mongoose.c 153 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. #ifdef WIN32_LEAN_AND_MEAN
  31. #undef WIN32_LEAN_AND_MEAN // Disable WIN32_LEAN_AND_MEAN, if necessary
  32. #endif
  33. #if defined(__SYMBIAN32__)
  34. #define NO_SSL // SSL is not supported
  35. #define NO_CGI // CGI is not supported
  36. #define PATH_MAX FILENAME_MAX
  37. #endif // __SYMBIAN32__
  38. #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
  39. #include <sys/types.h>
  40. #include <sys/stat.h>
  41. #include <errno.h>
  42. #include <signal.h>
  43. #include <fcntl.h>
  44. #endif // !_WIN32_WCE
  45. #include <time.h>
  46. #include <stdlib.h>
  47. #include <stdarg.h>
  48. #include <assert.h>
  49. #include <string.h>
  50. #include <ctype.h>
  51. #include <limits.h>
  52. #include <stddef.h>
  53. #include <stdio.h>
  54. #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
  55. #define _WIN32_WINNT 0x0400 // To make it link in VS2005
  56. #include <windows.h>
  57. #include <winsock2.h>
  58. #include <ws2tcpip.h>
  59. #ifndef PATH_MAX
  60. #define PATH_MAX MAX_PATH
  61. #endif
  62. #ifndef _WIN32_WCE
  63. #include <process.h>
  64. #include <direct.h>
  65. #include <io.h>
  66. #else // _WIN32_WCE
  67. #define NO_CGI // WinCE has no pipes
  68. typedef long off_t;
  69. #define errno GetLastError()
  70. #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
  71. #endif // _WIN32_WCE
  72. #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
  73. ((uint64_t)((uint32_t)(hi))) << 32))
  74. #define RATE_DIFF 10000000 // 100 nsecs
  75. #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
  76. #define SYS2UNIX_TIME(lo, hi) \
  77. (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
  78. // Visual Studio 6 does not know __func__ or __FUNCTION__
  79. // The rest of MS compilers use __FUNCTION__, not C99 __func__
  80. // Also use _strtoui64 on modern M$ compilers
  81. #if defined(_MSC_VER) && _MSC_VER < 1300
  82. #define STRX(x) #x
  83. #define STR(x) STRX(x)
  84. #define __func__ "line " STR(__LINE__)
  85. #define strtoull(x, y, z) strtoul(x, y, z)
  86. #define strtoll(x, y, z) strtol(x, y, z)
  87. #else
  88. #define __func__ __FUNCTION__
  89. #define strtoull(x, y, z) _strtoui64(x, y, z)
  90. #define strtoll(x, y, z) _strtoi64(x, y, z)
  91. #endif // _MSC_VER
  92. #define ERRNO GetLastError()
  93. #define NO_SOCKLEN_T
  94. #define SSL_LIB "ssleay32.dll"
  95. #define CRYPTO_LIB "libeay32.dll"
  96. #define O_NONBLOCK 0
  97. #if !defined(EWOULDBLOCK)
  98. #define EWOULDBLOCK WSAEWOULDBLOCK
  99. #endif // !EWOULDBLOCK
  100. #define _POSIX_
  101. #define INT64_FMT "I64d"
  102. #define WINCDECL __cdecl
  103. #define SHUT_WR 1
  104. #define snprintf _snprintf
  105. #define vsnprintf _vsnprintf
  106. #define mg_sleep(x) Sleep(x)
  107. #define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
  108. #define popen(x, y) _popen(x, y)
  109. #define pclose(x) _pclose(x)
  110. #define close(x) _close(x)
  111. #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
  112. #define RTLD_LAZY 0
  113. #define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
  114. #define fdopen(x, y) _fdopen((x), (y))
  115. #define write(x, y, z) _write((x), (y), (unsigned) z)
  116. #define read(x, y, z) _read((x), (y), (unsigned) z)
  117. #define flockfile(x) EnterCriticalSection(&global_log_file_lock)
  118. #define funlockfile(x) LeaveCriticalSection(&global_log_file_lock)
  119. #define sleep(x) Sleep((x) * 1000)
  120. #if !defined(fileno)
  121. #define fileno(x) _fileno(x)
  122. #endif // !fileno MINGW #defines fileno
  123. typedef HANDLE pthread_mutex_t;
  124. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  125. typedef DWORD pthread_t;
  126. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  127. static int pthread_mutex_lock(pthread_mutex_t *);
  128. static int pthread_mutex_unlock(pthread_mutex_t *);
  129. static FILE *mg_fopen(const char *path, const char *mode);
  130. #if defined(HAVE_STDINT)
  131. #include <stdint.h>
  132. #else
  133. typedef unsigned int uint32_t;
  134. typedef unsigned short uint16_t;
  135. typedef unsigned __int64 uint64_t;
  136. typedef __int64 int64_t;
  137. #define INT64_MAX 9223372036854775807
  138. #endif // HAVE_STDINT
  139. // POSIX dirent interface
  140. struct dirent {
  141. char d_name[PATH_MAX];
  142. };
  143. typedef struct DIR {
  144. HANDLE handle;
  145. WIN32_FIND_DATAW info;
  146. struct dirent result;
  147. } DIR;
  148. // Mark required libraries
  149. #pragma comment(lib, "Ws2_32.lib")
  150. #else // UNIX specific
  151. #include <sys/wait.h>
  152. #include <sys/socket.h>
  153. #include <sys/select.h>
  154. #include <netinet/in.h>
  155. #include <arpa/inet.h>
  156. #include <sys/time.h>
  157. #include <stdint.h>
  158. #include <inttypes.h>
  159. #include <netdb.h>
  160. #include <pwd.h>
  161. #include <unistd.h>
  162. #include <dirent.h>
  163. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  164. #include <dlfcn.h>
  165. #endif
  166. #include <pthread.h>
  167. #if defined(__MACH__)
  168. #define SSL_LIB "libssl.dylib"
  169. #define CRYPTO_LIB "libcrypto.dylib"
  170. #else
  171. #if !defined(SSL_LIB)
  172. #define SSL_LIB "libssl.so"
  173. #endif
  174. #if !defined(CRYPTO_LIB)
  175. #define CRYPTO_LIB "libcrypto.so"
  176. #endif
  177. #endif
  178. #ifndef O_BINARY
  179. #define O_BINARY 0
  180. #endif // O_BINARY
  181. #define closesocket(a) close(a)
  182. #define mg_fopen(x, y) fopen(x, y)
  183. #define mg_mkdir(x, y) mkdir(x, y)
  184. #define mg_remove(x) remove(x)
  185. #define mg_rename(x, y) rename(x, y)
  186. #define mg_sleep(x) usleep((x) * 1000)
  187. #define ERRNO errno
  188. #define INVALID_SOCKET (-1)
  189. #define INT64_FMT PRId64
  190. typedef int SOCKET;
  191. #define WINCDECL
  192. #endif // End of Windows and UNIX specific includes
  193. #include "mongoose.h"
  194. #define MONGOOSE_VERSION "3.3"
  195. #define PASSWORDS_FILE_NAME ".htpasswd"
  196. #define CGI_ENVIRONMENT_SIZE 4096
  197. #define MAX_CGI_ENVIR_VARS 64
  198. #define MG_BUF_LEN 8192
  199. #define MAX_REQUEST_SIZE 16384
  200. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  201. #ifdef _WIN32
  202. static CRITICAL_SECTION global_log_file_lock;
  203. static pthread_t pthread_self(void) {
  204. return GetCurrentThreadId();
  205. }
  206. #endif // _WIN32
  207. #ifdef DEBUG_TRACE
  208. #undef DEBUG_TRACE
  209. #define DEBUG_TRACE(x)
  210. #else
  211. #if defined(DEBUG)
  212. #define DEBUG_TRACE(x) do { \
  213. flockfile(stdout); \
  214. printf("*** %lu.%p.%s.%d: ", \
  215. (unsigned long) time(NULL), (void *) pthread_self(), \
  216. __func__, __LINE__); \
  217. printf x; \
  218. putchar('\n'); \
  219. fflush(stdout); \
  220. funlockfile(stdout); \
  221. } while (0)
  222. #else
  223. #define DEBUG_TRACE(x)
  224. #endif // DEBUG
  225. #endif // DEBUG_TRACE
  226. // Darwin prior to 7.0 and Win32 do not have socklen_t
  227. #ifdef NO_SOCKLEN_T
  228. typedef int socklen_t;
  229. #endif // NO_SOCKLEN_T
  230. #define _DARWIN_UNLIMITED_SELECT
  231. #if !defined(MSG_NOSIGNAL)
  232. #define MSG_NOSIGNAL 0
  233. #endif
  234. #if !defined(SOMAXCONN)
  235. #define SOMAXCONN 100
  236. #endif
  237. #if !defined(PATH_MAX)
  238. #define PATH_MAX 4096
  239. #endif
  240. static const char *http_500_error = "Internal Server Error";
  241. // Snatched from OpenSSL includes. I put the prototypes here to be independent
  242. // from the OpenSSL source installation. Having this, mongoose + SSL can be
  243. // built on any system with binary SSL libraries installed.
  244. typedef struct ssl_st SSL;
  245. typedef struct ssl_method_st SSL_METHOD;
  246. typedef struct ssl_ctx_st SSL_CTX;
  247. #define SSL_ERROR_WANT_READ 2
  248. #define SSL_ERROR_WANT_WRITE 3
  249. #define SSL_FILETYPE_PEM 1
  250. #define CRYPTO_LOCK 1
  251. #if defined(NO_SSL_DL)
  252. extern void SSL_free(SSL *);
  253. extern int SSL_accept(SSL *);
  254. extern int SSL_connect(SSL *);
  255. extern int SSL_read(SSL *, void *, int);
  256. extern int SSL_write(SSL *, const void *, int);
  257. extern int SSL_get_error(const SSL *, int);
  258. extern int SSL_set_fd(SSL *, int);
  259. extern SSL *SSL_new(SSL_CTX *);
  260. extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
  261. extern SSL_METHOD *SSLv23_server_method(void);
  262. extern SSL_METHOD *SSLv23_client_method(void);
  263. extern int SSL_library_init(void);
  264. extern void SSL_load_error_strings(void);
  265. extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
  266. extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
  267. extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
  268. extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
  269. extern void SSL_CTX_free(SSL_CTX *);
  270. extern unsigned long ERR_get_error(void);
  271. extern char *ERR_error_string(unsigned long, char *);
  272. extern int CRYPTO_num_locks(void);
  273. extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
  274. extern void CRYPTO_set_id_callback(unsigned long (*)(void));
  275. #else
  276. // Dynamically loaded SSL functionality
  277. struct ssl_func {
  278. const char *name; // SSL function name
  279. void (*ptr)(void); // Function pointer
  280. };
  281. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  282. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  283. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  284. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  285. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  286. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  287. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  288. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  289. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  290. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  291. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  292. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  293. const char *, int)) ssl_sw[11].ptr)
  294. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  295. const char *, int)) ssl_sw[12].ptr)
  296. #define SSL_CTX_set_default_passwd_cb \
  297. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  298. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  299. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  300. #define SSL_CTX_use_certificate_chain_file \
  301. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  302. #define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
  303. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  304. #define CRYPTO_set_locking_callback \
  305. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  306. #define CRYPTO_set_id_callback \
  307. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  308. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  309. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  310. // set_ssl_option() function updates this array.
  311. // It loads SSL library dynamically and changes NULLs to the actual addresses
  312. // of respective functions. The macros above (like SSL_connect()) are really
  313. // just calling these functions indirectly via the pointer.
  314. static struct ssl_func ssl_sw[] = {
  315. {"SSL_free", NULL},
  316. {"SSL_accept", NULL},
  317. {"SSL_connect", NULL},
  318. {"SSL_read", NULL},
  319. {"SSL_write", NULL},
  320. {"SSL_get_error", NULL},
  321. {"SSL_set_fd", NULL},
  322. {"SSL_new", NULL},
  323. {"SSL_CTX_new", NULL},
  324. {"SSLv23_server_method", NULL},
  325. {"SSL_library_init", NULL},
  326. {"SSL_CTX_use_PrivateKey_file", NULL},
  327. {"SSL_CTX_use_certificate_file",NULL},
  328. {"SSL_CTX_set_default_passwd_cb",NULL},
  329. {"SSL_CTX_free", NULL},
  330. {"SSL_load_error_strings", NULL},
  331. {"SSL_CTX_use_certificate_chain_file", NULL},
  332. {"SSLv23_client_method", NULL},
  333. {NULL, NULL}
  334. };
  335. // Similar array as ssl_sw. These functions could be located in different lib.
  336. #if !defined(NO_SSL)
  337. static struct ssl_func crypto_sw[] = {
  338. {"CRYPTO_num_locks", NULL},
  339. {"CRYPTO_set_locking_callback", NULL},
  340. {"CRYPTO_set_id_callback", NULL},
  341. {"ERR_get_error", NULL},
  342. {"ERR_error_string", NULL},
  343. {NULL, NULL}
  344. };
  345. #endif // NO_SSL
  346. #endif // NO_SSL_DL
  347. static const char *month_names[] = {
  348. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  349. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  350. };
  351. // Unified socket address. For IPv6 support, add IPv6 address structure
  352. // in the union u.
  353. union usa {
  354. struct sockaddr sa;
  355. struct sockaddr_in sin;
  356. #if defined(USE_IPV6)
  357. struct sockaddr_in6 sin6;
  358. #endif
  359. };
  360. // Describes a string (chunk of memory).
  361. struct vec {
  362. const char *ptr;
  363. size_t len;
  364. };
  365. // Structure used by mg_stat() function. Uses 64 bit file length.
  366. struct mgstat {
  367. int is_directory; // Directory marker
  368. int64_t size; // File size
  369. time_t mtime; // Modification time
  370. };
  371. // Describes listening socket, or socket which was accept()-ed by the master
  372. // thread and queued for future handling by the worker thread.
  373. struct socket {
  374. struct socket *next; // Linkage
  375. SOCKET sock; // Listening socket
  376. union usa lsa; // Local socket address
  377. union usa rsa; // Remote socket address
  378. int is_ssl; // Is socket SSL-ed
  379. };
  380. // NOTE(lsm): this enum shoulds be in sync with the config_options below.
  381. enum {
  382. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  383. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
  384. ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  385. GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
  386. EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
  387. NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES,
  388. NUM_OPTIONS
  389. };
  390. static const char *config_options[] = {
  391. "C", "cgi_pattern", "**.cgi$|**.pl$|**.php$",
  392. "E", "cgi_environment", NULL,
  393. "G", "put_delete_passwords_file", NULL,
  394. "I", "cgi_interpreter", NULL,
  395. "P", "protect_uri", NULL,
  396. "R", "authentication_domain", "mydomain.com",
  397. "S", "ssi_pattern", "**.shtml$|**.shtm$",
  398. "T", "throttle", NULL,
  399. "a", "access_log_file", NULL,
  400. "d", "enable_directory_listing", "yes",
  401. "e", "error_log_file", NULL,
  402. "g", "global_passwords_file", NULL,
  403. "i", "index_files", "index.html,index.htm,index.cgi,index.shtml,index.php",
  404. "k", "enable_keep_alive", "no",
  405. "l", "access_control_list", NULL,
  406. "m", "extra_mime_types", NULL,
  407. "p", "listening_ports", "8080",
  408. "r", "document_root", ".",
  409. "s", "ssl_certificate", NULL,
  410. "t", "num_threads", "20",
  411. "u", "run_as_user", NULL,
  412. "w", "url_rewrite_patterns", NULL,
  413. "x", "hide_files_patterns", NULL,
  414. NULL
  415. };
  416. #define ENTRIES_PER_CONFIG_OPTION 3
  417. struct mg_context {
  418. volatile int stop_flag; // Should we stop event loop
  419. SSL_CTX *ssl_ctx; // SSL context
  420. SSL_CTX *client_ssl_ctx; // Client SSL context
  421. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  422. mg_callback_t user_callback; // User-defined callback function
  423. void *user_data; // User-defined data
  424. struct socket *listening_sockets;
  425. volatile int num_threads; // Number of threads
  426. pthread_mutex_t mutex; // Protects (max|num)_threads
  427. pthread_cond_t cond; // Condvar for tracking workers terminations
  428. struct socket queue[20]; // Accepted sockets
  429. volatile int sq_head; // Head of the socket queue
  430. volatile int sq_tail; // Tail of the socket queue
  431. pthread_cond_t sq_full; // Signaled when socket is produced
  432. pthread_cond_t sq_empty; // Signaled when socket is consumed
  433. };
  434. struct mg_connection {
  435. struct mg_request_info request_info;
  436. struct mg_context *ctx;
  437. SSL *ssl; // SSL descriptor
  438. struct socket client; // Connected client
  439. time_t birth_time; // Time when request was received
  440. int64_t num_bytes_sent; // Total bytes sent to client
  441. int64_t content_len; // Content-Length header value
  442. int64_t consumed_content; // How many bytes of content have been read
  443. char *buf; // Buffer for received data
  444. char *path_info; // PATH_INFO part of the URL
  445. char *log_message; // Placeholder for the mongoose error log message
  446. int must_close; // 1 if connection must be closed
  447. int buf_size; // Buffer size
  448. int request_len; // Size of the request + headers in a buffer
  449. int data_len; // Total size of data in a buffer
  450. int status_code; // HTTP reply status code, e.g. 200
  451. int throttle; // Throttling, bytes/sec. <= 0 means no throttle
  452. time_t last_throttle_time; // Last time throttled data was sent
  453. int64_t last_throttle_bytes;// Bytes sent this second
  454. };
  455. const char **mg_get_valid_option_names(void) {
  456. return config_options;
  457. }
  458. static void *call_user(struct mg_connection *conn, enum mg_event event) {
  459. return conn == NULL || conn->ctx == NULL || conn->ctx->user_callback == NULL ?
  460. NULL : conn->ctx->user_callback(event, conn);
  461. }
  462. void *mg_get_user_data(struct mg_connection *conn) {
  463. return conn != NULL && conn->ctx != NULL ? conn->ctx->user_data : NULL;
  464. }
  465. const char *mg_get_log_message(const struct mg_connection *conn) {
  466. return conn == NULL ? NULL : conn->log_message;
  467. }
  468. int mg_get_reply_status_code(const struct mg_connection *conn) {
  469. return conn == NULL ? -1 : conn->status_code;
  470. }
  471. void *mg_get_ssl_context(const struct mg_connection *conn) {
  472. return conn == NULL || conn->ctx == NULL ? NULL : conn->ctx->ssl_ctx;
  473. }
  474. static int get_option_index(const char *name) {
  475. int i;
  476. for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
  477. if (strcmp(config_options[i], name) == 0 ||
  478. strcmp(config_options[i + 1], name) == 0) {
  479. return i / ENTRIES_PER_CONFIG_OPTION;
  480. }
  481. }
  482. return -1;
  483. }
  484. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  485. int i;
  486. if ((i = get_option_index(name)) == -1) {
  487. return NULL;
  488. } else if (ctx->config[i] == NULL) {
  489. return "";
  490. } else {
  491. return ctx->config[i];
  492. }
  493. }
  494. static void sockaddr_to_string(char *buf, size_t len,
  495. const union usa *usa) {
  496. buf[0] = '\0';
  497. #if defined(USE_IPV6)
  498. inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
  499. (void *) &usa->sin.sin_addr :
  500. (void *) &usa->sin6.sin6_addr, buf, len);
  501. #elif defined(_WIN32)
  502. // Only Windoze Vista (and newer) have inet_ntop()
  503. strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
  504. #else
  505. inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
  506. #endif
  507. }
  508. static void cry(struct mg_connection *conn,
  509. PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
  510. // Print error message to the opened error log stream.
