mongoose.c 164 KB

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  1. // Copyright (c) 2004-2012 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. #pragma warning (disable : 4127) // conditional expression is constant: introduced by FD_SET(..)
  32. #pragma warning (disable : 4204) // non-constant aggregate initializer: issued due to missing C99 support
  33. #endif
  34. // Disable WIN32_LEAN_AND_MEAN.
  35. // This makes windows.h always include winsock2.h
  36. #ifdef WIN32_LEAN_AND_MEAN
  37. #undef WIN32_LEAN_AND_MEAN
  38. #endif
  39. #if defined(__SYMBIAN32__)
  40. #define NO_SSL // SSL is not supported
  41. #define NO_CGI // CGI is not supported
  42. #define PATH_MAX FILENAME_MAX
  43. #endif // __SYMBIAN32__
  44. #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
  45. #include <sys/types.h>
  46. #include <sys/stat.h>
  47. #include <errno.h>
  48. #include <signal.h>
  49. #include <fcntl.h>
  50. #endif // !_WIN32_WCE
  51. #include <time.h>
  52. #include <stdlib.h>
  53. #include <stdarg.h>
  54. #include <assert.h>
  55. #include <string.h>
  56. #include <ctype.h>
  57. #include <limits.h>
  58. #include <stddef.h>
  59. #include <stdio.h>
  60. #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
  61. #define _WIN32_WINNT 0x0400 // To make it link in VS2005
  62. #include <windows.h>
  63. #ifndef PATH_MAX
  64. #define PATH_MAX MAX_PATH
  65. #endif
  66. #ifndef _WIN32_WCE
  67. #include <process.h>
  68. #include <direct.h>
  69. #include <io.h>
  70. #else // _WIN32_WCE
  71. #define NO_CGI // WinCE has no pipes
  72. typedef long off_t;
  73. #define errno GetLastError()
  74. #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
  75. #endif // _WIN32_WCE
  76. #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
  77. ((uint64_t)((uint32_t)(hi))) << 32))
  78. #define RATE_DIFF 10000000 // 100 nsecs
  79. #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
  80. #define SYS2UNIX_TIME(lo, hi) \
  81. (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
  82. // Visual Studio 6 does not know __func__ or __FUNCTION__
  83. // The rest of MS compilers use __FUNCTION__, not C99 __func__
  84. // Also use _strtoui64 on modern M$ compilers
  85. #if defined(_MSC_VER) && _MSC_VER < 1300
  86. #define STRX(x) #x
  87. #define STR(x) STRX(x)
  88. #define __func__ "line " STR(__LINE__)
  89. #define strtoull(x, y, z) strtoul(x, y, z)
  90. #define strtoll(x, y, z) strtol(x, y, z)
  91. #else
  92. #define __func__ __FUNCTION__
  93. #define strtoull(x, y, z) _strtoui64(x, y, z)
  94. #define strtoll(x, y, z) _strtoi64(x, y, z)
  95. #endif // _MSC_VER
  96. #define ERRNO GetLastError()
  97. #define NO_SOCKLEN_T
  98. #define SSL_LIB "ssleay32.dll"
  99. #define CRYPTO_LIB "libeay32.dll"
  100. #define O_NONBLOCK 0
  101. #if !defined(EWOULDBLOCK)
  102. #define EWOULDBLOCK WSAEWOULDBLOCK
  103. #endif // !EWOULDBLOCK
  104. #define _POSIX_
  105. #define INT64_FMT "I64d"
  106. #define WINCDECL __cdecl
  107. #define SHUT_WR 1
  108. #define snprintf _snprintf
  109. #define vsnprintf _vsnprintf
  110. #define mg_sleep(x) Sleep(x)
  111. #define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
  112. #define popen(x, y) _popen(x, y)
  113. #define pclose(x) _pclose(x)
  114. #define close(x) _close(x)
  115. #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
  116. #define RTLD_LAZY 0
  117. #define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
  118. #define fdopen(x, y) _fdopen((x), (y))
  119. #define write(x, y, z) _write((x), (y), (unsigned) z)
  120. #define read(x, y, z) _read((x), (y), (unsigned) z)
  121. #define flockfile(x) EnterCriticalSection(&global_log_file_lock)
  122. #define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
  123. #define sleep(x) Sleep((x) * 1000)
  124. #if !defined(fileno)
  125. #define fileno(x) _fileno(x)
  126. #endif // !fileno MINGW #defines fileno
  127. typedef HANDLE pthread_mutex_t;
  128. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  129. typedef DWORD pthread_t;
  130. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  131. static int pthread_mutex_lock(pthread_mutex_t *);
  132. static int pthread_mutex_unlock(pthread_mutex_t *);
  133. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
  134. struct file;
  135. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
  136. #if defined(HAVE_STDINT)
  137. #include <stdint.h>
  138. #else
  139. typedef unsigned int uint32_t;
  140. typedef unsigned short uint16_t;
  141. typedef unsigned __int64 uint64_t;
  142. typedef __int64 int64_t;
  143. #define INT64_MAX 9223372036854775807
  144. #endif // HAVE_STDINT
  145. // POSIX dirent interface
  146. struct dirent {
  147. char d_name[PATH_MAX];
  148. };
  149. typedef struct DIR {
  150. HANDLE handle;
  151. WIN32_FIND_DATAW info;
  152. struct dirent result;
  153. } DIR;
  154. // Mark required libraries
  155. #pragma comment(lib, "Ws2_32.lib")
  156. #else // UNIX specific
  157. #include <sys/wait.h>
  158. #include <sys/socket.h>
  159. #include <sys/select.h>
  160. #include <netinet/in.h>
  161. #include <arpa/inet.h>
  162. #include <sys/time.h>
  163. #include <stdint.h>
  164. #include <inttypes.h>
  165. #include <netdb.h>
  166. #include <pwd.h>
  167. #include <unistd.h>
  168. #include <dirent.h>
  169. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  170. #include <dlfcn.h>
  171. #endif
  172. #include <pthread.h>
  173. #if defined(__MACH__)
  174. #define SSL_LIB "libssl.dylib"
  175. #define CRYPTO_LIB "libcrypto.dylib"
  176. #else
  177. #if !defined(SSL_LIB)
  178. #define SSL_LIB "libssl.so"
  179. #endif
  180. #if !defined(CRYPTO_LIB)
  181. #define CRYPTO_LIB "libcrypto.so"
  182. #endif
  183. #endif
  184. #ifndef O_BINARY
  185. #define O_BINARY 0
  186. #endif // O_BINARY
  187. #define closesocket(a) close(a)
  188. #define mg_mkdir(x, y) mkdir(x, y)
  189. #define mg_remove(x) remove(x)
  190. #define mg_rename(x, y) rename(x, y)
  191. #define mg_sleep(x) usleep((x) * 1000)
  192. #define ERRNO errno
  193. #define INVALID_SOCKET (-1)
  194. #define INT64_FMT PRId64
  195. typedef int SOCKET;
  196. #define WINCDECL
  197. #endif // End of Windows and UNIX specific includes
  198. #include "mongoose.h"
  199. #ifdef USE_LUA
  200. #include <lua.h>
  201. #include <lauxlib.h>
  202. #endif
  203. #define MONGOOSE_VERSION "3.4"
  204. #define PASSWORDS_FILE_NAME ".htpasswd"
  205. #define CGI_ENVIRONMENT_SIZE 4096
  206. #define MAX_CGI_ENVIR_VARS 64
  207. #define MG_BUF_LEN 8192
  208. #define MAX_REQUEST_SIZE 16384
  209. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  210. #ifdef _WIN32
  211. static CRITICAL_SECTION global_log_file_lock;
  212. static pthread_t pthread_self(void) {
  213. return GetCurrentThreadId();
  214. }
  215. #endif // _WIN32
  216. #ifdef DEBUG_TRACE
  217. #undef DEBUG_TRACE
  218. #define DEBUG_TRACE(x)
  219. #else
  220. #if defined(DEBUG)
  221. #define DEBUG_TRACE(x) do { \
  222. flockfile(stdout); \
  223. printf("*** %lu.%p.%s.%d: ", \
  224. (unsigned long) time(NULL), (void *) pthread_self(), \
  225. __func__, __LINE__); \
  226. printf x; \
  227. putchar('\n'); \
  228. fflush(stdout); \
  229. funlockfile(stdout); \
  230. } while (0)
  231. #else
  232. #define DEBUG_TRACE(x)
  233. #endif // DEBUG
  234. #endif // DEBUG_TRACE
  235. // Darwin prior to 7.0 and Win32 do not have socklen_t
  236. #ifdef NO_SOCKLEN_T
  237. typedef int socklen_t;
  238. #endif // NO_SOCKLEN_T
  239. #define _DARWIN_UNLIMITED_SELECT
  240. #if !defined(MSG_NOSIGNAL)
  241. #define MSG_NOSIGNAL 0
  242. #endif
  243. #if !defined(SOMAXCONN)
  244. #define SOMAXCONN 100
  245. #endif
  246. #if !defined(PATH_MAX)
  247. #define PATH_MAX 4096
  248. #endif
  249. static const char *http_500_error = "Internal Server Error";
  250. // Snatched from OpenSSL includes. I put the prototypes here to be independent
  251. // from the OpenSSL source installation. Having this, mongoose + SSL can be
  252. // built on any system with binary SSL libraries installed.
  253. typedef struct ssl_st SSL;
  254. typedef struct ssl_method_st SSL_METHOD;
  255. typedef struct ssl_ctx_st SSL_CTX;
  256. #define SSL_ERROR_WANT_READ 2
  257. #define SSL_ERROR_WANT_WRITE 3
  258. #define SSL_FILETYPE_PEM 1
  259. #define CRYPTO_LOCK 1
  260. #if defined(NO_SSL_DL)
  261. extern void SSL_free(SSL *);
  262. extern int SSL_accept(SSL *);
  263. extern int SSL_connect(SSL *);
  264. extern int SSL_read(SSL *, void *, int);
  265. extern int SSL_write(SSL *, const void *, int);
  266. extern int SSL_get_error(const SSL *, int);
  267. extern int SSL_set_fd(SSL *, int);
  268. extern SSL *SSL_new(SSL_CTX *);
  269. extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
  270. extern SSL_METHOD *SSLv23_server_method(void);
  271. extern SSL_METHOD *SSLv23_client_method(void);
  272. extern int SSL_library_init(void);
  273. extern void SSL_load_error_strings(void);
  274. extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
  275. extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
  276. extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
  277. extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
  278. extern void SSL_CTX_free(SSL_CTX *);
  279. extern unsigned long ERR_get_error(void);
  280. extern char *ERR_error_string(unsigned long, char *);
  281. extern int CRYPTO_num_locks(void);
  282. extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
  283. extern void CRYPTO_set_id_callback(unsigned long (*)(void));
  284. #else
  285. // Dynamically loaded SSL functionality
  286. struct ssl_func {
  287. const char *name; // SSL function name
  288. void (*ptr)(void); // Function pointer
  289. };
  290. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  291. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  292. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  293. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  294. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  295. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  296. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  297. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  298. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  299. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  300. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  301. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  302. const char *, int)) ssl_sw[11].ptr)
  303. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  304. const char *, int)) ssl_sw[12].ptr)
  305. #define SSL_CTX_set_default_passwd_cb \
  306. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  307. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  308. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  309. #define SSL_CTX_use_certificate_chain_file \
  310. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  311. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  312. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  313. #define CRYPTO_set_locking_callback \
  314. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  315. #define CRYPTO_set_id_callback \
  316. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  317. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  318. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  319. // set_ssl_option() function updates this array.
  320. // It loads SSL library dynamically and changes NULLs to the actual addresses
  321. // of respective functions. The macros above (like SSL_connect()) are really
  322. // just calling these functions indirectly via the pointer.
  323. static struct ssl_func ssl_sw[] = {
  324. {"SSL_free", NULL},
  325. {"SSL_accept", NULL},
  326. {"SSL_connect", NULL},
  327. {"SSL_read", NULL},
  328. {"SSL_write", NULL},
  329. {"SSL_get_error", NULL},
  330. {"SSL_set_fd", NULL},
  331. {"SSL_new", NULL},
  332. {"SSL_CTX_new", NULL},
  333. {"SSLv23_server_method", NULL},
  334. {"SSL_library_init", NULL},
  335. {"SSL_CTX_use_PrivateKey_file", NULL},
  336. {"SSL_CTX_use_certificate_file",NULL},
  337. {"SSL_CTX_set_default_passwd_cb",NULL},
  338. {"SSL_CTX_free", NULL},
  339. {"SSL_load_error_strings", NULL},
  340. {"SSL_CTX_use_certificate_chain_file", NULL},
  341. {"SSLv23_client_method", NULL},
  342. {NULL, NULL}
  343. };
  344. // Similar array as ssl_sw. These functions could be located in different lib.
  345. #if !defined(NO_SSL)
  346. static struct ssl_func crypto_sw[] = {
  347. {"CRYPTO_num_locks", NULL},
  348. {"CRYPTO_set_locking_callback", NULL},
  349. {"CRYPTO_set_id_callback", NULL},
  350. {"ERR_get_error", NULL},
  351. {"ERR_error_string", NULL},
  352. {NULL, NULL}
  353. };
  354. #endif // NO_SSL
  355. #endif // NO_SSL_DL
  356. static const char *month_names[] = {
  357. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  358. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  359. };
  360. // Unified socket address. For IPv6 support, add IPv6 address structure
  361. // in the union u.
  362. union usa {
  363. struct sockaddr sa;
  364. struct sockaddr_in sin;
  365. #if defined(USE_IPV6)
  366. struct sockaddr_in6 sin6;
  367. #endif
  368. };
  369. // Describes a string (chunk of memory).
  370. struct vec {
  371. const char *ptr;
  372. size_t len;
  373. };
  374. struct file {
  375. int is_directory;
  376. time_t modification_time;
  377. int64_t size;
  378. FILE *fp;
  379. const char *membuf; // Non-NULL if file data is in memory
  380. };
  381. #define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL}
  382. // Describes listening socket, or socket which was accept()-ed by the master
  383. // thread and queued for future handling by the worker thread.
  384. struct socket {
  385. struct socket *next; // Linkage
  386. SOCKET sock; // Listening socket
  387. union usa lsa; // Local socket address
  388. union usa rsa; // Remote socket address
  389. int is_ssl; // Is socket SSL-ed
  390. };
  391. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  392. enum {
  393. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  394. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  395. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  396. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  397. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  398. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES,
  399. NUM_OPTIONS
  400. };
  401. static const char *config_options[] = {
  402. "C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  403. "E", "cgi_environment", NULL,
  404. "G", "put_delete_passwords_file", NULL,
  405. "I", "cgi_interpreter", NULL,
  406. "P", "protect_uri", NULL,
  407. "R", "authentication_domain", "mydomain.com",
  408. "S", "ssi_pattern", "**.shtml$|**.shtm$",
  409. "T", "throttle", NULL,
  410. "a", "access_log_file", NULL,
  411. "d", "enable_directory_listing", "yes",
  412. "e", "error_log_file", NULL,
  413. "g", "global_passwords_file", NULL,
  414. "i", "index_files", "index.html,index.htm,index.cgi,index.shtml,index.php",
  415. "k", "enable_keep_alive", "no",
  416. "l", "access_control_list", NULL,
  417. "m", "extra_mime_types", NULL,
  418. "p", "listening_ports", "8080",
  419. "r", "document_root", ".",
  420. "s", "ssl_certificate", NULL,
  421. "t", "num_threads", "20",
  422. "u", "run_as_user", NULL,
  423. "w", "url_rewrite_patterns", NULL,
  424. "x", "hide_files_patterns", NULL,
  425. NULL
  426. };
  427. #define ENTRIES_PER_CONFIG_OPTION 3
  428. struct mg_context {
  429. volatile int stop_flag; // Should we stop event loop
  430. SSL_CTX *ssl_ctx; // SSL context
  431. SSL_CTX *client_ssl_ctx; // Client SSL context
  432. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  433. mg_callback_t user_callback; // User-defined callback function
  434. void *user_data; // User-defined data
  435. struct socket *listening_sockets;
  436. volatile int num_threads; // Number of threads
  437. pthread_mutex_t mutex; // Protects (max|num)_threads
  438. pthread_cond_t cond; // Condvar for tracking workers terminations
  439. struct socket queue[20]; // Accepted sockets
  440. volatile int sq_head; // Head of the socket queue
  441. volatile int sq_tail; // Tail of the socket queue
  442. pthread_cond_t sq_full; // Signaled when socket is produced
  443. pthread_cond_t sq_empty; // Signaled when socket is consumed
  444. };
  445. struct mg_connection {
  446. struct mg_request_info request_info;
  447. struct mg_context *ctx;
  448. SSL *ssl; // SSL descriptor
  449. struct socket client; // Connected client
  450. time_t birth_time; // Time when request was received
  451. int64_t num_bytes_sent; // Total bytes sent to client
  452. int64_t content_len; // Content-Length header value
  453. int64_t consumed_content; // How many bytes of content have been read
  454. char *buf; // Buffer for received data
  455. char *path_info; // PATH_INFO part of the URL
  456. int must_close; // 1 if connection must be closed
  457. int buf_size; // Buffer size
  458. int request_len; // Size of the request + headers in a buffer
  459. int data_len; // Total size of data in a buffer
  460. int status_code; // HTTP reply status code, e.g. 200
  461. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  462. time_t last_throttle_time; // Last time throttled data was sent
  463. int64_t last_throttle_bytes;// Bytes sent this second
  464. };
  465. const char **mg_get_valid_option_names(void) {
  466. return config_options;
  467. }
  468. static void *call_user(struct mg_connection *conn, enum mg_event event) {
  469. if (conn != NULL && conn->ctx != NULL) {
  470. conn->request_info.user_data = conn->ctx->user_data;
  471. }
  472. return conn == NULL || conn->ctx == NULL || conn->ctx->user_callback == NULL ?
  473. NULL : conn->ctx->user_callback(event, conn);
  474. }
  475. static int is_file_in_memory(struct mg_connection *conn, const char *path,
  476. struct file *filep) {
  477. conn->request_info.ev_data = (void *) path;
  478. if ((filep->membuf = call_user(conn, MG_OPEN_FILE)) != NULL) {
  479. filep->size = (long) conn->request_info.ev_data;
  480. }
  481. return filep->membuf != NULL;
  482. }
  483. static int is_file_opened(const struct file *filep) {
  484. return filep->membuf != NULL || filep->fp != NULL;
  485. }
  486. static int mg_fopen(struct mg_connection *conn, const char *path,
  487. const char *mode, struct file *filep) {
  488. if (!is_file_in_memory(conn, path, filep)) {
  489. #ifdef _WIN32
  490. wchar_t wbuf[PATH_MAX], wmode[20];
  491. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  492. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  493. filep->fp = _wfopen(wbuf, wmode);
  494. #else
  495. filep->fp = fopen(path, mode);
  496. #endif
  497. }
  498. return is_file_opened(filep);
  499. }
  500. static void mg_fclose(struct file *filep) {
  501. if (filep != NULL && filep->fp != NULL) {
  502. fclose(filep->fp);
  503. }
  504. }
  505. static int get_option_index(const char *name) {
  506. int i;
  507. for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
  508. if (strcmp(config_options[i], name) == 0 ||
  509. strcmp(config_options[i + 1], name) == 0) {
  510. return i / ENTRIES_PER_CONFIG_OPTION;
  511. }
  512. }
  513. return -1;
  514. }
  515. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  516. int i;
  517. if ((i = get_option_index(name)) == -1) {
  518. return NULL;
  519. } else if (ctx->config[i] == NULL) {
  520. return "";
  521. } else {
  522. return ctx->config[i];
  523. }
  524. }
  525. static void sockaddr_to_string(char *buf, size_t len,
  526. const union usa *usa) {
  527. buf[0] = '\0';
  528. #if defined(USE_IPV6)
  529. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  530. (void *) &usa->sin.sin_addr :
  531. (void *) &usa->sin6.sin6_addr, buf, len);
  532. #elif defined(_WIN32)
  533. // Only Windoze Vista (and newer) have inet_ntop()
  534. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  535. #else
  536. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  537. #endif
  538. }
  539. static void cry(struct mg_connection *conn,
  540. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  541. // Print error message to the opened error log stream.
  542. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  543. char buf[MG_BUF_LEN], src_addr[20];
  544. va_list ap;
  545. FILE *fp;
  546. time_t timestamp;
  547. va_start(ap, fmt);
  548. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  549. va_end(ap);
  550. // Do not lock when getting the callback value, here and below.
