audiod: Make stat_task static.
[paraslash.git] / audiod_command.c
1 /*
2 * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod_command.c commands for para_audiod */
8
9 #include <sys/types.h>
10 #include <dirent.h>
11
12 #include "para.h"
13 #include "audiod.cmdline.h"
14 #include "list.h"
15 #include "close_on_fork.h"
16 #include "sched.h"
17 #include "filter.h"
18 #include "grab_client.cmdline.h"
19 #include "grab_client.h"
20
21 #include "error.h"
22 #include "audiod.h"
23 #include "net.h"
24 #include "daemon.h"
25 #include "string.h"
26 #include "fd.h"
27 #include "audiod_command_list.h"
28
29 extern char *stat_item_values[NUM_STAT_ITEMS];
30
31
32 /** iterate over the array of all audiod commands */
33 #define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++)
34
35 static int client_write(int fd, const char *buf)
36 {
37 size_t len = strlen(buf);
38 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
39 }
40
41 __malloc static char *audiod_status_string(void)
42 {
43 const char *status = (audiod_status == AUDIOD_ON)?
44 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
45 return make_message("%s: %s\n", status_item_list[SI_AUDIOD_STATUS], status);
46 }
47
48 static struct timeval *wstime(void)
49 {
50 int i;
51 struct timeval *max = NULL;
52 FOR_EACH_SLOT(i) {
53 struct slot_info *s = &slot[i];
54 if (!s->wng)
55 continue;
56 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
57 continue;
58 max = &s->wstime;
59 }
60 return max;
61 }
62 __malloc static char *decoder_flags(void)
63 {
64 int i;
65 char flags[MAX_STREAM_SLOTS + 1];
66
67 FOR_EACH_SLOT(i) {
68 struct slot_info *s = &slot[i];
69 char flag = '0';
70 if (s->receiver_node)
71 flag += 1;
72 if (s->wng)
73 flag += 2;
74 flags[i] = flag;
75 }
76 flags[MAX_STREAM_SLOTS] = '\0';
77 return make_message("%s: %s\n", status_item_list[SI_DECODER_FLAGS],
78 flags);
79 }
80
81 static int dump_commands(int fd)
82 {
83 char *buf = para_strdup(""), *tmp = NULL;
84 int i;
85 ssize_t ret;
86
87 FOR_EACH_COMMAND(i) {
88 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
89 audiod_cmds[i].description);
90 free(buf);
91 buf = tmp;
92 }
93 ret = client_write(fd, buf);
94 free(buf);
95 return ret;
96 }
97
98 /*
99 * command handlers don't close their fd on errors (ret < 0) so that
100 * its caller can send an error message. Otherwise (ret >= 0) it's up
101 * to each individual command to close the fd if necessary.
102 */
103
104 int com_help(int fd, int argc, char **argv)
105 {
106 int i, ret;
107 char *buf;
108 const char *dflt = "No such command. Available commands:\n";
109
110 if (argc < 2) {
111 ret = dump_commands(fd);
112 goto out;
113 }
114 FOR_EACH_COMMAND(i) {
115 if (strcmp(audiod_cmds[i].name, argv[1]))
116 continue;
117 buf = make_message(
118 "NAME\n\t%s -- %s\n"
119 "SYNOPSIS\n\tpara_audioc %s\n"
120 "DESCRIPTION\n%s\n",
121 argv[1],
122 audiod_cmds[i].description,
123 audiod_cmds[i].usage,
124 audiod_cmds[i].help
125 );
126 ret = client_write(fd, buf);
127 free(buf);
128 goto out;
129 }
130 ret = client_write(fd, dflt);
131 if (ret > 0)
132 ret = dump_commands(fd);
133 out:
134 if (ret >= 0)
135 close(fd);
136 return ret;
137 }
138
139 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
140 {
141 char *tl = get_task_list();
142 int ret = 1;
143 if (tl)
144 ret = client_write(fd, tl);
145 free(tl);
146 if (ret > 0)
147 close(fd);
148 return ret;
149 }
150
151 int com_kill(int fd, int argc, char **argv)
152 {
153 int i, ret = 1;
154 if (argc < 2)
155 return -E_AUDIOD_SYNTAX;
156 for (i = 1; i < argc; i++) {
157 ret = kill_task(argv[i]);
158 if (ret < 0)
159 break;
160 }
161 if (ret > 0)
162 close(fd);
163 return ret;
164 }
165
166 int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
167 {
168 int i, ret;
169 char *buf = NULL;
170 long unsigned mask = ~0LU;
171
172 if (argc > 1) {
173 mask = 0;
174 for (i = 1; i < argc; i++) {
175 ret = stat_item_valid(argv[i]);
176 if (ret < 0)
177 return ret;
178 mask |= (1 << ret);
179 }
180 }
181 PARA_INFO_LOG("mask: 0x%lx\n", mask);
182 if (mask & (1 << SI_PLAY_TIME)) {
183 struct timeval *t = wstime();
