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
20 #include "server.cmdline.h"
21 #include "afs_common.h"
25 #include "close_on_fork.h"
34 #include "user_list.h"
36 /** define the array of error lists needed by para_server */
39 /** shut down non-authorized connections after that many seconds */
40 #define ALARM_TIMEOUT 10
43 * pointer to shared memory area for communication between para_server
44 * and its children. exported to vss.c. command.c and to all selectors.
46 struct misc_meta_data
*mmd
;
49 * the configuration of para_server
51 * It also contains the options for all audio file selectors, audio format handler
52 * and all supported senders.
54 struct server_args_info conf
;
56 /** the file containing user information (public key, permissions) */
57 char *user_list_file
= NULL
;
59 extern void dccp_send_init(struct sender
*);
60 extern void http_send_init(struct sender
*);
61 extern void ortp_send_init(struct sender
*);
63 /* TODO: This is better handled by autoconf */
64 /** the list of supported audio file selectors */
65 struct audio_file_selector selectors
[] = {
68 .init
= random_selector_init
,
69 .update_audio_file
= NULL
,
73 .init
= playlist_selector_init
,
74 .update_audio_file
= NULL
,
81 .init
= mysql_selector_init
,
82 .update_audio_file
= NULL
,
92 /** the list of supported senders */
93 struct sender senders
[] = {
96 .init
= http_send_init
,
100 .init
= dccp_send_init
,
105 .init
= ortp_send_init
,
114 /* global variables for server-internal use */
115 static FILE *logfile
;
116 static int mmd_mutex
, mmd_shm_id
;
117 static int signal_pipe
;
120 * para_server's log function
122 * \param ll the log level
123 * \param fmt the format string describing the log message
125 void para_log(int ll
, const char* fmt
,...)
131 char str
[MAXLINE
] = "";
134 if (ll
< conf
.loglevel_arg
)
136 outfd
= logfile
? logfile
: stderr
;
139 strftime(str
, MAXLINE
, "%b %d %H:%M:%S", tm
);
140 fprintf(outfd
, "%s ", str
);
141 if (conf
.loglevel_arg
<= INFO
)
142 fprintf(outfd
, "%i: ", ll
);
144 if (conf
.loglevel_arg
<= INFO
)
145 fprintf(outfd
, "(%d) ", mypid
);
147 vfprintf(outfd
, fmt
, argp
);
152 * setup shared memory area and get mutex for locking
154 static void shm_init(void)
157 int ret
= shm_new(sizeof(struct misc_meta_data
));
162 ret
= shm_attach(ret
, ATTACH_RW
, &shm
);
173 mmd
->selector_num
= 0;
175 mmd
->num_commands
= 0;
177 mmd
->num_connects
= 0;
178 mmd
->active_connections
= 0;
179 strcpy(mmd
->filename
, "(none)");
180 mmd
->audio_format
= -1;
181 mmd
->vss_status_flags
= VSS_NEXT
;
182 mmd
->new_vss_status_flags
= VSS_NEXT
;
183 mmd
->sender_cmd_data
.cmd_num
= -1;
186 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret
));
191 * lock the shared memory area containing the mmd struct
193 * \sa semop(2), struct misc_meta_data
197 mutex_lock(mmd_mutex
);
201 * unlock the shared memory area containing the mmd struct
203 * \sa semop(2), struct misc_meta_data
206 void mmd_unlock(void)
208 mutex_unlock(mmd_mutex
);
211 static void parse_config(int override
)
213 char *home
= para_homedir();
218 if (conf
.config_file_given
)
219 cf
= conf
.config_file_arg
;
221 cf
= make_message("%s/.paraslash/server.conf", home
);
222 free(user_list_file
);
223 if (!conf
.user_list_given
)
224 user_list_file
= make_message("%s/.paraslash/server.users", home
);
226 user_list_file
= para_strdup(conf
.user_list_arg
);
227 ret
