mongoose.c 174 KB

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  1. // Copyright (c) 2004-2013 Sergey Lyubka
  2. //
  3. // Permission is hereby granted, free of charge, to any person obtaining a copy
  4. // of this software and associated documentation files (the "Software"), to deal
  5. // in the Software without restriction, including without limitation the rights
  6. // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  7. // copies of the Software, and to permit persons to whom the Software is
  8. // furnished to do so, subject to the following conditions:
  9. //
  10. // The above copyright notice and this permission notice shall be included in
  11. // all copies or substantial portions of the Software.
  12. //
  13. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15. // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16. // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17. // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  18. // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  19. // THE SOFTWARE.
  20. #if defined(_WIN32)
  21. #if !defined(_CRT_SECURE_NO_WARNINGS)
  22. #define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
  23. #endif
  24. #else
  25. #ifdef __linux__
  26. #define _XOPEN_SOURCE 600 // For flockfile() on Linux
  27. #endif
  28. #define _LARGEFILE_SOURCE // Enable 64-bit file offsets
  29. #define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
  30. #define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
  31. #endif
  32. #if defined (_MSC_VER)
  33. // conditional expression is constant: introduced by FD_SET(..)
  34. #pragma warning (disable : 4127)
  35. // non-constant aggregate initializer: issued due to missing C99 support
  36. #pragma warning (disable : 4204)
  37. #endif
  38. // Disable WIN32_LEAN_AND_MEAN.
  39. // This makes windows.h always include winsock2.h
  40. #ifdef WIN32_LEAN_AND_MEAN
  41. #undef WIN32_LEAN_AND_MEAN
  42. #endif
  43. #if defined(__SYMBIAN32__)
  44. #define NO_SSL // SSL is not supported
  45. #define NO_CGI // CGI is not supported
  46. #define PATH_MAX FILENAME_MAX
  47. #endif // __SYMBIAN32__
  48. #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
  49. #include <sys/types.h>
  50. #include <sys/stat.h>
  51. #include <errno.h>
  52. #include <signal.h>
  53. #include <fcntl.h>
  54. #endif // !_WIN32_WCE
  55. #include <time.h>
  56. #include <stdlib.h>
  57. #include <stdarg.h>
  58. #include <assert.h>
  59. #include <string.h>
  60. #include <ctype.h>
  61. #include <limits.h>
  62. #include <stddef.h>
  63. #include <stdio.h>
  64. #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
  65. #undef _WIN32_WINNT
  66. #define _WIN32_WINNT 0x0400 // To make it link in VS2005
  67. #include <windows.h>
  68. #ifndef PATH_MAX
  69. #define PATH_MAX MAX_PATH
  70. #endif
  71. #ifndef _WIN32_WCE
  72. #include <process.h>
  73. #include <direct.h>
  74. #include <io.h>
  75. #else // _WIN32_WCE
  76. #define NO_CGI // WinCE has no pipes
  77. typedef long off_t;
  78. #define errno GetLastError()
  79. #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
  80. #endif // _WIN32_WCE
  81. #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
  82. ((uint64_t)((uint32_t)(hi))) << 32))
  83. #define RATE_DIFF 10000000 // 100 nsecs
  84. #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
  85. #define SYS2UNIX_TIME(lo, hi) \
  86. (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
  87. // Visual Studio 6 does not know __func__ or __FUNCTION__
  88. // The rest of MS compilers use __FUNCTION__, not C99 __func__
  89. // Also use _strtoui64 on modern M$ compilers
  90. #if defined(_MSC_VER) && _MSC_VER < 1300
  91. #define STRX(x) #x
  92. #define STR(x) STRX(x)
  93. #define __func__ __FILE__ ":" STR(__LINE__)
  94. #define strtoull(x, y, z) (unsigned __int64) _atoi64(x)
  95. #define strtoll(x, y, z) _atoi64(x)
  96. #else
  97. #define __func__ __FUNCTION__
  98. #define strtoull(x, y, z) _strtoui64(x, y, z)
  99. #define strtoll(x, y, z) _strtoi64(x, y, z)
  100. #endif // _MSC_VER
  101. #define ERRNO GetLastError()
  102. #define NO_SOCKLEN_T
  103. #define SSL_LIB "ssleay32.dll"
  104. #define CRYPTO_LIB "libeay32.dll"
  105. #define O_NONBLOCK 0
  106. #if !defined(EWOULDBLOCK)
  107. #define EWOULDBLOCK WSAEWOULDBLOCK
  108. #endif // !EWOULDBLOCK
  109. #define _POSIX_
  110. #define INT64_FMT "I64d"
  111. #define WINCDECL __cdecl
  112. #define SHUT_WR 1
  113. #define snprintf _snprintf
  114. #define vsnprintf _vsnprintf
  115. #define mg_sleep(x) Sleep(x)
  116. #define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
  117. #ifndef popen
  118. #define popen(x, y) _popen(x, y)
  119. #endif
  120. #ifndef pclose
  121. #define pclose(x) _pclose(x)
  122. #endif
  123. #define close(x) _close(x)
  124. #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
  125. #define RTLD_LAZY 0
  126. #define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
  127. #define fdopen(x, y) _fdopen((x), (y))
  128. #define write(x, y, z) _write((x), (y), (unsigned) z)
  129. #define read(x, y, z) _read((x), (y), (unsigned) z)
  130. #define flockfile(x) EnterCriticalSection(&global_log_file_lock)
  131. #define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
  132. #define sleep(x) Sleep((x) * 1000)
  133. #define rmdir(x) _rmdir(x)
  134. #if !defined(va_copy)
  135. #define va_copy(x, y) x = y
  136. #endif // !va_copy MINGW #defines va_copy
  137. #if !defined(fileno)
  138. #define fileno(x) _fileno(x)
  139. #endif // !fileno MINGW #defines fileno
  140. typedef HANDLE pthread_mutex_t;
  141. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  142. typedef DWORD pthread_t;
  143. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  144. static int pthread_mutex_lock(pthread_mutex_t *);
  145. static int pthread_mutex_unlock(pthread_mutex_t *);
  146. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
  147. struct file;
  148. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
  149. #if defined(HAVE_STDINT)
  150. #include <stdint.h>
  151. #else
  152. typedef unsigned int uint32_t;
  153. typedef unsigned short uint16_t;
  154. typedef unsigned __int64 uint64_t;
  155. typedef __int64 int64_t;
  156. #define INT64_MAX 9223372036854775807
  157. #endif // HAVE_STDINT
  158. // POSIX dirent interface
  159. struct dirent {
  160. char d_name[PATH_MAX];
  161. };
  162. typedef struct DIR {
  163. HANDLE handle;
  164. WIN32_FIND_DATAW info;
  165. struct dirent result;
  166. } DIR;
  167. #ifndef HAVE_POLL
  168. struct pollfd {
  169. SOCKET fd;
  170. short events;
  171. short revents;
  172. };
  173. #define POLLIN 1
  174. #endif
  175. // Mark required libraries
  176. #ifdef _MSC_VER
  177. #pragma comment(lib, "Ws2_32.lib")
  178. #endif
  179. #else // UNIX specific
  180. #include <sys/wait.h>
  181. #include <sys/socket.h>
  182. #include <sys/poll.h>
  183. #include <netinet/in.h>
  184. #include <arpa/inet.h>
  185. #include <sys/time.h>
  186. #include <stdint.h>
  187. #include <inttypes.h>
  188. #include <netdb.h>
  189. #include <pwd.h>
  190. #include <unistd.h>
  191. #include <dirent.h>
  192. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  193. #include <dlfcn.h>
  194. #endif
  195. #include <pthread.h>
  196. #if defined(__MACH__)
  197. #define SSL_LIB "libssl.dylib"
  198. #define CRYPTO_LIB "libcrypto.dylib"
  199. #else
  200. #if !defined(SSL_LIB)
  201. #define SSL_LIB "libssl.so"
  202. #endif
  203. #if !defined(CRYPTO_LIB)
  204. #define CRYPTO_LIB "libcrypto.so"
  205. #endif
  206. #endif
  207. #ifndef O_BINARY
  208. #define O_BINARY 0
  209. #endif // O_BINARY
  210. #define closesocket(a) close(a)
  211. #define mg_mkdir(x, y) mkdir(x, y)
  212. #define mg_remove(x) remove(x)
  213. #define mg_sleep(x) usleep((x) * 1000)
  214. #define ERRNO errno
  215. #define INVALID_SOCKET (-1)
  216. #define INT64_FMT PRId64
  217. typedef int SOCKET;
  218. #define WINCDECL
  219. #endif // End of Windows and UNIX specific includes
  220. #include "mongoose.h"
  221. #define MONGOOSE_VERSION "3.9"
  222. #define PASSWORDS_FILE_NAME ".htpasswd"
  223. #define CGI_ENVIRONMENT_SIZE 4096
  224. #define MAX_CGI_ENVIR_VARS 64
  225. #define MG_BUF_LEN 8192
  226. #define MAX_REQUEST_SIZE 16384
  227. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  228. #ifdef _WIN32
  229. static CRITICAL_SECTION global_log_file_lock;
  230. static pthread_t pthread_self(void) {
  231. return GetCurrentThreadId();
  232. }
  233. #endif // _WIN32
  234. #ifdef DEBUG_TRACE
  235. #undef DEBUG_TRACE
  236. #define DEBUG_TRACE(x)
  237. #else
  238. #if defined(DEBUG)
  239. #define DEBUG_TRACE(x) do { \
  240. flockfile(stdout); \
  241. printf("*** %lu.%p.%s.%d: ", \
  242. (unsigned long) time(NULL), (void *) pthread_self(), \
  243. __func__, __LINE__); \
  244. printf x; \
  245. putchar('\n'); \
  246. fflush(stdout); \
  247. funlockfile(stdout); \
  248. } while (0)
  249. #else
  250. #define DEBUG_TRACE(x)
  251. #endif // DEBUG
  252. #endif // DEBUG_TRACE
  253. // Darwin prior to 7.0 and Win32 do not have socklen_t
  254. #ifdef NO_SOCKLEN_T
  255. typedef int socklen_t;
  256. #endif // NO_SOCKLEN_T
  257. #define _DARWIN_UNLIMITED_SELECT
  258. #define IP_ADDR_STR_LEN 50 // IPv6 hex string is 46 chars
  259. #if !defined(MSG_NOSIGNAL)
  260. #define MSG_NOSIGNAL 0
  261. #endif
  262. #if !defined(SOMAXCONN)
  263. #define SOMAXCONN 100
  264. #endif
  265. #if !defined(PATH_MAX)
  266. #define PATH_MAX 4096
  267. #endif
  268. // Size of the accepted socket queue
  269. #if !defined(MGSQLEN)
  270. #define MGSQLEN 20
  271. #endif
  272. static const char *http_500_error = "Internal Server Error";
  273. #if defined(NO_SSL_DL)
  274. #include <openssl/ssl.h>
  275. #include <openssl/err.h>
  276. #else
  277. // SSL loaded dynamically from DLL.
  278. // I put the prototypes here to be independent from OpenSSL source installation.
  279. typedef struct ssl_st SSL;
  280. typedef struct ssl_method_st SSL_METHOD;
  281. typedef struct ssl_ctx_st SSL_CTX;
  282. struct ssl_func {
  283. const char *name; // SSL function name
  284. void (*ptr)(void); // Function pointer
  285. };
  286. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  287. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  288. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  289. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  290. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  291. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  292. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  293. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  294. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  295. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  296. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  297. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  298. const char *, int)) ssl_sw[11].ptr)
  299. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  300. const char *, int)) ssl_sw[12].ptr)
  301. #define SSL_CTX_set_default_passwd_cb \
  302. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  303. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  304. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  305. #define SSL_CTX_use_certificate_chain_file \
  306. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  307. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  308. #define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
  309. #define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
  310. #define SSL_shutdown (* (int (*)(SSL *)) ssl_sw[20].ptr)
  311. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  312. #define CRYPTO_set_locking_callback \
  313. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  314. #define CRYPTO_set_id_callback \
  315. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  316. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  317. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  318. // set_ssl_option() function updates this array.
  319. // It loads SSL library dynamically and changes NULLs to the actual addresses
  320. // of respective functions. The macros above (like SSL_connect()) are really
  321. // just calling these functions indirectly via the pointer.
  322. static struct ssl_func ssl_sw[] = {
  323. {"SSL_free", NULL},
  324. {"SSL_accept", NULL},
  325. {"SSL_connect", NULL},
  326. {"SSL_read", NULL},
  327. {"SSL_write", NULL},
  328. {"SSL_get_error", NULL},
  329. {"SSL_set_fd", NULL},
  330. {"SSL_new", NULL},
  331. {"SSL_CTX_new", NULL},
  332. {"SSLv23_server_method", NULL},
  333. {"SSL_library_init", NULL},
  334. {"SSL_CTX_use_PrivateKey_file", NULL},
  335. {"SSL_CTX_use_certificate_file",NULL},
  336. {"SSL_CTX_set_default_passwd_cb",NULL},
  337. {"SSL_CTX_free", NULL},
  338. {"SSL_load_error_strings", NULL},
  339. {"SSL_CTX_use_certificate_chain_file", NULL},
  340. {"SSLv23_client_method", NULL},
  341. {"SSL_pending", NULL},
  342. {"SSL_CTX_set_verify", NULL},
  343. {"SSL_shutdown", NULL},
  344. {NULL, NULL}
  345. };
  346. // Similar array as ssl_sw. These functions could be located in different lib.
  347. #if !defined(NO_SSL)
  348. static struct ssl_func crypto_sw[] = {
  349. {"CRYPTO_num_locks", NULL},
  350. {"CRYPTO_set_locking_callback", NULL},
  351. {"CRYPTO_set_id_callback", NULL},
  352. {"ERR_get_error", NULL},
  353. {"ERR_error_string", NULL},
  354. {NULL, NULL}
  355. };
  356. #endif // NO_SSL
  357. #endif // NO_SSL_DL
  358. static const char *month_names[] = {
  359. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  360. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  361. };
  362. // Unified socket address. For IPv6 support, add IPv6 address structure
  363. // in the union u.
  364. union usa {
  365. struct sockaddr sa;
  366. struct sockaddr_in sin;
  367. #if defined(USE_IPV6)
  368. struct sockaddr_in6 sin6;
  369. #endif
  370. };
  371. // Describes a string (chunk of memory).
  372. struct vec {
  373. const char *ptr;
  374. size_t len;
  375. };
  376. struct file {
  377. int is_directory;
  378. time_t modification_time;
  379. int64_t size;
  380. FILE *fp;
  381. const char *membuf; // Non-NULL if file data is in memory
  382. // set to 1 if the content is gzipped
  383. // in which case we need a content-encoding: gzip header
  384. int gzipped;
  385. };
  386. #define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL, 0}
  387. // Describes listening socket, or socket which was accept()-ed by the master
  388. // thread and queued for future handling by the worker thread.
  389. struct socket {
  390. SOCKET sock; // Listening socket
  391. union usa lsa; // Local socket address
  392. union usa rsa; // Remote socket address
  393. unsigned is_ssl:1; // Is port SSL-ed
  394. unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
  395. };
  396. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  397. enum {
  398. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  399. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  400. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  401. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  402. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  403. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
  404. NUM_OPTIONS
  405. };
  406. static const char *config_options[] = {
  407. "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  408. "cgi_environment", NULL,
  409. "put_delete_auth_file", NULL,
  410. "cgi_interpreter", NULL,
  411. "protect_uri", NULL,
  412. "authentication_domain", "mydomain.com",
  413. "ssi_pattern", "**.shtml$|**.shtm$",
  414. "throttle", NULL,
  415. "access_log_file", NULL,
  416. "enable_directory_listing", "yes",
  417. "error_log_file", NULL,
  418. "global_auth_file", NULL,
  419. "index_files",
  420. "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
  421. "enable_keep_alive", "no",
  422. "access_control_list", NULL,
  423. "extra_mime_types", NULL,
  424. "listening_ports", "8080",
  425. "document_root", NULL,
  426. "ssl_certificate", NULL,
  427. "num_threads", "50",
  428. "run_as_user", NULL,
  429. "url_rewrite_patterns", NULL,
  430. "hide_files_patterns", NULL,
  431. "request_timeout_ms", "30000",
  432. NULL
  433. };
  434. struct mg_context {
  435. volatile int stop_flag; // Should we stop event loop
  436. SSL_CTX *ssl_ctx; // SSL context
  437. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  438. struct mg_callbacks callbacks; // User-defined callback function
  439. void *user_data; // User-defined data
  440. struct socket *listening_sockets;
  441. int num_listening_sockets;
  442. volatile int num_threads; // Number of threads
  443. pthread_mutex_t mutex; // Protects (max|num)_threads
  444. pthread_cond_t cond; // Condvar for tracking workers terminations
  445. struct socket queue[MGSQLEN]; // Accepted sockets
  446. volatile int sq_head; // Head of the socket queue
  447. volatile int sq_tail; // Tail of the socket queue
  448. pthread_cond_t sq_full; // Signaled when socket is produced
  449. pthread_cond_t sq_empty; // Signaled when socket is consumed
  450. };
  451. struct mg_connection {
  452. struct mg_request_info request_info;
  453. struct mg_context *ctx;
  454. SSL *ssl; // SSL descriptor
  455. SSL_CTX *client_ssl_ctx; // SSL context for client connections
  456. struct socket client; // Connected client
  457. time_t birth_time; // Time when request was received
  458. int64_t num_bytes_sent; // Total bytes sent to client
  459. int64_t content_len; // Content-Length header value
  460. int64_t consumed_content; // How many bytes of content have been read
  461. char *buf; // Buffer for received data
  462. char *path_info; // PATH_INFO part of the URL
  463. int must_close; // 1 if connection must be closed
  464. int buf_size; // Buffer size
  465. int request_len; // Size of the request + headers in a buffer
  466. int data_len; // Total size of data in a buffer
  467. int status_code; // HTTP reply status code, e.g. 200
  468. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  469. time_t last_throttle_time; // Last time throttled data was sent
  470. int64_t last_throttle_bytes;// Bytes sent this second
  471. };
  472. // Directory entry
  473. struct de {
  474. struct mg_connection *conn;
  475. char *file_name;
  476. struct file file;
  477. };
  478. const char **mg_get_valid_option_names(void) {
  479. return config_options;
  480. }
  481. static int is_file_in_memory(struct mg_connection *conn, const char *path,
  482. struct file *filep) {
  483. size_t size = 0;
  484. if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
  485. conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
  486. // NOTE: override filep->size only on success. Otherwise, it might break
  487. // constructs like if (!mg_stat() || !mg_fopen()) ...
  488. filep->size = size;
  489. }
  490. return filep->membuf != NULL;
  491. }
  492. static int is_file_opened(const struct file *filep) {
  493. return filep->membuf != NULL || filep->fp != NULL;
  494. }
  495. static int mg_fopen(struct mg_connection *conn, const char *path,
  496. const char *mode, struct file *filep) {
  497. if (!is_file_in_memory(conn, path, filep)) {
  498. #ifdef _WIN32
  499. wchar_t wbuf[PATH_MAX], wmode[20];
  500. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  501. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  502. filep->fp = _wfopen(wbuf, wmode);
  503. #else
  504. filep->fp = fopen(path, mode);
  505. #endif
  506. }
  507. return is_file_opened(filep);
  508. }
  509. static void mg_fclose(struct file *filep) {
  510. if (filep != NULL && filep->fp != NULL) {
  511. fclose(filep->fp);
  512. }
  513. }
  514. static int get_option_index(const char *name) {
  515. int i;
  516. for (i = 0; config_options[i * 2] != NULL; i++) {
  517. if (strcmp(config_options[i * 2], name) == 0) {
  518. return i;
  519. }
  520. }
  521. return -1;
  522. }
  523. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  524. int i;
  525. if ((i = get_option_index(name)) == -1) {
  526. return NULL;
  527. } else if (ctx->config[i] == NULL) {
  528. return "";
  529. } else {
  530. return ctx->config[i];
  531. }
  532. }
  533. static void sockaddr_to_string(char *buf, size_t len,
  534. const union usa *usa) {
  535. buf[0] = '\0';
  536. #if defined(USE_IPV6)
  537. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  538. (void *) &usa->sin.sin_addr :
  539. (void *) &usa->sin6.sin6_addr, buf, len);
  540. #elif defined(_WIN32)
  541. // Only Windoze Vista (and newer) have inet_ntop()
  542. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  543. #else
  544. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  545. #endif
  546. }
  547. static void cry(struct mg_connection *conn,
  548. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  549. // Print error message to the opened error log stream.
  550. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  551. char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN];
  552. va_list ap;
  553. FILE *fp;
  554. time_t timestamp;
  555. va_start(ap, fmt);
  556. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  557. va_end(ap);
  558. // Do not lock when getting the callback value, here and below.
  559. // I suppose this is fine, since function cannot disappear in the
  560. // same way string option can.
  561. if (conn->ctx->callbacks.log_message == NULL ||
  562. conn->ctx->callbacks.log_message(conn, buf) == 0) {
  563. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  564. fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  565. if (fp != NULL) {
  566. flockfile(fp);
  567. timestamp = time(NULL);
  568. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  569. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  570. src_addr);
  571. if (conn->request_info.request_method != NULL) {
  572. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  573. conn->request_info.uri);
  574. }
  575. fprintf(fp, "%s", buf);
  576. fputc('\n', fp);
  577. funlockfile(fp);
  578. fclose(fp);
  579. }
  580. }
  581. }
  582. // Return fake connection structure. Used for logging, if connection
  583. // is not applicable at the moment of logging.
