mongoose.c 171 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) strtoul(x, y, z)
  95. #define strtoll(x, y, z) strtol(x, y, z)
  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 HAS_POLL
  167. struct pollfd {
  168. int 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. #ifdef USE_LUA
  221. #include <lua.h>
  222. #include <lauxlib.h>
  223. #endif
  224. #define MONGOOSE_VERSION "3.8"
  225. #define PASSWORDS_FILE_NAME ".htpasswd"
  226. #define CGI_ENVIRONMENT_SIZE 4096
  227. #define MAX_CGI_ENVIR_VARS 64
  228. #define MG_BUF_LEN 8192
  229. #define MAX_REQUEST_SIZE 16384
  230. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  231. #ifdef _WIN32
  232. static CRITICAL_SECTION global_log_file_lock;
  233. static pthread_t pthread_self(void) {
  234. return GetCurrentThreadId();
  235. }
  236. #endif // _WIN32
  237. #ifdef DEBUG_TRACE
  238. #undef DEBUG_TRACE
  239. #define DEBUG_TRACE(x)
  240. #else
  241. #if defined(DEBUG)
  242. #define DEBUG_TRACE(x) do { \
  243. flockfile(stdout); \
  244. printf("*** %lu.%p.%s.%d: ", \
  245. (unsigned long) time(NULL), (void *) pthread_self(), \
  246. __func__, __LINE__); \
  247. printf x; \
  248. putchar('\n'); \
  249. fflush(stdout); \
  250. funlockfile(stdout); \
  251. } while (0)
  252. #else
  253. #define DEBUG_TRACE(x)
  254. #endif // DEBUG
  255. #endif // DEBUG_TRACE
  256. // Darwin prior to 7.0 and Win32 do not have socklen_t
  257. #ifdef NO_SOCKLEN_T
  258. typedef int socklen_t;
  259. #endif // NO_SOCKLEN_T
  260. #define _DARWIN_UNLIMITED_SELECT
  261. #if !defined(MSG_NOSIGNAL)
  262. #define MSG_NOSIGNAL 0
  263. #endif
  264. #if !defined(SOMAXCONN)
  265. #define SOMAXCONN 100
  266. #endif
  267. #if !defined(PATH_MAX)
  268. #define PATH_MAX 4096
  269. #endif
  270. static const char *http_500_error = "Internal Server Error";
  271. #if defined(NO_SSL_DL)
  272. #include <openssl/ssl.h>
  273. #else
  274. // SSL loaded dynamically from DLL.
  275. // I put the prototypes here to be independent from OpenSSL source installation.
  276. typedef struct ssl_st SSL;
  277. typedef struct ssl_method_st SSL_METHOD;
  278. typedef struct ssl_ctx_st SSL_CTX;
  279. struct ssl_func {
  280. const char *name; // SSL function name
  281. void (*ptr)(void); // Function pointer
  282. };
  283. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  284. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  285. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  286. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  287. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  288. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  289. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  290. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  291. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  292. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  293. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  294. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  295. const char *, int)) ssl_sw[11].ptr)
  296. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  297. const char *, int)) ssl_sw[12].ptr)
  298. #define SSL_CTX_set_default_passwd_cb \
  299. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  300. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  301. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  302. #define SSL_CTX_use_certificate_chain_file \
  303. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  304. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  305. #define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
  306. #define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
  307. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  308. #define CRYPTO_set_locking_callback \
  309. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  310. #define CRYPTO_set_id_callback \
  311. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  312. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  313. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  314. // set_ssl_option() function updates this array.
  315. // It loads SSL library dynamically and changes NULLs to the actual addresses
  316. // of respective functions. The macros above (like SSL_connect()) are really
  317. // just calling these functions indirectly via the pointer.
  318. static struct ssl_func ssl_sw[] = {
  319. {"SSL_free", NULL},
  320. {"SSL_accept", NULL},
  321. {"SSL_connect", NULL},
  322. {"SSL_read", NULL},
  323. {"SSL_write", NULL},
  324. {"SSL_get_error", NULL},
  325. {"SSL_set_fd", NULL},
  326. {"SSL_new", NULL},
  327. {"SSL_CTX_new", NULL},
  328. {"SSLv23_server_method", NULL},
  329. {"SSL_library_init", NULL},
  330. {"SSL_CTX_use_PrivateKey_file", NULL},
  331. {"SSL_CTX_use_certificate_file",NULL},
  332. {"SSL_CTX_set_default_passwd_cb",NULL},
  333. {"SSL_CTX_free", NULL},
  334. {"SSL_load_error_strings", NULL},
  335. {"SSL_CTX_use_certificate_chain_file", NULL},
  336. {"SSLv23_client_method", NULL},
  337. {"SSL_pending", NULL},
  338. {"SSL_CTX_set_verify", NULL},
  339. {NULL, NULL}
  340. };
  341. // Similar array as ssl_sw. These functions could be located in different lib.
  342. #if !defined(NO_SSL)
  343. static struct ssl_func crypto_sw[] = {
  344. {"CRYPTO_num_locks", NULL},
  345. {"CRYPTO_set_locking_callback", NULL},
  346. {"CRYPTO_set_id_callback", NULL},
  347. {"ERR_get_error", NULL},
  348. {"ERR_error_string", NULL},
  349. {NULL, NULL}
  350. };
  351. #endif // NO_SSL
  352. #endif // NO_SSL_DL
  353. static const char *month_names[] = {
  354. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  355. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  356. };
  357. // Unified socket address. For IPv6 support, add IPv6 address structure
  358. // in the union u.
  359. union usa {
  360. struct sockaddr sa;
  361. struct sockaddr_in sin;
  362. #if defined(USE_IPV6)
  363. struct sockaddr_in6 sin6;
  364. #endif
  365. };
  366. // Describes a string (chunk of memory).
  367. struct vec {
  368. const char *ptr;
  369. size_t len;
  370. };
  371. struct file {
  372. int is_directory;
  373. time_t modification_time;
  374. int64_t size;
  375. FILE *fp;
  376. const char *membuf; // Non-NULL if file data is in memory
  377. };
  378. #define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
  379. // Describes listening socket, or socket which was accept()-ed by the master
  380. // thread and queued for future handling by the worker thread.
  381. struct socket {
  382. SOCKET sock; // Listening socket
  383. union usa lsa; // Local socket address
  384. union usa rsa; // Remote socket address
  385. unsigned is_ssl:1; // Is port SSL-ed
  386. unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
  387. };
  388. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  389. enum {
  390. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  391. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  392. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  393. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  394. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  395. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
  396. NUM_OPTIONS
  397. };
  398. static const char *config_options[] = {
  399. "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  400. "cgi_environment", NULL,
  401. "put_delete_auth_file", NULL,
  402. "cgi_interpreter", NULL,
  403. "protect_uri", NULL,
  404. "authentication_domain", "mydomain.com",
  405. "ssi_pattern", "**.shtml$|**.shtm$",
  406. "throttle", NULL,
  407. "access_log_file", NULL,
  408. "enable_directory_listing", "yes",
  409. "error_log_file", NULL,
  410. "global_auth_file", NULL,
  411. "index_files",
  412. "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
  413. "enable_keep_alive", "no",
  414. "access_control_list", NULL,
  415. "extra_mime_types", NULL,
  416. "listening_ports", "8080",
  417. "document_root", ".",
  418. "ssl_certificate", NULL,
  419. "num_threads", "50",
  420. "run_as_user", NULL,
  421. "url_rewrite_patterns", NULL,
  422. "hide_files_patterns", NULL,
  423. "request_timeout_ms", "30000",
  424. NULL
  425. };
  426. struct mg_context {
  427. volatile int stop_flag; // Should we stop event loop
  428. SSL_CTX *ssl_ctx; // SSL context
  429. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  430. struct mg_callbacks callbacks; // User-defined callback function
  431. void *user_data; // User-defined data
  432. struct socket *listening_sockets;
  433. int num_listening_sockets;
  434. volatile int num_threads; // Number of threads
  435. pthread_mutex_t mutex; // Protects (max|num)_threads
  436. pthread_cond_t cond; // Condvar for tracking workers terminations
  437. struct socket queue[20]; // Accepted sockets
  438. volatile int sq_head; // Head of the socket queue
  439. volatile int sq_tail; // Tail of the socket queue
  440. pthread_cond_t sq_full; // Signaled when socket is produced
  441. pthread_cond_t sq_empty; // Signaled when socket is consumed
  442. };
  443. struct mg_connection {
  444. struct mg_request_info request_info;
  445. struct mg_context *ctx;
  446. SSL *ssl; // SSL descriptor
  447. SSL_CTX *client_ssl_ctx; // SSL context for client connections
  448. struct socket client; // Connected client
  449. time_t birth_time; // Time when request was received
  450. int64_t num_bytes_sent; // Total bytes sent to client
  451. int64_t content_len; // Content-Length header value
  452. int64_t consumed_content; // How many bytes of content have been read
  453. char *buf; // Buffer for received data
  454. char *path_info; // PATH_INFO part of the URL
  455. int must_close; // 1 if connection must be closed
  456. int buf_size; // Buffer size
  457. int request_len; // Size of the request + headers in a buffer
  458. int data_len; // Total size of data in a buffer
  459. int status_code; // HTTP reply status code, e.g. 200
  460. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  461. time_t last_throttle_time; // Last time throttled data was sent
  462. int64_t last_throttle_bytes;// Bytes sent this second
  463. };
  464. const char **mg_get_valid_option_names(void) {
  465. return config_options;
  466. }
  467. static int is_file_in_memory(struct mg_connection *conn, const char *path,
  468. struct file *filep) {
  469. size_t size = 0;
  470. if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
  471. conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
  472. // NOTE: override filep->size only on success. Otherwise, it might break
  473. // constructs like if (!mg_stat() || !mg_fopen()) ...
  474. filep->size = size;
  475. }
  476. return filep->membuf != NULL;
  477. }
  478. static int is_file_opened(const struct file *filep) {
  479. return filep->membuf != NULL || filep->fp != NULL;
  480. }
  481. static int mg_fopen(struct mg_connection *conn, const char *path,
  482. const char *mode, struct file *filep) {
  483. if (!is_file_in_memory(conn, path, filep)) {
  484. #ifdef _WIN32
  485. wchar_t wbuf[PATH_MAX], wmode[20];
  486. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  487. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  488. filep->fp = _wfopen(wbuf, wmode);
  489. #else
  490. filep->fp = fopen(path, mode);
  491. #endif
  492. }
  493. return is_file_opened(filep);
  494. }
  495. static void mg_fclose(struct file *filep) {
  496. if (filep != NULL && filep->fp != NULL) {
  497. fclose(filep->fp);
  498. }
  499. }
  500. static int get_option_index(const char *name) {
  501. int i;
  502. for (i = 0; config_options[i * 2] != NULL; i++) {
  503. if (strcmp(config_options[i * 2], name) == 0) {
  504. return i;
  505. }
  506. }
  507. return -1;
  508. }
  509. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  510. int i;
  511. if ((i = get_option_index(name)) == -1) {
  512. return NULL;
  513. } else if (ctx->config[i] == NULL) {
  514. return "";
  515. } else {
  516. return ctx->config[i];
  517. }
  518. }
  519. static void sockaddr_to_string(char *buf, size_t len,
  520. const union usa *usa) {
  521. buf[0] = '\0';
  522. #if defined(USE_IPV6)
  523. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  524. (void *) &usa->sin.sin_addr :
  525. (void *) &usa->sin6.sin6_addr, buf, len);
  526. #elif defined(_WIN32)
  527. // Only Windoze Vista (and newer) have inet_ntop()
  528. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  529. #else
  530. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  531. #endif
  532. }
  533. static void cry(struct mg_connection *conn,
  534. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  535. // Print error message to the opened error log stream.
  536. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  537. char buf[MG_BUF_LEN], src_addr[20];
  538. va_list ap;
  539. FILE *fp;
  540. time_t timestamp;
  541. va_start(ap, fmt);
  542. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  543. va_end(ap);
  544. // Do not lock when getting the callback value, here and below.
  545. // I suppose this is fine, since function cannot disappear in the
  546. // same way string option can.
  547. if (conn->ctx->callbacks.log_message == NULL ||
  548. conn->ctx->callbacks.log_message(conn, buf) == 0) {
  549. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  550. fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  551. if (fp != NULL) {
  552. flockfile(fp);
  553. timestamp = time(NULL);
  554. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  555. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  556. src_addr);
  557. if (conn->request_info.request_method != NULL) {
  558. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  559. conn->request_info.uri);
  560. }
  561. fprintf(fp, "%s", buf);
  562. fputc('\n', fp);
  563. funlockfile(fp);
  564. fclose(fp);
  565. }
  566. }
  567. }
  568. // Return fake connection structure. Used for logging, if connection
  569. // is not applicable at the moment of logging.
  570. static struct mg_connection *fc(struct mg_context *ctx) {
  571. static struct mg_connection fake_connection;
  572. fake_connection.ctx = ctx;
  573. return &fake_connection;
  574. }
  575. const char *mg_version(void) {
  576. return MONGOOSE_VERSION;
  577. }
  578. struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
  579. return &conn->request_info;
  580. }
  581. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  582. for (; *src != '\0' && n > 1; n--) {
  583. *dst++ = *src++;
  584. }
  585. *dst = '\0';
  586. }
  587. static int lowercase(const char *s) {
  588. return tolower(* (const unsigned char *) s);
  589. }
  590. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  591. int diff = 0;
  592. if (len > 0)
  593. do {
  594. diff = lowercase(s1++) - lowercase(s2++);
  595. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  596. return diff;
  597. }
  598. static int mg_strcasecmp(const char *s1, const char *s2) {
  599. int diff;
  600. do {
  601. diff = lowercase(s1++) - lowercase(s2++);
  602. } while (diff == 0 && s1[-1] != '\0');
  603. return diff;
  604. }
  605. static char * mg_strndup(const char *ptr, size_t len) {
  606. char *p;
  607. if ((p = (char *) malloc(len + 1)) != NULL) {
  608. mg_strlcpy(p, ptr, len + 1);
  609. }
  610. return p;
  611. }
  612. static char * mg_strdup(const char *str) {
  613. return mg_strndup(str, strlen(str));
  614. }
  615. static const char *mg_strcasestr(const char *big_str, const char *small_str) {
  616. int i, big_len = strlen(big_str), small_len = strlen(small_str);
  617. for (i = 0; i <= big_len - small_len; i++) {
  618. if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
  619. return big_str + i;
  620. }
  621. }
  622. return NULL;
  623. }
  624. // Like snprintf(), but never returns negative value, or a value
  625. // that is larger than a supplied buffer.
  626. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  627. // in his audit report.
  628. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  629. const char *fmt, va_list ap) {
  630. int n;
  631. if (buflen == 0)
  632. return 0;
  633. n = vsnprintf(buf, buflen, fmt, ap);
  634. if (n < 0) {
  635. cry(conn, "vsnprintf error");
  636. n = 0;
  637. } else if (n >= (int) buflen) {
  638. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  639. n > 200 ? 200 : n, buf);
  640. n = (int) buflen - 1;
  641. }
  642. buf[n] = '\0';
  643. return n;
  644. }
  645. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  646. PRINTF_FORMAT_STRING(const char *fmt), ...)
  647. PRINTF_ARGS(4, 5);
  648. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  649. const char *fmt, ...) {
  650. va_list ap;
  651. int n;
  652. va_start(ap, fmt);
  653. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  654. va_end(ap);
  655. return n;
  656. }
  657. // Skip the characters until one of the delimiters characters found.
  658. // 0-terminate resulting word. Skip the delimiter and following whitespaces.
  659. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  660. // Delimiters can be quoted with quotechar.
  661. static char *skip_quoted(char **buf, const char *delimiters,
  662. const char *whitespace, char quotechar) {
  663. char *p, *begin_word, *end_word, *end_whitespace;
  664. begin_word = *buf;
  665. end_word = begin_word + strcspn(begin_word, delimiters);
  666. // Check for quotechar
  667. if (end_word > begin_word) {
  668. p = end_word - 1;
  669. while (*p == quotechar) {
  670. // If there is anything beyond end_word, copy it
  671. if (*end_word == '\0') {
  672. *p = '\0';
  673. break;
  674. } else {
  675. size_t end_off = strcspn(end_word + 1, delimiters);
  676. memmove (p, end_word, end_off + 1);
  677. p += end_off; // p must correspond to end_word - 1
  678. end_word += end_off + 1;
  679. }
  680. }
  681. for (p++; p < end_word; p++) {
  682. *p = '\0';
  683. }
  684. }
  685. if (*end_word == '\0') {
  686. *buf = end_word;
  687. } else {
  688. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  689. for (p = end_word; p < end_whitespace; p++) {
  690. *p = '\0';
  691. }
  692. *buf = end_whitespace;
  693. }
  694. return begin_word;
  695. }
  696. // Simplified version of skip_quoted without quote char
  697. // and whitespace == delimiters
  698. static char *skip(char **buf, const char *delimiters) {
  699. return skip_quoted(buf, delimiters, delimiters, 0);
  700. }
  701. // Return HTTP header value, or NULL if not found.
  702. static const char *get_header(const struct mg_request_info *ri,
  703. const char *name) {
  704. int i;
  705. for (i = 0; i < ri->num_headers; i++)
  706. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  707. return ri->http_headers[i].value;
  708. return NULL;
  709. }
  710. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  711. return get_header(&conn->request_info, name);
  712. }
  713. // A helper function for traversing a comma separated list of values.
  714. // It returns a list pointer shifted to the next value, or NULL if the end
  715. // of the list found.
  716. // Value is stored in val vector. If value has form "x=y", then eq_val
  717. // vector is initialized to point to the "y" part, and val vector length
  718. // is adjusted to point only to "x".
  719. static const char *next_option(const char *list, struct vec *val,
  720. struct vec *eq_val) {
  721. if (list == NULL || *list == '\0') {
  722. // End of the list
  723. list = NULL;
  724. } else {
  725. val->ptr = list;
  726. if ((list = strchr(val->ptr, ',')) != NULL) {
  727. // Comma found. Store length and shift the list ptr
  728. val->len = list - val->ptr;
  729. list++;
  730. } else {
  731. // This value is the last one
  732. list = val->ptr + strlen(val->ptr);
  733. val->len = list - val->ptr;
  734. }
  735. if (eq_val != NULL) {
  736. // Value has form "x=y", adjust pointers and lengths
  737. // so that val points to "x", and eq_val points to "y".
  738. eq_val->len = 0;
  739. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  740. if (eq_val->ptr != NULL) {
  741. eq_val->ptr++; // Skip over '=' character
  742. eq_val->len = val->ptr + val->len - eq_val->ptr;
  743. val->len = (eq_val->ptr - val->ptr) - 1;
  744. }
  745. }
  746. }
  747. return list;
  748. }
  749. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  750. const char *or_str;
  751. int i, j, len, res;
  752. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  753. res = match_prefix(pattern, or_str - pattern, str);
  754. return res > 0 ? res :
  755. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  756. }
  757. i = j = 0;
  758. res = -1;
  759. for (; i < pattern_len; i++, j++) {
  760. if (pattern[i] == '?' && str[j] != '\0') {
  761. continue;
  762. } else if (pattern[i] == '$') {
  763. return str[j] == '\0' ? j : -1;
  764. } else if (pattern[i] == '*') {
  765. i++;
  766. if (pattern[i] == '*') {
  767. i++;
  768. len = (int) strlen(str + j);
  769. } else {
  770. len = (int) strcspn(str + j, "/");
  771. }
  772. if (i == pattern_len) {
  773. return j + len;
  774. }
  775. do {
  776. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  777. } while (res == -1 && len-- > 0);
  778. return res == -1 ? -1 : j + res + len;
  779. } else if (pattern[i] != str[j]) {
  780. return -1;
  781. }
  782. }
  783. return j;
  784. }
  785. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  786. // This function must tolerate situations when connection info is not
  787. // set up, for example if request parsing failed.
