e57283cebe32a7dab6955f9d519b2752bd09e967
[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;
39
40 if (!buf)
41 return 0;
42 len = strlen(buf);
43 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
44 }
45
46 __malloc static char *audiod_status_string(void)
47 {
48 const char *status = (audiod_status == AUDIOD_ON)?
49 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
50 return para_strdup(status);
51 }
52
53 static int get_play_time_slot_num(void)
54 {
55 int i, oldest = -1;
56
57 FOR_EACH_SLOT(i) {
58 struct slot_info *s = &slot[i];
59 if (!s->wng)
60 continue;
61 if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
62 NULL) > 0)
63 continue;
64 oldest = i;
65 }
66 return oldest;
67 }
68
69 __malloc static char *decoder_flags(void)
70 {
71 int i;
72 char flags[MAX_STREAM_SLOTS + 1];
73
74 FOR_EACH_SLOT(i) {
75 struct slot_info *s = &slot[i];
76 char flag = '0';
77 if (s->receiver_node)
78 flag += 1;
79 if (s->fc)
80 flag += 2;
81 if (s->wng)
82 flag += 4;
83 flags[i] = flag;
84 }
85 flags[MAX_STREAM_SLOTS] = '\0';
86 return para_strdup(flags);
87 }
88
89 static int dump_commands(int fd)
90 {
91 char *buf = para_strdup(""), *tmp = NULL;
92 int i;
93 ssize_t ret;
94
95 FOR_EACH_COMMAND(i) {
96 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
97 audiod_cmds[i].description);
98 free(buf);
99 buf = tmp;
100 }
101 ret = client_write(fd, buf);
102 free(buf);
103 return ret;
104 }
105
106 /*
107 * command handlers don't close their fd on errors (ret < 0) so that
108 * its caller can send an error message. Otherwise (ret >= 0) it's up
109 * to each individual command to close the fd if necessary.
110 */
111
112 int com_help(int fd, int argc, char **argv)
113 {
114 int i, ret;
115 char *buf;
116 const char *dflt = "No such command. Available commands:\n";
117
118 if (argc < 2) {
119 ret = dump_commands(fd);
120 goto out;
121 }
122 FOR_EACH_COMMAND(i) {
123 if (strcmp(audiod_cmds[i].name, argv[1]))
124 continue;
125 buf = make_message(
126 "NAME\n\t%s -- %s\n"
127 "SYNOPSIS\n\tpara_audioc %s\n"
128 "DESCRIPTION\n%s\n",
129 argv[1],
130 audiod_cmds[i].description,
131 audiod_cmds[i].usage,
132 audiod_cmds[i].help
133 );
134 ret = client_write(fd, buf);
135 free(buf);
136 goto out;
137 }
138 ret = client_write(fd, dflt);
139 if (ret > 0)
140 ret = dump_commands(fd);
141 out:
142 if (ret >= 0)
143 close(fd);
144 return ret;
145 }
146
147 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
148 {
149 char *tl = get_task_list();
150 int ret = 1;
151 if (tl)
152 ret = client_write(fd, tl);
153 free(tl);
154 if (ret > 0)
155 close(fd);
156 return ret;
157 }
158
159 int com_kill(int fd, int argc, char **argv)
160 {
161 int i, ret = 1;
162 if (argc < 2)
163 return -E_AUDIOD_SYNTAX;
164 for (i = 1; i < argc; i++) {
165 ret = kill_task(argv[i]);
166 if (ret < 0)
167 break;
168 }
169 if (ret > 0)
170 close(fd);
171 return ret;
172 }
173
174 int com_stat(int fd, int argc, char **argv)
175 {
176 int i, ret, parser_friendly = 0;
177 uint64_t mask = 0;
178 const uint64_t one = 1;
179 struct para_buffer b = {.flags = 0};
180
181 for (i = 1; i < argc; i++) {
182 const char *arg = argv[i];
183 if (arg[0] != '-')
184 break;
185 if (!strcmp(arg, "--")) {
186 i++;
187 break;
188 }
189 if (!strncmp(arg, "-p", 2)) {
190 parser_friendly = 1;
191 b.flags = PBF_SIZE_PREFIX;
192 continue;
193 }
194 }
195 if (i >= argc)
196 mask--; /* set all bits */
197 for (; i < argc; i++) {
198 ret = stat_item_valid(argv[i]);
199 if (ret < 0)
200 return ret;
201 mask |= (one << ret);
202 }
