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"
37 #include <sys/mman.h> /* MAP_SHARED, PROT_READ, PROT_WRITE */
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,
78 .init = mysql_dbtool_init,
79 .update_audio_file = NULL,
87 /** the list of supported senders */
88 struct sender senders[] = {
91 .init = http_send_init,
96 .init = ortp_send_init,
105 /* global variables for server-internal use */
106 static FILE *logfile;
107 static int mmd_semid;
108 static int signal_pipe;
111 * para_server's log function
113 * \param ll the log level
114 * \param fmt the format string describing the log message
116 void para_log(int ll, char* fmt,...)
122 char str[MAXLINE] = "";
125 if (ll < conf.loglevel_arg)
134 if (conf.daemon_given && !logfile)
138 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
139 fprintf(outfd, "%s ", str);
140 if (conf.loglevel_arg <= INFO)
141 fprintf(outfd, "%i: ", ll);
143 if (conf.loglevel_arg <= INFO)
144 fprintf(outfd, "(%d) ", mypid);
146 vfprintf(outfd, fmt, argp);
152 * setup shared memory area and get semaphore for locking
154 static void shm_init(void)
159 if ((fd = open("/dev/zero", O_RDWR)) < 0) {
160 PARA_EMERG_LOG("%s", "failed to open /dev/zero\n");
163 if ((area = mmap(0, sizeof(struct misc_meta_data),
164 PROT_READ | PROT_WRITE,
165 MAP_SHARED, fd, 0)) == (caddr_t) - 1) {
166 PARA_EMERG_LOG("%s", "mmap error\n");
169 close(fd); /* we dont need /dev/zero anymore */
170 mmd = (struct misc_meta_data *)area;
174 mmd->num_commands = 0;
176 mmd->num_connects = 0;
177 mmd->active_connections = 0;
178 strcpy(mmd->filename, "(none)");
179 mmd->audio_format = -1;
180 mmd->afs_status_flags = AFS_NEXT;
181 mmd->new_afs_status_flags = AFS_NEXT;
182 mmd->sender_cmd_data.cmd_num = -1;
184 mmd_semid = semget(42, 1, IPC_CREAT | 0666);
185 if (mmd_semid == -1) {
186 PARA_EMERG_LOG("%s", "semget failed\n");
191 static void do_semop(struct sembuf *sops, int num)
193 if (semop(mmd_semid, sops, num) >= 0)
195 PARA_WARNING_LOG("semop failed (%s), retrying\n", strerror(errno));
196 while (semop(mmd_semid, sops, num) < 0)
201 * lock the shared memory area containing the mmd struct
203 * \sa semop(2), struct misc_meta_data
207 struct sembuf sops[2] = {
223 * unlock the shared memory area containing the mmd struct
225 * \sa semop(2), struct misc_meta_data
227 void mmd_unlock(void)
229 struct sembuf sops[1] = {
239 static void parse_config(int override)
241 char *home = para_homedir();
246 if (conf.config_file_given)
247 cf = conf.config_file_arg;
249 cf = make_message("%s/.paraslash/server.conf", home);
251 if (!conf.user_list_given)
252 user_list = make_message("%s/.paraslash/server.users", home);
254 user_list = para_strdup(conf.user_list_arg);
255 ret = stat(cf, &statbuf);
256 if (ret && conf.config_file_given) {
258 PARA_EMERG_LOG("can not stat config file %s\n", cf);
262 int tmp = conf.daemon_given;
263 cmdline_parser_configfile(cf, &conf, override, 0, 0);
264 conf.daemon_given = tmp;
267 if (!conf.logfile_given && conf.daemon_given) {
269 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
272 if (conf.logfile_given)
273 logfile = open_log(conf.logfile_arg);
285 static void setup_signal_handling(void)
289 signal_pipe = para_signal_init();
290 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
291 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
292 ret += para_install_sighandler(SIGINT);
293 ret += para_install_sighandler(SIGTERM);
294 ret += para_install_sighandler(SIGHUP);
295 ret += para_install_sighandler(SIGCHLD);
296 signal(SIGPIPE, SIG_IGN);
297 signal(SIGUSR1, SIG_IGN);
299 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
304 static void init_dbtool(void)
308 mmd->dbt_change = -1; /* no change nec., set to new dbt num by com_cdt */
311 if (conf.dbtool_given) {
312 for (i = 0; dblist[i].name; i++) {
313 if (strcmp(dblist[i].name, conf.dbtool_arg))
315 PARA_NOTICE_LOG("initializing %s database tool\n",
317 if (dblist[i].init(&dblist[i]) < 0) {
318 PARA_WARNING_LOG("init %s failed",
325 PARA_WARNING_LOG("%s", "no such dbtool, switching to random\n");
328 /* use the first dbtool that works
329 * (assuming that random always works)
331 for (i = 1; dblist[i].name; i++) {
332 int ret = dblist[i].init(&dblist[i]);
334 PARA_INFO_LOG("initialized %s\n", dblist[i].name);
338 PARA_CRIT_LOG("%s init failed: %s\n", dblist[i].name,
339 PARA_STRERROR(-ret));
343 dblist[0].init(&dblist[0]); /* always successful */
346 static unsigned init_network(void)
348 int sockfd = init_tcp_socket(conf.port_arg);