  788. static int should_keep_alive(const struct mg_connection *conn) {
  789. const char *http_version = conn->request_info.http_version;
  790. const char *header = mg_get_header(conn, "Connection");
  791. if (conn->must_close ||
  792. conn->status_code == 401 ||
  793. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  794. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  795. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  796. return 0;
  797. }
  798. return 1;
  799. }
  800. static const char *suggest_connection_header(const struct mg_connection *conn) {
  801. return should_keep_alive(conn) ? "keep-alive" : "close";
  802. }
  803. static void send_http_error(struct mg_connection *, int, const char *,
  804. PRINTF_FORMAT_STRING(const char *fmt), ...)
  805. PRINTF_ARGS(4, 5);
  806. static void send_http_error(struct mg_connection *conn, int status,
  807. const char *reason, const char *fmt, ...) {
  808. char buf[MG_BUF_LEN];
  809. va_list ap;
  810. int len = 0;
  811. conn->status_code = status;
  812. if (conn->ctx->callbacks.http_error == NULL ||
  813. conn->ctx->callbacks.http_error(conn, status)) {
  814. buf[0] = '\0';
  815. // Errors 1xx, 204 and 304 MUST NOT send a body
  816. if (status > 199 && status != 204 && status != 304) {
  817. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  818. buf[len++] = '\n';
  819. va_start(ap, fmt);
  820. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  821. va_end(ap);
  822. }
  823. DEBUG_TRACE(("[%s]", buf));
  824. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  825. "Content-Length: %d\r\n"
  826. "Connection: %s\r\n\r\n", status, reason, len,
  827. suggest_connection_header(conn));
  828. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  829. }
  830. }
  831. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  832. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  833. (void) unused;
  834. *mutex = CreateMutex(NULL, FALSE, NULL);
  835. return *mutex == NULL ? -1 : 0;
  836. }
  837. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  838. return CloseHandle(*mutex) == 0 ? -1 : 0;
  839. }
  840. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  841. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  842. }
  843. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  844. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  845. }
  846. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  847. (void) unused;
  848. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  849. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  850. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  851. }
  852. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  853. HANDLE handles[] = {cv->signal, cv->broadcast};
  854. ReleaseMutex(*mutex);
  855. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  856. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  857. }
  858. static int pthread_cond_signal(pthread_cond_t *cv) {
  859. return SetEvent(cv->signal) == 0 ? -1 : 0;
  860. }
  861. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  862. // Implementation with PulseEvent() has race condition, see
  863. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  864. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  865. }
  866. static int pthread_cond_destroy(pthread_cond_t *cv) {
  867. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  868. }
  869. // For Windows, change all slashes to backslashes in path names.
  870. static void change_slashes_to_backslashes(char *path) {
  871. int i;
  872. for (i = 0; path[i] != '\0'; i++) {
  873. if (path[i] == '/')
  874. path[i] = '\\';
  875. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  876. if (path[i] == '\\' && i > 0)
  877. while (path[i + 1] == '\\' || path[i + 1] == '/')
  878. (void) memmove(path + i + 1,
  879. path + i + 2, strlen(path + i + 1));
  880. }
  881. }
  882. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  883. // wbuf and wbuf_len is a target buffer and its length.
  884. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  885. char buf[PATH_MAX], buf2[PATH_MAX];
  886. mg_strlcpy(buf, path, sizeof(buf));
  887. change_slashes_to_backslashes(buf);
  888. // Convert to Unicode and back. If doubly-converted string does not
  889. // match the original, something is fishy, reject.
  890. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  891. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  892. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  893. NULL, NULL);
  894. if (strcmp(buf, buf2) != 0) {
  895. wbuf[0] = L'\0';
  896. }
  897. }
  898. #if defined(_WIN32_WCE)
  899. static time_t time(time_t *ptime) {
  900. time_t t;
  901. SYSTEMTIME st;
  902. FILETIME ft;
  903. GetSystemTime(&st);
  904. SystemTimeToFileTime(&st, &ft);
  905. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  906. if (ptime != NULL) {
  907. *ptime = t;
  908. }
  909. return t;
  910. }
  911. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  912. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  913. FILETIME ft, lft;
  914. SYSTEMTIME st;
  915. TIME_ZONE_INFORMATION tzinfo;
  916. if (ptm == NULL) {
  917. return NULL;
  918. }
  919. * (int64_t *) &ft = t;
  920. FileTimeToLocalFileTime(&ft, &lft);
  921. FileTimeToSystemTime(&lft, &st);
  922. ptm->tm_year = st.wYear - 1900;
  923. ptm->tm_mon = st.wMonth - 1;
  924. ptm->tm_wday = st.wDayOfWeek;
  925. ptm->tm_mday = st.wDay;
  926. ptm->tm_hour = st.wHour;
  927. ptm->tm_min = st.wMinute;
  928. ptm->tm_sec = st.wSecond;
  929. ptm->tm_yday = 0; // hope nobody uses this
  930. ptm->tm_isdst =
  931. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  932. return ptm;
  933. }
  934. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  935. // FIXME(lsm): fix this.
  936. return localtime(ptime, ptm);
  937. }
  938. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  939. const struct tm *tm) {
  940. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  941. return 0;
  942. }
  943. #endif
  944. // Windows happily opens files with some garbage at the end of file name.
  945. // For example, fopen("a.cgi ", "r") on Windows successfully opens
  946. // "a.cgi", despite one would expect an error back.
  947. // This function returns non-0 if path ends with some garbage.
  948. static int path_cannot_disclose_cgi(const char *path) {
  949. static const char *allowed_last_characters = "_-";
  950. int last = path[strlen(path) - 1];
  951. return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
  952. }
  953. static int mg_stat(struct mg_connection *conn, const char *path,
  954. struct file *filep) {
  955. wchar_t wbuf[PATH_MAX];
  956. WIN32_FILE_ATTRIBUTE_DATA info;
  957. if (!is_file_in_memory(conn, path, filep)) {
  958. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  959. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  960. filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  961. filep->modification_time = SYS2UNIX_TIME(
  962. info.ftLastWriteTime.dwLowDateTime,
  963. info.ftLastWriteTime.dwHighDateTime);
  964. filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  965. // If file name is fishy, reset the file structure and return error.
  966. // Note it is important to reset, not just return the error, cause
  967. // functions like is_file_opened() check the struct.
  968. if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
  969. memset(filep, 0, sizeof(*filep));
  970. }
  971. }
  972. }
  973. return filep->membuf != NULL || filep->modification_time != 0;
  974. }
  975. static int mg_remove(const char *path) {
  976. wchar_t wbuf[PATH_MAX];
  977. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  978. return DeleteFileW(wbuf) ? 0 : -1;
  979. }
  980. static int mg_mkdir(const char *path, int mode) {
  981. char buf[PATH_MAX];
  982. wchar_t wbuf[PATH_MAX];
  983. (void) mode;
  984. mg_strlcpy(buf, path, sizeof(buf));
  985. change_slashes_to_backslashes(buf);
  986. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
  987. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  988. }
  989. // Implementation of POSIX opendir/closedir/readdir for Windows.
  990. static DIR * opendir(const char *name) {
  991. DIR *dir = NULL;
  992. wchar_t wpath[PATH_MAX];
  993. DWORD attrs;
  994. if (name == NULL) {
  995. SetLastError(ERROR_BAD_ARGUMENTS);
  996. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  997. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  998. } else {
  999. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  1000. attrs = GetFileAttributesW(wpath);
  1001. if (attrs != 0xFFFFFFFF &&
  1002. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  1003. (void) wcscat(wpath, L"\\*");
  1004. dir->handle = FindFirstFileW(wpath, &dir->info);
  1005. dir->result.d_name[0] = '\0';
  1006. } else {
  1007. free(dir);
  1008. dir = NULL;
  1009. }
  1010. }
  1011. return dir;
  1012. }
  1013. static int closedir(DIR *dir) {
  1014. int result = 0;
  1015. if (dir != NULL) {
  1016. if (dir->handle != INVALID_HANDLE_VALUE)
  1017. result = FindClose(dir->handle) ? 0 : -1;
  1018. free(dir);
  1019. } else {
  1020. result = -1;
  1021. SetLastError(ERROR_BAD_ARGUMENTS);
  1022. }
  1023. return result;
  1024. }
  1025. static struct dirent *readdir(DIR *dir) {
  1026. struct dirent *result = 0;
  1027. if (dir) {
  1028. if (dir->handle != INVALID_HANDLE_VALUE) {
  1029. result = &dir->result;
  1030. (void) WideCharToMultiByte(CP_UTF8, 0,
  1031. dir->info.cFileName, -1, result->d_name,
  1032. sizeof(result->d_name), NULL, NULL);
  1033. if (!FindNextFileW(dir->handle, &dir->info)) {
  1034. (void) FindClose(dir->handle);
  1035. dir->handle = INVALID_HANDLE_VALUE;
  1036. }
  1037. } else {
  1038. SetLastError(ERROR_FILE_NOT_FOUND);
  1039. }
  1040. } else {
  1041. SetLastError(ERROR_BAD_ARGUMENTS);
  1042. }
  1043. return result;
  1044. }
  1045. #ifndef HAVE_POLL
  1046. static int poll(struct pollfd *pfd, int n, int milliseconds) {
  1047. struct timeval tv;
  1048. fd_set set;
  1049. int i, result;
  1050. tv.tv_sec = milliseconds / 1000;
  1051. tv.tv_usec = (milliseconds % 1000) * 1000;
  1052. FD_ZERO(&set);
  1053. for (i = 0; i < n; i++) {
  1054. FD_SET((SOCKET) pfd[i].fd, &set);
  1055. pfd[i].revents = 0;
  1056. }
  1057. if ((result = select(0, &set, NULL, NULL, &tv)) > 0) {
  1058. for (i = 0; i < n; i++) {
  1059. if (FD_ISSET(pfd[i].fd, &set)) {
  1060. pfd[i].revents = POLLIN;
  1061. }
  1062. }
  1063. }
  1064. return result;
  1065. }
  1066. #endif // HAVE_POLL
  1067. #define set_close_on_exec(x) // No FD_CLOEXEC on Windows
  1068. int mg_start_thread(mg_thread_func_t f, void *p) {
  1069. return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1070. }
  1071. static HANDLE dlopen(const char *dll_name, int flags) {
  1072. wchar_t wbuf[PATH_MAX];
  1073. (void) flags;
  1074. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1075. return LoadLibraryW(wbuf);
  1076. }
  1077. #if !defined(NO_CGI)
  1078. #define SIGKILL 0
  1079. static int kill(pid_t pid, int sig_num) {
  1080. (void) TerminateProcess(pid, sig_num);
  1081. (void) CloseHandle(pid);
  1082. return 0;
  1083. }
  1084. static void trim_trailing_whitespaces(char *s) {
  1085. char *e = s + strlen(s) - 1;
  1086. while (e > s && isspace(* (unsigned char *) e)) {
  1087. *e-- = '\0';
  1088. }
  1089. }
  1090. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1091. char *envblk, char *envp[], int fd_stdin,
  1092. int fd_stdout, const char *dir) {
  1093. HANDLE me;
  1094. char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
  1095. cmdline[PATH_MAX], buf[PATH_MAX];
  1096. struct file file = STRUCT_FILE_INITIALIZER;
  1097. STARTUPINFOA si;
  1098. PROCESS_INFORMATION pi = { 0 };
  1099. (void) envp;
  1100. memset(&si, 0, sizeof(si));
  1101. si.cb = sizeof(si);
  1102. // TODO(lsm): redirect CGI errors to the error log file
  1103. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1104. si.wShowWindow = SW_HIDE;
  1105. me = GetCurrentProcess();
  1106. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  1107. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1108. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  1109. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1110. // If CGI file is a script, try to read the interpreter line
  1111. interp = conn->ctx->config[CGI_INTERPRETER];
  1112. if (interp == NULL) {
  1113. buf[0] = buf[1] = '\0';
  1114. // Read the first line of the script into the buffer
  1115. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1116. if (mg_fopen(conn, cmdline, "r", &file)) {
  1117. p = (char *) file.membuf;
  1118. mg_fgets(buf, sizeof(buf), &file, &p);
  1119. mg_fclose(&file);
  1120. buf[sizeof(buf) - 1] = '\0';
  1121. }
  1122. if (buf[0] == '#' && buf[1] == '!') {
  1123. trim_trailing_whitespaces(buf + 2);
  1124. } else {
  1125. buf[2] = '\0';
  1126. }
  1127. interp = buf + 2;
  1128. }
  1129. if (interp[0] != '\0') {
  1130. GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
  1131. interp = full_interp;
  1132. }
  1133. GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
  1134. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s\\%s",
  1135. interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
  1136. DEBUG_TRACE(("Running [%s]", cmdline));
  1137. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1138. CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
  1139. cry(conn, "%s: CreateProcess(%s): %ld",
  1140. __func__, cmdline, ERRNO);
  1141. pi.hProcess = (pid_t) -1;
  1142. }
  1143. // Always close these to prevent handle leakage.
  1144. (void) close(fd_stdin);
  1145. (void) close(fd_stdout);
  1146. (void) CloseHandle(si.hStdOutput);
  1147. (void) CloseHandle(si.hStdInput);
  1148. (void) CloseHandle(pi.hThread);
  1149. return (pid_t) pi.hProcess;
  1150. }
  1151. #endif // !NO_CGI
  1152. static int set_non_blocking_mode(SOCKET sock) {
  1153. unsigned long on = 1;
  1154. return ioctlsocket(sock, FIONBIO, &on);
  1155. }
  1156. #else
  1157. static int mg_stat(struct mg_connection *conn, const char *path,
  1158. struct file *filep) {
  1159. struct stat st;
  1160. if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
  1161. filep->size = st.st_size;
  1162. filep->modification_time = st.st_mtime;
  1163. filep->is_directory = S_ISDIR(st.st_mode);
  1164. } else {
  1165. filep->modification_time = (time_t) 0;
  1166. }
  1167. return filep->membuf != NULL || filep->modification_time != (time_t) 0;
  1168. }
  1169. static void set_close_on_exec(int fd) {
  1170. fcntl(fd, F_SETFD, FD_CLOEXEC);
  1171. }
  1172. int mg_start_thread(mg_thread_func_t func, void *param) {
  1173. pthread_t thread_id;
  1174. pthread_attr_t attr;
  1175. (void) pthread_attr_init(&attr);
  1176. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1177. // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
  1178. // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
  1179. return pthread_create(&thread_id, &attr, func, param);
  1180. }
  1181. #ifndef NO_CGI
  1182. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1183. char *envblk, char *envp[], int fd_stdin,
  1184. int fd_stdout, const char *dir) {
  1185. pid_t pid;
  1186. const char *interp;
  1187. (void) envblk;
  1188. if ((pid = fork()) == -1) {
  1189. // Parent
  1190. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1191. } else if (pid == 0) {
  1192. // Child
  1193. if (chdir(dir) != 0) {
  1194. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1195. } else if (dup2(fd_stdin, 0) == -1) {
  1196. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1197. } else if (dup2(fd_stdout, 1) == -1) {
  1198. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1199. } else {
  1200. (void) dup2(fd_stdout, 2);
  1201. (void) close(fd_stdin);
  1202. (void) close(fd_stdout);
  1203. // After exec, all signal handlers are restored to their default values,
  1204. // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
  1205. // implementation, SIGCHLD's handler will leave unchanged after exec
  1206. // if it was set to be ignored. Restore it to default action.
  1207. signal(SIGCHLD, SIG_DFL);
  1208. interp = conn->ctx->config[CGI_INTERPRETER];
  1209. if (interp == NULL) {
  1210. (void) execle(prog, prog, NULL, envp);
  1211. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1212. } else {
  1213. (void) execle(interp, interp, prog, NULL, envp);
  1214. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1215. strerror(ERRNO));
  1216. }
  1217. }
  1218. exit(EXIT_FAILURE);
  1219. }
  1220. // Parent. Close stdio descriptors
  1221. (void) close(fd_stdin);
  1222. (void) close(fd_stdout);
  1223. return pid;
  1224. }
  1225. #endif // !NO_CGI
  1226. static int set_non_blocking_mode(SOCKET sock) {
  1227. int flags;
  1228. flags = fcntl(sock, F_GETFL, 0);
  1229. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1230. return 0;
  1231. }
  1232. #endif // _WIN32
  1233. // Write data to the IO channel - opened file descriptor, socket or SSL
  1234. // descriptor. Return number of bytes written.
  1235. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1236. int64_t len) {
  1237. int64_t sent;
  1238. int n, k;
  1239. (void) ssl; // Get rid of warning
  1240. sent = 0;
  1241. while (sent < len) {
  1242. // How many bytes we send in this iteration
  1243. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1244. #ifndef NO_SSL
  1245. if (ssl != NULL) {
  1246. n = SSL_write(ssl, buf + sent, k);
  1247. } else
  1248. #endif
  1249. if (fp != NULL) {
  1250. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1251. if (ferror(fp))
  1252. n = -1;
  1253. } else {
  1254. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1255. }
  1256. if (n <= 0)
  1257. break;
  1258. sent += n;
  1259. }
  1260. return sent;
  1261. }
  1262. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1263. // Return negative value on error, or number of bytes read on success.
  1264. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1265. int nread;
  1266. if (fp != NULL) {
  1267. // Use read() instead of fread(), because if we're reading from the CGI
  1268. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1269. // to block and must pass all read bytes immediately to the client.
  1270. nread = read(fileno(fp), buf, (size_t) len);
  1271. #ifndef NO_SSL
  1272. } else if (conn->ssl != NULL) {
  1273. nread = SSL_read(conn->ssl, buf, len);
  1274. #endif
  1275. } else {
  1276. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1277. }
  1278. return conn->ctx->stop_flag ? -1 : nread;
  1279. }
  1280. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1281. int n, buffered_len, nread;
  1282. const char *body;
  1283. nread = 0;
  1284. if (conn->consumed_content < conn->content_len) {
  1285. // Adjust number of bytes to read.
  1286. int64_t to_read = conn->content_len - conn->consumed_content;
  1287. if (to_read < (int64_t) len) {
  1288. len = (size_t) to_read;
  1289. }
  1290. // Return buffered data
  1291. body = conn->buf + conn->request_len + conn->consumed_content;
  1292. buffered_len = &conn->buf[conn->data_len] - body;
  1293. if (buffered_len > 0) {
  1294. if (len < (size_t) buffered_len) {
  1295. buffered_len = (int) len;
  1296. }
  1297. memcpy(buf, body, (size_t) buffered_len);
  1298. len -= buffered_len;
  1299. conn->consumed_content += buffered_len;
  1300. nread += buffered_len;
  1301. buf = (char *) buf + buffered_len;
  1302. }
  1303. // We have returned all buffered data. Read new data from the remote socket.
  1304. while (len > 0) {
  1305. n = pull(NULL, conn, (char *) buf, (int) len);
  1306. if (n < 0) {
  1307. nread = n; // Propagate the error
  1308. break;
  1309. } else if (n == 0) {
  1310. break; // No more data to read
  1311. } else {
  1312. buf = (char *) buf + n;
  1313. conn->consumed_content += n;
  1314. nread += n;
  1315. len -= n;
  1316. }
  1317. }
  1318. }
  1319. return nread;
  1320. }
  1321. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1322. time_t now;
  1323. int64_t n, total, allowed;
  1324. if (conn->throttle > 0) {
  1325. if ((now = time(NULL)) != conn->last_throttle_time) {
  1326. conn->last_throttle_time = now;
  1327. conn->last_throttle_bytes = 0;
  1328. }
  1329. allowed = conn->throttle - conn->last_throttle_bytes;
  1330. if (allowed > (int64_t) len) {
  1331. allowed = len;
  1332. }
  1333. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1334. (int64_t) allowed)) == allowed) {
  1335. buf = (char *) buf + total;
  1336. conn->last_throttle_bytes += total;
  1337. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1338. allowed = conn->throttle > (int64_t) len - total ?
  1339. (int64_t) len - total : conn->throttle;
  1340. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1341. (int64_t) allowed)) != allowed) {
  1342. break;
  1343. }
  1344. sleep(1);
  1345. conn->last_throttle_bytes = allowed;
  1346. conn->last_throttle_time = time(NULL);
  1347. buf = (char *) buf + n;
  1348. total += n;
  1349. }
  1350. }
  1351. } else {
  1352. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1353. (int64_t) len);
  1354. }
  1355. return (int) total;
  1356. }
  1357. // Print message to buffer. If buffer is large enough to hold the message,
  1358. // return buffer. If buffer is to small, allocate large enough buffer on heap,
  1359. // and return allocated buffer.
