2 * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.c Paraslash's audio file selector. */
11 #include "server.cmdline.h"
18 #include <dirent.h> /* readdir() */
28 /** The osl tables used by afs. \sa blob.c. */
30 /** Contains audio file information. See aft.c. */
32 /** The table for the paraslash attributes. See attribute.c. */
35 * Paraslash's scoring system is based on Gaussian normal
36 * distributions, and the relevant data is stored in the rbtrees of an
37 * osl table containing only volatile columns. See score.c for
42 * A standard blob table containing the mood definitions. For details
46 /** A blob table containing lyrics on a per-song basis. */
48 /** Another blob table for images (for example album cover art). */
50 /** Yet another blob table for storing standard playlists. */
52 /** How many tables are in use? */
56 static struct afs_table afs_tables
[NUM_AFS_TABLES
] = {
57 [TBLNUM_AUDIO_FILES
] = {.init
= aft_init
},
58 [TBLNUM_ATTRIBUTES
] = {.init
= attribute_init
},
59 [TBLNUM_SCORES
] = {.init
= score_init
},
60 [TBLNUM_MOODS
] = {.init
= moods_init
},
61 [TBLNUM_LYRICS
] = {.init
= lyrics_init
},
62 [TBLNUM_IMAGES
] = {.init
= images_init
},
63 [TBLNUM_PLAYLIST
] = {.init
= playlists_init
},
67 /** The file descriptor for the local socket. */
70 * Value sent by the command handlers to identify themselves as
71 * children of the running para_server.
74 /** The associated task structure. */
78 extern struct misc_meta_data
*mmd
;
80 static int server_socket
;
81 static struct command_task command_task_struct
;
82 static struct signal_task signal_task_struct
;
84 static enum play_mode current_play_mode
;
85 static char *current_mop
; /* mode or playlist specifier. NULL means dummy mooe */
89 * A random number used to "authenticate" the connection.
91 * para_server picks this number by random before forking the afs process. The
92 * command handlers write this number together with the id of the shared memory
93 * area containing the query. This way, a malicious local user has to know this
94 * number to be able to cause the afs process to crash by sending fake queries.
96 extern uint32_t afs_socket_cookie
;
99 * Struct to let command handlers execute a callback in afs context.
101 * Commands that need to change the state of afs can't change the relevant data
102 * structures directly because commands are executed in a child process, i.e.
103 * they get their own virtual address space.
105 * This structure is used by \p send_callback_request() (executed from handler
106 * context) in order to let the afs process call the specified function. An
107 * instance of that structure is written to a shared memory area together with
108 * the arguments to the callback function. The identifier of the shared memory
109 * area is written to the command socket.
111 * The afs process accepts connections on the command socket and reads the
112 * shared memory id, attaches the corresponing area, calls the given handler to
113 * perform the desired action and to optionally compute a result.
115 * The result and a \p callback_result structure is then written to another
116 * shared memory area. The identifier for that area is written to the handler's
117 * command socket, so that the handler process can read the id, attach the
118 * shared memory area and use the result.
120 * \sa struct callback_result.
122 struct callback_query
{
123 /** The function to be called. */
124 callback_function
*handler
;
125 /** The number of bytes of the query */
130 * Structure embedded in the result of a callback.
132 * If the callback produced a result, an instance of that structure is embeeded
133 * into the shared memory area holding the result, mainly to let the command
134 * handler know the size of the result.
136 * \sa struct callback_query.
138 struct callback_result
{
139 /** The number of bytes of the result. */
144 * Ask the afs process to call a given function.
146 * \param f The function to be called.
147 * \param query Pointer to arbitrary data for the callback.
148 * \param result Callback result will be stored here.
150 * This function creates a shared memory area, copies the buffer pointed to by
151 * \a query to that area and notifies the afs process that \a f should be
154 * \return Negative, on errors, the return value of the callback function
157 * \sa send_option_arg_callback_request(), send_standard_callback_request().
