mongoose.c 172 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. #if !defined(va_copy)
  134. #define va_copy(x, y) x = y
  135. #endif // !va_copy MINGW #defines va_copy
  136. #if !defined(fileno)
  137. #define fileno(x) _fileno(x)
  138. #endif // !fileno MINGW #defines fileno
  139. typedef HANDLE pthread_mutex_t;
  140. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  141. typedef DWORD pthread_t;
  142. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  143. static int pthread_mutex_lock(pthread_mutex_t *);
  144. static int pthread_mutex_unlock(pthread_mutex_t *);
  145. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
  146. struct file;
  147. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
  148. #if defined(HAVE_STDINT)
  149. #include <stdint.h>
  150. #else
  151. typedef unsigned int uint32_t;
  152. typedef unsigned short uint16_t;
  153. typedef unsigned __int64 uint64_t;
  154. typedef __int64 int64_t;
  155. #define INT64_MAX 9223372036854775807
  156. #endif // HAVE_STDINT
  157. // POSIX dirent interface
  158. struct dirent {
  159. char d_name[PATH_MAX];
  160. };
  161. typedef struct DIR {
  162. HANDLE handle;
  163. WIN32_FIND_DATAW info;
  164. struct dirent result;
  165. } DIR;
  166. #ifndef HAVE_POLL
  167. struct pollfd {
  168. SOCKET fd;
  169. short events;
  170. short revents;
  171. };
  172. #define POLLIN 1
  173. #endif
  174. // Mark required libraries
  175. #ifdef _MSC_VER
  176. #pragma comment(lib, "Ws2_32.lib")
  177. #endif
  178. #else // UNIX specific
  179. #include <sys/wait.h>
  180. #include <sys/socket.h>
  181. #include <sys/poll.h>
  182. #include <netinet/in.h>
  183. #include <arpa/inet.h>
  184. #include <sys/time.h>
  185. #include <stdint.h>
  186. #include <inttypes.h>
  187. #include <netdb.h>
  188. #include <pwd.h>
  189. #include <unistd.h>
  190. #include <dirent.h>
  191. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  192. #include <dlfcn.h>
  193. #endif
  194. #include <pthread.h>
  195. #if defined(__MACH__)
  196. #define SSL_LIB "libssl.dylib"
  197. #define CRYPTO_LIB "libcrypto.dylib"
  198. #else
  199. #if !defined(SSL_LIB)
  200. #define SSL_LIB "libssl.so"
  201. #endif
  202. #if !defined(CRYPTO_LIB)
  203. #define CRYPTO_LIB "libcrypto.so"
  204. #endif
  205. #endif
  206. #ifndef O_BINARY
  207. #define O_BINARY 0
  208. #endif // O_BINARY
  209. #define closesocket(a) close(a)
  210. #define mg_mkdir(x, y) mkdir(x, y)
  211. #define mg_remove(x) remove(x)
  212. #define mg_sleep(x) usleep((x) * 1000)
  213. #define ERRNO errno
  214. #define INVALID_SOCKET (-1)
  215. #define INT64_FMT PRId64
  216. typedef int SOCKET;
  217. #define WINCDECL
  218. #endif // End of Windows and UNIX specific includes
  219. #include "mongoose.h"
  220. #define MONGOOSE_VERSION "3.9"
  221. #define PASSWORDS_FILE_NAME ".htpasswd"
  222. #define CGI_ENVIRONMENT_SIZE 4096
  223. #define MAX_CGI_ENVIR_VARS 64
  224. #define MG_BUF_LEN 8192
  225. #define MAX_REQUEST_SIZE 16384
  226. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  227. #ifdef _WIN32
  228. static CRITICAL_SECTION global_log_file_lock;
  229. static pthread_t pthread_self(void) {
  230. return GetCurrentThreadId();
  231. }
  232. #endif // _WIN32
  233. #ifdef DEBUG_TRACE
  234. #undef DEBUG_TRACE
  235. #define DEBUG_TRACE(x)
  236. #else
  237. #if defined(DEBUG)
  238. #define DEBUG_TRACE(x) do { \
  239. flockfile(stdout); \
  240. printf("*** %lu.%p.%s.%d: ", \
  241. (unsigned long) time(NULL), (void *) pthread_self(), \
  242. __func__, __LINE__); \
  243. printf x; \
  244. putchar('\n'); \
  245. fflush(stdout); \
  246. funlockfile(stdout); \
  247. } while (0)
  248. #else
  249. #define DEBUG_TRACE(x)
  250. #endif // DEBUG
  251. #endif // DEBUG_TRACE
  252. // Darwin prior to 7.0 and Win32 do not have socklen_t
  253. #ifdef NO_SOCKLEN_T
  254. typedef int socklen_t;
  255. #endif // NO_SOCKLEN_T
  256. #define _DARWIN_UNLIMITED_SELECT
  257. #define IP_ADDR_STR_LEN 50 // IPv6 hex string is 46 chars
  258. #if !defined(MSG_NOSIGNAL)
  259. #define MSG_NOSIGNAL 0
  260. #endif
  261. #if !defined(SOMAXCONN)
  262. #define SOMAXCONN 100
  263. #endif
  264. #if !defined(PATH_MAX)
  265. #define PATH_MAX 4096
  266. #endif
  267. static const char *http_500_error = "Internal Server Error";
  268. #if defined(NO_SSL_DL)
  269. #include <openssl/ssl.h>
  270. #else
  271. // SSL loaded dynamically from DLL.
  272. // I put the prototypes here to be independent from OpenSSL source installation.
  273. typedef struct ssl_st SSL;
  274. typedef struct ssl_method_st SSL_METHOD;
  275. typedef struct ssl_ctx_st SSL_CTX;
  276. struct ssl_func {
  277. const char *name; // SSL function name
  278. void (*ptr)(void); // Function pointer
  279. };
  280. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  281. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  282. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  283. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  284. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  285. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  286. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  287. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  288. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  289. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  290. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  291. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  292. const char *, int)) ssl_sw[11].ptr)
  293. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  294. const char *, int)) ssl_sw[12].ptr)
  295. #define SSL_CTX_set_default_passwd_cb \
  296. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  297. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  298. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  299. #define SSL_CTX_use_certificate_chain_file \
  300. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  301. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  302. #define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
  303. #define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
  304. #define SSL_shutdown (* (int (*)(SSL *)) ssl_sw[20].ptr)
  305. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  306. #define CRYPTO_set_locking_callback \
  307. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  308. #define CRYPTO_set_id_callback \
  309. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  310. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  311. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  312. // set_ssl_option() function updates this array.
  313. // It loads SSL library dynamically and changes NULLs to the actual addresses
  314. // of respective functions. The macros above (like SSL_connect()) are really
  315. // just calling these functions indirectly via the pointer.
  316. static struct ssl_func ssl_sw[] = {
  317. {"SSL_free", NULL},
  318. {"SSL_accept", NULL},
  319. {"SSL_connect", NULL},
  320. {"SSL_read", NULL},
  321. {"SSL_write", NULL},
  322. {"SSL_get_error", NULL},
  323. {"SSL_set_fd", NULL},
  324. {"SSL_new", NULL},
  325. {"SSL_CTX_new", NULL},
  326. {"SSLv23_server_method", NULL},
  327. {"SSL_library_init", NULL},
  328. {"SSL_CTX_use_PrivateKey_file", NULL},
  329. {"SSL_CTX_use_certificate_file",NULL},
  330. {"SSL_CTX_set_default_passwd_cb",NULL},
  331. {"SSL_CTX_free", NULL},
  332. {"SSL_load_error_strings", NULL},
  333. {"SSL_CTX_use_certificate_chain_file", NULL},
  334. {"SSLv23_client_method", NULL},
  335. {"SSL_pending", NULL},
  336. {"SSL_CTX_set_verify", NULL},
  337. {"SSL_shutdown", NULL},
  338. {NULL, NULL}
  339. };
  340. // Similar array as ssl_sw. These functions could be located in different lib.
  341. #if !defined(NO_SSL)
  342. static struct ssl_func crypto_sw[] = {
  343. {"CRYPTO_num_locks", NULL},
  344. {"CRYPTO_set_locking_callback", NULL},
  345. {"CRYPTO_set_id_callback", NULL},
  346. {"ERR_get_error", NULL},
  347. {"ERR_error_string", NULL},
  348. {NULL, NULL}
  349. };
  350. #endif // NO_SSL
  351. #endif // NO_SSL_DL
  352. static const char *month_names[] = {
  353. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  354. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  355. };
  356. // Unified socket address. For IPv6 support, add IPv6 address structure
  357. // in the union u.
  358. union usa {
  359. struct sockaddr sa;
  360. struct sockaddr_in sin;
  361. #if defined(USE_IPV6)
  362. struct sockaddr_in6 sin6;
  363. #endif
  364. };
  365. // Describes a string (chunk of memory).
  366. struct vec {
  367. const char *ptr;
  368. size_t len;
  369. };
  370. struct file {
  371. int is_directory;
  372. time_t modification_time;
  373. int64_t size;
  374. FILE *fp;
  375. const char *membuf; // Non-NULL if file data is in memory
  376. // set to 1 if the content is gzipped
  377. // in which case we need a content-encoding: gzip header
  378. int gzipped;
  379. };
  380. #define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL, 0}
  381. // Describes listening socket, or socket which was accept()-ed by the master
  382. // thread and queued for future handling by the worker thread.
  383. struct socket {
  384. SOCKET sock; // Listening socket
  385. union usa lsa; // Local socket address
  386. union usa rsa; // Remote socket address
  387. unsigned is_ssl:1; // Is port SSL-ed
  388. unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
  389. };
  390. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  391. enum {
  392. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  393. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  394. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  395. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  396. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  397. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
  398. NUM_OPTIONS
  399. };
  400. static const char *config_options[] = {
  401. "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  402. "cgi_environment", NULL,
  403. "put_delete_auth_file", NULL,
  404. "cgi_interpreter", NULL,
  405. "protect_uri", NULL,
  406. "authentication_domain", "mydomain.com",
  407. "ssi_pattern", "**.shtml$|**.shtm$",
  408. "throttle", NULL,
  409. "access_log_file", NULL,
  410. "enable_directory_listing", "yes",
  411. "error_log_file", NULL,
  412. "global_auth_file", NULL,
  413. "index_files",
  414. "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
  415. "enable_keep_alive", "no",
  416. "access_control_list", NULL,
  417. "extra_mime_types", NULL,
  418. "listening_ports", "8080",
  419. "document_root", NULL,
  420. "ssl_certificate", NULL,
  421. "num_threads", "50",
  422. "run_as_user", NULL,
  423. "url_rewrite_patterns", NULL,
  424. "hide_files_patterns", NULL,
  425. "request_timeout_ms", "30000",
  426. NULL
  427. };
  428. struct mg_context {
  429. volatile int stop_flag; // Should we stop event loop
  430. SSL_CTX *ssl_ctx; // SSL context
  431. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  432. struct mg_callbacks callbacks; // User-defined callback function
  433. void *user_data; // User-defined data
  434. struct socket *listening_sockets;
  435. int num_listening_sockets;
  436. volatile int num_threads; // Number of threads
  437. pthread_mutex_t mutex; // Protects (max|num)_threads
  438. pthread_cond_t cond; // Condvar for tracking workers terminations
  439. struct socket queue[20]; // Accepted sockets
  440. volatile int sq_head; // Head of the socket queue
  441. volatile int sq_tail; // Tail of the socket queue
  442. pthread_cond_t sq_full; // Signaled when socket is produced
  443. pthread_cond_t sq_empty; // Signaled when socket is consumed
  444. };
  445. struct mg_connection {
  446. struct mg_request_info request_info;
  447. struct mg_context *ctx;
  448. SSL *ssl; // SSL descriptor
  449. SSL_CTX *client_ssl_ctx; // SSL context for client connections
  450. struct socket client; // Connected client
  451. time_t birth_time; // Time when request was received
  452. int64_t num_bytes_sent; // Total bytes sent to client
  453. int64_t content_len; // Content-Length header value
  454. int64_t consumed_content; // How many bytes of content have been read
  455. char *buf; // Buffer for received data
  456. char *path_info; // PATH_INFO part of the URL
  457. int must_close; // 1 if connection must be closed
  458. int buf_size; // Buffer size
  459. int request_len; // Size of the request + headers in a buffer
  460. int data_len; // Total size of data in a buffer
  461. int status_code; // HTTP reply status code, e.g. 200
  462. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  463. time_t last_throttle_time; // Last time throttled data was sent
  464. int64_t last_throttle_bytes;// Bytes sent this second
  465. };
  466. // Directory entry
  467. struct de {
  468. struct mg_connection *conn;
  469. char *file_name;
  470. struct file file;
  471. };
  472. const char **mg_get_valid_option_names(void) {
  473. return config_options;
  474. }
  475. static int is_file_in_memory(struct mg_connection *conn, const char *path,
  476. struct file *filep) {
  477. size_t size = 0;
  478. if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
  479. conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
  480. // NOTE: override filep->size only on success. Otherwise, it might break
  481. // constructs like if (!mg_stat() || !mg_fopen()) ...
  482. filep->size = size;
  483. }
  484. return filep->membuf != NULL;
  485. }
  486. static int is_file_opened(const struct file *filep) {
  487. return filep->membuf != NULL || filep->fp != NULL;
  488. }
  489. static int mg_fopen(struct mg_connection *conn, const char *path,
  490. const char *mode, struct file *filep) {
  491. if (!is_file_in_memory(conn, path, filep)) {
  492. #ifdef _WIN32
  493. wchar_t wbuf[PATH_MAX], wmode[20];
  494. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  495. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  496. filep->fp = _wfopen(wbuf, wmode);
  497. #else
  498. filep->fp = fopen(path, mode);
  499. #endif
  500. }
  501. return is_file_opened(filep);
  502. }
  503. static void mg_fclose(struct file *filep) {
  504. if (filep != NULL && filep->fp != NULL) {
  505. fclose(filep->fp);
  506. }
  507. }
  508. static int get_option_index(const char *name) {
  509. int i;
  510. for (i = 0; config_options[i * 2] != NULL; i++) {
  511. if (strcmp(config_options[i * 2], name) == 0) {
  512. return i;
  513. }
  514. }
  515. return -1;
  516. }
  517. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  518. int i;
  519. if ((i = get_option_index(name)) == -1) {
  520. return NULL;
  521. } else if (ctx->config[i] == NULL) {
  522. return "";
  523. } else {
  524. return ctx->config[i];
  525. }
  526. }
  527. static void sockaddr_to_string(char *buf, size_t len,
  528. const union usa *usa) {
  529. buf[0] = '\0';
  530. #if defined(USE_IPV6)
  531. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  532. (void *) &usa->sin.sin_addr :
  533. (void *) &usa->sin6.sin6_addr, buf, len);
  534. #elif defined(_WIN32)
  535. // Only Windoze Vista (and newer) have inet_ntop()
  536. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  537. #else
  538. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  539. #endif
  540. }
  541. static void cry(struct mg_connection *conn,
  542. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  543. // Print error message to the opened error log stream.
  544. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  545. char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN];
  546. va_list ap;
  547. FILE *fp;
  548. time_t timestamp;
  549. va_start(ap, fmt);
  550. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  551. va_end(ap);
  552. // Do not lock when getting the callback value, here and below.
  553. // I suppose this is fine, since function cannot disappear in the
  554. // same way string option can.
  555. if (conn->ctx->callbacks.log_message == NULL ||
  556. conn->ctx->callbacks.log_message(conn, buf) == 0) {
  557. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  558. fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  559. if (fp != NULL) {
  560. flockfile(fp);
  561. timestamp = time(NULL);
  562. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  563. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  564. src_addr);
  565. if (conn->request_info.request_method != NULL) {
  566. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  567. conn->request_info.uri);
  568. }
  569. fprintf(fp, "%s", buf);
  570. fputc('\n', fp);
  571. funlockfile(fp);
  572. fclose(fp);
  573. }
  574. }
  575. }
  576. // Return fake connection structure. Used for logging, if connection
  577. // is not applicable at the moment of logging.
  578. static struct mg_connection *fc(struct mg_context *ctx) {
  579. static struct mg_connection fake_connection;
  580. fake_connection.ctx = ctx;
  581. return &fake_connection;
  582. }
  583. const char *mg_version(void) {
  584. return MONGOOSE_VERSION;
  585. }
  586. struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
  587. return &conn->request_info;
  588. }
  589. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  590. for (; *src != '\0' && n > 1; n--) {
  591. *dst++ = *src++;
  592. }
  593. *dst = '\0';
  594. }
  595. static int lowercase(const char *s) {
  596. return tolower(* (const unsigned char *) s);
  597. }
  598. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  599. int diff = 0;
  600. if (len > 0)
  601. do {
  602. diff = lowercase(s1++) - lowercase(s2++);
  603. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  604. return diff;
  605. }
  606. static int mg_strcasecmp(const char *s1, const char *s2) {
  607. int diff;
  608. do {
  609. diff = lowercase(s1++) - lowercase(s2++);
  610. } while (diff == 0 && s1[-1] != '\0');
  611. return diff;
  612. }
  613. static char * mg_strndup(const char *ptr, size_t len) {
  614. char *p;
  615. if ((p = (char *) malloc(len + 1)) != NULL) {
  616. mg_strlcpy(p, ptr, len + 1);
  617. }
  618. return p;
  619. }
  620. static char * mg_strdup(const char *str) {
  621. return mg_strndup(str, strlen(str));
  622. }
  623. static const char *mg_strcasestr(const char *big_str, const char *small_str) {
  624. int i, big_len = strlen(big_str), small_len = strlen(small_str);
  625. for (i = 0; i <= big_len - small_len; i++) {
  626. if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
  627. return big_str + i;
  628. }
  629. }
  630. return NULL;
  631. }
  632. // Like snprintf(), but never returns negative value, or a value
  633. // that is larger than a supplied buffer.
  634. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  635. // in his audit report.
  636. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  637. const char *fmt, va_list ap) {
  638. int n;
  639. if (buflen == 0)
  640. return 0;
  641. n = vsnprintf(buf, buflen, fmt, ap);
  642. if (n < 0) {
  643. cry(conn, "vsnprintf error");
  644. n = 0;
  645. } else if (n >= (int) buflen) {
  646. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  647. n > 200 ? 200 : n, buf);
  648. n = (int) buflen - 1;
  649. }
  650. buf[n] = '\0';
  651. return n;
  652. }
  653. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  654. PRINTF_FORMAT_STRING(const char *fmt), ...)
  655. PRINTF_ARGS(4, 5);
  656. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  657. const char *fmt, ...) {
  658. va_list ap;
  659. int n;
  660. va_start(ap, fmt);
  661. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  662. va_end(ap);
  663. return n;
  664. }
  665. // Skip the characters until one of the delimiters characters found.
  666. // 0-terminate resulting word. Skip the delimiter and following whitespaces.
  667. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  668. // Delimiters can be quoted with quotechar.
  669. static char *skip_quoted(char **buf, const char *delimiters,
  670. const char *whitespace, char quotechar) {
  671. char *p, *begin_word, *end_word, *end_whitespace;
  672. begin_word = *buf;
  673. end_word = begin_word + strcspn(begin_word, delimiters);
  674. // Check for quotechar
  675. if (end_word > begin_word) {
  676. p = end_word - 1;
  677. while (*p == quotechar) {
  678. // If there is anything beyond end_word, copy it
  679. if (*end_word == '\0') {
  680. *p = '\0';
  681. break;
  682. } else {
  683. size_t end_off = strcspn(end_word + 1, delimiters);
  684. memmove (p, end_word, end_off + 1);
  685. p += end_off; // p must correspond to end_word - 1
  686. end_word += end_off + 1;
  687. }
  688. }
  689. for (p++; p < end_word; p++) {
  690. *p = '\0';
  691. }
  692. }
  693. if (*end_word == '\0') {
  694. *buf = end_word;
  695. } else {
  696. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  697. for (p = end_word; p < end_whitespace; p++) {
  698. *p = '\0';
  699. }
  700. *buf = end_whitespace;
  701. }
  702. return begin_word;
  703. }
  704. // Simplified version of skip_quoted without quote char
  705. // and whitespace == delimiters
  706. static char *skip(char **buf, const char *delimiters) {
  707. return skip_quoted(buf, delimiters, delimiters, 0);
  708. }
  709. // Return HTTP header value, or NULL if not found.