  511. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  512. char buf[MG_BUF_LEN], src_addr[20];
  513. va_list ap;
  514. FILE *fp;
  515. time_t timestamp;
  516. va_start(ap, fmt);
  517. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  518. va_end(ap);
  519. // Do not lock when getting the callback value, here and below.
  520. // I suppose this is fine, since function cannot disappear in the
  521. // same way string option can.
  522. conn->log_message = buf;
  523. if (call_user(conn, MG_EVENT_LOG) == NULL) {
  524. fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  525. mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  526. if (fp != NULL) {
  527. flockfile(fp);
  528. timestamp = time(NULL);
  529. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  530. fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
  531. src_addr);
  532. if (conn->request_info.request_method != NULL) {
  533. fprintf(fp, "%s %s: ", conn->request_info.request_method,
  534. conn->request_info.uri);
  535. }
  536. (void) fprintf(fp, "%s", buf);
  537. fputc('\n', fp);
  538. funlockfile(fp);
  539. if (fp != stderr) {
  540. fclose(fp);
  541. }
  542. }
  543. }
  544. conn->log_message = NULL;
  545. }
  546. // Return fake connection structure. Used for logging, if connection
  547. // is not applicable at the moment of logging.
  548. static struct mg_connection *fc(struct mg_context *ctx) {
  549. static struct mg_connection fake_connection;
  550. fake_connection.ctx = ctx;
  551. return &fake_connection;
  552. }
  553. const char *mg_version(void) {
  554. return MONGOOSE_VERSION;
  555. }
  556. const struct mg_request_info *
  557. mg_get_request_info(const struct mg_connection *conn) {
  558. return &conn->request_info;
  559. }
  560. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  561. for (; *src != '\0' && n > 1; n--) {
  562. *dst++ = *src++;
  563. }
  564. *dst = '\0';
  565. }
  566. static int lowercase(const char *s) {
  567. return tolower(* (const unsigned char *) s);
  568. }
  569. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  570. int diff = 0;
  571. if (len > 0)
  572. do {
  573. diff = lowercase(s1++) - lowercase(s2++);
  574. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  575. return diff;
  576. }
  577. static int mg_strcasecmp(const char *s1, const char *s2) {
  578. int diff;
  579. do {
  580. diff = lowercase(s1++) - lowercase(s2++);
  581. } while (diff == 0 && s1[-1] != '\0');
  582. return diff;
  583. }
  584. static char * mg_strndup(const char *ptr, size_t len) {
  585. char *p;
  586. if ((p = (char *) malloc(len + 1)) != NULL) {
  587. mg_strlcpy(p, ptr, len + 1);
  588. }
  589. return p;
  590. }
  591. static char * mg_strdup(const char *str) {
  592. return mg_strndup(str, strlen(str));
  593. }
  594. // Like snprintf(), but never returns negative value, or a value
  595. // that is larger than a supplied buffer.
  596. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  597. // in his audit report.
  598. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  599. const char *fmt, va_list ap) {
  600. int n;
  601. if (buflen == 0)
  602. return 0;
  603. n = vsnprintf(buf, buflen, fmt, ap);
  604. if (n < 0) {
  605. cry(conn, "vsnprintf error");
  606. n = 0;
  607. } else if (n >= (int) buflen) {
  608. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  609. n > 200 ? 200 : n, buf);
  610. n = (int) buflen - 1;
  611. }
  612. buf[n] = '\0';
  613. return n;
  614. }
  615. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  616. PRINTF_FORMAT_STRING(const char *fmt), ...)
  617. PRINTF_ARGS(4, 5);
  618. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  619. const char *fmt, ...) {
  620. va_list ap;
  621. int n;
  622. va_start(ap, fmt);
  623. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  624. va_end(ap);
  625. return n;
  626. }
  627. // Skip the characters until one of the delimiters characters found.
  628. // 0-terminate resulting word. Skip the delimiter and following whitespaces if any.
  629. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  630. // Delimiters can be quoted with quotechar.
  631. static char *skip_quoted(char **buf, const char *delimiters,
  632. const char *whitespace, char quotechar) {
  633. char *p, *begin_word, *end_word, *end_whitespace;
  634. begin_word = *buf;
  635. end_word = begin_word + strcspn(begin_word, delimiters);
  636. // Check for quotechar
  637. if (end_word > begin_word) {
  638. p = end_word - 1;
  639. while (*p == quotechar) {
  640. // If there is anything beyond end_word, copy it
  641. if (*end_word == '\0') {
  642. *p = '\0';
  643. break;
  644. } else {
  645. size_t end_off = strcspn(end_word + 1, delimiters);
  646. memmove (p, end_word, end_off + 1);
  647. p += end_off; // p must correspond to end_word - 1
  648. end_word += end_off + 1;
  649. }
  650. }
  651. for (p++; p < end_word; p++) {
  652. *p = '\0';
  653. }
  654. }
  655. if (*end_word == '\0') {
  656. *buf = end_word;
  657. } else {
  658. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  659. for (p = end_word; p < end_whitespace; p++) {
  660. *p = '\0';
  661. }
  662. *buf = end_whitespace;
  663. }
  664. return begin_word;
  665. }
  666. // Simplified version of skip_quoted without quote char
  667. // and whitespace == delimiters
  668. static char *skip(char **buf, const char *delimiters) {
  669. return skip_quoted(buf, delimiters, delimiters, 0);
  670. }
  671. // Return HTTP header value, or NULL if not found.
  672. static const char *get_header(const struct mg_request_info *ri,
  673. const char *name) {
  674. int i;
  675. for (i = 0; i < ri->num_headers; i++)
  676. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  677. return ri->http_headers[i].value;
  678. return NULL;
  679. }
  680. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  681. return get_header(&conn->request_info, name);
  682. }
  683. // A helper function for traversing a comma separated list of values.
  684. // It returns a list pointer shifted to the next value, or NULL if the end
  685. // of the list found.
  686. // Value is stored in val vector. If value has form "x=y", then eq_val
  687. // vector is initialized to point to the "y" part, and val vector length
  688. // is adjusted to point only to "x".
  689. static const char *next_option(const char *list, struct vec *val,
  690. struct vec *eq_val) {
  691. if (list == NULL || *list == '\0') {
  692. // End of the list
  693. list = NULL;
  694. } else {
  695. val->ptr = list;
  696. if ((list = strchr(val->ptr, ',')) != NULL) {
  697. // Comma found. Store length and shift the list ptr
  698. val->len = list - val->ptr;
  699. list++;
  700. } else {
  701. // This value is the last one
  702. list = val->ptr + strlen(val->ptr);
  703. val->len = list - val->ptr;
  704. }
  705. if (eq_val != NULL) {
  706. // Value has form "x=y", adjust pointers and lengths
  707. // so that val points to "x", and eq_val points to "y".
  708. eq_val->len = 0;
  709. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  710. if (eq_val->ptr != NULL) {
  711. eq_val->ptr++; // Skip over '=' character
  712. eq_val->len = val->ptr + val->len - eq_val->ptr;
  713. val->len = (eq_val->ptr - val->ptr) - 1;
  714. }
  715. }
  716. }
  717. return list;
  718. }
  719. static int match_prefix(const char *pattern, int pattern_len, const char *str) {
  720. const char *or_str;
  721. int i, j, len, res;
  722. if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
  723. res = match_prefix(pattern, or_str - pattern, str);
  724. return res > 0 ? res :
  725. match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
  726. }
  727. i = j = 0;
  728. res = -1;
  729. for (; i < pattern_len; i++, j++) {
  730. if (pattern[i] == '?' && str[j] != '\0') {
  731. continue;
  732. } else if (pattern[i] == '$') {
  733. return str[j] == '\0' ? j : -1;
  734. } else if (pattern[i] == '*') {
  735. i++;
  736. if (pattern[i] == '*') {
  737. i++;
  738. len = (int) strlen(str + j);
  739. } else {
  740. len = (int) strcspn(str + j, "/");
  741. }
  742. if (i == pattern_len) {
  743. return j + len;
  744. }
  745. do {
  746. res = match_prefix(pattern + i, pattern_len - i, str + j + len);
  747. } while (res == -1 && len-- > 0);
  748. return res == -1 ? -1 : j + res + len;
  749. } else if (pattern[i] != str[j]) {
  750. return -1;
  751. }
  752. }
  753. return j;
  754. }
  755. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  756. // This function must tolerate situations when connection info is not
  757. // set up, for example if request parsing failed.
  758. static int should_keep_alive(const struct mg_connection *conn) {
  759. const char *http_version = conn->request_info.http_version;
  760. const char *header = mg_get_header(conn, "Connection");
  761. if (conn->must_close ||
  762. conn->status_code == 401 ||
  763. mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
  764. (header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
  765. (header == NULL && http_version && strcmp(http_version, "1.1"))) {
  766. return 0;
  767. }
  768. return 1;
  769. }
  770. static const char *suggest_connection_header(const struct mg_connection *conn) {
  771. return should_keep_alive(conn) ? "keep-alive" : "close";
  772. }
  773. static void send_http_error(struct mg_connection *, int, const char *,
  774. PRINTF_FORMAT_STRING(const char *fmt), ...)
  775. PRINTF_ARGS(4, 5);
  776. static void send_http_error(struct mg_connection *conn, int status,
  777. const char *reason, const char *fmt, ...) {
  778. char buf[MG_BUF_LEN];
  779. va_list ap;
  780. int len;
  781. conn->status_code = status;
  782. if (call_user(conn, MG_HTTP_ERROR) == NULL) {
  783. buf[0] = '\0';
  784. len = 0;
  785. // Errors 1xx, 204 and 304 MUST NOT send a body
  786. if (status > 199 && status != 204 && status != 304) {
  787. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  788. buf[len++] = '\n';
  789. va_start(ap, fmt);
  790. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  791. va_end(ap);
  792. }
  793. DEBUG_TRACE(("[%s]", buf));
  794. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  795. "Content-Length: %d\r\n"
  796. "Connection: %s\r\n\r\n", status, reason, len,
  797. suggest_connection_header(conn));
  798. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  799. }
  800. }
  801. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  802. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  803. unused = NULL;
  804. *mutex = CreateMutex(NULL, FALSE, NULL);
  805. return *mutex == NULL ? -1 : 0;
  806. }
  807. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  808. return CloseHandle(*mutex) == 0 ? -1 : 0;
  809. }
  810. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  811. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  812. }
  813. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  814. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  815. }
  816. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  817. unused = NULL;
  818. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  819. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  820. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  821. }
  822. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  823. HANDLE handles[] = {cv->signal, cv->broadcast};
  824. ReleaseMutex(*mutex);
  825. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  826. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  827. }
  828. static int pthread_cond_signal(pthread_cond_t *cv) {
  829. return SetEvent(cv->signal) == 0 ? -1 : 0;
  830. }
  831. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  832. // Implementation with PulseEvent() has race condition, see
  833. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  834. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  835. }
  836. static int pthread_cond_destroy(pthread_cond_t *cv) {
  837. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  838. }
  839. // For Windows, change all slashes to backslashes in path names.
  840. static void change_slashes_to_backslashes(char *path) {
  841. int i;
  842. for (i = 0; path[i] != '\0'; i++) {
  843. if (path[i] == '/')
  844. path[i] = '\\';
  845. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  846. if (path[i] == '\\' && i > 0)
  847. while (path[i + 1] == '\\' || path[i + 1] == '/')
  848. (void) memmove(path + i + 1,
  849. path + i + 2, strlen(path + i + 1));
  850. }
  851. }
  852. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  853. // wbuf and wbuf_len is a target buffer and its length.
  854. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  855. char buf[PATH_MAX], buf2[PATH_MAX], *p;
  856. mg_strlcpy(buf, path, sizeof(buf));
  857. change_slashes_to_backslashes(buf);
  858. // Point p to the end of the file name
  859. p = buf + strlen(buf) - 1;
  860. // Trim trailing backslash character
  861. while (p > buf && *p == '\\' && p[-1] != ':') {
  862. *p-- = '\0';
  863. }
  864. // Protect from CGI code disclosure.
  865. // This is very nasty hole. Windows happily opens files with
  866. // some garbage in the end of file name. So fopen("a.cgi ", "r")
  867. // actually opens "a.cgi", and does not return an error!
  868. if (*p == 0x20 || // No space at the end
  869. (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path
  870. *p == 0x2b || // No '+'
  871. (*p & ~0x7f)) { // And generally no non-ASCII chars
  872. (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
  873. wbuf[0] = L'\0';
  874. } else {
  875. // Convert to Unicode and back. If doubly-converted string does not
  876. // match the original, something is fishy, reject.
  877. memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
  878. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  879. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  880. NULL, NULL);
  881. if (strcmp(buf, buf2) != 0) {
  882. wbuf[0] = L'\0';
  883. }
  884. }
  885. }
  886. #if defined(_WIN32_WCE)
  887. static time_t time(time_t *ptime) {
  888. time_t t;
  889. SYSTEMTIME st;
  890. FILETIME ft;
  891. GetSystemTime(&st);
  892. SystemTimeToFileTime(&st, &ft);
  893. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  894. if (ptime != NULL) {
  895. *ptime = t;
  896. }
  897. return t;
  898. }
  899. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  900. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  901. FILETIME ft, lft;
  902. SYSTEMTIME st;
  903. TIME_ZONE_INFORMATION tzinfo;
  904. if (ptm == NULL) {
  905. return NULL;
  906. }
  907. * (int64_t *) &ft = t;
  908. FileTimeToLocalFileTime(&ft, &lft);
  909. FileTimeToSystemTime(&lft, &st);
  910. ptm->tm_year = st.wYear - 1900;
  911. ptm->tm_mon = st.wMonth - 1;
  912. ptm->tm_wday = st.wDayOfWeek;
  913. ptm->tm_mday = st.wDay;
  914. ptm->tm_hour = st.wHour;
  915. ptm->tm_min = st.wMinute;
  916. ptm->tm_sec = st.wSecond;
  917. ptm->tm_yday = 0; // hope nobody uses this
  918. ptm->tm_isdst =
  919. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  920. return ptm;
  921. }
  922. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  923. // FIXME(lsm): fix this.
  924. return localtime(ptime, ptm);
  925. }
  926. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  927. const struct tm *tm) {
  928. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  929. return 0;
  930. }
  931. #endif
  932. static int mg_rename(const char* oldname, const char* newname) {
  933. wchar_t woldbuf[PATH_MAX];
  934. wchar_t wnewbuf[PATH_MAX];
  935. to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
  936. to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
  937. return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
  938. }
  939. static FILE *mg_fopen(const char *path, const char *mode) {
  940. wchar_t wbuf[PATH_MAX], wmode[20];
  941. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  942. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  943. return _wfopen(wbuf, wmode);
  944. }
  945. static int mg_stat(const char *path, struct mgstat *stp) {
  946. int ok = -1; // Error
  947. wchar_t wbuf[PATH_MAX];
  948. WIN32_FILE_ATTRIBUTE_DATA info;
  949. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  950. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  951. stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  952. stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
  953. info.ftLastWriteTime.dwHighDateTime);
  954. stp->is_directory =
  955. info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  956. ok = 0; // Success
  957. }
  958. return ok;
  959. }
  960. static int mg_remove(const char *path) {
  961. wchar_t wbuf[PATH_MAX];
  962. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  963. return DeleteFileW(wbuf) ? 0 : -1;
  964. }
  965. static int mg_mkdir(const char *path, int mode) {
  966. char buf[PATH_MAX];
  967. wchar_t wbuf[PATH_MAX];
  968. mode = 0; // Unused
  969. mg_strlcpy(buf, path, sizeof(buf));
  970. change_slashes_to_backslashes(buf);
  971. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
  972. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  973. }
  974. // Implementation of POSIX opendir/closedir/readdir for Windows.
  975. static DIR * opendir(const char *name) {
  976. DIR *dir = NULL;
  977. wchar_t wpath[PATH_MAX];
  978. DWORD attrs;
  979. if (name == NULL) {
  980. SetLastError(ERROR_BAD_ARGUMENTS);
  981. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  982. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  983. } else {
  984. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  985. attrs = GetFileAttributesW(wpath);
  986. if (attrs != 0xFFFFFFFF &&
  987. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  988. (void) wcscat(wpath, L"\\*");
  989. dir->handle = FindFirstFileW(wpath, &dir->info);
  990. dir->result.d_name[0] = '\0';
  991. } else {
  992. free(dir);
  993. dir = NULL;
  994. }
  995. }
  996. return dir;
  997. }
  998. static int closedir(DIR *dir) {
  999. int result = 0;
  1000. if (dir != NULL) {
  1001. if (dir->handle != INVALID_HANDLE_VALUE)
  1002. result = FindClose(dir->handle) ? 0 : -1;
  1003. free(dir);
  1004. } else {
  1005. result = -1;
  1006. SetLastError(ERROR_BAD_ARGUMENTS);
  1007. }
  1008. return result;
  1009. }
  1010. static struct dirent *readdir(DIR *dir) {
  1011. struct dirent *result = 0;
  1012. if (dir) {
  1013. if (dir->handle != INVALID_HANDLE_VALUE) {
  1014. result = &dir->result;
  1015. (void) WideCharToMultiByte(CP_UTF8, 0,
  1016. dir->info.cFileName, -1, result->d_name,
  1017. sizeof(result->d_name), NULL, NULL);
  1018. if (!FindNextFileW(dir->handle, &dir->info)) {
  1019. (void) FindClose(dir->handle);
  1020. dir->handle = INVALID_HANDLE_VALUE;
  1021. }
  1022. } else {
  1023. SetLastError(ERROR_FILE_NOT_FOUND);
  1024. }
  1025. } else {
  1026. SetLastError(ERROR_BAD_ARGUMENTS);
  1027. }
  1028. return result;
  1029. }
  1030. #define set_close_on_exec(fd) // No FD_CLOEXEC on Windows
  1031. int mg_start_thread(mg_thread_func_t f, void *p) {
  1032. return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
  1033. }
  1034. static HANDLE dlopen(const char *dll_name, int flags) {
  1035. wchar_t wbuf[PATH_MAX];
  1036. flags = 0; // Unused
  1037. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  1038. return LoadLibraryW(wbuf);
  1039. }
  1040. #if !defined(NO_CGI)
  1041. #define SIGKILL 0
  1042. static int kill(pid_t pid, int sig_num) {
  1043. (void) TerminateProcess(pid, sig_num);
  1044. (void) CloseHandle(pid);
  1045. return 0;
  1046. }
  1047. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1048. char *envblk, char *envp[], int fd_stdin,
  1049. int fd_stdout, const char *dir) {
  1050. HANDLE me;
  1051. char *p, *interp, full_interp[PATH_MAX], cmdline[PATH_MAX], buf[PATH_MAX];
  1052. FILE *fp;
  1053. STARTUPINFOA si = { sizeof(si) };
  1054. PROCESS_INFORMATION pi = { 0 };
  1055. envp = NULL; // Unused
  1056. // TODO(lsm): redirect CGI errors to the error log file
  1057. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  1058. si.wShowWindow = SW_HIDE;
  1059. me = GetCurrentProcess();
  1060. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  1061. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1062. DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  1063. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  1064. // If CGI file is a script, try to read the interpreter line
  1065. interp = conn->ctx->config[CGI_INTERPRETER];
  1066. if (interp == NULL) {
  1067. buf[0] = buf[2] = '\0';
  1068. // Read the first line of the script into the buffer
  1069. snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
  1070. if ((fp = mg_fopen(cmdline, "r")) != NULL) {
  1071. fgets(buf, sizeof(buf), fp);
  1072. fclose(fp);
  1073. buf[sizeof(buf) - 1] = '\0';
  1074. }
  1075. if (buf[0] == '#' && buf[1] == '!') {
  1076. // Trim whitespace in interpreter name
  1077. for (p = buf + 2; *p != '\0' && isspace(* (unsigned char *) p); )
  1078. p++;
  1079. *p = '\0';
  1080. }
  1081. interp = buf + 2;
  1082. }
  1083. if (interp[0] != '\0') {
  1084. GetFullPathName(interp, sizeof(full_interp), full_interp, NULL);
  1085. interp = full_interp;
  1086. }
  1087. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s",
  1088. interp, interp[0] == '\0' ? "" : " ", prog);
  1089. DEBUG_TRACE(("Running [%s]", cmdline));
  1090. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1091. CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
  1092. cry(conn, "%s: CreateProcess(%s): %d",
  1093. __func__, cmdline, ERRNO);
  1094. pi.hProcess = (pid_t) -1;
  1095. }
  1096. // Always close these to prevent handle leakage.
