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 *);
65 /* TODO: This is better handled by autoconf */
66 /** the list of supported audio file selectors */
67 struct audio_file_selector selectors[] = {
70 .init = random_selector_init,
71 .update_audio_file = NULL,
75 .init = playlist_selector_init,
76 .update_audio_file = NULL,
83 .init = mysql_selector_init,
84 .update_audio_file = NULL,
94 /** the list of supported senders */
95 struct sender senders[] = {
98 .init = http_send_init,
102 .init = dccp_send_init,
107 .init = ortp_send_init,
116 /* global variables for server-internal use */
117 static FILE *logfile;
118 static int mmd_mutex, mmd_shm_id;
119 static int signal_pipe;
122 * para_server's log function
124 * \param ll the log level
125 * \param fmt the format string describing the log message
127 void para_log(int ll, const char* fmt,...)
133 char str[MAXLINE] = "";
136 if (ll < conf.loglevel_arg)
138 outfd = logfile? logfile : stderr;
141 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
142 fprintf(outfd, "%s ", str);
143 if (conf.loglevel_arg <= INFO)
144 fprintf(outfd, "%i: ", ll);
146 if (conf.loglevel_arg <= INFO)
147 fprintf(outfd, "(%d) ", mypid);
149 vfprintf(outfd, fmt, argp);
154 * setup shared memory area and get mutex for locking
156 static void shm_init(void)
159 int ret = shm_new(sizeof(struct misc_meta_data));
164 ret = shm_attach(ret, ATTACH_RW, &shm);
175 mmd->selector_num = 0;
177 mmd->num_commands = 0;
179 mmd->num_connects = 0;
180 mmd->active_connections = 0;
181 strcpy(mmd->filename, "(none)");
182 mmd->audio_format = -1;
183 mmd->afs_status_flags = AFS_NEXT;
184 mmd->new_afs_status_flags = AFS_NEXT;
185 mmd->sender_cmd_data.cmd_num = -1;
188 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
193 * lock the shared memory area containing the mmd struct
195 * \sa semop(2), struct misc_meta_data
199 mutex_lock(mmd_mutex);
203 * unlock the shared memory area containing the mmd struct
205 * \sa semop(2), struct misc_meta_data
208 void mmd_unlock(void)
210 mutex_unlock(mmd_mutex);
213 static void parse_config(int override)
215 char *home = para_homedir();
220 if (conf.config_file_given)
221 cf = conf.config_file_arg;
223 cf = make_message("%s/.paraslash/server.conf", home);
225 if (!conf.user_list_given)
226 user_list = make_message("%s/.paraslash/server.users", home);
228 user_list = para_strdup(conf.user_list_arg);
229 ret = stat(cf, &statbuf);
230 if (ret && conf.config_file_given) {
232 PARA_EMERG_LOG("can not stat config file %s\n", cf);
236 int tmp = conf.daemon_given;
237 cmdline_parser_configfile(cf, &conf, override, 0, 0);
238 conf.daemon_given = tmp;
241 if (!conf.logfile_given && conf.daemon_given) {
243 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
246 if (conf.logfile_given)
247 logfile = open_log(conf.logfile_arg);
259 static void setup_signal_handling(void)
263 signal_pipe = para_signal_init();
264 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
265 ret += para_install_sighandler(SIGINT);
266 ret += para_install_sighandler(SIGTERM);
267 ret += para_install_sighandler(SIGHUP);
268 ret += para_install_sighandler(SIGCHLD);
269 ret += para_install_sighandler(SIGUSR1);
270 signal(SIGPIPE, SIG_IGN);
272 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
277 static void init_selector(void)
281 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
282 if (!conf.selector_given)
284 for (i = 0; selectors[i].name; i++) {
285 if (strcmp(selectors[i].name, conf.selector_arg))
287 PARA_NOTICE_LOG("initializing %s audio file selector\n",
289 ret = selectors[i].init(&selectors[i]);
291 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
294 mmd->selector_num = i;
297 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
299 mmd->selector_num = 0;
300 selectors[0].init(&selectors[0]); /* always successful */
303 static unsigned init_network(void)
305 int sockfd = init_tcp_socket(conf.port_arg);
312 static void init_random_seed(void)
314 int fd, ret = -1, len = sizeof(unsigned int);
317 fd = open("/dev/urandom", O_RDONLY);
321 if (read(fd, &seed, len) != len)
330 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
335 static unsigned do_inits(int argc, char **argv)
337 /* connector's address information */
341 /* parse command line options */
342 cmdline_parser(argc, argv, &conf);
343 para_drop_privileges(conf.user_arg, conf.group_arg);
344 /* parse config file, open log and set defaults */
346 log_welcome("para_server", conf.loglevel_arg);
347 shm_init(); /* init mmd struct */
348 server_uptime(UPTIME_SET); /* reset server uptime */
350 if (conf.daemon_given)
353 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
354 /* audio file sender */
356 mmd->server_pid = getpid();
357 setup_signal_handling();
359 /* init network socket */
360 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
361 sockfd = init_network();
362 if (conf.autoplay_given) {
363 mmd->afs_status_flags |= AFS_PLAYING;
364 mmd->new_afs_status_flags |= AFS_PLAYING;
366 PARA_NOTICE_LOG("%s", "init complete\n");
370 static void change_selector(void)
372 int ret, old = mmd->selector_num, new = mmd->selector_change;
374 selectors[old].shutdown();
375 ret = selectors[new].init(&selectors[new]);
376 mmd->selector_change = -1; /* reset */
378 mmd->selector_num = new;
382 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
383 selectors[0].init(&selectors[0]);
384 mmd->selector_num = 0;
388 * called when server gets SIGHUP or when client invokes hup command.