  551. // I suppose this is fine, since function cannot disappear in the
  552. // same way string option can.
  553. conn->request_info.ev_data = buf;
  554. if (call_user(conn, MG_EVENT_LOG) == NULL) {
  555. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  556. fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  557. if (fp != NULL) {
  558. flockfile(fp);
  559. timestamp = time(NULL);
  560. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  561. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  562. src_addr);
  563. if (conn->request_info.request_method != NULL) {
  564. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  565. conn->request_info.uri);
  566. }
  567. fprintf(fp, "%s", buf);
  568. fputc('\n', fp);
  569. funlockfile(fp);
  570. fclose(fp);
  571. }
  572. }
  573. conn->request_info.ev_data = NULL;
  574. }
  575. // Return fake connection structure. Used for logging, if connection
  576. // is not applicable at the moment of logging.
  577. static struct mg_connection *fc(struct mg_context *ctx) {
  578. static struct mg_connection fake_connection;
  579. fake_connection.ctx = ctx;
  580. return &fake_connection;
  581. }
  582. const char *mg_version(void) {
  583. return MONGOOSE_VERSION;
  584. }
  585. struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
  586. return &conn->request_info;
  587. }
  588. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  589. for (; *src != '\0' && n > 1; n--) {
  590. *dst++ = *src++;
  591. }
  592. *dst = '\0';
  593. }
  594. static int lowercase(const char *s) {
  595. return tolower(* (const unsigned char *) s);
  596. }
  597. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  598. int diff = 0;
  599. if (len > 0)
  600. do {
  601. diff = lowercase(s1++) - lowercase(s2++);
  602. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  603. return diff;
  604. }
  605. static int mg_strcasecmp(const char *s1, const char *s2) {
  606. int diff;
  607. do {
  608. diff = lowercase(s1++) - lowercase(s2++);
  609. } while (diff == 0 && s1[-1] != '\0');
  610. return diff;
  611. }
  612. static char * mg_strndup(const char *ptr, size_t len) {
  613. char *p;
  614. if ((p = (char *) malloc(len + 1)) != NULL) {
  615. mg_strlcpy(p, ptr, len + 1);
  616. }
  617. return p;
  618. }
  619. static char * mg_strdup(const char *str) {
  620. return mg_strndup(str, strlen(str));
  621. }
  622. // Like snprintf(), but never returns negative value, or a value
  623. // that is larger than a supplied buffer.
  624. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  625. // in his audit report.
  626. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  627. const char *fmt, va_list ap) {
  628. int n;
  629. if (buflen == 0)
  630. return 0;
  631. n = vsnprintf(buf, buflen, fmt, ap);
  632. if (n < 0) {
  633. cry(conn, "vsnprintf error");
  634. n = 0;
  635. } else if (n >= (int) buflen) {
  636. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  637. n > 200 ? 200 : n, buf);
  638. n = (int) buflen - 1;
  639. }
  640. buf[n] = '\0';
  641. return n;
  642. }
  643. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  644. PRINTF_FORMAT_STRING(const char *fmt), ...)
  645. PRINTF_ARGS(4, 5);
  646. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  647. const char *fmt, ...) {
  648. va_list ap;
  649. int n;
  650. va_start(ap, fmt);
  651. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  652. va_end(ap);
  653. return n;
  654. }
  655. // Skip the characters until one of the delimiters characters found.
  656. // 0-terminate resulting word. Skip the delimiter and following whitespaces.
  657. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  658. // Delimiters can be quoted with quotechar.
  659. static char *skip_quoted(char **buf, const char *delimiters,
  660. const char *whitespace, char quotechar) {
  661. char *p, *begin_word, *end_word, *end_whitespace;
  662. begin_word = *buf;
  663. end_word = begin_word + strcspn(begin_word, delimiters);
  664. // Check for quotechar
  665. if (end_word > begin_word) {
  666. p = end_word - 1;
  667. while (*p == quotechar) {
  668. // If there is anything beyond end_word, copy it
  669. if (*end_word == '\0') {
  670. *p = '\0';
  671. break;
  672. } else {
  673. size_t end_off = strcspn(end_word + 1, delimiters);
  674. memmove (p, end_word, end_off + 1);
  675. p += end_off; // p must correspond to end_word - 1
  676. end_word += end_off + 1;
  677. }
  678. }
  679. for (p++; p < end_word; p++) {
  680. *p = '\0';
  681. }
  682. }
  683. if (*end_word == '\0') {
  684. *buf = end_word;
  685. } else {
  686. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  687. for (p = end_word; p < end_whitespace; p++) {
  688. *p = '\0';
  689. }
  690. *buf = end_whitespace;
  691. }
  692. return begin_word;
  693. }
  694. // Simplified version of skip_quoted without quote char
  695. // and whitespace == delimiters
  696. static char *skip(char **buf, const char *delimiters) {
  697. return skip_quoted(buf, delimiters, delimiters, 0);
  698. }
  699. // Return HTTP header value, or NULL if not found.
  700. static const char *get_header(const struct mg_request_info *ri,
  701. const char *name) {
  702. int i;
  703. for (i = 0; i < ri->num_headers; i++)
  704. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  705. return ri->http_headers[i].value;
  706. return NULL;
  707. }
  708. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  709. return get_header(&conn->request_info, name);
  710. }
  711. // A helper function for traversing a comma separated list of values.
  712. // It returns a list pointer shifted to the next value, or NULL if the end
  713. // of the list found.
  714. // Value is stored in val vector. If value has form "x=y", then eq_val
  715. // vector is initialized to point to the "y" part, and val vector length
  716. // is adjusted to point only to "x".
  717. static const char *next_option(const char *list, struct vec *val,
  718. struct vec *eq_val) {
  719. if (list == NULL || *list == '\0') {
  720. // End of the list
  721. list = NULL;
  722. } else {
  723. val->ptr = list;
  724. if ((list = strchr(val->ptr, ',')) != NULL) {
  725. // Comma found. Store length and shift the list ptr
  726. val->len = list - val->ptr;
  727. list++;
  728. } else {
  729. // This value is the last one
  730. list = val->ptr + strlen(val->ptr);
  731. val->len = list - val->ptr;
  732. }
  733. if (eq_val != NULL) {
  734. // Value has form "x=y", adjust pointers and lengths
  735. // so that val points to "x", and eq_val points to "y".
  736. eq_val->len = 0;
  737. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  738. if (eq_val->ptr != NULL) {
  739. eq_val->ptr++; // Skip over '=' character
  740. eq_val->len = val->ptr + val->len - eq_val->ptr;
  741. val->len = (eq_val->ptr - val->ptr) - 1;
  742. }
  743. }
  744. }
  745. return list;
  746. }
  747. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  748. const char *or_str;
  749. int i, j, len, res;
  750. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  751. res = match_prefix(pattern, or_str - pattern, str);
  752. return res > 0 ? res :
  753. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  754. }
  755. i = j = 0;
  756. res = -1;
  757. for (; i < pattern_len; i++, j++) {
  758. if (pattern[i] == '?' && str[j] != '\0') {
  759. continue;
  760. } else if (pattern[i] == '$') {
  761. return str[j] == '\0' ? j : -1;
  762. } else if (pattern[i] == '*') {
  763. i++;
  764. if (pattern[i] == '*') {
  765. i++;
  766. len = (int) strlen(str + j);
  767. } else {
  768. len = (int) strcspn(str + j, "/");
  769. }
  770. if (i == pattern_len) {
  771. return j + len;
  772. }
  773. do {
  774. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  775. } while (res == -1 && len-- > 0);
  776. return res == -1 ? -1 : j + res + len;
  777. } else if (pattern[i] != str[j]) {
  778. return -1;
  779. }
  780. }
  781. return j;
  782. }
  783. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  784. // This function must tolerate situations when connection info is not
  785. // set up, for example if request parsing failed.
  786. static int should_keep_alive(const struct mg_connection *conn) {
  787. const char *http_version = conn->request_info.http_version;
  788. const char *header = mg_get_header(conn, "Connection");
  789. if (conn->must_close ||
  790. conn->status_code == 401 ||
  791. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  792. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  793. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  794. return 0;
  795. }
  796. return 1;
  797. }
  798. static const char *suggest_connection_header(const struct mg_connection *conn) {
  799. return should_keep_alive(conn) ? "keep-alive" : "close";
  800. }
  801. static void send_http_error(struct mg_connection *, int, const char *,
  802. PRINTF_FORMAT_STRING(const char *fmt), ...)
  803. PRINTF_ARGS(4, 5);
  804. static void send_http_error(struct mg_connection *conn, int status,
  805. const char *reason, const char *fmt, ...) {
  806. char buf[MG_BUF_LEN];
  807. va_list ap;
  808. int len;
  809. conn->status_code = status;
  810. conn->request_info.ev_data = (void *) (long) status;
  811. if (call_user(conn, MG_HTTP_ERROR) == NULL) {
  812. buf[0] = '\0';
  813. len = 0;
  814. // Errors 1xx, 204 and 304 MUST NOT send a body
  815. if (status > 199 && status != 204 && status != 304) {
  816. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  817. buf[len++] = '\n';
  818. va_start(ap, fmt);
  819. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  820. va_end(ap);
  821. }
  822. DEBUG_TRACE(("[%s]", buf));
  823. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  824. "Content-Length: %d\r\n"
  825. "Connection: %s\r\n\r\n", status, reason, len,
  826. suggest_connection_header(conn));
  827. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  828. }
  829. }
  830. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  831. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  832. unused = NULL;
  833. *mutex = CreateMutex(NULL, FALSE, NULL);
  834. return *mutex == NULL ? -1 : 0;
  835. }
  836. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  837. return CloseHandle(*mutex) == 0 ? -1 : 0;
  838. }
  839. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  840. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  841. }
  842. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  843. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  844. }
  845. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  846. unused = NULL;
  847. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  848. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  849. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  850. }
  851. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  852. HANDLE handles[] = {cv->signal, cv->broadcast};
  853. ReleaseMutex(*mutex);
  854. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  855. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  856. }
  857. static int pthread_cond_signal(pthread_cond_t *cv) {
  858. return SetEvent(cv->signal) == 0 ? -1 : 0;
  859. }
  860. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  861. // Implementation with PulseEvent() has race condition, see
  862. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  863. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  864. }
  865. static int pthread_cond_destroy(pthread_cond_t *cv) {
  866. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  867. }
  868. // For Windows, change all slashes to backslashes in path names.
  869. static void change_slashes_to_backslashes(char *path) {
  870. int i;
  871. for (i = 0; path[i] != '\0'; i++) {
  872. if (path[i] == '/')
  873. path[i] = '\\';
  874. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  875. if (path[i] == '\\' && i > 0)
  876. while (path[i + 1] == '\\' || path[i + 1] == '/')
  877. (void) memmove(path + i + 1,
  878. path + i + 2, strlen(path + i + 1));
  879. }
  880. }
  881. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  882. // wbuf and wbuf_len is a target buffer and its length.
  883. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  884. char buf[PATH_MAX], buf2[PATH_MAX], *p;
  885. mg_strlcpy(buf, path, sizeof(buf));
  886. change_slashes_to_backslashes(buf);
  887. // Point p to the end of the file name
  888. p = buf + strlen(buf) - 1;
  889. // Trim trailing backslash character
  890. while (p > buf && *p == '\\' && p[-1] != ':') {
  891. *p-- = '\0';
  892. }
  893. // Protect from CGI code disclosure.
  894. // This is very nasty hole. Windows happily opens files with
  895. // some garbage in the end of file name. So fopen("a.cgi ", "r")
  896. // actually opens "a.cgi", and does not return an error!
  897. if (*p == 0x20 || // No space at the end
  898. (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path
  899. *p == 0x2b || // No '+'
  900. (*p & ~0x7f)) { // And generally no non-ASCII chars
  901. (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
  902. wbuf[0] = L'\0';
  903. } else {
  904. // Convert to Unicode and back. If doubly-converted string does not
  905. // match the original, something is fishy, reject.
  906. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  907. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  908. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  909. NULL, NULL);
  910. if (strcmp(buf, buf2) != 0) {
  911. wbuf[0] = L'\0';
  912. }
  913. }
  914. }
  915. #if defined(_WIN32_WCE)
  916. static time_t time(time_t *ptime) {
  917. time_t t;
  918. SYSTEMTIME st;
  919. FILETIME ft;
  920. GetSystemTime(&st);
  921. SystemTimeToFileTime(&st, &ft);
  922. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  923. if (ptime != NULL) {
  924. *ptime = t;
  925. }
  926. return t;
  927. }
  928. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  929. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  930. FILETIME ft, lft;
  931. SYSTEMTIME st;
  932. TIME_ZONE_INFORMATION tzinfo;
  933. if (ptm == NULL) {
  934. return NULL;
  935. }
  936. * (int64_t *) &ft = t;
  937. FileTimeToLocalFileTime(&ft, &lft);
  938. FileTimeToSystemTime(&lft, &st);
  939. ptm->tm_year = st.wYear - 1900;
  940. ptm->tm_mon = st.wMonth - 1;
  941. ptm->tm_wday = st.wDayOfWeek;
  942. ptm->tm_mday = st.wDay;
  943. ptm->tm_hour = st.wHour;
  944. ptm->tm_min = st.wMinute;
  945. ptm->tm_sec = st.wSecond;
  946. ptm->tm_yday = 0; // hope nobody uses this
  947. ptm->tm_isdst =
  948. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  949. return ptm;
  950. }
  951. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  952. // FIXME(lsm): fix this.
  953. return localtime(ptime, ptm);
  954. }
  955. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  956. const struct tm *tm) {
  957. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  958. return 0;
  959. }
  960. #endif
  961. static int mg_rename(const char* oldname, const char* newname) {
  962. wchar_t woldbuf[PATH_MAX];
  963. wchar_t wnewbuf[PATH_MAX];
  964. to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
  965. to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
  966. return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
  967. }
  968. static int mg_stat(struct mg_connection *conn, const char *path,
  969. struct file *filep) {
  970. wchar_t wbuf[PATH_MAX];
  971. WIN32_FILE_ATTRIBUTE_DATA info;
  972. if (!is_file_in_memory(conn, path, filep)) {
  973. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  974. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  975. filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  976. filep->modification_time = SYS2UNIX_TIME(
  977. info.ftLastWriteTime.dwLowDateTime,
  978. info.ftLastWriteTime.dwHighDateTime);
  979. filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  980. }
  981. }
  982. return filep->membuf != NULL || filep->modification_time != 0;
  983. }
  984. static int mg_remove(const char *path) {
  985. wchar_t wbuf[PATH_MAX];
  986. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  987. return DeleteFileW(wbuf) ? 0 : -1;
  988. }
  989. static int mg_mkdir(const char *path, int mode) {
  990. char buf[PATH_MAX];
  991. wchar_t wbuf[PATH_MAX];
  992. mode = 0; // Unused
  993. mg_strlcpy(buf, path, sizeof(buf));
  994. change_slashes_to_backslashes(buf);
  995. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
  996. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  997. }
  998. // Implementation of POSIX opendir/closedir/readdir for Windows.
  999. static DIR * opendir(const char *name) {
  1000. DIR *dir = NULL;
  1001. wchar_t wpath[PATH_MAX];
  1002. DWORD attrs;
  1003. if (name == NULL) {
  1004. SetLastError(ERROR_BAD_ARGUMENTS);
  1005. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  1006. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  1007. } else {
  1008. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  1009. attrs = GetFileAttributesW(wpath);
  1010. if (attrs != 0xFFFFFFFF &&
  1011. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  1012. (void) wcscat(wpath, L"\\*");
  1013. dir->handle = FindFirstFileW(wpath, &dir->info);
  1014. dir->result.d_name[0] = '\0';
  1015. } else {
  1016. free(dir);
  1017. dir = NULL;
  1018. }
  1019. }
  1020. return dir;
  1021. }
  1022. static int closedir(DIR *dir) {
  1023. int result = 0;
  1024. if (dir != NULL) {
  1025. if (dir->handle != INVALID_HANDLE_VALUE)
  1026. result = FindClose(dir->handle) ? 0 : -1;
  1027. free(dir);
  1028. } else {
  1029. result = -1;
  1030. SetLastError(ERROR_BAD_ARGUMENTS);
  1031. }
  1032. return result;
  1033. }
  1034. static struct dirent *readdir(DIR *dir) {
  1035. struct dirent *result = 0;
  1036. if (dir) {
  1037. if (dir->handle != INVALID_HANDLE_VALUE) {
  1038. result = &dir->result;
  1039. (void) WideCharToMultiByte(CP_UTF8, 0,
  1040. dir->info.cFileName, -1, result->d_name,
  1041. sizeof(result->d_name), NULL, NULL);
  1042. if (!FindNextFileW(dir->handle, &dir->info)) {
  1043. (void) FindClose(dir->handle);
  1044. dir->handle = INVALID_HANDLE_VALUE;
  1045. }
  1046. } else {
  1047. SetLastError(ERROR_FILE_NOT_FOUND);
  1048. }
  1049. } else {
  1050. SetLastError(ERROR_BAD_ARGUMENTS);
  1051. }
  1052. return result;
  1053. }
  1054. #define set_close_on_exec(x) // No FD_CLOEXEC on Windows
  1055. int mg_start_thread(mg_thread_func_t f, void *p) {
  1056. return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1057. }
  1058. static HANDLE dlopen(const char *dll_name, int flags) {
  1059. wchar_t wbuf[PATH_MAX];
  1060. flags = 0; // Unused
  1061. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1062. return LoadLibraryW(wbuf);
  1063. }
  1064. #if !defined(NO_CGI)
  1065. #define SIGKILL 0
  1066. static int kill(pid_t pid, int sig_num) {
  1067. (void) TerminateProcess(pid, sig_num);
  1068. (void) CloseHandle(pid);
  1069. return 0;
  1070. }
  1071. static void trim_trailing_whitespaces(char *s) {
  1072. char *e = s + strlen(s) - 1;
  1073. while (e > s && isspace(* (unsigned char *) e)) {
  1074. *e-- = '\0';
  1075. }
  1076. }
  1077. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1078. char *envblk, char *envp[], int fd_stdin,
  1079. int fd_stdout, const char *dir) {
  1080. HANDLE me;
  1081. char *p, *interp, full_interp[PATH_MAX], cmdline[PATH_MAX], buf[PATH_MAX];
  1082. struct file file;
  1083. STARTUPINFOA si = { sizeof(si) };
  1084. PROCESS_INFORMATION pi = { 0 };
  1085. envp = NULL; // Unused
  1086. // TODO(lsm): redirect CGI errors to the error log file
  1087. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1088. si.wShowWindow = SW_HIDE;
  1089. me = GetCurrentProcess();
  1090. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  1091. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1092. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  1093. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1094. // If CGI file is a script, try to read the interpreter line
  1095. interp = conn->ctx->config[CGI_INTERPRETER];
  1096. if (interp == NULL) {
  1097. buf[0] = buf[1] = '\0';
  1098. // Read the first line of the script into the buffer
  1099. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1100. if (mg_fopen(conn, cmdline, "r", &file)) {
  1101. p = (char *) file.membuf;
  1102. mg_fgets(buf, sizeof(buf), &file, &p);
  1103. mg_fclose(&file);
  1104. buf[sizeof(buf) - 1] = '\0';
  1105. }
  1106. if (buf[0] == '#' && buf[1] == '!') {
  1107. trim_trailing_whitespaces(buf + 2);
  1108. } else {
  1109. buf[2] = '\0';
  1110. }
  1111. interp = buf + 2;
  1112. }
  1113. if (interp[0] != '\0') {
  1114. GetFullPathName(interp, sizeof(full_interp), full_interp, NULL);
  1115. interp = full_interp;
  1116. }
  1117. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s",
  1118. interp, interp[0] == '\0' ? "" : " ", prog);
  1119. DEBUG_TRACE(("Running [%s]", cmdline));
  1120. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1121. CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
  1122. cry(conn, "%s: CreateProcess(%s): %d",
  1123. __func__, cmdline, ERRNO);
  1124. pi.hProcess = (pid_t) -1;
  1125. }
  1126. // Always close these to prevent handle leakage.
