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 | |
18e6d6e6 |
72 | /** @brief Accept all well-formed login attempts |
73 | * |
74 | * Used in debugging. |
75 | */ |
76 | int wideopen; |
77 | |
460b9539 |
78 | struct listener { |
79 | const char *name; |
80 | int pf; |
81 | }; |
82 | |
83 | struct conn { |
84 | ev_reader *r; |
85 | ev_writer *w; |
86 | int fd; |
87 | unsigned tag; |
88 | char *who; |
89 | ev_source *ev; |
90 | unsigned char nonce[NONCE_SIZE]; |
91 | ev_reader_callback *reader; |
92 | struct eventlog_output *lo; |
93 | const struct listener *l; |
94 | }; |
95 | |
96 | static int reader_callback(ev_source *ev, |
97 | ev_reader *reader, |
98 | int fd, |
99 | void *ptr, |
100 | size_t bytes, |
101 | int eof, |
102 | void *u); |
103 | |
104 | static const char *noyes[] = { "no", "yes" }; |
105 | |
106 | static int writer_error(ev_source attribute((unused)) *ev, |
107 | int fd, |
108 | int errno_value, |
109 | void *u) { |
110 | struct conn *c = u; |
111 | |
112 | D(("server writer_error %d %d", fd, errno_value)); |
113 | if(errno_value == 0) { |
114 | /* writer is done */ |
115 | c->w = 0; |
116 | if(c->r == 0) { |
117 | D(("server writer_error closes %d", fd)); |
118 | xclose(fd); /* reader is done too, close */ |
119 | } else { |
120 | D(("server writer_error shutdown %d SHUT_WR", fd)); |
121 | xshutdown(fd, SHUT_WR); /* reader is not done yet */ |
122 | } |
123 | } else { |
124 | if(errno_value != EPIPE) |
125 | error(errno_value, "S%x write error on socket", c->tag); |
126 | if(c->r) |
127 | ev_reader_cancel(c->r); |
128 | xclose(fd); |
129 | } |
130 | return 0; |
131 | } |
132 | |
133 | static int reader_error(ev_source attribute((unused)) *ev, |
134 | int fd, |
135 | int errno_value, |
136 | void *u) { |
137 | struct conn *c = u; |
138 | |
139 | D(("server reader_error %d %d", fd, errno_value)); |
140 | error(errno, "S%x read error on socket", c->tag); |
141 | ev_writer_cancel(c->w); |
142 | xclose(fd); |
143 | return 0; |
144 | } |
145 | |
146 | /* return true if we are talking to a trusted user */ |
147 | static int trusted(struct conn *c) { |
148 | int n; |
149 | |
150 | for(n = 0; (n < config->trust.n |
151 | && strcmp(config->trust.s[n], c->who)); ++n) |
152 | ; |
153 | return n < config->trust.n; |
154 | } |
155 | |
156 | static int c_disable(struct conn *c, char **vec, int nvec) { |
157 | if(nvec == 0) |
158 | disable_playing(c->who); |
159 | else if(nvec == 1 && !strcmp(vec[0], "now")) |
160 | disable_playing(c->who); |
161 | else { |
162 | sink_writes(ev_writer_sink(c->w), "550 invalid argument\n"); |
163 | return 1; /* completed */ |
164 | } |
165 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
166 | return 1; /* completed */ |
167 | } |
168 | |
169 | static int c_enable(struct conn *c, |
170 | char attribute((unused)) **vec, |
171 | int attribute((unused)) nvec) { |
172 | enable_playing(c->who, c->ev); |
173 | /* Enable implicitly unpauses if there is nothing playing */ |
174 | if(paused && !playing) resume_playing(c->who); |
175 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
176 | return 1; /* completed */ |
177 | } |
178 | |
179 | static int c_enabled(struct conn *c, |
180 | char attribute((unused)) **vec, |
181 | int attribute((unused)) nvec) { |
182 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]); |
183 | return 1; /* completed */ |
184 | } |
185 | |
186 | static int c_play(struct conn *c, char **vec, |
187 | int attribute((unused)) nvec) { |
188 | const char *track; |
189 | struct queue_entry *q; |
190 | |
191 | if(!trackdb_exists(vec[0])) { |
192 | sink_writes(ev_writer_sink(c->w), "550 track is not in database\n"); |
193 | return 1; |
194 | } |
