460b9539 |
1 | /* |
2 | * This file is part of DisOrder. |
3 | * Copyright (C) 2004, 2005, 2006 Richard Kettlewell |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | * General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
18 | * USA |
19 | */ |
20 | |
21 | #include <config.h> |
22 | #include "types.h" |
23 | |
24 | #include <pwd.h> |
25 | #include <sys/types.h> |
26 | #include <sys/socket.h> |
27 | #include <sys/time.h> |
28 | #include <unistd.h> |
29 | #include <stdlib.h> |
30 | #include <string.h> |
31 | #include <errno.h> |
32 | #include <fcntl.h> |
33 | #include <gcrypt.h> |
34 | #include <stddef.h> |
35 | #include <time.h> |
36 | #include <limits.h> |
37 | #include <pcre.h> |
38 | #include <netdb.h> |
39 | #include <netinet/in.h> |
40 | |
41 | #include "event.h" |
42 | #include "server.h" |
43 | #include "syscalls.h" |
44 | #include "queue.h" |
45 | #include "play.h" |
46 | #include "log.h" |
47 | #include "mem.h" |
48 | #include "state.h" |
49 | #include "charset.h" |
50 | #include "split.h" |
51 | #include "configuration.h" |
52 | #include "hex.h" |
53 | #include "trackdb.h" |
54 | #include "table.h" |
55 | #include "kvp.h" |
56 | #include "mixer.h" |
57 | #include "sink.h" |
58 | #include "authhash.h" |
59 | #include "plugin.h" |
60 | #include "printf.h" |
61 | #include "trackname.h" |
62 | #include "eventlog.h" |
63 | #include "defs.h" |
64 | #include "cache.h" |
65 | |
66 | #ifndef NONCE_SIZE |
67 | # define NONCE_SIZE 16 |
68 | #endif |
69 | |
70 | int volume_left, volume_right; /* last known volume */ |
71 | |
72 | struct listener { |
73 | const char *name; |
74 | int pf; |
75 | }; |
76 | |
77 | struct conn { |
78 | ev_reader *r; |
79 | ev_writer *w; |
80 | int fd; |
81 | unsigned tag; |
82 | char *who; |
83 | ev_source *ev; |
84 | unsigned char nonce[NONCE_SIZE]; |
85 | ev_reader_callback *reader; |
86 | struct eventlog_output *lo; |
87 | const struct listener *l; |
88 | }; |
89 | |
90 | static int reader_callback(ev_source *ev, |
91 | ev_reader *reader, |
92 | int fd, |
93 | void *ptr, |
94 | size_t bytes, |
95 | int eof, |
96 | void *u); |
97 | |
98 | static const char *noyes[] = { "no", "yes" }; |
99 | |
100 | static int writer_error(ev_source attribute((unused)) *ev, |
101 | int fd, |
102 | int errno_value, |
103 | void *u) { |
104 | struct conn *c = u; |
105 | |
106 | D(("server writer_error %d %d", fd, errno_value)); |
107 | if(errno_value == 0) { |
108 | /* writer is done */ |
109 | c->w = 0; |
110 | if(c->r == 0) { |
111 | D(("server writer_error closes %d", fd)); |
112 | xclose(fd); /* reader is done too, close */ |
113 | } else { |
114 | D(("server writer_error shutdown %d SHUT_WR", fd)); |
115 | xshutdown(fd, SHUT_WR); /* reader is not done yet */ |
116 | } |
117 | } else { |
118 | if(errno_value != EPIPE) |
119 | error(errno_value, "S%x write error on socket", c->tag); |
120 | if(c->r) |
121 | ev_reader_cancel(c->r); |
122 | xclose(fd); |
123 | } |
124 | return 0; |
125 | } |
126 | |
127 | static int reader_error(ev_source attribute((unused)) *ev, |
128 | int fd, |
129 | int errno_value, |
130 | void *u) { |
131 | struct conn *c = u; |
132 | |
133 | D(("server reader_error %d %d", fd, errno_value)); |
134 | error(errno, "S%x read error on socket", c->tag); |
135 | ev_writer_cancel(c->w); |
136 | xclose(fd); |
137 | return 0; |
138 | } |
139 | |
140 | /* return true if we are talking to a trusted user */ |
141 | static int trusted(struct conn *c) { |
142 | int n; |
143 | |
144 | for(n = 0; (n < config->trust.n |
145 | && strcmp(config->trust.s[n], c->who)); ++n) |
146 | ; |
147 | return n < config->trust.n; |
148 | } |
149 | |
150 | static int c_disable(struct conn *c, char **vec, int nvec) { |
151 | if(nvec == 0) |
152 | disable_playing(c->who); |
153 | else if(nvec == 1 && !strcmp(vec[0], "now")) |
154 | disable_playing(c->who); |
155 | else { |
156 | sink_writes(ev_writer_sink(c->w), "550 invalid argument\n"); |
157 | return 1; /* completed */ |
158 | } |
159 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
160 | return 1; /* completed */ |
161 | } |
162 | |
163 | static int c_enable(struct conn *c, |
164 | char attribute((unused)) **vec, |
165 | int attribute((unused)) nvec) { |
166 | enable_playing(c->who, c->ev); |
167 | /* Enable implicitly unpauses if there is nothing playing */ |
168 | if(paused && !playing) resume_playing(c->who); |
169 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
170 | return 1; /* completed */ |
171 | } |
172 | |