  1360. static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
  1361. va_list ap_copy;
  1362. int len;
  1363. // Windows is not standard-compliant, and vsnprintf() returns -1 if
  1364. // buffer is too small. Also, older versions of msvcrt.dll do not have
  1365. // _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
  1366. // Therefore, we make two passes: on first pass, get required message length.
  1367. // On second pass, actually print the message.
  1368. va_copy(ap_copy, ap);
  1369. len = vsnprintf(NULL, 0, fmt, ap_copy);
  1370. if (len > (int) size &&
  1371. (size = len + 1) > 0 &&
  1372. (*buf = (char *) malloc(size)) == NULL) {
  1373. len = -1; // Allocation failed, mark failure
  1374. } else {
  1375. va_copy(ap_copy, ap);
  1376. vsnprintf(*buf, size, fmt, ap_copy);
  1377. }
  1378. return len;
  1379. }
  1380. int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
  1381. char mem[MG_BUF_LEN], *buf = mem;
  1382. int len;
  1383. if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
  1384. len = mg_write(conn, buf, (size_t) len);
  1385. }
  1386. if (buf != mem && buf != NULL) {
  1387. free(buf);
  1388. }
  1389. return len;
  1390. }
  1391. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1392. va_list ap;
  1393. va_start(ap, fmt);
  1394. return mg_vprintf(conn, fmt, ap);
  1395. }
  1396. // URL-decode input buffer into destination buffer.
  1397. // 0-terminate the destination buffer. Return the length of decoded data.
  1398. // form-url-encoded data differs from URI encoding in a way that it
  1399. // uses '+' as character for space, see RFC 1866 section 8.2.1
  1400. // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
  1401. static int url_decode(const char *src, int src_len, char *dst,
  1402. int dst_len, int is_form_url_encoded) {
  1403. int i, j, a, b;
  1404. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1405. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1406. if (src[i] == '%' && i < src_len - 2 &&
  1407. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1408. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1409. a = tolower(* (const unsigned char *) (src + i + 1));
  1410. b = tolower(* (const unsigned char *) (src + i + 2));
  1411. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1412. i += 2;
  1413. } else if (is_form_url_encoded && src[i] == '+') {
  1414. dst[j] = ' ';
  1415. } else {
  1416. dst[j] = src[i];
  1417. }
  1418. }
  1419. dst[j] = '\0'; // Null-terminate the destination
  1420. return i >= src_len ? j : -1;
  1421. }
  1422. int mg_get_var(const char *data, size_t data_len, const char *name,
  1423. char *dst, size_t dst_len) {
  1424. const char *p, *e, *s;
  1425. size_t name_len;
  1426. int len;
  1427. if (dst == NULL || dst_len == 0) {
  1428. len = -2;
  1429. } else if (data == NULL || name == NULL || data_len == 0) {
  1430. len = -1;
  1431. dst[0] = '\0';
  1432. } else {
  1433. name_len = strlen(name);
  1434. e = data + data_len;
  1435. len = -1;
  1436. dst[0] = '\0';
  1437. // data is "var1=val1&var2=val2...". Find variable first
  1438. for (p = data; p + name_len < e; p++) {
  1439. if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
  1440. !mg_strncasecmp(name, p, name_len)) {
  1441. // Point p to variable value
  1442. p += name_len + 1;
  1443. // Point s to the end of the value
  1444. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1445. if (s == NULL) {
  1446. s = e;
  1447. }
  1448. assert(s >= p);
  1449. // Decode variable into destination buffer
  1450. len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1451. // Redirect error code from -1 to -2 (destination buffer too small).
  1452. if (len == -1) {
  1453. len = -2;
  1454. }
  1455. break;
  1456. }
  1457. }
  1458. }
  1459. return len;
  1460. }
  1461. int mg_get_cookie(const char *cookie_header, const char *var_name,
  1462. char *dst, size_t dst_size) {
  1463. const char *s, *p, *end;
  1464. int name_len, len = -1;
  1465. if (dst == NULL || dst_size == 0) {
  1466. len = -2;
  1467. } else if (var_name == NULL || (s = cookie_header) == NULL) {
  1468. len = -1;
  1469. dst[0] = '\0';
  1470. } else {
  1471. name_len = (int) strlen(var_name);
  1472. end = s + strlen(s);
  1473. dst[0] = '\0';
  1474. for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
  1475. if (s[name_len] == '=') {
  1476. s += name_len + 1;
  1477. if ((p = strchr(s, ' ')) == NULL)
  1478. p = end;
  1479. if (p[-1] == ';')
  1480. p--;
  1481. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1482. s++;
  1483. p--;
  1484. }
  1485. if ((size_t) (p - s) < dst_size) {
  1486. len = p - s;
  1487. mg_strlcpy(dst, s, (size_t) len + 1);
  1488. } else {
  1489. len = -3;
  1490. }
  1491. break;
  1492. }
  1493. }
  1494. }
  1495. return len;
  1496. }
  1497. static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1498. size_t buf_len, struct file *filep) {
  1499. struct vec a, b;
  1500. const char *rewrite, *uri = conn->request_info.uri;
  1501. char *p;
  1502. int match_len;
  1503. // Using buf_len - 1 because memmove() for PATH_INFO may shift part
  1504. // of the path one byte on the right.
  1505. mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
  1506. uri);
  1507. rewrite = conn->ctx->config[REWRITE];
  1508. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1509. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1510. mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
  1511. uri + match_len);
  1512. break;
  1513. }
  1514. }
  1515. if (!mg_stat(conn, buf, filep)) {
  1516. // Support PATH_INFO for CGI scripts.
  1517. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1518. if (*p == '/') {
  1519. *p = '\0';
  1520. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1521. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1522. mg_stat(conn, buf, filep)) {
  1523. // Shift PATH_INFO block one character right, e.g.
  1524. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1525. // conn->path_info is pointing to the local variable "path" declared
  1526. // in handle_request(), so PATH_INFO is not valid after
  1527. // handle_request returns.
  1528. conn->path_info = p + 1;
  1529. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1530. p[1] = '/';
  1531. break;
  1532. } else {
  1533. *p = '/';
  1534. }
  1535. }
  1536. }
  1537. }
  1538. }
  1539. // Check whether full request is buffered. Return:
  1540. // -1 if request is malformed
  1541. // 0 if request is not yet fully buffered
  1542. // >0 actual request length, including last \r\n\r\n
  1543. static int get_request_len(const char *buf, int buflen) {
  1544. const char *s, *e;
  1545. int len = 0;
  1546. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1547. // Control characters are not allowed but >=128 is.
  1548. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1549. *s != '\n' && * (const unsigned char *) s < 128) {
  1550. len = -1;
  1551. break; // [i_a] abort scan as soon as one malformed character is found;
  1552. // don't let subsequent \r\n\r\n win us over anyhow
  1553. } else if (s[0] == '\n' && s[1] == '\n') {
  1554. len = (int) (s - buf) + 2;
  1555. } else if (s[0] == '\n' && &s[1] < e &&
  1556. s[1] == '\r' && s[2] == '\n') {
  1557. len = (int) (s - buf) + 3;
  1558. }
  1559. return len;
  1560. }
  1561. // Convert month to the month number. Return -1 on error, or month number
  1562. static int get_month_index(const char *s) {
  1563. size_t i;
  1564. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1565. if (!strcmp(s, month_names[i]))
  1566. return (int) i;
  1567. return -1;
  1568. }
  1569. static int num_leap_years(int year) {
  1570. return year / 4 - year / 100 + year / 400;
  1571. }
  1572. // Parse UTC date-time string, and return the corresponding time_t value.
  1573. static time_t parse_date_string(const char *datetime) {
  1574. static const unsigned short days_before_month[] = {
  1575. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1576. };
  1577. char month_str[32];
  1578. int second, minute, hour, day, month, year, leap_days, days;
  1579. time_t result = (time_t) 0;
  1580. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1581. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1582. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1583. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1584. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1585. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1586. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1587. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1588. year > 1970 &&
  1589. (month = get_month_index(month_str)) != -1) {
  1590. leap_days = num_leap_years(year) - num_leap_years(1970);
  1591. year -= 1970;
  1592. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1593. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1594. }
  1595. return result;
  1596. }
  1597. // Protect against directory disclosure attack by removing '..',
  1598. // excessive '/' and '\' characters
  1599. static void remove_double_dots_and_double_slashes(char *s) {
  1600. char *p = s;
  1601. while (*s != '\0') {
  1602. *p++ = *s++;
  1603. if (s[-1] == '/' || s[-1] == '\\') {
  1604. // Skip all following slashes, backslashes and double-dots
  1605. while (s[0] != '\0') {
  1606. if (s[0] == '/' || s[0] == '\\') {
  1607. s++;
  1608. } else if (s[0] == '.' && s[1] == '.') {
  1609. s += 2;
  1610. } else {
  1611. break;
  1612. }
  1613. }
  1614. }
  1615. }
  1616. *p = '\0';
  1617. }
  1618. static const struct {
  1619. const char *extension;
  1620. size_t ext_len;
  1621. const char *mime_type;
  1622. } builtin_mime_types[] = {
  1623. {".html", 5, "text/html"},
  1624. {".htm", 4, "text/html"},
  1625. {".shtm", 5, "text/html"},
  1626. {".shtml", 6, "text/html"},
  1627. {".css", 4, "text/css"},
  1628. {".js", 3, "application/x-javascript"},
  1629. {".ico", 4, "image/x-icon"},
  1630. {".gif", 4, "image/gif"},
  1631. {".jpg", 4, "image/jpeg"},
  1632. {".jpeg", 5, "image/jpeg"},
  1633. {".png", 4, "image/png"},
  1634. {".svg", 4, "image/svg+xml"},
  1635. {".txt", 4, "text/plain"},
  1636. {".torrent", 8, "application/x-bittorrent"},
  1637. {".wav", 4, "audio/x-wav"},
  1638. {".mp3", 4, "audio/x-mp3"},
  1639. {".mid", 4, "audio/mid"},
  1640. {".m3u", 4, "audio/x-mpegurl"},
  1641. {".ogg", 4, "audio/ogg"},
  1642. {".ram", 4, "audio/x-pn-realaudio"},
  1643. {".xml", 4, "text/xml"},
  1644. {".json", 5, "text/json"},
  1645. {".xslt", 5, "application/xml"},
  1646. {".xsl", 4, "application/xml"},
  1647. {".ra", 3, "audio/x-pn-realaudio"},
  1648. {".doc", 4, "application/msword"},
  1649. {".exe", 4, "application/octet-stream"},
  1650. {".zip", 4, "application/x-zip-compressed"},
  1651. {".xls", 4, "application/excel"},
  1652. {".tgz", 4, "application/x-tar-gz"},
  1653. {".tar", 4, "application/x-tar"},
  1654. {".gz", 3, "application/x-gunzip"},
  1655. {".arj", 4, "application/x-arj-compressed"},
  1656. {".rar", 4, "application/x-arj-compressed"},
  1657. {".rtf", 4, "application/rtf"},
  1658. {".pdf", 4, "application/pdf"},
  1659. {".swf", 4, "application/x-shockwave-flash"},
  1660. {".mpg", 4, "video/mpeg"},
  1661. {".webm", 5, "video/webm"},
  1662. {".mpeg", 5, "video/mpeg"},
  1663. {".mp4", 4, "video/mp4"},
  1664. {".m4v", 4, "video/x-m4v"},
  1665. {".asf", 4, "video/x-ms-asf"},
  1666. {".avi", 4, "video/x-msvideo"},
  1667. {".bmp", 4, "image/bmp"},
  1668. {NULL, 0, NULL}
  1669. };
  1670. const char *mg_get_builtin_mime_type(const char *path) {
  1671. const char *ext;
  1672. size_t i, path_len;
  1673. path_len = strlen(path);
  1674. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1675. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1676. if (path_len > builtin_mime_types[i].ext_len &&
  1677. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1678. return builtin_mime_types[i].mime_type;
  1679. }
  1680. }
  1681. return "text/plain";
  1682. }
  1683. // Look at the "path" extension and figure what mime type it has.
  1684. // Store mime type in the vector.
  1685. static void get_mime_type(struct mg_context *ctx, const char *path,
  1686. struct vec *vec) {
  1687. struct vec ext_vec, mime_vec;
  1688. const char *list, *ext;
  1689. size_t path_len;
  1690. path_len = strlen(path);
  1691. // Scan user-defined mime types first, in case user wants to
  1692. // override default mime types.
  1693. list = ctx->config[EXTRA_MIME_TYPES];
  1694. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1695. // ext now points to the path suffix
  1696. ext = path + path_len - ext_vec.len;
  1697. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1698. *vec = mime_vec;
  1699. return;
  1700. }
  1701. }
  1702. vec->ptr = mg_get_builtin_mime_type(path);
  1703. vec->len = strlen(vec->ptr);
  1704. }
  1705. static int is_big_endian(void) {
  1706. static const int n = 1;
  1707. return ((char *) &n)[0] == 0;
  1708. }
  1709. #ifndef HAVE_MD5
  1710. typedef struct MD5Context {
  1711. uint32_t buf[4];
  1712. uint32_t bits[2];
  1713. unsigned char in[64];
  1714. } MD5_CTX;
  1715. static void byteReverse(unsigned char *buf, unsigned longs) {
  1716. uint32_t t;
  1717. // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
  1718. if (is_big_endian()) {
  1719. do {
  1720. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1721. ((unsigned) buf[1] << 8 | buf[0]);
  1722. * (uint32_t *) buf = t;
  1723. buf += 4;
  1724. } while (--longs);
  1725. }
  1726. }
  1727. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1728. #define F2(x, y, z) F1(z, x, y)
  1729. #define F3(x, y, z) (x ^ y ^ z)
  1730. #define F4(x, y, z) (y ^ (x | ~z))
  1731. #define MD5STEP(f, w, x, y, z, data, s) \
  1732. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1733. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1734. // initialization constants.
  1735. static void MD5Init(MD5_CTX *ctx) {
  1736. ctx->buf[0] = 0x67452301;
  1737. ctx->buf[1] = 0xefcdab89;
  1738. ctx->buf[2] = 0x98badcfe;
  1739. ctx->buf[3] = 0x10325476;
  1740. ctx->bits[0] = 0;
  1741. ctx->bits[1] = 0;
  1742. }
  1743. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1744. register uint32_t a, b, c, d;
  1745. a = buf[0];
  1746. b = buf[1];
  1747. c = buf[2];
  1748. d = buf[3];
  1749. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1750. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1751. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1752. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1753. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1754. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1755. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1756. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1757. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1758. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1759. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1760. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1761. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1762. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1763. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1764. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1765. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1766. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1767. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1768. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1769. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1770. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1771. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1772. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1773. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1774. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1775. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1776. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1777. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1778. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1779. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1780. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1781. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1782. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1783. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1784. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1785. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1786. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1787. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1788. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1789. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1790. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1791. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1792. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1793. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1794. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1795. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1796. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1797. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1798. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1799. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1800. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1801. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1802. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1803. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1804. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1805. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1806. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1807. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1808. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1809. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1810. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1811. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1812. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1813. buf[0] += a;
  1814. buf[1] += b;
  1815. buf[2] += c;
  1816. buf[3] += d;
  1817. }
  1818. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1819. uint32_t t;
  1820. t = ctx->bits[0];
  1821. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1822. ctx->bits[1]++;
  1823. ctx->bits[1] += len >> 29;
  1824. t = (t >> 3) & 0x3f;
  1825. if (t) {
  1826. unsigned char *p = (unsigned char *) ctx->in + t;
  1827. t = 64 - t;
  1828. if (len < t) {
  1829. memcpy(p, buf, len);
  1830. return;
  1831. }
  1832. memcpy(p, buf, t);
  1833. byteReverse(ctx->in, 16);
  1834. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1835. buf += t;
  1836. len -= t;
  1837. }
  1838. while (len >= 64) {
  1839. memcpy(ctx->in, buf, 64);
  1840. byteReverse(ctx->in, 16);
  1841. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1842. buf += 64;
  1843. len -= 64;
  1844. }
  1845. memcpy(ctx->in, buf, len);
  1846. }
  1847. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1848. unsigned count;
  1849. unsigned char *p;
  1850. uint32_t *a;
  1851. count = (ctx->bits[0] >> 3) & 0x3F;
  1852. p = ctx->in + count;
  1853. *p++ = 0x80;
  1854. count = 64 - 1 - count;
  1855. if (count < 8) {
  1856. memset(p, 0, count);
  1857. byteReverse(ctx->in, 16);
  1858. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1859. memset(ctx->in, 0, 56);
  1860. } else {
  1861. memset(p, 0, count - 8);
  1862. }
  1863. byteReverse(ctx->in, 14);
  1864. a = (uint32_t *)ctx->in;
  1865. a[14] = ctx->bits[0];
  1866. a[15] = ctx->bits[1];
  1867. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1868. byteReverse((unsigned char *) ctx->buf, 4);
  1869. memcpy(digest, ctx->buf, 16);
  1870. memset((char *) ctx, 0, sizeof(*ctx));
  1871. }
  1872. #endif // !HAVE_MD5
  1873. // Stringify binary data. Output buffer must be twice as big as input,
  1874. // because each byte takes 2 bytes in string representation
  1875. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1876. static const char *hex = "0123456789abcdef";
  1877. for (; len--; p++) {
  1878. *to++ = hex[p[0] >> 4];
  1879. *to++ = hex[p[0] & 0x0f];
  1880. }
  1881. *to = '\0';
  1882. }
  1883. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1884. char *mg_md5(char buf[33], ...) {
  1885. unsigned char hash[16];
  1886. const char *p;
  1887. va_list ap;
  1888. MD5_CTX ctx;
  1889. MD5Init(&ctx);
  1890. va_start(ap, buf);
  1891. while ((p = va_arg(ap, const char *)) != NULL) {
  1892. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1893. }
  1894. va_end(ap);
  1895. MD5Final(hash, &ctx);
  1896. bin2str(buf, hash, sizeof(hash));
  1897. return buf;
  1898. }
  1899. // Check the user's password, return 1 if OK
  1900. static int check_password(const char *method, const char *ha1, const char *uri,
  1901. const char *nonce, const char *nc, const char *cnonce,
  1902. const char *qop, const char *response) {
  1903. char ha2[32 + 1], expected_response[32 + 1];
  1904. // Some of the parameters may be NULL
  1905. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1906. qop == NULL || response == NULL) {
  1907. return 0;
  1908. }
  1909. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1910. // TODO(lsm): check for authentication timeout
  1911. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1912. strlen(response) != 32
  1913. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1914. ) {
  1915. return 0;
  1916. }
  1917. mg_md5(ha2, method, ":", uri, NULL);
  1918. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1919. ":", cnonce, ":", qop, ":", ha2, NULL);
  1920. return mg_strcasecmp(response, expected_response) == 0;
  1921. }
  1922. // Use the global passwords file, if specified by auth_gpass option,
  1923. // or search for .htpasswd in the requested directory.
  1924. static void open_auth_file(struct mg_connection *conn, const char *path,
  1925. struct file *filep) {
  1926. char name[PATH_MAX];
  1927. const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
  1928. if (gpass != NULL) {
  1929. // Use global passwords file
  1930. if (!mg_fopen(conn, gpass, "r", filep)) {
  1931. cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
  1932. }
  1933. } else if (mg_stat(conn, path, filep) && filep->is_directory) {
  1934. mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1935. path, '/', PASSWORDS_FILE_NAME);
  1936. mg_fopen(conn, name, "r", filep);
  1937. } else {
  1938. // Try to find .htpasswd in requested directory.
  1939. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1940. if (e[0] == '/')
  1941. break;
  1942. mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1943. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  1944. mg_fopen(conn, name, "r", filep);
  1945. }
  1946. }
  1947. // Parsed Authorization header
  1948. struct ah {
  1949. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1950. };
  1951. // Return 1 on success. Always initializes the ah structure.
