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->afd.path, "(none)");
156 mmd->vss_status_flags = VSS_NEXT;
157 mmd->new_vss_status_flags = VSS_NEXT;
158 mmd->sender_cmd_data.cmd_num = -1;
161 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
166 * lock the shared memory area containing the mmd struct
168 * \sa semop(2), struct misc_meta_data
172 mutex_lock(mmd_mutex);
176 * unlock the shared memory area containing the mmd struct
178 * \sa semop(2), struct misc_meta_data
181 void mmd_unlock(void)
183 mutex_unlock(mmd_mutex);
186 static void parse_config(int override)
188 char *home = para_homedir();
193 if (conf.config_file_given)
194 cf = para_strdup(conf.config_file_arg);
196 cf = make_message("%s/.paraslash/server.conf", home);
197 free(user_list_file);
198 if (!conf.user_list_given)
199 user_list_file = make_message("%s/.paraslash/server.users", home);
201 user_list_file = para_strdup(conf.user_list_arg);
202 ret = stat(cf, &statbuf);
203 if (ret && conf.config_file_given) {
205 PARA_EMERG_LOG("can not stat config file %s\n", cf);
209 int tmp = conf.daemon_given;
210 struct server_cmdline_parser_params params = {
211 .override = override,
216 server_cmdline_parser_config_file(cf, &conf, ¶ms);
217 conf.daemon_given = tmp;
220 if (!conf.logfile_given && conf.daemon_given) {
222 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
225 if (conf.logfile_given)
226 logfile = open_log(conf.logfile_arg);
233 free(user_list_file);
234 user_list_file = NULL;
238 static void setup_signal_handling(void)
242 signal_pipe = para_signal_init();
243 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
244 ret += para_install_sighandler(SIGINT);
245 ret += para_install_sighandler(SIGTERM);
246 ret += para_install_sighandler(SIGHUP);
247 ret += para_install_sighandler(SIGCHLD);
248 ret += para_install_sighandler(SIGUSR1);
249 signal(SIGPIPE, SIG_IGN);
251 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
256 static unsigned init_network(void)
258 int fd, ret = init_tcp_socket(conf.port_arg);
263 ret = mark_fd_nonblock(fd);
268 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
272 static void init_random_seed(void)
276 size_t len = sizeof(unsigned int);
278 fd = open("/dev/urandom", O_RDONLY);
282 if (read(fd, &seed, len) != len)
291 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
296 uint32_t afs_socket_cookie;
298 static pid_t afs_pid;
300 static void init_afs(void)
302 int ret, afs_server_socket[2];
304 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
307 afs_socket_cookie = para_random((uint32_t)-1);
311 if (!afs_pid) { /* child (afs) */
312 close(afs_server_socket[0]);
313 afs_init(afs_socket_cookie, afs_server_socket[1]);
315 close(afs_server_socket[1]);
316 afs_socket = afs_server_socket[0];
317 ret = mark_fd_nonblock(afs_socket);
320 add_close_on_fork_list(afs_socket);
321 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
322 (unsigned) afs_socket_cookie);
326 static unsigned do_inits(int argc, char **argv)
328 /* connector's address information */
332 /* parse command line options */
333 server_cmdline_parser(argc, argv, &conf);
334 HANDLE_VERSION_FLAG("server", conf);
335 para_drop_privileges(conf.user_arg, conf.group_arg);
336 /* parse config file, open log and set defaults */
338 log_welcome("para_server", conf.loglevel_arg);
339 shm_init(); /* init mmd struct */
340 server_uptime(UPTIME_SET); /* reset server uptime */
341 init_user_list(user_list_file);
343 if (conf.daemon_given)
345 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
348 mmd->server_pid = getpid();
349 setup_signal_handling();
352 /* init network socket */
353 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
354 sockfd = init_network();
355 PARA_NOTICE_LOG("%s", "init complete\n");
360 * called when server gets SIGHUP or when client invokes hup command.
362 static void handle_sighup(void)
364 PARA_NOTICE_LOG("%s", "SIGHUP\n");
365 close_log(logfile); /* gets reopened if necessary by parse_config */
367 parse_config(1); /* reopens log */
368 init_user_list(user_list_file); /* reload user list */
370 kill(afs_pid, SIGHUP);
373 static void status_refresh(void)
375 static int prev_uptime = -1, prev_events = -1;
376 int uptime = server_uptime(UPTIME_GET), ret = 1;
378 if (prev_events != mmd->events)
380 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
382 if (uptime / 60 != prev_uptime / 60)
386 prev_uptime = uptime;
387 prev_events = mmd->events;
388 mmd->vss_status_flags = mmd->new_vss_status_flags;
390 PARA_DEBUG_LOG("%d events, forcing status update\n",
397 * the main function of para_server
399 * \param argc usual argument count
400 * \param argv usual argument vector
402 * \return EXIT_SUCCESS or EXIT_FAILURE
405 int main(int argc, char *argv[])
407 /* listen on sock_fd, new connection on new_fd */
409 struct sockaddr_in their_addr;
410 int i, max_fileno, ret;
413 struct timeval *timeout;
416 sockfd = do_inits(argc, argv);
421 /* check socket and signal pipe in any case */
422 para_fd_set(sockfd, &rfds, &max_fileno);
423 para_fd_set(signal_pipe, &rfds, &max_fileno);
424 timeout = vss_preselect(&rfds, &wfds, &max_fileno);
426 for (i = 0; senders[i].name; i++) {
427 if (senders[i].status != SENDER_ON)
429 if (!senders[i].pre_select)
431 senders[i].pre_select(&max_fileno, &rfds, &wfds);
434 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
436 vss_post_select(&rfds, &wfds);
439 for (i = 0; senders[i].name; i++) {
440 if (senders[i].status != SENDER_ON)
442 if (!senders[i].post_select)
444 senders[i].post_select(&rfds, &wfds);
448 if (FD_ISSET(signal_pipe, &rfds)) {
451 sig = para_next_signal();
458 ret = para_reap_child(&pid);
463 PARA_EMERG_LOG("fatal: afs died\n");
467 /* die on sigint/sigterm. Kill all children too. */
470 PARA_EMERG_LOG("terminating on signal %d\n", sig);
473 mutex_destroy(mmd_mutex);
475 shm_destroy(mmd_shm_id);
480 if (mmd->sender_cmd_data.cmd_num >= 0) {
481 int num = mmd->sender_cmd_data.cmd_num,
482 s = mmd->sender_cmd_data.sender_num;
484 if (senders[s].client_cmds[num])
485 senders[s].client_cmds[num](&mmd->sender_cmd_data);
486 mmd->sender_cmd_data.cmd_num = -1;
488 if (!FD_ISSET(sockfd, &rfds))
491 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
494 PARA_INFO_LOG("got connection from %s, forking\n",
495 inet_ntoa(their_addr.sin_addr));
497 mmd->active_connections++;
501 PARA_CRIT_LOG("%s", "fork failed\n");
506 /* parent keeps accepting connections */
509 alarm(ALARM_TIMEOUT);
511 close(sockfd); /* child doesn't need the listener */
513 * put info on who we are serving into argv[0] to make
514 * client ip visible in top/ps
516 for (i = argc - 1; i >= 0; i--)
517 memset(argv[i], 0, strlen(argv[i]));
518 sprintf(argv[0], "para_server (serving %s)",
519 inet_ntoa(their_addr.sin_addr));
520 return handle_connect(new_fd, &their_addr);