  584. static struct mg_connection *fc(struct mg_context *ctx) {
  585. static struct mg_connection fake_connection;
  586. fake_connection.ctx = ctx;
  587. return &fake_connection;
  588. }
  589. const char *mg_version(void) {
  590. return MONGOOSE_VERSION;
  591. }
  592. struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
  593. return &conn->request_info;
  594. }
  595. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  596. for (; *src != '\0' && n > 1; n--) {
  597. *dst++ = *src++;
  598. }
  599. *dst = '\0';
  600. }
  601. static int lowercase(const char *s) {
  602. return tolower(* (const unsigned char *) s);
  603. }
  604. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  605. int diff = 0;
  606. if (len > 0)
  607. do {
  608. diff = lowercase(s1++) - lowercase(s2++);
  609. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  610. return diff;
  611. }
  612. static int mg_strcasecmp(const char *s1, const char *s2) {
  613. int diff;
  614. do {
  615. diff = lowercase(s1++) - lowercase(s2++);
  616. } while (diff == 0 && s1[-1] != '\0');
  617. return diff;
  618. }
  619. static char * mg_strndup(const char *ptr, size_t len) {
  620. char *p;
  621. if ((p = (char *) malloc(len + 1)) != NULL) {
  622. mg_strlcpy(p, ptr, len + 1);
  623. }
  624. return p;
  625. }
  626. static char * mg_strdup(const char *str) {
  627. return mg_strndup(str, strlen(str));
  628. }
  629. static const char *mg_strcasestr(const char *big_str, const char *small_str) {
  630. int i, big_len = strlen(big_str), small_len = strlen(small_str);
  631. for (i = 0; i <= big_len - small_len; i++) {
  632. if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
  633. return big_str + i;
  634. }
  635. }
  636. return NULL;
  637. }
  638. // Like snprintf(), but never returns negative value, or a value
  639. // that is larger than a supplied buffer.
  640. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  641. // in his audit report.
  642. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  643. const char *fmt, va_list ap) {
  644. int n;
  645. if (buflen == 0)
  646. return 0;
  647. n = vsnprintf(buf, buflen, fmt, ap);
  648. if (n < 0) {
  649. cry(conn, "vsnprintf error");
  650. n = 0;
  651. } else if (n >= (int) buflen) {
  652. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  653. n > 200 ? 200 : n, buf);
  654. n = (int) buflen - 1;
  655. }
  656. buf[n] = '\0';
  657. return n;
  658. }
  659. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  660. PRINTF_FORMAT_STRING(const char *fmt), ...)
  661. PRINTF_ARGS(4, 5);
  662. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  663. const char *fmt, ...) {
  664. va_list ap;
  665. int n;
  666. va_start(ap, fmt);
  667. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  668. va_end(ap);
  669. return n;
  670. }
  671. // Skip the characters until one of the delimiters characters found.
  672. // 0-terminate resulting word. Skip the delimiter and following whitespaces.
  673. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  674. // Delimiters can be quoted with quotechar.
  675. static char *skip_quoted(char **buf, const char *delimiters,
  676. const char *whitespace, char quotechar) {
  677. char *p, *begin_word, *end_word, *end_whitespace;
  678. begin_word = *buf;
  679. end_word = begin_word + strcspn(begin_word, delimiters);
  680. // Check for quotechar
  681. if (end_word > begin_word) {
  682. p = end_word - 1;
  683. while (*p == quotechar) {
  684. // If there is anything beyond end_word, copy it
  685. if (*end_word == '\0') {
  686. *p = '\0';
  687. break;
  688. } else {
  689. size_t end_off = strcspn(end_word + 1, delimiters);
  690. memmove (p, end_word, end_off + 1);
  691. p += end_off; // p must correspond to end_word - 1
  692. end_word += end_off + 1;
  693. }
  694. }
  695. for (p++; p < end_word; p++) {
  696. *p = '\0';
  697. }
  698. }
  699. if (*end_word == '\0') {
  700. *buf = end_word;
  701. } else {
  702. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  703. for (p = end_word; p < end_whitespace; p++) {
  704. *p = '\0';
  705. }
  706. *buf = end_whitespace;
  707. }
  708. return begin_word;
  709. }
  710. // Simplified version of skip_quoted without quote char
  711. // and whitespace == delimiters
  712. static char *skip(char **buf, const char *delimiters) {
  713. return skip_quoted(buf, delimiters, delimiters, 0);
  714. }
  715. // Return HTTP header value, or NULL if not found.
  716. static const char *get_header(const struct mg_request_info *ri,
  717. const char *name) {
  718. int i;
  719. for (i = 0; i < ri->num_headers; i++)
  720. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  721. return ri->http_headers[i].value;
  722. return NULL;
  723. }
  724. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  725. return get_header(&conn->request_info, name);
  726. }
  727. // A helper function for traversing a comma separated list of values.
  728. // It returns a list pointer shifted to the next value, or NULL if the end
  729. // of the list found.
  730. // Value is stored in val vector. If value has form "x=y", then eq_val
  731. // vector is initialized to point to the "y" part, and val vector length
  732. // is adjusted to point only to "x".
  733. static const char *next_option(const char *list, struct vec *val,
  734. struct vec *eq_val) {
  735. if (list == NULL || *list == '\0') {
  736. // End of the list
  737. list = NULL;
  738. } else {
  739. val->ptr = list;
  740. if ((list = strchr(val->ptr, ',')) != NULL) {
  741. // Comma found. Store length and shift the list ptr
  742. val->len = list - val->ptr;
  743. list++;
  744. } else {
  745. // This value is the last one
  746. list = val->ptr + strlen(val->ptr);
  747. val->len = list - val->ptr;
  748. }
  749. if (eq_val != NULL) {
  750. // Value has form "x=y", adjust pointers and lengths
  751. // so that val points to "x", and eq_val points to "y".
  752. eq_val->len = 0;
  753. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  754. if (eq_val->ptr != NULL) {
  755. eq_val->ptr++; // Skip over '=' character
  756. eq_val->len = val->ptr + val->len - eq_val->ptr;
  757. val->len = (eq_val->ptr - val->ptr) - 1;
  758. }
  759. }
  760. }
  761. return list;
  762. }
  763. // Perform case-insensitive match of string against pattern
  764. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  765. const char *or_str;
  766. int i, j, len, res;
  767. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  768. res = match_prefix(pattern, or_str - pattern, str);
  769. return res > 0 ? res :
  770. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  771. }
  772. i = j = 0;
  773. res = -1;
  774. for (; i < pattern_len; i++, j++) {
  775. if (pattern[i] == '?' && str[j] != '\0') {
  776. continue;
  777. } else if (pattern[i] == '$') {
  778. return str[j] == '\0' ? j : -1;
  779. } else if (pattern[i] == '*') {
  780. i++;
  781. if (pattern[i] == '*') {
  782. i++;
  783. len = (int) strlen(str + j);
  784. } else {
  785. len = (int) strcspn(str + j, "/");
  786. }
  787. if (i == pattern_len) {
  788. return j + len;
  789. }
  790. do {
  791. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  792. } while (res == -1 && len-- > 0);
  793. return res == -1 ? -1 : j + res + len;
  794. } else if (lowercase(&pattern[i]) != lowercase(&str[j])) {
  795. return -1;
  796. }
  797. }
  798. return j;
  799. }
  800. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  801. // This function must tolerate situations when connection info is not
  802. // set up, for example if request parsing failed.
  803. static int should_keep_alive(const struct mg_connection *conn) {
  804. const char *http_version = conn->request_info.http_version;
  805. const char *header = mg_get_header(conn, "Connection");
  806. if (conn->must_close ||
  807. conn->status_code == 401 ||
  808. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  809. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  810. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  811. return 0;
  812. }
  813. return 1;
  814. }
  815. static const char *suggest_connection_header(const struct mg_connection *conn) {
  816. return should_keep_alive(conn) ? "keep-alive" : "close";
  817. }
  818. static void send_http_error(struct mg_connection *, int, const char *,
  819. PRINTF_FORMAT_STRING(const char *fmt), ...)
  820. PRINTF_ARGS(4, 5);
  821. static void send_http_error(struct mg_connection *conn, int status,
  822. const char *reason, const char *fmt, ...) {
  823. char buf[MG_BUF_LEN];
  824. va_list ap;
  825. int len = 0;
  826. conn->status_code = status;
  827. if (conn->ctx->callbacks.http_error == NULL ||
  828. conn->ctx->callbacks.http_error(conn, status)) {
  829. buf[0] = '\0';
  830. // Errors 1xx, 204 and 304 MUST NOT send a body
  831. if (status > 199 && status != 204 && status != 304) {
  832. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  833. buf[len++] = '\n';
  834. va_start(ap, fmt);
  835. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  836. va_end(ap);
  837. }
  838. DEBUG_TRACE(("[%s]", buf));
  839. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  840. "Content-Length: %d\r\n"
  841. "Connection: %s\r\n\r\n", status, reason, len,
  842. suggest_connection_header(conn));
  843. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  844. }
  845. }
  846. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  847. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  848. (void) unused;
  849. *mutex = CreateMutex(NULL, FALSE, NULL);
  850. return *mutex == NULL ? -1 : 0;
  851. }
  852. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  853. return CloseHandle(*mutex) == 0 ? -1 : 0;
  854. }
  855. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  856. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  857. }
  858. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  859. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  860. }
  861. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  862. (void) unused;
  863. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  864. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  865. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  866. }
  867. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  868. HANDLE handles[] = {cv->signal, cv->broadcast};
  869. ReleaseMutex(*mutex);
  870. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  871. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  872. }
  873. static int pthread_cond_signal(pthread_cond_t *cv) {
  874. return SetEvent(cv->signal) == 0 ? -1 : 0;
  875. }
  876. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  877. // Implementation with PulseEvent() has race condition, see
  878. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  879. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  880. }
  881. static int pthread_cond_destroy(pthread_cond_t *cv) {
  882. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  883. }
  884. // For Windows, change all slashes to backslashes in path names.
  885. static void change_slashes_to_backslashes(char *path) {
  886. int i;
  887. for (i = 0; path[i] != '\0'; i++) {
  888. if (path[i] == '/')
  889. path[i] = '\\';
  890. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  891. if (path[i] == '\\' && i > 0)
  892. while (path[i + 1] == '\\' || path[i + 1] == '/')
  893. (void) memmove(path + i + 1,
  894. path + i + 2, strlen(path + i + 1));
  895. }
  896. }
  897. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  898. // wbuf and wbuf_len is a target buffer and its length.
  899. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  900. char buf[PATH_MAX], buf2[PATH_MAX];
  901. mg_strlcpy(buf, path, sizeof(buf));
  902. change_slashes_to_backslashes(buf);
  903. // Convert to Unicode and back. If doubly-converted string does not
  904. // match the original, something is fishy, reject.
  905. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  906. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  907. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  908. NULL, NULL);
  909. if (strcmp(buf, buf2) != 0) {
  910. wbuf[0] = L'\0';
  911. }
  912. }
  913. #if defined(_WIN32_WCE)
  914. static time_t time(time_t *ptime) {
  915. time_t t;
  916. SYSTEMTIME st;
  917. FILETIME ft;
  918. GetSystemTime(&st);
  919. SystemTimeToFileTime(&st, &ft);
  920. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  921. if (ptime != NULL) {
  922. *ptime = t;
  923. }
  924. return t;
  925. }
  926. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  927. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  928. FILETIME ft, lft;
  929. SYSTEMTIME st;
  930. TIME_ZONE_INFORMATION tzinfo;
  931. if (ptm == NULL) {
  932. return NULL;
  933. }
  934. * (int64_t *) &ft = t;
  935. FileTimeToLocalFileTime(&ft, &lft);
  936. FileTimeToSystemTime(&lft, &st);
  937. ptm->tm_year = st.wYear - 1900;
  938. ptm->tm_mon = st.wMonth - 1;
  939. ptm->tm_wday = st.wDayOfWeek;
  940. ptm->tm_mday = st.wDay;
  941. ptm->tm_hour = st.wHour;
  942. ptm->tm_min = st.wMinute;
  943. ptm->tm_sec = st.wSecond;
  944. ptm->tm_yday = 0; // hope nobody uses this
  945. ptm->tm_isdst =
  946. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  947. return ptm;
  948. }
  949. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  950. // FIXME(lsm): fix this.
  951. return localtime(ptime, ptm);
  952. }
  953. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  954. const struct tm *tm) {
  955. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  956. return 0;
  957. }
  958. #endif
  959. // Windows happily opens files with some garbage at the end of file name.
  960. // For example, fopen("a.cgi ", "r") on Windows successfully opens
  961. // "a.cgi", despite one would expect an error back.
  962. // This function returns non-0 if path ends with some garbage.
  963. static int path_cannot_disclose_cgi(const char *path) {
  964. static const char *allowed_last_characters = "_-";
  965. int last = path[strlen(path) - 1];
  966. return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
  967. }
  968. static int mg_stat(struct mg_connection *conn, const char *path,
  969. struct file *filep) {
  970. wchar_t wbuf[PATH_MAX];
  971. WIN32_FILE_ATTRIBUTE_DATA info;
  972. if (!is_file_in_memory(conn, path, filep)) {
  973. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  974. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  975. filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  976. filep->modification_time = SYS2UNIX_TIME(
  977. info.ftLastWriteTime.dwLowDateTime,
  978. info.ftLastWriteTime.dwHighDateTime);
  979. filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  980. // If file name is fishy, reset the file structure and return error.
  981. // Note it is important to reset, not just return the error, cause
  982. // functions like is_file_opened() check the struct.
  983. if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
  984. memset(filep, 0, sizeof(*filep));
  985. }
  986. }
  987. }
  988. return filep->membuf != NULL || filep->modification_time != 0;
  989. }
  990. static int mg_remove(const char *path) {
  991. wchar_t wbuf[PATH_MAX];
  992. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  993. return DeleteFileW(wbuf) ? 0 : -1;
  994. }
  995. static int mg_mkdir(const char *path, int mode) {
  996. char buf[PATH_MAX];
  997. wchar_t wbuf[PATH_MAX];
  998. (void) mode;
  999. mg_strlcpy(buf, path, sizeof(buf));
  1000. change_slashes_to_backslashes(buf);
  1001. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
  1002. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  1003. }
  1004. // Implementation of POSIX opendir/closedir/readdir for Windows.
  1005. static DIR * opendir(const char *name) {
  1006. DIR *dir = NULL;
  1007. wchar_t wpath[PATH_MAX];
  1008. DWORD attrs;
  1009. if (name == NULL) {
  1010. SetLastError(ERROR_BAD_ARGUMENTS);
  1011. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  1012. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  1013. } else {
  1014. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  1015. attrs = GetFileAttributesW(wpath);
  1016. if (attrs != 0xFFFFFFFF &&
  1017. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  1018. (void) wcscat(wpath, L"\\*");
  1019. dir->handle = FindFirstFileW(wpath, &dir->info);
  1020. dir->result.d_name[0] = '\0';
  1021. } else {
  1022. free(dir);
  1023. dir = NULL;
  1024. }
  1025. }
  1026. return dir;
  1027. }
  1028. static int closedir(DIR *dir) {
  1029. int result = 0;
  1030. if (dir != NULL) {
  1031. if (dir->handle != INVALID_HANDLE_VALUE)
  1032. result = FindClose(dir->handle) ? 0 : -1;
  1033. free(dir);
  1034. } else {
  1035. result = -1;
  1036. SetLastError(ERROR_BAD_ARGUMENTS);
  1037. }
  1038. return result;
  1039. }
  1040. static struct dirent *readdir(DIR *dir) {
  1041. struct dirent *result = 0;
  1042. if (dir) {
  1043. if (dir->handle != INVALID_HANDLE_VALUE) {
  1044. result = &dir->result;
  1045. (void) WideCharToMultiByte(CP_UTF8, 0,
  1046. dir->info.cFileName, -1, result->d_name,
  1047. sizeof(result->d_name), NULL, NULL);
  1048. if (!FindNextFileW(dir->handle, &dir->info)) {
  1049. (void) FindClose(dir->handle);
  1050. dir->handle = INVALID_HANDLE_VALUE;
  1051. }
  1052. } else {
  1053. SetLastError(ERROR_FILE_NOT_FOUND);
  1054. }
  1055. } else {
  1056. SetLastError(ERROR_BAD_ARGUMENTS);
  1057. }
  1058. return result;
  1059. }
  1060. #ifndef HAVE_POLL
  1061. static int poll(struct pollfd *pfd, int n, int milliseconds) {
  1062. struct timeval tv;
  1063. fd_set set;
  1064. int i, result;
  1065. SOCKET maxfd = 0;
  1066. tv.tv_sec = milliseconds / 1000;
  1067. tv.tv_usec = (milliseconds % 1000) * 1000;
  1068. FD_ZERO(&set);
  1069. for (i = 0; i < n; i++) {
  1070. FD_SET((SOCKET) pfd[i].fd, &set);
  1071. pfd[i].revents = 0;
  1072. if (pfd[i].fd > maxfd) {
  1073. maxfd = pfd[i].fd;
  1074. }
  1075. }
  1076. if ((result = select(maxfd + 1, &set, NULL, NULL, &tv)) > 0) {
  1077. for (i = 0; i < n; i++) {
  1078. if (FD_ISSET(pfd[i].fd, &set)) {
  1079. pfd[i].revents = POLLIN;
  1080. }
  1081. }
  1082. }
  1083. return result;
  1084. }
  1085. #endif // HAVE_POLL
  1086. static void set_close_on_exec(SOCKET sock) {
  1087. (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
  1088. }
  1089. int mg_start_thread(mg_thread_func_t f, void *p) {
  1090. return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1091. }
  1092. static HANDLE dlopen(const char *dll_name, int flags) {
  1093. wchar_t wbuf[PATH_MAX];
  1094. (void) flags;
  1095. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1096. return LoadLibraryW(wbuf);
  1097. }
  1098. #if !defined(NO_CGI)
  1099. #define SIGKILL 0
  1100. static int kill(pid_t pid, int sig_num) {
  1101. (void) TerminateProcess(pid, sig_num);
  1102. (void) CloseHandle(pid);
  1103. return 0;
  1104. }
  1105. static void trim_trailing_whitespaces(char *s) {
  1106. char *e = s + strlen(s) - 1;
  1107. while (e > s && isspace(* (unsigned char *) e)) {
  1108. *e-- = '\0';
  1109. }
  1110. }
  1111. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1112. char *envblk, char *envp[], int fdin,
  1113. int fdout, const char *dir) {
  1114. HANDLE me;
  1115. char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
  1116. cmdline[PATH_MAX], buf[PATH_MAX];
  1117. struct file file = STRUCT_FILE_INITIALIZER;
  1118. STARTUPINFOA si;
  1119. PROCESS_INFORMATION pi = { 0 };
  1120. (void) envp;
  1121. memset(&si, 0, sizeof(si));
  1122. si.cb = sizeof(si);
  1123. // TODO(lsm): redirect CGI errors to the error log file
  1124. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1125. si.wShowWindow = SW_HIDE;
  1126. me = GetCurrentProcess();
  1127. DuplicateHandle(me, (HANDLE) _get_osfhandle(fdin), me,
  1128. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1129. DuplicateHandle(me, (HANDLE) _get_osfhandle(fdout), me,
  1130. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1131. // If CGI file is a script, try to read the interpreter line
  1132. interp = conn->ctx->config[CGI_INTERPRETER];
  1133. if (interp == NULL) {
  1134. buf[0] = buf[1] = '\0';
  1135. // Read the first line of the script into the buffer
  1136. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1137. if (mg_fopen(conn, cmdline, "r", &file)) {
  1138. p = (char *) file.membuf;
  1139. mg_fgets(buf, sizeof(buf), &file, &p);
  1140. mg_fclose(&file);
  1141. buf[sizeof(buf) - 1] = '\0';
  1142. }
  1143. if (buf[0] == '#' && buf[1] == '!') {
  1144. trim_trailing_whitespaces(buf + 2);
  1145. } else {
  1146. buf[2] = '\0';
  1147. }
  1148. interp = buf + 2;
  1149. }
  1150. if (interp[0] != '\0') {
  1151. GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
  1152. interp = full_interp;
  1153. }
  1154. GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
  1155. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s\"%s\\%s\"",
  1156. interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
  1157. DEBUG_TRACE(("Running [%s]", cmdline));
  1158. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1159. CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
  1160. cry(conn, "%s: CreateProcess(%s): %ld",
  1161. __func__, cmdline, ERRNO);
  1162. pi.hProcess = (pid_t) -1;
  1163. }
  1164. (void) CloseHandle(si.hStdOutput);
  1165. (void) CloseHandle(si.hStdInput);
  1166. (void) CloseHandle(pi.hThread);
  1167. return (pid_t) pi.hProcess;
  1168. }
  1169. #endif // !NO_CGI
  1170. static int set_non_blocking_mode(SOCKET sock) {
  1171. unsigned long on = 1;
  1172. return ioctlsocket(sock, FIONBIO, &on);
  1173. }
  1174. #else
  1175. static int mg_stat(struct mg_connection *conn, const char *path,
  1176. struct file *filep) {
  1177. struct stat st;
  1178. if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
  1179. filep->size = st.st_size;
  1180. filep->modification_time = st.st_mtime;
  1181. filep->is_directory = S_ISDIR(st.st_mode);
  1182. } else {
  1183. filep->modification_time = (time_t) 0;
  1184. }
  1185. return filep->membuf != NULL || filep->modification_time != (time_t) 0;
  1186. }
  1187. static void set_close_on_exec(int fd) {
  1188. fcntl(fd, F_SETFD, FD_CLOEXEC);
  1189. }
  1190. int mg_start_thread(mg_thread_func_t func, void *param) {
  1191. pthread_t thread_id;
  1192. pthread_attr_t attr;
  1193. int result;
  1194. (void) pthread_attr_init(&attr);
  1195. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1196. #if USE_STACK_SIZE > 1
  1197. // Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384
  1198. (void) pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
  1199. #endif
  1200. result = pthread_create(&thread_id, &attr, func, param);
  1201. pthread_attr_destroy(&attr);
  1202. return result;
  1203. }
  1204. #ifndef NO_CGI
  1205. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1206. char *envblk, char *envp[], int fdin,
  1207. int fdout, const char *dir) {
  1208. pid_t pid;
  1209. const char *interp;
  1210. (void) envblk;
  1211. if ((pid = fork()) == -1) {
  1212. // Parent
  1213. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1214. } else if (pid == 0) {
  1215. // Child
  1216. if (chdir(dir) != 0) {
  1217. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1218. } else if (dup2(fdin, 0) == -1) {
  1219. cry(conn, "%s: dup2(%d, 0): %s", __func__, fdin, strerror(ERRNO));
  1220. } else if (dup2(fdout, 1) == -1) {
  1221. cry(conn, "%s: dup2(%d, 1): %s", __func__, fdout, strerror(ERRNO));
  1222. } else {
  1223. // Not redirecting stderr to stdout, to avoid output being littered
  1224. // with the error messages.
