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"
46 /** define the array of error lists needed by para_server */
49 /** shut down non-authorized connections after that many seconds */
50 #define ALARM_TIMEOUT 10
52 /* these are exported to afs.c. command.c and to all selectors */
53 struct misc_meta_data
*mmd
;
54 /** the configuration of para_server
56 * It also contains the options for all audio file selectors and all supported
59 struct gengetopt_args_info conf
;
60 char *user_list
= NULL
;
61 extern void dccp_send_init(struct sender
*);
62 extern void http_send_init(struct sender
*);
63 extern void ortp_send_init(struct sender
*);
64 extern struct audio_format afl
[];
66 /** the list of supported audio file selectors */
67 struct audio_file_selector selectors
[] = {
70 .init
= random_selector_init
,
71 .update_audio_file
= NULL
,
75 .init
= playlist_selector_init
,
76 .update_audio_file
= NULL
,
83 .init
= mysql_selector_init
,
84 .update_audio_file
= NULL
,
94 /** the list of supported senders */
95 struct sender senders
[] = {
98 .init
= http_send_init
,
102 .init
= dccp_send_init
,
107 .init
= ortp_send_init
,
116 /* global variables for server-internal use */
117 static FILE *logfile
;
118 static int mmd_mutex
, mmd_shm_id
;
119 static int signal_pipe
;
122 * para_server's log function
124 * \param ll the log level
125 * \param fmt the format string describing the log message
127 void para_log(int ll
, const char* fmt
,...)
133 char str
[MAXLINE
] = "";
136 if (ll
< conf
.loglevel_arg
)
145 if (conf
.daemon_given
&& !logfile
)
149 strftime(str
, MAXLINE
, "%b %d %H:%M:%S", tm
);
150 fprintf(outfd
, "%s ", str
);
151 if (conf
.loglevel_arg
<= INFO
)
152 fprintf(outfd
, "%i: ", ll
);
154 if (conf
.loglevel_arg
<= INFO
)
155 fprintf(outfd
, "(%d) ", mypid
);
157 vfprintf(outfd
, fmt
, argp
);
162 * setup shared memory area and get mutex for locking
164 static void shm_init(void)
167 int ret
= shm_new(sizeof(struct misc_meta_data
));
172 ret
= shm_attach(ret
, ATTACH_RW
, &shm
);
183 mmd
->selector_num
= 0;
185 mmd
->num_commands
= 0;
187 mmd
->num_connects
= 0;
188 mmd
->active_connections
= 0;
189 strcpy(mmd
->filename
, "(none)");
190 mmd
->audio_format
= -1;
191 mmd
->afs_status_flags
= AFS_NEXT
;
192 mmd
->new_afs_status_flags
= AFS_NEXT
;
193 mmd
->sender_cmd_data
.cmd_num
= -1;
196 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret
));
201 * lock the shared memory area containing the mmd struct
203 * \sa semop(2), struct misc_meta_data
207 mutex_lock(mmd_mutex
);
211 * unlock the shared memory area containing the mmd struct
213 * \sa semop(2), struct misc_meta_data
216 void mmd_unlock(void)
218 mutex_unlock(mmd_mutex
);
221 static void parse_config(int override
)
223 char *home
= para_homedir();
228 if (conf
.config_file_given
)
229 cf
= conf
.config_file_arg
;
231 cf
= make_message("%s/.paraslash/server.conf", home
);
233 if (!conf
.user_list_given
)
234 user_list
= make_message("%s/.paraslash/server.users", home
);
236 user_list
= para_strdup(conf
.user_list_arg
);
237 ret
= stat(cf
, &statbuf
);
238 if (ret
&& conf
.config_file_given
) {
240 PARA_EMERG_LOG("can not stat config file %s\n", cf
);
244 int tmp
= conf
.daemon_given
;
245 cmdline_parser_configfile(cf
, &conf
, override
, 0, 0);
246 conf
.daemon_given
= tmp
;
249 if (!conf
.logfile_given
&& conf
.daemon_given
) {
251 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
254 if (conf
.logfile_given
)
255 logfile
= open_log(conf
.logfile_arg
);
267 static void setup_signal_handling(void)
271 signal_pipe
= para_signal_init();
272 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
273 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
274 ret
+= para_install_sighandler(SIGINT
);
275 ret
+= para_install_sighandler(SIGTERM
);
276 ret
+= para_install_sighandler(SIGHUP
);
277 ret
+= para_install_sighandler(SIGCHLD
);
278 ret
+= para_install_sighandler(SIGUSR1
);
279 signal(SIGPIPE
, SIG_IGN
);
281 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
286 static void init_selector(void)
290 mmd
->selector_change
= -1; /* no change nec., set to new num by com_chs */
291 if (!conf
.selector_given
)
293 for (i
= 0; selectors
[i
].name
; i
++) {
294 if (strcmp(selectors
[i
].name
, conf
.selector_arg
))
296 PARA_NOTICE_LOG("initializing %s audio file selector\n",
298 ret
= selectors
[i
].init(&selectors
[i
]);
300 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret
));
303 mmd
->selector_num
= i
;
306 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
308 mmd
->selector_num
= 0;
309 selectors
[0].init(&selectors
[0]); /* always successful */
312 static unsigned init_network(void)
314 int sockfd
= init_tcp_socket(conf
.port_arg
);
321 static void init_random_seed(void)
323 int fd
, ret
= -1, len
= sizeof(unsigned int);
326 fd
= open("/dev/urandom", O_RDONLY
);
330 if (read(fd
, &seed
, len
) != len
)
339 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
344 static unsigned do_inits(int argc
, char **argv
)
346 /* connector's address information */
350 /* parse command line options */
351 cmdline_parser(argc
, argv
, &conf
);
352 para_drop_privileges(conf
.user_arg
);
353 /* parse config file, open log and set defaults */
355 log_welcome("para_server", conf
.loglevel_arg
);
356 shm_init(); /* init mmd struct */
357 server_uptime(UPTIME_SET
); /* reset server uptime */
359 if (conf
.daemon_given
)
362 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
363 /* audio file sender */
365 mmd
->server_pid
= getpid();
366 setup_signal_handling();
368 /* init network socket */
369 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
370 sockfd
= init_network();
371 if (conf
.autoplay_given
) {
372 mmd
->afs_status_flags
|= AFS_PLAYING
;
373 mmd
->new_afs_status_flags
|= AFS_PLAYING
;
375 PARA_NOTICE_LOG("%s", "init complete\n");
379 static void change_selector(void)
381 int ret
, old
= mmd
->selector_num
, new = mmd
->selector_change
;
383 selectors
[old
].shutdown();
384 ret
= selectors
[new].init(&selectors
[new]);
385 mmd
->selector_change
= -1; /* reset */
387 mmd
->selector_num
= new;
391 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret
));
392 selectors
[0].init(&selectors
[0]);
393 mmd
->selector_num
= 0;
397 * called when server gets SIGHUP or when client invokes hup command.
