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"
45 /** define the array of error lists needed by para_server */
48 /** shut down non-authorized connections after that many seconds */
49 #define ALARM_TIMEOUT 10
51 /* these are exported to afs.c. command.c and to all selectors */
52 struct misc_meta_data *mmd;
53 /** the configuration of para_server
55 * It also contains the options for all audio file selectors and all supported
58 struct gengetopt_args_info conf;
59 char *user_list = NULL;
60 extern void http_send_init(struct sender *);
61 extern void ortp_send_init(struct sender *);
62 extern struct audio_format afl[];
64 /** the list of supported audio file selectors */
65 struct audio_file_selector dblist[] = {
68 .init = random_selector_init,
69 .update_audio_file = NULL,
73 .init = playlist_selector_init,
74 .update_audio_file = NULL,
81 .init = mysql_selector_init,
82 .update_audio_file = NULL,
92 /** the list of supported senders */
93 struct sender senders[] = {
96 .init = http_send_init,
101 .init = ortp_send_init,
110 /* global variables for server-internal use */
111 static FILE *logfile;
112 static int mmd_mutex, mmd_shm_id;
113 static int signal_pipe;
116 * para_server's log function
118 * \param ll the log level
119 * \param fmt the format string describing the log message
121 void para_log(int ll, char* fmt,...)
127 char str[MAXLINE] = "";
130 if (ll < conf.loglevel_arg)
139 if (conf.daemon_given && !logfile)
143 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
144 fprintf(outfd, "%s ", str);
145 if (conf.loglevel_arg <= INFO)
146 fprintf(outfd, "%i: ", ll);
148 if (conf.loglevel_arg <= INFO)
149 fprintf(outfd, "(%d) ", mypid);
151 vfprintf(outfd, fmt, argp);
156 * setup shared memory area and get mutex for locking
158 static void shm_init(void)
161 int ret = shm_new(sizeof(struct misc_meta_data));
166 ret = shm_attach(ret, ATTACH_RW, &shm);
179 mmd->num_commands = 0;
181 mmd->num_connects = 0;
182 mmd->active_connections = 0;
183 strcpy(mmd->filename, "(none)");
184 mmd->audio_format = -1;
185 mmd->afs_status_flags = AFS_NEXT;
186 mmd->new_afs_status_flags = AFS_NEXT;
187 mmd->sender_cmd_data.cmd_num = -1;
190 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
195 * lock the shared memory area containing the mmd struct
197 * \sa semop(2), struct misc_meta_data
201 mutex_lock(mmd_mutex);
205 * unlock the shared memory area containing the mmd struct
207 * \sa semop(2), struct misc_meta_data
210 void mmd_unlock(void)
212 mutex_unlock(mmd_mutex);
215 static void parse_config(int override)
217 char *home = para_homedir();
222 if (conf.config_file_given)
223 cf = conf.config_file_arg;
225 cf = make_message("%s/.paraslash/server.conf", home);
227 if (!conf.user_list_given)
228 user_list = make_message("%s/.paraslash/server.users", home);
230 user_list = para_strdup(conf.user_list_arg);
231 ret = stat(cf, &statbuf);
232 if (ret && conf.config_file_given) {
234 PARA_EMERG_LOG("can not stat config file %s\n", cf);
238 int tmp = conf.daemon_given;
239 cmdline_parser_configfile(cf, &conf, override, 0, 0);
240 conf.daemon_given = tmp;
243 if (!conf.logfile_given && conf.daemon_given) {
245 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
248 if (conf.logfile_given)
249 logfile = open_log(conf.logfile_arg);
261 static void setup_signal_handling(void)
265 signal_pipe = para_signal_init();
266 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
267 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
268 ret += para_install_sighandler(SIGINT);
269 ret += para_install_sighandler(SIGTERM);
270 ret += para_install_sighandler(SIGHUP);
271 ret += para_install_sighandler(SIGCHLD);
272 ret += para_install_sighandler(SIGUSR1);
273 signal(SIGPIPE, SIG_IGN);
275 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
280 static void init_selector(void)
284 mmd->dbt_change = -1; /* no change nec., set to new dbt num by com_cdt */
285 if (!conf.selector_given)
287 for (i = 0; dblist[i].name; i++) {
288 if (strcmp(dblist[i].name, conf.selector_arg))
290 PARA_NOTICE_LOG("initializing %s audio file selector\n",
292 ret = dblist[i].init(&dblist[i]);
294 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
300 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
303 dblist[0].init(&dblist[0]); /* always successful */
306 static unsigned init_network(void)
308 int sockfd = init_tcp_socket(conf.port_arg);
315 static void init_random_seed(void)
317 int fd, ret = -1, len = sizeof(unsigned int);
320 fd = open("/dev/random", O_RDONLY);
324 if (read(fd, &seed, len) != len)
333 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
338 static unsigned do_inits(int argc, char **argv)
340 /* connector's address information */
344 /* parse command line options */
345 cmdline_parser(argc, argv, &conf);
346 para_drop_privileges(conf.user_arg);
347 /* parse config file, open log and set defaults */
349 log_welcome("para_server", conf.loglevel_arg);
350 shm_init(); /* init mmd struct */
351 server_uptime(UPTIME_SET); /* reset server uptime */
353 if (conf.daemon_given)
356 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
357 /* audio file sender */
359 mmd->server_pid = getpid();
360 setup_signal_handling();
362 /* init network socket */
363 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
364 sockfd = init_network();
365 if (conf.autoplay_given) {
366 mmd->afs_status_flags |= AFS_PLAYING;
367 mmd->new_afs_status_flags |= AFS_PLAYING;
369 PARA_NOTICE_LOG("%s", "init complete\n");
373 static void handle_dbt_change(void)
375 int ret, old = mmd->dbt_num, new = mmd->dbt_change;
377 dblist[old].shutdown();
378 ret = dblist[new].init(&dblist[new]);
379 mmd->dbt_change = -1; /* reset */
385 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
386 dblist[0].init(&dblist[0]);
391 * called when server gets SIGHUP or when client invokes hup command.