173 | static int c_enabled(struct conn *c, |
174 | char attribute((unused)) **vec, |
175 | int attribute((unused)) nvec) { |
176 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]); |
177 | return 1; /* completed */ |
178 | } |
179 | |
180 | static int c_play(struct conn *c, char **vec, |
181 | int attribute((unused)) nvec) { |
182 | const char *track; |
183 | struct queue_entry *q; |
184 | |
185 | if(!trackdb_exists(vec[0])) { |
186 | sink_writes(ev_writer_sink(c->w), "550 track is not in database\n"); |
187 | return 1; |
188 | } |
189 | if(!(track = trackdb_resolve(vec[0]))) { |
190 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
191 | return 1; |
192 | } |
193 | q = queue_add(track, c->who, WHERE_BEFORE_RANDOM); |
194 | queue_write(); |
195 | /* If we added the first track, and something is playing, then prepare the |
196 | * new track. If nothing is playing then we don't bother as it wouldn't gain |
197 | * anything. */ |
198 | if(q == qhead.next && playing) |
199 | prepare(c->ev, q); |
200 | sink_writes(ev_writer_sink(c->w), "250 queued\n"); |
201 | /* If the queue was empty but we are for some reason paused then |
202 | * unpause. */ |
203 | if(!playing) resume_playing(0); |
204 | play(c->ev); |
205 | return 1; /* completed */ |
206 | } |
207 | |
208 | static int c_remove(struct conn *c, char **vec, |
209 | int attribute((unused)) nvec) { |
210 | struct queue_entry *q; |
211 | |
212 | if(!(q = queue_find(vec[0]))) { |
213 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
214 | return 1; |
215 | } |
216 | if(config->restrictions & RESTRICT_REMOVE) { |
217 | /* can only remove tracks that you submitted */ |
218 | if(!q->submitter || strcmp(q->submitter, c->who)) { |
219 | sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); |
220 | return 1; |
221 | } |
222 | } |
223 | queue_remove(q, c->who); |
224 | /* De-prepare the track. */ |
225 | abandon(c->ev, q); |
226 | /* If we removed the random track then add another one. */ |
227 | if(q->state == playing_random) |
228 | add_random_track(); |
229 | /* Prepare whatever the next head track is. */ |
230 | if(qhead.next != &qhead) |
231 | prepare(c->ev, qhead.next); |
232 | queue_write(); |
233 | sink_writes(ev_writer_sink(c->w), "250 removed\n"); |
234 | return 1; /* completed */ |
235 | } |
236 | |
237 | static int c_scratch(struct conn *c, |
238 | char **vec, |
239 | int nvec) { |
240 | if(!playing) { |
241 | sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n"); |
242 | return 1; /* completed */ |
243 | } |
244 | if(config->restrictions & RESTRICT_SCRATCH) { |
245 | /* can only scratch tracks you submitted and randomly selected ones */ |
246 | if(playing->submitter && strcmp(playing->submitter, c->who)) { |
247 | sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); |
248 | return 1; |
249 | } |
250 | } |
251 | scratch(c->who, nvec == 1 ? vec[0] : 0); |
252 | /* If you scratch an unpaused track then it is automatically unpaused */ |
253 | resume_playing(0); |
254 | sink_writes(ev_writer_sink(c->w), "250 scratched\n"); |
255 | return 1; /* completed */ |
256 | } |
257 | |
258 | static int c_pause(struct conn *c, |
259 | char attribute((unused)) **vec, |
260 | int attribute((unused)) nvec) { |
261 | if(!playing) { |
262 | sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n"); |
263 | return 1; /* completed */ |
264 | } |
265 | if(paused) { |
266 | sink_writes(ev_writer_sink(c->w), "250 already paused\n"); |
267 | return 1; /* completed */ |
268 | } |
269 | if(pause_playing(c->who) < 0) |
270 | sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n"); |
271 | else |
272 | sink_writes(ev_writer_sink(c->w), "250 paused\n"); |
273 | return 1; |
274 | } |
275 | |
276 | static int c_resume(struct conn *c, |
277 | char attribute((unused)) **vec, |
278 | int attribute((unused)) nvec) { |
279 | if(!paused) { |
280 | sink_writes(ev_writer_sink(c->w), "250 not paused\n"); |
281 | return 1; /* completed */ |
282 | } |
283 | resume_playing(c->who); |
284 | sink_writes(ev_writer_sink(c->w), "250 paused\n"); |
285 | return 1; |
286 | } |
287 | |
288 | static int c_shutdown(struct conn *c, |
289 | char attribute((unused)) **vec, |
290 | int attribute((unused)) nvec) { |
291 | info("S%x shut down by %s", c->tag, c->who); |
292 | sink_writes(ev_writer_sink(c->w), "250 shutting down\n"); |
293 | ev_writer_flush(c->w); |
294 | quit(c->ev); |
295 | } |
296 | |
297 | static int c_reconfigure(struct conn *c, |
298 | char attribute((unused)) **vec, |