159 int send_callback_request(callback_function
*f
, struct osl_object
*query
,
160 callback_result_handler
*result_handler
,
161 void *private_result_data
)
163 struct callback_query
*cq
;
164 int num_results
= 0, ret
, fd
= -1, query_shmid
, result_shmid
;
165 void *query_shm
, *result_shm
;
166 char buf
[sizeof(afs_socket_cookie
) + sizeof(int)];
167 size_t query_shm_size
= sizeof(*cq
);
170 query_shm_size
+= query
->size
;
171 ret
= shm_new(query_shm_size
);
175 ret
= shm_attach(query_shmid
, ATTACH_RW
, &query_shm
);
180 cq
->query_size
= query_shm_size
- sizeof(*cq
);
183 memcpy(query_shm
+ sizeof(*cq
), query
->data
, query
->size
);
184 ret
= shm_detach(query_shm
);
188 *(uint32_t *) buf
= afs_socket_cookie
;
189 *(int *) (buf
+ sizeof(afs_socket_cookie
)) = query_shmid
;
191 ret
= create_remote_socket(conf
.afs_socket_arg
);
195 ret
= send_bin_buffer(fd
, buf
, sizeof(buf
));
199 ret
= recv_bin_buffer(fd
, buf
, sizeof(int));
202 if (ret
!= sizeof(int)) {
203 ret
= -E_AFS_SHORT_READ
;
210 ret
= shm_attach(result_shmid
, ATTACH_RO
, &result_shm
);
212 struct callback_result
*cr
= result_shm
;
213 struct osl_object result
;
215 result
.size
= cr
->result_size
;
216 result
.data
= result_shm
+ sizeof(*cr
);
218 assert(result_handler
);
219 ret
= result_handler(&result
, private_result_data
);
220 if (shm_detach(result_shm
) < 0)
221 PARA_ERROR_LOG("can not detach result\n");
224 PARA_ERROR_LOG("attach result failed: %d\n", ret
);
225 if (shm_destroy(result_shmid
) < 0)
226 PARA_ERROR_LOG("destroy result failed\n");
231 if (shm_destroy(query_shmid
) < 0)
232 PARA_ERROR_LOG("%s\n", "shm destroy error");
237 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
242 * Send a callback request passing an options structure and an argument vector.
244 * \param options pointer to an arbitrary data structure.
245 * \param argc Argument count.
246 * \param argv Standard argument vector.
247 * \param f The callback function.
248 * \param result The result of the query is stored here.
250 * Some commands have a couple of options that are parsed in child context for
251 * syntactic correctness and are stored in a special options structure for that
252 * command. This function allows to pass such a structure together with a list
253 * of further arguments (often a list of audio files) to the parent process.
255 * \sa send_standard_callback_request(), send_callback_request().
257 int send_option_arg_callback_request(struct osl_object
*options
,
258 int argc
, char * const * const argv
, callback_function
*f
,
259 callback_result_handler
*result_handler
,
260 void *private_result_data
)
264 struct osl_object query
= {.size
= options
? options
->size
: 0};
266 for (i
= 0; i
< argc
; i
++)
267 query
.size
+= strlen(argv
[i
]) + 1;
268 query
.data
= para_malloc(query
.size
);
271 memcpy(query
.data
, options
->data
, options
->size
);
274 for (i
= 0; i
< argc
; i
++) {
275 strcpy(p
, argv
[i
]); /* OK */
276 p
+= strlen(argv
[i
]) + 1;
278 ret
= send_callback_request(f
, &query
, result_handler
,
279 private_result_data
);
285 * Send a callback request with an argument vector only.
287 * \param argc The same meaning as in send_option_arg_callback_request().
288 * \param argv The same meaning as in send_option_arg_callback_request().
289 * \param f The same meaning as in send_option_arg_callback_request().
290 * \param result The same meaning as in send_option_arg_callback_request().
292 * This is similar to send_option_arg_callback_request(), but no options buffer
293 * is passed to the parent process.