393 static void handle_sighup(void)
395 PARA_NOTICE_LOG("%s", "SIGHUP\n");
396 close_log(logfile); /* gets reopened if necessary by parse_config */
398 parse_config(1); /* reopens log */
399 mmd->dbt_change = mmd->dbt_num; /* do not change selector */
400 handle_dbt_change(); /* reload selector */
403 static void status_refresh(void)
405 static int prev_uptime = -1, prev_events = -1;
406 int uptime = server_uptime(UPTIME_GET), ret = 1;
408 if (prev_events != mmd->events)
410 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
412 if (uptime / 60 != prev_uptime / 60)
416 prev_uptime = uptime;
417 prev_events = mmd->events;
418 mmd->afs_status_flags = mmd->new_afs_status_flags;
420 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
421 mmd->events, mmd->audio_format);
429 int main(int argc, char *argv[])
431 /* listen on sock_fd, new connection on new_fd */
433 struct sockaddr_in their_addr;
434 int err, i, max_fileno, ret;
437 struct timeval *timeout;
440 sockfd = do_inits(argc, argv);
442 /* check socket and signal pipe in any case */
445 FD_SET(sockfd, &rfds);
447 FD_SET(signal_pipe, &rfds);
448 max_fileno = MAX(max_fileno, signal_pipe);
450 timeout = afs_preselect();
452 for (i = 0; senders[i].name; i++) {
453 if (senders[i].status != SENDER_ON)
455 if (!senders[i].pre_select)
457 senders[i].pre_select(mmd->audio_format >= 0?
458 &afl[mmd->audio_format] : NULL,
462 if (dblist[mmd->dbt_num].pre_select) {
463 ret = dblist[mmd->dbt_num].pre_select(&rfds, &wfds);
464 max_fileno = MAX(max_fileno, ret);
467 // PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
468 ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);
470 //PARA_DEBUG_LOG("%s: select returned %i\n", __func__, ret);
472 if (mmd->dbt_change >= 0)
474 if (dblist[mmd->dbt_num].post_select)
475 dblist[mmd->dbt_num].post_select(&rfds, &wfds);
476 if (ret < 0 && err == EINTR)
479 PARA_CRIT_LOG("select error (%s)\n", strerror(err));
482 for (i = 0; senders[i].name; i++) {
483 if (senders[i].status != SENDER_ON)
485 if (!senders[i].post_select)
487 senders[i].post_select(mmd->audio_format >= 0?
488 &afl[mmd->audio_format] : NULL,
495 if (FD_ISSET(signal_pipe, &rfds)) {
497 sig = para_next_signal();
503 para_reap_children();
505 /* die on sigint/sigterm. Kill all children too. */
508 PARA_EMERG_LOG("terminating on signal %d\n", sig);
510 dblist[mmd->dbt_num].shutdown();
511 mutex_destroy(mmd_mutex);
513 shm_destroy(mmd_shm_id);
517 if (mmd->sender_cmd_data.cmd_num >= 0) {
518 int num = mmd->sender_cmd_data.cmd_num,
519 s = mmd->sender_cmd_data.sender_num;
521 if (senders[s].client_cmds[num])
522 senders[s].client_cmds[num](&mmd->sender_cmd_data);
523 mmd->sender_cmd_data.cmd_num = -1;
525 if (!FD_ISSET(sockfd, &rfds))
528 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
531 PARA_INFO_LOG("got connection from %s, forking\n",
532 inet_ntoa(their_addr.sin_addr));
534 mmd->active_connections++;
538 PARA_CRIT_LOG("%s", "fork failed\n");
543 /* parent keeps accepting connections */
546 alarm(ALARM_TIMEOUT);
548 close(sockfd); /* child doesn't need the listener */
550 * put info on who we are serving into argv[0] to make
551 * client ip visible in top/ps
553 for (i = argc - 1; i >= 0; i--)
554 memset(argv[i], 0, strlen(argv[i]));
555 sprintf(argv[0], "para_server (serving %s)",
556 inet_ntoa(their_addr.sin_addr));
557 return handle_connect(new_fd, &their_addr);