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"
25 #include "afs_common.h"
32 #include "close_on_fork.h"
41 #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 /** the list of supported senders */
71 struct sender senders[] = {
74 .init = http_send_init,
78 .init = dccp_send_init,
83 .init = ortp_send_init,
92 /* global variables for server-internal use */
94 static int mmd_mutex, mmd_shm_id;
95 static int signal_pipe;
98 * para_server's log function
100 * \param ll the log level
101 * \param fmt the format string describing the log message
103 void para_log(int ll, const char* fmt,...)
109 char str[MAXLINE] = "";
112 if (ll < conf.loglevel_arg)
114 outfd = logfile? logfile : stderr;
117 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
118 fprintf(outfd, "%s ", str);
119 if (conf.loglevel_arg <= INFO)
120 fprintf(outfd, "%i: ", ll);
122 if (conf.loglevel_arg <= INFO)
123 fprintf(outfd, "(%d) ", mypid);
125 vfprintf(outfd, fmt, argp);
130 * setup shared memory area and get mutex for locking
132 static void shm_init(void)
135 int ret = shm_new(sizeof(struct misc_meta_data));
140 ret = shm_attach(ret, ATTACH_RW, &shm);
151 mmd->selector_num = 0;
153 mmd->num_commands = 0;
155 mmd->num_connects = 0;
156 mmd->active_connections = 0;
157 strcpy(mmd->filename, "(none)");
158 mmd->audio_format = -1;
159 mmd->vss_status_flags = VSS_NEXT;
160 mmd->new_vss_status_flags = VSS_NEXT;
161 mmd->sender_cmd_data.cmd_num = -1;
164 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
169 * lock the shared memory area containing the mmd struct
171 * \sa semop(2), struct misc_meta_data
175 mutex_lock(mmd_mutex);
179 * unlock the shared memory area containing the mmd struct
181 * \sa semop(2), struct misc_meta_data
184 void mmd_unlock(void)
186 mutex_unlock(mmd_mutex);
189 static void parse_config(int override)
191 char *home = para_homedir();
196 if (conf.config_file_given)
197 cf = conf.config_file_arg;
199 cf = make_message("%s/.paraslash/server.conf", home);
200 free(user_list_file);
201 if (!conf.user_list_given)
202 user_list_file = make_message("%s/.paraslash/server.users", home);
204 user_list_file = para_strdup(conf.user_list_arg);
205 ret = stat(cf, &statbuf);
206 if (ret && conf.config_file_given) {
208 PARA_EMERG_LOG("can not stat config file %s\n", cf);
212 int tmp = conf.daemon_given;
213 struct server_cmdline_parser_params params = {
214 .override = override,
219 server_cmdline_parser_config_file(cf, &conf, ¶ms);
220 conf.daemon_given = tmp;
223 if (!conf.logfile_given && conf.daemon_given) {
225 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
228 if (conf.logfile_given)
229 logfile = open_log(conf.logfile_arg);
236 free(user_list_file);
237 user_list_file = NULL;
241 static void setup_signal_handling(void)
245 signal_pipe = para_signal_init();
246 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
247 ret += para_install_sighandler(SIGINT);
248 ret += para_install_sighandler(SIGTERM);
249 ret += para_install_sighandler(SIGHUP);
250 ret += para_install_sighandler(SIGCHLD);
251 ret += para_install_sighandler(SIGUSR1);
252 signal(SIGPIPE, SIG_IGN);
254 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
259 static unsigned init_network(void)
261 int fd, ret = init_tcp_socket(conf.port_arg);
266 ret = mark_fd_nonblock(fd);
271 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
275 static void init_random_seed(void)
279 size_t len = sizeof(unsigned int);
281 fd = open("/dev/urandom", O_RDONLY);
285 if (read(fd, &seed, len) != len)
294 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
299 uint32_t afs_socket_cookie;
301 static pid_t afs_pid;
303 static void init_afs(void)
305 int ret, afs_server_socket[2];
307 ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
310 afs_socket_cookie = para_random((uint32_t)-1);
314 if (!afs_pid) { /* child (afs) */
315 close(afs_server_socket[0]);
316 afs_init(afs_socket_cookie, afs_server_socket[1]);
318 close(afs_server_socket[1]);
319 afs_socket = afs_server_socket[0];
320 ret = mark_fd_nonblock(afs_socket);
323 add_close_on_fork_list(afs_socket);
324 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
325 (unsigned) afs_socket_cookie);
329 static unsigned do_inits(int argc, char **argv)
331 /* connector's address information */
335 /* parse command line options */
336 server_cmdline_parser(argc, argv, &conf);
337 HANDLE_VERSION_FLAG("server", conf);
338 para_drop_privileges(conf.user_arg, conf.group_arg);
339 /* parse config file, open log and set defaults */
341 log_welcome("para_server", conf.loglevel_arg);
342 shm_init(); /* init mmd struct */
343 server_uptime(UPTIME_SET); /* reset server uptime */
344 init_user_list(user_list_file);
346 if (conf.daemon_given)
349 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
350 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
353 mmd->server_pid = getpid();
354 setup_signal_handling();
357 /* init network socket */
358 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
359 sockfd = init_network();
360 PARA_NOTICE_LOG("%s", "init complete\n");
365 * called when server gets SIGHUP or when client invokes hup command.