195 | if(!(track = trackdb_resolve(vec[0]))) { |
196 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
197 | return 1; |
198 | } |
199 | q = queue_add(track, c->who, WHERE_BEFORE_RANDOM); |
200 | queue_write(); |
201 | /* If we added the first track, and something is playing, then prepare the |
202 | * new track. If nothing is playing then we don't bother as it wouldn't gain |
203 | * anything. */ |
204 | if(q == qhead.next && playing) |
205 | prepare(c->ev, q); |
206 | sink_writes(ev_writer_sink(c->w), "250 queued\n"); |
207 | /* If the queue was empty but we are for some reason paused then |
208 | * unpause. */ |
209 | if(!playing) resume_playing(0); |
210 | play(c->ev); |
211 | return 1; /* completed */ |
212 | } |
213 | |
214 | static int c_remove(struct conn *c, char **vec, |
215 | int attribute((unused)) nvec) { |
216 | struct queue_entry *q; |
217 | |
218 | if(!(q = queue_find(vec[0]))) { |
219 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
220 | return 1; |
221 | } |
222 | if(config->restrictions & RESTRICT_REMOVE) { |
223 | /* can only remove tracks that you submitted */ |
224 | if(!q->submitter || strcmp(q->submitter, c->who)) { |
225 | sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); |
226 | return 1; |
227 | } |
228 | } |
229 | queue_remove(q, c->who); |
230 | /* De-prepare the track. */ |
231 | abandon(c->ev, q); |
232 | /* If we removed the random track then add another one. */ |
233 | if(q->state == playing_random) |
234 | add_random_track(); |
235 | /* Prepare whatever the next head track is. */ |
236 | if(qhead.next != &qhead) |
237 | prepare(c->ev, qhead.next); |
238 | queue_write(); |
239 | sink_writes(ev_writer_sink(c->w), "250 removed\n"); |
240 | return 1; /* completed */ |
241 | } |
242 | |
243 | static int c_scratch(struct conn *c, |
244 | char **vec, |
245 | int nvec) { |
246 | if(!playing) { |
247 | sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n"); |
248 | return 1; /* completed */ |
249 | } |
250 | if(config->restrictions & RESTRICT_SCRATCH) { |
251 | /* can only scratch tracks you submitted and randomly selected ones */ |
252 | if(playing->submitter && strcmp(playing->submitter, c->who)) { |
253 | sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); |
254 | return 1; |
255 | } |
256 | } |
257 | scratch(c->who, nvec == 1 ? vec[0] : 0); |
258 | /* If you scratch an unpaused track then it is automatically unpaused */ |
259 | resume_playing(0); |
260 | sink_writes(ev_writer_sink(c->w), "250 scratched\n"); |
261 | return 1; /* completed */ |
262 | } |
263 | |
264 | static int c_pause(struct conn *c, |
265 | char attribute((unused)) **vec, |
266 | int attribute((unused)) nvec) { |
267 | if(!playing) { |
268 | sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n"); |
269 | return 1; /* completed */ |
270 | } |
271 | if(paused) { |
272 | sink_writes(ev_writer_sink(c->w), "250 already paused\n"); |
273 | return 1; /* completed */ |
274 | } |
275 | if(pause_playing(c->who) < 0) |
276 | sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n"); |
277 | else |
278 | sink_writes(ev_writer_sink(c->w), "250 paused\n"); |
279 | return 1; |
280 | } |
281 | |
282 | static int c_resume(struct conn *c, |
283 | char attribute((unused)) **vec, |
284 | int attribute((unused)) nvec) { |
285 | if(!paused) { |
286 | sink_writes(ev_writer_sink(c->w), "250 not paused\n"); |
287 | return 1; /* completed */ |
288 | } |
289 | resume_playing(c->who); |
290 | sink_writes(ev_writer_sink(c->w), "250 paused\n"); |
291 | return 1; |
292 | } |
293 | |
294 | static int c_shutdown(struct conn *c, |
295 | char attribute((unused)) **vec, |
296 | int attribute((unused)) nvec) { |
297 | info("S%x shut down by %s", c->tag, c->who); |
