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