203 PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
204 FOR_EACH_STATUS_ITEM(i) {
205 char *item = stat_item_values[i];
206 if (!((one << i) & mask))
207 continue;
208 WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
209 }
210 ret = client_write(fd, b.buf);
211 if (ret >= 0)
212 ret = stat_client_add(fd, mask, parser_friendly);
213 free(b.buf);
214 return ret;
215 }
216
217 #if 0
218 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
219 {
220 int i;
221
222 FOR_EACH_SLOT(i) {
223 struct slot_info *s = &slot[i];
224 if (s->format < 0 || !s->fc)
225 continue;
226 if (slot_num >= 0 && slot_num != i)
227 continue;
228 if (format >= 0 && s->format != format)
229 continue;
230 if (num_filters(i) <= filternum)
231 continue;
232 /* success */
233 return s->fc->filter_nodes + filternum;
234 }
235 return NULL;
236 }
237 #endif
238
239 int com_grab(int fd, __a_unused int argc, __a_unused char **argv)
240 {
241 client_write(fd, "grab is currently b0rken\n");
242 close(fd);
243 return 1;
244 #if 0
245 struct grab_client *gc;
246 struct filter_node *fn;
247 int i, err;
248 char *msg;
249
250 gc = grab_client_new(fd, cmdline, &err);
251 if (!gc)
252 goto err_out;
253 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
254 if (fn)
255 activate_grab_client(gc, fn);
256 return 1;
257 err_out:
258 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
259 return err;
260 if (err == -E_GC_HELP_GIVEN) {
261 msg = make_message("%s\n\n", grab_client_args_info_usage);
262 for (i = 0; grab_client_args_info_help[i]; i++) {
263 char *tmp = make_message("%s%s\n", msg,
264 grab_client_args_info_help[i]);
265 free(msg);
266 msg = tmp;
267 }
268 } else
269 msg = make_message("%s %s\n",
270 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
271 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
272 err = client_write(fd, msg);
273 free(msg);
274 if (err < 0)
275 return err;
276 close(fd);
277 return 1;
278 #endif
279 }
280
281 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
282 {
283 close(fd);
284 clean_exit(EXIT_SUCCESS, "terminating on user request");
285 }
286
287 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
288 {
289 audiod_status = AUDIOD_ON;
290 close(fd);
291 return 1;
292 }
293
294 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
295 {
296 audiod_status = AUDIOD_OFF;
297 close(fd);
298 return 1;
299 }
300
301 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
302 {
303 audiod_status = AUDIOD_STANDBY;
304 close(fd);
305 return 1;
306 }
307
308 int com_cycle(int fd, int argc, char **argv)
309 {
310 switch (audiod_status) {
311 case AUDIOD_ON:
312 return com_sb(fd, argc, argv);
313 break;
314 case AUDIOD_OFF:
315 return com_on(fd, argc, argv);
316 break;
317 case AUDIOD_STANDBY:
318 return com_off(fd, argc, argv);
319 break;
320 }
321 close(fd);
322 return 1;
323 }
324
325 static int check_perms(uid_t uid)
326 {
327 int i;
328
329 if (!conf.user_allow_given)
330 return 1;
331 for (i = 0; i < conf.user_allow_given; i++)
332 if (uid == conf.user_allow_arg[i])
333 return 1;
334 return -E_UCRED_PERM;
335 }
336
337 /**
338 * handle arriving connections on the local socket
339 *
340 * \param accept_fd the fd to call accept() on
341 *
342 * This is called whenever para_audiod's main task detects an incoming
343 * connection by the readability of \a accept_fd. This function reads the
344 * command sent by the peer, checks the connecting user's permissions by using
345 * unix socket credentials (if supported by the OS) and calls the corresponding
346 * command handler if permissions are OK.
