2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file server.c Paraslash's main server */
22 /** \mainpage Paraslash API Reference
24 * Good starting points for reading are probably \ref audio_file_selector,
25 * \ref sender, \ref receiver, \ref receiver_node, \ref filter, \ref
32 #include "server.cmdline.h"
37 #include "close_on_fork.h"
45 /** define the array of error lists needed by para_server */
48 /** shut down non-authorized connections after that many seconds */
49 #define ALARM_TIMEOUT 10
51 /* these are exported to afs.c. command.c and to all selectors */
52 struct misc_meta_data
*mmd
;
53 /** the configuration of para_server
55 * It also contains the options for all audio file selectors and all supported
58 struct gengetopt_args_info conf
;
59 char *user_list
= NULL
;
60 extern void dccp_send_init(struct sender
*);
61 extern void http_send_init(struct sender
*);
62 extern void ortp_send_init(struct sender
*);
63 extern struct audio_format afl
[];
65 /** the list of supported audio file selectors */
66 struct audio_file_selector dblist
[] = {
69 .init
= random_selector_init
,
70 .update_audio_file
= NULL
,
74 .init
= playlist_selector_init
,
75 .update_audio_file
= NULL
,
82 .init
= mysql_selector_init
,
83 .update_audio_file
= NULL
,
93 /** the list of supported senders */
94 struct sender senders
[] = {
97 .init
= http_send_init
,
101 .init
= dccp_send_init
,
106 .init
= ortp_send_init
,
115 /* global variables for server-internal use */
116 static FILE *logfile
;
117 static int mmd_mutex
, mmd_shm_id
;
118 static int signal_pipe
;
121 * para_server's log function
123 * \param ll the log level
124 * \param fmt the format string describing the log message
126 void para_log(int ll
, char* fmt
,...)
132 char str
[MAXLINE
] = "";
135 if (ll
< conf
.loglevel_arg
)
144 if (conf
.daemon_given
&& !logfile
)
148 strftime(str
, MAXLINE
, "%b %d %H:%M:%S", tm
);
149 fprintf(outfd
, "%s ", str
);
150 if (conf
.loglevel_arg
<= INFO
)
151 fprintf(outfd
, "%i: ", ll
);
153 if (conf
.loglevel_arg
<= INFO
)
154 fprintf(outfd
, "(%d) ", mypid
);
156 vfprintf(outfd
, fmt
, argp
);
161 * setup shared memory area and get mutex for locking
163 static void shm_init(void)
166 int ret
= shm_new(sizeof(struct misc_meta_data
));
171 ret
= shm_attach(ret
, ATTACH_RW
, &shm
);
182 mmd
->selector_num
= 0;
184 mmd
->num_commands
= 0;
186 mmd
->num_connects
= 0;
187 mmd
->active_connections
= 0;
188 strcpy(mmd
->filename
, "(none)");
189 mmd
->audio_format
= -1;
190 mmd
->afs_status_flags
= AFS_NEXT
;
191 mmd
->new_afs_status_flags
= AFS_NEXT
;
192 mmd
->sender_cmd_data
.cmd_num
= -1;
195 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret
));
200 * lock the shared memory area containing the mmd struct
202 * \sa semop(2), struct misc_meta_data
206 mutex_lock(mmd_mutex
);
210 * unlock the shared memory area containing the mmd struct
212 * \sa semop(2), struct misc_meta_data
215 void mmd_unlock(void)
217 mutex_unlock(mmd_mutex
);
220 static void parse_config(int override
)
222 char *home
= para_homedir();
227 if (conf
.config_file_given
)
228 cf
= conf
.config_file_arg
;
230 cf
= make_message("%s/.paraslash/server.conf", home
);
232 if (!conf
.user_list_given
)
233 user_list
= make_message("%s/.paraslash/server.users", home