367 static void handle_sighup(void)
369 PARA_NOTICE_LOG("%s", "SIGHUP\n");
370 close_log(logfile); /* gets reopened if necessary by parse_config */
372 parse_config(1); /* reopens log */
373 init_user_list(user_list_file); /* reload user list */
375 kill(afs_pid, SIGHUP);
378 static void status_refresh(void)
380 static int prev_uptime = -1, prev_events = -1;
381 int uptime = server_uptime(UPTIME_GET), ret = 1;
383 if (prev_events != mmd->events)
385 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
387 if (uptime / 60 != prev_uptime / 60)
391 prev_uptime = uptime;
392 prev_events = mmd->events;
393 mmd->vss_status_flags = mmd->new_vss_status_flags;
395 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
396 mmd->events, mmd->audio_format);
402 * the main function of para_server
404 * \param argc usual argument count
405 * \param argv usual argument vector
407 * \return EXIT_SUCCESS or EXIT_FAILURE
410 int main(int argc, char *argv[])
412 /* listen on sock_fd, new connection on new_fd */
414 struct sockaddr_in their_addr;
415 int i, max_fileno, ret;
418 struct timeval *timeout;
421 sockfd = do_inits(argc, argv);
426 /* check socket and signal pipe in any case */
427 para_fd_set(sockfd, &rfds, &max_fileno);
428 para_fd_set(signal_pipe, &rfds, &max_fileno);
429 timeout = vss_preselect(&rfds, &wfds, &max_fileno);
431 for (i = 0; senders[i].name; i++) {
432 if (senders[i].status != SENDER_ON)
434 if (!senders[i].pre_select)
436 senders[i].pre_select(&max_fileno, &rfds, &wfds);
439 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
441 vss_post_select(&rfds, &wfds);
444 for (i = 0; senders[i].name; i++) {
445 if (senders[i].status != SENDER_ON)
447 if (!senders[i].post_select)
449 senders[i].post_select(&rfds, &wfds);
453 if (FD_ISSET(signal_pipe, &rfds)) {
456 sig = para_next_signal();
463 ret = para_reap_child(&pid);
468 PARA_EMERG_LOG("fatal: afs died\n");
472 /* die on sigint/sigterm. Kill all children too. */
475 PARA_EMERG_LOG("terminating on signal %d\n", sig);
478 mutex_destroy(mmd_mutex);
480 shm_destroy(mmd_shm_id);
485 if (mmd->sender_cmd_data.cmd_num >= 0) {
486 int num = mmd->sender_cmd_data.cmd_num,
487 s = mmd->sender_cmd_data.sender_num;
489 if (senders[s].client_cmds[num])
490 senders[s].client_cmds[num](&mmd->sender_cmd_data);
491 mmd->sender_cmd_data.cmd_num = -1;
493 if (!FD_ISSET(sockfd, &rfds))
496 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
499 PARA_INFO_LOG("got connection from %s, forking\n",
500 inet_ntoa(their_addr.sin_addr));
502 mmd->active_connections++;
506 PARA_CRIT_LOG("%s", "fork failed\n");
511 /* parent keeps accepting connections */
514 alarm(ALARM_TIMEOUT);
516 close(sockfd); /* child doesn't need the listener */
518 * put info on who we are serving into argv[0] to make
519 * client ip visible in top/ps
521 for (i = argc - 1; i >= 0; i--)
522 memset(argv[i], 0, strlen(argv[i]));
523 sprintf(argv[0], "para_server (serving %s)",
524 inet_ntoa(their_addr.sin_addr));
525 return handle_connect(new_fd, &their_addr);