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
20 #include "server.cmdline.h"
21 #include "afs_common.h"
26 #include "close_on_fork.h"
35 #include "user_list.h"
38 /** define the array of error lists needed by para_server */
41 /** shut down non-authorized connections after that many seconds */
42 #define ALARM_TIMEOUT 10
45 * pointer to shared memory area for communication between para_server
46 * and its children. exported to vss.c. command.c and to all selectors.
48 struct misc_meta_data *mmd;
51 * the configuration of para_server
53 * It also contains the options for all audio file selectors, audio format handler
54 * and all supported senders.
56 struct server_args_info conf;
58 /** the file containing user information (public key, permissions) */
59 char *user_list_file = NULL;
61 extern void dccp_send_init(struct sender *);
62 extern void http_send_init(struct sender *);
63 extern void ortp_send_init(struct sender *);
65 /* TODO: This is better handled by autoconf */
66 /** the list of supported audio file selectors */
67 struct audio_file_selector selectors[] = {
70 .init = random_selector_init,
71 .update_audio_file = NULL,
75 .init = playlist_selector_init,
76 .update_audio_file = NULL,
83 .init = mysql_selector_init,
84 .update_audio_file = NULL,
94 /** the list of supported senders */
95 struct sender senders[] = {
98 .init = http_send_init,
102 .init = dccp_send_init,
107 .init = ortp_send_init,
116 /* global variables for server-internal use */
117 static FILE *logfile;
118 static int mmd_mutex, mmd_shm_id;
119 static int signal_pipe;
122 * para_server's log function
124 * \param ll the log level
125 * \param fmt the format string describing the log message
127 void para_log(int ll, const char* fmt,...)
133 char str[MAXLINE] = "";
136 if (ll < conf.loglevel_arg)
138 outfd = logfile? logfile : stderr;
141 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
142 fprintf(outfd, "%s ", str);
143 if (conf.loglevel_arg <= INFO)
144 fprintf(outfd, "%i: ", ll);
146 if (conf.loglevel_arg <= INFO)
147 fprintf(outfd, "(%d) ", mypid);
149 vfprintf(outfd, fmt, argp);
154 * setup shared memory area and get mutex for locking
156 static void shm_init(void)
159 int ret = shm_new(sizeof(struct misc_meta_data));
164 ret = shm_attach(ret, ATTACH_RW, &shm);
175 mmd->selector_num = 0;
177 mmd->num_commands = 0;
179 mmd->num_connects = 0;
180 mmd->active_connections = 0;
181 strcpy(mmd->filename, "(none)");
182 mmd->audio_format = -1;
183 mmd->vss_status_flags = VSS_NEXT;
184 mmd->new_vss_status_flags = VSS_NEXT;
185 mmd->sender_cmd_data.cmd_num = -1;
188 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
193 * lock the shared memory area containing the mmd struct
195 * \sa semop(2), struct misc_meta_data
199 mutex_lock(mmd_mutex);
203 * unlock the shared memory area containing the mmd struct
205 * \sa semop(2), struct misc_meta_data
208 void mmd_unlock(void)
210 mutex_unlock(mmd_mutex);
213 static void parse_config(int override)
215 char *home = para_homedir();
220 if (conf.config_file_given)
221 cf = conf.config_file_arg;
223 cf = make_message("%s/.paraslash/server.conf", home);
224 free(user_list_file);
225 if (!conf.user_list_given)
226 user_list_file = make_message("%s/.paraslash/server.users", home);
228 user_list_file = para_strdup(conf.user_list_arg);
229 ret = stat(cf, &statbuf);
230 if (ret && conf.config_file_given) {
232 PARA_EMERG_LOG("can not stat config file %s\n", cf);
236 int tmp = conf.daemon_given;
237 struct server_cmdline_parser_params params = {
238 .override = override,
243 server_cmdline_parser_config_file(cf, &conf, ¶ms);
244 conf.daemon_given = tmp;
247 if (!conf.logfile_given && conf.daemon_given) {
249 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
252 if (conf.logfile_given)
253 logfile = open_log(conf.logfile_arg);
260 free(user_list_file);
261 user_list_file = NULL;
265 static void setup_signal_handling(void)
269 signal_pipe = para_signal_init();
270 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
271 ret += para_install_sighandler(SIGINT);
272 ret += para_install_sighandler(SIGTERM);
273 ret += para_install_sighandler(SIGHUP);
274 ret += para_install_sighandler(SIGCHLD);
275 ret += para_install_sighandler(SIGUSR1);
276 signal(SIGPIPE, SIG_IGN);
278 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
283 static void init_selector(void)
287 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
288 if (!conf.selector_given)
290 for (i = 0; selectors[i].name; i++) {
291 if (strcmp(selectors[i].name, conf.selector_arg))
293 PARA_NOTICE_LOG("initializing %s audio file selector\n",
295 ret = selectors[i].init(&selectors[i]);
297 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
300 mmd->selector_num = i;
303 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
305 mmd->selector_num = 0;
306 selectors[0].init(&selectors[0]); /* always successful */
309 static unsigned init_network(void)
311 int fd, ret = init_tcp_socket(conf.port_arg);
316 ret = mark_fd_nonblock(fd);
321 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
325 static void init_random_seed(void)
329 size_t len = sizeof(unsigned int);
331 fd = open("/dev/urandom", O_RDONLY);
335 if (read(fd, &seed, len) != len)