295 * \return The return value of the underlying call to
296 * send_option_arg_callback_request().
298 int send_standard_callback_request(int argc
, char * const * const argv
,
299 callback_function
*f
, callback_result_handler
*result_handler
,
300 void *private_result_data
)
302 return send_option_arg_callback_request(NULL
, argc
, argv
, f
, result_handler
,
303 private_result_data
);
306 static int action_if_pattern_matches(struct osl_row
*row
, void *data
)
308 struct pattern_match_data
*pmd
= data
;
309 struct osl_object name_obj
;
310 const char *p
, *name
;
311 int ret
= osl_get_object(pmd
->table
, row
, pmd
->match_col_num
, &name_obj
);
312 const char *pattern_txt
= (const char *)pmd
->patterns
.data
;
316 name
= (char *)name_obj
.data
;
317 if ((!name
|| !*name
) && (pmd
->pm_flags
& PM_SKIP_EMPTY_NAME
))
319 if (!pmd
->patterns
.size
&& (pmd
->pm_flags
& PM_NO_PATTERN_MATCHES_EVERYTHING
))
320 return pmd
->action(pmd
->table
, row
, name
, pmd
->data
);
321 for (p
= pattern_txt
; p
< pattern_txt
+ pmd
->patterns
.size
;
322 p
+= strlen(p
) + 1) {
323 ret
= fnmatch(p
, name
, pmd
->fnmatch_flags
);
324 if (ret
== FNM_NOMATCH
)
328 return pmd
->action(pmd
->table
, row
, name
, pmd
->data
);
334 * Execute the given function for each matching row.
336 * \param pmd Describes what to match and how.
338 * \return The return value of the underlying call to osl_rbtree_loop()
339 * or osl_rbtree_loop_reverse().
341 int for_each_matching_row(struct pattern_match_data
*pmd
)
343 if (pmd
->pm_flags
& PM_REVERSE_LOOP
)
344 return osl_rbtree_loop_reverse(pmd
->table
, pmd
->loop_col_num
, pmd
,
345 action_if_pattern_matches
);
346 return osl_rbtree_loop(pmd
->table
, pmd
->loop_col_num
, pmd
,
347 action_if_pattern_matches
);
351 * Compare two osl objects of string type.
353 * \param obj1 Pointer to the first object.
354 * \param obj2 Pointer to the second object.
356 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
357 * are taken into account.
359 * \return It returns an integer less than, equal to, or greater than zero if
360 * \a obj1 is found, respectively, to be less than, to match, or be greater than
363 * \sa strcmp(3), strncmp(3), osl_compare_func.
365 int string_compare(const struct osl_object
*obj1
, const struct osl_object
*obj2
)
367 const char *str1
= (const char *)obj1
->data
;
368 const char *str2
= (const char *)obj2
->data
;
369 return strncmp(str1
, str2
, PARA_MIN(obj1
->size
, obj2
->size
));
373 * write input from fd to dynamically allocated buffer,
374 * but maximal max_size byte.
376 static int fd2buf(int fd
, unsigned max_size
, struct osl_object
*obj
)
378 const size_t chunk_size
= 1024;
379 size_t size
= 2048, received
= 0;
381 char *buf
= para_malloc(size
);
384 ret
= recv_bin_buffer(fd
, buf
+ received
, chunk_size
);
388 if (received
+ chunk_size
>= size
) {
390 ret
= -E_INPUT_TOO_LARGE
;
393 buf
= para_realloc(buf
, size
);
397 obj
->size
= received
;
404 * Read data from a file descriptor, and send it to the afs process.
406 * \param fd File descriptor to read data from.
407 * \param arg_obj Pointer to the arguments to \a f.
408 * \param f The callback function.
409 * \param max_len Don't read more than that many bytes from stdin.
410 * \param result The result of the query is stored here.
412 * This function is used by commands that wish to let para_server store
413 * arbitrary data specified by the user (for instance the add_blob family of
414 * commands). First, at most \a max_len bytes are read from \a fd, the result
415 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
416 * is made available to the parent process via shared memory.