184 char *ts = get_time_string(t);
185 if (ts) {
186 ret = client_write(fd, ts);
187 if (ret < 0)
188 goto out;
189 free(ts);
190 }
191 }
192 if (mask & (1 << SI_AUDIOD_UPTIME)) {
193 char *tmp, *us = uptime_str();
194 tmp = make_message("%s: %s\n",
195 status_item_list[SI_AUDIOD_UPTIME], us);
196 free(us);
197 ret = client_write(fd, tmp);
198 if (ret < 0)
199 goto out;
200 free(tmp);
201 }
202 if (mask & (1 << SI_AUDIOD_STATUS)) {
203 char *s = audiod_status_string();
204 ret = client_write(fd, s);
205 if (ret < 0)
206 goto out;
207 free(s);
208 }
209 if (mask & (1 << SI_DECODER_FLAGS)) {
210 char *df = decoder_flags();
211 ret = client_write(fd, df);
212 if (ret < 0)
213 goto out;
214 free(df);
215 }
216 FOR_EACH_STATUS_ITEM(i) {
217 char *tmp, *v;
218 if (!((1 << i) & mask))
219 continue;
220 v = stat_item_values[i];
221 tmp = make_message("%s%s%s", buf? buf: "",
222 v? v : "", v? "\n" : "");
223 free(buf);
224 buf = tmp;
225 }
226 ret = client_write(fd, buf);
227 out:
228 if (ret > 0)
229 ret = stat_client_add(fd, mask);
230 free(buf);
231 return ret;
232 }
233
234 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
235 {
236 int i;
237
238 FOR_EACH_SLOT(i) {
239 struct slot_info *s = &slot[i];
240 if (s->format < 0 || !s->fc)
241 continue;
242 if (slot_num >= 0 && slot_num != i)
243 continue;
244 if (format >= 0 && s->format != format)
245 continue;
246 if (num_filters(i) <= filternum)
247 continue;
248 /* success */
249 return s->fc->filter_nodes + filternum;
250 }
251 return NULL;
252 }
253
254 int com_grab(int fd, char *cmdline)
255 {
256 struct grab_client *gc;
257 struct filter_node *fn;
258 int i, err;
259 char *msg;
260
261 gc = grab_client_new(fd, cmdline, &err);
262 if (!gc)
263 goto err_out;
264 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
265 if (fn)
266 activate_grab_client(gc, fn);
267 return 1;
268 err_out:
269 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
270 return err;
271 if (err == -E_GC_HELP_GIVEN) {
272 msg = make_message("%s\n\n", grab_client_args_info_usage);
273 for (i = 0; grab_client_args_info_help[i]; i++) {
274 char *tmp = make_message("%s%s\n", msg,
275 grab_client_args_info_help[i]);
276 free(msg);
277 msg = tmp;
278 }
279 } else
280 msg = make_message("%s %s\n",
281 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
282 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
283 err = client_write(fd, msg);
284 free(msg);
285 if (err < 0)
286 return err;
287 close(fd);
288 return 1;
289 }
290
291 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
292 {
293 close(fd);
294 clean_exit(EXIT_SUCCESS, "terminating on user request");
295 }
296
297 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
298 {
299 audiod_status = AUDIOD_ON;
300 close(fd);
301 return 1;
302 }
303
304 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
305 {
306 audiod_status = AUDIOD_OFF;
307 close(fd);
308 return 1;
309 }
310
311 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
312 {
313 audiod_status = AUDIOD_STANDBY;
314 close(fd);
315 return 1;
316 }
317
318 int com_cycle(int fd, int argc, char **argv)
319 {
320 switch (audiod_status) {
321 case AUDIOD_ON:
322 return com_sb(fd, argc, argv);
323 break;
324 case AUDIOD_OFF:
325 return com_on(fd, argc, argv);
326 break;
327 case AUDIOD_STANDBY:
328 return com_off(fd, argc, argv);
329 break;
330 }
331 close(fd);
332 return 1;
333 }
334
335 static int check_perms(uid_t uid)
336 {
337 int i;
338
339 if (!conf.user_allow_given)
340 return 1;
341 for (i = 0; i < conf.user_allow_given; i++)
342 if (uid == conf.user_allow_arg[i])
343 return 1;
344 return -E_UCRED_PERM;
345 }
346
347 /**
348 * handle arriving connections on the local socket
349 *
350 * \param accept_fd the fd to call accept() on
351 *
352 * This is called whenever para_audiod's main task detects an incoming
353 * connection by the readability of \a accept_fd. This function reads the
354 * command sent by the peer, checks the connecting user's permissions by using
355 * unix socket credentials (if supported by the OS) and calls the corresponding
356 * command handler if permissions are OK.
