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
18 #include <sys/types.h>
22 #include "server.cmdline.h"
23 #include "afs_common.h"
28 #include "close_on_fork.h"
39 #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 /* TODO: This is better handled by autoconf */
70 /** the list of supported audio file selectors */
71 struct audio_file_selector selectors[] = {
74 .init = random_selector_init,
75 .update_audio_file = NULL,
79 .init = playlist_selector_init,
80 .update_audio_file = NULL,
87 .init = mysql_selector_init,
88 .update_audio_file = NULL,
98 /** the list of supported senders */
99 struct sender senders[] = {
102 .init = http_send_init,
106 .init = dccp_send_init,
111 .init = ortp_send_init,
120 /* global variables for server-internal use */
121 static FILE *logfile;
122 static int mmd_mutex, mmd_shm_id;
123 static int signal_pipe;
126 * para_server's log function
128 * \param ll the log level
129 * \param fmt the format string describing the log message
131 void para_log(int ll, const char* fmt,...)
137 char str[MAXLINE] = "";
140 if (ll < conf.loglevel_arg)
142 outfd = logfile? logfile : stderr;
145 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
146 fprintf(outfd, "%s ", str);
147 if (conf.loglevel_arg <= INFO)
148 fprintf(outfd, "%i: ", ll);
150 if (conf.loglevel_arg <= INFO)
151 fprintf(outfd, "(%d) ", mypid);
153 vfprintf(outfd, fmt, argp);
158 * setup shared memory area and get mutex for locking
160 static void shm_init(void)
163 int ret = shm_new(sizeof(struct misc_meta_data));
168 ret = shm_attach(ret, ATTACH_RW, &shm);
179 mmd->selector_num = 0;
181 mmd->num_commands = 0;
183 mmd->num_connects = 0;
184 mmd->active_connections = 0;
185 strcpy(mmd->filename, "(none)");
186 mmd->audio_format = -1;
187 mmd->vss_status_flags = VSS_NEXT;
188 mmd->new_vss_status_flags = VSS_NEXT;
189 mmd->sender_cmd_data.cmd_num = -1;
192 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
197 * lock the shared memory area containing the mmd struct
199 * \sa semop(2), struct misc_meta_data
203 mutex_lock(mmd_mutex);
207 * unlock the shared memory area containing the mmd struct
209 * \sa semop(2), struct misc_meta_data
212 void mmd_unlock(void)
214 mutex_unlock(mmd_mutex);
217 static void parse_config(int override)
219 char *home = para_homedir();
224 if (conf.config_file_given)
225 cf = conf.config_file_arg;
227 cf = make_message("%s/.paraslash/server.conf", home);
228 free(user_list_file);
229 if (!conf.user_list_given)
230 user_list_file = make_message("%s/.paraslash/server.users", home);
232 user_list_file = para_strdup(conf.user_list_arg);
233 ret = stat(cf, &statbuf);
234 if (ret && conf.config_file_given) {
236 PARA_EMERG_LOG("can not stat config file %s\n", cf);
240 int tmp = conf.daemon_given;
241 struct server_cmdline_parser_params params = {
242 .override = override,
247 server_cmdline_parser_config_file(cf, &conf, ¶ms);
248 conf.daemon_given = tmp;
251 if (!conf.logfile_given && conf.daemon_given) {
253 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
256 if (conf.logfile_given)
257 logfile = open_log(conf.logfile_arg);
264 free(user_list_file);
265 user_list_file = NULL;
269 static void setup_signal_handling(void)
273 signal_pipe = para_signal_init();
274 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
275 ret += para_install_sighandler(SIGINT);
276 ret += para_install_sighandler(SIGTERM);
277 ret += para_install_sighandler(SIGHUP);
278 ret += para_install_sighandler(SIGCHLD);
279 ret += para_install_sighandler(SIGUSR1);
280 signal(SIGPIPE, SIG_IGN);
282 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
287 static void init_selector(void)
291 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
292 if (!conf.selector_given)
294 for (i = 0; selectors[i].name; i++) {
295 if (strcmp(selectors[i].name, conf.selector_arg))
297 PARA_NOTICE_LOG("initializing %s audio file selector\n",
299 ret = selectors[i].init(&selectors[i]);
301 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
304 mmd->selector_num = i;
307 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
309 mmd->selector_num = 0;
310 selectors[0].init(&selectors[0]); /* always successful */
313 static unsigned init_network(void)
315 int fd, ret = init_tcp_socket(conf.port_arg);
320 ret = mark_fd_nonblock(fd);
325 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
329 static void init_random_seed(void)
333 size_t len = sizeof(unsigned int);
335 fd = open("/dev/urandom", O_RDONLY);
339 if (read(fd, &seed, len) != len)
348 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
353 uint32_t afs_socket_cookie;
354 static int afs_socket;
357 static void init_afs(void)
359 int ret, afs_server_socket[2];
361 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
364 afs_socket_cookie = para_random((uint32_t)-1);
368 if (!afs_pid) { /* child (afs) */
369 close(afs_server_socket[0]);
370 afs_init(afs_socket_cookie, afs_server_socket[1]);
372 close(afs_server_socket[1]);
373 afs_socket = afs_server_socket[0];
374 ret = mark_fd_nonblock(afs_socket);
377 add_close_on_fork_list(afs_socket);
378 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
379 (unsigned) afs_socket_cookie);
383 static unsigned do_inits(int argc, char **argv)
385 /* connector's address information */
389 /* parse command line options */
390 server_cmdline_parser(argc, argv, &conf);
391 HANDLE_VERSION_FLAG("server", conf);
392 para_drop_privileges(conf.user_arg, conf.group_arg);
393 /* parse config file, open log and set defaults */
395 log_welcome("para_server", conf.loglevel_arg);
396 shm_init(); /* init mmd struct */
397 server_uptime(UPTIME_SET); /* reset server uptime */
398 init_user_list(user_list_file);
400 if (conf.daemon_given)
403 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
404 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
406 mmd->server_pid = getpid();
407 setup_signal_handling();
410 /* init network socket */
411 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
412 sockfd = init_network();
413 PARA_NOTICE_LOG("%s", "init complete\n");
417 static void change_selector(void)
419 int ret, old = mmd->selector_num, new = mmd->selector_change;
421 selectors[old].shutdown();
422 ret = selectors[new].init(&selectors[new]);
423 mmd->selector_change = -1; /* reset */
425 mmd->selector_num = new;
429 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
430 selectors[0].init(&selectors[0]);
431 mmd->selector_num = 0;
435 * called when server gets SIGHUP or when client invokes hup command.
