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. #define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
  22. #else
  23. #ifdef __linux__
  24. #define _XOPEN_SOURCE 600 // For flockfile() on Linux
  25. #endif
  26. #define _LARGEFILE_SOURCE // Enable 64-bit file offsets
  27. #define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
  28. #define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
  29. #endif
  30. #if defined (_MSC_VER)
  31. // conditional expression is constant: introduced by FD_SET(..)
  32. #pragma warning (disable : 4127)
  33. // non-constant aggregate initializer: issued due to missing C99 support
  34. #pragma warning (disable : 4204)
  35. #endif
  36. // Disable WIN32_LEAN_AND_MEAN.
  37. // This makes windows.h always include winsock2.h
  38. #ifdef WIN32_LEAN_AND_MEAN
  39. #undef WIN32_LEAN_AND_MEAN
  40. #endif
  41. #if defined(__SYMBIAN32__)
  42. #define NO_SSL // SSL is not supported
  43. #define NO_CGI // CGI is not supported
  44. #define PATH_MAX FILENAME_MAX
  45. #endif // __SYMBIAN32__
  46. #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
  47. #include <sys/types.h>
  48. #include <sys/stat.h>
  49. #include <errno.h>
  50. #include <signal.h>
  51. #include <fcntl.h>
  52. #endif // !_WIN32_WCE
  53. #include <time.h>
  54. #include <stdlib.h>
  55. #include <stdarg.h>
  56. #include <assert.h>
  57. #include <string.h>
  58. #include <ctype.h>
  59. #include <limits.h>
  60. #include <stddef.h>
  61. #include <stdio.h>
  62. #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
  63. #undef _WIN32_WINNT
  64. #define _WIN32_WINNT 0x0400 // To make it link in VS2005
  65. #include <windows.h>
  66. #ifndef PATH_MAX
  67. #define PATH_MAX MAX_PATH
  68. #endif
  69. #ifndef _WIN32_WCE
  70. #include <process.h>
  71. #include <direct.h>
  72. #include <io.h>
  73. #else // _WIN32_WCE
  74. #define NO_CGI // WinCE has no pipes
  75. typedef long off_t;
  76. #define errno GetLastError()
  77. #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
  78. #endif // _WIN32_WCE
  79. #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
  80. ((uint64_t)((uint32_t)(hi))) << 32))
  81. #define RATE_DIFF 10000000 // 100 nsecs
  82. #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
  83. #define SYS2UNIX_TIME(lo, hi) \
  84. (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
  85. // Visual Studio 6 does not know __func__ or __FUNCTION__
  86. // The rest of MS compilers use __FUNCTION__, not C99 __func__
  87. // Also use _strtoui64 on modern M$ compilers
  88. #if defined(_MSC_VER) && _MSC_VER < 1300
  89. #define STRX(x) #x
  90. #define STR(x) STRX(x)
  91. #define __func__ __FILE__ ":" STR(__LINE__)
  92. #define strtoull(x, y, z) strtoul(x, y, z)
  93. #define strtoll(x, y, z) strtol(x, y, z)
  94. #else
  95. #define __func__ __FUNCTION__
  96. #define strtoull(x, y, z) _strtoui64(x, y, z)
  97. #define strtoll(x, y, z) _strtoi64(x, y, z)
  98. #endif // _MSC_VER
  99. #define ERRNO GetLastError()
  100. #define NO_SOCKLEN_T
  101. #define SSL_LIB "ssleay32.dll"
  102. #define CRYPTO_LIB "libeay32.dll"
  103. #define O_NONBLOCK 0
  104. #if !defined(EWOULDBLOCK)
  105. #define EWOULDBLOCK WSAEWOULDBLOCK
  106. #endif // !EWOULDBLOCK
  107. #define _POSIX_
  108. #define INT64_FMT "I64d"
  109. #define WINCDECL __cdecl
  110. #define SHUT_WR 1
  111. #define snprintf _snprintf
  112. #define vsnprintf _vsnprintf
  113. #define mg_sleep(x) Sleep(x)
  114. #define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
  115. #ifndef popen
  116. #define popen(x, y) _popen(x, y)
  117. #endif
  118. #ifndef pclose
  119. #define pclose(x) _pclose(x)
  120. #endif
  121. #define close(x) _close(x)
  122. #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
  123. #define RTLD_LAZY 0
  124. #define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
  125. #define fdopen(x, y) _fdopen((x), (y))
  126. #define write(x, y, z) _write((x), (y), (unsigned) z)
  127. #define read(x, y, z) _read((x), (y), (unsigned) z)
  128. #define flockfile(x) EnterCriticalSection(&global_log_file_lock)
  129. #define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
  130. #define sleep(x) Sleep((x) * 1000)
  131. #if !defined(va_copy)
  132. #define va_copy(x, y) x = y
  133. #endif // !va_copy MINGW #defines va_copy
  134. #if !defined(fileno)
  135. #define fileno(x) _fileno(x)
  136. #endif // !fileno MINGW #defines fileno
  137. typedef HANDLE pthread_mutex_t;
  138. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  139. typedef DWORD pthread_t;
  140. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  141. static int pthread_mutex_lock(pthread_mutex_t *);
  142. static int pthread_mutex_unlock(pthread_mutex_t *);
  143. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
  144. struct file;
  145. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
  146. #if defined(HAVE_STDINT)
  147. #include <stdint.h>
  148. #else
  149. typedef unsigned int uint32_t;
  150. typedef unsigned short uint16_t;
  151. typedef unsigned __int64 uint64_t;
  152. typedef __int64 int64_t;
  153. #define INT64_MAX 9223372036854775807
  154. #endif // HAVE_STDINT
  155. // POSIX dirent interface
  156. struct dirent {
  157. char d_name[PATH_MAX];
  158. };
  159. typedef struct DIR {
  160. HANDLE handle;
  161. WIN32_FIND_DATAW info;
  162. struct dirent result;
  163. } DIR;
  164. #ifndef HAS_POLL
  165. struct pollfd {
  166. int fd;
  167. short events;
  168. short revents;
  169. };
  170. #define POLLIN 1
  171. #endif
  172. // Mark required libraries
  173. #ifdef _MSC_VER
  174. #pragma comment(lib, "Ws2_32.lib")
  175. #endif
  176. #else // UNIX specific
  177. #include <sys/wait.h>
  178. #include <sys/socket.h>
  179. #include <sys/poll.h>
  180. #include <netinet/in.h>
  181. #include <arpa/inet.h>
  182. #include <sys/time.h>
  183. #include <stdint.h>
  184. #include <inttypes.h>
  185. #include <netdb.h>
  186. #include <pwd.h>
  187. #include <unistd.h>
  188. #include <dirent.h>
  189. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  190. #include <dlfcn.h>
  191. #endif
  192. #include <pthread.h>
  193. #if defined(__MACH__)
  194. #define SSL_LIB "libssl.dylib"
  195. #define CRYPTO_LIB "libcrypto.dylib"
  196. #else
  197. #if !defined(SSL_LIB)
  198. #define SSL_LIB "libssl.so"
  199. #endif
  200. #if !defined(CRYPTO_LIB)
  201. #define CRYPTO_LIB "libcrypto.so"
  202. #endif
  203. #endif
  204. #ifndef O_BINARY
  205. #define O_BINARY 0
  206. #endif // O_BINARY
  207. #define closesocket(a) close(a)
  208. #define mg_mkdir(x, y) mkdir(x, y)
  209. #define mg_remove(x) remove(x)
  210. #define mg_sleep(x) usleep((x) * 1000)
  211. #define ERRNO errno
  212. #define INVALID_SOCKET (-1)
  213. #define INT64_FMT PRId64
  214. typedef int SOCKET;
  215. #define WINCDECL
  216. #endif // End of Windows and UNIX specific includes
  217. #include "mongoose.h"
  218. #ifdef USE_LUA
  219. #include <lua.h>
  220. #include <lauxlib.h>
  221. #endif
  222. #define MONGOOSE_VERSION "3.8"
  223. #define PASSWORDS_FILE_NAME ".htpasswd"
  224. #define CGI_ENVIRONMENT_SIZE 4096
  225. #define MAX_CGI_ENVIR_VARS 64
  226. #define MG_BUF_LEN 8192
  227. #define MAX_REQUEST_SIZE 16384
  228. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  229. #ifdef _WIN32
  230. static CRITICAL_SECTION global_log_file_lock;
  231. static pthread_t pthread_self(void) {
  232. return GetCurrentThreadId();
  233. }
  234. #endif // _WIN32
  235. #ifdef DEBUG_TRACE
  236. #undef DEBUG_TRACE
  237. #define DEBUG_TRACE(x)
  238. #else
  239. #if defined(DEBUG)
  240. #define DEBUG_TRACE(x) do { \
  241. flockfile(stdout); \
  242. printf("*** %lu.%p.%s.%d: ", \
  243. (unsigned long) time(NULL), (void *) pthread_self(), \
  244. __func__, __LINE__); \
  245. printf x; \
  246. putchar('\n'); \
  247. fflush(stdout); \
  248. funlockfile(stdout); \
  249. } while (0)
  250. #else
  251. #define DEBUG_TRACE(x)
  252. #endif // DEBUG
  253. #endif // DEBUG_TRACE
  254. // Darwin prior to 7.0 and Win32 do not have socklen_t
  255. #ifdef NO_SOCKLEN_T
  256. typedef int socklen_t;
  257. #endif // NO_SOCKLEN_T
  258. #define _DARWIN_UNLIMITED_SELECT
  259. #if !defined(MSG_NOSIGNAL)
  260. #define MSG_NOSIGNAL 0
  261. #endif
  262. #if !defined(SOMAXCONN)
  263. #define SOMAXCONN 100
  264. #endif
  265. #if !defined(PATH_MAX)
  266. #define PATH_MAX 4096
  267. #endif
  268. static const char *http_500_error = "Internal Server Error";
  269. #if defined(NO_SSL_DL)
  270. #include <openssl/ssl.h>
  271. #else
  272. // SSL loaded dynamically from DLL.
  273. // I put the prototypes here to be independent from OpenSSL source installation.
  274. typedef struct ssl_st SSL;
  275. typedef struct ssl_method_st SSL_METHOD;
  276. typedef struct ssl_ctx_st SSL_CTX;
  277. struct ssl_func {
  278. const char *name; // SSL function name
  279. void (*ptr)(void); // Function pointer
  280. };
  281. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  282. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  283. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  284. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  285. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  286. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  287. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  288. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  289. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  290. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  291. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  292. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  293. const char *, int)) ssl_sw[11].ptr)
  294. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  295. const char *, int)) ssl_sw[12].ptr)
  296. #define SSL_CTX_set_default_passwd_cb \
  297. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  298. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  299. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  300. #define SSL_CTX_use_certificate_chain_file \
  301. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  302. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  303. #define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
  304. #define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
  305. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  306. #define CRYPTO_set_locking_callback \
  307. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  308. #define CRYPTO_set_id_callback \
  309. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  310. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  311. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  312. // set_ssl_option() function updates this array.
  313. // It loads SSL library dynamically and changes NULLs to the actual addresses
  314. // of respective functions. The macros above (like SSL_connect()) are really
  315. // just calling these functions indirectly via the pointer.
  316. static struct ssl_func ssl_sw[] = {
  317. {"SSL_free", NULL},
  318. {"SSL_accept", NULL},
  319. {"SSL_connect", NULL},
  320. {"SSL_read", NULL},
  321. {"SSL_write", NULL},
  322. {"SSL_get_error", NULL},
  323. {"SSL_set_fd", NULL},
  324. {"SSL_new", NULL},
  325. {"SSL_CTX_new", NULL},
  326. {"SSLv23_server_method", NULL},
  327. {"SSL_library_init", NULL},
  328. {"SSL_CTX_use_PrivateKey_file", NULL},
  329. {"SSL_CTX_use_certificate_file",NULL},
  330. {"SSL_CTX_set_default_passwd_cb",NULL},
  331. {"SSL_CTX_free", NULL},
  332. {"SSL_load_error_strings", NULL},
  333. {"SSL_CTX_use_certificate_chain_file", NULL},
  334. {"SSLv23_client_method", NULL},
  335. {"SSL_pending", NULL},
  336. {"SSL_CTX_set_verify", NULL},
  337. {NULL, NULL}
  338. };
  339. // Similar array as ssl_sw. These functions could be located in different lib.
  340. #if !defined(NO_SSL)
  341. static struct ssl_func crypto_sw[] = {
  342. {"CRYPTO_num_locks", NULL},
  343. {"CRYPTO_set_locking_callback", NULL},
  344. {"CRYPTO_set_id_callback", NULL},
  345. {"ERR_get_error", NULL},
  346. {"ERR_error_string", NULL},
  347. {NULL, NULL}
  348. };
  349. #endif // NO_SSL
  350. #endif // NO_SSL_DL
  351. static const char *month_names[] = {
  352. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  353. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  354. };
  355. // Unified socket address. For IPv6 support, add IPv6 address structure
  356. // in the union u.
  357. union usa {
  358. struct sockaddr sa;
  359. struct sockaddr_in sin;
  360. #if defined(USE_IPV6)
  361. struct sockaddr_in6 sin6;
  362. #endif
  363. };
  364. // Describes a string (chunk of memory).
  365. struct vec {
  366. const char *ptr;
  367. size_t len;
  368. };
  369. struct file {
  370. int is_directory;
  371. time_t modification_time;
  372. int64_t size;
  373. FILE *fp;
  374. const char *membuf; // Non-NULL if file data is in memory
  375. };
  376. #define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
  377. // Describes listening socket, or socket which was accept()-ed by the master
  378. // thread and queued for future handling by the worker thread.
  379. struct socket {
  380. SOCKET sock; // Listening socket
  381. union usa lsa; // Local socket address
  382. union usa rsa; // Remote socket address
  383. unsigned is_ssl:1; // Is port SSL-ed
  384. unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
  385. };
  386. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  387. enum {
  388. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  389. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  390. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  391. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  392. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  393. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
  394. NUM_OPTIONS
  395. };
  396. static const char *config_options[] = {
  397. "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  398. "cgi_environment", NULL,
  399. "put_delete_auth_file", NULL,
  400. "cgi_interpreter", NULL,
  401. "protect_uri", NULL,
  402. "authentication_domain", "mydomain.com",
  403. "ssi_pattern", "**.shtml$|**.shtm$",
  404. "throttle", NULL,
  405. "access_log_file", NULL,
  406. "enable_directory_listing", "yes",
  407. "error_log_file", NULL,
  408. "global_auth_file", NULL,
  409. "index_files",
  410. "index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
  411. "enable_keep_alive", "no",
  412. "access_control_list", NULL,
  413. "extra_mime_types", NULL,
  414. "listening_ports", "8080",
  415. "document_root", ".",
  416. "ssl_certificate", NULL,
  417. "num_threads", "50",
  418. "run_as_user", NULL,
  419. "url_rewrite_patterns", NULL,
  420. "hide_files_patterns", NULL,
  421. "request_timeout_ms", "30000",
  422. NULL
  423. };
  424. struct mg_context {
  425. volatile int stop_flag; // Should we stop event loop
  426. SSL_CTX *ssl_ctx; // SSL context
  427. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  428. struct mg_callbacks callbacks; // User-defined callback function
  429. void *user_data; // User-defined data
  430. struct socket *listening_sockets;
  431. int num_listening_sockets;
  432. volatile int num_threads; // Number of threads
  433. pthread_mutex_t mutex; // Protects (max|num)_threads
  434. pthread_cond_t cond; // Condvar for tracking workers terminations
  435. struct socket queue[20]; // Accepted sockets
  436. volatile int sq_head; // Head of the socket queue
  437. volatile int sq_tail; // Tail of the socket queue
  438. pthread_cond_t sq_full; // Signaled when socket is produced
  439. pthread_cond_t sq_empty; // Signaled when socket is consumed
  440. };
  441. struct mg_connection {
  442. struct mg_request_info request_info;
  443. struct mg_context *ctx;
  444. SSL *ssl; // SSL descriptor
  445. SSL_CTX *client_ssl_ctx; // SSL context for client connections
  446. struct socket client; // Connected client
  447. time_t birth_time; // Time when request was received
  448. int64_t num_bytes_sent; // Total bytes sent to client
  449. int64_t content_len; // Content-Length header value
  450. int64_t consumed_content; // How many bytes of content have been read
  451. char *buf; // Buffer for received data
  452. char *path_info; // PATH_INFO part of the URL
  453. int must_close; // 1 if connection must be closed
  454. int buf_size; // Buffer size
  455. int request_len; // Size of the request + headers in a buffer
  456. int data_len; // Total size of data in a buffer
  457. int status_code; // HTTP reply status code, e.g. 200
  458. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  459. time_t last_throttle_time; // Last time throttled data was sent
  460. int64_t last_throttle_bytes;// Bytes sent this second
  461. };
  462. const char **mg_get_valid_option_names(void) {
  463. return config_options;
  464. }
  465. static int is_file_in_memory(struct mg_connection *conn, const char *path,
  466. struct file *filep) {
  467. size_t size = 0;
  468. if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
  469. conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
  470. // NOTE: override filep->size only on success. Otherwise, it might break
  471. // constructs like if (!mg_stat() || !mg_fopen()) ...
  472. filep->size = size;
  473. }
  474. return filep->membuf != NULL;
  475. }
  476. static int is_file_opened(const struct file *filep) {
  477. return filep->membuf != NULL || filep->fp != NULL;
  478. }
  479. static int mg_fopen(struct mg_connection *conn, const char *path,
  480. const char *mode, struct file *filep) {
  481. if (!is_file_in_memory(conn, path, filep)) {
  482. #ifdef _WIN32
  483. wchar_t wbuf[PATH_MAX], wmode[20];
  484. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  485. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  486. filep->fp = _wfopen(wbuf, wmode);
  487. #else
  488. filep->fp = fopen(path, mode);
  489. #endif
  490. }
  491. return is_file_opened(filep);
  492. }
  493. static void mg_fclose(struct file *filep) {
  494. if (filep != NULL && filep->fp != NULL) {
  495. fclose(filep->fp);
  496. }
  497. }
  498. static int get_option_index(const char *name) {
  499. int i;
  500. for (i = 0; config_options[i * 2] != NULL; i++) {
  501. if (strcmp(config_options[i * 2], name) == 0) {
  502. return i;
  503. }
  504. }
  505. return -1;
  506. }
  507. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  508. int i;
  509. if ((i = get_option_index(name)) == -1) {
  510. return NULL;
  511. } else if (ctx->config[i] == NULL) {
  512. return "";
  513. } else {
  514. return ctx->config[i];
  515. }
  516. }
  517. static void sockaddr_to_string(char *buf, size_t len,
  518. const union usa *usa) {
  519. buf[0] = '\0';
  520. #if defined(USE_IPV6)
  521. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  522. (void *) &usa->sin.sin_addr :
  523. (void *) &usa->sin6.sin6_addr, buf, len);
  524. #elif defined(_WIN32)
  525. // Only Windoze Vista (and newer) have inet_ntop()
  526. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  527. #else
  528. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  529. #endif
  530. }
  531. static void cry(struct mg_connection *conn,
  532. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  533. // Print error message to the opened error log stream.
  534. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  535. char buf[MG_BUF_LEN], src_addr[20];
  536. va_list ap;
  537. FILE *fp;
  538. time_t timestamp;
  539. va_start(ap, fmt);
  540. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  541. va_end(ap);
  542. // Do not lock when getting the callback value, here and below.
  543. // I suppose this is fine, since function cannot disappear in the
  544. // same way string option can.
  545. if (conn->ctx->callbacks.log_message == NULL ||
  546. conn->ctx->callbacks.log_message(conn, buf) == 0) {
  547. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  548. fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  549. if (fp != NULL) {
  550. flockfile(fp);
  551. timestamp = time(NULL);
  552. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  553. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  554. src_addr);
  555. if (conn->request_info.request_method != NULL) {
  556. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  557. conn->request_info.uri);
  558. }
  559. fprintf(fp, "%s", buf);
  560. fputc('\n', fp);
  561. funlockfile(fp);
  562. fclose(fp);
  563. }
  564. }
  565. }
  566. // Return fake connection structure. Used for logging, if connection
  567. // is not applicable at the moment of logging.