418 * \return Negative on errors, the return value of the underlying call to
419 * send_callback_request() otherwise.
421 int stdin_command(int fd
, struct osl_object
*arg_obj
, callback_function
*f
,
422 unsigned max_len
, callback_result_handler
*result_handler
,
423 void *private_result_data
)
425 struct osl_object query
, stdin_obj
;
428 ret
= send_buffer(fd
, AWAITING_DATA_MSG
);
431 ret
= fd2buf(fd
, max_len
, &stdin_obj
);
434 query
.size
= arg_obj
->size
+ stdin_obj
.size
;
435 query
.data
= para_malloc(query
.size
);
436 memcpy(query
.data
, arg_obj
->data
, arg_obj
->size
);
437 memcpy((char *)query
.data
+ arg_obj
->size
, stdin_obj
.data
, stdin_obj
.size
);
438 free(stdin_obj
.data
);
439 ret
= send_callback_request(f
, &query
, result_handler
, private_result_data
);
444 static int pass_afd(int fd
, char *buf
, size_t size
)
446 struct msghdr msg
= {.msg_iov
= NULL
};
447 struct cmsghdr
*cmsg
;
458 msg
.msg_control
= control
;
459 msg
.msg_controllen
= sizeof(control
);
461 cmsg
= CMSG_FIRSTHDR(&msg
);
462 cmsg
->cmsg_level
= SOL_SOCKET
;
463 cmsg
->cmsg_type
= SCM_RIGHTS
;
464 cmsg
->cmsg_len
= CMSG_LEN(sizeof(int));
465 *(int *)CMSG_DATA(cmsg
) = fd
;
467 /* Sum of the length of all control messages in the buffer */
468 msg
.msg_controllen
= cmsg
->cmsg_len
;
469 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size
, fd
);
470 ret
= sendmsg(server_socket
, &msg
, 0);
472 ret
= -ERRNO_TO_PARA_ERROR(errno
);
479 * Open the audio file with highest score.
481 * This stores all information for streaming the "best" audio file in a shared
482 * memory area. The id of that area and an open file descriptor for the next
483 * audio file are passed to the server process.
487 * \sa open_and_update_audio_file().
489 int open_next_audio_file(void)
491 struct osl_row
*aft_row
;
492 struct audio_file_data afd
;
497 PARA_NOTICE_LOG("getting next audio file\n");
498 ret
= score_get_best(&aft_row
, &score
);
500 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
501 goto no_admissible_files
;
503 ret
= open_and_update_audio_file(aft_row
, score
, &afd
);
505 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
506 ret
= score_delete(aft_row
);
508 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
509 goto no_admissible_files
;
514 if (!write_ok(server_socket
)) {
518 *(uint32_t *)buf
= NEXT_AUDIO_FILE
;
519 *(uint32_t *)(buf
+ 4) = (uint32_t)shmid
;
520 ret
= pass_afd(afd
.fd
, buf
, 8);
528 *(uint32_t *)buf
= NO_ADMISSIBLE_FILES
;
529 *(uint32_t *)(buf
+ 4) = (uint32_t)0;
530 return send_bin_buffer(server_socket
, buf
, 8);
533 /* Never fails if arg == NULL */
534 static int activate_mood_or_playlist(char *arg
, int *num_admissible
)
540 ret
= change_current_mood(NULL
); /* always successful */
541 mode
= PLAY_MODE_MOOD
;
543 if (!strncmp(arg
, "p/", 2)) {
544 ret
= playlist_open(arg
+ 2);
545 mode
= PLAY_MODE_PLAYLIST
;
546 } else if (!strncmp(arg
, "m/", 2)) {
547 ret
= change_current_mood(arg
+ 2);
548 mode
= PLAY_MODE_MOOD
;
550 return -E_AFS_SYNTAX
;
555 *num_admissible
= ret
;
556 current_play_mode
= mode
;
557 if (arg
!= current_mop
) {
560 current_mop
= para_strdup(arg
);
562 strncpy(mmd
->afs_mode_string
, arg
,
563 sizeof(mmd
->afs_mode_string
));
564 mmd
->afs_mode_string
[sizeof(mmd
->afs_mode_string
) - 1] = '\0';
568 strcpy(mmd
->afs_mode_string
, "dummy");
576 static void com_select_callback(int fd
, const struct osl_object
*query
)
578 struct para_buffer pb
= {
581 .max_size_handler
= pass_buffer_as_shm
583 char *arg
= query
->data
;
584 int num_admissible
, ret
, ret2
;
586 ret
= clear_score_table();
588 ret2
= para_printf(&pb
, "%s\n", para_strerror(-ret
));
591 if (current_play_mode
== PLAY_MODE_MOOD
)
592 close_current_mood();
595 ret
= activate_mood_or_playlist(arg
, &num_admissible
);
597 ret2
= para_printf(&pb
, "%s\nswitching back to %s\n",
598 para_strerror(-ret
), current_mop
?