  1225. (void) close(fdin);
  1226. (void) close(fdout);
  1227. // After exec, all signal handlers are restored to their default values,
  1228. // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
  1229. // implementation, SIGCHLD's handler will leave unchanged after exec
  1230. // if it was set to be ignored. Restore it to default action.
  1231. signal(SIGCHLD, SIG_DFL);
  1232. interp = conn->ctx->config[CGI_INTERPRETER];
  1233. if (interp == NULL) {
  1234. (void) execle(prog, prog, NULL, envp);
  1235. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1236. } else {
  1237. (void) execle(interp, interp, prog, NULL, envp);
  1238. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1239. strerror(ERRNO));
  1240. }
  1241. }
  1242. exit(EXIT_FAILURE);
  1243. }
  1244. return pid;
  1245. }
  1246. #endif // !NO_CGI
  1247. static int set_non_blocking_mode(SOCKET sock) {
  1248. int flags;
  1249. flags = fcntl(sock, F_GETFL, 0);
  1250. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1251. return 0;
  1252. }
  1253. #endif // _WIN32
  1254. // Write data to the IO channel - opened file descriptor, socket or SSL
  1255. // descriptor. Return number of bytes written.
  1256. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1257. int64_t len) {
  1258. int64_t sent;
  1259. int n, k;
  1260. (void) ssl; // Get rid of warning
  1261. sent = 0;
  1262. while (sent < len) {
  1263. // How many bytes we send in this iteration
  1264. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1265. #ifndef NO_SSL
  1266. if (ssl != NULL) {
  1267. n = SSL_write(ssl, buf + sent, k);
  1268. } else
  1269. #endif
  1270. if (fp != NULL) {
  1271. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1272. if (ferror(fp))
  1273. n = -1;
  1274. } else {
  1275. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1276. }
  1277. if (n <= 0)
  1278. break;
  1279. sent += n;
  1280. }
  1281. return sent;
  1282. }
  1283. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1284. // Return negative value on error, or number of bytes read on success.
  1285. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1286. int nread;
  1287. if (fp != NULL) {
  1288. // Use read() instead of fread(), because if we're reading from the CGI
  1289. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1290. // to block and must pass all read bytes immediately to the client.
  1291. nread = read(fileno(fp), buf, (size_t) len);
  1292. #ifndef NO_SSL
  1293. } else if (conn->ssl != NULL) {
  1294. nread = SSL_read(conn->ssl, buf, len);
  1295. #endif
  1296. } else {
  1297. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1298. }
  1299. return conn->ctx->stop_flag ? -1 : nread;
  1300. }
  1301. static int pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1302. int n, nread = 0;
  1303. while (len > 0 && conn->ctx->stop_flag == 0) {
  1304. n = pull(fp, conn, buf + nread, len);
  1305. if (n < 0) {
  1306. nread = n; // Propagate the error
  1307. break;
  1308. } else if (n == 0) {
  1309. break; // No more data to read
  1310. } else {
  1311. conn->consumed_content += n;
  1312. nread += n;
  1313. len -= n;
  1314. }
  1315. }
  1316. return nread;
  1317. }
  1318. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1319. int n, buffered_len, nread;
  1320. const char *body;
  1321. // If Content-Length is not set, read until socket is closed
  1322. if (conn->consumed_content == 0 && conn->content_len == 0) {
  1323. conn->content_len = INT64_MAX;
  1324. conn->must_close = 1;
  1325. }
  1326. nread = 0;
  1327. if (conn->consumed_content < conn->content_len) {
  1328. // Adjust number of bytes to read.
  1329. int64_t to_read = conn->content_len - conn->consumed_content;
  1330. if (to_read < (int64_t) len) {
  1331. len = (size_t) to_read;
  1332. }
  1333. // Return buffered data
  1334. body = conn->buf + conn->request_len + conn->consumed_content;
  1335. buffered_len = &conn->buf[conn->data_len] - body;
  1336. if (buffered_len > 0) {
  1337. if (len < (size_t) buffered_len) {
  1338. buffered_len = (int) len;
  1339. }
  1340. memcpy(buf, body, (size_t) buffered_len);
  1341. len -= buffered_len;
  1342. conn->consumed_content += buffered_len;
  1343. nread += buffered_len;
  1344. buf = (char *) buf + buffered_len;
  1345. }
  1346. // We have returned all buffered data. Read new data from the remote socket.
  1347. n = pull_all(NULL, conn, (char *) buf, (int) len);
  1348. nread = n >= 0 ? nread + n : n;
  1349. }
  1350. return nread;
  1351. }
  1352. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1353. time_t now;
  1354. int64_t n, total, allowed;
  1355. if (conn->throttle > 0) {
  1356. if ((now = time(NULL)) != conn->last_throttle_time) {
  1357. conn->last_throttle_time = now;
  1358. conn->last_throttle_bytes = 0;
  1359. }
  1360. allowed = conn->throttle - conn->last_throttle_bytes;
  1361. if (allowed > (int64_t) len) {
  1362. allowed = len;
  1363. }
  1364. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1365. (int64_t) allowed)) == allowed) {
  1366. buf = (char *) buf + total;
  1367. conn->last_throttle_bytes += total;
  1368. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1369. allowed = conn->throttle > (int64_t) len - total ?
  1370. (int64_t) len - total : conn->throttle;
  1371. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1372. (int64_t) allowed)) != allowed) {
  1373. break;
  1374. }
  1375. sleep(1);
  1376. conn->last_throttle_bytes = allowed;
  1377. conn->last_throttle_time = time(NULL);
  1378. buf = (char *) buf + n;
  1379. total += n;
  1380. }
  1381. }
  1382. } else {
  1383. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1384. (int64_t) len);
  1385. }
  1386. return (int) total;
  1387. }
  1388. // Alternative alloc_vprintf() for non-compliant C runtimes
  1389. static int alloc_vprintf2(char **buf, const char *fmt, va_list ap) {
  1390. va_list ap_copy;
  1391. int size = MG_BUF_LEN;
  1392. int len = -1;
  1393. *buf = NULL;
  1394. while (len == -1) {
  1395. if (*buf) free(*buf);
  1396. *buf = malloc(size *= 4);
  1397. if (!*buf) break;
  1398. va_copy(ap_copy, ap);
  1399. len = vsnprintf(*buf, size, fmt, ap_copy);
  1400. }
  1401. return len;
  1402. }
  1403. // Print message to buffer. If buffer is large enough to hold the message,
  1404. // return buffer. If buffer is to small, allocate large enough buffer on heap,
  1405. // and return allocated buffer.
  1406. static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
  1407. va_list ap_copy;
  1408. int len;
  1409. // Windows is not standard-compliant, and vsnprintf() returns -1 if
  1410. // buffer is too small. Also, older versions of msvcrt.dll do not have
  1411. // _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
  1412. // Therefore, we make two passes: on first pass, get required message length.
  1413. // On second pass, actually print the message.
  1414. va_copy(ap_copy, ap);
  1415. len = vsnprintf(NULL, 0, fmt, ap_copy);
  1416. if (len < 0) {
  1417. // C runtime is not standard compliant, vsnprintf() returned -1.
  1418. // Switch to alternative code path that uses incremental allocations.
  1419. va_copy(ap_copy, ap);
  1420. len = alloc_vprintf2(buf, fmt, ap);
  1421. } else if (len > (int) size &&
  1422. (size = len + 1) > 0 &&
  1423. (*buf = (char *) malloc(size)) == NULL) {
  1424. len = -1; // Allocation failed, mark failure
  1425. } else {
  1426. va_copy(ap_copy, ap);
  1427. vsnprintf(*buf, size, fmt, ap_copy);
  1428. }
  1429. return len;
  1430. }
  1431. int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
  1432. char mem[MG_BUF_LEN], *buf = mem;
  1433. int len;
  1434. if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
  1435. len = mg_write(conn, buf, (size_t) len);
  1436. }
  1437. if (buf != mem && buf != NULL) {
  1438. free(buf);
  1439. }
  1440. return len;
  1441. }
  1442. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1443. va_list ap;
  1444. va_start(ap, fmt);
  1445. return mg_vprintf(conn, fmt, ap);
  1446. }
  1447. int mg_url_decode(const char *src, int src_len, char *dst,
  1448. int dst_len, int is_form_url_encoded) {
  1449. int i, j, a, b;
  1450. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1451. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1452. if (src[i] == '%' && i < src_len - 2 &&
  1453. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1454. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1455. a = tolower(* (const unsigned char *) (src + i + 1));
  1456. b = tolower(* (const unsigned char *) (src + i + 2));
  1457. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1458. i += 2;
  1459. } else if (is_form_url_encoded && src[i] == '+') {
  1460. dst[j] = ' ';
  1461. } else {
  1462. dst[j] = src[i];
  1463. }
  1464. }
  1465. dst[j] = '\0'; // Null-terminate the destination
  1466. return i >= src_len ? j : -1;
  1467. }
  1468. int mg_get_var(const char *data, size_t data_len, const char *name,
  1469. char *dst, size_t dst_len) {
  1470. const char *p, *e, *s;
  1471. size_t name_len;
  1472. int len;
  1473. if (dst == NULL || dst_len == 0) {
  1474. len = -2;
  1475. } else if (data == NULL || name == NULL || data_len == 0) {
  1476. len = -1;
  1477. dst[0] = '\0';
  1478. } else {
  1479. name_len = strlen(name);
  1480. e = data + data_len;
  1481. len = -1;
  1482. dst[0] = '\0';
  1483. // data is "var1=val1&var2=val2...". Find variable first
  1484. for (p = data; p + name_len < e; p++) {
  1485. if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
  1486. !mg_strncasecmp(name, p, name_len)) {
  1487. // Point p to variable value
  1488. p += name_len + 1;
  1489. // Point s to the end of the value
  1490. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1491. if (s == NULL) {
  1492. s = e;
  1493. }
  1494. assert(s >= p);
  1495. // Decode variable into destination buffer
  1496. len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1497. // Redirect error code from -1 to -2 (destination buffer too small).
  1498. if (len == -1) {
  1499. len = -2;
  1500. }
  1501. break;
  1502. }
  1503. }
  1504. }
  1505. return len;
  1506. }
  1507. int mg_get_cookie(const char *cookie_header, const char *var_name,
  1508. char *dst, size_t dst_size) {
  1509. const char *s, *p, *end;
  1510. int name_len, len = -1;
  1511. if (dst == NULL || dst_size == 0) {
  1512. len = -2;
  1513. } else if (var_name == NULL || (s = cookie_header) == NULL) {
  1514. len = -1;
  1515. dst[0] = '\0';
  1516. } else {
  1517. name_len = (int) strlen(var_name);
  1518. end = s + strlen(s);
  1519. dst[0] = '\0';
  1520. for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
  1521. if (s[name_len] == '=') {
  1522. s += name_len + 1;
  1523. if ((p = strchr(s, ' ')) == NULL)
  1524. p = end;
  1525. if (p[-1] == ';')
  1526. p--;
  1527. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1528. s++;
  1529. p--;
  1530. }
  1531. if ((size_t) (p - s) < dst_size) {
  1532. len = p - s;
  1533. mg_strlcpy(dst, s, (size_t) len + 1);
  1534. } else {
  1535. len = -3;
  1536. }
  1537. break;
  1538. }
  1539. }
  1540. }
  1541. return len;
  1542. }
  1543. static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1544. size_t buf_len, struct file *filep) {
  1545. struct vec a, b;
  1546. const char *rewrite, *uri = conn->request_info.uri,
  1547. *root = conn->ctx->config[DOCUMENT_ROOT];
  1548. char *p;
  1549. int match_len;
  1550. char gz_path[PATH_MAX];
  1551. char const* accept_encoding;
  1552. // Using buf_len - 1 because memmove() for PATH_INFO may shift part
  1553. // of the path one byte on the right.
  1554. // If document_root is NULL, leave the file empty.
  1555. mg_snprintf(conn, buf, buf_len - 1, "%s%s",
  1556. root == NULL ? "" : root,
  1557. root == NULL ? "" : uri);
  1558. rewrite = conn->ctx->config[REWRITE];
  1559. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1560. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1561. mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
  1562. uri + match_len);
  1563. break;
  1564. }
  1565. }
  1566. if (mg_stat(conn, buf, filep)) return;
  1567. // if we can't find the actual file, look for the file
  1568. // with the same name but a .gz extension. If we find it,
  1569. // use that and set the gzipped flag in the file struct
  1570. // to indicate that the response need to have the content-
  1571. // encoding: gzip header
  1572. // we can only do this if the browser declares support
  1573. if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) {
  1574. if (strstr(accept_encoding,"gzip") != NULL) {
  1575. snprintf(gz_path, sizeof(gz_path), "%s.gz", buf);
  1576. if (mg_stat(conn, gz_path, filep)) {
  1577. filep->gzipped = 1;
  1578. return;
  1579. }
  1580. }
  1581. }
  1582. // Support PATH_INFO for CGI scripts.
  1583. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1584. if (*p == '/') {
  1585. *p = '\0';
  1586. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1587. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1588. mg_stat(conn, buf, filep)) {
  1589. // Shift PATH_INFO block one character right, e.g.
  1590. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1591. // conn->path_info is pointing to the local variable "path" declared
  1592. // in handle_request(), so PATH_INFO is not valid after
  1593. // handle_request returns.
  1594. conn->path_info = p + 1;
  1595. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1596. p[1] = '/';
  1597. break;
  1598. } else {
  1599. *p = '/';
  1600. }
  1601. }
  1602. }
  1603. }
  1604. // Check whether full request is buffered. Return:
  1605. // -1 if request is malformed
  1606. // 0 if request is not yet fully buffered
  1607. // >0 actual request length, including last \r\n\r\n
  1608. static int get_request_len(const char *buf, int buflen) {
  1609. const char *s, *e;
  1610. int len = 0;
  1611. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1612. // Control characters are not allowed but >=128 is.
  1613. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1614. *s != '\n' && * (const unsigned char *) s < 128) {
  1615. len = -1;
  1616. break; // [i_a] abort scan as soon as one malformed character is found;
  1617. // don't let subsequent \r\n\r\n win us over anyhow
  1618. } else if (s[0] == '\n' && s[1] == '\n') {
  1619. len = (int) (s - buf) + 2;
  1620. } else if (s[0] == '\n' && &s[1] < e &&
  1621. s[1] == '\r' && s[2] == '\n') {
  1622. len = (int) (s - buf) + 3;
  1623. }
  1624. return len;
  1625. }
  1626. // Convert month to the month number. Return -1 on error, or month number
  1627. static int get_month_index(const char *s) {
  1628. size_t i;
  1629. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1630. if (!strcmp(s, month_names[i]))
  1631. return (int) i;
  1632. return -1;
  1633. }
  1634. static int num_leap_years(int year) {
  1635. return year / 4 - year / 100 + year / 400;
  1636. }
  1637. // Parse UTC date-time string, and return the corresponding time_t value.
  1638. static time_t parse_date_string(const char *datetime) {
  1639. static const unsigned short days_before_month[] = {
  1640. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1641. };
  1642. char month_str[32];
  1643. int second, minute, hour, day, month, year, leap_days, days;
  1644. time_t result = (time_t) 0;
  1645. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1646. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1647. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1648. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1649. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1650. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1651. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1652. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1653. year > 1970 &&
  1654. (month = get_month_index(month_str)) != -1) {
  1655. leap_days = num_leap_years(year) - num_leap_years(1970);
  1656. year -= 1970;
  1657. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1658. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1659. }
  1660. return result;
  1661. }
  1662. // Protect against directory disclosure attack by removing '..',
  1663. // excessive '/' and '\' characters
  1664. static void remove_double_dots_and_double_slashes(char *s) {
  1665. char *p = s;
  1666. while (*s != '\0') {
  1667. *p++ = *s++;
  1668. if (s[-1] == '/' || s[-1] == '\\') {
  1669. // Skip all following slashes, backslashes and double-dots
  1670. while (s[0] != '\0') {
  1671. if (s[0] == '/' || s[0] == '\\') {
  1672. s++;
  1673. } else if (s[0] == '.' && s[1] == '.') {
  1674. s += 2;
  1675. } else {
  1676. break;
  1677. }
  1678. }
  1679. }
  1680. }
  1681. *p = '\0';
  1682. }
  1683. static const struct {
  1684. const char *extension;
  1685. size_t ext_len;
  1686. const char *mime_type;
  1687. } builtin_mime_types[] = {
  1688. {".html", 5, "text/html"},
  1689. {".htm", 4, "text/html"},
  1690. {".shtm", 5, "text/html"},
  1691. {".shtml", 6, "text/html"},
  1692. {".css", 4, "text/css"},
  1693. {".js", 3, "application/x-javascript"},
  1694. {".ico", 4, "image/x-icon"},
  1695. {".gif", 4, "image/gif"},
  1696. {".jpg", 4, "image/jpeg"},
  1697. {".jpeg", 5, "image/jpeg"},
  1698. {".png", 4, "image/png"},
  1699. {".svg", 4, "image/svg+xml"},
  1700. {".txt", 4, "text/plain"},
  1701. {".torrent", 8, "application/x-bittorrent"},
  1702. {".wav", 4, "audio/x-wav"},
  1703. {".mp3", 4, "audio/x-mp3"},
  1704. {".mid", 4, "audio/mid"},
  1705. {".m3u", 4, "audio/x-mpegurl"},
  1706. {".ogg", 4, "audio/ogg"},
  1707. {".ram", 4, "audio/x-pn-realaudio"},
  1708. {".xml", 4, "text/xml"},
  1709. {".json", 5, "text/json"},
  1710. {".xslt", 5, "application/xml"},
  1711. {".xsl", 4, "application/xml"},
  1712. {".ra", 3, "audio/x-pn-realaudio"},
  1713. {".doc", 4, "application/msword"},
  1714. {".exe", 4, "application/octet-stream"},
  1715. {".zip", 4, "application/x-zip-compressed"},
  1716. {".xls", 4, "application/excel"},
  1717. {".tgz", 4, "application/x-tar-gz"},
  1718. {".tar", 4, "application/x-tar"},
  1719. {".gz", 3, "application/x-gunzip"},
  1720. {".arj", 4, "application/x-arj-compressed"},
  1721. {".rar", 4, "application/x-arj-compressed"},
  1722. {".rtf", 4, "application/rtf"},
  1723. {".pdf", 4, "application/pdf"},
  1724. {".swf", 4, "application/x-shockwave-flash"},
  1725. {".mpg", 4, "video/mpeg"},
  1726. {".webm", 5, "video/webm"},
  1727. {".mpeg", 5, "video/mpeg"},
  1728. {".mov", 4, "video/quicktime"},
  1729. {".mp4", 4, "video/mp4"},
  1730. {".m4v", 4, "video/x-m4v"},
  1731. {".asf", 4, "video/x-ms-asf"},
  1732. {".avi", 4, "video/x-msvideo"},
  1733. {".bmp", 4, "image/bmp"},
  1734. {".ttf", 4, "application/x-font-ttf"},
  1735. {NULL, 0, NULL}
  1736. };
  1737. const char *mg_get_builtin_mime_type(const char *path) {
  1738. const char *ext;
  1739. size_t i, path_len;
  1740. path_len = strlen(path);
  1741. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1742. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1743. if (path_len > builtin_mime_types[i].ext_len &&
  1744. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1745. return builtin_mime_types[i].mime_type;
  1746. }
  1747. }
  1748. return "text/plain";
  1749. }
  1750. // Look at the "path" extension and figure what mime type it has.
  1751. // Store mime type in the vector.
  1752. static void get_mime_type(struct mg_context *ctx, const char *path,
  1753. struct vec *vec) {
  1754. struct vec ext_vec, mime_vec;
  1755. const char *list, *ext;
  1756. size_t path_len;
  1757. path_len = strlen(path);
  1758. // Scan user-defined mime types first, in case user wants to
  1759. // override default mime types.
