4 * This contains a simple multithreaded TCP server manager. It sits around
5 * waiting on the specified port for incoming HTTP connections. When a
6 * connection is established, it calls context_loop() from context_loop.c.
12 #include "webserver.h"
15 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
18 int verbosity = 9; /* Logging level */
19 int msock; /* master listening socket */
20 int is_https = 0; /* Nonzero if I am an HTTPS service */
21 int follow_xff = 0; /* Follow X-Forwarded-For: header */
22 extern void *context_loop(int);
23 extern void *housekeeping_loop(void);
24 extern pthread_mutex_t SessionListMutex;
25 extern pthread_key_t MyConKey;
28 char *server_cookie = NULL;
31 char *ctdlhost = DEFAULT_HOST;
32 char *ctdlport = DEFAULT_PORT;
34 char wizard_filename[PATH_MAX];
37 * This is a generic function to set up a master socket for listening on
38 * a TCP port. The server shuts down if the bind fails.
40 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
42 struct sockaddr_in sin;
45 memset(&sin, 0, sizeof(sin));
46 sin.sin_family = AF_INET;
47 if (ip_addr == NULL) {
48 sin.sin_addr.s_addr = INADDR_ANY;
50 sin.sin_addr.s_addr = inet_addr(ip_addr);
53 if (sin.sin_addr.s_addr == INADDR_NONE) {
54 sin.sin_addr.s_addr = INADDR_ANY;
57 if (port_number == 0) {
58 lprintf(1, "Cannot start: no port number specified.\n");
61 sin.sin_port = htons((u_short) port_number);
63 s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
65 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
68 /* Set some socket options that make sense. */
70 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
72 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
73 lprintf(1, "Can't bind: %s\n", strerror(errno));
76 if (listen(s, queue_len) < 0) {
77 lprintf(1, "Can't listen: %s\n", strerror(errno));
85 * Read data from the client socket.
87 * 1 Requested number of bytes has been read.
88 * 0 Request timed out.
89 * -1 Connection is broken, or other error.
91 int client_read_to(int sock, char *buf, int bytes, int timeout)
101 return (client_read_ssl(buf, bytes, timeout));
106 while (len < bytes) {
112 retval = select((sock) + 1, &rfds, NULL, NULL, &tv);
113 if (FD_ISSET(sock, &rfds) == 0) {
117 rlen = read(sock, &buf[len], bytes - len);
120 lprintf(2, "client_read() failed: %s\n",
128 write(2, "\033[32m", 5);
129 write(2, buf, bytes);
130 write(2, "\033[30m", 5);
136 ssize_t client_write(const void *buf, size_t count)
139 if (WC->burst != NULL) {
141 realloc(WC->burst, (WC->burst_len + count + 2));
142 memcpy(&WC->burst[WC->burst_len], buf, count);
143 WC->burst_len += count;
148 client_write_ssl((char *) buf, count);
153 write(2, "\033[34m", 5);
154 write(2, buf, count);
155 write(2, "\033[30m", 5);
157 return (write(WC->http_sock, buf, count));
161 void begin_burst(void)
163 if (WC->burst != NULL) {
168 WC->burst = malloc(SIZ);
173 * compress_gzip() uses the same calling syntax as compress2(), but it
174 * creates a stream compatible with HTTP "Content-encoding: gzip"
177 #define DEF_MEM_LEVEL 8
178 #define OS_CODE 0x03 /* unix */
179 int ZEXPORT compress_gzip(Bytef * dest, uLongf * destLen,
180 const Bytef * source, uLong sourceLen, int level)
182 const int gz_magic[2] = { 0x1f, 0x8b }; /* gzip magic header */
184 /* write gzip header */
185 sprintf((char *) dest, "%c%c%c%c%c%c%c%c%c%c",
186 gz_magic[0], gz_magic[1], Z_DEFLATED,
187 0 /*flags */ , 0, 0, 0, 0 /*time */ , 0 /*xflags */ ,
193 stream.next_in = (Bytef *) source;
194 stream.avail_in = (uInt) sourceLen;
