mongoose.c 133 KB

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  1. // Copyright (c) 2004-2010 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. #define _XOPEN_SOURCE 600 // For flockfile() on Linux
  24. #define _LARGEFILE_SOURCE // Enable 64-bit file offsets
  25. #define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
  26. #endif
  27. #if defined(__SYMBIAN32__)
  28. #define NO_SSL // SSL is not supported
  29. #define NO_CGI // CGI is not supported
  30. #define PATH_MAX FILENAME_MAX
  31. #endif // __SYMBIAN32__
  32. #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
  33. #include <sys/types.h>
  34. #include <sys/stat.h>
  35. #include <errno.h>
  36. #include <signal.h>
  37. #include <fcntl.h>
  38. #endif // !_WIN32_WCE
  39. #include <time.h>
  40. #include <stdlib.h>
  41. #include <stdarg.h>
  42. #include <assert.h>
  43. #include <string.h>
  44. #include <ctype.h>
  45. #include <limits.h>
  46. #include <stddef.h>
  47. #include <stdio.h>
  48. #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
  49. #define _WIN32_WINNT 0x0400 // To make it link in VS2005
  50. #include <windows.h>
  51. #ifndef PATH_MAX
  52. #define PATH_MAX MAX_PATH
  53. #endif
  54. #ifndef _WIN32_WCE
  55. #include <process.h>
  56. #include <direct.h>
  57. #include <io.h>
  58. #else // _WIN32_WCE
  59. #include <winsock2.h>
  60. #define NO_CGI // WinCE has no pipes
  61. typedef long off_t;
  62. #define BUFSIZ 4096
  63. #define errno GetLastError()
  64. #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
  65. #endif // _WIN32_WCE
  66. #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
  67. ((uint64_t)((uint32_t)(hi))) << 32))
  68. #define RATE_DIFF 10000000 // 100 nsecs
  69. #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
  70. #define SYS2UNIX_TIME(lo, hi) \
  71. (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
  72. // Visual Studio 6 does not know __func__ or __FUNCTION__
  73. // The rest of MS compilers use __FUNCTION__, not C99 __func__
  74. // Also use _strtoui64 on modern M$ compilers
  75. #if defined(_MSC_VER) && _MSC_VER < 1300
  76. #define STRX(x) #x
  77. #define STR(x) STRX(x)
  78. #define __func__ "line " STR(__LINE__)
  79. #define strtoull(x, y, z) strtoul(x, y, z)
  80. #define strtoll(x, y, z) strtol(x, y, z)
  81. #else
  82. #define __func__ __FUNCTION__
  83. #define strtoull(x, y, z) _strtoui64(x, y, z)
  84. #define strtoll(x, y, z) _strtoi64(x, y, z)
  85. #endif // _MSC_VER
  86. #define ERRNO GetLastError()
  87. #define NO_SOCKLEN_T
  88. #define SSL_LIB "ssleay32.dll"
  89. #define CRYPTO_LIB "libeay32.dll"
  90. #define DIRSEP '\\'
  91. #define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\')
  92. #define O_NONBLOCK 0
  93. #if !defined(EWOULDBLOCK)
  94. #define EWOULDBLOCK WSAEWOULDBLOCK
  95. #endif // !EWOULDBLOCK
  96. #define _POSIX_
  97. #define INT64_FMT "I64d"
  98. #define WINCDECL __cdecl
  99. #define SHUT_WR 1
  100. #define snprintf _snprintf
  101. #define vsnprintf _vsnprintf
  102. #define sleep(x) Sleep((x) * 1000)
  103. #define pipe(x) _pipe(x, BUFSIZ, _O_BINARY)
  104. #define popen(x, y) _popen(x, y)
  105. #define pclose(x) _pclose(x)
  106. #define close(x) _close(x)
  107. #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
  108. #define RTLD_LAZY 0
  109. #define fseeko(x, y, z) fseek((x), (y), (z))
  110. #define fdopen(x, y) _fdopen((x), (y))
  111. #define write(x, y, z) _write((x), (y), (unsigned) z)
  112. #define read(x, y, z) _read((x), (y), (unsigned) z)
  113. #define flockfile(x) (void) 0
  114. #define funlockfile(x) (void) 0
  115. #if !defined(fileno)
  116. #define fileno(x) _fileno(x)
  117. #endif // !fileno MINGW #defines fileno
  118. typedef HANDLE pthread_mutex_t;
  119. typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
  120. typedef DWORD pthread_t;
  121. #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
  122. struct timespec {
  123. long tv_nsec;
  124. long tv_sec;
  125. };
  126. static int pthread_mutex_lock(pthread_mutex_t *);
  127. static int pthread_mutex_unlock(pthread_mutex_t *);
  128. static FILE *mg_fopen(const char *path, const char *mode);
  129. #if defined(HAVE_STDINT)
  130. #include <stdint.h>
  131. #else
  132. typedef unsigned int uint32_t;
  133. typedef unsigned short uint16_t;
  134. typedef unsigned __int64 uint64_t;
  135. typedef __int64 int64_t;
  136. #define INT64_MAX 9223372036854775807
  137. #endif // HAVE_STDINT
  138. // POSIX dirent interface
  139. struct dirent {
  140. char d_name[PATH_MAX];
  141. };
  142. typedef struct DIR {
  143. HANDLE handle;
  144. WIN32_FIND_DATAW info;
  145. struct dirent result;
  146. } DIR;
  147. #else // UNIX specific
  148. #include <sys/wait.h>
  149. #include <sys/socket.h>
  150. #include <sys/select.h>
  151. #include <netinet/in.h>
  152. #include <arpa/inet.h>
  153. #include <sys/time.h>
  154. #include <stdint.h>
  155. #include <inttypes.h>
  156. #include <netdb.h>
  157. #include <pwd.h>
  158. #include <unistd.h>
  159. #include <dirent.h>
  160. #if !defined(NO_SSL_DL) && !defined(NO_SSL)
  161. #include <dlfcn.h>
  162. #endif
  163. #include <pthread.h>
  164. #if defined(__MACH__)
  165. #define SSL_LIB "libssl.dylib"
  166. #define CRYPTO_LIB "libcrypto.dylib"
  167. #else
  168. #if !defined(SSL_LIB)
  169. #define SSL_LIB "libssl.so"
  170. #endif
  171. #if !defined(CRYPTO_LIB)
  172. #define CRYPTO_LIB "libcrypto.so"
  173. #endif
  174. #endif
  175. #define DIRSEP '/'
  176. #define IS_DIRSEP_CHAR(c) ((c) == '/')
  177. #ifndef O_BINARY
  178. #define O_BINARY 0
  179. #endif // O_BINARY
  180. #define closesocket(a) close(a)
  181. #define mg_fopen(x, y) fopen(x, y)
  182. #define mg_mkdir(x, y) mkdir(x, y)
  183. #define mg_remove(x) remove(x)
  184. #define mg_rename(x, y) rename(x, y)
  185. #define ERRNO errno
  186. #define INVALID_SOCKET (-1)
  187. #define INT64_FMT PRId64
  188. typedef int SOCKET;
  189. #define WINCDECL
  190. #endif // End of Windows and UNIX specific includes
  191. #include "mongoose.h"
  192. #define MONGOOSE_VERSION "3.1"
  193. #define PASSWORDS_FILE_NAME ".htpasswd"
  194. #define CGI_ENVIRONMENT_SIZE 4096
  195. #define MAX_CGI_ENVIR_VARS 64
  196. #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
  197. #if defined(DEBUG)
  198. #define DEBUG_TRACE(x) do { \
  199. flockfile(stdout); \
  200. printf("*** %lu.%p.%s.%d: ", \
  201. (unsigned long) time(NULL), (void *) pthread_self(), \
  202. __func__, __LINE__); \
  203. printf x; \
  204. putchar('\n'); \
  205. fflush(stdout); \
  206. funlockfile(stdout); \
  207. } while (0)
  208. #else
  209. #define DEBUG_TRACE(x)
  210. #endif // DEBUG
  211. // Darwin prior to 7.0 and Win32 do not have socklen_t
  212. #ifdef NO_SOCKLEN_T
  213. typedef int socklen_t;
  214. #endif // NO_SOCKLEN_T
  215. typedef void * (*mg_thread_func_t)(void *);
  216. static const char *http_500_error = "Internal Server Error";
  217. // Snatched from OpenSSL includes. I put the prototypes here to be independent
  218. // from the OpenSSL source installation. Having this, mongoose + SSL can be
  219. // built on any system with binary SSL libraries installed.
  220. typedef struct ssl_st SSL;
  221. typedef struct ssl_method_st SSL_METHOD;
  222. typedef struct ssl_ctx_st SSL_CTX;
  223. #define SSL_ERROR_WANT_READ 2
  224. #define SSL_ERROR_WANT_WRITE 3
  225. #define SSL_FILETYPE_PEM 1
  226. #define CRYPTO_LOCK 1
  227. #if defined(NO_SSL_DL)
  228. extern void SSL_free(SSL *);
  229. extern int SSL_accept(SSL *);
  230. extern int SSL_connect(SSL *);
  231. extern int SSL_read(SSL *, void *, int);
  232. extern int SSL_write(SSL *, const void *, int);
  233. extern int SSL_get_error(const SSL *, int);
  234. extern int SSL_set_fd(SSL *, int);
  235. extern SSL *SSL_new(SSL_CTX *);
  236. extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
  237. extern SSL_METHOD *SSLv23_server_method(void);
  238. extern int SSL_library_init(void);
  239. extern void SSL_load_error_strings(void);
  240. extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
  241. extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
  242. extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
  243. extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
  244. extern void SSL_CTX_free(SSL_CTX *);
  245. extern unsigned long ERR_get_error(void);
  246. extern char *ERR_error_string(unsigned long, char *);
  247. extern int CRYPTO_num_locks(void);
  248. extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
  249. extern void CRYPTO_set_id_callback(unsigned long (*)(void));
  250. #else
  251. // Dynamically loaded SSL functionality
  252. struct ssl_func {
  253. const char *name; // SSL function name
  254. void (*ptr)(void); // Function pointer
  255. };
  256. #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
  257. #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
  258. #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
  259. #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
  260. #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
  261. #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
  262. #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
  263. #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
  264. #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
  265. #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
  266. #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
  267. #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
  268. const char *, int)) ssl_sw[11].ptr)
  269. #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
  270. const char *, int)) ssl_sw[12].ptr)
  271. #define SSL_CTX_set_default_passwd_cb \
  272. (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
  273. #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
  274. #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
  275. #define SSL_CTX_use_certificate_chain_file \
  276. (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
  277. #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
  278. #define CRYPTO_set_locking_callback \
  279. (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
  280. #define CRYPTO_set_id_callback \
  281. (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
  282. #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
  283. #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
  284. // set_ssl_option() function updates this array.
  285. // It loads SSL library dynamically and changes NULLs to the actual addresses
  286. // of respective functions. The macros above (like SSL_connect()) are really
  287. // just calling these functions indirectly via the pointer.
  288. static struct ssl_func ssl_sw[] = {
  289. {"SSL_free", NULL},
  290. {"SSL_accept", NULL},
  291. {"SSL_connect", NULL},
  292. {"SSL_read", NULL},
  293. {"SSL_write", NULL},
  294. {"SSL_get_error", NULL},
  295. {"SSL_set_fd", NULL},
  296. {"SSL_new", NULL},
  297. {"SSL_CTX_new", NULL},
  298. {"SSLv23_server_method", NULL},
  299. {"SSL_library_init", NULL},
  300. {"SSL_CTX_use_PrivateKey_file", NULL},
  301. {"SSL_CTX_use_certificate_file",NULL},
  302. {"SSL_CTX_set_default_passwd_cb",NULL},
  303. {"SSL_CTX_free", NULL},
  304. {"SSL_load_error_strings", NULL},
  305. {"SSL_CTX_use_certificate_chain_file", NULL},
  306. {NULL, NULL}
  307. };
  308. // Similar array as ssl_sw. These functions could be located in different lib.
  309. static struct ssl_func crypto_sw[] = {
  310. {"CRYPTO_num_locks", NULL},
  311. {"CRYPTO_set_locking_callback", NULL},
  312. {"CRYPTO_set_id_callback", NULL},
  313. {"ERR_get_error", NULL},
  314. {"ERR_error_string", NULL},
  315. {NULL, NULL}
  316. };
  317. #endif // NO_SSL_DL
  318. static const char *month_names[] = {
  319. "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  320. "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  321. };
  322. // Unified socket address. For IPv6 support, add IPv6 address structure
  323. // in the union u.
  324. struct usa {
  325. socklen_t len;
  326. union {
  327. struct sockaddr sa;
  328. struct sockaddr_in sin;
  329. } u;
  330. };
  331. // Describes a string (chunk of memory).
  332. struct vec {
  333. const char *ptr;
  334. size_t len;
  335. };
  336. // Structure used by mg_stat() function. Uses 64 bit file length.
  337. struct mgstat {
  338. int is_directory; // Directory marker
  339. int64_t size; // File size
  340. time_t mtime; // Modification time
  341. };
  342. // Describes listening socket, or socket which was accept()-ed by the master
  343. // thread and queued for future handling by the worker thread.
  344. struct socket {
  345. struct socket *next; // Linkage
  346. SOCKET sock; // Listening socket
  347. struct usa lsa; // Local socket address
  348. struct usa rsa; // Remote socket address
  349. int is_ssl; // Is socket SSL-ed
  350. int is_proxy;
  351. };
  352. enum {
  353. CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
  354. PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE,
  355. SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
  356. GLOBAL_PASSWORDS_FILE, INDEX_FILES,
  357. ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE,
  358. EXTRA_MIME_TYPES, LISTENING_PORTS,
  359. DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER,
  360. NUM_OPTIONS
  361. };
  362. static const char *config_options[] = {
  363. "C", "cgi_extensions", ".cgi,.pl,.php",
  364. "E", "cgi_environment", NULL,
  365. "G", "put_delete_passwords_file", NULL,
  366. "I", "cgi_interpreter", NULL,
  367. "P", "protect_uri", NULL,
  368. "R", "authentication_domain", "mydomain.com",
  369. "S", "ssi_extensions", ".shtml,.shtm",
  370. "a", "access_log_file", NULL,
  371. "c", "ssl_chain_file", NULL,
  372. "d", "enable_directory_listing", "yes",
  373. "e", "error_log_file", NULL,
  374. "g", "global_passwords_file", NULL,
  375. "i", "index_files", "index.html,index.htm,index.cgi",
  376. "k", "enable_keep_alive", "no",
  377. "l", "access_control_list", NULL,
  378. "M", "max_request_size", "16384",
  379. "m", "extra_mime_types", NULL,
  380. "p", "listening_ports", "8080",
  381. "r", "document_root", ".",
  382. "s", "ssl_certificate", NULL,
  383. "t", "num_threads", "10",
  384. "u", "run_as_user", NULL,
  385. NULL
  386. };
  387. #define ENTRIES_PER_CONFIG_OPTION 3
  388. struct mg_context {
  389. volatile int stop_flag; // Should we stop event loop
  390. SSL_CTX *ssl_ctx; // SSL context
  391. char *config[NUM_OPTIONS]; // Mongoose configuration parameters
  392. mg_callback_t user_callback; // User-defined callback function
  393. void *user_data; // User-defined data
  394. struct socket *listening_sockets;
  395. volatile int num_threads; // Number of threads
  396. pthread_mutex_t mutex; // Protects (max|num)_threads
  397. pthread_cond_t cond; // Condvar for tracking workers terminations
  398. struct socket queue[20]; // Accepted sockets
  399. volatile int sq_head; // Head of the socket queue
  400. volatile int sq_tail; // Tail of the socket queue
  401. pthread_cond_t sq_full; // Singaled when socket is produced
  402. pthread_cond_t sq_empty; // Signaled when socket is consumed
  403. };
  404. struct mg_connection {
  405. struct mg_connection *peer; // Remote target in proxy mode
  406. struct mg_request_info request_info;
  407. struct mg_context *ctx;
  408. SSL *ssl; // SSL descriptor
  409. struct socket client; // Connected client
  410. time_t birth_time; // Time connection was accepted
  411. int64_t num_bytes_sent; // Total bytes sent to client
  412. int64_t content_len; // Content-Length header value
  413. int64_t consumed_content; // How many bytes of content is already read
  414. char *buf; // Buffer for received data
  415. int buf_size; // Buffer size
  416. int request_len; // Size of the request + headers in a buffer
  417. int data_len; // Total size of data in a buffer
  418. };
  419. const char **mg_get_valid_option_names(void) {
  420. return config_options;
  421. }
  422. static void *call_user(struct mg_connection *conn, enum mg_event event) {
  423. conn->request_info.user_data = conn->ctx->user_data;
  424. return conn->ctx->user_callback == NULL ? NULL :
  425. conn->ctx->user_callback(event, conn, &conn->request_info);
  426. }
  427. static int get_option_index(const char *name) {
  428. int i;
  429. for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
  430. if (strcmp(config_options[i], name) == 0 ||
  431. strcmp(config_options[i + 1], name) == 0) {
  432. return i / ENTRIES_PER_CONFIG_OPTION;
  433. }
  434. }
  435. return -1;
  436. }
  437. const char *mg_get_option(const struct mg_context *ctx, const char *name) {
  438. int i;
  439. if ((i = get_option_index(name)) == -1) {
  440. return NULL;
  441. } else if (ctx->config[i] == NULL) {
  442. return "";
  443. } else {
  444. return ctx->config[i];
  445. }
  446. }
  447. // Print error message to the opened error log stream.
  448. static void cry(struct mg_connection *conn, const char *fmt, ...) {
  449. char buf[BUFSIZ];
  450. va_list ap;
  451. FILE *fp;
  452. time_t timestamp;
  453. va_start(ap, fmt);
  454. (void) vsnprintf(buf, sizeof(buf), fmt, ap);
  455. va_end(ap);
  456. // Do not lock when getting the callback value, here and below.
  457. // I suppose this is fine, since function cannot disappear in the
  458. // same way string option can.