  1097. (void) close(fd_stdin);
  1098. (void) close(fd_stdout);
  1099. (void) CloseHandle(si.hStdOutput);
  1100. (void) CloseHandle(si.hStdInput);
  1101. (void) CloseHandle(pi.hThread);
  1102. return (pid_t) pi.hProcess;
  1103. }
  1104. #endif // !NO_CGI
  1105. static int set_non_blocking_mode(SOCKET sock) {
  1106. unsigned long on = 1;
  1107. return ioctlsocket(sock, FIONBIO, &on);
  1108. }
  1109. #else
  1110. static int mg_stat(const char *path, struct mgstat *stp) {
  1111. struct stat st;
  1112. int ok;
  1113. if (stat(path, &st) == 0) {
  1114. ok = 0;
  1115. stp->size = st.st_size;
  1116. stp->mtime = st.st_mtime;
  1117. stp->is_directory = S_ISDIR(st.st_mode);
  1118. } else {
  1119. ok = -1;
  1120. }
  1121. return ok;
  1122. }
  1123. static void set_close_on_exec(int fd) {
  1124. (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
  1125. }
  1126. int mg_start_thread(mg_thread_func_t func, void *param) {
  1127. pthread_t thread_id;
  1128. pthread_attr_t attr;
  1129. (void) pthread_attr_init(&attr);
  1130. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1131. // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
  1132. // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
  1133. return pthread_create(&thread_id, &attr, func, param);
  1134. }
  1135. #ifndef NO_CGI
  1136. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1137. char *envblk, char *envp[], int fd_stdin,
  1138. int fd_stdout, const char *dir) {
  1139. pid_t pid;
  1140. const char *interp;
  1141. envblk = NULL; // Unused
  1142. if ((pid = fork()) == -1) {
  1143. // Parent
  1144. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1145. } else if (pid == 0) {
  1146. // Child
  1147. if (chdir(dir) != 0) {
  1148. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1149. } else if (dup2(fd_stdin, 0) == -1) {
  1150. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1151. } else if (dup2(fd_stdout, 1) == -1) {
  1152. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1153. } else {
  1154. (void) dup2(fd_stdout, 2);
  1155. (void) close(fd_stdin);
  1156. (void) close(fd_stdout);
  1157. interp = conn->ctx->config[CGI_INTERPRETER];
  1158. if (interp == NULL) {
  1159. (void) execle(prog, prog, NULL, envp);
  1160. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1161. } else {
  1162. (void) execle(interp, interp, prog, NULL, envp);
  1163. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1164. strerror(ERRNO));
  1165. }
  1166. }
  1167. exit(EXIT_FAILURE);
  1168. }
  1169. // Parent. Close stdio descriptors
  1170. (void) close(fd_stdin);
  1171. (void) close(fd_stdout);
  1172. return pid;
  1173. }
  1174. #endif // !NO_CGI
  1175. static int set_non_blocking_mode(SOCKET sock) {
  1176. int flags;
  1177. flags = fcntl(sock, F_GETFL, 0);
  1178. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1179. return 0;
  1180. }
  1181. #endif // _WIN32
  1182. // Write data to the IO channel - opened file descriptor, socket or SSL
  1183. // descriptor. Return number of bytes written.
  1184. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1185. int64_t len) {
  1186. int64_t sent;
  1187. int n, k;
  1188. sent = 0;
  1189. while (sent < len) {
  1190. // How many bytes we send in this iteration
  1191. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1192. if (ssl != NULL) {
  1193. n = SSL_write(ssl, buf + sent, k);
  1194. } else if (fp != NULL) {
  1195. n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
  1196. if (ferror(fp))
  1197. n = -1;
  1198. } else {
  1199. n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
  1200. }
  1201. if (n < 0)
  1202. break;
  1203. sent += n;
  1204. }
  1205. return sent;
  1206. }
  1207. // This function is needed to prevent Mongoose to be stuck in a blocking
  1208. // socket read when user requested exit. To do that, we sleep in select
  1209. // with a timeout, and when returned, check the context for the stop flag.
  1210. // If it is set, we return 0, and this means that we must not continue
  1211. // reading, must give up and close the connection and exit serving thread.
  1212. static int wait_until_socket_is_readable(struct mg_connection *conn) {
  1213. int result;
  1214. struct timeval tv;
  1215. fd_set set;
  1216. do {
  1217. tv.tv_sec = 0;
  1218. tv.tv_usec = 300 * 1000;
  1219. FD_ZERO(&set);
  1220. FD_SET(conn->client.sock, &set);
  1221. result = select(conn->client.sock + 1, &set, NULL, NULL, &tv);
  1222. } while ((result == 0 || (result < 0 && ERRNO == EINTR)) &&
  1223. conn->ctx->stop_flag == 0);
  1224. return conn->ctx->stop_flag || result < 0 ? 0 : 1;
  1225. }
  1226. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1227. // Return negative value on error, or number of bytes read on success.
  1228. static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
  1229. int nread;
  1230. if (fp != NULL) {
  1231. // Use read() instead of fread(), because if we're reading from the CGI
  1232. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1233. // to block and must pass all read bytes immediately to the client.
  1234. nread = read(fileno(fp), buf, (size_t) len);
  1235. } else if (!wait_until_socket_is_readable(conn)) {
  1236. nread = -1;
  1237. } else if (conn->ssl != NULL) {
  1238. nread = SSL_read(conn->ssl, buf, len);
  1239. } else {
  1240. nread = recv(conn->client.sock, buf, (size_t) len, 0);
  1241. }
  1242. return conn->ctx->stop_flag ? -1 : nread;
  1243. }
  1244. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1245. int n, buffered_len, nread;
  1246. const char *body;
  1247. nread = 0;
  1248. if (conn->consumed_content < conn->content_len) {
  1249. // Adjust number of bytes to read.
  1250. int64_t to_read = conn->content_len - conn->consumed_content;
  1251. if (to_read < (int64_t) len) {
  1252. len = (size_t) to_read;
  1253. }
  1254. // Return buffered data
  1255. body = conn->buf + conn->request_len + conn->consumed_content;
  1256. buffered_len = &conn->buf[conn->data_len] - body;
  1257. if (buffered_len > 0) {
  1258. if (len < (size_t) buffered_len) {
  1259. buffered_len = (int) len;
  1260. }
  1261. memcpy(buf, body, (size_t) buffered_len);
  1262. len -= buffered_len;
  1263. conn->consumed_content += buffered_len;
  1264. nread += buffered_len;
  1265. buf = (char *) buf + buffered_len;
  1266. }
  1267. // We have returned all buffered data. Read new data from the remote socket.
  1268. while (len > 0) {
  1269. n = pull(NULL, conn, (char *) buf, (int) len);
  1270. if (n < 0) {
  1271. nread = n; // Propagate the error
  1272. break;
  1273. } else if (n == 0) {
  1274. break; // No more data to read
  1275. } else {
  1276. buf = (char *) buf + n;
  1277. conn->consumed_content += n;
  1278. nread += n;
  1279. len -= n;
  1280. }
  1281. }
  1282. }
  1283. return nread;
  1284. }
  1285. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1286. time_t now;
  1287. int64_t n, total, allowed;
  1288. if (conn->throttle > 0) {
  1289. if ((now = time(NULL)) != conn->last_throttle_time) {
  1290. conn->last_throttle_time = now;
  1291. conn->last_throttle_bytes = 0;
  1292. }
  1293. allowed = conn->throttle - conn->last_throttle_bytes;
  1294. if (allowed > (int64_t) len) {
  1295. allowed = len;
  1296. }
  1297. if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1298. (int64_t) allowed)) == allowed) {
  1299. buf = (char *) buf + total;
  1300. conn->last_throttle_bytes += total;
  1301. while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
  1302. allowed = conn->throttle > (int64_t) len - total ?
  1303. len - total : conn->throttle;
  1304. if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1305. (int64_t) allowed)) != allowed) {
  1306. break;
  1307. }
  1308. sleep(1);
  1309. conn->last_throttle_bytes = allowed;
  1310. conn->last_throttle_time = time(NULL);
  1311. buf = (char *) buf + n;
  1312. total += n;
  1313. }
  1314. }
  1315. } else {
  1316. total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
  1317. (int64_t) len);
  1318. }
  1319. return (int) total;
  1320. }
  1321. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1322. char mem[MG_BUF_LEN], *buf = mem;
  1323. int len;
  1324. va_list ap;
  1325. // Print in a local buffer first, hoping that it is large enough to
  1326. // hold the whole message
  1327. va_start(ap, fmt);
  1328. len = vsnprintf(mem, sizeof(mem), fmt, ap);
  1329. va_end(ap);
  1330. if (len == 0) {
  1331. // Do nothing. mg_printf(conn, "%s", "") was called.
  1332. } else if (len < 0) {
  1333. // vsnprintf() error, give up
  1334. len = -1;
  1335. cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt);
  1336. } else if (len > (int) sizeof(mem) && (buf = (char *) malloc(len + 1)) != NULL) {
  1337. // Local buffer is not large enough, allocate big buffer on heap
  1338. va_start(ap, fmt);
  1339. vsnprintf(buf, len + 1, fmt, ap);
  1340. va_end(ap);
  1341. len = mg_write(conn, buf, (size_t) len);
  1342. free(buf);
  1343. } else if (len > (int) sizeof(mem)) {
  1344. // Failed to allocate large enough buffer, give up
  1345. cry(conn, "%s(%s, ...): Can't allocate %d bytes, not printing anything",
  1346. __func__, fmt, len);
  1347. len = -1;
  1348. } else {
  1349. // Copy to the local buffer succeeded
  1350. len = mg_write(conn, buf, (size_t) len);
  1351. }
  1352. return len;
  1353. }
  1354. // URL-decode input buffer into destination buffer.
  1355. // 0-terminate the destination buffer. Return the length of decoded data.
  1356. // form-url-encoded data differs from URI encoding in a way that it
  1357. // uses '+' as character for space, see RFC 1866 section 8.2.1
  1358. // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
  1359. static size_t url_decode(const char *src, size_t src_len, char *dst,
  1360. size_t dst_len, int is_form_url_encoded) {
  1361. size_t i, j;
  1362. int a, b;
  1363. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1364. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1365. if (src[i] == '%' &&
  1366. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1367. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1368. a = tolower(* (const unsigned char *) (src + i + 1));
  1369. b = tolower(* (const unsigned char *) (src + i + 2));
  1370. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1371. i += 2;
  1372. } else if (is_form_url_encoded && src[i] == '+') {
  1373. dst[j] = ' ';
  1374. } else {
  1375. dst[j] = src[i];
  1376. }
  1377. }
  1378. dst[j] = '\0'; // Null-terminate the destination
  1379. return j;
  1380. }
  1381. // Scan given buffer and fetch the value of the given variable.
  1382. // It can be specified in query string, or in the POST data.
  1383. // Return -1 if the variable not found, or length of the URL-decoded value
  1384. // stored in dst. The dst buffer is guaranteed to be NUL-terminated if it
  1385. // is not NULL or zero-length. If dst is NULL or zero-length, then
  1386. // -2 is returned.
  1387. int mg_get_var(const char *buf, size_t buf_len, const char *name,
  1388. char *dst, size_t dst_len) {
  1389. const char *p, *e, *s;
  1390. size_t name_len;
  1391. int len;
  1392. if (dst == NULL || dst_len == 0) {
  1393. len = -2;
  1394. } else if (buf == NULL || name == NULL || buf_len == 0) {
  1395. len = -1;
  1396. dst[0] = '\0';
  1397. } else {
  1398. name_len = strlen(name);
  1399. e = buf + buf_len;
  1400. len = -1;
  1401. dst[0] = '\0';
  1402. // buf is "var1=val1&var2=val2...". Find variable first
  1403. for (p = buf; p + name_len < e; p++) {
  1404. if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
  1405. !mg_strncasecmp(name, p, name_len)) {
  1406. // Point p to variable value
  1407. p += name_len + 1;
  1408. // Point s to the end of the value
  1409. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1410. if (s == NULL) {
  1411. s = e;
  1412. }
  1413. assert(s >= p);
  1414. // Decode variable into destination buffer
  1415. if ((size_t) (s - p) < dst_len) {
  1416. len = (int) url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1417. }
  1418. break;
  1419. }
  1420. }
  1421. }
  1422. return len;
  1423. }
  1424. int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
  1425. char *dst, size_t dst_size) {
  1426. const char *s, *p, *end;
  1427. int name_len, len = -1;
  1428. dst[0] = '\0';
  1429. if ((s = mg_get_header(conn, "Cookie")) == NULL) {
  1430. return -1;
  1431. }
  1432. name_len = (int) strlen(cookie_name);
  1433. end = s + strlen(s);
  1434. for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
  1435. if (s[name_len] == '=') {
  1436. s += name_len + 1;
  1437. if ((p = strchr(s, ' ')) == NULL)
  1438. p = end;
  1439. if (p[-1] == ';')
  1440. p--;
  1441. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1442. s++;
  1443. p--;
  1444. }
  1445. if ((size_t) (p - s) < dst_size) {
  1446. len = p - s;
  1447. mg_strlcpy(dst, s, (size_t) len + 1);
  1448. }
  1449. break;
  1450. }
  1451. return len;
  1452. }
  1453. static int convert_uri_to_file_name(struct mg_connection *conn, char *buf,
  1454. size_t buf_len, struct mgstat *st) {
  1455. struct vec a, b;
  1456. const char *rewrite, *uri = conn->request_info.uri;
  1457. char *p;
  1458. int match_len, stat_result;
  1459. buf_len--; // This is because memmove() for PATH_INFO may shift part
  1460. // of the path one byte on the right.
  1461. mg_snprintf(conn, buf, buf_len, "%s%s", conn->ctx->config[DOCUMENT_ROOT],
  1462. uri);
  1463. rewrite = conn->ctx->config[REWRITE];
  1464. while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
  1465. if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
  1466. mg_snprintf(conn, buf, buf_len, "%.*s%s", (int) b.len, b.ptr,
  1467. uri + match_len);
  1468. break;
  1469. }
  1470. }
  1471. if ((stat_result = mg_stat(buf, st)) != 0) {
  1472. // Support PATH_INFO for CGI scripts.
  1473. for (p = buf + strlen(buf); p > buf + 1; p--) {
  1474. if (*p == '/') {
  1475. *p = '\0';
  1476. if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  1477. strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
  1478. (stat_result = mg_stat(buf, st)) == 0) {
  1479. // Shift PATH_INFO block one character right, e.g.
  1480. // "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
  1481. // conn->path_info is pointing to the local variable "path" declared
  1482. // in handle_request(), so PATH_INFO is not valid after
  1483. // handle_request returns.
  1484. conn->path_info = p + 1;
  1485. memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
  1486. p[1] = '/';
  1487. break;
  1488. } else {
  1489. *p = '/';
  1490. stat_result = -1;
  1491. }
  1492. }
  1493. }
  1494. }
  1495. return stat_result;
  1496. }
  1497. static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
  1498. return (conn->ssl = SSL_new(s)) != NULL &&
  1499. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  1500. func(conn->ssl) == 1;
  1501. }
  1502. // Check whether full request is buffered. Return:
  1503. // -1 if request is malformed
  1504. // 0 if request is not yet fully buffered
  1505. // >0 actual request length, including last \r\n\r\n
  1506. static int get_request_len(const char *buf, int buflen) {
  1507. const char *s, *e;
  1508. int len = 0;
  1509. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1510. // Control characters are not allowed but >=128 is.
  1511. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1512. *s != '\n' && * (const unsigned char *) s < 128) {
  1513. len = -1;
  1514. 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
  1515. } else if (s[0] == '\n' && s[1] == '\n') {
  1516. len = (int) (s - buf) + 2;
  1517. } else if (s[0] == '\n' && &s[1] < e &&
  1518. s[1] == '\r' && s[2] == '\n') {
  1519. len = (int) (s - buf) + 3;
  1520. }
  1521. return len;
  1522. }
  1523. // Convert month to the month number. Return -1 on error, or month number
  1524. static int get_month_index(const char *s) {
  1525. size_t i;
  1526. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1527. if (!strcmp(s, month_names[i]))
  1528. return (int) i;
  1529. return -1;
  1530. }
  1531. static int num_leap_years(int year) {
  1532. return year / 4 - year / 100 + year / 400;
  1533. }
  1534. // Parse UTC date-time string, and return the corresponding time_t value.