  568. static struct mg_connection *fc(struct mg_context *ctx) {
  569. static struct mg_connection fake_connection;
  570. fake_connection.ctx = ctx;
  571. return &fake_connection;
  572. }
  573. const char *mg_version(void) {
  574. return MONGOOSE_VERSION;
  575. }
  576. struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
  577. return &conn->request_info;
  578. }
  579. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  580. for (; *src != '\0' && n > 1; n--) {
  581. *dst++ = *src++;
  582. }
  583. *dst = '\0';
  584. }
  585. static int lowercase(const char *s) {
  586. return tolower(* (const unsigned char *) s);
  587. }
  588. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  589. int diff = 0;
  590. if (len > 0)
  591. do {
  592. diff = lowercase(s1++) - lowercase(s2++);
  593. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  594. return diff;
  595. }
  596. static int mg_strcasecmp(const char *s1, const char *s2) {
  597. int diff;
  598. do {
  599. diff = lowercase(s1++) - lowercase(s2++);
  600. } while (diff == 0 && s1[-1] != '\0');
  601. return diff;
  602. }
  603. static char * mg_strndup(const char *ptr, size_t len) {
  604. char *p;
  605. if ((p = (char *) malloc(len + 1)) != NULL) {
  606. mg_strlcpy(p, ptr, len + 1);
  607. }
  608. return p;
  609. }
  610. static char * mg_strdup(const char *str) {
  611. return mg_strndup(str, strlen(str));
  612. }
  613. static const char *mg_strcasestr(const char *big_str, const char *small_str) {
  614. int i, big_len = strlen(big_str), small_len = strlen(small_str);
  615. for (i = 0; i <= big_len - small_len; i++) {
  616. if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
  617. return big_str + i;
  618. }
  619. }
  620. return NULL;
  621. }
  622. // Like snprintf(), but never returns negative value, or a value
  623. // that is larger than a supplied buffer.
  624. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  625. // in his audit report.
  626. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  627. const char *fmt, va_list ap) {
  628. int n;
  629. if (buflen == 0)
  630. return 0;
  631. n = vsnprintf(buf, buflen, fmt, ap);
  632. if (n < 0) {
  633. cry(conn, "vsnprintf error");
  634. n = 0;
  635. } else if (n >= (int) buflen) {
  636. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  637. n > 200 ? 200 : n, buf);
  638. n = (int) buflen - 1;
  639. }
  640. buf[n] = '\0';
  641. return n;
  642. }
  643. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  644. PRINTF_FORMAT_STRING(const char *fmt), ...)
  645. PRINTF_ARGS(4, 5);
  646. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  647. const char *fmt, ...) {
  648. va_list ap;
  649. int n;
  650. va_start(ap, fmt);
  651. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  652. va_end(ap);
  653. return n;
  654. }
  655. // Skip the characters until one of the delimiters characters found.
  656. // 0-terminate resulting word. Skip the delimiter and following whitespaces.
  657. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  658. // Delimiters can be quoted with quotechar.
  659. static char *skip_quoted(char **buf, const char *delimiters,
  660. const char *whitespace, char quotechar) {
  661. char *p, *begin_word, *end_word, *end_whitespace;
  662. begin_word = *buf;
  663. end_word = begin_word + strcspn(begin_word, delimiters);
  664. // Check for quotechar
  665. if (end_word > begin_word) {
  666. p = end_word - 1;
  667. while (*p == quotechar) {
  668. // If there is anything beyond end_word, copy it
  669. if (*end_word == '\0') {
  670. *p = '\0';
  671. break;
  672. } else {
  673. size_t end_off = strcspn(end_word + 1, delimiters);
  674. memmove (p, end_word, end_off + 1);
  675. p += end_off; // p must correspond to end_word - 1
  676. end_word += end_off + 1;
  677. }
  678. }
  679. for (p++; p < end_word; p++) {
  680. *p = '\0';
  681. }
  682. }
  683. if (*end_word == '\0') {
  684. *buf = end_word;
  685. } else {
  686. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  687. for (p = end_word; p < end_whitespace; p++) {
  688. *p = '\0';
  689. }
  690. *buf = end_whitespace;
  691. }
  692. return begin_word;
  693. }
  694. // Simplified version of skip_quoted without quote char
  695. // and whitespace == delimiters
  696. static char *skip(char **buf, const char *delimiters) {
  697. return skip_quoted(buf, delimiters, delimiters, 0);
  698. }
  699. // Return HTTP header value, or NULL if not found.
  700. static const char *get_header(const struct mg_request_info *ri,
  701. const char *name) {
  702. int i;
  703. for (i = 0; i < ri->num_headers; i++)
  704. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  705. return ri->http_headers[i].value;
  706. return NULL;
  707. }
  708. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  709. return get_header(&conn->request_info, name);
  710. }
  711. // A helper function for traversing a comma separated list of values.
  712. // It returns a list pointer shifted to the next value, or NULL if the end
  713. // of the list found.
  714. // Value is stored in val vector. If value has form "x=y", then eq_val
  715. // vector is initialized to point to the "y" part, and val vector length
  716. // is adjusted to point only to "x".
  717. static const char *next_option(const char *list, struct vec *val,
  718. struct vec *eq_val) {
  719. if (list == NULL || *list == '\0') {
  720. // End of the list
  721. list = NULL;
  722. } else {
  723. val->ptr = list;
  724. if ((list = strchr(val->ptr, ',')) != NULL) {
  725. // Comma found. Store length and shift the list ptr
  726. val->len = list - val->ptr;
  727. list++;
  728. } else {
  729. // This value is the last one
  730. list = val->ptr + strlen(val->ptr);
  731. val->len = list - val->ptr;
  732. }
  733. if (eq_val != NULL) {
  734. // Value has form "x=y", adjust pointers and lengths
  735. // so that val points to "x", and eq_val points to "y".
  736. eq_val->len = 0;
  737. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  738. if (eq_val->ptr != NULL) {
  739. eq_val->ptr++; // Skip over '=' character
  740. eq_val->len = val->ptr + val->len - eq_val->ptr;
  741. val->len = (eq_val->ptr - val->ptr) - 1;
  742. }
  743. }
  744. }
  745. return list;
  746. }
  747. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  748. const char *or_str;
  749. int i, j, len, res;
  750. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  751. res = match_prefix(pattern, or_str - pattern, str);
  752. return res > 0 ? res :
  753. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  754. }
  755. i = j = 0;
  756. res = -1;
  757. for (; i < pattern_len; i++, j++) {
  758. if (pattern[i] == '?' && str[j] != '\0') {
  759. continue;
  760. } else if (pattern[i] == '$') {
  761. return str[j] == '\0' ? j : -1;
  762. } else if (pattern[i] == '*') {
  763. i++;
  764. if (pattern[i] == '*') {
  765. i++;
  766. len = (int) strlen(str + j);
  767. } else {
  768. len = (int) strcspn(str + j, "/");
  769. }
  770. if (i == pattern_len) {
  771. return j + len;
  772. }
  773. do {
  774. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  775. } while (res == -1 && len-- > 0);
  776. return res == -1 ? -1 : j + res + len;
  777. } else if (pattern[i] != str[j]) {
  778. return -1;
  779. }
  780. }
  781. return j;
  782. }
  783. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  784. // This function must tolerate situations when connection info is not
  785. // set up, for example if request parsing failed.
  786. static int should_keep_alive(const struct mg_connection *conn) {
  787. const char *http_version = conn->request_info.http_version;
  788. const char *header = mg_get_header(conn, "Connection");
  789. if (conn->must_close ||
  790. conn->status_code == 401 ||
  791. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  792. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  793. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  794. return 0;
  795. }
  796. return 1;
  797. }
  798. static const char *suggest_connection_header(const struct mg_connection *conn) {
  799. return should_keep_alive(conn) ? "keep-alive" : "close";
  800. }
  801. static void send_http_error(struct mg_connection *, int, const char *,
  802. PRINTF_FORMAT_STRING(const char *fmt), ...)
  803. PRINTF_ARGS(4, 5);
  804. static void send_http_error(struct mg_connection *conn, int status,
  805. const char *reason, const char *fmt, ...) {
  806. char buf[MG_BUF_LEN];
  807. va_list ap;
  808. int len = 0;
  809. conn->status_code = status;
  810. if (conn->ctx->callbacks.http_error == NULL ||
  811. conn->ctx->callbacks.http_error(conn, status)) {
  812. buf[0] = '\0';
  813. // Errors 1xx, 204 and 304 MUST NOT send a body
  814. if (status > 199 && status != 204 && status != 304) {
  815. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  816. buf[len++] = '\n';
  817. va_start(ap, fmt);
  818. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  819. va_end(ap);
  820. }
  821. DEBUG_TRACE(("[%s]", buf));
  822. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  823. "Content-Length: %d\r\n"
  824. "Connection: %s\r\n\r\n", status, reason, len,
  825. suggest_connection_header(conn));
  826. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  827. }
  828. }
  829. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  830. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  831. (void) unused;
  832. *mutex = CreateMutex(NULL, FALSE, NULL);
  833. return *mutex == NULL ? -1 : 0;
  834. }
  835. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  836. return CloseHandle(*mutex) == 0 ? -1 : 0;
  837. }
  838. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  839. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  840. }
  841. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  842. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  843. }
  844. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  845. (void) unused;
  846. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  847. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  848. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  849. }
  850. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  851. HANDLE handles[] = {cv->signal, cv->broadcast};
  852. ReleaseMutex(*mutex);
  853. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  854. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  855. }
  856. static int pthread_cond_signal(pthread_cond_t *cv) {
  857. return SetEvent(cv->signal) == 0 ? -1 : 0;
  858. }
  859. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  860. // Implementation with PulseEvent() has race condition, see
  861. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  862. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  863. }
  864. static int pthread_cond_destroy(pthread_cond_t *cv) {
  865. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  866. }
  867. // For Windows, change all slashes to backslashes in path names.
  868. static void change_slashes_to_backslashes(char *path) {
  869. int i;
  870. for (i = 0; path[i] != '\0'; i++) {
  871. if (path[i] == '/')
  872. path[i] = '\\';
  873. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  874. if (path[i] == '\\' && i > 0)
  875. while (path[i + 1] == '\\' || path[i + 1] == '/')
  876. (void) memmove(path + i + 1,
  877. path + i + 2, strlen(path + i + 1));
  878. }
  879. }
  880. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  881. // wbuf and wbuf_len is a target buffer and its length.
  882. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  883. char buf[PATH_MAX], buf2[PATH_MAX];
  884. mg_strlcpy(buf, path, sizeof(buf));
  885. change_slashes_to_backslashes(buf);
  886. // Convert to Unicode and back. If doubly-converted string does not
  887. // match the original, something is fishy, reject.
  888. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  889. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  890. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  891. NULL, NULL);
  892. if (strcmp(buf, buf2) != 0) {
  893. wbuf[0] = L'\0';
  894. }
  895. }
  896. #if defined(_WIN32_WCE)
  897. static time_t time(time_t *ptime) {
  898. time_t t;
  899. SYSTEMTIME st;
  900. FILETIME ft;
  901. GetSystemTime(&st);
  902. SystemTimeToFileTime(&st, &ft);
  903. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  904. if (ptime != NULL) {
  905. *ptime = t;
  906. }
  907. return t;
  908. }
  909. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  910. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  911. FILETIME ft, lft;
  912. SYSTEMTIME st;
  913. TIME_ZONE_INFORMATION tzinfo;
  914. if (ptm == NULL) {
  915. return NULL;
  916. }
  917. * (int64_t *) &ft = t;
  918. FileTimeToLocalFileTime(&ft, &lft);
  919. FileTimeToSystemTime(&lft, &st);
  920. ptm->tm_year = st.wYear - 1900;
  921. ptm->tm_mon = st.wMonth - 1;
  922. ptm->tm_wday = st.wDayOfWeek;
  923. ptm->tm_mday = st.wDay;
  924. ptm->tm_hour = st.wHour;
  925. ptm->tm_min = st.wMinute;
  926. ptm->tm_sec = st.wSecond;
  927. ptm->tm_yday = 0; // hope nobody uses this
  928. ptm->tm_isdst =
  929. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  930. return ptm;
  931. }
  932. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  933. // FIXME(lsm): fix this.
  934. return localtime(ptime, ptm);
  935. }
  936. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  937. const struct tm *tm) {
  938. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  939. return 0;
  940. }
  941. #endif
  942. // Windows happily opens files with some garbage at the end of file name.
  943. // For example, fopen("a.cgi ", "r") on Windows successfully opens
  944. // "a.cgi", despite one would expect an error back.
  945. // This function returns non-0 if path ends with some garbage.
  946. static int path_cannot_disclose_cgi(const char *path) {
  947. static const char *allowed_last_characters = "_-";
  948. int last = path[strlen(path) - 1];
  949. return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
  950. }
  951. static int mg_stat(struct mg_connection *conn, const char *path,
  952. struct file *filep) {
  953. wchar_t wbuf[PATH_MAX];
  954. WIN32_FILE_ATTRIBUTE_DATA info;
  955. if (!is_file_in_memory(conn, path, filep)) {
  956. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  957. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  958. filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  959. filep->modification_time = SYS2UNIX_TIME(
  960. info.ftLastWriteTime.dwLowDateTime,
  961. info.ftLastWriteTime.dwHighDateTime);
  962. filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  963. // If file name is fishy, reset the file structure and return error.
  964. // Note it is important to reset, not just return the error, cause
  965. // functions like is_file_opened() check the struct.
  966. if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
  967. memset(filep, 0, sizeof(*filep));
  968. }
  969. }
  970. }
  971. return filep->membuf != NULL || filep->modification_time != 0;
  972. }
  973. static int mg_remove(const char *path) {
  974. wchar_t wbuf[PATH_MAX];
  975. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  976. return DeleteFileW(wbuf) ? 0 : -1;
  977. }
  978. static int mg_mkdir(const char *path, int mode) {
  979. char buf[PATH_MAX];
  980. wchar_t wbuf[PATH_MAX];
  981. (void) mode;
  982. mg_strlcpy(buf, path, sizeof(buf));
  983. change_slashes_to_backslashes(buf);
  984. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
  985. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  986. }
  987. // Implementation of POSIX opendir/closedir/readdir for Windows.
  988. static DIR * opendir(const char *name) {
  989. DIR *dir = NULL;
  990. wchar_t wpath[PATH_MAX];
  991. DWORD attrs;
  992. if (name == NULL) {
  993. SetLastError(ERROR_BAD_ARGUMENTS);
  994. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  995. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  996. } else {
  997. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  998. attrs = GetFileAttributesW(wpath);
  999. if (attrs != 0xFFFFFFFF &&
  1000. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  1001. (void) wcscat(wpath, L"\\*");
  1002. dir->handle = FindFirstFileW(wpath, &dir->info);
  1003. dir->result.d_name[0] = '\0';
  1004. } else {
  1005. free(dir);
  1006. dir = NULL;
  1007. }
  1008. }
  1009. return dir;
  1010. }
  1011. static int closedir(DIR *dir) {
  1012. int result = 0;
  1013. if (dir != NULL) {
  1014. if (dir->handle != INVALID_HANDLE_VALUE)
  1015. result = FindClose(dir->handle) ? 0 : -1;
  1016. free(dir);
  1017. } else {
  1018. result = -1;
  1019. SetLastError(ERROR_BAD_ARGUMENTS);
  1020. }
  1021. return result;
  1022. }
  1023. static struct dirent *readdir(DIR *dir) {
  1024. struct dirent *result = 0;
  1025. if (dir) {
  1026. if (dir->handle != INVALID_HANDLE_VALUE) {
  1027. result = &dir->result;
  1028. (void) WideCharToMultiByte(CP_UTF8, 0,
  1029. dir->info.cFileName, -1, result->d_name,
  1030. sizeof(result->d_name), NULL, NULL);
  1031. if (!FindNextFileW(dir->handle, &dir->info)) {
  1032. (void) FindClose(dir->handle);
  1033. dir->handle = INVALID_HANDLE_VALUE;
  1034. }
  1035. } else {
  1036. SetLastError(ERROR_FILE_NOT_FOUND);
  1037. }
  1038. } else {
  1039. SetLastError(ERROR_BAD_ARGUMENTS);
  1040. }
  1041. return result;
  1042. }
  1043. #ifndef HAVE_POLL
  1044. static int poll(struct pollfd *pfd, int n, int milliseconds) {
  1045. struct timeval tv;
  1046. fd_set set;
  1047. int i, result;
  1048. int maxfd = 0;
  1049. tv.tv_sec = milliseconds / 1000;
  1050. tv.tv_usec = (milliseconds % 1000) * 1000;
  1051. FD_ZERO(&set);
  1052. for (i = 0; i < n; i++) {
  1053. FD_SET((SOCKET) pfd[i].fd, &set);
  1054. pfd[i].revents = 0;
  1055. if (pfd[i].fd > maxfd) {
  1056. maxfd = pfd[i].fd;
  1057. }
  1058. }
  1059. if ((result = select(maxfd+1, &set, NULL, NULL, &tv)) > 0) {
  1060. for (i = 0; i < n; i++) {
  1061. if (FD_ISSET(pfd[i].fd, &set)) {
  1062. pfd[i].revents = POLLIN;
  1063. }
  1064. }
  1065. }
  1066. return result;
  1067. }
  1068. #endif // HAVE_POLL
  1069. #define set_close_on_exec(x) // No FD_CLOEXEC on Windows
  1070. int mg_start_thread(mg_thread_func_t f, void *p) {
  1071. return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1072. }
  1073. static HANDLE dlopen(const char *dll_name, int flags) {
  1074. wchar_t wbuf[PATH_MAX];
  1075. (void) flags;
  1076. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1077. return LoadLibraryW(wbuf);
  1078. }
  1079. #if !defined(NO_CGI)
  1080. #define SIGKILL 0
  1081. static int kill(pid_t pid, int sig_num) {
  1082. (void) TerminateProcess(pid, sig_num);
  1083. (void) CloseHandle(pid);
  1084. return 0;
  1085. }
  1086. static void trim_trailing_whitespaces(char *s) {
  1087. char *e = s + strlen(s) - 1;
  1088. while (e > s && isspace(* (unsigned char *) e)) {
  1089. *e-- = '\0';
  1090. }
  1091. }
  1092. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1093. char *envblk, char *envp[], int fd_stdin,
  1094. int fd_stdout, const char *dir) {
  1095. HANDLE me;
  1096. char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
  1097. cmdline[PATH_MAX], buf[PATH_MAX];
  1098. struct file file = STRUCT_FILE_INITIALIZER;
  1099. STARTUPINFOA si;
  1100. PROCESS_INFORMATION pi = { 0 };
  1101. (void) envp;
  1102. memset(&si, 0, sizeof(si));
  1103. si.cb = sizeof(si);
  1104. // TODO(lsm): redirect CGI errors to the error log file
  1105. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1106. si.wShowWindow = SW_HIDE;
  1107. me = GetCurrentProcess();
  1108. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  1109. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1110. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  1111. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1112. // If CGI file is a script, try to read the interpreter line
  1113. interp = conn->ctx->config[CGI_INTERPRETER];
  1114. if (interp == NULL) {
  1115. buf[0] = buf[1] = '\0';
  1116. // Read the first line of the script into the buffer
  1117. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1118. if (mg_fopen(conn, cmdline, "r", &file)) {
  1119. p = (char *) file.membuf;
  1120. mg_fgets(buf, sizeof(buf), &file, &p);
  1121. mg_fclose(&file);
  1122. buf[sizeof(buf) - 1] = '\0';
  1123. }
  1124. if (buf[0] == '#' && buf[1] == '!') {
  1125. trim_trailing_whitespaces(buf + 2);
  1126. } else {
  1127. buf[2] = '\0';
  1128. }
  1129. interp = buf + 2;
  1130. }
  1131. if (interp[0] != '\0') {
  1132. GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
  1133. interp = full_interp;
  1134. }
  1135. GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
  1136. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s\\%s",
  1137. interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
  1138. DEBUG_TRACE(("Running [%s]", cmdline));
  1139. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1140. CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
  1141. cry(conn, "%s: CreateProcess(%s): %ld",
  1142. __func__, cmdline, ERRNO);
  1143. pi.hProcess = (pid_t) -1;
  1144. }
  1145. // Always close these to prevent handle leakage.
  1146. (void) close(fd_stdin);
  1147. (void) close(fd_stdout);
  1148. (void) CloseHandle(si.hStdOutput);
  1149. (void) CloseHandle(si.hStdInput);
  1150. (void) CloseHandle(pi.hThread);
  1151. return (pid_t) pi.hProcess;
  1152. }
  1153. #endif // !NO_CGI
  1154. static int set_non_blocking_mode(SOCKET sock) {
  1155. unsigned long on = 1;
  1156. return ioctlsocket(sock, FIONBIO, &on);
  1157. }
  1158. #else
  1159. static int mg_stat(struct mg_connection *conn, const char *path,
  1160. struct file *filep) {
  1161. struct stat st;
  1162. if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
  1163. filep->size = st.st_size;
  1164. filep->modification_time = st.st_mtime;
  1165. filep->is_directory = S_ISDIR(st.st_mode);
  1166. } else {
  1167. filep->modification_time = (time_t) 0;
  1168. }
  1169. return filep->membuf != NULL || filep->modification_time != (time_t) 0;
  1170. }
  1171. static void set_close_on_exec(int fd) {
  1172. fcntl(fd, F_SETFD, FD_CLOEXEC);
  1173. }
  1174. int mg_start_thread(mg_thread_func_t func, void *param) {
  1175. pthread_t thread_id;
  1176. pthread_attr_t attr;
  1177. (void) pthread_attr_init(&attr);
  1178. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1179. // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
  1180. // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
  1181. return pthread_create(&thread_id, &attr, func, param);
  1182. }
  1183. #ifndef NO_CGI
  1184. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1185. char *envblk, char *envp[], int fd_stdin,
  1186. int fd_stdout, const char *dir) {
  1187. pid_t pid;
  1188. const char *interp;
  1189. (void) envblk;
  1190. if ((pid = fork()) == -1) {
  1191. // Parent
  1192. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1193. } else if (pid == 0) {
  1194. // Child
  1195. if (chdir(dir) != 0) {
  1196. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1197. } else if (dup2(fd_stdin, 0) == -1) {
  1198. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1199. } else if (dup2(fd_stdout, 1) == -1) {
  1200. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1201. } else {
  1202. (void) dup2(fd_stdout, 2);
  1203. (void) close(fd_stdin);
  1204. (void) close(fd_stdout);
  1205. // After exec, all signal handlers are restored to their default values,
  1206. // with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
  1207. // implementation, SIGCHLD's handler will leave unchanged after exec
  1208. // if it was set to be ignored. Restore it to default action.