  1952. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1953. size_t buf_size, struct ah *ah) {
  1954. char *name, *value, *s;
  1955. const char *auth_header;
  1956. (void) memset(ah, 0, sizeof(*ah));
  1957. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  1958. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  1959. return 0;
  1960. }
  1961. // Make modifiable copy of the auth header
  1962. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  1963. s = buf;
  1964. // Parse authorization header
  1965. for (;;) {
  1966. // Gobble initial spaces
  1967. while (isspace(* (unsigned char *) s)) {
  1968. s++;
  1969. }
  1970. name = skip_quoted(&s, "=", " ", 0);
  1971. // Value is either quote-delimited, or ends at first comma or space.
  1972. if (s[0] == '\"') {
  1973. s++;
  1974. value = skip_quoted(&s, "\"", " ", '\\');
  1975. if (s[0] == ',') {
  1976. s++;
  1977. }
  1978. } else {
  1979. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  1980. }
  1981. if (*name == '\0') {
  1982. break;
  1983. }
  1984. if (!strcmp(name, "username")) {
  1985. ah->user = value;
  1986. } else if (!strcmp(name, "cnonce")) {
  1987. ah->cnonce = value;
  1988. } else if (!strcmp(name, "response")) {
  1989. ah->response = value;
  1990. } else if (!strcmp(name, "uri")) {
  1991. ah->uri = value;
  1992. } else if (!strcmp(name, "qop")) {
  1993. ah->qop = value;
  1994. } else if (!strcmp(name, "nc")) {
  1995. ah->nc = value;
  1996. } else if (!strcmp(name, "nonce")) {
  1997. ah->nonce = value;
  1998. }
  1999. }
  2000. // CGI needs it as REMOTE_USER
  2001. if (ah->user != NULL) {
  2002. conn->request_info.remote_user = mg_strdup(ah->user);
  2003. } else {
  2004. return 0;
  2005. }
  2006. return 1;
  2007. }
  2008. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
  2009. char *eof;
  2010. size_t len;
  2011. if (filep->membuf != NULL && *p != NULL) {
  2012. eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
  2013. len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
  2014. memcpy(buf, *p, len);
  2015. buf[len] = '\0';
  2016. *p = eof;
  2017. return eof;
  2018. } else if (filep->fp != NULL) {
  2019. return fgets(buf, size, filep->fp);
  2020. } else {
  2021. return NULL;
  2022. }
  2023. }
  2024. // Authorize against the opened passwords file. Return 1 if authorized.
  2025. static int authorize(struct mg_connection *conn, struct file *filep) {
  2026. struct ah ah;
  2027. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
  2028. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  2029. return 0;
  2030. }
  2031. // Loop over passwords file
  2032. p = (char *) filep->membuf;
  2033. while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
  2034. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  2035. continue;
  2036. }
  2037. if (!strcmp(ah.user, f_user) &&
  2038. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  2039. return check_password(conn->request_info.request_method, ha1, ah.uri,
  2040. ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
  2041. }
  2042. return 0;
  2043. }
  2044. // Return 1 if request is authorised, 0 otherwise.
  2045. static int check_authorization(struct mg_connection *conn, const char *path) {
  2046. char fname[PATH_MAX];
  2047. struct vec uri_vec, filename_vec;
  2048. const char *list;
  2049. struct file file = STRUCT_FILE_INITIALIZER;
  2050. int authorized = 1;
  2051. list = conn->ctx->config[PROTECT_URI];
  2052. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  2053. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  2054. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2055. (int) filename_vec.len, filename_vec.ptr);
  2056. if (!mg_fopen(conn, fname, "r", &file)) {
  2057. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2058. }
  2059. break;
  2060. }
  2061. }
  2062. if (!is_file_opened(&file)) {
  2063. open_auth_file(conn, path, &file);
  2064. }
  2065. if (is_file_opened(&file)) {
  2066. authorized = authorize(conn, &file);
  2067. mg_fclose(&file);
  2068. }
  2069. return authorized;
  2070. }
  2071. static void send_authorization_request(struct mg_connection *conn) {
  2072. conn->status_code = 401;
  2073. mg_printf(conn,
  2074. "HTTP/1.1 401 Unauthorized\r\n"
  2075. "Content-Length: 0\r\n"
  2076. "WWW-Authenticate: Digest qop=\"auth\", "
  2077. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2078. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2079. (unsigned long) time(NULL));
  2080. }
  2081. static int is_authorized_for_put(struct mg_connection *conn) {
  2082. struct file file = STRUCT_FILE_INITIALIZER;
  2083. const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
  2084. int ret = 0;
  2085. if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
  2086. ret = authorize(conn, &file);
  2087. mg_fclose(&file);
  2088. }
  2089. return ret;
  2090. }
  2091. int mg_modify_passwords_file(const char *fname, const char *domain,
  2092. const char *user, const char *pass) {
  2093. int found;
  2094. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2095. FILE *fp, *fp2;
  2096. found = 0;
  2097. fp = fp2 = NULL;
  2098. // Regard empty password as no password - remove user record.
  2099. if (pass != NULL && pass[0] == '\0') {
  2100. pass = NULL;
  2101. }
  2102. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2103. // Create the file if does not exist
  2104. if ((fp = fopen(fname, "a+")) != NULL) {
  2105. (void) fclose(fp);
  2106. }
  2107. // Open the given file and temporary file
  2108. if ((fp = fopen(fname, "r")) == NULL) {
  2109. return 0;
  2110. } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
  2111. fclose(fp);
  2112. return 0;
  2113. }
  2114. // Copy the stuff to temporary file
  2115. while (fgets(line, sizeof(line), fp) != NULL) {
  2116. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2117. continue;
  2118. }
  2119. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2120. found++;
  2121. if (pass != NULL) {
  2122. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2123. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2124. }
  2125. } else {
  2126. fprintf(fp2, "%s", line);
  2127. }
  2128. }
  2129. // If new user, just add it
  2130. if (!found && pass != NULL) {
  2131. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2132. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2133. }
  2134. // Close files
  2135. fclose(fp);
  2136. fclose(fp2);
  2137. // Put the temp file in place of real file
  2138. remove(fname);
  2139. rename(tmp, fname);
  2140. return 1;
  2141. }
  2142. struct de {
  2143. struct mg_connection *conn;
  2144. char *file_name;
  2145. struct file file;
  2146. };
  2147. static void url_encode(const char *src, char *dst, size_t dst_len) {
  2148. static const char *dont_escape = "._-$,;~()";
  2149. static const char *hex = "0123456789abcdef";
  2150. const char *end = dst + dst_len - 1;
  2151. for (; *src != '\0' && dst < end; src++, dst++) {
  2152. if (isalnum(*(const unsigned char *) src) ||
  2153. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2154. *dst = *src;
  2155. } else if (dst + 2 < end) {
  2156. dst[0] = '%';
  2157. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2158. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2159. dst += 2;
  2160. }
  2161. }
  2162. *dst = '\0';
  2163. }
  2164. static void print_dir_entry(struct de *de) {
  2165. char size[64], mod[64], href[PATH_MAX];
  2166. if (de->file.is_directory) {
  2167. mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2168. } else {
  2169. // We use (signed) cast below because MSVC 6 compiler cannot
  2170. // convert unsigned __int64 to double. Sigh.
  2171. if (de->file.size < 1024) {
  2172. mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
  2173. } else if (de->file.size < 0x100000) {
  2174. mg_snprintf(de->conn, size, sizeof(size),
  2175. "%.1fk", (double) de->file.size / 1024.0);
  2176. } else if (de->file.size < 0x40000000) {
  2177. mg_snprintf(de->conn, size, sizeof(size),
  2178. "%.1fM", (double) de->file.size / 1048576);
  2179. } else {
  2180. mg_snprintf(de->conn, size, sizeof(size),
  2181. "%.1fG", (double) de->file.size / 1073741824);
  2182. }
  2183. }
  2184. strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
  2185. localtime(&de->file.modification_time));
  2186. url_encode(de->file_name, href, sizeof(href));
  2187. de->conn->num_bytes_sent += mg_printf(de->conn,
  2188. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2189. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2190. de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
  2191. de->file_name, de->file.is_directory ? "/" : "", mod, size);
  2192. }
  2193. // This function is called from send_directory() and used for
  2194. // sorting directory entries by size, or name, or modification time.
  2195. // On windows, __cdecl specification is needed in case if project is built
  2196. // with __stdcall convention. qsort always requires __cdels callback.
  2197. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2198. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2199. const char *query_string = a->conn->request_info.query_string;
  2200. int cmp_result = 0;
  2201. if (query_string == NULL) {
  2202. query_string = "na";
  2203. }
  2204. if (a->file.is_directory && !b->file.is_directory) {
  2205. return -1; // Always put directories on top
  2206. } else if (!a->file.is_directory && b->file.is_directory) {
  2207. return 1; // Always put directories on top
  2208. } else if (*query_string == 'n') {
  2209. cmp_result = strcmp(a->file_name, b->file_name);
  2210. } else if (*query_string == 's') {
  2211. cmp_result = a->file.size == b->file.size ? 0 :
  2212. a->file.size > b->file.size ? 1 : -1;
  2213. } else if (*query_string == 'd') {
  2214. cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
  2215. a->file.modification_time > b->file.modification_time ? 1 : -1;
  2216. }
  2217. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2218. }
  2219. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2220. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2221. const char *pattern = conn->ctx->config[HIDE_FILES];
  2222. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2223. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2224. }
  2225. static int scan_directory(struct mg_connection *conn, const char *dir,
  2226. void *data, void (*cb)(struct de *, void *)) {
  2227. char path[PATH_MAX];
  2228. struct dirent *dp;
  2229. DIR *dirp;
  2230. struct de de;
  2231. if ((dirp = opendir(dir)) == NULL) {
  2232. return 0;
  2233. } else {
  2234. de.conn = conn;
  2235. while ((dp = readdir(dirp)) != NULL) {
  2236. // Do not show current dir and hidden files
  2237. if (!strcmp(dp->d_name, ".") ||
  2238. !strcmp(dp->d_name, "..") ||
  2239. must_hide_file(conn, dp->d_name)) {
  2240. continue;
  2241. }
  2242. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2243. // If we don't memset stat structure to zero, mtime will have
  2244. // garbage and strftime() will segfault later on in
  2245. // print_dir_entry(). memset is required only if mg_stat()
  2246. // fails. For more details, see
  2247. // http://code.google.com/p/mongoose/issues/detail?id=79
  2248. memset(&de.file, 0, sizeof(de.file));
  2249. mg_stat(conn, path, &de.file);
  2250. de.file_name = dp->d_name;
  2251. cb(&de, data);
  2252. }
  2253. (void) closedir(dirp);
  2254. }
  2255. return 1;
  2256. }
  2257. struct dir_scan_data {
  2258. struct de *entries;
  2259. int num_entries;
  2260. int arr_size;
  2261. };
  2262. static void dir_scan_callback(struct de *de, void *data) {
  2263. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2264. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2265. dsd->arr_size *= 2;
  2266. dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
  2267. sizeof(dsd->entries[0]));
  2268. }
  2269. if (dsd->entries == NULL) {
  2270. // TODO(lsm): propagate an error to the caller
  2271. dsd->num_entries = 0;
  2272. } else {
  2273. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2274. dsd->entries[dsd->num_entries].file = de->file;
  2275. dsd->entries[dsd->num_entries].conn = de->conn;
  2276. dsd->num_entries++;
  2277. }
  2278. }
  2279. static void handle_directory_request(struct mg_connection *conn,
  2280. const char *dir) {
  2281. int i, sort_direction;
  2282. struct dir_scan_data data = { NULL, 0, 128 };
  2283. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2284. send_http_error(conn, 500, "Cannot open directory",
  2285. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2286. return;
  2287. }
  2288. sort_direction = conn->request_info.query_string != NULL &&
  2289. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2290. conn->must_close = 1;
  2291. mg_printf(conn, "%s",
  2292. "HTTP/1.1 200 OK\r\n"
  2293. "Connection: close\r\n"
  2294. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2295. conn->num_bytes_sent += mg_printf(conn,
  2296. "<html><head><title>Index of %s</title>"
  2297. "<style>th {text-align: left;}</style></head>"
  2298. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2299. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2300. "<th><a href=\"?d%c\">Modified</a></th>"
  2301. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2302. "<tr><td colspan=\"3\"><hr></td></tr>",
  2303. conn->request_info.uri, conn->request_info.uri,
  2304. sort_direction, sort_direction, sort_direction);
  2305. // Print first entry - link to a parent directory
  2306. conn->num_bytes_sent += mg_printf(conn,
  2307. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2308. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2309. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2310. // Sort and print directory entries
  2311. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2312. compare_dir_entries);
  2313. for (i = 0; i < data.num_entries; i++) {
  2314. print_dir_entry(&data.entries[i]);
  2315. free(data.entries[i].file_name);
  2316. }
  2317. free(data.entries);
  2318. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2319. conn->status_code = 200;
  2320. }
  2321. // Send len bytes from the opened file to the client.
  2322. static void send_file_data(struct mg_connection *conn, struct file *filep,
  2323. int64_t offset, int64_t len) {
  2324. char buf[MG_BUF_LEN];
  2325. int to_read, num_read, num_written;
  2326. if (len > 0 && filep->membuf != NULL && filep->size > 0) {
  2327. if (len > filep->size - offset) {
  2328. len = filep->size - offset;
  2329. }
  2330. mg_write(conn, filep->membuf + offset, (size_t) len);
  2331. } else if (len > 0 && filep->fp != NULL) {
  2332. fseeko(filep->fp, offset, SEEK_SET);
  2333. while (len > 0) {
  2334. // Calculate how much to read from the file in the buffer
  2335. to_read = sizeof(buf);
  2336. if ((int64_t) to_read > len) {
  2337. to_read = (int) len;
  2338. }
  2339. // Read from file, exit the loop on error
  2340. if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
  2341. break;
  2342. }
  2343. // Send read bytes to the client, exit the loop on error
  2344. if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
  2345. break;
  2346. }
  2347. // Both read and were successful, adjust counters
  2348. conn->num_bytes_sent += num_written;
  2349. len -= num_written;
  2350. }
  2351. }
  2352. }
  2353. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2354. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2355. }
  2356. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2357. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2358. }
  2359. static void construct_etag(char *buf, size_t buf_len,
  2360. const struct file *filep) {
  2361. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2362. (unsigned long) filep->modification_time, filep->size);
  2363. }
  2364. static void fclose_on_exec(struct file *filep) {
  2365. if (filep != NULL && filep->fp != NULL) {
  2366. #ifndef _WIN32
  2367. fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
  2368. #endif
  2369. }
  2370. }
  2371. static void handle_file_request(struct mg_connection *conn, const char *path,
  2372. struct file *filep) {
  2373. char date[64], lm[64], etag[64], range[64];
  2374. const char *msg = "OK", *hdr;
  2375. time_t curtime = time(NULL);
  2376. int64_t cl, r1, r2;
  2377. struct vec mime_vec;
  2378. int n;
  2379. get_mime_type(conn->ctx, path, &mime_vec);
  2380. cl = filep->size;
  2381. conn->status_code = 200;
  2382. range[0] = '\0';
  2383. if (!mg_fopen(conn, path, "rb", filep)) {
  2384. send_http_error(conn, 500, http_500_error,
  2385. "fopen(%s): %s", path, strerror(ERRNO));
  2386. return;
  2387. }
  2388. fclose_on_exec(filep);
  2389. // If Range: header specified, act accordingly
  2390. r1 = r2 = 0;
  2391. hdr = mg_get_header(conn, "Range");
  2392. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
  2393. r1 >= 0 && r2 >= 0) {
  2394. conn->status_code = 206;
  2395. cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
  2396. mg_snprintf(conn, range, sizeof(range),
  2397. "Content-Range: bytes "
  2398. "%" INT64_FMT "-%"
  2399. INT64_FMT "/%" INT64_FMT "\r\n",
  2400. r1, r1 + cl - 1, filep->size);
  2401. msg = "Partial Content";
  2402. }
  2403. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2404. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2405. gmt_time_string(date, sizeof(date), &curtime);
  2406. gmt_time_string(lm, sizeof(lm), &filep->modification_time);
  2407. construct_etag(etag, sizeof(etag), filep);
  2408. (void) mg_printf(conn,
  2409. "HTTP/1.1 %d %s\r\n"
  2410. "Date: %s\r\n"
  2411. "Last-Modified: %s\r\n"
  2412. "Etag: %s\r\n"
  2413. "Content-Type: %.*s\r\n"
  2414. "Content-Length: %" INT64_FMT "\r\n"
  2415. "Connection: %s\r\n"
  2416. "Accept-Ranges: bytes\r\n"
  2417. "%s\r\n",
  2418. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2419. mime_vec.ptr, cl, suggest_connection_header(conn), range);
  2420. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2421. send_file_data(conn, filep, r1, cl);
  2422. }
  2423. mg_fclose(filep);
  2424. }
  2425. void mg_send_file(struct mg_connection *conn, const char *path) {
  2426. struct file file = STRUCT_FILE_INITIALIZER;
  2427. if (mg_stat(conn, path, &file)) {
  2428. handle_file_request(conn, path, &file);
  2429. } else {
  2430. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2431. }
  2432. }
  2433. // Parse HTTP headers from the given buffer, advance buffer to the point
  2434. // where parsing stopped.
  2435. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2436. int i;
  2437. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2438. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2439. ri->http_headers[i].value = skip(buf, "\r\n");
  2440. if (ri->http_headers[i].name[0] == '\0')
  2441. break;
  2442. ri->num_headers = i + 1;
  2443. }
  2444. }
  2445. static int is_valid_http_method(const char *method) {
  2446. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2447. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2448. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2449. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
  2450. }
  2451. // Parse HTTP request, fill in mg_request_info structure.
  2452. // This function modifies the buffer by NUL-terminating
  2453. // HTTP request components, header names and header values.
  2454. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2455. int is_request, request_length = get_request_len(buf, len);
  2456. if (request_length > 0) {
  2457. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2458. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2459. ri->num_headers = 0;
  2460. buf[request_length - 1] = '\0';
  2461. // RFC says that all initial whitespaces should be ingored
  2462. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2463. buf++;
  2464. }
  2465. ri->request_method = skip(&buf, " ");
  2466. ri->uri = skip(&buf, " ");
  2467. ri->http_version = skip(&buf, "\r\n");
  2468. if (((is_request = is_valid_http_method(ri->request_method)) &&
  2469. memcmp(ri->http_version, "HTTP/", 5) != 0) ||
  2470. (!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {
  2471. request_length = -1;
  2472. } else {
  2473. if (is_request) {
  2474. ri->http_version += 5;
  2475. }
  2476. parse_http_headers(&buf, ri);
  2477. }
  2478. }
  2479. return request_length;
  2480. }
  2481. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2482. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2483. // buffer (which marks the end of HTTP request). Buffer buf may already
  2484. // have some data. The length of the data is stored in nread.
  2485. // Upon every read operation, increase nread by the number of bytes read.
  2486. static int read_request(FILE *fp, struct mg_connection *conn,
  2487. char *buf, int bufsiz, int *nread) {
  2488. int request_len, n = 0;
  2489. request_len = get_request_len(buf, *nread);
  2490. while (*nread < bufsiz && request_len == 0 &&
  2491. (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
  2492. *nread += n;
  2493. assert(*nread <= bufsiz);
  2494. request_len = get_request_len(buf, *nread);
  2495. }
  2496. return request_len <= 0 && n <= 0 ? -1 : request_len;
  2497. }
  2498. // For given directory path, substitute it to valid index file.
  2499. // Return 0 if index file has been found, -1 if not found.
  2500. // If the file is found, it's stats is returned in stp.
  2501. static int substitute_index_file(struct mg_connection *conn, char *path,
  2502. size_t path_len, struct file *filep) {
  2503. const char *list = conn->ctx->config[INDEX_FILES];
  2504. struct file file = STRUCT_FILE_INITIALIZER;
  2505. struct vec filename_vec;
  2506. size_t n = strlen(path);
  2507. int found = 0;
  2508. // The 'path' given to us points to the directory. Remove all trailing
  2509. // directory separator characters from the end of the path, and
  2510. // then append single directory separator character.