  1535. static time_t parse_date_string(const char *datetime) {
  1536. static const unsigned short days_before_month[] = {
  1537. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1538. };
  1539. char month_str[32];
  1540. int second, minute, hour, day, month, year, leap_days, days;
  1541. time_t result = (time_t) 0;
  1542. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1543. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1544. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1545. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1546. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1547. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1548. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1549. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1550. year > 1970 &&
  1551. (month = get_month_index(month_str)) != -1) {
  1552. leap_days = num_leap_years(year) - num_leap_years(1970);
  1553. year -= 1970;
  1554. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1555. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1556. }
  1557. return result;
  1558. }
  1559. // Protect against directory disclosure attack by removing '..',
  1560. // excessive '/' and '\' characters
  1561. static void remove_double_dots_and_double_slashes(char *s) {
  1562. char *p = s;
  1563. while (*s != '\0') {
  1564. *p++ = *s++;
  1565. if (s[-1] == '/' || s[-1] == '\\') {
  1566. // Skip all following slashes, backslashes and double-dots
  1567. while (s[0] != '\0') {
  1568. if (s[0] == '/' || s[0] == '\\') {
  1569. s++;
  1570. } else if (s[0] == '.' && s[1] == '.') {
  1571. s += 2;
  1572. } else {
  1573. break;
  1574. }
  1575. }
  1576. }
  1577. }
  1578. *p = '\0';
  1579. }
  1580. static const struct {
  1581. const char *extension;
  1582. size_t ext_len;
  1583. const char *mime_type;
  1584. } builtin_mime_types[] = {
  1585. {".html", 5, "text/html"},
  1586. {".htm", 4, "text/html"},
  1587. {".shtm", 5, "text/html"},
  1588. {".shtml", 6, "text/html"},
  1589. {".css", 4, "text/css"},
  1590. {".js", 3, "application/x-javascript"},
  1591. {".ico", 4, "image/x-icon"},
  1592. {".gif", 4, "image/gif"},
  1593. {".jpg", 4, "image/jpeg"},
  1594. {".jpeg", 5, "image/jpeg"},
  1595. {".png", 4, "image/png"},
  1596. {".svg", 4, "image/svg+xml"},
  1597. {".txt", 4, "text/plain"},
  1598. {".torrent", 8, "application/x-bittorrent"},
  1599. {".wav", 4, "audio/x-wav"},
  1600. {".mp3", 4, "audio/x-mp3"},
  1601. {".mid", 4, "audio/mid"},
  1602. {".m3u", 4, "audio/x-mpegurl"},
  1603. {".ram", 4, "audio/x-pn-realaudio"},
  1604. {".xml", 4, "text/xml"},
  1605. {".json", 5, "text/json"},
  1606. {".xslt", 5, "application/xml"},
  1607. {".ra", 3, "audio/x-pn-realaudio"},
  1608. {".doc", 4, "application/msword"},
  1609. {".exe", 4, "application/octet-stream"},
  1610. {".zip", 4, "application/x-zip-compressed"},
  1611. {".xls", 4, "application/excel"},
  1612. {".tgz", 4, "application/x-tar-gz"},
  1613. {".tar", 4, "application/x-tar"},
  1614. {".gz", 3, "application/x-gunzip"},
  1615. {".arj", 4, "application/x-arj-compressed"},
  1616. {".rar", 4, "application/x-arj-compressed"},
  1617. {".rtf", 4, "application/rtf"},
  1618. {".pdf", 4, "application/pdf"},
  1619. {".swf", 4, "application/x-shockwave-flash"},
  1620. {".mpg", 4, "video/mpeg"},
  1621. {".webm", 5, "video/webm"},
  1622. {".mpeg", 5, "video/mpeg"},
  1623. {".mp4", 4, "video/mp4"},
  1624. {".m4v", 4, "video/x-m4v"},
  1625. {".asf", 4, "video/x-ms-asf"},
  1626. {".avi", 4, "video/x-msvideo"},
  1627. {".bmp", 4, "image/bmp"},
  1628. {NULL, 0, NULL}
  1629. };
  1630. const char *mg_get_builtin_mime_type(const char *path) {
  1631. const char *ext;
  1632. size_t i, path_len;
  1633. path_len = strlen(path);
  1634. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1635. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1636. if (path_len > builtin_mime_types[i].ext_len &&
  1637. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1638. return builtin_mime_types[i].mime_type;
  1639. }
  1640. }
  1641. return "text/plain";
  1642. }
  1643. // Look at the "path" extension and figure what mime type it has.
  1644. // Store mime type in the vector.
  1645. static void get_mime_type(struct mg_context *ctx, const char *path,
  1646. struct vec *vec) {
  1647. struct vec ext_vec, mime_vec;
  1648. const char *list, *ext;
  1649. size_t path_len;
  1650. path_len = strlen(path);
  1651. // Scan user-defined mime types first, in case user wants to
  1652. // override default mime types.
  1653. list = ctx->config[EXTRA_MIME_TYPES];
  1654. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1655. // ext now points to the path suffix
  1656. ext = path + path_len - ext_vec.len;
  1657. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1658. *vec = mime_vec;
  1659. return;
  1660. }
  1661. }
  1662. vec->ptr = mg_get_builtin_mime_type(path);
  1663. vec->len = strlen(vec->ptr);
  1664. }
  1665. #ifndef HAVE_MD5
  1666. typedef struct MD5Context {
  1667. uint32_t buf[4];
  1668. uint32_t bits[2];
  1669. unsigned char in[64];
  1670. } MD5_CTX;
  1671. #if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
  1672. #define byteReverse(buf, len) // Do nothing
  1673. #else
  1674. static void byteReverse(unsigned char *buf, unsigned longs) {
  1675. uint32_t t;
  1676. do {
  1677. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1678. ((unsigned) buf[1] << 8 | buf[0]);
  1679. *(uint32_t *) buf = t;
  1680. buf += 4;
  1681. } while (--longs);
  1682. }
  1683. #endif
  1684. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1685. #define F2(x, y, z) F1(z, x, y)
  1686. #define F3(x, y, z) (x ^ y ^ z)
  1687. #define F4(x, y, z) (y ^ (x | ~z))
  1688. #define MD5STEP(f, w, x, y, z, data, s) \
  1689. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1690. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1691. // initialization constants.
  1692. static void MD5Init(MD5_CTX *ctx) {
  1693. ctx->buf[0] = 0x67452301;
  1694. ctx->buf[1] = 0xefcdab89;
  1695. ctx->buf[2] = 0x98badcfe;
  1696. ctx->buf[3] = 0x10325476;
  1697. ctx->bits[0] = 0;
  1698. ctx->bits[1] = 0;
  1699. }
  1700. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1701. register uint32_t a, b, c, d;
  1702. a = buf[0];
  1703. b = buf[1];
  1704. c = buf[2];
  1705. d = buf[3];
  1706. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1707. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1708. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1709. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1710. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1711. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1712. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1713. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1714. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1715. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1716. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1717. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1718. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1719. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1720. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1721. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1722. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1723. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1724. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1725. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1726. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1727. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1728. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1729. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1730. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1731. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1732. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1733. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1734. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1735. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1736. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1737. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1738. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1739. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1740. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1741. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1742. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1743. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1744. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1745. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1746. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1747. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1748. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1749. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1750. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1751. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1752. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1753. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1754. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1755. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1756. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1757. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1758. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1759. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1760. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1761. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1762. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1763. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1764. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1765. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1766. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1767. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1768. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1769. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1770. buf[0] += a;
  1771. buf[1] += b;
  1772. buf[2] += c;
  1773. buf[3] += d;
  1774. }
  1775. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1776. uint32_t t;
  1777. t = ctx->bits[0];
  1778. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1779. ctx->bits[1]++;
  1780. ctx->bits[1] += len >> 29;
  1781. t = (t >> 3) & 0x3f;
  1782. if (t) {
  1783. unsigned char *p = (unsigned char *) ctx->in + t;
  1784. t = 64 - t;
  1785. if (len < t) {
  1786. memcpy(p, buf, len);
  1787. return;
  1788. }
  1789. memcpy(p, buf, t);
  1790. byteReverse(ctx->in, 16);
  1791. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1792. buf += t;
  1793. len -= t;
  1794. }
  1795. while (len >= 64) {
  1796. memcpy(ctx->in, buf, 64);
  1797. byteReverse(ctx->in, 16);
  1798. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1799. buf += 64;
  1800. len -= 64;
  1801. }
  1802. memcpy(ctx->in, buf, len);
  1803. }
  1804. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1805. unsigned count;
  1806. unsigned char *p;
  1807. count = (ctx->bits[0] >> 3) & 0x3F;
  1808. p = ctx->in + count;
  1809. *p++ = 0x80;
  1810. count = 64 - 1 - count;
  1811. if (count < 8) {
  1812. memset(p, 0, count);
  1813. byteReverse(ctx->in, 16);
  1814. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1815. memset(ctx->in, 0, 56);
  1816. } else {
  1817. memset(p, 0, count - 8);
  1818. }
  1819. byteReverse(ctx->in, 14);
  1820. ((uint32_t *) ctx->in)[14] = ctx->bits[0];
  1821. ((uint32_t *) ctx->in)[15] = ctx->bits[1];
  1822. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1823. byteReverse((unsigned char *) ctx->buf, 4);
  1824. memcpy(digest, ctx->buf, 16);
  1825. memset((char *) ctx, 0, sizeof(*ctx));
  1826. }
  1827. #endif // !HAVE_MD5
  1828. // Stringify binary data. Output buffer must be twice as big as input,
  1829. // because each byte takes 2 bytes in string representation
  1830. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1831. static const char *hex = "0123456789abcdef";
  1832. for (; len--; p++) {
  1833. *to++ = hex[p[0] >> 4];
  1834. *to++ = hex[p[0] & 0x0f];
  1835. }
  1836. *to = '\0';
  1837. }
  1838. // Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
  1839. void mg_md5(char buf[33], ...) {
  1840. unsigned char hash[16];
  1841. const char *p;
  1842. va_list ap;
  1843. MD5_CTX ctx;
  1844. MD5Init(&ctx);
  1845. va_start(ap, buf);
  1846. while ((p = va_arg(ap, const char *)) != NULL) {
  1847. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1848. }
  1849. va_end(ap);
  1850. MD5Final(hash, &ctx);
  1851. bin2str(buf, hash, sizeof(hash));
  1852. }
  1853. // Check the user's password, return 1 if OK
  1854. static int check_password(const char *method, const char *ha1, const char *uri,
  1855. const char *nonce, const char *nc, const char *cnonce,
  1856. const char *qop, const char *response) {
  1857. char ha2[32 + 1], expected_response[32 + 1];
  1858. // Some of the parameters may be NULL
  1859. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1860. qop == NULL || response == NULL) {
  1861. return 0;
  1862. }
  1863. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1864. // TODO(lsm): check for authentication timeout
  1865. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1866. strlen(response) != 32
  1867. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1868. ) {
  1869. return 0;
  1870. }
  1871. mg_md5(ha2, method, ":", uri, NULL);
  1872. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1873. ":", cnonce, ":", qop, ":", ha2, NULL);
  1874. return mg_strcasecmp(response, expected_response) == 0;
  1875. }
  1876. // Use the global passwords file, if specified by auth_gpass option,
  1877. // or search for .htpasswd in the requested directory.
  1878. static FILE *open_auth_file(struct mg_connection *conn, const char *path) {
  1879. struct mg_context *ctx = conn->ctx;
  1880. char name[PATH_MAX];
  1881. const char *p, *e;
  1882. struct mgstat st;
  1883. FILE *fp;
  1884. if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) {
  1885. // Use global passwords file
  1886. fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r");
  1887. if (fp == NULL)
  1888. cry(fc(ctx), "fopen(%s): %s",
  1889. ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO));
  1890. } else if (!mg_stat(path, &st) && st.is_directory) {
  1891. (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1892. path, '/', PASSWORDS_FILE_NAME);
  1893. fp = mg_fopen(name, "r");
  1894. } else {
  1895. // Try to find .htpasswd in requested directory.
  1896. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1897. if (e[0] == '/')
  1898. break;
  1899. (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1900. (int) (e - p), p, '/', PASSWORDS_FILE_NAME);
  1901. fp = mg_fopen(name, "r");
  1902. }
  1903. return fp;
  1904. }
  1905. // Parsed Authorization header
  1906. struct ah {
  1907. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1908. };
  1909. // Return 1 on success. Always initializes the ah structure.
  1910. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1911. size_t buf_size, struct ah *ah) {
  1912. char *name, *value, *s;
  1913. const char *auth_header;
  1914. (void) memset(ah, 0, sizeof(*ah));
  1915. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  1916. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  1917. return 0;
  1918. }
  1919. // Make modifiable copy of the auth header
  1920. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  1921. s = buf;
  1922. // Parse authorization header
  1923. for (;;) {
  1924. // Gobble initial spaces
  1925. while (isspace(* (unsigned char *) s)) {
  1926. s++;
  1927. }
  1928. name = skip_quoted(&s, "=", " ", 0);
  1929. // Value is either quote-delimited, or ends at first comma or space.
  1930. if (s[0] == '\"') {
  1931. s++;
  1932. value = skip_quoted(&s, "\"", " ", '\\');
  1933. if (s[0] == ',') {
  1934. s++;
  1935. }
  1936. } else {
  1937. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  1938. }
  1939. if (*name == '\0') {
  1940. break;
  1941. }
  1942. if (!strcmp(name, "username")) {
  1943. ah->user = value;
  1944. } else if (!strcmp(name, "cnonce")) {
  1945. ah->cnonce = value;
  1946. } else if (!strcmp(name, "response")) {
  1947. ah->response = value;
  1948. } else if (!strcmp(name, "uri")) {
  1949. ah->uri = value;
  1950. } else if (!strcmp(name, "qop")) {
  1951. ah->qop = value;
  1952. } else if (!strcmp(name, "nc")) {
  1953. ah->nc = value;
  1954. } else if (!strcmp(name, "nonce")) {
  1955. ah->nonce = value;
  1956. }
  1957. }
  1958. // CGI needs it as REMOTE_USER
  1959. if (ah->user != NULL) {
  1960. conn->request_info.remote_user = mg_strdup(ah->user);
  1961. } else {
  1962. return 0;
  1963. }
  1964. return 1;
  1965. }
  1966. // Authorize against the opened passwords file. Return 1 if authorized.
  1967. static int authorize(struct mg_connection *conn, FILE *fp) {
  1968. struct ah ah;
  1969. char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN];
  1970. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  1971. return 0;
  1972. }
  1973. // Loop over passwords file
  1974. while (fgets(line, sizeof(line), fp) != NULL) {
  1975. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  1976. continue;
  1977. }
  1978. if (!strcmp(ah.user, f_user) &&
  1979. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  1980. return check_password(
  1981. conn->request_info.request_method,
  1982. ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
  1983. ah.response);
  1984. }
  1985. return 0;
  1986. }
  1987. // Return 1 if request is authorised, 0 otherwise.
  1988. static int check_authorization(struct mg_connection *conn, const char *path) {
  1989. FILE *fp;
  1990. char fname[PATH_MAX];
  1991. struct vec uri_vec, filename_vec;
  1992. const char *list;
  1993. int authorized;
  1994. fp = NULL;
  1995. authorized = 1;
  1996. list = conn->ctx->config[PROTECT_URI];
  1997. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  1998. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  1999. mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  2000. (int) filename_vec.len, filename_vec.ptr);
  2001. if ((fp = mg_fopen(fname, "r")) == NULL) {
  2002. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  2003. }
  2004. break;
  2005. }
  2006. }
  2007. if (fp == NULL) {
  2008. fp = open_auth_file(conn, path);
  2009. }
  2010. if (fp != NULL) {
  2011. authorized = authorize(conn, fp);
  2012. (void) fclose(fp);
  2013. }
  2014. return authorized;
  2015. }
  2016. static void send_authorization_request(struct mg_connection *conn) {
  2017. conn->status_code = 401;
  2018. (void) mg_printf(conn,
  2019. "HTTP/1.1 401 Unauthorized\r\n"
  2020. "Content-Length: 0\r\n"
  2021. "WWW-Authenticate: Digest qop=\"auth\", "
  2022. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  2023. conn->ctx->config[AUTHENTICATION_DOMAIN],
  2024. (unsigned long) time(NULL));
  2025. }
  2026. static int is_authorized_for_put(struct mg_connection *conn) {
  2027. FILE *fp;
  2028. int ret = 0;
  2029. fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL :
  2030. mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r");
  2031. if (fp != NULL) {
  2032. ret = authorize(conn, fp);
  2033. (void) fclose(fp);
  2034. }
  2035. return ret;
  2036. }
  2037. int mg_modify_passwords_file(const char *fname, const char *domain,
  2038. const char *user, const char *pass) {
  2039. int found;
  2040. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  2041. FILE *fp, *fp2;
  2042. found = 0;
  2043. fp = fp2 = NULL;
  2044. // Regard empty password as no password - remove user record.
  2045. if (pass != NULL && pass[0] == '\0') {
  2046. pass = NULL;
  2047. }
  2048. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  2049. // Create the file if does not exist
  2050. if ((fp = mg_fopen(fname, "a+")) != NULL) {
  2051. (void) fclose(fp);
  2052. }
  2053. // Open the given file and temporary file
  2054. if ((fp = mg_fopen(fname, "r")) == NULL) {
  2055. return 0;
  2056. } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
  2057. fclose(fp);
  2058. return 0;
  2059. }
  2060. // Copy the stuff to temporary file
  2061. while (fgets(line, sizeof(line), fp) != NULL) {
  2062. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  2063. continue;
  2064. }
  2065. if (!strcmp(u, user) && !strcmp(d, domain)) {
  2066. found++;
  2067. if (pass != NULL) {
  2068. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2069. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2070. }
  2071. } else {
  2072. (void) fprintf(fp2, "%s", line);
  2073. }
  2074. }
  2075. // If new user, just add it
  2076. if (!found && pass != NULL) {
  2077. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  2078. (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  2079. }
  2080. // Close files
  2081. (void) fclose(fp);
  2082. (void) fclose(fp2);
  2083. // Put the temp file in place of real file
  2084. (void) mg_remove(fname);
  2085. (void) mg_rename(tmp, fname);
  2086. return 1;
  2087. }
  2088. struct de {
  2089. struct mg_connection *conn;
  2090. char *file_name;
  2091. struct mgstat st;
  2092. };
  2093. static void url_encode(const char *src, char *dst, size_t dst_len) {
  2094. static const char *dont_escape = "._-$,;~()";
  2095. static const char *hex = "0123456789abcdef";
  2096. const char *end = dst + dst_len - 1;
  2097. for (; *src != '\0' && dst < end; src++, dst++) {
  2098. if (isalnum(*(const unsigned char *) src) ||
  2099. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  2100. *dst = *src;
  2101. } else if (dst + 2 < end) {
  2102. dst[0] = '%';
  2103. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  2104. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  2105. dst += 2;
  2106. }
  2107. }
  2108. *dst = '\0';
  2109. }
  2110. static void print_dir_entry(struct de *de) {
  2111. char size[64], mod[64], href[PATH_MAX];
  2112. if (de->st.is_directory) {
  2113. (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  2114. } else {
  2115. // We use (signed) cast below because MSVC 6 compiler cannot
  2116. // convert unsigned __int64 to double. Sigh.
  2117. if (de->st.size < 1024) {
  2118. (void) mg_snprintf(de->conn, size, sizeof(size),
  2119. "%lu", (unsigned long) de->st.size);
  2120. } else if (de->st.size < 0x100000) {
  2121. (void) mg_snprintf(de->conn, size, sizeof(size),
  2122. "%.1fk", (double) de->st.size / 1024.0);
  2123. } else if (de->st.size < 0x40000000) {
  2124. (void) mg_snprintf(de->conn, size, sizeof(size),
  2125. "%.1fM", (double) de->st.size / 1048576);
  2126. } else {
  2127. (void) mg_snprintf(de->conn, size, sizeof(size),
  2128. "%.1fG", (double) de->st.size / 1073741824);
  2129. }
  2130. }
  2131. (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime));
  2132. url_encode(de->file_name, href, sizeof(href));
  2133. de->conn->num_bytes_sent += mg_printf(de->conn,
  2134. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  2135. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2136. de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
  2137. de->file_name, de->st.is_directory ? "/" : "", mod, size);
  2138. }
  2139. // This function is called from send_directory() and used for
  2140. // sorting directory entries by size, or name, or modification time.
  2141. // On windows, __cdecl specification is needed in case if project is built
  2142. // with __stdcall convention. qsort always requires __cdels callback.