298 | sink_writes(ev_writer_sink(c->w), "250 shutting down\n"); |
299 | ev_writer_flush(c->w); |
300 | quit(c->ev); |
301 | } |
302 | |
303 | static int c_reconfigure(struct conn *c, |
304 | char attribute((unused)) **vec, |
305 | int attribute((unused)) nvec) { |
306 | info("S%x reconfigure by %s", c->tag, c->who); |
307 | if(reconfigure(c->ev, 1)) |
308 | sink_writes(ev_writer_sink(c->w), "550 error reading new config\n"); |
309 | else |
310 | sink_writes(ev_writer_sink(c->w), "250 installed new config\n"); |
311 | return 1; /* completed */ |
312 | } |
313 | |
314 | static int c_rescan(struct conn *c, |
315 | char attribute((unused)) **vec, |
316 | int attribute((unused)) nvec) { |
317 | info("S%x rescan by %s", c->tag, c->who); |
318 | trackdb_rescan(c->ev); |
319 | sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n"); |
320 | return 1; /* completed */ |
321 | } |
322 | |
323 | static int c_version(struct conn *c, |
324 | char attribute((unused)) **vec, |
325 | int attribute((unused)) nvec) { |
326 | /* VERSION had better only use the basic character set */ |
327 | sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_version_string); |
328 | return 1; /* completed */ |
329 | } |
330 | |
331 | static int c_playing(struct conn *c, |
332 | char attribute((unused)) **vec, |
333 | int attribute((unused)) nvec) { |
334 | if(playing) { |
335 | queue_fix_sofar(playing); |
336 | playing->expected = 0; |
337 | sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing)); |
338 | } else |
339 | sink_printf(ev_writer_sink(c->w), "259 nothing playing\n"); |
340 | return 1; /* completed */ |
341 | } |
342 | |
343 | static int c_become(struct conn *c, |
344 | char **vec, |
345 | int attribute((unused)) nvec) { |
346 | c->who = vec[0]; |
347 | sink_writes(ev_writer_sink(c->w), "230 OK\n"); |
348 | return 1; |
349 | } |
350 | |
351 | static int c_user(struct conn *c, |
352 | char **vec, |
353 | int attribute((unused)) nvec) { |
354 | int n; |
355 | const char *res; |
356 | union { |
357 | struct sockaddr sa; |
358 | struct sockaddr_in in; |
359 | struct sockaddr_in6 in6; |
360 | } u; |
361 | socklen_t l; |
362 | char host[1024]; |
363 | |
364 | if(c->who) { |
365 | sink_writes(ev_writer_sink(c->w), "530 already authenticated\n"); |
366 | return 1; |
367 | } |
368 | /* get connection data */ |
369 | l = sizeof u; |
370 | if(getpeername(c->fd, &u.sa, &l) < 0) { |
371 | error(errno, "S%x error calling getpeername", c->tag); |
372 | sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); |
373 | return 1; |
374 | } |
375 | if(c->l->pf != PF_UNIX) { |
376 | if((n = getnameinfo(&u.sa, l, |
377 | host, sizeof host, 0, 0, NI_NUMERICHOST))) { |
378 | error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n)); |
379 | sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); |
380 | return 1; |
381 | } |
18e6d6e6 |
382 | } else |
383 | strcpy(host, "local"); |
460b9539 |
384 | /* find the user */ |
385 | for(n = 0; n < config->allow.n |
386 | && strcmp(config->allow.s[n].s[0], vec[0]); ++n) |
387 | ; |
388 | /* if it's a real user check whether the response is right */ |
18e6d6e6 |
389 | if(n >= config->allow.n) { |
390 | info("S%x unknown user '%s' from %s", c->tag, vec[0], host); |
391 | sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); |
392 | return 1; |
393 | } |
394 | res = authhash(c->nonce, sizeof c->nonce, config->allow.s[n].s[1]); |
395 | if(wideopen || (res && !strcmp(res, vec[1]))) { |
396 | c->who = vec[0]; |
397 | /* currently we only bother logging remote connections */ |
398 | if(c->l->pf != PF_UNIX) |
399 | info("S%x %s connected from %s", c->tag, vec[0], host); |
400 | sink_writes(ev_writer_sink(c->w), "230 OK\n"); |