399 static void handle_sighup(void)
401 PARA_NOTICE_LOG("%s", "SIGHUP\n");
402 close_log(logfile
); /* gets reopened if necessary by parse_config */
404 parse_config(1); /* reopens log */
405 mmd
->selector_change
= mmd
->selector_num
; /* do not change selector.. */
406 change_selector(); /* .. just reload */
409 static void status_refresh(void)
411 static int prev_uptime
= -1, prev_events
= -1;
412 int uptime
= server_uptime(UPTIME_GET
), ret
= 1;
414 if (prev_events
!= mmd
->events
)
416 if (mmd
->new_afs_status_flags
!= mmd
->afs_status_flags
)
418 if (uptime
/ 60 != prev_uptime
/ 60)
422 prev_uptime
= uptime
;
423 prev_events
= mmd
->events
;
424 mmd
->afs_status_flags
= mmd
->new_afs_status_flags
;
426 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
427 mmd
->events
, mmd
->audio_format
);
435 int main(int argc
, char *argv
[])
437 /* listen on sock_fd, new connection on new_fd */
439 struct sockaddr_in their_addr
;
440 int i
, max_fileno
, ret
;
443 struct timeval
*timeout
;
446 sockfd
= do_inits(argc
, argv
);
448 /* check socket and signal pipe in any case */
451 FD_SET(sockfd
, &rfds
);
453 FD_SET(signal_pipe
, &rfds
);
454 max_fileno
= MAX(max_fileno
, signal_pipe
);
456 timeout
= afs_preselect();
458 for (i
= 0; senders
[i
].name
; i
++) {
459 if (senders
[i
].status
!= SENDER_ON
)
461 if (!senders
[i
].pre_select
)
463 senders
[i
].pre_select(mmd
->audio_format
>= 0?
464 &afl
[mmd
->audio_format
] : NULL
,
468 if (selectors
[mmd
->selector_num
].pre_select
) {
469 ret
= selectors
[mmd
->selector_num
].pre_select(&rfds
, &wfds
);
470 max_fileno
= MAX(max_fileno
, ret
);
473 ret
= para_select(max_fileno
+ 1, &rfds
, &wfds
, timeout
);
475 if (mmd
->selector_change
>= 0)
477 if (selectors
[mmd
->selector_num
].post_select
)
478 selectors
[mmd
->selector_num
].post_select(&rfds
, &wfds
);
481 for (i
= 0; senders
[i
].name
; i
++) {
482 if (senders
[i
].status
!= SENDER_ON
)
484 if (!senders
[i
].post_select
)
486 senders
[i
].post_select(mmd
->audio_format
>= 0?
487 &afl
[mmd
->audio_format
] : NULL
,
494 if (FD_ISSET(signal_pipe
, &rfds
)) {
496 sig
= para_next_signal();
502 para_reap_children();
504 /* die on sigint/sigterm. Kill all children too. */
507 PARA_EMERG_LOG("terminating on signal %d\n", sig
);
509 selectors
[mmd
->selector_num
].shutdown();
510 mutex_destroy(mmd_mutex
);
512 shm_destroy(mmd_shm_id
);
516 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
517 int num
= mmd
->sender_cmd_data
.cmd_num
,
518 s
= mmd
->sender_cmd_data
.sender_num
;
520 if (senders
[s
].client_cmds
[num
])
521 senders
[s
].client_cmds
[num
](&mmd
->sender_cmd_data
);
522 mmd
->sender_cmd_data
.cmd_num
= -1;
524 if (!FD_ISSET(sockfd
, &rfds
))
527 new_fd
= para_accept(sockfd
, &their_addr
, sizeof(struct sockaddr_in
));
530 PARA_INFO_LOG("got connection from %s, forking\n",
531 inet_ntoa(their_addr
.sin_addr
));
533 mmd
->active_connections
++;
537 PARA_CRIT_LOG("%s", "fork failed\n");
542 /* parent keeps accepting connections */
545 alarm(ALARM_TIMEOUT
);
547 close(sockfd
); /* child doesn't need the listener */
549 * put info on who we are serving into argv[0] to make
550 * client ip visible in top/ps
552 for (i
= argc
- 1; i
>= 0; i
--)
553 memset(argv
[i
], 0, strlen(argv
[i
]));
554 sprintf(argv
[0], "para_server (serving %s)",
555 inet_ntoa(their_addr
.sin_addr
));
556 return handle_connect(new_fd
, &their_addr
);