  459. conn->request_info.log_message = buf;
  460. if (call_user(conn, MG_EVENT_LOG) == NULL) {
  461. fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
  462. mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
  463. if (fp != NULL) {
  464. flockfile(fp);
  465. timestamp = time(NULL);
  466. (void) fprintf(fp,
  467. "[%010lu] [error] [client %s] ",
  468. (unsigned long) timestamp,
  469. inet_ntoa(conn->client.rsa.u.sin.sin_addr));
  470. if (conn->request_info.request_method != NULL) {
  471. (void) fprintf(fp, "%s %s: ",
  472. conn->request_info.request_method,
  473. conn->request_info.uri);
  474. }
  475. (void) fprintf(fp, "%s", buf);
  476. fputc('\n', fp);
  477. funlockfile(fp);
  478. if (fp != stderr) {
  479. fclose(fp);
  480. }
  481. }
  482. }
  483. conn->request_info.log_message = NULL;
  484. }
  485. // Return OpenSSL error message
  486. static const char *ssl_error(void) {
  487. unsigned long err;
  488. err = ERR_get_error();
  489. return err == 0 ? "" : ERR_error_string(err, NULL);
  490. }
  491. // Return fake connection structure. Used for logging, if connection
  492. // is not applicable at the moment of logging.
  493. static struct mg_connection *fc(struct mg_context *ctx) {
  494. static struct mg_connection fake_connection;
  495. fake_connection.ctx = ctx;
  496. return &fake_connection;
  497. }
  498. const char *mg_version(void) {
  499. return MONGOOSE_VERSION;
  500. }
  501. static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
  502. for (; *src != '\0' && n > 1; n--) {
  503. *dst++ = *src++;
  504. }
  505. *dst = '\0';
  506. }
  507. static int lowercase(const char *s) {
  508. return tolower(* (const unsigned char *) s);
  509. }
  510. static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
  511. int diff = 0;
  512. if (len > 0)
  513. do {
  514. diff = lowercase(s1++) - lowercase(s2++);
  515. } while (diff == 0 && s1[-1] != '\0' && --len > 0);
  516. return diff;
  517. }
  518. static int mg_strcasecmp(const char *s1, const char *s2) {
  519. int diff;
  520. do {
  521. diff = lowercase(s1++) - lowercase(s2++);
  522. } while (diff == 0 && s1[-1] != '\0');
  523. return diff;
  524. }
  525. static char * mg_strndup(const char *ptr, size_t len) {
  526. char *p;
  527. if ((p = (char *) malloc(len + 1)) != NULL) {
  528. mg_strlcpy(p, ptr, len + 1);
  529. }
  530. return p;
  531. }
  532. static char * mg_strdup(const char *str) {
  533. return mg_strndup(str, strlen(str));
  534. }
  535. // Like snprintf(), but never returns negative value, or the value
  536. // that is larger than a supplied buffer.
  537. // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
  538. // in his audit report.
  539. static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
  540. const char *fmt, va_list ap) {
  541. int n;
  542. if (buflen == 0)
  543. return 0;
  544. n = vsnprintf(buf, buflen, fmt, ap);
  545. if (n < 0) {
  546. cry(conn, "vsnprintf error");
  547. n = 0;
  548. } else if (n >= (int) buflen) {
  549. cry(conn, "truncating vsnprintf buffer: [%.*s]",
  550. n > 200 ? 200 : n, buf);
  551. n = (int) buflen - 1;
  552. }
  553. buf[n] = '\0';
  554. return n;
  555. }
  556. static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
  557. const char *fmt, ...) {
  558. va_list ap;
  559. int n;
  560. va_start(ap, fmt);
  561. n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
  562. va_end(ap);
  563. return n;
  564. }
  565. // Skip the characters until one of the delimiters characters found.
  566. // 0-terminate resulting word. Skip the delimiter and following whitespaces if any.
  567. // Advance pointer to buffer to the next word. Return found 0-terminated word.
  568. // Delimiters can be quoted with quotechar.
  569. static char *skip_quoted(char **buf, const char *delimiters, const char *whitespace, char quotechar) {
  570. char *p, *begin_word, *end_word, *end_whitespace;
  571. begin_word = *buf;
  572. end_word = begin_word + strcspn(begin_word, delimiters);
  573. // Check for quotechar
  574. if (end_word > begin_word) {
  575. p = end_word - 1;
  576. while (*p == quotechar) {
  577. // If there is anything beyond end_word, copy it
  578. if (*end_word == '\0') {
  579. *p = '\0';
  580. break;
  581. } else {
  582. size_t end_off = strcspn(end_word + 1, delimiters);
  583. memmove (p, end_word, end_off + 1);
  584. p += end_off; // p must correspond to end_word - 1
  585. end_word += end_off + 1;
  586. }
  587. }
  588. for (p++; p < end_word; p++) {
  589. *p = '\0';
  590. }
  591. }
  592. if (*end_word == '\0') {
  593. *buf = end_word;
  594. } else {
  595. end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
  596. for (p = end_word; p < end_whitespace; p++) {
  597. *p = '\0';
  598. }
  599. *buf = end_whitespace;
  600. }
  601. return begin_word;
  602. }
  603. // Simplified version of skip_quoted without quote char
  604. // and whitespace == delimiters
  605. static char *skip(char **buf, const char *delimiters) {
  606. return skip_quoted(buf, delimiters, delimiters, 0);
  607. }
  608. // Return HTTP header value, or NULL if not found.
  609. static const char *get_header(const struct mg_request_info *ri,
  610. const char *name) {
  611. int i;
  612. for (i = 0; i < ri->num_headers; i++)
  613. if (!mg_strcasecmp(name, ri->http_headers[i].name))
  614. return ri->http_headers[i].value;
  615. return NULL;
  616. }
  617. const char *mg_get_header(const struct mg_connection *conn, const char *name) {
  618. return get_header(&conn->request_info, name);
  619. }
  620. // A helper function for traversing comma separated list of values.
  621. // It returns a list pointer shifted to the next value, of NULL if the end
  622. // of the list found.
  623. // Value is stored in val vector. If value has form "x=y", then eq_val
  624. // vector is initialized to point to the "y" part, and val vector length
  625. // is adjusted to point only to "x".
  626. static const char *next_option(const char *list, struct vec *val,
  627. struct vec *eq_val) {
  628. if (list == NULL || *list == '\0') {
  629. // End of the list
  630. list = NULL;
  631. } else {
  632. val->ptr = list;
  633. if ((list = strchr(val->ptr, ',')) != NULL) {
  634. // Comma found. Store length and shift the list ptr
  635. val->len = list - val->ptr;
  636. list++;
  637. } else {
  638. // This value is the last one
  639. list = val->ptr + strlen(val->ptr);
  640. val->len = list - val->ptr;
  641. }
  642. if (eq_val != NULL) {
  643. // Value has form "x=y", adjust pointers and lengths
  644. // so that val points to "x", and eq_val points to "y".
  645. eq_val->len = 0;
  646. eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
  647. if (eq_val->ptr != NULL) {
  648. eq_val->ptr++; // Skip over '=' character
  649. eq_val->len = val->ptr + val->len - eq_val->ptr;
  650. val->len = (eq_val->ptr - val->ptr) - 1;
  651. }
  652. }
  653. }
  654. return list;
  655. }
  656. static int match_extension(const char *path, const char *ext_list) {
  657. struct vec ext_vec;
  658. size_t path_len;
  659. path_len = strlen(path);
  660. while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
  661. if (ext_vec.len < path_len &&
  662. mg_strncasecmp(path + path_len - ext_vec.len,
  663. ext_vec.ptr, ext_vec.len) == 0)
  664. return 1;
  665. return 0;
  666. }
  667. // HTTP 1.1 assumes keep alive if "Connection:" header is not set
  668. // This function must tolerate situations when connection info is not
  669. // set up, for example if request parsing failed.
  670. static int should_keep_alive(const struct mg_connection *conn) {
  671. const char *http_version = conn->request_info.http_version;
  672. const char *header = mg_get_header(conn, "Connection");
  673. return (header == NULL && http_version && !strcmp(http_version, "1.1")) ||
  674. (header != NULL && !mg_strcasecmp(header, "keep-alive"));
  675. }
  676. static const char *suggest_connection_header(const struct mg_connection *conn) {
  677. return should_keep_alive(conn) ? "keep-alive" : "close";
  678. }
  679. static void send_http_error(struct mg_connection *conn, int status,
  680. const char *reason, const char *fmt, ...) {
  681. char buf[BUFSIZ];
  682. va_list ap;
  683. int len;
  684. conn->request_info.status_code = status;
  685. if (call_user(conn, MG_HTTP_ERROR) == NULL) {
  686. buf[0] = '\0';
  687. len = 0;
  688. // Errors 1xx, 204 and 304 MUST NOT send a body
  689. if (status > 199 && status != 204 && status != 304) {
  690. len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
  691. cry(conn, "%s", buf);
  692. buf[len++] = '\n';
  693. va_start(ap, fmt);
  694. len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
  695. va_end(ap);
  696. }
  697. DEBUG_TRACE(("[%s]", buf));
  698. mg_printf(conn, "HTTP/1.1 %d %s\r\n"
  699. "Content-Type: text/plain\r\n"
  700. "Content-Length: %d\r\n"
  701. "Connection: %s\r\n\r\n", status, reason, len,
  702. suggest_connection_header(conn));
  703. conn->num_bytes_sent += mg_printf(conn, "%s", buf);
  704. }
  705. }
  706. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  707. static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
  708. unused = NULL;
  709. *mutex = CreateMutex(NULL, FALSE, NULL);
  710. return *mutex == NULL ? -1 : 0;
  711. }
  712. static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
  713. return CloseHandle(*mutex) == 0 ? -1 : 0;
  714. }
  715. static int pthread_mutex_lock(pthread_mutex_t *mutex) {
  716. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  717. }
  718. static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
  719. return ReleaseMutex(*mutex) == 0 ? -1 : 0;
  720. }
  721. static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
  722. unused = NULL;
  723. cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
  724. cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
  725. return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
  726. }
  727. static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
  728. HANDLE handles[] = {cv->signal, cv->broadcast};
  729. ReleaseMutex(*mutex);
  730. WaitForMultipleObjects(2, handles, FALSE, INFINITE);
  731. return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
  732. }
  733. static int pthread_cond_signal(pthread_cond_t *cv) {
  734. return SetEvent(cv->signal) == 0 ? -1 : 0;
  735. }
  736. static int pthread_cond_broadcast(pthread_cond_t *cv) {
  737. // Implementation with PulseEvent() has race condition, see
  738. // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
  739. return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
  740. }
  741. static int pthread_cond_destroy(pthread_cond_t *cv) {
  742. return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
  743. }
  744. static pthread_t pthread_self(void) {
  745. return GetCurrentThreadId();
  746. }
  747. // For Windows, change all slashes to backslashes in path names.
  748. static void change_slashes_to_backslashes(char *path) {
  749. int i;
  750. for (i = 0; path[i] != '\0'; i++) {
  751. if (path[i] == '/')
  752. path[i] = '\\';
  753. // i > 0 check is to preserve UNC paths, like \\server\file.txt
  754. if (path[i] == '\\' && i > 0)
  755. while (path[i + 1] == '\\' || path[i + 1] == '/')
  756. (void) memmove(path + i + 1,
  757. path + i + 2, strlen(path + i + 1));
  758. }
  759. }
  760. // Encode 'path' which is assumed UTF-8 string, into UNICODE string.
  761. // wbuf and wbuf_len is a target buffer and its length.
  762. static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
  763. char buf[PATH_MAX], buf2[PATH_MAX], *p;
  764. mg_strlcpy(buf, path, sizeof(buf));
  765. change_slashes_to_backslashes(buf);
  766. // Point p to the end of the file name
  767. p = buf + strlen(buf) - 1;
  768. // Trim trailing backslash character
  769. while (p > buf && *p == '\\' && p[-1] != ':') {
  770. *p-- = '\0';
  771. }
  772. // Protect from CGI code disclosure.
  773. // This is very nasty hole. Windows happily opens files with
  774. // some garbage in the end of file name. So fopen("a.cgi ", "r")
  775. // actually opens "a.cgi", and does not return an error!
  776. if (*p == 0x20 || // No space at the end
  777. (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path
  778. *p == 0x2b || // No '+'
  779. (*p & ~0x7f)) { // And generally no non-ascii chars
  780. (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
  781. wbuf[0] = L'\0';
  782. } else {
  783. // Convert to Unicode and back. If doubly-converted string does not
  784. // match the original, something is fishy, reject.
  785. MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
  786. WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
  787. NULL, NULL);
  788. if (strcmp(buf, buf2) != 0) {
  789. wbuf[0] = L'\0';
  790. }
  791. }
  792. }
  793. #if defined(_WIN32_WCE)
  794. static time_t time(time_t *ptime) {
  795. time_t t;
  796. SYSTEMTIME st;
  797. FILETIME ft;
  798. GetSystemTime(&st);
  799. SystemTimeToFileTime(&st, &ft);
  800. t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
  801. if (ptime != NULL) {
  802. *ptime = t;
  803. }
  804. return t;
  805. }
  806. static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
  807. int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
  808. FILETIME ft, lft;
  809. SYSTEMTIME st;
  810. TIME_ZONE_INFORMATION tzinfo;
  811. if (ptm == NULL) {
  812. return NULL;
  813. }
  814. * (int64_t *) &ft = t;
  815. FileTimeToLocalFileTime(&ft, &lft);
  816. FileTimeToSystemTime(&lft, &st);
  817. ptm->tm_year = st.wYear - 1900;
  818. ptm->tm_mon = st.wMonth - 1;
  819. ptm->tm_wday = st.wDayOfWeek;
  820. ptm->tm_mday = st.wDay;
  821. ptm->tm_hour = st.wHour;
  822. ptm->tm_min = st.wMinute;
  823. ptm->tm_sec = st.wSecond;
  824. ptm->tm_yday = 0; // hope nobody uses this
  825. ptm->tm_isdst =
  826. GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
  827. return ptm;
  828. }
  829. static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
  830. // FIXME(lsm): fix this.
  831. return localtime(ptime, ptm);
  832. }
  833. static size_t strftime(char *dst, size_t dst_size, const char *fmt,
  834. const struct tm *tm) {
  835. (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
  836. return 0;
  837. }
  838. #endif
  839. static int mg_rename(const char* oldname, const char* newname) {
  840. wchar_t woldbuf[PATH_MAX];
  841. wchar_t wnewbuf[PATH_MAX];
  842. to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
  843. to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
  844. return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
  845. }
  846. static FILE *mg_fopen(const char *path, const char *mode) {
  847. wchar_t wbuf[PATH_MAX], wmode[20];
  848. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  849. MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
  850. return _wfopen(wbuf, wmode);
  851. }
  852. static int mg_stat(const char *path, struct mgstat *stp) {
  853. int ok = -1; // Error
  854. wchar_t wbuf[PATH_MAX];
  855. WIN32_FILE_ATTRIBUTE_DATA info;
  856. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  857. if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
  858. stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
  859. stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
  860. info.ftLastWriteTime.dwHighDateTime);
  861. stp->is_directory =
  862. info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  863. ok = 0; // Success
  864. }
  865. return ok;
  866. }
  867. static int mg_remove(const char *path) {
  868. wchar_t wbuf[PATH_MAX];
  869. to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
  870. return DeleteFileW(wbuf) ? 0 : -1;
  871. }
  872. static int mg_mkdir(const char *path, int mode) {
  873. char buf[PATH_MAX];
  874. wchar_t wbuf[PATH_MAX];
  875. mode = 0; // Unused
  876. mg_strlcpy(buf, path, sizeof(buf));
  877. change_slashes_to_backslashes(buf);
  878. (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
  879. return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
  880. }
  881. // Implementation of POSIX opendir/closedir/readdir for Windows.
  882. static DIR * opendir(const char *name) {
  883. DIR *dir = NULL;
  884. wchar_t wpath[PATH_MAX];
  885. DWORD attrs;
  886. if (name == NULL) {
  887. SetLastError(ERROR_BAD_ARGUMENTS);
  888. } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
  889. SetLastError(ERROR_NOT_ENOUGH_MEMORY);
  890. } else {
  891. to_unicode(name, wpath, ARRAY_SIZE(wpath));
  892. attrs = GetFileAttributesW(wpath);
  893. if (attrs != 0xFFFFFFFF &&
  894. ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
  895. (void) wcscat(wpath, L"\\*");
  896. dir->handle = FindFirstFileW(wpath, &dir->info);
  897. dir->result.d_name[0] = '\0';
  898. } else {
  899. free(dir);
  900. dir = NULL;
  901. }
  902. }
  903. return dir;
  904. }
  905. static int closedir(DIR *dir) {
  906. int result = 0;
  907. if (dir != NULL) {
  908. if (dir->handle != INVALID_HANDLE_VALUE)
  909. result = FindClose(dir->handle) ? 0 : -1;
  910. free(dir);
  911. } else {
  912. result = -1;
  913. SetLastError(ERROR_BAD_ARGUMENTS);
  914. }
  915. return result;
  916. }
  917. struct dirent * readdir(DIR *dir) {
  918. struct dirent *result = 0;
  919. if (dir) {
  920. if (dir->handle != INVALID_HANDLE_VALUE) {
  921. result = &dir->result;
  922. (void) WideCharToMultiByte(CP_UTF8, 0,
  923. dir->info.cFileName, -1, result->d_name,
  924. sizeof(result->d_name), NULL, NULL);
  925. if (!FindNextFileW(dir->handle, &dir->info)) {
  926. (void) FindClose(dir->handle);
  927. dir->handle = INVALID_HANDLE_VALUE;
  928. }
  929. } else {
  930. SetLastError(ERROR_FILE_NOT_FOUND);
  931. }
  932. } else {
  933. SetLastError(ERROR_BAD_ARGUMENTS);
  934. }
  935. return result;
  936. }
  937. #define set_close_on_exec(fd) // No FD_CLOEXEC on Windows
  938. static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
  939. void *param) {
  940. HANDLE hThread;
  941. ctx = NULL; // Unused
  942. hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) func, param, 0,
  943. NULL);
  944. if (hThread != NULL) {
  945. (void) CloseHandle(hThread);
  946. }
  947. return hThread == NULL ? -1 : 0;
  948. }
  949. static HANDLE dlopen(const char *dll_name, int flags) {
  950. wchar_t wbuf[PATH_MAX];
  951. flags = 0; // Unused
  952. to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
  953. return LoadLibraryW(wbuf);
  954. }
  955. #if !defined(NO_CGI)
  956. #define SIGKILL 0
  957. static int kill(pid_t pid, int sig_num) {
  958. (void) TerminateProcess(pid, sig_num);
  959. (void) CloseHandle(pid);
  960. return 0;
  961. }
  962. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  963. char *envblk, char *envp[], int fd_stdin,
  964. int fd_stdout, const char *dir) {
  965. HANDLE me;
  966. char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX];
  967. FILE *fp;
  968. STARTUPINFOA si;
  969. PROCESS_INFORMATION pi;
  970. envp = NULL; // Unused
  971. (void) memset(&si, 0, sizeof(si));
  972. (void) memset(&pi, 0, sizeof(pi));
  973. // TODO(lsm): redirect CGI errors to the error log file
  974. si.cb = sizeof(si);
  975. si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
  976. si.wShowWindow = SW_HIDE;
  977. me = GetCurrentProcess();
  978. (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
  979. &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  980. (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
  981. &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
  982. // If CGI file is a script, try to read the interpreter line
  983. interp = conn->ctx->config[CGI_INTERPRETER];
  984. if (interp == NULL) {
  985. buf[2] = '\0';
  986. mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s", dir, DIRSEP, prog);
  987. if ((fp = fopen(cmdline, "r")) != NULL) {
  988. (void) fgets(buf, sizeof(buf), fp);
  989. if (buf[0] != '#' || buf[1] != '!') {
  990. // First line does not start with "#!". Do not set interpreter.