401 | return 1; |
460b9539 |
402 | } |
403 | /* oops, response was wrong */ |
18e6d6e6 |
404 | info("S%x authentication failure for %s from %s", c->tag, vec[0], host); |
460b9539 |
405 | sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); |
406 | return 1; |
407 | } |
408 | |
409 | static int c_recent(struct conn *c, |
410 | char attribute((unused)) **vec, |
411 | int attribute((unused)) nvec) { |
412 | const struct queue_entry *q; |
413 | |
414 | sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n"); |
415 | for(q = phead.next; q != &phead; q = q->next) |
416 | sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q)); |
417 | sink_writes(ev_writer_sink(c->w), ".\n"); |
418 | return 1; /* completed */ |
419 | } |
420 | |
421 | static int c_queue(struct conn *c, |
422 | char attribute((unused)) **vec, |
423 | int attribute((unused)) nvec) { |
424 | struct queue_entry *q; |
425 | time_t when = 0; |
426 | const char *l; |
427 | long length; |
428 | |
429 | sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n"); |
430 | if(playing_is_enabled() && !paused) { |
431 | if(playing) { |
432 | queue_fix_sofar(playing); |
433 | if((l = trackdb_get(playing->track, "_length")) |
434 | && (length = atol(l))) { |
435 | time(&when); |
436 | when += length - playing->sofar + config->gap; |
437 | } |
438 | } else |
439 | /* Nothing is playing but playing is enabled, so whatever is |
440 | * first in the queue can be expected to start immediately. */ |
441 | time(&when); |
442 | } |
443 | for(q = qhead.next; q != &qhead; q = q->next) { |
444 | /* fill in estimated start time */ |
445 | q->expected = when; |
446 | sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q)); |
447 | /* update for next track */ |
448 | if(when) { |
449 | if((l = trackdb_get(q->track, "_length")) |
450 | && (length = atol(l))) |
451 | when += length + config->gap; |
452 | else |
453 | when = 0; |
454 | } |
455 | } |
456 | sink_writes(ev_writer_sink(c->w), ".\n"); |
457 | return 1; /* completed */ |
458 | } |
459 | |
460 | static int output_list(struct conn *c, char **vec) { |
461 | while(*vec) |
462 | sink_printf(ev_writer_sink(c->w), "%s\n", *vec++); |
463 | sink_writes(ev_writer_sink(c->w), ".\n"); |
464 | return 1; |
465 | } |
466 | |
467 | static int files_dirs(struct conn *c, |
468 | char **vec, |
469 | int nvec, |
470 | enum trackdb_listable what) { |
471 | const char *dir, *re, *errstr; |
472 | int erroffset; |
473 | pcre *rec; |
474 | char **fvec, *key; |
475 | |
476 | switch(nvec) { |
477 | case 0: dir = 0; re = 0; break; |
478 | case 1: dir = vec[0]; re = 0; break; |
479 | case 2: dir = vec[0]; re = vec[1]; break; |
480 | default: abort(); |
481 | } |
482 | /* A bit of a bodge to make sure the args don't trample on cache keys */ |
483 | if(dir && strchr(dir, '\n')) { |
484 | sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n"); |
485 | return 1; |
486 | } |
487 | if(re && strchr(re, '\n')) { |
488 | sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n"); |
489 | return 1; |
490 | } |
491 | /* We bother eliminating "" because the web interface is relatively |
492 | * likely to send it */ |
493 | if(re && *re) { |
494 | byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re); |
495 | fvec = (char **)cache_get(&cache_files_type, key); |
496 | if(fvec) { |
497 | /* Got a cache hit, don't store the answer in the cache */ |
498 | key = 0; |
499 | ++cache_files_hits; |
500 | rec = 0; /* quieten compiler */ |
501 | } else { |
502 | /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer |
503 | * in the cache. */ |
504 | if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8, |
505 | &errstr, &erroffset, 0))) { |