  1760. list = ctx->config[EXTRA_MIME_TYPES];
  1761. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1762. // ext now points to the path suffix
  1763. ext = path + path_len - ext_vec.len;
  1764. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1765. *vec = mime_vec;
  1766. return;
  1767. }
  1768. }
  1769. vec->ptr = mg_get_builtin_mime_type(path);
  1770. vec->len = strlen(vec->ptr);
  1771. }
  1772. static int is_big_endian(void) {
  1773. static const int n = 1;
  1774. return ((char *) &n)[0] == 0;
  1775. }
  1776. #ifndef HAVE_MD5
  1777. typedef struct MD5Context {
  1778. uint32_t buf[4];
  1779. uint32_t bits[2];
  1780. unsigned char in[64];
  1781. } MD5_CTX;
  1782. static void byteReverse(unsigned char *buf, unsigned longs) {
  1783. uint32_t t;
  1784. // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
  1785. if (is_big_endian()) {
  1786. do {
  1787. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1788. ((unsigned) buf[1] << 8 | buf[0]);
  1789. * (uint32_t *) buf = t;
  1790. buf += 4;
  1791. } while (--longs);
  1792. }
  1793. }
  1794. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1795. #define F2(x, y, z) F1(z, x, y)
  1796. #define F3(x, y, z) (x ^ y ^ z)
  1797. #define F4(x, y, z) (y ^ (x | ~z))
  1798. #define MD5STEP(f, w, x, y, z, data, s) \
  1799. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1800. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1801. // initialization constants.
  1802. static void MD5Init(MD5_CTX *ctx) {
  1803. ctx->buf[0] = 0x67452301;
  1804. ctx->buf[1] = 0xefcdab89;
  1805. ctx->buf[2] = 0x98badcfe;
  1806. ctx->buf[3] = 0x10325476;
  1807. ctx->bits[0] = 0;
  1808. ctx->bits[1] = 0;
  1809. }
  1810. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1811. register uint32_t a, b, c, d;
  1812. a = buf[0];
  1813. b = buf[1];
  1814. c = buf[2];
  1815. d = buf[3];
  1816. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1817. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1818. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1819. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1820. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1821. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1822. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1823. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1824. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1825. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1826. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1827. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1828. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1829. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1830. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1831. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1832. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1833. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1834. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1835. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1836. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1837. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1838. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1839. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1840. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1841. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1842. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1843. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1844. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1845. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1846. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1847. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1848. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1849. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1850. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1851. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1852. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1853. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1854. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1855. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1856. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1857. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1858. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1859. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1860. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1861. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1862. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1863. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1864. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1865. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1866. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1867. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1868. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1869. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1870. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1871. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1872. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1873. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1874. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1875. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1876. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1877. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1878. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1879. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1880. buf[0] += a;
  1881. buf[1] += b;
  1882. buf[2] += c;
  1883. buf[3] += d;
  1884. }
  1885. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1886. uint32_t t;
  1887. t = ctx->bits[0];
  1888. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1889. ctx->bits[1]++;
  1890. ctx->bits[1] += len >> 29;
  1891. t = (t >> 3) & 0x3f;
  1892. if (t) {
  1893. unsigned char *p = (unsigned char *) ctx->in + t;
  1894. t = 64 - t;
  1895. if (len < t) {
  1896. memcpy(p, buf, len);
  1897. return;
  1898. }
  1899. memcpy(p, buf, t);
  1900. byteReverse(ctx->in, 16);
  1901. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1902. buf += t;
  1903. len -= t;
  1904. }
  1905. while (len >= 64) {
  1906. memcpy(ctx->in, buf, 64);
  1907. byteReverse(ctx->in, 16);
  1908. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1909. buf += 64;
  1910. len -= 64;
  1911. }
  1912. memcpy(ctx->in, buf, len);
  1913. }
  1914. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1915. unsigned count;
  1916. unsigned char *p;
  1917. uint32_t *a;
  1918. count = (ctx->bits[0] >> 3) & 0x3F;
  1919. p = ctx->in + count;
  1920. *p++ = 0x80;
  1921. count = 64 - 1 - count;
  1922. if (count < 8) {
  1923. memset(p, 0, count);
  1924. byteReverse(ctx->in, 16);
  1925. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1926. memset(ctx->in, 0, 56);
  1927. } else {
  1928. memset(p, 0, count - 8);
  1929. }
  1930. byteReverse(ctx->in, 14);
  1931. a = (uint32_t *)ctx->in;
  1932. a[14] = ctx->bits[0];
  1933. a[15] = ctx->bits[1];
  1934. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1935. byteReverse((unsigned char *) ctx->buf, 4);
  1936. memcpy(digest, ctx->buf, 16);
  1937. memset((char *) ctx, 0, sizeof(*ctx));
  1938. }
  1939. #endif // !HAVE_MD5
  1940. // Stringify binary data. Output buffer must be twice as big as input,
  1941. // because each byte takes 2 bytes in string representation
  1942. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1943. static const char *hex = "0123456789abcdef";
  1944. for (; len--; p++) {
  1945. *to++ = hex[p[0] >> 4];
  1946. *to++ = hex[p[0] & 0x0f];
  1947. }
  1948. *to = '\0';
  1949. }
  1950. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1951. char *mg_md5(char buf[33], ...) {
  1952. unsigned char hash[16];
  1953. const char *p;
  1954. va_list ap;
  1955. MD5_CTX ctx;
  1956. MD5Init(&ctx);
  1957. va_start(ap, buf);
  1958. while ((p = va_arg(ap, const char *)) != NULL) {
  1959. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1960. }
  1961. va_end(ap);
  1962. MD5Final(hash, &ctx);
  1963. bin2str(buf, hash, sizeof(hash));
  1964. return buf;
  1965. }
  1966. // Check the user's password, return 1 if OK
  1967. static int check_password(const char *method, const char *ha1, const char *uri,
  1968. const char *nonce, const char *nc, const char *cnonce,
  1969. const char *qop, const char *response) {
  1970. char ha2[32 + 1], expected_response[32 + 1];
  1971. // Some of the parameters may be NULL
  1972. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1973. qop == NULL || response == NULL) {
  1974. return 0;
  1975. }
  1976. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1977. // TODO(lsm): check for authentication timeout
  1978. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1979. strlen(response) != 32
  1980. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1981. ) {
  1982. return 0;
  1983. }
  1984. mg_md5(ha2, method, ":", uri, NULL);
  1985. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1986. ":", cnonce, ":", qop, ":", ha2, NULL);
  1987. return mg_strcasecmp(response, expected_response) == 0;
  1988. }
  1989. // Use the global passwords file, if specified by auth_gpass option,
  1990. // or search for .htpasswd in the requested directory.
  1991. static void open_auth_file(struct mg_connection *conn, const char *path,
  1992. struct file *filep) {
  1993. char name[PATH_MAX];
  1994. const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
  1995. struct file file = STRUCT_FILE_INITIALIZER;
  1996. if (gpass != NULL) {
  1997. // Use global passwords file
  1998. if (!mg_fopen(conn, gpass, "r", filep)) {
  1999. cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
  2000. }
  2001. // Important: using local struct file to test path for is_directory flag.
  2002. // If filep is used, mg_stat() makes it appear as if auth file was opened.
  2003. } else if (mg_stat(conn, path, &file) && file.is_directory) {
  2004. mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  2005. path, '/', PASSWORDS_FILE_NAME);
  2006. mg_fopen(conn, name, "r", filep);
  2007. } else {
  2008. // Try to find .htpasswd in requested directory.
  2009. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  2010. if (e[0] == '/')
  2011. break;
  2012. mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  2013. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  2014. mg_fopen(conn, name, "r", filep);
  2015. }
  2016. }
  2017. // Parsed Authorization header
  2018. struct ah {
  2019. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  2020. };
  2021. // Return 1 on success. Always initializes the ah structure.
  2022. static int parse_auth_header(struct mg_connection *conn, char *buf,
  2023. size_t buf_size, struct ah *ah) {
  2024. char *name, *value, *s;
  2025. const char *auth_header;
  2026. (void) memset(ah, 0, sizeof(*ah));
  2027. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  2028. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  2029. return 0;
  2030. }
  2031. // Make modifiable copy of the auth header
  2032. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  2033. s = buf;
  2034. // Parse authorization header
  2035. for (;;) {
  2036. // Gobble initial spaces
  2037. while (isspace(* (unsigned char *) s)) {
  2038. s++;
  2039. }
  2040. name = skip_quoted(&s, "=", " ", 0);
  2041. // Value is either quote-delimited, or ends at first comma or space.
  2042. if (s[0] == '\"') {
  2043. s++;
  2044. value = skip_quoted(&s, "\"", " ", '\\');
  2045. if (s[0] == ',') {
  2046. s++;
  2047. }
  2048. } else {
  2049. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  2050. }
  2051. if (*name == '\0') {
  2052. break;
  2053. }
  2054. if (!strcmp(name, "username")) {
  2055. ah->user = value;
  2056. } else if (!strcmp(name, "cnonce")) {
  2057. ah->cnonce = value;
  2058. } else if (!strcmp(name, "response")) {
  2059. ah->response = value;
  2060. } else if (!strcmp(name, "uri")) {
  2061. ah->uri = value;
  2062. } else if (!strcmp(name, "qop")) {
  2063. ah->qop = value;
  2064. } else if (!strcmp(name, "nc")) {
  2065. ah->nc = value;
  2066. } else if (!strcmp(name, "nonce")) {
  2067. ah->nonce = value;
  2068. }
  2069. }
  2070. // CGI needs it as REMOTE_USER
  2071. if (ah->user != NULL) {
  2072. conn->request_info.remote_user = mg_strdup(ah->user);
  2073. } else {
  2074. return 0;
  2075. }
  2076. return 1;
  2077. }
  2078. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
  2079. char *eof;
  2080. size_t len;
  2081. char *memend;
  2082. if (filep->membuf != NULL && *p != NULL) {
  2083. memend = (char *) &filep->membuf[filep->size];
  2084. eof = (char *) memchr(*p, '\n', memend - *p); // Search for \n from p till the end of stream
  2085. if (eof != NULL) {
  2086. eof += 1; // Include \n
  2087. } else {
  2088. eof = memend; // Copy remaining data
  2089. }
  2090. len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
  2091. memcpy(buf, *p, len);
  2092. buf[len] = '\0';
  2093. *p += len;
  2094. return len ? eof : NULL;
  2095. } else if (filep->fp != NULL) {
  2096. return fgets(buf, size, filep->fp);
  2097. } else {
  2098. return NULL;
  2099. }
  2100. }
  2101. // Authorize against the opened passwords file. Return 1 if authorized.
  2102. static int authorize(struct mg_connection *conn, struct file *filep) {
  2103. struct ah ah;
  2104. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
  2105. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  2106. return 0;
  2107. }
  2108. // Loop over passwords file
  2109. p = (char *) filep->membuf;
  2110. while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
  2111. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  2112. continue;
  2113. }
  2114. if (!strcmp(ah.user, f_user) &&
  2115. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  2116. return check_password(conn->request_info.request_method, ha1, ah.uri,
  2117. ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
  2118. }
  2119. return 0;
  2120. }
  2121. // Return 1 if request is authorised, 0 otherwise.
  2122. static int check_authorization(struct mg_connection *conn, const char *path) {
  2123. char fname[PATH_MAX];
  2124. struct vec uri_vec, filename_vec;
  2125. const char *list;
  2126. struct file file = STRUCT_FILE_INITIALIZER;
  2127. int authorized = 1;
  2128. list = conn->ctx->config[PROTECT_URI];
  2129. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  2130. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  2131. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2132. (int) filename_vec.len, filename_vec.ptr);
  2133. if (!mg_fopen(conn, fname, "r", &file)) {
  2134. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2135. }
  2136. break;
  2137. }
  2138. }
  2139. if (!is_file_opened(&file)) {
  2140. open_auth_file(conn, path, &file);
  2141. }
  2142. if (is_file_opened(&file)) {
  2143. authorized = authorize(conn, &file);
  2144. mg_fclose(&file);
  2145. }
  2146. return authorized;
  2147. }
  2148. static void send_authorization_request(struct mg_connection *conn) {
  2149. conn->status_code = 401;
  2150. mg_printf(conn,
  2151. "HTTP/1.1 401 Unauthorized\r\n"
  2152. "Content-Length: 0\r\n"
  2153. "WWW-Authenticate: Digest qop=\"auth\", "
  2154. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2155. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2156. (unsigned long) time(NULL));
  2157. }
  2158. static int is_authorized_for_put(struct mg_connection *conn) {
  2159. struct file file = STRUCT_FILE_INITIALIZER;
  2160. const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
  2161. int ret = 0;
  2162. if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
  2163. ret = authorize(conn, &file);
  2164. mg_fclose(&file);
  2165. }
  2166. return ret;
  2167. }
  2168. int mg_modify_passwords_file(const char *fname, const char *domain,
  2169. const char *user, const char *pass) {
  2170. int found;
  2171. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2172. FILE *fp, *fp2;
  2173. found = 0;
  2174. fp = fp2 = NULL;
  2175. // Regard empty password as no password - remove user record.
  2176. if (pass != NULL && pass[0] == '\0') {
  2177. pass = NULL;
  2178. }
  2179. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2180. // Create the file if does not exist
  2181. if ((fp = fopen(fname, "a+")) != NULL) {
  2182. (void) fclose(fp);
  2183. }
  2184. // Open the given file and temporary file
  2185. if ((fp = fopen(fname, "r")) == NULL) {
  2186. return 0;
  2187. } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
  2188. fclose(fp);
  2189. return 0;
  2190. }
  2191. // Copy the stuff to temporary file
  2192. while (fgets(line, sizeof(line), fp) != NULL) {
  2193. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2194. continue;
  2195. }
  2196. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2197. found++;
  2198. if (pass != NULL) {
  2199. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2200. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2201. }
  2202. } else {
  2203. fprintf(fp2, "%s", line);
  2204. }
  2205. }
  2206. // If new user, just add it
  2207. if (!found && pass != NULL) {
  2208. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2209. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2210. }
  2211. // Close files
  2212. fclose(fp);
  2213. fclose(fp2);
  2214. // Put the temp file in place of real file
  2215. remove(fname);
  2216. rename(tmp, fname);
  2217. return 1;
  2218. }
  2219. static SOCKET conn2(const char *host, int port, int use_ssl,
  2220. char *ebuf, size_t ebuf_len) {
  2221. struct sockaddr_in sin;
  2222. struct hostent *he;
  2223. SOCKET sock = INVALID_SOCKET;
  2224. if (host == NULL) {
  2225. snprintf(ebuf, ebuf_len, "%s", "NULL host");
  2226. } else if (use_ssl && SSLv23_client_method == NULL) {
  2227. snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
  2228. // TODO(lsm): use something threadsafe instead of gethostbyname()
  2229. } else if ((he = gethostbyname(host)) == NULL) {
  2230. snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
  2231. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  2232. snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
  2233. } else {
  2234. set_close_on_exec(sock);
  2235. sin.sin_family = AF_INET;
  2236. sin.sin_port = htons((uint16_t) port);
  2237. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  2238. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  2239. snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
  2240. host, port, strerror(ERRNO));
  2241. closesocket(sock);
  2242. sock = INVALID_SOCKET;
  2243. }
  2244. }
  2245. return sock;
  2246. }
  2247. void mg_url_encode(const char *src, char *dst, size_t dst_len) {
  2248. static const char *dont_escape = "._-$,;~()";
  2249. static const char *hex = "0123456789abcdef";
  2250. const char *end = dst + dst_len - 1;
  2251. for (; *src != '\0' && dst < end; src++, dst++) {
  2252. if (isalnum(*(const unsigned char *) src) ||
  2253. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2254. *dst = *src;
  2255. } else if (dst + 2 < end) {
  2256. dst[0] = '%';
  2257. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2258. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2259. dst += 2;
  2260. }
  2261. }
  2262. *dst = '\0';
  2263. }
  2264. static void print_dir_entry(struct de *de) {
  2265. char size[64], mod[64], href[PATH_MAX];
  2266. if (de->file.is_directory) {
  2267. mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2268. } else {
  2269. // We use (signed) cast below because MSVC 6 compiler cannot
  2270. // convert unsigned __int64 to double. Sigh.
  2271. if (de->file.size < 1024) {
  2272. mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
  2273. } else if (de->file.size < 0x100000) {
  2274. mg_snprintf(de->conn, size, sizeof(size),
  2275. "%.1fk", (double) de->file.size / 1024.0);
  2276. } else if (de->file.size < 0x40000000) {
  2277. mg_snprintf(de->conn, size, sizeof(size),
  2278. "%.1fM", (double) de->file.size / 1048576);
  2279. } else {
  2280. mg_snprintf(de->conn, size, sizeof(size),
  2281. "%.1fG", (double) de->file.size / 1073741824);
  2282. }
  2283. }
  2284. strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
  2285. localtime(&de->file.modification_time));
  2286. mg_url_encode(de->file_name, href, sizeof(href));
  2287. de->conn->num_bytes_sent += mg_printf(de->conn,
  2288. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2289. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2290. de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
  2291. de->file_name, de->file.is_directory ? "/" : "", mod, size);
  2292. }
  2293. // This function is called from send_directory() and used for
  2294. // sorting directory entries by size, or name, or modification time.
  2295. // On windows, __cdecl specification is needed in case if project is built
  2296. // with __stdcall convention. qsort always requires __cdels callback.
  2297. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2298. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2299. const char *query_string = a->conn->request_info.query_string;
  2300. int cmp_result = 0;
  2301. if (query_string == NULL) {
  2302. query_string = "na";
  2303. }
  2304. if (a->file.is_directory && !b->file.is_directory) {
  2305. return -1; // Always put directories on top
  2306. } else if (!a->file.is_directory && b->file.is_directory) {
  2307. return 1; // Always put directories on top
  2308. } else if (*query_string == 'n') {
  2309. cmp_result = strcmp(a->file_name, b->file_name);
  2310. } else if (*query_string == 's') {
  2311. cmp_result = a->file.size == b->file.size ? 0 :
  2312. a->file.size > b->file.size ? 1 : -1;
  2313. } else if (*query_string == 'd') {
  2314. cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
  2315. a->file.modification_time > b->file.modification_time ? 1 : -1;
  2316. }
  2317. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2318. }
  2319. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2320. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2321. const char *pattern = conn->ctx->config[HIDE_FILES];
  2322. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2323. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2324. }
  2325. static int scan_directory(struct mg_connection *conn, const char *dir,
  2326. void *data, void (*cb)(struct de *, void *)) {
  2327. char path[PATH_MAX];
  2328. struct dirent *dp;
  2329. DIR *dirp;
  2330. struct de de;
  2331. if ((dirp = opendir(dir)) == NULL) {
  2332. return 0;
  2333. } else {
  2334. de.conn = conn;
  2335. while ((dp = readdir(dirp)) != NULL) {
  2336. // Do not show current dir and hidden files
  2337. if (!strcmp(dp->d_name, ".") ||
  2338. !strcmp(dp->d_name, "..") ||
  2339. must_hide_file(conn, dp->d_name)) {
  2340. continue;
  2341. }
  2342. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2343. // If we don't memset stat structure to zero, mtime will have
  2344. // garbage and strftime() will segfault later on in
  2345. // print_dir_entry(). memset is required only if mg_stat()
  2346. // fails. For more details, see
  2347. // http://code.google.com/p/mongoose/issues/detail?id=79
  2348. memset(&de.file, 0, sizeof(de.file));
  2349. mg_stat(conn, path, &de.file);
  2350. de.file_name = dp->d_name;
  2351. cb(&de, data);
  2352. }
  2353. (void) closedir(dirp);
  2354. }
  2355. return 1;
  2356. }
  2357. static int remove_directory(struct mg_connection *conn, const char *dir) {
  2358. char path[PATH_MAX];
  2359. struct dirent *dp;
  2360. DIR *dirp;
  2361. struct de de;
  2362. if ((dirp = opendir(dir)) == NULL) {
  2363. return 0;
  2364. } else {
  2365. de.conn = conn;
  2366. while ((dp = readdir(dirp)) != NULL) {
  2367. // Do not show current dir (but show hidden files as they will also be removed)
  2368. if (!strcmp(dp->d_name, ".") ||
  2369. !strcmp(dp->d_name, "..")) {
  2370. continue;
  2371. }
  2372. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2373. // If we don't memset stat structure to zero, mtime will have
  2374. // garbage and strftime() will segfault later on in
  2375. // print_dir_entry(). memset is required only if mg_stat()
  2376. // fails. For more details, see
  2377. // http://code.google.com/p/mongoose/issues/detail?id=79
  2378. memset(&de.file, 0, sizeof(de.file));
  2379. mg_stat(conn, path, &de.file);
  2380. if(de.file.modification_time) {
  2381. if(de.file.is_directory) {
  2382. remove_directory(conn, path);
  2383. } else {
  2384. mg_remove(path);
  2385. }
  2386. }
  2387. }
  2388. (void) closedir(dirp);
  2389. rmdir(dir);
  2390. }
  2391. return 1;
  2392. }
  2393. struct dir_scan_data {
  2394. struct de *entries;
  2395. int num_entries;
  2396. int arr_size;
  2397. };
  2398. // Behaves like realloc(), but frees original pointer on failure
  2399. static void *realloc2(void *ptr, size_t size) {
  2400. void *new_ptr = realloc(ptr, size);
  2401. if (new_ptr == NULL) {
  2402. free(ptr);
  2403. }
  2404. return new_ptr;
  2405. }
  2406. static void dir_scan_callback(struct de *de, void *data) {
  2407. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2408. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2409. dsd->arr_size *= 2;
  2410. dsd->entries = (struct de *) realloc2(dsd->entries, dsd->arr_size *
  2411. sizeof(dsd->entries[0]));
  2412. }
  2413. if (dsd->entries == NULL) {
  2414. // TODO(lsm): propagate an error to the caller
  2415. dsd->num_entries = 0;
  2416. } else {
  2417. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2418. dsd->entries[dsd->num_entries].file = de->file;
  2419. dsd->entries[dsd->num_entries].conn = de->conn;
  2420. dsd->num_entries++;
  2421. }
  2422. }
  2423. static void handle_directory_request(struct mg_connection *conn,
  2424. const char *dir) {
  2425. int i, sort_direction;
  2426. struct dir_scan_data data = { NULL, 0, 128 };
  2427. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2428. send_http_error(conn, 500, "Cannot open directory",
  2429. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2430. return;
  2431. }
  2432. sort_direction = conn->request_info.query_string != NULL &&
  2433. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2434. conn->must_close = 1;
  2435. mg_printf(conn, "%s",
  2436. "HTTP/1.1 200 OK\r\n"
  2437. "Connection: close\r\n"
  2438. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2439. conn->num_bytes_sent += mg_printf(conn,
  2440. "<html><head><title>Index of %s</title>"
  2441. "<style>th {text-align: left;}</style></head>"
  2442. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2443. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2444. "<th><a href=\"?d%c\">Modified</a></th>"
  2445. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2446. "<tr><td colspan=\"3\"><hr></td></tr>",
  2447. conn->request_info.uri, conn->request_info.uri,
  2448. sort_direction, sort_direction, sort_direction);
  2449. // Print first entry - link to a parent directory
  2450. conn->num_bytes_sent += mg_printf(conn,
  2451. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2452. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2453. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2454. // Sort and print directory entries
  2455. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2456. compare_dir_entries);
  2457. for (i = 0; i < data.num_entries; i++) {
  2458. print_dir_entry(&data.entries[i]);
  2459. free(data.entries[i].file_name);
  2460. }
  2461. free(data.entries);
  2462. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2463. conn->status_code = 200;
  2464. }
  2465. // Send len bytes from the opened file to the client.