  1209. signal(SIGCHLD, SIG_DFL);
  1210. interp = conn->ctx->config[CGI_INTERPRETER];
  1211. if (interp == NULL) {
  1212. (void) execle(prog, prog, NULL, envp);
  1213. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1214. } else {
  1215. (void) execle(interp, interp, prog, NULL, envp);
  1216. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1217. strerror(ERRNO));
  1218. }
  1219. }
  1220. exit(EXIT_FAILURE);
  1221. }
  1222. // Parent. Close stdio descriptors
  1223. (void) close(fd_stdin);
  1224. (void) close(fd_stdout);
  1225. return pid;
  1226. }
  1227. #endif // !NO_CGI
  1228. static int set_non_blocking_mode(SOCKET sock) {
  1229. int flags;
  1230. flags = fcntl(sock, F_GETFL, 0);
  1231. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1232. return 0;
  1233. }
  1234. #endif // _WIN32
  1235. // Write data to the IO channel - opened file descriptor, socket or SSL
  1236. // descriptor. Return number of bytes written.
  1237. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1238. int64_t len) {
  1239. int64_t sent;
  1240. int n, k;
  1241. sent = 0;
  1242. while (sent < len) {
  1243. // How many bytes we send in this iteration
  1244. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1245. #ifndef NO_SSL
  1246. if (ssl != NULL) {
  1247. n = SSL_write(ssl, buf + sent, k);
  1248. } else
  1249. #endif
  1250. if (fp != NULL) {
  1251. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1252. if (ferror(fp))
  1253. n = -1;
  1254. } else {
  1255. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1256. }
  1257. if (n <= 0)
  1258. break;
  1259. sent += n;
  1260. }
  1261. return sent;
  1262. }
  1263. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1264. // Return negative value on error, or number of bytes read on success.
  1265. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1266. int nread;
  1267. if (fp != NULL) {
  1268. // Use read() instead of fread(), because if we're reading from the CGI
  1269. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1270. // to block and must pass all read bytes immediately to the client.
  1271. nread = read(fileno(fp), buf, (size_t) len);
  1272. #ifndef NO_SSL
  1273. } else if (conn->ssl != NULL) {
  1274. nread = SSL_read(conn->ssl, buf, len);
  1275. #endif
  1276. } else {
  1277. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1278. }
  1279. return conn->ctx->stop_flag ? -1 : nread;
  1280. }
  1281. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1282. int n, buffered_len, nread;
  1283. const char *body;
  1284. nread = 0;
  1285. if (conn->consumed_content < conn->content_len) {
  1286. // Adjust number of bytes to read.
  1287. int64_t to_read = conn->content_len - conn->consumed_content;
  1288. if (to_read < (int64_t) len) {
  1289. len = (size_t) to_read;
  1290. }
  1291. // Return buffered data
  1292. body = conn->buf + conn->request_len + conn->consumed_content;
  1293. buffered_len = &conn->buf[conn->data_len] - body;
  1294. if (buffered_len > 0) {
  1295. if (len < (size_t) buffered_len) {
  1296. buffered_len = (int) len;
  1297. }
  1298. memcpy(buf, body, (size_t) buffered_len);
  1299. len -= buffered_len;
  1300. conn->consumed_content += buffered_len;
  1301. nread += buffered_len;
  1302. buf = (char *) buf + buffered_len;
  1303. }
  1304. // We have returned all buffered data. Read new data from the remote socket.
  1305. while (len > 0) {
  1306. n = pull(NULL, conn, (char *) buf, (int) len);
  1307. if (n < 0) {
  1308. nread = n; // Propagate the error
  1309. break;
  1310. } else if (n == 0) {
  1311. break; // No more data to read
  1312. } else {
  1313. buf = (char *) buf + n;
  1314. conn->consumed_content += n;
  1315. nread += n;
  1316. len -= n;
  1317. }
  1318. }
  1319. }
  1320. return nread;
  1321. }
  1322. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1323. time_t now;
  1324. int64_t n, total, allowed;
  1325. if (conn->throttle > 0) {
  1326. if ((now = time(NULL)) != conn->last_throttle_time) {
  1327. conn->last_throttle_time = now;
  1328. conn->last_throttle_bytes = 0;
  1329. }
  1330. allowed = conn->throttle - conn->last_throttle_bytes;
  1331. if (allowed > (int64_t) len) {
  1332. allowed = len;
  1333. }
  1334. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1335. (int64_t) allowed)) == allowed) {
  1336. buf = (char *) buf + total;
  1337. conn->last_throttle_bytes += total;
  1338. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1339. allowed = conn->throttle > (int64_t) len - total ?
  1340. (int64_t) len - total : conn->throttle;
  1341. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1342. (int64_t) allowed)) != allowed) {
  1343. break;
  1344. }
  1345. sleep(1);
  1346. conn->last_throttle_bytes = allowed;
  1347. conn->last_throttle_time = time(NULL);
  1348. buf = (char *) buf + n;
  1349. total += n;
  1350. }
  1351. }
  1352. } else {
  1353. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1354. (int64_t) len);
  1355. }
  1356. return (int) total;
  1357. }
  1358. // Print message to buffer. If buffer is large enough to hold the message,
  1359. // return buffer. If buffer is to small, allocate large enough buffer on heap,
  1360. // and return allocated buffer.
  1361. static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
  1362. va_list ap_copy;
  1363. int len;
  1364. // Windows is not standard-compliant, and vsnprintf() returns -1 if
  1365. // buffer is too small. Also, older versions of msvcrt.dll do not have
  1366. // _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
  1367. // Therefore, we make two passes: on first pass, get required message length.
  1368. // On second pass, actually print the message.
  1369. va_copy(ap_copy, ap);
  1370. len = vsnprintf(NULL, 0, fmt, ap_copy);
  1371. if (len > (int) size &&
  1372. (size = len + 1) > 0 &&
  1373. (*buf = (char *) malloc(size)) == NULL) {
  1374. len = -1; // Allocation failed, mark failure
  1375. } else {
  1376. va_copy(ap_copy, ap);
  1377. vsnprintf(*buf, size, fmt, ap_copy);
  1378. }
  1379. return len;
  1380. }
  1381. int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
  1382. char mem[MG_BUF_LEN], *buf = mem;
  1383. int len;
  1384. if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
  1385. len = mg_write(conn, buf, (size_t) len);
  1386. }
  1387. if (buf != mem && buf != NULL) {
  1388. free(buf);
  1389. }
  1390. return len;
  1391. }
  1392. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1393. va_list ap;
  1394. va_start(ap, fmt);
  1395. return mg_vprintf(conn, fmt, ap);
  1396. }
  1397. // URL-decode input buffer into destination buffer.
  1398. // 0-terminate the destination buffer. Return the length of decoded data.
  1399. // form-url-encoded data differs from URI encoding in a way that it
  1400. // uses '+' as character for space, see RFC 1866 section 8.2.1
  1401. // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
  1402. static int url_decode(const char *src, int src_len, char *dst,
  1403. int dst_len, int is_form_url_encoded) {
  1404. int i, j, a, b;
  1405. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1406. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1407. if (src[i] == '%' && i < src_len - 2 &&
  1408. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1409. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1410. a = tolower(* (const unsigned char *) (src + i + 1));
  1411. b = tolower(* (const unsigned char *) (src + i + 2));
  1412. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1413. i += 2;
  1414. } else if (is_form_url_encoded && src[i] == '+') {
  1415. dst[j] = ' ';
  1416. } else {
  1417. dst[j] = src[i];
  1418. }
  1419. }
  1420. dst[j] = '\0'; // Null-terminate the destination
  1421. return i >= src_len ? j : -1;
  1422. }
  1423. int mg_get_var(const char *data, size_t data_len, const char *name,
  1424. char *dst, size_t dst_len) {
  1425. const char *p, *e, *s;
  1426. size_t name_len;
  1427. int len;
  1428. if (dst == NULL || dst_len == 0) {
  1429. len = -2;
  1430. } else if (data == NULL || name == NULL || data_len == 0) {
  1431. len = -1;
  1432. dst[0] = '\0';
  1433. } else {
  1434. name_len = strlen(name);
  1435. e = data + data_len;
  1436. len = -1;
  1437. dst[0] = '\0';
  1438. // data is "var1=val1&var2=val2...". Find variable first
  1439. for (p = data; p + name_len < e; p++) {
  1440. if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
  1441. !mg_strncasecmp(name, p, name_len)) {
  1442. // Point p to variable value
  1443. p += name_len + 1;
  1444. // Point s to the end of the value
  1445. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1446. if (s == NULL) {
  1447. s = e;
  1448. }
  1449. assert(s >= p);
  1450. // Decode variable into destination buffer
  1451. len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1452. // Redirect error code from -1 to -2 (destination buffer too small).
  1453. if (len == -1) {
  1454. len = -2;
  1455. }
  1456. break;
  1457. }
  1458. }
  1459. }
  1460. return len;
  1461. }
  1462. int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
  1463. char *dst, size_t dst_size) {
  1464. const char *s, *p, *end;
  1465. int name_len, len = -1;
  1466. if (dst == NULL || dst_size == 0) {
  1467. len = -2;
  1468. } else if (cookie_name == NULL ||
  1469. (s = mg_get_header(conn, "Cookie")) == NULL) {
  1470. len = -1;
  1471. dst[0] = '\0';
  1472. } else {
  1473. name_len = (int) strlen(cookie_name);
  1474. end = s + strlen(s);
  1475. dst[0] = '\0';
  1476. for (; (s = mg_strcasestr(s, cookie_name)) != NULL; s += name_len) {
  1477. if (s[name_len] == '=') {
  1478. s += name_len + 1;
  1479. if ((p = strchr(s, ' ')) == NULL)
  1480. p = end;
  1481. if (p[-1] == ';')
  1482. p--;
  1483. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1484. s++;
  1485. p--;
  1486. }
  1487. if ((size_t) (p - s) < dst_size) {
  1488. len = p - s;
  1489. mg_strlcpy(dst, s, (size_t) len + 1);
  1490. } else {
  1491. len = -2;
  1492. }
  1493. break;
  1494. }
  1495. }
  1496. }
  1497. return len;
  1498. }
  1499. static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1500. size_t buf_len, struct file *filep) {
  1501. struct vec a, b;
  1502. const char *rewrite, *uri = conn->request_info.uri;
  1503. char *p;
  1504. int match_len;
  1505. // Using buf_len - 1 because memmove() for PATH_INFO may shift part
  1506. // of the path one byte on the right.
  1507. mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
  1508. uri);
  1509. rewrite = conn->ctx->config[REWRITE];
  1510. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1511. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1512. mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
  1513. uri + match_len);
  1514. break;
  1515. }
  1516. }
  1517. if (!mg_stat(conn, buf, filep)) {
  1518. // Support PATH_INFO for CGI scripts.
  1519. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1520. if (*p == '/') {
  1521. *p = '\0';
  1522. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1523. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1524. mg_stat(conn, buf, filep)) {
  1525. // Shift PATH_INFO block one character right, e.g.
  1526. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1527. // conn->path_info is pointing to the local variable "path" declared
  1528. // in handle_request(), so PATH_INFO is not valid after
  1529. // handle_request returns.
  1530. conn->path_info = p + 1;
  1531. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1532. p[1] = '/';
  1533. break;
  1534. } else {
  1535. *p = '/';
  1536. }
  1537. }
  1538. }
  1539. }
  1540. }
  1541. // Check whether full request is buffered. Return:
  1542. // -1 if request is malformed
  1543. // 0 if request is not yet fully buffered
  1544. // >0 actual request length, including last \r\n\r\n
  1545. static int get_request_len(const char *buf, int buflen) {
  1546. const char *s, *e;
  1547. int len = 0;
  1548. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1549. // Control characters are not allowed but >=128 is.
  1550. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1551. *s != '\n' && * (const unsigned char *) s < 128) {
  1552. len = -1;
  1553. break; // [i_a] abort scan as soon as one malformed character is found;
  1554. // don't let subsequent \r\n\r\n win us over anyhow
  1555. } else if (s[0] == '\n' && s[1] == '\n') {
  1556. len = (int) (s - buf) + 2;
  1557. } else if (s[0] == '\n' && &s[1] < e &&
  1558. s[1] == '\r' && s[2] == '\n') {
  1559. len = (int) (s - buf) + 3;
  1560. }
  1561. return len;
  1562. }
  1563. // Convert month to the month number. Return -1 on error, or month number
  1564. static int get_month_index(const char *s) {
  1565. size_t i;
  1566. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1567. if (!strcmp(s, month_names[i]))
  1568. return (int) i;
  1569. return -1;
  1570. }
  1571. static int num_leap_years(int year) {
  1572. return year / 4 - year / 100 + year / 400;
  1573. }
  1574. // Parse UTC date-time string, and return the corresponding time_t value.
  1575. static time_t parse_date_string(const char *datetime) {
  1576. static const unsigned short days_before_month[] = {
  1577. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1578. };
  1579. char month_str[32];
  1580. int second, minute, hour, day, month, year, leap_days, days;
  1581. time_t result = (time_t) 0;
  1582. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1583. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1584. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1585. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1586. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1587. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1588. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1589. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1590. year > 1970 &&
  1591. (month = get_month_index(month_str)) != -1) {
  1592. leap_days = num_leap_years(year) - num_leap_years(1970);
  1593. year -= 1970;
  1594. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1595. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1596. }
  1597. return result;
  1598. }
  1599. // Protect against directory disclosure attack by removing '..',
  1600. // excessive '/' and '\' characters
  1601. static void remove_double_dots_and_double_slashes(char *s) {
  1602. char *p = s;
  1603. while (*s != '\0') {
  1604. *p++ = *s++;
  1605. if (s[-1] == '/' || s[-1] == '\\') {
  1606. // Skip all following slashes, backslashes and double-dots
  1607. while (s[0] != '\0') {
  1608. if (s[0] == '/' || s[0] == '\\') {
  1609. s++;
  1610. } else if (s[0] == '.' && s[1] == '.') {
  1611. s += 2;
  1612. } else {
  1613. break;
  1614. }
  1615. }
  1616. }
  1617. }
  1618. *p = '\0';
  1619. }
  1620. static const struct {
  1621. const char *extension;
  1622. size_t ext_len;
  1623. const char *mime_type;
  1624. } builtin_mime_types[] = {
  1625. {".html", 5, "text/html"},
  1626. {".htm", 4, "text/html"},
  1627. {".shtm", 5, "text/html"},
  1628. {".shtml", 6, "text/html"},
  1629. {".css", 4, "text/css"},
  1630. {".js", 3, "application/x-javascript"},
  1631. {".ico", 4, "image/x-icon"},
  1632. {".gif", 4, "image/gif"},
  1633. {".jpg", 4, "image/jpeg"},
  1634. {".jpeg", 5, "image/jpeg"},
  1635. {".png", 4, "image/png"},
  1636. {".svg", 4, "image/svg+xml"},
  1637. {".txt", 4, "text/plain"},
  1638. {".torrent", 8, "application/x-bittorrent"},
  1639. {".wav", 4, "audio/x-wav"},
  1640. {".mp3", 4, "audio/x-mp3"},
  1641. {".mid", 4, "audio/mid"},
  1642. {".m3u", 4, "audio/x-mpegurl"},
  1643. {".ogg", 4, "audio/ogg"},
  1644. {".ram", 4, "audio/x-pn-realaudio"},
  1645. {".xml", 4, "text/xml"},
  1646. {".json", 5, "text/json"},
  1647. {".xslt", 5, "application/xml"},
  1648. {".xsl", 4, "application/xml"},
  1649. {".ra", 3, "audio/x-pn-realaudio"},
  1650. {".doc", 4, "application/msword"},
  1651. {".exe", 4, "application/octet-stream"},
  1652. {".zip", 4, "application/x-zip-compressed"},
  1653. {".xls", 4, "application/excel"},
  1654. {".tgz", 4, "application/x-tar-gz"},
  1655. {".tar", 4, "application/x-tar"},
  1656. {".gz", 3, "application/x-gunzip"},
  1657. {".arj", 4, "application/x-arj-compressed"},
  1658. {".rar", 4, "application/x-arj-compressed"},
  1659. {".rtf", 4, "application/rtf"},
  1660. {".pdf", 4, "application/pdf"},
  1661. {".swf", 4, "application/x-shockwave-flash"},
  1662. {".mpg", 4, "video/mpeg"},
  1663. {".webm", 5, "video/webm"},
  1664. {".mpeg", 5, "video/mpeg"},
  1665. {".mp4", 4, "video/mp4"},
  1666. {".m4v", 4, "video/x-m4v"},
  1667. {".asf", 4, "video/x-ms-asf"},
  1668. {".avi", 4, "video/x-msvideo"},
  1669. {".bmp", 4, "image/bmp"},
  1670. {NULL, 0, NULL}
  1671. };
  1672. const char *mg_get_builtin_mime_type(const char *path) {
  1673. const char *ext;
  1674. size_t i, path_len;
  1675. path_len = strlen(path);
  1676. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1677. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1678. if (path_len > builtin_mime_types[i].ext_len &&
  1679. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1680. return builtin_mime_types[i].mime_type;
  1681. }
  1682. }
  1683. return "text/plain";
  1684. }
  1685. // Look at the "path" extension and figure what mime type it has.
  1686. // Store mime type in the vector.
  1687. static void get_mime_type(struct mg_context *ctx, const char *path,
  1688. struct vec *vec) {
  1689. struct vec ext_vec, mime_vec;
  1690. const char *list, *ext;
  1691. size_t path_len;
  1692. path_len = strlen(path);
  1693. // Scan user-defined mime types first, in case user wants to
  1694. // override default mime types.
  1695. list = ctx->config[EXTRA_MIME_TYPES];
  1696. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1697. // ext now points to the path suffix
  1698. ext = path + path_len - ext_vec.len;
  1699. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1700. *vec = mime_vec;
  1701. return;
  1702. }
  1703. }
  1704. vec->ptr = mg_get_builtin_mime_type(path);
  1705. vec->len = strlen(vec->ptr);
  1706. }
  1707. static int is_big_endian(void) {
  1708. static const int n = 1;
  1709. return ((char *) &n)[0] == 0;
  1710. }
  1711. #ifndef HAVE_MD5
  1712. typedef struct MD5Context {
  1713. uint32_t buf[4];
  1714. uint32_t bits[2];
  1715. unsigned char in[64];
  1716. } MD5_CTX;
  1717. static void byteReverse(unsigned char *buf, unsigned longs) {
  1718. uint32_t t;
  1719. // Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
  1720. if (is_big_endian()) {
  1721. do {
  1722. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1723. ((unsigned) buf[1] << 8 | buf[0]);
  1724. * (uint32_t *) buf = t;
  1725. buf += 4;
  1726. } while (--longs);
  1727. }
  1728. }
  1729. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1730. #define F2(x, y, z) F1(z, x, y)
  1731. #define F3(x, y, z) (x ^ y ^ z)
  1732. #define F4(x, y, z) (y ^ (x | ~z))
  1733. #define MD5STEP(f, w, x, y, z, data, s) \
  1734. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1735. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1736. // initialization constants.
