2 * Copyright (C) 1997-2007 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 #include "user_list.h"
48 /** define the array of error lists needed by para_server */
51 /** shut down non-authorized connections after that many seconds */
52 #define ALARM_TIMEOUT 10
54 /* these are exported to vss.c. command.c and to all selectors */
55 struct misc_meta_data *mmd;
56 /** the configuration of para_server
58 * It also contains the options for all audio file selectors and all supported
61 struct server_args_info conf;
62 char *user_list_file = NULL;
63 extern void dccp_send_init(struct sender *);
64 extern void http_send_init(struct sender *);
65 extern void ortp_send_init(struct sender *);
67 /* TODO: This is better handled by autoconf */
68 /** the list of supported audio file selectors */
69 struct audio_file_selector selectors[] = {
72 .init = random_selector_init,
73 .update_audio_file = NULL,
77 .init = playlist_selector_init,
78 .update_audio_file = NULL,
85 .init = mysql_selector_init,
86 .update_audio_file = NULL,
96 /** the list of supported senders */
97 struct sender senders[] = {
100 .init = http_send_init,
104 .init = dccp_send_init,
109 .init = ortp_send_init,
118 /* global variables for server-internal use */
119 static FILE *logfile;
120 static int mmd_mutex, mmd_shm_id;
121 static int signal_pipe;
124 * para_server's log function
126 * \param ll the log level
127 * \param fmt the format string describing the log message
129 void para_log(int ll, const char* fmt,...)
135 char str[MAXLINE] = "";
138 if (ll < conf.loglevel_arg)
140 outfd = logfile? logfile : stderr;
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);
177 mmd->selector_num = 0;
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->vss_status_flags = VSS_NEXT;
186 mmd->new_vss_status_flags = VSS_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);
226 free(user_list_file);
227 if (!conf.user_list_given)
228 user_list_file = make_message("%s/.paraslash/server.users", home);
230 user_list_file = 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 server_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);
256 free(user_list_file);
257 user_list_file = NULL;
261 static void setup_signal_handling(void)
265 signal_pipe = para_signal_init();
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_selector(void)
283 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
284 if (!conf.selector_given)
286 for (i = 0; selectors[i].name; i++) {
287 if (strcmp(selectors[i].name, conf.selector_arg))
289 PARA_NOTICE_LOG("initializing %s audio file selector\n",
291 ret = selectors[i].init(&selectors[i]);
293 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
296 mmd->selector_num = i;
299 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
301 mmd->selector_num = 0;
302 selectors[0].init(&selectors[0]); /* always successful */
305 static unsigned init_network(void)
307 int fd, ret = init_tcp_socket(conf.port_arg);
312 ret = mark_fd_nonblock(fd);
317 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
321 static void init_random_seed(void)
323 int fd, ret = -1, len = sizeof(unsigned int);
326 fd = open("/dev/urandom", O_RDONLY);
330 if (read(fd, &seed, len) != len)
339 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
344 static unsigned do_inits(int argc, char **argv)
346 /* connector's address information */
350 /* parse command line options */
351 server_cmdline_parser(argc, argv, &conf);
352 para_drop_privileges(conf.user_arg, conf.group_arg);
353 /* parse config file, open log and set defaults */
355 log_welcome("para_server", conf.loglevel_arg);
356 shm_init(); /* init mmd struct */
357 server_uptime(UPTIME_SET); /* reset server uptime */
358 init_user_list(user_list_file);
360 if (conf.daemon_given)
363 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
365 mmd->server_pid = getpid();
366 setup_signal_handling();
368 /* init network socket */
369 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
370 sockfd = init_network();
371 PARA_NOTICE_LOG("%s", "init complete\n");
375 static void change_selector(void)
377 int ret, old = mmd->selector_num, new = mmd->selector_change;
379 selectors[old].shutdown();
380 ret = selectors[new].init(&selectors[new]);
381 mmd->selector_change = -1; /* reset */
383 mmd->selector_num = new;
387 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
388 selectors[0].init(&selectors[0]);
389 mmd->selector_num = 0;
393 * called when server gets SIGHUP or when client invokes hup command.
395 static void handle_sighup(void)
397 PARA_NOTICE_LOG("%s", "SIGHUP\n");
398 close_log(logfile); /* gets reopened if necessary by parse_config */
400 parse_config(1); /* reopens log */
401 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
402 change_selector(); /* .. just reload */
403 init_user_list(user_list_file); /* reload user list */
406 static void status_refresh(void)
408 static int prev_uptime = -1, prev_events = -1;
409 int uptime = server_uptime(UPTIME_GET), ret = 1;
411 if (prev_events != mmd->events)
413 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
415 if (uptime / 60 != prev_uptime / 60)
419 prev_uptime = uptime;
420 prev_events = mmd->events;
421 mmd->vss_status_flags = mmd->new_vss_status_flags;
423 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
424 mmd->events, mmd->audio_format);
432 int main(int argc, char *argv[])
434 /* listen on sock_fd, new connection on new_fd */
436 struct sockaddr_in their_addr;
437 int i, max_fileno, ret;
440 struct timeval *timeout;
443 sockfd = do_inits(argc, argv);
448 /* check socket and signal pipe in any case */
449 para_fd_set(sockfd, &rfds, &max_fileno);
450 para_fd_set(signal_pipe, &rfds, &max_fileno);
451 timeout = vss_preselect();
453 for (i = 0; senders[i].name; i++) {
454 if (senders[i].status != SENDER_ON)
456 if (!senders[i].pre_select)
458 senders[i].pre_select( &max_fileno, &rfds, &wfds);
460 if (selectors[mmd->selector_num].pre_select) {
461 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
462 max_fileno = PARA_MAX(max_fileno, ret);
465 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
467 if (mmd->selector_change >= 0)
469 if (selectors[mmd->selector_num].post_select)
470 selectors[mmd->selector_num].post_select(&rfds, &wfds);
473 for (i = 0; senders[i].name; i++) {
474 if (senders[i].status != SENDER_ON)
476 if (!senders[i].post_select)
478 senders[i].post_select(&rfds, &wfds);
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);