195 stream.next_out = dest + 10L; // after header
196 stream.avail_out = (uInt) * destLen;
197 if ((uLong) stream.avail_out != *destLen)
200 stream.zalloc = (alloc_func) 0;
201 stream.zfree = (free_func) 0;
202 stream.opaque = (voidpf) 0;
204 err = deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS,
205 DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
209 err = deflate(&stream, Z_FINISH);
210 if (err != Z_STREAM_END) {
212 return err == Z_OK ? Z_BUF_ERROR : err;
214 *destLen = stream.total_out + 10L;
216 /* write CRC and Length */
217 uLong crc = crc32(0L, source, sourceLen);
219 for (n = 0; n < 4; ++n, ++*destLen) {
220 dest[*destLen] = (int) (crc & 0xff);
223 uLong len = stream.total_in;
224 for (n = 0; n < 4; ++n, ++*destLen) {
225 dest[*destLen] = (int) (len & 0xff);
228 err = deflateEnd(&stream);
238 if (WC->burst == NULL)
241 the_len = WC->burst_len;
242 the_data = WC->burst;
248 /* Handle gzip compression */
250 char *compressed_data = NULL;
251 uLongf compressed_len;
253 compressed_len = (uLongf) ((the_len * 101) / 100) + 100;
254 compressed_data = malloc(compressed_len);
256 if (compress_gzip((Bytef *) compressed_data,
259 (uLongf) the_len, Z_BEST_SPEED) == Z_OK) {
260 wprintf("Content-encoding: gzip\r\n");
262 the_data = compressed_data;
263 the_len = compressed_len;
265 free(compressed_data);
268 #endif /* HAVE_ZLIB */
270 wprintf("Content-length: %d\r\n\r\n", the_len);
271 client_write(the_data, the_len);
279 * Read data from the client socket with default timeout.
280 * (This is implemented in terms of client_read_to() and could be
281 * justifiably moved out of sysdep.c)
283 int client_read(int sock, char *buf, int bytes)
285 return (client_read_to(sock, buf, bytes, SLEEPING));
290 * client_getln() ... Get a LF-terminated line of text from the client.
291 * (This is implemented in terms of client_read() and could be
292 * justifiably moved out of sysdep.c)
294 int client_getln(int sock, char *buf, int bufsiz)
298 /* Read one character at a time.
301 retval = client_read(sock, &buf[i], 1);
302 if (retval != 1 || buf[i] == '\n' || i == (bufsiz-1))
306 /* If we got a long line, discard characters until the newline.
309 while (buf[i] != '\n' && retval == 1)
310 retval = client_read(sock, &buf[i], 1);
313 * Strip any trailing non-printable characters.
316 while ((strlen(buf) > 0) && (!isprint(buf[strlen(buf) - 1]))) {
317 buf[strlen(buf) - 1] = 0;
324 * Start running as a daemon. Only close stdio if do_close_stdio is set.
326 void start_daemon(int do_close_stdio)
328 if (do_close_stdio) {
333 signal(SIGHUP, SIG_IGN);
334 signal(SIGINT, SIG_IGN);
335 signal(SIGQUIT, SIG_IGN);
340 void spawn_another_worker_thread()
342 pthread_t SessThread; /* Thread descriptor */
343 pthread_attr_t attr; /* Thread attributes */
346 lprintf(3, "Creating a new thread\n");
348 /* set attributes for the new thread */
349 pthread_attr_init(&attr);
350 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
352 /* Our per-thread stacks need to be bigger than the default size, otherwise
353 * the MIME parser crashes on FreeBSD, and the IMAP service crashes on
356 if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
357 lprintf(1, "pthread_attr_setstacksize: %s\n",
359 pthread_attr_destroy(&attr);
362 /* now create the thread */
363 if (pthread_create(&SessThread, &attr,
364 (void *(*)(void *)) worker_entry, NULL)
366 lprintf(1, "Can't create thread: %s\n", strerror(errno));
369 /* free up the attributes */
370 pthread_attr_destroy(&attr);
374 * Here's where it all begins.