599 current_mop
: "dummy");
600 ret
= activate_mood_or_playlist(current_mop
, &num_admissible
);
603 ret2
= para_printf(&pb
, "failed, switching to dummy\n");
604 activate_mood_or_playlist(NULL
, &num_admissible
);
607 ret2
= para_printf(&pb
, "activated %s (%d admissible files)\n", current_mop
?
608 current_mop
: "dummy mood", num_admissible
);
610 if (ret2
>= 0 && pb
.offset
)
611 pass_buffer_as_shm(pb
.buf
, pb
.offset
, &fd
);
615 int send_result(struct osl_object
*result
, void *private_result_data
)
617 int fd
= *(int *)private_result_data
;
620 return send_bin_buffer(fd
, result
->data
, result
->size
);
623 int com_select(int fd
, int argc
, char * const * const argv
)
625 struct osl_object query
;
628 return -E_AFS_SYNTAX
;
629 query
.data
= argv
[1];
630 query
.size
= strlen(argv
[1]) + 1;
631 return send_callback_request(com_select_callback
, &query
,
635 static void init_admissible_files(char *arg
)
637 if (activate_mood_or_playlist(arg
, NULL
) < 0)
638 activate_mood_or_playlist(NULL
, NULL
); /* always successful */
641 static int setup_command_socket_or_die(void)
644 char *socket_name
= conf
.afs_socket_arg
;
645 struct sockaddr_un unix_addr
;
648 ret
= create_local_socket(socket_name
, &unix_addr
,
649 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IWOTH
);
651 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret
), socket_name
);
655 if (listen(socket_fd
, 5) < 0) {
656 PARA_EMERG_LOG("can not listen on socket\n");
659 ret
= mark_fd_nonblocking(socket_fd
);
664 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name
,
669 static void close_afs_tables(void)
672 PARA_NOTICE_LOG("closing afs_tables\n");
673 for (i
= 0; i
< NUM_AFS_TABLES
; i
++)
674 afs_tables
[i
].close();
677 static char *database_dir
;
679 static void get_database_dir(void)
682 if (conf
.afs_database_dir_given
)
683 database_dir
= para_strdup(conf
.afs_database_dir_arg
);
685 char *home
= para_homedir();
686 database_dir
= make_message(
687 "%s/.paraslash/afs_database", home
);
691 PARA_INFO_LOG("afs_database dir %s\n", database_dir
);
694 static int make_database_dir(void)
699 ret
= para_mkdir(database_dir
, 0777);
700 if (ret
>= 0 || is_errno(-ret
, EEXIST
))
705 static int open_afs_tables(void)
710 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES
,
712 for (i
= 0; i
< NUM_AFS_TABLES
; i
++) {
713 ret
= afs_tables
[i
].open(database_dir
);
716 PARA_ERROR_LOG("%s init: %s\n", afs_tables
[i
].name
,
717 para_strerror(-ret
));
723 afs_tables
[--i
].close();
727 static void unregister_tasks(void)
729 unregister_task(&command_task_struct
.task
);