  1737. static void MD5Init(MD5_CTX *ctx) {
  1738. ctx->buf[0] = 0x67452301;
  1739. ctx->buf[1] = 0xefcdab89;
  1740. ctx->buf[2] = 0x98badcfe;
  1741. ctx->buf[3] = 0x10325476;
  1742. ctx->bits[0] = 0;
  1743. ctx->bits[1] = 0;
  1744. }
  1745. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1746. register uint32_t a, b, c, d;
  1747. a = buf[0];
  1748. b = buf[1];
  1749. c = buf[2];
  1750. d = buf[3];
  1751. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1752. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1753. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1754. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1755. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1756. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1757. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1758. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1759. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1760. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1761. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1762. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1763. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1764. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1765. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1766. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1767. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1768. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1769. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1770. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1771. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1772. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1773. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1774. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1775. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1776. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1777. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1778. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1779. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1780. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1781. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1782. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1783. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1784. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1785. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1786. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1787. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1788. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1789. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1790. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1791. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1792. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1793. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1794. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1795. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1796. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1797. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1798. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1799. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1800. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1801. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1802. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1803. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1804. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1805. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1806. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1807. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1808. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1809. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1810. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1811. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1812. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1813. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1814. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1815. buf[0] += a;
  1816. buf[1] += b;
  1817. buf[2] += c;
  1818. buf[3] += d;
  1819. }
  1820. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1821. uint32_t t;
  1822. t = ctx->bits[0];
  1823. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1824. ctx->bits[1]++;
  1825. ctx->bits[1] += len >> 29;
  1826. t = (t >> 3) & 0x3f;
  1827. if (t) {
  1828. unsigned char *p = (unsigned char *) ctx->in + t;
  1829. t = 64 - t;
  1830. if (len < t) {
  1831. memcpy(p, buf, len);
  1832. return;
  1833. }
  1834. memcpy(p, buf, t);
  1835. byteReverse(ctx->in, 16);
  1836. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1837. buf += t;
  1838. len -= t;
  1839. }
  1840. while (len >= 64) {
  1841. memcpy(ctx->in, buf, 64);
  1842. byteReverse(ctx->in, 16);
  1843. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1844. buf += 64;
  1845. len -= 64;
  1846. }
  1847. memcpy(ctx->in, buf, len);
  1848. }
  1849. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1850. unsigned count;
  1851. unsigned char *p;
  1852. uint32_t *a;
  1853. count = (ctx->bits[0] >> 3) & 0x3F;
  1854. p = ctx->in + count;
  1855. *p++ = 0x80;
  1856. count = 64 - 1 - count;
  1857. if (count < 8) {
  1858. memset(p, 0, count);
  1859. byteReverse(ctx->in, 16);
  1860. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1861. memset(ctx->in, 0, 56);
  1862. } else {
  1863. memset(p, 0, count - 8);
  1864. }
  1865. byteReverse(ctx->in, 14);
  1866. a = (uint32_t *)ctx->in;
  1867. a[14] = ctx->bits[0];
  1868. a[15] = ctx->bits[1];
  1869. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1870. byteReverse((unsigned char *) ctx->buf, 4);
  1871. memcpy(digest, ctx->buf, 16);
  1872. memset((char *) ctx, 0, sizeof(*ctx));
  1873. }
  1874. #endif // !HAVE_MD5
  1875. // Stringify binary data. Output buffer must be twice as big as input,
  1876. // because each byte takes 2 bytes in string representation
  1877. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1878. static const char *hex = "0123456789abcdef";
  1879. for (; len--; p++) {
  1880. *to++ = hex[p[0] >> 4];
  1881. *to++ = hex[p[0] & 0x0f];
  1882. }
  1883. *to = '\0';
  1884. }
  1885. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1886. char *mg_md5(char buf[33], ...) {
  1887. unsigned char hash[16];
  1888. const char *p;
  1889. va_list ap;
  1890. MD5_CTX ctx;
  1891. MD5Init(&ctx);
  1892. va_start(ap, buf);
  1893. while ((p = va_arg(ap, const char *)) != NULL) {
  1894. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1895. }
  1896. va_end(ap);
  1897. MD5Final(hash, &ctx);
  1898. bin2str(buf, hash, sizeof(hash));
  1899. return buf;
  1900. }
  1901. // Check the user's password, return 1 if OK
  1902. static int check_password(const char *method, const char *ha1, const char *uri,
  1903. const char *nonce, const char *nc, const char *cnonce,
  1904. const char *qop, const char *response) {
  1905. char ha2[32 + 1], expected_response[32 + 1];
  1906. // Some of the parameters may be NULL
  1907. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1908. qop == NULL || response == NULL) {
  1909. return 0;
  1910. }
  1911. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1912. // TODO(lsm): check for authentication timeout
  1913. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1914. strlen(response) != 32
  1915. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1916. ) {
  1917. return 0;
  1918. }
  1919. mg_md5(ha2, method, ":", uri, NULL);
  1920. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1921. ":", cnonce, ":", qop, ":", ha2, NULL);
  1922. return mg_strcasecmp(response, expected_response) == 0;
  1923. }
  1924. // Use the global passwords file, if specified by auth_gpass option,
  1925. // or search for .htpasswd in the requested directory.
  1926. static void open_auth_file(struct mg_connection *conn, const char *path,
  1927. struct file *filep) {
  1928. char name[PATH_MAX];
  1929. const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
  1930. if (gpass != NULL) {
  1931. // Use global passwords file
  1932. if (!mg_fopen(conn, gpass, "r", filep)) {
  1933. cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
  1934. }
  1935. } else if (mg_stat(conn, path, filep) && filep->is_directory) {
  1936. mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1937. path, '/', PASSWORDS_FILE_NAME);
  1938. mg_fopen(conn, name, "r", filep);
  1939. } else {
  1940. // Try to find .htpasswd in requested directory.
  1941. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1942. if (e[0] == '/')
  1943. break;
  1944. mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1945. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  1946. mg_fopen(conn, name, "r", filep);
  1947. }
  1948. }
  1949. // Parsed Authorization header
  1950. struct ah {
  1951. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1952. };
  1953. // Return 1 on success. Always initializes the ah structure.
  1954. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1955. size_t buf_size, struct ah *ah) {
  1956. char *name, *value, *s;
  1957. const char *auth_header;
  1958. (void) memset(ah, 0, sizeof(*ah));
  1959. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  1960. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  1961. return 0;
  1962. }
  1963. // Make modifiable copy of the auth header
  1964. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  1965. s = buf;
  1966. // Parse authorization header
  1967. for (;;) {
  1968. // Gobble initial spaces
  1969. while (isspace(* (unsigned char *) s)) {
  1970. s++;
  1971. }
  1972. name = skip_quoted(&s, "=", " ", 0);
  1973. // Value is either quote-delimited, or ends at first comma or space.
  1974. if (s[0] == '\"') {
  1975. s++;
  1976. value = skip_quoted(&s, "\"", " ", '\\');
  1977. if (s[0] == ',') {
  1978. s++;
  1979. }
  1980. } else {
  1981. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  1982. }
  1983. if (*name == '\0') {
  1984. break;
  1985. }
  1986. if (!strcmp(name, "username")) {
  1987. ah->user = value;
  1988. } else if (!strcmp(name, "cnonce")) {
  1989. ah->cnonce = value;
  1990. } else if (!strcmp(name, "response")) {
  1991. ah->response = value;
  1992. } else if (!strcmp(name, "uri")) {
  1993. ah->uri = value;
  1994. } else if (!strcmp(name, "qop")) {
  1995. ah->qop = value;
  1996. } else if (!strcmp(name, "nc")) {
  1997. ah->nc = value;
  1998. } else if (!strcmp(name, "nonce")) {
  1999. ah->nonce = value;
  2000. }
  2001. }
  2002. // CGI needs it as REMOTE_USER
  2003. if (ah->user != NULL) {
  2004. conn->request_info.remote_user = mg_strdup(ah->user);
  2005. } else {
  2006. return 0;
  2007. }
  2008. return 1;
  2009. }
  2010. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
  2011. char *eof;
  2012. size_t len;
  2013. if (filep->membuf != NULL && *p != NULL) {
  2014. eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
  2015. len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
  2016. memcpy(buf, *p, len);
  2017. buf[len] = '\0';
  2018. *p = eof;
  2019. return eof;
  2020. } else if (filep->fp != NULL) {
  2021. return fgets(buf, size, filep->fp);
  2022. } else {
  2023. return NULL;
  2024. }
  2025. }
  2026. // Authorize against the opened passwords file. Return 1 if authorized.
  2027. static int authorize(struct mg_connection *conn, struct file *filep) {
  2028. struct ah ah;
  2029. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
  2030. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  2031. return 0;
  2032. }
  2033. // Loop over passwords file
  2034. p = (char *) filep->membuf;
  2035. while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
  2036. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  2037. continue;
  2038. }
  2039. if (!strcmp(ah.user, f_user) &&
  2040. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  2041. return check_password(conn->request_info.request_method, ha1, ah.uri,
  2042. ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
  2043. }
  2044. return 0;
  2045. }
  2046. // Return 1 if request is authorised, 0 otherwise.
  2047. static int check_authorization(struct mg_connection *conn, const char *path) {
  2048. char fname[PATH_MAX];
  2049. struct vec uri_vec, filename_vec;
  2050. const char *list;
  2051. struct file file = STRUCT_FILE_INITIALIZER;
  2052. int authorized = 1;
  2053. list = conn->ctx->config[PROTECT_URI];
  2054. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  2055. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  2056. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2057. (int) filename_vec.len, filename_vec.ptr);
  2058. if (!mg_fopen(conn, fname, "r", &file)) {
  2059. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2060. }
  2061. break;
  2062. }
  2063. }
  2064. if (!is_file_opened(&file)) {
  2065. open_auth_file(conn, path, &file);
  2066. }
  2067. if (is_file_opened(&file)) {
  2068. authorized = authorize(conn, &file);
  2069. mg_fclose(&file);
  2070. }
  2071. return authorized;
  2072. }
  2073. static void send_authorization_request(struct mg_connection *conn) {
  2074. conn->status_code = 401;
  2075. mg_printf(conn,
  2076. "HTTP/1.1 401 Unauthorized\r\n"
  2077. "Content-Length: 0\r\n"
  2078. "WWW-Authenticate: Digest qop=\"auth\", "
  2079. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2080. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2081. (unsigned long) time(NULL));
  2082. }
  2083. static int is_authorized_for_put(struct mg_connection *conn) {
  2084. struct file file = STRUCT_FILE_INITIALIZER;
  2085. const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
  2086. int ret = 0;
  2087. if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
  2088. ret = authorize(conn, &file);
  2089. mg_fclose(&file);
  2090. }
  2091. return ret;
  2092. }
  2093. int mg_modify_passwords_file(const char *fname, const char *domain,
  2094. const char *user, const char *pass) {
  2095. int found;
  2096. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2097. FILE *fp, *fp2;
  2098. found = 0;
  2099. fp = fp2 = NULL;
  2100. // Regard empty password as no password - remove user record.
  2101. if (pass != NULL && pass[0] == '\0') {
  2102. pass = NULL;
  2103. }
  2104. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2105. // Create the file if does not exist
  2106. if ((fp = fopen(fname, "a+")) != NULL) {
  2107. (void) fclose(fp);
  2108. }
  2109. // Open the given file and temporary file
  2110. if ((fp = fopen(fname, "r")) == NULL) {
  2111. return 0;
  2112. } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
  2113. fclose(fp);
  2114. return 0;
  2115. }
  2116. // Copy the stuff to temporary file
  2117. while (fgets(line, sizeof(line), fp) != NULL) {
  2118. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2119. continue;
  2120. }
  2121. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2122. found++;
  2123. if (pass != NULL) {
  2124. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2125. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2126. }
  2127. } else {
  2128. fprintf(fp2, "%s", line);
  2129. }
  2130. }
  2131. // If new user, just add it
  2132. if (!found && pass != NULL) {
  2133. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2134. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2135. }
  2136. // Close files
  2137. fclose(fp);
  2138. fclose(fp2);
  2139. // Put the temp file in place of real file
  2140. remove(fname);
  2141. rename(tmp, fname);
  2142. return 1;
  2143. }
  2144. struct de {
  2145. struct mg_connection *conn;
  2146. char *file_name;
  2147. struct file file;
  2148. };
  2149. static void url_encode(const char *src, char *dst, size_t dst_len) {
  2150. static const char *dont_escape = "._-$,;~()";
  2151. static const char *hex = "0123456789abcdef";
  2152. const char *end = dst + dst_len - 1;
  2153. for (; *src != '\0' && dst < end; src++, dst++) {
  2154. if (isalnum(*(const unsigned char *) src) ||
  2155. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2156. *dst = *src;
  2157. } else if (dst + 2 < end) {
  2158. dst[0] = '%';
  2159. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2160. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2161. dst += 2;
  2162. }
  2163. }
  2164. *dst = '\0';
  2165. }
  2166. static void print_dir_entry(struct de *de) {
  2167. char size[64], mod[64], href[PATH_MAX];
  2168. if (de->file.is_directory) {
  2169. mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2170. } else {
  2171. // We use (signed) cast below because MSVC 6 compiler cannot
  2172. // convert unsigned __int64 to double. Sigh.
  2173. if (de->file.size < 1024) {
  2174. mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
  2175. } else if (de->file.size < 0x100000) {
  2176. mg_snprintf(de->conn, size, sizeof(size),
  2177. "%.1fk", (double) de->file.size / 1024.0);
  2178. } else if (de->file.size < 0x40000000) {
  2179. mg_snprintf(de->conn, size, sizeof(size),
  2180. "%.1fM", (double) de->file.size / 1048576);
  2181. } else {
  2182. mg_snprintf(de->conn, size, sizeof(size),
  2183. "%.1fG", (double) de->file.size / 1073741824);
  2184. }
  2185. }
  2186. strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
  2187. localtime(&de->file.modification_time));
  2188. url_encode(de->file_name, href, sizeof(href));
  2189. de->conn->num_bytes_sent += mg_printf(de->conn,
  2190. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2191. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2192. de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
  2193. de->file_name, de->file.is_directory ? "/" : "", mod, size);
  2194. }
  2195. // This function is called from send_directory() and used for
  2196. // sorting directory entries by size, or name, or modification time.
  2197. // On windows, __cdecl specification is needed in case if project is built
  2198. // with __stdcall convention. qsort always requires __cdels callback.
  2199. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2200. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2201. const char *query_string = a->conn->request_info.query_string;
  2202. int cmp_result = 0;
  2203. if (query_string == NULL) {
  2204. query_string = "na";
  2205. }
  2206. if (a->file.is_directory && !b->file.is_directory) {
  2207. return -1; // Always put directories on top
  2208. } else if (!a->file.is_directory && b->file.is_directory) {
  2209. return 1; // Always put directories on top
  2210. } else if (*query_string == 'n') {
  2211. cmp_result = strcmp(a->file_name, b->file_name);
  2212. } else if (*query_string == 's') {
  2213. cmp_result = a->file.size == b->file.size ? 0 :
  2214. a->file.size > b->file.size ? 1 : -1;
  2215. } else if (*query_string == 'd') {
  2216. cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
  2217. a->file.modification_time > b->file.modification_time ? 1 : -1;
  2218. }
  2219. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2220. }
  2221. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2222. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2223. const char *pattern = conn->ctx->config[HIDE_FILES];
  2224. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2225. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2226. }
  2227. static int scan_directory(struct mg_connection *conn, const char *dir,
  2228. void *data, void (*cb)(struct de *, void *)) {
  2229. char path[PATH_MAX];
  2230. struct dirent *dp;
  2231. DIR *dirp;
  2232. struct de de;
  2233. if ((dirp = opendir(dir)) == NULL) {
  2234. return 0;
  2235. } else {
  2236. de.conn = conn;
  2237. while ((dp = readdir(dirp)) != NULL) {
  2238. // Do not show current dir and hidden files
  2239. if (!strcmp(dp->d_name, ".") ||
  2240. !strcmp(dp->d_name, "..") ||
  2241. must_hide_file(conn, dp->d_name)) {
  2242. continue;
  2243. }
  2244. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2245. // If we don't memset stat structure to zero, mtime will have
  2246. // garbage and strftime() will segfault later on in
  2247. // print_dir_entry(). memset is required only if mg_stat()
  2248. // fails. For more details, see
  2249. // http://code.google.com/p/mongoose/issues/detail?id=79
  2250. memset(&de.file, 0, sizeof(de.file));
  2251. mg_stat(conn, path, &de.file);
  2252. de.file_name = dp->d_name;
  2253. cb(&de, data);
  2254. }
  2255. (void) closedir(dirp);
  2256. }
  2257. return 1;
  2258. }
  2259. struct dir_scan_data {
  2260. struct de *entries;
  2261. int num_entries;
  2262. int arr_size;
  2263. };
  2264. static void dir_scan_callback(struct de *de, void *data) {
  2265. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2266. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2267. dsd->arr_size *= 2;
  2268. dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
  2269. sizeof(dsd->entries[0]));
  2270. }
  2271. if (dsd->entries == NULL) {
  2272. // TODO(lsm): propagate an error to the caller
  2273. dsd->num_entries = 0;
  2274. } else {
  2275. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2276. dsd->entries[dsd->num_entries].file = de->file;
  2277. dsd->entries[dsd->num_entries].conn = de->conn;
  2278. dsd->num_entries++;
  2279. }
  2280. }
  2281. static void handle_directory_request(struct mg_connection *conn,
  2282. const char *dir) {
  2283. int i, sort_direction;
  2284. struct dir_scan_data data = { NULL, 0, 128 };
  2285. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2286. send_http_error(conn, 500, "Cannot open directory",
  2287. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2288. return;
  2289. }
  2290. sort_direction = conn->request_info.query_string != NULL &&
  2291. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2292. conn->must_close = 1;
  2293. mg_printf(conn, "%s",
  2294. "HTTP/1.1 200 OK\r\n"
  2295. "Connection: close\r\n"
  2296. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2297. conn->num_bytes_sent += mg_printf(conn,
  2298. "<html><head><title>Index of %s</title>"
  2299. "<style>th {text-align: left;}</style></head>"
  2300. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2301. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2302. "<th><a href=\"?d%c\">Modified</a></th>"
  2303. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2304. "<tr><td colspan=\"3\"><hr></td></tr>",
  2305. conn->request_info.uri, conn->request_info.uri,
  2306. sort_direction, sort_direction, sort_direction);
  2307. // Print first entry - link to a parent directory
  2308. conn->num_bytes_sent += mg_printf(conn,
  2309. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2310. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2311. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2312. // Sort and print directory entries
  2313. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2314. compare_dir_entries);
  2315. for (i = 0; i < data.num_entries; i++) {
  2316. print_dir_entry(&data.entries[i]);
  2317. free(data.entries[i].file_name);
  2318. }
  2319. free(data.entries);
  2320. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2321. conn->status_code = 200;
  2322. }
  2323. // Send len bytes from the opened file to the client.
  2324. static void send_file_data(struct mg_connection *conn, struct file *filep,
  2325. int64_t offset, int64_t len) {
  2326. char buf[MG_BUF_LEN];
  2327. int to_read, num_read, num_written;
  2328. if (len > 0 && filep->membuf != NULL && filep->size > 0) {
  2329. if (len > filep->size - offset) {
  2330. len = filep->size - offset;
  2331. }
  2332. mg_write(conn, filep->membuf + offset, (size_t) len);
  2333. } else if (len > 0 && filep->fp != NULL) {
  2334. fseeko(filep->fp, offset, SEEK_SET);
  2335. while (len > 0) {
  2336. // Calculate how much to read from the file in the buffer
  2337. to_read = sizeof(buf);
  2338. if ((int64_t) to_read > len) {
  2339. to_read = (int) len;
  2340. }
  2341. // Read from file, exit the loop on error
  2342. if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
  2343. break;
  2344. }
  2345. // Send read bytes to the client, exit the loop on error
  2346. if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
  2347. break;
  2348. }
  2349. // Both read and were successful, adjust counters
  2350. conn->num_bytes_sent += num_written;
  2351. len -= num_written;
  2352. }
  2353. }
  2354. }
  2355. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2356. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2357. }
  2358. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2359. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2360. }
  2361. static void construct_etag(char *buf, size_t buf_len,
  2362. const struct file *filep) {
  2363. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2364. (unsigned long) filep->modification_time, filep->size);
  2365. }
  2366. static void fclose_on_exec(struct file *filep) {
  2367. if (filep != NULL && filep->fp != NULL) {
  2368. #ifndef _WIN32
  2369. fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
  2370. #endif
  2371. }
  2372. }
  2373. static void handle_file_request(struct mg_connection *conn, const char *path,
  2374. struct file *filep) {
  2375. char date[64], lm[64], etag[64], range[64];
  2376. const char *msg = "OK", *hdr;
  2377. time_t curtime = time(NULL);
  2378. int64_t cl, r1, r2;
  2379. struct vec mime_vec;
  2380. int n;
  2381. get_mime_type(conn->ctx, path, &mime_vec);
  2382. cl = filep->size;
  2383. conn->status_code = 200;
  2384. range[0] = '\0';
  2385. if (!mg_fopen(conn, path, "rb", filep)) {
  2386. send_http_error(conn, 500, http_500_error,
  2387. "fopen(%s): %s", path, strerror(ERRNO));
  2388. return;
  2389. }
  2390. fclose_on_exec(filep);
  2391. // If Range: header specified, act accordingly
  2392. r1 = r2 = 0;
  2393. hdr = mg_get_header(conn, "Range");
  2394. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
  2395. r1 >= 0 && r2 >= 0) {
  2396. conn->status_code = 206;
  2397. cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
  2398. mg_snprintf(conn, range, sizeof(range),
  2399. "Content-Range: bytes "
  2400. "%" INT64_FMT "-%"
  2401. INT64_FMT "/%" INT64_FMT "\r\n",
  2402. r1, r1 + cl - 1, filep->size);
  2403. msg = "Partial Content";
  2404. }
  2405. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2406. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2407. gmt_time_string(date, sizeof(date), &curtime);
  2408. gmt_time_string(lm, sizeof(lm), &filep->modification_time);
  2409. construct_etag(etag, sizeof(etag), filep);
  2410. (void) mg_printf(conn,
  2411. "HTTP/1.1 %d %s\r\n"
  2412. "Date: %s\r\n"
  2413. "Last-Modified: %s\r\n"
  2414. "Etag: %s\r\n"
  2415. "Content-Type: %.*s\r\n"
  2416. "Content-Length: %" INT64_FMT "\r\n"
  2417. "Connection: %s\r\n"
  2418. "Accept-Ranges: bytes\r\n"
  2419. "%s\r\n",
  2420. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2421. mime_vec.ptr, cl, suggest_connection_header(conn), range);
  2422. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2423. send_file_data(conn, filep, r1, cl);
  2424. }
  2425. mg_fclose(filep);
  2426. }
  2427. void mg_send_file(struct mg_connection *conn, const char *path) {
  2428. struct file file = STRUCT_FILE_INITIALIZER;
  2429. if (mg_stat(conn, path, &file)) {
  2430. handle_file_request(conn, path, &file);
  2431. } else {
  2432. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2433. }
  2434. }
  2435. // Parse HTTP headers from the given buffer, advance buffer to the point
  2436. // where parsing stopped.
