Fix osl() wrapper.
[paraslash.git] / audiod_command.c
1 /*
2 * Copyright (C) 2005-2009 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 "ggo.h"
18 #include "filter.h"
19 #include "grab_client.cmdline.h"
20 #include "grab_client.h"
21
22 #include "error.h"
23 #include "audiod.h"
24 #include "net.h"
25 #include "daemon.h"
26 #include "string.h"
27 #include "fd.h"
28 #include "audiod_command_list.h"
29
30 extern char *stat_item_values[NUM_STAT_ITEMS];
31
32
33 /** iterate over the array of all audiod commands */
34 #define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++)
35
36 static int client_write(int fd, const char *buf)
37 {
38 size_t len = strlen(buf);
39 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
40 }
41
42 __malloc static char *audiod_status_string(void)
43 {
44 const char *status = (audiod_status == AUDIOD_ON)?
45 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
46 return make_message("%s: %s\n", status_item_list[SI_AUDIOD_STATUS], status);
47 }
48
49 static int get_play_time_slot_num(void)
50 {
51 int i, oldest = -1;
52
53 FOR_EACH_SLOT(i) {
54 struct slot_info *s = &slot[i];
55 if (!s->wng)
56 continue;
57 if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
58 NULL) > 0)
59 continue;
60 oldest = i;
61 }
62 return oldest;
63 }
64
65 __malloc static char *decoder_flags(void)
66 {
67 int i;
68 char flags[MAX_STREAM_SLOTS + 1];
69
70 FOR_EACH_SLOT(i) {
71 struct slot_info *s = &slot[i];
72 char flag = '0';
73 if (s->receiver_node)
74 flag += 1;
75 if (s->wng)
76 flag += 2;
77 flags[i] = flag;
78 }
79 flags[MAX_STREAM_SLOTS] = '\0';
80 return make_message("%s: %s\n", status_item_list[SI_DECODER_FLAGS],
81 flags);
82 }
83
84 static int dump_commands(int fd)
85 {
86 char *buf = para_strdup(""), *tmp = NULL;
87 int i;
88 ssize_t ret;
89
90 FOR_EACH_COMMAND(i) {
91 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
92 audiod_cmds[i].description);
93 free(buf);
94 buf = tmp;
95 }
96 ret = client_write(fd, buf);
97 free(buf);
98 return ret;
99 }
100
101 /*
102 * command handlers don't close their fd on errors (ret < 0) so that
103 * its caller can send an error message. Otherwise (ret >= 0) it's up
104 * to each individual command to close the fd if necessary.
105 */
106
107 int com_help(int fd, int argc, char **argv)
108 {
109 int i, ret;
110 char *buf;
111 const char *dflt = "No such command. Available commands:\n";
112
113 if (argc < 2) {
114 ret = dump_commands(fd);
115 goto out;
116 }
117 FOR_EACH_COMMAND(i) {
118 if (strcmp(audiod_cmds[i].name, argv[1]))
119 continue;
120 buf = make_message(
121 "NAME\n\t%s -- %s\n"
122 "SYNOPSIS\n\tpara_audioc %s\n"
123 "DESCRIPTION\n%s\n",
124 argv[1],
125 audiod_cmds[i].description,
126 audiod_cmds[i].usage,
127 audiod_cmds[i].help
128 );
129 ret = client_write(fd, buf);
130 free(buf);
131 goto out;
132 }
133 ret = client_write(fd, dflt);
134 if (ret > 0)
135 ret = dump_commands(fd);
136 out:
137 if (ret >= 0)
138 close(fd);
139 return ret;
140 }
141
142 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
143 {
144 char *tl = get_task_list();
145 int ret = 1;
146 if (tl)
147 ret = client_write(fd, tl);
148 free(tl);
149 if (ret > 0)
150 close(fd);
151 return ret;
152 }
153
154 int com_kill(int fd, int argc, char **argv)
155 {
156 int i, ret = 1;
157 if (argc < 2)
158 return -E_AUDIOD_SYNTAX;
159 for (i = 1; i < argc; i++) {
160 ret = kill_task(argv[i]);
161 if (ret < 0)
162 break;
163 }
164 if (ret > 0)
165 close(fd);
166 return ret;
167 }
168
169 int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
170 {
171 int i, ret;
172 char *buf = NULL;
173 long unsigned mask = ~0LU;
174
175 if (argc > 1) {
176 mask = 0;
177 for (i = 1; i < argc; i++) {
178 ret = stat_item_valid(argv[i]);
179 if (ret < 0)
180 return ret;
181 mask |= (1 << ret);
182 }
183 }
184 PARA_INFO_LOG("mask: 0x%lx\n", mask);
185 if (mask & (1 << SI_PLAY_TIME)) {
186 int slot_num = get_play_time_slot_num();
187 char *ts = get_time_string(slot_num);
188 if (ts) {
189 ret = client_write(fd, ts);
190 if (ret < 0)