730 unregister_task(&signal_task_struct
.task
);
733 static void signal_pre_select(struct sched
*s
, struct task
*t
)
735 struct signal_task
*st
= t
->private_data
;
737 para_fd_set(st
->fd
, &s
->rfds
, &s
->max_fileno
);
740 static void signal_post_select(struct sched
*s
, struct task
*t
)
742 struct signal_task
*st
= t
->private_data
;
743 t
->ret
= -E_AFS_PARENT_DIED
;
747 if (!FD_ISSET(st
->fd
, &s
->rfds
))
749 st
->signum
= para_next_signal();
751 if (st
->signum
== SIGUSR1
)
752 return; /* ignore SIGUSR1 */
753 if (st
->signum
== SIGHUP
) {
755 t
->ret
= open_afs_tables();
758 init_admissible_files(current_mop
);
761 t
->ret
= -E_AFS_SIGNAL
;
763 PARA_NOTICE_LOG("%s\n", para_strerror(-t
->ret
));
767 static void register_signal_task(void)
769 struct signal_task
*st
= &signal_task_struct
;
770 st
->fd
= para_signal_init();
771 PARA_INFO_LOG("signal pipe: fd %d\n", st
->fd
);
772 para_install_sighandler(SIGINT
);
773 para_install_sighandler(SIGTERM
);
774 para_install_sighandler(SIGPIPE
);
775 para_install_sighandler(SIGHUP
);
777 st
->task
.pre_select
= signal_pre_select
;
778 st
->task
.post_select
= signal_post_select
;
779 st
->task
.private_data
= st
;
780 sprintf(st
->task
.status
, "signal task");
781 register_task(&st
->task
);
784 static struct list_head afs_client_list
;
786 /** Describes on connected afs client. */
788 /** Position in the afs client list. */
789 struct list_head node
;
790 /** The socket file descriptor for this client. */
792 /** The time the client connected. */
793 struct timeval connect_time
;
796 static void command_pre_select(struct sched
*s
, struct task
*t
)
798 struct command_task
*ct
= t
->private_data
;
799 struct afs_client
*client
;
801 para_fd_set(server_socket
, &s
->rfds
, &s
->max_fileno
);
802 para_fd_set(ct
->fd
, &s
->rfds
, &s
->max_fileno
);
803 list_for_each_entry(client
, &afs_client_list
, node
)
804 para_fd_set(client
->fd
, &s
->rfds
, &s
->max_fileno
);
808 int pass_buffer_as_shm(char *buf
, size_t size
, void *private_data
)
810 int ret
, shmid
, fd
= *(int *)private_data
;
812 struct callback_result
*cr
;
816 ret
= shm_new(size
+ sizeof(struct callback_result
));
820 ret
= shm_attach(shmid
, ATTACH_RW
, &shm
);
824 cr
->result_size
= size
;
825 memcpy(shm
+ sizeof(*cr
), buf
, size
);
826 ret
= shm_detach(shm
);
829 ret
= send_bin_buffer(fd
, (char *)&shmid
, sizeof(int));
833 if (shm_destroy(shmid
) < 0)
834 PARA_ERROR_LOG("destroy result failed\n");
839 * On errors, negative value is written to fd.
840 * On success: If query produced a result, the result_shmid is written to fd.
841 * Otherwise, zero is written.
