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>
23 #include "server.cmdline.h"
24 #include "afs_common.h"
29 #include "close_on_fork.h"
40 #include "user_list.h"
43 /** define the array of error lists needed by para_server */
46 /** shut down non-authorized connections after that many seconds */
47 #define ALARM_TIMEOUT 10
50 * pointer to shared memory area for communication between para_server
51 * and its children. exported to vss.c. command.c and to all selectors.
53 struct misc_meta_data *mmd;
56 * the configuration of para_server
58 * It also contains the options for all audio file selectors, audio format handler
59 * and all supported senders.
61 struct server_args_info conf;
63 /** the file containing user information (public key, permissions) */
64 char *user_list_file = NULL;
66 extern void dccp_send_init(struct sender *);
67 extern void http_send_init(struct sender *);
68 extern void ortp_send_init(struct sender *);
70 /* TODO: This is better handled by autoconf */
71 /** the list of supported audio file selectors */
72 struct audio_file_selector selectors[] = {
75 .init = random_selector_init,
76 .update_audio_file = NULL,
80 .init = playlist_selector_init,
81 .update_audio_file = NULL,
88 .init = mysql_selector_init,
89 .update_audio_file = NULL,
99 /** the list of supported senders */
100 struct sender senders[] = {
103 .init = http_send_init,
107 .init = dccp_send_init,
112 .init = ortp_send_init,
121 /* global variables for server-internal use */
122 static FILE *logfile;
123 static int mmd_mutex, mmd_shm_id;
124 static int signal_pipe;
127 * para_server's log function
129 * \param ll the log level
130 * \param fmt the format string describing the log message
132 void para_log(int ll, const char* fmt,...)
138 char str[MAXLINE] = "";
141 if (ll < conf.loglevel_arg)
143 outfd = logfile? logfile : stderr;
146 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
147 fprintf(outfd, "%s ", str);
148 if (conf.loglevel_arg <= INFO)
149 fprintf(outfd, "%i: ", ll);
151 if (conf.loglevel_arg <= INFO)
152 fprintf(outfd, "(%d) ", mypid);
154 vfprintf(outfd, fmt, argp);
159 * setup shared memory area and get mutex for locking
161 static void shm_init(void)
164 int ret = shm_new(sizeof(struct misc_meta_data));
169 ret = shm_attach(ret, ATTACH_RW, &shm);
180 mmd->selector_num = 0;
182 mmd->num_commands = 0;
184 mmd->num_connects = 0;
185 mmd->active_connections = 0;
186 strcpy(mmd->filename, "(none)");
187 mmd->audio_format = -1;
188 mmd->vss_status_flags = VSS_NEXT;
189 mmd->new_vss_status_flags = VSS_NEXT;
190 mmd->sender_cmd_data.cmd_num = -1;
193 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
198 * lock the shared memory area containing the mmd struct
200 * \sa semop(2), struct misc_meta_data
204 mutex_lock(mmd_mutex);
208 * unlock the shared memory area containing the mmd struct
210 * \sa semop(2), struct misc_meta_data
213 void mmd_unlock(void)
215 mutex_unlock(mmd_mutex);
218 static void parse_config(int override)
220 char *home = para_homedir();
225 if (conf.config_file_given)
226 cf = conf.config_file_arg;
228 cf = make_message("%s/.paraslash/server.conf", home);
229 free(user_list_file);
230 if (!conf.user_list_given)
231 user_list_file = make_message("%s/.paraslash/server.users", home);
233 user_list_file = para_strdup(conf.user_list_arg);
234 ret = stat(cf, &statbuf);
235 if (ret && conf.config_file_given) {
237 PARA_EMERG_LOG("can not stat config file %s\n", cf);
241 int tmp = conf.daemon_given;
242 struct server_cmdline_parser_params params = {
243 .override = override,
248 server_cmdline_parser_config_file(cf, &conf, ¶ms);
249 conf.daemon_given = tmp;
252 if (!conf.logfile_given && conf.daemon_given) {
254 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
257 if (conf.logfile_given)
258 logfile = open_log(conf.logfile_arg);
265 free(user_list_file);
266 user_list_file = NULL;
270 static void setup_signal_handling(void)
274 signal_pipe = para_signal_init();
275 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
276 ret += para_install_sighandler(SIGINT);
277 ret += para_install_sighandler(SIGTERM);
278 ret += para_install_sighandler(SIGHUP);
279 ret += para_install_sighandler(SIGCHLD);
280 ret += para_install_sighandler(SIGUSR1);
281 signal(SIGPIPE, SIG_IGN);
283 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
288 static void init_selector(void)
292 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
293 if (!conf.selector_given)
295 for (i = 0; selectors[i].name; i++) {
296 if (strcmp(selectors[i].name, conf.selector_arg))
298 PARA_NOTICE_LOG("initializing %s audio file selector\n",
300 ret = selectors[i].init(&selectors[i]);
302 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
305 mmd->selector_num = i;
308 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
310 mmd->selector_num = 0;
311 selectors[0].init(&selectors[0]); /* always successful */
314 static unsigned init_network(void)
316 int fd, ret = init_tcp_socket(conf.port_arg);
321 ret = mark_fd_nonblock(fd);
326 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
330 static void init_random_seed(void)
334 size_t len = sizeof(unsigned int);
336 fd = open("/dev/urandom", O_RDONLY);
340 if (read(fd, &seed, len) != len)
349 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
354 uint32_t afs_socket_cookie;