344 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
349 static uint32_t afs_socket_cookie;
350 static int afs_socket;
353 static void init_afs(void)
355 int ret, afs_server_socket[2];
357 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
360 afs_socket_cookie = para_random((uint32_t)-1);
364 if (!afs_pid) /* child (afs) */
365 afs_init(afs_socket_cookie, afs_server_socket[1]);
366 close(afs_server_socket[1]);
367 afs_socket = afs_server_socket[0];
368 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
369 (unsigned) afs_socket_cookie);
373 static unsigned do_inits(int argc, char **argv)
375 /* connector's address information */
379 /* parse command line options */
380 server_cmdline_parser(argc, argv, &conf);
381 HANDLE_VERSION_FLAG("server", conf);
382 para_drop_privileges(conf.user_arg, conf.group_arg);
383 /* parse config file, open log and set defaults */
385 log_welcome("para_server", conf.loglevel_arg);
386 shm_init(); /* init mmd struct */
387 server_uptime(UPTIME_SET); /* reset server uptime */
388 init_user_list(user_list_file);
390 if (conf.daemon_given)
393 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
394 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
396 mmd->server_pid = getpid();
397 setup_signal_handling();
400 /* init network socket */
401 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
402 sockfd = init_network();
403 PARA_NOTICE_LOG("%s", "init complete\n");
407 static void change_selector(void)
409 int ret, old = mmd->selector_num, new = mmd->selector_change;
411 selectors[old].shutdown();
412 ret = selectors[new].init(&selectors[new]);
413 mmd->selector_change = -1; /* reset */
415 mmd->selector_num = new;
419 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
420 selectors[0].init(&selectors[0]);
421 mmd->selector_num = 0;
425 * called when server gets SIGHUP or when client invokes hup command.
427 static void handle_sighup(void)
429 PARA_NOTICE_LOG("%s", "SIGHUP\n");
430 close_log(logfile); /* gets reopened if necessary by parse_config */
432 parse_config(1); /* reopens log */
433 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
434 change_selector(); /* .. just reload */
435 init_user_list(user_list_file); /* reload user list */
438 static void status_refresh(void)
440 static int prev_uptime = -1, prev_events = -1;
441 int uptime = server_uptime(UPTIME_GET), ret = 1;
443 if (prev_events != mmd->events)
445 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
447 if (uptime / 60 != prev_uptime / 60)
451 prev_uptime = uptime;
452 prev_events = mmd->events;
453 mmd->vss_status_flags = mmd->new_vss_status_flags;
455 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
456 mmd->events, mmd->audio_format);
462 * the main function of para_server
464 * \param argc usual argument count
465 * \param argv usual argument vector
467 * \return EXIT_SUCCESS or EXIT_FAILURE
470 int main(int argc, char *argv[])
472 /* listen on sock_fd, new connection on new_fd */
474 struct sockaddr_in their_addr;
475 int i, max_fileno, ret;
478 struct timeval *timeout;
481 sockfd = do_inits(argc, argv);
486 /* check socket and signal pipe in any case */
487 para_fd_set(sockfd, &rfds, &max_fileno);
488 para_fd_set(signal_pipe, &rfds, &max_fileno);
489 timeout = vss_preselect();
491 for (i = 0; senders[i].name; i++) {
492 if (senders[i].status != SENDER_ON)
494 if (!senders[i].pre_select)
496 senders[i].pre_select( &max_fileno, &rfds, &wfds);
498 if (selectors[mmd->selector_num].pre_select) {
499 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
500 max_fileno = PARA_MAX(max_fileno, ret);
503 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
505 if (mmd->selector_change >= 0)
507 if (selectors[mmd->selector_num].post_select)
508 selectors[mmd->selector_num].post_select(&rfds, &wfds);
511 for (i = 0; senders[i].name; i++) {
512 if (senders[i].status != SENDER_ON)
514 if (!senders[i].post_select)
516 senders[i].post_select(&rfds, &wfds);
520 if (FD_ISSET(signal_pipe, &rfds)) {
523 sig = para_next_signal();
530 pid = para_reap_child();
535 PARA_EMERG_LOG("fatal: afs died\n");
539 /* die on sigint/sigterm. Kill all children too. */
542 PARA_EMERG_LOG("terminating on signal %d\n", sig);
545 selectors[mmd->selector_num].shutdown();
546 mutex_destroy(mmd_mutex);
548 shm_destroy(mmd_shm_id);
553 if (mmd->sender_cmd_data.cmd_num >= 0) {
554 int num = mmd->sender_cmd_data.cmd_num,
555 s = mmd->sender_cmd_data.sender_num;
557 if (senders[s].client_cmds[num])
558 senders[s].client_cmds[num](&mmd->sender_cmd_data);
559 mmd->sender_cmd_data.cmd_num = -1;
561 if (!FD_ISSET(sockfd, &rfds))
564 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
567 PARA_INFO_LOG("got connection from %s, forking\n",
568 inet_ntoa(their_addr.sin_addr));
570 mmd->active_connections++;
574 PARA_CRIT_LOG("%s", "fork failed\n");
579 /* parent keeps accepting connections */
582 alarm(ALARM_TIMEOUT);
584 close(sockfd); /* child doesn't need the listener */
586 * put info on who we are serving into argv[0] to make
587 * client ip visible in top/ps
589 for (i = argc - 1; i >= 0; i--)
590 memset(argv[i], 0, strlen(argv[i]));
591 sprintf(argv[0], "para_server (serving %s)",
592 inet_ntoa(their_addr.sin_addr));
593 return handle_connect(new_fd, &their_addr);