2 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file server.c Paraslash's main server */
10 /** \mainpage Paraslash API Reference
12 * Good starting points for reading are probably \ref audio_file_selector,
13 * \ref sender, \ref receiver, \ref receiver_node, \ref filter, \ref
19 #include <sys/types.h>
24 #include "server.cmdline.h"
31 #include "close_on_fork.h"
40 #include "user_list.h"
42 /** define the array of error lists needed by para_server */
45 /** shut down non-authorized connections after that many seconds */
46 #define ALARM_TIMEOUT 10
49 * pointer to shared memory area for communication between para_server
50 * and its children. exported to vss.c. command.c and to all selectors.
52 struct misc_meta_data *mmd;
55 * the configuration of para_server
57 * It also contains the options for all audio file selectors, audio format handler
58 * and all supported senders.
60 struct server_args_info conf;
62 /** the file containing user information (public key, permissions) */
63 char *user_list_file = NULL;
65 extern void dccp_send_init(struct sender *);
66 extern void http_send_init(struct sender *);
67 extern void ortp_send_init(struct sender *);
69 /** the list of supported senders */
70 struct sender senders[] = {
73 .init = http_send_init,
77 .init = dccp_send_init,
82 .init = ortp_send_init,
91 /* global variables for server-internal use */
93 static int mmd_mutex, mmd_shm_id;
94 static int signal_pipe;
97 * para_server's log function
99 * \param ll the log level
100 * \param fmt the format string describing the log message
102 void para_log(int ll, const char* fmt,...)
108 char str[MAXLINE] = "";
111 if (ll < conf.loglevel_arg)
113 outfd = logfile? logfile : stderr;
116 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
117 fprintf(outfd, "%s ", str);
118 if (conf.loglevel_arg <= INFO)
119 fprintf(outfd, "%i: ", ll);
121 if (conf.loglevel_arg <= INFO)
122 fprintf(outfd, "(%d) ", mypid);
124 vfprintf(outfd, fmt, argp);
129 * setup shared memory area and get mutex for locking
131 static void shm_init(void)
134 int ret = shm_new(sizeof(struct misc_meta_data));
139 ret = shm_attach(ret, ATTACH_RW, &shm);
151 mmd->num_commands = 0;
153 mmd->num_connects = 0;
154 mmd->active_connections = 0;
155 strcpy(mmd->filename, "(none)");
156 mmd->audio_format = -1;
157 mmd->vss_status_flags = VSS_NEXT;
158 mmd->new_vss_status_flags = VSS_NEXT;
159 mmd->sender_cmd_data.cmd_num = -1;
162 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
167 * lock the shared memory area containing the mmd struct
169 * \sa semop(2), struct misc_meta_data
173 mutex_lock(mmd_mutex);
177 * unlock the shared memory area containing the mmd struct
179 * \sa semop(2), struct misc_meta_data
182 void mmd_unlock(void)
184 mutex_unlock(mmd_mutex);
187 static void parse_config(int override)
189 char *home = para_homedir();
194 if (conf.config_file_given)
195 cf = conf.config_file_arg;
197 cf = make_message("%s/.paraslash/server.conf", home);
198 free(user_list_file);
199 if (!conf.user_list_given)
200 user_list_file = make_message("%s/.paraslash/server.users", home);
202 user_list_file = para_strdup(conf.user_list_arg);
203 ret = stat(cf, &statbuf);
204 if (ret && conf.config_file_given) {
206 PARA_EMERG_LOG("can not stat config file %s\n", cf);
210 int tmp = conf.daemon_given;
211 struct server_cmdline_parser_params params = {
212 .override = override,
217 server_cmdline_parser_config_file(cf, &conf, ¶ms);
218 conf.daemon_given = tmp;
221 if (!conf.logfile_given && conf.daemon_given) {
223 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
226 if (conf.logfile_given)
227 logfile = open_log(conf.logfile_arg);
234 free(user_list_file);
235 user_list_file = NULL;
239 static void setup_signal_handling(void)
243 signal_pipe = para_signal_init();
244 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
245 ret += para_install_sighandler(SIGINT);
246 ret += para_install_sighandler(SIGTERM);
247 ret += para_install_sighandler(SIGHUP);
248 ret += para_install_sighandler(SIGCHLD);
249 ret += para_install_sighandler(SIGUSR1);
250 signal(SIGPIPE, SIG_IGN);
252 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
257 static unsigned init_network(void)
259 int fd, ret = init_tcp_socket(conf.port_arg);
264 ret = mark_fd_nonblock(fd);
269 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
273 static void init_random_seed(void)
277 size_t len = sizeof(unsigned int);
279 fd = open("/dev/urandom", O_RDONLY);
283 if (read(fd, &seed, len) != len)
292 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
297 uint32_t afs_socket_cookie;
299 static pid_t afs_pid;
301 static void init_afs(void)
303 int ret, afs_server_socket[2];
305 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
308 afs_socket_cookie = para_random((uint32_t)-1);
312 if (!afs_pid) { /* child (afs) */
313 close(afs_server_socket[0]);
314 afs_init(afs_socket_cookie, afs_server_socket[1]);
316 close(afs_server_socket[1]);
317 afs_socket = afs_server_socket[0];
318 ret = mark_fd_nonblock(afs_socket);
321 add_close_on_fork_list(afs_socket);
322 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
323 (unsigned) afs_socket_cookie);
327 static unsigned do_inits(int argc, char **argv)
329 /* connector's address information */
333 /* parse command line options */
334 server_cmdline_parser(argc, argv, &conf);
335 HANDLE_VERSION_FLAG("server", conf);
336 para_drop_privileges(conf.user_arg, conf.group_arg);
337 /* parse config file, open log and set defaults */
339 log_welcome("para_server", conf.loglevel_arg);
340 shm_init(); /* init mmd struct */
341 server_uptime(UPTIME_SET); /* reset server uptime */
342 init_user_list(user_list_file);
344 if (conf.daemon_given)
346 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
349 mmd->server_pid = getpid();
350 setup_signal_handling();
353 /* init network socket */
354 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
355 sockfd = init_network();
356 PARA_NOTICE_LOG("%s", "init complete\n");
361 * called when server gets SIGHUP or when client invokes hup command.