  991. buf[2] = '\0';
  992. } else {
  993. // Trim whitespaces in interpreter name
  994. for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) {
  995. *p = '\0';
  996. }
  997. }
  998. (void) fclose(fp);
  999. }
  1000. interp = buf + 2;
  1001. }
  1002. (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s",
  1003. interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog);
  1004. DEBUG_TRACE(("Running [%s]", cmdline));
  1005. if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
  1006. CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
  1007. cry(conn, "%s: CreateProcess(%s): %d",
  1008. __func__, cmdline, ERRNO);
  1009. pi.hProcess = (pid_t) -1;
  1010. } else {
  1011. (void) close(fd_stdin);
  1012. (void) close(fd_stdout);
  1013. }
  1014. (void) CloseHandle(si.hStdOutput);
  1015. (void) CloseHandle(si.hStdInput);
  1016. (void) CloseHandle(pi.hThread);
  1017. return (pid_t) pi.hProcess;
  1018. }
  1019. #endif // !NO_CGI
  1020. static int set_non_blocking_mode(SOCKET sock) {
  1021. unsigned long on = 1;
  1022. return ioctlsocket(sock, FIONBIO, &on);
  1023. }
  1024. #else
  1025. static int mg_stat(const char *path, struct mgstat *stp) {
  1026. struct stat st;
  1027. int ok;
  1028. if (stat(path, &st) == 0) {
  1029. ok = 0;
  1030. stp->size = st.st_size;
  1031. stp->mtime = st.st_mtime;
  1032. stp->is_directory = S_ISDIR(st.st_mode);
  1033. } else {
  1034. ok = -1;
  1035. }
  1036. return ok;
  1037. }
  1038. static void set_close_on_exec(int fd) {
  1039. (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
  1040. }
  1041. static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
  1042. void *param) {
  1043. pthread_t thread_id;
  1044. pthread_attr_t attr;
  1045. int retval;
  1046. (void) pthread_attr_init(&attr);
  1047. (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  1048. // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
  1049. // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
  1050. if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) {
  1051. cry(fc(ctx), "%s: %s", __func__, strerror(retval));
  1052. }
  1053. return retval;
  1054. }
  1055. #ifndef NO_CGI
  1056. static pid_t spawn_process(struct mg_connection *conn, const char *prog,
  1057. char *envblk, char *envp[], int fd_stdin,
  1058. int fd_stdout, const char *dir) {
  1059. pid_t pid;
  1060. const char *interp;
  1061. envblk = NULL; // Unused
  1062. if ((pid = fork()) == -1) {
  1063. // Parent
  1064. send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
  1065. } else if (pid == 0) {
  1066. // Child
  1067. if (chdir(dir) != 0) {
  1068. cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
  1069. } else if (dup2(fd_stdin, 0) == -1) {
  1070. cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
  1071. } else if (dup2(fd_stdout, 1) == -1) {
  1072. cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
  1073. } else {
  1074. (void) dup2(fd_stdout, 2);
  1075. (void) close(fd_stdin);
  1076. (void) close(fd_stdout);
  1077. // Execute CGI program. No need to lock: new process
  1078. interp = conn->ctx->config[CGI_INTERPRETER];
  1079. if (interp == NULL) {
  1080. (void) execle(prog, prog, NULL, envp);
  1081. cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
  1082. } else {
  1083. (void) execle(interp, interp, prog, NULL, envp);
  1084. cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
  1085. strerror(ERRNO));
  1086. }
  1087. }
  1088. exit(EXIT_FAILURE);
  1089. } else {
  1090. // Parent. Close stdio descriptors
  1091. (void) close(fd_stdin);
  1092. (void) close(fd_stdout);
  1093. }
  1094. return pid;
  1095. }
  1096. #endif // !NO_CGI
  1097. static int set_non_blocking_mode(SOCKET sock) {
  1098. int flags;
  1099. flags = fcntl(sock, F_GETFL, 0);
  1100. (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
  1101. return 0;
  1102. }
  1103. #endif // _WIN32
  1104. // Write data to the IO channel - opened file descriptor, socket or SSL
  1105. // descriptor. Return number of bytes written.
  1106. static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
  1107. int64_t len) {
  1108. int64_t sent;
  1109. int n, k;
  1110. sent = 0;
  1111. while (sent < len) {
  1112. // How many bytes we send in this iteration
  1113. k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
  1114. if (ssl != NULL) {
  1115. n = SSL_write(ssl, buf + sent, k);
  1116. } else if (fp != NULL) {
  1117. n = fwrite(buf + sent, 1, (size_t)k, fp);
  1118. if (ferror(fp))
  1119. n = -1;
  1120. } else {
  1121. n = send(sock, buf + sent, (size_t)k, 0);
  1122. }
  1123. if (n < 0)
  1124. break;
  1125. sent += n;
  1126. }
  1127. return sent;
  1128. }
  1129. // Read from IO channel - opened file descriptor, socket, or SSL descriptor.
  1130. // Return number of bytes read.
  1131. static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) {
  1132. int nread;
  1133. if (ssl != NULL) {
  1134. nread = SSL_read(ssl, buf, len);
  1135. } else if (fp != NULL) {
  1136. // Use read() instead of fread(), because if we're reading from the CGI
  1137. // pipe, fread() may block until IO buffer is filled up. We cannot afford
  1138. // to block and must pass all read bytes immediately to the client.
  1139. nread = read(fileno(fp), buf, (size_t) len);
  1140. if (ferror(fp))
  1141. nread = -1;
  1142. } else {
  1143. nread = recv(sock, buf, (size_t) len, 0);
  1144. }
  1145. return nread;
  1146. }
  1147. int mg_read(struct mg_connection *conn, void *buf, size_t len) {
  1148. int n, buffered_len, nread;
  1149. const char *buffered;
  1150. assert((conn->content_len == -1 && conn->consumed_content == 0) ||
  1151. conn->consumed_content <= conn->content_len);
  1152. DEBUG_TRACE(("%p %zu %lld %lld", buf, len,
  1153. conn->content_len, conn->consumed_content));
  1154. nread = 0;
  1155. if (conn->consumed_content < conn->content_len) {
  1156. // Adjust number of bytes to read.
  1157. int64_t to_read = conn->content_len - conn->consumed_content;
  1158. if (to_read < (int64_t) len) {
  1159. len = (int) to_read;
  1160. }
  1161. // How many bytes of data we have buffered in the request buffer?
  1162. buffered = conn->buf + conn->request_len + conn->consumed_content;
  1163. buffered_len = conn->data_len - conn->request_len;
  1164. assert(buffered_len >= 0);
  1165. // Return buffered data back if we haven't done that yet.
  1166. if (conn->consumed_content < (int64_t) buffered_len) {
  1167. buffered_len -= (int) conn->consumed_content;
  1168. if (len < (size_t) buffered_len) {
  1169. buffered_len = len;
  1170. }
  1171. memcpy(buf, buffered, (size_t)buffered_len);
  1172. len -= buffered_len;
  1173. buf = (char *) buf + buffered_len;
  1174. conn->consumed_content += buffered_len;
  1175. nread = buffered_len;
  1176. }
  1177. // We have returned all buffered data. Read new data from the remote socket.
  1178. while (len > 0) {
  1179. n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len);
  1180. if (n <= 0) {
  1181. break;
  1182. }
  1183. buf = (char *) buf + n;
  1184. conn->consumed_content += n;
  1185. nread += n;
  1186. len -= n;
  1187. }
  1188. }
  1189. return nread;
  1190. }
  1191. int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
  1192. return (int) push(NULL, conn->client.sock, conn->ssl,
  1193. (const char *) buf, (int64_t) len);
  1194. }
  1195. int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
  1196. char buf[BUFSIZ];
  1197. int len;
  1198. va_list ap;
  1199. va_start(ap, fmt);
  1200. len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
  1201. va_end(ap);
  1202. return mg_write(conn, buf, (size_t)len);
  1203. }
  1204. // URL-decode input buffer into destination buffer.
  1205. // 0-terminate the destination buffer. Return the length of decoded data.
  1206. // form-url-encoded data differs from URI encoding in a way that it
  1207. // uses '+' as character for space, see RFC 1866 section 8.2.1
  1208. // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
  1209. static size_t url_decode(const char *src, size_t src_len, char *dst,
  1210. size_t dst_len, int is_form_url_encoded) {
  1211. size_t i, j;
  1212. int a, b;
  1213. #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
  1214. for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
  1215. if (src[i] == '%' &&
  1216. isxdigit(* (const unsigned char *) (src + i + 1)) &&
  1217. isxdigit(* (const unsigned char *) (src + i + 2))) {
  1218. a = tolower(* (const unsigned char *) (src + i + 1));
  1219. b = tolower(* (const unsigned char *) (src + i + 2));
  1220. dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
  1221. i += 2;
  1222. } else if (is_form_url_encoded && src[i] == '+') {
  1223. dst[j] = ' ';
  1224. } else {
  1225. dst[j] = src[i];
  1226. }
  1227. }
  1228. dst[j] = '\0'; // Null-terminate the destination
  1229. return j;
  1230. }
  1231. // Scan given buffer and fetch the value of the given variable.
  1232. // It can be specified in query string, or in the POST data.
  1233. // Return NULL if the variable not found, or allocated 0-terminated value.
  1234. // It is caller's responsibility to free the returned value.
  1235. int mg_get_var(const char *buf, size_t buf_len, const char *name,
  1236. char *dst, size_t dst_len) {
  1237. const char *p, *e, *s;
  1238. size_t name_len, len;
  1239. name_len = strlen(name);
  1240. e = buf + buf_len;
  1241. len = -1;
  1242. dst[0] = '\0';
  1243. // buf is "var1=val1&var2=val2...". Find variable first
  1244. for (p = buf; p != NULL && p + name_len < e; p++) {
  1245. if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
  1246. !mg_strncasecmp(name, p, name_len)) {
  1247. // Point p to variable value
  1248. p += name_len + 1;
  1249. // Point s to the end of the value
  1250. s = (const char *) memchr(p, '&', (size_t)(e - p));
  1251. if (s == NULL) {
  1252. s = e;
  1253. }
  1254. assert(s >= p);
  1255. // Decode variable into destination buffer
  1256. if ((size_t) (s - p) < dst_len) {
  1257. len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
  1258. }
  1259. break;
  1260. }
  1261. }
  1262. return len;
  1263. }
  1264. int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
  1265. char *dst, size_t dst_size) {
  1266. const char *s, *p, *end;
  1267. int name_len, len = -1;
  1268. dst[0] = '\0';
  1269. if ((s = mg_get_header(conn, "Cookie")) == NULL) {
  1270. return 0;
  1271. }
  1272. name_len = strlen(cookie_name);
  1273. end = s + strlen(s);
  1274. for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
  1275. if (s[name_len] == '=') {
  1276. s += name_len + 1;
  1277. if ((p = strchr(s, ' ')) == NULL)
  1278. p = end;
  1279. if (p[-1] == ';')
  1280. p--;
  1281. if (*s == '"' && p[-1] == '"' && p > s + 1) {
  1282. s++;
  1283. p--;
  1284. }
  1285. if ((size_t) (p - s) < dst_size) {
  1286. len = (p - s) + 1;
  1287. mg_strlcpy(dst, s, (size_t)len);
  1288. }
  1289. break;
  1290. }
  1291. return len;
  1292. }
  1293. // Mongoose allows to specify multiple directories to serve,
  1294. // like /var/www,/~bob=/home/bob. That means that root directory depends on URI.
  1295. // This function returns root dir for given URI.
  1296. static int get_document_root(const struct mg_connection *conn,
  1297. struct vec *document_root) {
  1298. const char *root, *uri;
  1299. int len_of_matched_uri;
  1300. struct vec uri_vec, path_vec;
  1301. uri = conn->request_info.uri;
  1302. len_of_matched_uri = 0;
  1303. root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL);
  1304. while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) {
  1305. if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
  1306. *document_root = path_vec;
  1307. len_of_matched_uri = uri_vec.len;
  1308. break;
  1309. }
  1310. }
  1311. return len_of_matched_uri;
  1312. }
  1313. static void convert_uri_to_file_name(struct mg_connection *conn,
  1314. const char *uri, char *buf,
  1315. size_t buf_len) {
  1316. struct vec vec;
  1317. int match_len;
  1318. match_len = get_document_root(conn, &vec);
  1319. mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len);
  1320. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  1321. change_slashes_to_backslashes(buf);
  1322. #endif // _WIN32
  1323. DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr));
  1324. }
  1325. static int sslize(struct mg_connection *conn, int (*func)(SSL *)) {
  1326. return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL &&
  1327. SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
  1328. func(conn->ssl) == 1;
  1329. }
  1330. static struct mg_connection *mg_connect(struct mg_connection *conn,
  1331. const char *host, int port, int use_ssl) {
  1332. struct mg_connection *newconn = NULL;
  1333. struct sockaddr_in sin;
  1334. struct hostent *he;
  1335. int sock;
  1336. if (conn->ctx->ssl_ctx == NULL && use_ssl) {
  1337. cry(conn, "%s: SSL is not initialized", __func__);
  1338. } else if ((he = gethostbyname(host)) == NULL) {
  1339. cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
  1340. } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  1341. cry(conn, "%s: socket: %s", __func__, strerror(ERRNO));
  1342. } else {
  1343. sin.sin_family = AF_INET;
  1344. sin.sin_port = htons((uint16_t) port);
  1345. sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
  1346. if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
  1347. cry(conn, "%s: connect(%s:%d): %s", __func__, host, port,
  1348. strerror(ERRNO));
  1349. closesocket(sock);
  1350. } else if ((newconn = (struct mg_connection *)
  1351. calloc(1, sizeof(*newconn))) == NULL) {
  1352. cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO));
  1353. closesocket(sock);
  1354. } else {
  1355. newconn->client.sock = sock;
  1356. newconn->client.rsa.u.sin = sin;
  1357. if (use_ssl) {
  1358. sslize(newconn, SSL_connect);
  1359. }
  1360. }
  1361. }
  1362. return newconn;
  1363. }
  1364. // Check whether full request is buffered. Return:
  1365. // -1 if request is malformed
  1366. // 0 if request is not yet fully buffered
  1367. // >0 actual request length, including last \r\n\r\n
  1368. static int get_request_len(const char *buf, int buflen) {
  1369. const char *s, *e;
  1370. int len = 0;
  1371. DEBUG_TRACE(("buf: %p, len: %d", buf, buflen));
  1372. for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
  1373. // Control characters are not allowed but >=128 is.
  1374. if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
  1375. *s != '\n' && * (const unsigned char *) s < 128) {
  1376. len = -1;
  1377. } else if (s[0] == '\n' && s[1] == '\n') {
  1378. len = (int) (s - buf) + 2;
  1379. } else if (s[0] == '\n' && &s[1] < e &&
  1380. s[1] == '\r' && s[2] == '\n') {
  1381. len = (int) (s - buf) + 3;
  1382. }
  1383. return len;
  1384. }
  1385. // Convert month to the month number. Return -1 on error, or month number
  1386. static int get_month_index(const char *s) {
  1387. size_t i;
  1388. for (i = 0; i < ARRAY_SIZE(month_names); i++)
  1389. if (!strcmp(s, month_names[i]))
  1390. return (int) i;
  1391. return -1;
  1392. }
  1393. // Parse UTC date-time string, and return the corresponding time_t value.