  2466. static void send_file_data(struct mg_connection *conn, struct file *filep,
  2467. int64_t offset, int64_t len) {
  2468. char buf[MG_BUF_LEN];
  2469. int to_read, num_read, num_written;
  2470. // Sanity check the offset
  2471. offset = offset < 0 ? 0 : offset > filep->size ? filep->size : offset;
  2472. if (len > 0 && filep->membuf != NULL && filep->size > 0) {
  2473. if (len > filep->size - offset) {
  2474. len = filep->size - offset;
  2475. }
  2476. mg_write(conn, filep->membuf + offset, (size_t) len);
  2477. } else if (len > 0 && filep->fp != NULL) {
  2478. fseeko(filep->fp, offset, SEEK_SET);
  2479. while (len > 0) {
  2480. // Calculate how much to read from the file in the buffer
  2481. to_read = sizeof(buf);
  2482. if ((int64_t) to_read > len) {
  2483. to_read = (int) len;
  2484. }
  2485. // Read from file, exit the loop on error
  2486. if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
  2487. break;
  2488. }
  2489. // Send read bytes to the client, exit the loop on error
  2490. if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
  2491. break;
  2492. }
  2493. // Both read and were successful, adjust counters
  2494. conn->num_bytes_sent += num_written;
  2495. len -= num_written;
  2496. }
  2497. }
  2498. }
  2499. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2500. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2501. }
  2502. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2503. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2504. }
  2505. static void construct_etag(char *buf, size_t buf_len,
  2506. const struct file *filep) {
  2507. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2508. (unsigned long) filep->modification_time, filep->size);
  2509. }
  2510. static void fclose_on_exec(struct file *filep) {
  2511. if (filep != NULL && filep->fp != NULL) {
  2512. #ifndef _WIN32
  2513. fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
  2514. #endif
  2515. }
  2516. }
  2517. static void handle_file_request(struct mg_connection *conn, const char *path,
  2518. struct file *filep) {
  2519. char date[64], lm[64], etag[64], range[64];
  2520. const char *msg = "OK", *hdr;
  2521. time_t curtime = time(NULL);
  2522. int64_t cl, r1, r2;
  2523. struct vec mime_vec;
  2524. int n;
  2525. char gz_path[PATH_MAX];
  2526. char const* encoding = "";
  2527. get_mime_type(conn->ctx, path, &mime_vec);
  2528. cl = filep->size;
  2529. conn->status_code = 200;
  2530. range[0] = '\0';
  2531. // if this file is in fact a pre-gzipped file, rewrite its filename
  2532. // it's important to rewrite the filename after resolving
  2533. // the mime type from it, to preserve the actual file's type
  2534. if (filep->gzipped) {
  2535. snprintf(gz_path, sizeof(gz_path), "%s.gz", path);
  2536. path = gz_path;
  2537. encoding = "Content-Encoding: gzip\r\n";
  2538. }
  2539. if (!mg_fopen(conn, path, "rb", filep)) {
  2540. send_http_error(conn, 500, http_500_error,
  2541. "fopen(%s): %s", path, strerror(ERRNO));
  2542. return;
  2543. }
  2544. fclose_on_exec(filep);
  2545. // If Range: header specified, act accordingly
  2546. r1 = r2 = 0;
  2547. hdr = mg_get_header(conn, "Range");
  2548. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
  2549. r1 >= 0 && r2 >= 0) {
  2550. // actually, range requests don't play well with a pre-gzipped
  2551. // file (since the range is specified in the uncmpressed space)
  2552. if (filep->gzipped) {
  2553. send_http_error(conn, 501, "Not Implemented", "range requests in gzipped files are not supported");
  2554. return;
  2555. }
  2556. conn->status_code = 206;
  2557. cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
  2558. mg_snprintf(conn, range, sizeof(range),
  2559. "Content-Range: bytes "
  2560. "%" INT64_FMT "-%"
  2561. INT64_FMT "/%" INT64_FMT "\r\n",
  2562. r1, r1 + cl - 1, filep->size);
  2563. msg = "Partial Content";
  2564. }
  2565. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2566. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2567. gmt_time_string(date, sizeof(date), &curtime);
  2568. gmt_time_string(lm, sizeof(lm), &filep->modification_time);
  2569. construct_etag(etag, sizeof(etag), filep);
  2570. (void) mg_printf(conn,
  2571. "HTTP/1.1 %d %s\r\n"
  2572. "Date: %s\r\n"
  2573. "Last-Modified: %s\r\n"
  2574. "Etag: %s\r\n"
  2575. "Content-Type: %.*s\r\n"
  2576. "Content-Length: %" INT64_FMT "\r\n"
  2577. "Connection: %s\r\n"
  2578. "Accept-Ranges: bytes\r\n"
  2579. "%s%s\r\n",
  2580. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2581. mime_vec.ptr, cl, suggest_connection_header(conn), range, encoding);
  2582. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2583. send_file_data(conn, filep, r1, cl);
  2584. }
  2585. mg_fclose(filep);
  2586. }
  2587. void mg_send_file(struct mg_connection *conn, const char *path) {
  2588. struct file file = STRUCT_FILE_INITIALIZER;
  2589. if (mg_stat(conn, path, &file)) {
  2590. handle_file_request(conn, path, &file);
  2591. } else {
  2592. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2593. }
  2594. }
  2595. // Parse HTTP headers from the given buffer, advance buffer to the point
  2596. // where parsing stopped.
  2597. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2598. int i;
  2599. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2600. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2601. ri->http_headers[i].value = skip(buf, "\r\n");
  2602. if (ri->http_headers[i].name[0] == '\0')
  2603. break;
  2604. ri->num_headers = i + 1;
  2605. }
  2606. }
  2607. static int is_valid_http_method(const char *method) {
  2608. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2609. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2610. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2611. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
  2612. || !strcmp(method, "MKCOL")
  2613. ;
  2614. }
  2615. // Parse HTTP request, fill in mg_request_info structure.
  2616. // This function modifies the buffer by NUL-terminating
  2617. // HTTP request components, header names and header values.
  2618. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2619. int is_request, request_length = get_request_len(buf, len);
  2620. if (request_length > 0) {
  2621. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2622. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2623. ri->num_headers = 0;
  2624. buf[request_length - 1] = '\0';
  2625. // RFC says that all initial whitespaces should be ingored
  2626. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2627. buf++;
  2628. }
  2629. ri->request_method = skip(&buf, " ");
  2630. ri->uri = skip(&buf, " ");
  2631. ri->http_version = skip(&buf, "\r\n");
  2632. // HTTP message could be either HTTP request or HTTP response, e.g.
  2633. // "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..."
  2634. is_request = is_valid_http_method(ri->request_method);
  2635. if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) ||
  2636. (!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
  2637. request_length = -1;
  2638. } else {
  2639. if (is_request) {
  2640. ri->http_version += 5;
  2641. }
  2642. parse_http_headers(&buf, ri);
  2643. }
  2644. }
  2645. return request_length;
  2646. }
  2647. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2648. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2649. // buffer (which marks the end of HTTP request). Buffer buf may already
  2650. // have some data. The length of the data is stored in nread.
  2651. // Upon every read operation, increase nread by the number of bytes read.
  2652. static int read_request(FILE *fp, struct mg_connection *conn,
  2653. char *buf, int bufsiz, int *nread) {
  2654. int request_len, n = 0;
  2655. request_len = get_request_len(buf, *nread);
  2656. while (conn->ctx->stop_flag == 0 &&
  2657. *nread < bufsiz && request_len == 0 &&
  2658. (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
  2659. *nread += n;
  2660. assert(*nread <= bufsiz);
  2661. request_len = get_request_len(buf, *nread);
  2662. }
  2663. return request_len <= 0 && n <= 0 ? -1 : request_len;
  2664. }
  2665. // For given directory path, substitute it to valid index file.
  2666. // Return 0 if index file has been found, -1 if not found.
  2667. // If the file is found, it's stats is returned in stp.
  2668. static int substitute_index_file(struct mg_connection *conn, char *path,
  2669. size_t path_len, struct file *filep) {
  2670. const char *list = conn->ctx->config[INDEX_FILES];
  2671. struct file file = STRUCT_FILE_INITIALIZER;
  2672. struct vec filename_vec;
  2673. size_t n = strlen(path);
  2674. int found = 0;
  2675. // The 'path' given to us points to the directory. Remove all trailing
  2676. // directory separator characters from the end of the path, and
  2677. // then append single directory separator character.
  2678. while (n > 0 && path[n - 1] == '/') {
  2679. n--;
  2680. }
  2681. path[n] = '/';
  2682. // Traverse index files list. For each entry, append it to the given
  2683. // path and see if the file exists. If it exists, break the loop
  2684. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2685. // Ignore too long entries that may overflow path buffer
  2686. if (filename_vec.len > path_len - (n + 2))
  2687. continue;
  2688. // Prepare full path to the index file
  2689. mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2690. // Does it exist?
  2691. if (mg_stat(conn, path, &file)) {
  2692. // Yes it does, break the loop
  2693. *filep = file;
  2694. found = 1;
  2695. break;
  2696. }
  2697. }
  2698. // If no index file exists, restore directory path
  2699. if (!found) {
  2700. path[n] = '\0';
  2701. }
  2702. return found;
  2703. }
  2704. // Return True if we should reply 304 Not Modified.
  2705. static int is_not_modified(const struct mg_connection *conn,
  2706. const struct file *filep) {
  2707. char etag[64];
  2708. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2709. const char *inm = mg_get_header(conn, "If-None-Match");
  2710. construct_etag(etag, sizeof(etag), filep);
  2711. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2712. (ims != NULL && filep->modification_time <= parse_date_string(ims));
  2713. }
  2714. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2715. SOCKET sock, SSL *ssl) {
  2716. const char *expect, *body;
  2717. char buf[MG_BUF_LEN];
  2718. int to_read, nread, buffered_len, success = 0;
  2719. expect = mg_get_header(conn, "Expect");
  2720. assert(fp != NULL);
  2721. if (conn->content_len == -1) {
  2722. send_http_error(conn, 411, "Length Required", "%s", "");
  2723. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2724. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2725. } else {
  2726. if (expect != NULL) {
  2727. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2728. }
  2729. body = conn->buf + conn->request_len + conn->consumed_content;
  2730. buffered_len = &conn->buf[conn->data_len] - body;
  2731. assert(buffered_len >= 0);
  2732. assert(conn->consumed_content == 0);
  2733. if (buffered_len > 0) {
  2734. if ((int64_t) buffered_len > conn->content_len) {
  2735. buffered_len = (int) conn->content_len;
  2736. }
  2737. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2738. conn->consumed_content += buffered_len;
  2739. }
  2740. nread = 0;
  2741. while (conn->consumed_content < conn->content_len) {
  2742. to_read = sizeof(buf);
  2743. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2744. to_read = (int) (conn->content_len - conn->consumed_content);
  2745. }
  2746. nread = pull(NULL, conn, buf, to_read);
  2747. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2748. break;
  2749. }
  2750. conn->consumed_content += nread;
  2751. }
  2752. if (conn->consumed_content == conn->content_len) {
  2753. success = nread >= 0;
  2754. }
  2755. // Each error code path in this function must send an error
  2756. if (!success) {
  2757. send_http_error(conn, 577, http_500_error, "%s", "");
  2758. }
  2759. }
  2760. return success;
  2761. }
  2762. #if !defined(NO_CGI)
  2763. // This structure helps to create an environment for the spawned CGI program.
  2764. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2765. // last element must be NULL.
  2766. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2767. // strings must reside in a contiguous buffer. The end of the buffer is
  2768. // marked by two '\0' characters.
  2769. // We satisfy both worlds: we create an envp array (which is vars), all
  2770. // entries are actually pointers inside buf.
  2771. struct cgi_env_block {
  2772. struct mg_connection *conn;
  2773. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2774. int len; // Space taken
  2775. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2776. int nvars; // Number of variables
  2777. };
  2778. static char *addenv(struct cgi_env_block *block,
  2779. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2780. PRINTF_ARGS(2, 3);
  2781. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2782. // pointer into the vars array.
  2783. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2784. int n, space;
  2785. char *added;
  2786. va_list ap;
  2787. // Calculate how much space is left in the buffer
  2788. space = sizeof(block->buf) - block->len - 2;
  2789. assert(space >= 0);
  2790. // Make a pointer to the free space int the buffer
  2791. added = block->buf + block->len;
  2792. // Copy VARIABLE=VALUE\0 string into the free space
  2793. va_start(ap, fmt);
  2794. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2795. va_end(ap);
  2796. // Make sure we do not overflow buffer and the envp array
  2797. if (n > 0 && n + 1 < space &&
  2798. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2799. // Append a pointer to the added string into the envp array
  2800. block->vars[block->nvars++] = added;
  2801. // Bump up used length counter. Include \0 terminator
  2802. block->len += n + 1;
  2803. } else {
  2804. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2805. }
  2806. return added;
  2807. }
  2808. static void prepare_cgi_environment(struct mg_connection *conn,
  2809. const char *prog,
  2810. struct cgi_env_block *blk) {
  2811. const char *s, *slash;
  2812. struct vec var_vec;
  2813. char *p, src_addr[IP_ADDR_STR_LEN];
  2814. int i;
  2815. blk->len = blk->nvars = 0;
  2816. blk->conn = conn;
  2817. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2818. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2819. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2820. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2821. addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", mg_version());
  2822. // Prepare the environment block
  2823. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2824. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2825. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2826. // TODO(lsm): fix this for IPv6 case
  2827. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2828. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2829. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2830. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2831. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2832. // SCRIPT_NAME
  2833. assert(conn->request_info.uri[0] == '/');
  2834. slash = strrchr(conn->request_info.uri, '/');
  2835. if ((s = strrchr(prog, '/')) == NULL)
  2836. s = prog;
  2837. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2838. conn->request_info.uri, s);
  2839. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2840. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2841. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2842. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2843. addenv(blk, "CONTENT_TYPE=%s", s);
  2844. if (conn->request_info.query_string != NULL)
  2845. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2846. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2847. addenv(blk, "CONTENT_LENGTH=%s", s);
  2848. if ((s = getenv("PATH")) != NULL)
  2849. addenv(blk, "PATH=%s", s);
  2850. if (conn->path_info != NULL) {
  2851. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2852. }
  2853. #if defined(_WIN32)
  2854. if ((s = getenv("COMSPEC")) != NULL) {
  2855. addenv(blk, "COMSPEC=%s", s);
  2856. }
  2857. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2858. addenv(blk, "SYSTEMROOT=%s", s);
  2859. }
  2860. if ((s = getenv("SystemDrive")) != NULL) {
  2861. addenv(blk, "SystemDrive=%s", s);
  2862. }
  2863. if ((s = getenv("ProgramFiles")) != NULL) {
  2864. addenv(blk, "ProgramFiles=%s", s);
  2865. }
  2866. if ((s = getenv("ProgramFiles(x86)")) != NULL) {
  2867. addenv(blk, "ProgramFiles(x86)=%s", s);
  2868. }
  2869. #else
  2870. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2871. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2872. #endif // _WIN32
  2873. if ((s = getenv("PERLLIB")) != NULL)
  2874. addenv(blk, "PERLLIB=%s", s);
  2875. if (conn->request_info.remote_user != NULL) {
  2876. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2877. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2878. }
  2879. // Add all headers as HTTP_* variables
  2880. for (i = 0; i < conn->request_info.num_headers; i++) {
  2881. p = addenv(blk, "HTTP_%s=%s",
  2882. conn->request_info.http_headers[i].name,
  2883. conn->request_info.http_headers[i].value);
  2884. // Convert variable name into uppercase, and change - to _
  2885. for (; *p != '=' && *p != '\0'; p++) {
  2886. if (*p == '-')
  2887. *p = '_';
  2888. *p = (char) toupper(* (unsigned char *) p);
  2889. }
  2890. }
  2891. // Add user-specified variables
  2892. s = conn->ctx->config[CGI_ENVIRONMENT];
  2893. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2894. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2895. }
  2896. blk->vars[blk->nvars++] = NULL;
  2897. blk->buf[blk->len++] = '\0';
  2898. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2899. assert(blk->len > 0);
  2900. assert(blk->len < (int) sizeof(blk->buf));
  2901. }
  2902. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2903. int headers_len, data_len, i, fdin[2], fdout[2];
  2904. const char *status, *status_text;
  2905. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2906. struct mg_request_info ri;
  2907. struct cgi_env_block blk;
  2908. FILE *in = NULL, *out = NULL;
  2909. struct file fout = STRUCT_FILE_INITIALIZER;
  2910. pid_t pid = (pid_t) -1;
  2911. prepare_cgi_environment(conn, prog, &blk);
  2912. // CGI must be executed in its own directory. 'dir' must point to the
  2913. // directory containing executable program, 'p' must point to the
  2914. // executable program name relative to 'dir'.
  2915. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2916. if ((p = strrchr(dir, '/')) != NULL) {
  2917. *p++ = '\0';
  2918. } else {
  2919. dir[0] = '.', dir[1] = '\0';
  2920. p = (char *) prog;
  2921. }
  2922. if (pipe(fdin) != 0 || pipe(fdout) != 0) {
  2923. send_http_error(conn, 500, http_500_error,
  2924. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2925. goto done;
  2926. }
  2927. pid = spawn_process(conn, p, blk.buf, blk.vars, fdin[0], fdout[1], dir);
  2928. if (pid == (pid_t) -1) {
  2929. send_http_error(conn, 500, http_500_error,
  2930. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2931. goto done;
  2932. }
  2933. // Make sure child closes all pipe descriptors. It must dup them to 0,1
  2934. set_close_on_exec(fdin[0]);
  2935. set_close_on_exec(fdin[1]);
  2936. set_close_on_exec(fdout[0]);
  2937. set_close_on_exec(fdout[1]);
  2938. // Parent closes only one side of the pipes.
  2939. // If we don't mark them as closed, close() attempt before
  2940. // return from this function throws an exception on Windows.
  2941. // Windows does not like when closed descriptor is closed again.
  2942. (void) close(fdin[0]);
  2943. (void) close(fdout[1]);
  2944. fdin[0] = fdout[1] = -1;
  2945. if ((in = fdopen(fdin[1], "wb")) == NULL ||
  2946. (out = fdopen(fdout[0], "rb")) == NULL) {
  2947. send_http_error(conn, 500, http_500_error,
  2948. "fopen: %s", strerror(ERRNO));
  2949. goto done;
  2950. }
  2951. setbuf(in, NULL);
  2952. setbuf(out, NULL);
  2953. fout.fp = out;
  2954. // Send POST data to the CGI process if needed
  2955. if (!strcmp(conn->request_info.request_method, "POST") &&
  2956. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2957. goto done;
  2958. }
  2959. // Close so child gets an EOF.
  2960. fclose(in);
  2961. in = NULL;
  2962. fdin[1] = -1;
  2963. // Now read CGI reply into a buffer. We need to set correct
  2964. // status code, thus we need to see all HTTP headers first.
  2965. // Do not send anything back to client, until we buffer in all
  2966. // HTTP headers.