= stat(cf
, &statbuf
);
228 if (ret
&& conf
.config_file_given
) {
230 PARA_EMERG_LOG("can not stat config file %s\n", cf
);
234 int tmp
= conf
.daemon_given
;
235 struct server_cmdline_parser_params params
= {
236 .override
= override
,
241 server_cmdline_parser_config_file(cf
, &conf
, ¶ms
);
242 conf
.daemon_given
= tmp
;
245 if (!conf
.logfile_given
&& conf
.daemon_given
) {
247 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
250 if (conf
.logfile_given
)
251 logfile
= open_log(conf
.logfile_arg
);
258 free(user_list_file
);
259 user_list_file
= NULL
;
263 static void setup_signal_handling(void)
267 signal_pipe
= para_signal_init();
268 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
269 ret
+= para_install_sighandler(SIGINT
);
270 ret
+= para_install_sighandler(SIGTERM
);
271 ret
+= para_install_sighandler(SIGHUP
);
272 ret
+= para_install_sighandler(SIGCHLD
);
273 ret
+= para_install_sighandler(SIGUSR1
);
274 signal(SIGPIPE
, SIG_IGN
);
276 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
281 static void init_selector(void)
285 mmd
->selector_change
= -1; /* no change nec., set to new num by com_chs */
286 if (!conf
.selector_given
)
288 for (i
= 0; selectors
[i
].name
; i
++) {
289 if (strcmp(selectors
[i
].name
, conf
.selector_arg
))
291 PARA_NOTICE_LOG("initializing %s audio file selector\n",
293 ret
= selectors
[i
].init(&selectors
[i
]);
295 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret
));
298 mmd
->selector_num
= i
;
301 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
303 mmd
->selector_num
= 0;
304 selectors
[0].init(&selectors
[0]); /* always successful */
307 static unsigned init_network(void)
309 int fd
, ret
= init_tcp_socket(conf
.port_arg
);
314 ret
= mark_fd_nonblock(fd
);
319 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
323 static void init_random_seed(void)
327 size_t len
= sizeof(unsigned int);
329 fd
= open("/dev/urandom", O_RDONLY
);
333 if (read(fd
, &seed
, len
) != len
)
342 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
347 static unsigned do_inits(int argc
, char **argv
)
349 /* connector's address information */
353 /* parse command line options */
354 server_cmdline_parser(argc
, argv
, &conf
);
355 HANDLE_VERSION_FLAG("server", conf
);
356 para_drop_privileges(conf
.user_arg
, conf
.group_arg
);
357 /* parse config file, open log and set defaults */
359 log_welcome("para_server", conf
.loglevel_arg
);
360 shm_init(); /* init mmd struct */
361 server_uptime(UPTIME_SET
); /* reset server uptime */
362 init_user_list(user_list_file
);
364 if (conf
.daemon_given
)
367 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
368 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
370 mmd
->server_pid
= getpid();
371 setup_signal_handling();
373 /* init network socket */
374 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
375 sockfd
= init_network();
376 PARA_NOTICE_LOG("%s", "init complete\n");
380 static void change_selector(void)
382 int ret
, old
= mmd
->selector_num
, new = mmd
->selector_change
;
384 selectors
[old
].shutdown();
385 ret
= selectors
[new].init(&selectors
[new]);
386 mmd
->selector_change
= -1; /* reset */
388 mmd
->selector_num
= new;
392 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret
));
393 selectors
[0].init(&selectors
[0]);
394 mmd
->selector_num
= 0;
398 * called when server gets SIGHUP or when client invokes hup command.