  2143. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  2144. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  2145. const char *query_string = a->conn->request_info.query_string;
  2146. int cmp_result = 0;
  2147. if (query_string == NULL) {
  2148. query_string = "na";
  2149. }
  2150. if (a->st.is_directory && !b->st.is_directory) {
  2151. return -1; // Always put directories on top
  2152. } else if (!a->st.is_directory && b->st.is_directory) {
  2153. return 1; // Always put directories on top
  2154. } else if (*query_string == 'n') {
  2155. cmp_result = strcmp(a->file_name, b->file_name);
  2156. } else if (*query_string == 's') {
  2157. cmp_result = a->st.size == b->st.size ? 0 :
  2158. a->st.size > b->st.size ? 1 : -1;
  2159. } else if (*query_string == 'd') {
  2160. cmp_result = a->st.mtime == b->st.mtime ? 0 :
  2161. a->st.mtime > b->st.mtime ? 1 : -1;
  2162. }
  2163. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2164. }
  2165. static int must_hide_file(struct mg_connection *conn, const char *path) {
  2166. const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
  2167. const char *pattern = conn->ctx->config[HIDE_FILES];
  2168. return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
  2169. (pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
  2170. }
  2171. static int scan_directory(struct mg_connection *conn, const char *dir,
  2172. void *data, void (*cb)(struct de *, void *)) {
  2173. char path[PATH_MAX];
  2174. struct dirent *dp;
  2175. DIR *dirp;
  2176. struct de de;
  2177. if ((dirp = opendir(dir)) == NULL) {
  2178. return 0;
  2179. } else {
  2180. de.conn = conn;
  2181. while ((dp = readdir(dirp)) != NULL) {
  2182. // Do not show current dir and hidden files
  2183. if (!strcmp(dp->d_name, ".") ||
  2184. !strcmp(dp->d_name, "..") ||
  2185. must_hide_file(conn, dp->d_name)) {
  2186. continue;
  2187. }
  2188. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
  2189. // If we don't memset stat structure to zero, mtime will have
  2190. // garbage and strftime() will segfault later on in
  2191. // print_dir_entry(). memset is required only if mg_stat()
  2192. // fails. For more details, see
  2193. // http://code.google.com/p/mongoose/issues/detail?id=79
  2194. if (mg_stat(path, &de.st) != 0) {
  2195. memset(&de.st, 0, sizeof(de.st));
  2196. }
  2197. de.file_name = dp->d_name;
  2198. cb(&de, data);
  2199. }
  2200. (void) closedir(dirp);
  2201. }
  2202. return 1;
  2203. }
  2204. struct dir_scan_data {
  2205. struct de *entries;
  2206. int num_entries;
  2207. int arr_size;
  2208. };
  2209. static void dir_scan_callback(struct de *de, void *data) {
  2210. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2211. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2212. dsd->arr_size *= 2;
  2213. dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
  2214. sizeof(dsd->entries[0]));
  2215. }
  2216. if (dsd->entries == NULL) {
  2217. // TODO(lsm): propagate an error to the caller
  2218. dsd->num_entries = 0;
  2219. } else {
  2220. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2221. dsd->entries[dsd->num_entries].st = de->st;
  2222. dsd->entries[dsd->num_entries].conn = de->conn;
  2223. dsd->num_entries++;
  2224. }
  2225. }
  2226. static void handle_directory_request(struct mg_connection *conn,
  2227. const char *dir) {
  2228. int i, sort_direction;
  2229. struct dir_scan_data data = { NULL, 0, 128 };
  2230. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2231. send_http_error(conn, 500, "Cannot open directory",
  2232. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2233. return;
  2234. }
  2235. sort_direction = conn->request_info.query_string != NULL &&
  2236. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2237. conn->must_close = 1;
  2238. mg_printf(conn, "%s",
  2239. "HTTP/1.1 200 OK\r\n"
  2240. "Connection: close\r\n"
  2241. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2242. conn->num_bytes_sent += mg_printf(conn,
  2243. "<html><head><title>Index of %s</title>"
  2244. "<style>th {text-align: left;}</style></head>"
  2245. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2246. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2247. "<th><a href=\"?d%c\">Modified</a></th>"
  2248. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2249. "<tr><td colspan=\"3\"><hr></td></tr>",
  2250. conn->request_info.uri, conn->request_info.uri,
  2251. sort_direction, sort_direction, sort_direction);
  2252. // Print first entry - link to a parent directory
  2253. conn->num_bytes_sent += mg_printf(conn,
  2254. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2255. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2256. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2257. // Sort and print directory entries
  2258. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2259. compare_dir_entries);
  2260. for (i = 0; i < data.num_entries; i++) {
  2261. print_dir_entry(&data.entries[i]);
  2262. free(data.entries[i].file_name);
  2263. }
  2264. free(data.entries);
  2265. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2266. conn->status_code = 200;
  2267. }
  2268. // Send len bytes from the opened file to the client.
  2269. static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
  2270. char buf[MG_BUF_LEN];
  2271. int to_read, num_read, num_written;
  2272. while (len > 0) {
  2273. // Calculate how much to read from the file in the buffer
  2274. to_read = sizeof(buf);
  2275. if ((int64_t) to_read > len) {
  2276. to_read = (int) len;
  2277. }
  2278. // Read from file, exit the loop on error
  2279. if ((num_read = fread(buf, 1, (size_t)to_read, fp)) <= 0) {
  2280. break;
  2281. }
  2282. // Send read bytes to the client, exit the loop on error
  2283. if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read) {
  2284. break;
  2285. }
  2286. // Both read and were successful, adjust counters
  2287. conn->num_bytes_sent += num_written;
  2288. len -= num_written;
  2289. }
  2290. }
  2291. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2292. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2293. }
  2294. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2295. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2296. }
  2297. static void construct_etag(char *buf, size_t buf_len,
  2298. const struct mgstat *stp) {
  2299. snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
  2300. (unsigned long) stp->mtime, stp->size);
  2301. }
  2302. static void handle_file_request(struct mg_connection *conn, const char *path,
  2303. struct mgstat *stp) {
  2304. char date[64], lm[64], etag[64], range[64];
  2305. const char *msg = "OK", *hdr;
  2306. time_t curtime = time(NULL);
  2307. int64_t cl, r1, r2;
  2308. struct vec mime_vec;
  2309. FILE *fp;
  2310. int n;
  2311. get_mime_type(conn->ctx, path, &mime_vec);
  2312. cl = stp->size;
  2313. conn->status_code = 200;
  2314. range[0] = '\0';
  2315. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2316. send_http_error(conn, 500, http_500_error,
  2317. "fopen(%s): %s", path, strerror(ERRNO));
  2318. return;
  2319. }
  2320. set_close_on_exec(fileno(fp));
  2321. // If Range: header specified, act accordingly
  2322. r1 = r2 = 0;
  2323. hdr = mg_get_header(conn, "Range");
  2324. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
  2325. conn->status_code = 206;
  2326. (void) fseeko(fp, r1, SEEK_SET);
  2327. cl = n == 2 ? r2 - r1 + 1: cl - r1;
  2328. (void) mg_snprintf(conn, range, sizeof(range),
  2329. "Content-Range: bytes "
  2330. "%" INT64_FMT "-%"
  2331. INT64_FMT "/%" INT64_FMT "\r\n",
  2332. r1, r1 + cl - 1, stp->size);
  2333. msg = "Partial Content";
  2334. }
  2335. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2336. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2337. gmt_time_string(date, sizeof(date), &curtime);
  2338. gmt_time_string(lm, sizeof(lm), &stp->mtime);
  2339. construct_etag(etag, sizeof(etag), stp);
  2340. (void) mg_printf(conn,
  2341. "HTTP/1.1 %d %s\r\n"
  2342. "Date: %s\r\n"
  2343. "Last-Modified: %s\r\n"
  2344. "Etag: %s\r\n"
  2345. "Content-Type: %.*s\r\n"
  2346. "Content-Length: %" INT64_FMT "\r\n"
  2347. "Connection: %s\r\n"
  2348. "Accept-Ranges: bytes\r\n"
  2349. "%s\r\n",
  2350. conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
  2351. mime_vec.ptr, cl, suggest_connection_header(conn), range);
  2352. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2353. send_file_data(conn, fp, cl);
  2354. }
  2355. (void) fclose(fp);
  2356. }
  2357. void mg_send_file(struct mg_connection *conn, const char *path) {
  2358. struct mgstat st;
  2359. if (mg_stat(path, &st) == 0) {
  2360. handle_file_request(conn, path, &st);
  2361. } else {
  2362. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2363. }
  2364. }
  2365. // Parse HTTP headers from the given buffer, advance buffer to the point
  2366. // where parsing stopped.
  2367. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2368. int i;
  2369. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2370. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2371. ri->http_headers[i].value = skip(buf, "\r\n");
  2372. if (ri->http_headers[i].name[0] == '\0')
  2373. break;
  2374. ri->num_headers = i + 1;
  2375. }
  2376. }
  2377. static int is_valid_http_method(const char *method) {
  2378. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2379. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2380. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2381. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
  2382. }
  2383. // Parse HTTP request, fill in mg_request_info structure.
  2384. // This function modifies the buffer by NUL-terminating
  2385. // HTTP request components, header names and header values.
  2386. static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
  2387. int request_length = get_request_len(buf, len);
  2388. if (request_length > 0) {
  2389. // Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  2390. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  2391. ri->num_headers = 0;
  2392. buf[request_length - 1] = '\0';
  2393. // RFC says that all initial whitespaces should be ingored
  2394. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2395. buf++;
  2396. }
  2397. ri->request_method = skip(&buf, " ");
  2398. ri->uri = skip(&buf, " ");
  2399. ri->http_version = skip(&buf, "\r\n");
  2400. parse_http_headers(&buf, ri);
  2401. }
  2402. return request_length;
  2403. }
  2404. static int parse_http_request(char *buf, int len, struct mg_request_info *ri) {
  2405. int result = parse_http_message(buf, len, ri);
  2406. if (result > 0 &&
  2407. is_valid_http_method(ri->request_method) &&
  2408. !strncmp(ri->http_version, "HTTP/", 5)) {
  2409. ri->http_version += 5; // Skip "HTTP/"
  2410. } else {
  2411. result = -1;
  2412. }
  2413. return result;
  2414. }
  2415. static int parse_http_response(char *buf, int len, struct mg_request_info *ri) {
  2416. int result = parse_http_message(buf, len, ri);
  2417. return result > 0 && !strncmp(ri->request_method, "HTTP/", 5) ? result : -1;
  2418. }
  2419. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2420. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2421. // buffer (which marks the end of HTTP request). Buffer buf may already
  2422. // have some data. The length of the data is stored in nread.
  2423. // Upon every read operation, increase nread by the number of bytes read.
  2424. static int read_request(FILE *fp, struct mg_connection *conn,
  2425. char *buf, int bufsiz, int *nread) {
  2426. int request_len, n = 1;
  2427. request_len = get_request_len(buf, *nread);
  2428. while (*nread < bufsiz && request_len == 0 && n > 0) {
  2429. n = pull(fp, conn, buf + *nread, bufsiz - *nread);
  2430. if (n > 0) {
  2431. *nread += n;
  2432. request_len = get_request_len(buf, *nread);
  2433. }
  2434. }
  2435. if (n < 0) {
  2436. // recv() error -> propagate error; do not process a b0rked-with-very-high-probability request
  2437. return -1;
  2438. }
  2439. return request_len;
  2440. }
  2441. // For given directory path, substitute it to valid index file.
  2442. // Return 0 if index file has been found, -1 if not found.
  2443. // If the file is found, it's stats is returned in stp.
  2444. static int substitute_index_file(struct mg_connection *conn, char *path,
  2445. size_t path_len, struct mgstat *stp) {
  2446. const char *list = conn->ctx->config[INDEX_FILES];
  2447. struct mgstat st;
  2448. struct vec filename_vec;
  2449. size_t n = strlen(path);
  2450. int found = 0;
  2451. // The 'path' given to us points to the directory. Remove all trailing
  2452. // directory separator characters from the end of the path, and
  2453. // then append single directory separator character.
  2454. while (n > 0 && path[n - 1] == '/') {
  2455. n--;
  2456. }
  2457. path[n] = '/';
  2458. // Traverse index files list. For each entry, append it to the given
  2459. // path and see if the file exists. If it exists, break the loop
  2460. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2461. // Ignore too long entries that may overflow path buffer
  2462. if (filename_vec.len > path_len - (n + 2))
  2463. continue;
  2464. // Prepare full path to the index file
  2465. (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2466. // Does it exist?
  2467. if (mg_stat(path, &st) == 0) {
  2468. // Yes it does, break the loop
  2469. *stp = st;
  2470. found = 1;
  2471. break;
  2472. }
  2473. }
  2474. // If no index file exists, restore directory path
  2475. if (!found) {
  2476. path[n] = '\0';
  2477. }
  2478. return found;
  2479. }
  2480. // Return True if we should reply 304 Not Modified.
  2481. static int is_not_modified(const struct mg_connection *conn,
  2482. const struct mgstat *stp) {
  2483. char etag[64];
  2484. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2485. const char *inm = mg_get_header(conn, "If-None-Match");
  2486. construct_etag(etag, sizeof(etag), stp);
  2487. return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
  2488. (ims != NULL && stp->mtime <= parse_date_string(ims));
  2489. }
  2490. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2491. SOCKET sock, SSL *ssl) {
  2492. const char *expect, *body;
  2493. char buf[MG_BUF_LEN];
  2494. int to_read, nread, buffered_len, success = 0;
  2495. expect = mg_get_header(conn, "Expect");
  2496. assert(fp != NULL);
  2497. if (conn->content_len == -1) {
  2498. send_http_error(conn, 411, "Length Required", "%s", "");
  2499. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2500. send_http_error(conn, 417, "Expectation Failed", "%s", "");
  2501. } else {
  2502. if (expect != NULL) {
  2503. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2504. }
  2505. body = conn->buf + conn->request_len + conn->consumed_content;
  2506. buffered_len = &conn->buf[conn->data_len] - body;
  2507. assert(buffered_len >= 0);
  2508. assert(conn->consumed_content == 0);
  2509. if (buffered_len > 0) {
  2510. if ((int64_t) buffered_len > conn->content_len) {
  2511. buffered_len = (int) conn->content_len;
  2512. }
  2513. push(fp, sock, ssl, body, (int64_t) buffered_len);
  2514. conn->consumed_content += buffered_len;
  2515. }
  2516. nread = 0;
  2517. while (conn->consumed_content < conn->content_len) {
  2518. to_read = sizeof(buf);
  2519. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2520. to_read = (int) (conn->content_len - conn->consumed_content);
  2521. }
  2522. nread = pull(NULL, conn, buf, to_read);
  2523. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2524. break;
  2525. }
  2526. conn->consumed_content += nread;
  2527. }
  2528. if (conn->consumed_content == conn->content_len) {
  2529. success = nread >= 0;
  2530. }
  2531. // Each error code path in this function must send an error
  2532. if (!success) {
  2533. send_http_error(conn, 577, http_500_error, "%s", "");
  2534. }
  2535. }
  2536. return success;
  2537. }
  2538. #if !defined(NO_CGI)
  2539. // This structure helps to create an environment for the spawned CGI program.
  2540. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2541. // last element must be NULL.
  2542. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2543. // strings must reside in a contiguous buffer. The end of the buffer is
  2544. // marked by two '\0' characters.
  2545. // We satisfy both worlds: we create an envp array (which is vars), all
  2546. // entries are actually pointers inside buf.
  2547. struct cgi_env_block {
  2548. struct mg_connection *conn;
  2549. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2550. int len; // Space taken
  2551. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2552. int nvars; // Number of variables
  2553. };
  2554. static char *addenv(struct cgi_env_block *block,
  2555. PRINTF_FORMAT_STRING(const char *fmt), ...)
  2556. PRINTF_ARGS(2, 3);
  2557. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2558. // pointer into the vars array.
  2559. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2560. int n, space;
  2561. char *added;
  2562. va_list ap;
  2563. // Calculate how much space is left in the buffer
  2564. space = sizeof(block->buf) - block->len - 2;
  2565. assert(space >= 0);
  2566. // Make a pointer to the free space int the buffer
  2567. added = block->buf + block->len;
  2568. // Copy VARIABLE=VALUE\0 string into the free space
  2569. va_start(ap, fmt);
  2570. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2571. va_end(ap);
  2572. // Make sure we do not overflow buffer and the envp array
  2573. if (n > 0 && n + 1 < space &&
  2574. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2575. // Append a pointer to the added string into the envp array
  2576. block->vars[block->nvars++] = added;
  2577. // Bump up used length counter. Include \0 terminator
  2578. block->len += n + 1;
  2579. } else {
  2580. cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
  2581. }
  2582. return added;
  2583. }
  2584. static void prepare_cgi_environment(struct mg_connection *conn,
  2585. const char *prog,
  2586. struct cgi_env_block *blk) {
  2587. const char *s, *slash;
  2588. struct vec var_vec;
  2589. char *p, src_addr[20];
  2590. int i;
  2591. blk->len = blk->nvars = 0;
  2592. blk->conn = conn;
  2593. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  2594. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2595. addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2596. addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
  2597. // Prepare the environment block
  2598. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2599. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2600. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2601. // TODO(lsm): fix this for IPv6 case
  2602. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
  2603. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2604. addenv(blk, "REMOTE_ADDR=%s", src_addr);
  2605. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2606. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2607. // SCRIPT_NAME
  2608. assert(conn->request_info.uri[0] == '/');
  2609. slash = strrchr(conn->request_info.uri, '/');
  2610. if ((s = strrchr(prog, '/')) == NULL)
  2611. s = prog;
  2612. addenv(blk, "SCRIPT_NAME=%.*s%s", (int) (slash - conn->request_info.uri),
  2613. conn->request_info.uri, s);
  2614. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2615. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2616. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2617. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2618. addenv(blk, "CONTENT_TYPE=%s", s);
  2619. if (conn->request_info.query_string != NULL)
  2620. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2621. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2622. addenv(blk, "CONTENT_LENGTH=%s", s);
  2623. if ((s = getenv("PATH")) != NULL)
  2624. addenv(blk, "PATH=%s", s);
  2625. if (conn->path_info != NULL) {
  2626. addenv(blk, "PATH_INFO=%s", conn->path_info);
  2627. }
  2628. #if defined(_WIN32)
  2629. if ((s = getenv("COMSPEC")) != NULL) {
  2630. addenv(blk, "COMSPEC=%s", s);
  2631. }
  2632. if ((s = getenv("SYSTEMROOT")) != NULL) {
  2633. addenv(blk, "SYSTEMROOT=%s", s);
  2634. }
  2635. if ((s = getenv("SystemDrive")) != NULL) {
  2636. addenv(blk, "SystemDrive=%s", s);
  2637. }
  2638. #else
  2639. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2640. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2641. #endif // _WIN32
  2642. if ((s = getenv("PERLLIB")) != NULL)
  2643. addenv(blk, "PERLLIB=%s", s);
  2644. if (conn->request_info.remote_user != NULL) {
  2645. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2646. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2647. }
  2648. // Add all headers as HTTP_* variables
  2649. for (i = 0; i < conn->request_info.num_headers; i++) {
  2650. p = addenv(blk, "HTTP_%s=%s",
  2651. conn->request_info.http_headers[i].name,
  2652. conn->request_info.http_headers[i].value);
  2653. // Convert variable name into uppercase, and change - to _
  2654. for (; *p != '=' && *p != '\0'; p++) {
  2655. if (*p == '-')
  2656. *p = '_';
  2657. *p = (char) toupper(* (unsigned char *) p);
  2658. }
  2659. }
  2660. // Add user-specified variables
  2661. s = conn->ctx->config[CGI_ENVIRONMENT];
  2662. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2663. addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
  2664. }
  2665. blk->vars[blk->nvars++] = NULL;
  2666. blk->buf[blk->len++] = '\0';
  2667. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2668. assert(blk->len > 0);
  2669. assert(blk->len < (int) sizeof(blk->buf));
  2670. }
  2671. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2672. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2673. const char *status, *status_text;
  2674. char buf[16384], *pbuf, dir[PATH_MAX], *p;
  2675. struct mg_request_info ri;
  2676. struct cgi_env_block blk;
  2677. FILE *in, *out;
  2678. pid_t pid;
  2679. prepare_cgi_environment(conn, prog, &blk);
  2680. // CGI must be executed in its own directory. 'dir' must point to the
  2681. // directory containing executable program, 'p' must point to the
  2682. // executable program name relative to 'dir'.