506 | sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n", |
507 | errstr); |
508 | return 1; |
509 | } |
510 | /* It only counts as a miss if the regexp was valid. */ |
511 | ++cache_files_misses; |
512 | } |
513 | } else { |
514 | /* No regexp, don't bother caching the result */ |
515 | rec = 0; |
516 | key = 0; |
517 | fvec = 0; |
518 | } |
519 | if(!fvec) { |
520 | /* No cache hit (either because a miss, or because we did not look) so do |
521 | * the lookup */ |
522 | if(dir && *dir) |
523 | fvec = trackdb_list(dir, 0, what, rec); |
524 | else |
525 | fvec = trackdb_list(0, 0, what, rec); |
526 | } |
527 | if(key) |
528 | /* Put the answer in the cache */ |
529 | cache_put(&cache_files_type, key, fvec); |
530 | sink_writes(ev_writer_sink(c->w), "253 Listing follow\n"); |
531 | return output_list(c, fvec); |
532 | } |
533 | |
534 | static int c_files(struct conn *c, |
535 | char **vec, |
536 | int nvec) { |
537 | return files_dirs(c, vec, nvec, trackdb_files); |
538 | } |
539 | |
540 | static int c_dirs(struct conn *c, |
541 | char **vec, |
542 | int nvec) { |
543 | return files_dirs(c, vec, nvec, trackdb_directories); |
544 | } |
545 | |
546 | static int c_allfiles(struct conn *c, |
547 | char **vec, |
548 | int nvec) { |
549 | return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files); |
550 | } |
551 | |
552 | static int c_get(struct conn *c, |
553 | char **vec, |
554 | int attribute((unused)) nvec) { |
555 | const char *v; |
556 | |
557 | if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1]))) |
558 | sink_printf(ev_writer_sink(c->w), "252 %s\n", v); |
559 | else |
560 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
561 | return 1; |
562 | } |
563 | |
564 | static int c_length(struct conn *c, |
565 | char **vec, |
566 | int attribute((unused)) nvec) { |
567 | const char *track, *v; |
568 | |
569 | if(!(track = trackdb_resolve(vec[0]))) { |
570 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
571 | return 1; |
572 | } |
573 | if((v = trackdb_get(track, "_length"))) |
574 | sink_printf(ev_writer_sink(c->w), "252 %s\n", v); |
575 | else |
576 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
577 | return 1; |
578 | } |
579 | |
580 | static int c_set(struct conn *c, |
581 | char **vec, |
582 | int attribute((unused)) nvec) { |
583 | if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2])) |
584 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
585 | else |
586 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
587 | return 1; |
588 | } |
589 | |
590 | static int c_prefs(struct conn *c, |
591 | char **vec, |
592 | int attribute((unused)) nvec) { |
593 | struct kvp *k; |
594 | |
595 | k = trackdb_get_all(vec[0]); |
596 | sink_writes(ev_writer_sink(c->w), "253 prefs follow\n"); |
597 | for(; k; k = k->next) |
598 | if(k->name[0] != '_') /* omit internal values */ |
599 | sink_printf(ev_writer_sink(c->w), |
600 | " %s %s\n", quoteutf8(k->name), quoteutf8(k->value)); |
601 | sink_writes(ev_writer_sink(c->w), ".\n"); |
602 | return 1; |
603 | } |
604 | |
605 | static int c_exists(struct conn *c, |
606 | char **vec, |
607 | int attribute((unused)) nvec) { |
608 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]); |
609 | return 1; |
610 | } |
611 | |
612 | static void search_parse_error(const char *msg, void *u) { |
613 | *(const char **)u = msg; |
614 | } |
615 | |
616 | static int c_search(struct conn *c, |
617 | char **vec, |
618 | int attribute((unused)) nvec) { |
619 | char **terms, **results; |
620 | int nterms, nresults, n; |
621 | const char *e = "unknown error"; |
622 | |
623 | /* This is a bit of a bodge. Initially it's there to make the eclient |