  2437. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2438. int i;
  2439. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2440. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2441. ri->http_headers[i].value = skip(buf, "\r\n");
  2442. if (ri->http_headers[i].name[0] == '\0')
  2443. break;
  2444. ri->num_headers = i + 1;
  2445. }
  2446. }
  2447. static int is_valid_http_method(const char *method) {
  2448. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2449. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2450. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2451. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
  2452. }
  2453. // Parse HTTP request, fill in mg_request_info structure.
  2454. // This function modifies the buffer by NUL-terminating
  2455. // HTTP request components, header names and header values.
  2456. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2457. int is_request, request_length = get_request_len(buf, len);
  2458. if (request_length > 0) {
  2459. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2460. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2461. ri->num_headers = 0;
  2462. buf[request_length - 1] = '\0';
  2463. // RFC says that all initial whitespaces should be ingored
  2464. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2465. buf++;
  2466. }
  2467. ri->request_method = skip(&buf, " ");
  2468. ri->uri = skip(&buf, " ");
  2469. ri->http_version = skip(&buf, "\r\n");
  2470. if (((is_request = is_valid_http_method(ri->request_method)) &&
  2471. memcmp(ri->http_version, "HTTP/", 5) != 0) ||
  2472. (!is_request && memcmp(ri->request_method, "HTTP/", 5)) != 0) {
  2473. request_length = -1;
  2474. } else {
  2475. if (is_request) {
  2476. ri->http_version += 5;
  2477. }
  2478. parse_http_headers(&buf, ri);
  2479. }
  2480. }
  2481. return request_length;
  2482. }
  2483. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2484. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2485. // buffer (which marks the end of HTTP request). Buffer buf may already
  2486. // have some data. The length of the data is stored in nread.
  2487. // Upon every read operation, increase nread by the number of bytes read.
  2488. static int read_request(FILE *fp, struct mg_connection *conn,
  2489. char *buf, int bufsiz, int *nread) {
  2490. int request_len, n = 0;
  2491. request_len = get_request_len(buf, *nread);
  2492. while (*nread < bufsiz && request_len == 0 &&
  2493. (n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
  2494. *nread += n;
  2495. assert(*nread <= bufsiz);
  2496. request_len = get_request_len(buf, *nread);
  2497. }
  2498. return request_len <= 0 && n <= 0 ? -1 : request_len;
  2499. }
  2500. // For given directory path, substitute it to valid index file.
  2501. // Return 0 if index file has been found, -1 if not found.
  2502. // If the file is found, it's stats is returned in stp.
  2503. static int substitute_index_file(struct mg_connection *conn, char *path,
  2504. size_t path_len, struct file *filep) {
  2505. const char *list = conn->ctx->config[INDEX_FILES];
  2506. struct file file = STRUCT_FILE_INITIALIZER;
  2507. struct vec filename_vec;
  2508. size_t n = strlen(path);
  2509. int found = 0;
  2510. // The 'path' given to us points to the directory. Remove all trailing
  2511. // directory separator characters from the end of the path, and
  2512. // then append single directory separator character.
  2513. while (n > 0 && path[n - 1] == '/') {
  2514. n--;
  2515. }
  2516. path[n] = '/';
  2517. // Traverse index files list. For each entry, append it to the given
  2518. // path and see if the file exists. If it exists, break the loop
  2519. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2520. // Ignore too long entries that may overflow path buffer
  2521. if (filename_vec.len > path_len - (n + 2))
  2522. continue;
  2523. // Prepare full path to the index file
  2524. mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2525. // Does it exist?
  2526. if (mg_stat(conn, path, &file)) {
  2527. // Yes it does, break the loop
  2528. *filep = file;
  2529. found = 1;
  2530. break;
  2531. }
  2532. }
  2533. // If no index file exists, restore directory path
  2534. if (!found) {
  2535. path[n] = '\0';
  2536. }
  2537. return found;
  2538. }
  2539. // Return True if we should reply 304 Not Modified.
  2540. static int is_not_modified(const struct mg_connection *conn,
  2541. const struct file *filep) {
  2542. char etag[64];
  2543. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2544. const char *inm = mg_get_header(conn, "If-None-Match");
  2545. construct_etag(etag, sizeof(etag), filep);
  2546. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2547. (ims != NULL && filep->modification_time <= parse_date_string(ims));
  2548. }
  2549. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2550. SOCKET sock, SSL *ssl) {
  2551. const char *expect, *body;
  2552. char buf[MG_BUF_LEN];
  2553. int to_read, nread, buffered_len, success = 0;
  2554. expect = mg_get_header(conn, "Expect");
  2555. assert(fp != NULL);
  2556. if (conn->content_len == -1) {
  2557. send_http_error(conn, 411, "Length Required", "%s", "");
  2558. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2559. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2560. } else {
  2561. if (expect != NULL) {
  2562. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2563. }
  2564. body = conn->buf + conn->request_len + conn->consumed_content;
  2565. buffered_len = &conn->buf[conn->data_len] - body;
  2566. assert(buffered_len >= 0);
  2567. assert(conn->consumed_content == 0);
  2568. if (buffered_len > 0) {
  2569. if ((int64_t) buffered_len > conn->content_len) {
  2570. buffered_len = (int) conn->content_len;
  2571. }
  2572. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2573. conn->consumed_content += buffered_len;
  2574. }
  2575. nread = 0;
  2576. while (conn->consumed_content < conn->content_len) {
  2577. to_read = sizeof(buf);
  2578. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2579. to_read = (int) (conn->content_len - conn->consumed_content);
  2580. }
  2581. nread = pull(NULL, conn, buf, to_read);
  2582. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2583. break;
  2584. }
  2585. conn->consumed_content += nread;
  2586. }
  2587. if (conn->consumed_content == conn->content_len) {
  2588. success = nread >= 0;
  2589. }
  2590. // Each error code path in this function must send an error
  2591. if (!success) {
  2592. send_http_error(conn, 577, http_500_error, "%s", "");
  2593. }
  2594. }
  2595. return success;
  2596. }
  2597. #if !defined(NO_CGI)
  2598. // This structure helps to create an environment for the spawned CGI program.
  2599. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2600. // last element must be NULL.
  2601. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2602. // strings must reside in a contiguous buffer. The end of the buffer is
  2603. // marked by two '\0' characters.
  2604. // We satisfy both worlds: we create an envp array (which is vars), all
  2605. // entries are actually pointers inside buf.
  2606. struct cgi_env_block {
  2607. struct mg_connection *conn;
  2608. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2609. int len; // Space taken
  2610. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2611. int nvars; // Number of variables
  2612. };
  2613. static char *addenv(struct cgi_env_block *block,
  2614. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2615. PRINTF_ARGS(2, 3);
  2616. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2617. // pointer into the vars array.
  2618. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2619. int n, space;
  2620. char *added;
  2621. va_list ap;
  2622. // Calculate how much space is left in the buffer
  2623. space = sizeof(block->buf) - block->len - 2;
  2624. assert(space >= 0);
  2625. // Make a pointer to the free space int the buffer
  2626. added = block->buf + block->len;
  2627. // Copy VARIABLE=VALUE\0 string into the free space
  2628. va_start(ap, fmt);
  2629. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2630. va_end(ap);
  2631. // Make sure we do not overflow buffer and the envp array
  2632. if (n > 0 && n + 1 < space &&
  2633. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2634. // Append a pointer to the added string into the envp array
  2635. block->vars[block->nvars++] = added;
  2636. // Bump up used length counter. Include \0 terminator
  2637. block->len += n + 1;
  2638. } else {
  2639. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2640. }
  2641. return added;
  2642. }
  2643. static void prepare_cgi_environment(struct mg_connection *conn,
  2644. const char *prog,
  2645. struct cgi_env_block *blk) {
  2646. const char *s, *slash;
  2647. struct vec var_vec;
  2648. char *p, src_addr[20];
  2649. int i;
  2650. blk->len = blk->nvars = 0;
  2651. blk->conn = conn;
  2652. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2653. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2654. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2655. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2656. // Prepare the environment block
  2657. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2658. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2659. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2660. // TODO(lsm): fix this for IPv6 case
  2661. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2662. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2663. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2664. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2665. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2666. // SCRIPT_NAME
  2667. assert(conn->request_info.uri[0] == '/');
  2668. slash = strrchr(conn->request_info.uri, '/');
  2669. if ((s = strrchr(prog, '/')) == NULL)
  2670. s = prog;
  2671. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2672. conn->request_info.uri, s);
  2673. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2674. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2675. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2676. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2677. addenv(blk, "CONTENT_TYPE=%s", s);
  2678. if (conn->request_info.query_string != NULL)
  2679. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2680. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2681. addenv(blk, "CONTENT_LENGTH=%s", s);
  2682. if ((s = getenv("PATH")) != NULL)
  2683. addenv(blk, "PATH=%s", s);
  2684. if (conn->path_info != NULL) {
  2685. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2686. }
  2687. #if defined(_WIN32)
  2688. if ((s = getenv("COMSPEC")) != NULL) {
  2689. addenv(blk, "COMSPEC=%s", s);
  2690. }
  2691. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2692. addenv(blk, "SYSTEMROOT=%s", s);
  2693. }
  2694. if ((s = getenv("SystemDrive")) != NULL) {
  2695. addenv(blk, "SystemDrive=%s", s);
  2696. }
  2697. #else
  2698. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2699. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2700. #endif // _WIN32
  2701. if ((s = getenv("PERLLIB")) != NULL)
  2702. addenv(blk, "PERLLIB=%s", s);
  2703. if (conn->request_info.remote_user != NULL) {
  2704. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2705. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2706. }
  2707. // Add all headers as HTTP_* variables
  2708. for (i = 0; i < conn->request_info.num_headers; i++) {
  2709. p = addenv(blk, "HTTP_%s=%s",
  2710. conn->request_info.http_headers[i].name,
  2711. conn->request_info.http_headers[i].value);
  2712. // Convert variable name into uppercase, and change - to _
  2713. for (; *p != '=' && *p != '\0'; p++) {
  2714. if (*p == '-')
  2715. *p = '_';
  2716. *p = (char) toupper(* (unsigned char *) p);
  2717. }
  2718. }
  2719. // Add user-specified variables
  2720. s = conn->ctx->config[CGI_ENVIRONMENT];
  2721. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2722. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2723. }
  2724. blk->vars[blk->nvars++] = NULL;
  2725. blk->buf[blk->len++] = '\0';
  2726. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2727. assert(blk->len > 0);
  2728. assert(blk->len < (int) sizeof(blk->buf));
  2729. }
  2730. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2731. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2732. const char *status, *status_text;
  2733. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2734. struct mg_request_info ri;
  2735. struct cgi_env_block blk;
  2736. FILE *in, *out;
  2737. struct file fout = STRUCT_FILE_INITIALIZER;
  2738. pid_t pid;
  2739. prepare_cgi_environment(conn, prog, &blk);
  2740. // CGI must be executed in its own directory. 'dir' must point to the
  2741. // directory containing executable program, 'p' must point to the
  2742. // executable program name relative to 'dir'.
  2743. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2744. if ((p = strrchr(dir, '/')) != NULL) {
  2745. *p++ = '\0';
  2746. } else {
  2747. dir[0] = '.', dir[1] = '\0';
  2748. p = (char *) prog;
  2749. }
  2750. pid = (pid_t) -1;
  2751. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2752. in = out = NULL;
  2753. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2754. send_http_error(conn, 500, http_500_error,
  2755. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2756. goto done;
  2757. }
  2758. pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
  2759. dir);
  2760. // spawn_process() must close those!
  2761. // If we don't mark them as closed, close() attempt before
  2762. // return from this function throws an exception on Windows.
  2763. // Windows does not like when closed descriptor is closed again.
  2764. fd_stdin[0] = fd_stdout[1] = -1;
  2765. if (pid == (pid_t) -1) {
  2766. send_http_error(conn, 500, http_500_error,
  2767. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2768. goto done;
  2769. }
  2770. if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2771. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2772. send_http_error(conn, 500, http_500_error,
  2773. "fopen: %s", strerror(ERRNO));
  2774. goto done;
  2775. }
  2776. setbuf(in, NULL);
  2777. setbuf(out, NULL);
  2778. fout.fp = out;
  2779. // Send POST data to the CGI process if needed
  2780. if (!strcmp(conn->request_info.request_method, "POST") &&
  2781. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2782. goto done;
  2783. }
  2784. // Close so child gets an EOF.
  2785. fclose(in);
  2786. in = NULL;
  2787. fd_stdin[1] = -1;
  2788. // Now read CGI reply into a buffer. We need to set correct
  2789. // status code, thus we need to see all HTTP headers first.
  2790. // Do not send anything back to client, until we buffer in all
  2791. // HTTP headers.
  2792. data_len = 0;
  2793. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2794. if (headers_len <= 0) {
  2795. send_http_error(conn, 500, http_500_error,
  2796. "CGI program sent malformed or too big (>%u bytes) "
  2797. "HTTP headers: [%.*s]",
  2798. (unsigned) sizeof(buf), data_len, buf);
  2799. goto done;
  2800. }
  2801. pbuf = buf;
  2802. buf[headers_len - 1] = '\0';
  2803. parse_http_headers(&pbuf, &ri);
  2804. // Make up and send the status line
  2805. status_text = "OK";
  2806. if ((status = get_header(&ri, "Status")) != NULL) {
  2807. conn->status_code = atoi(status);
  2808. status_text = status;
  2809. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2810. status_text++;
  2811. }
  2812. } else if (get_header(&ri, "Location") != NULL) {
  2813. conn->status_code = 302;
  2814. } else {
  2815. conn->status_code = 200;
  2816. }
  2817. if (get_header(&ri, "Connection") != NULL &&
  2818. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2819. conn->must_close = 1;
  2820. }
  2821. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2822. status_text);
  2823. // Send headers
  2824. for (i = 0; i < ri.num_headers; i++) {
  2825. mg_printf(conn, "%s: %s\r\n",
  2826. ri.http_headers[i].name, ri.http_headers[i].value);
  2827. }
  2828. mg_write(conn, "\r\n", 2);
  2829. // Send chunk of data that may have been read after the headers
  2830. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2831. (size_t)(data_len - headers_len));
  2832. // Read the rest of CGI output and send to the client
  2833. send_file_data(conn, &fout, 0, INT64_MAX);
  2834. done:
  2835. if (pid != (pid_t) -1) {
  2836. kill(pid, SIGKILL);
  2837. }
  2838. if (fd_stdin[0] != -1) {
  2839. close(fd_stdin[0]);
  2840. }
  2841. if (fd_stdout[1] != -1) {
  2842. close(fd_stdout[1]);
  2843. }
  2844. if (in != NULL) {
  2845. fclose(in);
  2846. } else if (fd_stdin[1] != -1) {
  2847. close(fd_stdin[1]);
  2848. }
  2849. if (out != NULL) {
  2850. fclose(out);
  2851. } else if (fd_stdout[0] != -1) {
  2852. close(fd_stdout[0]);
  2853. }
  2854. }
  2855. #endif // !NO_CGI
  2856. // For a given PUT path, create all intermediate subdirectories
  2857. // for given path. Return 0 if the path itself is a directory,
  2858. // or -1 on error, 1 if OK.
  2859. static int put_dir(struct mg_connection *conn, const char *path) {
  2860. char buf[PATH_MAX];
  2861. const char *s, *p;
  2862. struct file file = STRUCT_FILE_INITIALIZER;
  2863. int len, res = 1;
  2864. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  2865. len = p - path;
  2866. if (len >= (int) sizeof(buf)) {
  2867. res = -1;
  2868. break;
  2869. }
  2870. memcpy(buf, path, len);
  2871. buf[len] = '\0';
  2872. // Try to create intermediate directory
  2873. DEBUG_TRACE(("mkdir(%s)", buf));
  2874. if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
  2875. res = -1;
  2876. break;
  2877. }
  2878. // Is path itself a directory?