  710. static const char *get_header(const struct mg_request_info *ri,
  711. const char *name) {
  712. int i;
  713. for (i = 0; i < ri->num_headers; i++)
  714. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  715. return ri->http_headers[i].value;
  716. return NULL;
  717. }
  718. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  719. return get_header(&conn->request_info, name);
  720. }
  721. // A helper function for traversing a comma separated list of values.
  722. // It returns a list pointer shifted to the next value, or NULL if the end
  723. // of the list found.
  724. // Value is stored in val vector. If value has form "x=y", then eq_val
  725. // vector is initialized to point to the "y" part, and val vector length
  726. // is adjusted to point only to "x".
  727. static const char *next_option(const char *list, struct vec *val,
  728. struct vec *eq_val) {
  729. if (list == NULL || *list == '\0') {
  730. // End of the list
  731. list = NULL;
  732. } else {
  733. val->ptr = list;
  734. if ((list = strchr(val->ptr, ',')) != NULL) {
  735. // Comma found. Store length and shift the list ptr
  736. val->len = list - val->ptr;
  737. list++;
  738. } else {
  739. // This value is the last one
  740. list = val->ptr + strlen(val->ptr);
  741. val->len = list - val->ptr;
  742. }
  743. if (eq_val != NULL) {
  744. // Value has form "x=y", adjust pointers and lengths
  745. // so that val points to "x", and eq_val points to "y".
  746. eq_val->len = 0;
  747. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  748. if (eq_val->ptr != NULL) {
  749. eq_val->ptr++; // Skip over '=' character
  750. eq_val->len = val->ptr + val->len - eq_val->ptr;
  751. val->len = (eq_val->ptr - val->ptr) - 1;
  752. }
  753. }
  754. }
  755. return list;
  756. }
  757. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  758. const char *or_str;
  759. int i, j, len, res;
  760. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  761. res = match_prefix(pattern, or_str - pattern, str);
  762. return res > 0 ? res :
  763. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  764. }
  765. i = j = 0;
  766. res = -1;
  767. for (; i < pattern_len; i++, j++) {
  768. if (pattern[i] == '?' && str[j] != '\0') {
  769. continue;
  770. } else if (pattern[i] == '$') {
  771. return str[j] == '\0' ? j : -1;
  772. } else if (pattern[i] == '*') {
  773. i++;
  774. if (pattern[i] == '*') {
  775. i++;
  776. len = (int) strlen(str + j);
  777. } else {
  778. len = (int) strcspn(str + j, "/");
  779. }
  780. if (i == pattern_len) {
  781. return j + len;
  782. }
  783. do {
  784. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  785. } while (res == -1 && len-- > 0);
  786. return res == -1 ? -1 : j + res + len;
  787. } else if (pattern[i] != str[j]) {
  788. return -1;
  789. }
  790. }
  791. return j;
  792. }
  793. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  794. // This function must tolerate situations when connection info is not
  795. // set up, for example if request parsing failed.
  796. static int should_keep_alive(const struct mg_connection *conn) {
  797. const char *http_version = conn->request_info.http_version;
  798. const char *header = mg_get_header(conn, "Connection");
  799. if (conn->must_close ||
  800. conn->status_code == 401 ||
  801. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  802. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  803. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  804. return 0;
  805. }
  806. return 1;
  807. }
  808. static const char *suggest_connection_header(const struct mg_connection *conn) {
  809. return should_keep_alive(conn) ? "keep-alive" : "close";
  810. }
  811. static void send_http_error(struct mg_connection *, int, const char *,
  812. PRINTF_FORMAT_STRING(const char *fmt), ...)
  813. PRINTF_ARGS(4, 5);
  814. static void send_http_error(struct mg_connection *conn, int status,
  815. const char *reason, const char *fmt, ...) {
  816. char buf[MG_BUF_LEN];
  817. va_list ap;
  818. int len = 0;
  819. conn->status_code = status;
  820. if (conn->ctx->callbacks.http_error == NULL ||
  821. conn->ctx->callbacks.http_error(conn, status)) {
  822. buf[0] = '\0';
  823. // Errors 1xx, 204 and 304 MUST NOT send a body
  824. if (status > 199 && status != 204 && status != 304) {
  825. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  826. buf[len++] = '\n';
  827. va_start(ap, fmt);
  828. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  829. va_end(ap);
  830. }
  831. DEBUG_TRACE(("[%s]", buf));
  832. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  833. "Content-Length: %d\r\n"
  834. "Connection: %s\r\n\r\n", status, reason, len,
  835. suggest_connection_header(conn));
  836. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  837. }
  838. }
  839. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  840. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  841. (void) unused;
  842. *mutex = CreateMutex(NULL, FALSE, NULL);
  843. return *mutex == NULL ? -1 : 0;
  844. }
  845. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  846. return CloseHandle(*mutex) == 0 ? -1 : 0;
  847. }
  848. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  849. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  850. }
  851. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  852. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  853. }
  854. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  855. (void) unused;
  856. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  857. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  858. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  859. }
  860. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  861. HANDLE handles[] = {cv->signal, cv->broadcast};
  862. ReleaseMutex(*mutex);
  863. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  864. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  865. }
  866. static int pthread_cond_signal(pthread_cond_t *cv) {
  867. return SetEvent(cv->signal) == 0 ? -1 : 0;
  868. }
  869. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  870. // Implementation with PulseEvent() has race condition, see
  871. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  872. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  873. }
  874. static int pthread_cond_destroy(pthread_cond_t *cv) {
  875. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  876. }
  877. // For Windows, change all slashes to backslashes in path names.
  878. static void change_slashes_to_backslashes(char *path) {
  879. int i;
  880. for (i = 0; path[i] != '\0'; i++) {
  881. if (path[i] == '/')
  882. path[i] = '\\';
  883. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  884. if (path[i] == '\\' && i > 0)
  885. while (path[i + 1] == '\\' || path[i + 1] == '/')
  886. (void) memmove(path + i + 1,
  887. path + i + 2, strlen(path + i + 1));
  888. }
  889. }
  890. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  891. // wbuf and wbuf_len is a target buffer and its length.
  892. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  893. char buf[PATH_MAX], buf2[PATH_MAX];
  894. mg_strlcpy(buf, path, sizeof(buf));
  895. change_slashes_to_backslashes(buf);
  896. // Convert to Unicode and back. If doubly-converted string does not
  897. // match the original, something is fishy, reject.
  898. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  899. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  900. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  901. NULL, NULL);
  902. if (strcmp(buf, buf2) != 0) {
  903. wbuf[0] = L'\0';
  904. }
  905. }
  906. #if defined(_WIN32_WCE)
  907. static time_t time(time_t *ptime) {
  908. time_t t;
  909. SYSTEMTIME st;
  910. FILETIME ft;
  911. GetSystemTime(&st);
  912. SystemTimeToFileTime(&st, &ft);
  913. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  914. if (ptime != NULL) {
  915. *ptime = t;
  916. }
  917. return t;
  918. }
  919. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  920. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  921. FILETIME ft, lft;
  922. SYSTEMTIME st;
  923. TIME_ZONE_INFORMATION tzinfo;
  924. if (ptm == NULL) {
  925. return NULL;
  926. }
  927. * (int64_t *) &ft = t;
  928. FileTimeToLocalFileTime(&ft, &lft);
  929. FileTimeToSystemTime(&lft, &st);
  930. ptm->tm_year = st.wYear - 1900;
  931. ptm->tm_mon = st.wMonth - 1;
  932. ptm->tm_wday = st.wDayOfWeek;
  933. ptm->tm_mday = st.wDay;
  934. ptm->tm_hour = st.wHour;
  935. ptm->tm_min = st.wMinute;
  936. ptm->tm_sec = st.wSecond;
  937. ptm->tm_yday = 0; // hope nobody uses this
  938. ptm->tm_isdst =
  939. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  940. return ptm;
  941. }
  942. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  943. // FIXME(lsm): fix this.
  944. return localtime(ptime, ptm);
  945. }
  946. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  947. const struct tm *tm) {
  948. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  949. return 0;
  950. }
  951. #endif
  952. // Windows happily opens files with some garbage at the end of file name.
  953. // For example, fopen("a.cgi ", "r") on Windows successfully opens
  954. // "a.cgi", despite one would expect an error back.
  955. // This function returns non-0 if path ends with some garbage.
  956. static int path_cannot_disclose_cgi(const char *path) {
  957. static const char *allowed_last_characters = "_-";
  958. int last = path[strlen(path) - 1];
  959. return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
  960. }
  961. static int mg_stat(struct mg_connection *conn, const char *path,
  962. struct file *filep) {
  963. wchar_t wbuf[PATH_MAX];
  964. WIN32_FILE_ATTRIBUTE_DATA info;
  965. if (!is_file_in_memory(conn, path, filep)) {
  966. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  967. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  968. filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  969. filep->modification_time = SYS2UNIX_TIME(
  970. info.ftLastWriteTime.dwLowDateTime,
  971. info.ftLastWriteTime.dwHighDateTime);
  972. filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  973. // If file name is fishy, reset the file structure and return error.
  974. // Note it is important to reset, not just return the error, cause
  975. // functions like is_file_opened() check the struct.
  976. if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
  977. memset(filep, 0, sizeof(*filep));
  978. }
  979. }
  980. }
  981. return filep->membuf != NULL || filep->modification_time != 0;
  982. }
  983. static int mg_remove(const char *path) {
  984. wchar_t wbuf[PATH_MAX];
  985. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  986. return DeleteFileW(wbuf) ? 0 : -1;
  987. }
  988. static int mg_mkdir(const char *path, int mode) {
  989. char buf[PATH_MAX];
  990. wchar_t wbuf[PATH_MAX];
  991. (void) mode;
  992. mg_strlcpy(buf, path, sizeof(buf));
  993. change_slashes_to_backslashes(buf);
  994. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
  995. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  996. }
  997. // Implementation of POSIX opendir/closedir/readdir for Windows.
  998. static DIR * opendir(const char *name) {
  999. DIR *dir = NULL;
  1000. wchar_t wpath[PATH_MAX];
  1001. DWORD attrs;
  1002. if (name == NULL) {
  1003. SetLastError(ERROR_BAD_ARGUMENTS);
  1004. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  1005. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  1006. } else {
  1007. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  1008. attrs = GetFileAttributesW(wpath);
  1009. if (attrs != 0xFFFFFFFF &&
  1010. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  1011. (void) wcscat(wpath, L"\\*");
  1012. dir->handle = FindFirstFileW(wpath, &dir->info);
  1013. dir->result.d_name[0] = '\0';
  1014. } else {
  1015. free(dir);
  1016. dir = NULL;
  1017. }
  1018. }
  1019. return dir;
  1020. }
  1021. static int closedir(DIR *dir) {
  1022. int result = 0;
  1023. if (dir != NULL) {
  1024. if (dir->handle != INVALID_HANDLE_VALUE)
  1025. result = FindClose(dir->handle) ? 0 : -1;
  1026. free(dir);
  1027. } else {
  1028. result = -1;
  1029. SetLastError(ERROR_BAD_ARGUMENTS);
  1030. }
  1031. return result;
  1032. }
  1033. static struct dirent *readdir(DIR *dir) {
  1034. struct dirent *result = 0;
  1035. if (dir) {
  1036. if (dir->handle != INVALID_HANDLE_VALUE) {
  1037. result = &dir->result;
  1038. (void) WideCharToMultiByte(CP_UTF8, 0,
  1039. dir->info.cFileName, -1, result->d_name,
  1040. sizeof(result->d_name), NULL, NULL);
  1041. if (!FindNextFileW(dir->handle, &dir->info)) {
  1042. (void) FindClose(dir->handle);
  1043. dir->handle = INVALID_HANDLE_VALUE;
  1044. }
  1045. } else {
  1046. SetLastError(ERROR_FILE_NOT_FOUND);
  1047. }
  1048. } else {
  1049. SetLastError(ERROR_BAD_ARGUMENTS);
  1050. }
  1051. return result;
  1052. }
  1053. #ifndef HAVE_POLL
  1054. static int poll(struct pollfd *pfd, int n, int milliseconds) {
  1055. struct timeval tv;
  1056. fd_set set;
  1057. int i, result;
  1058. SOCKET maxfd = 0;
  1059. tv.tv_sec = milliseconds / 1000;
  1060. tv.tv_usec = (milliseconds % 1000) * 1000;
  1061. FD_ZERO(&set);
  1062. for (i = 0; i < n; i++) {
  1063. FD_SET((SOCKET) pfd[i].fd, &set);
  1064. pfd[i].revents = 0;
  1065. if (pfd[i].fd > maxfd) {
  1066. maxfd = pfd[i].fd;
  1067. }
  1068. }
  1069. if ((result = select(maxfd + 1, &set, NULL, NULL, &tv)) > 0) {
  1070. for (i = 0; i < n; i++) {
  1071. if (FD_ISSET(pfd[i].fd, &set)) {
  1072. pfd[i].revents = POLLIN;
  1073. }
  1074. }
  1075. }
  1076. return result;
  1077. }
  1078. #endif // HAVE_POLL
  1079. static void set_close_on_exec(SOCKET sock) {
  1080. (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
  1081. }
  1082. int mg_start_thread(mg_thread_func_t f, void *p) {
  1083. return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1084. }
  1085. static HANDLE dlopen(const char *dll_name, int flags) {
  1086. wchar_t wbuf[PATH_MAX];
  1087. (void) flags;
  1088. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1089. return LoadLibraryW(wbuf);
  1090. }
  1091. #if !defined(NO_CGI)
  1092. #define SIGKILL 0
  1093. static int kill(pid_t pid, int sig_num) {
  1094. (void) TerminateProcess(pid, sig_num);
  1095. (void) CloseHandle(pid);
  1096. return 0;
  1097. }
  1098. static void trim_trailing_whitespaces(char *s) {
  1099. char *e = s + strlen(s) - 1;
  1100. while (e > s && isspace(* (unsigned char *) e)) {
  1101. *e-- = '\0';
  1102. }
  1103. }
  1104. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1105. char *envblk, char *envp[], int fd_stdin,
  1106. int fd_stdout, const char *dir) {
  1107. HANDLE me;
  1108. char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
  1109. cmdline[PATH_MAX], buf[PATH_MAX];
  1110. struct file file = STRUCT_FILE_INITIALIZER;
  1111. STARTUPINFOA si;
  1112. PROCESS_INFORMATION pi = { 0 };
  1113. (void) envp;
  1114. memset(&si, 0, sizeof(si));
  1115. si.cb = sizeof(si);
  1116. // TODO(lsm): redirect CGI errors to the error log file
  1117. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1118. si.wShowWindow = SW_HIDE;
  1119. me = GetCurrentProcess();
  1120. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  1121. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1122. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  1123. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1124. // If CGI file is a script, try to read the interpreter line
  1125. interp = conn->ctx->config[CGI_INTERPRETER];
  1126. if (interp == NULL) {
  1127. buf[0] = buf[1] = '\0';
  1128. // Read the first line of the script into the buffer
  1129. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1130. if (mg_fopen(conn, cmdline, "r", &file)) {
  1131. p = (char *) file.membuf;
  1132. mg_fgets(buf, sizeof(buf), &file, &p);
  1133. mg_fclose(&file);
  1134. buf[sizeof(buf) - 1] = '\0';
  1135. }
  1136. if (buf[0] == '#' && buf[1] == '!') {
  1137. trim_trailing_whitespaces(buf + 2);
  1138. } else {
  1139. buf[2] = '\0';
  1140. }
  1141. interp = buf + 2;
  1142. }
  1143. if (interp[0] != '\0') {
  1144. GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
  1145. interp = full_interp;
  1146. }
  1147. GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
  1148. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s\"%s\\%s\"",
  1149. interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
  1150. DEBUG_TRACE(("Running [%s]", cmdline));
  1151. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1152. CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
  1153. cry(conn, "%s: CreateProcess(%s): %ld",
  1154. __func__, cmdline, ERRNO);
  1155. pi.hProcess = (pid_t) -1;
  1156. }
  1157. // Always close these to prevent handle leakage.
  1158. (void) close(fd_stdin);
  1159. (void) close(fd_stdout);
  1160. (void) CloseHandle(si.hStdOutput);
  1161. (void) CloseHandle(si.hStdInput);
  1162. (void) CloseHandle(pi.hThread);
  1163. return (pid_t) pi.hProcess;
  1164. }
  1165. #endif // !NO_CGI
  1166. static int set_non_blocking_mode(SOCKET sock) {
  1167. unsigned long on = 1;
  1168. return ioctlsocket(sock, FIONBIO, &on);
  1169. }
  1170. #else
  1171. static int mg_stat(struct mg_connection *conn, const char *path,
  1172. struct file *filep) {
  1173. struct stat st;
  1174. if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
  1175. filep->size = st.st_size;
  1176. filep->modification_time = st.st_mtime;
  1177. filep->is_directory = S_ISDIR(st.st_mode);
  1178. } else {
  1179. filep->modification_time = (time_t) 0;
  1180. }
  1181. return filep->membuf != NULL || filep->modification_time != (time_t) 0;
  1182. }
  1183. static void set_close_on_exec(int fd) {
  1184. fcntl(fd, F_SETFD, FD_CLOEXEC);
  1185. }
  1186. int mg_start_thread(mg_thread_func_t func, void *param) {
  1187. pthread_t thread_id;
  1188. pthread_attr_t attr;
  1189. int result;
  1190. (void) pthread_attr_init(&attr);
  1191. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1192. #if USE_STACK_SIZE > 1
  1193. // Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384
  1194. (void) pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
  1195. #endif
  1196. result = pthread_create(&thread_id, &attr, func, param);
  1197. pthread_attr_destroy(&attr);
  1198. return result;
  1199. }
  1200. #ifndef NO_CGI
  1201. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1202. char *envblk, char *envp[], int fd_stdin,
  1203. int fd_stdout, const char *dir) {
  1204. pid_t pid;
  1205. const char *interp;
  1206. (void) envblk;
  1207. if ((pid = fork()) == -1) {
  1208. // Parent
  1209. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1210. } else if (pid == 0) {
  1211. // Child
  1212. if (chdir(dir) != 0) {
  1213. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1214. } else if (dup2(fd_stdin, 0) == -1) {
  1215. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1216. } else if (dup2(fd_stdout, 1) == -1) {
  1217. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1218. } else {
  1219. // Not redirecting stderr to stdout, to avoid output being littered
  1220. // with the error messages.
  1221. (void) close(fd_stdin);
  1222. (void) close(fd_stdout);
  1223. // After exec, all signal handlers are restored to their default values,
  1224. // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
  1225. // implementation, SIGCHLD's handler will leave unchanged after exec
  1226. // if it was set to be ignored. Restore it to default action.
  1227. signal(SIGCHLD, SIG_DFL);
  1228. interp = conn->ctx->config[CGI_INTERPRETER];
  1229. if (interp == NULL) {
  1230. (void) execle(prog, prog, NULL, envp);
  1231. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1232. } else {
  1233. (void) execle(interp, interp, prog, NULL, envp);
  1234. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1235. strerror(ERRNO));
  1236. }
  1237. }
  1238. exit(EXIT_FAILURE);
  1239. }
  1240. // Parent. Close stdio descriptors
  1241. (void) close(fd_stdin);
  1242. (void) close(fd_stdout);
  1243. return pid;
  1244. }
  1245. #endif // !NO_CGI
  1246. static int set_non_blocking_mode(SOCKET sock) {
  1247. int flags;
  1248. flags = fcntl(sock, F_GETFL, 0);
  1249. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1250. return 0;
  1251. }
  1252. #endif // _WIN32
  1253. // Write data to the IO channel - opened file descriptor, socket or SSL
  1254. // descriptor. Return number of bytes written.
  1255. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1256. int64_t len) {
  1257. int64_t sent;
  1258. int n, k;
  1259. (void) ssl; // Get rid of warning
  1260. sent = 0;
  1261. while (sent < len) {
  1262. // How many bytes we send in this iteration
  1263. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1264. #ifndef NO_SSL
  1265. if (ssl != NULL) {
  1266. n = SSL_write(ssl, buf + sent, k);
  1267. } else
  1268. #endif
  1269. if (fp != NULL) {
  1270. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1271. if (ferror(fp))
  1272. n = -1;
  1273. } else {
  1274. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1275. }
  1276. if (n <= 0)
  1277. break;
  1278. sent += n;
  1279. }
  1280. return sent;
  1281. }
  1282. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1283. // Return negative value on error, or number of bytes read on success.
  1284. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1285. int nread;
  1286. if (fp != NULL) {
  1287. // Use read() instead of fread(), because if we're reading from the CGI
  1288. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1289. // to block and must pass all read bytes immediately to the client.