  1394. static time_t parse_date_string(const char *datetime) {
  1395. static const unsigned short days_before_month[] = {
  1396. 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
  1397. };
  1398. char month_str[32];
  1399. int second, minute, hour, day, month, year, leap_days, days;
  1400. time_t result = (time_t) 0;
  1401. if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
  1402. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1403. (sscanf(datetime, "%d %3s %d %d:%d:%d",
  1404. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1405. (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
  1406. &day, month_str, &year, &hour, &minute, &second) == 6) ||
  1407. (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
  1408. &day, month_str, &year, &hour, &minute, &second) == 6)) &&
  1409. year > 1970 &&
  1410. (month = get_month_index(month_str)) != -1) {
  1411. year -= 1970;
  1412. leap_days = year / 4 - year / 100 + year / 400;
  1413. days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
  1414. result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
  1415. }
  1416. return result;
  1417. }
  1418. // Protect against directory disclosure attack by removing '..',
  1419. // excessive '/' and '\' characters
  1420. static void remove_double_dots_and_double_slashes(char *s) {
  1421. char *p = s;
  1422. while (*s != '\0') {
  1423. *p++ = *s++;
  1424. if (s[-1] == '/' || s[-1] == '\\') {
  1425. // Skip all following slashes and backslashes
  1426. while (*s == '/' || *s == '\\') {
  1427. s++;
  1428. }
  1429. // Skip all double-dots
  1430. while (*s == '.' && s[1] == '.') {
  1431. s += 2;
  1432. }
  1433. }
  1434. }
  1435. *p = '\0';
  1436. }
  1437. static const struct {
  1438. const char *extension;
  1439. size_t ext_len;
  1440. const char *mime_type;
  1441. size_t mime_type_len;
  1442. } builtin_mime_types[] = {
  1443. {".html", 5, "text/html", 9},
  1444. {".htm", 4, "text/html", 9},
  1445. {".shtm", 5, "text/html", 9},
  1446. {".shtml", 6, "text/html", 9},
  1447. {".css", 4, "text/css", 8},
  1448. {".js", 3, "application/x-javascript", 24},
  1449. {".ico", 4, "image/x-icon", 12},
  1450. {".gif", 4, "image/gif", 9},
  1451. {".jpg", 4, "image/jpeg", 10},
  1452. {".jpeg", 5, "image/jpeg", 10},
  1453. {".png", 4, "image/png", 9},
  1454. {".svg", 4, "image/svg+xml", 13},
  1455. {".torrent", 8, "application/x-bittorrent", 24},
  1456. {".wav", 4, "audio/x-wav", 11},
  1457. {".mp3", 4, "audio/x-mp3", 11},
  1458. {".mid", 4, "audio/mid", 9},
  1459. {".m3u", 4, "audio/x-mpegurl", 15},
  1460. {".ram", 4, "audio/x-pn-realaudio", 20},
  1461. {".xml", 4, "text/xml", 8},
  1462. {".xslt", 5, "application/xml", 15},
  1463. {".ra", 3, "audio/x-pn-realaudio", 20},
  1464. {".doc", 4, "application/msword", 19},
  1465. {".exe", 4, "application/octet-stream", 24},
  1466. {".zip", 4, "application/x-zip-compressed", 28},
  1467. {".xls", 4, "application/excel", 17},
  1468. {".tgz", 4, "application/x-tar-gz", 20},
  1469. {".tar", 4, "application/x-tar", 17},
  1470. {".gz", 3, "application/x-gunzip", 20},
  1471. {".arj", 4, "application/x-arj-compressed", 28},
  1472. {".rar", 4, "application/x-arj-compressed", 28},
  1473. {".rtf", 4, "application/rtf", 15},
  1474. {".pdf", 4, "application/pdf", 15},
  1475. {".swf", 4, "application/x-shockwave-flash",29},
  1476. {".mpg", 4, "video/mpeg", 10},
  1477. {".mpeg", 5, "video/mpeg", 10},
  1478. {".mp4", 4, "video/mp4", 9},
  1479. {".m4v", 4, "video/x-m4v", 11},
  1480. {".asf", 4, "video/x-ms-asf", 14},
  1481. {".avi", 4, "video/x-msvideo", 15},
  1482. {".bmp", 4, "image/bmp", 9},
  1483. {NULL, 0, NULL, 0}
  1484. };
  1485. // Look at the "path" extension and figure what mime type it has.
  1486. // Store mime type in the vector.
  1487. static void get_mime_type(struct mg_context *ctx, const char *path,
  1488. struct vec *vec) {
  1489. struct vec ext_vec, mime_vec;
  1490. const char *list, *ext;
  1491. size_t i, path_len;
  1492. path_len = strlen(path);
  1493. // Scan user-defined mime types first, in case user wants to
  1494. // override default mime types.
  1495. list = ctx->config[EXTRA_MIME_TYPES];
  1496. while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
  1497. // ext now points to the path suffix
  1498. ext = path + path_len - ext_vec.len;
  1499. if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
  1500. *vec = mime_vec;
  1501. return;
  1502. }
  1503. }
  1504. // Now scan built-in mime types
  1505. for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
  1506. ext = path + (path_len - builtin_mime_types[i].ext_len);
  1507. if (path_len > builtin_mime_types[i].ext_len &&
  1508. mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
  1509. vec->ptr = builtin_mime_types[i].mime_type;
  1510. vec->len = builtin_mime_types[i].mime_type_len;
  1511. return;
  1512. }
  1513. }
  1514. // Nothing found. Fall back to "text/plain"
  1515. vec->ptr = "text/plain";
  1516. vec->len = 10;
  1517. }
  1518. #ifndef HAVE_MD5
  1519. typedef struct MD5Context {
  1520. uint32_t buf[4];
  1521. uint32_t bits[2];
  1522. unsigned char in[64];
  1523. } MD5_CTX;
  1524. #if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
  1525. #define byteReverse(buf, len) // Do nothing
  1526. #else
  1527. static void byteReverse(unsigned char *buf, unsigned longs) {
  1528. uint32_t t;
  1529. do {
  1530. t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
  1531. ((unsigned) buf[1] << 8 | buf[0]);
  1532. *(uint32_t *) buf = t;
  1533. buf += 4;
  1534. } while (--longs);
  1535. }
  1536. #endif
  1537. #define F1(x, y, z) (z ^ (x & (y ^ z)))
  1538. #define F2(x, y, z) F1(z, x, y)
  1539. #define F3(x, y, z) (x ^ y ^ z)
  1540. #define F4(x, y, z) (y ^ (x | ~z))
  1541. #define MD5STEP(f, w, x, y, z, data, s) \
  1542. ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
  1543. // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
  1544. // initialization constants.
  1545. static void MD5Init(MD5_CTX *ctx) {
  1546. ctx->buf[0] = 0x67452301;
  1547. ctx->buf[1] = 0xefcdab89;
  1548. ctx->buf[2] = 0x98badcfe;
  1549. ctx->buf[3] = 0x10325476;
  1550. ctx->bits[0] = 0;
  1551. ctx->bits[1] = 0;
  1552. }
  1553. static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
  1554. register uint32_t a, b, c, d;
  1555. a = buf[0];
  1556. b = buf[1];
  1557. c = buf[2];
  1558. d = buf[3];
  1559. MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  1560. MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  1561. MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
  1562. MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  1563. MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  1564. MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  1565. MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
  1566. MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
  1567. MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
  1568. MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  1569. MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  1570. MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  1571. MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
  1572. MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
  1573. MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
  1574. MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
  1575. MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  1576. MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
  1577. MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  1578. MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  1579. MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  1580. MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
  1581. MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  1582. MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  1583. MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  1584. MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  1585. MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  1586. MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  1587. MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  1588. MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  1589. MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  1590. MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  1591. MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  1592. MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
  1593. MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  1594. MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  1595. MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  1596. MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  1597. MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  1598. MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  1599. MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  1600. MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  1601. MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  1602. MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
  1603. MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  1604. MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  1605. MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  1606. MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  1607. MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
  1608. MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
  1609. MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  1610. MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  1611. MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  1612. MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  1613. MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  1614. MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  1615. MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  1616. MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  1617. MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
  1618. MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  1619. MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  1620. MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  1621. MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  1622. MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  1623. buf[0] += a;
  1624. buf[1] += b;
  1625. buf[2] += c;
  1626. buf[3] += d;
  1627. }
  1628. static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
  1629. uint32_t t;
  1630. t = ctx->bits[0];
  1631. if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
  1632. ctx->bits[1]++;
  1633. ctx->bits[1] += len >> 29;
  1634. t = (t >> 3) & 0x3f;
  1635. if (t) {
  1636. unsigned char *p = (unsigned char *) ctx->in + t;
  1637. t = 64 - t;
  1638. if (len < t) {
  1639. memcpy(p, buf, len);
  1640. return;
  1641. }
  1642. memcpy(p, buf, t);
  1643. byteReverse(ctx->in, 16);
  1644. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1645. buf += t;
  1646. len -= t;
  1647. }
  1648. while (len >= 64) {
  1649. memcpy(ctx->in, buf, 64);
  1650. byteReverse(ctx->in, 16);
  1651. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1652. buf += 64;
  1653. len -= 64;
  1654. }
  1655. memcpy(ctx->in, buf, len);
  1656. }
  1657. static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
  1658. unsigned count;
  1659. unsigned char *p;
  1660. count = (ctx->bits[0] >> 3) & 0x3F;
  1661. p = ctx->in + count;
  1662. *p++ = 0x80;
  1663. count = 64 - 1 - count;
  1664. if (count < 8) {
  1665. memset(p, 0, count);
  1666. byteReverse(ctx->in, 16);
  1667. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1668. memset(ctx->in, 0, 56);
  1669. } else {
  1670. memset(p, 0, count - 8);
  1671. }
  1672. byteReverse(ctx->in, 14);
  1673. ((uint32_t *) ctx->in)[14] = ctx->bits[0];
  1674. ((uint32_t *) ctx->in)[15] = ctx->bits[1];
  1675. MD5Transform(ctx->buf, (uint32_t *) ctx->in);
  1676. byteReverse((unsigned char *) ctx->buf, 4);
  1677. memcpy(digest, ctx->buf, 16);
  1678. memset((char *) ctx, 0, sizeof(*ctx));
  1679. }
  1680. #endif // !HAVE_MD5
  1681. // Stringify binary data. Output buffer must be twice as big as input,
  1682. // because each byte takes 2 bytes in string representation
  1683. static void bin2str(char *to, const unsigned char *p, size_t len) {
  1684. static const char *hex = "0123456789abcdef";
  1685. for (; len--; p++) {
  1686. *to++ = hex[p[0] >> 4];
  1687. *to++ = hex[p[0] & 0x0f];
  1688. }
  1689. *to = '\0';
  1690. }
  1691. // Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes.
  1692. void mg_md5(char *buf, ...) {
  1693. unsigned char hash[16];
  1694. const char *p;
  1695. va_list ap;
  1696. MD5_CTX ctx;
  1697. MD5Init(&ctx);
  1698. va_start(ap, buf);
  1699. while ((p = va_arg(ap, const char *)) != NULL) {
  1700. MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
  1701. }
  1702. va_end(ap);
  1703. MD5Final(hash, &ctx);
  1704. bin2str(buf, hash, sizeof(hash));
  1705. }
  1706. // Check the user's password, return 1 if OK
  1707. static int check_password(const char *method, const char *ha1, const char *uri,
  1708. const char *nonce, const char *nc, const char *cnonce,
  1709. const char *qop, const char *response) {
  1710. char ha2[32 + 1], expected_response[32 + 1];
  1711. // Some of the parameters may be NULL
  1712. if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
  1713. qop == NULL || response == NULL) {
  1714. return 0;
  1715. }
  1716. // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
  1717. // TODO(lsm): check for authentication timeout
  1718. if (// strcmp(dig->uri, c->ouri) != 0 ||
  1719. strlen(response) != 32
  1720. // || now - strtoul(dig->nonce, NULL, 10) > 3600
  1721. ) {
  1722. return 0;
  1723. }
  1724. mg_md5(ha2, method, ":", uri, NULL);
  1725. mg_md5(expected_response, ha1, ":", nonce, ":", nc,
  1726. ":", cnonce, ":", qop, ":", ha2, NULL);
  1727. return mg_strcasecmp(response, expected_response) == 0;
  1728. }
  1729. // Use the global passwords file, if specified by auth_gpass option,
  1730. // or search for .htpasswd in the requested directory.
  1731. static FILE *open_auth_file(struct mg_connection *conn, const char *path) {
  1732. struct mg_context *ctx = conn->ctx;
  1733. char name[PATH_MAX];
  1734. const char *p, *e;
  1735. struct mgstat st;
  1736. FILE *fp;
  1737. if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) {
  1738. // Use global passwords file
  1739. fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r");
  1740. if (fp == NULL)
  1741. cry(fc(ctx), "fopen(%s): %s",
  1742. ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO));
  1743. } else if (!mg_stat(path, &st) && st.is_directory) {
  1744. (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
  1745. path, DIRSEP, PASSWORDS_FILE_NAME);
  1746. fp = mg_fopen(name, "r");
  1747. } else {
  1748. // Try to find .htpasswd in requested directory.
  1749. for (p = path, e = p + strlen(p) - 1; e > p; e--)
  1750. if (IS_DIRSEP_CHAR(*e))
  1751. break;
  1752. (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
  1753. (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
  1754. fp = mg_fopen(name, "r");
  1755. }
  1756. return fp;
  1757. }
  1758. // Parsed Authorization header
  1759. struct ah {
  1760. char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
  1761. };
  1762. static int parse_auth_header(struct mg_connection *conn, char *buf,
  1763. size_t buf_size, struct ah *ah) {
  1764. char *name, *value, *s;
  1765. const char *auth_header;
  1766. if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
  1767. mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
  1768. return 0;
  1769. }
  1770. // Make modifiable copy of the auth header
  1771. (void) mg_strlcpy(buf, auth_header + 7, buf_size);
  1772. s = buf;
  1773. (void) memset(ah, 0, sizeof(*ah));
  1774. // Parse authorization header
  1775. for (;;) {
  1776. // Gobble initial spaces
  1777. while (isspace(* (unsigned char *) s)) {
  1778. s++;
  1779. }
  1780. name = skip_quoted(&s, "=", " ", 0);
  1781. // Value is either quote-delimited, or ends at first comma or space.
  1782. if (s[0] == '\"') {
  1783. s++;
  1784. value = skip_quoted(&s, "\"", " ", '\\');
  1785. if (s[0] == ',') {
  1786. s++;
  1787. }
  1788. } else {
  1789. value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
  1790. }
  1791. if (*name == '\0') {
  1792. break;
  1793. }
  1794. if (!strcmp(name, "username")) {
  1795. ah->user = value;
  1796. } else if (!strcmp(name, "cnonce")) {
  1797. ah->cnonce = value;
  1798. } else if (!strcmp(name, "response")) {
  1799. ah->response = value;
  1800. } else if (!strcmp(name, "uri")) {
  1801. ah->uri = value;
  1802. } else if (!strcmp(name, "qop")) {
  1803. ah->qop = value;
  1804. } else if (!strcmp(name, "nc")) {
  1805. ah->nc = value;
  1806. } else if (!strcmp(name, "nonce")) {
  1807. ah->nonce = value;
  1808. }
  1809. }
  1810. // CGI needs it as REMOTE_USER
  1811. if (ah->user != NULL) {
  1812. conn->request_info.remote_user = mg_strdup(ah->user);
  1813. } else {
  1814. return 0;
  1815. }
  1816. return 1;
  1817. }
  1818. // Authorize against the opened passwords file. Return 1 if authorized.
  1819. static int authorize(struct mg_connection *conn, FILE *fp) {
  1820. struct ah ah;
  1821. char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ];
  1822. if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
  1823. return 0;
  1824. }
  1825. // Loop over passwords file
  1826. while (fgets(line, sizeof(line), fp) != NULL) {
  1827. if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
  1828. continue;
  1829. }
  1830. if (!strcmp(ah.user, f_user) &&
  1831. !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
  1832. return check_password(
  1833. conn->request_info.request_method,
  1834. ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
  1835. ah.response);
  1836. }
  1837. return 0;
  1838. }
  1839. // Return 1 if request is authorised, 0 otherwise.
  1840. static int check_authorization(struct mg_connection *conn, const char *path) {
  1841. FILE *fp;
  1842. char fname[PATH_MAX];
  1843. struct vec uri_vec, filename_vec;
  1844. const char *list;
  1845. int authorized;
  1846. fp = NULL;
  1847. authorized = 1;
  1848. list = conn->ctx->config[PROTECT_URI];
  1849. while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
  1850. if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
  1851. (void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
  1852. filename_vec.len, filename_vec.ptr);
  1853. if ((fp = mg_fopen(fname, "r")) == NULL) {
  1854. cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
  1855. }
  1856. break;
  1857. }
  1858. }
  1859. if (fp == NULL) {
  1860. fp = open_auth_file(conn, path);
  1861. }
  1862. if (fp != NULL) {
  1863. authorized = authorize(conn, fp);
  1864. (void) fclose(fp);
  1865. }
  1866. return authorized;
  1867. }
  1868. static void send_authorization_request(struct mg_connection *conn) {
  1869. conn->request_info.status_code = 401;
  1870. (void) mg_printf(conn,
  1871. "HTTP/1.1 401 Unauthorized\r\n"
  1872. "Content-Length: 0\r\n"
  1873. "WWW-Authenticate: Digest qop=\"auth\", "
  1874. "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
  1875. conn->ctx->config[AUTHENTICATION_DOMAIN],
  1876. (unsigned long) time(NULL));
  1877. }
  1878. static int is_authorized_for_put(struct mg_connection *conn) {
  1879. FILE *fp;
  1880. int ret = 0;
  1881. fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL :
  1882. mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r");
  1883. if (fp != NULL) {
  1884. ret = authorize(conn, fp);
  1885. (void) fclose(fp);
  1886. }
  1887. return ret;
  1888. }
  1889. int mg_modify_passwords_file(const char *fname, const char *domain,
  1890. const char *user, const char *pass) {
  1891. int found;
  1892. char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
  1893. FILE *fp, *fp2;
  1894. found = 0;
  1895. fp = fp2 = NULL;
  1896. // Regard empty password as no password - remove user record.
  1897. if (pass != NULL && pass[0] == '\0') {
  1898. pass = NULL;
  1899. }
  1900. (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
  1901. // Create the file if does not exist
  1902. if ((fp = mg_fopen(fname, "a+")) != NULL) {
  1903. (void) fclose(fp);
  1904. }
  1905. // Open the given file and temporary file
  1906. if ((fp = mg_fopen(fname, "r")) == NULL) {
  1907. return 0;
  1908. } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
  1909. fclose(fp);
  1910. return 0;
  1911. }
  1912. // Copy the stuff to temporary file
  1913. while (fgets(line, sizeof(line), fp) != NULL) {
  1914. if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
  1915. continue;
  1916. }
  1917. if (!strcmp(u, user) && !strcmp(d, domain)) {
  1918. found++;
  1919. if (pass != NULL) {
  1920. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  1921. fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  1922. }
  1923. } else {
  1924. (void) fprintf(fp2, "%s", line);
  1925. }
  1926. }
  1927. // If new user, just add it
  1928. if (!found && pass != NULL) {
  1929. mg_md5(ha1, user, ":", domain, ":", pass, NULL);
  1930. (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
  1931. }
  1932. // Close files
  1933. (void) fclose(fp);
  1934. (void) fclose(fp2);
  1935. // Put the temp file in place of real file
  1936. (void) mg_remove(fname);
  1937. (void) mg_rename(tmp, fname);
  1938. return 1;
  1939. }
  1940. struct de {
  1941. struct mg_connection *conn;
  1942. char *file_name;
  1943. struct mgstat st;
  1944. };
  1945. static void url_encode(const char *src, char *dst, size_t dst_len) {
  1946. static const char *dont_escape = "._-$,;~()";
  1947. static const char *hex = "0123456789abcdef";
  1948. const char *end = dst + dst_len - 1;
  1949. for (; *src != '\0' && dst < end; src++, dst++) {
  1950. if (isalnum(*(const unsigned char *) src) ||
  1951. strchr(dont_escape, * (const unsigned char *) src) != NULL) {
  1952. *dst = *src;
  1953. } else if (dst + 2 < end) {
  1954. dst[0] = '%';
  1955. dst[1] = hex[(* (const unsigned char *) src) >> 4];
  1956. dst[2] = hex[(* (const unsigned char *) src) & 0xf];
  1957. dst += 2;
  1958. }
  1959. }
  1960. *dst = '\0';
  1961. }
  1962. static void print_dir_entry(struct de *de) {
  1963. char size[64], mod[64], href[PATH_MAX];
  1964. if (de->st.is_directory) {
  1965. (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
  1966. } else {
  1967. // We use (signed) cast below because MSVC 6 compiler cannot
  1968. // convert unsigned __int64 to double. Sigh.