191 goto out;
192 free(ts);
193 }
194 }
195 if (mask & (1 << SI_AUDIOD_UPTIME)) {
196 char *tmp, *us = uptime_str();
197 tmp = make_message("%s: %s\n",
198 status_item_list[SI_AUDIOD_UPTIME], us);
199 free(us);
200 ret = client_write(fd, tmp);
201 if (ret < 0)
202 goto out;
203 free(tmp);
204 }
205 if (mask & (1 << SI_AUDIOD_STATUS)) {
206 char *s = audiod_status_string();
207 ret = client_write(fd, s);
208 if (ret < 0)
209 goto out;
210 free(s);
211 }
212 if (mask & (1 << SI_DECODER_FLAGS)) {
213 char *df = decoder_flags();
214 ret = client_write(fd, df);
215 if (ret < 0)
216 goto out;
217 free(df);
218 }
219 FOR_EACH_STATUS_ITEM(i) {
220 char *tmp, *v;
221 if (!((1 << i) & mask))
222 continue;
223 v = stat_item_values[i];
224 tmp = make_message("%s%s%s", buf? buf: "",
225 v? v : "", v? "\n" : "");
226 free(buf);
227 buf = tmp;
228 }
229 ret = client_write(fd, buf);
230 out:
231 if (ret > 0)
232 ret = stat_client_add(fd, mask);
233 free(buf);
234 return ret;
235 }
236
237 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
238 {
239 int i;
240
241 FOR_EACH_SLOT(i) {
242 struct slot_info *s = &slot[i];
243 if (s->format < 0 || !s->fc)
244 continue;
245 if (slot_num >= 0 && slot_num != i)
246 continue;
247 if (format >= 0 && s->format != format)
248 continue;
249 if (num_filters(i) <= filternum)
250 continue;
251 /* success */
252 return s->fc->filter_nodes + filternum;
253 }
254 return NULL;
255 }
256
257 int com_grab(int fd, char *cmdline)
258 {
259 struct grab_client *gc;
260 struct filter_node *fn;
261 int i, err;
262 char *msg;
263
264 gc = grab_client_new(fd, cmdline, &err);
265 if (!gc)
266 goto err_out;
267 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
268 if (fn)
269 activate_grab_client(gc, fn);
270 return 1;
271 err_out:
272 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
273 return err;
274 if (err == -E_GC_HELP_GIVEN) {
275 msg = make_message("%s\n\n", grab_client_args_info_usage);
276 for (i = 0; grab_client_args_info_help[i]; i++) {
277 char *tmp = make_message("%s%s\n", msg,
278 grab_client_args_info_help[i]);
279 free(msg);
280 msg = tmp;
281 }
282 } else
283 msg = make_message("%s %s\n",
284 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
285 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
286 err = client_write(fd, msg);
287 free(msg);
288 if (err < 0)
289 return err;
290 close(fd);
291 return 1;
292 }
293
294 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
295 {
296 close(fd);
297 clean_exit(EXIT_SUCCESS, "terminating on user request");
298 }
299
300 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
301 {
302 audiod_status = AUDIOD_ON;
303 close(fd);
304 return 1;
305 }
306
307 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
308 {
309 audiod_status = AUDIOD_OFF;
310 close(fd);
311 return 1;
312 }
313
314 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
315 {
316 audiod_status = AUDIOD_STANDBY;
317 close(fd);
318 return 1;
319 }
320
321 int com_cycle(int fd, int argc, char **argv)
322 {
323 switch (audiod_status) {
324 case AUDIOD_ON:
325 return com_sb(fd, argc, argv);
326 break;
327 case AUDIOD_OFF:
328 return com_on(fd, argc, argv);
329 break;
330 case AUDIOD_STANDBY:
331 return com_off(fd, argc, argv);
332 break;
333 }
334 close(fd);
335 return 1;
336 }
337
338 static int check_perms(uid_t uid)
339 {
340 int i;
341
342 if (!conf.user_allow_given)
343 return 1;
344 for (i = 0; i < conf.user_allow_given; i++)
345 if (uid == conf.user_allow_arg[i])
346 return 1;
347 return -E_UCRED_PERM;
348 }
349
350 /**
351 * handle arriving connections on the local socket
352 *
353 * \param accept_fd the fd to call accept() on
354 *
355 * This is called whenever para_audiod's main task detects an incoming
356 * connection by the readability of \a accept_fd. This function reads the
357 * command sent by the peer, checks the connecting user's permissions by using
358 * unix socket credentials (if supported by the OS) and calls the corresponding
359 * command handler if permissions are OK.