  2511. while (n > 0 && path[n - 1] == '/') {
  2512. n--;
  2513. }
  2514. path[n] = '/';
  2515. // Traverse index files list. For each entry, append it to the given
  2516. // path and see if the file exists. If it exists, break the loop
  2517. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2518. // Ignore too long entries that may overflow path buffer
  2519. if (filename_vec.len > path_len - (n + 2))
  2520. continue;
  2521. // Prepare full path to the index file
  2522. mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2523. // Does it exist?
  2524. if (mg_stat(conn, path, &file)) {
  2525. // Yes it does, break the loop
  2526. *filep = file;
  2527. found = 1;
  2528. break;
  2529. }
  2530. }
  2531. // If no index file exists, restore directory path
  2532. if (!found) {
  2533. path[n] = '\0';
  2534. }
  2535. return found;
  2536. }
  2537. // Return True if we should reply 304 Not Modified.
  2538. static int is_not_modified(const struct mg_connection *conn,
  2539. const struct file *filep) {
  2540. char etag[64];
  2541. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2542. const char *inm = mg_get_header(conn, "If-None-Match");
  2543. construct_etag(etag, sizeof(etag), filep);
  2544. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2545. (ims != NULL && filep->modification_time <= parse_date_string(ims));
  2546. }
  2547. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2548. SOCKET sock, SSL *ssl) {
  2549. const char *expect, *body;
  2550. char buf[MG_BUF_LEN];
  2551. int to_read, nread, buffered_len, success = 0;
  2552. expect = mg_get_header(conn, "Expect");
  2553. assert(fp != NULL);
  2554. if (conn->content_len == -1) {
  2555. send_http_error(conn, 411, "Length Required", "%s", "");
  2556. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2557. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2558. } else {
  2559. if (expect != NULL) {
  2560. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2561. }
  2562. body = conn->buf + conn->request_len + conn->consumed_content;
  2563. buffered_len = &conn->buf[conn->data_len] - body;
  2564. assert(buffered_len >= 0);
  2565. assert(conn->consumed_content == 0);
  2566. if (buffered_len > 0) {
  2567. if ((int64_t) buffered_len > conn->content_len) {
  2568. buffered_len = (int) conn->content_len;
  2569. }
  2570. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2571. conn->consumed_content += buffered_len;
  2572. }
  2573. nread = 0;
  2574. while (conn->consumed_content < conn->content_len) {
  2575. to_read = sizeof(buf);
  2576. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2577. to_read = (int) (conn->content_len - conn->consumed_content);
  2578. }
  2579. nread = pull(NULL, conn, buf, to_read);
  2580. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2581. break;
  2582. }
  2583. conn->consumed_content += nread;
  2584. }
  2585. if (conn->consumed_content == conn->content_len) {
  2586. success = nread >= 0;
  2587. }
  2588. // Each error code path in this function must send an error
  2589. if (!success) {
  2590. send_http_error(conn, 577, http_500_error, "%s", "");
  2591. }
  2592. }
  2593. return success;
  2594. }
  2595. #if !defined(NO_CGI)
  2596. // This structure helps to create an environment for the spawned CGI program.
  2597. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2598. // last element must be NULL.
  2599. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2600. // strings must reside in a contiguous buffer. The end of the buffer is
  2601. // marked by two '\0' characters.
  2602. // We satisfy both worlds: we create an envp array (which is vars), all
  2603. // entries are actually pointers inside buf.
  2604. struct cgi_env_block {
  2605. struct mg_connection *conn;
  2606. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2607. int len; // Space taken
  2608. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2609. int nvars; // Number of variables
  2610. };
  2611. static char *addenv(struct cgi_env_block *block,
  2612. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2613. PRINTF_ARGS(2, 3);
  2614. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2615. // pointer into the vars array.
  2616. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2617. int n, space;
  2618. char *added;
  2619. va_list ap;
  2620. // Calculate how much space is left in the buffer
  2621. space = sizeof(block->buf) - block->len - 2;
  2622. assert(space >= 0);
  2623. // Make a pointer to the free space int the buffer
  2624. added = block->buf + block->len;
  2625. // Copy VARIABLE=VALUE\0 string into the free space
  2626. va_start(ap, fmt);
  2627. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2628. va_end(ap);
  2629. // Make sure we do not overflow buffer and the envp array
  2630. if (n > 0 && n + 1 < space &&
  2631. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2632. // Append a pointer to the added string into the envp array
  2633. block->vars[block->nvars++] = added;
  2634. // Bump up used length counter. Include \0 terminator
  2635. block->len += n + 1;
  2636. } else {
  2637. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2638. }
  2639. return added;
  2640. }
  2641. static void prepare_cgi_environment(struct mg_connection *conn,
  2642. const char *prog,
  2643. struct cgi_env_block *blk) {
  2644. const char *s, *slash;
  2645. struct vec var_vec;
  2646. char *p, src_addr[20];
  2647. int i;
  2648. blk->len = blk->nvars = 0;
  2649. blk->conn = conn;
  2650. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2651. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2652. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2653. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2654. // Prepare the environment block
  2655. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2656. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2657. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2658. // TODO(lsm): fix this for IPv6 case
  2659. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2660. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2661. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2662. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2663. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2664. // SCRIPT_NAME
  2665. assert(conn->request_info.uri[0] == '/');
  2666. slash = strrchr(conn->request_info.uri, '/');
  2667. if ((s = strrchr(prog, '/')) == NULL)
  2668. s = prog;
  2669. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2670. conn->request_info.uri, s);
  2671. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2672. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2673. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2674. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2675. addenv(blk, "CONTENT_TYPE=%s", s);
  2676. if (conn->request_info.query_string != NULL)
  2677. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2678. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2679. addenv(blk, "CONTENT_LENGTH=%s", s);
  2680. if ((s = getenv("PATH")) != NULL)
  2681. addenv(blk, "PATH=%s", s);
  2682. if (conn->path_info != NULL) {
  2683. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2684. }
  2685. #if defined(_WIN32)
  2686. if ((s = getenv("COMSPEC")) != NULL) {
  2687. addenv(blk, "COMSPEC=%s", s);
  2688. }
  2689. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2690. addenv(blk, "SYSTEMROOT=%s", s);
  2691. }
  2692. if ((s = getenv("SystemDrive")) != NULL) {
  2693. addenv(blk, "SystemDrive=%s", s);
  2694. }
  2695. if ((s = getenv("ProgramFiles")) != NULL) {
  2696. addenv(blk, "ProgramFiles=%s", s);
  2697. }
  2698. if ((s = getenv("ProgramFiles(x86)")) != NULL) {
  2699. addenv(blk, "ProgramFiles(x86)=%s", s);
  2700. }
  2701. #else
  2702. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2703. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2704. #endif // _WIN32
  2705. if ((s = getenv("PERLLIB")) != NULL)
  2706. addenv(blk, "PERLLIB=%s", s);
  2707. if (conn->request_info.remote_user != NULL) {
  2708. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2709. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2710. }
  2711. // Add all headers as HTTP_* variables
  2712. for (i = 0; i < conn->request_info.num_headers; i++) {
  2713. p = addenv(blk, "HTTP_%s=%s",
  2714. conn->request_info.http_headers[i].name,
  2715. conn->request_info.http_headers[i].value);
  2716. // Convert variable name into uppercase, and change - to _
  2717. for (; *p != '=' && *p != '\0'; p++) {
  2718. if (*p == '-')
  2719. *p = '_';
  2720. *p = (char) toupper(* (unsigned char *) p);
  2721. }
  2722. }
  2723. // Add user-specified variables
  2724. s = conn->ctx->config[CGI_ENVIRONMENT];
  2725. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2726. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2727. }
  2728. blk->vars[blk->nvars++] = NULL;
  2729. blk->buf[blk->len++] = '\0';
  2730. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2731. assert(blk->len > 0);
  2732. assert(blk->len < (int) sizeof(blk->buf));
  2733. }
  2734. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2735. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2736. const char *status, *status_text;
  2737. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2738. struct mg_request_info ri;
  2739. struct cgi_env_block blk;
  2740. FILE *in, *out;
  2741. struct file fout = STRUCT_FILE_INITIALIZER;
  2742. pid_t pid;
  2743. prepare_cgi_environment(conn, prog, &blk);
  2744. // CGI must be executed in its own directory. 'dir' must point to the
  2745. // directory containing executable program, 'p' must point to the
  2746. // executable program name relative to 'dir'.
  2747. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2748. if ((p = strrchr(dir, '/')) != NULL) {
  2749. *p++ = '\0';
  2750. } else {
  2751. dir[0] = '.', dir[1] = '\0';
  2752. p = (char *) prog;
  2753. }
  2754. pid = (pid_t) -1;
  2755. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2756. in = out = NULL;
  2757. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2758. send_http_error(conn, 500, http_500_error,
  2759. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2760. goto done;
  2761. }
  2762. pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
  2763. dir);
  2764. // spawn_process() must close those!
  2765. // If we don't mark them as closed, close() attempt before
  2766. // return from this function throws an exception on Windows.
  2767. // Windows does not like when closed descriptor is closed again.
  2768. fd_stdin[0] = fd_stdout[1] = -1;
  2769. if (pid == (pid_t) -1) {
  2770. send_http_error(conn, 500, http_500_error,
  2771. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2772. goto done;
  2773. }
  2774. if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2775. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2776. send_http_error(conn, 500, http_500_error,
  2777. "fopen: %s", strerror(ERRNO));
  2778. goto done;
  2779. }
  2780. setbuf(in, NULL);
  2781. setbuf(out, NULL);
  2782. fout.fp = out;
  2783. // Send POST data to the CGI process if needed
  2784. if (!strcmp(conn->request_info.request_method, "POST") &&
  2785. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2786. goto done;
  2787. }
  2788. // Close so child gets an EOF.
  2789. fclose(in);
  2790. in = NULL;
  2791. fd_stdin[1] = -1;
  2792. // Now read CGI reply into a buffer. We need to set correct
  2793. // status code, thus we need to see all HTTP headers first.
  2794. // Do not send anything back to client, until we buffer in all
  2795. // HTTP headers.
  2796. data_len = 0;
  2797. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2798. if (headers_len <= 0) {
  2799. send_http_error(conn, 500, http_500_error,
  2800. "CGI program sent malformed or too big (>%u bytes) "
  2801. "HTTP headers: [%.*s]",
  2802. (unsigned) sizeof(buf), data_len, buf);
  2803. goto done;
  2804. }
  2805. pbuf = buf;
  2806. buf[headers_len - 1] = '\0';
  2807. parse_http_headers(&pbuf, &ri);
  2808. // Make up and send the status line
  2809. status_text = "OK";
  2810. if ((status = get_header(&ri, "Status")) != NULL) {
  2811. conn->status_code = atoi(status);
  2812. status_text = status;
  2813. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2814. status_text++;
  2815. }
  2816. } else if (get_header(&ri, "Location") != NULL) {
  2817. conn->status_code = 302;
  2818. } else {
  2819. conn->status_code = 200;
  2820. }
  2821. if (get_header(&ri, "Connection") != NULL &&
  2822. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2823. conn->must_close = 1;
  2824. }
  2825. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2826. status_text);
  2827. // Send headers
  2828. for (i = 0; i < ri.num_headers; i++) {
  2829. mg_printf(conn, "%s: %s\r\n",
  2830. ri.http_headers[i].name, ri.http_headers[i].value);
  2831. }
  2832. mg_write(conn, "\r\n", 2);
  2833. // Send chunk of data that may have been read after the headers
  2834. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2835. (size_t)(data_len - headers_len));
  2836. // Read the rest of CGI output and send to the client
  2837. send_file_data(conn, &fout, 0, INT64_MAX);
  2838. done:
  2839. if (pid != (pid_t) -1) {
  2840. kill(pid, SIGKILL);
  2841. }
  2842. if (fd_stdin[0] != -1) {
  2843. close(fd_stdin[0]);
  2844. }
  2845. if (fd_stdout[1] != -1) {
  2846. close(fd_stdout[1]);
  2847. }
  2848. if (in != NULL) {
  2849. fclose(in);
  2850. } else if (fd_stdin[1] != -1) {
  2851. close(fd_stdin[1]);
  2852. }
  2853. if (out != NULL) {
  2854. fclose(out);
  2855. } else if (fd_stdout[0] != -1) {
  2856. close(fd_stdout[0]);
  2857. }
  2858. }
  2859. #endif // !NO_CGI
  2860. // For a given PUT path, create all intermediate subdirectories
  2861. // for given path. Return 0 if the path itself is a directory,
  2862. // or -1 on error, 1 if OK.
  2863. static int put_dir(struct mg_connection *conn, const char *path) {
  2864. char buf[PATH_MAX];
  2865. const char *s, *p;
  2866. struct file file = STRUCT_FILE_INITIALIZER;
  2867. int len, res = 1;
  2868. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  2869. len = p - path;
  2870. if (len >= (int) sizeof(buf)) {
  2871. res = -1;
  2872. break;
  2873. }
  2874. memcpy(buf, path, len);
  2875. buf[len] = '\0';
  2876. // Try to create intermediate directory
  2877. DEBUG_TRACE(("mkdir(%s)", buf));
  2878. if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
  2879. res = -1;
  2880. break;
  2881. }
  2882. // Is path itself a directory?
  2883. if (p[1] == '\0') {
  2884. res = 0;
  2885. }
  2886. }
  2887. return res;
  2888. }
  2889. static void put_file(struct mg_connection *conn, const char *path) {
  2890. struct file file = STRUCT_FILE_INITIALIZER;
  2891. const char *range;
  2892. int64_t r1, r2;
  2893. int rc;
  2894. conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
  2895. if ((rc = put_dir(conn, path)) == 0) {
  2896. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2897. } else if (rc == -1) {
  2898. send_http_error(conn, 500, http_500_error,
  2899. "put_dir(%s): %s", path, strerror(ERRNO));
  2900. } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
  2901. mg_fclose(&file);
  2902. send_http_error(conn, 500, http_500_error,
  2903. "fopen(%s): %s", path, strerror(ERRNO));
  2904. } else {
  2905. fclose_on_exec(&file);
  2906. range = mg_get_header(conn, "Content-Range");
  2907. r1 = r2 = 0;
  2908. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  2909. conn->status_code = 206;
  2910. fseeko(file.fp, r1, SEEK_SET);
  2911. }
  2912. if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
  2913. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2914. }
  2915. mg_fclose(&file);
  2916. }
  2917. }
  2918. static void send_ssi_file(struct mg_connection *, const char *,
  2919. struct file *, int);
  2920. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  2921. char *tag, int include_level) {
  2922. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  2923. struct file file = STRUCT_FILE_INITIALIZER;
  2924. // sscanf() is safe here, since send_ssi_file() also uses buffer
  2925. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  2926. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  2927. // File name is relative to the webserver root
  2928. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  2929. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  2930. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
  2931. // File name is relative to the webserver working directory
  2932. // or it is absolute system path
  2933. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  2934. } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  2935. // File name is relative to the currect document
  2936. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  2937. if ((p = strrchr(path, '/')) != NULL) {
  2938. p[1] = '\0';
  2939. }
  2940. (void) mg_snprintf(conn, path + strlen(path),
  2941. sizeof(path) - strlen(path), "%s", file_name);
  2942. } else {
  2943. cry(conn, "Bad SSI #include: [%s]", tag);
  2944. return;
  2945. }
  2946. if (!mg_fopen(conn, path, "rb", &file)) {
  2947. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  2948. tag, path, strerror(ERRNO));
  2949. } else {
  2950. fclose_on_exec(&file);
  2951. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  2952. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  2953. send_ssi_file(conn, path, &file, include_level + 1);
  2954. } else {
  2955. send_file_data(conn, &file, 0, INT64_MAX);
  2956. }
  2957. mg_fclose(&file);
  2958. }
  2959. }
  2960. #if !defined(NO_POPEN)
  2961. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  2962. char cmd[MG_BUF_LEN];
  2963. struct file file = STRUCT_FILE_INITIALIZER;
  2964. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  2965. cry(conn, "Bad SSI #exec: [%s]", tag);
  2966. } else if ((file.fp = popen(cmd, "r")) == NULL) {
  2967. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  2968. } else {
  2969. send_file_data(conn, &file, 0, INT64_MAX);
  2970. pclose(file.fp);
  2971. }
  2972. }
  2973. #endif // !NO_POPEN
  2974. static int mg_fgetc(struct file *filep, int offset) {
  2975. if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
  2976. return ((unsigned char *) filep->membuf)[offset];
  2977. } else if (filep->fp != NULL) {
  2978. return fgetc(filep->fp);
  2979. } else {
  2980. return EOF;
  2981. }
  2982. }
  2983. static void send_ssi_file(struct mg_connection *conn, const char *path,
  2984. struct file *filep, int include_level) {
  2985. char buf[MG_BUF_LEN];
  2986. int ch, offset, len, in_ssi_tag;
  2987. if (include_level > 10) {
  2988. cry(conn, "SSI #include level is too deep (%s)", path);
  2989. return;
  2990. }
  2991. in_ssi_tag = len = offset = 0;
  2992. while ((ch = mg_fgetc(filep, offset)) != EOF) {
  2993. if (in_ssi_tag && ch == '>') {
  2994. in_ssi_tag = 0;
  2995. buf[len++] = (char) ch;
  2996. buf[len] = '\0';
  2997. assert(len <= (int) sizeof(buf));
  2998. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  2999. // Not an SSI tag, pass it
  3000. (void) mg_write(conn, buf, (size_t) len);
  3001. } else {
  3002. if (!memcmp(buf + 5, "include", 7)) {
  3003. do_ssi_include(conn, path, buf + 12, include_level);
  3004. #if !defined(NO_POPEN)
  3005. } else if (!memcmp(buf + 5, "exec", 4)) {
  3006. do_ssi_exec(conn, buf + 9);
  3007. #endif // !NO_POPEN
  3008. } else {
  3009. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  3010. }
  3011. }
  3012. len = 0;
  3013. } else if (in_ssi_tag) {
  3014. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  3015. // Not an SSI tag
  3016. in_ssi_tag = 0;
  3017. } else if (len == (int) sizeof(buf) - 2) {
  3018. cry(conn, "%s: SSI tag is too large", path);
  3019. len = 0;
  3020. }
  3021. buf[len++] = ch & 0xff;
  3022. } else if (ch == '<') {
  3023. in_ssi_tag = 1;
  3024. if (len > 0) {
  3025. mg_write(conn, buf, (size_t) len);
  3026. }
  3027. len = 0;
  3028. buf[len++] = ch & 0xff;
  3029. } else {
  3030. buf[len++] = ch & 0xff;
  3031. if (len == (int) sizeof(buf)) {
  3032. mg_write(conn, buf, (size_t) len);
  3033. len = 0;
  3034. }
  3035. }
  3036. }
  3037. // Send the rest of buffered data
  3038. if (len > 0) {
  3039. mg_write(conn, buf, (size_t) len);
  3040. }
  3041. }
  3042. static void handle_ssi_file_request(struct mg_connection *conn,
  3043. const char *path) {
  3044. struct file file = STRUCT_FILE_INITIALIZER;
  3045. if (!mg_fopen(conn, path, "rb", &file)) {
  3046. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  3047. strerror(ERRNO));
  3048. } else {
  3049. conn->must_close = 1;
  3050. fclose_on_exec(&file);
  3051. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  3052. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  3053. suggest_connection_header(conn));
  3054. send_ssi_file(conn, path, &file, 0);
  3055. mg_fclose(&file);
  3056. }
  3057. }
  3058. static void send_options(struct mg_connection *conn) {
  3059. conn->status_code = 200;
  3060. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3061. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
  3062. "DAV: 1\r\n\r\n");
  3063. }
  3064. // Writes PROPFIND properties for a collection element
  3065. static void print_props(struct mg_connection *conn, const char* uri,
  3066. struct file *filep) {
  3067. char mtime[64];
  3068. gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
  3069. conn->num_bytes_sent += mg_printf(conn,
  3070. "<d:response>"
  3071. "<d:href>%s</d:href>"
  3072. "<d:propstat>"
  3073. "<d:prop>"
  3074. "<d:resourcetype>%s</d:resourcetype>"
  3075. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3076. "<d:getlastmodified>%s</d:getlastmodified>"
  3077. "</d:prop>"
  3078. "<d:status>HTTP/1.1 200 OK</d:status>"
  3079. "</d:propstat>"
  3080. "</d:response>\n",