624 | * interface a bit more convenient to add searching to, but it has the more |
625 | * compelling advantage that if everything uses it, then interpretation of |
626 | * user-supplied search strings will be the same everywhere. */ |
627 | if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) { |
628 | sink_printf(ev_writer_sink(c->w), "550 %s\n", e); |
629 | } else { |
630 | results = trackdb_search(terms, nterms, &nresults); |
631 | sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults); |
632 | for(n = 0; n < nresults; ++n) |
633 | sink_printf(ev_writer_sink(c->w), "%s\n", results[n]); |
634 | sink_writes(ev_writer_sink(c->w), ".\n"); |
635 | } |
636 | return 1; |
637 | } |
638 | |
639 | static int c_random_enable(struct conn *c, |
640 | char attribute((unused)) **vec, |
641 | int attribute((unused)) nvec) { |
642 | enable_random(c->who, c->ev); |
643 | /* Enable implicitly unpauses if there is nothing playing */ |
644 | if(paused && !playing) resume_playing(c->who); |
645 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
646 | return 1; /* completed */ |
647 | } |
648 | |
649 | static int c_random_disable(struct conn *c, |
650 | char attribute((unused)) **vec, |
651 | int attribute((unused)) nvec) { |
652 | disable_random(c->who); |
653 | sink_writes(ev_writer_sink(c->w), "250 OK\n"); |
654 | return 1; /* completed */ |
655 | } |
656 | |
657 | static int c_random_enabled(struct conn *c, |
658 | char attribute((unused)) **vec, |
659 | int attribute((unused)) nvec) { |
660 | sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]); |
661 | return 1; /* completed */ |
662 | } |
663 | |
664 | static int c_stats(struct conn *c, |
665 | char attribute((unused)) **vec, |
666 | int attribute((unused)) nvec) { |
667 | char **v; |
668 | int nv, n; |
669 | |
670 | v = trackdb_stats(&nv); |
671 | sink_printf(ev_writer_sink(c->w), "253 stats\n"); |
672 | for(n = 0; n < nv; ++n) { |
673 | if(v[n][0] == '.') |
674 | sink_writes(ev_writer_sink(c->w), "."); |
675 | sink_printf(ev_writer_sink(c->w), "%s\n", v[n]); |
676 | } |
677 | sink_writes(ev_writer_sink(c->w), ".\n"); |
678 | return 1; |
679 | } |
680 | |
681 | static int c_volume(struct conn *c, |
682 | char **vec, |
683 | int nvec) { |
684 | int l, r, set; |
685 | char lb[32], rb[32]; |
686 | |
687 | switch(nvec) { |
688 | case 0: |
689 | set = 0; |
690 | break; |
691 | case 1: |
692 | l = r = atoi(vec[0]); |
693 | set = 1; |
694 | break; |
695 | case 2: |
696 | l = atoi(vec[0]); |
697 | r = atoi(vec[1]); |
698 | set = 1; |
699 | break; |
700 | default: |
701 | abort(); |
702 | } |
703 | if(mixer_control(&l, &r, set)) |
704 | sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n"); |
705 | else { |
706 | sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r); |
707 | if(l != volume_left || r != volume_right) { |
708 | volume_left = l; |
709 | volume_right = r; |
710 | snprintf(lb, sizeof lb, "%d", l); |
711 | snprintf(rb, sizeof rb, "%d", r); |
712 | eventlog("volume", lb, rb, (char *)0); |
713 | } |
714 | } |
715 | return 1; |
716 | } |
717 | |
718 | /* we are logging, and some data is available to read */ |
719 | static int logging_reader_callback(ev_source *ev, |
720 | ev_reader *reader, |
721 | int fd, |
722 | void *ptr, |
723 | size_t bytes, |
724 | int eof, |
725 | void *u) { |
726 | struct conn *c = u; |
727 | |
728 | /* don't log to this conn any more */ |
729 | eventlog_remove(c->lo); |
730 | /* terminate the log output */ |
731 | sink_writes(ev_writer_sink(c->w), ".\n"); |
732 | /* restore the reader callback */ |
733 | c->reader = reader_callback; |
734 | /* ...and exit via it */ |
735 | return c->reader(ev, reader, fd, ptr, bytes, eof, u); |
736 | } |
737 | |
