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"
26 #include "close_on_fork.h"
35 #include "user_list.h"
38 /** define the array of error lists needed by para_server */
41 /** shut down non-authorized connections after that many seconds */
42 #define ALARM_TIMEOUT 10
45 * pointer to shared memory area for communication between para_server
46 * and its children. exported to vss.c. command.c and to all selectors.
48 struct misc_meta_data
*mmd
;
51 * the configuration of para_server
53 * It also contains the options for all audio file selectors, audio format handler
54 * and all supported senders.
56 struct server_args_info conf
;
58 /** the file containing user information (public key, permissions) */
59 char *user_list_file
= 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
*);
65 /* TODO: This is better handled by autoconf */
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
)
138 outfd
= logfile
? logfile
: stderr
;
141 strftime(str
, MAXLINE
, "%b %d %H:%M:%S", tm
);
142 fprintf(outfd
, "%s ", str
);
143 if (conf
.loglevel_arg
<= INFO
)
144 fprintf(outfd
, "%i: ", ll
);
146 if (conf
.loglevel_arg
<= INFO
)
147 fprintf(outfd
, "(%d) ", mypid
);
149 vfprintf(outfd
, fmt
, argp
);
154 * setup shared memory area and get mutex for locking
156 static void shm_init(void)
159 int ret
= shm_new(sizeof(struct misc_meta_data
));
164 ret
= shm_attach(ret
, ATTACH_RW
, &shm
);
175 mmd
->selector_num
= 0;
177 mmd
->num_commands
= 0;
179 mmd
->num_connects
= 0;
180 mmd
->active_connections
= 0;
181 strcpy(mmd
->filename
, "(none)");
182 mmd
->audio_format
= -1;
183 mmd
->vss_status_flags
= VSS_NEXT
;
184 mmd
->new_vss_status_flags
= VSS_NEXT
;
185 mmd
->sender_cmd_data
.cmd_num
= -1;
188 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret
));
193 * lock the shared memory area containing the mmd struct
195 * \sa semop(2), struct misc_meta_data
199 mutex_lock(mmd_mutex
);
203 * unlock the shared memory area containing the mmd struct
205 * \sa semop(2), struct misc_meta_data
208 void mmd_unlock(void)
210 mutex_unlock(mmd_mutex
);
213 static void parse_config(int override
)
215 char *home
= para_homedir();
220 if (conf
.config_file_given
)
221 cf
= conf
.config_file_arg
;
223 cf
= make_message("%s/.paraslash/server.conf", home
);
224 free(user_list_file
);
225 if (!conf
.user_list_given
)
226 user_list_file
= make_message("%s/.paraslash/server.users", home
);
228 user_list_file
= para_strdup(conf
.user_list_arg
);
229 ret
= stat(cf
, &statbuf
);
230 if (ret
&& conf
.config_file_given
) {
232 PARA_EMERG_LOG("can not stat config file %s\n", cf
);
236 int tmp
= conf
.daemon_given
;
237 struct server_cmdline_parser_params params
= {
238 .override
= override
,
243 server_cmdline_parser_config_file(cf
, &conf
, ¶ms
);
244 conf
.daemon_given
= tmp
;
247 if (!conf
.logfile_given
&& conf
.daemon_given
) {
249 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
252 if (conf
.logfile_given
)
253 logfile
= open_log(conf
.logfile_arg
);
260 free(user_list_file
);
261 user_list_file
= NULL
;
265 static void setup_signal_handling(void)
269 signal_pipe
= para_signal_init();
270 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
271 ret
+= para_install_sighandler(SIGINT
);
272 ret
+= para_install_sighandler(SIGTERM
);
273 ret
+= para_install_sighandler(SIGHUP
);
274 ret
+= para_install_sighandler(SIGCHLD
);
275 ret
+= para_install_sighandler(SIGUSR1
);
276 signal(SIGPIPE
, SIG_IGN
);
278 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
283 static void init_selector(void)
287 mmd
->selector_change
= -1; /* no change nec., set to new num by com_chs */
288 if (!conf
.selector_given
)
290 for (i
= 0; selectors
[i
].name
; i
++) {
291 if (strcmp(selectors
[i
].name
, conf
.selector_arg
))
293 PARA_NOTICE_LOG("initializing %s audio file selector\n",
295 ret
= selectors
[i
].init(&selectors
[i
]);
297 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret
));
300 mmd
->selector_num
= i
;
303 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
305 mmd
->selector_num
= 0;
306 selectors
[0].init(&selectors
[0]); /* always successful */
309 static unsigned init_network(void)
311 int fd
, ret
= init_tcp_socket(conf
.port_arg
);
316 ret
= mark_fd_nonblock(fd
);
321 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret
));
325 static void init_random_seed(void)
329 size_t len
= sizeof(unsigned int);
331 fd
= open("/dev/urandom", O_RDONLY
);
335 if (read(fd
, &seed
, len
) != len
)
344 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
349 static uint32_t afs_socket_cookie
;
350 static int afs_socket
;
353 static void init_afs(void)
355 int ret
, afs_server_socket
[2];
357 ret
= socketpair(PF_UNIX
, SOCK_DGRAM
, 0, afs_server_socket
);
360 afs_socket_cookie
= para_random((uint32_t)-1);
364 if (!afs_pid
) /* child (afs) */
365 afs_init(afs_socket_cookie
, afs_server_socket
[1]);
366 close(afs_server_socket
[1]);
367 afs_socket
= afs_server_socket
[0];
368 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket
,
369 (unsigned) afs_socket_cookie
);
373 static unsigned do_inits(int argc
, char **argv
)
375 /* connector's address information */
379 /* parse command line options */
380 server_cmdline_parser(argc
, argv
, &conf
);
381 HANDLE_VERSION_FLAG("server", conf
);
382 para_drop_privileges(conf
.user_arg
, conf
.group_arg
);
383 /* parse config file, open log and set defaults */
385 log_welcome("para_server", conf
.loglevel_arg
);
386 shm_init(); /* init mmd struct */
387 server_uptime(UPTIME_SET
); /* reset server uptime */
388 init_user_list(user_list_file
);
390 if (conf
.daemon_given
)
393 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
394 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
396 mmd
->server_pid
= getpid();
397 setup_signal_handling();
400 /* init network socket */
401 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
402 sockfd
= init_network();
403 PARA_NOTICE_LOG("%s", "init complete\n");
407 static void change_selector(void)
409 int ret
, old
= mmd
->selector_num
, new = mmd
->selector_change
;
411 selectors
[old
].shutdown();
412 ret
= selectors
[new].init(&selectors
[new]);
413 mmd
->selector_change
= -1; /* reset */
415 mmd
->selector_num
= new;
419 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret
));
420 selectors
[0].init(&selectors
[0]);
421 mmd
->selector_num
= 0;
425 * called when server gets SIGHUP or when client invokes hup command.