  2967. data_len = 0;
  2968. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2969. if (headers_len <= 0) {
  2970. send_http_error(conn, 500, http_500_error,
  2971. "CGI program sent malformed or too big (>%u bytes) "
  2972. "HTTP headers: [%.*s]",
  2973. (unsigned) sizeof(buf), data_len, buf);
  2974. goto done;
  2975. }
  2976. pbuf = buf;
  2977. buf[headers_len - 1] = '\0';
  2978. parse_http_headers(&pbuf, &ri);
  2979. // Make up and send the status line
  2980. status_text = "OK";
  2981. if ((status = get_header(&ri, "Status")) != NULL) {
  2982. conn->status_code = atoi(status);
  2983. status_text = status;
  2984. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2985. status_text++;
  2986. }
  2987. } else if (get_header(&ri, "Location") != NULL) {
  2988. conn->status_code = 302;
  2989. } else {
  2990. conn->status_code = 200;
  2991. }
  2992. if (get_header(&ri, "Connection") != NULL &&
  2993. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2994. conn->must_close = 1;
  2995. }
  2996. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2997. status_text);
  2998. // Send headers
  2999. for (i = 0; i < ri.num_headers; i++) {
  3000. mg_printf(conn, "%s: %s\r\n",
  3001. ri.http_headers[i].name, ri.http_headers[i].value);
  3002. }
  3003. mg_write(conn, "\r\n", 2);
  3004. // Send chunk of data that may have been read after the headers
  3005. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  3006. (size_t)(data_len - headers_len));
  3007. // Read the rest of CGI output and send to the client
  3008. send_file_data(conn, &fout, 0, INT64_MAX);
  3009. done:
  3010. if (pid != (pid_t) -1) {
  3011. kill(pid, SIGKILL);
  3012. }
  3013. if (fdin[0] != -1) {
  3014. close(fdin[0]);
  3015. }
  3016. if (fdout[1] != -1) {
  3017. close(fdout[1]);
  3018. }
  3019. if (in != NULL) {
  3020. fclose(in);
  3021. } else if (fdin[1] != -1) {
  3022. close(fdin[1]);
  3023. }
  3024. if (out != NULL) {
  3025. fclose(out);
  3026. } else if (fdout[0] != -1) {
  3027. close(fdout[0]);
  3028. }
  3029. }
  3030. #endif // !NO_CGI
  3031. // For a given PUT path, create all intermediate subdirectories
  3032. // for given path. Return 0 if the path itself is a directory,
  3033. // or -1 on error, 1 if OK.
  3034. static int put_dir(struct mg_connection *conn, const char *path) {
  3035. char buf[PATH_MAX];
  3036. const char *s, *p;
  3037. struct file file = STRUCT_FILE_INITIALIZER;
  3038. int len, res = 1;
  3039. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  3040. len = p - path;
  3041. if (len >= (int) sizeof(buf)) {
  3042. res = -1;
  3043. break;
  3044. }
  3045. memcpy(buf, path, len);
  3046. buf[len] = '\0';
  3047. // Try to create intermediate directory
  3048. DEBUG_TRACE(("mkdir(%s)", buf));
  3049. if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
  3050. res = -1;
  3051. break;
  3052. }
  3053. // Is path itself a directory?
  3054. if (p[1] == '\0') {
  3055. res = 0;
  3056. }
  3057. }
  3058. return res;
  3059. }
  3060. static void mkcol(struct mg_connection *conn, const char *path) {
  3061. int rc, body_len;
  3062. struct de de;
  3063. memset(&de.file, 0, sizeof(de.file));
  3064. mg_stat(conn, path, &de.file);
  3065. if(de.file.modification_time) {
  3066. send_http_error(conn, 405, "Method Not Allowed",
  3067. "mkcol(%s): %s", path, strerror(ERRNO));
  3068. return;
  3069. }
  3070. body_len = conn->data_len - conn->request_len;
  3071. if(body_len > 0) {
  3072. send_http_error(conn, 415, "Unsupported media type",
  3073. "mkcol(%s): %s", path, strerror(ERRNO));
  3074. return;
  3075. }
  3076. rc = mg_mkdir(path, 0755);
  3077. if (rc == 0) {
  3078. conn->status_code = 201;
  3079. mg_printf(conn, "HTTP/1.1 %d Created\r\n\r\n", conn->status_code);
  3080. } else if (rc == -1) {
  3081. if(errno == EEXIST)
  3082. send_http_error(conn, 405, "Method Not Allowed",
  3083. "mkcol(%s): %s", path, strerror(ERRNO));
  3084. else if(errno == EACCES)
  3085. send_http_error(conn, 403, "Forbidden",
  3086. "mkcol(%s): %s", path, strerror(ERRNO));
  3087. else if(errno == ENOENT)
  3088. send_http_error(conn, 409, "Conflict",
  3089. "mkcol(%s): %s", path, strerror(ERRNO));
  3090. else
  3091. send_http_error(conn, 500, http_500_error,
  3092. "fopen(%s): %s", path, strerror(ERRNO));
  3093. }
  3094. }
  3095. static void put_file(struct mg_connection *conn, const char *path) {
  3096. struct file file = STRUCT_FILE_INITIALIZER;
  3097. const char *range;
  3098. int64_t r1, r2;
  3099. int rc;
  3100. conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
  3101. if ((rc = put_dir(conn, path)) == 0) {
  3102. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  3103. } else if (rc == -1) {
  3104. send_http_error(conn, 500, http_500_error,
  3105. "put_dir(%s): %s", path, strerror(ERRNO));
  3106. } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
  3107. mg_fclose(&file);
  3108. send_http_error(conn, 500, http_500_error,
  3109. "fopen(%s): %s", path, strerror(ERRNO));
  3110. } else {
  3111. fclose_on_exec(&file);
  3112. range = mg_get_header(conn, "Content-Range");
  3113. r1 = r2 = 0;
  3114. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  3115. conn->status_code = 206;
  3116. fseeko(file.fp, r1, SEEK_SET);
  3117. }
  3118. if (!forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
  3119. conn->status_code = 500;
  3120. }
  3121. mg_printf(conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
  3122. conn->status_code);
  3123. mg_fclose(&file);
  3124. }
  3125. }
  3126. static void send_ssi_file(struct mg_connection *, const char *,
  3127. struct file *, int);
  3128. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  3129. char *tag, int include_level) {
  3130. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  3131. struct file file = STRUCT_FILE_INITIALIZER;
  3132. // sscanf() is safe here, since send_ssi_file() also uses buffer
  3133. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  3134. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  3135. // File name is relative to the webserver root
  3136. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  3137. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  3138. } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
  3139. // File name is relative to the webserver working directory
  3140. // or it is absolute system path
  3141. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  3142. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
  3143. sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  3144. // File name is relative to the currect document
  3145. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  3146. if ((p = strrchr(path, '/')) != NULL) {
  3147. p[1] = '\0';
  3148. }
  3149. (void) mg_snprintf(conn, path + strlen(path),
  3150. sizeof(path) - strlen(path), "%s", file_name);
  3151. } else {
  3152. cry(conn, "Bad SSI #include: [%s]", tag);
  3153. return;
  3154. }
  3155. if (!mg_fopen(conn, path, "rb", &file)) {
  3156. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  3157. tag, path, strerror(ERRNO));
  3158. } else {
  3159. fclose_on_exec(&file);
  3160. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3161. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  3162. send_ssi_file(conn, path, &file, include_level + 1);
  3163. } else {
  3164. send_file_data(conn, &file, 0, INT64_MAX);
  3165. }
  3166. mg_fclose(&file);
  3167. }
  3168. }
  3169. #if !defined(NO_POPEN)
  3170. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  3171. char cmd[MG_BUF_LEN];
  3172. struct file file = STRUCT_FILE_INITIALIZER;
  3173. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  3174. cry(conn, "Bad SSI #exec: [%s]", tag);
  3175. } else if ((file.fp = popen(cmd, "r")) == NULL) {
  3176. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  3177. } else {
  3178. send_file_data(conn, &file, 0, INT64_MAX);
  3179. pclose(file.fp);
  3180. }
  3181. }
  3182. #endif // !NO_POPEN
  3183. static int mg_fgetc(struct file *filep, int offset) {
  3184. if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
  3185. return ((unsigned char *) filep->membuf)[offset];
  3186. } else if (filep->fp != NULL) {
  3187. return fgetc(filep->fp);
  3188. } else {
  3189. return EOF;
  3190. }
  3191. }
  3192. static void send_ssi_file(struct mg_connection *conn, const char *path,
  3193. struct file *filep, int include_level) {
  3194. char buf[MG_BUF_LEN];
  3195. int ch, offset, len, in_ssi_tag;
  3196. if (include_level > 10) {
  3197. cry(conn, "SSI #include level is too deep (%s)", path);
  3198. return;
  3199. }
  3200. in_ssi_tag = len = offset = 0;
  3201. while ((ch = mg_fgetc(filep, offset)) != EOF) {
  3202. if (in_ssi_tag && ch == '>') {
  3203. in_ssi_tag = 0;
  3204. buf[len++] = (char) ch;
  3205. buf[len] = '\0';
  3206. assert(len <= (int) sizeof(buf));
  3207. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  3208. // Not an SSI tag, pass it
  3209. (void) mg_write(conn, buf, (size_t) len);
  3210. } else {
  3211. if (!memcmp(buf + 5, "include", 7)) {
  3212. do_ssi_include(conn, path, buf + 12, include_level);
  3213. #if !defined(NO_POPEN)
  3214. } else if (!memcmp(buf + 5, "exec", 4)) {
  3215. do_ssi_exec(conn, buf + 9);
  3216. #endif // !NO_POPEN
  3217. } else {
  3218. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  3219. }
  3220. }
  3221. len = 0;
  3222. } else if (in_ssi_tag) {
  3223. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  3224. // Not an SSI tag
  3225. in_ssi_tag = 0;
  3226. } else if (len == (int) sizeof(buf) - 2) {
  3227. cry(conn, "%s: SSI tag is too large", path);
  3228. len = 0;
  3229. }
  3230. buf[len++] = ch & 0xff;
  3231. } else if (ch == '<') {
  3232. in_ssi_tag = 1;
  3233. if (len > 0) {
  3234. mg_write(conn, buf, (size_t) len);
  3235. }
  3236. len = 0;
  3237. buf[len++] = ch & 0xff;
  3238. } else {
  3239. buf[len++] = ch & 0xff;
  3240. if (len == (int) sizeof(buf)) {
  3241. mg_write(conn, buf, (size_t) len);
  3242. len = 0;
  3243. }
  3244. }
  3245. }
  3246. // Send the rest of buffered data
  3247. if (len > 0) {
  3248. mg_write(conn, buf, (size_t) len);
  3249. }
  3250. }
  3251. static void handle_ssi_file_request(struct mg_connection *conn,
  3252. const char *path) {
  3253. struct file file = STRUCT_FILE_INITIALIZER;
  3254. if (!mg_fopen(conn, path, "rb", &file)) {
  3255. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  3256. strerror(ERRNO));
  3257. } else {
  3258. conn->must_close = 1;
  3259. fclose_on_exec(&file);
  3260. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  3261. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  3262. suggest_connection_header(conn));
  3263. send_ssi_file(conn, path, &file, 0);
  3264. mg_fclose(&file);
  3265. }
  3266. }
  3267. static void send_options(struct mg_connection *conn) {
  3268. conn->status_code = 200;
  3269. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3270. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS, PROPFIND, MKCOL\r\n"
  3271. "DAV: 1\r\n\r\n");
  3272. }
  3273. // Writes PROPFIND properties for a collection element
  3274. static void print_props(struct mg_connection *conn, const char* uri,
  3275. struct file *filep) {
  3276. char mtime[64];
  3277. gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
  3278. conn->num_bytes_sent += mg_printf(conn,
  3279. "<d:response>"
  3280. "<d:href>%s</d:href>"
  3281. "<d:propstat>"
  3282. "<d:prop>"
  3283. "<d:resourcetype>%s</d:resourcetype>"
  3284. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3285. "<d:getlastmodified>%s</d:getlastmodified>"
  3286. "</d:prop>"
  3287. "<d:status>HTTP/1.1 200 OK</d:status>"
  3288. "</d:propstat>"
  3289. "</d:response>\n",
  3290. uri,
  3291. filep->is_directory ? "<d:collection/>" : "",
  3292. filep->size,
  3293. mtime);
  3294. }
  3295. static void print_dav_dir_entry(struct de *de, void *data) {
  3296. char href[PATH_MAX];
  3297. char href_encoded[PATH_MAX];
  3298. struct mg_connection *conn = (struct mg_connection *) data;
  3299. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3300. conn->request_info.uri, de->file_name);
  3301. mg_url_encode(href, href_encoded, PATH_MAX-1);
  3302. print_props(conn, href_encoded, &de->file);
  3303. }
  3304. static void handle_propfind(struct mg_connection *conn, const char *path,
  3305. struct file *filep) {
  3306. const char *depth = mg_get_header(conn, "Depth");
  3307. conn->must_close = 1;
  3308. conn->status_code = 207;
  3309. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3310. "Connection: close\r\n"
  3311. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3312. conn->num_bytes_sent += mg_printf(conn,
  3313. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3314. "<d:multistatus xmlns:d='DAV:'>\n");
  3315. // Print properties for the requested resource itself
  3316. print_props(conn, conn->request_info.uri, filep);
  3317. // If it is a directory, print directory entries too if Depth is not 0
  3318. if (filep->is_directory &&
  3319. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3320. (depth == NULL || strcmp(depth, "0") != 0)) {
  3321. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3322. }
  3323. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3324. }
  3325. #if defined(USE_WEBSOCKET)
  3326. // START OF SHA-1 code
  3327. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3328. #define SHA1HANDSOFF
  3329. #if defined(__sun)
  3330. #include "solarisfixes.h"
  3331. #endif
  3332. union char64long16 { unsigned char c[64]; uint32_t l[16]; };
  3333. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3334. static uint32_t blk0(union char64long16 *block, int i) {
  3335. // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
  3336. if (!is_big_endian()) {
  3337. block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
  3338. (rol(block->l[i], 8) & 0x00FF00FF);
  3339. }
  3340. return block->l[i];
  3341. }
  3342. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3343. ^block->l[(i+2)&15]^block->l[i&15],1))
  3344. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
  3345. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3346. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3347. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3348. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3349. typedef struct {
  3350. uint32_t state[5];
  3351. uint32_t count[2];
  3352. unsigned char buffer[64];
  3353. } SHA1_CTX;
  3354. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3355. uint32_t a, b, c, d, e;
  3356. union char64long16 block[1];
  3357. memcpy(block, buffer, 64);
  3358. a = state[0];
  3359. b = state[1];
  3360. c = state[2];
  3361. d = state[3];
  3362. e = state[4];
  3363. R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
  3364. R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
  3365. R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
  3366. R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
  3367. R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
  3368. R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
  3369. R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
  3370. R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
  3371. R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
  3372. R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
  3373. R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
  3374. R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
  3375. R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
  3376. R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
  3377. R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
  3378. R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
  3379. R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
  3380. R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
  3381. R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
  3382. R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
  3383. state[0] += a;
  3384. state[1] += b;
  3385. state[2] += c;
  3386. state[3] += d;
  3387. state[4] += e;
  3388. a = b = c = d = e = 0;
  3389. memset(block, '\0', sizeof(block));
  3390. }
  3391. static void SHA1Init(SHA1_CTX* context) {
  3392. context->state[0] = 0x67452301;
  3393. context->state[1] = 0xEFCDAB89;
  3394. context->state[2] = 0x98BADCFE;
  3395. context->state[3] = 0x10325476;
  3396. context->state[4] = 0xC3D2E1F0;
  3397. context->count[0] = context->count[1] = 0;
  3398. }
  3399. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3400. uint32_t len) {
  3401. uint32_t i, j;
  3402. j = context->count[0];
  3403. if ((context->count[0] += len << 3) < j)
  3404. context->count[1]++;
  3405. context->count[1] += (len>>29);
  3406. j = (j >> 3) & 63;
  3407. if ((j + len) > 63) {
  3408. memcpy(&context->buffer[j], data, (i = 64-j));
  3409. SHA1Transform(context->state, context->buffer);
  3410. for ( ; i + 63 < len; i += 64) {
  3411. SHA1Transform(context->state, &data[i]);
  3412. }
  3413. j = 0;
  3414. }
  3415. else i = 0;
  3416. memcpy(&context->buffer[j], &data[i], len - i);
  3417. }
  3418. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3419. unsigned i;
  3420. unsigned char finalcount[8], c;
  3421. for (i = 0; i < 8; i++) {
  3422. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3423. >> ((3-(i & 3)) * 8) ) & 255);
  3424. }
  3425. c = 0200;
  3426. SHA1Update(context, &c, 1);
  3427. while ((context->count[0] & 504) != 448) {
  3428. c = 0000;
  3429. SHA1Update(context, &c, 1);
  3430. }
  3431. SHA1Update(context, finalcount, 8);
  3432. for (i = 0; i < 20; i++) {
  3433. digest[i] = (unsigned char)
  3434. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3435. }
  3436. memset(context, '\0', sizeof(*context));
  3437. memset(&finalcount, '\0', sizeof(finalcount));
  3438. }
  3439. // END OF SHA1 CODE
  3440. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3441. static const char *b64 =
  3442. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3443. int i, j, a, b, c;
  3444. for (i = j = 0; i < src_len; i += 3) {
  3445. a = src[i];
  3446. b = i + 1 >= src_len ? 0 : src[i + 1];
  3447. c = i + 2 >= src_len ? 0 : src[i + 2];
  3448. dst[j++] = b64[a >> 2];
  3449. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3450. if (i + 1 < src_len) {
  3451. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3452. }
  3453. if (i + 2 < src_len) {
  3454. dst[j++] = b64[c & 63];
  3455. }
  3456. }
  3457. while (j % 4 != 0) {
  3458. dst[j++] = '=';
  3459. }
  3460. dst[j++] = '\0';
  3461. }
  3462. static void send_websocket_handshake(struct mg_connection *conn) {
  3463. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3464. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3465. SHA1_CTX sha_ctx;
  3466. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3467. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3468. SHA1Init(&sha_ctx);
  3469. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3470. SHA1Final((unsigned char *) sha, &sha_ctx);
  3471. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3472. mg_printf(conn, "%s%s%s",
  3473. "HTTP/1.1 101 Switching Protocols\r\n"
  3474. "Upgrade: websocket\r\n"
  3475. "Connection: Upgrade\r\n"
  3476. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3477. }
  3478. static void read_websocket(struct mg_connection *conn) {
  3479. // Pointer to the beginning of the portion of the incoming websocket message
  3480. // queue. The original websocket upgrade request is never removed,
  3481. // so the queue begins after it.
  3482. unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
  3483. int bits, n, stop = 0;
  3484. size_t i, len, mask_len, data_len, header_len, body_len;
  3485. // data points to the place where the message is stored when passed to the
  3486. // websocket_data callback. This is either mem on the stack,
  3487. // or a dynamically allocated buffer if it is too large.
  3488. char mem[4 * 1024], mask[4], *data;
  3489. assert(conn->content_len == 0);
  3490. // Loop continuously, reading messages from the socket, invoking the callback,
  3491. // and waiting repeatedly until an error occurs.
  3492. while (!stop) {
  3493. header_len = 0;
  3494. // body_len is the length of the entire queue in bytes
  3495. // len is the length of the current message
  3496. // data_len is the length of the current message's data payload
  3497. // header_len is the length of the current message's header
  3498. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3499. len = buf[1] & 127;
  3500. mask_len = buf[1] & 128 ? 4 : 0;
  3501. if (len < 126 && body_len >= mask_len) {
  3502. data_len = len;
  3503. header_len = 2 + mask_len;
  3504. } else if (len == 126 && body_len >= 4 + mask_len) {
  3505. header_len = 4 + mask_len;
  3506. data_len = ((((int) buf[2]) << 8) + buf[3]);
  3507. } else if (body_len >= 10 + mask_len) {
  3508. header_len = 10 + mask_len;
  3509. data_len = (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
  3510. htonl(* (uint32_t *) &buf[6]);
  3511. }
  3512. }
  3513. // Data layout is as follows:
  3514. // conn->buf buf
  3515. // v v frame1 | frame2
  3516. // |---------------------|----------------|--------------|-------
  3517. // | |<--header_len-->|<--data_len-->|
  3518. // |<-conn->request_len->|<-----body_len----------->|
  3519. // |<-------------------conn->data_len------------->|
  3520. if (header_len > 0) {
  3521. // Allocate space to hold websocket payload
  3522. data = mem;
  3523. if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
  3524. // Allocation failed, exit the loop and then close the connection
  3525. // TODO: notify user about the failure
  3526. break;
  3527. }
  3528. // Save mask and bits, otherwise it may be clobbered by memmove below
  3529. bits = buf[0];
  3530. memcpy(mask, buf + header_len - mask_len, mask_len);
  3531. // Read frame payload into the allocated buffer.
  3532. assert(body_len >= header_len);
  3533. if (data_len + header_len > body_len) {
  3534. len = body_len - header_len;
  3535. memcpy(data, buf + header_len, len);
  3536. // TODO: handle pull error
  3537. pull_all(NULL, conn, data + len, data_len - len);
  3538. conn->data_len = conn->request_len;
  3539. } else {
  3540. len = data_len + header_len;
  3541. memcpy(data, buf + header_len, data_len);
  3542. memmove(buf, buf + len, body_len - len);
  3543. conn->data_len -= len;
  3544. }
  3545. // Apply mask if necessary
  3546. if (mask_len > 0) {
  3547. for (i = 0; i < data_len; i++) {
  3548. data[i] ^= mask[i % 4];
  3549. }
  3550. }
  3551. // Exit the loop if callback signalled to exit,
  3552. // or "connection close" opcode received.
  3553. if ((bits & WEBSOCKET_OPCODE_CONNECTION_CLOSE) ||
  3554. (conn->ctx->callbacks.websocket_data != NULL &&
  3555. !conn->ctx->callbacks.websocket_data(conn, bits, data, data_len))) {
  3556. stop = 1;
  3557. }
  3558. if (data != mem) {
  3559. free(data);
  3560. }
  3561. // Not breaking the loop, process next websocket frame.
