710f4b6dbc3f598c194759bfb179dea140732fac
[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, int argc, char **argv)
170 {
171 int i, ret;
172 char *buf = NULL;
173 uint64_t mask = 0;
174 const uint64_t one = 1;
175
176 if (argc > 1) {
177 for (i = 1; i < argc; i++) {
178 ret = stat_item_valid(argv[i]);
179 if (ret < 0)
180 return ret;
181 mask |= (one << ret);
182 }
183 } else
184 mask--; /* set all bits */
185 PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
186 FOR_EACH_STATUS_ITEM(i) {
187 char *tmp, *v;
188 if (!((one << i) & mask))
189 continue;
190 v = stat_item_values[i];
191 if (!v)
192 continue;
193 tmp = make_message("%s%s%s", buf? buf: "", v,
194 strrchr(v, '\n')? "" : "\n");
195 free(buf);
196 buf = tmp;
197 }
198 ret = client_write(fd, buf);
199 out:
200 if (ret > 0)
201 ret = stat_client_add(fd, mask);
202 free(buf);
203 return ret;
204 }
205
206 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
207 {
208 int i;
209
210 FOR_EACH_SLOT(i) {
211 struct slot_info *s = &slot[i];
212 if (s->format < 0 || !s->fc)
213 continue;
214 if (slot_num >= 0 && slot_num != i)
215 continue;
216 if (format >= 0 && s->format != format)
217 continue;
218 if (num_filters(i) <= filternum)
219 continue;
220 /* success */
221 return s->fc->filter_nodes + filternum;
222 }
223 return NULL;
224 }
225
226 int com_grab(int fd, char *cmdline)
227 {
228 struct grab_client *gc;
229 struct filter_node *fn;
230 int i, err;
231 char *msg;
232
233 gc = grab_client_new(fd, cmdline, &err);
234 if (!gc)
235 goto err_out;
236 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
237 if (fn)
238 activate_grab_client(gc, fn);
239 return 1;
240 err_out:
241 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
242 return err;
243 if (err == -E_GC_HELP_GIVEN) {
244 msg = make_message("%s\n\n", grab_client_args_info_usage);
245 for (i = 0; grab_client_args_info_help[i]; i++) {
246 char *tmp = make_message("%s%s\n", msg,
247 grab_client_args_info_help[i]);
248 free(msg);
249 msg = tmp;
250 }
251 } else
252 msg = make_message("%s %s\n",
253 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
254 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
255 err = client_write(fd, msg);
256 free(msg);
257 if (err < 0)
258 return err;
259 close(fd);
260 return 1;
261 }
262
263 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
264 {
265 close(fd);
266 clean_exit(EXIT_SUCCESS, "terminating on user request");
267 }
268
269 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
270 {
271 audiod_status = AUDIOD_ON;
272 close(fd);
273 return 1;
274 }
275
276 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
277 {
278 audiod_status = AUDIOD_OFF;
279 close(fd);
280 return 1;
281 }
282
283 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
284 {
285 audiod_status = AUDIOD_STANDBY;
286 close(fd);
287 return 1;
288 }
289
290 int com_cycle(int fd, int argc, char **argv)
291 {
292 switch (audiod_status) {
293 case AUDIOD_ON:
294 return com_sb(fd, argc, argv);
295 break;
296 case AUDIOD_OFF:
297 return com_on(fd, argc, argv);
298 break;
299 case AUDIOD_STANDBY:
300 return com_off(fd, argc, argv);
301 break;
302 }
303 close(fd);
304 return 1;
305 }
306
307 static int check_perms(uid_t uid)
308 {
309 int i;
310
311 if (!conf.user_allow_given)
312 return 1;
313 for (i = 0; i < conf.user_allow_given; i++)
314 if (uid == conf.user_allow_arg[i])
315 return 1;
316 return -E_UCRED_PERM;
317 }
318
319 /**
320 * handle arriving connections on the local socket
321 *
322 * \param accept_fd the fd to call accept() on
323 *
324 * This is called whenever para_audiod's main task detects an incoming
325 * connection by the readability of \a accept_fd. This function reads the
326 * command sent by the peer, checks the connecting user's permissions by using
327 * unix socket credentials (if supported by the OS) and calls the corresponding
328 * command handler if permissions are OK.