  3081. uri,
  3082. filep->is_directory ? "<d:collection/>" : "",
  3083. filep->size,
  3084. mtime);
  3085. }
  3086. static void print_dav_dir_entry(struct de *de, void *data) {
  3087. char href[PATH_MAX];
  3088. struct mg_connection *conn = (struct mg_connection *) data;
  3089. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3090. conn->request_info.uri, de->file_name);
  3091. print_props(conn, href, &de->file);
  3092. }
  3093. static void handle_propfind(struct mg_connection *conn, const char *path,
  3094. struct file *filep) {
  3095. const char *depth = mg_get_header(conn, "Depth");
  3096. conn->must_close = 1;
  3097. conn->status_code = 207;
  3098. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3099. "Connection: close\r\n"
  3100. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3101. conn->num_bytes_sent += mg_printf(conn,
  3102. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3103. "<d:multistatus xmlns:d='DAV:'>\n");
  3104. // Print properties for the requested resource itself
  3105. print_props(conn, conn->request_info.uri, filep);
  3106. // If it is a directory, print directory entries too if Depth is not 0
  3107. if (filep->is_directory &&
  3108. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3109. (depth == NULL || strcmp(depth, "0") != 0)) {
  3110. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3111. }
  3112. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3113. }
  3114. #if defined(USE_WEBSOCKET)
  3115. // START OF SHA-1 code
  3116. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3117. #define SHA1HANDSOFF
  3118. #if defined(__sun)
  3119. #include "solarisfixes.h"
  3120. #endif
  3121. union char64long16 { unsigned char c[64]; uint32_t l[16]; };
  3122. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3123. static uint32_t blk0(union char64long16 *block, int i) {
  3124. // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
  3125. if (!is_big_endian()) {
  3126. block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
  3127. (rol(block->l[i], 8) & 0x00FF00FF);
  3128. }
  3129. return block->l[i];
  3130. }
  3131. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3132. ^block->l[(i+2)&15]^block->l[i&15],1))
  3133. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
  3134. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3135. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3136. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3137. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3138. typedef struct {
  3139. uint32_t state[5];
  3140. uint32_t count[2];
  3141. unsigned char buffer[64];
  3142. } SHA1_CTX;
  3143. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3144. uint32_t a, b, c, d, e;
  3145. union char64long16 block[1];
  3146. memcpy(block, buffer, 64);
  3147. a = state[0];
  3148. b = state[1];
  3149. c = state[2];
  3150. d = state[3];
  3151. e = state[4];
  3152. 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);
  3153. 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);
  3154. 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);
  3155. 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);
  3156. 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);
  3157. 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);
  3158. 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);
  3159. 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);
  3160. 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);
  3161. 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);
  3162. 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);
  3163. 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);
  3164. 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);
  3165. 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);
  3166. 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);
  3167. 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);
  3168. 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);
  3169. 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);
  3170. 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);
  3171. 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);
  3172. state[0] += a;
  3173. state[1] += b;
  3174. state[2] += c;
  3175. state[3] += d;
  3176. state[4] += e;
  3177. a = b = c = d = e = 0;
  3178. memset(block, '\0', sizeof(block));
  3179. }
  3180. static void SHA1Init(SHA1_CTX* context) {
  3181. context->state[0] = 0x67452301;
  3182. context->state[1] = 0xEFCDAB89;
  3183. context->state[2] = 0x98BADCFE;
  3184. context->state[3] = 0x10325476;
  3185. context->state[4] = 0xC3D2E1F0;
  3186. context->count[0] = context->count[1] = 0;
  3187. }
  3188. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3189. uint32_t len) {
  3190. uint32_t i, j;
  3191. j = context->count[0];
  3192. if ((context->count[0] += len << 3) < j)
  3193. context->count[1]++;
  3194. context->count[1] += (len>>29);
  3195. j = (j >> 3) & 63;
  3196. if ((j + len) > 63) {
  3197. memcpy(&context->buffer[j], data, (i = 64-j));
  3198. SHA1Transform(context->state, context->buffer);
  3199. for ( ; i + 63 < len; i += 64) {
  3200. SHA1Transform(context->state, &data[i]);
  3201. }
  3202. j = 0;
  3203. }
  3204. else i = 0;
  3205. memcpy(&context->buffer[j], &data[i], len - i);
  3206. }
  3207. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3208. unsigned i;
  3209. unsigned char finalcount[8], c;
  3210. for (i = 0; i < 8; i++) {
  3211. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3212. >> ((3-(i & 3)) * 8) ) & 255);
  3213. }
  3214. c = 0200;
  3215. SHA1Update(context, &c, 1);
  3216. while ((context->count[0] & 504) != 448) {
  3217. c = 0000;
  3218. SHA1Update(context, &c, 1);
  3219. }
  3220. SHA1Update(context, finalcount, 8);
  3221. for (i = 0; i < 20; i++) {
  3222. digest[i] = (unsigned char)
  3223. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3224. }
  3225. memset(context, '\0', sizeof(*context));
  3226. memset(&finalcount, '\0', sizeof(finalcount));
  3227. }
  3228. // END OF SHA1 CODE
  3229. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3230. static const char *b64 =
  3231. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3232. int i, j, a, b, c;
  3233. for (i = j = 0; i < src_len; i += 3) {
  3234. a = src[i];
  3235. b = i + 1 >= src_len ? 0 : src[i + 1];
  3236. c = i + 2 >= src_len ? 0 : src[i + 2];
  3237. dst[j++] = b64[a >> 2];
  3238. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3239. if (i + 1 < src_len) {
  3240. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3241. }
  3242. if (i + 2 < src_len) {
  3243. dst[j++] = b64[c & 63];
  3244. }
  3245. }
  3246. while (j % 4 != 0) {
  3247. dst[j++] = '=';
  3248. }
  3249. dst[j++] = '\0';
  3250. }
  3251. static void send_websocket_handshake(struct mg_connection *conn) {
  3252. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3253. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3254. SHA1_CTX sha_ctx;
  3255. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3256. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3257. SHA1Init(&sha_ctx);
  3258. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3259. SHA1Final((unsigned char *) sha, &sha_ctx);
  3260. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3261. mg_printf(conn, "%s%s%s",
  3262. "HTTP/1.1 101 Switching Protocols\r\n"
  3263. "Upgrade: websocket\r\n"
  3264. "Connection: Upgrade\r\n"
  3265. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3266. }
  3267. static void read_websocket(struct mg_connection *conn) {
  3268. unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
  3269. int n;
  3270. size_t i, len, mask_len, data_len, header_len, body_len;
  3271. char mem[4 * 1024], *data;
  3272. assert(conn->content_len == 0);
  3273. for (;;) {
  3274. header_len = 0;
  3275. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3276. len = buf[1] & 127;
  3277. mask_len = buf[1] & 128 ? 4 : 0;
  3278. if (len < 126 && body_len >= mask_len) {
  3279. data_len = len;
  3280. header_len = 2 + mask_len;
  3281. } else if (len == 126 && body_len >= 4 + mask_len) {
  3282. header_len = 4 + mask_len;
  3283. data_len = ((((int) buf[2]) << 8) + buf[3]);
  3284. } else if (body_len >= 10 + mask_len) {
  3285. header_len = 10 + mask_len;
  3286. data_len = (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
  3287. htonl(* (uint32_t *) &buf[6]);
  3288. }
  3289. }
  3290. if (header_len > 0) {
  3291. // Allocate space to hold websocket payload
  3292. data = mem;
  3293. if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
  3294. // Allocation failed, exit the loop and then close the connection
  3295. // TODO: notify user about the failure
  3296. break;
  3297. }
  3298. // Read frame payload into the allocated buffer.
  3299. assert(body_len >= header_len);
  3300. if (data_len + header_len > body_len) {
  3301. len = body_len - header_len;
  3302. memcpy(data, buf + header_len, len);
  3303. // TODO: handle pull error
  3304. pull(NULL, conn, data + len, data_len - len);
  3305. conn->data_len = 0;
  3306. } else {
  3307. len = data_len + header_len;
  3308. memcpy(data, buf + header_len, data_len);
  3309. memmove(buf, buf + len, body_len - len);
  3310. conn->data_len -= len;
  3311. }
  3312. // Apply mask if necessary
  3313. if (mask_len > 0) {
  3314. for (i = 0; i < data_len; i++) {
  3315. data[i] ^= buf[header_len - mask_len + (i % 4)];
  3316. }
  3317. }
  3318. // Exit the loop if callback signalled to exit,
  3319. // or "connection close" opcode received.
  3320. if ((conn->ctx->callbacks.websocket_data != NULL &&
  3321. !conn->ctx->callbacks.websocket_data(conn, buf[0], data, data_len)) ||
  3322. (buf[0] & 0xf) == 8) { // Opcode == 8, connection close
  3323. break;
  3324. }
  3325. if (data != mem) {
  3326. free(data);
  3327. }
  3328. // Not breaking the loop, process next websocket frame.
  3329. } else {
  3330. // Buffering websocket request
  3331. if ((n = pull(NULL, conn, conn->buf + conn->data_len,
  3332. conn->buf_size - conn->data_len)) <= 0) {
  3333. break;
  3334. }
  3335. conn->data_len += n;
  3336. }
  3337. }
  3338. }
  3339. static void handle_websocket_request(struct mg_connection *conn) {
  3340. if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
  3341. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3342. } else if (conn->ctx->callbacks.websocket_connect != NULL &&
  3343. conn->ctx->callbacks.websocket_connect(conn) != 0) {
  3344. // Callback has returned non-zero, do not proceed with handshake
  3345. } else {
  3346. send_websocket_handshake(conn);
  3347. if (conn->ctx->callbacks.websocket_ready != NULL) {
  3348. conn->ctx->callbacks.websocket_ready(conn);
  3349. }
  3350. read_websocket(conn);
  3351. }
  3352. }
  3353. static int is_websocket_request(const struct mg_connection *conn) {
  3354. const char *host, *upgrade, *connection, *version, *key;
  3355. host = mg_get_header(conn, "Host");
  3356. upgrade = mg_get_header(conn, "Upgrade");
  3357. connection = mg_get_header(conn, "Connection");
  3358. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3359. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3360. return host != NULL && upgrade != NULL && connection != NULL &&
  3361. key != NULL && version != NULL &&
  3362. mg_strcasestr(upgrade, "websocket") != NULL &&
  3363. mg_strcasestr(connection, "Upgrade") != NULL;
  3364. }
  3365. #endif // !USE_WEBSOCKET
  3366. static int isbyte(int n) {
  3367. return n >= 0 && n <= 255;
  3368. }
  3369. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3370. int n, a, b, c, d, slash = 32, len = 0;
  3371. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3372. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3373. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3374. slash >= 0 && slash < 33) {
  3375. len = n;
  3376. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3377. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3378. }
  3379. return len;
  3380. }
  3381. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3382. int throttle = 0;
  3383. struct vec vec, val;
  3384. uint32_t net, mask;
  3385. char mult;
  3386. double v;
  3387. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3388. mult = ',';
  3389. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3390. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3391. continue;
  3392. }
  3393. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3394. if (vec.len == 1 && vec.ptr[0] == '*') {
  3395. throttle = (int) v;
  3396. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3397. if ((remote_ip & mask) == net) {
  3398. throttle = (int) v;
  3399. }
  3400. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3401. throttle = (int) v;
  3402. }
  3403. }
  3404. return throttle;
  3405. }
  3406. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3407. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3408. }
  3409. #ifdef USE_LUA
  3410. #ifdef _WIN32
  3411. static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
  3412. int offset) {
  3413. HANDLE fh = (HANDLE) _get_osfhandle(fd);
  3414. HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
  3415. void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
  3416. CloseHandle(mh);
  3417. return p;
  3418. }
  3419. #define munmap(x, y) UnmapViewOfFile(x)
  3420. #define MAP_FAILED NULL
  3421. #define MAP_PRIVATE 0
  3422. #define PROT_READ 0
  3423. #else
  3424. #include <sys/mman.h>
  3425. #endif
  3426. static void handle_request(struct mg_connection *);
  3427. static int handle_lsp_request(struct mg_connection *, const char *,
  3428. struct file *, struct lua_State *);
  3429. static int lsp_mg_error(lua_State *L) {
  3430. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3431. int top = lua_gettop(L);
  3432. if (top < 1) lua_pushstring(L, "unknown error");
  3433. // Get mg.onerror.
  3434. lua_getglobal(L, "mg");
  3435. lua_getfield(L, -1, "onerror");
  3436. // If mg.onerror is nil, silently stop processing chunks.
  3437. if (lua_isnil(L, -1)) {
  3438. lua_pushinteger(L, 1);
  3439. return 1;
  3440. }
  3441. // Call mg.onerror.
  3442. lua_pushvalue(L, top);
  3443. lua_remove(L, top);
  3444. if (lua_pcall(L, 1, 1, 0)) {
  3445. // If mg.onerror fails, cry the error message and stop processing chunks.
  3446. cry(conn, "mg.onerror failed: %s", lua_tostring(L, -1));
  3447. lua_pushinteger(L, 1);
  3448. return 1;
  3449. }
  3450. // Return the return value from mg.onerror. Non-0 = stop processing chunks.
  3451. return 1;
  3452. }
  3453. // Silently stop processing chunks.
  3454. static void lsp_abort(lua_State *L) {
  3455. int top = lua_gettop(L);
  3456. lua_getglobal(L, "mg");
  3457. lua_pushnil(L);
  3458. lua_setfield(L, -2, "onerror");
  3459. lua_settop(L, top);
  3460. lua_pushstring(L, "aborting");
  3461. lua_error(L);
  3462. }
  3463. static int lsp(struct mg_connection *conn, const char *path,
  3464. const char *p, int64_t len, lua_State *L) {
  3465. int i, j, result, pos = 0, lines = 1, lualines = 0;
  3466. char chunkname [MG_BUF_LEN];
  3467. for (i = 0; i < len; i++) {
  3468. if (p[i] == '\n') ++lines;
  3469. if (p[i] == '<' && p[i + 1] == '?') {
  3470. for (j = i + 1; j < len ; j++) {
  3471. if (p[j] == '\n') ++lualines;
  3472. if (p[j] == '?' && p[j + 1] == '>') {
  3473. mg_write(conn, p + pos, i - pos);
  3474. lua_pushlightuserdata(L, conn);
  3475. lua_pushcclosure(L, lsp_mg_error, 1);
  3476. snprintf (chunkname, sizeof(chunkname), "@%s+%i", path, lines);
  3477. if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), chunkname)) {
  3478. lua_pcall(L, 1, 1, 0);
  3479. result = lua_tointeger(L, -1);
  3480. if (result) return result;
  3481. } else {
  3482. lua_pcall(L, 0, 0, 1);
  3483. result = lua_tointeger(L, -1);
  3484. if (result) return result;
  3485. }
  3486. pos = j + 2;
  3487. i = pos - 1;
  3488. break;
  3489. }
  3490. }
  3491. if (lualines > 0) {
  3492. lines += lualines;
  3493. lualines = 0;
  3494. }
  3495. }
  3496. }
  3497. if (i > pos) {
  3498. mg_write(conn, p + pos, i - pos);
  3499. }
  3500. return 0;
  3501. }
  3502. static int lsp_mg_print(lua_State *L) {
  3503. int i, num_args;
  3504. const char *str;
  3505. size_t size;
  3506. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3507. num_args = lua_gettop(L);
  3508. for (i = 1; i <= num_args; i++) {
  3509. if (lua_isstring(L, i)) {
  3510. str = lua_tolstring(L, i, &size);
  3511. mg_write(conn, str, size);
  3512. }
  3513. }
  3514. return 0;
  3515. }
  3516. static int lsp_mg_read(lua_State *L) {
  3517. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3518. char buf[1024];
  3519. int len = mg_read(conn, buf, sizeof(buf));
  3520. lua_settop(L, 0);
  3521. lua_pushlstring(L, buf, len);
  3522. return 1;
  3523. }
  3524. // mg.include: Include another .lp file
  3525. static int lsp_mod_include(lua_State *L) {
  3526. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3527. struct file file = STRUCT_FILE_INITIALIZER;
  3528. if (handle_lsp_request(conn, lua_tostring(L, -1), &file, L)) {
  3529. // handle_lsp_request returned an error code, meaning an error occured in
  3530. // the included page and mg.onerror returned non-zero. Stop processing.
  3531. lsp_abort(L);
  3532. }
  3533. return 0;
  3534. }
  3535. // mg.cry: Log an error. Default value for mg.onerror.
  3536. static int lsp_mod_cry(lua_State *L){
  3537. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3538. cry(conn, "%s", lua_tostring(L, -1));
  3539. return 0;
  3540. }
  3541. // mg.redirect: Redirect the request (internally).
  3542. static int lsp_mod_redirect(lua_State *L) {
  3543. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3544. conn->request_info.uri = lua_tostring(L, -1);
  3545. handle_request(conn);
  3546. lsp_abort(L);
  3547. return 0;
  3548. }
  3549. static void reg_string(struct lua_State *L, const char *name, const char *val) {
  3550. lua_pushstring(L, name);
  3551. lua_pushstring(L, val);
  3552. lua_rawset(L, -3);
  3553. }
  3554. static void reg_int(struct lua_State *L, const char *name, int val) {
  3555. lua_pushstring(L, name);
  3556. lua_pushinteger(L, val);
  3557. lua_rawset(L, -3);
  3558. }
  3559. static void reg_function(struct lua_State *L, const char *name,
  3560. lua_CFunction func, struct mg_connection *conn) {
  3561. lua_pushstring(L, name);
  3562. lua_pushlightuserdata(L, conn);
  3563. lua_pushcclosure(L, func, 1);
  3564. lua_rawset(L, -3);
  3565. }
  3566. static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {
  3567. const struct mg_request_info *ri = mg_get_request_info(conn);
  3568. extern void luaL_openlibs(lua_State *);
  3569. int i;
  3570. luaL_openlibs(L);
  3571. #ifdef USE_LUA_SQLITE3
  3572. { extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }
  3573. #endif
  3574. // Register "print" function which calls mg_write()
  3575. lua_pushlightuserdata(L, conn);
  3576. lua_pushcclosure(L, lsp_mg_print, 1);
  3577. lua_setglobal(L, "print");
  3578. // Register mg_read()
  3579. lua_pushlightuserdata(L, conn);
  3580. lua_pushcclosure(L, lsp_mg_read, 1);
  3581. lua_setglobal(L, "read");
  3582. // Register mg module
  3583. lua_newtable(L);
  3584. reg_function(L, "cry", lsp_mod_cry, conn);
  3585. reg_function(L, "include", lsp_mod_include, conn);
  3586. reg_function(L, "onerror", lsp_mod_cry, conn);
  3587. reg_function(L, "redirect", lsp_mod_redirect, conn);
  3588. reg_string(L, "version", MONGOOSE_VERSION);
  3589. lua_setglobal(L, "mg");
  3590. // Export request_info
  3591. lua_newtable(L);
  3592. reg_string(L, "request_method", ri->request_method);
  3593. reg_string(L, "uri", ri->uri);
  3594. reg_string(L, "http_version", ri->http_version);
  3595. reg_string(L, "query_string", ri->query_string);
  3596. reg_int(L, "remote_ip", ri->remote_ip);
  3597. reg_int(L, "remote_port", ri->remote_port);
  3598. reg_int(L, "num_headers", ri->num_headers);
  3599. lua_pushstring(L, "http_headers");
  3600. lua_newtable(L);
  3601. for (i = 0; i < ri->num_headers; i++) {
  3602. reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
  3603. }
  3604. lua_rawset(L, -3);
  3605. lua_setglobal(L, "request_info");
  3606. }
  3607. // Throw a lua error. Called from handle_lsp_request via mg.include
  3608. static void send_lua_error(struct lua_State *L,
  3609. PRINTF_FORMAT_STRING(const char *fmt), ...)
  3610. PRINTF_ARGS(2, 3);
  3611. static void send_lua_error(struct lua_State *L, const char *fmt, ...) {
  3612. char buf[MG_BUF_LEN];
  3613. va_list ap;
  3614. int len = 0;
  3615. va_start(ap, fmt);
  3616. len += vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
  3617. va_end(ap);
  3618. lua_pushstring(L, buf);
  3619. lua_error(L);
  3620. }
  3621. static int handle_lsp_request(struct mg_connection *conn, const char *path,
  3622. struct file *filep, struct lua_State *ls) {
  3623. void *p = NULL;
  3624. lua_State *L = NULL;
  3625. int error = 1;
  3626. if (!mg_stat(conn, path, filep) || !mg_fopen(conn, path, "r", filep)) {
  3627. if (ls == NULL) {
  3628. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3629. } else {
  3630. send_lua_error(ls, "File not found: %s", path);
  3631. }
  3632. } else if (filep->membuf == NULL &&
  3633. (p = mmap(NULL, (size_t) filep->size, PROT_READ, MAP_PRIVATE,
  3634. fileno(filep->fp), 0)) == MAP_FAILED) {
  3635. if (ls == NULL) {
  3636. send_http_error(conn, 500, http_500_error, "mmap(%s, %zu, %d): %s", path,
  3637. (size_t) filep->size, fileno(filep->fp), strerror(errno));
  3638. } else {
  3639. send_lua_error(ls, "mmap(%s, %zu, %d): %s", path,
  3640. (size_t) filep->size, fileno(filep->fp), strerror(errno));
  3641. }
  3642. } else if ((L = ls != NULL ? ls : luaL_newstate()) == NULL) {
  3643. send_http_error(conn, 500, http_500_error, "%s", "luaL_newstate failed");
  3644. } else {
  3645. // We're not sending HTTP headers here, Lua page must do it.