  2683. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2684. if ((p = strrchr(dir, '/')) != NULL) {
  2685. *p++ = '\0';
  2686. } else {
  2687. dir[0] = '.', dir[1] = '\0';
  2688. p = (char *) prog;
  2689. }
  2690. pid = (pid_t) -1;
  2691. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2692. in = out = NULL;
  2693. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2694. send_http_error(conn, 500, http_500_error,
  2695. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2696. goto done;
  2697. } else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
  2698. fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
  2699. send_http_error(conn, 500, http_500_error,
  2700. "Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
  2701. goto done;
  2702. }
  2703. // spawn_process() must close those!
  2704. // If we don't mark them as closed, close() attempt before
  2705. // return from this function throws an exception on Windows.
  2706. // Windows does not like when closed descriptor is closed again.
  2707. fd_stdin[0] = fd_stdout[1] = -1;
  2708. if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2709. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2710. send_http_error(conn, 500, http_500_error,
  2711. "fopen: %s", strerror(ERRNO));
  2712. goto done;
  2713. }
  2714. setbuf(in, NULL);
  2715. setbuf(out, NULL);
  2716. // Send POST data to the CGI process if needed
  2717. if (!strcmp(conn->request_info.request_method, "POST") &&
  2718. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2719. goto done;
  2720. }
  2721. // Close so child gets an EOF.
  2722. fclose(in);
  2723. in = NULL;
  2724. fd_stdin[1] = -1;
  2725. // Now read CGI reply into a buffer. We need to set correct
  2726. // status code, thus we need to see all HTTP headers first.
  2727. // Do not send anything back to client, until we buffer in all
  2728. // HTTP headers.
  2729. data_len = 0;
  2730. headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
  2731. if (headers_len <= 0) {
  2732. send_http_error(conn, 500, http_500_error,
  2733. "CGI program sent malformed or too big (>%u bytes) "
  2734. "HTTP headers: [%.*s]",
  2735. (unsigned) sizeof(buf), data_len, buf);
  2736. goto done;
  2737. }
  2738. pbuf = buf;
  2739. buf[headers_len - 1] = '\0';
  2740. parse_http_headers(&pbuf, &ri);
  2741. // Make up and send the status line
  2742. status_text = "OK";
  2743. if ((status = get_header(&ri, "Status")) != NULL) {
  2744. conn->status_code = atoi(status);
  2745. status_text = status;
  2746. while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
  2747. status_text++;
  2748. }
  2749. } else if (get_header(&ri, "Location") != NULL) {
  2750. conn->status_code = 302;
  2751. } else {
  2752. conn->status_code = 200;
  2753. }
  2754. if (get_header(&ri, "Connection") != NULL &&
  2755. !mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
  2756. conn->must_close = 1;
  2757. }
  2758. (void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
  2759. status_text);
  2760. // Send headers
  2761. for (i = 0; i < ri.num_headers; i++) {
  2762. mg_printf(conn, "%s: %s\r\n",
  2763. ri.http_headers[i].name, ri.http_headers[i].value);
  2764. }
  2765. (void) mg_write(conn, "\r\n", 2);
  2766. // Send chunk of data that may have been read after the headers
  2767. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2768. (size_t)(data_len - headers_len));
  2769. // Read the rest of CGI output and send to the client
  2770. send_file_data(conn, out, INT64_MAX);
  2771. done:
  2772. if (pid != (pid_t) -1) {
  2773. kill(pid, SIGKILL);
  2774. }
  2775. if (fd_stdin[0] != -1) {
  2776. (void) close(fd_stdin[0]);
  2777. }
  2778. if (fd_stdout[1] != -1) {
  2779. (void) close(fd_stdout[1]);
  2780. }
  2781. if (in != NULL) {
  2782. (void) fclose(in);
  2783. } else if (fd_stdin[1] != -1) {
  2784. (void) close(fd_stdin[1]);
  2785. }
  2786. if (out != NULL) {
  2787. (void) fclose(out);
  2788. } else if (fd_stdout[0] != -1) {
  2789. (void) close(fd_stdout[0]);
  2790. }
  2791. }
  2792. #endif // !NO_CGI
  2793. // For a given PUT path, create all intermediate subdirectories
  2794. // for given path. Return 0 if the path itself is a directory,
  2795. // or -1 on error, 1 if OK.
  2796. static int put_dir(const char *path) {
  2797. char buf[PATH_MAX];
  2798. const char *s, *p;
  2799. struct mgstat st;
  2800. int len, res = 1;
  2801. for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
  2802. len = p - path;
  2803. if (len >= (int) sizeof(buf)) {
  2804. res = -1;
  2805. break;
  2806. }
  2807. memcpy(buf, path, len);
  2808. buf[len] = '\0';
  2809. // Try to create intermediate directory
  2810. DEBUG_TRACE(("mkdir(%s)", buf));
  2811. if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) {
  2812. res = -1;
  2813. break;
  2814. }
  2815. // Is path itself a directory?
  2816. if (p[1] == '\0') {
  2817. res = 0;
  2818. }
  2819. }
  2820. return res;
  2821. }
  2822. static void put_file(struct mg_connection *conn, const char *path) {
  2823. struct mgstat st;
  2824. const char *range;
  2825. int64_t r1, r2;
  2826. FILE *fp;
  2827. int rc;
  2828. conn->status_code = mg_stat(path, &st) == 0 ? 200 : 201;
  2829. if ((rc = put_dir(path)) == 0) {
  2830. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2831. } else if (rc == -1) {
  2832. send_http_error(conn, 500, http_500_error,
  2833. "put_dir(%s): %s", path, strerror(ERRNO));
  2834. } else if ((fp = mg_fopen(path, "wb+")) == NULL) {
  2835. send_http_error(conn, 500, http_500_error,
  2836. "fopen(%s): %s", path, strerror(ERRNO));
  2837. } else {
  2838. set_close_on_exec(fileno(fp));
  2839. range = mg_get_header(conn, "Content-Range");
  2840. r1 = r2 = 0;
  2841. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  2842. conn->status_code = 206;
  2843. // TODO(lsm): handle seek error
  2844. (void) fseeko(fp, r1, SEEK_SET);
  2845. }
  2846. if (forward_body_data(conn, fp, INVALID_SOCKET, NULL)) {
  2847. (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
  2848. }
  2849. (void) fclose(fp);
  2850. }
  2851. }
  2852. static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);
  2853. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  2854. char *tag, int include_level) {
  2855. char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
  2856. FILE *fp;
  2857. // sscanf() is safe here, since send_ssi_file() also uses buffer
  2858. // of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
  2859. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  2860. // File name is relative to the webserver root
  2861. (void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
  2862. conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
  2863. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
  2864. // File name is relative to the webserver working directory
  2865. // or it is absolute system path
  2866. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  2867. } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  2868. // File name is relative to the currect document
  2869. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  2870. if ((p = strrchr(path, '/')) != NULL) {
  2871. p[1] = '\0';
  2872. }
  2873. (void) mg_snprintf(conn, path + strlen(path),
  2874. sizeof(path) - strlen(path), "%s", file_name);
  2875. } else {
  2876. cry(conn, "Bad SSI #include: [%s]", tag);
  2877. return;
  2878. }
  2879. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2880. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  2881. tag, path, strerror(ERRNO));
  2882. } else {
  2883. set_close_on_exec(fileno(fp));
  2884. if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  2885. strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
  2886. send_ssi_file(conn, path, fp, include_level + 1);
  2887. } else {
  2888. send_file_data(conn, fp, INT64_MAX);
  2889. }
  2890. (void) fclose(fp);
  2891. }
  2892. }
  2893. #if !defined(NO_POPEN)
  2894. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  2895. char cmd[MG_BUF_LEN];
  2896. FILE *fp;
  2897. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  2898. cry(conn, "Bad SSI #exec: [%s]", tag);
  2899. } else if ((fp = popen(cmd, "r")) == NULL) {
  2900. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  2901. } else {
  2902. send_file_data(conn, fp, INT64_MAX);
  2903. (void) pclose(fp);
  2904. }
  2905. }
  2906. #endif // !NO_POPEN
  2907. static void send_ssi_file(struct mg_connection *conn, const char *path,
  2908. FILE *fp, int include_level) {
  2909. char buf[MG_BUF_LEN];
  2910. int ch, len, in_ssi_tag;
  2911. if (include_level > 10) {
  2912. cry(conn, "SSI #include level is too deep (%s)", path);
  2913. return;
  2914. }
  2915. in_ssi_tag = 0;
  2916. len = 0;
  2917. while ((ch = fgetc(fp)) != EOF) {
  2918. if (in_ssi_tag && ch == '>') {
  2919. in_ssi_tag = 0;
  2920. buf[len++] = (char) ch;
  2921. buf[len] = '\0';
  2922. assert(len <= (int) sizeof(buf));
  2923. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  2924. // Not an SSI tag, pass it
  2925. (void) mg_write(conn, buf, (size_t)len);
  2926. } else {
  2927. if (!memcmp(buf + 5, "include", 7)) {
  2928. do_ssi_include(conn, path, buf + 12, include_level);
  2929. #if !defined(NO_POPEN)
  2930. } else if (!memcmp(buf + 5, "exec", 4)) {
  2931. do_ssi_exec(conn, buf + 9);
  2932. #endif // !NO_POPEN
  2933. } else {
  2934. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  2935. }
  2936. }
  2937. len = 0;
  2938. } else if (in_ssi_tag) {
  2939. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  2940. // Not an SSI tag
  2941. in_ssi_tag = 0;
  2942. } else if (len == (int) sizeof(buf) - 2) {
  2943. cry(conn, "%s: SSI tag is too large", path);
  2944. len = 0;
  2945. }
  2946. buf[len++] = ch & 0xff;
  2947. } else if (ch == '<') {
  2948. in_ssi_tag = 1;
  2949. if (len > 0) {
  2950. (void) mg_write(conn, buf, (size_t)len);
  2951. }
  2952. len = 0;
  2953. buf[len++] = ch & 0xff;
  2954. } else {
  2955. buf[len++] = ch & 0xff;
  2956. if (len == (int) sizeof(buf)) {
  2957. (void) mg_write(conn, buf, (size_t)len);
  2958. len = 0;
  2959. }
  2960. }
  2961. }
  2962. // Send the rest of buffered data
  2963. if (len > 0) {
  2964. (void) mg_write(conn, buf, (size_t)len);
  2965. }
  2966. }
  2967. static void handle_ssi_file_request(struct mg_connection *conn,
  2968. const char *path) {
  2969. FILE *fp;
  2970. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2971. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  2972. strerror(ERRNO));
  2973. } else {
  2974. conn->must_close = 1;
  2975. set_close_on_exec(fileno(fp));
  2976. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  2977. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  2978. suggest_connection_header(conn));
  2979. send_ssi_file(conn, path, fp, 0);
  2980. (void) fclose(fp);
  2981. }
  2982. }
  2983. static void send_options(struct mg_connection *conn) {
  2984. conn->status_code = 200;
  2985. (void) mg_printf(conn,
  2986. "HTTP/1.1 200 OK\r\n"
  2987. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
  2988. "DAV: 1\r\n\r\n");
  2989. }
  2990. // Writes PROPFIND properties for a collection element
  2991. static void print_props(struct mg_connection *conn, const char* uri,
  2992. struct mgstat* st) {
  2993. char mtime[64];
  2994. gmt_time_string(mtime, sizeof(mtime), &st->mtime);
  2995. conn->num_bytes_sent += mg_printf(conn,
  2996. "<d:response>"
  2997. "<d:href>%s</d:href>"
  2998. "<d:propstat>"
  2999. "<d:prop>"
  3000. "<d:resourcetype>%s</d:resourcetype>"
  3001. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  3002. "<d:getlastmodified>%s</d:getlastmodified>"
  3003. "</d:prop>"
  3004. "<d:status>HTTP/1.1 200 OK</d:status>"
  3005. "</d:propstat>"
  3006. "</d:response>\n",
  3007. uri,
  3008. st->is_directory ? "<d:collection/>" : "",
  3009. st->size,
  3010. mtime);
  3011. }
  3012. static void print_dav_dir_entry(struct de *de, void *data) {
  3013. char href[PATH_MAX];
  3014. struct mg_connection *conn = (struct mg_connection *) data;
  3015. mg_snprintf(conn, href, sizeof(href), "%s%s",
  3016. conn->request_info.uri, de->file_name);
  3017. print_props(conn, href, &de->st);
  3018. }
  3019. static void handle_propfind(struct mg_connection *conn, const char* path,
  3020. struct mgstat* st) {
  3021. const char *depth = mg_get_header(conn, "Depth");
  3022. conn->must_close = 1;
  3023. conn->status_code = 207;
  3024. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  3025. "Connection: close\r\n"
  3026. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  3027. conn->num_bytes_sent += mg_printf(conn,
  3028. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  3029. "<d:multistatus xmlns:d='DAV:'>\n");
  3030. // Print properties for the requested resource itself
  3031. print_props(conn, conn->request_info.uri, st);
  3032. // If it is a directory, print directory entries too if Depth is not 0
  3033. if (st->is_directory &&
  3034. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  3035. (depth == NULL || strcmp(depth, "0") != 0)) {
  3036. scan_directory(conn, path, conn, &print_dav_dir_entry);
  3037. }
  3038. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  3039. }
  3040. #if defined(USE_WEBSOCKET)
  3041. // START OF SHA-1 code
  3042. // Copyright(c) By Steve Reid <steve@edmweb.com>
  3043. #define SHA1HANDSOFF
  3044. #if defined(__sun)
  3045. #include "solarisfixes.h"
  3046. #endif
  3047. #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  3048. #if BYTE_ORDER == LITTLE_ENDIAN
  3049. #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  3050. |(rol(block->l[i],8)&0x00FF00FF))
  3051. #elif BYTE_ORDER == BIG_ENDIAN
  3052. #define blk0(i) block->l[i]
  3053. #else
  3054. #error "Endianness not defined!"
  3055. #endif
  3056. #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  3057. ^block->l[(i+2)&15]^block->l[i&15],1))
  3058. #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3059. #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  3060. #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  3061. #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  3062. #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  3063. typedef struct {
  3064. uint32_t state[5];
  3065. uint32_t count[2];
  3066. unsigned char buffer[64];
  3067. } SHA1_CTX;
  3068. static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
  3069. uint32_t a, b, c, d, e;
  3070. typedef union { unsigned char c[64]; uint32_t l[16]; } CHAR64LONG16;
  3071. CHAR64LONG16 block[1];
  3072. memcpy(block, buffer, 64);
  3073. a = state[0];
  3074. b = state[1];
  3075. c = state[2];
  3076. d = state[3];
  3077. e = state[4];
  3078. 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);
  3079. 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);
  3080. 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);
  3081. 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);
  3082. 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);
  3083. 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);
  3084. 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);
  3085. 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);
  3086. 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);
  3087. 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);
  3088. 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);
  3089. 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);
  3090. 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);
  3091. 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);
  3092. 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);
  3093. 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);
  3094. 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);
  3095. 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);
  3096. 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);
  3097. 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);
  3098. state[0] += a;
  3099. state[1] += b;
  3100. state[2] += c;
  3101. state[3] += d;
  3102. state[4] += e;
  3103. a = b = c = d = e = 0;
  3104. memset(block, '\0', sizeof(block));
  3105. }
  3106. static void SHA1Init(SHA1_CTX* context) {
  3107. context->state[0] = 0x67452301;
  3108. context->state[1] = 0xEFCDAB89;
  3109. context->state[2] = 0x98BADCFE;
  3110. context->state[3] = 0x10325476;
  3111. context->state[4] = 0xC3D2E1F0;
  3112. context->count[0] = context->count[1] = 0;
  3113. }
  3114. static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
  3115. uint32_t len) {
  3116. uint32_t i, j;
  3117. j = context->count[0];
  3118. if ((context->count[0] += len << 3) < j)
  3119. context->count[1]++;
  3120. context->count[1] += (len>>29);
  3121. j = (j >> 3) & 63;
  3122. if ((j + len) > 63) {
  3123. memcpy(&context->buffer[j], data, (i = 64-j));
  3124. SHA1Transform(context->state, context->buffer);
  3125. for ( ; i + 63 < len; i += 64) {
  3126. SHA1Transform(context->state, &data[i]);
  3127. }
  3128. j = 0;
  3129. }
  3130. else i = 0;
  3131. memcpy(&context->buffer[j], &data[i], len - i);
  3132. }
  3133. static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
  3134. unsigned i;
  3135. unsigned char finalcount[8], c;
  3136. for (i = 0; i < 8; i++) {
  3137. finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
  3138. >> ((3-(i & 3)) * 8) ) & 255);
  3139. }
  3140. c = 0200;
  3141. SHA1Update(context, &c, 1);
  3142. while ((context->count[0] & 504) != 448) {
  3143. c = 0000;
  3144. SHA1Update(context, &c, 1);
  3145. }
  3146. SHA1Update(context, finalcount, 8);
  3147. for (i = 0; i < 20; i++) {
  3148. digest[i] = (unsigned char)
  3149. ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
  3150. }
  3151. memset(context, '\0', sizeof(*context));
  3152. memset(&finalcount, '\0', sizeof(finalcount));
  3153. }
  3154. // END OF SHA1 CODE
  3155. static void base64_encode(const unsigned char *src, int src_len, char *dst) {
  3156. static const char *b64 =
  3157. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  3158. int i, j, a, b, c;
  3159. for (i = j = 0; i < src_len; i += 3) {
  3160. a = src[i];
  3161. b = i + 1 >= src_len ? 0 : src[i + 1];
  3162. c = i + 2 >= src_len ? 0 : src[i + 2];
  3163. dst[j++] = b64[a >> 2];
  3164. dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
  3165. if (i + 1 < src_len) {
  3166. dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
  3167. }
  3168. if (i + 2 < src_len) {
  3169. dst[j++] = b64[c & 63];
  3170. }
  3171. }
  3172. while (j % 4 != 0) {
  3173. dst[j++] = '=';
  3174. }
  3175. dst[j++] = '\0';
  3176. }
  3177. static void send_websocket_handshake(struct mg_connection *conn) {
  3178. static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  3179. char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
  3180. SHA1_CTX sha_ctx;
  3181. mg_snprintf(conn, buf, sizeof(buf), "%s%s",
  3182. mg_get_header(conn, "Sec-WebSocket-Key"), magic);
  3183. SHA1Init(&sha_ctx);
  3184. SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
  3185. SHA1Final((unsigned char *) sha, &sha_ctx);
  3186. base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
  3187. mg_printf(conn, "%s%s%s",
  3188. "HTTP/1.1 101 Switching Protocols\r\n"
  3189. "Upgrade: websocket\r\n"
  3190. "Connection: Upgrade\r\n"
  3191. "Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
  3192. }
  3193. static void read_websocket(struct mg_connection *conn) {
  3194. unsigned char *mask, *buf = (unsigned char *) conn->buf + conn->request_len;
  3195. int n, len, mask_len, body_len, discard_len;
  3196. for (;;) {
  3197. if ((body_len = conn->data_len - conn->request_len) >= 2) {
  3198. len = buf[1] & 127;
  3199. mask_len = buf[1] & 128 ? 4 : 0;
  3200. if (len < 126) {
  3201. conn->content_len = 2 + mask_len + len;
  3202. mask = buf + 2;
  3203. } else if (len == 126 && body_len >= 4) {
  3204. conn->content_len = 2 + mask_len + ((((int) buf[2]) << 8) + buf[3]);
  3205. mask = buf + 4;
  3206. } else if (body_len >= 10) {
  3207. conn->content_len = 2 + mask_len +
  3208. ((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32 |
  3209. htonl(* (uint32_t *) &buf[6]);
  3210. mask = buf + 10;
  3211. }
  3212. }
  3213. if (conn->content_len > 0) {
  3214. if (call_user(conn, MG_WEBSOCKET_MESSAGE) != NULL) {
  3215. break; // Callback signalled to exit
  3216. }
  3217. discard_len = conn->content_len > body_len ? body_len : conn->content_len;
  3218. memmove(buf, buf + discard_len, conn->data_len - discard_len);
  3219. conn->data_len -= discard_len;
  3220. conn->content_len = conn->consumed_content = 0;
  3221. } else {
  3222. if (wait_until_socket_is_readable(conn) == 0) {
  3223. break;
  3224. }
  3225. n = pull(NULL, conn, conn->buf + conn->data_len,
  3226. conn->buf_size - conn->data_len);
  3227. if (n <= 0) {
  3228. break;
  3229. }
  3230. conn->data_len += n;
  3231. }
  3232. }
  3233. }
  3234. static void handle_websocket_request(struct mg_connection *conn) {
  3235. if (strcmp(mg_get_header(conn, "Sec-WebSocket-Version"), "13") != 0) {
  3236. send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
  3237. } else if (call_user(conn, MG_WEBSOCKET_CONNECT) != NULL) {
  3238. // Callback has returned non-NULL, do not proceed with handshake
  3239. } else {
  3240. send_websocket_handshake(conn);
  3241. call_user(conn, MG_WEBSOCKET_READY);
  3242. read_websocket(conn);
  3243. call_user(conn, MG_WEBSOCKET_CLOSE);
  3244. }
  3245. }
  3246. static int is_websocket_request(const struct mg_connection *conn) {
  3247. const char *host, *upgrade, *connection, *version, *key;
  3248. host = mg_get_header(conn, "Host");
  3249. upgrade = mg_get_header(conn, "Upgrade");
  3250. connection = mg_get_header(conn, "Connection");
  3251. key = mg_get_header(conn, "Sec-WebSocket-Key");
  3252. version = mg_get_header(conn, "Sec-WebSocket-Version");
  3253. return host != NULL && upgrade != NULL && connection != NULL &&
  3254. key != NULL && version != NULL &&
  3255. !mg_strcasecmp(upgrade, "websocket") &&
  3256. !mg_strcasecmp(connection, "Upgrade");
  3257. }
  3258. #endif // !USE_WEBSOCKET
  3259. static int isbyte(int n) {
  3260. return n >= 0 && n <= 255;
  3261. }
  3262. static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
  3263. int n, a, b, c, d, slash = 32, len = 0;
  3264. if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
  3265. sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
  3266. isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
  3267. slash >= 0 && slash < 33) {
  3268. len = n;
  3269. *net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
  3270. *mask = slash ? 0xffffffffU << (32 - slash) : 0;
  3271. }
  3272. return len;
  3273. }
  3274. static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
  3275. int throttle = 0;
  3276. struct vec vec, val;
  3277. uint32_t net, mask;
  3278. char mult;
  3279. double v;
  3280. while ((spec = next_option(spec, &vec, &val)) != NULL) {
  3281. mult = ',';
  3282. if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
  3283. (lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
  3284. continue;
  3285. }
  3286. v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
  3287. if (vec.len == 1 && vec.ptr[0] == '*') {
  3288. throttle = (int) v;
  3289. } else if (parse_net(vec.ptr, &net, &mask) > 0) {
  3290. if ((remote_ip & mask) == net) {
  3291. throttle = (int) v;
  3292. }
  3293. } else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
  3294. throttle = (int) v;
  3295. }
  3296. }
  3297. return throttle;
  3298. }
  3299. static uint32_t get_remote_ip(const struct mg_connection *conn) {
  3300. return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
  3301. }
  3302. // This is the heart of the Mongoose's logic.