  1290. nread = read(fileno(fp), buf, (size_t) len);
  1291. #ifndef NO_SSL
  1292. } else if (conn->ssl != NULL) {
  1293. nread = SSL_read(conn->ssl, buf, len);
  1294. #endif
  1295. } else {
  1296. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1297. }
  1298. return conn->ctx->stop_flag ? -1 : nread;
  1299. }
  1300. static int pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1301. int n, nread = 0;
  1302. while (len > 0 && conn->ctx->stop_flag == 0) {
  1303. n = pull(fp, conn, buf + nread, len);
  1304. if (n < 0) {
  1305. nread = n; // Propagate the error
  1306. break;
  1307. } else if (n == 0) {
  1308. break; // No more data to read
  1309. } else {
  1310. conn->consumed_content += n;
  1311. nread += n;
  1312. len -= n;
  1313. }
  1314. }
  1315. return nread;
  1316. }
  1317. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1318. int n, buffered_len, nread;
  1319. const char *body;
  1320. // If Content-Length is not set, read until socket is closed
  1321. if (conn->consumed_content == 0 && conn->content_len == 0) {
  1322. conn->content_len = INT64_MAX;
  1323. conn->must_close = 1;
  1324. }
  1325. nread = 0;
  1326. if (conn->consumed_content < conn->content_len) {
  1327. // Adjust number of bytes to read.
  1328. int64_t to_read = conn->content_len - conn->consumed_content;
  1329. if (to_read < (int64_t) len) {
  1330. len = (size_t) to_read;
  1331. }
  1332. // Return buffered data
  1333. body = conn->buf + conn->request_len + conn->consumed_content;
  1334. buffered_len = &conn->buf[conn->data_len] - body;
  1335. if (buffered_len > 0) {
  1336. if (len < (size_t) buffered_len) {
  1337. buffered_len = (int) len;
  1338. }
  1339. memcpy(buf, body, (size_t) buffered_len);
  1340. len -= buffered_len;
  1341. conn->consumed_content += buffered_len;
  1342. nread += buffered_len;
  1343. buf = (char *) buf + buffered_len;
  1344. }
  1345. // We have returned all buffered data. Read new data from the remote socket.
  1346. n = pull_all(NULL, conn, (char *) buf, (int) len);
  1347. nread = n >= 0 ? nread + n : n;
  1348. }
  1349. return nread;
  1350. }
  1351. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1352. time_t now;
  1353. int64_t n, total, allowed;
  1354. if (conn->throttle > 0) {
  1355. if ((now = time(NULL)) != conn->last_throttle_time) {
  1356. conn->last_throttle_time = now;
  1357. conn->last_throttle_bytes = 0;
  1358. }
  1359. allowed = conn->throttle - conn->last_throttle_bytes;
  1360. if (allowed > (int64_t) len) {
  1361. allowed = len;
  1362. }
  1363. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1364. (int64_t) allowed)) == allowed) {
  1365. buf = (char *) buf + total;
  1366. conn->last_throttle_bytes += total;
  1367. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1368. allowed = conn->throttle > (int64_t) len - total ?
  1369. (int64_t) len - total : conn->throttle;
  1370. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1371. (int64_t) allowed)) != allowed) {
  1372. break;
  1373. }
  1374. sleep(1);
  1375. conn->last_throttle_bytes = allowed;
  1376. conn->last_throttle_time = time(NULL);
  1377. buf = (char *) buf + n;
  1378. total += n;
  1379. }
  1380. }
  1381. } else {
  1382. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1383. (int64_t) len);
  1384. }
  1385. return (int) total;
  1386. }
  1387. // Print message to buffer. If buffer is large enough to hold the message,
  1388. // return buffer. If buffer is to small, allocate large enough buffer on heap,
  1389. // and return allocated buffer.
  1390. static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
  1391. va_list ap_copy;
  1392. int len;
  1393. // Windows is not standard-compliant, and vsnprintf() returns -1 if
  1394. // buffer is too small. Also, older versions of msvcrt.dll do not have
  1395. // _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
  1396. // Therefore, we make two passes: on first pass, get required message length.
  1397. // On second pass, actually print the message.
  1398. va_copy(ap_copy, ap);
  1399. len = vsnprintf(NULL, 0, fmt, ap_copy);
  1400. if (len > (int) size &&
  1401. (size = len + 1) > 0 &&
  1402. (*buf = (char *) malloc(size)) == NULL) {
  1403. len = -1; // Allocation failed, mark failure
  1404. } else {
  1405. va_copy(ap_copy, ap);
  1406. vsnprintf(*buf, size, fmt, ap_copy);
  1407. }
  1408. return len;
  1409. }
  1410. int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
  1411. char mem[MG_BUF_LEN], *buf = mem;
  1412. int len;
  1413. if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
  1414. len = mg_write(conn, buf, (size_t) len);
  1415. }
  1416. if (buf != mem && buf != NULL) {
  1417. free(buf);
  1418. }
  1419. return len;
  1420. }
  1421. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1422. va_list ap;
  1423. va_start(ap, fmt);
  1424. return mg_vprintf(conn, fmt, ap);
  1425. }
  1426. int mg_url_decode(const char *src, int src_len, char *dst,
  1427. int dst_len, int is_form_url_encoded) {
  1428. int i, j, a, b;
  1429. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1430. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1431. if (src[i] == '%' && i < src_len - 2 &&
  1432. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1433. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1434. a = tolower(* (const unsigned char *) (src + i + 1));
  1435. b = tolower(* (const unsigned char *) (src + i + 2));
  1436. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1437. i += 2;
  1438. } else if (is_form_url_encoded && src[i] == '+') {
  1439. dst[j] = ' ';
  1440. } else {
  1441. dst[j] = src[i];
  1442. }
  1443. }
  1444. dst[j] = '\0'; // Null-terminate the destination
  1445. return i >= src_len ? j : -1;
  1446. }
  1447. int mg_get_var(const char *data, size_t data_len, const char *name,
  1448. char *dst, size_t dst_len) {
  1449. const char *p, *e, *s;
  1450. size_t name_len;
  1451. int len;
  1452. if (dst == NULL || dst_len == 0) {
  1453. len = -2;
  1454. } else if (data == NULL || name == NULL || data_len == 0) {
  1455. len = -1;
  1456. dst[0] = '\0';
  1457. } else {
  1458. name_len = strlen(name);
  1459. e = data + data_len;
  1460. len = -1;
  1461. dst[0] = '\0';
  1462. // data is "var1=val1&var2=val2...". Find variable first
  1463. for (p = data; p + name_len < e; p++) {
  1464. if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
  1465. !mg_strncasecmp(name, p, name_len)) {
  1466. // Point p to variable value
  1467. p += name_len + 1;
  1468. // Point s to the end of the value
  1469. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1470. if (s == NULL) {
  1471. s = e;
  1472. }
  1473. assert(s >= p);
  1474. // Decode variable into destination buffer
  1475. len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1476. // Redirect error code from -1 to -2 (destination buffer too small).
  1477. if (len == -1) {
  1478. len = -2;
  1479. }
  1480. break;
  1481. }
  1482. }
  1483. }
  1484. return len;
  1485. }
  1486. int mg_get_cookie(const char *cookie_header, const char *var_name,
  1487. char *dst, size_t dst_size) {
  1488. const char *s, *p, *end;
  1489. int name_len, len = -1;
  1490. if (dst == NULL || dst_size == 0) {
  1491. len = -2;
  1492. } else if (var_name == NULL || (s = cookie_header) == NULL) {
  1493. len = -1;
  1494. dst[0] = '\0';
  1495. } else {
  1496. name_len = (int) strlen(var_name);
  1497. end = s + strlen(s);
  1498. dst[0] = '\0';
  1499. for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
  1500. if (s[name_len] == '=') {
  1501. s += name_len + 1;
  1502. if ((p = strchr(s, ' ')) == NULL)
  1503. p = end;
  1504. if (p[-1] == ';')
  1505. p--;
  1506. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1507. s++;
  1508. p--;
  1509. }
  1510. if ((size_t) (p - s) < dst_size) {
  1511. len = p - s;
  1512. mg_strlcpy(dst, s, (size_t) len + 1);
  1513. } else {
  1514. len = -3;
  1515. }
  1516. break;
  1517. }
  1518. }
  1519. }
  1520. return len;
  1521. }
  1522. static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1523. size_t buf_len, struct file *filep) {
  1524. struct vec a, b;
  1525. const char *rewrite, *uri = conn->request_info.uri;
  1526. char *p;
  1527. int match_len;
  1528. char gz_path[PATH_MAX];
  1529. char const* accept_encoding;
  1530. // Using buf_len - 1 because memmove() for PATH_INFO may shift part
  1531. // of the path one byte on the right.
  1532. mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
  1533. uri);
  1534. rewrite = conn->ctx->config[REWRITE];
  1535. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1536. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1537. mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
  1538. uri + match_len);
  1539. break;
  1540. }
  1541. }
  1542. if (mg_stat(conn, buf, filep)) return;
  1543. // if we can't find the actual file, look for the file
  1544. // with the same name but a .gz extension. If we find it,
  1545. // use that and set the gzipped flag in the file struct
  1546. // to indicate that the response need to have the content-
  1547. // encoding: gzip header
  1548. // we can only do this if the browser declares support
  1549. if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) {
  1550. if (strstr(accept_encoding,"gzip") != NULL) {
  1551. snprintf(gz_path, sizeof(gz_path), "%s.gz", buf);
  1552. if (mg_stat(conn, gz_path, filep)) {
  1553. filep->gzipped = 1;
  1554. return;
  1555. }
  1556. }
  1557. }
  1558. // Support PATH_INFO for CGI scripts.
  1559. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1560. if (*p == '/') {
  1561. *p = '\0';
  1562. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1563. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1564. mg_stat(conn, buf, filep)) {
  1565. // Shift PATH_INFO block one character right, e.g.
  1566. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1567. // conn->path_info is pointing to the local variable "path" declared
  1568. // in handle_request(), so PATH_INFO is not valid after
  1569. // handle_request returns.
  1570. conn->path_info = p + 1;
  1571. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1572. p[1] = '/';
  1573. break;
  1574. } else {
  1575. *p = '/';
  1576. }
  1577. }
  1578. }
  1579. }
  1580. // Check whether full request is buffered. Return:
  1581. // -1 if request is malformed
  1582. // 0 if request is not yet fully buffered
  1583. // >0 actual request length, including last \r\n\r\n
  1584. static int get_request_len(const char *buf, int buflen) {
  1585. const char *s, *e;
  1586. int len = 0;
  1587. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1588. // Control characters are not allowed but >=128 is.
  1589. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1590. *s != '\n' && * (const unsigned char *) s < 128) {
  1591. len = -1;
  1592. break; // [i_a] abort scan as soon as one malformed character is found;
  1593. // don't let subsequent \r\n\r\n win us over anyhow
  1594. } else if (s[0] == '\n' && s[1] == '\n') {
  1595. len = (int) (s - buf) + 2;
  1596. } else if (s[0] == '\n' && &s[1] < e &&
  1597. s[1] == '\r' && s[2] == '\n') {
  1598. len = (int) (s - buf) + 3;
  1599. }
  1600. return len;
  1601. }
  1602. // Convert month to the month number. Return -1 on error, or month number
  1603. static int get_month_index(const char *s) {
  1604. size_t i;
  1605. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1606. if (!strcmp(s, month_names[i]))
  1607. return (int) i;
  1608. return -1;
  1609. }
  1610. static int num_leap_years(int year) {
  1611. return year / 4 - year / 100 + year / 400;
  1612. }
  1613. // Parse UTC date-time string, and return the corresponding time_t value.
  1614. static time_t parse_date_string(const char *datetime) {
  1615. static const unsigned short days_before_month[] = {
  1616. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1617. };
  1618. char month_str[32];
  1619. int second, minute, hour, day, month, year, leap_days, days;
  1620. time_t result = (time_t) 0;
  1621. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1622. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1623. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1624. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1625. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1626. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1627. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1628. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1629. year > 1970 &&
  1630. (month = get_month_index(month_str)) != -1) {
  1631. leap_days = num_leap_years(year) - num_leap_years(1970);
  1632. year -= 1970;
  1633. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1634. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1635. }
  1636. return result;
  1637. }
  1638. // Protect against directory disclosure attack by removing '..',
  1639. // excessive '/' and '\' characters
  1640. static void remove_double_dots_and_double_slashes(char *s) {
  1641. char *p = s;
  1642. while (*s != '\0') {
  1643. *p++ = *s++;
  1644. if (s[-1] == '/' || s[-1] == '\\') {
  1645. // Skip all following slashes, backslashes and double-dots
  1646. while (s[0] != '\0') {
  1647. if (s[0] == '/' || s[0] == '\\') {
  1648. s++;
  1649. } else if (s[0] == '.' && s[1] == '.') {
  1650. s += 2;
  1651. } else {
  1652. break;
  1653. }
  1654. }
  1655. }
  1656. }
  1657. *p = '\0';
  1658. }
  1659. static const struct {
  1660. const char *extension;
  1661. size_t ext_len;
  1662. const char *mime_type;
  1663. } builtin_mime_types[] = {
  1664. {".html", 5, "text/html"},
  1665. {".htm", 4, "text/html"},
  1666. {".shtm", 5, "text/html"},
  1667. {".shtml", 6, "text/html"},
  1668. {".css", 4, "text/css"},
  1669. {".js", 3, "application/x-javascript"},
  1670. {".ico", 4, "image/x-icon"},
  1671. {".gif", 4, "image/gif"},
  1672. {".jpg", 4, "image/jpeg"},
  1673. {".jpeg", 5, "image/jpeg"},
  1674. {".png", 4, "image/png"},
  1675. {".svg", 4, "image/svg+xml"},
  1676. {".txt", 4, "text/plain"},
  1677. {".torrent", 8, "application/x-bittorrent"},
  1678. {".wav", 4, "audio/x-wav"},
  1679. {".mp3", 4, "audio/x-mp3"},
  1680. {".mid", 4, "audio/mid"},
  1681. {".m3u", 4, "audio/x-mpegurl"},
  1682. {".ogg", 4, "audio/ogg"},
  1683. {".ram", 4, "audio/x-pn-realaudio"},
  1684. {".xml", 4, "text/xml"},
  1685. {".json", 5, "text/json"},
  1686. {".xslt", 5, "application/xml"},
  1687. {".xsl", 4, "application/xml"},
  1688. {".ra", 3, "audio/x-pn-realaudio"},
  1689. {".doc", 4, "application/msword"},
  1690. {".exe", 4, "application/octet-stream"},
  1691. {".zip", 4, "application/x-zip-compressed"},
  1692. {".xls", 4, "application/excel"},
  1693. {".tgz", 4, "application/x-tar-gz"},
  1694. {".tar", 4, "application/x-tar"},
  1695. {".gz", 3, "application/x-gunzip"},
  1696. {".arj", 4, "application/x-arj-compressed"},
  1697. {".rar", 4, "application/x-arj-compressed"},
  1698. {".rtf", 4, "application/rtf"},
  1699. {".pdf", 4, "application/pdf"},
  1700. {".swf", 4, "application/x-shockwave-flash"},
  1701. {".mpg", 4, "video/mpeg"},
  1702. {".webm", 5, "video/webm"},
  1703. {".mpeg", 5, "video/mpeg"},
  1704. {".mov", 4, "video/quicktime"},
  1705. {".mp4", 4, "video/mp4"},
  1706. {".m4v", 4, "video/x-m4v"},
  1707. {".asf", 4, "video/x-ms-asf"},
  1708. {".avi", 4, "video/x-msvideo"},
  1709. {".bmp", 4, "image/bmp"},
  1710. {".ttf", 4, "application/x-font-ttf"},
  1711. {NULL, 0, NULL}
  1712. };
  1713. const char *mg_get_builtin_mime_type(const char *path) {
  1714. const char *ext;
  1715. size_t i, path_len;
  1716. path_len = strlen(path);
  1717. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1718. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1719. if (path_len > builtin_mime_types[i].ext_len &&
  1720. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1721. return builtin_mime_types[i].mime_type;
  1722. }
  1723. }
  1724. return "text/plain";
  1725. }
  1726. // Look at the "path" extension and figure what mime type it has.
  1727. // Store mime type in the vector.
  1728. static void get_mime_type(struct mg_context *ctx, const char *path,
  1729. struct vec *vec) {
  1730. struct vec ext_vec, mime_vec;
  1731. const char *list, *ext;
  1732. size_t path_len;
  1733. path_len = strlen(path);
  1734. // Scan user-defined mime types first, in case user wants to
  1735. // override default mime types.
  1736. list = ctx->config[EXTRA_MIME_TYPES];
  1737. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1738. // ext now points to the path suffix
  1739. ext = path + path_len - ext_vec.len;
  1740. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1741. *vec = mime_vec;
  1742. return;
  1743. }
  1744. }
  1745. vec->ptr = mg_get_builtin_mime_type(path);
  1746. vec->len = strlen(vec->ptr);
  1747. }
  1748. static int is_big_endian(void) {
  1749. static const int n = 1;
  1750. return ((char *) &n)[0] == 0;
  1751. }
  1752. #ifndef HAVE_MD5
  1753. typedef struct MD5Context {
  1754. uint32_t buf[4];
  1755. uint32_t bits[2];
  1756. unsigned char in[64];
  1757. } MD5_CTX;
  1758. static void byteReverse(unsigned char *buf, unsigned longs) {
  1759. uint32_t t;
  1760. // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
  1761. if (is_big_endian()) {
  1762. do {
  1763. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1764. ((unsigned) buf[1] << 8 | buf[0]);
  1765. * (uint32_t *) buf = t;
  1766. buf += 4;
  1767. } while (--longs);
  1768. }
  1769. }
  1770. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1771. #define F2(x, y, z) F1(z, x, y)
  1772. #define F3(x, y, z) (x ^ y ^ z)
  1773. #define F4(x, y, z) (y ^ (x | ~z))
  1774. #define MD5STEP(f, w, x, y, z, data, s) \
  1775. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1776. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1777. // initialization constants.
