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