427 static void handle_sighup(void)
429 PARA_NOTICE_LOG("%s", "SIGHUP\n");
430 close_log(logfile
); /* gets reopened if necessary by parse_config */
432 parse_config(1); /* reopens log */
433 mmd
->selector_change
= mmd
->selector_num
; /* do not change selector.. */
434 change_selector(); /* .. just reload */
435 init_user_list(user_list_file
); /* reload user list */
438 static void status_refresh(void)
440 static int prev_uptime
= -1, prev_events
= -1;
441 int uptime
= server_uptime(UPTIME_GET
), ret
= 1;
443 if (prev_events
!= mmd
->events
)
445 if (mmd
->new_vss_status_flags
!= mmd
->vss_status_flags
)
447 if (uptime
/ 60 != prev_uptime
/ 60)
451 prev_uptime
= uptime
;
452 prev_events
= mmd
->events
;
453 mmd
->vss_status_flags
= mmd
->new_vss_status_flags
;
455 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
456 mmd
->events
, mmd
->audio_format
);
462 * the main function of para_server
464 * \param argc usual argument count
465 * \param argv usual argument vector
467 * \return EXIT_SUCCESS or EXIT_FAILURE
470 int main(int argc
, char *argv
[])
472 /* listen on sock_fd, new connection on new_fd */
474 struct sockaddr_in their_addr
;
475 int i
, max_fileno
, ret
;
478 struct timeval
*timeout
;
481 sockfd
= do_inits(argc
, argv
);
486 /* check socket and signal pipe in any case */
487 para_fd_set(sockfd
, &rfds
, &max_fileno
);
488 para_fd_set(signal_pipe
, &rfds
, &max_fileno
);
489 timeout
= vss_preselect();
491 for (i
= 0; senders
[i
].name
; i
++) {
492 if (senders
[i
].status
!= SENDER_ON
)
494 if (!senders
[i
].pre_select
)
496 senders
[i
].pre_select( &max_fileno
, &rfds
, &wfds
);
498 if (selectors
[mmd
->selector_num
].pre_select
) {
499 ret
= selectors
[mmd
->selector_num
].pre_select(&rfds
, &wfds
);
500 max_fileno
= PARA_MAX(max_fileno
, ret
);
503 ret
= para_select(max_fileno
+ 1, &rfds
, &wfds
, timeout
);
505 if (mmd
->selector_change
>= 0)
507 if (selectors
[mmd
->selector_num
].post_select
)
508 selectors
[mmd
->selector_num
].post_select(&rfds
, &wfds
);
511 for (i
= 0; senders
[i
].name
; i
++) {
512 if (senders
[i
].status
!= SENDER_ON
)
514 if (!senders
[i
].post_select
)
516 senders
[i
].post_select(&rfds
, &wfds
);
520 if (FD_ISSET(signal_pipe
, &rfds
)) {
523 sig
= para_next_signal();
530 pid
= para_reap_child();
535 PARA_EMERG_LOG("fatal: afs died\n");
539 /* die on sigint/sigterm. Kill all children too. */
542 PARA_EMERG_LOG("terminating on signal %d\n", sig
);
545 selectors
[mmd
->selector_num
].shutdown();
546 mutex_destroy(mmd_mutex
);
548 shm_destroy(mmd_shm_id
);
553 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
554 int num
= mmd
->sender_cmd_data
.cmd_num
,
555 s
= mmd
->sender_cmd_data
.sender_num
;
557 if (senders
[s
].client_cmds
[num
])
558 senders
[s
].client_cmds
[num
](&mmd
->sender_cmd_data
);
559 mmd
->sender_cmd_data
.cmd_num
= -1;
561 if (!FD_ISSET(sockfd
, &rfds
))
564 new_fd
= para_accept(sockfd
, &their_addr
, sizeof(struct sockaddr_in
));
567 PARA_INFO_LOG("got connection from %s, forking\n",
568 inet_ntoa(their_addr
.sin_addr
));
570 mmd
->active_connections
++;
574 PARA_CRIT_LOG("%s", "fork failed\n");
579 /* parent keeps accepting connections */
582 alarm(ALARM_TIMEOUT
);
584 close(sockfd
); /* child doesn't need the listener */
586 * put info on who we are serving into argv[0] to make
587 * client ip visible in top/ps
589 for (i
= argc
- 1; i
>= 0; i
--)
590 memset(argv
[i
], 0, strlen(argv
[i
]));
591 sprintf(argv
[0], "para_server (serving %s)",
592 inet_ntoa(their_addr
.sin_addr
));
593 return handle_connect(new_fd
, &their_addr
);