360 *
361 * \return positive on success, negative on errors
362 *
363 * \sa para_accept(), recv_cred_buffer()
364 * */
365 int handle_connect(int accept_fd)
366 {
367 int i, argc, ret, clifd = -1;
368 char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
369 struct sockaddr_un unix_addr;
370 uid_t uid;
371
372 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
373 if (ret < 0)
374 goto out;
375 clifd = ret;
376 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
377 if (ret < 0)
378 goto out;
379 uid = ret;
380 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
381 ret = check_perms(uid);
382 if (ret < 0)
383 goto out;
384 cmd = para_strdup(buf);
385 p = strchr(cmd, '\n');
386 if (!p)
387 p = "";
388 else {
389 *p = '\0';
390 p++;
391 }
392 for (i = 0; audiod_cmds[i].name; i++) {
393 int j;
394 if (strcmp(audiod_cmds[i].name, cmd))
395 continue;
396 if (audiod_cmds[i].handler) {
397 argc = split_args(buf, &argv, "\n");
398 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
399 ret = audiod_cmds[i].handler(clifd, argc, argv);
400 goto out;
401 }
402 for (j = 0; p[j]; j++)
403 if (p[j] == '\n')
404 p[j] = ' ';
405 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
406 ret = audiod_cmds[i].line_handler(clifd, p);
407 goto out;
408 }
409 ret = -E_INVALID_AUDIOD_CMD;
410 out:
411 free(cmd);
412 free(buf);
413 free(argv);
414 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
415 char *tmp = make_message("%s\n", para_strerror(-ret));
416 client_write(clifd, tmp);
417 free(tmp);
418 close(clifd);
419 }
420 return ret;
421 }
422 /**
423 * send the current audiod status to all connected stat clients
424 */
425 void audiod_status_dump(void)
426 {
427 int slot_num = get_play_time_slot_num();
428 char *old, *new, *tmp;
429
430 old = stat_item_values[SI_PLAY_TIME];
431 new = get_time_string(slot_num);
432 if (new) {
433 if (!old || strcmp(old, new)) {
434 free(old);
435 stat_client_write(new, SI_PLAY_TIME);
436 stat_item_values[SI_PLAY_TIME] = new;
437 } else
438 free(new);
439 }
440
441 new = uptime_str();
442 old = stat_item_values[SI_AUDIOD_UPTIME];
443 if (!old || strcmp(old, new)) {
444 free(old);
445 tmp = make_message("%s: %s\n",
446 status_item_list[SI_AUDIOD_UPTIME], new);
447 stat_client_write(tmp, SI_AUDIOD_UPTIME);
448 free(tmp);
449 stat_item_values[SI_AUDIOD_UPTIME] = new;
450 } else
451 free(new);
452
453 old = stat_item_values[SI_AUDIOD_STATUS];
454 new = audiod_status_string();
455 if (!old || strcmp(old, new)) {
456 free(old);
457 stat_client_write(new, SI_AUDIOD_STATUS);
458 stat_item_values[SI_AUDIOD_STATUS] = new;
459 } else
460 free(new);
461
462 old = stat_item_values[SI_DECODER_FLAGS];
463 new = decoder_flags();
464 if (!old || strcmp(old, new)) {
465 free(old);
466 stat_client_write(new, SI_DECODER_FLAGS);
467 stat_item_values[SI_DECODER_FLAGS] = new;
468 } else
469 free(new);
470 }
471
472 /**
473 * send empty status list
474 *
475 * Send to each connected client the full status item list
476 * with empty values.
477 */
478 void dump_empty_status(void)
479 {
480 int i;
481
482 FOR_EACH_STATUS_ITEM(i) {
483 char *tmp = make_message("%s:\n", status_item_list[i]);
484 stat_client_write(tmp, i);
485 free(tmp);
486 free(stat_item_values[i]);
487 stat_item_values[i] = NULL;
488 }
489 }