  1778. static void MD5Init(MD5_CTX *ctx) {
  1779. ctx->buf[0] = 0x67452301;
  1780. ctx->buf[1] = 0xefcdab89;
  1781. ctx->buf[2] = 0x98badcfe;
  1782. ctx->buf[3] = 0x10325476;
  1783. ctx->bits[0] = 0;
  1784. ctx->bits[1] = 0;
  1785. }
  1786. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1787. register uint32_t a, b, c, d;
  1788. a = buf[0];
  1789. b = buf[1];
  1790. c = buf[2];
  1791. d = buf[3];
  1792. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1793. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1794. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1795. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1796. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1797. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1798. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1799. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1800. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1801. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1802. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1803. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1804. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1805. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1806. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1807. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1808. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1809. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1810. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1811. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1812. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1813. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1814. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1815. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1816. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1817. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1818. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1819. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1820. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1821. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1822. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1823. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1824. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1825. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1826. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1827. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1828. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1829. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1830. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1831. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1832. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1833. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1834. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1835. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1836. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1837. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1838. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1839. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1840. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1841. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1842. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1843. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1844. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1845. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1846. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1847. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1848. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1849. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1850. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1851. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1852. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1853. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1854. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1855. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1856. buf[0] += a;
  1857. buf[1] += b;
  1858. buf[2] += c;
  1859. buf[3] += d;
  1860. }
  1861. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1862. uint32_t t;
  1863. t = ctx->bits[0];
  1864. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1865. ctx->bits[1]++;
  1866. ctx->bits[1] += len >> 29;
  1867. t = (t >> 3) & 0x3f;
  1868. if (t) {
  1869. unsigned char *p = (unsigned char *) ctx->in + t;
  1870. t = 64 - t;
  1871. if (len < t) {
  1872. memcpy(p, buf, len);
  1873. return;
  1874. }
  1875. memcpy(p, buf, t);
  1876. byteReverse(ctx->in, 16);
  1877. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1878. buf += t;
  1879. len -= t;
  1880. }
  1881. while (len >= 64) {
  1882. memcpy(ctx->in, buf, 64);
  1883. byteReverse(ctx->in, 16);
  1884. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1885. buf += 64;
  1886. len -= 64;
  1887. }
  1888. memcpy(ctx->in, buf, len);
  1889. }
  1890. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1891. unsigned count;
  1892. unsigned char *p;
  1893. uint32_t *a;
  1894. count = (ctx->bits[0] >> 3) & 0x3F;
  1895. p = ctx->in + count;
  1896. *p++ = 0x80;
  1897. count = 64 - 1 - count;
  1898. if (count < 8) {
  1899. memset(p, 0, count);
  1900. byteReverse(ctx->in, 16);
  1901. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1902. memset(ctx->in, 0, 56);
  1903. } else {
  1904. memset(p, 0, count - 8);
  1905. }
  1906. byteReverse(ctx->in, 14);
  1907. a = (uint32_t *)ctx->in;
  1908. a[14] = ctx->bits[0];
  1909. a[15] = ctx->bits[1];
  1910. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1911. byteReverse((unsigned char *) ctx->buf, 4);
  1912. memcpy(digest, ctx->buf, 16);
  1913. memset((char *) ctx, 0, sizeof(*ctx));
  1914. }
  1915. #endif // !HAVE_MD5
  1916. // Stringify binary data. Output buffer must be twice as big as input,
  1917. // because each byte takes 2 bytes in string representation
  1918. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1919. static const char *hex = "0123456789abcdef";
  1920. for (; len--; p++) {
  1921. *to++ = hex[p[0] >> 4];
  1922. *to++ = hex[p[0] & 0x0f];
  1923. }
  1924. *to = '\0';
  1925. }
  1926. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1927. char *mg_md5(char buf[33], ...) {
  1928. unsigned char hash[16];
  1929. const char *p;
  1930. va_list ap;
  1931. MD5_CTX ctx;
  1932. MD5Init(&ctx);
  1933. va_start(ap, buf);
  1934. while ((p = va_arg(ap, const char *)) != NULL) {
  1935. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1936. }
  1937. va_end(ap);
  1938. MD5Final(hash, &ctx);
  1939. bin2str(buf, hash, sizeof(hash));
  1940. return buf;
  1941. }
  1942. // Check the user's password, return 1 if OK
  1943. static int check_password(const char *method, const char *ha1, const char *uri,
  1944. const char *nonce, const char *nc, const char *cnonce,
  1945. const char *qop, const char *response) {
  1946. char ha2[32 + 1], expected_response[32 + 1];
  1947. // Some of the parameters may be NULL
  1948. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1949. qop == NULL || response == NULL) {
  1950. return 0;
  1951. }
  1952. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1953. // TODO(lsm): check for authentication timeout
  1954. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1955. strlen(response) != 32
  1956. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1957. ) {
  1958. return 0;
  1959. }
  1960. mg_md5(ha2, method, ":", uri, NULL);
  1961. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1962. ":", cnonce, ":", qop, ":", ha2, NULL);
  1963. return mg_strcasecmp(response, expected_response) == 0;
  1964. }
  1965. // Use the global passwords file, if specified by auth_gpass option,
  1966. // or search for .htpasswd in the requested directory.
  1967. static void open_auth_file(struct mg_connection *conn, const char *path,
  1968. struct file *filep) {
  1969. char name[PATH_MAX];
  1970. const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
  1971. struct file file = STRUCT_FILE_INITIALIZER;
  1972. if (gpass != NULL) {
  1973. // Use global passwords file
  1974. if (!mg_fopen(conn, gpass, "r", filep)) {
  1975. cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
  1976. }
  1977. // Important: using local struct file to test path for is_directory flag.
  1978. // If filep is used, mg_stat() makes it appear as if auth file was opened.
  1979. } else if (mg_stat(conn, path, &file) && file.is_directory) {
  1980. mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1981. path, '/', PASSWORDS_FILE_NAME);
  1982. mg_fopen(conn, name, "r", filep);
  1983. } else {
  1984. // Try to find .htpasswd in requested directory.
  1985. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1986. if (e[0] == '/')
  1987. break;
  1988. mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1989. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  1990. mg_fopen(conn, name, "r", filep);
  1991. }
  1992. }
  1993. // Parsed Authorization header
  1994. struct ah {
  1995. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1996. };
  1997. // Return 1 on success. Always initializes the ah structure.
  1998. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1999. size_t buf_size, struct ah *ah) {
  2000. char *name, *value, *s;
  2001. const char *auth_header;
  2002. (void) memset(ah, 0, sizeof(*ah));
  2003. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  2004. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  2005. return 0;
  2006. }
  2007. // Make modifiable copy of the auth header
  2008. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  2009. s = buf;
  2010. // Parse authorization header
  2011. for (;;) {
  2012. // Gobble initial spaces
  2013. while (isspace(* (unsigned char *) s)) {
  2014. s++;
  2015. }
  2016. name = skip_quoted(&s, "=", " ", 0);
  2017. // Value is either quote-delimited, or ends at first comma or space.
  2018. if (s[0] == '\"') {
  2019. s++;
  2020. value = skip_quoted(&s, "\"", " ", '\\');
  2021. if (s[0] == ',') {
  2022. s++;
  2023. }
  2024. } else {
  2025. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  2026. }
  2027. if (*name == '\0') {
  2028. break;
  2029. }
  2030. if (!strcmp(name, "username")) {
  2031. ah->user = value;
  2032. } else if (!strcmp(name, "cnonce")) {
  2033. ah->cnonce = value;
  2034. } else if (!strcmp(name, "response")) {
  2035. ah->response = value;
  2036. } else if (!strcmp(name, "uri")) {
  2037. ah->uri = value;
  2038. } else if (!strcmp(name, "qop")) {
  2039. ah->qop = value;
  2040. } else if (!strcmp(name, "nc")) {
  2041. ah->nc = value;
  2042. } else if (!strcmp(name, "nonce")) {
  2043. ah->nonce = value;
  2044. }
  2045. }
  2046. // CGI needs it as REMOTE_USER
  2047. if (ah->user != NULL) {
  2048. conn->request_info.remote_user = mg_strdup(ah->user);
  2049. } else {
  2050. return 0;
  2051. }
  2052. return 1;
  2053. }
  2054. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
  2055. char *eof;
  2056. size_t len;
  2057. if (filep->membuf != NULL && *p != NULL) {
  2058. eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
  2059. len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
  2060. memcpy(buf, *p, len);
  2061. buf[len] = '\0';
  2062. *p = eof;
  2063. return eof;
  2064. } else if (filep->fp != NULL) {
  2065. return fgets(buf, size, filep->fp);
  2066. } else {
  2067. return NULL;
  2068. }
  2069. }
  2070. // Authorize against the opened passwords file. Return 1 if authorized.
  2071. static int authorize(struct mg_connection *conn, struct file *filep) {
  2072. struct ah ah;
  2073. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
  2074. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  2075. return 0;
  2076. }
  2077. // Loop over passwords file
  2078. p = (char *) filep->membuf;
  2079. while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
  2080. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  2081. continue;
  2082. }
  2083. if (!strcmp(ah.user, f_user) &&
  2084. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  2085. return check_password(conn->request_info.request_method, ha1, ah.uri,
  2086. ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
  2087. }
  2088. return 0;
  2089. }
  2090. // Return 1 if request is authorised, 0 otherwise.
  2091. static int check_authorization(struct mg_connection *conn, const char *path) {
  2092. char fname[PATH_MAX];
  2093. struct vec uri_vec, filename_vec;
  2094. const char *list;
  2095. struct file file = STRUCT_FILE_INITIALIZER;
  2096. int authorized = 1;
  2097. list = conn->ctx->config[PROTECT_URI];
  2098. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  2099. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  2100. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2101. (int) filename_vec.len, filename_vec.ptr);
  2102. if (!mg_fopen(conn, fname, "r", &file)) {
  2103. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2104. }
  2105. break;
  2106. }
  2107. }
  2108. if (!is_file_opened(&file)) {
  2109. open_auth_file(conn, path, &file);
  2110. }
  2111. if (is_file_opened(&file)) {
  2112. authorized = authorize(conn, &file);
  2113. mg_fclose(&file);
  2114. }
  2115. return authorized;
  2116. }
  2117. static void send_authorization_request(struct mg_connection *conn) {
  2118. conn->status_code = 401;
  2119. mg_printf(conn,
  2120. "HTTP/1.1 401 Unauthorized\r\n"
  2121. "Content-Length: 0\r\n"
  2122. "WWW-Authenticate: Digest qop=\"auth\", "
  2123. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2124. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2125. (unsigned long) time(NULL));
  2126. }
  2127. static int is_authorized_for_put(struct mg_connection *conn) {
  2128. struct file file = STRUCT_FILE_INITIALIZER;
  2129. const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
  2130. int ret = 0;
  2131. if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
  2132. ret = authorize(conn, &file);
  2133. mg_fclose(&file);
  2134. }
  2135. return ret;
  2136. }
  2137. int mg_modify_passwords_file(const char *fname, const char *domain,
  2138. const char *user, const char *pass) {
  2139. int found;
  2140. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2141. FILE *fp, *fp2;
  2142. found = 0;
  2143. fp = fp2 = NULL;
  2144. // Regard empty password as no password - remove user record.
  2145. if (pass != NULL && pass[0] == '\0') {
  2146. pass = NULL;
  2147. }
  2148. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2149. // Create the file if does not exist
  2150. if ((fp = fopen(fname, "a+")) != NULL) {
  2151. (void) fclose(fp);
  2152. }
  2153. // Open the given file and temporary file
  2154. if ((fp = fopen(fname, "r")) == NULL) {
  2155. return 0;
  2156. } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
  2157. fclose(fp);
  2158. return 0;
  2159. }
  2160. // Copy the stuff to temporary file
  2161. while (fgets(line, sizeof(line), fp) != NULL) {
  2162. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2163. continue;
  2164. }
  2165. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2166. found++;
  2167. if (pass != NULL) {
  2168. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2169. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2170. }
  2171. } else {
  2172. fprintf(fp2, "%s", line);
  2173. }
  2174. }
  2175. // If new user, just add it
  2176. if (!found && pass != NULL) {
  2177. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2178. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2179. }
  2180. // Close files
  2181. fclose(fp);
  2182. fclose(fp2);
  2183. // Put the temp file in place of real file
  2184. remove(fname);
  2185. rename(tmp, fname);
  2186. return 1;
  2187. }
  2188. static SOCKET conn2(const char *host, int port, int use_ssl,
  2189. char *ebuf, size_t ebuf_len) {
  2190. struct sockaddr_in sin;
  2191. struct hostent *he;
  2192. SOCKET sock = INVALID_SOCKET;
  2193. if (host == NULL) {
  2194. snprintf(ebuf, ebuf_len, "%s", "NULL host");
  2195. } else if (use_ssl && SSLv23_client_method == NULL) {
  2196. snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
  2197. // TODO(lsm): use something threadsafe instead of gethostbyname()
  2198. } else if ((he = gethostbyname(host)) == NULL) {
  2199. snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
  2200. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  2201. snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
  2202. } else {
  2203. set_close_on_exec(sock);
  2204. sin.sin_family = AF_INET;
  2205. sin.sin_port = htons((uint16_t) port);
  2206. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  2207. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  2208. snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
  2209. host, port, strerror(ERRNO));
  2210. closesocket(sock);
  2211. sock = INVALID_SOCKET;
  2212. }
  2213. }
  2214. return sock;
  2215. }
  2216. void mg_url_encode(const char *src, char *dst, size_t dst_len) {
  2217. static const char *dont_escape = "._-$,;~()";
  2218. static const char *hex = "0123456789abcdef";
  2219. const char *end = dst + dst_len - 1;
  2220. for (; *src != '\0' && dst < end; src++, dst++) {
  2221. if (isalnum(*(const unsigned char *) src) ||
  2222. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2223. *dst = *src;
  2224. } else if (dst + 2 < end) {
  2225. dst[0] = '%';
  2226. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2227. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2228. dst += 2;
  2229. }
  2230. }
  2231. *dst = '\0';
  2232. }
  2233. static void print_dir_entry(struct de *de) {
  2234. char size[64], mod[64], href[PATH_MAX];
  2235. if (de->file.is_directory) {
  2236. mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2237. } else {
  2238. // We use (signed) cast below because MSVC 6 compiler cannot
  2239. // convert unsigned __int64 to double. Sigh.
  2240. if (de->file.size < 1024) {
  2241. mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
  2242. } else if (de->file.size < 0x100000) {
  2243. mg_snprintf(de->conn, size, sizeof(size),
  2244. "%.1fk", (double) de->file.size / 1024.0);
  2245. } else if (de->file.size < 0x40000000) {
  2246. mg_snprintf(de->conn, size, sizeof(size),
  2247. "%.1fM", (double) de->file.size / 1048576);
  2248. } else {
  2249. mg_snprintf(de->conn, size, sizeof(size),
  2250. "%.1fG", (double) de->file.size / 1073741824);
  2251. }
  2252. }
  2253. strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
  2254. localtime(&de->file.modification_time));
  2255. mg_url_encode(de->file_name, href, sizeof(href));
  2256. de->conn->num_bytes_sent += mg_printf(de->conn,
  2257. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2258. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2259. de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
  2260. de->file_name, de->file.is_directory ? "/" : "", mod, size);
  2261. }
  2262. // This function is called from send_directory() and used for
  2263. // sorting directory entries by size, or name, or modification time.
  2264. // On windows, __cdecl specification is needed in case if project is built
  2265. // with __stdcall convention. qsort always requires __cdels callback.
  2266. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2267. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2268. const char *query_string = a->conn->request_info.query_string;
  2269. int cmp_result = 0;
  2270. if (query_string == NULL) {
  2271. query_string = "na";
  2272. }
  2273. if (a->file.is_directory && !b->file.is_directory) {
  2274. return -1; // Always put directories on top
  2275. } else if (!a->file.is_directory && b->file.is_directory) {
  2276. return 1; // Always put directories on top
  2277. } else if (*query_string == 'n') {
  2278. cmp_result = strcmp(a->file_name, b->file_name);
  2279. } else if (*query_string == 's') {
  2280. cmp_result = a->file.size == b->file.size ? 0 :
  2281. a->file.size > b->file.size ? 1 : -1;
  2282. } else if (*query_string == 'd') {
  2283. cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
  2284. a->file.modification_time > b->file.modification_time ? 1 : -1;
  2285. }
  2286. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2287. }
  2288. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2289. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2290. const char *pattern = conn->ctx->config[HIDE_FILES];
  2291. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2292. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2293. }
  2294. static int scan_directory(struct mg_connection *conn, const char *dir,
  2295. void *data, void (*cb)(struct de *, void *)) {
  2296. char path[PATH_MAX];
  2297. struct dirent *dp;
  2298. DIR *dirp;
  2299. struct de de;
  2300. if ((dirp = opendir(dir)) == NULL) {
  2301. return 0;
  2302. } else {
  2303. de.conn = conn;
  2304. while ((dp = readdir(dirp)) != NULL) {
  2305. // Do not show current dir and hidden files
  2306. if (!strcmp(dp->d_name, ".") ||
  2307. !strcmp(dp->d_name, "..") ||
  2308. must_hide_file(conn, dp->d_name)) {
  2309. continue;
  2310. }
  2311. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2312. // If we don't memset stat structure to zero, mtime will have
  2313. // garbage and strftime() will segfault later on in
  2314. // print_dir_entry(). memset is required only if mg_stat()
  2315. // fails. For more details, see
  2316. // http://code.google.com/p/mongoose/issues/detail?id=79
  2317. memset(&de.file, 0, sizeof(de.file));
  2318. mg_stat(conn, path, &de.file);
  2319. de.file_name = dp->d_name;
  2320. cb(&de, data);
  2321. }
  2322. (void) closedir(dirp);
  2323. }
  2324. return 1;
  2325. }
  2326. static int remove_directory(struct mg_connection *conn, const char *dir) {
  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 (but show hidden files as they will also be removed)
  2337. if (!strcmp(dp->d_name, ".") ||
  2338. !strcmp(dp->d_name, "..")) {
  2339. continue;
  2340. }
  2341. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2342. // If we don't memset stat structure to zero, mtime will have
  2343. // garbage and strftime() will segfault later on in
  2344. // print_dir_entry(). memset is required only if mg_stat()
  2345. // fails. For more details, see
  2346. // http://code.google.com/p/mongoose/issues/detail?id=79
  2347. memset(&de.file, 0, sizeof(de.file));
  2348. mg_stat(conn, path, &de.file);
  2349. if(de.file.modification_time) {
  2350. if(de.file.is_directory) {
  2351. remove_directory(conn, path);
  2352. } else {
  2353. mg_remove(path);
  2354. }
  2355. }
  2356. }
  2357. (void) closedir(dirp);
  2358. rmdir(dir);
  2359. }
  2360. return 1;
  2361. }
  2362. struct dir_scan_data {
  2363. struct de *entries;
  2364. int num_entries;
  2365. int arr_size;
  2366. };
  2367. // Behaves like realloc(), but frees original pointer on failure
  2368. static void *realloc2(void *ptr, size_t size) {
  2369. void *new_ptr = realloc(ptr, size);
  2370. if (new_ptr == NULL) {
  2371. free(ptr);
  2372. }
  2373. return new_ptr;
  2374. }
  2375. static void dir_scan_callback(struct de *de, void *data) {
  2376. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2377. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2378. dsd->arr_size *= 2;
  2379. dsd->entries = (struct de *) realloc2(dsd->entries, dsd->arr_size *
  2380. sizeof(dsd->entries[0]));
  2381. }
  2382. if (dsd->entries == NULL) {
  2383. // TODO(lsm): propagate an error to the caller
  2384. dsd->num_entries = 0;
  2385. } else {
  2386. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2387. dsd->entries[dsd->num_entries].file = de->file;
  2388. dsd->entries[dsd->num_entries].conn = de->conn;
  2389. dsd->num_entries++;
  2390. }
  2391. }
  2392. static void handle_directory_request(struct mg_connection *conn,
  2393. const char *dir) {
  2394. int i, sort_direction;
  2395. struct dir_scan_data data = { NULL, 0, 128 };
  2396. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2397. send_http_error(conn, 500, "Cannot open directory",
  2398. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2399. return;
  2400. }
  2401. sort_direction = conn->request_info.query_string != NULL &&
  2402. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2403. conn->must_close = 1;
  2404. mg_printf(conn, "%s",
  2405. "HTTP/1.1 200 OK\r\n"
  2406. "Connection: close\r\n"
  2407. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2408. conn->num_bytes_sent += mg_printf(conn,
  2409. "<html><head><title>Index of %s</title>"
  2410. "<style>th {text-align: left;}</style></head>"
  2411. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2412. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2413. "<th><a href=\"?d%c\">Modified</a></th>"
  2414. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2415. "<tr><td colspan=\"3\"><hr></td></tr>",
  2416. conn->request_info.uri, conn->request_info.uri,
  2417. sort_direction, sort_direction, sort_direction);
  2418. // Print first entry - link to a parent directory
  2419. conn->num_bytes_sent += mg_printf(conn,
  2420. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2421. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2422. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2423. // Sort and print directory entries
  2424. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2425. compare_dir_entries);
  2426. for (i = 0; i < data.num_entries; i++) {
  2427. print_dir_entry(&data.entries[i]);
  2428. free(data.entries[i].file_name);
  2429. }
  2430. free(data.entries);
  2431. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2432. conn->status_code = 200;
  2433. }
  2434. // Send len bytes from the opened file to the client.
