2 * Copyright (C) 1997-2007 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 #include "user_list.h"
48 /** define the array of error lists needed by para_server */
51 /** shut down non-authorized connections after that many seconds */
52 #define ALARM_TIMEOUT 10
55 * pointer to shared memory area for communication between para_server
56 * and its children. exported to vss.c. command.c and to all selectors.
58 struct misc_meta_data
*mmd
;
61 * the configuration of para_server
63 * It also contains the options for all audio file selectors, audio format handler
64 * and all supported senders.
66 struct server_args_info conf
;
68 /** the file containing user information (public key, permissions) */
69 char *user_list_file
= NULL
;
71 extern void dccp_send_init(struct sender
*);
72 extern void http_send_init(struct sender
*);
73 extern void ortp_send_init(struct sender
*);
75 /* TODO: This is better handled by autoconf */
76 /** the list of supported audio file selectors */
77 struct audio_file_selector selectors
[] = {
80 .init
= random_selector_init
,
81 .update_audio_file
= NULL
,
85 .init
= playlist_selector_init
,
86 .update_audio_file
= NULL
,
93 .init
= mysql_selector_init
,
94 .update_audio_file
= NULL
,
104 /** the list of supported senders */
105 struct sender senders
[] = {
108 .init
= http_send_init
,
112 .init
= dccp_send_init
,
117 .init
= ortp_send_init
,
126 /* global variables for server-internal use */
127 static FILE *logfile
;
128 static int mmd_mutex
, mmd_shm_id
;
129 static int signal_pipe
;
132 * para_server's log function
134 * \param ll the log level
135 * \param fmt the format string describing the log message
137 void para_log(int ll
, const char* fmt
,...)
143 char str
[MAXLINE
] = "";
146 if (ll
< conf
.loglevel_arg
)
148 outfd
= logfile
? logfile
: stderr
;
151 strftime(str
, MAXLINE
, "%b %d %H:%M:%S", tm
);
152 fprintf(outfd
, "%s ", str
);
153 if (conf
.loglevel_arg
<= INFO
)
154 fprintf(outfd
, "%i: ", ll
);
156 if (conf
.loglevel_arg
<= INFO
)
157 fprintf(outfd
, "(%d) ", mypid
);
159 vfprintf(outfd
, fmt
, argp
);
164 * setup shared memory area and get mutex for locking
166 static void shm_init(void)
169 int ret
= shm_new(sizeof(struct misc_meta_data
));
174 ret
= shm_attach(ret
, ATTACH_RW
, &shm
);
185 mmd
->selector_num
= 0;
187 mmd
->num_commands
= 0;
189 mmd
->num_connects
= 0;
190 mmd
->active_connections
= 0;
191 strcpy(mmd
->filename
, "(none)");
192 mmd
->audio_format
= -1;
193 mmd
->vss_status_flags
= VSS_NEXT
;
194 mmd
->new_vss_status_flags
= VSS_NEXT
;
195 mmd
->sender_cmd_data
.cmd_num
= -1;
198 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret
));
203 * lock the shared memory area containing the mmd struct
205 * \sa semop(2), struct misc_meta_data
209 mutex_lock(mmd_mutex
);
213 * unlock the shared memory area containing the mmd struct
215 * \sa semop(2), struct misc_meta_data
218 void mmd_unlock(void)
220 mutex_unlock(mmd_mutex
);
223 static void parse_config(int override
)
225 char *home
= para_homedir();
230 if (conf
.config_file_given
)
231 cf
= conf
.config_file_arg
;
233 cf
= make_message("%s/.paraslash/server.conf", home
);
234 free(user_list_file
);
235 if (!conf
.user_list_given
)
236 user_list_file
= make_message("%s/.paraslash/server.users", home
);
238 user_list_file
= para_strdup(conf
.user_list_arg
);
239 ret