843 static int call_callback(int fd
, int query_shmid
)
846 struct callback_query
*cq
;
847 struct osl_object query
;
850 ret
= shm_attach(query_shmid
, ATTACH_RW
, &query_shm
);
854 query
.data
= (char *)query_shm
+ sizeof(*cq
);
855 query
.size
= cq
->query_size
;
856 cq
->handler(fd
, &query
);
860 static void execute_server_command(void)
863 int ret
= recv_bin_buffer(server_socket
, buf
, sizeof(buf
) - 1);
867 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
871 PARA_DEBUG_LOG("received: %s\n", buf
);
872 if (!strcmp(buf
, "new")) {
873 ret
= open_next_audio_file();
875 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
880 PARA_ERROR_LOG("unknown command\n");
884 static void execute_afs_command(int fd
, uint32_t expected_cookie
)
888 char buf
[sizeof(cookie
) + sizeof(query_shmid
)];
889 int ret
= recv_bin_buffer(fd
, buf
, sizeof(buf
));
893 if (ret
!= sizeof(buf
)) {
894 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
895 ret
, (long unsigned) sizeof(buf
));
898 cookie
= *(uint32_t *)buf
;
899 if (cookie
!= expected_cookie
) {
900 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
901 (unsigned)cookie
, (unsigned)expected_cookie
);
904 query_shmid
= *(int *)(buf
+ sizeof(cookie
));
905 if (query_shmid
< 0) {
906 PARA_WARNING_LOG("received invalid query shmid %d)\n",
910 ret
= call_callback(fd
, query_shmid
);
914 PARA_NOTICE_LOG("%s\n", para_strerror(-ret
));
917 /** Shutdown connection if query has not arrived until this many seconds. */
918 #define AFS_CLIENT_TIMEOUT 3
920 static void command_post_select(struct sched
*s
, struct task
*t
)
922 struct command_task
*ct
= t
->private_data
;
923 struct sockaddr_un unix_addr
;
924 struct afs_client
*client
, *tmp
;
926 if (FD_ISSET(server_socket
, &s
->rfds
))
927 execute_server_command();
929 /* Check the list of connected clients. */
930 list_for_each_entry_safe(client
, tmp
, &afs_client_list
, node
) {
931 if (FD_ISSET(client
->fd
, &s
->rfds
))
932 execute_afs_command(client
->fd
, ct
->cookie
);
933 else { /* prevent bogus connection flooding */
935 tv_diff(now
, &client
->connect_time
, &diff
);
936 if (diff
.tv_sec
< AFS_CLIENT_TIMEOUT
)
938 PARA_WARNING_LOG("connection timeout\n");
941 list_del(&client
->node
);
944 /* Accept connections on the local socket. */
945 if (!FD_ISSET(ct
->fd
, &s
->rfds
))
947 t
->ret
= para_accept(ct
->fd
, &unix_addr
, sizeof(unix_addr
));
949 PARA_NOTICE_LOG("%s\n", para_strerror(-t
->ret
));
953 t
->ret
= mark_fd_nonblocking(fd
);
955 PARA_NOTICE_LOG("%s\n", para_strerror(-t
->ret
));
959 client
= para_malloc(sizeof(*client
));
961 client
->connect_time
= *now
;
962 para_list_add(&client
->node
, &afs_client_list
);
967 static void register_command_task(uint32_t cookie
)
969 struct command_task
*ct
= &command_task_struct
;
970 ct
->fd
= setup_command_socket_or_die();
973 ct
->task
.pre_select
= command_pre_select
;
974 ct
->task
.post_select
= command_post_select
;
975 ct
->task
.private_data
= ct
;
976 sprintf(ct
->task
.status
, "command task");
977 register_task(&ct
->task
);
980 static void register_tasks(uint32_t cookie
)
982 register_signal_task();
983 register_command_task(cookie
);
987 * Initialize the audio file selector process.
989 * \param cookie The value used for "authentication".
990 * \param socket_fd File descriptor used for communication with the server.