);
235 user_list
= para_strdup(conf
.user_list_arg
);
236 ret
= stat(cf
, &statbuf
);
237 if (ret
&& conf
.config_file_given
) {
239 PARA_EMERG_LOG("can not stat config file %s\n", cf
);
243 int tmp
= conf
.daemon_given
;
244 cmdline_parser_configfile(cf
, &conf
, override
, 0, 0);
245 conf
.daemon_given
= tmp
;
248 if (!conf
.logfile_given
&& conf
.daemon_given
) {
250 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
253 if (conf
.logfile_given
)
254 logfile
= open_log(conf
.logfile_arg
);
266 static void setup_signal_handling(void)
270 signal_pipe
= para_signal_init();
271 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
272 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
273 ret
+= para_install_sighandler(SIGINT
);
274 ret
+= para_install_sighandler(SIGTERM
);
275 ret
+= para_install_sighandler(SIGHUP
);
276 ret
+= para_install_sighandler(SIGCHLD
);
277 ret
+= para_install_sighandler(SIGUSR1
);
278 signal(SIGPIPE
, SIG_IGN
);
280 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
285 static void init_selector(void)
289 mmd
->selector_change
= -1; /* no change nec., set to new num by com_chs */
290 if (!conf
.selector_given
)
292 for (i
= 0; dblist
[i
].name
; i
++) {
293 if (strcmp(dblist
[i
].name
, conf
.selector_arg
))
295 PARA_NOTICE_LOG("initializing %s audio file selector\n",
297 ret
= dblist
[i
].init(&dblist
[i
]);
299 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret
));
302 mmd
->selector_num
= i
;
305 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
307 mmd
->selector_num
= 0;
308 dblist
[0].init(&dblist
[0]); /* always successful */
311 static unsigned init_network(void)
313 int sockfd
= init_tcp_socket(conf
.port_arg
);
320 static void init_random_seed(void)
322 int fd
, ret
= -1, len
= sizeof(unsigned int);
325 fd
= open("/dev/urandom", O_RDONLY
);
329 if (read(fd
, &seed
, len
) != len
)
338 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
343 static unsigned do_inits(int argc
, char **argv
)
345 /* connector's address information */
349 /* parse command line options */
350 cmdline_parser(argc
, argv
, &conf
);
351 para_drop_privileges(conf
.user_arg
);
352 /* parse config file, open log and set defaults */
354 log_welcome("para_server", conf
.loglevel_arg
);
355 shm_init(); /* init mmd struct */
356 server_uptime(UPTIME_SET
); /* reset server uptime */
358 if (conf
.daemon_given
)
361 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
362 /* audio file sender */
364 mmd
->server_pid
= getpid();
365 setup_signal_handling();
367 /* init network socket */
368 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
369 sockfd
= init_network();
370 if (conf
.autoplay_given
) {
371 mmd
->afs_status_flags
|= AFS_PLAYING
;
372 mmd
->new_afs_status_flags
|= AFS_PLAYING
;
374 PARA_NOTICE_LOG("%s", "init complete\n");
378 static void change_selector(void)
380 int ret
, old
= mmd
->selector_num
, new = mmd
->selector_change
;
382 dblist
[old
].shutdown();
383 ret
= dblist
[new].init(&dblist
[new]);
384 mmd
->selector_change
= -1; /* reset */
386 mmd
->selector_num
= new;
390 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret
));
391 dblist
[0].init(&dblist
[0]);
392 mmd
->selector_num
= 0;
396 * called when server gets SIGHUP or when client invokes hup command.