  1127. (void) close(fd_stdin);
  1128. (void) close(fd_stdout);
  1129. (void) CloseHandle(si.hStdOutput);
  1130. (void) CloseHandle(si.hStdInput);
  1131. (void) CloseHandle(pi.hThread);
  1132. return (pid_t) pi.hProcess;
  1133. }
  1134. #endif // !NO_CGI
  1135. static int set_non_blocking_mode(SOCKET sock) {
  1136. unsigned long on = 1;
  1137. return ioctlsocket(sock, FIONBIO, &on);
  1138. }
  1139. #else
  1140. static int mg_stat(struct mg_connection *conn, const char *path,
  1141. struct file *filep) {
  1142. struct stat st;
  1143. if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
  1144. filep->size = st.st_size;
  1145. filep->modification_time = st.st_mtime;
  1146. filep->is_directory = S_ISDIR(st.st_mode);
  1147. } else {
  1148. filep->modification_time = (time_t) 0;
  1149. }
  1150. return filep->membuf != NULL || filep->modification_time != (time_t) 0;
  1151. }
  1152. static void set_close_on_exec(int fd) {
  1153. fcntl(fd, F_SETFD, FD_CLOEXEC);
  1154. }
  1155. int mg_start_thread(mg_thread_func_t func, void *param) {
  1156. pthread_t thread_id;
  1157. pthread_attr_t attr;
  1158. (void) pthread_attr_init(&attr);
  1159. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1160. // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
  1161. // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
  1162. return pthread_create(&thread_id, &attr, func, param);
  1163. }
  1164. #ifndef NO_CGI
  1165. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1166. char *envblk, char *envp[], int fd_stdin,
  1167. int fd_stdout, const char *dir) {
  1168. pid_t pid;
  1169. const char *interp;
  1170. envblk = NULL; // Unused
  1171. if ((pid = fork()) == -1) {
  1172. // Parent
  1173. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1174. } else if (pid == 0) {
  1175. // Child
  1176. if (chdir(dir) != 0) {
  1177. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1178. } else if (dup2(fd_stdin, 0) == -1) {
  1179. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1180. } else if (dup2(fd_stdout, 1) == -1) {
  1181. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1182. } else {
  1183. (void) dup2(fd_stdout, 2);
  1184. (void) close(fd_stdin);
  1185. (void) close(fd_stdout);
  1186. interp = conn->ctx->config[CGI_INTERPRETER];
  1187. if (interp == NULL) {
  1188. (void) execle(prog, prog, NULL, envp);
  1189. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1190. } else {
  1191. (void) execle(interp, interp, prog, NULL, envp);
  1192. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1193. strerror(ERRNO));
  1194. }
  1195. }
  1196. exit(EXIT_FAILURE);
  1197. }
  1198. // Parent. Close stdio descriptors
  1199. (void) close(fd_stdin);
  1200. (void) close(fd_stdout);
  1201. return pid;
  1202. }
  1203. #endif // !NO_CGI
  1204. static int set_non_blocking_mode(SOCKET sock) {
  1205. int flags;
  1206. flags = fcntl(sock, F_GETFL, 0);
  1207. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1208. return 0;
  1209. }
  1210. #endif // _WIN32
  1211. // Write data to the IO channel - opened file descriptor, socket or SSL
  1212. // descriptor. Return number of bytes written.
  1213. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1214. int64_t len) {
  1215. int64_t sent;
  1216. int n, k;
  1217. sent = 0;
  1218. while (sent < len) {
  1219. // How many bytes we send in this iteration
  1220. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1221. if (ssl != NULL) {
  1222. n = SSL_write(ssl, buf + sent, k);
  1223. } else if (fp != NULL) {
  1224. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1225. if (ferror(fp))
  1226. n = -1;
  1227. } else {
  1228. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1229. }
  1230. if (n < 0)
  1231. break;
  1232. sent += n;
  1233. }
  1234. return sent;
  1235. }
  1236. // This function is needed to prevent Mongoose to be stuck in a blocking
  1237. // socket read when user requested exit. To do that, we sleep in select
  1238. // with a timeout, and when returned, check the context for the stop flag.
  1239. // If it is set, we return 0, and this means that we must not continue
  1240. // reading, must give up and close the connection and exit serving thread.
  1241. static int wait_until_socket_is_readable(struct mg_connection *conn) {
  1242. int result;
  1243. struct timeval tv;
  1244. fd_set set;
  1245. do {
  1246. tv.tv_sec = 0;
  1247. tv.tv_usec = 300 * 1000;
  1248. FD_ZERO(&set);
  1249. FD_SET(conn->client.sock, &set);
  1250. result = select(conn->client.sock + 1, &set, NULL, NULL, &tv);
  1251. } while ((result == 0 || (result < 0 && ERRNO == EINTR)) &&
  1252. conn->ctx->stop_flag == 0);
  1253. return conn->ctx->stop_flag || result < 0 ? 0 : 1;
  1254. }
  1255. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1256. // Return negative value on error, or number of bytes read on success.
  1257. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1258. int nread;
  1259. if (fp != NULL) {
  1260. // Use read() instead of fread(), because if we're reading from the CGI
  1261. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1262. // to block and must pass all read bytes immediately to the client.
  1263. nread = read(fileno(fp), buf, (size_t) len);
  1264. } else if (!conn->must_close && !wait_until_socket_is_readable(conn)) {
  1265. nread = -1;
  1266. } else if (conn->ssl != NULL) {
  1267. nread = SSL_read(conn->ssl, buf, len);
  1268. } else {
  1269. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1270. }
  1271. return conn->ctx->stop_flag ? -1 : nread;
  1272. }
  1273. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1274. int n, buffered_len, nread;
  1275. const char *body;
  1276. nread = 0;
  1277. if (conn->consumed_content < conn->content_len) {
  1278. // Adjust number of bytes to read.
  1279. int64_t to_read = conn->content_len - conn->consumed_content;
  1280. if (to_read < (int64_t) len) {
  1281. len = (size_t) to_read;
  1282. }
  1283. // Return buffered data
  1284. body = conn->buf + conn->request_len + conn->consumed_content;
  1285. buffered_len = &conn->buf[conn->data_len] - body;
  1286. if (buffered_len > 0) {
  1287. if (len < (size_t) buffered_len) {
  1288. buffered_len = (int) len;
  1289. }
  1290. memcpy(buf, body, (size_t) buffered_len);
  1291. len -= buffered_len;
  1292. conn->consumed_content += buffered_len;
  1293. nread += buffered_len;
  1294. buf = (char *) buf + buffered_len;
  1295. }
  1296. // We have returned all buffered data. Read new data from the remote socket.
  1297. while (len > 0) {
  1298. n = pull(NULL, conn, (char *) buf, (int) len);
  1299. if (n < 0) {
  1300. nread = n; // Propagate the error
  1301. break;
  1302. } else if (n == 0) {
  1303. break; // No more data to read
  1304. } else {
  1305. buf = (char *) buf + n;
  1306. conn->consumed_content += n;
  1307. nread += n;
  1308. len -= n;
  1309. }
  1310. }
  1311. }
  1312. return nread;
  1313. }
  1314. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1315. time_t now;
  1316. int64_t n, total, allowed;
  1317. if (conn->throttle > 0) {
  1318. if ((now = time(NULL)) != conn->last_throttle_time) {
  1319. conn->last_throttle_time = now;
  1320. conn->last_throttle_bytes = 0;
  1321. }
  1322. allowed = conn->throttle - conn->last_throttle_bytes;
  1323. if (allowed > (int64_t) len) {
  1324. allowed = len;
  1325. }
  1326. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1327. (int64_t) allowed)) == allowed) {
  1328. buf = (char *) buf + total;
  1329. conn->last_throttle_bytes += total;
  1330. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1331. allowed = conn->throttle > (int64_t) len - total ?
  1332. (int64_t) len - total : conn->throttle;
  1333. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1334. (int64_t) allowed)) != allowed) {
  1335. break;
  1336. }
  1337. sleep(1);
  1338. conn->last_throttle_bytes = allowed;
  1339. conn->last_throttle_time = time(NULL);
  1340. buf = (char *) buf + n;
  1341. total += n;
  1342. }
  1343. }
  1344. } else {
  1345. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1346. (int64_t) len);
  1347. }
  1348. return (int) total;
  1349. }
  1350. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1351. char mem[MG_BUF_LEN], *buf = mem;
  1352. int len;
  1353. va_list ap;
  1354. // Print in a local buffer first, hoping that it is large enough to
  1355. // hold the whole message
  1356. va_start(ap, fmt);
  1357. len = vsnprintf(mem, sizeof(mem), fmt, ap);
  1358. va_end(ap);
  1359. if (len == 0) {
  1360. // Do nothing. mg_printf(conn, "%s", "") was called.
  1361. } else if (len < 0) {
  1362. // vsnprintf() error, give up
  1363. len = -1;
  1364. cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt);
  1365. } else if (len > (int) sizeof(mem) && (buf = (char *) malloc(len + 1)) != NULL) {
  1366. // Local buffer is not large enough, allocate big buffer on heap
  1367. va_start(ap, fmt);
  1368. vsnprintf(buf, len + 1, fmt, ap);
  1369. va_end(ap);
  1370. len = mg_write(conn, buf, (size_t) len);
  1371. free(buf);
  1372. } else if (len > (int) sizeof(mem)) {
  1373. // Failed to allocate large enough buffer, give up
  1374. cry(conn, "%s(%s, ...): Can't allocate %d bytes, not printing anything",
  1375. __func__, fmt, len);
  1376. len = -1;
  1377. } else {
  1378. // Copy to the local buffer succeeded
  1379. len = mg_write(conn, buf, (size_t) len);
  1380. }
  1381. return len;
  1382. }
  1383. // URL-decode input buffer into destination buffer.
  1384. // 0-terminate the destination buffer. Return the length of decoded data.
  1385. // form-url-encoded data differs from URI encoding in a way that it
  1386. // uses '+' as character for space, see RFC 1866 section 8.2.1
  1387. // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
  1388. static int url_decode(const char *src, int src_len, char *dst,
  1389. int dst_len, int is_form_url_encoded) {
  1390. int i, j, a, b;
  1391. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1392. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1393. if (src[i] == '%' &&
  1394. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1395. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1396. a = tolower(* (const unsigned char *) (src + i + 1));
  1397. b = tolower(* (const unsigned char *) (src + i + 2));
  1398. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1399. i += 2;
  1400. } else if (is_form_url_encoded && src[i] == '+') {
  1401. dst[j] = ' ';
  1402. } else {
  1403. dst[j] = src[i];
  1404. }
  1405. }
  1406. dst[j] = '\0'; // Null-terminate the destination
  1407. return i >= src_len ? j : -1;
  1408. }
  1409. // Scan given buffer and fetch the value of the given variable.
  1410. // It can be specified in query string, or in the POST data.
  1411. // Return -1 if the variable not found, or length of the URL-decoded value
  1412. // stored in dst. The dst buffer is guaranteed to be NUL-terminated if it
  1413. // is not NULL or zero-length. If dst is NULL or zero-length, then
  1414. // -2 is returned.
  1415. int mg_get_var(const char *buf, size_t buf_len, const char *name,
  1416. char *dst, size_t dst_len) {
  1417. const char *p, *e, *s;
  1418. size_t name_len;
  1419. int len;
  1420. if (dst == NULL || dst_len == 0) {
  1421. len = -2;
  1422. } else if (buf == NULL || name == NULL || buf_len == 0) {
  1423. len = -1;
  1424. dst[0] = '\0';
  1425. } else {
  1426. name_len = strlen(name);
  1427. e = buf + buf_len;
  1428. len = -1;
  1429. dst[0] = '\0';
  1430. // buf is "var1=val1&var2=val2...". Find variable first
  1431. for (p = buf; p + name_len < e; p++) {
  1432. if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
  1433. !mg_strncasecmp(name, p, name_len)) {
  1434. // Point p to variable value
  1435. p += name_len + 1;
  1436. // Point s to the end of the value
  1437. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1438. if (s == NULL) {
  1439. s = e;
  1440. }
  1441. assert(s >= p);
  1442. // Decode variable into destination buffer
  1443. len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1444. break;
  1445. }
  1446. }
  1447. }
  1448. return len;
  1449. }
  1450. int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
  1451. char *dst, size_t dst_size) {
  1452. const char *s, *p, *end;
  1453. int name_len, len = -1;
  1454. dst[0] = '\0';
  1455. if ((s = mg_get_header(conn, "Cookie")) == NULL) {
  1456. return -1;
  1457. }
  1458. name_len = (int) strlen(cookie_name);
  1459. end = s + strlen(s);
  1460. for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
  1461. if (s[name_len] == '=') {
  1462. s += name_len + 1;
  1463. if ((p = strchr(s, ' ')) == NULL)
  1464. p = end;
  1465. if (p[-1] == ';')
  1466. p--;
  1467. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1468. s++;
  1469. p--;
  1470. }
  1471. if ((size_t) (p - s) < dst_size) {
  1472. len = p - s;
  1473. mg_strlcpy(dst, s, (size_t) len + 1);
  1474. }
  1475. break;
  1476. }
  1477. return len;
  1478. }
  1479. static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1480. size_t buf_len, struct file *filep) {
  1481. struct vec a, b;
  1482. const char *rewrite, *uri = conn->request_info.uri;
  1483. char *p;
  1484. int match_len;
  1485. // Using buf_len - 1 because memmove() for PATH_INFO may shift part
  1486. // of the path one byte on the right.
  1487. mg_snprintf(conn, buf, buf_len - 1, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
  1488. uri);
  1489. rewrite = conn->ctx->config[REWRITE];
  1490. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1491. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1492. mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
  1493. uri + match_len);
  1494. break;
  1495. }
  1496. }
  1497. if (!mg_stat(conn, buf, filep)) {
  1498. // Support PATH_INFO for CGI scripts.
  1499. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1500. if (*p == '/') {
  1501. *p = '\0';
  1502. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1503. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1504. mg_stat(conn, buf, filep)) {
  1505. // Shift PATH_INFO block one character right, e.g.
  1506. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1507. // conn->path_info is pointing to the local variable "path" declared
  1508. // in handle_request(), so PATH_INFO is not valid after
  1509. // handle_request returns.
  1510. conn->path_info = p + 1;
  1511. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1512. p[1] = '/';
  1513. break;
  1514. } else {
  1515. *p = '/';
  1516. }
  1517. }
  1518. }
  1519. }
  1520. }
  1521. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  1522. return (conn->ssl = SSL_new(s)) != NULL &&
  1523. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  1524. func(conn->ssl) == 1;
  1525. }
  1526. // Check whether full request is buffered. Return:
  1527. // -1 if request is malformed
  1528. // 0 if request is not yet fully buffered
  1529. // >0 actual request length, including last \r\n\r\n
  1530. static int get_request_len(const char *buf, int buflen) {
  1531. const char *s, *e;
  1532. int len = 0;
  1533. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1534. // Control characters are not allowed but >=128 is.
  1535. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1536. *s != '\n' && * (const unsigned char *) s < 128) {
  1537. len = -1;
  1538. break; // [i_a] abort scan as soon as one malformed character is found; don't let subsequent \r\n\r\n win us over anyhow
  1539. } else if (s[0] == '\n' && s[1] == '\n') {
  1540. len = (int) (s - buf) + 2;
  1541. } else if (s[0] == '\n' && &s[1] < e &&
  1542. s[1] == '\r' && s[2] == '\n') {
  1543. len = (int) (s - buf) + 3;
  1544. }
  1545. return len;
  1546. }
  1547. // Convert month to the month number. Return -1 on error, or month number
  1548. static int get_month_index(const char *s) {
  1549. size_t i;
  1550. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1551. if (!strcmp(s, month_names[i]))
  1552. return (int) i;
  1553. return -1;
  1554. }
  1555. static int num_leap_years(int year) {
  1556. return year / 4 - year / 100 + year / 400;
  1557. }
  1558. // Parse UTC date-time string, and return the corresponding time_t value.
  1559. static time_t parse_date_string(const char *datetime) {
  1560. static const unsigned short days_before_month[] = {
  1561. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1562. };
  1563. char month_str[32];
  1564. int second, minute, hour, day, month, year, leap_days, days;
  1565. time_t result = (time_t) 0;
  1566. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1567. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1568. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1569. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1570. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1571. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1572. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1573. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1574. year > 1970 &&
  1575. (month = get_month_index(month_str)) != -1) {
  1576. leap_days = num_leap_years(year) - num_leap_years(1970);
  1577. year -= 1970;
  1578. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1579. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1580. }
  1581. return result;
  1582. }
  1583. // Protect against directory disclosure attack by removing '..',
  1584. // excessive '/' and '\' characters
  1585. static void remove_double_dots_and_double_slashes(char *s) {
  1586. char *p = s;
  1587. while (*s != '\0') {
  1588. *p++ = *s++;
  1589. if (s[-1] == '/' || s[-1] == '\\') {
  1590. // Skip all following slashes, backslashes and double-dots
  1591. while (s[0] != '\0') {
  1592. if (s[0] == '/' || s[0] == '\\') {
  1593. s++;
  1594. } else if (s[0] == '.' && s[1] == '.') {
  1595. s += 2;
  1596. } else {
  1597. break;
  1598. }
  1599. }
  1600. }
  1601. }
  1602. *p = '\0';
  1603. }
  1604. static const struct {
  1605. const char *extension;
  1606. size_t ext_len;
  1607. const char *mime_type;
  1608. } builtin_mime_types[] = {
  1609. {".html", 5, "text/html"},
  1610. {".htm", 4, "text/html"},
  1611. {".shtm", 5, "text/html"},
  1612. {".shtml", 6, "text/html"},
  1613. {".css", 4, "text/css"},
  1614. {".js", 3, "application/x-javascript"},
  1615. {".ico", 4, "image/x-icon"},
  1616. {".gif", 4, "image/gif"},
  1617. {".jpg", 4, "image/jpeg"},
  1618. {".jpeg", 5, "image/jpeg"},
  1619. {".png", 4, "image/png"},
  1620. {".svg", 4, "image/svg+xml"},
  1621. {".txt", 4, "text/plain"},
  1622. {".torrent", 8, "application/x-bittorrent"},
  1623. {".wav", 4, "audio/x-wav"},
  1624. {".mp3", 4, "audio/x-mp3"},
  1625. {".mid", 4, "audio/mid"},
  1626. {".m3u", 4, "audio/x-mpegurl"},
  1627. {".ogg", 4, "audio/ogg"},
  1628. {".ram", 4, "audio/x-pn-realaudio"},
  1629. {".xml", 4, "text/xml"},
  1630. {".json", 5, "text/json"},
  1631. {".xslt", 5, "application/xml"},
  1632. {".xsl", 4, "application/xml"},
  1633. {".ra", 3, "audio/x-pn-realaudio"},
  1634. {".doc", 4, "application/msword"},
  1635. {".exe", 4, "application/octet-stream"},
  1636. {".zip", 4, "application/x-zip-compressed"},
  1637. {".xls", 4, "application/excel"},
  1638. {".tgz", 4, "application/x-tar-gz"},
  1639. {".tar", 4, "application/x-tar"},
  1640. {".gz", 3, "application/x-gunzip"},
  1641. {".arj", 4, "application/x-arj-compressed"},
  1642. {".rar", 4, "application/x-arj-compressed"},
  1643. {".rtf", 4, "application/rtf"},
  1644. {".pdf", 4, "application/pdf"},
  1645. {".swf", 4, "application/x-shockwave-flash"},
  1646. {".mpg", 4, "video/mpeg"},
  1647. {".webm", 5, "video/webm"},
  1648. {".mpeg", 5, "video/mpeg"},
  1649. {".mp4", 4, "video/mp4"},
  1650. {".m4v", 4, "video/x-m4v"},
  1651. {".asf", 4, "video/x-ms-asf"},
  1652. {".avi", 4, "video/x-msvideo"},
  1653. {".bmp", 4, "image/bmp"},
  1654. {NULL, 0, NULL}
  1655. };
  1656. const char *mg_get_builtin_mime_type(const char *path) {
  1657. const char *ext;
  1658. size_t i, path_len;
  1659. path_len = strlen(path);
  1660. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1661. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1662. if (path_len > builtin_mime_types[i].ext_len &&
  1663. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1664. return builtin_mime_types[i].mime_type;
  1665. }
  1666. }
  1667. return "text/plain";
  1668. }
  1669. // Look at the "path" extension and figure what mime type it has.
  1670. // Store mime type in the vector.
  1671. static void get_mime_type(struct mg_context *ctx, const char *path,
  1672. struct vec *vec) {
  1673. struct vec ext_vec, mime_vec;
  1674. const char *list, *ext;
  1675. size_t path_len;
  1676. path_len = strlen(path);
  1677. // Scan user-defined mime types first, in case user wants to
  1678. // override default mime types.