347 *
348 * \return positive on success, negative on errors
349 *
350 * \sa para_accept(), recv_cred_buffer()
351 * */
352 int handle_connect(int accept_fd)
353 {
354 int i, argc, ret, clifd = -1;
355 char buf[MAXLINE], **argv = NULL;
356 struct sockaddr_un unix_addr;
357 uid_t uid;
358
359 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
360 if (ret < 0)
361 goto out;
362 clifd = ret;
363 ret = recv_cred_buffer(clifd, buf, sizeof(buf) - 1);
364 if (ret < 0)
365 goto out;
366 uid = ret;
367 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
368 ret = check_perms(uid);
369 if (ret < 0)
370 goto out;
371 ret = create_argv(buf, "\n", &argv);
372 if (ret < 0)
373 goto out;
374 argc = ret;
375 //PARA_INFO_LOG("argv[0]: %s, argc = %d\n", argv[0], argc);
376 FOR_EACH_COMMAND(i) {
377 if (strcmp(audiod_cmds[i].name, argv[0]))
378 continue;
379 ret = audiod_cmds[i].handler(clifd, argc, argv);
380 goto out;
381 }
382 ret = -E_INVALID_AUDIOD_CMD;
383 out:
384 free_argv(argv);
385 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
386 char *tmp = make_message("%s\n", para_strerror(-ret));
387 client_write(clifd, tmp);
388 free(tmp);
389 close(clifd);
390 }
391 return ret;
392 }
393 /**
394 * Send the current audiod status to all connected stat clients.
395 */
396 void audiod_status_dump(void)
397 {
398 int slot_num = get_play_time_slot_num();
399 char *old, *new;
400
401 old = stat_item_values[SI_PLAY_TIME];
402 new = get_time_string(slot_num);
403 if (new) {
404 if (!old || strcmp(old, new)) {
405 free(old);
406 stat_item_values[SI_PLAY_TIME] = new;
407 stat_client_write_item(SI_PLAY_TIME);
408 } else
409 free(new);
410 }
411
412 new = uptime_str();
413 old = stat_item_values[SI_AUDIOD_UPTIME];
414 if (!old || strcmp(old, new)) {
415 free(old);
416 stat_item_values[SI_AUDIOD_UPTIME] = new;
417 stat_client_write_item(SI_AUDIOD_UPTIME);
418 } else
419 free(new);
420
421 old = stat_item_values[SI_AUDIOD_STATUS];
422 new = audiod_status_string();
423 if (!old || strcmp(old, new)) {
424 free(old);
425 stat_item_values[SI_AUDIOD_STATUS] = new;
426 stat_client_write_item(SI_AUDIOD_STATUS);
427 } else
428 free(new);
429
430 old = stat_item_values[SI_DECODER_FLAGS];
431 new = decoder_flags();
432 if (!old || strcmp(old, new)) {
433 free(old);
434 stat_item_values[SI_DECODER_FLAGS] = new;
435 stat_client_write_item(SI_DECODER_FLAGS);
436 } else
437 free(new);
438 }
439
440 /**
441 * Flush and send all status items.
442 *
443 * Send to each connected client the full status item list
444 * with empty values.
445 */
446 void clear_and_dump_items(void)
447 {
448 int i;
449
450 FOR_EACH_STATUS_ITEM(i) {
451 free(stat_item_values[i]);
452 stat_item_values[i] = NULL;
453 stat_client_write_item(i);
454 }
455 }