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 dbtool, \ref sender,
25 * \ref receiver, \ref receiver_node, \ref filter, \ref filter_node.
31 #include "server.cmdline.h"
36 #include "close_on_fork.h"
44 /** define the array of error lists needed by para_server */
47 /** shut down non-authorized connections after that many seconds */
48 #define ALARM_TIMEOUT 10
50 /* these are exported to afs/command/dbtool */
51 struct misc_meta_data *mmd;
52 /** the configuration of para_server
54 * It also contains the options for all database tools and all supported
57 struct gengetopt_args_info conf;
58 char *user_list = NULL;
59 extern void http_send_init(struct sender *);
60 extern void ortp_send_init(struct sender *);
61 extern struct audio_format afl[];
63 /** the list of supported database tools */
64 struct dbtool dblist[] = {
67 .init = random_dbtool_init,
68 .update_audio_file = NULL,
72 .init = plm_dbtool_init,
73 .update_audio_file = NULL,
80 .init = mysql_dbtool_init,
81 .update_audio_file = NULL,
91 /** the list of supported senders */
92 struct sender senders[] = {
95 .init = http_send_init,
100 .init = ortp_send_init,
109 /* global variables for server-internal use */
110 static FILE *logfile;
111 static int mmd_mutex, mmd_shm_id;
112 static int signal_pipe;
115 * para_server's log function
117 * \param ll the log level
118 * \param fmt the format string describing the log message
120 void para_log(int ll, char* fmt,...)
126 char str[MAXLINE] = "";
129 if (ll < conf.loglevel_arg)
138 if (conf.daemon_given && !logfile)
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);
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 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
266 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
267 ret += para_install_sighandler(SIGINT);
268 ret += para_install_sighandler(SIGTERM);
269 ret += para_install_sighandler(SIGHUP);
270 ret += para_install_sighandler(SIGCHLD);
271 ret += para_install_sighandler(SIGUSR1);
272 signal(SIGPIPE, SIG_IGN);
274 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
279 static void init_dbtool(void)
283 mmd->dbt_change = -1; /* no change nec., set to new dbt num by com_cdt */
284 if (!conf.dbtool_given)
286 for (i = 0; dblist[i].name; i++) {
287 if (strcmp(dblist[i].name, conf.dbtool_arg))
289 PARA_NOTICE_LOG("initializing %s database tool\n",
291 ret = dblist[i].init(&dblist[i]);
293 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
299 PARA_WARNING_LOG("%s", "falling back to the random dbtool\n");
302 dblist[0].init(&dblist[0]); /* always successful */
305 static unsigned init_network(void)
307 int sockfd = init_tcp_socket(conf.port_arg);
314 static void init_random_seed(void)
316 int fd, ret = -1, len = sizeof(unsigned int);
319 fd = open("/dev/random", O_RDONLY);
323 if (read(fd, &seed, len) != len)
332 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
337 static unsigned do_inits(int argc, char **argv)
339 /* connector's address information */
343 /* parse command line options */
344 cmdline_parser(argc, argv, &conf);
345 para_drop_privileges(conf.user_arg);
346 /* parse config file, open log and set defaults */
348 log_welcome("para_server", conf.loglevel_arg);
349 shm_init(); /* init mmd struct */
350 server_uptime(UPTIME_SET); /* reset server uptime */
352 if (conf.daemon_given)
355 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
356 /* audio file sender */
358 mmd->server_pid = getpid();
359 setup_signal_handling();
361 /* init network socket */
362 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
363 sockfd = init_network();
364 if (conf.autoplay_given) {
365 mmd->afs_status_flags |= AFS_PLAYING;
366 mmd->new_afs_status_flags |= AFS_PLAYING;
368 PARA_NOTICE_LOG("%s", "init complete\n");
372 static void handle_dbt_change(void)
374 int ret, old = mmd->dbt_num, new = mmd->dbt_change;
376 dblist[old].shutdown();
377 ret = dblist[new].init(&dblist[new]);
378 mmd->dbt_change = -1; /* reset */
384 PARA_ERROR_LOG("%s -- switching to the random dbtool\n", PARA_STRERROR(-ret));
385 dblist[0].init(&dblist[0]);
390 * called when server gets SIGHUP or when client invokes hup command.