  3646. if (ls == NULL) {
  3647. prepare_lua_environment(conn, L);
  3648. if (conn->ctx->callbacks.init_lua != NULL) {
  3649. conn->ctx->callbacks.init_lua(conn, L);
  3650. }
  3651. }
  3652. error = lsp(conn, path, filep->membuf == NULL ? p : filep->membuf,
  3653. filep->size, L);
  3654. }
  3655. if (L && ls == NULL) lua_close(L);
  3656. if (p) munmap(p, filep->size);
  3657. mg_fclose(filep);
  3658. return error;
  3659. }
  3660. #endif // USE_LUA
  3661. int mg_upload(struct mg_connection *conn, const char *destination_dir) {
  3662. const char *content_type_header, *boundary_start;
  3663. char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
  3664. FILE *fp;
  3665. int bl, n, i, j, headers_len, boundary_len, eof,
  3666. len = 0, num_uploaded_files = 0;
  3667. // Request looks like this:
  3668. //
  3669. // POST /upload HTTP/1.1
  3670. // Host: 127.0.0.1:8080
  3671. // Content-Length: 244894
  3672. // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
  3673. //
  3674. // ------WebKitFormBoundaryRVr
  3675. // Content-Disposition: form-data; name="file"; filename="accum.png"
  3676. // Content-Type: image/png
  3677. //
  3678. // <89>PNG
  3679. // <PNG DATA>
  3680. // ------WebKitFormBoundaryRVr
  3681. // Extract boundary string from the Content-Type header
  3682. if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
  3683. (boundary_start = mg_strcasestr(content_type_header,
  3684. "boundary=")) == NULL ||
  3685. (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
  3686. sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
  3687. boundary[0] == '\0') {
  3688. return num_uploaded_files;
  3689. }
  3690. boundary_len = strlen(boundary);
  3691. bl = boundary_len + 4; // \r\n--<boundary>
  3692. for (;;) {
  3693. // Pull in headers
  3694. assert(len >= 0 && len <= (int) sizeof(buf));
  3695. while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
  3696. len += n;
  3697. }
  3698. if ((headers_len = get_request_len(buf, len)) <= 0) {
  3699. break;
  3700. }
  3701. // Fetch file name.
  3702. fname[0] = '\0';
  3703. for (i = j = 0; i < headers_len; i++) {
  3704. if (buf[i] == '\r' && buf[i + 1] == '\n') {
  3705. buf[i] = buf[i + 1] = '\0';
  3706. // TODO(lsm): don't expect filename to be the 3rd field,
  3707. // parse the header properly instead.
  3708. sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
  3709. fname);
  3710. j = i + 2;
  3711. }
  3712. }
  3713. // Give up if the headers are not what we expect
  3714. if (fname[0] == '\0') {
  3715. break;
  3716. }
  3717. // Move data to the beginning of the buffer
  3718. assert(len >= headers_len);
  3719. memmove(buf, &buf[headers_len], len - headers_len);
  3720. len -= headers_len;
  3721. // We open the file with exclusive lock held. This guarantee us
  3722. // there is no other thread can save into the same file simultaneously.
  3723. fp = NULL;
  3724. // Construct destination file name. Do not allow paths to have slashes.
  3725. if ((s = strrchr(fname, '/')) == NULL) {
  3726. s = fname;
  3727. }
  3728. // Open file in binary mode. TODO: set an exclusive lock.
  3729. snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
  3730. if ((fp = fopen(path, "wb")) == NULL) {
  3731. break;
  3732. }
  3733. // Read POST data, write into file until boundary is found.
  3734. eof = n = 0;
  3735. do {
  3736. len += n;
  3737. for (i = 0; i < len - bl; i++) {
  3738. if (!memcmp(&buf[i], "\r\n--", 4) &&
  3739. !memcmp(&buf[i + 4], boundary, boundary_len)) {
  3740. // Found boundary, that's the end of file data.
  3741. fwrite(buf, 1, i, fp);
  3742. eof = 1;
  3743. memmove(buf, &buf[i + bl], len - (i + bl));
  3744. len -= i + bl;
  3745. break;
  3746. }
  3747. }
  3748. if (!eof && len > bl) {
  3749. fwrite(buf, 1, len - bl, fp);
  3750. memmove(buf, &buf[len - bl], bl);
  3751. len = bl;
  3752. }
  3753. } while (!eof && (n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
  3754. fclose(fp);
  3755. if (eof) {
  3756. num_uploaded_files++;
  3757. if (conn->ctx->callbacks.upload != NULL) {
  3758. conn->ctx->callbacks.upload(conn, path);
  3759. }
  3760. }
  3761. }
  3762. return num_uploaded_files;
  3763. }
  3764. static int is_put_or_delete_request(const struct mg_connection *conn) {
  3765. const char *s = conn->request_info.request_method;
  3766. return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE"));
  3767. }
  3768. static int get_first_ssl_listener_index(const struct mg_context *ctx) {
  3769. int i, index = -1;
  3770. for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
  3771. index = ctx->listening_sockets[i].is_ssl ? i : -1;
  3772. }
  3773. return index;
  3774. }
  3775. static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
  3776. char host[1025];
  3777. const char *host_header;
  3778. if ((host_header = mg_get_header(conn, "Host")) == NULL ||
  3779. sscanf(host_header, "%1024[^:]", host) == 0) {
  3780. // Cannot get host from the Host: header. Fallback to our IP address.
  3781. sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
  3782. }
  3783. mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
  3784. host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
  3785. lsa.sin.sin_port), conn->request_info.uri);
  3786. }
  3787. // This is the heart of the Mongoose's logic.
  3788. // This function is called when the request is read, parsed and validated,
  3789. // and Mongoose must decide what action to take: serve a file, or
  3790. // a directory, or call embedded function, etcetera.
  3791. static void handle_request(struct mg_connection *conn) {
  3792. struct mg_request_info *ri = &conn->request_info;
  3793. char path[PATH_MAX];
  3794. int uri_len, ssl_index;
  3795. struct file file = STRUCT_FILE_INITIALIZER;
  3796. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3797. * ((char *) conn->request_info.query_string++) = '\0';
  3798. }
  3799. uri_len = (int) strlen(ri->uri);
  3800. url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
  3801. remove_double_dots_and_double_slashes((char *) ri->uri);
  3802. convert_uri_to_file_name(conn, path, sizeof(path), &file);
  3803. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3804. get_remote_ip(conn), ri->uri);
  3805. DEBUG_TRACE(("%s", ri->uri));
  3806. // Perform redirect and auth checks before calling begin_request() handler.
  3807. // Otherwise, begin_request() would need to perform auth checks and redirects.
  3808. if (!conn->client.is_ssl && conn->client.ssl_redir &&
  3809. (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
  3810. redirect_to_https_port(conn, ssl_index);
  3811. } else if (!is_put_or_delete_request(conn) &&
  3812. !check_authorization(conn, path)) {
  3813. send_authorization_request(conn);
  3814. } else if (conn->ctx->callbacks.begin_request != NULL &&
  3815. conn->ctx->callbacks.begin_request(conn)) {
  3816. // Do nothing, callback has served the request
  3817. #if defined(USE_WEBSOCKET)
  3818. } else if (is_websocket_request(conn)) {
  3819. handle_websocket_request(conn);
  3820. #endif
  3821. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3822. send_options(conn);
  3823. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3824. send_http_error(conn, 404, "Not Found", "Not Found");
  3825. } else if (is_put_or_delete_request(conn) &&
  3826. (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
  3827. is_authorized_for_put(conn) != 1)) {
  3828. send_authorization_request(conn);
  3829. } else if (!strcmp(ri->request_method, "PUT")) {
  3830. put_file(conn, path);
  3831. } else if (!strcmp(ri->request_method, "DELETE")) {
  3832. if (mg_remove(path) == 0) {
  3833. send_http_error(conn, 200, "OK", "%s", "");
  3834. } else {
  3835. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3836. strerror(ERRNO));
  3837. }
  3838. } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
  3839. must_hide_file(conn, path)) {
  3840. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3841. } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
  3842. mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3843. "Location: %s/\r\n\r\n", ri->uri);
  3844. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3845. handle_propfind(conn, path, &file);
  3846. } else if (file.is_directory &&
  3847. !substitute_index_file(conn, path, sizeof(path), &file)) {
  3848. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3849. handle_directory_request(conn, path);
  3850. } else {
  3851. send_http_error(conn, 403, "Directory Listing Denied",
  3852. "Directory listing denied");
  3853. }
  3854. #ifdef USE_LUA
  3855. } else if (match_prefix("**.lp$", 6, path) > 0) {
  3856. handle_lsp_request(conn, path, &file, NULL);
  3857. #endif
  3858. #if !defined(NO_CGI)
  3859. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3860. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3861. path) > 0) {
  3862. if (strcmp(ri->request_method, "POST") &&
  3863. strcmp(ri->request_method, "HEAD") &&
  3864. strcmp(ri->request_method, "GET")) {
  3865. send_http_error(conn, 501, "Not Implemented",
  3866. "Method %s is not implemented", ri->request_method);
  3867. } else {
  3868. handle_cgi_request(conn, path);
  3869. }
  3870. #endif // !NO_CGI
  3871. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3872. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3873. path) > 0) {
  3874. handle_ssi_file_request(conn, path);
  3875. } else if (is_not_modified(conn, &file)) {
  3876. send_http_error(conn, 304, "Not Modified", "%s", "");
  3877. } else {
  3878. handle_file_request(conn, path, &file);
  3879. }
  3880. }
  3881. static void close_all_listening_sockets(struct mg_context *ctx) {
  3882. int i;
  3883. for (i = 0; i < ctx->num_listening_sockets; i++) {
  3884. closesocket(ctx->listening_sockets[i].sock);
  3885. }
  3886. free(ctx->listening_sockets);
  3887. }
  3888. // Valid listening port specification is: [ip_address:]port[s]
  3889. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3890. // TODO(lsm): add parsing of the IPv6 address
  3891. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3892. int a, b, c, d, port, len;
  3893. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3894. // Also, all-zeroes in the socket address means binding to all addresses
  3895. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3896. memset(so, 0, sizeof(*so));
  3897. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  3898. // Bind to a specific IPv4 address
  3899. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3900. } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
  3901. len <= 0 ||
  3902. len > (int) vec->len ||
  3903. (vec->ptr[len] && vec->ptr[len] != 's' &&
  3904. vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {
  3905. return 0;
  3906. }
  3907. so->is_ssl = vec->ptr[len] == 's';
  3908. so->ssl_redir = vec->ptr[len] == 'r';
  3909. #if defined(USE_IPV6)
  3910. so->lsa.sin6.sin6_family = AF_INET6;
  3911. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3912. #else
  3913. so->lsa.sin.sin_family = AF_INET;
  3914. so->lsa.sin.sin_port = htons((uint16_t) port);
  3915. #endif
  3916. return 1;
  3917. }
  3918. static int set_ports_option(struct mg_context *ctx) {
  3919. const char *list = ctx->config[LISTENING_PORTS];
  3920. int on = 1, success = 1;
  3921. #if defined(USE_IPV6)
  3922. int off = 0;
  3923. #endif
  3924. struct vec vec;
  3925. struct socket so;
  3926. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3927. if (!parse_port_string(&vec, &so)) {
  3928. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3929. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  3930. success = 0;
  3931. } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
  3932. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3933. success = 0;
  3934. } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3935. INVALID_SOCKET ||
  3936. // On Windows, SO_REUSEADDR is recommended only for
  3937. // broadcast UDP sockets
  3938. setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
  3939. (void *) &on, sizeof(on)) != 0 ||
  3940. #if defined(USE_IPV6)
  3941. setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
  3942. sizeof(off)) != 0 ||
  3943. #endif
  3944. bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
  3945. listen(so.sock, SOMAXCONN) != 0) {
  3946. cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
  3947. (int) vec.len, vec.ptr, strerror(ERRNO));
  3948. closesocket(so.sock);
  3949. success = 0;
  3950. } else {
  3951. set_close_on_exec(so.sock);
  3952. // TODO: handle realloc failure
  3953. ctx->listening_sockets = realloc(ctx->listening_sockets,
  3954. (ctx->num_listening_sockets + 1) *
  3955. sizeof(ctx->listening_sockets[0]));
  3956. ctx->listening_sockets[ctx->num_listening_sockets] = so;
  3957. ctx->num_listening_sockets++;
  3958. }
  3959. }
  3960. if (!success) {
  3961. close_all_listening_sockets(ctx);
  3962. }
  3963. return success;
  3964. }
  3965. static void log_header(const struct mg_connection *conn, const char *header,
  3966. FILE *fp) {
  3967. const char *header_value;
  3968. if ((header_value = mg_get_header(conn, header)) == NULL) {
  3969. (void) fprintf(fp, "%s", " -");
  3970. } else {
  3971. (void) fprintf(fp, " \"%s\"", header_value);
  3972. }
  3973. }
  3974. static void log_access(const struct mg_connection *conn) {
  3975. const struct mg_request_info *ri;
  3976. FILE *fp;
  3977. char date[64], src_addr[20];
  3978. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  3979. fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  3980. if (fp == NULL)
  3981. return;
  3982. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3983. localtime(&conn->birth_time));
  3984. ri = &conn->request_info;
  3985. flockfile(fp);
  3986. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  3987. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3988. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  3989. ri->request_method ? ri->request_method : "-",
  3990. ri->uri ? ri->uri : "-", ri->http_version,
  3991. conn->status_code, conn->num_bytes_sent);
  3992. log_header(conn, "Referer", fp);
  3993. log_header(conn, "User-Agent", fp);
  3994. fputc('\n', fp);
  3995. fflush(fp);
  3996. funlockfile(fp);
  3997. fclose(fp);
  3998. }
  3999. // Verify given socket address against the ACL.
  4000. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  4001. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  4002. int allowed, flag;
  4003. uint32_t net, mask;
  4004. struct vec vec;
  4005. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  4006. // If any ACL is set, deny by default
  4007. allowed = list == NULL ? '+' : '-';
  4008. while ((list = next_option(list, &vec, NULL)) != NULL) {
  4009. flag = vec.ptr[0];
  4010. if ((flag != '+' && flag != '-') ||
  4011. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  4012. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  4013. return -1;
  4014. }
  4015. if (net == (remote_ip & mask)) {
  4016. allowed = flag;
  4017. }
  4018. }
  4019. return allowed == '+';
  4020. }
  4021. #if !defined(_WIN32)
  4022. static int set_uid_option(struct mg_context *ctx) {
  4023. struct passwd *pw;
  4024. const char *uid = ctx->config[RUN_AS_USER];
  4025. int success = 0;
  4026. if (uid == NULL) {
  4027. success = 1;
  4028. } else {
  4029. if ((pw = getpwnam(uid)) == NULL) {
  4030. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  4031. } else if (setgid(pw->pw_gid) == -1) {
  4032. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  4033. } else if (setuid(pw->pw_uid) == -1) {
  4034. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  4035. } else {
  4036. success = 1;
  4037. }
  4038. }
  4039. return success;
  4040. }
  4041. #endif // !_WIN32
  4042. #if !defined(NO_SSL)
  4043. static pthread_mutex_t *ssl_mutexes;
  4044. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  4045. return (conn->ssl = SSL_new(s)) != NULL &&
  4046. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  4047. func(conn->ssl) == 1;
  4048. }
  4049. // Return OpenSSL error message
  4050. static const char *ssl_error(void) {
  4051. unsigned long err;
  4052. err = ERR_get_error();
  4053. return err == 0 ? "" : ERR_error_string(err, NULL);
  4054. }
  4055. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  4056. int line) {
  4057. (void) line;
  4058. (void) file;
  4059. if (mode & 1) { // 1 is CRYPTO_LOCK
  4060. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  4061. } else {
  4062. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  4063. }
  4064. }
  4065. static unsigned long ssl_id_callback(void) {
  4066. return (unsigned long) pthread_self();
  4067. }
  4068. #if !defined(NO_SSL_DL)
  4069. static int load_dll(struct mg_context *ctx, const char *dll_name,
  4070. struct ssl_func *sw) {
  4071. union {void *p; void (*fp)(void);} u;
  4072. void *dll_handle;
  4073. struct ssl_func *fp;
  4074. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  4075. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  4076. return 0;
  4077. }
  4078. for (fp = sw; fp->name != NULL; fp++) {
  4079. #ifdef _WIN32
  4080. // GetProcAddress() returns pointer to function
  4081. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  4082. #else
  4083. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  4084. // function pointers. We need to use a union to make a cast.
  4085. u.p = dlsym(dll_handle, fp->name);
  4086. #endif // _WIN32
  4087. if (u.fp == NULL) {
  4088. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  4089. return 0;
  4090. } else {
  4091. fp->ptr = u.fp;
  4092. }
  4093. }
  4094. return 1;
  4095. }
  4096. #endif // NO_SSL_DL
  4097. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  4098. static int set_ssl_option(struct mg_context *ctx) {
  4099. int i, size;
  4100. const char *pem;
  4101. // If PEM file is not specified, skip SSL initialization.
  4102. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
  4103. return 1;
  4104. }
  4105. #if !defined(NO_SSL_DL)
  4106. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  4107. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  4108. return 0;
  4109. }
  4110. #endif // NO_SSL_DL
  4111. // Initialize SSL library
  4112. SSL_library_init();
  4113. SSL_load_error_strings();
  4114. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  4115. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  4116. return 0;
  4117. }
  4118. // If user callback returned non-NULL, that means that user callback has
  4119. // set up certificate itself. In this case, skip sertificate setting.
  4120. if ((ctx->callbacks.init_ssl == NULL ||
  4121. !ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
  4122. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
  4123. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
  4124. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  4125. return 0;
  4126. }
  4127. if (pem != NULL) {
  4128. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  4129. }
  4130. // Initialize locking callbacks, needed for thread safety.
