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