363 static void handle_sighup(void)
365 PARA_NOTICE_LOG("%s", "SIGHUP\n");
366 close_log(logfile); /* gets reopened if necessary by parse_config */
368 parse_config(1); /* reopens log */
369 init_user_list(user_list_file); /* reload user list */
371 kill(afs_pid, SIGHUP);
374 static void status_refresh(void)
376 static int prev_uptime = -1, prev_events = -1;
377 int uptime = server_uptime(UPTIME_GET), ret = 1;
379 if (prev_events != mmd->events)
381 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
383 if (uptime / 60 != prev_uptime / 60)
387 prev_uptime = uptime;
388 prev_events = mmd->events;
389 mmd->vss_status_flags = mmd->new_vss_status_flags;
391 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
392 mmd->events, mmd->audio_format);
398 * the main function of para_server
400 * \param argc usual argument count
401 * \param argv usual argument vector
403 * \return EXIT_SUCCESS or EXIT_FAILURE
406 int main(int argc, char *argv[])
408 /* listen on sock_fd, new connection on new_fd */
410 struct sockaddr_in their_addr;
411 int i, max_fileno, ret;
414 struct timeval *timeout;
417 sockfd = do_inits(argc, argv);
422 /* check socket and signal pipe in any case */
423 para_fd_set(sockfd, &rfds, &max_fileno);
424 para_fd_set(signal_pipe, &rfds, &max_fileno);
425 timeout = vss_preselect(&rfds, &wfds, &max_fileno);
427 for (i = 0; senders[i].name; i++) {
428 if (senders[i].status != SENDER_ON)
430 if (!senders[i].pre_select)
432 senders[i].pre_select(&max_fileno, &rfds, &wfds);
435 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
437 vss_post_select(&rfds, &wfds);
440 for (i = 0; senders[i].name; i++) {
441 if (senders[i].status != SENDER_ON)
443 if (!senders[i].post_select)
445 senders[i].post_select(&rfds, &wfds);
449 if (FD_ISSET(signal_pipe, &rfds)) {
452 sig = para_next_signal();
459 ret = para_reap_child(&pid);
464 PARA_EMERG_LOG("fatal: afs died\n");
468 /* die on sigint/sigterm. Kill all children too. */
471 PARA_EMERG_LOG("terminating on signal %d\n", sig);
474 mutex_destroy(mmd_mutex);
476 shm_destroy(mmd_shm_id);
481 if (mmd->sender_cmd_data.cmd_num >= 0) {
482 int num = mmd->sender_cmd_data.cmd_num,
483 s = mmd->sender_cmd_data.sender_num;
485 if (senders[s].client_cmds[num])
486 senders[s].client_cmds[num](&mmd->sender_cmd_data);
487 mmd->sender_cmd_data.cmd_num = -1;
489 if (!FD_ISSET(sockfd, &rfds))
492 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
495 PARA_INFO_LOG("got connection from %s, forking\n",
496 inet_ntoa(their_addr.sin_addr));
498 mmd->active_connections++;
502 PARA_CRIT_LOG("%s", "fork failed\n");
507 /* parent keeps accepting connections */
510 alarm(ALARM_TIMEOUT);
512 close(sockfd); /* child doesn't need the listener */
514 * put info on who we are serving into argv[0] to make
515 * client ip visible in top/ps
517 for (i = argc - 1; i >= 0; i--)
518 memset(argv[i], 0, strlen(argv[i]));
519 sprintf(argv[0], "para_server (serving %s)",
520 inet_ntoa(their_addr.sin_addr));
521 return handle_connect(new_fd, &their_addr);