  1969. if (de->st.size < 1024) {
  1970. (void) mg_snprintf(de->conn, size, sizeof(size),
  1971. "%lu", (unsigned long) de->st.size);
  1972. } else if (de->st.size < 1024 * 1024) {
  1973. (void) mg_snprintf(de->conn, size, sizeof(size),
  1974. "%.1fk", (double) de->st.size / 1024.0);
  1975. } else if (de->st.size < 1024 * 1024 * 1024) {
  1976. (void) mg_snprintf(de->conn, size, sizeof(size),
  1977. "%.1fM", (double) de->st.size / 1048576);
  1978. } else {
  1979. (void) mg_snprintf(de->conn, size, sizeof(size),
  1980. "%.1fG", (double) de->st.size / 1073741824);
  1981. }
  1982. }
  1983. (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime));
  1984. url_encode(de->file_name, href, sizeof(href));
  1985. de->conn->num_bytes_sent += mg_printf(de->conn,
  1986. "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
  1987. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  1988. de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
  1989. de->file_name, de->st.is_directory ? "/" : "", mod, size);
  1990. }
  1991. // This function is called from send_directory() and used for
  1992. // sorting directory entries by size, or name, or modification time.
  1993. // On windows, __cdecl specification is needed in case if project is built
  1994. // with __stdcall convention. qsort always requires __cdels callback.
  1995. static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
  1996. const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
  1997. const char *query_string = a->conn->request_info.query_string;
  1998. int cmp_result = 0;
  1999. if (query_string == NULL) {
  2000. query_string = "na";
  2001. }
  2002. if (a->st.is_directory && !b->st.is_directory) {
  2003. return -1; // Always put directories on top
  2004. } else if (!a->st.is_directory && b->st.is_directory) {
  2005. return 1; // Always put directories on top
  2006. } else if (*query_string == 'n') {
  2007. cmp_result = strcmp(a->file_name, b->file_name);
  2008. } else if (*query_string == 's') {
  2009. cmp_result = a->st.size == b->st.size ? 0 :
  2010. a->st.size > b->st.size ? 1 : -1;
  2011. } else if (*query_string == 'd') {
  2012. cmp_result = a->st.mtime == b->st.mtime ? 0 :
  2013. a->st.mtime > b->st.mtime ? 1 : -1;
  2014. }
  2015. return query_string[1] == 'd' ? -cmp_result : cmp_result;
  2016. }
  2017. static int scan_directory(struct mg_connection *conn, const char *dir,
  2018. void *data, void (*cb)(struct de *, void *)) {
  2019. char path[PATH_MAX];
  2020. struct dirent *dp;
  2021. DIR *dirp;
  2022. struct de de;
  2023. if ((dirp = opendir(dir)) == NULL) {
  2024. return 0;
  2025. } else {
  2026. de.conn = conn;
  2027. while ((dp = readdir(dirp)) != NULL) {
  2028. // Do not show current dir and passwords file
  2029. if (!strcmp(dp->d_name, ".") ||
  2030. !strcmp(dp->d_name, "..") ||
  2031. !strcmp(dp->d_name, PASSWORDS_FILE_NAME))
  2032. continue;
  2033. mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name);
  2034. // If we don't memset stat structure to zero, mtime will have
  2035. // garbage and strftime() will segfault later on in
  2036. // print_dir_entry(). memset is required only if mg_stat()
  2037. // fails. For more details, see
  2038. // http://code.google.com/p/mongoose/issues/detail?id=79
  2039. if (mg_stat(path, &de.st) != 0) {
  2040. memset(&de.st, 0, sizeof(de.st));
  2041. }
  2042. de.file_name = dp->d_name;
  2043. cb(&de, data);
  2044. }
  2045. (void) closedir(dirp);
  2046. }
  2047. return 1;
  2048. }
  2049. struct dir_scan_data {
  2050. struct de *entries;
  2051. int num_entries;
  2052. int arr_size;
  2053. };
  2054. static void dir_scan_callback(struct de *de, void *data) {
  2055. struct dir_scan_data *dsd = (struct dir_scan_data *) data;
  2056. if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
  2057. dsd->arr_size *= 2;
  2058. dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
  2059. sizeof(dsd->entries[0]));
  2060. }
  2061. if (dsd->entries == NULL) {
  2062. // TODO(lsm): propagate an error to the caller
  2063. dsd->num_entries = 0;
  2064. } else {
  2065. dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
  2066. dsd->entries[dsd->num_entries].st = de->st;
  2067. dsd->entries[dsd->num_entries].conn = de->conn;
  2068. dsd->num_entries++;
  2069. }
  2070. }
  2071. static void handle_directory_request(struct mg_connection *conn,
  2072. const char *dir) {
  2073. int i, sort_direction;
  2074. struct dir_scan_data data = { NULL, 0, 128 };
  2075. if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
  2076. send_http_error(conn, 500, "Cannot open directory",
  2077. "Error: opendir(%s): %s", dir, strerror(ERRNO));
  2078. return;
  2079. }
  2080. sort_direction = conn->request_info.query_string != NULL &&
  2081. conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
  2082. mg_printf(conn, "%s",
  2083. "HTTP/1.1 200 OK\r\n"
  2084. "Connection: close\r\n"
  2085. "Content-Type: text/html; charset=utf-8\r\n\r\n");
  2086. conn->num_bytes_sent += mg_printf(conn,
  2087. "<html><head><title>Index of %s</title>"
  2088. "<style>th {text-align: left;}</style></head>"
  2089. "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
  2090. "<tr><th><a href=\"?n%c\">Name</a></th>"
  2091. "<th><a href=\"?d%c\">Modified</a></th>"
  2092. "<th><a href=\"?s%c\">Size</a></th></tr>"
  2093. "<tr><td colspan=\"3\"><hr></td></tr>",
  2094. conn->request_info.uri, conn->request_info.uri,
  2095. sort_direction, sort_direction, sort_direction);
  2096. // Print first entry - link to a parent directory
  2097. conn->num_bytes_sent += mg_printf(conn,
  2098. "<tr><td><a href=\"%s%s\">%s</a></td>"
  2099. "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
  2100. conn->request_info.uri, "..", "Parent directory", "-", "-");
  2101. // Sort and print directory entries
  2102. qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
  2103. compare_dir_entries);
  2104. for (i = 0; i < data.num_entries; i++) {
  2105. print_dir_entry(&data.entries[i]);
  2106. free(data.entries[i].file_name);
  2107. }
  2108. free(data.entries);
  2109. conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
  2110. conn->request_info.status_code = 200;
  2111. }
  2112. // Send len bytes from the opened file to the client.
  2113. static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
  2114. char buf[BUFSIZ];
  2115. int to_read, num_read, num_written;
  2116. while (len > 0) {
  2117. // Calculate how much to read from the file in the buffer
  2118. to_read = sizeof(buf);
  2119. if ((int64_t) to_read > len)
  2120. to_read = (int) len;
  2121. // Read from file, exit the loop on error
  2122. if ((num_read = fread(buf, 1, (size_t)to_read, fp)) == 0)
  2123. break;
  2124. // Send read bytes to the client, exit the loop on error
  2125. if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read)
  2126. break;
  2127. // Both read and were successful, adjust counters
  2128. conn->num_bytes_sent += num_written;
  2129. len -= num_written;
  2130. }
  2131. }
  2132. static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
  2133. return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
  2134. }
  2135. static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
  2136. strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
  2137. }
  2138. static void handle_file_request(struct mg_connection *conn, const char *path,
  2139. struct mgstat *stp) {
  2140. char date[64], lm[64], etag[64], range[64];
  2141. const char *msg = "OK", *hdr;
  2142. time_t curtime = time(NULL);
  2143. int64_t cl, r1, r2;
  2144. struct vec mime_vec;
  2145. FILE *fp;
  2146. int n;
  2147. get_mime_type(conn->ctx, path, &mime_vec);
  2148. cl = stp->size;
  2149. conn->request_info.status_code = 200;
  2150. range[0] = '\0';
  2151. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2152. send_http_error(conn, 500, http_500_error,
  2153. "fopen(%s): %s", path, strerror(ERRNO));
  2154. return;
  2155. }
  2156. set_close_on_exec(fileno(fp));
  2157. // If Range: header specified, act accordingly
  2158. r1 = r2 = 0;
  2159. hdr = mg_get_header(conn, "Range");
  2160. if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
  2161. conn->request_info.status_code = 206;
  2162. (void) fseeko(fp, (off_t) r1, SEEK_SET);
  2163. cl = n == 2 ? r2 - r1 + 1: cl - r1;
  2164. (void) mg_snprintf(conn, range, sizeof(range),
  2165. "Content-Range: bytes "
  2166. "%" INT64_FMT "-%"
  2167. INT64_FMT "/%" INT64_FMT "\r\n",
  2168. r1, r1 + cl - 1, stp->size);
  2169. msg = "Partial Content";
  2170. }
  2171. // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
  2172. // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
  2173. gmt_time_string(date, sizeof(date), &curtime);
  2174. gmt_time_string(lm, sizeof(lm), &stp->mtime);
  2175. (void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
  2176. (unsigned long) stp->mtime, (unsigned long) stp->size);
  2177. (void) mg_printf(conn,
  2178. "HTTP/1.1 %d %s\r\n"
  2179. "Date: %s\r\n"
  2180. "Last-Modified: %s\r\n"
  2181. "Etag: \"%s\"\r\n"
  2182. "Content-Type: %.*s\r\n"
  2183. "Content-Length: %" INT64_FMT "\r\n"
  2184. "Connection: %s\r\n"
  2185. "Accept-Ranges: bytes\r\n"
  2186. "%s\r\n",
  2187. conn->request_info.status_code, msg, date, lm, etag,
  2188. mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range);
  2189. if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
  2190. send_file_data(conn, fp, cl);
  2191. }
  2192. (void) fclose(fp);
  2193. }
  2194. void mg_send_file(struct mg_connection *conn, const char *path) {
  2195. struct mgstat st;
  2196. if (mg_stat(path, &st) == 0) {
  2197. handle_file_request(conn, path, &st);
  2198. } else {
  2199. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2200. }
  2201. }
  2202. // Parse HTTP headers from the given buffer, advance buffer to the point
  2203. // where parsing stopped.
  2204. static void parse_http_headers(char **buf, struct mg_request_info *ri) {
  2205. int i;
  2206. for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
  2207. ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
  2208. ri->http_headers[i].value = skip(buf, "\r\n");
  2209. if (ri->http_headers[i].name[0] == '\0')
  2210. break;
  2211. ri->num_headers = i + 1;
  2212. }
  2213. }
  2214. static int is_valid_http_method(const char *method) {
  2215. return !strcmp(method, "GET") || !strcmp(method, "POST") ||
  2216. !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
  2217. !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
  2218. !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
  2219. }
  2220. // Parse HTTP request, fill in mg_request_info structure.
  2221. static int parse_http_request(char *buf, struct mg_request_info *ri) {
  2222. int status = 0;
  2223. // RFC says that all initial whitespaces should be ingored
  2224. while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
  2225. buf++;
  2226. }
  2227. ri->request_method = skip(&buf, " ");
  2228. ri->uri = skip(&buf, " ");
  2229. ri->http_version = skip(&buf, "\r\n");
  2230. if (is_valid_http_method(ri->request_method) &&
  2231. strncmp(ri->http_version, "HTTP/", 5) == 0) {
  2232. ri->http_version += 5; // Skip "HTTP/"
  2233. parse_http_headers(&buf, ri);
  2234. status = 1;
  2235. }
  2236. return status;
  2237. }
  2238. // Keep reading the input (either opened file descriptor fd, or socket sock,
  2239. // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
  2240. // buffer (which marks the end of HTTP request). Buffer buf may already
  2241. // have some data. The length of the data is stored in nread.
  2242. // Upon every read operation, increase nread by the number of bytes read.
  2243. static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz,
  2244. int *nread) {
  2245. int n, request_len;
  2246. request_len = 0;
  2247. while (*nread < bufsiz && request_len == 0) {
  2248. n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
  2249. if (n <= 0) {
  2250. break;
  2251. } else {
  2252. *nread += n;
  2253. request_len = get_request_len(buf, *nread);
  2254. }
  2255. }
  2256. return request_len;
  2257. }
  2258. // For given directory path, substitute it to valid index file.
  2259. // Return 0 if index file has been found, -1 if not found.
  2260. // If the file is found, it's stats is returned in stp.
  2261. static int substitute_index_file(struct mg_connection *conn, char *path,
  2262. size_t path_len, struct mgstat *stp) {
  2263. const char *list = conn->ctx->config[INDEX_FILES];
  2264. struct mgstat st;
  2265. struct vec filename_vec;
  2266. size_t n = strlen(path);
  2267. int found = 0;
  2268. // The 'path' given to us points to the directory. Remove all trailing
  2269. // directory separator characters from the end of the path, and
  2270. // then append single directory separator character.
  2271. while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) {
  2272. n--;
  2273. }
  2274. path[n] = DIRSEP;
  2275. // Traverse index files list. For each entry, append it to the given
  2276. // path and see if the file exists. If it exists, break the loop
  2277. while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
  2278. // Ignore too long entries that may overflow path buffer
  2279. if (filename_vec.len > path_len - n)
  2280. continue;
  2281. // Prepare full path to the index file
  2282. (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
  2283. // Does it exist?
  2284. if (mg_stat(path, &st) == 0) {
  2285. // Yes it does, break the loop
  2286. *stp = st;
  2287. found = 1;
  2288. break;
  2289. }
  2290. }
  2291. // If no index file exists, restore directory path
  2292. if (!found) {
  2293. path[n] = '\0';
  2294. }
  2295. return found;
  2296. }
  2297. // Return True if we should reply 304 Not Modified.
  2298. static int is_not_modified(const struct mg_connection *conn,
  2299. const struct mgstat *stp) {
  2300. const char *ims = mg_get_header(conn, "If-Modified-Since");
  2301. return ims != NULL && stp->mtime <= parse_date_string(ims);
  2302. }
  2303. static int forward_body_data(struct mg_connection *conn, FILE *fp,
  2304. SOCKET sock, SSL *ssl) {
  2305. const char *expect, *buffered;
  2306. char buf[BUFSIZ];
  2307. int to_read, nread, buffered_len, success = 0;
  2308. expect = mg_get_header(conn, "Expect");
  2309. assert(fp != NULL);
  2310. if (conn->content_len == -1) {
  2311. send_http_error(conn, 411, "Length Required", "");
  2312. } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
  2313. send_http_error(conn, 417, "Expectation Failed", "");
  2314. } else {
  2315. if (expect != NULL) {
  2316. (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
  2317. }
  2318. buffered = conn->buf + conn->request_len;
  2319. buffered_len = conn->data_len - conn->request_len;
  2320. assert(buffered_len >= 0);
  2321. assert(conn->consumed_content == 0);
  2322. if (buffered_len > 0) {
  2323. if ((int64_t) buffered_len > conn->content_len) {
  2324. buffered_len = (int) conn->content_len;
  2325. }
  2326. push(fp, sock, ssl, buffered, (int64_t) buffered_len);
  2327. conn->consumed_content += buffered_len;
  2328. }
  2329. while (conn->consumed_content < conn->content_len) {
  2330. to_read = sizeof(buf);
  2331. if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
  2332. to_read = (int) (conn->content_len - conn->consumed_content);
  2333. }
  2334. nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
  2335. if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
  2336. break;
  2337. }
  2338. conn->consumed_content += nread;
  2339. }
  2340. if (conn->consumed_content == conn->content_len) {
  2341. success = 1;
  2342. }
  2343. // Each error code path in this function must send an error
  2344. if (!success) {
  2345. send_http_error(conn, 577, http_500_error, "");
  2346. }
  2347. }
  2348. return success;
  2349. }
  2350. #if !defined(NO_CGI)
  2351. // This structure helps to create an environment for the spawned CGI program.
  2352. // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
  2353. // last element must be NULL.
  2354. // However, on Windows there is a requirement that all these VARIABLE=VALUE\0
  2355. // strings must reside in a contiguous buffer. The end of the buffer is
  2356. // marked by two '\0' characters.
  2357. // We satisfy both worlds: we create an envp array (which is vars), all
  2358. // entries are actually pointers inside buf.
  2359. struct cgi_env_block {
  2360. struct mg_connection *conn;
  2361. char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
  2362. int len; // Space taken
  2363. char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
  2364. int nvars; // Number of variables
  2365. };
  2366. // Append VARIABLE=VALUE\0 string to the buffer, and add a respective
  2367. // pointer into the vars array.