  1679. list = ctx->config[EXTRA_MIME_TYPES];
  1680. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1681. // ext now points to the path suffix
  1682. ext = path + path_len - ext_vec.len;
  1683. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1684. *vec = mime_vec;
  1685. return;
  1686. }
  1687. }
  1688. vec->ptr = mg_get_builtin_mime_type(path);
  1689. vec->len = strlen(vec->ptr);
  1690. }
  1691. #ifndef HAVE_MD5
  1692. typedef struct MD5Context {
  1693. uint32_t buf[4];
  1694. uint32_t bits[2];
  1695. unsigned char in[64];
  1696. } MD5_CTX;
  1697. #if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
  1698. #define byteReverse(buf, len) // Do nothing
  1699. #else
  1700. static void byteReverse(unsigned char *buf, unsigned longs) {
  1701. uint32_t t;
  1702. do {
  1703. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1704. ((unsigned) buf[1] << 8 | buf[0]);
  1705. *(uint32_t *) buf = t;
  1706. buf += 4;
  1707. } while (--longs);
  1708. }
  1709. #endif
  1710. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1711. #define F2(x, y, z) F1(z, x, y)
  1712. #define F3(x, y, z) (x ^ y ^ z)
  1713. #define F4(x, y, z) (y ^ (x | ~z))
  1714. #define MD5STEP(f, w, x, y, z, data, s) \
  1715. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1716. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1717. // initialization constants.
  1718. static void MD5Init(MD5_CTX *ctx) {
  1719. ctx->buf[0] = 0x67452301;
  1720. ctx->buf[1] = 0xefcdab89;
  1721. ctx->buf[2] = 0x98badcfe;
  1722. ctx->buf[3] = 0x10325476;
  1723. ctx->bits[0] = 0;
  1724. ctx->bits[1] = 0;
  1725. }
  1726. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1727. register uint32_t a, b, c, d;
  1728. a = buf[0];
  1729. b = buf[1];
  1730. c = buf[2];
  1731. d = buf[3];
  1732. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1733. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1734. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1735. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1736. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1737. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1738. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1739. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1740. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1741. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1742. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1743. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1744. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1745. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1746. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1747. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1748. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1749. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1750. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1751. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1752. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1753. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1754. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1755. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1756. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1757. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1758. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1759. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1760. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1761. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1762. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1763. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1764. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1765. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1766. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1767. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1768. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1769. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1770. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1771. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1772. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1773. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1774. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1775. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1776. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1777. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1778. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1779. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1780. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1781. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1782. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1783. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1784. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1785. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1786. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1787. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1788. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1789. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1790. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1791. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1792. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1793. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1794. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1795. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1796. buf[0] += a;
  1797. buf[1] += b;
  1798. buf[2] += c;
  1799. buf[3] += d;
  1800. }
  1801. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1802. uint32_t t;
  1803. t = ctx->bits[0];
  1804. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1805. ctx->bits[1]++;
  1806. ctx->bits[1] += len >> 29;
  1807. t = (t >> 3) & 0x3f;
  1808. if (t) {
  1809. unsigned char *p = (unsigned char *) ctx->in + t;
  1810. t = 64 - t;
  1811. if (len < t) {
  1812. memcpy(p, buf, len);
  1813. return;
  1814. }
  1815. memcpy(p, buf, t);
  1816. byteReverse(ctx->in, 16);
  1817. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1818. buf += t;
  1819. len -= t;
  1820. }
  1821. while (len >= 64) {
  1822. memcpy(ctx->in, buf, 64);
  1823. byteReverse(ctx->in, 16);
  1824. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1825. buf += 64;
  1826. len -= 64;
  1827. }
  1828. memcpy(ctx->in, buf, len);
  1829. }
  1830. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1831. unsigned count;
  1832. unsigned char *p;
  1833. count = (ctx->bits[0] >> 3) & 0x3F;
  1834. p = ctx->in + count;
  1835. *p++ = 0x80;
  1836. count = 64 - 1 - count;
  1837. if (count < 8) {
  1838. memset(p, 0, count);
  1839. byteReverse(ctx->in, 16);
  1840. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1841. memset(ctx->in, 0, 56);
  1842. } else {
  1843. memset(p, 0, count - 8);
  1844. }
  1845. byteReverse(ctx->in, 14);
  1846. ((uint32_t *) ctx->in)[14] = ctx->bits[0];
  1847. ((uint32_t *) ctx->in)[15] = ctx->bits[1];
  1848. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1849. byteReverse((unsigned char *) ctx->buf, 4);
  1850. memcpy(digest, ctx->buf, 16);
  1851. memset((char *) ctx, 0, sizeof(*ctx));
  1852. }
  1853. #endif // !HAVE_MD5
  1854. // Stringify binary data. Output buffer must be twice as big as input,
  1855. // because each byte takes 2 bytes in string representation
  1856. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1857. static const char *hex = "0123456789abcdef";
  1858. for (; len--; p++) {
  1859. *to++ = hex[p[0] >> 4];
  1860. *to++ = hex[p[0] & 0x0f];
  1861. }
  1862. *to = '\0';
  1863. }
  1864. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1865. void mg_md5(char buf[33], ...) {
  1866. unsigned char hash[16];
  1867. const char *p;
  1868. va_list ap;
  1869. MD5_CTX ctx;
  1870. MD5Init(&ctx);
  1871. va_start(ap, buf);
  1872. while ((p = va_arg(ap, const char *)) != NULL) {
  1873. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1874. }
  1875. va_end(ap);
  1876. MD5Final(hash, &ctx);
  1877. bin2str(buf, hash, sizeof(hash));
  1878. }
  1879. // Check the user's password, return 1 if OK
  1880. static int check_password(const char *method, const char *ha1, const char *uri,
  1881. const char *nonce, const char *nc, const char *cnonce,
  1882. const char *qop, const char *response) {
  1883. char ha2[32 + 1], expected_response[32 + 1];
  1884. // Some of the parameters may be NULL
  1885. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1886. qop == NULL || response == NULL) {
  1887. return 0;
  1888. }
  1889. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1890. // TODO(lsm): check for authentication timeout
  1891. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1892. strlen(response) != 32
  1893. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1894. ) {
  1895. return 0;
  1896. }
  1897. mg_md5(ha2, method, ":", uri, NULL);
  1898. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1899. ":", cnonce, ":", qop, ":", ha2, NULL);
  1900. return mg_strcasecmp(response, expected_response) == 0;
  1901. }
  1902. // Use the global passwords file, if specified by auth_gpass option,
  1903. // or search for .htpasswd in the requested directory.
  1904. static void open_auth_file(struct mg_connection *conn, const char *path,
  1905. struct file *filep) {
  1906. char name[PATH_MAX];
  1907. const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
  1908. if (gpass != NULL) {
  1909. // Use global passwords file
  1910. if (!mg_fopen(conn, gpass, "r", filep)) {
  1911. cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
  1912. }
  1913. } else if (mg_stat(conn, path, filep) && filep->is_directory) {
  1914. mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1915. path, '/', PASSWORDS_FILE_NAME);
  1916. mg_fopen(conn, name, "r", filep);
  1917. } else {
  1918. // Try to find .htpasswd in requested directory.
  1919. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1920. if (e[0] == '/')
  1921. break;
  1922. mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1923. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  1924. mg_fopen(conn, name, "r", filep);
  1925. }
  1926. }
  1927. // Parsed Authorization header
  1928. struct ah {
  1929. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1930. };
  1931. // Return 1 on success. Always initializes the ah structure.
  1932. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1933. size_t buf_size, struct ah *ah) {
  1934. char *name, *value, *s;
  1935. const char *auth_header;
  1936. (void) memset(ah, 0, sizeof(*ah));
  1937. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  1938. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  1939. return 0;
  1940. }
  1941. // Make modifiable copy of the auth header
  1942. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  1943. s = buf;
  1944. // Parse authorization header
  1945. for (;;) {
  1946. // Gobble initial spaces
  1947. while (isspace(* (unsigned char *) s)) {
  1948. s++;
  1949. }
  1950. name = skip_quoted(&s, "=", " ", 0);
  1951. // Value is either quote-delimited, or ends at first comma or space.
  1952. if (s[0] == '\"') {
  1953. s++;
  1954. value = skip_quoted(&s, "\"", " ", '\\');
  1955. if (s[0] == ',') {
  1956. s++;
  1957. }
  1958. } else {
  1959. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  1960. }
  1961. if (*name == '\0') {
  1962. break;
  1963. }
  1964. if (!strcmp(name, "username")) {
  1965. ah->user = value;
  1966. } else if (!strcmp(name, "cnonce")) {
  1967. ah->cnonce = value;
  1968. } else if (!strcmp(name, "response")) {
  1969. ah->response = value;
  1970. } else if (!strcmp(name, "uri")) {
  1971. ah->uri = value;
  1972. } else if (!strcmp(name, "qop")) {
  1973. ah->qop = value;
  1974. } else if (!strcmp(name, "nc")) {
  1975. ah->nc = value;
  1976. } else if (!strcmp(name, "nonce")) {
  1977. ah->nonce = value;
  1978. }
  1979. }
  1980. // CGI needs it as REMOTE_USER
  1981. if (ah->user != NULL) {
  1982. conn->request_info.remote_user = mg_strdup(ah->user);
  1983. } else {
  1984. return 0;
  1985. }
  1986. return 1;
  1987. }
  1988. static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
  1989. char *eof;
  1990. size_t len;
  1991. if (filep->membuf != NULL && *p != NULL) {
  1992. eof = memchr(*p, '\n', &filep->membuf[filep->size] - *p);
  1993. len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
  1994. memcpy(buf, *p, len);
  1995. buf[len] = '\0';
  1996. *p = eof;
  1997. return eof;
  1998. } else if (filep->fp != NULL) {
  1999. return fgets(buf, size, filep->fp);
  2000. } else {
  2001. return NULL;
  2002. }
  2003. }
  2004. // Authorize against the opened passwords file. Return 1 if authorized.
  2005. static int authorize(struct mg_connection *conn, struct file *filep) {
  2006. struct ah ah;
  2007. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
  2008. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  2009. return 0;
  2010. }
  2011. // Loop over passwords file
  2012. p = (char *) filep->membuf;
  2013. while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
  2014. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  2015. continue;
  2016. }
  2017. if (!strcmp(ah.user, f_user) &&
  2018. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  2019. return check_password(conn->request_info.request_method, ha1, ah.uri,
  2020. ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
  2021. }
  2022. return 0;
  2023. }
  2024. // Return 1 if request is authorised, 0 otherwise.
  2025. static int check_authorization(struct mg_connection *conn, const char *path) {
  2026. char fname[PATH_MAX];
  2027. struct vec uri_vec, filename_vec;
  2028. const char *list;
  2029. struct file file = STRUCT_FILE_INITIALIZER;
  2030. int authorized = 1;
  2031. list = conn->ctx->config[PROTECT_URI];
  2032. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  2033. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  2034. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2035. (int) filename_vec.len, filename_vec.ptr);
  2036. if (!mg_fopen(conn, fname, "r", &file)) {
  2037. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2038. }
  2039. break;
  2040. }
  2041. }
  2042. if (!is_file_opened(&file)) {
  2043. open_auth_file(conn, path, &file);
  2044. }
  2045. if (is_file_opened(&file)) {
  2046. authorized = authorize(conn, &file);
  2047. mg_fclose(&file);
  2048. }
  2049. return authorized;
  2050. }
  2051. static void send_authorization_request(struct mg_connection *conn) {
  2052. conn->status_code = 401;
  2053. mg_printf(conn,
  2054. "HTTP/1.1 401 Unauthorized\r\n"
  2055. "Content-Length: 0\r\n"
  2056. "WWW-Authenticate: Digest qop=\"auth\", "
  2057. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2058. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2059. (unsigned long) time(NULL));
  2060. }
  2061. static int is_authorized_for_put(struct mg_connection *conn) {
  2062. struct file file = STRUCT_FILE_INITIALIZER;
  2063. const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
  2064. int ret = 0;
  2065. if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
  2066. ret = authorize(conn, &file);
  2067. mg_fclose(&file);
  2068. }
  2069. return ret;
  2070. }
  2071. int mg_modify_passwords_file(const char *fname, const char *domain,
  2072. const char *user, const char *pass) {
  2073. int found;
  2074. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2075. FILE *fp, *fp2;
  2076. found = 0;
  2077. fp = fp2 = NULL;
  2078. // Regard empty password as no password - remove user record.
  2079. if (pass != NULL && pass[0] == '\0') {
  2080. pass = NULL;
  2081. }
  2082. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2083. // Create the file if does not exist
  2084. if ((fp = fopen(fname, "a+")) != NULL) {
  2085. (void) fclose(fp);
  2086. }
  2087. // Open the given file and temporary file
  2088. if ((fp = fopen(fname, "r")) == NULL) {
  2089. return 0;
  2090. } else if ((fp2 = fopen(tmp, "w+")) == NULL) {
  2091. fclose(fp);
  2092. return 0;
  2093. }
  2094. // Copy the stuff to temporary file
  2095. while (fgets(line, sizeof(line), fp) != NULL) {
  2096. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2097. continue;
  2098. }
  2099. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2100. found++;
  2101. if (pass != NULL) {
  2102. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2103. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2104. }
  2105. } else {
  2106. fprintf(fp2, "%s", line);
  2107. }
  2108. }
  2109. // If new user, just add it
  2110. if (!found && pass != NULL) {
  2111. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2112. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2113. }
  2114. // Close files
  2115. fclose(fp);
  2116. fclose(fp2);
  2117. // Put the temp file in place of real file
  2118. remove(fname);
  2119. rename(tmp, fname);
  2120. return 1;
  2121. }
  2122. struct de {
  2123. struct mg_connection *conn;
  2124. char *file_name;
  2125. struct file file;
  2126. };
  2127. static void url_encode(const char *src, char *dst, size_t dst_len) {
  2128. static const char *dont_escape = "._-$,;~()";
  2129. static const char *hex = "0123456789abcdef";
  2130. const char *end = dst + dst_len - 1;
  2131. for (; *src != '\0' && dst < end; src++, dst++) {
  2132. if (isalnum(*(const unsigned char *) src) ||
  2133. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2134. *dst = *src;
  2135. } else if (dst + 2 < end) {
  2136. dst[0] = '%';
  2137. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2138. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2139. dst += 2;
  2140. }
  2141. }
  2142. *dst = '\0';
  2143. }
  2144. static void print_dir_entry(struct de *de) {
  2145. char size[64], mod[64], href[PATH_MAX];
  2146. if (de->file.is_directory) {
  2147. mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2148. } else {
  2149. // We use (signed) cast below because MSVC 6 compiler cannot
  2150. // convert unsigned __int64 to double. Sigh.
  2151. if (de->file.size < 1024) {
  2152. mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
  2153. } else if (de->file.size < 0x100000) {
  2154. mg_snprintf(de->conn, size, sizeof(size),
  2155. "%.1fk", (double) de->file.size / 1024.0);
  2156. } else if (de->file.size < 0x40000000) {
  2157. mg_snprintf(de->conn, size, sizeof(size),
  2158. "%.1fM", (double) de->file.size / 1048576);
  2159. } else {
  2160. mg_snprintf(de->conn, size, sizeof(size),
  2161. "%.1fG", (double) de->file.size / 1073741824);
  2162. }
  2163. }
  2164. strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
  2165. localtime(&de->file.modification_time));
  2166. url_encode(de->file_name, href, sizeof(href));
  2167. de->conn->num_bytes_sent += mg_printf(de->conn,
  2168. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2169. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2170. de->conn->request_info.uri, href, de->file.is_directory ? "/" : "",
  2171. de->file_name, de->file.is_directory ? "/" : "", mod, size);
  2172. }
  2173. // This function is called from send_directory() and used for
  2174. // sorting directory entries by size, or name, or modification time.
  2175. // On windows, __cdecl specification is needed in case if project is built
  2176. // with __stdcall convention. qsort always requires __cdels callback.
  2177. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2178. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2179. const char *query_string = a->conn->request_info.query_string;
  2180. int cmp_result = 0;
  2181. if (query_string == NULL) {
  2182. query_string = "na";
  2183. }
  2184. if (a->file.is_directory && !b->file.is_directory) {
  2185. return -1; // Always put directories on top
  2186. } else if (!a->file.is_directory && b->file.is_directory) {
  2187. return 1; // Always put directories on top
  2188. } else if (*query_string == 'n') {
  2189. cmp_result = strcmp(a->file_name, b->file_name);
  2190. } else if (*query_string == 's') {
  2191. cmp_result = a->file.size == b->file.size ? 0 :
  2192. a->file.size > b->file.size ? 1 : -1;
  2193. } else if (*query_string == 'd') {
  2194. cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
  2195. a->file.modification_time > b->file.modification_time ? 1 : -1;
  2196. }
  2197. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2198. }
  2199. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2200. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2201. const char *pattern = conn->ctx->config[HIDE_FILES];
  2202. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2203. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2204. }
  2205. static int scan_directory(struct mg_connection *conn, const char *dir,
  2206. void *data, void (*cb)(struct de *, void *)) {
  2207. char path[PATH_MAX];
  2208. struct dirent *dp;
  2209. DIR *dirp;
  2210. struct de de;
  2211. if ((dirp = opendir(dir)) == NULL) {
  2212. return 0;
  2213. } else {
  2214. de.conn = conn;
  2215. while ((dp = readdir(dirp)) != NULL) {
  2216. // Do not show current dir and hidden files
  2217. if (!strcmp(dp->d_name, ".") ||
  2218. !strcmp(dp->d_name, "..") ||
  2219. must_hide_file(conn, dp->d_name)) {
  2220. continue;
  2221. }
  2222. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2223. // If we don't memset stat structure to zero, mtime will have
  2224. // garbage and strftime() will segfault later on in
  2225. // print_dir_entry(). memset is required only if mg_stat()
  2226. // fails. For more details, see
  2227. // http://code.google.com/p/mongoose/issues/detail?id=79
  2228. // mg_stat will memset the whole struct file with zeroes.
  2229. mg_stat(conn, path, &de.file);
  2230. de.file_name = dp->d_name;
  2231. cb(&de, data);
  2232. }
  2233. (void) closedir(dirp);
  2234. }
  2235. return 1;
  2236. }
  2237. struct dir_scan_data {
  2238. struct de *entries;
  2239. int num_entries;
  2240. int arr_size;
  2241. };
  2242. static void dir_scan_callback(struct de *de, void *data) {
  2243. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2244. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2245. dsd->arr_size *= 2;
  2246. dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
  2247. sizeof(dsd->entries[0]));
  2248. }
  2249. if (dsd->entries == NULL) {
  2250. // TODO(lsm): propagate an error to the caller
  2251. dsd->num_entries = 0;
  2252. } else {
  2253. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2254. dsd->entries[dsd->num_entries].file = de->file;
  2255. dsd->entries[dsd->num_entries].conn = de->conn;
  2256. dsd->num_entries++;
  2257. }
  2258. }
  2259. static void handle_directory_request(struct mg_connection *conn,
  2260. const char *dir) {
  2261. int i, sort_direction;
  2262. struct dir_scan_data data = { NULL, 0, 128 };
  2263. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2264. send_http_error(conn, 500, "Cannot open directory",
  2265. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2266. return;
  2267. }
  2268. sort_direction = conn->request_info.query_string != NULL &&
  2269. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2270. conn->must_close = 1;
  2271. mg_printf(conn, "%s",
  2272. "HTTP/1.1 200 OK\r\n"
  2273. "Connection: close\r\n"
  2274. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2275. conn->num_bytes_sent += mg_printf(conn,
  2276. "<html><head><title>Index of %s</title>"
  2277. "<style>th {text-align: left;}</style></head>"
  2278. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2279. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2280. "<th><a href=\"?d%c\">Modified</a></th>"
  2281. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2282. "<tr><td colspan=\"3\"><hr></td></tr>",
  2283. conn->request_info.uri, conn->request_info.uri,
  2284. sort_direction, sort_direction, sort_direction);
  2285. // Print first entry - link to a parent directory
  2286. conn->num_bytes_sent += mg_printf(conn,
  2287. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2288. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2289. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2290. // Sort and print directory entries
  2291. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2292. compare_dir_entries);
  2293. for (i = 0; i < data.num_entries; i++) {
  2294. print_dir_entry(&data.entries[i]);
  2295. free(data.entries[i].file_name);
  2296. }
  2297. free(data.entries);
  2298. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2299. conn->status_code = 200;
  2300. }
  2301. // Send len bytes from the opened file to the client.
