5 * \defgroup Webserver This contains a simple multithreaded TCP server manager. It sits around
6 * waiting on the specified port for incoming HTTP connections. When a
7 * 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; /**< our Cookie connection to the client */
31 char *ctdlhost = DEFAULT_HOST; /**< our name */
32 char *ctdlport = DEFAULT_PORT; /**< our Port */
33 int setup_wizard = 0; /**< should we run the setup wizard? \todo */
34 char wizard_filename[PATH_MAX];/**< where's the setup wizard? */
37 * \brief 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.
39 * \param ip_addr ip to bind to
40 * \param port_number the port to bind to
41 * \param queue_len the size of the input queue ????
43 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
45 struct sockaddr_in sin;
48 memset(&sin, 0, sizeof(sin));
49 sin.sin_family = AF_INET;
50 if (ip_addr == NULL) {
51 sin.sin_addr.s_addr = INADDR_ANY;
53 sin.sin_addr.s_addr = inet_addr(ip_addr);
56 if (sin.sin_addr.s_addr == INADDR_NONE) {
57 sin.sin_addr.s_addr = INADDR_ANY;
60 if (port_number == 0) {
61 lprintf(1, "Cannot start: no port number specified.\n");
64 sin.sin_port = htons((u_short) port_number);
66 s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
68 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
71 /** Set some socket options that make sense. */
73 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
75 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
76 lprintf(1, "Can't bind: %s\n", strerror(errno));
79 if (listen(s, queue_len) < 0) {
80 lprintf(1, "Can't listen: %s\n", strerror(errno));
89 * \brief Create a Unix domain socket and listen on it
90 * \param sockpath file name of the unix domain socket
91 * \param queue_len queue size of the kernel fifo????
93 int ig_uds_server(char *sockpath, int queue_len)
95 struct sockaddr_un addr;
100 actual_queue_len = queue_len;
101 if (actual_queue_len < 5) actual_queue_len = 5;
103 i = unlink(sockpath);
104 if (i != 0) if (errno != ENOENT) {
105 lprintf(1, "citserver: can't unlink %s: %s\n",
106 sockpath, strerror(errno));
110 memset(&addr, 0, sizeof(addr));
111 addr.sun_family = AF_UNIX;
112 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
114 s = socket(AF_UNIX, SOCK_STREAM, 0);
116 lprintf(1, "citserver: Can't create a socket: %s\n",
121 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
122 lprintf(1, "citserver: Can't bind: %s\n",
127 if (listen(s, actual_queue_len) < 0) {
128 lprintf(1, "citserver: Can't listen: %s\n",
133 chmod(sockpath, 0777);
141 * \brief Read data from the client socket.
142 * \param sock socket fd to read from ???
143 * \param buf buffer to read into
144 * \param bytes how large is the read buffer?
145 * \param timeout how long should we wait for input?
146 * \return values are\
147 * 1 Requested number of bytes has been read.\
148 * 0 Request timed out.\
149 * -1 Connection is broken, or other error.
151 int client_read_to(int sock, char *buf, int bytes, int timeout)
161 return (client_read_ssl(buf, bytes, timeout));
166 while (len < bytes) {
172 retval = select((sock) + 1, &rfds, NULL, NULL, &tv);
173 if (FD_ISSET(sock, &rfds) == 0) {
177 rlen = read(sock, &buf[len], bytes - len);
180 lprintf(2, "client_read() failed: %s\n",
188 write(2, "\033[32m", 5);
189 write(2, buf, bytes);
190 write(2, "\033[30m", 5);
196 * \brief write data to the client
197 * \param buf data to write to the client
198 * \param count size of buffer
200 ssize_t client_write(const void *buf, size_t count)
203 if (WC->burst != NULL) {
205 realloc(WC->burst, (WC->burst_len + count + 2));
206 memcpy(&WC->burst[WC->burst_len], buf, count);
207 WC->burst_len += count;
212 client_write_ssl((char *) buf, count);
217 write(2, "\033[34m", 5);
218 write(2, buf, count);
219 write(2, "\033[30m", 5);
221 return (write(WC->http_sock, buf, count));
225 * \brief what burst???
