2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file server.c Paraslash's main server */
22 /** \mainpage Paraslash API Reference
24 * Good starting points for reading are probably \ref audio_file_selector,
25 * \ref sender, \ref receiver, \ref receiver_node, \ref filter, \ref
32 #include "server.cmdline.h"
37 #include "close_on_fork.h"
46 /** define the array of error lists needed by para_server */
49 /** shut down non-authorized connections after that many seconds */
50 #define ALARM_TIMEOUT 10
52 /* these are exported to afs.c. command.c and to all selectors */
53 struct misc_meta_data *mmd;
54 /** the configuration of para_server
56 * It also contains the options for all audio file selectors and all supported
59 struct gengetopt_args_info conf;
60 char *user_list = NULL;
61 extern void dccp_send_init(struct sender *);
62 extern void http_send_init(struct sender *);
63 extern void ortp_send_init(struct sender *);
64 extern struct audio_format afl[];
66 /* TODO: This is better handled by autoconf */
67 /** the list of supported audio file selectors */
68 struct audio_file_selector selectors[] = {
71 .init = random_selector_init,
72 .update_audio_file = NULL,
76 .init = playlist_selector_init,
77 .update_audio_file = NULL,
84 .init = mysql_selector_init,
85 .update_audio_file = NULL,
95 /** the list of supported senders */
96 struct sender senders[] = {
99 .init = http_send_init,
103 .init = dccp_send_init,
108 .init = ortp_send_init,
117 /* global variables for server-internal use */
118 static FILE *logfile;
119 static int mmd_mutex, mmd_shm_id;
120 static int signal_pipe;
123 * para_server's log function
125 * \param ll the log level
126 * \param fmt the format string describing the log message
128 void para_log(int ll, const char* fmt,...)
134 char str[MAXLINE] = "";
137 if (ll < conf.loglevel_arg)
139 outfd = logfile? logfile : stderr;
142 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
143 fprintf(outfd, "%s ", str);
144 if (conf.loglevel_arg <= INFO)
145 fprintf(outfd, "%i: ", ll);
147 if (conf.loglevel_arg <= INFO)
148 fprintf(outfd, "(%d) ", mypid);
150 vfprintf(outfd, fmt, argp);
155 * setup shared memory area and get mutex for locking
157 static void shm_init(void)
160 int ret = shm_new(sizeof(struct misc_meta_data));
165 ret = shm_attach(ret, ATTACH_RW, &shm);
176 mmd->selector_num = 0;
178 mmd->num_commands = 0;
180 mmd->num_connects = 0;
181 mmd->active_connections = 0;
182 strcpy(mmd->filename, "(none)");
183 mmd->audio_format = -1;
184 mmd->afs_status_flags = AFS_NEXT;
185 mmd->new_afs_status_flags = AFS_NEXT;
186 mmd->sender_cmd_data.cmd_num = -1;
189 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
194 * lock the shared memory area containing the mmd struct
196 * \sa semop(2), struct misc_meta_data
200 mutex_lock(mmd_mutex);
204 * unlock the shared memory area containing the mmd struct
206 * \sa semop(2), struct misc_meta_data
209 void mmd_unlock(void)
211 mutex_unlock(mmd_mutex);
214 static void parse_config(int override)
216 char *home = para_homedir();
221 if (conf.config_file_given)
222 cf = conf.config_file_arg;
224 cf = make_message("%s/.paraslash/server.conf", home);
226 if (!conf.user_list_given)
227 user_list = make_message("%s/.paraslash/server.users", home);
229 user_list = para_strdup(conf.user_list_arg);
230 ret = stat(cf, &statbuf);
231 if (ret && conf.config_file_given) {
233 PARA_EMERG_LOG("can not stat config file %s\n", cf);
237 int tmp = conf.daemon_given;
238 cmdline_parser_configfile(cf, &conf, override, 0, 0);
239 conf.daemon_given = tmp;
242 if (!conf.logfile_given && conf.daemon_given) {
244 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
247 if (conf.logfile_given)
248 logfile = open_log(conf.logfile_arg);
260 static void setup_signal_handling(void)
264 signal_pipe = para_signal_init();
265 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
266 ret += para_install_sighandler(SIGINT);
267 ret += para_install_sighandler(SIGTERM);
268 ret += para_install_sighandler(SIGHUP);
269 ret += para_install_sighandler(SIGCHLD);
270 ret += para_install_sighandler(SIGUSR1);
271 signal(SIGPIPE, SIG_IGN);
273 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
278 static void init_selector(void)
282 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
283 if (!conf.selector_given)
285 for (i = 0; selectors[i].name; i++) {
286 if (strcmp(selectors[i].name, conf.selector_arg))
288 PARA_NOTICE_LOG("initializing %s audio file selector\n",
290 ret = selectors[i].init(&selectors[i]);
292 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
295 mmd->selector_num = i;
298 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
300 mmd->selector_num = 0;
301 selectors[0].init(&selectors[0]); /* always successful */
304 static unsigned init_network(void)
306 int sockfd = init_tcp_socket(conf.port_arg);
313 static void init_random_seed(void)
315 int fd, ret = -1, len = sizeof(unsigned int);
318 fd = open("/dev/urandom", O_RDONLY);
322 if (read(fd, &seed, len) != len)
331 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
336 static unsigned do_inits(int argc, char **argv)
338 /* connector's address information */
342 /* parse command line options */
343 cmdline_parser(argc, argv, &conf);
344 para_drop_privileges(conf.user_arg, conf.group_arg);
345 /* parse config file, open log and set defaults */
347 log_welcome("para_server", conf.loglevel_arg);
348 shm_init(); /* init mmd struct */
349 server_uptime(UPTIME_SET); /* reset server uptime */
351 if (conf.daemon_given)
354 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
355 /* audio file sender */
357 mmd->server_pid = getpid();
358 setup_signal_handling();
360 /* init network socket */
361 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
362 sockfd = init_network();
363 if (conf.autoplay_given) {
364 mmd->afs_status_flags |= AFS_PLAYING;
365 mmd->new_afs_status_flags |= AFS_PLAYING;
367 PARA_NOTICE_LOG("%s", "init complete\n");
371 static void change_selector(void)
373 int ret, old = mmd->selector_num, new = mmd->selector_change;
375 selectors[old].shutdown();
376 ret = selectors[new].init(&selectors[new]);
377 mmd->selector_change = -1; /* reset */
379 mmd->selector_num = new;
383 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
384 selectors[0].init(&selectors[0]);
385 mmd->selector_num = 0;
389 * called when server gets SIGHUP or when client invokes hup command.