400 static void handle_sighup(void)
402 PARA_NOTICE_LOG("%s", "SIGHUP\n");
403 close_log(logfile
); /* gets reopened if necessary by parse_config */
405 parse_config(1); /* reopens log */
406 mmd
->selector_change
= mmd
->selector_num
; /* do not change selector.. */
407 change_selector(); /* .. just reload */
408 init_user_list(user_list_file
); /* reload user list */
411 static void status_refresh(void)
413 static int prev_uptime
= -1, prev_events
= -1;
414 int uptime
= server_uptime(UPTIME_GET
), ret
= 1;
416 if (prev_events
!= mmd
->events
)
418 if (mmd
->new_vss_status_flags
!= mmd
->vss_status_flags
)
420 if (uptime
/ 60 != prev_uptime
/ 60)
424 prev_uptime
= uptime
;
425 prev_events
= mmd
->events
;
426 mmd
->vss_status_flags
= mmd
->new_vss_status_flags
;
428 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
429 mmd
->events
, mmd
->audio_format
);
435 * the main function of para_server
437 * \param argc usual argument count
438 * \param argv usual argument vector
440 * \return EXIT_SUCCESS or EXIT_FAILURE
443 int main(int argc
, char *argv
[])
445 /* listen on sock_fd, new connection on new_fd */
447 struct sockaddr_in their_addr
;
448 int i
, max_fileno
, ret
;
451 struct timeval
*timeout
;
454 sockfd
= do_inits(argc
, argv
);
459 /* check socket and signal pipe in any case */
460 para_fd_set(sockfd
, &rfds
, &max_fileno
);
461 para_fd_set(signal_pipe
, &rfds
, &max_fileno
);
462 timeout
= vss_preselect();
464 for (i
= 0; senders
[i
].name
; i
++) {
465 if (senders
[i
].status
!= SENDER_ON
)
467 if (!senders
[i
].pre_select
)
469 senders
[i
].pre_select( &max_fileno
, &rfds
, &wfds
);
471 if (selectors
[mmd
->selector_num
].pre_select
) {
472 ret
= selectors
[mmd
->selector_num
].pre_select(&rfds
, &wfds
);
473 max_fileno
= PARA_MAX(max_fileno
, ret
);
476 ret
= para_select(max_fileno
+ 1, &rfds
, &wfds
, timeout
);
478 if (mmd
->selector_change
>= 0)
480 if (selectors
[mmd
->selector_num
].post_select
)
481 selectors
[mmd
->selector_num
].post_select(&rfds
, &wfds
);
484 for (i
= 0; senders
[i
].name
; i
++) {
485 if (senders
[i
].status
!= SENDER_ON
)
487 if (!senders
[i
].post_select
)
489 senders
[i
].post_select(&rfds
, &wfds
);
493 if (FD_ISSET(signal_pipe
, &rfds
)) {
495 sig
= para_next_signal();
501 para_reap_children();
503 /* die on sigint/sigterm. Kill all children too. */
506 PARA_EMERG_LOG("terminating on signal %d\n", sig
);
508 selectors
[mmd
->selector_num
].shutdown();
509 mutex_destroy(mmd_mutex
);
511 shm_destroy(mmd_shm_id
);
515 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
516 int num
= mmd
->sender_cmd_data
.cmd_num
,
517 s
= mmd
->sender_cmd_data
.sender_num
;
519 if (senders
[s
].client_cmds
[num
])
520 senders
[s
].client_cmds
[num
](&mmd
->sender_cmd_data
);
521 mmd
->sender_cmd_data
.cmd_num
= -1;
523 if (!FD_ISSET(sockfd
, &rfds
))
526 new_fd
= para_accept(sockfd
, &their_addr
, sizeof(struct sockaddr_in
));
529 PARA_INFO_LOG("got connection from %s, forking\n",
530 inet_ntoa(their_addr
.sin_addr
));
532 mmd
->active_connections
++;
536 PARA_CRIT_LOG("%s", "fork failed\n");
541 /* parent keeps accepting connections */
544 alarm(ALARM_TIMEOUT
);
546 close(sockfd
); /* child doesn't need the listener */
548 * put info on who we are serving into argv[0] to make
549 * client ip visible in top/ps
551 for (i
= argc
- 1; i
>= 0; i
--)
552 memset(argv
[i
], 0, strlen(argv
[i
]));
553 sprintf(argv
[0], "para_server (serving %s)",
554 inet_ntoa(their_addr
.sin_addr
));
555 return handle_connect(new_fd
, &their_addr
);