227 void begin_burst(void)
229 if (WC->burst != NULL) {
234 WC->burst = malloc(SIZ);
239 * \brief uses the same calling syntax as compress2(), but it
240 * creates a stream compatible with HTTP "Content-encoding: gzip"
243 #define DEF_MEM_LEVEL 8 /**< memlevel??? */
244 #define OS_CODE 0x03 /**< unix */
245 int ZEXPORT compress_gzip(Bytef * dest, /**< compressed buffer*/
246 uLongf * destLen, /**< length of the compresed data */
247 const Bytef * source, /**< source to encode */
248 uLong sourceLen, /**< length of the source to encode */
249 int level) /**< what level??? */
251 const int gz_magic[2] = { 0x1f, 0x8b }; /** gzip magic header */
253 /** write gzip header */
254 sprintf((char *) dest, "%c%c%c%c%c%c%c%c%c%c",
255 gz_magic[0], gz_magic[1], Z_DEFLATED,
256 0 /*flags */ , 0, 0, 0, 0 /*time */ , 0 /** xflags */ ,
262 stream.next_in = (Bytef *) source;
263 stream.avail_in = (uInt) sourceLen;
264 stream.next_out = dest + 10L; // after header
265 stream.avail_out = (uInt) * destLen;
266 if ((uLong) stream.avail_out != *destLen)
269 stream.zalloc = (alloc_func) 0;
270 stream.zfree = (free_func) 0;
271 stream.opaque = (voidpf) 0;
273 err = deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS,
274 DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
278 err = deflate(&stream, Z_FINISH);
279 if (err != Z_STREAM_END) {
281 return err == Z_OK ? Z_BUF_ERROR : err;
283 *destLen = stream.total_out + 10L;
285 /* write CRC and Length */
286 uLong crc = crc32(0L, source, sourceLen);
288 for (n = 0; n < 4; ++n, ++*destLen) {
289 dest[*destLen] = (int) (crc & 0xff);
292 uLong len = stream.total_in;
293 for (n = 0; n < 4; ++n, ++*destLen) {
294 dest[*destLen] = (int) (len & 0xff);
297 err = deflateEnd(&stream);
303 * \brief what burst???
310 if (WC->burst == NULL)
313 the_len = WC->burst_len;
314 the_data = WC->burst;
320 /* Handle gzip compression */
322 char *compressed_data = NULL;
323 uLongf compressed_len;
325 compressed_len = (uLongf) ((the_len * 101) / 100) + 100;
326 compressed_data = malloc(compressed_len);
328 if (compress_gzip((Bytef *) compressed_data,
331 (uLongf) the_len, Z_BEST_SPEED) == Z_OK) {
332 wprintf("Content-encoding: gzip\r\n");
334 the_data = compressed_data;
335 the_len = compressed_len;
337 free(compressed_data);
340 #endif /* HAVE_ZLIB */
342 wprintf("Content-length: %d\r\n\r\n", the_len);
343 client_write(the_data, the_len);
351 * \brief Read data from the client socket with default timeout.
352 * (This is implemented in terms of client_read_to() and could be
353 * justifiably moved out of sysdep.c)
354 * \param sock the socket fd to read from???
355 * \param buf the buffer to write to
356 * \param bytes how large is the buffer
358 int client_read(int sock, char *buf, int bytes)
360 return (client_read_to(sock, buf, bytes, SLEEPING));
365 * \brief Get a LF-terminated line of text from the client.
366 * (This is implemented in terms of client_read() and could be
367 * justifiably moved out of sysdep.c)
368 * \param sock socket fd to get client line from???
369 * \param buf buffer to write read data to
370 * \param bufsiz how many bytes to read
371 * \return numer of bytes read???
373 int client_getln(int sock, char *buf, int bufsiz)
377 /** Read one character at a time.*/
379 retval = client_read(sock, &buf[i], 1);
380 if (retval != 1 || buf[i] == '\n' || i == (bufsiz-1))
384 /** If we got a long line, discard characters until the newline. */
386 while (buf[i] != '\n' && retval == 1)
387 retval = client_read(sock, &buf[i], 1);
390 * Strip any trailing non-printable characters.
393 while ((strlen(buf) > 0) && (!isprint(buf[strlen(buf) - 1]))) {
394 buf[strlen(buf) - 1] = 0;
401 * \brief Start running as a daemon.
402 * param do_close_stdio Only close stdio if set.
404 void start_daemon(int do_close_stdio)
406 if (do_close_stdio) {
411 signal(SIGHUP, SIG_IGN);
412 signal(SIGINT, SIG_IGN);
413 signal(SIGQUIT, SIG_IGN);
418 void spawn_another_worker_thread()
420 pthread_t SessThread; /**< Thread descriptor */
421 pthread_attr_t attr; /**< Thread attributes */
424 lprintf(3, "Creating a new thread\n");
426 /** set attributes for the new thread */
427 pthread_attr_init(&attr);
428 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
431 * Our per-thread stacks need to be bigger than the default size, otherwise
432 * the MIME parser crashes on FreeBSD, and the IMAP service crashes on
435 if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
436 lprintf(1, "pthread_attr_setstacksize: %s\n",
438 pthread_attr_destroy(&attr);
441 /** now create the thread */
442 if (pthread_create(&SessThread, &attr,
443 (void *(*)(void *)) worker_entry, NULL)
445 lprintf(1, "Can't create thread: %s\n", strerror(errno));
448 /** free up the attributes */
449 pthread_attr_destroy(&attr);
453 * \brief Here's where it all begins.