355 static void init_random_seed(void)
357 int fd, ret = -1, len = sizeof(unsigned int);
360 fd = open("/dev/random", O_RDONLY);
364 if (read(fd, &seed, len) != len)
373 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
378 static unsigned do_inits(int argc, char **argv)
380 /* connector's address information */
384 /* parse command line options */
385 cmdline_parser(argc, argv, &conf);
386 para_drop_privileges(conf.user_arg);
387 /* parse config file, open log and set defaults */
389 log_welcome("para_server", conf.loglevel_arg);
390 shm_init(); /* init mmd struct */
391 server_uptime(UPTIME_SET); /* reset server uptime */
393 if (conf.daemon_given)
396 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
397 /* audio file sender */
399 mmd->server_pid = getpid();
400 setup_signal_handling();
402 /* init network socket */
403 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
404 sockfd = init_network();
405 if (conf.autoplay_given) {
406 mmd->afs_status_flags |= AFS_PLAYING;
407 mmd->new_afs_status_flags |= AFS_PLAYING;
409 PARA_NOTICE_LOG("%s", "init complete\n");
413 static void handle_dbt_change(void)
415 int ret, old = mmd->dbt_num, new = mmd->dbt_change;
417 dblist[old].shutdown();
418 ret = dblist[new].init(&dblist[new]);
419 mmd->dbt_change = -1; /* reset */
425 PARA_ERROR_LOG("%s -- switching to the random dbtool\n", PARA_STRERROR(-ret));
426 dblist[0].init(&dblist[0]);
431 * called when server gets SIGHUP or when client invokes hup command.
433 static void handle_sighup(void)
435 PARA_NOTICE_LOG("%s", "SIGHUP\n");
436 close_log(logfile); /* gets reopened if necessary by parse_config */
438 parse_config(1); /* reopens log */
439 mmd->dbt_change = mmd->dbt_num; /* do not change dbtool */
440 handle_dbt_change(); /* force reloading dbtool */
443 static void status_refresh(void)
445 static int prev_uptime = -1, prev_events = -1;
446 int uptime = server_uptime(UPTIME_GET), ret = 1;
448 if (prev_events != mmd->events)
450 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
452 if (uptime / 60 != prev_uptime / 60)
456 prev_uptime = uptime;
457 prev_events = mmd->events;
458 mmd->afs_status_flags = mmd->new_afs_status_flags;
460 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
461 mmd->events, mmd->audio_format);
469 int main(int argc, char *argv[])
471 /* listen on sock_fd, new connection on new_fd */
473 struct sockaddr_in their_addr;
474 int err, i, max_fileno, ret;
477 struct timeval *timeout;
480 sockfd = do_inits(argc, argv);
482 /* check socket and signal pipe in any case */
485 FD_SET(sockfd, &rfds);
487 FD_SET(signal_pipe, &rfds);
488 max_fileno = MAX(max_fileno, signal_pipe);
490 timeout = afs_preselect();
492 for (i = 0; senders[i].name; i++) {
493 if (senders[i].status != SENDER_ON)
495 if (!senders[i].pre_select)
497 senders[i].pre_select(mmd->audio_format >= 0?
498 &afl[mmd->audio_format] : NULL,
503 // PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
504 ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);
506 //PARA_DEBUG_LOG("%s: select returned %i\n", __func__, ret);
508 if (mmd->dbt_change >= 0)
510 if (ret < 0 && err == EINTR)
513 PARA_CRIT_LOG("select error (%s)\n", strerror(err));
516 for (i = 0; senders[i].name; i++) {
517 if (senders[i].status != SENDER_ON)
519 if (!senders[i].post_select)
521 senders[i].post_select(mmd->audio_format >= 0?
522 &afl[mmd->audio_format] : NULL,
529 if (FD_ISSET(signal_pipe, &rfds)) {
531 sig = para_next_signal();
537 para_reap_children();
539 /* die on sigint/sigterm. Kill all children too. */
542 PARA_EMERG_LOG("terminating on signal %d\n", sig);
547 if (mmd->sender_cmd_data.cmd_num >= 0) {
548 int num = mmd->sender_cmd_data.cmd_num,
549 s = mmd->sender_cmd_data.sender_num;
551 if (senders[s].client_cmds[num])
552 senders[s].client_cmds[num](&mmd->sender_cmd_data);
553 mmd->sender_cmd_data.cmd_num = -1;
555 if (!FD_ISSET(sockfd, &rfds))
558 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
561 PARA_INFO_LOG("got connection from %s, forking\n",
562 inet_ntoa(their_addr.sin_addr));
564 mmd->active_connections++;
568 PARA_CRIT_LOG("%s", "fork failed\n");
573 /* parent keeps accepting connections */
576 alarm(ALARM_TIMEOUT);
578 close(sockfd); /* child doesn't need the listener */
580 * put info on who we are serving into argv[0] to make
581 * client ip visible in top/ps
583 for (i = argc - 1; i >= 0; i--)
584 memset(argv[i], 0, strlen(argv[i]));
585 sprintf(argv[0], "para_server (serving %s)",
586 inet_ntoa(their_addr.sin_addr));
587 return handle_connect(new_fd, &their_addr);