299 | int attribute((unused)) nvec) { |
300 | info("S%x reconfigure by %s", c->tag, c->who); |
301 | if(reconfigure(c->ev, 1)) |
302 | sink_writes(ev_writer_sink(c->w), "550 error reading new config\n"); |
303 | else |
304 | sink_writes(ev_writer_sink(c->w), "250 installed new config\n"); |
305 | return 1; /* completed */ |
306 | } |
307 | |
308 | static int c_rescan(struct conn *c, |
309 | char attribute((unused)) **vec, |
310 | int attribute((unused)) nvec) { |
311 | info("S%x rescan by %s", c->tag, c->who); |
312 | trackdb_rescan(c->ev); |
313 | sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n"); |
314 | return 1; /* completed */ |
315 | } |
316 | |
317 | static int c_version(struct conn *c, |
318 | char attribute((unused)) **vec, |
319 | int attribute((unused)) nvec) { |
320 | /* VERSION had better only use the basic character set */ |
321 | sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_version_string); |
322 | return 1; /* completed */ |
323 | } |
324 | |
325 | static int c_playing(struct conn *c, |
326 | char attribute((unused)) **vec, |
327 | int attribute((unused)) nvec) { |
328 | if(playing) { |
329 | queue_fix_sofar(playing); |
330 | playing->expected = 0; |
331 | sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing)); |
332 | } else |
333 | sink_printf(ev_writer_sink(c->w), "259 nothing playing\n"); |
334 | return 1; /* completed */ |
335 | } |
336 | |
337 | static int c_become(struct conn *c, |
338 | char **vec, |
339 | int attribute((unused)) nvec) { |
340 | c->who = vec[0]; |
341 | sink_writes(ev_writer_sink(c->w), "230 OK\n"); |
342 | return 1; |
343 | } |
344 | |
345 | static int c_user(struct conn *c, |
346 | char **vec, |
347 | int attribute((unused)) nvec) { |
348 | int n; |
349 | const char *res; |
350 | union { |
351 | struct sockaddr sa; |
352 | struct sockaddr_in in; |
353 | struct sockaddr_in6 in6; |
354 | } u; |
355 | socklen_t l; |
356 | char host[1024]; |
357 | |
358 | if(c->who) { |
359 | sink_writes(ev_writer_sink(c->w), "530 already authenticated\n"); |
360 | return 1; |
361 | } |
362 | /* get connection data */ |
363 | l = sizeof u; |
364 | if(getpeername(c->fd, &u.sa, &l) < 0) { |
365 | error(errno, "S%x error calling getpeername", c->tag); |
366 | sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); |
367 | return 1; |
368 | } |
369 | if(c->l->pf != PF_UNIX) { |
370 | if((n = getnameinfo(&u.sa, l, |
371 | host, sizeof host, 0, 0, NI_NUMERICHOST))) { |
372 | error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n)); |
373 | sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); |
374 | return 1; |
375 | } |
376 | } |
377 | /* find the user */ |
378 | for(n = 0; n < config->allow.n |
379 | && strcmp(config->allow.s[n].s[0], vec[0]); ++n) |
380 | ; |
381 | /* if it's a real user check whether the response is right */ |
382 | if(n < config->allow.n) { |
383 | res = authhash(c->nonce, sizeof c->nonce, config->allow.s[n].s[1]); |
384 | if(res && !strcmp(res, vec[1])) { |
385 | c->who = vec[0]; |
386 | /* currently we only bother logging remote connections */ |
387 | if(c->l->pf != PF_UNIX) |
388 | info("S%x %s connected from %s", c->tag, vec[0], host); |
389 | sink_writes(ev_writer_sink(c->w), "230 OK\n"); |
390 | return 1; |
391 | } |
392 | } |
393 | /* oops, response was wrong */ |
394 | if(c->l->pf != PF_UNIX) |
395 | info("S%x authentication failure for %s from %s", c->tag, vec[0], host); |
396 | else |
397 | info("S%x authentication failure for %s", c->tag, vec[0]); |
398 | sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); |
399 | return 1; |
400 | } |
401 | |
402 | static int c_recent(struct conn *c, |
403 | char attribute((unused)) **vec, |
404 | int attribute((unused)) nvec) { |
405 | const struct queue_entry *q; |
406 | |
407 | sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n"); |
408 | for(q = phead.next; q != &phead; q = q->next) |
409 | sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q)); |
410 | sink_writes(ev_writer_sink(c->w), ".\n"); |
411 | return 1; /* completed */ |
412 | } |
413 | |
414 | static int c_queue(struct conn *c, |
415 | char attribute((unused)) **vec, |
416 | int attribute((unused)) nvec) { |
417 | struct queue_entry *q; |
418 | time_t when = 0; |
419 | const char *l; |
420 | long length; |
421 | |
422 | sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n"); |
423 | if(playing_is_enabled() && !paused) { |
424 | if(playing) { |
425 | queue_fix_sofar(playing); |
426 | if((l = trackdb_get(playing->track, "_length")) |