  2302. static void send_file_data(struct mg_connection *conn, struct file *filep,
  2303. int64_t offset, int64_t len) {
  2304. char buf[MG_BUF_LEN];
  2305. int to_read, num_read, num_written;
  2306. if (len > 0 && filep->membuf != NULL && filep->size > 0) {
  2307. if (len > filep->size - offset) {
  2308. len = filep->size - offset;
  2309. }
  2310. mg_write(conn, filep->membuf + offset, (size_t) len);
  2311. } else if (len > 0 && filep->fp != NULL) {
  2312. fseeko(filep->fp, offset, SEEK_SET);
  2313. while (len > 0) {
  2314. // Calculate how much to read from the file in the buffer
  2315. to_read = sizeof(buf);
  2316. if ((int64_t) to_read > len) {
  2317. to_read = (int) len;
  2318. }
  2319. // Read from file, exit the loop on error
  2320. if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
  2321. break;
  2322. }
  2323. // Send read bytes to the client, exit the loop on error
  2324. if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
  2325. break;
  2326. }
  2327. // Both read and were successful, adjust counters
  2328. conn->num_bytes_sent += num_written;
  2329. len -= num_written;
  2330. }
  2331. }
  2332. }
  2333. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2334. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2335. }
  2336. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2337. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2338. }
  2339. static void construct_etag(char *buf, size_t buf_len,
  2340. const struct file *filep) {
  2341. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2342. (unsigned long) filep->modification_time, filep->size);
  2343. }
  2344. static void fclose_on_exec(struct file *filep) {
  2345. if (filep != NULL && filep->fp != NULL) {
  2346. #ifndef _WIN32
  2347. fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
  2348. #endif
  2349. }
  2350. }
  2351. static void handle_file_request(struct mg_connection *conn, const char *path,
  2352. struct file *filep) {
  2353. char date[64], lm[64], etag[64], range[64];
  2354. const char *msg = "OK", *hdr;
  2355. time_t curtime = time(NULL);
  2356. int64_t cl, r1, r2;
  2357. struct vec mime_vec;
  2358. int n;
  2359. get_mime_type(conn->ctx, path, &mime_vec);
  2360. cl = filep->size;
  2361. conn->status_code = 200;
  2362. range[0] = '\0';
  2363. if (!mg_fopen(conn, path, "rb", filep)) {
  2364. send_http_error(conn, 500, http_500_error,
  2365. "fopen(%s): %s", path, strerror(ERRNO));
  2366. return;
  2367. }
  2368. fclose_on_exec(filep);
  2369. // If Range: header specified, act accordingly
  2370. r1 = r2 = 0;
  2371. hdr = mg_get_header(conn, "Range");
  2372. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
  2373. r1 >= 0 && r2 > 0) {
  2374. conn->status_code = 206;
  2375. cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
  2376. mg_snprintf(conn, range, sizeof(range),
  2377. "Content-Range: bytes "
  2378. "%" INT64_FMT "-%"
  2379. INT64_FMT "/%" INT64_FMT "\r\n",
  2380. r1, r1 + cl - 1, filep->size);
  2381. msg = "Partial Content";
  2382. }
  2383. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2384. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2385. gmt_time_string(date, sizeof(date), &curtime);
  2386. gmt_time_string(lm, sizeof(lm), &filep->modification_time);
  2387. construct_etag(etag, sizeof(etag), filep);
  2388. (void) mg_printf(conn,
  2389. "HTTP/1.1 %d %s\r\n"
  2390. "Date: %s\r\n"
  2391. "Last-Modified: %s\r\n"
  2392. "Etag: %s\r\n"
  2393. "Content-Type: %.*s\r\n"
  2394. "Content-Length: %" INT64_FMT "\r\n"
  2395. "Connection: %s\r\n"
  2396. "Accept-Ranges: bytes\r\n"
  2397. "%s\r\n",
  2398. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2399. mime_vec.ptr, cl, suggest_connection_header(conn), range);
  2400. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2401. send_file_data(conn, filep, r1, cl);
  2402. }
  2403. mg_fclose(filep);
  2404. }
  2405. void mg_send_file(struct mg_connection *conn, const char *path) {
  2406. struct file file;
  2407. if (mg_stat(conn, path, &file)) {
  2408. handle_file_request(conn, path, &file);
  2409. } else {
  2410. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2411. }
  2412. }
  2413. // Parse HTTP headers from the given buffer, advance buffer to the point
  2414. // where parsing stopped.
  2415. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2416. int i;
  2417. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2418. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2419. ri->http_headers[i].value = skip(buf, "\r\n");
  2420. if (ri->http_headers[i].name[0] == '\0')
  2421. break;
  2422. ri->num_headers = i + 1;
  2423. }
  2424. }
  2425. static int is_valid_http_method(const char *method) {
  2426. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2427. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2428. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2429. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
  2430. }
  2431. // Parse HTTP request, fill in mg_request_info structure.
  2432. // This function modifies the buffer by NUL-terminating
  2433. // HTTP request components, header names and header values.
  2434. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2435. int request_length = get_request_len(buf, len);
  2436. if (request_length > 0) {
  2437. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2438. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2439. ri->num_headers = 0;
  2440. buf[request_length - 1] = '\0';
  2441. // RFC says that all initial whitespaces should be ingored
  2442. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2443. buf++;
  2444. }
  2445. ri->request_method = skip(&buf, " ");
  2446. ri->uri = skip(&buf, " ");
  2447. ri->http_version = skip(&buf, "\r\n");
  2448. parse_http_headers(&buf, ri);
  2449. }
  2450. return request_length;
  2451. }
  2452. static int parse_http_request(char *buf, int len, struct mg_request_info *ri) {
  2453. int result = parse_http_message(buf, len, ri);
  2454. if (result > 0 &&
  2455. is_valid_http_method(ri->request_method) &&
  2456. !strncmp(ri->http_version, "HTTP/", 5)) {
  2457. ri->http_version += 5; // Skip "HTTP/"
  2458. } else {
  2459. result = -1;
  2460. }
  2461. return result;
  2462. }
  2463. static int parse_http_response(char *buf, int len, struct mg_request_info *ri) {
  2464. int result = parse_http_message(buf, len, ri);
  2465. return result > 0 && !strncmp(ri->request_method, "HTTP/", 5) ? result : -1;
  2466. }
  2467. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2468. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2469. // buffer (which marks the end of HTTP request). Buffer buf may already
  2470. // have some data. The length of the data is stored in nread.
  2471. // Upon every read operation, increase nread by the number of bytes read.
  2472. static int read_request(FILE *fp, struct mg_connection *conn,
  2473. char *buf, int bufsiz, int *nread) {
  2474. int request_len, n = 1;
  2475. request_len = get_request_len(buf, *nread);
  2476. while (*nread < bufsiz && request_len == 0 && n > 0) {
  2477. n = pull(fp, conn, buf + *nread, bufsiz - *nread);
  2478. if (n > 0) {
  2479. *nread += n;
  2480. request_len = get_request_len(buf, *nread);
  2481. }
  2482. }
  2483. if (n < 0) {
  2484. // recv() error -> propagate error; do not process a b0rked-with-very-high-probability request
  2485. return -1;
  2486. }
  2487. return request_len;
  2488. }
  2489. // For given directory path, substitute it to valid index file.
  2490. // Return 0 if index file has been found, -1 if not found.
  2491. // If the file is found, it's stats is returned in stp.
  2492. static int substitute_index_file(struct mg_connection *conn, char *path,
  2493. size_t path_len, struct file *filep) {
  2494. const char *list = conn->ctx->config[INDEX_FILES];
  2495. struct file file = STRUCT_FILE_INITIALIZER;
  2496. struct vec filename_vec;
  2497. size_t n = strlen(path);
  2498. int found = 0;
  2499. // The 'path' given to us points to the directory. Remove all trailing
  2500. // directory separator characters from the end of the path, and
  2501. // then append single directory separator character.
  2502. while (n > 0 && path[n - 1] == '/') {
  2503. n--;
  2504. }
  2505. path[n] = '/';
  2506. // Traverse index files list. For each entry, append it to the given
  2507. // path and see if the file exists. If it exists, break the loop
  2508. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2509. // Ignore too long entries that may overflow path buffer
  2510. if (filename_vec.len > path_len - (n + 2))
  2511. continue;
  2512. // Prepare full path to the index file
  2513. mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2514. // Does it exist?
  2515. if (mg_stat(conn, path, &file)) {
  2516. // Yes it does, break the loop
  2517. *filep = file;
  2518. found = 1;
  2519. break;
  2520. }
  2521. }
  2522. // If no index file exists, restore directory path
  2523. if (!found) {
  2524. path[n] = '\0';
  2525. }
  2526. return found;
  2527. }
  2528. // Return True if we should reply 304 Not Modified.
  2529. static int is_not_modified(const struct mg_connection *conn,
  2530. const struct file *filep) {
  2531. char etag[64];
  2532. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2533. const char *inm = mg_get_header(conn, "If-None-Match");
  2534. construct_etag(etag, sizeof(etag), filep);
  2535. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2536. (ims != NULL && filep->modification_time <= parse_date_string(ims));
  2537. }
  2538. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2539. SOCKET sock, SSL *ssl) {
  2540. const char *expect, *body;
  2541. char buf[MG_BUF_LEN];
  2542. int to_read, nread, buffered_len, success = 0;
  2543. expect = mg_get_header(conn, "Expect");
  2544. assert(fp != NULL);
  2545. if (conn->content_len == -1) {
  2546. send_http_error(conn, 411, "Length Required", "%s", "");
  2547. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2548. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2549. } else {
  2550. if (expect != NULL) {
  2551. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2552. }
  2553. body = conn->buf + conn->request_len + conn->consumed_content;
  2554. buffered_len = &conn->buf[conn->data_len] - body;
  2555. assert(buffered_len >= 0);
  2556. assert(conn->consumed_content == 0);
  2557. if (buffered_len > 0) {
  2558. if ((int64_t) buffered_len > conn->content_len) {
  2559. buffered_len = (int) conn->content_len;
  2560. }
  2561. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2562. conn->consumed_content += buffered_len;
  2563. }
  2564. nread = 0;
  2565. while (conn->consumed_content < conn->content_len) {
  2566. to_read = sizeof(buf);
  2567. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2568. to_read = (int) (conn->content_len - conn->consumed_content);
  2569. }
  2570. nread = pull(NULL, conn, buf, to_read);
  2571. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2572. break;
  2573. }
  2574. conn->consumed_content += nread;
  2575. }
  2576. if (conn->consumed_content == conn->content_len) {
  2577. success = nread >= 0;
  2578. }
  2579. // Each error code path in this function must send an error
  2580. if (!success) {
  2581. send_http_error(conn, 577, http_500_error, "%s", "");
  2582. }
  2583. }
  2584. return success;
  2585. }
  2586. #if !defined(NO_CGI)
  2587. // This structure helps to create an environment for the spawned CGI program.
  2588. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2589. // last element must be NULL.
  2590. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2591. // strings must reside in a contiguous buffer. The end of the buffer is
  2592. // marked by two '\0' characters.
  2593. // We satisfy both worlds: we create an envp array (which is vars), all
  2594. // entries are actually pointers inside buf.
  2595. struct cgi_env_block {
  2596. struct mg_connection *conn;
  2597. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2598. int len; // Space taken
  2599. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2600. int nvars; // Number of variables
  2601. };
  2602. static char *addenv(struct cgi_env_block *block,
  2603. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2604. PRINTF_ARGS(2, 3);
  2605. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2606. // pointer into the vars array.
  2607. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2608. int n, space;
  2609. char *added;
  2610. va_list ap;
  2611. // Calculate how much space is left in the buffer
  2612. space = sizeof(block->buf) - block->len - 2;
  2613. assert(space >= 0);
  2614. // Make a pointer to the free space int the buffer
  2615. added = block->buf + block->len;
  2616. // Copy VARIABLE=VALUE\0 string into the free space
  2617. va_start(ap, fmt);
  2618. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2619. va_end(ap);
  2620. // Make sure we do not overflow buffer and the envp array
  2621. if (n > 0 && n + 1 < space &&
  2622. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2623. // Append a pointer to the added string into the envp array
  2624. block->vars[block->nvars++] = added;
  2625. // Bump up used length counter. Include \0 terminator
  2626. block->len += n + 1;
  2627. } else {
  2628. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2629. }
  2630. return added;
  2631. }
  2632. static void prepare_cgi_environment(struct mg_connection *conn,
  2633. const char *prog,
  2634. struct cgi_env_block *blk) {
  2635. const char *s, *slash;
  2636. struct vec var_vec;
  2637. char *p, src_addr[20];
  2638. int i;
  2639. blk->len = blk->nvars = 0;
  2640. blk->conn = conn;
  2641. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2642. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2643. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2644. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2645. // Prepare the environment block
  2646. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2647. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2648. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2649. // TODO(lsm): fix this for IPv6 case
  2650. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2651. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2652. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2653. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2654. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2655. // SCRIPT_NAME
  2656. assert(conn->request_info.uri[0] == '/');
  2657. slash = strrchr(conn->request_info.uri, '/');
  2658. if ((s = strrchr(prog, '/')) == NULL)
  2659. s = prog;
  2660. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2661. conn->request_info.uri, s);
  2662. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2663. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2664. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2665. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2666. addenv(blk, "CONTENT_TYPE=%s", s);
  2667. if (conn->request_info.query_string != NULL)
  2668. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2669. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2670. addenv(blk, "CONTENT_LENGTH=%s", s);
  2671. if ((s = getenv("PATH")) != NULL)
  2672. addenv(blk, "PATH=%s", s);
  2673. if (conn->path_info != NULL) {
  2674. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2675. }
  2676. #if defined(_WIN32)
  2677. if ((s = getenv("COMSPEC")) != NULL) {
  2678. addenv(blk, "COMSPEC=%s", s);
  2679. }
  2680. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2681. addenv(blk, "SYSTEMROOT=%s", s);
  2682. }
  2683. if ((s = getenv("SystemDrive")) != NULL) {
  2684. addenv(blk, "SystemDrive=%s", s);
  2685. }
  2686. #else
  2687. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2688. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2689. #endif // _WIN32
  2690. if ((s = getenv("PERLLIB")) != NULL)
  2691. addenv(blk, "PERLLIB=%s", s);
  2692. if (conn->request_info.remote_user != NULL) {
  2693. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2694. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2695. }
  2696. // Add all headers as HTTP_* variables
  2697. for (i = 0; i < conn->request_info.num_headers; i++) {
  2698. p = addenv(blk, "HTTP_%s=%s",
  2699. conn->request_info.http_headers[i].name,
  2700. conn->request_info.http_headers[i].value);
  2701. // Convert variable name into uppercase, and change - to _
  2702. for (; *p != '=' && *p != '\0'; p++) {
  2703. if (*p == '-')
  2704. *p = '_';
  2705. *p = (char) toupper(* (unsigned char *) p);
  2706. }
  2707. }
  2708. // Add user-specified variables
  2709. s = conn->ctx->config[CGI_ENVIRONMENT];
  2710. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2711. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2712. }
  2713. blk->vars[blk->nvars++] = NULL;
  2714. blk->buf[blk->len++] = '\0';
  2715. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2716. assert(blk->len > 0);
  2717. assert(blk->len < (int) sizeof(blk->buf));
  2718. }
  2719. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2720. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2721. const char *status, *status_text;
  2722. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2723. struct mg_request_info ri;
  2724. struct cgi_env_block blk;
  2725. FILE *in, *out;
  2726. struct file fout = STRUCT_FILE_INITIALIZER;
  2727. pid_t pid;
  2728. prepare_cgi_environment(conn, prog, &blk);
  2729. // CGI must be executed in its own directory. 'dir' must point to the
  2730. // directory containing executable program, 'p' must point to the
  2731. // executable program name relative to 'dir'.
  2732. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2733. if ((p = strrchr(dir, '/')) != NULL) {
  2734. *p++ = '\0';
  2735. } else {
  2736. dir[0] = '.', dir[1] = '\0';
  2737. p = (char *) prog;
  2738. }
  2739. pid = (pid_t) -1;
  2740. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2741. in = out = NULL;
  2742. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2743. send_http_error(conn, 500, http_500_error,
  2744. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2745. goto done;
  2746. }
  2747. pid = spawn_process(conn, p, blk.buf, blk.vars, fd_stdin[0], fd_stdout[1],
  2748. dir);
  2749. // spawn_process() must close those!
  2750. // If we don't mark them as closed, close() attempt before
  2751. // return from this function throws an exception on Windows.
  2752. // Windows does not like when closed descriptor is closed again.
  2753. fd_stdin[0] = fd_stdout[1] = -1;
  2754. if (pid == (pid_t) -1) {
  2755. send_http_error(conn, 500, http_500_error,
  2756. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2757. goto done;
  2758. }
  2759. if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2760. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2761. send_http_error(conn, 500, http_500_error,
  2762. "fopen: %s", strerror(ERRNO));
  2763. goto done;
  2764. }
  2765. setbuf(in, NULL);
  2766. setbuf(out, NULL);
  2767. fout.fp = out;
  2768. // Send POST data to the CGI process if needed
  2769. if (!strcmp(conn->request_info.request_method, "POST") &&
  2770. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2771. goto done;
  2772. }
  2773. // Close so child gets an EOF.
  2774. fclose(in);
  2775. in = NULL;
  2776. fd_stdin[1] = -1;
  2777. // Now read CGI reply into a buffer. We need to set correct
  2778. // status code, thus we need to see all HTTP headers first.
  2779. // Do not send anything back to client, until we buffer in all
  2780. // HTTP headers.
  2781. data_len = 0;
  2782. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2783. if (headers_len <= 0) {
  2784. send_http_error(conn, 500, http_500_error,
  2785. "CGI program sent malformed or too big (>%u bytes) "
  2786. "HTTP headers: [%.*s]",
  2787. (unsigned) sizeof(buf), data_len, buf);
  2788. goto done;
  2789. }
  2790. pbuf = buf;
  2791. buf[headers_len - 1] = '\0';
  2792. parse_http_headers(&pbuf, &ri);
  2793. // Make up and send the status line
  2794. status_text = "OK";
  2795. if ((status = get_header(&ri, "Status")) != NULL) {
  2796. conn->status_code = atoi(status);
  2797. status_text = status;
  2798. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2799. status_text++;
  2800. }
  2801. } else if (get_header(&ri, "Location") != NULL) {
  2802. conn->status_code = 302;
  2803. } else {
  2804. conn->status_code = 200;
  2805. }
  2806. if (get_header(&ri, "Connection") != NULL &&
  2807. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2808. conn->must_close = 1;
  2809. }
  2810. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2811. status_text);
  2812. // Send headers
  2813. for (i = 0; i < ri.num_headers; i++) {
  2814. mg_printf(conn, "%s: %s\r\n",
  2815. ri.http_headers[i].name, ri.http_headers[i].value);
  2816. }
  2817. mg_write(conn, "\r\n", 2);
  2818. // Send chunk of data that may have been read after the headers
  2819. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2820. (size_t)(data_len - headers_len));
  2821. // Read the rest of CGI output and send to the client
  2822. send_file_data(conn, &fout, 0, INT64_MAX);
  2823. done:
  2824. if (pid != (pid_t) -1) {
  2825. kill(pid, SIGKILL);
  2826. }
  2827. if (fd_stdin[0] != -1) {
  2828. close(fd_stdin[0]);
  2829. }
  2830. if (fd_stdout[1] != -1) {
  2831. close(fd_stdout[1]);
  2832. }
  2833. if (in != NULL) {
  2834. fclose(in);
  2835. } else if (fd_stdin[1] != -1) {
  2836. close(fd_stdin[1]);
  2837. }
  2838. if (out != NULL) {
  2839. fclose(out);
  2840. } else if (fd_stdout[0] != -1) {
  2841. close(fd_stdout[0]);
  2842. }
  2843. }
  2844. #endif // !NO_CGI
  2845. // For a given PUT path, create all intermediate subdirectories
  2846. // for given path. Return 0 if the path itself is a directory,
  2847. // or -1 on error, 1 if OK.