  2435. static void send_file_data(struct mg_connection *conn, struct file *filep,
  2436. int64_t offset, int64_t len) {
  2437. char buf[MG_BUF_LEN];
  2438. int to_read, num_read, num_written;
  2439. // Sanity check the offset
  2440. offset = offset < 0 ? 0 : offset > filep->size ? filep->size : offset;
  2441. if (len > 0 && filep->membuf != NULL && filep->size > 0) {
  2442. if (len > filep->size - offset) {
  2443. len = filep->size - offset;
  2444. }
  2445. mg_write(conn, filep->membuf + offset, (size_t) len);
  2446. } else if (len > 0 && filep->fp != NULL) {
  2447. fseeko(filep->fp, offset, SEEK_SET);
  2448. while (len > 0) {
  2449. // Calculate how much to read from the file in the buffer
  2450. to_read = sizeof(buf);
  2451. if ((int64_t) to_read > len) {
  2452. to_read = (int) len;
  2453. }
  2454. // Read from file, exit the loop on error
  2455. if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
  2456. break;
  2457. }
  2458. // Send read bytes to the client, exit the loop on error
  2459. if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
  2460. break;
  2461. }
  2462. // Both read and were successful, adjust counters
  2463. conn->num_bytes_sent += num_written;
  2464. len -= num_written;
  2465. }
  2466. }
  2467. }
  2468. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2469. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2470. }
  2471. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2472. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2473. }
  2474. static void construct_etag(char *buf, size_t buf_len,
  2475. const struct file *filep) {
  2476. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2477. (unsigned long) filep->modification_time, filep->size);
  2478. }
  2479. static void fclose_on_exec(struct file *filep) {
  2480. if (filep != NULL && filep->fp != NULL) {
  2481. #ifndef _WIN32
  2482. fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
  2483. #endif
  2484. }
  2485. }
  2486. static void handle_file_request(struct mg_connection *conn, const char *path,
  2487. struct file *filep) {
  2488. char date[64], lm[64], etag[64], range[64];
  2489. const char *msg = "OK", *hdr;
  2490. time_t curtime = time(NULL);
  2491. int64_t cl, r1, r2;
  2492. struct vec mime_vec;
  2493. int n;
  2494. char gz_path[PATH_MAX];
  2495. char const* encoding = "";
  2496. get_mime_type(conn->ctx, path, &mime_vec);
  2497. cl = filep->size;
  2498. conn->status_code = 200;
  2499. range[0] = '\0';
  2500. // if this file is in fact a pre-gzipped file, rewrite its filename
  2501. // it's important to rewrite the filename after resolving
  2502. // the mime type from it, to preserve the actual file's type
  2503. if (filep->gzipped) {
  2504. snprintf(gz_path, sizeof(gz_path), "%s.gz", path);
  2505. path = gz_path;
  2506. encoding = "Content-Encoding: gzip\r\n";
  2507. }
  2508. if (!mg_fopen(conn, path, "rb", filep)) {
  2509. send_http_error(conn, 500, http_500_error,
  2510. "fopen(%s): %s", path, strerror(ERRNO));
  2511. return;
  2512. }
  2513. fclose_on_exec(filep);
  2514. // If Range: header specified, act accordingly
  2515. r1 = r2 = 0;
  2516. hdr = mg_get_header(conn, "Range");
  2517. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
  2518. r1 >= 0 && r2 >= 0) {
  2519. // actually, range requests don't play well with a pre-gzipped
  2520. // file (since the range is specified in the uncmpressed space)
  2521. if (filep->gzipped) {
  2522. send_http_error(conn, 501, "Not Implemented", "range requests in gzipped files are not supported");
  2523. return;
  2524. }
  2525. conn->status_code = 206;
  2526. cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
  2527. mg_snprintf(conn, range, sizeof(range),
  2528. "Content-Range: bytes "
  2529. "%" INT64_FMT "-%"
  2530. INT64_FMT "/%" INT64_FMT "\r\n",
  2531. r1, r1 + cl - 1, filep->size);
  2532. msg = "Partial Content";
  2533. }
  2534. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2535. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2536. gmt_time_string(date, sizeof(date), &curtime);
  2537. gmt_time_string(lm, sizeof(lm), &filep->modification_time);
  2538. construct_etag(etag, sizeof(etag), filep);
  2539. (void) mg_printf(conn,
  2540. "HTTP/1.1 %d %s\r\n"
  2541. "Date: %s\r\n"
  2542. "Last-Modified: %s\r\n"
  2543. "Etag: %s\r\n"
  2544. "Content-Type: %.*s\r\n"
  2545. "Content-Length: %" INT64_FMT "\r\n"
  2546. "Connection: %s\r\n"
  2547. "Accept-Ranges: bytes\r\n"
  2548. "%s%s\r\n",
  2549. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2550. mime_vec.ptr, cl, suggest_connection_header(conn), range, encoding);
  2551. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2552. send_file_data(conn, filep, r1, cl);
  2553. }
  2554. mg_fclose(filep);
  2555. }
  2556. void mg_send_file(struct mg_connection *conn, const char *path) {
  2557. struct file file = STRUCT_FILE_INITIALIZER;
  2558. if (mg_stat(conn, path, &file)) {
  2559. handle_file_request(conn, path, &file);
  2560. } else {
  2561. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2562. }
  2563. }
  2564. // Parse HTTP headers from the given buffer, advance buffer to the point
  2565. // where parsing stopped.
  2566. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2567. int i;
  2568. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2569. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2570. ri->http_headers[i].value = skip(buf, "\r\n");
  2571. if (ri->http_headers[i].name[0] == '\0')
  2572. break;
  2573. ri->num_headers = i + 1;
  2574. }
  2575. }
  2576. static int is_valid_http_method(const char *method) {
  2577. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2578. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2579. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2580. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
  2581. || !strcmp(method, "MKCOL")
  2582. ;
  2583. }
  2584. // Parse HTTP request, fill in mg_request_info structure.
  2585. // This function modifies the buffer by NUL-terminating
  2586. // HTTP request components, header names and header values.
  2587. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2588. int is_request, request_length = get_request_len(buf, len);
  2589. if (request_length > 0) {
  2590. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2591. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2592. ri->num_headers = 0;
  2593. buf[request_length - 1] = '\0';
  2594. // RFC says that all initial whitespaces should be ingored
  2595. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2596. buf++;
  2597. }
  2598. ri->request_method = skip(&buf, " ");
  2599. ri->uri = skip(&buf, " ");
  2600. ri->http_version = skip(&buf, "\r\n");
  2601. if (((is_request = is_valid_http_method(ri->request_method)) &&
  2602. memcmp(ri->http_version, "HTTP/", 5) != 0) ||
  2603. (!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {
  2604. request_length = -1;
  2605. } else {
  2606. if (is_request) {
  2607. ri->http_version += 5;
  2608. }
  2609. parse_http_headers(&buf, ri);
  2610. }
  2611. }
  2612. return request_length;
  2613. }
  2614. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2615. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2616. // buffer (which marks the end of HTTP request). Buffer buf may already
  2617. // have some data. The length of the data is stored in nread.
  2618. // Upon every read operation, increase nread by the number of bytes read.
  2619. static int read_request(FILE *fp, struct mg_connection *conn,
  2620. char *buf, int bufsiz, int *nread) {
  2621. int request_len, n = 0;
  2622. request_len = get_request_len(buf, *nread);
  2623. while (conn->ctx->stop_flag == 0 &&
  2624. *nread < bufsiz && request_len == 0 &&
  2625. (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
  2626. *nread += n;
  2627. assert(*nread <= bufsiz);
  2628. request_len = get_request_len(buf, *nread);
  2629. }
  2630. return request_len <= 0 && n <= 0 ? -1 : request_len;
  2631. }
  2632. // For given directory path, substitute it to valid index file.
  2633. // Return 0 if index file has been found, -1 if not found.
  2634. // If the file is found, it's stats is returned in stp.
  2635. static int substitute_index_file(struct mg_connection *conn, char *path,
  2636. size_t path_len, struct file *filep) {
  2637. const char *list = conn->ctx->config[INDEX_FILES];
  2638. struct file file = STRUCT_FILE_INITIALIZER;
  2639. struct vec filename_vec;
  2640. size_t n = strlen(path);
  2641. int found = 0;
  2642. // The 'path' given to us points to the directory. Remove all trailing
  2643. // directory separator characters from the end of the path, and
  2644. // then append single directory separator character.
  2645. while (n > 0 && path[n - 1] == '/') {
  2646. n--;
  2647. }
  2648. path[n] = '/';
  2649. // Traverse index files list. For each entry, append it to the given
  2650. // path and see if the file exists. If it exists, break the loop
  2651. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2652. // Ignore too long entries that may overflow path buffer
  2653. if (filename_vec.len > path_len - (n + 2))
  2654. continue;
  2655. // Prepare full path to the index file
  2656. mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2657. // Does it exist?
  2658. if (mg_stat(conn, path, &file)) {
  2659. // Yes it does, break the loop
  2660. *filep = file;
  2661. found = 1;
  2662. break;
  2663. }
  2664. }
  2665. // If no index file exists, restore directory path
  2666. if (!found) {
  2667. path[n] = '\0';
  2668. }
  2669. return found;
  2670. }
  2671. // Return True if we should reply 304 Not Modified.
  2672. static int is_not_modified(const struct mg_connection *conn,
  2673. const struct file *filep) {
  2674. char etag[64];
  2675. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2676. const char *inm = mg_get_header(conn, "If-None-Match");
  2677. construct_etag(etag, sizeof(etag), filep);
  2678. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2679. (ims != NULL && filep->modification_time <= parse_date_string(ims));
  2680. }
  2681. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2682. SOCKET sock, SSL *ssl) {
  2683. const char *expect, *body;
  2684. char buf[MG_BUF_LEN];
  2685. int to_read, nread, buffered_len, success = 0;
  2686. expect = mg_get_header(conn, "Expect");
  2687. assert(fp != NULL);
  2688. if (conn->content_len == -1) {
  2689. send_http_error(conn, 411, "Length Required", "%s", "");
  2690. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2691. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2692. } else {
  2693. if (expect != NULL) {
  2694. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2695. }
  2696. body = conn->buf + conn->request_len + conn->consumed_content;
  2697. buffered_len = &conn->buf[conn->data_len] - body;
  2698. assert(buffered_len >= 0);
  2699. assert(conn->consumed_content == 0);
  2700. if (buffered_len > 0) {
  2701. if ((int64_t) buffered_len > conn->content_len) {
  2702. buffered_len = (int) conn->content_len;
  2703. }
  2704. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2705. conn->consumed_content += buffered_len;
  2706. }
  2707. nread = 0;
  2708. while (conn->consumed_content < conn->content_len) {
  2709. to_read = sizeof(buf);
  2710. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2711. to_read = (int) (conn->content_len - conn->consumed_content);
  2712. }
  2713. nread = pull(NULL, conn, buf, to_read);
  2714. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2715. break;
  2716. }
  2717. conn->consumed_content += nread;
  2718. }
  2719. if (conn->consumed_content == conn->content_len) {
  2720. success = nread >= 0;
  2721. }
  2722. // Each error code path in this function must send an error
  2723. if (!success) {
  2724. send_http_error(conn, 577, http_500_error, "%s", "");
  2725. }
  2726. }
  2727. return success;
  2728. }
  2729. #if !defined(NO_CGI)
  2730. // This structure helps to create an environment for the spawned CGI program.
  2731. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2732. // last element must be NULL.
  2733. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2734. // strings must reside in a contiguous buffer. The end of the buffer is
  2735. // marked by two '\0' characters.
  2736. // We satisfy both worlds: we create an envp array (which is vars), all
  2737. // entries are actually pointers inside buf.
  2738. struct cgi_env_block {
  2739. struct mg_connection *conn;
  2740. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2741. int len; // Space taken
  2742. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2743. int nvars; // Number of variables
  2744. };
  2745. static char *addenv(struct cgi_env_block *block,
  2746. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2747. PRINTF_ARGS(2, 3);
  2748. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2749. // pointer into the vars array.
  2750. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2751. int n, space;
  2752. char *added;
  2753. va_list ap;
  2754. // Calculate how much space is left in the buffer
  2755. space = sizeof(block->buf) - block->len - 2;
  2756. assert(space >= 0);
  2757. // Make a pointer to the free space int the buffer
  2758. added = block->buf + block->len;
  2759. // Copy VARIABLE=VALUE\0 string into the free space
  2760. va_start(ap, fmt);
  2761. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2762. va_end(ap);
  2763. // Make sure we do not overflow buffer and the envp array
  2764. if (n > 0 && n + 1 < space &&
  2765. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2766. // Append a pointer to the added string into the envp array
  2767. block->vars[block->nvars++] = added;
  2768. // Bump up used length counter. Include \0 terminator
  2769. block->len += n + 1;
  2770. } else {
  2771. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2772. }
  2773. return added;
  2774. }
  2775. static void prepare_cgi_environment(struct mg_connection *conn,
  2776. const char *prog,
  2777. struct cgi_env_block *blk) {
  2778. const char *s, *slash;
  2779. struct vec var_vec;
  2780. char *p, src_addr[IP_ADDR_STR_LEN];
  2781. int i;
  2782. blk->len = blk->nvars = 0;
  2783. blk->conn = conn;
  2784. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2785. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2786. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2787. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2788. // Prepare the environment block
  2789. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2790. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2791. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2792. // TODO(lsm): fix this for IPv6 case
  2793. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2794. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2795. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2796. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2797. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2798. // SCRIPT_NAME
  2799. assert(conn->request_info.uri[0] == '/');
  2800. slash = strrchr(conn->request_info.uri, '/');
  2801. if ((s = strrchr(prog, '/')) == NULL)
  2802. s = prog;
  2803. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2804. conn->request_info.uri, s);
  2805. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2806. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2807. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2808. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2809. addenv(blk, "CONTENT_TYPE=%s", s);
  2810. if (conn->request_info.query_string != NULL)
  2811. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2812. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2813. addenv(blk, "CONTENT_LENGTH=%s", s);
  2814. if ((s = getenv("PATH")) != NULL)
  2815. addenv(blk, "PATH=%s", s);
  2816. if (conn->path_info != NULL) {
  2817. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2818. }
  2819. #if defined(_WIN32)
  2820. if ((s = getenv("COMSPEC")) != NULL) {
  2821. addenv(blk, "COMSPEC=%s", s);
  2822. }
  2823. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2824. addenv(blk, "SYSTEMROOT=%s", s);
  2825. }
  2826. if ((s = getenv("SystemDrive")) != NULL) {
  2827. addenv(blk, "SystemDrive=%s", s);
  2828. }
  2829. if ((s = getenv("ProgramFiles")) != NULL) {
  2830. addenv(blk, "ProgramFiles=%s", s);
  2831. }
  2832. if ((s = getenv("ProgramFiles(x86)")) != NULL) {
  2833. addenv(blk, "ProgramFiles(x86)=%s", s);
  2834. }
  2835. #else
  2836. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2837. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2838. #endif // _WIN32
  2839. if ((s = getenv("PERLLIB")) != NULL)
  2840. addenv(blk, "PERLLIB=%s", s);
  2841. if (conn->request_info.remote_user != NULL) {
  2842. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2843. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2844. }
  2845. // Add all headers as HTTP_* variables
  2846. for (i = 0; i < conn->request_info.num_headers; i++) {
  2847. p = addenv(blk, "HTTP_%s=%s",
  2848. conn->request_info.http_headers[i].name,
  2849. conn->request_info.http_headers[i].value);
  2850. // Convert variable name into uppercase, and change - to _
  2851. for (; *p != '=' && *p != '\0'; p++) {
  2852. if (*p == '-')
  2853. *p = '_';
  2854. *p = (char) toupper(* (unsigned char *) p);
  2855. }
  2856. }
  2857. // Add user-specified variables
  2858. s = conn->ctx->config[CGI_ENVIRONMENT];
  2859. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2860. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2861. }
  2862. blk->vars[blk->nvars++] = NULL;
  2863. blk->buf[blk->len++] = '\0';
  2864. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2865. assert(blk->len > 0);
  2866. assert(blk->len < (int) sizeof(blk->buf));
  2867. }
  2868. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2869. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2870. const char *status, *status_text;
  2871. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2872. struct mg_request_info ri;
  2873. struct cgi_env_block blk;
  2874. FILE *in, *out;
  2875. struct file fout = STRUCT_FILE_INITIALIZER;
  2876. pid_t pid;
  2877. prepare_cgi_environment(conn, prog, &blk);
  2878. // CGI must be executed in its own directory. 'dir' must point to the
  2879. // directory containing executable program, 'p' must point to the
  2880. // executable program name relative to 'dir'.
  2881. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2882. if ((p = strrchr(dir, '/')) != NULL) {
  2883. *p++ = '\0';
  2884. } else {
  2885. dir[0] = '.', dir[1] = '\0';
  2886. p = (char *) prog;
  2887. }
  2888. pid = (pid_t) -1;
  2889. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2890. in = out = NULL;
  2891. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2892. send_http_error(conn, 500, http_500_error,
  2893. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2894. goto done;
  2895. }
  2896. pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
  2897. dir);
  2898. // spawn_process() must close those!
  2899. // If we don't mark them as closed, close() attempt before
  2900. // return from this function throws an exception on Windows.
  2901. // Windows does not like when closed descriptor is closed again.
  2902. fd_stdin[0] = fd_stdout[1] = -1;
  2903. if (pid == (pid_t) -1) {
  2904. send_http_error(conn, 500, http_500_error,
  2905. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2906. goto done;
  2907. }
  2908. if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2909. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2910. send_http_error(conn, 500, http_500_error,
  2911. "fopen: %s", strerror(ERRNO));
  2912. goto done;
  2913. }
  2914. setbuf(in, NULL);
  2915. setbuf(out, NULL);
  2916. fout.fp = out;
  2917. // Send POST data to the CGI process if needed
  2918. if (!strcmp(conn->request_info.request_method, "POST") &&
  2919. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2920. goto done;
  2921. }
  2922. // Close so child gets an EOF.
  2923. fclose(in);
  2924. in = NULL;
  2925. fd_stdin[1] = -1;
  2926. // Now read CGI reply into a buffer. We need to set correct
  2927. // status code, thus we need to see all HTTP headers first.
  2928. // Do not send anything back to client, until we buffer in all
  2929. // HTTP headers.
  2930. data_len = 0;
  2931. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2932. if (headers_len <= 0) {
  2933. send_http_error(conn, 500, http_500_error,
  2934. "CGI program sent malformed or too big (>%u bytes) "
  2935. "HTTP headers: [%.*s]",
  2936. (unsigned) sizeof(buf), data_len, buf);
  2937. goto done;
  2938. }
  2939. pbuf = buf;
  2940. buf[headers_len - 1] = '\0';
  2941. parse_http_headers(&pbuf, &ri);
  2942. // Make up and send the status line
  2943. status_text = "OK";
  2944. if ((status = get_header(&ri, "Status")) != NULL) {
  2945. conn->status_code = atoi(status);
  2946. status_text = status;
  2947. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2948. status_text++;
  2949. }
  2950. } else if (get_header(&ri, "Location") != NULL) {
  2951. conn->status_code = 302;
  2952. } else {
  2953. conn->status_code = 200;
  2954. }
  2955. if (get_header(&ri, "Connection") != NULL &&
  2956. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2957. conn->must_close = 1;
  2958. }
  2959. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2960. status_text);
  2961. // Send headers
  2962. for (i = 0; i < ri.num_headers; i++) {
  2963. mg_printf(conn, "%s: %s\r\n",
  2964. ri.http_headers[i].name, ri.http_headers[i].value);
  2965. }
  2966. mg_write(conn, "\r\n", 2);
  2967. // Send chunk of data that may have been read after the headers
  2968. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2969. (size_t)(data_len - headers_len));
  2970. // Read the rest of CGI output and send to the client
  2971. send_file_data(conn, &fout, 0, INT64_MAX);
  2972. done:
  2973. if (pid != (pid_t) -1) {
  2974. kill(pid, SIGKILL);
  2975. }
  2976. if (fd_stdin[0] != -1) {
  2977. close(fd_stdin[0]);
  2978. }
  2979. if (fd_stdout[1] != -1) {
  2980. close(fd_stdout[1]);
  2981. }
  2982. if (in != NULL) {
  2983. fclose(in);
  2984. } else if (fd_stdin[1] != -1) {
  2985. close(fd_stdin[1]);
  2986. }
  2987. if (out != NULL) {
  2988. fclose(out);
  2989. } else if (fd_stdout[0] != -1) {
  2990. close(fd_stdout[0]);
  2991. }
  2992. }
  2993. #endif // !NO_CGI
  2994. // For a given PUT path, create all intermediate subdirectories
  2995. // for given path. Return 0 if the path itself is a directory,
  2996. // or -1 on error, 1 if OK.
  2997. static int put_dir(struct mg_connection *conn, const char *path) {
  2998. char buf[PATH_MAX];
  2999. const char *s, *p;
  3000. struct file file = STRUCT_FILE_INITIALIZER;
  3001. int len, res = 1;
  3002. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  3003. len = p - path;
  3004. if (len >= (int) sizeof(buf)) {
  3005. res = -1;
  3006. break;
  3007. }
  3008. memcpy(buf, path, len);
  3009. buf[len] = '\0';
  3010. // Try to create intermediate directory
  3011. DEBUG_TRACE(("mkdir(%s)", buf));
  3012. if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
  3013. res = -1;
  3014. break;
  3015. }
  3016. // Is path itself a directory?