427 | && (length = atol(l))) { |
428 | time(&when); |
429 | when += length - playing->sofar + config->gap; |
430 | } |
431 | } else |
432 | /* Nothing is playing but playing is enabled, so whatever is |
433 | * first in the queue can be expected to start immediately. */ |
434 | time(&when); |
435 | } |
436 | for(q = qhead.next; q != &qhead; q = q->next) { |
437 | /* fill in estimated start time */ |
438 | q->expected = when; |
439 | sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q)); |
440 | /* update for next track */ |
441 | if(when) { |
442 | if((l = trackdb_get(q->track, "_length")) |
443 | && (length = atol(l))) |
444 | when += length + config->gap; |
445 | else |
446 | when = 0; |
447 | } |
448 | } |
449 | sink_writes(ev_writer_sink(c->w), ".\n"); |
450 | return 1; /* completed */ |
451 | } |
452 | |
453 | static int output_list(struct conn *c, char **vec) { |
454 | while(*vec) |
455 | sink_printf(ev_writer_sink(c->w), "%s\n", *vec++); |
456 | sink_writes(ev_writer_sink(c->w), ".\n"); |
457 | return 1; |
458 | } |
459 | |
460 | static int files_dirs(struct conn *c, |
461 | char **vec, |
462 | int nvec, |
463 | enum trackdb_listable what) { |
464 | const char *dir, *re, *errstr; |
465 | int erroffset; |
466 | pcre *rec; |
467 | char **fvec, *key; |
468 | |
469 | switch(nvec) { |
470 | case 0: dir = 0; re = 0; break; |
471 | case 1: dir = vec[0]; re = 0; break; |
472 | case 2: dir = vec[0]; re = vec[1]; break; |
473 | default: abort(); |
474 | } |
475 | /* A bit of a bodge to make sure the args don't trample on cache keys */ |
476 | if(dir && strchr(dir, '\n')) { |
477 | sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n"); |
478 | return 1; |
479 | } |
480 | if(re && strchr(re, '\n')) { |
481 | sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n"); |
482 | return 1; |
483 | } |
484 | /* We bother eliminating "" because the web interface is relatively |
485 | * likely to send it */ |
486 | if(re && *re) { |
487 | byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re); |
488 | fvec = (char **)cache_get(&cache_files_type, key); |
489 | if(fvec) { |
490 | /* Got a cache hit, don't store the answer in the cache */ |
491 | key = 0; |
492 | ++cache_files_hits; |
493 | rec = 0; /* quieten compiler */ |
494 | } else { |
495 | /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer |
496 | * in the cache. */ |
497 | if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8, |
498 | &errstr, &erroffset, 0))) { |
499 | sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n", |
500 | errstr); |
501 | return 1; |
502 | } |
503 | /* It only counts as a miss if the regexp was valid. */ |
504 | ++cache_files_misses; |
505 | } |
506 | } else { |
507 | /* No regexp, don't bother caching the result */ |
508 | rec = 0; |
509 | key = 0; |
510 | fvec = 0; |
511 | } |
512 | if(!fvec) { |
513 | /* No cache hit (either because a miss, or because we did not look) so do |
514 | * the lookup */ |
515 | if(dir && *dir) |
516 | fvec = trackdb_list(dir, 0, what, rec); |
517 | else |
518 | fvec = trackdb_list(0, 0, what, rec); |
519 | } |
520 | if(key) |
521 | /* Put the answer in the cache */ |
522 | cache_put(&cache_files_type, key, fvec); |
523 | sink_writes(ev_writer_sink(c->w), "253 Listing follow\n"); |
524 | return output_list(c, fvec); |
525 | } |
526 | |
527 | static int c_files(struct conn *c, |
528 | char **vec, |
529 | int nvec) { |
530 | return files_dirs(c, vec, nvec, trackdb_files); |
531 | } |
532 | |
533 | static int c_dirs(struct conn *c, |
534 | char **vec, |
535 | int nvec) { |
536 | return files_dirs(c, vec, nvec, trackdb_directories); |
537 | } |
538 | |
539 | static int c_allfiles(struct conn *c, |
540 | char **vec, |
541 | int nvec) { |
542 | return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files); |
543 | } |
544 | |
545 | static int c_get(struct conn *c, |
546 | char **vec, |
547 | int attribute((unused)) nvec) { |
548 | const char *v; |
549 | |
550 | if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1]))) |
551 | sink_printf(ev_writer_sink(c->w), "252 %s\n", v); |
552 | else |
553 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
554 | return 1; |
555 | } |
556 | |
557 | static int c_length(struct conn *c, |
558 | char **vec, |
559 | int attribute((unused)) nvec) { |
560 | const char *track, *v; |
561 | |
562 | if(!(track = trackdb_resolve(vec[0]))) { |
563 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
564 | return 1; |
565 | } |