  2879. if (p[1] == '\0') {
  2880. res = 0;
  2881. }
  2882. }
  2883. return res;
  2884. }
  2885. static void put_file(struct mg_connection *conn, const char *path) {
  2886. struct file file = STRUCT_FILE_INITIALIZER;
  2887. const char *range;
  2888. int64_t r1, r2;
  2889. int rc;
  2890. conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
  2891. if ((rc = put_dir(conn, path)) == 0) {
  2892. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2893. } else if (rc == -1) {
  2894. send_http_error(conn, 500, http_500_error,
  2895. "put_dir(%s): %s", path, strerror(ERRNO));
  2896. } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
  2897. mg_fclose(&file);
  2898. send_http_error(conn, 500, http_500_error,
  2899. "fopen(%s): %s", path, strerror(ERRNO));
  2900. } else {
  2901. fclose_on_exec(&file);
  2902. range = mg_get_header(conn, "Content-Range");
  2903. r1 = r2 = 0;
  2904. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  2905. conn->status_code = 206;
  2906. fseeko(file.fp, r1, SEEK_SET);
  2907. }
  2908. if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
  2909. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2910. }
  2911. mg_fclose(&file);
  2912. }
  2913. }
  2914. static void send_ssi_file(struct mg_connection *, const char *,
  2915. struct file *, int);
  2916. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  2917. char *tag, int include_level) {
  2918. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  2919. struct file file = STRUCT_FILE_INITIALIZER;
  2920. // sscanf() is safe here, since send_ssi_file() also uses buffer
  2921. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  2922. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  2923. // File name is relative to the webserver root
  2924. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  2925. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  2926. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
  2927. // File name is relative to the webserver working directory
  2928. // or it is absolute system path
  2929. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  2930. } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  2931. // File name is relative to the currect document
  2932. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  2933. if ((p = strrchr(path, '/')) != NULL) {
  2934. p[1] = '\0';
  2935. }
  2936. (void) mg_snprintf(conn, path + strlen(path),
  2937. sizeof(path) - strlen(path), "%s", file_name);
  2938. } else {
  2939. cry(conn, "Bad SSI #include: [%s]", tag);
  2940. return;
  2941. }
  2942. if (!mg_fopen(conn, path, "rb", &file)) {
  2943. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  2944. tag, path, strerror(ERRNO));
  2945. } else {
  2946. fclose_on_exec(&file);
  2947. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  2948. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  2949. send_ssi_file(conn, path, &file, include_level + 1);
  2950. } else {
  2951. send_file_data(conn, &file, 0, INT64_MAX);
  2952. }
  2953. mg_fclose(&file);
  2954. }
  2955. }
  2956. #if !defined(NO_POPEN)
  2957. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  2958. char cmd[MG_BUF_LEN];
  2959. struct file file = STRUCT_FILE_INITIALIZER;
  2960. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  2961. cry(conn, "Bad SSI #exec: [%s]", tag);
  2962. } else if ((file.fp = popen(cmd, "r")) == NULL) {
  2963. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  2964. } else {
  2965. send_file_data(conn, &file, 0, INT64_MAX);
  2966. pclose(file.fp);
  2967. }
  2968. }
  2969. #endif // !NO_POPEN
  2970. static int mg_fgetc(struct file *filep, int offset) {
  2971. if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
  2972. return ((unsigned char *) filep->membuf)[offset];
  2973. } else if (filep->fp != NULL) {
  2974. return fgetc(filep->fp);
  2975. } else {
  2976. return EOF;
  2977. }
  2978. }
  2979. static void send_ssi_file(struct mg_connection *conn, const char *path,
  2980. struct file *filep, int include_level) {
  2981. char buf[MG_BUF_LEN];
  2982. int ch, offset, len, in_ssi_tag;
  2983. if (include_level > 10) {
  2984. cry(conn, "SSI #include level is too deep (%s)", path);
  2985. return;
  2986. }
  2987. in_ssi_tag = len = offset = 0;
  2988. while ((ch = mg_fgetc(filep, offset)) != EOF) {
  2989. if (in_ssi_tag && ch == '>') {
  2990. in_ssi_tag = 0;
  2991. buf[len++] = (char) ch;
  2992. buf[len] = '\0';
  2993. assert(len <= (int) sizeof(buf));
  2994. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  2995. // Not an SSI tag, pass it
  2996. (void) mg_write(conn, buf, (size_t) len);
  2997. } else {
  2998. if (!memcmp(buf + 5, "include", 7)) {
  2999. do_ssi_include(conn, path, buf + 12, include_level);
  3000. #if !defined(NO_POPEN)
  3001. } else if (!memcmp(buf + 5, "exec", 4)) {
  3002. do_ssi_exec(conn, buf + 9);
  3003. #endif // !NO_POPEN
  3004. } else {
  3005. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  3006. }
  3007. }
  3008. len = 0;
  3009. } else if (in_ssi_tag) {
  3010. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  3011. // Not an SSI tag
  3012. in_ssi_tag = 0;
  3013. } else if (len == (int) sizeof(buf) - 2) {
  3014. cry(conn, "%s: SSI tag is too large", path);
  3015. len = 0;
  3016. }
  3017. buf[len++] = ch & 0xff;
  3018. } else if (ch == '<') {
  3019. in_ssi_tag = 1;
  3020. if (len > 0) {
  3021. mg_write(conn, buf, (size_t) len);
  3022. }
  3023. len = 0;
  3024. buf[len++] = ch & 0xff;
  3025. } else {
  3026. buf[len++] = ch & 0xff;
  3027. if (len == (int) sizeof(buf)) {
  3028. mg_write(conn, buf, (size_t) len);
  3029. len = 0;
  3030. }
  3031. }
  3032. }
  3033. // Send the rest of buffered data
  3034. if (len > 0) {
  3035. mg_write(conn, buf, (size_t) len);
  3036. }
  3037. }
  3038. static void handle_ssi_file_request(struct mg_connection *conn,
  3039. const char *path) {
  3040. struct file file = STRUCT_FILE_INITIALIZER;
  3041. if (!mg_fopen(conn, path, "rb", &file)) {
  3042. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  3043. strerror(ERRNO));
  3044. } else {
  3045. conn->must_close = 1;
  3046. fclose_on_exec(&file);
  3047. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  3048. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  3049. suggest_connection_header(conn));
  3050. send_ssi_file(conn, path, &file, 0);
  3051. mg_fclose(&file);
  3052. }
  3053. }
  3054. static void send_options(struct mg_connection *conn) {
  3055. conn->status_code = 200;
  3056. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3057. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
  3058. "DAV: 1\r\n\r\n");
  3059. }
  3060. // Writes PROPFIND properties for a collection element
  3061. static void print_props(struct mg_connection *conn, const char* uri,
  3062. struct file *filep) {
  3063. char mtime[64];
  3064. gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
  3065. conn->num_bytes_sent += mg_printf(conn,
  3066. "<d:response>"
  3067. "<d:href>%s</d:href>"
  3068. "<d:propstat>"
  3069. "<d:prop>"
  3070. "<d:resourcetype>%s</d:resourcetype>"
  3071. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3072. "<d:getlastmodified>%s</d:getlastmodified>"
  3073. "</d:prop>"
  3074. "<d:status>HTTP/1.1 200 OK</d:status>"
  3075. "</d:propstat>"
  3076. "</d:response>\n",
  3077. uri,
  3078. filep->is_directory ? "<d:collection/>" : "",
  3079. filep->size,
  3080. mtime);
  3081. }
  3082. static void print_dav_dir_entry(struct de *de, void *data) {
  3083. char href[PATH_MAX];
  3084. struct mg_connection *conn = (struct mg_connection *) data;
  3085. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3086. conn->request_info.uri, de->file_name);
  3087. print_props(conn, href, &de->file);
  3088. }
  3089. static void handle_propfind(struct mg_connection *conn, const char *path,
  3090. struct file *filep) {
  3091. const char *depth = mg_get_header(conn, "Depth");
  3092. conn->must_close = 1;
  3093. conn->status_code = 207;
  3094. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3095. "Connection: close\r\n"
  3096. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3097. conn->num_bytes_sent += mg_printf(conn,
  3098. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3099. "<d:multistatus xmlns:d='DAV:'>\n");
  3100. // Print properties for the requested resource itself
  3101. print_props(conn, conn->request_info.uri, filep);
  3102. // If it is a directory, print directory entries too if Depth is not 0
  3103. if (filep->is_directory &&
  3104. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3105. (depth == NULL || strcmp(depth, "0") != 0)) {
  3106. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3107. }
  3108. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3109. }
  3110. #if defined(USE_WEBSOCKET)
  3111. // START OF SHA-1 code
  3112. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3113. #define SHA1HANDSOFF
  3114. #if defined(__sun)
  3115. #include "solarisfixes.h"
  3116. #endif
  3117. union char64long16 { unsigned char c[64]; uint32_t l[16]; };
  3118. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3119. static uint32_t blk0(union char64long16 *block, int i) {
  3120. // Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
  3121. if (!is_big_endian()) {
  3122. block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
  3123. (rol(block->l[i], 8) & 0x00FF00FF);
  3124. }
  3125. return block->l[i];
  3126. }
  3127. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3128. ^block->l[(i+2)&15]^block->l[i&15],1))
  3129. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
  3130. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3131. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3132. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3133. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3134. typedef struct {
  3135. uint32_t state[5];
  3136. uint32_t count[2];
  3137. unsigned char buffer[64];
  3138. } SHA1_CTX;
  3139. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3140. uint32_t a, b, c, d, e;
  3141. union char64long16 block[1];
  3142. memcpy(block, buffer, 64);
  3143. a = state[0];
  3144. b = state[1];
  3145. c = state[2];
  3146. d = state[3];
  3147. e = state[4];
  3148. 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);
  3149. 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);
  3150. 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);
  3151. 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);
  3152. 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);
  3153. 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);
  3154. 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);
  3155. 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);
  3156. 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);
  3157. 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);
  3158. 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);
  3159. 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);
  3160. 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);
  3161. 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);
  3162. 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);
  3163. 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);
  3164. 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);
  3165. 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);
  3166. 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);
  3167. 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);
  3168. state[0] += a;
  3169. state[1] += b;
  3170. state[2] += c;
  3171. state[3] += d;
  3172. state[4] += e;
  3173. a = b = c = d = e = 0;
  3174. memset(block, '\0', sizeof(block));
  3175. }
  3176. static void SHA1Init(SHA1_CTX* context) {
  3177. context->state[0] = 0x67452301;
  3178. context->state[1] = 0xEFCDAB89;
  3179. context->state[2] = 0x98BADCFE;
  3180. context->state[3] = 0x10325476;
  3181. context->state[4] = 0xC3D2E1F0;
  3182. context->count[0] = context->count[1] = 0;
  3183. }
  3184. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3185. uint32_t len) {
  3186. uint32_t i, j;
  3187. j = context->count[0];
  3188. if ((context->count[0] += len << 3) < j)
  3189. context->count[1]++;
  3190. context->count[1] += (len>>29);
  3191. j = (j >> 3) & 63;
  3192. if ((j + len) > 63) {
  3193. memcpy(&context->buffer[j], data, (i = 64-j));
  3194. SHA1Transform(context->state, context->buffer);
  3195. for ( ; i + 63 < len; i += 64) {
  3196. SHA1Transform(context->state, &data[i]);
  3197. }
  3198. j = 0;
  3199. }
  3200. else i = 0;
  3201. memcpy(&context->buffer[j], &data[i], len - i);
  3202. }
  3203. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3204. unsigned i;
  3205. unsigned char finalcount[8], c;
  3206. for (i = 0; i < 8; i++) {
  3207. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3208. >> ((3-(i & 3)) * 8) ) & 255);
  3209. }
  3210. c = 0200;
  3211. SHA1Update(context, &c, 1);
  3212. while ((context->count[0] & 504) != 448) {
  3213. c = 0000;
  3214. SHA1Update(context, &c, 1);
  3215. }
  3216. SHA1Update(context, finalcount, 8);
  3217. for (i = 0; i < 20; i++) {
  3218. digest[i] = (unsigned char)
  3219. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3220. }
  3221. memset(context, '\0', sizeof(*context));
  3222. memset(&finalcount, '\0', sizeof(finalcount));
  3223. }
  3224. // END OF SHA1 CODE
  3225. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3226. static const char *b64 =
  3227. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3228. int i, j, a, b, c;
  3229. for (i = j = 0; i < src_len; i += 3) {
  3230. a = src[i];
  3231. b = i + 1 >= src_len ? 0 : src[i + 1];
  3232. c = i + 2 >= src_len ? 0 : src[i + 2];
  3233. dst[j++] = b64[a >> 2];
  3234. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3235. if (i + 1 < src_len) {
  3236. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3237. }
  3238. if (i + 2 < src_len) {
  3239. dst[j++] = b64[c & 63];
  3240. }
  3241. }
  3242. while (j % 4 != 0) {
  3243. dst[j++] = '=';
  3244. }
  3245. dst[j++] = '\0';
  3246. }
  3247. static void send_websocket_handshake(struct mg_connection *conn) {
  3248. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3249. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3250. SHA1_CTX sha_ctx;
  3251. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3252. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3253. SHA1Init(&sha_ctx);
  3254. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3255. SHA1Final((unsigned char *) sha, &sha_ctx);
  3256. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3257. mg_printf(conn, "%s%s%s",
  3258. "HTTP/1.1 101 Switching Protocols\r\n"
  3259. "Upgrade: websocket\r\n"
  3260. "Connection: Upgrade\r\n"
  3261. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3262. }
  3263. static void read_websocket(struct mg_connection *conn) {
  3264. unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
  3265. int n;
  3266. size_t i, len, mask_len, data_len, header_len, body_len;
  3267. char mem[4 * 1024], *data;
  3268. assert(conn->content_len == 0);
  3269. for (;;) {
  3270. header_len = 0;
  3271. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3272. len = buf[1] & 127;
  3273. mask_len = buf[1] & 128 ? 4 : 0;
  3274. if (len < 126 && body_len >= mask_len) {
  3275. data_len = len;
  3276. header_len = 2 + mask_len;
  3277. } else if (len == 126 && body_len >= 4 + mask_len) {
  3278. header_len = 4 + mask_len;
  3279. data_len = ((((int) buf[2]) << 8) + buf[3]);
  3280. } else if (body_len >= 10 + mask_len) {
  3281. header_len = 10 + mask_len;
  3282. data_len = (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
  3283. htonl(* (uint32_t *) &buf[6]);
  3284. }
  3285. }
  3286. if (header_len > 0) {
  3287. // Allocate space to hold websocket payload
  3288. data = mem;
  3289. if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
  3290. // Allocation failed, exit the loop and then close the connection
  3291. // TODO: notify user about the failure
  3292. break;
  3293. }
  3294. // Read frame payload into the allocated buffer.
  3295. assert(body_len >= header_len);
  3296. if (data_len + header_len > body_len) {
  3297. len = body_len - header_len;
  3298. memcpy(data, buf + header_len, len);
  3299. // TODO: handle pull error
  3300. pull(NULL, conn, data + len, data_len - len);
  3301. conn->data_len = 0;
  3302. } else {
  3303. len = data_len + header_len;
  3304. memcpy(data, buf + header_len, data_len);
  3305. memmove(buf, buf + len, body_len - len);
  3306. conn->data_len -= len;
  3307. }
  3308. // Apply mask if necessary
  3309. if (mask_len > 0) {
  3310. for (i = 0; i < data_len; i++) {
  3311. data[i] ^= buf[header_len - mask_len + (i % 4)];
  3312. }
  3313. }
  3314. // Exit the loop if callback signalled to exit,
  3315. // or "connection close" opcode received.
  3316. if ((conn->ctx->callbacks.websocket_data != NULL &&
  3317. !conn->ctx->callbacks.websocket_data(conn, buf[0], data, data_len)) ||
  3318. (buf[0] & 0xf) == 8) { // Opcode == 8, connection close
  3319. break;
  3320. }
  3321. if (data != mem) {
  3322. free(data);
  3323. }
  3324. // Not breaking the loop, process next websocket frame.
  3325. } else {
  3326. // Buffering websocket request
  3327. if ((n = pull(NULL, conn, conn->buf + conn->data_len,
  3328. conn->buf_size - conn->data_len)) <= 0) {
  3329. break;
  3330. }
  3331. conn->data_len += n;
  3332. }
  3333. }
  3334. }
  3335. static void handle_websocket_request(struct mg_connection *conn) {
  3336. if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
  3337. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3338. } else if (conn->ctx->callbacks.websocket_connect != NULL &&
  3339. conn->ctx->callbacks.websocket_connect(conn) != 0) {
  3340. // Callback has returned non-zero, do not proceed with handshake
  3341. } else {
  3342. send_websocket_handshake(conn);
  3343. if (conn->ctx->callbacks.websocket_ready != NULL) {
  3344. conn->ctx->callbacks.websocket_ready(conn);
  3345. }
  3346. read_websocket(conn);
  3347. }
  3348. }
  3349. static int is_websocket_request(const struct mg_connection *conn) {
  3350. const char *host, *upgrade, *connection, *version, *key;
  3351. host = mg_get_header(conn, "Host");
  3352. upgrade = mg_get_header(conn, "Upgrade");
  3353. connection = mg_get_header(conn, "Connection");
  3354. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3355. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3356. return host != NULL && upgrade != NULL && connection != NULL &&
  3357. key != NULL && version != NULL &&
  3358. mg_strcasestr(upgrade, "websocket") != NULL &&
  3359. mg_strcasestr(connection, "Upgrade") != NULL;
  3360. }
  3361. #endif // !USE_WEBSOCKET
  3362. static int isbyte(int n) {
  3363. return n >= 0 && n <= 255;
  3364. }
  3365. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3366. int n, a, b, c, d, slash = 32, len = 0;
  3367. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3368. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3369. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3370. slash >= 0 && slash < 33) {
  3371. len = n;
  3372. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3373. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3374. }
  3375. return len;
  3376. }
  3377. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3378. int throttle = 0;
  3379. struct vec vec, val;
  3380. uint32_t net, mask;
  3381. char mult;
  3382. double v;
  3383. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3384. mult = ',';
  3385. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3386. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3387. continue;
  3388. }
  3389. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3390. if (vec.len == 1 && vec.ptr[0] == '*') {
  3391. throttle = (int) v;
  3392. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3393. if ((remote_ip & mask) == net) {
  3394. throttle = (int) v;
  3395. }
  3396. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3397. throttle = (int) v;
  3398. }
  3399. }
  3400. return throttle;
  3401. }
  3402. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3403. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3404. }
  3405. #ifdef USE_LUA
  3406. #ifdef _WIN32
  3407. static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
  3408. int offset) {
  3409. HANDLE fh = (HANDLE) _get_osfhandle(fd);
  3410. HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
  3411. void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
  3412. CloseHandle(mh);
  3413. return p;
  3414. }
  3415. #define munmap(x, y) UnmapViewOfFile(x)
  3416. #define MAP_FAILED NULL
  3417. #define MAP_PRIVATE 0
  3418. #define PROT_READ 0
  3419. #else
  3420. #include <sys/mman.h>
  3421. #endif
  3422. static void handle_request(struct mg_connection *);
  3423. static int handle_lsp_request(struct mg_connection *, const char *,
  3424. struct file *, struct lua_State *);
  3425. static int lsp_mg_error(lua_State *L) {
  3426. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3427. int top = lua_gettop(L);
  3428. if (top < 1) lua_pushstring(L, "unknown error");
  3429. // Get mg.onerror.
  3430. lua_getglobal(L, "mg");
  3431. lua_getfield(L, -1, "onerror");
  3432. // If mg.onerror is nil, silently stop processing chunks.
  3433. if (lua_isnil(L, -1)) {
  3434. lua_pushinteger(L, 1);
  3435. return 1;
  3436. }
  3437. // Call mg.onerror.
  3438. lua_pushvalue(L, top);
  3439. lua_remove(L, top);
  3440. if (lua_pcall(L, 1, 1, 0)) {
  3441. // If mg.onerror fails, cry the error message and stop processing chunks.
  3442. cry(conn, "mg.onerror failed: %s", lua_tostring(L, -1));
  3443. lua_pushinteger(L, 1);
  3444. return 1;
  3445. }
  3446. // Return the return value from mg.onerror. Non-0 = stop processing chunks.
  3447. return 1;
  3448. }
  3449. // Silently stop processing chunks.
  3450. static void lsp_abort(lua_State *L) {
  3451. int top = lua_gettop(L);
  3452. lua_getglobal(L, "mg");
  3453. lua_pushnil(L);
  3454. lua_setfield(L, -2, "onerror");
  3455. lua_settop(L, top);
  3456. lua_pushstring(L, "aborting");
  3457. lua_error(L);
  3458. }
  3459. static int lsp(struct mg_connection *conn, const char *path,
  3460. const char *p, int64_t len, lua_State *L) {
  3461. int i, j, result, pos = 0, lines = 1, lualines = 0;
  3462. char chunkname [MG_BUF_LEN];
  3463. for (i = 0; i < len; i++) {
  3464. if (p[i] == '\n') ++lines;
  3465. if (p[i] == '<' && p[i + 1] == '?') {
  3466. for (j = i + 1; j < len ; j++) {
  3467. if (p[j] == '\n') ++lualines;
  3468. if (p[j] == '?' && p[j + 1] == '>') {
  3469. mg_write(conn, p + pos, i - pos);
  3470. lua_pushlightuserdata(L, conn);
  3471. lua_pushcclosure(L, lsp_mg_error, 1);
  3472. snprintf (chunkname, sizeof(chunkname), "@%s+%i", path, lines);
  3473. if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), chunkname)) {
  3474. lua_pcall(L, 1, 1, 0);
  3475. result = lua_tointeger(L, -1);
  3476. if (result) return result;
  3477. } else {
  3478. lua_pcall(L, 0, 0, 1);
  3479. result = lua_tointeger(L, -1);
  3480. if (result) return result;
  3481. }
  3482. pos = j + 2;
  3483. i = pos - 1;
  3484. break;
  3485. }
  3486. }
  3487. if (lualines > 0) {
  3488. lines += lualines;
  3489. lualines = 0;
  3490. }
  3491. }
  3492. }
  3493. if (i > pos) {
  3494. mg_write(conn, p + pos, i - pos);
  3495. }
  3496. return 0;
  3497. }
  3498. static int lsp_mg_print(lua_State *L) {
  3499. int i, num_args;
  3500. const char *str;
  3501. size_t size;
  3502. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3503. num_args = lua_gettop(L);
  3504. for (i = 1; i <= num_args; i++) {
  3505. if (lua_isstring(L, i)) {
  3506. str = lua_tolstring(L, i, &size);
  3507. mg_write(conn, str, size);
  3508. }
  3509. }
  3510. return 0;
  3511. }
  3512. static int lsp_mg_read(lua_State *L) {
  3513. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3514. char buf[1024];
  3515. int len = mg_read(conn, buf, sizeof(buf));
  3516. lua_settop(L, 0);
  3517. lua_pushlstring(L, buf, len);
  3518. return 1;
  3519. }
  3520. // mg.include: Include another .lp file
  3521. static int lsp_mod_include(lua_State *L) {
  3522. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3523. struct file file = STRUCT_FILE_INITIALIZER;
  3524. if (handle_lsp_request(conn, lua_tostring(L, -1), &file, L)) {
  3525. // handle_lsp_request returned an error code, meaning an error occured in
  3526. // the included page and mg.onerror returned non-zero. Stop processing.
  3527. lsp_abort(L);
  3528. }
  3529. return 0;
  3530. }
  3531. // mg.cry: Log an error. Default value for mg.onerror.
  3532. static int lsp_mod_cry(lua_State *L){
  3533. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3534. cry(conn, "%s", lua_tostring(L, -1));
  3535. return 0;
  3536. }
  3537. // mg.redirect: Redirect the request (internally).