  2848. static int put_dir(struct mg_connection *conn, const char *path) {
  2849. char buf[PATH_MAX];
  2850. const char *s, *p;
  2851. struct file file;
  2852. int len, res = 1;
  2853. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  2854. len = p - path;
  2855. if (len >= (int) sizeof(buf)) {
  2856. res = -1;
  2857. break;
  2858. }
  2859. memcpy(buf, path, len);
  2860. buf[len] = '\0';
  2861. // Try to create intermediate directory
  2862. DEBUG_TRACE(("mkdir(%s)", buf));
  2863. if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
  2864. res = -1;
  2865. break;
  2866. }
  2867. // Is path itself a directory?
  2868. if (p[1] == '\0') {
  2869. res = 0;
  2870. }
  2871. }
  2872. return res;
  2873. }
  2874. static void put_file(struct mg_connection *conn, const char *path) {
  2875. struct file file;
  2876. const char *range;
  2877. int64_t r1, r2;
  2878. int rc;
  2879. conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
  2880. if ((rc = put_dir(conn, path)) == 0) {
  2881. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2882. } else if (rc == -1) {
  2883. send_http_error(conn, 500, http_500_error,
  2884. "put_dir(%s): %s", path, strerror(ERRNO));
  2885. } else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
  2886. mg_fclose(&file);
  2887. send_http_error(conn, 500, http_500_error,
  2888. "fopen(%s): %s", path, strerror(ERRNO));
  2889. } else {
  2890. fclose_on_exec(&file);
  2891. range = mg_get_header(conn, "Content-Range");
  2892. r1 = r2 = 0;
  2893. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  2894. conn->status_code = 206;
  2895. fseeko(file.fp, r1, SEEK_SET);
  2896. }
  2897. if (forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
  2898. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2899. }
  2900. mg_fclose(&file);
  2901. }
  2902. }
  2903. static void send_ssi_file(struct mg_connection *, const char *,
  2904. struct file *, int);
  2905. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  2906. char *tag, int include_level) {
  2907. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  2908. struct file file;
  2909. // sscanf() is safe here, since send_ssi_file() also uses buffer
  2910. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  2911. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  2912. // File name is relative to the webserver root
  2913. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  2914. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  2915. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
  2916. // File name is relative to the webserver working directory
  2917. // or it is absolute system path
  2918. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  2919. } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  2920. // File name is relative to the currect document
  2921. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  2922. if ((p = strrchr(path, '/')) != NULL) {
  2923. p[1] = '\0';
  2924. }
  2925. (void) mg_snprintf(conn, path + strlen(path),
  2926. sizeof(path) - strlen(path), "%s", file_name);
  2927. } else {
  2928. cry(conn, "Bad SSI #include: [%s]", tag);
  2929. return;
  2930. }
  2931. if (!mg_fopen(conn, path, "rb", &file)) {
  2932. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  2933. tag, path, strerror(ERRNO));
  2934. } else {
  2935. fclose_on_exec(&file);
  2936. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  2937. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  2938. send_ssi_file(conn, path, &file, include_level + 1);
  2939. } else {
  2940. send_file_data(conn, &file, 0, INT64_MAX);
  2941. }
  2942. mg_fclose(&file);
  2943. }
  2944. }
  2945. #if !defined(NO_POPEN)
  2946. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  2947. char cmd[MG_BUF_LEN];
  2948. struct file file = STRUCT_FILE_INITIALIZER;
  2949. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  2950. cry(conn, "Bad SSI #exec: [%s]", tag);
  2951. } else if ((file.fp = popen(cmd, "r")) == NULL) {
  2952. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  2953. } else {
  2954. send_file_data(conn, &file, 0, INT64_MAX);
  2955. pclose(file.fp);
  2956. }
  2957. }
  2958. #endif // !NO_POPEN
  2959. static int mg_fgetc(struct file *filep, int offset) {
  2960. if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
  2961. return ((unsigned char *) filep->membuf)[offset];
  2962. } else if (filep->fp != NULL) {
  2963. return fgetc(filep->fp);
  2964. } else {
  2965. return EOF;
  2966. }
  2967. }
  2968. static void send_ssi_file(struct mg_connection *conn, const char *path,
  2969. struct file *filep, int include_level) {
  2970. char buf[MG_BUF_LEN];
  2971. int ch, offset, len, in_ssi_tag;
  2972. if (include_level > 10) {
  2973. cry(conn, "SSI #include level is too deep (%s)", path);
  2974. return;
  2975. }
  2976. in_ssi_tag = len = offset = 0;
  2977. while ((ch = mg_fgetc(filep, offset)) != EOF) {
  2978. if (in_ssi_tag && ch == '>') {
  2979. in_ssi_tag = 0;
  2980. buf[len++] = (char) ch;
  2981. buf[len] = '\0';
  2982. assert(len <= (int) sizeof(buf));
  2983. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  2984. // Not an SSI tag, pass it
  2985. (void) mg_write(conn, buf, (size_t) len);
  2986. } else {
  2987. if (!memcmp(buf + 5, "include", 7)) {
  2988. do_ssi_include(conn, path, buf + 12, include_level);
  2989. #if !defined(NO_POPEN)
  2990. } else if (!memcmp(buf + 5, "exec", 4)) {
  2991. do_ssi_exec(conn, buf + 9);
  2992. #endif // !NO_POPEN
  2993. } else {
  2994. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  2995. }
  2996. }
  2997. len = 0;
  2998. } else if (in_ssi_tag) {
  2999. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  3000. // Not an SSI tag
  3001. in_ssi_tag = 0;
  3002. } else if (len == (int) sizeof(buf) - 2) {
  3003. cry(conn, "%s: SSI tag is too large", path);
  3004. len = 0;
  3005. }
  3006. buf[len++] = ch & 0xff;
  3007. } else if (ch == '<') {
  3008. in_ssi_tag = 1;
  3009. if (len > 0) {
  3010. mg_write(conn, buf, (size_t) len);
  3011. }
  3012. len = 0;
  3013. buf[len++] = ch & 0xff;
  3014. } else {
  3015. buf[len++] = ch & 0xff;
  3016. if (len == (int) sizeof(buf)) {
  3017. mg_write(conn, buf, (size_t) len);
  3018. len = 0;
  3019. }
  3020. }
  3021. }
  3022. // Send the rest of buffered data
  3023. if (len > 0) {
  3024. mg_write(conn, buf, (size_t) len);
  3025. }
  3026. }
  3027. static void handle_ssi_file_request(struct mg_connection *conn,
  3028. const char *path) {
  3029. struct file file;
  3030. if (!mg_fopen(conn, path, "rb", &file)) {
  3031. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  3032. strerror(ERRNO));
  3033. } else {
  3034. conn->must_close = 1;
  3035. fclose_on_exec(&file);
  3036. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  3037. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  3038. suggest_connection_header(conn));
  3039. send_ssi_file(conn, path, &file, 0);
  3040. mg_fclose(&file);
  3041. }
  3042. }
  3043. static void send_options(struct mg_connection *conn) {
  3044. conn->status_code = 200;
  3045. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3046. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
  3047. "DAV: 1\r\n\r\n");
  3048. }
  3049. // Writes PROPFIND properties for a collection element
  3050. static void print_props(struct mg_connection *conn, const char* uri,
  3051. struct file *filep) {
  3052. char mtime[64];
  3053. gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
  3054. conn->num_bytes_sent += mg_printf(conn,
  3055. "<d:response>"
  3056. "<d:href>%s</d:href>"
  3057. "<d:propstat>"
  3058. "<d:prop>"
  3059. "<d:resourcetype>%s</d:resourcetype>"
  3060. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3061. "<d:getlastmodified>%s</d:getlastmodified>"
  3062. "</d:prop>"
  3063. "<d:status>HTTP/1.1 200 OK</d:status>"
  3064. "</d:propstat>"
  3065. "</d:response>\n",
  3066. uri,
  3067. filep->is_directory ? "<d:collection/>" : "",
  3068. filep->size,
  3069. mtime);
  3070. }
  3071. static void print_dav_dir_entry(struct de *de, void *data) {
  3072. char href[PATH_MAX];
  3073. struct mg_connection *conn = (struct mg_connection *) data;
  3074. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3075. conn->request_info.uri, de->file_name);
  3076. print_props(conn, href, &de->file);
  3077. }
  3078. static void handle_propfind(struct mg_connection *conn, const char *path,
  3079. struct file *filep) {
  3080. const char *depth = mg_get_header(conn, "Depth");
  3081. conn->must_close = 1;
  3082. conn->status_code = 207;
  3083. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3084. "Connection: close\r\n"
  3085. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3086. conn->num_bytes_sent += mg_printf(conn,
  3087. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3088. "<d:multistatus xmlns:d='DAV:'>\n");
  3089. // Print properties for the requested resource itself
  3090. print_props(conn, conn->request_info.uri, filep);
  3091. // If it is a directory, print directory entries too if Depth is not 0
  3092. if (filep->is_directory &&
  3093. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3094. (depth == NULL || strcmp(depth, "0") != 0)) {
  3095. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3096. }
  3097. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3098. }
  3099. #if defined(USE_WEBSOCKET)
  3100. // START OF SHA-1 code
  3101. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3102. #define SHA1HANDSOFF
  3103. #if defined(__sun)
  3104. #include "solarisfixes.h"
  3105. #endif
  3106. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3107. #if BYTE_ORDER == LITTLE_ENDIAN
  3108. #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  3109. |(rol(block->l[i],8)&0x00FF00FF))
  3110. #elif BYTE_ORDER == BIG_ENDIAN
  3111. #define blk0(i) block->l[i]
  3112. #else
  3113. #error "Endianness not defined!"
  3114. #endif
  3115. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3116. ^block->l[(i+2)&15]^block->l[i&15],1))
  3117. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3118. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3119. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3120. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3121. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3122. typedef struct {
  3123. uint32_t state[5];
  3124. uint32_t count[2];
  3125. unsigned char buffer[64];
  3126. } SHA1_CTX;
  3127. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3128. uint32_t a, b, c, d, e;
  3129. typedef union { unsigned char c[64]; uint32_t l[16]; } CHAR64LONG16;
  3130. CHAR64LONG16 block[1];
  3131. memcpy(block, buffer, 64);
  3132. a = state[0];
  3133. b = state[1];
  3134. c = state[2];
  3135. d = state[3];
  3136. e = state[4];
  3137. 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);
  3138. 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);
  3139. 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);
  3140. 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);
  3141. 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);
  3142. 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);
  3143. 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);
  3144. 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);
  3145. 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);
  3146. 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);
  3147. 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);
  3148. 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);
  3149. 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);
  3150. 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);
  3151. 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);
  3152. 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);
  3153. 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);
  3154. 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);
  3155. 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);
  3156. 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);
  3157. state[0] += a;
  3158. state[1] += b;
  3159. state[2] += c;
  3160. state[3] += d;
  3161. state[4] += e;
  3162. a = b = c = d = e = 0;
  3163. memset(block, '\0', sizeof(block));
  3164. }
  3165. static void SHA1Init(SHA1_CTX* context) {
  3166. context->state[0] = 0x67452301;
  3167. context->state[1] = 0xEFCDAB89;
  3168. context->state[2] = 0x98BADCFE;
  3169. context->state[3] = 0x10325476;
  3170. context->state[4] = 0xC3D2E1F0;
  3171. context->count[0] = context->count[1] = 0;
  3172. }
  3173. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3174. uint32_t len) {
  3175. uint32_t i, j;
  3176. j = context->count[0];
  3177. if ((context->count[0] += len << 3) < j)
  3178. context->count[1]++;
  3179. context->count[1] += (len>>29);
  3180. j = (j >> 3) & 63;
  3181. if ((j + len) > 63) {
  3182. memcpy(&context->buffer[j], data, (i = 64-j));
  3183. SHA1Transform(context->state, context->buffer);
  3184. for ( ; i + 63 < len; i += 64) {
  3185. SHA1Transform(context->state, &data[i]);
  3186. }
  3187. j = 0;
  3188. }
  3189. else i = 0;
  3190. memcpy(&context->buffer[j], &data[i], len - i);
  3191. }
  3192. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3193. unsigned i;
  3194. unsigned char finalcount[8], c;
  3195. for (i = 0; i < 8; i++) {
  3196. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3197. >> ((3-(i & 3)) * 8) ) & 255);
  3198. }
  3199. c = 0200;
  3200. SHA1Update(context, &c, 1);
  3201. while ((context->count[0] & 504) != 448) {
  3202. c = 0000;
  3203. SHA1Update(context, &c, 1);
  3204. }
  3205. SHA1Update(context, finalcount, 8);
  3206. for (i = 0; i < 20; i++) {
  3207. digest[i] = (unsigned char)
  3208. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3209. }
  3210. memset(context, '\0', sizeof(*context));
  3211. memset(&finalcount, '\0', sizeof(finalcount));
  3212. }
  3213. // END OF SHA1 CODE
  3214. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3215. static const char *b64 =
  3216. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3217. int i, j, a, b, c;
  3218. for (i = j = 0; i < src_len; i += 3) {
  3219. a = src[i];
  3220. b = i + 1 >= src_len ? 0 : src[i + 1];
  3221. c = i + 2 >= src_len ? 0 : src[i + 2];
  3222. dst[j++] = b64[a >> 2];
  3223. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3224. if (i + 1 < src_len) {
  3225. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3226. }
  3227. if (i + 2 < src_len) {
  3228. dst[j++] = b64[c & 63];
  3229. }
  3230. }
  3231. while (j % 4 != 0) {
  3232. dst[j++] = '=';
  3233. }
  3234. dst[j++] = '\0';
  3235. }
  3236. static void send_websocket_handshake(struct mg_connection *conn) {
  3237. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3238. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3239. SHA1_CTX sha_ctx;
  3240. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3241. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3242. SHA1Init(&sha_ctx);
  3243. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3244. SHA1Final((unsigned char *) sha, &sha_ctx);
  3245. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3246. mg_printf(conn, "%s%s%s",
  3247. "HTTP/1.1 101 Switching Protocols\r\n"
  3248. "Upgrade: websocket\r\n"
  3249. "Connection: Upgrade\r\n"
  3250. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3251. }
  3252. static void read_websocket(struct mg_connection *conn) {
  3253. unsigned char *mask, *buf = (unsigned char *) conn->buf + conn->request_len;
  3254. int n, len, mask_len, body_len, discard_len;
  3255. for (;;) {
  3256. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3257. len = buf[1] & 127;
  3258. mask_len = buf[1] & 128 ? 4 : 0;
  3259. if (len < 126) {
  3260. conn->content_len = 2 + mask_len + len;
  3261. mask = buf + 2;
  3262. } else if (len == 126 && body_len >= 4) {
  3263. conn->content_len = 2 + mask_len + ((((int) buf[2]) << 8) + buf[3]);
  3264. mask = buf + 4;
  3265. } else if (body_len >= 10) {
  3266. conn->content_len = 2 + mask_len +
  3267. (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) |
  3268. htonl(* (uint32_t *) &buf[6]);
  3269. mask = buf + 10;
  3270. }
  3271. }
  3272. if (conn->content_len > 0) {
  3273. if (call_user(conn, MG_WEBSOCKET_MESSAGE) != NULL) {
  3274. break; // Callback signalled to exit
  3275. }
  3276. discard_len = conn->content_len > body_len ?
  3277. body_len : (int) conn->content_len;
  3278. memmove(buf, buf + discard_len, conn->data_len - discard_len);
  3279. conn->data_len -= discard_len;
  3280. conn->content_len = conn->consumed_content = 0;
  3281. } else {
  3282. if (wait_until_socket_is_readable(conn) == 0) {
  3283. break;
  3284. }
  3285. n = pull(NULL, conn, conn->buf + conn->data_len,
  3286. conn->buf_size - conn->data_len);
  3287. if (n <= 0) {
  3288. break;
  3289. }
  3290. conn->data_len += n;
  3291. }
  3292. }
  3293. }
  3294. static void handle_websocket_request(struct mg_connection *conn) {
  3295. if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
  3296. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3297. } else if (call_user(conn, MG_WEBSOCKET_CONNECT) != NULL) {
  3298. // Callback has returned non-NULL, do not proceed with handshake
  3299. } else {
  3300. send_websocket_handshake(conn);
  3301. call_user(conn, MG_WEBSOCKET_READY);
  3302. read_websocket(conn);
  3303. call_user(conn, MG_WEBSOCKET_CLOSE);
  3304. }
  3305. }
  3306. static int is_websocket_request(const struct mg_connection *conn) {
  3307. const char *host, *upgrade, *connection, *version, *key;
  3308. host = mg_get_header(conn, "Host");
  3309. upgrade = mg_get_header(conn, "Upgrade");
  3310. connection = mg_get_header(conn, "Connection");
  3311. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3312. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3313. return host != NULL && upgrade != NULL && connection != NULL &&
  3314. key != NULL && version != NULL &&
  3315. strstr(upgrade, "websocket") != NULL &&
  3316. strstr(connection, "Upgrade") != NULL;
  3317. }
  3318. #endif // !USE_WEBSOCKET
  3319. static int isbyte(int n) {
  3320. return n >= 0 && n <= 255;
  3321. }
  3322. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3323. int n, a, b, c, d, slash = 32, len = 0;
  3324. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3325. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3326. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3327. slash >= 0 && slash < 33) {
  3328. len = n;
  3329. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3330. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3331. }
  3332. return len;
  3333. }
  3334. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3335. int throttle = 0;
  3336. struct vec vec, val;
  3337. uint32_t net, mask;
  3338. char mult;
  3339. double v;
  3340. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3341. mult = ',';
  3342. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3343. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3344. continue;
  3345. }
  3346. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3347. if (vec.len == 1 && vec.ptr[0] == '*') {
  3348. throttle = (int) v;
  3349. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3350. if ((remote_ip & mask) == net) {
  3351. throttle = (int) v;
  3352. }
  3353. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3354. throttle = (int) v;
  3355. }
  3356. }
  3357. return throttle;
  3358. }
  3359. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3360. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3361. }
  3362. #ifdef USE_LUA
  3363. #ifdef _WIN32
  3364. static void *mmap(void *addr, int64_t len, int prot, int flags, int fd,
  3365. int offset) {
  3366. HANDLE fh = (HANDLE) _get_osfhandle(fd);
  3367. HANDLE mh = CreateFileMapping(fh, 0, PAGE_READONLY, 0, 0, 0);
  3368. void *p = MapViewOfFile(mh, FILE_MAP_READ, 0, 0, (size_t) len);
  3369. CloseHandle(fh);
  3370. CloseHandle(mh);
  3371. return p;
  3372. }
  3373. #define munmap(x, y) UnmapViewOfFile(x)
  3374. #define MAP_FAILED NULL
  3375. #define MAP_PRIVATE 0
  3376. #define PROT_READ 0
  3377. #else
  3378. #include <sys/mman.h>
  3379. #endif
  3380. static void lsp(struct mg_connection *conn, const char *p, int64_t len,
  3381. lua_State *L) {
  3382. int i, j, pos = 0;
  3383. for (i = 0; i < len; i++) {
  3384. if (p[i] == '<' && p[i + 1] == '?') {
  3385. for (j = i + 1; j < len ; j++) {
  3386. if (p[j] == '?' && p[j + 1] == '>') {
  3387. mg_write(conn, p + pos, i - pos);
  3388. if (luaL_loadbuffer(L, p + (i + 2), j - (i + 2), "") == LUA_OK) {
  3389. lua_pcall(L, 0, LUA_MULTRET, 0);
  3390. }
  3391. pos = j + 2;
  3392. i = pos - 1;
  3393. break;
  3394. }
  3395. }
  3396. }
  3397. }
  3398. if (i > pos) {
  3399. mg_write(conn, p + pos, i - pos);
  3400. }
  3401. }
  3402. static int lsp_mg_print(lua_State *L) {
  3403. int i, num_args;
  3404. const char *str;
  3405. size_t size;
  3406. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3407. num_args = lua_gettop(L);
  3408. for (i = 1; i <= num_args; i++) {
  3409. if (lua_isstring(L, i)) {
  3410. str = lua_tolstring(L, i, &size);
  3411. mg_write(conn, str, size);
  3412. }
  3413. }
  3414. return 0;
  3415. }
  3416. static int lsp_mg_read(lua_State *L) {
  3417. struct mg_connection *conn = lua_touserdata(L, lua_upvalueindex(1));
  3418. char buf[1024];
  3419. int len = mg_read(conn, buf, sizeof(buf));
  3420. lua_settop(L, 0);
  3421. lua_pushlstring(L, buf, len);
  3422. return 1;
  3423. }
  3424. static void reg_string(struct lua_State *L, const char *name, const char *val) {
  3425. lua_pushstring(L, name);
  3426. lua_pushstring(L, val);
  3427. lua_rawset(L, -3);
  3428. }
  3429. static void reg_int(struct lua_State *L, const char *name, int val) {
  3430. lua_pushstring(L, name);
  3431. lua_pushinteger(L, val);
  3432. lua_rawset(L, -3);
  3433. }
  3434. static void prepare_lua_environment(struct mg_connection *conn, lua_State *L) {
  3435. const struct mg_request_info *ri = mg_get_request_info(conn);
  3436. extern void luaL_openlibs(lua_State *);
  3437. int i;
  3438. luaL_openlibs(L);
  3439. // Register "print" function which calls mg_write()
  3440. lua_pushlightuserdata(L, conn);
  3441. lua_pushcclosure(L, lsp_mg_print, 1);
  3442. lua_setglobal(L, "print");
  3443. // Register mg_read()
  3444. lua_pushlightuserdata(L, conn);
  3445. lua_pushcclosure(L, lsp_mg_read, 1);
  3446. lua_setglobal(L, "read");
  3447. // Export request_info
  3448. lua_newtable(L);
  3449. reg_string(L, "request_method", ri->request_method);
  3450. reg_string(L, "uri", ri->uri);
  3451. reg_string(L, "http_version", ri->http_version);
  3452. reg_string(L, "query_string", ri->query_string);
  3453. reg_int(L, "remote_ip", ri->remote_ip);
  3454. reg_int(L, "remote_port", ri->remote_port);
  3455. reg_int(L, "num_headers", ri->num_headers);
  3456. lua_pushstring(L, "http_headers");
  3457. lua_newtable(L);
  3458. for (i = 0; i < ri->num_headers; i++) {
  3459. reg_string(L, ri->http_headers[i].name, ri->http_headers[i].value);
  3460. }
  3461. lua_rawset(L, -3);
  3462. lua_setglobal(L, "request_info");
  3463. }
  3464. static void handle_lsp_request(struct mg_connection *conn, const char *path,
  3465. struct file *filep) {
  3466. void *p = NULL;
  3467. lua_State *L = NULL;
  3468. if (!mg_fopen(conn, path, "r", filep)) {
  3469. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3470. } else if (filep->membuf == NULL &&
  3471. (p = mmap(NULL, filep->size, PROT_READ, MAP_PRIVATE,
  3472. fileno(filep->fp), 0)) == MAP_FAILED) {
  3473. send_http_error(conn, 500, http_500_error, "%s", "x");
  3474. } else if ((L = luaL_newstate()) == NULL) {
  3475. send_http_error(conn, 500, http_500_error, "%s", "y");
  3476. } else {
  3477. mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
  3478. "Content-Type: text/html\r\nConnection: close\r\n\r\n");
  3479. prepare_lua_environment(conn, L);
  3480. conn->request_info.ev_data = L;
  3481. call_user(conn, MG_INIT_LUA);
  3482. lsp(conn, filep->membuf == NULL ? p : filep->membuf, filep->size, L);
  3483. }
  3484. if (L) lua_close(L);
  3485. if (p) munmap(p, filep->size);
  3486. mg_fclose(filep);
  3487. }
  3488. #endif // USE_LUA
  3489. int mg_upload(struct mg_connection *conn, const char *destination_dir) {
  3490. const char *content_type_header, *boundary_start;
  3491. char buf[8192], path[PATH_MAX], fname[1024], boundary[100], *s;
  3492. FILE *fp;
  3493. int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;
  3494. // Request looks like this:
  3495. //
  3496. // POST /upload HTTP/1.1
  3497. // Host: 127.0.0.1:8080
  3498. // Content-Length: 244894
  3499. // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
  3500. //
  3501. // ------WebKitFormBoundaryRVr
  3502. // Content-Disposition: form-data; name="file"; filename="accum.png"
  3503. // Content-Type: image/png
  3504. //
  3505. // <89>PNG
  3506. // <PNG DATA>
  3507. // ------WebKitFormBoundaryRVr
  3508. // Extract boundary string from the Content-Type header
  3509. if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
  3510. (boundary_start = strstr(content_type_header, "boundary=")) == NULL ||
  3511. (sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
  3512. sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
  3513. boundary[0] == '\0') {
  3514. return num_uploaded_files;
  3515. }
  3516. boundary_len = strlen(boundary);
  3517. bl = boundary_len + 4; // \r\n--<boundary>
  3518. for (;;) {
  3519. // Pull in headers
  3520. assert(len >= 0 && len <= (int) sizeof(buf));
  3521. while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
  3522. len += n;
  3523. }
  3524. if ((headers_len = get_request_len(buf, len)) <= 0) {
  3525. break;
  3526. }
  3527. // Fetch file name.
