Add missing regex include to generated command_list files.
[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 <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12
13 #include "para.h"
14 #include "audiod.cmdline.h"
15 #include "list.h"
16 #include "close_on_fork.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "filter.h"
20 #include "grab_client.h"
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;
38
39 if (!buf)
40 return 0;
41 len = strlen(buf);
42 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
43 }
44
45 __malloc static char *audiod_status_string(void)
46 {
47 const char *status = (audiod_status == AUDIOD_ON)?
48 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
49 return para_strdup(status);
50 }
51
52 static int get_play_time_slot_num(void)
53 {
54 int i, oldest = -1;
55
56 FOR_EACH_SLOT(i) {
57 struct slot_info *s = &slot[i];
58 if (!s->wng)
59 continue;
60 if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
61 NULL) > 0)
62 continue;
63 oldest = i;
64 }
65 return oldest;
66 }
67
68 __malloc static char *decoder_flags(void)
69 {
70 int i;
71 char flags[MAX_STREAM_SLOTS + 1];
72
73 FOR_EACH_SLOT(i) {
74 struct slot_info *s = &slot[i];
75 char flag = '0';
76 if (s->receiver_node)
77 flag += 1;
78 if (s->fc)
79 flag += 2;
80 if (s->wng)
81 flag += 4;
82 flags[i] = flag;
83 }
84 flags[MAX_STREAM_SLOTS] = '\0';
85 return para_strdup(flags);
86 }
87
88 static int dump_commands(int fd)
89 {
90 char *buf = para_strdup(""), *tmp = NULL;
91 int i;
92 ssize_t ret;
93
94 FOR_EACH_COMMAND(i) {
95 tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
96 audiod_cmds[i].description);
97 free(buf);
98 buf = tmp;
99 }
100 ret = client_write(fd, buf);
101 free(buf);
102 return ret;
103 }
104
105 /*
106 * command handlers don't close their fd on errors (ret < 0) so that
107 * its caller can send an error message. Otherwise (ret >= 0) it's up
108 * to each individual command to close the fd if necessary.
109 */
110
111 int com_help(int fd, int argc, char **argv)
112 {
113 int i, ret;
114 char *buf;
115 const char *dflt = "No such command. Available commands:\n";
116
117 if (argc < 2) {
118 ret = dump_commands(fd);
119 goto out;
120 }
121 FOR_EACH_COMMAND(i) {
122 if (strcmp(audiod_cmds[i].name, argv[1]))
123 continue;
124 buf = make_message(
125 "NAME\n\t%s -- %s\n"
126 "SYNOPSIS\n\tpara_audioc %s\n"
127 "DESCRIPTION\n%s\n",
128 argv[1],
129 audiod_cmds[i].description,
130 audiod_cmds[i].usage,
131 audiod_cmds[i].help
132 );
133 ret = client_write(fd, buf);
134 free(buf);
135 goto out;
136 }
137 ret = client_write(fd, dflt);
138 if (ret > 0)
139 ret = dump_commands(fd);
140 out:
141 if (ret >= 0)
142 close(fd);
143 return ret;
144 }
145
146 int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
147 {
148 char *tl = get_task_list();
149 int ret = 1;
150 if (tl)
151 ret = client_write(fd, tl);
152 free(tl);
153 if (ret > 0)
154 close(fd);
155 return ret;
156 }
157
158 int com_kill(int fd, int argc, char **argv)
159 {
160 int i, ret = 1;
161 if (argc < 2)
162 return -E_AUDIOD_SYNTAX;
163 for (i = 1; i < argc; i++) {
164 ret = kill_task(argv[i]);
165 if (ret < 0)
166 break;
167 }
168 if (ret > 0)
169 close(fd);
170 return ret;
171 }
172
173 int com_stat(int fd, int argc, char **argv)
174 {
175 int i, ret, parser_friendly = 0;
176 uint64_t mask = 0;
177 const uint64_t one = 1;
178 struct para_buffer b = {.flags = 0};
179
180 for (i = 1; i < argc; i++) {
181 const char *arg = argv[i];
182 if (arg[0] != '-')
183 break;
184 if (!strcmp(arg, "--")) {
185 i++;
186 break;
187 }
188 if (!strncmp(arg, "-p", 2)) {
189 parser_friendly = 1;
190 b.flags = PBF_SIZE_PREFIX;
191 continue;
192 }
193 }
194 if (i >= argc)
195 mask--; /* set all bits */
196 for (; i < argc; i++) {
197 ret = stat_item_valid(argv[i]);
198 if (ret < 0)
199 return ret;
200 mask |= (one << ret);
201 }
202 PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
203 FOR_EACH_STATUS_ITEM(i) {
204 char *item = stat_item_values[i];
205 if (!((one << i) & mask))
206 continue;
207 WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
208 }
209 ret = client_write(fd, b.buf);
210 if (ret >= 0)
211 ret = stat_client_add(fd, mask, parser_friendly);
212 free(b.buf);
213 return ret;
214 }
215
216 int com_grab(int fd, int argc, char **argv)
217 {
218 return grab_client_new(fd, argc, argv);
219 }
220