  3303. // This function is called when the request is read, parsed and validated,
  3304. // and Mongoose must decide what action to take: serve a file, or
  3305. // a directory, or call embedded function, etcetera.
  3306. static void handle_request(struct mg_connection *conn) {
  3307. struct mg_request_info *ri = &conn->request_info;
  3308. char path[PATH_MAX];
  3309. int stat_result, uri_len;
  3310. struct mgstat st;
  3311. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  3312. *conn->request_info.query_string++ = '\0';
  3313. }
  3314. uri_len = (int) strlen(ri->uri);
  3315. url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0);
  3316. remove_double_dots_and_double_slashes(ri->uri);
  3317. stat_result = convert_uri_to_file_name(conn, path, sizeof(path), &st);
  3318. conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
  3319. get_remote_ip(conn), ri->uri);
  3320. DEBUG_TRACE(("%s", ri->uri));
  3321. if (!check_authorization(conn, path)) {
  3322. send_authorization_request(conn);
  3323. #if defined(USE_WEBSOCKET)
  3324. } else if (is_websocket_request(conn)) {
  3325. handle_websocket_request(conn);
  3326. #endif
  3327. } else if (call_user(conn, MG_NEW_REQUEST) != NULL) {
  3328. // Do nothing, callback has served the request
  3329. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  3330. send_options(conn);
  3331. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  3332. send_http_error(conn, 404, "Not Found", "Not Found");
  3333. } else if ((!strcmp(ri->request_method, "PUT") ||
  3334. !strcmp(ri->request_method, "DELETE")) &&
  3335. (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
  3336. is_authorized_for_put(conn) != 1)) {
  3337. send_authorization_request(conn);
  3338. } else if (!strcmp(ri->request_method, "PUT")) {
  3339. put_file(conn, path);
  3340. } else if (!strcmp(ri->request_method, "DELETE")) {
  3341. if (mg_remove(path) == 0) {
  3342. send_http_error(conn, 200, "OK", "%s", "");
  3343. } else {
  3344. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  3345. strerror(ERRNO));
  3346. }
  3347. } else if (stat_result != 0 || must_hide_file(conn, path)) {
  3348. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  3349. } else if (st.is_directory && ri->uri[uri_len - 1] != '/') {
  3350. (void) mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
  3351. "Location: %s/\r\n\r\n", ri->uri);
  3352. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  3353. handle_propfind(conn, path, &st);
  3354. } else if (st.is_directory &&
  3355. !substitute_index_file(conn, path, sizeof(path), &st)) {
  3356. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  3357. handle_directory_request(conn, path);
  3358. } else {
  3359. send_http_error(conn, 403, "Directory Listing Denied",
  3360. "Directory listing denied");
  3361. }
  3362. #if !defined(NO_CGI)
  3363. } else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
  3364. strlen(conn->ctx->config[CGI_EXTENSIONS]),
  3365. path) > 0) {
  3366. if (strcmp(ri->request_method, "POST") &&
  3367. strcmp(ri->request_method, "GET")) {
  3368. send_http_error(conn, 501, "Not Implemented",
  3369. "Method %s is not implemented", ri->request_method);
  3370. } else {
  3371. handle_cgi_request(conn, path);
  3372. }
  3373. #endif // !NO_CGI
  3374. } else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
  3375. strlen(conn->ctx->config[SSI_EXTENSIONS]),
  3376. path) > 0) {
  3377. handle_ssi_file_request(conn, path);
  3378. } else if (is_not_modified(conn, &st)) {
  3379. send_http_error(conn, 304, "Not Modified", "%s", "");
  3380. } else {
  3381. handle_file_request(conn, path, &st);
  3382. }
  3383. }
  3384. static void close_all_listening_sockets(struct mg_context *ctx) {
  3385. struct socket *sp, *tmp;
  3386. for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
  3387. tmp = sp->next;
  3388. (void) closesocket(sp->sock);
  3389. free(sp);
  3390. }
  3391. }
  3392. // Valid listening port specification is: [ip_address:]port[s]
  3393. // Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
  3394. // TODO(lsm): add parsing of the IPv6 address
  3395. static int parse_port_string(const struct vec *vec, struct socket *so) {
  3396. int a, b, c, d, port, len;
  3397. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  3398. // Also, all-zeroes in the socket address means binding to all addresses
  3399. // for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
  3400. memset(so, 0, sizeof(*so));
  3401. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  3402. // Bind to a specific IPv4 address
  3403. so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  3404. } else if (sscanf(vec->ptr, "%d%n", &port, &len) != 1 ||
  3405. len <= 0 ||
  3406. len > (int) vec->len ||
  3407. (vec->ptr[len] && vec->ptr[len] != 's' && vec->ptr[len] != ',')) {
  3408. return 0;
  3409. }
  3410. so->is_ssl = vec->ptr[len] == 's';
  3411. #if defined(USE_IPV6)
  3412. so->lsa.sin6.sin6_family = AF_INET6;
  3413. so->lsa.sin6.sin6_port = htons((uint16_t) port);
  3414. #else
  3415. so->lsa.sin.sin_family = AF_INET;
  3416. so->lsa.sin.sin_port = htons((uint16_t) port);
  3417. #endif
  3418. return 1;
  3419. }
  3420. static int set_ports_option(struct mg_context *ctx) {
  3421. const char *list = ctx->config[LISTENING_PORTS];
  3422. int on = 1, success = 1;
  3423. SOCKET sock;
  3424. struct vec vec;
  3425. struct socket so, *listener;
  3426. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  3427. if (!parse_port_string(&vec, &so)) {
  3428. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  3429. __func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  3430. success = 0;
  3431. } else if (so.is_ssl &&
  3432. (ctx->ssl_ctx == NULL || ctx->config[SSL_CERTIFICATE] == NULL)) {
  3433. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  3434. success = 0;
  3435. } else if ((sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
  3436. INVALID_SOCKET ||
  3437. // On Windows, SO_REUSEADDR is recommended only for
  3438. // broadcast UDP sockets
  3439. setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char *) &on,
  3440. sizeof(on)) != 0 ||
  3441. // Set TCP keep-alive. This is needed because if HTTP-level
  3442. // keep-alive is enabled, and client resets the connection,
  3443. // server won't get TCP FIN or RST and will keep the connection
  3444. // open forever. With TCP keep-alive, next keep-alive
  3445. // handshake will figure out that the client is down and
  3446. // will close the server end.
  3447. // Thanks to Igor Klopov who suggested the patch.
  3448. setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *) &on,
  3449. sizeof(on)) != 0 ||
  3450. bind(sock, &so.lsa.sa, sizeof(so.lsa)) != 0 ||
  3451. listen(sock, SOMAXCONN) != 0) {
  3452. closesocket(sock);
  3453. cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
  3454. (int) vec.len, vec.ptr, strerror(ERRNO));
  3455. success = 0;
  3456. } else if ((listener = (struct socket *)
  3457. calloc(1, sizeof(*listener))) == NULL) {
  3458. // NOTE(lsm): order is important: call cry before closesocket(),
  3459. // cause closesocket() alters the errno.
  3460. cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO));
  3461. closesocket(sock);
  3462. success = 0;
  3463. } else {
  3464. *listener = so;
  3465. listener->sock = sock;
  3466. set_close_on_exec(listener->sock);
  3467. listener->next = ctx->listening_sockets;
  3468. ctx->listening_sockets = listener;
  3469. }
  3470. }
  3471. if (!success) {
  3472. close_all_listening_sockets(ctx);
  3473. }
  3474. return success;
  3475. }
  3476. static void log_header(const struct mg_connection *conn, const char *header,
  3477. FILE *fp) {
  3478. const char *header_value;
  3479. if ((header_value = mg_get_header(conn, header)) == NULL) {
  3480. (void) fprintf(fp, "%s", " -");
  3481. } else {
  3482. (void) fprintf(fp, " \"%s\"", header_value);
  3483. }
  3484. }
  3485. static void log_access(const struct mg_connection *conn) {
  3486. const struct mg_request_info *ri;
  3487. FILE *fp;
  3488. char date[64], src_addr[20];
  3489. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  3490. mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  3491. if (fp == NULL)
  3492. return;
  3493. strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3494. localtime(&conn->birth_time));
  3495. ri = &conn->request_info;
  3496. flockfile(fp);
  3497. sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
  3498. fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3499. src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
  3500. ri->request_method ? ri->request_method : "-",
  3501. ri->uri ? ri->uri : "-", ri->http_version,
  3502. conn->status_code, conn->num_bytes_sent);
  3503. log_header(conn, "Referer", fp);
  3504. log_header(conn, "User-Agent", fp);
  3505. fputc('\n', fp);
  3506. fflush(fp);
  3507. funlockfile(fp);
  3508. fclose(fp);
  3509. }
  3510. // Verify given socket address against the ACL.
  3511. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  3512. static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
  3513. int allowed, flag;
  3514. uint32_t net, mask;
  3515. struct vec vec;
  3516. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  3517. // If any ACL is set, deny by default
  3518. allowed = list == NULL ? '+' : '-';
  3519. while ((list = next_option(list, &vec, NULL)) != NULL) {
  3520. flag = vec.ptr[0];
  3521. if ((flag != '+' && flag != '-') ||
  3522. parse_net(&vec.ptr[1], &net, &mask) == 0) {
  3523. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  3524. return -1;
  3525. }
  3526. if (net == (remote_ip & mask)) {
  3527. allowed = flag;
  3528. }
  3529. }
  3530. return allowed == '+';
  3531. }
  3532. static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) {
  3533. FD_SET(fd, set);
  3534. if (fd > (SOCKET) *max_fd) {
  3535. *max_fd = (int) fd;
  3536. }
  3537. }
  3538. #if !defined(_WIN32)
  3539. static int set_uid_option(struct mg_context *ctx) {
  3540. struct passwd *pw;
  3541. const char *uid = ctx->config[RUN_AS_USER];
  3542. int success = 0;
  3543. if (uid == NULL) {
  3544. success = 1;
  3545. } else {
  3546. if ((pw = getpwnam(uid)) == NULL) {
  3547. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  3548. } else if (setgid(pw->pw_gid) == -1) {
  3549. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  3550. } else if (setuid(pw->pw_uid) == -1) {
  3551. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  3552. } else {
  3553. success = 1;
  3554. }
  3555. }
  3556. return success;
  3557. }
  3558. #endif // !_WIN32
  3559. #if !defined(NO_SSL)
  3560. static pthread_mutex_t *ssl_mutexes;
  3561. // Return OpenSSL error message
  3562. static const char *ssl_error(void) {
  3563. unsigned long err;
  3564. err = ERR_get_error();
  3565. return err == 0 ? "" : ERR_error_string(err, NULL);
  3566. }
  3567. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  3568. int line) {
  3569. line = 0; // Unused
  3570. file = NULL; // Unused
  3571. if (mode & CRYPTO_LOCK) {
  3572. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  3573. } else {
  3574. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  3575. }
  3576. }
  3577. static unsigned long ssl_id_callback(void) {
  3578. return (unsigned long) pthread_self();
  3579. }
  3580. #if !defined(NO_SSL_DL)
  3581. static int load_dll(struct mg_context *ctx, const char *dll_name,
  3582. struct ssl_func *sw) {
  3583. union {void *p; void (*fp)(void);} u;
  3584. void *dll_handle;
  3585. struct ssl_func *fp;
  3586. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  3587. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  3588. return 0;
  3589. }
  3590. for (fp = sw; fp->name != NULL; fp++) {
  3591. #ifdef _WIN32
  3592. // GetProcAddress() returns pointer to function
  3593. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  3594. #else
  3595. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  3596. // function pointers. We need to use a union to make a cast.
  3597. u.p = dlsym(dll_handle, fp->name);
  3598. #endif // _WIN32
  3599. if (u.fp == NULL) {
  3600. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  3601. return 0;
  3602. } else {
  3603. fp->ptr = u.fp;
  3604. }
  3605. }
  3606. return 1;
  3607. }
  3608. #endif // NO_SSL_DL
  3609. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  3610. static int set_ssl_option(struct mg_context *ctx) {
  3611. int i, size;
  3612. const char *pem;
  3613. // If PEM file is not specified, skip SSL initialization.
  3614. if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL) {
  3615. return 1;
  3616. }
  3617. #if !defined(NO_SSL_DL)
  3618. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  3619. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  3620. return 0;
  3621. }
  3622. #endif // NO_SSL_DL
  3623. // Initialize SSL crap
  3624. SSL_library_init();
  3625. SSL_load_error_strings();
  3626. if ((ctx->client_ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) {
  3627. cry(fc(ctx), "SSL_CTX_new (client) error: %s", ssl_error());
  3628. }
  3629. if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  3630. cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
  3631. return 0;
  3632. }
  3633. // If user callback returned non-NULL, that means that user callback has
  3634. // set up certificate itself. In this case, skip sertificate setting.
  3635. if (call_user(fc(ctx), MG_INIT_SSL) == NULL &&
  3636. (SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0 ||
  3637. SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, SSL_FILETYPE_PEM) == 0)) {
  3638. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  3639. return 0;
  3640. }
  3641. if (pem != NULL) {
  3642. (void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
  3643. }
  3644. // Initialize locking callbacks, needed for thread safety.
  3645. // http://www.openssl.org/support/faq.html#PROG1
  3646. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  3647. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  3648. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  3649. return 0;
  3650. }
  3651. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3652. pthread_mutex_init(&ssl_mutexes[i], NULL);
  3653. }
  3654. CRYPTO_set_locking_callback(&ssl_locking_callback);
  3655. CRYPTO_set_id_callback(&ssl_id_callback);
  3656. return 1;
  3657. }
  3658. static void uninitialize_ssl(struct mg_context *ctx) {
  3659. int i;
  3660. if (ctx->ssl_ctx != NULL) {
  3661. CRYPTO_set_locking_callback(NULL);
  3662. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3663. pthread_mutex_destroy(&ssl_mutexes[i]);
  3664. }
  3665. CRYPTO_set_locking_callback(NULL);
  3666. CRYPTO_set_id_callback(NULL);
  3667. }
  3668. }
  3669. #endif // !NO_SSL
  3670. static int set_gpass_option(struct mg_context *ctx) {
  3671. struct mgstat mgstat;
  3672. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  3673. return path == NULL || mg_stat(path, &mgstat) == 0;
  3674. }
  3675. static int set_acl_option(struct mg_context *ctx) {
  3676. return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
  3677. }
  3678. static void reset_per_request_attributes(struct mg_connection *conn) {
  3679. conn->path_info = conn->log_message = NULL;
  3680. conn->num_bytes_sent = conn->consumed_content = 0;
  3681. conn->status_code = -1;
  3682. conn->must_close = conn->request_len = conn->throttle = 0;
  3683. }
  3684. static void close_socket_gracefully(struct mg_connection *conn) {
  3685. char buf[MG_BUF_LEN];
  3686. struct linger linger;
  3687. int n, sock = conn->client.sock;
  3688. // Set linger option to avoid socket hanging out after close. This prevent
  3689. // ephemeral port exhaust problem under high QPS.
  3690. linger.l_onoff = 1;
  3691. linger.l_linger = 1;
  3692. setsockopt(sock, SOL_SOCKET, SO_LINGER, (char *) &linger, sizeof(linger));
  3693. // Send FIN to the client
  3694. (void) shutdown(sock, SHUT_WR);
  3695. set_non_blocking_mode(sock);
  3696. // Read and discard pending incoming data. If we do not do that and close the
  3697. // socket, the data in the send buffer may be discarded. This
  3698. // behaviour is seen on Windows, when client keeps sending data
  3699. // when server decides to close the connection; then when client
  3700. // does recv() it gets no data back.