  2368. static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
  2369. int n, space;
  2370. char *added;
  2371. va_list ap;
  2372. // Calculate how much space is left in the buffer
  2373. space = sizeof(block->buf) - block->len - 2;
  2374. assert(space >= 0);
  2375. // Make a pointer to the free space int the buffer
  2376. added = block->buf + block->len;
  2377. // Copy VARIABLE=VALUE\0 string into the free space
  2378. va_start(ap, fmt);
  2379. n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
  2380. va_end(ap);
  2381. // Make sure we do not overflow buffer and the envp array
  2382. if (n > 0 && n < space &&
  2383. block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
  2384. // Append a pointer to the added string into the envp array
  2385. block->vars[block->nvars++] = block->buf + block->len;
  2386. // Bump up used length counter. Include \0 terminator
  2387. block->len += n + 1;
  2388. }
  2389. return added;
  2390. }
  2391. static void prepare_cgi_environment(struct mg_connection *conn,
  2392. const char *prog,
  2393. struct cgi_env_block *blk) {
  2394. const char *s, *slash;
  2395. struct vec var_vec, root;
  2396. char *p;
  2397. int i;
  2398. blk->len = blk->nvars = 0;
  2399. blk->conn = conn;
  2400. get_document_root(conn, &root);
  2401. addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
  2402. addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr);
  2403. addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr);
  2404. // Prepare the environment block
  2405. addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
  2406. addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
  2407. addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
  2408. addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port));
  2409. addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method);
  2410. addenv(blk, "REMOTE_ADDR=%s",
  2411. inet_ntoa(conn->client.rsa.u.sin.sin_addr));
  2412. addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port);
  2413. addenv(blk, "REQUEST_URI=%s", conn->request_info.uri);
  2414. // SCRIPT_NAME
  2415. assert(conn->request_info.uri[0] == '/');
  2416. slash = strrchr(conn->request_info.uri, '/');
  2417. if ((s = strrchr(prog, '/')) == NULL)
  2418. s = prog;
  2419. addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri,
  2420. conn->request_info.uri, s);
  2421. addenv(blk, "SCRIPT_FILENAME=%s", prog);
  2422. addenv(blk, "PATH_TRANSLATED=%s", prog);
  2423. addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
  2424. if ((s = mg_get_header(conn, "Content-Type")) != NULL)
  2425. addenv(blk, "CONTENT_TYPE=%s", s);
  2426. if (conn->request_info.query_string != NULL)
  2427. addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string);
  2428. if ((s = mg_get_header(conn, "Content-Length")) != NULL)
  2429. addenv(blk, "CONTENT_LENGTH=%s", s);
  2430. if ((s = getenv("PATH")) != NULL)
  2431. addenv(blk, "PATH=%s", s);
  2432. #if defined(_WIN32)
  2433. if ((s = getenv("COMSPEC")) != NULL)
  2434. addenv(blk, "COMSPEC=%s", s);
  2435. if ((s = getenv("SYSTEMROOT")) != NULL)
  2436. addenv(blk, "SYSTEMROOT=%s", s);
  2437. #else
  2438. if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
  2439. addenv(blk, "LD_LIBRARY_PATH=%s", s);
  2440. #endif // _WIN32
  2441. if ((s = getenv("PERLLIB")) != NULL)
  2442. addenv(blk, "PERLLIB=%s", s);
  2443. if (conn->request_info.remote_user != NULL) {
  2444. addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user);
  2445. addenv(blk, "%s", "AUTH_TYPE=Digest");
  2446. }
  2447. // Add all headers as HTTP_* variables
  2448. for (i = 0; i < conn->request_info.num_headers; i++) {
  2449. p = addenv(blk, "HTTP_%s=%s",
  2450. conn->request_info.http_headers[i].name,
  2451. conn->request_info.http_headers[i].value);
  2452. // Convert variable name into uppercase, and change - to _
  2453. for (; *p != '=' && *p != '\0'; p++) {
  2454. if (*p == '-')
  2455. *p = '_';
  2456. *p = (char) toupper(* (unsigned char *) p);
  2457. }
  2458. }
  2459. // Add user-specified variables
  2460. s = conn->ctx->config[CGI_ENVIRONMENT];
  2461. while ((s = next_option(s, &var_vec, NULL)) != NULL) {
  2462. addenv(blk, "%.*s", var_vec.len, var_vec.ptr);
  2463. }
  2464. blk->vars[blk->nvars++] = NULL;
  2465. blk->buf[blk->len++] = '\0';
  2466. assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
  2467. assert(blk->len > 0);
  2468. assert(blk->len < (int) sizeof(blk->buf));
  2469. }
  2470. static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
  2471. int headers_len, data_len, i, fd_stdin[2], fd_stdout[2];
  2472. const char *status;
  2473. char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p;
  2474. struct mg_request_info ri;
  2475. struct cgi_env_block blk;
  2476. FILE *in, *out;
  2477. pid_t pid;
  2478. prepare_cgi_environment(conn, prog, &blk);
  2479. // CGI must be executed in its own directory. 'dir' must point to the
  2480. // directory containing executable program, 'p' must point to the
  2481. // executable program name relative to 'dir'.
  2482. (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
  2483. if ((p = strrchr(dir, DIRSEP)) != NULL) {
  2484. *p++ = '\0';
  2485. } else {
  2486. dir[0] = '.', dir[1] = '\0';
  2487. p = (char *) prog;
  2488. }
  2489. pid = (pid_t) -1;
  2490. fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1;
  2491. in = out = NULL;
  2492. if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) {
  2493. send_http_error(conn, 500, http_500_error,
  2494. "Cannot create CGI pipe: %s", strerror(ERRNO));
  2495. goto done;
  2496. } else if ((pid = spawn_process(conn, p, blk.buf, blk.vars,
  2497. fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) {
  2498. goto done;
  2499. } else if ((in = fdopen(fd_stdin[1], "wb")) == NULL ||
  2500. (out = fdopen(fd_stdout[0], "rb")) == NULL) {
  2501. send_http_error(conn, 500, http_500_error,
  2502. "fopen: %s", strerror(ERRNO));
  2503. goto done;
  2504. }
  2505. setbuf(in, NULL);
  2506. setbuf(out, NULL);
  2507. // spawn_process() must close those!
  2508. // If we don't mark them as closed, close() attempt before
  2509. // return from this function throws an exception on Windows.
  2510. // Windows does not like when closed descriptor is closed again.
  2511. fd_stdin[0] = fd_stdout[1] = -1;
  2512. // Send POST data to the CGI process if needed
  2513. if (!strcmp(conn->request_info.request_method, "POST") &&
  2514. !forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
  2515. goto done;
  2516. }
  2517. // Now read CGI reply into a buffer. We need to set correct
  2518. // status code, thus we need to see all HTTP headers first.
  2519. // Do not send anything back to client, until we buffer in all
  2520. // HTTP headers.
  2521. data_len = 0;
  2522. headers_len = read_request(out, INVALID_SOCKET, NULL,
  2523. buf, sizeof(buf), &data_len);
  2524. if (headers_len <= 0) {
  2525. send_http_error(conn, 500, http_500_error,
  2526. "CGI program sent malformed HTTP headers: [%.*s]",
  2527. data_len, buf);
  2528. goto done;
  2529. }
  2530. pbuf = buf;
  2531. buf[headers_len - 1] = '\0';
  2532. parse_http_headers(&pbuf, &ri);
  2533. // Make up and send the status line
  2534. status = get_header(&ri, "Status");
  2535. conn->request_info.status_code = status == NULL ? 200 : atoi(status);
  2536. (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n", conn->request_info.status_code);
  2537. // Send headers
  2538. for (i = 0; i < ri.num_headers; i++) {
  2539. mg_printf(conn, "%s: %s\r\n",
  2540. ri.http_headers[i].name, ri.http_headers[i].value);
  2541. }
  2542. (void) mg_write(conn, "\r\n", 2);
  2543. // Send chunk of data that may be read after the headers
  2544. conn->num_bytes_sent += mg_write(conn, buf + headers_len,
  2545. (size_t)(data_len - headers_len));
  2546. // Read the rest of CGI output and send to the client
  2547. send_file_data(conn, out, INT64_MAX);
  2548. done:
  2549. if (pid != (pid_t) -1) {
  2550. kill(pid, SIGKILL);
  2551. }
  2552. if (fd_stdin[0] != -1) {
  2553. (void) close(fd_stdin[0]);
  2554. }
  2555. if (fd_stdout[1] != -1) {
  2556. (void) close(fd_stdout[1]);
  2557. }
  2558. if (in != NULL) {
  2559. (void) fclose(in);
  2560. } else if (fd_stdin[1] != -1) {
  2561. (void) close(fd_stdin[1]);
  2562. }
  2563. if (out != NULL) {
  2564. (void) fclose(out);
  2565. } else if (fd_stdout[0] != -1) {
  2566. (void) close(fd_stdout[0]);
  2567. }
  2568. }
  2569. #endif // !NO_CGI
  2570. // For a given PUT path, create all intermediate subdirectories
  2571. // for given path. Return 0 if the path itself is a directory,
  2572. // or -1 on error, 1 if OK.
  2573. static int put_dir(const char *path) {
  2574. char buf[PATH_MAX];
  2575. const char *s, *p;
  2576. struct mgstat st;
  2577. int len, res = 1;
  2578. for (s = p = path + 2; (p = strchr(s, DIRSEP)) != NULL; s = ++p) {
  2579. len = p - path;
  2580. if (len >= (int) sizeof(buf)) {
  2581. res = -1;
  2582. break;
  2583. }
  2584. memcpy(buf, path, len);
  2585. buf[len] = '\0';
  2586. // Try to create intermediate directory
  2587. DEBUG_TRACE(("mkdir(%s)", buf));
  2588. if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) {
  2589. res = -1;
  2590. break;
  2591. }
  2592. // Is path itself a directory?
  2593. if (p[1] == '\0') {
  2594. res = 0;
  2595. }
  2596. }
  2597. return res;
  2598. }
  2599. static void put_file(struct mg_connection *conn, const char *path) {
  2600. struct mgstat st;
  2601. const char *range;
  2602. int64_t r1, r2;
  2603. FILE *fp;
  2604. int rc;
  2605. conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201;
  2606. if ((rc = put_dir(path)) == 0) {
  2607. mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->request_info.status_code);
  2608. } else if (rc == -1) {
  2609. send_http_error(conn, 500, http_500_error,
  2610. "put_dir(%s): %s", path, strerror(ERRNO));
  2611. } else if ((fp = mg_fopen(path, "wb+")) == NULL) {
  2612. send_http_error(conn, 500, http_500_error,
  2613. "fopen(%s): %s", path, strerror(ERRNO));
  2614. } else {
  2615. set_close_on_exec(fileno(fp));
  2616. range = mg_get_header(conn, "Content-Range");
  2617. r1 = r2 = 0;
  2618. if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
  2619. conn->request_info.status_code = 206;
  2620. // TODO(lsm): handle seek error
  2621. (void) fseeko(fp, (off_t) r1, SEEK_SET);
  2622. }
  2623. if (forward_body_data(conn, fp, INVALID_SOCKET, NULL))
  2624. (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n",
  2625. conn->request_info.status_code);
  2626. (void) fclose(fp);
  2627. }
  2628. }
  2629. static void send_ssi_file(struct mg_connection *, const char *, FILE *, int);
  2630. static void do_ssi_include(struct mg_connection *conn, const char *ssi,
  2631. char *tag, int include_level) {
  2632. char file_name[BUFSIZ], path[PATH_MAX], *p;
  2633. struct vec root;
  2634. int is_ssi;
  2635. FILE *fp;
  2636. get_document_root(conn, &root);
  2637. // sscanf() is safe here, since send_ssi_file() also uses buffer
  2638. // of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ.
  2639. if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
  2640. // File name is relative to the webserver root
  2641. (void) mg_snprintf(conn, path, sizeof(path), "%.*s%c%s",
  2642. root.len, root.ptr, DIRSEP, file_name);
  2643. } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) {
  2644. // File name is relative to the webserver working directory
  2645. // or it is absolute system path
  2646. (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
  2647. } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
  2648. // File name is relative to the currect document
  2649. (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
  2650. if ((p = strrchr(path, DIRSEP)) != NULL) {
  2651. p[1] = '\0';
  2652. }
  2653. (void) mg_snprintf(conn, path + strlen(path),
  2654. sizeof(path) - strlen(path), "%s", file_name);
  2655. } else {
  2656. cry(conn, "Bad SSI #include: [%s]", tag);
  2657. return;
  2658. }
  2659. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2660. cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
  2661. tag, path, strerror(ERRNO));
  2662. } else {
  2663. set_close_on_exec(fileno(fp));
  2664. is_ssi = match_extension(path, conn->ctx->config[SSI_EXTENSIONS]);
  2665. if (is_ssi) {
  2666. send_ssi_file(conn, path, fp, include_level + 1);
  2667. } else {
  2668. send_file_data(conn, fp, INT64_MAX);
  2669. }
  2670. (void) fclose(fp);
  2671. }
  2672. }
  2673. #if !defined(NO_POPEN)
  2674. static void do_ssi_exec(struct mg_connection *conn, char *tag) {
  2675. char cmd[BUFSIZ];
  2676. FILE *fp;
  2677. if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
  2678. cry(conn, "Bad SSI #exec: [%s]", tag);
  2679. } else if ((fp = popen(cmd, "r")) == NULL) {
  2680. cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
  2681. } else {
  2682. send_file_data(conn, fp, INT64_MAX);
  2683. (void) pclose(fp);
  2684. }
  2685. }
  2686. #endif // !NO_POPEN
  2687. static void send_ssi_file(struct mg_connection *conn, const char *path,
  2688. FILE *fp, int include_level) {
  2689. char buf[BUFSIZ];
  2690. int ch, len, in_ssi_tag;
  2691. if (include_level > 10) {
  2692. cry(conn, "SSI #include level is too deep (%s)", path);
  2693. return;
  2694. }
  2695. in_ssi_tag = 0;
  2696. len = 0;
  2697. while ((ch = fgetc(fp)) != EOF) {
  2698. if (in_ssi_tag && ch == '>') {
  2699. in_ssi_tag = 0;
  2700. buf[len++] = (char) ch;
  2701. buf[len] = '\0';
  2702. assert(len <= (int) sizeof(buf));
  2703. if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
  2704. // Not an SSI tag, pass it
  2705. (void) mg_write(conn, buf, (size_t)len);
  2706. } else {
  2707. if (!memcmp(buf + 5, "include", 7)) {
  2708. do_ssi_include(conn, path, buf + 12, include_level);
  2709. #if !defined(NO_POPEN)
  2710. } else if (!memcmp(buf + 5, "exec", 4)) {
  2711. do_ssi_exec(conn, buf + 9);
  2712. #endif // !NO_POPEN
  2713. } else {
  2714. cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
  2715. }
  2716. }
  2717. len = 0;
  2718. } else if (in_ssi_tag) {
  2719. if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
  2720. // Not an SSI tag
  2721. in_ssi_tag = 0;
  2722. } else if (len == (int) sizeof(buf) - 2) {
  2723. cry(conn, "%s: SSI tag is too large", path);
  2724. len = 0;
  2725. }
  2726. buf[len++] = ch & 0xff;
  2727. } else if (ch == '<') {
  2728. in_ssi_tag = 1;
  2729. if (len > 0) {
  2730. (void) mg_write(conn, buf, (size_t)len);
  2731. }
  2732. len = 0;
  2733. buf[len++] = ch & 0xff;
  2734. } else {
  2735. buf[len++] = ch & 0xff;
  2736. if (len == (int) sizeof(buf)) {
  2737. (void) mg_write(conn, buf, (size_t)len);
  2738. len = 0;
  2739. }
  2740. }
  2741. }
  2742. // Send the rest of buffered data
  2743. if (len > 0) {
  2744. (void) mg_write(conn, buf, (size_t)len);
  2745. }
  2746. }
  2747. static void handle_ssi_file_request(struct mg_connection *conn,
  2748. const char *path) {
  2749. FILE *fp;
  2750. if ((fp = mg_fopen(path, "rb")) == NULL) {
  2751. send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
  2752. strerror(ERRNO));
  2753. } else {
  2754. set_close_on_exec(fileno(fp));
  2755. mg_printf(conn, "HTTP/1.1 200 OK\r\n"
  2756. "Content-Type: text/html\r\nConnection: %s\r\n\r\n",
  2757. suggest_connection_header(conn));
  2758. send_ssi_file(conn, path, fp, 0);
  2759. (void) fclose(fp);
  2760. }
  2761. }
  2762. static void send_options(struct mg_connection *conn) {
  2763. conn->request_info.status_code = 200;
  2764. (void) mg_printf(conn,
  2765. "HTTP/1.1 200 OK\r\n"
  2766. "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n"
  2767. "DAV: 1\r\n\r\n");
  2768. }
  2769. // Writes PROPFIND properties for a collection element
  2770. static void print_props(struct mg_connection *conn, const char* uri,
  2771. struct mgstat* st) {
  2772. char mtime[64];
  2773. gmt_time_string(mtime, sizeof(mtime), &st->mtime);
  2774. conn->num_bytes_sent += mg_printf(conn,
  2775. "<d:response>"
  2776. "<d:href>%s</d:href>"
  2777. "<d:propstat>"
  2778. "<d:prop>"
  2779. "<d:resourcetype>%s</d:resourcetype>"
  2780. "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
  2781. "<d:getlastmodified>%s</d:getlastmodified>"
  2782. "</d:prop>"
  2783. "<d:status>HTTP/1.1 200 OK</d:status>"
  2784. "</d:propstat>"
  2785. "</d:response>\n",
  2786. uri,
  2787. st->is_directory ? "<d:collection/>" : "",
  2788. st->size,
  2789. mtime);
  2790. }
  2791. static void print_dav_dir_entry(struct de *de, void *data) {
  2792. char href[PATH_MAX];
  2793. struct mg_connection *conn = (struct mg_connection *) data;
  2794. mg_snprintf(conn, href, sizeof(href), "%s%s",
  2795. conn->request_info.uri, de->file_name);
  2796. print_props(conn, href, &de->st);
  2797. }
  2798. static void handle_propfind(struct mg_connection *conn, const char* path,
  2799. struct mgstat* st) {
  2800. const char *depth = mg_get_header(conn, "Depth");
  2801. conn->request_info.status_code = 207;
  2802. mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
  2803. "Connection: close\r\n"
  2804. "Content-Type: text/xml; charset=utf-8\r\n\r\n");
  2805. conn->num_bytes_sent += mg_printf(conn,
  2806. "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
  2807. "<d:multistatus xmlns:d='DAV:'>\n");
  2808. // Print properties for the requested resource itself
  2809. print_props(conn, conn->request_info.uri, st);
  2810. // If it is a directory, print directory entries too if Depth is not 0
  2811. if (st->is_directory &&
  2812. !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
  2813. (depth == NULL || strcmp(depth, "0") != 0)) {
  2814. scan_directory(conn, path, conn, &print_dav_dir_entry);
  2815. }
  2816. conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
  2817. }
  2818. // This is the heart of the Mongoose's logic.