376 int main(int argc, char **argv)
378 pthread_t SessThread; /* Thread descriptor */
379 pthread_attr_t attr; /* Thread attributes */
380 int a, i; /* General-purpose variables */
381 int port = PORT_NUM; /* Port to listen on */
382 char tracefile[PATH_MAX];
384 char *webcitdir = WEBCITDIR;
388 /* Parse command line */
390 while ((a = getopt(argc, argv, "h:i:p:t:x:cfs")) != EOF)
392 while ((a = getopt(argc, argv, "h:i:p:t:x:cf")) != EOF)
396 webcitdir = strdup(optarg);
399 safestrncpy(ip_addr, optarg, sizeof ip_addr);
405 safestrncpy(tracefile, optarg, sizeof tracefile);
406 freopen(tracefile, "w", stdout);
407 freopen(tracefile, "w", stderr);
408 freopen(tracefile, "r", stdin);
411 verbosity = atoi(optarg);
417 server_cookie = malloc(256);
418 if (server_cookie != NULL) {
419 safestrncpy(server_cookie,
420 "Set-cookie: wcserver=",
423 (&server_cookie[strlen(server_cookie)],
425 lprintf(2, "gethostname: %s\n",
435 fprintf(stderr, "usage: webserver "
436 "[-i ip_addr] [-p http_port] "
437 "[-t tracefile] [-c] [-f] "
441 "[remotehost [remoteport]]\n");
446 ctdlhost = argv[optind];
448 ctdlport = argv[optind];
450 /* Tell 'em who's in da house */
451 lprintf(1, SERVER "\n");
452 lprintf(1, "Copyright (C) 1996-2005 by the Citadel development team.\n"
453 "This software is distributed under the terms of the "
454 "GNU General Public License.\n\n"
457 lprintf(9, "Changing directory to %s\n", webcitdir);
458 if (chdir(webcitdir) != 0) {
462 /* initialize the International Bright Young Thing */
465 initialize_locales();
467 locale = setlocale(LC_ALL, "");
469 mo = malloc(strlen(webcitdir) + 20);
470 sprintf(mo, "%s/locale", webcitdir);
471 lprintf(9, "Message catalog directory: %s\n",
472 bindtextdomain("webcit", mo)
475 lprintf(9, "Text domain: %s\n",
478 lprintf(9, "Text domain Charset: %s\n",
479 bind_textdomain_codeset("webcit","UTF8")
483 initialize_viewdefs();
487 * Set up a place to put thread-specific data.
488 * We only need a single pointer per thread - it points to the
489 * wcsession struct to which the thread is currently bound.
491 if (pthread_key_create(&MyConKey, NULL) != 0) {
492 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
496 * Set up a place to put thread-specific SSL data.
497 * We don't stick this in the wcsession struct because SSL starts
498 * up before the session is bound, and it gets torn down between
502 if (pthread_key_create(&ThreadSSL, NULL) != 0) {
503 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
508 * Bind the server to our favorite port.
509 * There is no need to check for errors, because ig_tcp_server()
510 * exits if it doesn't succeed.
512 lprintf(2, "Attempting to bind to port %d...\n", port);
513 msock = ig_tcp_server(ip_addr, port, LISTEN_QUEUE_LENGTH);
514 lprintf(2, "Listening on socket %d\n", msock);
515 signal(SIGPIPE, SIG_IGN);
517 pthread_mutex_init(&SessionListMutex, NULL);
520 * Start up the housekeeping thread
522 pthread_attr_init(&attr);
523 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
524 pthread_create(&SessThread, &attr,
525 (void *(*)(void *)) housekeeping_loop, NULL);
529 * If this is an HTTPS server, fire up SSL
537 /* Start a few initial worker threads */
538 for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
539 spawn_another_worker_thread();
542 /* now the original thread becomes another worker */
549 * Entry point for worker threads
551 void worker_entry(void)
556 int fail_this_transaction = 0;
559 /* Only one thread can accept at a time */
560 fail_this_transaction = 0;
561 ssock = accept(msock, NULL, 0);
563 lprintf(2, "accept() failed: %s\n",
566 /* Set the SO_REUSEADDR socket option */
568 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
571 /* If we are an HTTPS server, go crypto now. */
574 if (starttls(ssock) != 0) {
575 fail_this_transaction = 1;
581 if (fail_this_transaction == 0) {
582 /* Perform an HTTP transaction... */
584 /* ...and close the socket. */
585 lingering_close(ssock);
590 } while (!time_to_die);
596 int lprintf(int loglevel, const char *format, ...)
600 if (loglevel <= verbosity) {
601 va_start(ap, format);
602 vfprintf(stderr, format, ap);