391 static void handle_sighup(void)
393 PARA_NOTICE_LOG("%s", "SIGHUP\n");
394 close_log(logfile); /* gets reopened if necessary by parse_config */
396 parse_config(1); /* reopens log */
397 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
398 change_selector(); /* .. just reload */
401 static void status_refresh(void)
403 static int prev_uptime = -1, prev_events = -1;
404 int uptime = server_uptime(UPTIME_GET), ret = 1;
406 if (prev_events != mmd->events)
408 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
410 if (uptime / 60 != prev_uptime / 60)
414 prev_uptime = uptime;
415 prev_events = mmd->events;
416 mmd->afs_status_flags = mmd->new_afs_status_flags;
418 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
419 mmd->events, mmd->audio_format);
427 int main(int argc, char *argv[])
429 /* listen on sock_fd, new connection on new_fd */
431 struct sockaddr_in their_addr;
432 int i, max_fileno, ret;
435 struct timeval *timeout;
438 sockfd = do_inits(argc, argv);
443 /* check socket and signal pipe in any case */
444 para_fd_set(sockfd, &rfds, &max_fileno);
445 para_fd_set(signal_pipe, &rfds, &max_fileno);
446 timeout = afs_preselect();
448 for (i = 0; senders[i].name; i++) {
449 if (senders[i].status != SENDER_ON)
451 if (!senders[i].pre_select)
453 senders[i].pre_select(mmd->audio_format >= 0?
454 &afl[mmd->audio_format] : NULL,
458 if (selectors[mmd->selector_num].pre_select) {
459 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
460 max_fileno = PARA_MAX(max_fileno, ret);
463 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
465 if (mmd->selector_change >= 0)
467 if (selectors[mmd->selector_num].post_select)
468 selectors[mmd->selector_num].post_select(&rfds, &wfds);
471 for (i = 0; senders[i].name; i++) {
472 if (senders[i].status != SENDER_ON)
474 if (!senders[i].post_select)
476 senders[i].post_select(mmd->audio_format >= 0?
477 &afl[mmd->audio_format] : NULL,
482 if (FD_ISSET(signal_pipe, &rfds)) {
484 sig = para_next_signal();
490 para_reap_children();
492 /* die on sigint/sigterm. Kill all children too. */
495 PARA_EMERG_LOG("terminating on signal %d\n", sig);
497 selectors[mmd->selector_num].shutdown();
498 mutex_destroy(mmd_mutex);
500 shm_destroy(mmd_shm_id);
504 if (mmd->sender_cmd_data.cmd_num >= 0) {
505 int num = mmd->sender_cmd_data.cmd_num,
506 s = mmd->sender_cmd_data.sender_num;
508 if (senders[s].client_cmds[num])
509 senders[s].client_cmds[num](&mmd->sender_cmd_data);
510 mmd->sender_cmd_data.cmd_num = -1;
512 if (!FD_ISSET(sockfd, &rfds))
515 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
518 PARA_INFO_LOG("got connection from %s, forking\n",
519 inet_ntoa(their_addr.sin_addr));
521 mmd->active_connections++;
525 PARA_CRIT_LOG("%s", "fork failed\n");
530 /* parent keeps accepting connections */
533 alarm(ALARM_TIMEOUT);
535 close(sockfd); /* child doesn't need the listener */
537 * put info on who we are serving into argv[0] to make
538 * client ip visible in top/ps
540 for (i = argc - 1; i >= 0; i--)
541 memset(argv[i], 0, strlen(argv[i]));
542 sprintf(argv[0], "para_server (serving %s)",
543 inet_ntoa(their_addr.sin_addr));
544 return handle_connect(new_fd, &their_addr);