  4131. // http://www.openssl.org/support/faq.html#PROG1
  4132. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  4133. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  4134. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  4135. return 0;
  4136. }
  4137. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4138. pthread_mutex_init(&ssl_mutexes[i], NULL);
  4139. }
  4140. CRYPTO_set_locking_callback(&ssl_locking_callback);
  4141. CRYPTO_set_id_callback(&ssl_id_callback);
  4142. return 1;
  4143. }
  4144. static void uninitialize_ssl(struct mg_context *ctx) {
  4145. int i;
  4146. if (ctx->ssl_ctx != NULL) {
  4147. CRYPTO_set_locking_callback(NULL);
  4148. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4149. pthread_mutex_destroy(&ssl_mutexes[i]);
  4150. }
  4151. CRYPTO_set_locking_callback(NULL);
  4152. CRYPTO_set_id_callback(NULL);
  4153. }
  4154. }
  4155. #endif // !NO_SSL
  4156. static int set_gpass_option(struct mg_context *ctx) {
  4157. struct file file = STRUCT_FILE_INITIALIZER;
  4158. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  4159. if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
  4160. cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
  4161. return 0;
  4162. }
  4163. return 1;
  4164. }
  4165. static int set_acl_option(struct mg_context *ctx) {
  4166. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  4167. }
  4168. static void reset_per_request_attributes(struct mg_connection *conn) {
  4169. conn->path_info = NULL;
  4170. conn->num_bytes_sent = conn->consumed_content = 0;
  4171. conn->status_code = -1;
  4172. conn->must_close = conn->request_len = conn->throttle = 0;
  4173. }
  4174. static void close_socket_gracefully(struct mg_connection *conn) {
  4175. #if defined(_WIN32)
  4176. char buf[MG_BUF_LEN];
  4177. int n;
  4178. #endif
  4179. struct linger linger;
  4180. // Set linger option to avoid socket hanging out after close. This prevent
  4181. // ephemeral port exhaust problem under high QPS.
  4182. linger.l_onoff = 1;
  4183. linger.l_linger = 1;
  4184. setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
  4185. (char *) &linger, sizeof(linger));
  4186. // Send FIN to the client
  4187. shutdown(conn->client.sock, SHUT_WR);
  4188. set_non_blocking_mode(conn->client.sock);
  4189. #if defined(_WIN32)
  4190. // Read and discard pending incoming data. If we do not do that and close the
  4191. // socket, the data in the send buffer may be discarded. This
  4192. // behaviour is seen on Windows, when client keeps sending data
  4193. // when server decides to close the connection; then when client
  4194. // does recv() it gets no data back.
  4195. do {
  4196. n = pull(NULL, conn, buf, sizeof(buf));
  4197. } while (n > 0);
  4198. #endif
  4199. // Now we know that our FIN is ACK-ed, safe to close
  4200. closesocket(conn->client.sock);
  4201. }
  4202. static void close_connection(struct mg_connection *conn) {
  4203. conn->must_close = 1;
  4204. if (conn->client.sock != INVALID_SOCKET) {
  4205. close_socket_gracefully(conn);
  4206. }
  4207. #ifndef NO_SSL
  4208. // Must be done AFTER socket is closed
  4209. if (conn->ssl != NULL) {
  4210. SSL_free(conn->ssl);
  4211. }
  4212. #endif
  4213. }
  4214. void mg_close_connection(struct mg_connection *conn) {
  4215. #ifndef NO_SSL
  4216. if (conn->client_ssl_ctx != NULL) {
  4217. SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
  4218. }
  4219. #endif
  4220. close_connection(conn);
  4221. free(conn);
  4222. }
  4223. struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
  4224. char *ebuf, size_t ebuf_len) {
  4225. static struct mg_context fake_ctx;
  4226. struct mg_connection *conn = NULL;
  4227. struct sockaddr_in sin;
  4228. struct hostent *he;
  4229. SOCKET sock;
  4230. if (host == NULL) {
  4231. snprintf(ebuf, ebuf_len, "%s", "NULL host");
  4232. } else if (use_ssl && SSLv23_client_method == NULL) {
  4233. snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
  4234. } else if ((he = gethostbyname(host)) == NULL) {
  4235. snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
  4236. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  4237. snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
  4238. } else {
  4239. sin.sin_family = AF_INET;
  4240. sin.sin_port = htons((uint16_t) port);
  4241. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  4242. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  4243. snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
  4244. host, port, strerror(ERRNO));
  4245. closesocket(sock);
  4246. } else if ((conn = (struct mg_connection *)
  4247. calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
  4248. snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
  4249. closesocket(sock);
  4250. #ifndef NO_SSL
  4251. } else if (use_ssl && (conn->client_ssl_ctx =
  4252. SSL_CTX_new(SSLv23_client_method())) == NULL) {
  4253. snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
  4254. closesocket(sock);
  4255. free(conn);
  4256. conn = NULL;
  4257. #endif // NO_SSL
  4258. } else {
  4259. conn->buf_size = MAX_REQUEST_SIZE;
  4260. conn->buf = (char *) (conn + 1);
  4261. conn->ctx = &fake_ctx;
  4262. conn->client.sock = sock;
  4263. conn->client.rsa.sin = sin;
  4264. conn->client.is_ssl = use_ssl;
  4265. #ifndef NO_SSL
  4266. if (use_ssl) {
  4267. // SSL_CTX_set_verify call is needed to switch off server certificate
  4268. // checking, which is off by default in OpenSSL and on in yaSSL.
  4269. SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
  4270. sslize(conn, conn->client_ssl_ctx, SSL_connect);
  4271. }
  4272. #endif
  4273. }
  4274. }
  4275. return conn;
  4276. }
  4277. static int is_valid_uri(const char *uri) {
  4278. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  4279. // URI can be an asterisk (*) or should start with slash.
  4280. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  4281. }
  4282. static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
  4283. const char *cl;
  4284. ebuf[0] = '\0';
  4285. reset_per_request_attributes(conn);
  4286. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  4287. &conn->data_len);
  4288. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  4289. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  4290. snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
  4291. } else if (conn->request_len <= 0) {
  4292. snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
  4293. } else if (parse_http_message(conn->buf, conn->buf_size,
  4294. &conn->request_info) <= 0) {
  4295. snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
  4296. } else {
  4297. // Request is valid
  4298. if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
  4299. conn->content_len = strtoll(cl, NULL, 10);
  4300. } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
  4301. !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
  4302. conn->content_len = -1;
  4303. } else {
  4304. conn->content_len = 0;
  4305. }
  4306. conn->birth_time = time(NULL);
  4307. }
  4308. return ebuf[0] == '\0';
  4309. }
  4310. struct mg_connection *mg_download(const char *host, int port, int use_ssl,
  4311. char *ebuf, size_t ebuf_len,
  4312. const char *fmt, ...) {
  4313. struct mg_connection *conn;
  4314. va_list ap;
  4315. va_start(ap, fmt);
  4316. ebuf[0] = '\0';
  4317. if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
  4318. } else if (mg_vprintf(conn, fmt, ap) <= 0) {
  4319. snprintf(ebuf, ebuf_len, "%s", "Error sending request");
  4320. } else {
  4321. getreq(conn, ebuf, ebuf_len);
  4322. }
  4323. if (ebuf[0] != '\0' && conn != NULL) {
  4324. mg_close_connection(conn);
  4325. conn = NULL;
  4326. }
  4327. return conn;
  4328. }
  4329. static void process_new_connection(struct mg_connection *conn) {
  4330. struct mg_request_info *ri = &conn->request_info;
  4331. int keep_alive_enabled, keep_alive, discard_len;
  4332. char ebuf[100];
  4333. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  4334. keep_alive = 0;
  4335. // Important: on new connection, reset the receiving buffer. Credit goes
  4336. // to crule42.
  4337. conn->data_len = 0;
  4338. do {
  4339. if (!getreq(conn, ebuf, sizeof(ebuf))) {
  4340. send_http_error(conn, 500, "Server Error", "%s", ebuf);
  4341. conn->must_close = 1;
  4342. } else if (!is_valid_uri(conn->request_info.uri)) {
  4343. snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
  4344. send_http_error(conn, 400, "Bad Request", "%s", ebuf);
  4345. } else if (strcmp(ri->http_version, "1.0") &&
  4346. strcmp(ri->http_version, "1.1")) {
  4347. snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
  4348. send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
  4349. }
  4350. if (ebuf[0] == '\0') {
  4351. handle_request(conn);
  4352. if (conn->ctx->callbacks.end_request != NULL) {
  4353. conn->ctx->callbacks.end_request(conn, conn->status_code);
  4354. }
  4355. log_access(conn);
  4356. }
  4357. if (ri->remote_user != NULL) {
  4358. free((void *) ri->remote_user);
  4359. ri->remote_user = NULL; // when having connections with and without auth would cause double free and then crash
  4360. }
  4361. // NOTE(lsm): order is important here. should_keep_alive() call
  4362. // is using parsed request, which will be invalid after memmove's below.
  4363. // Therefore, memorize should_keep_alive() result now for later use
  4364. // in loop exit condition.
  4365. keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
  4366. conn->content_len >= 0 && should_keep_alive(conn);
  4367. // Discard all buffered data for this request
  4368. discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
  4369. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  4370. (int) (conn->request_len + conn->content_len) : conn->data_len;
  4371. assert(discard_len >= 0);
  4372. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  4373. conn->data_len -= discard_len;
  4374. assert(conn->data_len >= 0);
  4375. assert(conn->data_len <= conn->buf_size);
  4376. } while (keep_alive);
  4377. }
  4378. // Worker threads take accepted socket from the queue
  4379. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  4380. (void) pthread_mutex_lock(&ctx->mutex);
  4381. DEBUG_TRACE(("going idle"));
  4382. // If the queue is empty, wait. We're idle at this point.
  4383. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  4384. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  4385. }
  4386. // If we're stopping, sq_head may be equal to sq_tail.
  4387. if (ctx->sq_head > ctx->sq_tail) {
  4388. // Copy socket from the queue and increment tail
  4389. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  4390. ctx->sq_tail++;
  4391. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  4392. // Wrap pointers if needed
  4393. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  4394. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  4395. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  4396. }
  4397. }
  4398. (void) pthread_cond_signal(&ctx->sq_empty);
  4399. (void) pthread_mutex_unlock(&ctx->mutex);
  4400. return !ctx->stop_flag;
  4401. }
  4402. static void *worker_thread(void *thread_func_param) {
  4403. struct mg_context *ctx = thread_func_param;
  4404. struct mg_connection *conn;
  4405. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  4406. if (conn == NULL) {
  4407. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  4408. } else {
  4409. conn->buf_size = MAX_REQUEST_SIZE;
  4410. conn->buf = (char *) (conn + 1);
  4411. conn->ctx = ctx;
  4412. conn->request_info.user_data = ctx->user_data;
  4413. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  4414. // sq_empty condvar to wake up the master waiting in produce_socket()
  4415. while (consume_socket(ctx, &conn->client)) {
  4416. conn->birth_time = time(NULL);
  4417. // Fill in IP, port info early so even if SSL setup below fails,
  4418. // error handler would have the corresponding info.
  4419. // Thanks to Johannes Winkelmann for the patch.
  4420. // TODO(lsm): Fix IPv6 case
  4421. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  4422. memcpy(&conn->request_info.remote_ip,
  4423. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  4424. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  4425. conn->request_info.is_ssl = conn->client.is_ssl;
  4426. if (!conn->client.is_ssl
  4427. #ifndef NO_SSL
  4428. || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
  4429. #endif
  4430. ) {
  4431. process_new_connection(conn);
  4432. }
  4433. close_connection(conn);
  4434. }
  4435. free(conn);
  4436. }
  4437. // Signal master that we're done with connection and exiting
  4438. (void) pthread_mutex_lock(&ctx->mutex);
  4439. ctx->num_threads--;
  4440. (void) pthread_cond_signal(&ctx->cond);
  4441. assert(ctx->num_threads >= 0);
  4442. (void) pthread_mutex_unlock(&ctx->mutex);
  4443. DEBUG_TRACE(("exiting"));
  4444. return NULL;
  4445. }
  4446. // Master thread adds accepted socket to a queue
  4447. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  4448. (void) pthread_mutex_lock(&ctx->mutex);
  4449. // If the queue is full, wait
  4450. while (ctx->stop_flag == 0 &&
  4451. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  4452. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  4453. }
  4454. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  4455. // Copy socket to the queue and increment head
  4456. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  4457. ctx->sq_head++;
  4458. DEBUG_TRACE(("queued socket %d", sp->sock));
  4459. }
  4460. (void) pthread_cond_signal(&ctx->sq_full);
  4461. (void) pthread_mutex_unlock(&ctx->mutex);
  4462. }
  4463. static int set_sock_timeout(SOCKET sock, int milliseconds) {
  4464. #ifdef _WIN32
  4465. DWORD t = milliseconds;
  4466. #else
  4467. struct timeval t;
  4468. t.tv_sec = milliseconds / 1000;
  4469. t.tv_usec = (milliseconds * 1000) % 1000000;
  4470. #endif
  4471. return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
  4472. setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
  4473. }
  4474. static void accept_new_connection(const struct socket *listener,
  4475. struct mg_context *ctx) {
  4476. struct socket so;
  4477. char src_addr[20];
  4478. socklen_t len = sizeof(so.rsa);
  4479. int on = 1;
  4480. if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
  4481. } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
  4482. sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
  4483. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  4484. closesocket(so.sock);
  4485. } else {
  4486. // Put so socket structure into the queue
  4487. DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
  4488. so.is_ssl = listener->is_ssl;
  4489. so.ssl_redir = listener->ssl_redir;
  4490. getsockname(so.sock, &so.lsa.sa, &len);
  4491. // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
  4492. // is enabled, and client resets the connection, server won't get
  4493. // TCP FIN or RST and will keep the connection open forever. With TCP
  4494. // keep-alive, next keep-alive handshake will figure out that the client
  4495. // is down and will close the server end.
  4496. // Thanks to Igor Klopov who suggested the patch.
  4497. setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
  4498. set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
  4499. produce_socket(ctx, &so);
  4500. }
  4501. }
  4502. static void *master_thread(void *thread_func_param) {
  4503. struct mg_context *ctx = thread_func_param;
  4504. struct pollfd *pfd;
  4505. int i;
  4506. // Increase priority of the master thread
  4507. #if defined(_WIN32)
  4508. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  4509. #endif
  4510. #if defined(ISSUE_317)
  4511. struct sched_param sched_param;
  4512. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  4513. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  4514. #endif
  4515. pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
  4516. while (ctx->stop_flag == 0) {
  4517. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4518. pfd[i].fd = ctx->listening_sockets[i].sock;
  4519. pfd[i].events = POLLIN;
  4520. }
  4521. if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
  4522. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4523. // NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
  4524. // successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
  4525. // Therefore, we're checking pfd[i].revents & POLLIN, not
  4526. // pfd[i].revents == POLLIN.
  4527. if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
  4528. accept_new_connection(&ctx->listening_sockets[i], ctx);
  4529. }
  4530. }
  4531. }
  4532. }
  4533. free(pfd);
  4534. DEBUG_TRACE(("stopping workers"));
  4535. // Stop signal received: somebody called mg_stop. Quit.
  4536. close_all_listening_sockets(ctx);
  4537. // Wakeup workers that are waiting for connections to handle.
  4538. pthread_cond_broadcast(&ctx->sq_full);
  4539. // Wait until all threads finish
  4540. (void) pthread_mutex_lock(&ctx->mutex);
  4541. while (ctx->num_threads > 0) {
  4542. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4543. }
  4544. (void) pthread_mutex_unlock(&ctx->mutex);
  4545. // All threads exited, no sync is needed. Destroy mutex and condvars
  4546. (void) pthread_mutex_destroy(&ctx->mutex);
  4547. (void) pthread_cond_destroy(&ctx->cond);
  4548. (void) pthread_cond_destroy(&ctx->sq_empty);
  4549. (void) pthread_cond_destroy(&ctx->sq_full);
  4550. #if !defined(NO_SSL)
  4551. uninitialize_ssl(ctx);
  4552. #endif
  4553. DEBUG_TRACE(("exiting"));
  4554. // Signal mg_stop() that we're done.
  4555. // WARNING: This must be the very last thing this
  4556. // thread does, as ctx becomes invalid after this line.
  4557. ctx->stop_flag = 2;
  4558. return NULL;
  4559. }
  4560. static void free_context(struct mg_context *ctx) {
  4561. int i;
  4562. // Deallocate config parameters
  4563. for (i = 0; i < NUM_OPTIONS; i++) {
  4564. if (ctx->config[i] != NULL)
  4565. free(ctx->config[i]);
  4566. }
  4567. #ifndef NO_SSL
  4568. // Deallocate SSL context
  4569. if (ctx->ssl_ctx != NULL) {
  4570. SSL_CTX_free(ctx->ssl_ctx);
  4571. }
  4572. if (ssl_mutexes != NULL) {
  4573. free(ssl_mutexes);
  4574. ssl_mutexes = NULL;
  4575. }
  4576. #endif // !NO_SSL
  4577. // Deallocate context itself
  4578. free(ctx);
  4579. }
  4580. void mg_stop(struct mg_context *ctx) {
  4581. ctx->stop_flag = 1;
  4582. // Wait until mg_fini() stops
  4583. while (ctx->stop_flag != 2) {
  4584. (void) mg_sleep(10);
  4585. }
  4586. free_context(ctx);
  4587. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4588. (void) WSACleanup();
  4589. #endif // _WIN32
  4590. }
  4591. struct mg_context *mg_start(const struct mg_callbacks *callbacks,
  4592. void *user_data,
  4593. const char **options) {
  4594. struct mg_context *ctx;
  4595. const char *name, *value, *default_value;
  4596. int i;
  4597. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4598. WSADATA data;
  4599. WSAStartup(MAKEWORD(2,2), &data);
  4600. InitializeCriticalSection(&global_log_file_lock);
  4601. #endif // _WIN32
  4602. // Allocate context and initialize reasonable general case defaults.
  4603. // TODO(lsm): do proper error handling here.
  4604. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4605. return NULL;
  4606. }
  4607. ctx->callbacks = *callbacks;
  4608. ctx->user_data = user_data;
  4609. while (options && (name = *options++) != NULL) {
  4610. if ((i = get_option_index(name)) == -1) {
  4611. cry(fc(ctx), "Invalid option: %s", name);
  4612. free_context(ctx);
  4613. return NULL;
  4614. } else if ((value = *options++) == NULL) {
  4615. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4616. free_context(ctx);
  4617. return NULL;
  4618. }
  4619. if (ctx->config[i] != NULL) {
  4620. cry(fc(ctx), "warning: %s: duplicate option", name);
  4621. free(ctx->config[i]);
  4622. }
  4623. ctx->config[i] = mg_strdup(value);
  4624. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4625. }
  4626. // Set default value if needed
  4627. for (i = 0; config_options[i * 2] != NULL; i++) {
  4628. default_value = config_options[i * 2 + 1];
  4629. if (ctx->config[i] == NULL && default_value != NULL) {
  4630. ctx->config[i] = mg_strdup(default_value);
  4631. }
  4632. }
  4633. // NOTE(lsm): order is important here. SSL certificates must
  4634. // be initialized before listening ports. UID must be set last.
  4635. if (!set_gpass_option(ctx) ||
  4636. #if !defined(NO_SSL)
  4637. !set_ssl_option(ctx) ||
  4638. #endif
  4639. !set_ports_option(ctx) ||
  4640. #if !defined(_WIN32)
  4641. !set_uid_option(ctx) ||
  4642. #endif
  4643. !set_acl_option(ctx)) {
  4644. free_context(ctx);
  4645. return NULL;
  4646. }
  4647. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4648. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4649. // won't kill the whole process.
  4650. (void) signal(SIGPIPE, SIG_IGN);
  4651. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4652. (void) signal(SIGCHLD, SIG_IGN);
  4653. #endif // !_WIN32
  4654. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4655. (void) pthread_cond_init(&ctx->cond, NULL);
  4656. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4657. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4658. // Start master (listening) thread
  4659. mg_start_thread(master_thread, ctx);
  4660. // Start worker threads
  4661. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4662. if (mg_start_thread(worker_thread, ctx) != 0) {
  4663. cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
  4664. } else {
  4665. ctx->num_threads++;
  4666. }
  4667. }
  4668. return ctx;
  4669. }