329 *
330 * \return positive on success, negative on errors
331 *
332 * \sa para_accept(), recv_cred_buffer()
333 * */
334 int handle_connect(int accept_fd)
335 {
336 int i, argc, ret, clifd = -1;
337 char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
338 struct sockaddr_un unix_addr;
339 uid_t uid;
340
341 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
342 if (ret < 0)
343 goto out;
344 clifd = ret;
345 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
346 if (ret < 0)
347 goto out;
348 uid = ret;
349 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
350 ret = check_perms(uid);
351 if (ret < 0)
352 goto out;
353 cmd = para_strdup(buf);
354 p = strchr(cmd, '\n');
355 if (!p)
356 p = "";
357 else {
358 *p = '\0';
359 p++;
360 }
361 for (i = 0; audiod_cmds[i].name; i++) {
362 int j;
363 if (strcmp(audiod_cmds[i].name, cmd))
364 continue;
365 if (audiod_cmds[i].handler) {
366 argc = split_args(buf, &argv, "\n");
367 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
368 ret = audiod_cmds[i].handler(clifd, argc, argv);
369 goto out;
370 }
371 for (j = 0; p[j]; j++)
372 if (p[j] == '\n')
373 p[j] = ' ';
374 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
375 ret = audiod_cmds[i].line_handler(clifd, p);
376 goto out;
377 }
378 ret = -E_INVALID_AUDIOD_CMD;
379 out:
380 free(cmd);
381 free(buf);
382 free(argv);
383 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
384 char *tmp = make_message("%s\n", para_strerror(-ret));
385 client_write(clifd, tmp);
386 free(tmp);
387 close(clifd);
388 }
389 return ret;
390 }
391 /**
392 * send the current audiod status to all connected stat clients
393 */
394 void audiod_status_dump(void)
395 {
396 int slot_num = get_play_time_slot_num();
397 char *old, *new, *tmp;
398
399 old = stat_item_values[SI_PLAY_TIME];
400 new = get_time_string(slot_num);
401 if (new) {
402 if (!old || strcmp(old, new)) {
403 free(old);
404 stat_client_write(new, SI_PLAY_TIME);
405 stat_item_values[SI_PLAY_TIME] = new;
406 } else
407 free(new);
408 }
409
410 tmp = uptime_str();
411 new = make_message("%s: %s\n", status_item_list[SI_AUDIOD_UPTIME],
412 tmp);
413 free(tmp);
414 old = stat_item_values[SI_AUDIOD_UPTIME];
415 if (!old || strcmp(old, new)) {
416 free(old);
417 stat_client_write(new, SI_AUDIOD_UPTIME);
418 stat_item_values[SI_AUDIOD_UPTIME] = new;
419 } else
420 free(new);
421
422 old = stat_item_values[SI_AUDIOD_STATUS];
423 new = audiod_status_string();
424 if (!old || strcmp(old, new)) {
425 free(old);
426 stat_client_write(new, SI_AUDIOD_STATUS);
427 stat_item_values[SI_AUDIOD_STATUS] = new;
428 } else
429 free(new);
430
431 old = stat_item_values[SI_DECODER_FLAGS];
432 new = decoder_flags();
433 if (!old || strcmp(old, new)) {
434 free(old);
435 stat_client_write(new, SI_DECODER_FLAGS);
436 stat_item_values[SI_DECODER_FLAGS] = new;
437 } else
438 free(new);
439 }
440
441 /**
442 * send empty status list
443 *
444 * Send to each connected client the full status item list
445 * with empty values.
446 */
447 void dump_empty_status(void)
448 {
449 int i;
450
451 FOR_EACH_STATUS_ITEM(i) {
452 char *tmp = make_message("%s:\n", status_item_list[i]);
453 stat_client_write(tmp, i);
454 free(tmp);
455 free(stat_item_values[i]);
456 stat_item_values[i] = NULL;
457 }
458 }