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