  2819. // This function is called when the request is read, parsed and validated,
  2820. // and Mongoose must decide what action to take: serve a file, or
  2821. // a directory, or call embedded function, etcetera.
  2822. static void handle_request(struct mg_connection *conn) {
  2823. struct mg_request_info *ri = &conn->request_info;
  2824. char path[PATH_MAX];
  2825. int uri_len;
  2826. struct mgstat st;
  2827. if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
  2828. * conn->request_info.query_string++ = '\0';
  2829. }
  2830. uri_len = strlen(ri->uri);
  2831. url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0);
  2832. remove_double_dots_and_double_slashes(ri->uri);
  2833. convert_uri_to_file_name(conn, ri->uri, path, sizeof(path));
  2834. DEBUG_TRACE(("%s", ri->uri));
  2835. if (!check_authorization(conn, path)) {
  2836. send_authorization_request(conn);
  2837. } else if (call_user(conn, MG_NEW_REQUEST) != NULL) {
  2838. // Do nothing, callback has served the request
  2839. } else if (!strcmp(ri->request_method, "OPTIONS")) {
  2840. send_options(conn);
  2841. } else if (strstr(path, PASSWORDS_FILE_NAME)) {
  2842. // Do not allow to view passwords files
  2843. send_http_error(conn, 403, "Forbidden", "Access Forbidden");
  2844. } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
  2845. send_http_error(conn, 404, "Not Found", "Not Found");
  2846. } else if ((!strcmp(ri->request_method, "PUT") ||
  2847. !strcmp(ri->request_method, "DELETE")) &&
  2848. (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ||
  2849. !is_authorized_for_put(conn))) {
  2850. send_authorization_request(conn);
  2851. } else if (!strcmp(ri->request_method, "PUT")) {
  2852. put_file(conn, path);
  2853. } else if (!strcmp(ri->request_method, "DELETE")) {
  2854. if (mg_remove(path) == 0) {
  2855. send_http_error(conn, 200, "OK", "");
  2856. } else {
  2857. send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
  2858. strerror(ERRNO));
  2859. }
  2860. } else if (mg_stat(path, &st) != 0) {
  2861. send_http_error(conn, 404, "Not Found", "%s", "File not found");
  2862. } else if (st.is_directory && ri->uri[uri_len - 1] != '/') {
  2863. (void) mg_printf(conn,
  2864. "HTTP/1.1 301 Moved Permanently\r\n"
  2865. "Location: %s/\r\n\r\n", ri->uri);
  2866. } else if (!strcmp(ri->request_method, "PROPFIND")) {
  2867. handle_propfind(conn, path, &st);
  2868. } else if (st.is_directory &&
  2869. !substitute_index_file(conn, path, sizeof(path), &st)) {
  2870. if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
  2871. handle_directory_request(conn, path);
  2872. } else {
  2873. send_http_error(conn, 403, "Directory Listing Denied",
  2874. "Directory listing denied");
  2875. }
  2876. #if !defined(NO_CGI)
  2877. } else if (match_extension(path, conn->ctx->config[CGI_EXTENSIONS])) {
  2878. if (strcmp(ri->request_method, "POST") &&
  2879. strcmp(ri->request_method, "GET")) {
  2880. send_http_error(conn, 501, "Not Implemented",
  2881. "Method %s is not implemented", ri->request_method);
  2882. } else {
  2883. handle_cgi_request(conn, path);
  2884. }
  2885. #endif // !NO_CGI
  2886. } else if (match_extension(path, conn->ctx->config[SSI_EXTENSIONS])) {
  2887. handle_ssi_file_request(conn, path);
  2888. } else if (is_not_modified(conn, &st)) {
  2889. send_http_error(conn, 304, "Not Modified", "");
  2890. } else {
  2891. handle_file_request(conn, path, &st);
  2892. }
  2893. }
  2894. static void close_all_listening_sockets(struct mg_context *ctx) {
  2895. struct socket *sp, *tmp;
  2896. for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) {
  2897. tmp = sp->next;
  2898. (void) closesocket(sp->sock);
  2899. free(sp);
  2900. }
  2901. }
  2902. // Valid listening port specification is: [ip_address:]port[s|p]
  2903. // Examples: 80, 443s, 127.0.0.1:3128p, 1.2.3.4:8080sp
  2904. static int parse_port_string(const struct vec *vec, struct socket *so) {
  2905. struct usa *usa = &so->lsa;
  2906. int a, b, c, d, port, len;
  2907. // MacOS needs that. If we do not zero it, subsequent bind() will fail.
  2908. memset(so, 0, sizeof(*so));
  2909. if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) {
  2910. // IP address to bind to is specified
  2911. usa->u.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
  2912. } else if (sscanf(vec->ptr, "%d%n", &port, &len) == 1) {
  2913. // Only port number is specified. Bind to all addresses
  2914. usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY);
  2915. } else {
  2916. return 0;
  2917. }
  2918. assert(len > 0 && len <= (int) vec->len);
  2919. if (strchr("sp,", vec->ptr[len]) == NULL) {
  2920. return 0;
  2921. }
  2922. so->is_ssl = vec->ptr[len] == 's';
  2923. so->is_proxy = vec->ptr[len] == 'p';
  2924. usa->len = sizeof(usa->u.sin);
  2925. usa->u.sin.sin_family = AF_INET;
  2926. usa->u.sin.sin_port = htons((uint16_t) port);
  2927. return 1;
  2928. }
  2929. static int set_ports_option(struct mg_context *ctx) {
  2930. const char *list = ctx->config[LISTENING_PORTS];
  2931. int on = 1, success = 1;
  2932. SOCKET sock;
  2933. struct vec vec;
  2934. struct socket so, *listener;
  2935. while (success && (list = next_option(list, &vec, NULL)) != NULL) {
  2936. if (!parse_port_string(&vec, &so)) {
  2937. cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
  2938. __func__, vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]");
  2939. success = 0;
  2940. } else if (so.is_ssl && ctx->ssl_ctx == NULL) {
  2941. cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
  2942. success = 0;
  2943. } else if ((sock = socket(PF_INET, SOCK_STREAM, 6)) == INVALID_SOCKET ||
  2944. #if !defined(_WIN32)
  2945. // On Windows, SO_REUSEADDR is recommended only for
  2946. // broadcast UDP sockets
  2947. setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
  2948. sizeof(on)) != 0 ||
  2949. #endif // !_WIN32
  2950. // Set TCP keep-alive. This is needed because if HTTP-level
  2951. // keep-alive is enabled, and client resets the connection,
  2952. // server won't get TCP FIN or RST and will keep the connection
  2953. // open forever. With TCP keep-alive, next keep-alive
  2954. // handshake will figure out that the client is down and
  2955. // will close the server end.
  2956. // Thanks to Igor Klopov who suggested the patch.
  2957. setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &on,
  2958. sizeof(on)) != 0 ||
  2959. bind(sock, &so.lsa.u.sa, so.lsa.len) != 0 ||
  2960. listen(sock, 100) != 0) {
  2961. closesocket(sock);
  2962. cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__,
  2963. vec.len, vec.ptr, strerror(ERRNO));
  2964. success = 0;
  2965. } else if ((listener = (struct socket *)
  2966. calloc(1, sizeof(*listener))) == NULL) {
  2967. closesocket(sock);
  2968. cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO));
  2969. success = 0;
  2970. } else {
  2971. *listener = so;
  2972. listener->sock = sock;
  2973. set_close_on_exec(listener->sock);
  2974. listener->next = ctx->listening_sockets;
  2975. ctx->listening_sockets = listener;
  2976. }
  2977. }
  2978. if (!success) {
  2979. close_all_listening_sockets(ctx);
  2980. }
  2981. return success;
  2982. }
  2983. static void log_header(const struct mg_connection *conn, const char *header,
  2984. FILE *fp) {
  2985. const char *header_value;
  2986. if ((header_value = mg_get_header(conn, header)) == NULL) {
  2987. (void) fprintf(fp, "%s", " -");
  2988. } else {
  2989. (void) fprintf(fp, " \"%s\"", header_value);
  2990. }
  2991. }
  2992. static void log_access(const struct mg_connection *conn) {
  2993. const struct mg_request_info *ri;
  2994. FILE *fp;
  2995. char date[64];
  2996. fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
  2997. mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
  2998. if (fp == NULL)
  2999. return;
  3000. (void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
  3001. localtime(&conn->birth_time));
  3002. ri = &conn->request_info;
  3003. flockfile(fp);
  3004. (void) fprintf(fp,
  3005. "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
  3006. inet_ntoa(conn->client.rsa.u.sin.sin_addr),
  3007. ri->remote_user == NULL ? "-" : ri->remote_user,
  3008. date,
  3009. ri->request_method ? ri->request_method : "-",
  3010. ri->uri ? ri->uri : "-",
  3011. ri->http_version,
  3012. conn->request_info.status_code, conn->num_bytes_sent);
  3013. log_header(conn, "Referer", fp);
  3014. log_header(conn, "User-Agent", fp);
  3015. (void) fputc('\n', fp);
  3016. (void) fflush(fp);
  3017. funlockfile(fp);
  3018. (void) fclose(fp);
  3019. }
  3020. static int isbyte(int n) {
  3021. return n >= 0 && n <= 255;
  3022. }
  3023. // Verify given socket address against the ACL.
  3024. // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
  3025. static int check_acl(struct mg_context *ctx, const struct usa *usa) {
  3026. int a, b, c, d, n, mask, allowed;
  3027. char flag;
  3028. uint32_t acl_subnet, acl_mask, remote_ip;
  3029. struct vec vec;
  3030. const char *list = ctx->config[ACCESS_CONTROL_LIST];
  3031. if (list == NULL) {
  3032. return 1;
  3033. }
  3034. (void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip));
  3035. // If any ACL is set, deny by default
  3036. allowed = '-';
  3037. while ((list = next_option(list, &vec, NULL)) != NULL) {
  3038. mask = 32;
  3039. if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n", &flag, &a, &b, &c, &d, &n) != 5) {
  3040. cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
  3041. return -1;
  3042. } else if (flag != '+' && flag != '-') {
  3043. cry(fc(ctx), "%s: flag must be + or -: [%s]", __func__, vec.ptr);
  3044. return -1;
  3045. } else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) {
  3046. cry(fc(ctx), "%s: bad ip address: [%s]", __func__, vec.ptr);
  3047. return -1;
  3048. } else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) {
  3049. // Do nothing, no mask specified
  3050. } else if (mask < 0 || mask > 32) {
  3051. cry(fc(ctx), "%s: bad subnet mask: %d [%s]", __func__, n, vec.ptr);
  3052. return -1;
  3053. }
  3054. acl_subnet = (a << 24) | (b << 16) | (c << 8) | d;
  3055. acl_mask = mask ? 0xffffffffU << (32 - mask) : 0;
  3056. if (acl_subnet == (ntohl(remote_ip) & acl_mask)) {
  3057. allowed = flag;
  3058. }
  3059. }
  3060. return allowed == '+';
  3061. }
  3062. static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) {
  3063. FD_SET(fd, set);
  3064. if (fd > (SOCKET) *max_fd) {
  3065. *max_fd = (int) fd;
  3066. }
  3067. }
  3068. #if !defined(_WIN32)
  3069. static int set_uid_option(struct mg_context *ctx) {
  3070. struct passwd *pw;
  3071. const char *uid = ctx->config[RUN_AS_USER];
  3072. int success = 0;
  3073. if (uid == NULL) {
  3074. success = 1;
  3075. } else {
  3076. if ((pw = getpwnam(uid)) == NULL) {
  3077. cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
  3078. } else if (setgid(pw->pw_gid) == -1) {
  3079. cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
  3080. } else if (setuid(pw->pw_uid) == -1) {
  3081. cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
  3082. } else {
  3083. success = 1;
  3084. }
  3085. }
  3086. return success;
  3087. }
  3088. #endif // !_WIN32
  3089. #if !defined(NO_SSL)
  3090. static pthread_mutex_t *ssl_mutexes;
  3091. static void ssl_locking_callback(int mode, int mutex_num, const char *file,
  3092. int line) {
  3093. line = 0; // Unused
  3094. file = NULL; // Unused
  3095. if (mode & CRYPTO_LOCK) {
  3096. (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
  3097. } else {
  3098. (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
  3099. }
  3100. }
  3101. static unsigned long ssl_id_callback(void) {
  3102. return (unsigned long) pthread_self();
  3103. }
  3104. #if !defined(NO_SSL_DL)
  3105. static int load_dll(struct mg_context *ctx, const char *dll_name,
  3106. struct ssl_func *sw) {
  3107. union {void *p; void (*fp)(void);} u;
  3108. void *dll_handle;
  3109. struct ssl_func *fp;
  3110. if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
  3111. cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
  3112. return 0;
  3113. }
  3114. for (fp = sw; fp->name != NULL; fp++) {
  3115. #ifdef _WIN32
  3116. // GetProcAddress() returns pointer to function
  3117. u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
  3118. #else
  3119. // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
  3120. // function pointers. We need to use a union to make a cast.
  3121. u.p = dlsym(dll_handle, fp->name);
  3122. #endif // _WIN32
  3123. if (u.fp == NULL) {
  3124. cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
  3125. return 0;
  3126. } else {
  3127. fp->ptr = u.fp;
  3128. }
  3129. }
  3130. return 1;
  3131. }
  3132. #endif // NO_SSL_DL
  3133. // Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
  3134. static int set_ssl_option(struct mg_context *ctx) {
  3135. struct mg_request_info request_info;
  3136. SSL_CTX *CTX;
  3137. int i, size;
  3138. const char *pem = ctx->config[SSL_CERTIFICATE];
  3139. const char *chain = ctx->config[SSL_CHAIN_FILE];
  3140. if (pem == NULL) {
  3141. return 1;
  3142. }
  3143. #if !defined(NO_SSL_DL)
  3144. if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
  3145. !load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
  3146. return 0;
  3147. }
  3148. #endif // NO_SSL_DL
  3149. // Initialize SSL crap
  3150. SSL_library_init();
  3151. SSL_load_error_strings();
  3152. if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL) {
  3153. cry(fc(ctx), "SSL_CTX_new error: %s", ssl_error());
  3154. } else if (ctx->user_callback != NULL) {
  3155. memset(&request_info, 0, sizeof(request_info));
  3156. request_info.user_data = ctx->user_data;
  3157. ctx->user_callback(MG_INIT_SSL, (struct mg_connection *) CTX,
  3158. &request_info);
  3159. }
  3160. if (CTX != NULL && SSL_CTX_use_certificate_file(CTX, pem,
  3161. SSL_FILETYPE_PEM) == 0) {
  3162. cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
  3163. return 0;
  3164. } else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(CTX, pem,
  3165. SSL_FILETYPE_PEM) == 0) {
  3166. cry(fc(ctx), "%s: cannot open %s: %s", NULL, pem, ssl_error());
  3167. return 0;
  3168. }
  3169. if (CTX != NULL && chain != NULL &&
  3170. SSL_CTX_use_certificate_chain_file(CTX, chain) == 0) {
  3171. cry(fc(ctx), "%s: cannot open %s: %s", NULL, chain, ssl_error());
  3172. return 0;
  3173. }
  3174. // Initialize locking callbacks, needed for thread safety.
  3175. // http://www.openssl.org/support/faq.html#PROG1
  3176. size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
  3177. if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
  3178. cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
  3179. return 0;
  3180. }
  3181. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3182. pthread_mutex_init(&ssl_mutexes[i], NULL);
  3183. }
  3184. CRYPTO_set_locking_callback(&ssl_locking_callback);
  3185. CRYPTO_set_id_callback(&ssl_id_callback);
  3186. // Done with everything. Save the context.
  3187. ctx->ssl_ctx = CTX;
  3188. return 1;
  3189. }
  3190. static void uninitialize_ssl(struct mg_context *ctx) {
  3191. int i;
  3192. if (ctx->ssl_ctx != NULL) {
  3193. CRYPTO_set_locking_callback(NULL);
  3194. for (i = 0; i < CRYPTO_num_locks(); i++) {
  3195. pthread_mutex_destroy(&ssl_mutexes[i]);
  3196. }
  3197. CRYPTO_set_locking_callback(NULL);
  3198. CRYPTO_set_id_callback(NULL);
  3199. }
  3200. }
  3201. #endif // !NO_SSL
  3202. static int set_gpass_option(struct mg_context *ctx) {
  3203. struct mgstat mgstat;
  3204. const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
  3205. return path == NULL || mg_stat(path, &mgstat) == 0;
  3206. }
  3207. static int set_acl_option(struct mg_context *ctx) {
  3208. struct usa fake;
  3209. return check_acl(ctx, &fake) != -1;
  3210. }
  3211. static void reset_per_request_attributes(struct mg_connection *conn) {
  3212. struct mg_request_info *ri = &conn->request_info;
  3213. // Reset request info attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
  3214. if (ri->remote_user != NULL) {
  3215. free((void *) ri->remote_user);
  3216. }
  3217. ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
  3218. ri->num_headers = 0;
  3219. ri->status_code = -1;
  3220. conn->num_bytes_sent = conn->consumed_content = 0;
  3221. conn->content_len = -1;
  3222. conn->request_len = conn->data_len = 0;
  3223. }
  3224. static void close_socket_gracefully(SOCKET sock) {
  3225. char buf[BUFSIZ];
  3226. struct linger linger;
  3227. int n;
  3228. // Set linger option to avoid socket hanging out after close. This prevent
  3229. // ephemeral port exhaust problem under high QPS.
  3230. linger.l_onoff = 1;
  3231. linger.l_linger = 1;
  3232. setsockopt(sock, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
  3233. // Send FIN to the client
  3234. (void) shutdown(sock, SHUT_WR);
  3235. set_non_blocking_mode(sock);
  3236. // Read and discard pending data. If we do not do that and close the
  3237. // socket, the data in the send buffer may be discarded. This
  3238. // behaviour is seen on Windows, when client keeps sending data
  3239. // when server decide to close the connection; then when client
  3240. // does recv() it gets no data back.