  3017. if (p[1] == '\0') {
  3018. res = 0;
  3019. }
  3020. }
  3021. return res;
  3022. }
  3023. static void mkcol(struct mg_connection *conn, const char *path) {
  3024. int rc, body_len;
  3025. struct de de;
  3026. memset(&de.file, 0, sizeof(de.file));
  3027. mg_stat(conn, path, &de.file);
  3028. if(de.file.modification_time) {
  3029. send_http_error(conn, 405, "Method Not Allowed",
  3030. "mkcol(%s): %s", path, strerror(ERRNO));
  3031. return;
  3032. }
  3033. body_len = conn->data_len - conn->request_len;
  3034. if(body_len > 0) {
  3035. send_http_error(conn, 415, "Unsupported media type",
  3036. "mkcol(%s): %s", path, strerror(ERRNO));
  3037. return;
  3038. }
  3039. rc = mg_mkdir(path, 0755);
  3040. if (rc == 0) {
  3041. conn->status_code = 201;
  3042. mg_printf(conn, "HTTP/1.1 %d Created\r\n\r\n", conn->status_code);
  3043. } else if (rc == -1) {
  3044. if(errno == EEXIST)
  3045. send_http_error(conn, 405, "Method Not Allowed",
  3046. "mkcol(%s): %s", path, strerror(ERRNO));
  3047. else if(errno == EACCES)
  3048. send_http_error(conn, 403, "Forbidden",
  3049. "mkcol(%s): %s", path, strerror(ERRNO));
  3050. else if(errno == ENOENT)
  3051. send_http_error(conn, 409, "Conflict",
  3052. "mkcol(%s): %s", path, strerror(ERRNO));
  3053. else
  3054. send_http_error(conn, 500, http_500_error,
  3055. "fopen(%s): %s", path, strerror(ERRNO));
  3056. }
  3057. }
  3058. static void put_file(struct mg_connection *conn, const char *path) {
  3059. struct file file = STRUCT_FILE_INITIALIZER;
  3060. const char *range;
  3061. int64_t r1, r2;
  3062. int rc;
  3063. conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
  3064. if ((rc = put_dir(conn, path)) == 0) {
  3065. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  3066. } else if (rc == -1) {
  3067. send_http_error(conn, 500, http_500_error,
  3068. "put_dir(%s): %s", path, strerror(ERRNO));
  3069. } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
  3070. mg_fclose(&file);
  3071. send_http_error(conn, 500, http_500_error,
  3072. "fopen(%s): %s", path, strerror(ERRNO));
  3073. } else {
  3074. fclose_on_exec(&file);
  3075. range = mg_get_header(conn, "Content-Range");
  3076. r1 = r2 = 0;
  3077. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  3078. conn->status_code = 206;
  3079. fseeko(file.fp, r1, SEEK_SET);
  3080. }
  3081. if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
  3082. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  3083. }
  3084. mg_fclose(&file);
  3085. }
  3086. }
  3087. static void send_ssi_file(struct mg_connection *, const char *,
  3088. struct file *, int);
  3089. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  3090. char *tag, int include_level) {
  3091. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  3092. struct file file = STRUCT_FILE_INITIALIZER;
  3093. // sscanf() is safe here, since send_ssi_file() also uses buffer
  3094. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  3095. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  3096. // File name is relative to the webserver root
  3097. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  3098. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  3099. } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
  3100. // File name is relative to the webserver working directory
  3101. // or it is absolute system path
  3102. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  3103. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
  3104. sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  3105. // File name is relative to the currect document
  3106. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  3107. if ((p = strrchr(path, '/')) != NULL) {
  3108. p[1] = '\0';
  3109. }
  3110. (void) mg_snprintf(conn, path + strlen(path),
  3111. sizeof(path) - strlen(path), "%s", file_name);
  3112. } else {
  3113. cry(conn, "Bad SSI #include: [%s]", tag);
  3114. return;
  3115. }
  3116. if (!mg_fopen(conn, path, "rb", &file)) {
  3117. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  3118. tag, path, strerror(ERRNO));
  3119. } else {
  3120. fclose_on_exec(&file);
  3121. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3122. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  3123. send_ssi_file(conn, path, &file, include_level + 1);
  3124. } else {
  3125. send_file_data(conn, &file, 0, INT64_MAX);
  3126. }
  3127. mg_fclose(&file);
  3128. }
  3129. }
  3130. #if !defined(NO_POPEN)
  3131. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  3132. char cmd[MG_BUF_LEN];
  3133. struct file file = STRUCT_FILE_INITIALIZER;
  3134. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  3135. cry(conn, "Bad SSI #exec: [%s]", tag);
  3136. } else if ((file.fp = popen(cmd, "r")) == NULL) {
  3137. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  3138. } else {
  3139. send_file_data(conn, &file, 0, INT64_MAX);
  3140. pclose(file.fp);
  3141. }
  3142. }
  3143. #endif // !NO_POPEN
  3144. static int mg_fgetc(struct file *filep, int offset) {
  3145. if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
  3146. return ((unsigned char *) filep->membuf)[offset];
  3147. } else if (filep->fp != NULL) {
  3148. return fgetc(filep->fp);
  3149. } else {
  3150. return EOF;
  3151. }
  3152. }
  3153. static void send_ssi_file(struct mg_connection *conn, const char *path,
  3154. struct file *filep, int include_level) {
  3155. char buf[MG_BUF_LEN];
  3156. int ch, offset, len, in_ssi_tag;
  3157. if (include_level > 10) {
  3158. cry(conn, "SSI #include level is too deep (%s)", path);
  3159. return;
  3160. }
  3161. in_ssi_tag = len = offset = 0;
  3162. while ((ch = mg_fgetc(filep, offset)) != EOF) {
  3163. if (in_ssi_tag && ch == '>') {
  3164. in_ssi_tag = 0;
  3165. buf[len++] = (char) ch;
  3166. buf[len] = '\0';
  3167. assert(len <= (int) sizeof(buf));
  3168. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  3169. // Not an SSI tag, pass it
  3170. (void) mg_write(conn, buf, (size_t) len);
  3171. } else {
  3172. if (!memcmp(buf + 5, "include", 7)) {
  3173. do_ssi_include(conn, path, buf + 12, include_level);
  3174. #if !defined(NO_POPEN)
  3175. } else if (!memcmp(buf + 5, "exec", 4)) {
  3176. do_ssi_exec(conn, buf + 9);
  3177. #endif // !NO_POPEN
  3178. } else {
  3179. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  3180. }
  3181. }
  3182. len = 0;
  3183. } else if (in_ssi_tag) {
  3184. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  3185. // Not an SSI tag
  3186. in_ssi_tag = 0;
  3187. } else if (len == (int) sizeof(buf) - 2) {
  3188. cry(conn, "%s: SSI tag is too large", path);
  3189. len = 0;
  3190. }
  3191. buf[len++] = ch & 0xff;
  3192. } else if (ch == '<') {
  3193. in_ssi_tag = 1;
  3194. if (len > 0) {
  3195. mg_write(conn, buf, (size_t) len);
  3196. }
  3197. len = 0;
  3198. buf[len++] = ch & 0xff;
  3199. } else {
  3200. buf[len++] = ch & 0xff;
  3201. if (len == (int) sizeof(buf)) {
  3202. mg_write(conn, buf, (size_t) len);
  3203. len = 0;
  3204. }
  3205. }
  3206. }
  3207. // Send the rest of buffered data
  3208. if (len > 0) {
  3209. mg_write(conn, buf, (size_t) len);
  3210. }
  3211. }
  3212. static void handle_ssi_file_request(struct mg_connection *conn,
  3213. const char *path) {
  3214. struct file file = STRUCT_FILE_INITIALIZER;
  3215. if (!mg_fopen(conn, path, "rb", &file)) {
  3216. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  3217. strerror(ERRNO));
  3218. } else {
  3219. conn->must_close = 1;
  3220. fclose_on_exec(&file);
  3221. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  3222. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  3223. suggest_connection_header(conn));
  3224. send_ssi_file(conn, path, &file, 0);
  3225. mg_fclose(&file);
  3226. }
  3227. }
  3228. static void send_options(struct mg_connection *conn) {
  3229. conn->status_code = 200;
  3230. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3231. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS, PROPFIND, MKCOL\r\n"
  3232. "DAV: 1\r\n\r\n");
  3233. }
  3234. // Writes PROPFIND properties for a collection element
  3235. static void print_props(struct mg_connection *conn, const char* uri,
  3236. struct file *filep) {
  3237. char mtime[64];
  3238. gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
  3239. conn->num_bytes_sent += mg_printf(conn,
  3240. "<d:response>"
  3241. "<d:href>%s</d:href>"
  3242. "<d:propstat>"
  3243. "<d:prop>"
  3244. "<d:resourcetype>%s</d:resourcetype>"
  3245. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3246. "<d:getlastmodified>%s</d:getlastmodified>"
  3247. "</d:prop>"
  3248. "<d:status>HTTP/1.1 200 OK</d:status>"
  3249. "</d:propstat>"
  3250. "</d:response>\n",
  3251. uri,
  3252. filep->is_directory ? "<d:collection/>" : "",
  3253. filep->size,
  3254. mtime);
  3255. }
  3256. static void print_dav_dir_entry(struct de *de, void *data) {
  3257. char href[PATH_MAX];
  3258. char href_encoded[PATH_MAX];
  3259. struct mg_connection *conn = (struct mg_connection *) data;
  3260. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3261. conn->request_info.uri, de->file_name);
  3262. mg_url_encode(href, href_encoded, PATH_MAX-1);
  3263. print_props(conn, href_encoded, &de->file);
  3264. }
  3265. static void handle_propfind(struct mg_connection *conn, const char *path,
  3266. struct file *filep) {
  3267. const char *depth = mg_get_header(conn, "Depth");
  3268. conn->must_close = 1;
  3269. conn->status_code = 207;
  3270. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3271. "Connection: close\r\n"
  3272. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3273. conn->num_bytes_sent += mg_printf(conn,
  3274. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3275. "<d:multistatus xmlns:d='DAV:'>\n");
  3276. // Print properties for the requested resource itself
  3277. print_props(conn, conn->request_info.uri, filep);
  3278. // If it is a directory, print directory entries too if Depth is not 0
  3279. if (filep->is_directory &&
  3280. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3281. (depth == NULL || strcmp(depth, "0") != 0)) {
  3282. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3283. }
  3284. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3285. }
  3286. #if defined(USE_WEBSOCKET)
  3287. // START OF SHA-1 code
  3288. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3289. #define SHA1HANDSOFF
  3290. #if defined(__sun)
  3291. #include "solarisfixes.h"
  3292. #endif
  3293. union char64long16 { unsigned char c[64]; uint32_t l[16]; };
  3294. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3295. static uint32_t blk0(union char64long16 *block, int i) {
  3296. // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
  3297. if (!is_big_endian()) {
  3298. block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
  3299. (rol(block->l[i], 8) & 0x00FF00FF);
  3300. }
  3301. return block->l[i];
  3302. }
  3303. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3304. ^block->l[(i+2)&15]^block->l[i&15],1))
  3305. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
  3306. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3307. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3308. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3309. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3310. typedef struct {
  3311. uint32_t state[5];
  3312. uint32_t count[2];
  3313. unsigned char buffer[64];
  3314. } SHA1_CTX;
  3315. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3316. uint32_t a, b, c, d, e;
  3317. union char64long16 block[1];
  3318. memcpy(block, buffer, 64);
  3319. a = state[0];
  3320. b = state[1];
  3321. c = state[2];
  3322. d = state[3];
  3323. e = state[4];
  3324. 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);
  3325. 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);
  3326. 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);
  3327. 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);
  3328. 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);
  3329. 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);
  3330. 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);
  3331. 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);
  3332. 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);
  3333. 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);
  3334. 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);
  3335. 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);
  3336. 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);
  3337. 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);
  3338. 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);
  3339. 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);
  3340. 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);
  3341. 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);
  3342. 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);
  3343. 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);
  3344. state[0] += a;
  3345. state[1] += b;
  3346. state[2] += c;
  3347. state[3] += d;
  3348. state[4] += e;
  3349. a = b = c = d = e = 0;
  3350. memset(block, '\0', sizeof(block));
  3351. }
  3352. static void SHA1Init(SHA1_CTX* context) {
  3353. context->state[0] = 0x67452301;
  3354. context->state[1] = 0xEFCDAB89;
  3355. context->state[2] = 0x98BADCFE;
  3356. context->state[3] = 0x10325476;
  3357. context->state[4] = 0xC3D2E1F0;
  3358. context->count[0] = context->count[1] = 0;
  3359. }
  3360. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3361. uint32_t len) {
  3362. uint32_t i, j;
  3363. j = context->count[0];
  3364. if ((context->count[0] += len << 3) < j)
  3365. context->count[1]++;
  3366. context->count[1] += (len>>29);
  3367. j = (j >> 3) & 63;
  3368. if ((j + len) > 63) {
  3369. memcpy(&context->buffer[j], data, (i = 64-j));
  3370. SHA1Transform(context->state, context->buffer);
  3371. for ( ; i + 63 < len; i += 64) {
  3372. SHA1Transform(context->state, &data[i]);
  3373. }
  3374. j = 0;
  3375. }
  3376. else i = 0;
  3377. memcpy(&context->buffer[j], &data[i], len - i);
  3378. }
  3379. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3380. unsigned i;
  3381. unsigned char finalcount[8], c;
  3382. for (i = 0; i < 8; i++) {
  3383. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3384. >> ((3-(i & 3)) * 8) ) & 255);
  3385. }
  3386. c = 0200;
  3387. SHA1Update(context, &c, 1);
  3388. while ((context->count[0] & 504) != 448) {
  3389. c = 0000;
  3390. SHA1Update(context, &c, 1);
  3391. }
  3392. SHA1Update(context, finalcount, 8);
  3393. for (i = 0; i < 20; i++) {
  3394. digest[i] = (unsigned char)
  3395. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3396. }
  3397. memset(context, '\0', sizeof(*context));
  3398. memset(&finalcount, '\0', sizeof(finalcount));
  3399. }
  3400. // END OF SHA1 CODE
  3401. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3402. static const char *b64 =
  3403. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3404. int i, j, a, b, c;
  3405. for (i = j = 0; i < src_len; i += 3) {
  3406. a = src[i];
  3407. b = i + 1 >= src_len ? 0 : src[i + 1];
  3408. c = i + 2 >= src_len ? 0 : src[i + 2];
  3409. dst[j++] = b64[a >> 2];
  3410. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3411. if (i + 1 < src_len) {
  3412. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3413. }
  3414. if (i + 2 < src_len) {
  3415. dst[j++] = b64[c & 63];
  3416. }
  3417. }
  3418. while (j % 4 != 0) {
  3419. dst[j++] = '=';
  3420. }
  3421. dst[j++] = '\0';
  3422. }
  3423. static void send_websocket_handshake(struct mg_connection *conn) {
  3424. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3425. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3426. SHA1_CTX sha_ctx;
  3427. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3428. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3429. SHA1Init(&sha_ctx);
  3430. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3431. SHA1Final((unsigned char *) sha, &sha_ctx);
  3432. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3433. mg_printf(conn, "%s%s%s",
  3434. "HTTP/1.1 101 Switching Protocols\r\n"
  3435. "Upgrade: websocket\r\n"
  3436. "Connection: Upgrade\r\n"
  3437. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3438. }
  3439. static void read_websocket(struct mg_connection *conn) {
  3440. // Pointer to the beginning of the portion of the incoming websocket message
  3441. // queue. The original websocket upgrade request is never removed,
  3442. // so the queue begins after it.
  3443. unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
  3444. int bits, n, stop = 0;
  3445. size_t i, len, mask_len, data_len, header_len, body_len;
  3446. // data points to the place where the message is stored when passed to the
  3447. // websocket_data callback. This is either mem on the stack,
  3448. // or a dynamically allocated buffer if it is too large.
  3449. char mem[4 * 1024], mask[4], *data;
  3450. assert(conn->content_len == 0);
  3451. // Loop continuously, reading messages from the socket, invoking the callback,
  3452. // and waiting repeatedly until an error occurs.
  3453. while (!stop) {
  3454. header_len = 0;
  3455. // body_len is the length of the entire queue in bytes
  3456. // len is the length of the current message
  3457. // data_len is the length of the current message's data payload
  3458. // header_len is the length of the current message's header
  3459. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3460. len = buf[1] & 127;
  3461. mask_len = buf[1] & 128 ? 4 : 0;
  3462. if (len < 126 && body_len >= mask_len) {
  3463. data_len = len;
  3464. header_len = 2 + mask_len;
  3465. } else if (len == 126 && body_len >= 4 + mask_len) {
  3466. header_len = 4 + mask_len;
  3467. data_len = ((((int) buf[2]) << 8) + buf[3]);
  3468. } else if (body_len >= 10 + mask_len) {
  3469. header_len = 10 + mask_len;
  3470. data_len = (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
  3471. htonl(* (uint32_t *) &buf[6]);
  3472. }
  3473. }
  3474. // Data layout is as follows:
  3475. // conn->buf buf
  3476. // v v frame1 | frame2
  3477. // |---------------------|----------------|--------------|-------
  3478. // | |<--header_len-->|<--data_len-->|
  3479. // |<-conn->request_len->|<-----body_len----------->|
  3480. // |<-------------------conn->data_len------------->|
  3481. if (header_len > 0) {
  3482. // Allocate space to hold websocket payload
  3483. data = mem;
  3484. if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
  3485. // Allocation failed, exit the loop and then close the connection
  3486. // TODO: notify user about the failure
  3487. break;
  3488. }
  3489. // Save mask and bits, otherwise it may be clobbered by memmove below
  3490. bits = buf[0];
  3491. memcpy(mask, buf + header_len - mask_len, mask_len);
  3492. // Read frame payload into the allocated buffer.
  3493. assert(body_len >= header_len);
  3494. if (data_len + header_len > body_len) {
  3495. len = body_len - header_len;
  3496. memcpy(data, buf + header_len, len);
  3497. // TODO: handle pull error
  3498. pull_all(NULL, conn, data + len, data_len - len);
  3499. conn->data_len = conn->request_len;
  3500. } else {
  3501. len = data_len + header_len;
  3502. memcpy(data, buf + header_len, data_len);
  3503. memmove(buf, buf + len, body_len - len);
  3504. conn->data_len -= len;
  3505. }
  3506. // Apply mask if necessary
  3507. if (mask_len > 0) {
  3508. for (i = 0; i < data_len; i++) {
  3509. data[i] ^= mask[i % 4];
  3510. }
  3511. }
  3512. // Exit the loop if callback signalled to exit,
  3513. // or "connection close" opcode received.
  3514. if ((conn->ctx->callbacks.websocket_data != NULL &&
  3515. !conn->ctx->callbacks.websocket_data(conn, bits, data, data_len)) ||
  3516. (bits & 0xf) == 8) { // Opcode == 8, connection close
  3517. stop = 1;
  3518. }
  3519. if (data != mem) {
  3520. free(data);
  3521. }
  3522. // Not breaking the loop, process next websocket frame.