  3528. fname[0] = '\0';
  3529. for (i = j = 0; i < headers_len; i++) {
  3530. if (buf[i] == '\r' && buf[i + 1] == '\n') {
  3531. buf[i] = buf[i + 1] = '\0';
  3532. // TODO(lsm): don't expect filename to be the 3rd field,
  3533. // parse the header properly instead.
  3534. sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
  3535. fname);
  3536. j = i + 2;
  3537. }
  3538. }
  3539. // Give up if the headers are not what we expect
  3540. if (fname[0] == '\0') {
  3541. break;
  3542. }
  3543. // Move data to the beginning of the buffer
  3544. assert(len >= headers_len);
  3545. memmove(buf, &buf[headers_len], len - headers_len);
  3546. len -= headers_len;
  3547. // We open the file with exclusive lock held. This guarantee us
  3548. // there is no other thread can save into the same file simultaneously.
  3549. fp = NULL;
  3550. // Construct destination file name. Do not allow paths to have slashes.
  3551. if ((s = strrchr(fname, '/')) == NULL) {
  3552. s = fname;
  3553. }
  3554. // Open file in binary mode with exclusive lock set
  3555. snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
  3556. if ((fp = fopen(path, "wbx")) == NULL) {
  3557. break;
  3558. }
  3559. // Read POST data, write into file until boundary is found.
  3560. n = 0;
  3561. do {
  3562. len += n;
  3563. for (i = 0; i < len - bl; i++) {
  3564. if (!memcmp(&buf[i], "\r\n--", 4) &&
  3565. !memcmp(&buf[i + 4], boundary, boundary_len)) {
  3566. // Found boundary, that's the end of file data.
  3567. (void) fwrite(buf, 1, i, fp);
  3568. num_uploaded_files++;
  3569. conn->request_info.ev_data = (void *) path;
  3570. call_user(conn, MG_UPLOAD);
  3571. memmove(buf, &buf[i + bl], len - (i + bl));
  3572. len -= i + bl;
  3573. break;
  3574. }
  3575. }
  3576. if (len > bl) {
  3577. fwrite(buf, 1, len - bl, fp);
  3578. memmove(buf, &buf[len - bl], len - bl);
  3579. len = bl;
  3580. }
  3581. } while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
  3582. fclose(fp);
  3583. }
  3584. return num_uploaded_files;
  3585. }
  3586. // This is the heart of the Mongoose's logic.
  3587. // This function is called when the request is read, parsed and validated,
  3588. // and Mongoose must decide what action to take: serve a file, or
  3589. // a directory, or call embedded function, etcetera.
  3590. static void handle_request(struct mg_connection *conn) {
  3591. struct mg_request_info *ri = &conn->request_info;
  3592. char path[PATH_MAX];
  3593. int uri_len;
  3594. struct file file = STRUCT_FILE_INITIALIZER;
  3595. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3596. * ((char *) conn->request_info.query_string++) = '\0';
  3597. }
  3598. uri_len = (int) strlen(ri->uri);
  3599. url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
  3600. remove_double_dots_and_double_slashes((char *) ri->uri);
  3601. convert_uri_to_file_name(conn, path, sizeof(path), &file);
  3602. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3603. get_remote_ip(conn), ri->uri);
  3604. DEBUG_TRACE(("%s", ri->uri));
  3605. if (!check_authorization(conn, path)) {
  3606. send_authorization_request(conn);
  3607. #if defined(USE_WEBSOCKET)
  3608. } else if (is_websocket_request(conn)) {
  3609. handle_websocket_request(conn);
  3610. #endif
  3611. } else if (call_user(conn, MG_NEW_REQUEST) != NULL) {
  3612. // Do nothing, callback has served the request
  3613. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3614. send_options(conn);
  3615. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3616. send_http_error(conn, 404, "Not Found", "Not Found");
  3617. } else if ((!strcmp(ri->request_method, "PUT") ||
  3618. !strcmp(ri->request_method, "DELETE")) &&
  3619. (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
  3620. is_authorized_for_put(conn) != 1)) {
  3621. send_authorization_request(conn);
  3622. } else if (!strcmp(ri->request_method, "PUT")) {
  3623. put_file(conn, path);
  3624. } else if (!strcmp(ri->request_method, "DELETE")) {
  3625. if (mg_remove(path) == 0) {
  3626. send_http_error(conn, 200, "OK", "%s", "");
  3627. } else {
  3628. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3629. strerror(ERRNO));
  3630. }
  3631. } else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
  3632. must_hide_file(conn, path)) {
  3633. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3634. } else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
  3635. mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3636. "Location: %s/\r\n\r\n", ri->uri);
  3637. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3638. handle_propfind(conn, path, &file);
  3639. } else if (file.is_directory &&
  3640. !substitute_index_file(conn, path, sizeof(path), &file)) {
  3641. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3642. handle_directory_request(conn, path);
  3643. } else {
  3644. send_http_error(conn, 403, "Directory Listing Denied",
  3645. "Directory listing denied");
  3646. }
  3647. #ifdef USE_LUA
  3648. } else if (match_prefix("**.lp$", 6, path) > 0) {
  3649. handle_lsp_request(conn, path, &file);
  3650. #endif
  3651. #if !defined(NO_CGI)
  3652. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3653. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3654. path) > 0) {
  3655. if (strcmp(ri->request_method, "POST") &&
  3656. strcmp(ri->request_method, "GET")) {
  3657. send_http_error(conn, 501, "Not Implemented",
  3658. "Method %s is not implemented", ri->request_method);
  3659. } else {
  3660. handle_cgi_request(conn, path);
  3661. }
  3662. #endif // !NO_CGI
  3663. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3664. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3665. path) > 0) {
  3666. handle_ssi_file_request(conn, path);
  3667. } else if (is_not_modified(conn, &file)) {
  3668. send_http_error(conn, 304, "Not Modified", "%s", "");
  3669. } else {
  3670. handle_file_request(conn, path, &file);
  3671. }
  3672. }
  3673. static void close_all_listening_sockets(struct mg_context *ctx) {
  3674. struct socket *sp, *tmp;
  3675. for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
  3676. tmp = sp->next;
  3677. (void) closesocket(sp->sock);
  3678. free(sp);
  3679. }
  3680. }
  3681. // Valid listening port specification is: [ip_address:]port[s]
  3682. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3683. // TODO(lsm): add parsing of the IPv6 address
  3684. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3685. int a, b, c, d, port, len;
  3686. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3687. // Also, all-zeroes in the socket address means binding to all addresses
  3688. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3689. memset(so, 0, sizeof(*so));
  3690. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  3691. // Bind to a specific IPv4 address
  3692. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3693. } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
  3694. len <= 0 ||
  3695. len > (int) vec->len ||
  3696. (vec->ptr[len] && vec->ptr[len] != 's' && vec->ptr[len] != ',')) {
  3697. return 0;
  3698. }
  3699. so->is_ssl = vec->ptr[len] == 's';
  3700. #if defined(USE_IPV6)
  3701. so->lsa.sin6.sin6_family = AF_INET6;
  3702. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3703. #else
  3704. so->lsa.sin.sin_family = AF_INET;
  3705. so->lsa.sin.sin_port = htons((uint16_t) port);
  3706. #endif
  3707. return 1;
  3708. }
  3709. static int set_ports_option(struct mg_context *ctx) {
  3710. const char *list = ctx->config[LISTENING_PORTS];
  3711. int on = 1, success = 1;
  3712. SOCKET sock;
  3713. struct vec vec;
  3714. struct socket so, *listener;
  3715. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3716. if (!parse_port_string(&vec, &so)) {
  3717. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3718. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  3719. success = 0;
  3720. } else if (so.is_ssl &&
  3721. (ctx->ssl_ctx == NULL || ctx->config[SSL_CERTIFICATE] == NULL)) {
  3722. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3723. success = 0;
  3724. } else if ((sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3725. INVALID_SOCKET ||
  3726. // On Windows, SO_REUSEADDR is recommended only for
  3727. // broadcast UDP sockets
  3728. setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char *) &on,
  3729. sizeof(on)) != 0 ||
  3730. // Set TCP keep-alive. This is needed because if HTTP-level
  3731. // keep-alive is enabled, and client resets the connection,
  3732. // server won't get TCP FIN or RST and will keep the connection
  3733. // open forever. With TCP keep-alive, next keep-alive
  3734. // handshake will figure out that the client is down and
  3735. // will close the server end.
  3736. // Thanks to Igor Klopov who suggested the patch.
  3737. setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *) &on,
  3738. sizeof(on)) != 0 ||
  3739. bind(sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
  3740. listen(sock, SOMAXCONN) != 0) {
  3741. closesocket(sock);
  3742. cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
  3743. (int) vec.len, vec.ptr, strerror(ERRNO));
  3744. success = 0;
  3745. } else if ((listener = (struct socket *)
  3746. calloc(1, sizeof(*listener))) == NULL) {
  3747. // NOTE(lsm): order is important: call cry before closesocket(),
  3748. // cause closesocket() alters the errno.
  3749. cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO));
  3750. closesocket(sock);
  3751. success = 0;
  3752. } else {
  3753. *listener = so;
  3754. listener->sock = sock;
  3755. set_close_on_exec(listener->sock);
  3756. listener->next = ctx->listening_sockets;
  3757. ctx->listening_sockets = listener;
  3758. }
  3759. }
  3760. if (!success) {
  3761. close_all_listening_sockets(ctx);
  3762. }
  3763. return success;
  3764. }
  3765. static void log_header(const struct mg_connection *conn, const char *header,
  3766. FILE *fp) {
  3767. const char *header_value;
  3768. if ((header_value = mg_get_header(conn, header)) == NULL) {
  3769. (void) fprintf(fp, "%s", " -");
  3770. } else {
  3771. (void) fprintf(fp, " \"%s\"", header_value);
  3772. }
  3773. }
  3774. static void log_access(const struct mg_connection *conn) {
  3775. const struct mg_request_info *ri;
  3776. FILE *fp;
  3777. char date[64], src_addr[20];
  3778. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  3779. fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  3780. if (fp == NULL)
  3781. return;
  3782. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3783. localtime(&conn->birth_time));
  3784. ri = &conn->request_info;
  3785. flockfile(fp);
  3786. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  3787. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3788. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  3789. ri->request_method ? ri->request_method : "-",
  3790. ri->uri ? ri->uri : "-", ri->http_version,
  3791. conn->status_code, conn->num_bytes_sent);
  3792. log_header(conn, "Referer", fp);
  3793. log_header(conn, "User-Agent", fp);
  3794. fputc('\n', fp);
  3795. fflush(fp);
  3796. funlockfile(fp);
  3797. fclose(fp);
  3798. }
  3799. // Verify given socket address against the ACL.
  3800. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  3801. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  3802. int allowed, flag;
  3803. uint32_t net, mask;
  3804. struct vec vec;
  3805. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  3806. // If any ACL is set, deny by default
  3807. allowed = list == NULL ? '+' : '-';
  3808. while ((list = next_option(list, &vec, NULL)) != NULL) {
  3809. flag = vec.ptr[0];
  3810. if ((flag != '+' && flag != '-') ||
  3811. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  3812. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  3813. return -1;
  3814. }
  3815. if (net == (remote_ip & mask)) {
  3816. allowed = flag;
  3817. }
  3818. }
  3819. return allowed == '+';
  3820. }
  3821. static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) {
  3822. FD_SET(fd, set);
  3823. if (fd > (SOCKET) *max_fd) {
  3824. *max_fd = (int) fd;
  3825. }
  3826. }
  3827. #if !defined(_WIN32)
  3828. static int set_uid_option(struct mg_context *ctx) {
  3829. struct passwd *pw;
  3830. const char *uid = ctx->config[RUN_AS_USER];
  3831. int success = 0;
  3832. if (uid == NULL) {
  3833. success = 1;
  3834. } else {
  3835. if ((pw = getpwnam(uid)) == NULL) {
  3836. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  3837. } else if (setgid(pw->pw_gid) == -1) {
  3838. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  3839. } else if (setuid(pw->pw_uid) == -1) {
  3840. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  3841. } else {
  3842. success = 1;
  3843. }
  3844. }
  3845. return success;
  3846. }
  3847. #endif // !_WIN32
  3848. #if !defined(NO_SSL)
  3849. static pthread_mutex_t *ssl_mutexes;
  3850. // Return OpenSSL error message
  3851. static const char *ssl_error(void) {
  3852. unsigned long err;
  3853. err = ERR_get_error();
  3854. return err == 0 ? "" : ERR_error_string(err, NULL);
  3855. }
  3856. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  3857. int line) {
  3858. line = 0; // Unused
  3859. file = NULL; // Unused
  3860. if (mode & CRYPTO_LOCK) {
  3861. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  3862. } else {
  3863. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  3864. }
  3865. }
  3866. static unsigned long ssl_id_callback(void) {
  3867. return (unsigned long) pthread_self();
  3868. }
  3869. #if !defined(NO_SSL_DL)
  3870. static int load_dll(struct mg_context *ctx, const char *dll_name,
  3871. struct ssl_func *sw) {
  3872. union {void *p; void (*fp)(void);} u;
  3873. void *dll_handle;
  3874. struct ssl_func *fp;
  3875. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  3876. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  3877. return 0;
  3878. }
  3879. for (fp = sw; fp->name != NULL; fp++) {
  3880. #ifdef _WIN32
  3881. // GetProcAddress() returns pointer to function
  3882. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  3883. #else
  3884. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  3885. // function pointers. We need to use a union to make a cast.
  3886. u.p = dlsym(dll_handle, fp->name);
  3887. #endif // _WIN32
  3888. if (u.fp == NULL) {
  3889. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  3890. return 0;
  3891. } else {
  3892. fp->ptr = u.fp;
  3893. }
  3894. }
  3895. return 1;
  3896. }
  3897. #endif // NO_SSL_DL
  3898. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  3899. static int set_ssl_option(struct mg_context *ctx) {
  3900. struct mg_connection *conn;
  3901. int i, size;
  3902. const char *pem;
  3903. // If PEM file is not specified, skip SSL initialization.
  3904. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
  3905. return 1;
  3906. }
  3907. #if !defined(NO_SSL_DL)
  3908. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  3909. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  3910. return 0;
  3911. }
  3912. #endif // NO_SSL_DL
  3913. // Initialize SSL crap
  3914. SSL_library_init();
  3915. SSL_load_error_strings();
  3916. if ((ctx->client_ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) {
  3917. cry(fc(ctx), "SSL_CTX_new (client) error: %s", ssl_error());
  3918. }
  3919. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  3920. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  3921. return 0;
  3922. }
  3923. // If user callback returned non-NULL, that means that user callback has
  3924. // set up certificate itself. In this case, skip sertificate setting.
  3925. conn = fc(ctx);
  3926. conn->request_info.ev_data = ctx->ssl_ctx;
  3927. if (call_user(conn, MG_INIT_SSL) == NULL &&
  3928. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0 ||
  3929. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0)) {
  3930. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  3931. return 0;
  3932. }
  3933. if (pem != NULL) {
  3934. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  3935. }
  3936. // Initialize locking callbacks, needed for thread safety.