= stat(cf
, &statbuf
);
240 if (ret
&& conf
.config_file_given
) {
242 PARA_EMERG_LOG("can not stat config file %s\n", cf
);
246 int tmp
= conf
.daemon_given
;
247 server_cmdline_parser_configfile(cf
, &conf
, override
, 0, 0);
248 conf
.daemon_given
= tmp
;
251 if (!conf
.logfile_given
&& conf
.daemon_given
) {
253 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
256 if (conf
.logfile_given
)
257 logfile
= open_log(conf
.logfile_arg
);
264 free(user_list_file
);
265 user_list_file
= NULL
;
269 static void setup_signal_handling(void)
273 signal_pipe
= para_signal_init();
274 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
275 ret
+= para_install_sighandler(SIGINT
);
276 ret
+= para_install_sighandler(SIGTERM
);
277 ret
+= para_install_sighandler(SIGHUP
);
278 ret
+= para_install_sighandler(SIGCHLD
);
279 ret
+= para_install_sighandler(SIGUSR1
);
280 signal(SIGPIPE
, SIG_IGN
);
282 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
287 static void init_selector(void)
291 mmd
->selector_change
= -1; /* no change nec., set to new num by com_chs */
292 if (!conf
.selector_given
)
294 for (i
= 0; selectors
[i
].name
; i
++) {
295 if (strcmp(selectors
[i
].name
, conf
.selector_arg
))
297 PARA_NOTICE_LOG("initializing %s audio file selector\n",
299 ret
= selectors
[i
].init(&selectors
[i
]);
301 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret
));
304 mmd
->selector_num
= i
;
307 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
309 mmd
->selector_num
= 0;
310 selectors
[0].init(&selectors
[0]); /* always successful */
313 static unsigned init_network(void)
315 int fd
, ret
= init_tcp_socket(conf
.port_arg
);
320 ret
= mark_fd_nonblock(fd
);
325 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
329 static void init_random_seed(void)
333 size_t len
= sizeof(unsigned int);
335 fd
= open("/dev/urandom", O_RDONLY
);
339 if (read(fd
, &seed
, len
) != len
)
348 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
353 static unsigned do_inits(int argc
, char **argv
)
355 /* connector's address information */
359 /* parse command line options */
360 server_cmdline_parser(argc
, argv
, &conf
);
361 HANDLE_VERSION_FLAG("server", conf
);
362 para_drop_privileges(conf
.user_arg
, conf
.group_arg
);
363 /* parse config file, open log and set defaults */
365 log_welcome("para_server", conf
.loglevel_arg
);
366 shm_init(); /* init mmd struct */
367 server_uptime(UPTIME_SET
); /* reset server uptime */
368 init_user_list(user_list_file
);
370 if (conf
.daemon_given
)
373 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
374 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
376 mmd
->server_pid
= getpid();
377 setup_signal_handling();
379 /* init network socket */
380 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
381 sockfd
= init_network();
382 PARA_NOTICE_LOG("%s", "init complete\n");
386 static void change_selector(void)
388 int ret
, old
= mmd
->selector_num
, new = mmd
->selector_change
;
390 selectors
[old
].shutdown();
391 ret
= selectors
[new].init(&selectors
[new]);
392 mmd
->selector_change
= -1; /* reset */
394 mmd
->selector_num
= new;
398 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret
));
399 selectors
[0].init(&selectors
[0]);
400 mmd
->selector_num
= 0;
404 * called when server gets SIGHUP or when client invokes hup command.