  3538. static int lsp_mod_redirect(lua_State *L) {
  3539. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3540. conn->request_info.uri = lua_tostring(L, -1);
  3541. handle_request(conn);
  3542. lsp_abort(L);
  3543. return 0;
  3544. }
  3545. static void reg_string(struct lua_State *L, const char *name, const char *val) {
  3546. lua_pushstring(L, name);
  3547. lua_pushstring(L, val);
  3548. lua_rawset(L, -3);
  3549. }
  3550. static void reg_int(struct lua_State *L, const char *name, int val) {
  3551. lua_pushstring(L, name);
  3552. lua_pushinteger(L, val);
  3553. lua_rawset(L, -3);
  3554. }
  3555. static void reg_function(struct lua_State *L, const char *name,
  3556. lua_CFunction func, struct mg_connection *conn) {
  3557. lua_pushstring(L, name);
  3558. lua_pushlightuserdata(L, conn);
  3559. lua_pushcclosure(L, func, 1);
  3560. lua_rawset(L, -3);
  3561. }
  3562. static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {
  3563. const struct mg_request_info *ri = mg_get_request_info(conn);
  3564. extern void luaL_openlibs(lua_State *);
  3565. int i;
  3566. luaL_openlibs(L);
  3567. #ifdef USE_LUA_SQLITE3
  3568. { extern int luaopen_lsqlite3(lua_State *); luaopen_lsqlite3(L); }
  3569. #endif
  3570. // Register "print" function which calls mg_write()
  3571. lua_pushlightuserdata(L, conn);
  3572. lua_pushcclosure(L, lsp_mg_print, 1);
  3573. lua_setglobal(L, "print");
  3574. // Register mg_read()
  3575. lua_pushlightuserdata(L, conn);
  3576. lua_pushcclosure(L, lsp_mg_read, 1);
  3577. lua_setglobal(L, "read");
  3578. // Register mg module
  3579. lua_newtable(L);
  3580. reg_function(L, "cry", lsp_mod_cry, conn);
  3581. reg_function(L, "include", lsp_mod_include, conn);
  3582. reg_function(L, "onerror", lsp_mod_cry, conn);
  3583. reg_function(L, "redirect", lsp_mod_redirect, conn);
  3584. reg_string(L, "version", MONGOOSE_VERSION);
  3585. lua_setglobal(L, "mg");
  3586. // Export request_info
  3587. lua_newtable(L);
  3588. reg_string(L, "request_method", ri->request_method);
  3589. reg_string(L, "uri", ri->uri);
  3590. reg_string(L, "http_version", ri->http_version);
  3591. reg_string(L, "query_string", ri->query_string);
  3592. reg_int(L, "remote_ip", ri->remote_ip);
  3593. reg_int(L, "remote_port", ri->remote_port);
  3594. reg_int(L, "num_headers", ri->num_headers);
  3595. lua_pushstring(L, "http_headers");
  3596. lua_newtable(L);
  3597. for (i = 0; i < ri->num_headers; i++) {
  3598. reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
  3599. }
  3600. lua_rawset(L, -3);
  3601. lua_setglobal(L, "request_info");
  3602. }
  3603. // Throw a lua error. Called from handle_lsp_request via mg.include
  3604. static void send_lua_error(struct lua_State *L,
  3605. PRINTF_FORMAT_STRING(const char *fmt), ...)
  3606. PRINTF_ARGS(2, 3);
  3607. static void send_lua_error(struct lua_State *L, const char *fmt, ...) {
  3608. char buf[MG_BUF_LEN];
  3609. va_list ap;
  3610. int len = 0;
  3611. va_start(ap, fmt);
  3612. len += vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
  3613. va_end(ap);
  3614. lua_pushstring(L, buf);
  3615. lua_error(L);
  3616. }
  3617. static int handle_lsp_request(struct mg_connection *conn, const char *path,
  3618. struct file *filep, struct lua_State *ls) {
  3619. void *p = NULL;
  3620. lua_State *L = NULL;
  3621. int error = 1;
  3622. if (!mg_stat(conn, path, filep) || !mg_fopen(conn, path, "r", filep)) {
  3623. if (ls == NULL) {
  3624. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3625. } else {
  3626. send_lua_error(ls, "File not found: %s", path);
  3627. }
  3628. } else if (filep->membuf == NULL &&
  3629. (p = mmap(NULL, (size_t) filep->size, PROT_READ, MAP_PRIVATE,
  3630. fileno(filep->fp), 0)) == MAP_FAILED) {
  3631. if (ls == NULL) {
  3632. send_http_error(conn, 500, http_500_error, "mmap(%s, %zu, %d): %s", path,
  3633. (size_t) filep->size, fileno(filep->fp), strerror(errno));
  3634. } else {
  3635. send_lua_error(ls, "mmap(%s, %zu, %d): %s", path,
  3636. (size_t) filep->size, fileno(filep->fp), strerror(errno));
  3637. }
  3638. } else if ((L = ls != NULL ? ls : luaL_newstate()) == NULL) {
  3639. send_http_error(conn, 500, http_500_error, "%s", "luaL_newstate failed");
  3640. } else {
  3641. // We're not sending HTTP headers here, Lua page must do it.
  3642. if (ls == NULL) {
  3643. prepare_lua_environment(conn, L);
  3644. if (conn->ctx->callbacks.init_lua != NULL) {
  3645. conn->ctx->callbacks.init_lua(conn, L);
  3646. }
  3647. }
  3648. error = lsp(conn, path, filep->membuf == NULL ? p : filep->membuf,
  3649. filep->size, L);
  3650. }
  3651. if (L && ls == NULL) lua_close(L);
  3652. if (p) munmap(p, filep->size);
  3653. mg_fclose(filep);
  3654. return error;
  3655. }
  3656. #endif // USE_LUA
  3657. int mg_upload(struct mg_connection *conn, const char *destination_dir) {
  3658. const char *content_type_header, *boundary_start;
  3659. char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
  3660. FILE *fp;
  3661. int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;
  3662. // Request looks like this:
  3663. //
  3664. // POST /upload HTTP/1.1
  3665. // Host: 127.0.0.1:8080
  3666. // Content-Length: 244894
  3667. // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
  3668. //
  3669. // ------WebKitFormBoundaryRVr
  3670. // Content-Disposition: form-data; name="file"; filename="accum.png"
  3671. // Content-Type: image/png
  3672. //
  3673. // <89>PNG
  3674. // <PNG DATA>
  3675. // ------WebKitFormBoundaryRVr
  3676. // Extract boundary string from the Content-Type header
  3677. if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
  3678. (boundary_start = mg_strcasestr(content_type_header,
  3679. "boundary=")) == NULL ||
  3680. (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
  3681. sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
  3682. boundary[0] == '\0') {
  3683. return num_uploaded_files;
  3684. }
  3685. boundary_len = strlen(boundary);
  3686. bl = boundary_len + 4; // \r\n--<boundary>
  3687. for (;;) {
  3688. // Pull in headers
  3689. assert(len >= 0 && len <= (int) sizeof(buf));
  3690. while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
  3691. len += n;
  3692. }
  3693. if ((headers_len = get_request_len(buf, len)) <= 0) {
  3694. break;
  3695. }
  3696. // Fetch file name.
  3697. fname[0] = '\0';
  3698. for (i = j = 0; i < headers_len; i++) {
  3699. if (buf[i] == '\r' && buf[i + 1] == '\n') {
  3700. buf[i] = buf[i + 1] = '\0';
  3701. // TODO(lsm): don't expect filename to be the 3rd field,
  3702. // parse the header properly instead.
  3703. sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
  3704. fname);
  3705. j = i + 2;
  3706. }
  3707. }
  3708. // Give up if the headers are not what we expect
  3709. if (fname[0] == '\0') {
  3710. break;
  3711. }
  3712. // Move data to the beginning of the buffer
  3713. assert(len >= headers_len);
  3714. memmove(buf, &buf[headers_len], len - headers_len);
  3715. len -= headers_len;
  3716. // We open the file with exclusive lock held. This guarantee us
  3717. // there is no other thread can save into the same file simultaneously.
  3718. fp = NULL;
  3719. // Construct destination file name. Do not allow paths to have slashes.
  3720. if ((s = strrchr(fname, '/')) == NULL) {
  3721. s = fname;
  3722. }
  3723. // Open file in binary mode. TODO: set an exclusive lock.
  3724. snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
  3725. if ((fp = fopen(path, "wb")) == NULL) {
  3726. break;
  3727. }
  3728. // Read POST data, write into file until boundary is found.
  3729. n = 0;
  3730. do {
  3731. len += n;
  3732. for (i = 0; i < len - bl; i++) {
  3733. if (!memcmp(&buf[i], "\r\n--", 4) &&
  3734. !memcmp(&buf[i + 4], boundary, boundary_len)) {
  3735. // Found boundary, that's the end of file data.
  3736. fwrite(buf, 1, i, fp);
  3737. fflush(fp);
  3738. num_uploaded_files++;
  3739. if (conn->ctx->callbacks.upload != NULL) {
  3740. conn->ctx->callbacks.upload(conn, path);
  3741. }
  3742. memmove(buf, &buf[i + bl], len - (i + bl));
  3743. len -= i + bl;
  3744. break;
  3745. }
  3746. }
  3747. if (len > bl) {
  3748. fwrite(buf, 1, len - bl, fp);
  3749. memmove(buf, &buf[len - bl], bl);
  3750. len = bl;
  3751. }
  3752. } while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
  3753. fclose(fp);
  3754. }
  3755. return num_uploaded_files;
  3756. }
  3757. static int is_put_or_delete_request(const struct mg_connection *conn) {
  3758. const char *s = conn->request_info.request_method;
  3759. return s != NULL && (!strcmp(s, "PUT") || !strcmp(s, "DELETE"));
  3760. }
  3761. static int get_first_ssl_listener_index(const struct mg_context *ctx) {
  3762. int i, index = -1;
  3763. for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
  3764. index = ctx->listening_sockets[i].is_ssl ? i : -1;
  3765. }
  3766. return index;
  3767. }
  3768. static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
  3769. char host[1025];
  3770. const char *host_header;
  3771. if ((host_header = mg_get_header(conn, "Host")) == NULL ||
  3772. sscanf(host_header, "%1024[^:]", host) == 0) {
  3773. // Cannot get host from the Host: header. Fallback to our IP address.
  3774. sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
  3775. }
  3776. mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
  3777. host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
  3778. lsa.sin.sin_port), conn->request_info.uri);
  3779. }
  3780. // This is the heart of the Mongoose's logic.
  3781. // This function is called when the request is read, parsed and validated,
  3782. // and Mongoose must decide what action to take: serve a file, or
  3783. // a directory, or call embedded function, etcetera.
  3784. static void handle_request(struct mg_connection *conn) {
  3785. struct mg_request_info *ri = &conn->request_info;
  3786. char path[PATH_MAX];
  3787. int uri_len, ssl_index;
  3788. struct file file = STRUCT_FILE_INITIALIZER;
  3789. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3790. * ((char *) conn->request_info.query_string++) = '\0';
  3791. }
  3792. uri_len = (int) strlen(ri->uri);
  3793. url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
  3794. remove_double_dots_and_double_slashes((char *) ri->uri);
  3795. convert_uri_to_file_name(conn, path, sizeof(path), &file);
  3796. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3797. get_remote_ip(conn), ri->uri);
  3798. DEBUG_TRACE(("%s", ri->uri));
  3799. // Perform redirect and auth checks before calling begin_request() handler.
  3800. // Otherwise, begin_request() would need to perform auth checks and redirects.
  3801. if (!conn->client.is_ssl && conn->client.ssl_redir &&
  3802. (ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
  3803. redirect_to_https_port(conn, ssl_index);
  3804. } else if (!is_put_or_delete_request(conn) &&
  3805. !check_authorization(conn, path)) {
  3806. send_authorization_request(conn);
  3807. } else if (conn->ctx->callbacks.begin_request != NULL &&
  3808. conn->ctx->callbacks.begin_request(conn)) {
  3809. // Do nothing, callback has served the request
  3810. #if defined(USE_WEBSOCKET)
  3811. } else if (is_websocket_request(conn)) {
  3812. handle_websocket_request(conn);
  3813. #endif
  3814. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3815. send_options(conn);
  3816. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3817. send_http_error(conn, 404, "Not Found", "Not Found");
  3818. } else if (is_put_or_delete_request(conn) &&
  3819. (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
  3820. is_authorized_for_put(conn) != 1)) {
  3821. send_authorization_request(conn);
  3822. } else if (!strcmp(ri->request_method, "PUT")) {
  3823. put_file(conn, path);
  3824. } else if (!strcmp(ri->request_method, "DELETE")) {
  3825. if (mg_remove(path) == 0) {
  3826. send_http_error(conn, 200, "OK", "%s", "");
  3827. } else {
  3828. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3829. strerror(ERRNO));
  3830. }
  3831. } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
  3832. must_hide_file(conn, path)) {
  3833. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3834. } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
  3835. mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3836. "Location: %s/\r\n\r\n", ri->uri);
  3837. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3838. handle_propfind(conn, path, &file);
  3839. } else if (file.is_directory &&
  3840. !substitute_index_file(conn, path, sizeof(path), &file)) {
  3841. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3842. handle_directory_request(conn, path);
  3843. } else {
  3844. send_http_error(conn, 403, "Directory Listing Denied",
  3845. "Directory listing denied");
  3846. }
  3847. #ifdef USE_LUA
  3848. } else if (match_prefix("**.lp$", 6, path) > 0) {
  3849. handle_lsp_request(conn, path, &file, NULL);
  3850. #endif
  3851. #if !defined(NO_CGI)
  3852. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3853. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3854. path) > 0) {
  3855. if (strcmp(ri->request_method, "POST") &&
  3856. strcmp(ri->request_method, "HEAD") &&
  3857. strcmp(ri->request_method, "GET")) {
  3858. send_http_error(conn, 501, "Not Implemented",
  3859. "Method %s is not implemented", ri->request_method);
  3860. } else {
  3861. handle_cgi_request(conn, path);
  3862. }
  3863. #endif // !NO_CGI
  3864. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3865. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3866. path) > 0) {
  3867. handle_ssi_file_request(conn, path);
  3868. } else if (is_not_modified(conn, &file)) {
  3869. send_http_error(conn, 304, "Not Modified", "%s", "");
  3870. } else {
  3871. handle_file_request(conn, path, &file);
  3872. }
  3873. }
  3874. static void close_all_listening_sockets(struct mg_context *ctx) {
  3875. int i;
  3876. for (i = 0; i < ctx->num_listening_sockets; i++) {
  3877. closesocket(ctx->listening_sockets[i].sock);
  3878. }
  3879. free(ctx->listening_sockets);
  3880. }
  3881. // Valid listening port specification is: [ip_address:]port[s]
  3882. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3883. // TODO(lsm): add parsing of the IPv6 address
  3884. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3885. int a, b, c, d, port, len;
  3886. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3887. // Also, all-zeroes in the socket address means binding to all addresses
  3888. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3889. memset(so, 0, sizeof(*so));
  3890. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  3891. // Bind to a specific IPv4 address
  3892. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3893. } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
  3894. len <= 0 ||
  3895. len > (int) vec->len ||
  3896. (vec->ptr[len] && vec->ptr[len] != 's' &&
  3897. vec->ptr[len] != 'r' && vec->ptr[len] != ',')) {
  3898. return 0;
  3899. }
  3900. so->is_ssl = vec->ptr[len] == 's';
  3901. so->ssl_redir = vec->ptr[len] == 'r';
  3902. #if defined(USE_IPV6)
  3903. so->lsa.sin6.sin6_family = AF_INET6;
  3904. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3905. #else
  3906. so->lsa.sin.sin_family = AF_INET;
  3907. so->lsa.sin.sin_port = htons((uint16_t) port);
  3908. #endif
  3909. return 1;
  3910. }
  3911. static int set_ports_option(struct mg_context *ctx) {
  3912. const char *list = ctx->config[LISTENING_PORTS];
  3913. int on = 1, success = 1;
  3914. #if defined(USE_IPV6)
  3915. int off = 0;
  3916. #endif
  3917. struct vec vec;
  3918. struct socket so;
  3919. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3920. if (!parse_port_string(&vec, &so)) {
  3921. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3922. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  3923. success = 0;
  3924. } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
  3925. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3926. success = 0;
  3927. } else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3928. INVALID_SOCKET ||
  3929. // On Windows, SO_REUSEADDR is recommended only for
  3930. // broadcast UDP sockets
  3931. setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
  3932. (void *) &on, sizeof(on)) != 0 ||
  3933. #if defined(USE_IPV6)
  3934. setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
  3935. sizeof(off)) != 0 ||
  3936. #endif
  3937. bind(so.sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
  3938. listen(so.sock, SOMAXCONN) != 0) {
  3939. cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
  3940. (int) vec.len, vec.ptr, strerror(ERRNO));
  3941. closesocket(so.sock);
  3942. success = 0;
  3943. } else {
  3944. set_close_on_exec(so.sock);
  3945. // TODO: handle realloc failure
  3946. ctx->listening_sockets = realloc(ctx->listening_sockets,
  3947. (ctx->num_listening_sockets + 1) *
  3948. sizeof(ctx->listening_sockets[0]));
  3949. ctx->listening_sockets[ctx->num_listening_sockets] = so;
  3950. ctx->num_listening_sockets++;
  3951. }
  3952. }
  3953. if (!success) {
  3954. close_all_listening_sockets(ctx);
  3955. }
  3956. return success;
  3957. }
  3958. static void log_header(const struct mg_connection *conn, const char *header,
  3959. FILE *fp) {
  3960. const char *header_value;
  3961. if ((header_value = mg_get_header(conn, header)) == NULL) {
  3962. (void) fprintf(fp, "%s", " -");
  3963. } else {
  3964. (void) fprintf(fp, " \"%s\"", header_value);
  3965. }
  3966. }
  3967. static void log_access(const struct mg_connection *conn) {
  3968. const struct mg_request_info *ri;
  3969. FILE *fp;
  3970. char date[64], src_addr[20];
  3971. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  3972. fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  3973. if (fp == NULL)
  3974. return;
  3975. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3976. localtime(&conn->birth_time));
  3977. ri = &conn->request_info;
  3978. flockfile(fp);
  3979. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  3980. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3981. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  3982. ri->request_method ? ri->request_method : "-",
  3983. ri->uri ? ri->uri : "-", ri->http_version,
  3984. conn->status_code, conn->num_bytes_sent);
  3985. log_header(conn, "Referer", fp);
  3986. log_header(conn, "User-Agent", fp);
  3987. fputc('\n', fp);
  3988. fflush(fp);
  3989. funlockfile(fp);
  3990. fclose(fp);
  3991. }
  3992. // Verify given socket address against the ACL.
  3993. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  3994. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  3995. int allowed, flag;
  3996. uint32_t net, mask;
  3997. struct vec vec;
  3998. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  3999. // If any ACL is set, deny by default
  4000. allowed = list == NULL ? '+' : '-';
  4001. while ((list = next_option(list, &vec, NULL)) != NULL) {
  4002. flag = vec.ptr[0];
  4003. if ((flag != '+' && flag != '-') ||
  4004. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  4005. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  4006. return -1;
  4007. }
  4008. if (net == (remote_ip & mask)) {
  4009. allowed = flag;
  4010. }
  4011. }
  4012. return allowed == '+';
  4013. }
  4014. #if !defined(_WIN32)
  4015. static int set_uid_option(struct mg_context *ctx) {
  4016. struct passwd *pw;
  4017. const char *uid = ctx->config[RUN_AS_USER];
  4018. int success = 0;
  4019. if (uid == NULL) {
  4020. success = 1;
  4021. } else {
  4022. if ((pw = getpwnam(uid)) == NULL) {
  4023. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  4024. } else if (setgid(pw->pw_gid) == -1) {
  4025. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  4026. } else if (setuid(pw->pw_uid) == -1) {
  4027. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  4028. } else {
  4029. success = 1;
  4030. }
  4031. }
  4032. return success;
  4033. }
  4034. #endif // !_WIN32
  4035. #if !defined(NO_SSL)
  4036. static pthread_mutex_t *ssl_mutexes;
  4037. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  4038. return (conn->ssl = SSL_new(s)) != NULL &&
  4039. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  4040. func(conn->ssl) == 1;
  4041. }
  4042. // Return OpenSSL error message
  4043. static const char *ssl_error(void) {
  4044. unsigned long err;
  4045. err = ERR_get_error();
  4046. return err == 0 ? "" : ERR_error_string(err, NULL);
  4047. }
  4048. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  4049. int line) {
  4050. (void) line;
  4051. (void) file;
  4052. if (mode & 1) { // 1 is CRYPTO_LOCK
  4053. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  4054. } else {
  4055. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  4056. }
  4057. }
  4058. static unsigned long ssl_id_callback(void) {
  4059. return (unsigned long) pthread_self();
  4060. }
  4061. #if !defined(NO_SSL_DL)
  4062. static int load_dll(struct mg_context *ctx, const char *dll_name,
  4063. struct ssl_func *sw) {
  4064. union {void *p; void (*fp)(void);} u;
  4065. void *dll_handle;
  4066. struct ssl_func *fp;
  4067. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  4068. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  4069. return 0;
  4070. }
  4071. for (fp = sw; fp->name != NULL; fp++) {
  4072. #ifdef _WIN32
  4073. // GetProcAddress() returns pointer to function
  4074. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  4075. #else
  4076. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  4077. // function pointers. We need to use a union to make a cast.
  4078. u.p = dlsym(dll_handle, fp->name);
  4079. #endif // _WIN32
  4080. if (u.fp == NULL) {
  4081. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  4082. return 0;
  4083. } else {
  4084. fp->ptr = u.fp;
  4085. }
  4086. }
  4087. return 1;
  4088. }
  4089. #endif // NO_SSL_DL
  4090. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  4091. static int set_ssl_option(struct mg_context *ctx) {
  4092. int i, size;
  4093. const char *pem;
  4094. // If PEM file is not specified, skip SSL initialization.
  4095. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
  4096. return 1;
  4097. }
  4098. #if !defined(NO_SSL_DL)
  4099. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  4100. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  4101. return 0;
  4102. }
  4103. #endif // NO_SSL_DL
  4104. // Initialize SSL library
  4105. SSL_library_init();
  4106. SSL_load_error_strings();
  4107. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  4108. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  4109. return 0;
  4110. }
  4111. // If user callback returned non-NULL, that means that user callback has
  4112. // set up certificate itself. In this case, skip sertificate setting.