566 | if((v = trackdb_get(track, "_length"))) |
567 | sink_printf(ev_writer_sink(c->w), "252 %s\n", v); |
568 | else |
569 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
570 | return 1; |
571 | } |
572 | |
573 | static int c_set(struct conn *c, |
574 | char **vec, |
575 | int attribute((unused)) nvec) { |
576 | if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2])) |
577 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
578 | else |
579 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
580 | return 1; |
581 | } |
582 | |
583 | static int c_prefs(struct conn *c, |
584 | char **vec, |
585 | int attribute((unused)) nvec) { |
586 | struct kvp *k; |
587 | |
588 | k = trackdb_get_all(vec[0]); |
589 | sink_writes(ev_writer_sink(c->w), "253 prefs follow\n"); |
590 | for(; k; k = k->next) |
591 | if(k->name[0] != '_') /* omit internal values */ |
592 | sink_printf(ev_writer_sink(c->w), |
593 | " %s %s\n", quoteutf8(k->name), quoteutf8(k->value)); |
594 | sink_writes(ev_writer_sink(c->w), ".\n"); |
595 | return 1; |
596 | } |
597 | |
598 | static int c_exists(struct conn *c, |
599 | char **vec, |
600 | int attribute((unused)) nvec) { |
601 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]); |
602 | return 1; |
603 | } |
604 | |
605 | static void search_parse_error(const char *msg, void *u) { |
606 | *(const char **)u = msg; |
607 | } |
608 | |
609 | static int c_search(struct conn *c, |
610 | char **vec, |
611 | int attribute((unused)) nvec) { |
612 | char **terms, **results; |
613 | int nterms, nresults, n; |
614 | const char *e = "unknown error"; |
615 | |
616 | /* This is a bit of a bodge. Initially it's there to make the eclient |
617 | * interface a bit more convenient to add searching to, but it has the more |
618 | * compelling advantage that if everything uses it, then interpretation of |
619 | * user-supplied search strings will be the same everywhere. */ |
620 | if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) { |
621 | sink_printf(ev_writer_sink(c->w), "550 %s\n", e); |
622 | } else { |
623 | results = trackdb_search(terms, nterms, &nresults); |
624 | sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults); |
625 | for(n = 0; n < nresults; ++n) |
626 | sink_printf(ev_writer_sink(c->w), "%s\n", results[n]); |
627 | sink_writes(ev_writer_sink(c->w), ".\n"); |
628 | } |
629 | return 1; |
630 | } |
631 | |
632 | static int c_random_enable(struct conn *c, |
633 | char attribute((unused)) **vec, |
634 | int attribute((unused)) nvec) { |
635 | enable_random(c->who, c->ev); |
636 | /* Enable implicitly unpauses if there is nothing playing */ |
637 | if(paused && !playing) resume_playing(c->who); |
638 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
639 | return 1; /* completed */ |
640 | } |
641 | |
642 | static int c_random_disable(struct conn *c, |
643 | char attribute((unused)) **vec, |
644 | int attribute((unused)) nvec) { |
645 | disable_random(c->who); |
646 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
647 | return 1; /* completed */ |
648 | } |
649 | |
650 | static int c_random_enabled(struct conn *c, |
651 | char attribute((unused)) **vec, |
652 | int attribute((unused)) nvec) { |
653 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]); |
654 | return 1; /* completed */ |
655 | } |
656 | |
657 | static int c_stats(struct conn *c, |
658 | char attribute((unused)) **vec, |
659 | int attribute((unused)) nvec) { |
660 | char **v; |
661 | int nv, n; |
662 | |
663 | v = trackdb_stats(&nv); |
664 | sink_printf(ev_writer_sink(c->w), "253 stats\n"); |
665 | for(n = 0; n < nv; ++n) { |
666 | if(v[n][0] == '.') |
667 | sink_writes(ev_writer_sink(c->w), "."); |
668 | sink_printf(ev_writer_sink(c->w), "%s\n", v[n]); |
669 | } |
670 | sink_writes(ev_writer_sink(c->w), ".\n"); |
671 | return 1; |
672 | } |
673 | |
674 | static int c_volume(struct conn *c, |
675 | char **vec, |
676 | int nvec) { |
677 | int l, r, set; |
678 | char lb[32], rb[32]; |
679 | |
680 | switch(nvec) { |
681 | case 0: |
682 | set = 0; |
683 | break; |
684 | case 1: |
685 | l = r = atoi(vec[0]); |
686 | set = 1; |
687 | break; |
688 | case 2: |
689 | l = atoi(vec[0]); |
690 | r = atoi(vec[1]); |
691 | set = 1; |
692 | break; |
693 | default: |
694 | abort(); |
695 | } |
696 | if(mixer_control(&l, &r, set)) |
697 | sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n"); |
698 | else { |
699 | sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r); |
700 | if(l != volume_left || r != volume_right) { |