406 static void handle_sighup(void)
408 PARA_NOTICE_LOG("%s", "SIGHUP\n");
409 close_log(logfile
); /* gets reopened if necessary by parse_config */
411 parse_config(1); /* reopens log */
412 mmd
->selector_change
= mmd
->selector_num
; /* do not change selector.. */
413 change_selector(); /* .. just reload */
414 init_user_list(user_list_file
); /* reload user list */
417 static void status_refresh(void)
419 static int prev_uptime
= -1, prev_events
= -1;
420 int uptime
= server_uptime(UPTIME_GET
), ret
= 1;
422 if (prev_events
!= mmd
->events
)
424 if (mmd
->new_vss_status_flags
!= mmd
->vss_status_flags
)
426 if (uptime
/ 60 != prev_uptime
/ 60)
430 prev_uptime
= uptime
;
431 prev_events
= mmd
->events
;
432 mmd
->vss_status_flags
= mmd
->new_vss_status_flags
;
434 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
435 mmd
->events
, mmd
->audio_format
);
441 * the main function of para_server
443 * \param argc usual argument count
444 * \param argv usual argument vector
446 * \return EXIT_SUCCESS or EXIT_FAILURE
449 int main(int argc
, char *argv
[])
451 /* listen on sock_fd, new connection on new_fd */
453 struct sockaddr_in their_addr
;
454 int i
, max_fileno
, ret
;
457 struct timeval
*timeout
;
460 sockfd
= do_inits(argc
, argv
);
465 /* check socket and signal pipe in any case */
466 para_fd_set(sockfd
, &rfds
, &max_fileno
);
467 para_fd_set(signal_pipe
, &rfds
, &max_fileno
);
468 timeout
= vss_preselect();
470 for (i
= 0; senders
[i
].name
; i
++) {
471 if (senders
[i
].status
!= SENDER_ON
)
473 if (!senders
[i
].pre_select
)
475 senders
[i
].pre_select( &max_fileno
, &rfds
, &wfds
);
477 if (selectors
[mmd
->selector_num
].pre_select
) {
478 ret
= selectors
[mmd
->selector_num
].pre_select(&rfds
, &wfds
);
479 max_fileno
= PARA_MAX(max_fileno
, ret
);
482 ret
= para_select(max_fileno
+ 1, &rfds
, &wfds
, timeout
);
484 if (mmd
->selector_change
>= 0)
486 if (selectors
[mmd
->selector_num
].post_select
)
487 selectors
[mmd
->selector_num
].post_select(&rfds
, &wfds
);
490 for (i
= 0; senders
[i
].name
; i
++) {
491 if (senders
[i
].status
!= SENDER_ON
)
493 if (!senders
[i
].post_select
)
495 senders
[i
].post_select(&rfds
, &wfds
);
499 if (FD_ISSET(signal_pipe
, &rfds
)) {
501 sig
= para_next_signal();
507 para_reap_children();
509 /* die on sigint/sigterm. Kill all children too. */
512 PARA_EMERG_LOG("terminating on signal %d\n", sig
);
514 selectors
[mmd
->selector_num
].shutdown();
515 mutex_destroy(mmd_mutex
);
517 shm_destroy(mmd_shm_id
);
521 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
522 int num
= mmd
->sender_cmd_data
.cmd_num
,
523 s
= mmd
->sender_cmd_data
.sender_num
;
525 if (senders
[s
].client_cmds
[num
])
526 senders
[s
].client_cmds
[num
](&mmd
->sender_cmd_data
);
527 mmd
->sender_cmd_data
.cmd_num
= -1;
529 if (!FD_ISSET(sockfd
, &rfds
))
532 new_fd
= para_accept(sockfd
, &their_addr
, sizeof(struct sockaddr_in
));
535 PARA_INFO_LOG("got connection from %s, forking\n",
536 inet_ntoa(their_addr
.sin_addr
));
538 mmd
->active_connections
++;
542 PARA_CRIT_LOG("%s", "fork failed\n");
547 /* parent keeps accepting connections */
550 alarm(ALARM_TIMEOUT
);
552 close(sockfd
); /* child doesn't need the listener */
554 * put info on who we are serving into argv[0] to make
555 * client ip visible in top/ps
557 for (i
= argc
- 1; i
>= 0; i
--)
558 memset(argv
[i
], 0, strlen(argv
[i
]));
559 sprintf(argv
[0], "para_server (serving %s)",
560 inet_ntoa(their_addr
.sin_addr
));
561 return handle_connect(new_fd
, &their_addr
);