992 __noreturn
void afs_init(uint32_t cookie
, int socket_fd
)
997 INIT_LIST_HEAD(&afs_client_list
);
998 for (i
= 0; i
< NUM_AFS_TABLES
; i
++)
999 afs_tables
[i
].init(&afs_tables
[i
]);
1000 ret
= open_afs_tables();
1003 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
1006 server_socket
= socket_fd
;
1007 ret
= mark_fd_nonblocking(server_socket
);
1010 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1011 server_socket
, (unsigned) cookie
);
1012 init_admissible_files(conf
.afs_initial_mode_arg
);
1013 register_tasks(cookie
);
1014 s
.default_timeout
.tv_sec
= 0;
1015 s
.default_timeout
.tv_usec
= 999 * 1000;
1018 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));
1023 static void create_tables_callback(int fd
, const struct osl_object
*query
)
1025 uint32_t table_mask
= *(uint32_t *)query
->data
;
1030 for (i
= 0; i
< NUM_AFS_TABLES
; i
++) {
1031 struct afs_table
*t
= &afs_tables
[i
];
1033 if (!(table_mask
& (1 << i
)))
1037 ret
= t
->create(database_dir
);
1041 ret
= open_afs_tables();
1044 buf
= make_message("successfully created afs table(s)\n");
1046 buf
= make_message("%s\n", para_strerror(-ret
));
1047 pass_buffer_as_shm(buf
, strlen(buf
), &fd
);
1051 int com_init(int fd
, int argc
, char * const * const argv
)
1054 uint32_t table_mask
= (1 << (NUM_AFS_TABLES
+ 1)) - 1;
1055 struct osl_object query
= {.data
= &table_mask
,
1056 .size
= sizeof(table_mask
)};
1058 ret
= make_database_dir();
1063 for (i
= 1; i
< argc
; i
++) {
1064 for (j
= 0; j
< NUM_AFS_TABLES
; j
++) {
1065 struct afs_table
*t
= &afs_tables
[j
];
1067 if (strcmp(argv
[i
], t
->name
))
1069 table_mask
|= (1 << j
);
1072 if (j
== NUM_AFS_TABLES
)
1073 return -E_BAD_TABLE_NAME
;
1076 ret
= send_callback_request(create_tables_callback
, &query
, NULL
, NULL
);
1078 return send_va_buffer(fd
, "%s\n", para_strerror(-ret
));
1083 * Flags for the check command.
1087 enum com_check_flags
{
1088 /** Check the audio file table. */
1090 /** Check the mood table. */
1092 /** Check the playlist table. */
1096 int com_check(int fd
, int argc
, char * const * const argv
)
1101 for (i
= 1; i
< argc
; i
++) {
1102 const char *arg
= argv
[i
];
1105 if (!strcmp(arg
, "--")) {
1109 if (!strcmp(arg
, "-a")) {
1113 if (!strcmp(arg
, "-p")) {
1114 flags
|= CHECK_PLAYLISTS
;
1117 if (!strcmp(arg
, "-m")) {
1118 flags
|= CHECK_MOODS
;
1121 return -E_AFS_SYNTAX
;
1124 return -E_AFS_SYNTAX
;
1127 if (flags
& CHECK_AFT
) {
1128 ret
= send_callback_request(aft_check_callback
, NULL
, send_result
, &fd
);
1132 if (flags
& CHECK_PLAYLISTS
) {
1133 ret
= send_callback_request(playlist_check_callback
, NULL
, send_result
, &fd
);
1137 if (flags
& CHECK_MOODS
) {
1138 ret
= send_callback_request(mood_check_callback
, NULL
, send_result
, &fd
);
1145 void afs_event(enum afs_events event
, struct para_buffer
*pb
,
1150 for (i
= 0; i
< NUM_AFS_TABLES
; i
++) {
1151 struct afs_table
*t
= &afs_tables
[i
];
1152 if (!t
->event_handler
)
1154 ret
= t
->event_handler(event
, pb
, data
);
1156 PARA_CRIT_LOG("%s\n", para_strerror(-ret
));
1160 int images_event_handler(__a_unused
enum afs_events event
,
1161 __a_unused
struct para_buffer
*pb
, __a_unused
void *data
)
1166 int lyrics_event_handler(__a_unused
enum afs_events event
,
1167 __a_unused
struct para_buffer
*pb
, __a_unused
void *data
)