454 * \param argc number of commandline args
455 * \param argv the commandline arguments
457 int main(int argc, char **argv)
459 pthread_t SessThread; /**< Thread descriptor */
460 pthread_attr_t attr; /**< Thread attributes */
461 int a, i; /**< General-purpose variables */
462 int port = PORT_NUM; /**< Port to listen on */
463 char tracefile[PATH_MAX];
465 char *webcitdir = WEBCITDIR;
469 #endif /* ENABLE_NLS */
470 char uds_listen_path[PATH_MAX]; /**< listen on a unix domain socket? */
472 strcpy(uds_listen_path, "");
474 /** Parse command line */
476 while ((a = getopt(argc, argv, "h:i:p:t:x:cfs")) != EOF)
478 while ((a = getopt(argc, argv, "h:i:p:t:x:cf")) != EOF)
482 webcitdir = strdup(optarg);
485 safestrncpy(ip_addr, optarg, sizeof ip_addr);
490 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
494 safestrncpy(tracefile, optarg, sizeof tracefile);
495 freopen(tracefile, "w", stdout);
496 freopen(tracefile, "w", stderr);
497 freopen(tracefile, "r", stdin);
500 verbosity = atoi(optarg);
506 server_cookie = malloc(256);
507 if (server_cookie != NULL) {
508 safestrncpy(server_cookie,
509 "Set-cookie: wcserver=",
512 (&server_cookie[strlen(server_cookie)],
514 lprintf(2, "gethostname: %s\n",
524 fprintf(stderr, "usage: webserver "
525 "[-i ip_addr] [-p http_port] "
526 "[-t tracefile] [-c] [-f] "
530 "[remotehost [remoteport]]\n");
535 ctdlhost = argv[optind];
537 ctdlport = argv[optind];
539 /** Tell 'em who's in da house */
540 lprintf(1, SERVER "\n");
541 lprintf(1, "Copyright (C) 1996-2005 by the Citadel development team.\n"
542 "This software is distributed under the terms of the "
543 "GNU General Public License.\n\n"
546 lprintf(9, "Changing directory to %s\n", webcitdir);
547 if (chdir(webcitdir) != 0) {
551 /** initialize the International Bright Young Thing */
554 initialize_locales();
556 locale = setlocale(LC_ALL, "");
558 mo = malloc(strlen(webcitdir) + 20);
559 sprintf(mo, "%s/locale", webcitdir);
560 lprintf(9, "Message catalog directory: %s\n",
561 bindtextdomain("webcit", mo)
564 lprintf(9, "Text domain: %s\n",
567 lprintf(9, "Text domain Charset: %s\n",
568 bind_textdomain_codeset("webcit","UTF8")
572 initialize_viewdefs();
576 * Set up a place to put thread-specific data.
577 * We only need a single pointer per thread - it points to the
578 * wcsession struct to which the thread is currently bound.
580 if (pthread_key_create(&MyConKey, NULL) != 0) {
581 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
585 * Set up a place to put thread-specific SSL data.
586 * We don't stick this in the wcsession struct because SSL starts
587 * up before the session is bound, and it gets torn down between
591 if (pthread_key_create(&ThreadSSL, NULL) != 0) {
592 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
597 * Bind the server to our favorite port.
598 * There is no need to check for errors, because ig_tcp_server()
599 * exits if it doesn't succeed.
602 if (strlen(uds_listen_path) > 0) {
603 lprintf(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
604 msock = ig_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
607 lprintf(2, "Attempting to bind to port %d...\n", port);
608 msock = ig_tcp_server(ip_addr, port, LISTEN_QUEUE_LENGTH);
611 lprintf(2, "Listening on socket %d\n", msock);
612 signal(SIGPIPE, SIG_IGN);
614 pthread_mutex_init(&SessionListMutex, NULL);
617 * Start up the housekeeping thread
619 pthread_attr_init(&attr);
620 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
621 pthread_create(&SessThread, &attr,
622 (void *(*)(void *)) housekeeping_loop, NULL);
626 * If this is an HTTPS server, fire up SSL
634 /** Start a few initial worker threads */
635 for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
636 spawn_another_worker_thread();
639 /* now the original thread becomes another worker */
646 * Entry point for worker threads
648 void worker_entry(void)
653 int fail_this_transaction = 0;
656 /** Only one thread can accept at a time */
657 fail_this_transaction = 0;
658 ssock = accept(msock, NULL, 0);
660 lprintf(2, "accept() failed: %s\n",
663 /** Set the SO_REUSEADDR socket option */
665 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
668 /** If we are an HTTPS server, go crypto now. */
671 if (starttls(ssock) != 0) {
672 fail_this_transaction = 1;
678 if (fail_this_transaction == 0) {
679 /** Perform an HTTP transaction... */
681 /** ...and close the socket. */
682 lingering_close(ssock);
687 } while (!time_to_die);
693 * \brief logprintf. log messages
694 * logs to stderr if loglevel is lower than the verbosity set at startup
695 * \param loglevel level of the message
696 * \param format the printf like format string
697 * \param ... the strings to put into format
699 int lprintf(int loglevel, const char *format, ...)
703 if (loglevel <= verbosity) {
704 va_start(ap, format);
705 vfprintf(stderr, format, ap);