  3562. } else {
  3563. // Buffering websocket request
  3564. if ((n = pull(NULL, conn, conn->buf + conn->data_len,
  3565. conn->buf_size - conn->data_len)) <= 0) {
  3566. break;
  3567. }
  3568. conn->data_len += n;
  3569. }
  3570. }
  3571. }
  3572. int mg_websocket_write(struct mg_connection* conn, int opcode,
  3573. const char *data, size_t data_len) {
  3574. unsigned char *copy;
  3575. size_t copy_len = 0;
  3576. int retval = -1;
  3577. if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
  3578. return -1;
  3579. }
  3580. copy[0] = 0x80 + (opcode & 0x0f);
  3581. // Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
  3582. if (data_len < 126) {
  3583. // Inline 7-bit length field
  3584. copy[1] = data_len;
  3585. memcpy(copy + 2, data, data_len);
  3586. copy_len = 2 + data_len;
  3587. } else if (data_len <= 0xFFFF) {
  3588. // 16-bit length field
  3589. copy[1] = 126;
  3590. * (uint16_t *) (copy + 2) = htons(data_len);
  3591. memcpy(copy + 4, data, data_len);
  3592. copy_len = 4 + data_len;
  3593. } else {
  3594. // 64-bit length field
  3595. copy[1] = 127;
  3596. * (uint32_t *) (copy + 2) = htonl((uint64_t) data_len >> 32);
  3597. * (uint32_t *) (copy + 6) = htonl(data_len & 0xffffffff);
  3598. memcpy(copy + 10, data, data_len);
  3599. copy_len = 10 + data_len;
  3600. }
  3601. // Not thread safe
  3602. if (copy_len > 0) {
  3603. retval = mg_write(conn, copy, copy_len);
  3604. }
  3605. free(copy);
  3606. return retval;
  3607. }
  3608. static void handle_websocket_request(struct mg_connection *conn) {
  3609. const char *version = mg_get_header(conn, "Sec-WebSocket-Version");
  3610. if (version == NULL || strcmp(version, "13") != 0) {
  3611. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3612. } else if (conn->ctx->callbacks.websocket_connect != NULL &&
  3613. conn->ctx->callbacks.websocket_connect(conn) != 0) {
  3614. // Callback has returned non-zero, do not proceed with handshake
  3615. } else {
  3616. send_websocket_handshake(conn);
  3617. if (conn->ctx->callbacks.websocket_ready != NULL) {
  3618. conn->ctx->callbacks.websocket_ready(conn);
  3619. }
  3620. read_websocket(conn);
  3621. }
  3622. }
  3623. static int is_websocket_request(const struct mg_connection *conn) {
  3624. const char *host, *upgrade, *connection, *version, *key;
  3625. host = mg_get_header(conn, "Host");
  3626. upgrade = mg_get_header(conn, "Upgrade");
  3627. connection = mg_get_header(conn, "Connection");
  3628. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3629. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3630. return host != NULL && upgrade != NULL && connection != NULL &&
  3631. key != NULL && version != NULL &&
  3632. mg_strcasestr(upgrade, "websocket") != NULL &&
  3633. mg_strcasestr(connection, "Upgrade") != NULL;
  3634. }
  3635. #endif // !USE_WEBSOCKET
  3636. static int isbyte(int n) {
  3637. return n >= 0 && n <= 255;
  3638. }
  3639. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3640. int n, a, b, c, d, slash = 32, len = 0;
  3641. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3642. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3643. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3644. slash >= 0 && slash < 33) {
  3645. len = n;
  3646. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3647. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3648. }
  3649. return len;
  3650. }
  3651. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3652. int throttle = 0;
  3653. struct vec vec, val;
  3654. uint32_t net, mask;
  3655. char mult;
  3656. double v;
  3657. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3658. mult = ',';
  3659. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3660. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3661. continue;
  3662. }
  3663. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3664. if (vec.len == 1 && vec.ptr[0] == '*') {
  3665. throttle = (int) v;
  3666. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3667. if ((remote_ip & mask) == net) {
  3668. throttle = (int) v;
  3669. }
  3670. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3671. throttle = (int) v;
  3672. }
  3673. }
  3674. return throttle;
  3675. }
  3676. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3677. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3678. }
  3679. #ifdef USE_LUA
  3680. #include "mod_lua.c"
  3681. #endif // USE_LUA
  3682. int mg_upload(struct mg_connection *conn, const char *destination_dir) {
  3683. const char *content_type_header, *boundary_start;
  3684. char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
  3685. FILE *fp;
  3686. int bl, n, i, j, headers_len, boundary_len, eof,
  3687. len = 0, num_uploaded_files = 0;
  3688. // Request looks like this:
  3689. //
  3690. // POST /upload HTTP/1.1
  3691. // Host: 127.0.0.1:8080
  3692. // Content-Length: 244894
  3693. // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
  3694. //
  3695. // ------WebKitFormBoundaryRVr
  3696. // Content-Disposition: form-data; name="file"; filename="accum.png"
  3697. // Content-Type: image/png
  3698. //
  3699. // <89>PNG
  3700. // <PNG DATA>
  3701. // ------WebKitFormBoundaryRVr
  3702. // Extract boundary string from the Content-Type header
  3703. if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
  3704. (boundary_start = mg_strcasestr(content_type_header,
  3705. "boundary=")) == NULL ||
  3706. (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
  3707. sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
  3708. boundary[0] == '\0') {
  3709. return num_uploaded_files;
  3710. }
  3711. boundary_len = strlen(boundary);
  3712. bl = boundary_len + 4; // \r\n--<boundary>
  3713. for (;;) {
  3714. // Pull in headers
  3715. assert(len >= 0 && len <= (int) sizeof(buf));
  3716. while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
  3717. len += n;
  3718. }
  3719. if ((headers_len = get_request_len(buf, len)) <= 0) {
  3720. break;
  3721. }
  3722. // Fetch file name.
  3723. fname[0] = '\0';
  3724. for (i = j = 0; i < headers_len; i++) {
  3725. if (buf[i] == '\r' && buf[i + 1] == '\n') {
  3726. buf[i] = buf[i + 1] = '\0';
  3727. // TODO(lsm): don't expect filename to be the 3rd field,
  3728. // parse the header properly instead.
  3729. sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
  3730. fname);
  3731. j = i + 2;
  3732. }
  3733. }
  3734. // Give up if the headers are not what we expect
  3735. if (fname[0] == '\0') {
  3736. break;
  3737. }
  3738. // Move data to the beginning of the buffer
  3739. assert(len >= headers_len);
  3740. memmove(buf, &buf[headers_len], len - headers_len);
  3741. len -= headers_len;
  3742. // We open the file with exclusive lock held. This guarantee us
  3743. // there is no other thread can save into the same file simultaneously.
  3744. fp = NULL;
  3745. // Construct destination file name. Do not allow paths to have slashes.
  3746. if ((s = strrchr(fname, '/')) == NULL &&
  3747. (s = strrchr(fname, '\\')) == NULL) {
  3748. s = fname;
  3749. }
  3750. // Open file in binary mode. TODO: set an exclusive lock.
  3751. snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
  3752. if ((fp = fopen(path, "wb")) == NULL) {
  3753. break;
  3754. }
  3755. // Read POST data, write into file until boundary is found.
  3756. eof = n = 0;
  3757. do {
  3758. len += n;
  3759. for (i = 0; i < len - bl; i++) {
  3760. if (!memcmp(&buf[i], "\r\n--", 4) &&
  3761. !memcmp(&buf[i + 4], boundary, boundary_len)) {
  3762. // Found boundary, that's the end of file data.
  3763. fwrite(buf, 1, i, fp);
  3764. eof = 1;
  3765. memmove(buf, &buf[i + bl], len - (i + bl));
  3766. len -= i + bl;
  3767. break;
  3768. }
  3769. }
  3770. if (!eof && len > bl) {
  3771. fwrite(buf, 1, len - bl, fp);
  3772. memmove(buf, &buf[len - bl], bl);
  3773. len = bl;
  3774. }
  3775. } while (!eof && (n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
  3776. fclose(fp);
  3777. if (eof) {
  3778. num_uploaded_files++;
  3779. if (conn->ctx->callbacks.upload != NULL) {
  3780. conn->ctx->callbacks.upload(conn, path);
  3781. }
  3782. }
  3783. }
  3784. return num_uploaded_files;
  3785. }
  3786. static int is_put_or_delete_request(const struct mg_connection *conn) {
  3787. const char *s = conn->request_info.request_method;
  3788. return s != NULL && (!strcmp(s, "PUT") ||
  3789. !strcmp(s, "DELETE") ||
  3790. !strcmp(s, "MKCOL"));
  3791. }
  3792. static int get_first_ssl_listener_index(const struct mg_context *ctx) {
  3793. int i, index = -1;
  3794. for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
  3795. index = ctx->listening_sockets[i].is_ssl ? i : -1;
  3796. }
  3797. return index;
  3798. }
  3799. static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
  3800. char host[1025];
  3801. const char *host_header;
  3802. if ((host_header = mg_get_header(conn, "Host")) == NULL ||
  3803. sscanf(host_header, "%1024[^:]", host) == 0) {
  3804. // Cannot get host from the Host: header. Fallback to our IP address.
  3805. sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
  3806. }
  3807. mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
  3808. host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
  3809. lsa.sin.sin_port), conn->request_info.uri);
  3810. }
  3811. // This is the heart of the Mongoose's logic.
  3812. // This function is called when the request is read, parsed and validated,
  3813. // and Mongoose must decide what action to take: serve a file, or
  3814. // a directory, or call embedded function, etcetera.
  3815. static void handle_request(struct mg_connection *conn) {
  3816. struct mg_request_info *ri = &conn->request_info;
  3817. char path[PATH_MAX];
  3818. int uri_len, ssl_index;
  3819. struct file file = STRUCT_FILE_INITIALIZER;
  3820. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3821. * ((char *) conn->request_info.query_string++) = '\0';
  3822. }
  3823. uri_len = (int) strlen(ri->uri);
  3824. mg_url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
  3825. remove_double_dots_and_double_slashes((char *) ri->uri);
  3826. convert_uri_to_file_name(conn, path, sizeof(path), &file);
  3827. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3828. get_remote_ip(conn), ri->uri);
  3829. DEBUG_TRACE(("%s", ri->uri));
  3830. // Perform redirect and auth checks before calling begin_request() handler.
  3831. // Otherwise, begin_request() would need to perform auth checks and redirects.
  3832. if (!conn->client.is_ssl && conn->client.ssl_redir &&
  3833. (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
  3834. redirect_to_https_port(conn, ssl_index);
  3835. } else if (!is_put_or_delete_request(conn) &&
  3836. !check_authorization(conn, path)) {
  3837. send_authorization_request(conn);
  3838. } else if (conn->ctx->callbacks.begin_request != NULL &&
  3839. conn->ctx->callbacks.begin_request(conn)) {
  3840. // Do nothing, callback has served the request
  3841. #if defined(USE_WEBSOCKET)
  3842. } else if (is_websocket_request(conn)) {
  3843. handle_websocket_request(conn);
  3844. #endif
  3845. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3846. send_options(conn);
  3847. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3848. send_http_error(conn, 404, "Not Found", "Not Found");
  3849. } else if (is_put_or_delete_request(conn) &&
  3850. (is_authorized_for_put(conn) != 1)) {
  3851. send_authorization_request(conn);
  3852. } else if (!strcmp(ri->request_method, "PUT")) {
  3853. put_file(conn, path);
  3854. } else if (!strcmp(ri->request_method, "MKCOL")) {
  3855. mkcol(conn, path);
  3856. } else if (!strcmp(ri->request_method, "DELETE")) {
  3857. struct de de;
  3858. memset(&de.file, 0, sizeof(de.file));
  3859. if(!mg_stat(conn, path, &de.file)) {
  3860. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3861. } else {
  3862. if(de.file.modification_time) {
  3863. if(de.file.is_directory) {
  3864. remove_directory(conn, path);
  3865. send_http_error(conn, 204, "No Content", "%s", "");
  3866. } else if (mg_remove(path) == 0) {
  3867. send_http_error(conn, 204, "No Content", "%s", "");
  3868. } else {
  3869. send_http_error(conn, 423, "Locked", "remove(%s): %s", path,
  3870. strerror(ERRNO));
  3871. }
  3872. }
  3873. else {
  3874. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3875. strerror(ERRNO));
  3876. }
  3877. }
  3878. } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
  3879. must_hide_file(conn, path)) {
  3880. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3881. } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
  3882. mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3883. "Location: %s/\r\n\r\n", ri->uri);
  3884. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3885. handle_propfind(conn, path, &file);
  3886. } else if (file.is_directory &&
  3887. !substitute_index_file(conn, path, sizeof(path), &file)) {
  3888. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3889. handle_directory_request(conn, path);
  3890. } else {
  3891. send_http_error(conn, 403, "Directory Listing Denied",
  3892. "Directory listing denied");
  3893. }
  3894. #ifdef USE_LUA
  3895. } else if (match_prefix("**.lp$", 6, path) > 0) {
  3896. handle_lsp_request(conn, path, &file, NULL);
  3897. #endif
  3898. #if !defined(NO_CGI)
  3899. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3900. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3901. path) > 0) {
  3902. if (strcmp(ri->request_method, "POST") &&
  3903. strcmp(ri->request_method, "HEAD") &&
  3904. strcmp(ri->request_method, "GET")) {
  3905. send_http_error(conn, 501, "Not Implemented",
  3906. "Method %s is not implemented", ri->request_method);
  3907. } else {
  3908. handle_cgi_request(conn, path);
  3909. }
  3910. #endif // !NO_CGI
  3911. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3912. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3913. path) > 0) {
  3914. handle_ssi_file_request(conn, path);
  3915. } else if (is_not_modified(conn, &file)) {
  3916. send_http_error(conn, 304, "Not Modified", "%s", "");
  3917. } else {
  3918. handle_file_request(conn, path, &file);
  3919. }
  3920. }
  3921. static void close_all_listening_sockets(struct mg_context *ctx) {
  3922. int i;
  3923. for (i = 0; i < ctx->num_listening_sockets; i++) {
  3924. closesocket(ctx->listening_sockets[i].sock);
  3925. }
  3926. free(ctx->listening_sockets);
  3927. }
  3928. static int is_valid_port(unsigned int port) {
  3929. return port > 0 && port < 0xffff;
  3930. }
  3931. // Valid listening port specification is: [ip_address:]port[s]
  3932. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3933. // TODO(lsm): add parsing of the IPv6 address
  3934. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3935. unsigned int a, b, c, d, ch, len, port;
  3936. #if defined(USE_IPV6)
  3937. char buf[100];
  3938. #endif
  3939. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3940. // Also, all-zeroes in the socket address means binding to all addresses
  3941. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3942. memset(so, 0, sizeof(*so));
  3943. so->lsa.sin.sin_family = AF_INET;
  3944. if (sscanf(vec->ptr, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
  3945. // Bind to a specific IPv4 address, e.g. 192.168.1.5:8080
  3946. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3947. so->lsa.sin.sin_port = htons((uint16_t) port);
  3948. #if defined(USE_IPV6)
  3949. } else if (sscanf(vec->ptr, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
  3950. inet_pton(AF_INET6, buf, &so->lsa.sin6.sin6_addr)) {
  3951. // IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080
  3952. so->lsa.sin6.sin6_family = AF_INET6;
  3953. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3954. #endif
  3955. } else if (sscanf(vec->ptr, "%u%n", &port, &len) == 1) {
  3956. // If only port is specified, bind to IPv4, INADDR_ANY
  3957. so->lsa.sin.sin_port = htons((uint16_t) port);
  3958. } else {
  3959. port = len = 0; // Parsing failure. Make port invalid.
  3960. }
  3961. ch = vec->ptr[len]; // Next character after the port number
  3962. so->is_ssl = ch == 's';
  3963. so->ssl_redir = ch == 'r';
  3964. // Make sure the port is valid and vector ends with 's', 'r' or ','
  3965. return is_valid_port(port) &&
  3966. (ch == '\0' || ch == 's' || ch == 'r' || ch == ',');
  3967. }
  3968. static int set_ports_option(struct mg_context *ctx) {
  3969. const char *list = ctx->config[LISTENING_PORTS];
  3970. int on = 1, success = 1;
  3971. #if defined(USE_IPV6)
  3972. int off = 0;
  3973. #endif
  3974. struct vec vec;
  3975. struct socket so, *ptr;
  3976. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3977. if (!parse_port_string(&vec, &so)) {
  3978. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3979. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|r]");
  3980. success = 0;
  3981. } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
  3982. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3983. success = 0;
  3984. } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3985. INVALID_SOCKET ||
  3986. // On Windows, SO_REUSEADDR is recommended only for
  3987. // broadcast UDP sockets
  3988. setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
  3989. (void *) &on, sizeof(on)) != 0 ||
  3990. #if defined(USE_IPV6)
  3991. (so.lsa.sa.sa_family == AF_INET6 &&
  3992. setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
  3993. sizeof(off)) != 0) ||
  3994. #endif
  3995. bind(so.sock, &so.lsa.sa, so.lsa.sa.sa_family == AF_INET ?
  3996. sizeof(so.lsa.sin) : sizeof(so.lsa)) != 0 ||
  3997. listen(so.sock, SOMAXCONN) != 0) {
  3998. cry(fc(ctx), "%s: cannot bind to %.*s: %d (%s)", __func__,
  3999. (int) vec.len, vec.ptr, ERRNO, strerror(errno));
  4000. closesocket(so.sock);
  4001. success = 0;
  4002. } else if ((ptr = (struct socket *) realloc(ctx->listening_sockets,
  4003. (ctx->num_listening_sockets + 1) *
  4004. sizeof(ctx->listening_sockets[0]))) == NULL) {
  4005. closesocket(so.sock);
  4006. success = 0;
  4007. } else {
  4008. set_close_on_exec(so.sock);
  4009. ctx->listening_sockets = ptr;
  4010. ctx->listening_sockets[ctx->num_listening_sockets] = so;
  4011. ctx->num_listening_sockets++;
  4012. }
  4013. }
  4014. if (!success) {
  4015. close_all_listening_sockets(ctx);
  4016. }
  4017. return success;
  4018. }
  4019. static void log_header(const struct mg_connection *conn, const char *header,
  4020. FILE *fp) {
  4021. const char *header_value;
  4022. if ((header_value = mg_get_header(conn, header)) == NULL) {
  4023. (void) fprintf(fp, "%s", " -");
  4024. } else {
  4025. (void) fprintf(fp, " \"%s\"", header_value);
  4026. }
  4027. }
  4028. static void log_access(const struct mg_connection *conn) {
  4029. const struct mg_request_info *ri;
  4030. FILE *fp;
  4031. char date[64], src_addr[IP_ADDR_STR_LEN];
  4032. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  4033. fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  4034. if (fp == NULL)
  4035. return;
  4036. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  4037. localtime(&conn->birth_time));
  4038. ri = &conn->request_info;
  4039. flockfile(fp);
  4040. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  4041. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  4042. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  4043. ri->request_method ? ri->request_method : "-",
  4044. ri->uri ? ri->uri : "-", ri->http_version,
  4045. conn->status_code, conn->num_bytes_sent);
  4046. log_header(conn, "Referer", fp);
  4047. log_header(conn, "User-Agent", fp);
  4048. fputc('\n', fp);
  4049. fflush(fp);
  4050. funlockfile(fp);
  4051. fclose(fp);
  4052. }
  4053. // Verify given socket address against the ACL.
  4054. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  4055. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  4056. int allowed, flag;
  4057. uint32_t net, mask;
  4058. struct vec vec;
  4059. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  4060. // If any ACL is set, deny by default
  4061. allowed = list == NULL ? '+' : '-';
  4062. while ((list = next_option(list, &vec, NULL)) != NULL) {
  4063. flag = vec.ptr[0];
  4064. if ((flag != '+' && flag != '-') ||
  4065. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  4066. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  4067. return -1;
  4068. }
  4069. if (net == (remote_ip & mask)) {
  4070. allowed = flag;
  4071. }
  4072. }
  4073. return allowed == '+';
  4074. }
  4075. #if !defined(_WIN32)
  4076. static int set_uid_option(struct mg_context *ctx) {
  4077. struct passwd *pw;
  4078. const char *uid = ctx->config[RUN_AS_USER];
  4079. int success = 0;
  4080. if (uid == NULL) {
  4081. success = 1;
  4082. } else {
  4083. if ((pw = getpwnam(uid)) == NULL) {
  4084. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  4085. } else if (setgid(pw->pw_gid) == -1) {
  4086. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  4087. } else if (setuid(pw->pw_uid) == -1) {
  4088. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  4089. } else {
  4090. success = 1;
  4091. }
  4092. }
  4093. return success;
  4094. }
  4095. #endif // !_WIN32
  4096. #if !defined(NO_SSL)
  4097. static pthread_mutex_t *ssl_mutexes;
  4098. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  4099. return (conn->ssl = SSL_new(s)) != NULL &&
  4100. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  4101. func(conn->ssl) == 1;
  4102. }
  4103. // Return OpenSSL error message
  4104. static const char *ssl_error(void) {
  4105. unsigned long err;
  4106. err = ERR_get_error();
  4107. return err == 0 ? "" : ERR_error_string(err, NULL);
  4108. }
  4109. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  4110. int line) {
  4111. (void) line;
  4112. (void) file;
  4113. if (mode & 1) { // 1 is CRYPTO_LOCK
  4114. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  4115. } else {
  4116. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  4117. }
  4118. }
  4119. static unsigned long ssl_id_callback(void) {
  4120. return (unsigned long) pthread_self();
  4121. }
  4122. #if !defined(NO_SSL_DL)
  4123. static int load_dll(struct mg_context *ctx, const char *dll_name,
  4124. struct ssl_func *sw) {
  4125. union {void *p; void (*fp)(void);} u;
  4126. void *dll_handle;
  4127. struct ssl_func *fp;
  4128. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  4129. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  4130. return 0;
  4131. }
  4132. for (fp = sw; fp->name != NULL; fp++) {
  4133. #ifdef _WIN32
  4134. // GetProcAddress() returns pointer to function
  4135. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  4136. #else
  4137. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  4138. // function pointers. We need to use a union to make a cast.