701 | volume_left = l; |
702 | volume_right = r; |
703 | snprintf(lb, sizeof lb, "%d", l); |
704 | snprintf(rb, sizeof rb, "%d", r); |
705 | eventlog("volume", lb, rb, (char *)0); |
706 | } |
707 | } |
708 | return 1; |
709 | } |
710 | |
711 | /* we are logging, and some data is available to read */ |
712 | static int logging_reader_callback(ev_source *ev, |
713 | ev_reader *reader, |
714 | int fd, |
715 | void *ptr, |
716 | size_t bytes, |
717 | int eof, |
718 | void *u) { |
719 | struct conn *c = u; |
720 | |
721 | /* don't log to this conn any more */ |
722 | eventlog_remove(c->lo); |
723 | /* terminate the log output */ |
724 | sink_writes(ev_writer_sink(c->w), ".\n"); |
725 | /* restore the reader callback */ |
726 | c->reader = reader_callback; |
727 | /* ...and exit via it */ |
728 | return c->reader(ev, reader, fd, ptr, bytes, eof, u); |
729 | } |
730 | |
731 | static void logclient(const char *msg, void *user) { |
732 | struct conn *c = user; |
733 | |
734 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n", |
735 | (uintmax_t)time(0), msg); |
736 | } |
737 | |
738 | static int c_log(struct conn *c, |
739 | char attribute((unused)) **vec, |
740 | int attribute((unused)) nvec) { |
741 | time_t now; |
742 | |
743 | sink_writes(ev_writer_sink(c->w), "254 OK\n"); |
744 | /* pump out initial state */ |
745 | time(&now); |
746 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
747 | (uintmax_t)now, |
748 | playing_is_enabled() ? "enable_play" : "disable_play"); |
749 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
750 | (uintmax_t)now, |
751 | random_is_enabled() ? "enable_random" : "disable_random"); |
752 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
753 | (uintmax_t)now, |
754 | paused ? "pause" : "resume"); |
755 | c->lo = xmalloc(sizeof *c->lo); |
756 | c->lo->fn = logclient; |
757 | c->lo->user = c; |
758 | eventlog_add(c->lo); |
759 | c->reader = logging_reader_callback; |
760 | return 0; |
761 | } |
762 | |
763 | static void post_move_cleanup(void) { |
764 | struct queue_entry *q; |
765 | |
766 | /* If we have caused the random track to not be at the end then we make it no |
767 | * longer be random. */ |
768 | for(q = qhead.next; q != &qhead; q = q->next) |
769 | if(q->state == playing_random && q->next != &qhead) |
770 | q->state = playing_unplayed; |
771 | /* That might mean we need to add a new random track. */ |
772 | add_random_track(); |
773 | queue_write(); |
774 | } |
775 | |
776 | static int c_move(struct conn *c, |
777 | char **vec, |
778 | int attribute((unused)) nvec) { |
779 | struct queue_entry *q; |
780 | int n; |
781 | |
782 | if(config->restrictions & RESTRICT_MOVE) { |
783 | if(!trusted(c)) { |
784 | sink_writes(ev_writer_sink(c->w), |
785 | "550 only trusted users can move tracks\n"); |
786 | return 1; |
787 | } |
788 | } |
789 | if(!(q = queue_find(vec[0]))) { |
790 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
791 | return 1; |
792 | } |
793 | n = queue_move(q, atoi(vec[1]), c->who); |
794 | post_move_cleanup(); |
795 | sink_printf(ev_writer_sink(c->w), "252 %d\n", n); |
796 | /* If we've moved to the head of the queue then prepare the track. */ |
797 | if(q == qhead.next) |
798 | prepare(c->ev, q); |
799 | return 1; |
800 | } |
801 | |
802 | static int c_moveafter(struct conn *c, |
803 | char **vec, |
804 | int attribute((unused)) nvec) { |
805 | struct queue_entry *q, **qs; |
806 | int n; |
807 | |
808 | if(config->restrictions & RESTRICT_MOVE) { |
809 | if(!trusted(c)) { |
810 | sink_writes(ev_writer_sink(c->w), |
811 | "550 only trusted users can move tracks\n"); |
812 | return 1; |
813 | } |
814 | } |
815 | if(vec[0][0]) { |
816 | if(!(q = queue_find(vec[0]))) { |
817 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
818 | return 1; |
819 | } |
820 | } else |
821 | q = 0; |
822 | ++vec; |
823 | --nvec; |
824 | qs = xcalloc(nvec, sizeof *qs); |
825 | for(n = 0; n < nvec; ++n) |
826 | if(!(qs[n] = queue_find(vec[n]))) { |
827 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
828 | return 1; |
829 | } |
830 | queue_moveafter(q, nvec, qs, c->who); |
831 | post_move_cleanup(); |
832 | sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n"); |
833 | /* If we've moved to the head of the queue then prepare the track. */ |
834 | if(q == qhead.next) |
835 | prepare(c->ev, q); |
836 | return 1; |
837 | } |
838 | |
839 | static int c_part(struct conn *c, |
840 | char **vec, |
841 | int attribute((unused)) nvec) { |