738 | static void logclient(const char *msg, void *user) { |
739 | struct conn *c = user; |
740 | |
741 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n", |
742 | (uintmax_t)time(0), msg); |
743 | } |
744 | |
745 | static int c_log(struct conn *c, |
746 | char attribute((unused)) **vec, |
747 | int attribute((unused)) nvec) { |
748 | time_t now; |
749 | |
750 | sink_writes(ev_writer_sink(c->w), "254 OK\n"); |
751 | /* pump out initial state */ |
752 | time(&now); |
753 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
754 | (uintmax_t)now, |
755 | playing_is_enabled() ? "enable_play" : "disable_play"); |
756 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
757 | (uintmax_t)now, |
758 | random_is_enabled() ? "enable_random" : "disable_random"); |
759 | sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n", |
760 | (uintmax_t)now, |
761 | paused ? "pause" : "resume"); |
762 | c->lo = xmalloc(sizeof *c->lo); |
763 | c->lo->fn = logclient; |
764 | c->lo->user = c; |
765 | eventlog_add(c->lo); |
766 | c->reader = logging_reader_callback; |
767 | return 0; |
768 | } |
769 | |
770 | static void post_move_cleanup(void) { |
771 | struct queue_entry *q; |
772 | |
773 | /* If we have caused the random track to not be at the end then we make it no |
774 | * longer be random. */ |
775 | for(q = qhead.next; q != &qhead; q = q->next) |
776 | if(q->state == playing_random && q->next != &qhead) |
777 | q->state = playing_unplayed; |
778 | /* That might mean we need to add a new random track. */ |
779 | add_random_track(); |
780 | queue_write(); |
781 | } |
782 | |
783 | static int c_move(struct conn *c, |
784 | char **vec, |
785 | int attribute((unused)) nvec) { |
786 | struct queue_entry *q; |
787 | int n; |
788 | |
789 | if(config->restrictions & RESTRICT_MOVE) { |
790 | if(!trusted(c)) { |
791 | sink_writes(ev_writer_sink(c->w), |
792 | "550 only trusted users can move tracks\n"); |
793 | return 1; |
794 | } |
795 | } |
796 | if(!(q = queue_find(vec[0]))) { |
797 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
798 | return 1; |
799 | } |
800 | n = queue_move(q, atoi(vec[1]), c->who); |
801 | post_move_cleanup(); |
802 | sink_printf(ev_writer_sink(c->w), "252 %d\n", n); |
803 | /* If we've moved to the head of the queue then prepare the track. */ |
804 | if(q == qhead.next) |
805 | prepare(c->ev, q); |
806 | return 1; |
807 | } |
808 | |
809 | static int c_moveafter(struct conn *c, |
810 | char **vec, |
811 | int attribute((unused)) nvec) { |
812 | struct queue_entry *q, **qs; |
813 | int n; |
814 | |
815 | if(config->restrictions & RESTRICT_MOVE) { |
816 | if(!trusted(c)) { |
817 | sink_writes(ev_writer_sink(c->w), |
818 | "550 only trusted users can move tracks\n"); |
819 | return 1; |
820 | } |
821 | } |
822 | if(vec[0][0]) { |
823 | if(!(q = queue_find(vec[0]))) { |
824 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
825 | return 1; |
826 | } |
827 | } else |
828 | q = 0; |
829 | ++vec; |
830 | --nvec; |
831 | qs = xcalloc(nvec, sizeof *qs); |
832 | for(n = 0; n < nvec; ++n) |
833 | if(!(qs[n] = queue_find(vec[n]))) { |
834 | sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); |
835 | return 1; |
836 | } |
837 | queue_moveafter(q, nvec, qs, c->who); |
838 | post_move_cleanup(); |
839 | sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n"); |
840 | /* If we've moved to the head of the queue then prepare the track. */ |
841 | if(q == qhead.next) |
842 | prepare(c->ev, q); |
843 | return 1; |
844 | } |
845 | |
846 | static int c_part(struct conn *c, |
847 | char **vec, |
848 | int attribute((unused)) nvec) { |
849 | sink_printf(ev_writer_sink(c->w), "252 %s\n", |
850 | trackdb_getpart(vec[0], vec[1], vec[2])); |