357 *
358 * \return positive on success, negative on errors
359 *
360 * \sa para_accept(), recv_cred_buffer()
361 * */
362 int handle_connect(int accept_fd)
363 {
364 int i, argc, ret, clifd = -1;
365 char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
366 struct sockaddr_un unix_addr;
367 uid_t uid;
368
369 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
370 if (ret < 0)
371 goto out;
372 clifd = ret;
373 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
374 if (ret < 0)
375 goto out;
376 uid = ret;
377 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
378 ret = check_perms(uid);
379 if (ret < 0)
380 goto out;
381 ret = -E_INVALID_AUDIOD_CMD;
382 cmd = para_strdup(buf);
383 p = strchr(cmd, '\n');
384 if (!p)
385 p = "";
386 else {
387 *p = '\0';
388 p++;
389 }
390 for (i = 0; audiod_cmds[i].name; i++) {
391 int j;
392 if (strcmp(audiod_cmds[i].name, cmd))
393 continue;
394 if (audiod_cmds[i].handler) {
395 argc = split_args(buf, &argv, "\n");
396 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
397 ret = audiod_cmds[i].handler(clifd, argc, argv);
398 goto out;
399 }
400 for (j = 0; p[j]; j++)
401 if (p[j] == '\n')
402 p[j] = ' ';
403 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
404 ret = audiod_cmds[i].line_handler(clifd, p);
405 goto out;
406 }
407 ret = -E_INVALID_AUDIOD_CMD;
408 out:
409 free(cmd);
410 free(buf);
411 free(argv);
412 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
413 char *tmp = make_message("%s\n", para_strerror(-ret));
414 client_write(clifd, tmp);
415 free(tmp);
416 close(clifd);
417 }
418 return ret;
419 }
420 /**
421 * send the current audiod status to all connected stat clients
422 */
423 void audiod_status_dump(void)
424 {
425 struct timeval *t = wstime();
426 char *old, *new, *tmp;
427
428 old = stat_item_values[SI_PLAY_TIME];
429 new = get_time_string(t);
430 if (new) {
431 if (!old || strcmp(old, new)) {
432 free(old);
433 stat_client_write(new, SI_PLAY_TIME);
434 stat_item_values[SI_PLAY_TIME] = new;
435 } else
436 free(new);
437 }
438
439 new = uptime_str();
440 old = stat_item_values[SI_AUDIOD_UPTIME];
441 if (!old || strcmp(old, new)) {
442 free(old);
443 tmp = make_message("%s: %s\n",
444 status_item_list[SI_AUDIOD_UPTIME], new);
445 stat_client_write(tmp, SI_AUDIOD_UPTIME);
446 free(tmp);
447 stat_item_values[SI_AUDIOD_UPTIME] = new;
448 } else
449 free(new);
450
451 old = stat_item_values[SI_AUDIOD_STATUS];
452 new = audiod_status_string();
453 if (!old || strcmp(old, new)) {
454 free(old);
455 stat_client_write(new, SI_AUDIOD_STATUS);
456 stat_item_values[SI_AUDIOD_STATUS] = new;
457 } else
458 free(new);
459
460 old = stat_item_values[SI_DECODER_FLAGS];
461 new = decoder_flags();
462 if (!old || strcmp(old, new)) {
463 free(old);
464 stat_client_write(new, SI_DECODER_FLAGS);
465 stat_item_values[SI_DECODER_FLAGS] = new;
466 } else
467 free(new);
468 }
469
470 /**
471 * send empty status list
472 *
473 * Send to each connected client the full status item list
474 * with empty values.
475 */
476 void dump_empty_status(void)
477 {
478 int i;
479
480 FOR_EACH_STATUS_ITEM(i) {
481 char *tmp = make_message("%s:\n", status_item_list[i]);
482 stat_client_write(tmp, i);
483 free(tmp);
484 free(stat_item_values[i]);
485 stat_item_values[i] = NULL;
486 }
487 }