842 | sink_printf(ev_writer_sink(c->w), "252 %s\n", |
843 | trackdb_getpart(vec[0], vec[1], vec[2])); |
844 | return 1; |
845 | } |
846 | |
847 | static int c_resolve(struct conn *c, |
848 | char **vec, |
849 | int attribute((unused)) nvec) { |
850 | const char *track; |
851 | |
852 | if(!(track = trackdb_resolve(vec[0]))) { |
853 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
854 | return 1; |
855 | } |
856 | sink_printf(ev_writer_sink(c->w), "252 %s\n", track); |
857 | return 1; |
858 | } |
859 | |
860 | static int c_tags(struct conn *c, |
861 | char attribute((unused)) **vec, |
862 | int attribute((unused)) nvec) { |
863 | char **tags = trackdb_alltags(); |
864 | |
865 | sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n"); |
866 | while(*tags) { |
867 | sink_printf(ev_writer_sink(c->w), "%s%s\n", |
868 | **tags == '.' ? "." : "", *tags); |
869 | ++tags; |
870 | } |
871 | sink_writes(ev_writer_sink(c->w), ".\n"); |
872 | return 1; /* completed */ |
873 | |
874 | } |
875 | |
876 | static int c_set_global(struct conn *c, |
877 | char **vec, |
878 | int attribute((unused)) nvec) { |
879 | trackdb_set_global(vec[0], vec[1], c->who); |
880 | sink_printf(ev_writer_sink(c->w), "250 OK\n"); |
881 | return 1; |
882 | } |
883 | |
884 | static int c_get_global(struct conn *c, |
885 | char **vec, |
886 | int attribute((unused)) nvec) { |
887 | const char *s = trackdb_get_global(vec[0]); |
888 | |
889 | if(s) |
890 | sink_printf(ev_writer_sink(c->w), "252 %s\n", s); |
891 | else |
892 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
893 | return 1; |
894 | } |
895 | |
896 | #define C_AUTH 0001 /* must be authenticated */ |
897 | #define C_TRUSTED 0002 /* must be trusted user */ |
898 | |
899 | static const struct command { |
900 | const char *name; |
901 | int minargs, maxargs; |
902 | int (*fn)(struct conn *, char **, int); |
903 | unsigned flags; |
904 | } commands[] = { |
905 | { "allfiles", 0, 2, c_allfiles, C_AUTH }, |
906 | { "become", 1, 1, c_become, C_AUTH|C_TRUSTED }, |
907 | { "dirs", 0, 2, c_dirs, C_AUTH }, |
908 | { "disable", 0, 1, c_disable, C_AUTH }, |
909 | { "enable", 0, 0, c_enable, C_AUTH }, |
910 | { "enabled", 0, 0, c_enabled, C_AUTH }, |
911 | { "exists", 1, 1, c_exists, C_AUTH }, |
912 | { "files", 0, 2, c_files, C_AUTH }, |
913 | { "get", 2, 2, c_get, C_AUTH }, |
914 | { "get-global", 1, 1, c_get_global, C_AUTH }, |
915 | { "length", 1, 1, c_length, C_AUTH }, |
916 | { "log", 0, 0, c_log, C_AUTH }, |
917 | { "move", 2, 2, c_move, C_AUTH }, |
918 | { "moveafter", 1, INT_MAX, c_moveafter, C_AUTH }, |
919 | { "part", 3, 3, c_part, C_AUTH }, |
920 | { "pause", 0, 0, c_pause, C_AUTH }, |
921 | { "play", 1, 1, c_play, C_AUTH }, |
922 | { "playing", 0, 0, c_playing, C_AUTH }, |
923 | { "prefs", 1, 1, c_prefs, C_AUTH }, |
924 | { "queue", 0, 0, c_queue, C_AUTH }, |
925 | { "random-disable", 0, 0, c_random_disable, C_AUTH }, |
926 | { "random-enable", 0, 0, c_random_enable, C_AUTH }, |
927 | { "random-enabled", 0, 0, c_random_enabled, C_AUTH }, |
928 | { "recent", 0, 0, c_recent, C_AUTH }, |
929 | { "reconfigure", 0, 0, c_reconfigure, C_AUTH|C_TRUSTED }, |
930 | { "remove", 1, 1, c_remove, C_AUTH }, |
931 | { "rescan", 0, 0, c_rescan, C_AUTH|C_TRUSTED }, |
932 | { "resolve", 1, 1, c_resolve, C_AUTH }, |
933 | { "resume", 0, 0, c_resume, C_AUTH }, |
934 | { "scratch", 0, 1, c_scratch, C_AUTH }, |
935 | { "search", 1, 1, c_search, C_AUTH }, |
936 | { "set", 3, 3, c_set, C_AUTH, }, |
937 | { "set-global", 2, 2, c_set_global, C_AUTH }, |
938 | { "shutdown", 0, 0, c_shutdown, C_AUTH|C_TRUSTED }, |
939 | { "stats", 0, 0, c_stats, C_AUTH }, |
940 | { "tags", 0, 0, c_tags, C_AUTH }, |
941 | { "unset", 2, 2, c_set, C_AUTH }, |
942 | { "unset-global", 1, 1, c_set_global, C_AUTH }, |
943 | { "user", 2, 2, c_user, 0 }, |
944 | { "version", 0, 0, c_version, C_AUTH }, |
945 | { "volume", 0, 2, c_volume, C_AUTH } |
946 | }; |
947 | |
948 | static void command_error(const char *msg, void *u) { |
949 | struct conn *c = u; |
950 | |
951 | sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg); |
952 | } |
953 | |
954 | /* process a command. Return 1 if complete, 0 if incomplete. */ |
955 | static int command(struct conn *c, char *line) { |
956 | char **vec; |
957 | int nvec, n; |
958 | |
959 | D(("server command %s", line)); |
960 | if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) { |
961 | sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n"); |
962 | return 1; |
963 | } |
964 | if(nvec == 0) { |