  3701. do {
  3702. n = pull(NULL, conn, buf, sizeof(buf));
  3703. } while (n > 0);
  3704. // Now we know that our FIN is ACK-ed, safe to close
  3705. (void) closesocket(sock);
  3706. }
  3707. static void close_connection(struct mg_connection *conn) {
  3708. if (conn->ssl) {
  3709. SSL_free(conn->ssl);
  3710. conn->ssl = NULL;
  3711. }
  3712. if (conn->client.sock != INVALID_SOCKET) {
  3713. close_socket_gracefully(conn);
  3714. }
  3715. }
  3716. void mg_close_connection(struct mg_connection *conn) {
  3717. close_connection(conn);
  3718. free(conn);
  3719. }
  3720. struct mg_connection *mg_connect(struct mg_context *ctx,
  3721. const char *host, int port, int use_ssl) {
  3722. struct mg_connection *newconn = NULL;
  3723. struct sockaddr_in sin;
  3724. struct hostent *he;
  3725. int sock;
  3726. if (use_ssl && (ctx == NULL || ctx->client_ssl_ctx == NULL)) {
  3727. cry(fc(ctx), "%s: SSL is not initialized", __func__);
  3728. } else if ((he = gethostbyname(host)) == NULL) {
  3729. cry(fc(ctx), "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
  3730. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  3731. cry(fc(ctx), "%s: socket: %s", __func__, strerror(ERRNO));
  3732. } else {
  3733. sin.sin_family = AF_INET;
  3734. sin.sin_port = htons((uint16_t) port);
  3735. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  3736. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  3737. cry(fc(ctx), "%s: connect(%s:%d): %s", __func__, host, port,
  3738. strerror(ERRNO));
  3739. closesocket(sock);
  3740. } else if ((newconn = (struct mg_connection *)
  3741. calloc(1, sizeof(*newconn))) == NULL) {
  3742. cry(fc(ctx), "%s: calloc: %s", __func__, strerror(ERRNO));
  3743. closesocket(sock);
  3744. } else {
  3745. newconn->ctx = ctx;
  3746. newconn->client.sock = sock;
  3747. newconn->client.rsa.sin = sin;
  3748. newconn->client.is_ssl = use_ssl;
  3749. if (use_ssl) {
  3750. sslize(newconn, ctx->client_ssl_ctx, SSL_connect);
  3751. }
  3752. }
  3753. }
  3754. return newconn;
  3755. }
  3756. FILE *mg_fetch(struct mg_context *ctx, const char *url, const char *path,
  3757. char *buf, size_t buf_len, struct mg_request_info *ri) {
  3758. struct mg_connection *newconn;
  3759. int n, req_length, data_length, port;
  3760. char host[1025], proto[10], buf2[MG_BUF_LEN];
  3761. FILE *fp = NULL;
  3762. if (sscanf(url, "%9[htps]://%1024[^:]:%d/%n", proto, host, &port, &n) == 3) {
  3763. } else if (sscanf(url, "%9[htps]://%1024[^/]/%n", proto, host, &n) == 2) {
  3764. port = mg_strcasecmp(proto, "https") == 0 ? 443 : 80;
  3765. } else {
  3766. cry(fc(ctx), "%s: invalid URL: [%s]", __func__, url);
  3767. return NULL;
  3768. }
  3769. if ((newconn = mg_connect(ctx, host, port,
  3770. !strcmp(proto, "https"))) == NULL) {
  3771. cry(fc(ctx), "%s: mg_connect(%s): %s", __func__, url, strerror(ERRNO));
  3772. } else {
  3773. mg_printf(newconn, "GET /%s HTTP/1.0\r\nHost: %s\r\n\r\n", url + n, host);
  3774. data_length = 0;
  3775. req_length = read_request(NULL, newconn, buf, buf_len, &data_length);
  3776. if (req_length <= 0) {
  3777. cry(fc(ctx), "%s(%s): invalid HTTP reply", __func__, url);
  3778. } else if (parse_http_response(buf, req_length, ri) <= 0) {
  3779. cry(fc(ctx), "%s(%s): cannot parse HTTP headers", __func__, url);
  3780. } else if ((fp = fopen(path, "w+b")) == NULL) {
  3781. cry(fc(ctx), "%s: fopen(%s): %s", __func__, path, strerror(ERRNO));
  3782. } else {
  3783. // Write chunk of data that may be in the user's buffer
  3784. data_length -= req_length;
  3785. if (data_length > 0 &&
  3786. fwrite(buf + req_length, 1, data_length, fp) != (size_t) data_length) {
  3787. cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO));
  3788. fclose(fp);
  3789. fp = NULL;
  3790. }
  3791. // Read the rest of the response and write it to the file. Do not use
  3792. // mg_read() cause we didn't set newconn->content_len properly.
  3793. while (fp && (data_length = pull(0, newconn, buf2, sizeof(buf2))) > 0) {
  3794. if (fwrite(buf2, 1, data_length, fp) != (size_t) data_length) {
  3795. cry(fc(ctx), "%s: fwrite(%s): %s", __func__, path, strerror(ERRNO));
  3796. fclose(fp);
  3797. fp = NULL;
  3798. break;
  3799. }
  3800. }
  3801. }
  3802. mg_close_connection(newconn);
  3803. }
  3804. return fp;
  3805. }
  3806. static int is_valid_uri(const char *uri) {
  3807. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  3808. // URI can be an asterisk (*) or should start with slash.
  3809. return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
  3810. }
  3811. static void process_new_connection(struct mg_connection *conn) {
  3812. struct mg_request_info *ri = &conn->request_info;
  3813. int keep_alive_enabled, discard_len;
  3814. const char *cl;
  3815. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  3816. do {
  3817. reset_per_request_attributes(conn);
  3818. conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
  3819. &conn->data_len);
  3820. assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
  3821. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  3822. send_http_error(conn, 413, "Request Too Large", "%s", "");
  3823. return;
  3824. } if (conn->request_len <= 0) {
  3825. return; // Remote end closed the connection
  3826. }
  3827. if (parse_http_request(conn->buf, conn->buf_size, ri) <= 0 ||
  3828. !is_valid_uri(ri->uri)) {
  3829. // Do not put garbage in the access log, just send it back to the client
  3830. send_http_error(conn, 400, "Bad Request",
  3831. "Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf);
  3832. conn->must_close = 1;
  3833. } else if (strcmp(ri->http_version, "1.0") &&
  3834. strcmp(ri->http_version, "1.1")) {
  3835. // Request seems valid, but HTTP version is strange
  3836. send_http_error(conn, 505, "HTTP version not supported", "%s", "");
  3837. log_access(conn);
  3838. } else {
  3839. // Request is valid, handle it
  3840. if ((cl = get_header(ri, "Content-Length")) != NULL) {
  3841. conn->content_len = strtoll(cl, NULL, 10);
  3842. } else if (!mg_strcasecmp(ri->request_method, "POST") ||
  3843. !mg_strcasecmp(ri->request_method, "PUT")) {
  3844. conn->content_len = -1;
  3845. } else {
  3846. conn->content_len = 0;
  3847. }
  3848. conn->birth_time = time(NULL);
  3849. handle_request(conn);
  3850. call_user(conn, MG_REQUEST_COMPLETE);
  3851. log_access(conn);
  3852. }
  3853. if (ri->remote_user != NULL) {
  3854. free((void *) ri->remote_user);
  3855. }
  3856. // Discard all buffered data for this request
  3857. discard_len = conn->content_len >= 0 &&
  3858. conn->request_len + conn->content_len < (int64_t) conn->data_len ?
  3859. (int) (conn->request_len + conn->content_len) : conn->data_len;
  3860. memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
  3861. conn->data_len -= discard_len;
  3862. assert(conn->data_len >= 0);
  3863. assert(conn->data_len <= conn->buf_size);
  3864. } while (conn->ctx->stop_flag == 0 &&
  3865. keep_alive_enabled &&
  3866. conn->content_len >= 0 &&
  3867. should_keep_alive(conn));
  3868. }
  3869. // Worker threads take accepted socket from the queue
  3870. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  3871. (void) pthread_mutex_lock(&ctx->mutex);
  3872. DEBUG_TRACE(("going idle"));
  3873. // If the queue is empty, wait. We're idle at this point.
  3874. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  3875. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  3876. }
  3877. // If we're stopping, sq_head may be equal to sq_tail.
  3878. if (ctx->sq_head > ctx->sq_tail) {
  3879. // Copy socket from the queue and increment tail
  3880. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  3881. ctx->sq_tail++;
  3882. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  3883. // Wrap pointers if needed
  3884. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  3885. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  3886. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  3887. }
  3888. }
  3889. (void) pthread_cond_signal(&ctx->sq_empty);
  3890. (void) pthread_mutex_unlock(&ctx->mutex);
  3891. return !ctx->stop_flag;
  3892. }
  3893. static void worker_thread(struct mg_context *ctx) {
  3894. struct mg_connection *conn;
  3895. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
  3896. if (conn == NULL) {
  3897. cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
  3898. } else {
  3899. conn->buf_size = MAX_REQUEST_SIZE;
  3900. conn->buf = (char *) (conn + 1);
  3901. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  3902. // sq_empty condvar to wake up the master waiting in produce_socket()
  3903. while (consume_socket(ctx, &conn->client)) {
  3904. conn->birth_time = time(NULL);
  3905. conn->ctx = ctx;
  3906. // Fill in IP, port info early so even if SSL setup below fails,
  3907. // error handler would have the corresponding info.
  3908. // Thanks to Johannes Winkelmann for the patch.
  3909. // TODO(lsm): Fix IPv6 case
  3910. conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
  3911. memcpy(&conn->request_info.remote_ip,
  3912. &conn->client.rsa.sin.sin_addr.s_addr, 4);
  3913. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  3914. conn->request_info.is_ssl = conn->client.is_ssl;
  3915. if (!conn->client.is_ssl ||
  3916. (conn->client.is_ssl &&
  3917. sslize(conn, conn->ctx->ssl_ctx, SSL_accept))) {
  3918. process_new_connection(conn);
  3919. }
  3920. close_connection(conn);
  3921. }
  3922. free(conn);
  3923. }
  3924. // Signal master that we're done with connection and exiting
  3925. (void) pthread_mutex_lock(&ctx->mutex);
  3926. ctx->num_threads--;
  3927. (void) pthread_cond_signal(&ctx->cond);
  3928. assert(ctx->num_threads >= 0);
  3929. (void) pthread_mutex_unlock(&ctx->mutex);
  3930. DEBUG_TRACE(("exiting"));
  3931. }
  3932. // Master thread adds accepted socket to a queue
  3933. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  3934. (void) pthread_mutex_lock(&ctx->mutex);
  3935. // If the queue is full, wait
  3936. while (ctx->stop_flag == 0 &&
  3937. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  3938. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  3939. }
  3940. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  3941. // Copy socket to the queue and increment head
  3942. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  3943. ctx->sq_head++;
  3944. DEBUG_TRACE(("queued socket %d", sp->sock));
  3945. }
  3946. (void) pthread_cond_signal(&ctx->sq_full);
  3947. (void) pthread_mutex_unlock(&ctx->mutex);
  3948. }
  3949. static void accept_new_connection(const struct socket *listener,
  3950. struct mg_context *ctx) {
  3951. struct socket accepted;
  3952. char src_addr[20];
  3953. socklen_t len;
  3954. int allowed;
  3955. len = sizeof(accepted.rsa);
  3956. accepted.lsa = listener->lsa;
  3957. accepted.sock = accept(listener->sock, &accepted.rsa.sa, &len);
  3958. if (accepted.sock != INVALID_SOCKET) {
  3959. allowed = check_acl(ctx, ntohl(* (uint32_t *) &accepted.rsa.sin.sin_addr));
  3960. if (allowed) {
  3961. // Put accepted socket structure into the queue
  3962. DEBUG_TRACE(("accepted socket %d", accepted.sock));
  3963. accepted.is_ssl = listener->is_ssl;
  3964. produce_socket(ctx, &accepted);
  3965. } else {
  3966. sockaddr_to_string(src_addr, sizeof(src_addr), &accepted.rsa);
  3967. cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
  3968. (void) closesocket(accepted.sock);
  3969. }
  3970. }
  3971. }
  3972. static void master_thread(struct mg_context *ctx) {
  3973. fd_set read_set;
  3974. struct timeval tv;
  3975. struct socket *sp;
  3976. int max_fd;
  3977. // Increase priority of the master thread
  3978. #if defined(_WIN32)
  3979. SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
  3980. #endif
  3981. #if defined(ISSUE_317)
  3982. struct sched_param sched_param;
  3983. sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
  3984. pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
  3985. #endif
  3986. while (ctx->stop_flag == 0) {
  3987. FD_ZERO(&read_set);
  3988. max_fd = -1;
  3989. // Add listening sockets to the read set
  3990. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  3991. add_to_set(sp->sock, &read_set, &max_fd);
  3992. }
  3993. tv.tv_sec = 0;
  3994. tv.tv_usec = 200 * 1000;
  3995. if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
  3996. #ifdef _WIN32
  3997. // On windows, if read_set and write_set are empty,
  3998. // select() returns "Invalid parameter" error
  3999. // (at least on my Windows XP Pro). So in this case, we sleep here.
  4000. mg_sleep(1000);
  4001. #endif // _WIN32
  4002. } else {
  4003. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  4004. if (ctx->stop_flag == 0 && FD_ISSET(sp->sock, &read_set)) {
  4005. accept_new_connection(sp, ctx);
  4006. }
  4007. }
  4008. }
  4009. }
  4010. DEBUG_TRACE(("stopping workers"));
  4011. // Stop signal received: somebody called mg_stop. Quit.
  4012. close_all_listening_sockets(ctx);
  4013. // Wakeup workers that are waiting for connections to handle.
  4014. pthread_cond_broadcast(&ctx->sq_full);
  4015. // Wait until all threads finish
  4016. (void) pthread_mutex_lock(&ctx->mutex);
  4017. while (ctx->num_threads > 0) {
  4018. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  4019. }
  4020. (void) pthread_mutex_unlock(&ctx->mutex);
  4021. // All threads exited, no sync is needed. Destroy mutex and condvars
  4022. (void) pthread_mutex_destroy(&ctx->mutex);
  4023. (void) pthread_cond_destroy(&ctx->cond);
  4024. (void) pthread_cond_destroy(&ctx->sq_empty);
  4025. (void) pthread_cond_destroy(&ctx->sq_full);
  4026. #if !defined(NO_SSL)
  4027. uninitialize_ssl(ctx);
  4028. #endif
  4029. DEBUG_TRACE(("exiting"));
  4030. // Signal mg_stop() that we're done.
  4031. // WARNING: This must be the very last thing this
  4032. // thread does, as ctx becomes invalid after this line.
  4033. ctx->stop_flag = 2;
  4034. }
  4035. static void free_context(struct mg_context *ctx) {
  4036. int i;
  4037. // Deallocate config parameters
  4038. for (i = 0; i < NUM_OPTIONS; i++) {
  4039. if (ctx->config[i] != NULL)
  4040. free(ctx->config[i]);
  4041. }
  4042. // Deallocate SSL context
  4043. if (ctx->ssl_ctx != NULL) {
  4044. SSL_CTX_free(ctx->ssl_ctx);
  4045. }
  4046. if (ctx->client_ssl_ctx != NULL) {
  4047. SSL_CTX_free(ctx->client_ssl_ctx);
  4048. }
  4049. #ifndef NO_SSL
  4050. if (ssl_mutexes != NULL) {
  4051. free(ssl_mutexes);
  4052. ssl_mutexes = NULL;
  4053. }
  4054. #endif // !NO_SSL
  4055. // Deallocate context itself
  4056. free(ctx);
  4057. }
  4058. void mg_stop(struct mg_context *ctx) {
  4059. ctx->stop_flag = 1;
  4060. // Wait until mg_fini() stops
  4061. while (ctx->stop_flag != 2) {
  4062. (void) mg_sleep(10);
  4063. }
  4064. free_context(ctx);
  4065. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4066. (void) WSACleanup();
  4067. #endif // _WIN32
  4068. }
  4069. struct mg_context *mg_start(mg_callback_t user_callback, void *user_data,
  4070. const char **options) {
  4071. struct mg_context *ctx;
  4072. const char *name, *value, *default_value;
  4073. int i;
  4074. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  4075. WSADATA data;
  4076. WSAStartup(MAKEWORD(2,2), &data);
  4077. InitializeCriticalSection(&global_log_file_lock);
  4078. #endif // _WIN32
  4079. // Allocate context and initialize reasonable general case defaults.
  4080. // TODO(lsm): do proper error handling here.
  4081. if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
  4082. return NULL;
  4083. }
  4084. ctx->user_callback = user_callback;
  4085. ctx->user_data = user_data;
  4086. while (options && (name = *options++) != NULL) {
  4087. if ((i = get_option_index(name)) == -1) {
  4088. cry(fc(ctx), "Invalid option: %s", name);
  4089. free_context(ctx);
  4090. return NULL;
  4091. } else if ((value = *options++) == NULL) {
  4092. cry(fc(ctx), "%s: option value cannot be NULL", name);
  4093. free_context(ctx);
  4094. return NULL;
  4095. }
  4096. if (ctx->config[i] != NULL) {
  4097. cry(fc(ctx), "warning: %s: duplicate option", name);
  4098. }
  4099. ctx->config[i] = mg_strdup(value);
  4100. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  4101. }
  4102. // Set default value if needed
  4103. for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
  4104. default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
  4105. if (ctx->config[i] == NULL && default_value != NULL) {
  4106. ctx->config[i] = mg_strdup(default_value);
  4107. DEBUG_TRACE(("Setting default: [%s] -> [%s]",
  4108. config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
  4109. default_value));
  4110. }
  4111. }
  4112. // NOTE(lsm): order is important here. SSL certificates must
  4113. // be initialized before listening ports. UID must be set last.
  4114. if (!set_gpass_option(ctx) ||
  4115. #if !defined(NO_SSL)
  4116. !set_ssl_option(ctx) ||
  4117. #endif
  4118. !set_ports_option(ctx) ||
  4119. #if !defined(_WIN32)
  4120. !set_uid_option(ctx) ||
  4121. #endif
  4122. !set_acl_option(ctx)) {
  4123. free_context(ctx);
  4124. return NULL;
  4125. }
  4126. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  4127. // Ignore SIGPIPE signal, so if browser cancels the request, it
  4128. // won't kill the whole process.
  4129. (void) signal(SIGPIPE, SIG_IGN);
  4130. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  4131. (void) signal(SIGCHLD, SIG_IGN);
  4132. #endif // !_WIN32
  4133. (void) pthread_mutex_init(&ctx->mutex, NULL);
  4134. (void) pthread_cond_init(&ctx->cond, NULL);
  4135. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  4136. (void) pthread_cond_init(&ctx->sq_full, NULL);
  4137. // Start master (listening) thread
  4138. mg_start_thread((mg_thread_func_t) master_thread, ctx);
  4139. // Start worker threads
  4140. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  4141. if (mg_start_thread((mg_thread_func_t) worker_thread, ctx) != 0) {
  4142. cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
  4143. } else {
  4144. ctx->num_threads++;
  4145. }
  4146. }
  4147. return ctx;
  4148. }