221 __noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
222 {
223 close(fd);
224 clean_exit(EXIT_SUCCESS, "terminating on user request");
225 }
226
227 int com_on(int fd, __a_unused int argc, __a_unused char **argv)
228 {
229 audiod_status = AUDIOD_ON;
230 close(fd);
231 return 1;
232 }
233
234 int com_off(int fd, __a_unused int argc, __a_unused char **argv)
235 {
236 audiod_status = AUDIOD_OFF;
237 close(fd);
238 return 1;
239 }
240
241 int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
242 {
243 audiod_status = AUDIOD_STANDBY;
244 close(fd);
245 return 1;
246 }
247
248 int com_cycle(int fd, int argc, char **argv)
249 {
250 switch (audiod_status) {
251 case AUDIOD_ON:
252 return com_sb(fd, argc, argv);
253 break;
254 case AUDIOD_OFF:
255 return com_on(fd, argc, argv);
256 break;
257 case AUDIOD_STANDBY:
258 return com_off(fd, argc, argv);
259 break;
260 }
261 close(fd);
262 return 1;
263 }
264
265 static int check_perms(uid_t uid)
266 {
267 int i;
268
269 if (!conf.user_allow_given)
270 return 1;
271 for (i = 0; i < conf.user_allow_given; i++)
272 if (uid == conf.user_allow_arg[i])
273 return 1;
274 return -E_UCRED_PERM;
275 }
276
277 /**
278 * handle arriving connections on the local socket
279 *
280 * \param accept_fd the fd to call accept() on
281 *
282 * This is called whenever para_audiod's main task detects an incoming
283 * connection by the readability of \a accept_fd. This function reads the
284 * command sent by the peer, checks the connecting user's permissions by using
285 * unix socket credentials (if supported by the OS) and calls the corresponding
286 * command handler if permissions are OK.
287 *
288 * \return positive on success, negative on errors
289 *
290 * \sa para_accept(), recv_cred_buffer()
291 * */
292 int handle_connect(int accept_fd)
293 {
294 int i, argc, ret, clifd = -1;
295 char buf[MAXLINE], **argv = NULL;
296 struct sockaddr_un unix_addr;
297 uid_t uid;
298
299 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
300 if (ret < 0)
301 goto out;
302 clifd = ret;
303 ret = recv_cred_buffer(clifd, buf, sizeof(buf) - 1);
304 if (ret < 0)
305 goto out;
306 uid = ret;
307 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
308 ret = check_perms(uid);
309 if (ret < 0)
310 goto out;
311 ret = create_argv(buf, "\n", &argv);
312 if (ret < 0)
313 goto out;
314 argc = ret;
315 //PARA_INFO_LOG("argv[0]: %s, argc = %d\n", argv[0], argc);
316 FOR_EACH_COMMAND(i) {
317 if (strcmp(audiod_cmds[i].name, argv[0]))
318 continue;
319 ret = audiod_cmds[i].handler(clifd, argc, argv);
320 goto out;
321 }
322 ret = -E_INVALID_AUDIOD_CMD;
323 out:
324 free_argv(argv);
325 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
326 char *tmp = make_message("%s\n", para_strerror(-ret));
327 client_write(clifd, tmp);
328 free(tmp);
329 close(clifd);
330 }
331 return ret;
332 }
333
334 /**
335 * Send the current audiod status to all connected stat clients.
336 */
337 void audiod_status_dump(void)
338 {
339 int slot_num = get_play_time_slot_num();
340 char *old, *new;
341
342 old = stat_item_values[SI_PLAY_TIME];
343 new = get_time_string(slot_num);
344 if (new) {
345 if (!old || strcmp(old, new)) {
346 free(old);
347 stat_item_values[SI_PLAY_TIME] = new;
348 stat_client_write_item(SI_PLAY_TIME);
349 } else
350 free(new);
351 }
352
353 new = uptime_str();
354 old = stat_item_values[SI_AUDIOD_UPTIME];
355 if (!old || strcmp(old, new)) {
356 free(old);
357 stat_item_values[SI_AUDIOD_UPTIME] = new;
358 stat_client_write_item(SI_AUDIOD_UPTIME);
359 } else
360 free(new);
361
362 old = stat_item_values[SI_AUDIOD_STATUS];
363 new = audiod_status_string();
364 if (!old || strcmp(old, new)) {
365 free(old);
366 stat_item_values[SI_AUDIOD_STATUS] = new;
367 stat_client_write_item(SI_AUDIOD_STATUS);
368 } else
369 free(new);
370
371 old = stat_item_values[SI_DECODER_FLAGS];
372 new = decoder_flags();
373 if (!old || strcmp(old, new)) {
374 free(old);
375 stat_item_values[SI_DECODER_FLAGS] = new;
376 stat_client_write_item(SI_DECODER_FLAGS);
377 } else
378 free(new);
379 }
380
381 /**
382 * Flush and send all status items.
383 *
384 * Send to each connected client the full status item list
385 * with empty values.
386 */
387 void clear_and_dump_items(void)
388 {
389 int i;
390
391 FOR_EACH_STATUS_ITEM(i) {
392 free(stat_item_values[i]);
393 stat_item_values[i] = NULL;
394 stat_client_write_item(i);
395 }
396 }