398 static void handle_sighup(void)
400 PARA_NOTICE_LOG("%s", "SIGHUP\n");
401 close_log(logfile
); /* gets reopened if necessary by parse_config */
403 parse_config(1); /* reopens log */
404 mmd
->selector_change
= mmd
->selector_num
; /* do not change selector.. */
405 change_selector(); /* .. just reload */
408 static void status_refresh(void)
410 static int prev_uptime
= -1, prev_events
= -1;
411 int uptime
= server_uptime(UPTIME_GET
), ret
= 1;
413 if (prev_events
!= mmd
->events
)
415 if (mmd
->new_afs_status_flags
!= mmd
->afs_status_flags
)
417 if (uptime
/ 60 != prev_uptime
/ 60)
421 prev_uptime
= uptime
;
422 prev_events
= mmd
->events
;
423 mmd
->afs_status_flags
= mmd
->new_afs_status_flags
;
425 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
426 mmd
->events
, mmd
->audio_format
);
434 int main(int argc
, char *argv
[])
436 /* listen on sock_fd, new connection on new_fd */
438 struct sockaddr_in their_addr
;
439 int err
, i
, max_fileno
, ret
;
442 struct timeval
*timeout
;
445 sockfd
= do_inits(argc
, argv
);
447 /* check socket and signal pipe in any case */
450 FD_SET(sockfd
, &rfds
);
452 FD_SET(signal_pipe
, &rfds
);
453 max_fileno
= MAX(max_fileno
, signal_pipe
);
455 timeout
= afs_preselect();
457 for (i
= 0; senders
[i
].name
; i
++) {
458 if (senders
[i
].status
!= SENDER_ON
)
460 if (!senders
[i
].pre_select
)
462 senders
[i
].pre_select(mmd
->audio_format
>= 0?
463 &afl
[mmd
->audio_format
] : NULL
,
467 if (dblist
[mmd
->selector_num
].pre_select
) {
468 ret
= dblist
[mmd
->selector_num
].pre_select(&rfds
, &wfds
);
469 max_fileno
= MAX(max_fileno
, ret
);
472 // PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
473 ret
= select(max_fileno
+ 1, &rfds
, &wfds
, NULL
, timeout
);
475 //PARA_DEBUG_LOG("%s: select returned %i\n", __func__, ret);
477 if (mmd
->selector_change
>= 0)
479 if (dblist
[mmd
->selector_num
].post_select
)
480 dblist
[mmd
->selector_num
].post_select(&rfds
, &wfds
);
481 if (ret
< 0 && err
== EINTR
)
484 PARA_CRIT_LOG("select error (%s)\n", strerror(err
));
487 for (i
= 0; senders
[i
].name
; i
++) {
488 if (senders
[i
].status
!= SENDER_ON
)
490 if (!senders
[i
].post_select
)
492 senders
[i
].post_select(mmd
->audio_format
>= 0?
493 &afl
[mmd
->audio_format
] : NULL
,
500 if (FD_ISSET(signal_pipe
, &rfds
)) {
502 sig
= para_next_signal();
508 para_reap_children();
510 /* die on sigint/sigterm. Kill all children too. */
513 PARA_EMERG_LOG("terminating on signal %d\n", sig
);
515 dblist
[mmd
->selector_num
].shutdown();
516 mutex_destroy(mmd_mutex
);
518 shm_destroy(mmd_shm_id
);
522 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
523 int num
= mmd
->sender_cmd_data
.cmd_num
,
524 s
= mmd
->sender_cmd_data
.sender_num
;
526 if (senders
[s
].client_cmds
[num
])
527 senders
[s
].client_cmds
[num
](&mmd
->sender_cmd_data
);
528 mmd
->sender_cmd_data
.cmd_num
= -1;
530 if (!FD_ISSET(sockfd
, &rfds
))
533 new_fd
= para_accept(sockfd
, &their_addr
, sizeof(struct sockaddr_in
));
536 PARA_INFO_LOG("got connection from %s, forking\n",
537 inet_ntoa(their_addr
.sin_addr
));
539 mmd
->active_connections
++;
543 PARA_CRIT_LOG("%s", "fork failed\n");
548 /* parent keeps accepting connections */
551 alarm(ALARM_TIMEOUT
);
553 close(sockfd
); /* child doesn't need the listener */
555 * put info on who we are serving into argv[0] to make
556 * client ip visible in top/ps
558 for (i
= argc
- 1; i
>= 0; i
--)
559 memset(argv
[i
], 0, strlen(argv
[i
]));
560 sprintf(argv
[0], "para_server (serving %s)",
561 inet_ntoa(their_addr
.sin_addr
));
562 return handle_connect(new_fd
, &their_addr
);