  4139. u.p = dlsym(dll_handle, fp->name);
  4140. #endif // _WIN32
  4141. if (u.fp == NULL) {
  4142. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  4143. return 0;
  4144. } else {
  4145. fp->ptr = u.fp;
  4146. }
  4147. }
  4148. return 1;
  4149. }
  4150. #endif // NO_SSL_DL
  4151. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  4152. static int set_ssl_option(struct mg_context *ctx) {
  4153. int i, size;
  4154. const char *pem;
  4155. // If PEM file is not specified and the init_ssl callback
  4156. // is not specified, skip SSL initialization.
  4157. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL &&
  4158. ctx->callbacks.init_ssl == NULL) {
  4159. return 1;
  4160. }
  4161. #if !defined(NO_SSL_DL)
  4162. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  4163. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  4164. return 0;
  4165. }
  4166. #endif // NO_SSL_DL
  4167. // Initialize SSL library
  4168. SSL_library_init();
  4169. SSL_load_error_strings();
  4170. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  4171. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  4172. return 0;
  4173. }
  4174. // If user callback returned non-NULL, that means that user callback has
  4175. // set up certificate itself. In this case, skip sertificate setting.
  4176. if ((ctx->callbacks.init_ssl == NULL ||
  4177. !ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
  4178. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
  4179. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
  4180. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  4181. return 0;
  4182. }
  4183. if (pem != NULL) {
  4184. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  4185. }
  4186. // Initialize locking callbacks, needed for thread safety.
  4187. // http://www.openssl.org/support/faq.html#PROG1
  4188. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  4189. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  4190. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  4191. return 0;
  4192. }
  4193. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4194. pthread_mutex_init(&ssl_mutexes[i], NULL);
  4195. }
  4196. CRYPTO_set_locking_callback(&ssl_locking_callback);
  4197. CRYPTO_set_id_callback(&ssl_id_callback);
  4198. return 1;
  4199. }
  4200. static void uninitialize_ssl(struct mg_context *ctx) {
  4201. int i;
  4202. if (ctx->ssl_ctx != NULL) {
  4203. CRYPTO_set_locking_callback(NULL);
  4204. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4205. pthread_mutex_destroy(&ssl_mutexes[i]);
  4206. }
  4207. CRYPTO_set_locking_callback(NULL);
  4208. CRYPTO_set_id_callback(NULL);
  4209. }
  4210. }
  4211. #endif // !NO_SSL
  4212. static int set_gpass_option(struct mg_context *ctx) {
  4213. struct file file = STRUCT_FILE_INITIALIZER;
  4214. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  4215. if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
  4216. cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
  4217. return 0;
  4218. }
  4219. return 1;
  4220. }
  4221. static int set_acl_option(struct mg_context *ctx) {
  4222. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  4223. }
  4224. static void reset_per_request_attributes(struct mg_connection *conn) {
  4225. conn->path_info = NULL;
  4226. conn->num_bytes_sent = conn->consumed_content = 0;
  4227. conn->status_code = -1;
  4228. conn->must_close = conn->request_len = conn->throttle = 0;
  4229. }
  4230. static void close_socket_gracefully(struct mg_connection *conn) {
  4231. #if defined(_WIN32)
  4232. char buf[MG_BUF_LEN];
  4233. int n;
  4234. #endif
  4235. struct linger linger;
  4236. // Set linger option to avoid socket hanging out after close. This prevent
  4237. // ephemeral port exhaust problem under high QPS.
  4238. linger.l_onoff = 1;
  4239. linger.l_linger = 1;
  4240. setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
  4241. (char *) &linger, sizeof(linger));
  4242. // Send FIN to the client
  4243. shutdown(conn->client.sock, SHUT_WR);
  4244. set_non_blocking_mode(conn->client.sock);
  4245. #if defined(_WIN32)
  4246. // Read and discard pending incoming data. If we do not do that and close the
  4247. // socket, the data in the send buffer may be discarded. This
  4248. // behaviour is seen on Windows, when client keeps sending data
  4249. // when server decides to close the connection; then when client
  4250. // does recv() it gets no data back.
  4251. do {
  4252. n = pull(NULL, conn, buf, sizeof(buf));
  4253. } while (n > 0);
  4254. #endif
  4255. // Now we know that our FIN is ACK-ed, safe to close
  4256. closesocket(conn->client.sock);
  4257. }
  4258. static void close_connection(struct mg_connection *conn) {
  4259. conn->must_close = 1;
  4260. #ifndef NO_SSL
  4261. if (conn->ssl != NULL) {
  4262. // Run SSL_shutdown twice to ensure completly close SSL connection
  4263. SSL_shutdown(conn->ssl);
  4264. SSL_free(conn->ssl);
  4265. conn->ssl = NULL;
  4266. }
  4267. #endif
  4268. if (conn->client.sock != INVALID_SOCKET) {
  4269. close_socket_gracefully(conn);
  4270. conn->client.sock = INVALID_SOCKET;
  4271. }
  4272. }
  4273. void mg_close_connection(struct mg_connection *conn) {
  4274. #ifndef NO_SSL
  4275. if (conn->client_ssl_ctx != NULL) {
  4276. SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
  4277. }
  4278. #endif
  4279. close_connection(conn);
  4280. free(conn);
  4281. }
  4282. struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
  4283. char *ebuf, size_t ebuf_len) {
  4284. static struct mg_context fake_ctx;
  4285. struct mg_connection *conn = NULL;
  4286. SOCKET sock;
  4287. if ((sock = conn2(host, port, use_ssl, ebuf, ebuf_len)) == INVALID_SOCKET) {
  4288. } else if ((conn = (struct mg_connection *)
  4289. calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
  4290. snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
  4291. closesocket(sock);
  4292. #ifndef NO_SSL
  4293. } else if (use_ssl && (conn->client_ssl_ctx =
  4294. SSL_CTX_new(SSLv23_client_method())) == NULL) {
  4295. snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
  4296. closesocket(sock);
  4297. free(conn);
  4298. conn = NULL;
  4299. #endif // NO_SSL
  4300. } else {
  4301. socklen_t len = sizeof(struct sockaddr);
  4302. conn->buf_size = MAX_REQUEST_SIZE;
  4303. conn->buf = (char *) (conn + 1);
  4304. conn->ctx = &fake_ctx;
  4305. conn->client.sock = sock;
  4306. getsockname(sock, &conn->client.rsa.sa, &len);
  4307. conn->client.is_ssl = use_ssl;
  4308. #ifndef NO_SSL
  4309. if (use_ssl) {
  4310. // SSL_CTX_set_verify call is needed to switch off server certificate
  4311. // checking, which is off by default in OpenSSL and on in yaSSL.
  4312. SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
  4313. sslize(conn, conn->client_ssl_ctx, SSL_connect);
  4314. }
  4315. #endif
  4316. }
  4317. return conn;
  4318. }
  4319. static int is_valid_uri(const char *uri) {
  4320. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  4321. // URI can be an asterisk (*) or should start with slash.
  4322. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  4323. }
  4324. static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
  4325. const char *cl;
  4326. ebuf[0] = '\0';
  4327. reset_per_request_attributes(conn);
  4328. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  4329. &conn->data_len);
  4330. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  4331. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  4332. snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
  4333. } else if (conn->request_len <= 0) {
  4334. snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
  4335. } else if (parse_http_message(conn->buf, conn->buf_size,
  4336. &conn->request_info) <= 0) {
  4337. snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
  4338. } else {
  4339. // Request is valid
  4340. if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
  4341. conn->content_len = strtoll(cl, NULL, 10);
  4342. } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
  4343. !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
  4344. conn->content_len = -1;
  4345. } else {
  4346. conn->content_len = 0;
  4347. }
  4348. conn->birth_time = time(NULL);
  4349. }
  4350. return ebuf[0] == '\0';
  4351. }
  4352. struct mg_connection *mg_download(const char *host, int port, int use_ssl,
  4353. char *ebuf, size_t ebuf_len,
  4354. const char *fmt, ...) {
  4355. struct mg_connection *conn;
  4356. va_list ap;
  4357. va_start(ap, fmt);
  4358. ebuf[0] = '\0';
  4359. if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
  4360. } else if (mg_vprintf(conn, fmt, ap) <= 0) {
  4361. snprintf(ebuf, ebuf_len, "%s", "Error sending request");
  4362. } else {
  4363. getreq(conn, ebuf, ebuf_len);
  4364. }
  4365. if (ebuf[0] != '\0' && conn != NULL) {
  4366. mg_close_connection(conn);
  4367. conn = NULL;
  4368. }
  4369. return conn;
  4370. }
  4371. static void process_new_connection(struct mg_connection *conn) {
  4372. struct mg_request_info *ri = &conn->request_info;
  4373. int keep_alive_enabled, keep_alive, discard_len;
  4374. char ebuf[100];
  4375. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  4376. keep_alive = 0;
  4377. // Important: on new connection, reset the receiving buffer. Credit goes
  4378. // to crule42.
  4379. conn->data_len = 0;
  4380. do {
  4381. if (!getreq(conn, ebuf, sizeof(ebuf))) {
  4382. send_http_error(conn, 500, "Server Error", "%s", ebuf);
  4383. conn->must_close = 1;
  4384. } else if (!is_valid_uri(conn->request_info.uri)) {
  4385. snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
  4386. send_http_error(conn, 400, "Bad Request", "%s", ebuf);
  4387. } else if (strcmp(ri->http_version, "1.0") &&
  4388. strcmp(ri->http_version, "1.1")) {
  4389. snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
  4390. send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
  4391. }
  4392. if (ebuf[0] == '\0') {
  4393. handle_request(conn);
  4394. if (conn->ctx->callbacks.end_request != NULL) {
  4395. conn->ctx->callbacks.end_request(conn, conn->status_code);
  4396. }
  4397. log_access(conn);
  4398. }
  4399. if (ri->remote_user != NULL) {
  4400. free((void *) ri->remote_user);
  4401. // Important! When having connections with and without auth
  4402. // would cause double free and then crash
  4403. ri->remote_user = NULL;
  4404. }
  4405. // NOTE(lsm): order is important here. should_keep_alive() call
  4406. // is using parsed request, which will be invalid after memmove's below.
  4407. // Therefore, memorize should_keep_alive() result now for later use
  4408. // in loop exit condition.
  4409. keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
  4410. conn->content_len >= 0 && should_keep_alive(conn);
  4411. // Discard all buffered data for this request
  4412. discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
  4413. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  4414. (int) (conn->request_len + conn->content_len) : conn->data_len;
  4415. assert(discard_len >= 0);
  4416. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  4417. conn->data_len -= discard_len;
  4418. assert(conn->data_len >= 0);
  4419. assert(conn->data_len <= conn->buf_size);
  4420. } while (keep_alive);
  4421. }
  4422. // Worker threads take accepted socket from the queue
  4423. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  4424. (void) pthread_mutex_lock(&ctx->mutex);
  4425. DEBUG_TRACE(("going idle"));
  4426. // If the queue is empty, wait. We're idle at this point.
  4427. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  4428. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  4429. }
  4430. // If we're stopping, sq_head may be equal to sq_tail.
  4431. if (ctx->sq_head > ctx->sq_tail) {
  4432. // Copy socket from the queue and increment tail
  4433. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  4434. ctx->sq_tail++;
  4435. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  4436. // Wrap pointers if needed
  4437. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  4438. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  4439. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  4440. }
  4441. }
  4442. (void) pthread_cond_signal(&ctx->sq_empty);
  4443. (void) pthread_mutex_unlock(&ctx->mutex);
  4444. return !ctx->stop_flag;
  4445. }
  4446. static void *worker_thread(void *thread_func_param) {
  4447. struct mg_context *ctx = (struct mg_context *) thread_func_param;
  4448. struct mg_connection *conn;
  4449. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  4450. if (conn == NULL) {
  4451. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  4452. } else {
  4453. conn->buf_size = MAX_REQUEST_SIZE;
  4454. conn->buf = (char *) (conn + 1);
  4455. conn->ctx = ctx;
  4456. conn->request_info.user_data = ctx->user_data;
  4457. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  4458. // sq_empty condvar to wake up the master waiting in produce_socket()
  4459. while (consume_socket(ctx, &conn->client)) {
  4460. conn->birth_time = time(NULL);
  4461. // Fill in IP, port info early so even if SSL setup below fails,
  4462. // error handler would have the corresponding info.
  4463. // Thanks to Johannes Winkelmann for the patch.
  4464. // TODO(lsm): Fix IPv6 case
  4465. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  4466. memcpy(&conn->request_info.remote_ip,
  4467. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  4468. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  4469. conn->request_info.is_ssl = conn->client.is_ssl;
  4470. if (!conn->client.is_ssl
  4471. #ifndef NO_SSL
  4472. || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
  4473. #endif
  4474. ) {
  4475. process_new_connection(conn);
  4476. }
  4477. close_connection(conn);
  4478. }
  4479. free(conn);
  4480. }
  4481. // Signal master that we're done with connection and exiting
  4482. (void) pthread_mutex_lock(&ctx->mutex);
  4483. ctx->num_threads--;
  4484. (void) pthread_cond_signal(&ctx->cond);
  4485. assert(ctx->num_threads >= 0);
  4486. (void) pthread_mutex_unlock(&ctx->mutex);
  4487. DEBUG_TRACE(("exiting"));
  4488. return NULL;
  4489. }
  4490. // Master thread adds accepted socket to a queue
  4491. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  4492. (void) pthread_mutex_lock(&ctx->mutex);
  4493. // If the queue is full, wait
  4494. while (ctx->stop_flag == 0 &&
  4495. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  4496. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  4497. }
  4498. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  4499. // Copy socket to the queue and increment head
  4500. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  4501. ctx->sq_head++;
  4502. DEBUG_TRACE(("queued socket %d", sp->sock));
  4503. }
  4504. (void) pthread_cond_signal(&ctx->sq_full);
  4505. (void) pthread_mutex_unlock(&ctx->mutex);
  4506. }
  4507. static int set_sock_timeout(SOCKET sock, int milliseconds) {
  4508. #ifdef _WIN32
  4509. DWORD t = milliseconds;
  4510. #else
  4511. struct timeval t;
  4512. t.tv_sec = milliseconds / 1000;
  4513. t.tv_usec = (milliseconds * 1000) % 1000000;
  4514. #endif
  4515. return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
  4516. setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
  4517. }
  4518. static void accept_new_connection(const struct socket *listener,
  4519. struct mg_context *ctx) {
  4520. struct socket so;
  4521. char src_addr[IP_ADDR_STR_LEN];
  4522. socklen_t len = sizeof(so.rsa);
  4523. int on = 1;
  4524. if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
  4525. } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
  4526. sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
  4527. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  4528. closesocket(so.sock);
  4529. } else {
  4530. // Put so socket structure into the queue
  4531. DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
  4532. set_close_on_exec(so.sock);
  4533. so.is_ssl = listener->is_ssl;
  4534. so.ssl_redir = listener->ssl_redir;
  4535. getsockname(so.sock, &so.lsa.sa, &len);
  4536. // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
  4537. // is enabled, and client resets the connection, server won't get
  4538. // TCP FIN or RST and will keep the connection open forever. With TCP
  4539. // keep-alive, next keep-alive handshake will figure out that the client
  4540. // is down and will close the server end.
  4541. // Thanks to Igor Klopov who suggested the patch.
  4542. setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
  4543. set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
  4544. produce_socket(ctx, &so);
  4545. }
  4546. }
  4547. static void *master_thread(void *thread_func_param) {
  4548. struct mg_context *ctx = (struct mg_context *) thread_func_param;
  4549. struct pollfd *pfd;
  4550. int i;
  4551. // Increase priority of the master thread
  4552. #if defined(_WIN32)
  4553. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  4554. #endif
  4555. #if defined(ISSUE_317)
  4556. struct sched_param sched_param;
  4557. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  4558. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  4559. #endif
  4560. pfd = (struct pollfd *) calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
  4561. while (pfd != NULL && ctx->stop_flag == 0) {
  4562. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4563. pfd[i].fd = ctx->listening_sockets[i].sock;
  4564. pfd[i].events = POLLIN;
  4565. }
  4566. if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
  4567. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4568. // NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
  4569. // successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
  4570. // Therefore, we're checking pfd[i].revents & POLLIN, not
  4571. // pfd[i].revents == POLLIN.
  4572. if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
  4573. accept_new_connection(&ctx->listening_sockets[i], ctx);
  4574. }
  4575. }
  4576. }
  4577. }
  4578. free(pfd);
  4579. DEBUG_TRACE(("stopping workers"));
  4580. // Stop signal received: somebody called mg_stop. Quit.
  4581. close_all_listening_sockets(ctx);
  4582. // Wakeup workers that are waiting for connections to handle.
  4583. pthread_cond_broadcast(&ctx->sq_full);
  4584. // Wait until all threads finish
  4585. (void) pthread_mutex_lock(&ctx->mutex);
  4586. while (ctx->num_threads > 0) {
  4587. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4588. }
  4589. (void) pthread_mutex_unlock(&ctx->mutex);
  4590. // All threads exited, no sync is needed. Destroy mutex and condvars
  4591. (void) pthread_mutex_destroy(&ctx->mutex);
  4592. (void) pthread_cond_destroy(&ctx->cond);
  4593. (void) pthread_cond_destroy(&ctx->sq_empty);
  4594. (void) pthread_cond_destroy(&ctx->sq_full);
  4595. #if !defined(NO_SSL)
  4596. uninitialize_ssl(ctx);
  4597. #endif
  4598. DEBUG_TRACE(("exiting"));
  4599. // Signal mg_stop() that we're done.
  4600. // WARNING: This must be the very last thing this
  4601. // thread does, as ctx becomes invalid after this line.
  4602. ctx->stop_flag = 2;
  4603. return NULL;
  4604. }
  4605. static void free_context(struct mg_context *ctx) {
  4606. int i;
  4607. // Deallocate config parameters
  4608. for (i = 0; i < NUM_OPTIONS; i++) {
  4609. if (ctx->config[i] != NULL)
  4610. free(ctx->config[i]);
  4611. }
  4612. #ifndef NO_SSL
  4613. // Deallocate SSL context
  4614. if (ctx->ssl_ctx != NULL) {
  4615. SSL_CTX_free(ctx->ssl_ctx);
  4616. }
  4617. if (ssl_mutexes != NULL) {
  4618. free(ssl_mutexes);
  4619. ssl_mutexes = NULL;
  4620. }
  4621. #endif // !NO_SSL
  4622. // Deallocate context itself
  4623. free(ctx);
  4624. }
  4625. void mg_stop(struct mg_context *ctx) {
  4626. ctx->stop_flag = 1;
  4627. // Wait until mg_fini() stops
  4628. while (ctx->stop_flag != 2) {
  4629. (void) mg_sleep(10);
  4630. }
  4631. free_context(ctx);
  4632. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4633. (void) WSACleanup();
  4634. #endif // _WIN32
  4635. }
  4636. struct mg_context *mg_start(const struct mg_callbacks *callbacks,
  4637. void *user_data,
  4638. const char **options) {
  4639. struct mg_context *ctx;
  4640. const char *name, *value, *default_value;
  4641. int i;
  4642. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4643. WSADATA data;
  4644. WSAStartup(MAKEWORD(2,2), &data);
  4645. InitializeCriticalSection(&global_log_file_lock);
  4646. #endif // _WIN32
  4647. // Allocate context and initialize reasonable general case defaults.
  4648. // TODO(lsm): do proper error handling here.
  4649. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4650. return NULL;
  4651. }
  4652. ctx->callbacks = *callbacks;
  4653. ctx->user_data = user_data;
  4654. while (options && (name = *options++) != NULL) {
  4655. if ((i = get_option_index(name)) == -1) {
  4656. cry(fc(ctx), "Invalid option: %s", name);
  4657. free_context(ctx);
  4658. return NULL;
  4659. } else if ((value = *options++) == NULL) {
  4660. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4661. free_context(ctx);
  4662. return NULL;
  4663. }
  4664. if (ctx->config[i] != NULL) {
  4665. cry(fc(ctx), "warning: %s: duplicate option", name);
  4666. free(ctx->config[i]);
  4667. }
  4668. ctx->config[i] = mg_strdup(value);
  4669. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4670. }
  4671. // Set default value if needed
  4672. for (i = 0; config_options[i * 2] != NULL; i++) {
  4673. default_value = config_options[i * 2 + 1];
  4674. if (ctx->config[i] == NULL && default_value != NULL) {
  4675. ctx->config[i] = mg_strdup(default_value);
  4676. }
  4677. }
  4678. // NOTE(lsm): order is important here. SSL certificates must
  4679. // be initialized before listening ports. UID must be set last.
  4680. if (!set_gpass_option(ctx) ||
  4681. #if !defined(NO_SSL)
  4682. !set_ssl_option(ctx) ||
  4683. #endif
  4684. !set_ports_option(ctx) ||
  4685. #if !defined(_WIN32)
  4686. !set_uid_option(ctx) ||
  4687. #endif
  4688. !set_acl_option(ctx)) {
  4689. free_context(ctx);
  4690. return NULL;
  4691. }
  4692. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4693. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4694. // won't kill the whole process.
  4695. (void) signal(SIGPIPE, SIG_IGN);
  4696. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4697. (void) signal(SIGCHLD, SIG_IGN);
  4698. #endif // !_WIN32
  4699. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4700. (void) pthread_cond_init(&ctx->cond, NULL);
  4701. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4702. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4703. // Start master (listening) thread
  4704. mg_start_thread(master_thread, ctx);
  4705. // Start worker threads
  4706. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4707. if (mg_start_thread(worker_thread, ctx) != 0) {
  4708. cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
  4709. } else {
  4710. ctx->num_threads++;
  4711. }
  4712. }
  4713. return ctx;
  4714. }