  4113. if ((ctx->callbacks.init_ssl == NULL ||
  4114. !ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
  4115. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
  4116. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
  4117. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  4118. return 0;
  4119. }
  4120. if (pem != NULL) {
  4121. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  4122. }
  4123. // Initialize locking callbacks, needed for thread safety.
  4124. // http://www.openssl.org/support/faq.html#PROG1
  4125. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  4126. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  4127. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  4128. return 0;
  4129. }
  4130. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4131. pthread_mutex_init(&ssl_mutexes[i], NULL);
  4132. }
  4133. CRYPTO_set_locking_callback(&ssl_locking_callback);
  4134. CRYPTO_set_id_callback(&ssl_id_callback);
  4135. return 1;
  4136. }
  4137. static void uninitialize_ssl(struct mg_context *ctx) {
  4138. int i;
  4139. if (ctx->ssl_ctx != NULL) {
  4140. CRYPTO_set_locking_callback(NULL);
  4141. for (i = 0; i < CRYPTO_num_locks(); i++) {
  4142. pthread_mutex_destroy(&ssl_mutexes[i]);
  4143. }
  4144. CRYPTO_set_locking_callback(NULL);
  4145. CRYPTO_set_id_callback(NULL);
  4146. }
  4147. }
  4148. #endif // !NO_SSL
  4149. static int set_gpass_option(struct mg_context *ctx) {
  4150. struct file file = STRUCT_FILE_INITIALIZER;
  4151. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  4152. if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
  4153. cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
  4154. return 0;
  4155. }
  4156. return 1;
  4157. }
  4158. static int set_acl_option(struct mg_context *ctx) {
  4159. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  4160. }
  4161. static void reset_per_request_attributes(struct mg_connection *conn) {
  4162. conn->path_info = NULL;
  4163. conn->num_bytes_sent = conn->consumed_content = 0;
  4164. conn->status_code = -1;
  4165. conn->must_close = conn->request_len = conn->throttle = 0;
  4166. }
  4167. static void close_socket_gracefully(struct mg_connection *conn) {
  4168. #if defined(_WIN32)
  4169. char buf[MG_BUF_LEN];
  4170. int n;
  4171. #endif
  4172. struct linger linger;
  4173. // Set linger option to avoid socket hanging out after close. This prevent
  4174. // ephemeral port exhaust problem under high QPS.
  4175. linger.l_onoff = 1;
  4176. linger.l_linger = 1;
  4177. setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
  4178. (char *) &linger, sizeof(linger));
  4179. // Send FIN to the client
  4180. shutdown(conn->client.sock, SHUT_WR);
  4181. set_non_blocking_mode(conn->client.sock);
  4182. #if defined(_WIN32)
  4183. // Read and discard pending incoming data. If we do not do that and close the
  4184. // socket, the data in the send buffer may be discarded. This
  4185. // behaviour is seen on Windows, when client keeps sending data
  4186. // when server decides to close the connection; then when client
  4187. // does recv() it gets no data back.
  4188. do {
  4189. n = pull(NULL, conn, buf, sizeof(buf));
  4190. } while (n > 0);
  4191. #endif
  4192. // Now we know that our FIN is ACK-ed, safe to close
  4193. closesocket(conn->client.sock);
  4194. }
  4195. static void close_connection(struct mg_connection *conn) {
  4196. conn->must_close = 1;
  4197. if (conn->client.sock != INVALID_SOCKET) {
  4198. close_socket_gracefully(conn);
  4199. }
  4200. #ifndef NO_SSL
  4201. // Must be done AFTER socket is closed
  4202. if (conn->ssl != NULL) {
  4203. SSL_free(conn->ssl);
  4204. }
  4205. #endif
  4206. }
  4207. void mg_close_connection(struct mg_connection *conn) {
  4208. #ifndef NO_SSL
  4209. if (conn->client_ssl_ctx != NULL) {
  4210. SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
  4211. }
  4212. #endif
  4213. close_connection(conn);
  4214. free(conn);
  4215. }
  4216. struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
  4217. char *ebuf, size_t ebuf_len) {
  4218. static struct mg_context fake_ctx;
  4219. struct mg_connection *conn = NULL;
  4220. struct sockaddr_in sin;
  4221. struct hostent *he;
  4222. SOCKET sock;
  4223. if (host == NULL) {
  4224. snprintf(ebuf, ebuf_len, "%s", "NULL host");
  4225. } else if (use_ssl && SSLv23_client_method == NULL) {
  4226. snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
  4227. } else if ((he = gethostbyname(host)) == NULL) {
  4228. snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
  4229. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  4230. snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
  4231. } else {
  4232. sin.sin_family = AF_INET;
  4233. sin.sin_port = htons((uint16_t) port);
  4234. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  4235. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  4236. snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
  4237. host, port, strerror(ERRNO));
  4238. closesocket(sock);
  4239. } else if ((conn = (struct mg_connection *)
  4240. calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
  4241. snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
  4242. closesocket(sock);
  4243. #ifndef NO_SSL
  4244. } else if (use_ssl && (conn->client_ssl_ctx =
  4245. SSL_CTX_new(SSLv23_client_method())) == NULL) {
  4246. snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
  4247. closesocket(sock);
  4248. free(conn);
  4249. conn = NULL;
  4250. #endif // NO_SSL
  4251. } else {
  4252. conn->buf_size = MAX_REQUEST_SIZE;
  4253. conn->buf = (char *) (conn + 1);
  4254. conn->ctx = &fake_ctx;
  4255. conn->client.sock = sock;
  4256. conn->client.rsa.sin = sin;
  4257. conn->client.is_ssl = use_ssl;
  4258. #ifndef NO_SSL
  4259. if (use_ssl) {
  4260. // SSL_CTX_set_verify call is needed to switch off server certificate
  4261. // checking, which is off by default in OpenSSL and on in yaSSL.
  4262. SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
  4263. sslize(conn, conn->client_ssl_ctx, SSL_connect);
  4264. }
  4265. #endif
  4266. }
  4267. }
  4268. return conn;
  4269. }
  4270. static int is_valid_uri(const char *uri) {
  4271. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  4272. // URI can be an asterisk (*) or should start with slash.
  4273. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  4274. }
  4275. static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
  4276. const char *cl;
  4277. ebuf[0] = '\0';
  4278. reset_per_request_attributes(conn);
  4279. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  4280. &conn->data_len);
  4281. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  4282. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  4283. snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
  4284. } else if (conn->request_len <= 0) {
  4285. snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
  4286. } else if (parse_http_message(conn->buf, conn->buf_size,
  4287. &conn->request_info) <= 0) {
  4288. snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
  4289. } else {
  4290. // Request is valid
  4291. if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
  4292. conn->content_len = strtoll(cl, NULL, 10);
  4293. } else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
  4294. !mg_strcasecmp(conn->request_info.request_method, "PUT")) {
  4295. conn->content_len = -1;
  4296. } else {
  4297. conn->content_len = 0;
  4298. }
  4299. conn->birth_time = time(NULL);
  4300. }
  4301. return ebuf[0] == '\0';
  4302. }
  4303. struct mg_connection *mg_download(const char *host, int port, int use_ssl,
  4304. char *ebuf, size_t ebuf_len,
  4305. const char *fmt, ...) {
  4306. struct mg_connection *conn;
  4307. va_list ap;
  4308. va_start(ap, fmt);
  4309. ebuf[0] = '\0';
  4310. if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
  4311. } else if (mg_vprintf(conn, fmt, ap) <= 0) {
  4312. snprintf(ebuf, ebuf_len, "%s", "Error sending request");
  4313. } else {
  4314. getreq(conn, ebuf, ebuf_len);
  4315. }
  4316. if (ebuf[0] != '\0' && conn != NULL) {
  4317. mg_close_connection(conn);
  4318. conn = NULL;
  4319. }
  4320. return conn;
  4321. }
  4322. static void process_new_connection(struct mg_connection *conn) {
  4323. struct mg_request_info *ri = &conn->request_info;
  4324. int keep_alive_enabled, keep_alive, discard_len;
  4325. char ebuf[100];
  4326. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  4327. keep_alive = 0;
  4328. // Important: on new connection, reset the receiving buffer. Credit goes
  4329. // to crule42.
  4330. conn->data_len = 0;
  4331. do {
  4332. if (!getreq(conn, ebuf, sizeof(ebuf))) {
  4333. send_http_error(conn, 500, "Server Error", "%s", ebuf);
  4334. conn->must_close = 1;
  4335. } else if (!is_valid_uri(conn->request_info.uri)) {
  4336. snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
  4337. send_http_error(conn, 400, "Bad Request", "%s", ebuf);
  4338. } else if (strcmp(ri->http_version, "1.0") &&
  4339. strcmp(ri->http_version, "1.1")) {
  4340. snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
  4341. send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
  4342. }
  4343. if (ebuf[0] == '\0') {
  4344. handle_request(conn);
  4345. if (conn->ctx->callbacks.end_request != NULL) {
  4346. conn->ctx->callbacks.end_request(conn, conn->status_code);
  4347. }
  4348. log_access(conn);
  4349. }
  4350. if (ri->remote_user != NULL) {
  4351. free((void *) ri->remote_user);
  4352. ri->remote_user = NULL; // when having connections with and without auth would cause double free and then crash
  4353. }
  4354. // NOTE(lsm): order is important here. should_keep_alive() call
  4355. // is using parsed request, which will be invalid after memmove's below.
  4356. // Therefore, memorize should_keep_alive() result now for later use
  4357. // in loop exit condition.
  4358. keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
  4359. conn->content_len >= 0 && should_keep_alive(conn);
  4360. // Discard all buffered data for this request
  4361. discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
  4362. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  4363. (int) (conn->request_len + conn->content_len) : conn->data_len;
  4364. assert(discard_len >= 0);
  4365. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  4366. conn->data_len -= discard_len;
  4367. assert(conn->data_len >= 0);
  4368. assert(conn->data_len <= conn->buf_size);
  4369. } while (keep_alive);
  4370. }
  4371. // Worker threads take accepted socket from the queue
  4372. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  4373. (void) pthread_mutex_lock(&ctx->mutex);
  4374. DEBUG_TRACE(("going idle"));
  4375. // If the queue is empty, wait. We're idle at this point.
  4376. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  4377. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  4378. }
  4379. // If we're stopping, sq_head may be equal to sq_tail.
  4380. if (ctx->sq_head > ctx->sq_tail) {
  4381. // Copy socket from the queue and increment tail
  4382. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  4383. ctx->sq_tail++;
  4384. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  4385. // Wrap pointers if needed
  4386. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  4387. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  4388. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  4389. }
  4390. }
  4391. (void) pthread_cond_signal(&ctx->sq_empty);
  4392. (void) pthread_mutex_unlock(&ctx->mutex);
  4393. return !ctx->stop_flag;
  4394. }
  4395. static void *worker_thread(void *thread_func_param) {
  4396. struct mg_context *ctx = thread_func_param;
  4397. struct mg_connection *conn;
  4398. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  4399. if (conn == NULL) {
  4400. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  4401. } else {
  4402. conn->buf_size = MAX_REQUEST_SIZE;
  4403. conn->buf = (char *) (conn + 1);
  4404. conn->ctx = ctx;
  4405. conn->request_info.user_data = ctx->user_data;
  4406. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  4407. // sq_empty condvar to wake up the master waiting in produce_socket()
  4408. while (consume_socket(ctx, &conn->client)) {
  4409. conn->birth_time = time(NULL);
  4410. // Fill in IP, port info early so even if SSL setup below fails,
  4411. // error handler would have the corresponding info.
  4412. // Thanks to Johannes Winkelmann for the patch.
  4413. // TODO(lsm): Fix IPv6 case
  4414. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  4415. memcpy(&conn->request_info.remote_ip,
  4416. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  4417. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  4418. conn->request_info.is_ssl = conn->client.is_ssl;
  4419. if (!conn->client.is_ssl
  4420. #ifndef NO_SSL
  4421. || sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
  4422. #endif
  4423. ) {
  4424. process_new_connection(conn);
  4425. }
  4426. close_connection(conn);
  4427. }
  4428. free(conn);
  4429. }
  4430. // Signal master that we're done with connection and exiting
  4431. (void) pthread_mutex_lock(&ctx->mutex);
  4432. ctx->num_threads--;
  4433. (void) pthread_cond_signal(&ctx->cond);
  4434. assert(ctx->num_threads >= 0);
  4435. (void) pthread_mutex_unlock(&ctx->mutex);
  4436. DEBUG_TRACE(("exiting"));
  4437. return NULL;
  4438. }
  4439. // Master thread adds accepted socket to a queue
  4440. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  4441. (void) pthread_mutex_lock(&ctx->mutex);
  4442. // If the queue is full, wait
  4443. while (ctx->stop_flag == 0 &&
  4444. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  4445. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  4446. }
  4447. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  4448. // Copy socket to the queue and increment head
  4449. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  4450. ctx->sq_head++;
  4451. DEBUG_TRACE(("queued socket %d", sp->sock));
  4452. }
  4453. (void) pthread_cond_signal(&ctx->sq_full);
  4454. (void) pthread_mutex_unlock(&ctx->mutex);
  4455. }
  4456. static int set_sock_timeout(SOCKET sock, int milliseconds) {
  4457. #ifdef _WIN32
  4458. DWORD t = milliseconds;
  4459. #else
  4460. struct timeval t;
  4461. t.tv_sec = milliseconds / 1000;
  4462. t.tv_usec = (milliseconds * 1000) % 1000000;
  4463. #endif
  4464. return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
  4465. setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
  4466. }
  4467. static void accept_new_connection(const struct socket *listener,
  4468. struct mg_context *ctx) {
  4469. struct socket so;
  4470. char src_addr[20];
  4471. socklen_t len = sizeof(so.rsa);
  4472. int on = 1;
  4473. if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
  4474. } else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
  4475. sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
  4476. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  4477. closesocket(so.sock);
  4478. } else {
  4479. // Put so socket structure into the queue
  4480. DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
  4481. so.is_ssl = listener->is_ssl;
  4482. so.ssl_redir = listener->ssl_redir;
  4483. getsockname(so.sock, &so.lsa.sa, &len);
  4484. // Set TCP keep-alive. This is needed because if HTTP-level keep-alive
  4485. // is enabled, and client resets the connection, server won't get
  4486. // TCP FIN or RST and will keep the connection open forever. With TCP
  4487. // keep-alive, next keep-alive handshake will figure out that the client
  4488. // is down and will close the server end.
  4489. // Thanks to Igor Klopov who suggested the patch.
  4490. setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
  4491. set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
  4492. produce_socket(ctx, &so);
  4493. }
  4494. }
  4495. static void *master_thread(void *thread_func_param) {
  4496. struct mg_context *ctx = thread_func_param;
  4497. struct pollfd *pfd;
  4498. int i;
  4499. // Increase priority of the master thread
  4500. #if defined(_WIN32)
  4501. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  4502. #endif
  4503. #if defined(ISSUE_317)
  4504. struct sched_param sched_param;
  4505. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  4506. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  4507. #endif
  4508. pfd = calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
  4509. while (ctx->stop_flag == 0) {
  4510. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4511. pfd[i].fd = ctx->listening_sockets[i].sock;
  4512. pfd[i].events = POLLIN;
  4513. }
  4514. if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
  4515. for (i = 0; i < ctx->num_listening_sockets; i++) {
  4516. // NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
  4517. // successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
  4518. // Therefore, we're checking pfd[i].revents & POLLIN, not
  4519. // pfd[i].revents == POLLIN.
  4520. if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
  4521. accept_new_connection(&ctx->listening_sockets[i], ctx);
  4522. }
  4523. }
  4524. }
  4525. }
  4526. free(pfd);
  4527. DEBUG_TRACE(("stopping workers"));
  4528. // Stop signal received: somebody called mg_stop. Quit.
  4529. close_all_listening_sockets(ctx);
  4530. // Wakeup workers that are waiting for connections to handle.
  4531. pthread_cond_broadcast(&ctx->sq_full);
  4532. // Wait until all threads finish
  4533. (void) pthread_mutex_lock(&ctx->mutex);
  4534. while (ctx->num_threads > 0) {
  4535. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4536. }
  4537. (void) pthread_mutex_unlock(&ctx->mutex);
  4538. // All threads exited, no sync is needed. Destroy mutex and condvars
  4539. (void) pthread_mutex_destroy(&ctx->mutex);
  4540. (void) pthread_cond_destroy(&ctx->cond);
  4541. (void) pthread_cond_destroy(&ctx->sq_empty);
  4542. (void) pthread_cond_destroy(&ctx->sq_full);
  4543. #if !defined(NO_SSL)
  4544. uninitialize_ssl(ctx);
  4545. #endif
  4546. DEBUG_TRACE(("exiting"));
  4547. // Signal mg_stop() that we're done.
  4548. // WARNING: This must be the very last thing this
  4549. // thread does, as ctx becomes invalid after this line.
  4550. ctx->stop_flag = 2;
  4551. return NULL;
  4552. }
  4553. static void free_context(struct mg_context *ctx) {
  4554. int i;
  4555. // Deallocate config parameters
  4556. for (i = 0; i < NUM_OPTIONS; i++) {
  4557. if (ctx->config[i] != NULL)
  4558. free(ctx->config[i]);
  4559. }
  4560. #ifndef NO_SSL
  4561. // Deallocate SSL context
  4562. if (ctx->ssl_ctx != NULL) {
  4563. SSL_CTX_free(ctx->ssl_ctx);
  4564. }
  4565. if (ssl_mutexes != NULL) {
  4566. free(ssl_mutexes);
  4567. ssl_mutexes = NULL;
  4568. }
  4569. #endif // !NO_SSL
  4570. // Deallocate context itself
  4571. free(ctx);
  4572. }
  4573. void mg_stop(struct mg_context *ctx) {
  4574. ctx->stop_flag = 1;
  4575. // Wait until mg_fini() stops
  4576. while (ctx->stop_flag != 2) {
  4577. (void) mg_sleep(10);
  4578. }
  4579. free_context(ctx);
  4580. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4581. (void) WSACleanup();
  4582. #endif // _WIN32
  4583. }
  4584. struct mg_context *mg_start(const struct mg_callbacks *callbacks,
  4585. void *user_data,
  4586. const char **options) {
  4587. struct mg_context *ctx;
  4588. const char *name, *value, *default_value;
  4589. int i;
  4590. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4591. WSADATA data;
  4592. WSAStartup(MAKEWORD(2,2), &data);
  4593. InitializeCriticalSection(&global_log_file_lock);
  4594. #endif // _WIN32
  4595. // Allocate context and initialize reasonable general case defaults.
  4596. // TODO(lsm): do proper error handling here.
  4597. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4598. return NULL;
  4599. }
  4600. ctx->callbacks = *callbacks;
  4601. ctx->user_data = user_data;
  4602. while (options && (name = *options++) != NULL) {
  4603. if ((i = get_option_index(name)) == -1) {
  4604. cry(fc(ctx), "Invalid option: %s", name);
  4605. free_context(ctx);
  4606. return NULL;
  4607. } else if ((value = *options++) == NULL) {
  4608. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4609. free_context(ctx);
  4610. return NULL;
  4611. }
  4612. if (ctx->config[i] != NULL) {
  4613. cry(fc(ctx), "warning: %s: duplicate option", name);
  4614. free(ctx->config[i]);
  4615. }
  4616. ctx->config[i] = mg_strdup(value);
  4617. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4618. }
  4619. // Set default value if needed
  4620. for (i = 0; config_options[i * 2] != NULL; i++) {
  4621. default_value = config_options[i * 2 + 1];
  4622. if (ctx->config[i] == NULL && default_value != NULL) {
  4623. ctx->config[i] = mg_strdup(default_value);
  4624. }
  4625. }
  4626. // NOTE(lsm): order is important here. SSL certificates must
  4627. // be initialized before listening ports. UID must be set last.
  4628. if (!set_gpass_option(ctx) ||
  4629. #if !defined(NO_SSL)
  4630. !set_ssl_option(ctx) ||
  4631. #endif
  4632. !set_ports_option(ctx) ||
  4633. #if !defined(_WIN32)
  4634. !set_uid_option(ctx) ||
  4635. #endif
  4636. !set_acl_option(ctx)) {
  4637. free_context(ctx);
  4638. return NULL;
  4639. }
  4640. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4641. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4642. // won't kill the whole process.
  4643. (void) signal(SIGPIPE, SIG_IGN);
  4644. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4645. (void) signal(SIGCHLD, SIG_IGN);
  4646. #endif // !_WIN32
  4647. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4648. (void) pthread_cond_init(&ctx->cond, NULL);
  4649. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4650. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4651. // Start master (listening) thread
  4652. mg_start_thread(master_thread, ctx);
  4653. // Start worker threads
  4654. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4655. if (mg_start_thread(worker_thread, ctx) != 0) {
  4656. cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
  4657. } else {
  4658. ctx->num_threads++;
  4659. }
  4660. }
  4661. return ctx;
  4662. }