392 static void handle_sighup(void)
394 PARA_NOTICE_LOG("%s", "SIGHUP\n");
395 close_log(logfile); /* gets reopened if necessary by parse_config */
397 parse_config(1); /* reopens log */
398 mmd->dbt_change = mmd->dbt_num; /* do not change dbtool */
399 handle_dbt_change(); /* force reloading dbtool */
402 static void status_refresh(void)
404 static int prev_uptime = -1, prev_events = -1;
405 int uptime = server_uptime(UPTIME_GET), ret = 1;
407 if (prev_events != mmd->events)
409 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
411 if (uptime / 60 != prev_uptime / 60)
415 prev_uptime = uptime;
416 prev_events = mmd->events;
417 mmd->afs_status_flags = mmd->new_afs_status_flags;
419 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
420 mmd->events, mmd->audio_format);
428 int main(int argc, char *argv[])
430 /* listen on sock_fd, new connection on new_fd */
432 struct sockaddr_in their_addr;
433 int err, i, max_fileno, ret;
436 struct timeval *timeout;
439 sockfd = do_inits(argc, argv);
441 /* check socket and signal pipe in any case */
444 FD_SET(sockfd, &rfds);
446 FD_SET(signal_pipe, &rfds);
447 max_fileno = MAX(max_fileno, signal_pipe);
449 timeout = afs_preselect();
451 for (i = 0; senders[i].name; i++) {
452 if (senders[i].status != SENDER_ON)
454 if (!senders[i].pre_select)
456 senders[i].pre_select(mmd->audio_format >= 0?
457 &afl[mmd->audio_format] : NULL,
461 if (dblist[mmd->dbt_num].pre_select) {
462 ret = dblist[mmd->dbt_num].pre_select(&rfds, &wfds);
463 max_fileno = MAX(max_fileno, ret);
466 // PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
467 ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);
469 //PARA_DEBUG_LOG("%s: select returned %i\n", __func__, ret);
471 if (mmd->dbt_change >= 0)
473 if (dblist[mmd->dbt_num].post_select)
474 dblist[mmd->dbt_num].post_select(&rfds, &wfds);
475 if (ret < 0 && err == EINTR)
478 PARA_CRIT_LOG("select error (%s)\n", strerror(err));
481 for (i = 0; senders[i].name; i++) {
482 if (senders[i].status != SENDER_ON)
484 if (!senders[i].post_select)
486 senders[i].post_select(mmd->audio_format >= 0?
487 &afl[mmd->audio_format] : NULL,
494 if (FD_ISSET(signal_pipe, &rfds)) {
496 sig = para_next_signal();
502 para_reap_children();
504 /* die on sigint/sigterm. Kill all children too. */
507 PARA_EMERG_LOG("terminating on signal %d\n", sig);
509 dblist[mmd->dbt_num].shutdown();
510 mutex_destroy(mmd_mutex);
512 shm_destroy(mmd_shm_id);
516 if (mmd->sender_cmd_data.cmd_num >= 0) {
517 int num = mmd->sender_cmd_data.cmd_num,
518 s = mmd->sender_cmd_data.sender_num;
520 if (senders[s].client_cmds[num])
521 senders[s].client_cmds[num](&mmd->sender_cmd_data);
522 mmd->sender_cmd_data.cmd_num = -1;
524 if (!FD_ISSET(sockfd, &rfds))
527 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
530 PARA_INFO_LOG("got connection from %s, forking\n",
531 inet_ntoa(their_addr.sin_addr));
533 mmd->active_connections++;
537 PARA_CRIT_LOG("%s", "fork failed\n");
542 /* parent keeps accepting connections */
545 alarm(ALARM_TIMEOUT);
547 close(sockfd); /* child doesn't need the listener */
549 * put info on who we are serving into argv[0] to make
550 * client ip visible in top/ps
552 for (i = argc - 1; i >= 0; i--)
553 memset(argv[i], 0, strlen(argv[i]));
554 sprintf(argv[0], "para_server (serving %s)",
555 inet_ntoa(their_addr.sin_addr));
556 return handle_connect(new_fd, &their_addr);