390 static void handle_sighup(void)
392 PARA_NOTICE_LOG("%s", "SIGHUP\n");
393 close_log(logfile); /* gets reopened if necessary by parse_config */
395 parse_config(1); /* reopens log */
396 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
397 change_selector(); /* .. just reload */
400 static void status_refresh(void)
402 static int prev_uptime = -1, prev_events = -1;
403 int uptime = server_uptime(UPTIME_GET), ret = 1;
405 if (prev_events != mmd->events)
407 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
409 if (uptime / 60 != prev_uptime / 60)
413 prev_uptime = uptime;
414 prev_events = mmd->events;
415 mmd->afs_status_flags = mmd->new_afs_status_flags;
417 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
418 mmd->events, mmd->audio_format);
426 int main(int argc, char *argv[])
428 /* listen on sock_fd, new connection on new_fd */
430 struct sockaddr_in their_addr;
431 int i, max_fileno, ret;
434 struct timeval *timeout;
437 sockfd = do_inits(argc, argv);
442 /* check socket and signal pipe in any case */
443 para_fd_set(sockfd, &rfds, &max_fileno);
444 para_fd_set(signal_pipe, &rfds, &max_fileno);
445 timeout = afs_preselect();
447 for (i = 0; senders[i].name; i++) {
448 if (senders[i].status != SENDER_ON)
450 if (!senders[i].pre_select)
452 senders[i].pre_select( &max_fileno, &rfds, &wfds);
454 if (selectors[mmd->selector_num].pre_select) {
455 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
456 max_fileno = PARA_MAX(max_fileno, ret);
459 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
461 if (mmd->selector_change >= 0)
463 if (selectors[mmd->selector_num].post_select)
464 selectors[mmd->selector_num].post_select(&rfds, &wfds);
467 for (i = 0; senders[i].name; i++) {
468 if (senders[i].status != SENDER_ON)
470 if (!senders[i].post_select)
472 senders[i].post_select(&rfds, &wfds);
476 if (FD_ISSET(signal_pipe, &rfds)) {
478 sig = para_next_signal();
484 para_reap_children();
486 /* die on sigint/sigterm. Kill all children too. */
489 PARA_EMERG_LOG("terminating on signal %d\n", sig);
491 selectors[mmd->selector_num].shutdown();
492 mutex_destroy(mmd_mutex);
494 shm_destroy(mmd_shm_id);
498 if (mmd->sender_cmd_data.cmd_num >= 0) {
499 int num = mmd->sender_cmd_data.cmd_num,
500 s = mmd->sender_cmd_data.sender_num;
502 if (senders[s].client_cmds[num])
503 senders[s].client_cmds[num](&mmd->sender_cmd_data);
504 mmd->sender_cmd_data.cmd_num = -1;
506 if (!FD_ISSET(sockfd, &rfds))
509 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
512 PARA_INFO_LOG("got connection from %s, forking\n",
513 inet_ntoa(their_addr.sin_addr));
515 mmd->active_connections++;
519 PARA_CRIT_LOG("%s", "fork failed\n");
524 /* parent keeps accepting connections */
527 alarm(ALARM_TIMEOUT);
529 close(sockfd); /* child doesn't need the listener */
531 * put info on who we are serving into argv[0] to make
532 * client ip visible in top/ps
534 for (i = argc - 1; i >= 0; i--)
535 memset(argv[i], 0, strlen(argv[i]));
536 sprintf(argv[0], "para_server (serving %s)",
537 inet_ntoa(their_addr.sin_addr));
538 return handle_connect(new_fd, &their_addr);