437 static void handle_sighup(void)
439 PARA_NOTICE_LOG("%s", "SIGHUP\n");
440 close_log(logfile); /* gets reopened if necessary by parse_config */
442 parse_config(1); /* reopens log */
443 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
444 change_selector(); /* .. just reload */
445 init_user_list(user_list_file); /* reload user list */
448 static void status_refresh(void)
450 static int prev_uptime = -1, prev_events = -1;
451 int uptime = server_uptime(UPTIME_GET), ret = 1;
453 if (prev_events != mmd->events)
455 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
457 if (uptime / 60 != prev_uptime / 60)
461 prev_uptime = uptime;
462 prev_events = mmd->events;
463 mmd->vss_status_flags = mmd->new_vss_status_flags;
465 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
466 mmd->events, mmd->audio_format);
472 * the main function of para_server
474 * \param argc usual argument count
475 * \param argv usual argument vector
477 * \return EXIT_SUCCESS or EXIT_FAILURE
480 int main(int argc, char *argv[])
482 /* listen on sock_fd, new connection on new_fd */
484 struct sockaddr_in their_addr;
485 int i, max_fileno, ret;
488 struct timeval *timeout;
491 sockfd = do_inits(argc, argv);
496 /* check socket and signal pipe in any case */
497 para_fd_set(sockfd, &rfds, &max_fileno);
498 para_fd_set(signal_pipe, &rfds, &max_fileno);
499 timeout = vss_preselect();
501 for (i = 0; senders[i].name; i++) {
502 if (senders[i].status != SENDER_ON)
504 if (!senders[i].pre_select)
506 senders[i].pre_select( &max_fileno, &rfds, &wfds);
508 if (selectors[mmd->selector_num].pre_select) {
509 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
510 max_fileno = PARA_MAX(max_fileno, ret);
513 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
515 if (mmd->selector_change >= 0)
517 if (selectors[mmd->selector_num].post_select)
518 selectors[mmd->selector_num].post_select(&rfds, &wfds);
521 for (i = 0; senders[i].name; i++) {
522 if (senders[i].status != SENDER_ON)
524 if (!senders[i].post_select)
526 senders[i].post_select(&rfds, &wfds);
530 if (FD_ISSET(signal_pipe, &rfds)) {
533 sig = para_next_signal();
540 pid = para_reap_child();
545 PARA_EMERG_LOG("fatal: afs died\n");
549 /* die on sigint/sigterm. Kill all children too. */
552 PARA_EMERG_LOG("terminating on signal %d\n", sig);
555 selectors[mmd->selector_num].shutdown();
556 mutex_destroy(mmd_mutex);
558 shm_destroy(mmd_shm_id);
563 if (mmd->sender_cmd_data.cmd_num >= 0) {
564 int num = mmd->sender_cmd_data.cmd_num,
565 s = mmd->sender_cmd_data.sender_num;
567 if (senders[s].client_cmds[num])
568 senders[s].client_cmds[num](&mmd->sender_cmd_data);
569 mmd->sender_cmd_data.cmd_num = -1;
571 if (!FD_ISSET(sockfd, &rfds))
574 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
577 PARA_INFO_LOG("got connection from %s, forking\n",
578 inet_ntoa(their_addr.sin_addr));
580 mmd->active_connections++;
584 PARA_CRIT_LOG("%s", "fork failed\n");
589 /* parent keeps accepting connections */
592 alarm(ALARM_TIMEOUT);
594 close(sockfd); /* child doesn't need the listener */
596 * put info on who we are serving into argv[0] to make
597 * client ip visible in top/ps
599 for (i = argc - 1; i >= 0; i--)
600 memset(argv[i], 0, strlen(argv[i]));
601 sprintf(argv[0], "para_server (serving %s)",
602 inet_ntoa(their_addr.sin_addr));
603 return handle_connect(new_fd, &their_addr);