  3523. } else {
  3524. // Buffering websocket request
  3525. if ((n = pull(NULL, conn, conn->buf + conn->data_len,
  3526. conn->buf_size - conn->data_len)) <= 0) {
  3527. break;
  3528. }
  3529. conn->data_len += n;
  3530. }
  3531. }
  3532. }
  3533. int mg_websocket_write(struct mg_connection* conn, int opcode,
  3534. const char *data, size_t data_len) {
  3535. unsigned char *copy;
  3536. size_t copy_len = 0;
  3537. int retval = -1;
  3538. if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
  3539. return -1;
  3540. }
  3541. copy[0] = 0x80 + (opcode & 0x0f);
  3542. // Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
  3543. if (data_len < 126) {
  3544. // Inline 7-bit length field
  3545. copy[1] = data_len;
  3546. memcpy(copy + 2, data, data_len);
  3547. copy_len = 2 + data_len;
  3548. } else if (data_len <= 0xFFFF) {
  3549. // 16-bit length field
  3550. copy[1] = 126;
  3551. * (uint16_t *) (copy + 2) = htons(data_len);
  3552. memcpy(copy + 4, data, data_len);
  3553. copy_len = 4 + data_len;
  3554. } else {
  3555. // 64-bit length field
  3556. copy[1] = 127;
  3557. * (uint32_t *) (copy + 2) = htonl((uint64_t) data_len >> 32);
  3558. * (uint32_t *) (copy + 6) = htonl(data_len & 0xffffffff);
  3559. memcpy(copy + 10, data, data_len);
  3560. copy_len = 10 + data_len;
  3561. }
  3562. // Not thread safe
  3563. if (copy_len > 0) {
  3564. retval = mg_write(conn, copy, copy_len);
  3565. }
  3566. free(copy);
  3567. return retval;
  3568. }
  3569. static void handle_websocket_request(struct mg_connection *conn) {
  3570. const char *version = mg_get_header(conn, "Sec-WebSocket-Version");
  3571. if (version == NULL || strcmp(version, "13") != 0) {
  3572. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3573. } else if (conn->ctx->callbacks.websocket_connect != NULL &&
  3574. conn->ctx->callbacks.websocket_connect(conn) != 0) {
  3575. // Callback has returned non-zero, do not proceed with handshake
  3576. } else {
  3577. send_websocket_handshake(conn);
  3578. if (conn->ctx->callbacks.websocket_ready != NULL) {
  3579. conn->ctx->callbacks.websocket_ready(conn);
  3580. }
  3581. read_websocket(conn);
  3582. }
  3583. }
  3584. static int is_websocket_request(const struct mg_connection *conn) {
  3585. const char *host, *upgrade, *connection, *version, *key;
  3586. host = mg_get_header(conn, "Host");
  3587. upgrade = mg_get_header(conn, "Upgrade");
  3588. connection = mg_get_header(conn, "Connection");
  3589. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3590. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3591. return host != NULL && upgrade != NULL && connection != NULL &&
  3592. key != NULL && version != NULL &&
  3593. mg_strcasestr(upgrade, "websocket") != NULL &&
  3594. mg_strcasestr(connection, "Upgrade") != NULL;
  3595. }
  3596. #endif // !USE_WEBSOCKET
  3597. static int isbyte(int n) {
  3598. return n >= 0 && n <= 255;
  3599. }
  3600. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3601. int n, a, b, c, d, slash = 32, len = 0;
  3602. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3603. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3604. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3605. slash >= 0 && slash < 33) {
  3606. len = n;
  3607. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3608. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3609. }
  3610. return len;
  3611. }
  3612. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3613. int throttle = 0;
  3614. struct vec vec, val;
  3615. uint32_t net, mask;
  3616. char mult;
  3617. double v;
  3618. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3619. mult = ',';
  3620. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3621. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3622. continue;
  3623. }
  3624. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3625. if (vec.len == 1 && vec.ptr[0] == '*') {
  3626. throttle = (int) v;
  3627. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3628. if ((remote_ip & mask) == net) {
  3629. throttle = (int) v;
  3630. }
  3631. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3632. throttle = (int) v;
  3633. }
  3634. }
  3635. return throttle;
  3636. }
  3637. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3638. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3639. }
  3640. #ifdef USE_LUA
  3641. #include "mod_lua.c"
  3642. #endif // USE_LUA
  3643. int mg_upload(struct mg_connection *conn, const char *destination_dir) {
  3644. const char *content_type_header, *boundary_start;
  3645. char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
  3646. FILE *fp;
  3647. int bl, n, i, j, headers_len, boundary_len, eof,
  3648. len = 0, num_uploaded_files = 0;
  3649. // Request looks like this:
  3650. //
  3651. // POST /upload HTTP/1.1
  3652. // Host: 127.0.0.1:8080
  3653. // Content-Length: 244894
  3654. // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
  3655. //
  3656. // ------WebKitFormBoundaryRVr
  3657. // Content-Disposition: form-data; name="file"; filename="accum.png"
  3658. // Content-Type: image/png
  3659. //
  3660. // <89>PNG
  3661. // <PNG DATA>
  3662. // ------WebKitFormBoundaryRVr
  3663. // Extract boundary string from the Content-Type header
  3664. if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
  3665. (boundary_start = mg_strcasestr(content_type_header,
  3666. "boundary=")) == NULL ||
  3667. (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
  3668. sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
  3669. boundary[0] == '\0') {
  3670. return num_uploaded_files;
  3671. }
  3672. boundary_len = strlen(boundary);
  3673. bl = boundary_len + 4; // \r\n--<boundary>
  3674. for (;;) {
  3675. // Pull in headers
  3676. assert(len >= 0 && len <= (int) sizeof(buf));
  3677. while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
  3678. len += n;
  3679. }
  3680. if ((headers_len = get_request_len(buf, len)) <= 0) {
  3681. break;
  3682. }
  3683. // Fetch file name.
  3684. fname[0] = '\0';
  3685. for (i = j = 0; i < headers_len; i++) {
  3686. if (buf[i] == '\r' && buf[i + 1] == '\n') {
  3687. buf[i] = buf[i + 1] = '\0';
  3688. // TODO(lsm): don't expect filename to be the 3rd field,
  3689. // parse the header properly instead.
  3690. sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
  3691. fname);
  3692. j = i + 2;
  3693. }
  3694. }
  3695. // Give up if the headers are not what we expect
  3696. if (fname[0] == '\0') {
  3697. break;
  3698. }
  3699. // Move data to the beginning of the buffer
  3700. assert(len >= headers_len);
  3701. memmove(buf, &buf[headers_len], len - headers_len);
  3702. len -= headers_len;
  3703. // We open the file with exclusive lock held. This guarantee us
  3704. // there is no other thread can save into the same file simultaneously.
  3705. fp = NULL;
  3706. // Construct destination file name. Do not allow paths to have slashes.
  3707. if ((s = strrchr(fname, '/')) == NULL &&
  3708. (s = strrchr(fname, '\\')) == NULL) {
  3709. s = fname;
  3710. }
  3711. // Open file in binary mode. TODO: set an exclusive lock.
  3712. snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
  3713. if ((fp = fopen(path, "wb")) == NULL) {
  3714. break;
  3715. }
  3716. // Read POST data, write into file until boundary is found.
  3717. eof = n = 0;
  3718. do {
  3719. len += n;
  3720. for (i = 0; i < len - bl; i++) {
  3721. if (!memcmp(&buf[i], "\r\n--", 4) &&
  3722. !memcmp(&buf[i + 4], boundary, boundary_len)) {
  3723. // Found boundary, that's the end of file data.
  3724. fwrite(buf, 1, i, fp);
  3725. eof = 1;
  3726. memmove(buf, &buf[i + bl], len - (i + bl));
  3727. len -= i + bl;
  3728. break;
  3729. }
  3730. }
  3731. if (!eof && len > bl) {
  3732. fwrite(buf, 1, len - bl, fp);
  3733. memmove(buf, &buf[len - bl], bl);
  3734. len = bl;
  3735. }
  3736. } while (!eof && (n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
  3737. fclose(fp);
  3738. if (eof) {
  3739. num_uploaded_files++;
  3740. if (conn->ctx->callbacks.upload != NULL) {
  3741. conn->ctx->callbacks.upload(conn, path);
  3742. }
  3743. }
  3744. }
  3745. return num_uploaded_files;
  3746. }
  3747. static int is_put_or_delete_request(const struct mg_connection *conn) {
  3748. const char *s = conn->request_info.request_method;
  3749. return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE") || !strcmp(s, "MKCOL"));
  3750. }
  3751. static int get_first_ssl_listener_index(const struct mg_context *ctx) {
  3752. int i, index = -1;
  3753. for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
  3754. index = ctx->listening_sockets[i].is_ssl ? i : -1;
  3755. }
  3756. return index;
  3757. }
  3758. static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
  3759. char host[1025];
  3760. const char *host_header;
  3761. if ((host_header = mg_get_header(conn, "Host")) == NULL ||
  3762. sscanf(host_header, "%1024[^:]", host) == 0) {
  3763. // Cannot get host from the Host: header. Fallback to our IP address.
  3764. sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
  3765. }
  3766. mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
  3767. host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
  3768. lsa.sin.sin_port), conn->request_info.uri);
  3769. }
  3770. // This is the heart of the Mongoose's logic.
  3771. // This function is called when the request is read, parsed and validated,
  3772. // and Mongoose must decide what action to take: serve a file, or
  3773. // a directory, or call embedded function, etcetera.
  3774. static void handle_request(struct mg_connection *conn) {
  3775. struct mg_request_info *ri = &conn->request_info;
  3776. char path[PATH_MAX];
  3777. int uri_len, ssl_index;
  3778. struct file file = STRUCT_FILE_INITIALIZER;
  3779. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3780. * ((char *) conn->request_info.query_string++) = '\0';
  3781. }
  3782. uri_len = (int) strlen(ri->uri);
  3783. mg_url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
  3784. remove_double_dots_and_double_slashes((char *) ri->uri);
  3785. convert_uri_to_file_name(conn, path, sizeof(path), &file);
  3786. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3787. get_remote_ip(conn), ri->uri);
  3788. DEBUG_TRACE(("%s", ri->uri));
  3789. // Perform redirect and auth checks before calling begin_request() handler.
  3790. // Otherwise, begin_request() would need to perform auth checks and redirects.
  3791. if (!conn->client.is_ssl && conn->client.ssl_redir &&
  3792. (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
  3793. redirect_to_https_port(conn, ssl_index);
  3794. } else if (!is_put_or_delete_request(conn) &&
  3795. !check_authorization(conn, path)) {
  3796. send_authorization_request(conn);
  3797. } else if (conn->ctx->callbacks.begin_request != NULL &&
  3798. conn->ctx->callbacks.begin_request(conn)) {
  3799. // Do nothing, callback has served the request
  3800. #if defined(USE_WEBSOCKET)
  3801. } else if (is_websocket_request(conn)) {
  3802. handle_websocket_request(conn);
  3803. #endif
  3804. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3805. send_options(conn);
  3806. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3807. send_http_error(conn, 404, "Not Found", "Not Found");
  3808. } else if (is_put_or_delete_request(conn) &&
  3809. (is_authorized_for_put(conn) != 1)) {
  3810. send_authorization_request(conn);
  3811. } else if (!strcmp(ri->request_method, "PUT")) {
  3812. put_file(conn, path);
  3813. } else if (!strcmp(ri->request_method, "MKCOL")) {
  3814. mkcol(conn, path);
  3815. } else if (!strcmp(ri->request_method, "DELETE")) {
  3816. struct de de;
  3817. memset(&de.file, 0, sizeof(de.file));
  3818. if(!mg_stat(conn, path, &de.file)) {
  3819. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3820. } else {
  3821. if(de.file.modification_time) {
  3822. if(de.file.is_directory) {
  3823. remove_directory(conn, path);
  3824. send_http_error(conn, 204, "No Content", "%s", "");
  3825. } else if (mg_remove(path) == 0) {
  3826. send_http_error(conn, 204, "No Content", "%s", "");
  3827. } else {
  3828. send_http_error(conn, 423, "Locked", "remove(%s): %s", path,
  3829. strerror(ERRNO));
  3830. }
  3831. }
  3832. else {
  3833. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3834. strerror(ERRNO));
  3835. }
  3836. }
  3837. } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
  3838. must_hide_file(conn, path)) {
  3839. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3840. } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
  3841. mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3842. "Location: %s/\r\n\r\n", ri->uri);
  3843. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3844. handle_propfind(conn, path, &file);
  3845. } else if (file.is_directory &&
  3846. !substitute_index_file(conn, path, sizeof(path), &file)) {
  3847. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3848. handle_directory_request(conn, path);
  3849. } else {
  3850. send_http_error(conn, 403, "Directory Listing Denied",
  3851. "Directory listing denied");
  3852. }
  3853. #ifdef USE_LUA
  3854. } else if (match_prefix("**.lp$", 6, path) > 0) {
  3855. handle_lsp_request(conn, path, &file, NULL);
  3856. #endif
  3857. #if !defined(NO_CGI)
  3858. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3859. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3860. path) > 0) {
  3861. if (strcmp(ri->request_method, "POST") &&
  3862. strcmp(ri->request_method, "HEAD") &&
  3863. strcmp(ri->request_method, "GET")) {
  3864. send_http_error(conn, 501, "Not Implemented",
  3865. "Method %s is not implemented", ri->request_method);
  3866. } else {
  3867. handle_cgi_request(conn, path);
  3868. }
  3869. #endif // !NO_CGI
  3870. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3871. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3872. path) > 0) {
  3873. handle_ssi_file_request(conn, path);
  3874. } else if (is_not_modified(conn, &file)) {
  3875. send_http_error(conn, 304, "Not Modified", "%s", "");
  3876. } else {
  3877. handle_file_request(conn, path, &file);
  3878. }
  3879. }
  3880. static void close_all_listening_sockets(struct mg_context *ctx) {
  3881. int i;
  3882. for (i = 0; i < ctx->num_listening_sockets; i++) {
  3883. closesocket(ctx->listening_sockets[i].sock);
  3884. }
  3885. free(ctx->listening_sockets);
  3886. }
  3887. // Valid listening port specification is: [ip_address:]port[s]
  3888. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3889. // TODO(lsm): add parsing of the IPv6 address
  3890. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3891. int a, b, c, d, port, len;
  3892. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3893. // Also, all-zeroes in the socket address means binding to all addresses
  3894. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3895. memset(so, 0, sizeof(*so));
  3896. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  3897. // Bind to a specific IPv4 address
  3898. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3899. } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
  3900. len <= 0 ||
  3901. len > (int) vec->len ||
  3902. port < 1 ||
  3903. port > 65535 ||
  3904. (vec->ptr[len] && vec->ptr[len] != 's' &&
  3905. vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {
  3906. return 0;
  3907. }
  3908. so->is_ssl = vec->ptr[len] == 's';
  3909. so->ssl_redir = vec->ptr[len] == 'r';
  3910. #if defined(USE_IPV6)
  3911. so->lsa.sin6.sin6_family = AF_INET6;
  3912. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3913. #else
  3914. so->lsa.sin.sin_family = AF_INET;
  3915. so->lsa.sin.sin_port = htons((uint16_t) port);
  3916. #endif
  3917. return 1;
  3918. }
  3919. static int set_ports_option(struct mg_context *ctx) {
  3920. const char *list = ctx->config[LISTENING_PORTS];
  3921. int on = 1, success = 1;
  3922. #if defined(USE_IPV6)
  3923. int off = 0;
  3924. #endif
  3925. struct vec vec;
  3926. struct socket so, *ptr;
  3927. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3928. if (!parse_port_string(&vec, &so)) {
  3929. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3930. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  3931. success = 0;
  3932. } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
  3933. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3934. success = 0;
  3935. } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3936. INVALID_SOCKET ||
  3937. // On Windows, SO_REUSEADDR is recommended only for
  3938. // broadcast UDP sockets
  3939. setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
  3940. (void *) &on, sizeof(on)) != 0 ||
  3941. #if defined(USE_IPV6)
  3942. setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
  3943. sizeof(off)) != 0 ||
  3944. #endif
  3945. bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
  3946. listen(so.sock, SOMAXCONN) != 0) {
  3947. cry(fc(ctx), "%s: cannot bind to %.*s: %d", __func__,
  3948. (int) vec.len, vec.ptr, ERRNO);
  3949. closesocket(so.sock);
  3950. success = 0;
  3951. } else if ((ptr = realloc(ctx->listening_sockets,
  3952. (ctx->num_listening_sockets + 1) *
  3953. sizeof(ctx->listening_sockets[0]))) == NULL) {
  3954. closesocket(so.sock);
  3955. success = 0;
  3956. } else {
  3957. set_close_on_exec(so.sock);
  3958. ctx->listening_sockets = ptr;
  3959. ctx->listening_sockets[ctx->num_listening_sockets] = so;
  3960. ctx->num_listening_sockets++;
  3961. }
  3962. }
  3963. if (!success) {
  3964. close_all_listening_sockets(ctx);
  3965. }
  3966. return success;
  3967. }
  3968. static void log_header(const struct mg_connection *conn, const char *header,
  3969. FILE *fp) {
  3970. const char *header_value;
  3971. if ((header_value = mg_get_header(conn, header)) == NULL) {
  3972. (void) fprintf(fp, "%s", " -");
  3973. } else {
  3974. (void) fprintf(fp, " \"%s\"", header_value);
  3975. }
  3976. }
  3977. static void log_access(const struct mg_connection *conn) {
  3978. const struct mg_request_info *ri;
  3979. FILE *fp;
  3980. char date[64], src_addr[IP_ADDR_STR_LEN];
  3981. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  3982. fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  3983. if (fp == NULL)
  3984. return;
  3985. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3986. localtime(&conn->birth_time));
  3987. ri = &conn->request_info;
  3988. flockfile(fp);
  3989. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  3990. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3991. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  3992. ri->request_method ? ri->request_method : "-",
  3993. ri->uri ? ri->uri : "-", ri->http_version,
  3994. conn->status_code, conn->num_bytes_sent);
  3995. log_header(conn, "Referer", fp);
  3996. log_header(conn, "User-Agent", fp);
  3997. fputc('\n', fp);
  3998. fflush(fp);
  3999. funlockfile(fp);
  4000. fclose(fp);
  4001. }
  4002. // Verify given socket address against the ACL.
  4003. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  4004. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  4005. int allowed, flag;
  4006. uint32_t net, mask;
  4007. struct vec vec;
  4008. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  4009. // If any ACL is set, deny by default
  4010. allowed = list == NULL ? '+' : '-';
  4011. while ((list = next_option(list, &vec, NULL)) != NULL) {
  4012. flag = vec.ptr[0];
  4013. if ((flag != '+' && flag != '-') ||
  4014. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  4015. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  4016. return -1;
  4017. }
  4018. if (net == (remote_ip & mask)) {
  4019. allowed = flag;
  4020. }
  4021. }
  4022. return allowed == '+';
  4023. }
  4024. #if !defined(_WIN32)
  4025. static int set_uid_option(struct mg_context *ctx) {
  4026. struct passwd *pw;
  4027. const char *uid = ctx->config[RUN_AS_USER];
  4028. int success = 0;
  4029. if (uid == NULL) {
  4030. success = 1;
  4031. } else {
  4032. if ((pw = getpwnam(uid)) == NULL) {
  4033. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  4034. } else if (setgid(pw->pw_gid) == -1) {
  4035. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  4036. } else if (setuid(pw->pw_uid) == -1) {
  4037. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  4038. } else {
  4039. success = 1;
  4040. }
  4041. }
  4042. return success;
  4043. }
  4044. #endif // !_WIN32
  4045. #if !defined(NO_SSL)
  4046. static pthread_mutex_t *ssl_mutexes;
  4047. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  4048. return (conn->ssl = SSL_new(s)) != NULL &&
  4049. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  4050. func(conn->ssl) == 1;
  4051. }
  4052. // Return OpenSSL error message
  4053. static const char *ssl_error(void) {
  4054. unsigned long err;
  4055. err = ERR_get_error();
  4056. return err == 0 ? "" : ERR_error_string(err, NULL);
  4057. }
  4058. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  4059. int line) {
  4060. (void) line;
  4061. (void) file;
  4062. if (mode & 1) { // 1 is CRYPTO_LOCK
  4063. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  4064. } else {
  4065. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  4066. }
  4067. }
  4068. static unsigned long ssl_id_callback(void) {
  4069. return (unsigned long) pthread_self();
  4070. }
  4071. #if !defined(NO_SSL_DL)
  4072. static int load_dll(struct mg_context *ctx, const char *dll_name,
  4073. struct ssl_func *sw) {
  4074. union {void *p; void (*fp)(void);} u;
  4075. void *dll_handle;
  4076. struct ssl_func *fp;
  4077. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  4078. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  4079. return 0;
  4080. }
  4081. for (fp = sw; fp->name != NULL; fp++) {
  4082. #ifdef _WIN32
  4083. // GetProcAddress() returns pointer to function
  4084. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  4085. #else
  4086. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  4087. // function pointers. We need to use a union to make a cast.
  4088. u.p = dlsym(dll_handle, fp->name);
  4089. #endif // _WIN32
  4090. if (u.fp == NULL) {
  4091. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  4092. return 0;
  4093. } else {
  4094. fp->ptr = u.fp;
  4095. }
  4096. }
  4097. return 1;
  4098. }
  4099. #endif // NO_SSL_DL
  4100. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  4101. static int set_ssl_option(struct mg_context *ctx) {
  4102. int i, size;
  4103. const char *pem;
  4104. // If PEM file is not specified and the init_ssl callback
  4105. // is not specified, skip SSL initialization.
  4106. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL &&
  4107. ctx->callbacks.init_ssl == NULL) {
  4108. return 1;
  4109. }
  4110. #if !defined(NO_SSL_DL)
  4111. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  4112. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  4113. return 0;
  4114. }
  4115. #endif // NO_SSL_DL
  4116. // Initialize SSL library
  4117. SSL_library_init();
  4118. SSL_load_error_strings();
  4119. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  4120. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  4121. return 0;
  4122. }
  4123. // If user callback returned non-NULL, that means that user callback has
  4124. // set up certificate itself. In this case, skip sertificate setting.