  3241. do {
  3242. n = pull(NULL, sock, NULL, buf, sizeof(buf));
  3243. } while (n > 0);
  3244. // Now we know that our FIN is ACK-ed, safe to close
  3245. (void) closesocket(sock);
  3246. }
  3247. static void close_connection(struct mg_connection *conn) {
  3248. if (conn->ssl) {
  3249. SSL_free(conn->ssl);
  3250. conn->ssl = NULL;
  3251. }
  3252. if (conn->client.sock != INVALID_SOCKET) {
  3253. close_socket_gracefully(conn->client.sock);
  3254. }
  3255. }
  3256. static void discard_current_request_from_buffer(struct mg_connection *conn) {
  3257. char *buffered;
  3258. int buffered_len, body_len;
  3259. buffered = conn->buf + conn->request_len;
  3260. buffered_len = conn->data_len - conn->request_len;
  3261. assert(buffered_len >= 0);
  3262. if (conn->content_len == -1) {
  3263. body_len = 0;
  3264. } else if (conn->content_len < (int64_t) buffered_len) {
  3265. body_len = (int) conn->content_len;
  3266. } else {
  3267. body_len = buffered_len;
  3268. }
  3269. conn->data_len -= conn->request_len + body_len;
  3270. memmove(conn->buf, conn->buf + conn->request_len + body_len,
  3271. (size_t) conn->data_len);
  3272. }
  3273. static int parse_url(const char *url, char *host, int *port) {
  3274. int len;
  3275. if (sscanf(url, "%*[htps]://%1024[^:]:%d%n", host, port, &len) == 2 ||
  3276. sscanf(url, "%1024[^:]:%d%n", host, port, &len) == 2) {
  3277. } else if (sscanf(url, "%*[htps]://%1024[^/]%n", host, &len) == 1) {
  3278. *port = 80;
  3279. } else {
  3280. sscanf(url, "%1024[^/]%n", host, &len);
  3281. *port = 80;
  3282. }
  3283. DEBUG_TRACE(("Host:%s, port:%d", host, *port));
  3284. return len;
  3285. }
  3286. static void handle_proxy_request(struct mg_connection *conn) {
  3287. struct mg_request_info *ri = &conn->request_info;
  3288. char host[1025], buf[BUFSIZ];
  3289. int port, is_ssl, len, i, n;
  3290. DEBUG_TRACE(("URL: %s", ri->uri));
  3291. if (ri->uri == NULL ||
  3292. ri->uri[0] == '/' ||
  3293. (len = parse_url(ri->uri, host, &port)) == 0) {
  3294. return;
  3295. }
  3296. if (conn->peer == NULL) {
  3297. is_ssl = !strcmp(ri->request_method, "CONNECT");
  3298. if ((conn->peer = mg_connect(conn, host, port, is_ssl)) == NULL) {
  3299. return;
  3300. }
  3301. conn->peer->client.is_ssl = is_ssl;
  3302. }
  3303. // Forward client's request to the target
  3304. mg_printf(conn->peer, "%s %s HTTP/%s\r\n", ri->request_method, ri->uri + len,
  3305. ri->http_version);
  3306. // And also all headers. TODO(lsm): anonymize!
  3307. for (i = 0; i < ri->num_headers; i++) {
  3308. mg_printf(conn->peer, "%s: %s\r\n", ri->http_headers[i].name,
  3309. ri->http_headers[i].value);
  3310. }
  3311. // End of headers, final newline
  3312. mg_write(conn->peer, "\r\n", 2);
  3313. // Read and forward body data if any
  3314. if (!strcmp(ri->request_method, "POST")) {
  3315. forward_body_data(conn, NULL, conn->peer->client.sock, conn->peer->ssl);
  3316. }
  3317. // Read data from the target and forward it to the client
  3318. while ((n = pull(NULL, conn->peer->client.sock, conn->peer->ssl,
  3319. buf, sizeof(buf))) > 0) {
  3320. if (mg_write(conn, buf, (size_t)n) != n) {
  3321. break;
  3322. }
  3323. }
  3324. if (!conn->peer->client.is_ssl) {
  3325. close_connection(conn->peer);
  3326. free(conn->peer);
  3327. conn->peer = NULL;
  3328. }
  3329. }
  3330. static int is_valid_uri(const char *uri) {
  3331. // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
  3332. // URI can be an asterisk (*) or should start with slash.
  3333. return (uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0'));
  3334. }
  3335. static void process_new_connection(struct mg_connection *conn) {
  3336. struct mg_request_info *ri = &conn->request_info;
  3337. int keep_alive_enabled;
  3338. const char *cl;
  3339. keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
  3340. do {
  3341. reset_per_request_attributes(conn);
  3342. // If next request is not pipelined, read it in
  3343. if ((conn->request_len = get_request_len(conn->buf, conn->data_len)) == 0) {
  3344. conn->request_len = read_request(NULL, conn->client.sock, conn->ssl,
  3345. conn->buf, conn->buf_size, &conn->data_len);
  3346. }
  3347. assert(conn->data_len >= conn->request_len);
  3348. if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
  3349. send_http_error(conn, 413, "Request Too Large", "");
  3350. return;
  3351. } if (conn->request_len <= 0) {
  3352. return; // Remote end closed the connection
  3353. }
  3354. // Nul-terminate the request cause parse_http_request() uses sscanf
  3355. conn->buf[conn->request_len - 1] = '\0';
  3356. if (!parse_http_request(conn->buf, ri) ||
  3357. (!conn->client.is_proxy && !is_valid_uri(ri->uri))) {
  3358. // Do not put garbage in the access log, just send it back to the client
  3359. send_http_error(conn, 400, "Bad Request",
  3360. "Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf);
  3361. } else if (strcmp(ri->http_version, "1.0") &&
  3362. strcmp(ri->http_version, "1.1")) {
  3363. // Request seems valid, but HTTP version is strange
  3364. send_http_error(conn, 505, "HTTP version not supported", "");
  3365. log_access(conn);
  3366. } else {
  3367. // Request is valid, handle it
  3368. cl = get_header(ri, "Content-Length");
  3369. conn->content_len = cl == NULL ? -1 : strtoll(cl, NULL, 10);
  3370. conn->birth_time = time(NULL);
  3371. if (conn->client.is_proxy) {
  3372. handle_proxy_request(conn);
  3373. } else {
  3374. handle_request(conn);
  3375. }
  3376. log_access(conn);
  3377. discard_current_request_from_buffer(conn);
  3378. }
  3379. // conn->peer is not NULL only for SSL-ed proxy connections
  3380. } while (conn->ctx->stop_flag == 0 &&
  3381. (conn->peer || (keep_alive_enabled && should_keep_alive(conn))));
  3382. }
  3383. // Worker threads take accepted socket from the queue
  3384. static int consume_socket(struct mg_context *ctx, struct socket *sp) {
  3385. (void) pthread_mutex_lock(&ctx->mutex);
  3386. DEBUG_TRACE(("going idle"));
  3387. // If the queue is empty, wait. We're idle at this point.
  3388. while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
  3389. pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
  3390. }
  3391. // If we're stopping, sq_head may be equal to sq_tail.
  3392. if (ctx->sq_head > ctx->sq_tail) {
  3393. // Copy socket from the queue and increment tail
  3394. *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
  3395. ctx->sq_tail++;
  3396. DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
  3397. // Wrap pointers if needed
  3398. while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
  3399. ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
  3400. ctx->sq_head -= ARRAY_SIZE(ctx->queue);
  3401. }
  3402. }
  3403. (void) pthread_cond_signal(&ctx->sq_empty);
  3404. (void) pthread_mutex_unlock(&ctx->mutex);
  3405. return !ctx->stop_flag;
  3406. }
  3407. static void worker_thread(struct mg_context *ctx) {
  3408. struct mg_connection *conn;
  3409. int buf_size = atoi(ctx->config[MAX_REQUEST_SIZE]);
  3410. conn = (struct mg_connection *) calloc(1, sizeof(*conn) + buf_size);
  3411. conn->buf_size = buf_size;
  3412. conn->buf = (char *) (conn + 1);
  3413. assert(conn != NULL);
  3414. // Call consume_socket() even when ctx->stop_flag > 0, to let it signal
  3415. // sq_empty condvar to wake up the master waiting in produce_socket()
  3416. while (consume_socket(ctx, &conn->client)) {
  3417. conn->birth_time = time(NULL);
  3418. conn->ctx = ctx;
  3419. // Fill in IP, port info early so even if SSL setup below fails,
  3420. // error handler would have the corresponding info.
  3421. // Thanks to Johannes Winkelmann for the patch.
  3422. conn->request_info.remote_port = ntohs(conn->client.rsa.u.sin.sin_port);
  3423. memcpy(&conn->request_info.remote_ip,
  3424. &conn->client.rsa.u.sin.sin_addr.s_addr, 4);
  3425. conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
  3426. conn->request_info.is_ssl = conn->client.is_ssl;
  3427. if (!conn->client.is_ssl ||
  3428. (conn->client.is_ssl && sslize(conn, SSL_accept))) {
  3429. process_new_connection(conn);
  3430. }
  3431. close_connection(conn);
  3432. }
  3433. free(conn);
  3434. // Signal master that we're done with connection and exiting
  3435. (void) pthread_mutex_lock(&ctx->mutex);
  3436. ctx->num_threads--;
  3437. (void) pthread_cond_signal(&ctx->cond);
  3438. assert(ctx->num_threads >= 0);
  3439. (void) pthread_mutex_unlock(&ctx->mutex);
  3440. DEBUG_TRACE(("exiting"));
  3441. }
  3442. // Master thread adds accepted socket to a queue
  3443. static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
  3444. (void) pthread_mutex_lock(&ctx->mutex);
  3445. // If the queue is full, wait
  3446. while (ctx->stop_flag == 0 &&
  3447. ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
  3448. (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
  3449. }
  3450. if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
  3451. // Copy socket to the queue and increment head
  3452. ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
  3453. ctx->sq_head++;
  3454. DEBUG_TRACE(("queued socket %d", sp->sock));
  3455. }
  3456. (void) pthread_cond_signal(&ctx->sq_full);
  3457. (void) pthread_mutex_unlock(&ctx->mutex);
  3458. }
  3459. static void accept_new_connection(const struct socket *listener,
  3460. struct mg_context *ctx) {
  3461. struct socket accepted;
  3462. int allowed;
  3463. accepted.rsa.len = sizeof(accepted.rsa.u.sin);
  3464. accepted.lsa = listener->lsa;
  3465. accepted.sock = accept(listener->sock, &accepted.rsa.u.sa, &accepted.rsa.len);
  3466. if (accepted.sock != INVALID_SOCKET) {
  3467. allowed = check_acl(ctx, &accepted.rsa);
  3468. if (allowed) {
  3469. // Put accepted socket structure into the queue
  3470. DEBUG_TRACE(("accepted socket %d", accepted.sock));
  3471. accepted.is_ssl = listener->is_ssl;
  3472. accepted.is_proxy = listener->is_proxy;
  3473. produce_socket(ctx, &accepted);
  3474. } else {
  3475. cry(fc(ctx), "%s: %s is not allowed to connect",
  3476. __func__, inet_ntoa(accepted.rsa.u.sin.sin_addr));
  3477. (void) closesocket(accepted.sock);
  3478. }
  3479. }
  3480. }
  3481. static void master_thread(struct mg_context *ctx) {
  3482. fd_set read_set;
  3483. struct timeval tv;
  3484. struct socket *sp;
  3485. int max_fd;
  3486. while (ctx->stop_flag == 0) {
  3487. FD_ZERO(&read_set);
  3488. max_fd = -1;
  3489. // Add listening sockets to the read set
  3490. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  3491. add_to_set(sp->sock, &read_set, &max_fd);
  3492. }
  3493. tv.tv_sec = 0;
  3494. tv.tv_usec = 200 * 1000;
  3495. if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) {
  3496. #ifdef _WIN32
  3497. // On windows, if read_set and write_set are empty,
  3498. // select() returns "Invalid parameter" error
  3499. // (at least on my Windows XP Pro). So in this case, we sleep here.
  3500. sleep(1);
  3501. #endif // _WIN32
  3502. } else {
  3503. for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) {
  3504. if (ctx->stop_flag == 0 && FD_ISSET(sp->sock, &read_set)) {
  3505. accept_new_connection(sp, ctx);
  3506. }
  3507. }
  3508. }
  3509. }
  3510. DEBUG_TRACE(("stopping workers"));
  3511. // Stop signal received: somebody called mg_stop. Quit.
  3512. close_all_listening_sockets(ctx);
  3513. // Wakeup workers that are waiting for connections to handle.
  3514. pthread_cond_broadcast(&ctx->sq_full);
  3515. // Wait until all threads finish
  3516. (void) pthread_mutex_lock(&ctx->mutex);
  3517. while (ctx->num_threads > 0) {
  3518. (void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
  3519. }
  3520. (void) pthread_mutex_unlock(&ctx->mutex);
  3521. // All threads exited, no sync is needed. Destroy mutex and condvars
  3522. (void) pthread_mutex_destroy(&ctx->mutex);
  3523. (void) pthread_cond_destroy(&ctx->cond);
  3524. (void) pthread_cond_destroy(&ctx->sq_empty);
  3525. (void) pthread_cond_destroy(&ctx->sq_full);
  3526. #if !defined(NO_SSL)
  3527. uninitialize_ssl(ctx);
  3528. #endif
  3529. // Signal mg_stop() that we're done
  3530. ctx->stop_flag = 2;
  3531. DEBUG_TRACE(("exiting"));
  3532. }
  3533. static void free_context(struct mg_context *ctx) {
  3534. int i;
  3535. // Deallocate config parameters
  3536. for (i = 0; i < NUM_OPTIONS; i++) {
  3537. if (ctx->config[i] != NULL)
  3538. free(ctx->config[i]);
  3539. }
  3540. // Deallocate SSL context
  3541. if (ctx->ssl_ctx != NULL) {
  3542. SSL_CTX_free(ctx->ssl_ctx);
  3543. }
  3544. #ifndef NO_SSL
  3545. if (ssl_mutexes != NULL) {
  3546. free(ssl_mutexes);
  3547. }
  3548. #endif // !NO_SSL
  3549. // Deallocate context itself
  3550. free(ctx);
  3551. }
  3552. void mg_stop(struct mg_context *ctx) {
  3553. ctx->stop_flag = 1;
  3554. // Wait until mg_fini() stops
  3555. while (ctx->stop_flag != 2) {
  3556. (void) sleep(0);
  3557. }
  3558. free_context(ctx);
  3559. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  3560. (void) WSACleanup();
  3561. #endif // _WIN32
  3562. }
  3563. struct mg_context *mg_start(mg_callback_t user_callback, void *user_data,
  3564. const char **options) {
  3565. struct mg_context *ctx;
  3566. const char *name, *value, *default_value;
  3567. int i;
  3568. #if defined(_WIN32) && !defined(__SYMBIAN32__)
  3569. WSADATA data;
  3570. WSAStartup(MAKEWORD(2,2), &data);
  3571. #endif // _WIN32
  3572. // Allocate context and initialize reasonable general case defaults.
  3573. // TODO(lsm): do proper error handling here.
  3574. ctx = (struct mg_context *) calloc(1, sizeof(*ctx));
  3575. ctx->user_callback = user_callback;
  3576. ctx->user_data = user_data;
  3577. while (options && (name = *options++) != NULL) {
  3578. if ((i = get_option_index(name)) == -1) {
  3579. cry(fc(ctx), "Invalid option: %s", name);
  3580. free_context(ctx);
  3581. return NULL;
  3582. } else if ((value = *options++) == NULL) {
  3583. cry(fc(ctx), "%s: option value cannot be NULL", name);
  3584. free_context(ctx);
  3585. return NULL;
  3586. }
  3587. ctx->config[i] = mg_strdup(value);
  3588. DEBUG_TRACE(("[%s] -> [%s]", name, value));
  3589. }
  3590. // Set default value if needed
  3591. for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) {
  3592. default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2];
  3593. if (ctx->config[i] == NULL && default_value != NULL) {
  3594. ctx->config[i] = mg_strdup(default_value);
  3595. DEBUG_TRACE(("Setting default: [%s] -> [%s]",
  3596. config_options[i * ENTRIES_PER_CONFIG_OPTION + 1],
  3597. default_value));
  3598. }
  3599. }
  3600. // NOTE(lsm): order is important here. SSL certificates must
  3601. // be initialized before listening ports. UID must be set last.
  3602. if (!set_gpass_option(ctx) ||
  3603. #if !defined(NO_SSL)
  3604. !set_ssl_option(ctx) ||
  3605. #endif
  3606. !set_ports_option(ctx) ||
  3607. #if !defined(_WIN32)
  3608. !set_uid_option(ctx) ||
  3609. #endif
  3610. !set_acl_option(ctx)) {
  3611. free_context(ctx);
  3612. return NULL;
  3613. }
  3614. #if !defined(_WIN32) && !defined(__SYMBIAN32__)
  3615. // Ignore SIGPIPE signal, so if browser cancels the request, it
  3616. // won't kill the whole process.
  3617. (void) signal(SIGPIPE, SIG_IGN);
  3618. // Also ignoring SIGCHLD to let the OS to reap zombies properly.
  3619. (void) signal(SIGCHLD, SIG_IGN);
  3620. #endif // !_WIN32
  3621. (void) pthread_mutex_init(&ctx->mutex, NULL);
  3622. (void) pthread_cond_init(&ctx->cond, NULL);
  3623. (void) pthread_cond_init(&ctx->sq_empty, NULL);
  3624. (void) pthread_cond_init(&ctx->sq_full, NULL);
  3625. // Start master (listening) thread
  3626. start_thread(ctx, (mg_thread_func_t) master_thread, ctx);
  3627. // Start worker threads
  3628. for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
  3629. if (start_thread(ctx, (mg_thread_func_t) worker_thread, ctx) != 0) {
  3630. cry(fc(ctx), "Cannot start worker thread: %d", ERRNO);
  3631. } else {
  3632. ctx->num_threads++;
  3633. }
  3634. }
  3635. return ctx;
  3636. }