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);
150 mmd->selector_num = 0;
152 mmd->num_commands = 0;
154 mmd->num_connects = 0;
155 mmd->active_connections = 0;
156 strcpy(mmd->filename, "(none)");
157 mmd->audio_format = -1;
158 mmd->vss_status_flags = VSS_NEXT;
159 mmd->new_vss_status_flags = VSS_NEXT;
160 mmd->sender_cmd_data.cmd_num = -1;
163 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
168 * lock the shared memory area containing the mmd struct
170 * \sa semop(2), struct misc_meta_data
174 mutex_lock(mmd_mutex);
178 * unlock the shared memory area containing the mmd struct
180 * \sa semop(2), struct misc_meta_data
183 void mmd_unlock(void)
185 mutex_unlock(mmd_mutex);
188 static void parse_config(int override)
190 char *home = para_homedir();
195 if (conf.config_file_given)
196 cf = conf.config_file_arg;
198 cf = make_message("%s/.paraslash/server.conf", home);
199 free(user_list_file);
200 if (!conf.user_list_given)
201 user_list_file = make_message("%s/.paraslash/server.users", home);
203 user_list_file = para_strdup(conf.user_list_arg);
204 ret = stat(cf, &statbuf);
205 if (ret && conf.config_file_given) {
207 PARA_EMERG_LOG("can not stat config file %s\n", cf);
211 int tmp = conf.daemon_given;
212 struct server_cmdline_parser_params params = {
213 .override = override,
218 server_cmdline_parser_config_file(cf, &conf, ¶ms);
219 conf.daemon_given = tmp;
222 if (!conf.logfile_given && conf.daemon_given) {
224 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
227 if (conf.logfile_given)
228 logfile = open_log(conf.logfile_arg);
235 free(user_list_file);
236 user_list_file = NULL;
240 static void setup_signal_handling(void)
244 signal_pipe = para_signal_init();
245 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
246 ret += para_install_sighandler(SIGINT);
247 ret += para_install_sighandler(SIGTERM);
248 ret += para_install_sighandler(SIGHUP);
249 ret += para_install_sighandler(SIGCHLD);
250 ret += para_install_sighandler(SIGUSR1);
251 signal(SIGPIPE, SIG_IGN);
253 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
258 static unsigned init_network(void)
260 int fd, ret = init_tcp_socket(conf.port_arg);
265 ret = mark_fd_nonblock(fd);
270 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
274 static void init_random_seed(void)
278 size_t len = sizeof(unsigned int);
280 fd = open("/dev/urandom", O_RDONLY);
284 if (read(fd, &seed, len) != len)
293 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
298 uint32_t afs_socket_cookie;
300 static pid_t afs_pid;
302 static void init_afs(void)
304 int ret, afs_server_socket[2];
306 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
309 afs_socket_cookie = para_random((uint32_t)-1);
313 if (!afs_pid) { /* child (afs) */
314 close(afs_server_socket[0]);
315 afs_init(afs_socket_cookie, afs_server_socket[1]);
317 close(afs_server_socket[1]);
318 afs_socket = afs_server_socket[0];
319 ret = mark_fd_nonblock(afs_socket);
322 add_close_on_fork_list(afs_socket);
323 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
324 (unsigned) afs_socket_cookie);
328 static unsigned do_inits(int argc, char **argv)
330 /* connector's address information */
334 /* parse command line options */
335 server_cmdline_parser(argc, argv, &conf);
336 HANDLE_VERSION_FLAG("server", conf);
337 para_drop_privileges(conf.user_arg, conf.group_arg);
338 /* parse config file, open log and set defaults */
340 log_welcome("para_server", conf.loglevel_arg);
341 shm_init(); /* init mmd struct */
342 server_uptime(UPTIME_SET); /* reset server uptime */
343 init_user_list(user_list_file);
345 if (conf.daemon_given)
348 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
349 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
352 mmd->server_pid = getpid();
353 setup_signal_handling();
356 /* init network socket */
357 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
358 sockfd = init_network();
359 PARA_NOTICE_LOG("%s", "init complete\n");
364 * called when server gets SIGHUP or when client invokes hup command.
366 static void handle_sighup(void)
368 PARA_NOTICE_LOG("%s", "SIGHUP\n");
369 close_log(logfile); /* gets reopened if necessary by parse_config */
371 parse_config(1); /* reopens log */
372 init_user_list(user_list_file); /* reload user list */
374 kill(afs_pid, SIGHUP);
377 static void status_refresh(void)
379 static int prev_uptime = -1, prev_events = -1;
380 int uptime = server_uptime(UPTIME_GET), ret = 1;
382 if (prev_events != mmd->events)
384 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
386 if (uptime / 60 != prev_uptime / 60)
390 prev_uptime = uptime;
391 prev_events = mmd->events;
392 mmd->vss_status_flags = mmd->new_vss_status_flags;
394 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
395 mmd->events, mmd->audio_format);
401 * the main function of para_server
403 * \param argc usual argument count
404 * \param argv usual argument vector
406 * \return EXIT_SUCCESS or EXIT_FAILURE
409 int main(int argc, char *argv[])
411 /* listen on sock_fd, new connection on new_fd */
413 struct sockaddr_in their_addr;
414 int i, max_fileno, ret;
417 struct timeval *timeout;
420 sockfd = do_inits(argc, argv);
425 /* check socket and signal pipe in any case */
426 para_fd_set(sockfd, &rfds, &max_fileno);
427 para_fd_set(signal_pipe, &rfds, &max_fileno);
428 timeout = vss_preselect(&rfds, &wfds, &max_fileno);
430 for (i = 0; senders[i].name; i++) {
431 if (senders[i].status != SENDER_ON)
433 if (!senders[i].pre_select)
435 senders[i].pre_select(&max_fileno, &rfds, &wfds);
438 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
440 vss_post_select(&rfds, &wfds);
443 for (i = 0; senders[i].name; i++) {
444 if (senders[i].status != SENDER_ON)
446 if (!senders[i].post_select)
448 senders[i].post_select(&rfds, &wfds);
452 if (FD_ISSET(signal_pipe, &rfds)) {
455 sig = para_next_signal();
462 ret = para_reap_child(&pid);
467 PARA_EMERG_LOG("fatal: afs died\n");
471 /* die on sigint/sigterm. Kill all children too. */
474 PARA_EMERG_LOG("terminating on signal %d\n", sig);
477 mutex_destroy(mmd_mutex);
479 shm_destroy(mmd_shm_id);
484 if (mmd->sender_cmd_data.cmd_num >= 0) {
485 int num = mmd->sender_cmd_data.cmd_num,
486 s = mmd->sender_cmd_data.sender_num;
488 if (senders[s].client_cmds[num])
489 senders[s].client_cmds[num](&mmd->sender_cmd_data);
490 mmd->sender_cmd_data.cmd_num = -1;
492 if (!FD_ISSET(sockfd, &rfds))
495 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
498 PARA_INFO_LOG("got connection from %s, forking\n",
499 inet_ntoa(their_addr.sin_addr));
501 mmd->active_connections++;
505 PARA_CRIT_LOG("%s", "fork failed\n");
510 /* parent keeps accepting connections */
513 alarm(ALARM_TIMEOUT);
515 close(sockfd); /* child doesn't need the listener */
517 * put info on who we are serving into argv[0] to make
518 * client ip visible in top/ps
520 for (i = argc - 1; i >= 0; i--)
521 memset(argv[i], 0, strlen(argv[i]));
522 sprintf(argv[0], "para_server (serving %s)",
523 inet_ntoa(their_addr.sin_addr));
524 return handle_connect(new_fd, &their_addr);