  4125. if ((ctx->callbacks.init_ssl == NULL ||
  4126. !ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
  4127. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
  4128. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
  4129. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  4130. return 0;
  4131. }
  4132. if (pem != NULL) {
  4133. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  4134. }
  4135. // Initialize locking callbacks, needed for thread safety.
  4136. // http://www.openssl.org/support/faq.html#PROG1
  4137. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  4138. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  4139. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  4140. return 0;
  4141. }
  4142. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4143. pthread_mutex_init(&ssl_mutexes[i], NULL);
  4144. }
  4145. CRYPTO_set_locking_callback(&ssl_locking_callback);
  4146. CRYPTO_set_id_callback(&ssl_id_callback);
  4147. return 1;
  4148. }
  4149. static void uninitialize_ssl(struct mg_context *ctx) {
  4150. int i;
  4151. if (ctx->ssl_ctx != NULL) {
  4152. CRYPTO_set_locking_callback(NULL);
  4153. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4154. pthread_mutex_destroy(&ssl_mutexes[i]);
  4155. }
  4156. CRYPTO_set_locking_callback(NULL);
  4157. CRYPTO_set_id_callback(NULL);
  4158. }
  4159. }
  4160. #endif // !NO_SSL
  4161. static int set_gpass_option(struct mg_context *ctx) {
  4162. struct file file = STRUCT_FILE_INITIALIZER;
  4163. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  4164. if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
  4165. cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
  4166. return 0;
  4167. }
  4168. return 1;
  4169. }
  4170. static int set_acl_option(struct mg_context *ctx) {
  4171. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  4172. }
  4173. static void reset_per_request_attributes(struct mg_connection *conn) {
  4174. conn->path_info = NULL;
  4175. conn->num_bytes_sent = conn->consumed_content = 0;
  4176. conn->status_code = -1;
  4177. conn->must_close = conn->request_len = conn->throttle = 0;
  4178. }
  4179. static void close_socket_gracefully(struct mg_connection *conn) {
  4180. #if defined(_WIN32)
  4181. char buf[MG_BUF_LEN];
  4182. int n;
  4183. #endif
  4184. struct linger linger;
  4185. // Set linger option to avoid socket hanging out after close. This prevent
  4186. // ephemeral port exhaust problem under high QPS.
  4187. linger.l_onoff = 1;
  4188. linger.l_linger = 1;
  4189. setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
  4190. (char *) &linger, sizeof(linger));
  4191. // Send FIN to the client
  4192. shutdown(conn->client.sock, SHUT_WR);
  4193. set_non_blocking_mode(conn->client.sock);
  4194. #if defined(_WIN32)
  4195. // Read and discard pending incoming data. If we do not do that and close the
  4196. // socket, the data in the send buffer may be discarded. This
  4197. // behaviour is seen on Windows, when client keeps sending data
  4198. // when server decides to close the connection; then when client
  4199. // does recv() it gets no data back.
  4200. do {
  4201. n = pull(NULL, conn, buf, sizeof(buf));
  4202. } while (n > 0);
  4203. #endif
  4204. // Now we know that our FIN is ACK-ed, safe to close
  4205. closesocket(conn->client.sock);
  4206. }
  4207. static void close_connection(struct mg_connection *conn) {
  4208. conn->must_close = 1;
  4209. #ifndef NO_SSL
  4210. if (conn->ssl != NULL) {
  4211. // Run SSL_shutdown twice to ensure completly close SSL connection
  4212. SSL_shutdown(conn->ssl);
  4213. SSL_free(conn->ssl);
  4214. conn->ssl = NULL;
  4215. }
  4216. #endif
  4217. if (conn->client.sock != INVALID_SOCKET) {
  4218. close_socket_gracefully(conn);
  4219. conn->client.sock = INVALID_SOCKET;
  4220. }
  4221. }
  4222. void mg_close_connection(struct mg_connection *conn) {
  4223. #ifndef NO_SSL
  4224. if (conn->client_ssl_ctx != NULL) {
  4225. SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
  4226. }
  4227. #endif
  4228. close_connection(conn);
  4229. free(conn);
  4230. }
  4231. struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
  4232. char *ebuf, size_t ebuf_len) {
  4233. static struct mg_context fake_ctx;
  4234. struct mg_connection *conn = NULL;
  4235. SOCKET sock;
  4236. if ((sock = conn2(host, port, use_ssl, ebuf, ebuf_len)) == INVALID_SOCKET) {
  4237. } else if ((conn = (struct mg_connection *)
  4238. calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
  4239. snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
  4240. closesocket(sock);
  4241. #ifndef NO_SSL
  4242. } else if (use_ssl && (conn->client_ssl_ctx =
  4243. SSL_CTX_new(SSLv23_client_method())) == NULL) {
  4244. snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
  4245. closesocket(sock);
  4246. free(conn);
  4247. conn = NULL;
  4248. #endif // NO_SSL
  4249. } else {
  4250. socklen_t len;
  4251. conn->buf_size = MAX_REQUEST_SIZE;
  4252. conn->buf = (char *) (conn + 1);
  4253. conn->ctx = &fake_ctx;
  4254. conn->client.sock = sock;
  4255. getsockname(sock, &conn->client.rsa.sa, &len);
  4256. conn->client.is_ssl = use_ssl;
  4257. #ifndef NO_SSL
  4258. if (use_ssl) {
  4259. // SSL_CTX_set_verify call is needed to switch off server certificate
  4260. // checking, which is off by default in OpenSSL and on in yaSSL.
  4261. SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
  4262. sslize(conn, conn->client_ssl_ctx, SSL_connect);
  4263. }
  4264. #endif
  4265. }
  4266. return conn;
  4267. }
  4268. static int is_valid_uri(const char *uri) {
  4269. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  4270. // URI can be an asterisk (*) or should start with slash.
  4271. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  4272. }
  4273. static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
  4274. const char *cl;
  4275. ebuf[0] = '\0';
  4276. reset_per_request_attributes(conn);
  4277. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  4278. &conn->data_len);
  4279. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  4280. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  4281. snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
  4282. } else if (conn->request_len <= 0) {
  4283. snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
  4284. } else if (parse_http_message(conn->buf, conn->buf_size,
  4285. &conn->request_info) <= 0) {
  4286. snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
  4287. } else {
  4288. // Request is valid
  4289. if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
  4290. conn->content_len = strtoll(cl, NULL, 10);
  4291. } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
  4292. !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
  4293. conn->content_len = -1;
  4294. } else {
  4295. conn->content_len = 0;
  4296. }
  4297. conn->birth_time = time(NULL);
  4298. }
  4299. return ebuf[0] == '\0';
  4300. }
  4301. struct mg_connection *mg_download(const char *host, int port, int use_ssl,
  4302. char *ebuf, size_t ebuf_len,
  4303. const char *fmt, ...) {
  4304. struct mg_connection *conn;
  4305. va_list ap;
  4306. va_start(ap, fmt);
  4307. ebuf[0] = '\0';
  4308. if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
  4309. } else if (mg_vprintf(conn, fmt, ap) <= 0) {
  4310. snprintf(ebuf, ebuf_len, "%s", "Error sending request");
  4311. } else {
  4312. getreq(conn, ebuf, ebuf_len);
  4313. }
  4314. if (ebuf[0] != '\0' && conn != NULL) {
  4315. mg_close_connection(conn);
  4316. conn = NULL;
  4317. }
  4318. return conn;
  4319. }
  4320. static void process_new_connection(struct mg_connection *conn) {
  4321. struct mg_request_info *ri = &conn->request_info;
  4322. int keep_alive_enabled, keep_alive, discard_len;
  4323. char ebuf[100];
  4324. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  4325. keep_alive = 0;
  4326. // Important: on new connection, reset the receiving buffer. Credit goes
  4327. // to crule42.
  4328. conn->data_len = 0;
  4329. do {
  4330. if (!getreq(conn, ebuf, sizeof(ebuf))) {
  4331. send_http_error(conn, 500, "Server Error", "%s", ebuf);
  4332. conn->must_close = 1;
  4333. } else if (!is_valid_uri(conn->request_info.uri)) {
  4334. snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
  4335. send_http_error(conn, 400, "Bad Request", "%s", ebuf);
  4336. } else if (strcmp(ri->http_version, "1.0") &&
  4337. strcmp(ri->http_version, "1.1")) {
  4338. snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
  4339. send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
  4340. }
  4341. if (ebuf[0] == '\0') {
  4342. handle_request(conn);
  4343. if (conn->ctx->callbacks.end_request != NULL) {
  4344. conn->ctx->callbacks.end_request(conn, conn->status_code);
  4345. }
  4346. log_access(conn);
  4347. }
  4348. if (ri->remote_user != NULL) {
  4349. free((void *) ri->remote_user);
  4350. // Important! When having connections with and without auth
  4351. // would cause double free and then crash
  4352. ri->remote_user = NULL;
  4353. }
  4354. // NOTE(lsm): order is important here. should_keep_alive() call
  4355. // is using parsed request, which will be invalid after memmove's below.
  4356. // Therefore, memorize should_keep_alive() result now for later use
  4357. // in loop exit condition.
  4358. keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
  4359. conn->content_len >= 0 && should_keep_alive(conn);
  4360. // Discard all buffered data for this request
  4361. discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
  4362. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  4363. (int) (conn->request_len + conn->content_len) : conn->data_len;
  4364. assert(discard_len >= 0);
  4365. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  4366. conn->data_len -= discard_len;
  4367. assert(conn->data_len >= 0);
  4368. assert(conn->data_len <= conn->buf_size);
  4369. } while (keep_alive);
  4370. }
  4371. // Worker threads take accepted socket from the queue
  4372. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  4373. (void) pthread_mutex_lock(&ctx->mutex);
  4374. DEBUG_TRACE(("going idle"));
  4375. // If the queue is empty, wait. We're idle at this point.
  4376. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  4377. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  4378. }
  4379. // If we're stopping, sq_head may be equal to sq_tail.
  4380. if (ctx->sq_head > ctx->sq_tail) {
  4381. // Copy socket from the queue and increment tail
  4382. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  4383. ctx->sq_tail++;
  4384. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  4385. // Wrap pointers if needed
  4386. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  4387. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  4388. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  4389. }
  4390. }
  4391. (void) pthread_cond_signal(&ctx->sq_empty);
  4392. (void) pthread_mutex_unlock(&ctx->mutex);
  4393. return !ctx->stop_flag;
  4394. }
  4395. static void *worker_thread(void *thread_func_param) {
  4396. struct mg_context *ctx = thread_func_param;
  4397. struct mg_connection *conn;
  4398. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  4399. if (conn == NULL) {
  4400. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  4401. } else {
  4402. conn->buf_size = MAX_REQUEST_SIZE;
  4403. conn->buf = (char *) (conn + 1);
  4404. conn->ctx = ctx;
  4405. conn->request_info.user_data = ctx->user_data;
  4406. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  4407. // sq_empty condvar to wake up the master waiting in produce_socket()
  4408. while (consume_socket(ctx, &conn->client)) {
  4409. conn->birth_time = time(NULL);
  4410. // Fill in IP, port info early so even if SSL setup below fails,
  4411. // error handler would have the corresponding info.
  4412. // Thanks to Johannes Winkelmann for the patch.
  4413. // TODO(lsm): Fix IPv6 case
  4414. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  4415. memcpy(&conn->request_info.remote_ip,
  4416. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  4417. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  4418. conn->request_info.is_ssl = conn->client.is_ssl;
  4419. if (!conn->client.is_ssl
  4420. #ifndef NO_SSL
  4421. || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
  4422. #endif
  4423. ) {
  4424. process_new_connection(conn);
  4425. }
  4426. close_connection(conn);
  4427. }
  4428. free(conn);
  4429. }
  4430. // Signal master that we're done with connection and exiting
  4431. (void) pthread_mutex_lock(&ctx->mutex);
  4432. ctx->num_threads--;
  4433. (void) pthread_cond_signal(&ctx->cond);
  4434. assert(ctx->num_threads >= 0);
  4435. (void) pthread_mutex_unlock(&ctx->mutex);
  4436. DEBUG_TRACE(("exiting"));
  4437. return NULL;
  4438. }
  4439. // Master thread adds accepted socket to a queue
  4440. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  4441. (void) pthread_mutex_lock(&ctx->mutex);
  4442. // If the queue is full, wait
  4443. while (ctx->stop_flag == 0 &&
  4444. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  4445. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  4446. }
  4447. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  4448. // Copy socket to the queue and increment head
  4449. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  4450. ctx->sq_head++;
  4451. DEBUG_TRACE(("queued socket %d", sp->sock));
  4452. }
  4453. (void) pthread_cond_signal(&ctx->sq_full);
  4454. (void) pthread_mutex_unlock(&ctx->mutex);
  4455. }
  4456. static int set_sock_timeout(SOCKET sock, int milliseconds) {
  4457. #ifdef _WIN32
  4458. DWORD t = milliseconds;
  4459. #else
  4460. struct timeval t;
  4461. t.tv_sec = milliseconds / 1000;
  4462. t.tv_usec = (milliseconds * 1000) % 1000000;
  4463. #endif
  4464. return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
  4465. setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
  4466. }
  4467. static void accept_new_connection(const struct socket *listener,
  4468. struct mg_context *ctx) {
  4469. struct socket so;
  4470. char src_addr[IP_ADDR_STR_LEN];
  4471. socklen_t len = sizeof(so.rsa);
  4472. int on = 1;
  4473. if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
  4474. } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
  4475. sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
  4476. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  4477. closesocket(so.sock);
  4478. } else {
  4479. // Put so socket structure into the queue
  4480. DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
  4481. set_close_on_exec(so.sock);
  4482. so.is_ssl = listener->is_ssl;
  4483. so.ssl_redir = listener->ssl_redir;
  4484. getsockname(so.sock, &so.lsa.sa, &len);
  4485. // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
  4486. // is enabled, and client resets the connection, server won't get
  4487. // TCP FIN or RST and will keep the connection open forever. With TCP
  4488. // keep-alive, next keep-alive handshake will figure out that the client
  4489. // is down and will close the server end.
  4490. // Thanks to Igor Klopov who suggested the patch.
  4491. setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
  4492. set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
  4493. produce_socket(ctx, &so);
  4494. }
  4495. }
  4496. static void *master_thread(void *thread_func_param) {
  4497. struct mg_context *ctx = thread_func_param;
  4498. struct pollfd *pfd;
  4499. int i;
  4500. // Increase priority of the master thread
  4501. #if defined(_WIN32)
  4502. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  4503. #endif
  4504. #if defined(ISSUE_317)
  4505. struct sched_param sched_param;
  4506. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  4507. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  4508. #endif
  4509. pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
  4510. while (pfd != NULL && ctx->stop_flag == 0) {
  4511. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4512. pfd[i].fd = ctx->listening_sockets[i].sock;
  4513. pfd[i].events = POLLIN;
  4514. }
  4515. if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
  4516. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4517. // NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
  4518. // successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
  4519. // Therefore, we're checking pfd[i].revents & POLLIN, not
  4520. // pfd[i].revents == POLLIN.
  4521. if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
  4522. accept_new_connection(&ctx->listening_sockets[i], ctx);
  4523. }
  4524. }
  4525. }
  4526. }
  4527. free(pfd);
  4528. DEBUG_TRACE(("stopping workers"));
  4529. // Stop signal received: somebody called mg_stop. Quit.
  4530. close_all_listening_sockets(ctx);
  4531. // Wakeup workers that are waiting for connections to handle.
  4532. pthread_cond_broadcast(&ctx->sq_full);
  4533. // Wait until all threads finish
  4534. (void) pthread_mutex_lock(&ctx->mutex);
  4535. while (ctx->num_threads > 0) {
  4536. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4537. }
  4538. (void) pthread_mutex_unlock(&ctx->mutex);
  4539. // All threads exited, no sync is needed. Destroy mutex and condvars
  4540. (void) pthread_mutex_destroy(&ctx->mutex);
  4541. (void) pthread_cond_destroy(&ctx->cond);
  4542. (void) pthread_cond_destroy(&ctx->sq_empty);
  4543. (void) pthread_cond_destroy(&ctx->sq_full);
  4544. #if !defined(NO_SSL)
  4545. uninitialize_ssl(ctx);
  4546. #endif
  4547. DEBUG_TRACE(("exiting"));
  4548. // Signal mg_stop() that we're done.
  4549. // WARNING: This must be the very last thing this
  4550. // thread does, as ctx becomes invalid after this line.
  4551. ctx->stop_flag = 2;
  4552. return NULL;
  4553. }
  4554. static void free_context(struct mg_context *ctx) {
  4555. int i;
  4556. // Deallocate config parameters
  4557. for (i = 0; i < NUM_OPTIONS; i++) {
  4558. if (ctx->config[i] != NULL)
  4559. free(ctx->config[i]);
  4560. }
  4561. #ifndef NO_SSL
  4562. // Deallocate SSL context
  4563. if (ctx->ssl_ctx != NULL) {
  4564. SSL_CTX_free(ctx->ssl_ctx);
  4565. }
  4566. if (ssl_mutexes != NULL) {
  4567. free(ssl_mutexes);
  4568. ssl_mutexes = NULL;
  4569. }
  4570. #endif // !NO_SSL
  4571. // Deallocate context itself
  4572. free(ctx);
  4573. }
  4574. void mg_stop(struct mg_context *ctx) {
  4575. ctx->stop_flag = 1;
  4576. // Wait until mg_fini() stops
  4577. while (ctx->stop_flag != 2) {
  4578. (void) mg_sleep(10);
  4579. }
  4580. free_context(ctx);
  4581. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4582. (void) WSACleanup();
  4583. #endif // _WIN32
  4584. }
  4585. struct mg_context *mg_start(const struct mg_callbacks *callbacks,
  4586. void *user_data,
  4587. const char **options) {
  4588. struct mg_context *ctx;
  4589. const char *name, *value, *default_value;
  4590. int i;
  4591. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4592. WSADATA data;
  4593. WSAStartup(MAKEWORD(2,2), &data);
  4594. InitializeCriticalSection(&global_log_file_lock);
  4595. #endif // _WIN32
  4596. // Allocate context and initialize reasonable general case defaults.
  4597. // TODO(lsm): do proper error handling here.
  4598. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4599. return NULL;
  4600. }
  4601. ctx->callbacks = *callbacks;
  4602. ctx->user_data = user_data;
  4603. while (options && (name = *options++) != NULL) {
  4604. if ((i = get_option_index(name)) == -1) {
  4605. cry(fc(ctx), "Invalid option: %s", name);
  4606. free_context(ctx);
  4607. return NULL;
  4608. } else if ((value = *options++) == NULL) {
  4609. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4610. free_context(ctx);
  4611. return NULL;
  4612. }
  4613. if (ctx->config[i] != NULL) {
  4614. cry(fc(ctx), "warning: %s: duplicate option", name);
  4615. free(ctx->config[i]);
  4616. }
  4617. ctx->config[i] = mg_strdup(value);
  4618. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4619. }
  4620. // Set default value if needed
  4621. for (i = 0; config_options[i * 2] != NULL; i++) {
  4622. default_value = config_options[i * 2 + 1];
  4623. if (ctx->config[i] == NULL && default_value != NULL) {
  4624. ctx->config[i] = mg_strdup(default_value);
  4625. }
  4626. }
  4627. // NOTE(lsm): order is important here. SSL certificates must
  4628. // be initialized before listening ports. UID must be set last.
  4629. if (!set_gpass_option(ctx) ||
  4630. #if !defined(NO_SSL)
  4631. !set_ssl_option(ctx) ||
  4632. #endif
  4633. !set_ports_option(ctx) ||
  4634. #if !defined(_WIN32)
  4635. !set_uid_option(ctx) ||
  4636. #endif
  4637. !set_acl_option(ctx)) {
  4638. free_context(ctx);
  4639. return NULL;
  4640. }
  4641. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4642. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4643. // won't kill the whole process.
  4644. (void) signal(SIGPIPE, SIG_IGN);
  4645. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4646. (void) signal(SIGCHLD, SIG_IGN);
  4647. #endif // !_WIN32
  4648. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4649. (void) pthread_cond_init(&ctx->cond, NULL);
  4650. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4651. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4652. // Start master (listening) thread
  4653. mg_start_thread(master_thread, ctx);
  4654. // Start worker threads
  4655. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4656. if (mg_start_thread(worker_thread, ctx) != 0) {
  4657. cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
  4658. } else {
  4659. ctx->num_threads++;
  4660. }
  4661. }
  4662. return ctx;
  4663. }