965 | sink_writes(ev_writer_sink(c->w), "500 do what?\n"); |
966 | return 1; |
967 | } |
968 | if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0) |
969 | sink_writes(ev_writer_sink(c->w), "500 unknown command\n"); |
970 | else { |
971 | if((commands[n].flags & C_AUTH) && !c->who) { |
972 | sink_writes(ev_writer_sink(c->w), "530 not authenticated\n"); |
973 | return 1; |
974 | } |
975 | if((commands[n].flags & C_TRUSTED) && !trusted(c)) { |
976 | sink_writes(ev_writer_sink(c->w), "530 insufficient privilege\n"); |
977 | return 1; |
978 | } |
979 | ++vec; |
980 | --nvec; |
981 | if(nvec < commands[n].minargs) { |
982 | sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n"); |
983 | return 1; |
984 | } |
985 | if(nvec > commands[n].maxargs) { |
986 | sink_writes(ev_writer_sink(c->w), "500 too many arguments\n"); |
987 | return 1; |
988 | } |
989 | return commands[n].fn(c, vec, nvec); |
990 | } |
991 | return 1; /* completed */ |
992 | } |
993 | |
994 | /* redirect to the right reader callback for our current state */ |
995 | static int redirect_reader_callback(ev_source *ev, |
996 | ev_reader *reader, |
997 | int fd, |
998 | void *ptr, |
999 | size_t bytes, |
1000 | int eof, |
1001 | void *u) { |
1002 | struct conn *c = u; |
1003 | |
1004 | return c->reader(ev, reader, fd, ptr, bytes, eof, u); |
1005 | } |
1006 | |
1007 | /* the main command reader */ |
1008 | static int reader_callback(ev_source attribute((unused)) *ev, |
1009 | ev_reader *reader, |
1010 | int attribute((unused)) fd, |
1011 | void *ptr, |
1012 | size_t bytes, |
1013 | int eof, |
1014 | void *u) { |
1015 | struct conn *c = u; |
1016 | char *eol; |
1017 | int complete; |
1018 | |
1019 | D(("server reader_callback")); |
1020 | while((eol = memchr(ptr, '\n', bytes))) { |
1021 | *eol++ = 0; |
1022 | ev_reader_consume(reader, eol - (char *)ptr); |
1023 | complete = command(c, ptr); |
1024 | bytes -= (eol - (char *)ptr); |
1025 | ptr = eol; |
1026 | if(!complete) { |
1027 | /* the command had better have set a new reader callback */ |
1028 | if(bytes || eof) |
1029 | /* there are further bytes to read, or we are at eof; arrange for the |
1030 | * command's reader callback to handle them */ |
1031 | return ev_reader_incomplete(reader); |
1032 | /* nothing's going on right now */ |
1033 | return 0; |
1034 | } |
1035 | /* command completed, we can go around and handle the next one */ |
1036 | } |
1037 | if(eof) { |
1038 | if(bytes) |
1039 | error(0, "S%x unterminated line", c->tag); |
1040 | c->r = 0; |
1041 | return ev_writer_close(c->w); |
1042 | } |
1043 | return 0; |
1044 | } |
1045 | |
1046 | static int listen_callback(ev_source *ev, |
1047 | int fd, |
1048 | const struct sockaddr attribute((unused)) *remote, |
1049 | socklen_t attribute((unused)) rlen, |
1050 | void *u) { |
1051 | const struct listener *l = u; |
1052 | struct conn *c = xmalloc(sizeof *c); |
1053 | static unsigned tags; |
1054 | |
1055 | D(("server listen_callback fd %d (%s)", fd, l->name)); |
1056 | nonblock(fd); |
1057 | cloexec(fd); |
1058 | c->tag = tags++; |
1059 | c->ev = ev; |
1060 | c->w = ev_writer_new(ev, fd, writer_error, c); |
1061 | c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c); |
1062 | c->fd = fd; |
1063 | c->reader = reader_callback; |
1064 | c->l = l; |
1065 | gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM); |
1066 | sink_printf(ev_writer_sink(c->w), "231 %s\n", hex(c->nonce, sizeof c->nonce)); |
1067 | return 0; |
1068 | } |
1069 | |
1070 | int server_start(ev_source *ev, int pf, |
1071 | size_t socklen, const struct sockaddr *sa, |
1072 | const char *name) { |
1073 | int fd; |
1074 | struct listener *l = xmalloc(sizeof *l); |
1075 | static const int one = 1; |
1076 | |
1077 | D(("server_init socket %s", name)); |
1078 | fd = xsocket(pf, SOCK_STREAM, 0); |
1079 | xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one); |
1080 | if(bind(fd, sa, socklen) < 0) { |
1081 | error(errno, "error binding to %s", name); |
1082 | return -1; |
1083 | } |
1084 | xlisten(fd, 128); |
1085 | nonblock(fd); |
1086 | cloexec(fd); |
1087 | l->name = name; |
1088 | l->pf = pf; |
1089 | if(ev_listen(ev, fd, listen_callback, l)) exit(EXIT_FAILURE); |
1090 | return fd; |
1091 | } |
1092 | |
1093 | int server_stop(ev_source *ev, int fd) { |
1094 | xclose(fd); |
1095 | return ev_listen_cancel(ev, fd); |
1096 | } |
1097 | |
1098 | /* |
1099 | Local Variables: |
1100 | c-basic-offset:2 |
1101 | comment-column:40 |
1102 | fill-column:79 |
1103 | End: |
1104 | */ |