355 static int afs_socket;
356 static pid_t afs_pid;
358 static void init_afs(void)
360 int ret, afs_server_socket[2];
362 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
365 afs_socket_cookie = para_random((uint32_t)-1);
369 if (!afs_pid) { /* child (afs) */
370 close(afs_server_socket[0]);
371 afs_init(afs_socket_cookie, afs_server_socket[1]);
373 close(afs_server_socket[1]);
374 afs_socket = afs_server_socket[0];
375 ret = mark_fd_nonblock(afs_socket);
378 add_close_on_fork_list(afs_socket);
379 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
380 (unsigned) afs_socket_cookie);
384 static unsigned do_inits(int argc, char **argv)
386 /* connector's address information */
390 /* parse command line options */
391 server_cmdline_parser(argc, argv, &conf);
392 HANDLE_VERSION_FLAG("server", conf);
393 para_drop_privileges(conf.user_arg, conf.group_arg);
394 /* parse config file, open log and set defaults */
396 log_welcome("para_server", conf.loglevel_arg);
397 shm_init(); /* init mmd struct */
398 server_uptime(UPTIME_SET); /* reset server uptime */
399 init_user_list(user_list_file);
401 if (conf.daemon_given)
404 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
405 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
407 mmd->server_pid = getpid();
408 setup_signal_handling();
411 /* init network socket */
412 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
413 sockfd = init_network();
414 PARA_NOTICE_LOG("%s", "init complete\n");
418 static void change_selector(void)
420 int ret, old = mmd->selector_num, new = mmd->selector_change;
422 selectors[old].shutdown();
423 ret = selectors[new].init(&selectors[new]);
424 mmd->selector_change = -1; /* reset */
426 mmd->selector_num = new;
430 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
431 selectors[0].init(&selectors[0]);
432 mmd->selector_num = 0;
436 * called when server gets SIGHUP or when client invokes hup command.
438 static void handle_sighup(void)
440 PARA_NOTICE_LOG("%s", "SIGHUP\n");
441 close_log(logfile); /* gets reopened if necessary by parse_config */
443 parse_config(1); /* reopens log */
444 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
445 change_selector(); /* .. just reload */
446 init_user_list(user_list_file); /* reload user list */
448 kill(afs_pid, SIGHUP);
451 static void status_refresh(void)
453 static int prev_uptime = -1, prev_events = -1;
454 int uptime = server_uptime(UPTIME_GET), ret = 1;
456 if (prev_events != mmd->events)
458 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
460 if (uptime / 60 != prev_uptime / 60)
464 prev_uptime = uptime;
465 prev_events = mmd->events;
466 mmd->vss_status_flags = mmd->new_vss_status_flags;
468 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
469 mmd->events, mmd->audio_format);
475 * the main function of para_server
477 * \param argc usual argument count
478 * \param argv usual argument vector
480 * \return EXIT_SUCCESS or EXIT_FAILURE
483 int main(int argc, char *argv[])
485 /* listen on sock_fd, new connection on new_fd */
487 struct sockaddr_in their_addr;
488 int i, max_fileno, ret;
491 struct timeval *timeout;
494 sockfd = do_inits(argc, argv);
499 /* check socket and signal pipe in any case */
500 para_fd_set(sockfd, &rfds, &max_fileno);
501 para_fd_set(signal_pipe, &rfds, &max_fileno);
502 timeout = vss_preselect();
504 for (i = 0; senders[i].name; i++) {
505 if (senders[i].status != SENDER_ON)
507 if (!senders[i].pre_select)
509 senders[i].pre_select( &max_fileno, &rfds, &wfds);
511 if (selectors[mmd->selector_num].pre_select) {
512 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
513 max_fileno = PARA_MAX(max_fileno, ret);
516 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
518 if (mmd->selector_change >= 0)
520 if (selectors[mmd->selector_num].post_select)
521 selectors[mmd->selector_num].post_select(&rfds, &wfds);
524 for (i = 0; senders[i].name; i++) {
525 if (senders[i].status != SENDER_ON)
527 if (!senders[i].post_select)
529 senders[i].post_select(&rfds, &wfds);
533 if (FD_ISSET(signal_pipe, &rfds)) {
536 sig = para_next_signal();
543 ret = para_reap_child(&pid);
548 PARA_EMERG_LOG("fatal: afs died\n");
552 /* die on sigint/sigterm. Kill all children too. */
555 PARA_EMERG_LOG("terminating on signal %d\n", sig);
558 selectors[mmd->selector_num].shutdown();
559 mutex_destroy(mmd_mutex);
561 shm_destroy(mmd_shm_id);
566 if (mmd->sender_cmd_data.cmd_num >= 0) {
567 int num = mmd->sender_cmd_data.cmd_num,
568 s = mmd->sender_cmd_data.sender_num;
570 if (senders[s].client_cmds[num])
571 senders[s].client_cmds[num](&mmd->sender_cmd_data);
572 mmd->sender_cmd_data.cmd_num = -1;
574 if (!FD_ISSET(sockfd, &rfds))
577 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
580 PARA_INFO_LOG("got connection from %s, forking\n",
581 inet_ntoa(their_addr.sin_addr));
583 mmd->active_connections++;
587 PARA_CRIT_LOG("%s", "fork failed\n");
592 /* parent keeps accepting connections */
595 alarm(ALARM_TIMEOUT);
597 close(sockfd); /* child doesn't need the listener */
599 * put info on who we are serving into argv[0] to make
600 * client ip visible in top/ps
602 for (i = argc - 1; i >= 0; i--)
603 memset(argv[i], 0, strlen(argv[i]));
604 sprintf(argv[0], "para_server (serving %s)",
605 inet_ntoa(their_addr.sin_addr));
606 return handle_connect(new_fd, &their_addr);