  3937. // http://www.openssl.org/support/faq.html#PROG1
  3938. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  3939. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  3940. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  3941. return 0;
  3942. }
  3943. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3944. pthread_mutex_init(&ssl_mutexes[i], NULL);
  3945. }
  3946. CRYPTO_set_locking_callback(&ssl_locking_callback);
  3947. CRYPTO_set_id_callback(&ssl_id_callback);
  3948. return 1;
  3949. }
  3950. static void uninitialize_ssl(struct mg_context *ctx) {
  3951. int i;
  3952. if (ctx->ssl_ctx != NULL) {
  3953. CRYPTO_set_locking_callback(NULL);
  3954. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3955. pthread_mutex_destroy(&ssl_mutexes[i]);
  3956. }
  3957. CRYPTO_set_locking_callback(NULL);
  3958. CRYPTO_set_id_callback(NULL);
  3959. }
  3960. }
  3961. #endif // !NO_SSL
  3962. static int set_gpass_option(struct mg_context *ctx) {
  3963. struct file file;
  3964. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  3965. if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
  3966. cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
  3967. return 0;
  3968. }
  3969. return 1;
  3970. }
  3971. static int set_acl_option(struct mg_context *ctx) {
  3972. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  3973. }
  3974. static void reset_per_request_attributes(struct mg_connection *conn) {
  3975. conn->path_info = conn->request_info.ev_data = NULL;
  3976. conn->num_bytes_sent = conn->consumed_content = 0;
  3977. conn->status_code = -1;
  3978. conn->must_close = conn->request_len = conn->throttle = 0;
  3979. }
  3980. static void close_socket_gracefully(struct mg_connection *conn) {
  3981. char buf[MG_BUF_LEN];
  3982. struct linger linger;
  3983. int n, sock = conn->client.sock;
  3984. // Set linger option to avoid socket hanging out after close. This prevent
  3985. // ephemeral port exhaust problem under high QPS.
  3986. linger.l_onoff = 1;
  3987. linger.l_linger = 1;
  3988. setsockopt(sock, SOL_SOCKET, SO_LINGER, (char *) &linger, sizeof(linger));
  3989. // Send FIN to the client
  3990. (void) shutdown(sock, SHUT_WR);
  3991. set_non_blocking_mode(sock);
  3992. // Read and discard pending incoming data. If we do not do that and close the
  3993. // socket, the data in the send buffer may be discarded. This
  3994. // behaviour is seen on Windows, when client keeps sending data
  3995. // when server decides to close the connection; then when client
  3996. // does recv() it gets no data back.
  3997. do {
  3998. n = pull(NULL, conn, buf, sizeof(buf));
  3999. } while (n > 0);
  4000. // Now we know that our FIN is ACK-ed, safe to close
  4001. (void) closesocket(sock);
  4002. }
  4003. static void close_connection(struct mg_connection *conn) {
  4004. conn->must_close = 1;
  4005. if (conn->ssl) {
  4006. SSL_free(conn->ssl);
  4007. conn->ssl = NULL;
  4008. }
  4009. if (conn->client.sock != INVALID_SOCKET) {
  4010. close_socket_gracefully(conn);
  4011. }
  4012. }
  4013. void mg_close_connection(struct mg_connection *conn) {
  4014. close_connection(conn);
  4015. free(conn);
  4016. }
  4017. struct mg_connection *mg_connect(struct mg_context *ctx,
  4018. const char *host, int port, int use_ssl) {
  4019. struct mg_connection *newconn = NULL;
  4020. struct sockaddr_in sin;
  4021. struct hostent *he;
  4022. int sock;
  4023. if (use_ssl && (ctx == NULL || ctx->client_ssl_ctx == NULL)) {
  4024. cry(fc(ctx), "%s: SSL is not initialized", __func__);
  4025. } else if ((he = gethostbyname(host)) == NULL) {
  4026. cry(fc(ctx), "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
  4027. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  4028. cry(fc(ctx), "%s: socket: %s", __func__, strerror(ERRNO));
  4029. } else {
  4030. sin.sin_family = AF_INET;
  4031. sin.sin_port = htons((uint16_t) port);
  4032. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  4033. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  4034. cry(fc(ctx), "%s: connect(%s:%d): %s", __func__, host, port,
  4035. strerror(ERRNO));
  4036. closesocket(sock);
  4037. } else if ((newconn = (struct mg_connection *)
  4038. calloc(1, sizeof(*newconn))) == NULL) {
  4039. cry(fc(ctx), "%s: calloc: %s", __func__, strerror(ERRNO));
  4040. closesocket(sock);
  4041. } else {
  4042. newconn->ctx = ctx;
  4043. newconn->client.sock = sock;
  4044. newconn->client.rsa.sin = sin;
  4045. newconn->client.is_ssl = use_ssl;
  4046. if (use_ssl) {
  4047. sslize(newconn, ctx->client_ssl_ctx, SSL_connect);
  4048. }
  4049. }
  4050. }
  4051. return newconn;
  4052. }
  4053. FILE *mg_fetch(struct mg_context *ctx, const char *url, const char *path,
  4054. char *buf, size_t buf_len, struct mg_request_info *ri) {
  4055. struct mg_connection *newconn;
  4056. int n, req_length, data_length, port;
  4057. char host[1025], proto[10], buf2[MG_BUF_LEN];
  4058. FILE *fp = NULL;
  4059. if (sscanf(url, "%9[htps]://%1024[^:]:%d/%n", proto, host, &port, &n) == 3) {
  4060. } else if (sscanf(url, "%9[htps]://%1024[^/]/%n", proto, host, &n) == 2) {
  4061. port = mg_strcasecmp(proto, "https") == 0 ? 443 : 80;
  4062. } else {
  4063. cry(fc(ctx), "%s: invalid URL: [%s]", __func__, url);
  4064. return NULL;
  4065. }
  4066. if ((newconn = mg_connect(ctx, host, port,
  4067. !strcmp(proto, "https"))) == NULL) {
  4068. cry(fc(ctx), "%s: mg_connect(%s): %s", __func__, url, strerror(ERRNO));
  4069. } else {
  4070. mg_printf(newconn, "GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n", url + n, host);
  4071. data_length = 0;
  4072. req_length = read_request(NULL, newconn, buf, buf_len, &data_length);
  4073. if (req_length <= 0) {
  4074. cry(fc(ctx), "%s(%s): invalid HTTP reply", __func__, url);
  4075. } else if (parse_http_response(buf, req_length, ri) <= 0) {
  4076. cry(fc(ctx), "%s(%s): cannot parse HTTP headers", __func__, url);
  4077. } else if ((fp = fopen(path, "w+b")) == NULL) {
  4078. cry(fc(ctx), "%s: fopen(%s): %s", __func__, path, strerror(ERRNO));
  4079. } else {
  4080. // Write chunk of data that may be in the user's buffer
  4081. data_length -= req_length;
  4082. if (data_length > 0 &&
  4083. fwrite(buf + req_length, 1, data_length, fp) != (size_t) data_length) {
  4084. cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO));
  4085. fclose(fp);
  4086. fp = NULL;
  4087. }
  4088. // Read the rest of the response and write it to the file. Do not use
  4089. // mg_read() cause we didn't set newconn->content_len properly.
  4090. while (fp && (data_length = pull(0, newconn, buf2, sizeof(buf2))) > 0) {
  4091. if (fwrite(buf2, 1, data_length, fp) != (size_t) data_length) {
  4092. cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO));
  4093. fclose(fp);
  4094. fp = NULL;
  4095. break;
  4096. }
  4097. }
  4098. }
  4099. mg_close_connection(newconn);
  4100. }
  4101. return fp;
  4102. }
  4103. static int is_valid_uri(const char *uri) {
  4104. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  4105. // URI can be an asterisk (*) or should start with slash.
  4106. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  4107. }
  4108. static void process_new_connection(struct mg_connection *conn) {
  4109. struct mg_request_info *ri = &conn->request_info;
  4110. int keep_alive_enabled, discard_len;
  4111. const char *cl;
  4112. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  4113. // Important: on new connection, reset the receiving buffer. Credit goes
  4114. // to crule42.
  4115. conn->data_len = 0;
  4116. do {
  4117. reset_per_request_attributes(conn);
  4118. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  4119. &conn->data_len);
  4120. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  4121. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  4122. send_http_error(conn, 413, "Request Too Large", "%s", "");
  4123. return;
  4124. } if (conn->request_len <= 0) {
  4125. return; // Remote end closed the connection
  4126. }
  4127. if (parse_http_request(conn->buf, conn->buf_size, ri) <= 0 ||
  4128. !is_valid_uri(ri->uri)) {
  4129. // Do not put garbage in the access log, just send it back to the client
  4130. send_http_error(conn, 400, "Bad Request",
  4131. "Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf);
  4132. conn->must_close = 1;
  4133. } else if (strcmp(ri->http_version, "1.0") &&
  4134. strcmp(ri->http_version, "1.1")) {
  4135. // Request seems valid, but HTTP version is strange
  4136. send_http_error(conn, 505, "HTTP version not supported", "%s", "");
  4137. log_access(conn);
  4138. } else {
  4139. // Request is valid, handle it
  4140. if ((cl = get_header(ri, "Content-Length")) != NULL) {
  4141. conn->content_len = strtoll(cl, NULL, 10);
  4142. } else if (!mg_strcasecmp(ri->request_method, "POST") ||
  4143. !mg_strcasecmp(ri->request_method, "PUT")) {
  4144. conn->content_len = -1;
  4145. } else {
  4146. conn->content_len = 0;
  4147. }
  4148. conn->birth_time = time(NULL);
  4149. handle_request(conn);
  4150. call_user(conn, MG_REQUEST_COMPLETE);
  4151. log_access(conn);
  4152. }
  4153. if (ri->remote_user != NULL) {
  4154. free((void *) ri->remote_user);
  4155. }
  4156. // Discard all buffered data for this request
  4157. discard_len = conn->content_len >= 0 &&
  4158. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  4159. (int) (conn->request_len + conn->content_len) : conn->data_len;
  4160. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  4161. conn->data_len -= discard_len;
  4162. assert(conn->data_len >= 0);
  4163. assert(conn->data_len <= conn->buf_size);
  4164. } while (conn->ctx->stop_flag == 0 &&
  4165. keep_alive_enabled &&
  4166. conn->content_len >= 0 &&
  4167. should_keep_alive(conn));
  4168. }
  4169. // Worker threads take accepted socket from the queue
  4170. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  4171. (void) pthread_mutex_lock(&ctx->mutex);
  4172. DEBUG_TRACE(("going idle"));
  4173. // If the queue is empty, wait. We're idle at this point.
  4174. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  4175. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  4176. }
  4177. // If we're stopping, sq_head may be equal to sq_tail.
  4178. if (ctx->sq_head > ctx->sq_tail) {
  4179. // Copy socket from the queue and increment tail
  4180. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  4181. ctx->sq_tail++;
  4182. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  4183. // Wrap pointers if needed
  4184. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  4185. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  4186. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  4187. }
  4188. }
  4189. (void) pthread_cond_signal(&ctx->sq_empty);
  4190. (void) pthread_mutex_unlock(&ctx->mutex);
  4191. return !ctx->stop_flag;
  4192. }
  4193. static void worker_thread(struct mg_context *ctx) {
  4194. struct mg_connection *conn;
  4195. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  4196. if (conn == NULL) {
  4197. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  4198. } else {
  4199. conn->buf_size = MAX_REQUEST_SIZE;
  4200. conn->buf = (char *) (conn + 1);
  4201. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  4202. // sq_empty condvar to wake up the master waiting in produce_socket()
  4203. while (consume_socket(ctx, &conn->client)) {
  4204. conn->birth_time = time(NULL);
  4205. conn->ctx = ctx;
  4206. // Fill in IP, port info early so even if SSL setup below fails,
  4207. // error handler would have the corresponding info.
  4208. // Thanks to Johannes Winkelmann for the patch.
  4209. // TODO(lsm): Fix IPv6 case
  4210. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  4211. memcpy(&conn->request_info.remote_ip,
  4212. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  4213. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  4214. conn->request_info.is_ssl = conn->client.is_ssl;
  4215. if (!conn->client.is_ssl ||
  4216. (conn->client.is_ssl &&
  4217. sslize(conn, conn->ctx->ssl_ctx, SSL_accept))) {
  4218. process_new_connection(conn);
  4219. }
  4220. close_connection(conn);
  4221. }
  4222. free(conn);
  4223. }
  4224. // Signal master that we're done with connection and exiting
  4225. (void) pthread_mutex_lock(&ctx->mutex);
  4226. ctx->num_threads--;
  4227. (void) pthread_cond_signal(&ctx->cond);
  4228. assert(ctx->num_threads >= 0);
  4229. (void) pthread_mutex_unlock(&ctx->mutex);
  4230. DEBUG_TRACE(("exiting"));
  4231. }
  4232. // Master thread adds accepted socket to a queue
  4233. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  4234. (void) pthread_mutex_lock(&ctx->mutex);
  4235. // If the queue is full, wait
  4236. while (ctx->stop_flag == 0 &&
  4237. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  4238. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  4239. }
  4240. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  4241. // Copy socket to the queue and increment head
  4242. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  4243. ctx->sq_head++;
  4244. DEBUG_TRACE(("queued socket %d", sp->sock));
  4245. }
  4246. (void) pthread_cond_signal(&ctx->sq_full);
  4247. (void) pthread_mutex_unlock(&ctx->mutex);
  4248. }
  4249. static void accept_new_connection(const struct socket *listener,
  4250. struct mg_context *ctx) {
  4251. struct socket accepted;
  4252. char src_addr[20];
  4253. socklen_t len;
  4254. int allowed;
  4255. len = sizeof(accepted.rsa);
  4256. accepted.lsa = listener->lsa;
  4257. accepted.sock = accept(listener->sock, &accepted.rsa.sa, &len);
  4258. if (accepted.sock != INVALID_SOCKET) {
  4259. allowed = check_acl(ctx, ntohl(* (uint32_t *) &accepted.rsa.sin.sin_addr));
  4260. if (allowed) {
  4261. // Put accepted socket structure into the queue
  4262. DEBUG_TRACE(("accepted socket %d", accepted.sock));
  4263. accepted.is_ssl = listener->is_ssl;
  4264. produce_socket(ctx, &accepted);
  4265. } else {
  4266. sockaddr_to_string(src_addr, sizeof(src_addr), &accepted.rsa);
  4267. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  4268. (void) closesocket(accepted.sock);
  4269. }
  4270. }
  4271. }
  4272. static void master_thread(struct mg_context *ctx) {
  4273. fd_set read_set;
  4274. struct timeval tv;
  4275. struct socket *sp;
  4276. int max_fd;
  4277. // Increase priority of the master thread
  4278. #if defined(_WIN32)
  4279. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  4280. #endif
  4281. #if defined(ISSUE_317)
  4282. struct sched_param sched_param;
  4283. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  4284. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  4285. #endif
  4286. while (ctx->stop_flag == 0) {
  4287. FD_ZERO(&read_set);
  4288. max_fd = -1;
  4289. // Add listening sockets to the read set
  4290. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  4291. add_to_set(sp->sock, &read_set, &max_fd);
  4292. }
  4293. tv.tv_sec = 0;
  4294. tv.tv_usec = 200 * 1000;
  4295. if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
  4296. #ifdef _WIN32
  4297. // On windows, if read_set and write_set are empty,
  4298. // select() returns "Invalid parameter" error
  4299. // (at least on my Windows XP Pro). So in this case, we sleep here.
  4300. mg_sleep(1000);
  4301. #endif // _WIN32
  4302. } else {
  4303. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  4304. if (ctx->stop_flag == 0 && FD_ISSET(sp->sock, &read_set)) {
  4305. accept_new_connection(sp, ctx);
  4306. }
  4307. }
  4308. }
  4309. }
  4310. DEBUG_TRACE(("stopping workers"));
  4311. // Stop signal received: somebody called mg_stop. Quit.
  4312. close_all_listening_sockets(ctx);
  4313. // Wakeup workers that are waiting for connections to handle.
  4314. pthread_cond_broadcast(&ctx->sq_full);
  4315. // Wait until all threads finish
  4316. (void) pthread_mutex_lock(&ctx->mutex);
  4317. while (ctx->num_threads > 0) {
  4318. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4319. }
  4320. (void) pthread_mutex_unlock(&ctx->mutex);
  4321. // All threads exited, no sync is needed. Destroy mutex and condvars
  4322. (void) pthread_mutex_destroy(&ctx->mutex);
  4323. (void) pthread_cond_destroy(&ctx->cond);
  4324. (void) pthread_cond_destroy(&ctx->sq_empty);
  4325. (void) pthread_cond_destroy(&ctx->sq_full);
  4326. #if !defined(NO_SSL)
  4327. uninitialize_ssl(ctx);
  4328. #endif
  4329. DEBUG_TRACE(("exiting"));
  4330. // Signal mg_stop() that we're done.
  4331. // WARNING: This must be the very last thing this
  4332. // thread does, as ctx becomes invalid after this line.
  4333. ctx->stop_flag = 2;
  4334. }
  4335. static void free_context(struct mg_context *ctx) {
  4336. int i;
  4337. // Deallocate config parameters
  4338. for (i = 0; i < NUM_OPTIONS; i++) {
  4339. if (ctx->config[i] != NULL)
  4340. free(ctx->config[i]);
  4341. }
  4342. // Deallocate SSL context
  4343. if (ctx->ssl_ctx != NULL) {
  4344. SSL_CTX_free(ctx->ssl_ctx);
  4345. }
  4346. if (ctx->client_ssl_ctx != NULL) {
  4347. SSL_CTX_free(ctx->client_ssl_ctx);
  4348. }
  4349. #ifndef NO_SSL
  4350. if (ssl_mutexes != NULL) {
  4351. free(ssl_mutexes);
  4352. ssl_mutexes = NULL;
  4353. }
  4354. #endif // !NO_SSL
  4355. // Deallocate context itself
  4356. free(ctx);
  4357. }
  4358. void mg_stop(struct mg_context *ctx) {
  4359. ctx->stop_flag = 1;
  4360. // Wait until mg_fini() stops
  4361. while (ctx->stop_flag != 2) {
  4362. (void) mg_sleep(10);
  4363. }
  4364. free_context(ctx);
  4365. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4366. (void) WSACleanup();
  4367. #endif // _WIN32
  4368. }
  4369. struct mg_context *mg_start(mg_callback_t user_callback, void *user_data,
  4370. const char **options) {
  4371. struct mg_context *ctx;
  4372. const char *name, *value, *default_value;
  4373. int i;
  4374. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4375. WSADATA data;
  4376. WSAStartup(MAKEWORD(2,2), &data);
  4377. InitializeCriticalSection(&global_log_file_lock);
  4378. #endif // _WIN32
  4379. // Allocate context and initialize reasonable general case defaults.
  4380. // TODO(lsm): do proper error handling here.
  4381. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4382. return NULL;
  4383. }
  4384. ctx->user_callback = user_callback;
  4385. ctx->user_data = user_data;
  4386. while (options && (name = *options++) != NULL) {
  4387. if ((i = get_option_index(name)) == -1) {
  4388. cry(fc(ctx), "Invalid option: %s", name);
  4389. free_context(ctx);
  4390. return NULL;
  4391. } else if ((value = *options++) == NULL) {
  4392. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4393. free_context(ctx);
  4394. return NULL;
  4395. }
  4396. if (ctx->config[i] != NULL) {
  4397. cry(fc(ctx), "warning: %s: duplicate option", name);
  4398. free(ctx->config[i]);
  4399. }
  4400. ctx->config[i] = mg_strdup(value);
  4401. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4402. }
  4403. // Set default value if needed
  4404. for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
  4405. default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
  4406. if (ctx->config[i] == NULL && default_value != NULL) {
  4407. ctx->config[i] = mg_strdup(default_value);
  4408. DEBUG_TRACE(("Setting default: [%s] -> [%s]",
  4409. config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
  4410. default_value));
  4411. }
  4412. }
  4413. // NOTE(lsm): order is important here. SSL certificates must
  4414. // be initialized before listening ports. UID must be set last.
  4415. if (!set_gpass_option(ctx) ||
  4416. #if !defined(NO_SSL)
  4417. !set_ssl_option(ctx) ||
  4418. #endif
  4419. !set_ports_option(ctx) ||
  4420. #if !defined(_WIN32)
  4421. !set_uid_option(ctx) ||
  4422. #endif
  4423. !set_acl_option(ctx)) {
  4424. free_context(ctx);
  4425. return NULL;
  4426. }
  4427. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4428. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4429. // won't kill the whole process.
  4430. (void) signal(SIGPIPE, SIG_IGN);
  4431. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4432. (void) signal(SIGCHLD, SIG_IGN);
  4433. #endif // !_WIN32
  4434. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4435. (void) pthread_cond_init(&ctx->cond, NULL);
  4436. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4437. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4438. // Start master (listening) thread
  4439. mg_start_thread((mg_thread_func_t) master_thread, ctx);
  4440. // Start worker threads
  4441. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4442. if (mg_start_thread((mg_thread_func_t) worker_thread, ctx) != 0) {
  4443. cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
  4444. } else {
  4445. ctx->num_threads++;
  4446. }
  4447. }
  4448. return ctx;
  4449. }