851 | return 1; |
852 | } |
853 | |
854 | static int c_resolve(struct conn *c, |
855 | char **vec, |
856 | int attribute((unused)) nvec) { |
857 | const char *track; |
858 | |
859 | if(!(track = trackdb_resolve(vec[0]))) { |
860 | sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); |
861 | return 1; |
862 | } |
863 | sink_printf(ev_writer_sink(c->w), "252 %s\n", track); |
864 | return 1; |
865 | } |
866 | |
867 | static int c_tags(struct conn *c, |
868 | char attribute((unused)) **vec, |
869 | int attribute((unused)) nvec) { |
870 | char **tags = trackdb_alltags(); |
871 | |
872 | sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n"); |
873 | while(*tags) { |
874 | sink_printf(ev_writer_sink(c->w), "%s%s\n", |
875 | **tags == '.' ? "." : "", *tags); |
876 | ++tags; |
877 | } |
878 | sink_writes(ev_writer_sink(c->w), ".\n"); |
879 | return 1; /* completed */ |
880 | |
881 | } |
882 | |
883 | static int c_set_global(struct conn *c, |
884 | char **vec, |
885 | int attribute((unused)) nvec) { |
886 | trackdb_set_global(vec[0], vec[1], c->who); |
887 | sink_printf(ev_writer_sink(c->w), "250 OK\n"); |
888 | return 1; |
889 | } |
890 | |
891 | static int c_get_global(struct conn *c, |
892 | char **vec, |
893 | int attribute((unused)) nvec) { |
894 | const char *s = trackdb_get_global(vec[0]); |
895 | |
896 | if(s) |
897 | sink_printf(ev_writer_sink(c->w), "252 %s\n", s); |
898 | else |
899 | sink_writes(ev_writer_sink(c->w), "550 not found\n"); |
900 | return 1; |
901 | } |
902 | |
903 | #define C_AUTH 0001 /* must be authenticated */ |
904 | #define C_TRUSTED 0002 /* must be trusted user */ |
905 | |
906 | static const struct command { |
907 | const char *name; |
908 | int minargs, maxargs; |
909 | int (*fn)(struct conn *, char **, int); |
910 | unsigned flags; |
911 | } commands[] = { |
912 | { "allfiles", 0, 2, c_allfiles, C_AUTH }, |
913 | { "become", 1, 1, c_become, C_AUTH|C_TRUSTED }, |
914 | { "dirs", 0, 2, c_dirs, C_AUTH }, |
915 | { "disable", 0, 1, c_disable, C_AUTH }, |
916 | { "enable", 0, 0, c_enable, C_AUTH }, |
917 | { "enabled", 0, 0, c_enabled, C_AUTH }, |
918 | { "exists", 1, 1, c_exists, C_AUTH }, |
919 | { "files", 0, 2, c_files, C_AUTH }, |
920 | { "get", 2, 2, c_get, C_AUTH }, |
921 | { "get-global", 1, 1, c_get_global, C_AUTH }, |
922 | { "length", 1, 1, c_length, C_AUTH }, |
923 | { "log", 0, 0, c_log, C_AUTH }, |
924 | { "move", 2, 2, c_move, C_AUTH }, |
925 | { "moveafter", 1, INT_MAX, c_moveafter, C_AUTH }, |
926 | { "part", 3, 3, c_part, C_AUTH }, |
927 | { "pause", 0, 0, c_pause, C_AUTH }, |
928 | { "play", 1, 1, c_play, C_AUTH }, |
929 | { "playing", 0, 0, c_playing, C_AUTH }, |
930 | { "prefs", 1, 1, c_prefs, C_AUTH }, |
931 | { "queue", 0, 0, c_queue, C_AUTH }, |
932 | { "random-disable", 0, 0, c_random_disable, C_AUTH }, |
933 | { "random-enable", 0, 0, c_random_enable, C_AUTH }, |
934 | { "random-enabled", 0, 0, c_random_enabled, C_AUTH }, |
935 | { "recent", 0, 0, c_recent, C_AUTH }, |
936 | { "reconfigure", 0, 0, c_reconfigure, C_AUTH|C_TRUSTED }, |
937 | { "remove", 1, 1, c_remove, C_AUTH }, |
938 | { "rescan", 0, 0, c_rescan, C_AUTH|C_TRUSTED }, |
939 | { "resolve", 1, 1, c_resolve, C_AUTH }, |
940 | { "resume", 0, 0, c_resume, C_AUTH }, |
941 | { "scratch", 0, 1, c_scratch, C_AUTH }, |
942 | { "search", 1, 1, c_search, C_AUTH }, |
943 | { "set", 3, 3, c_set, C_AUTH, }, |
944 | { "set-global", 2, 2, c_set_global, C_AUTH }, |
945 | { "shutdown", 0, 0, c_shutdown, C_AUTH|C_TRUSTED }, |
946 | { "stats", 0, 0, c_stats, C_AUTH }, |
947 | { "tags", 0, 0, c_tags, C_AUTH }, |
948 | { "unset", 2, 2, c_set, C_AUTH }, |
949 | { "unset-global", 1, 1, c_set_global, C_AUTH }, |
950 | { "user", 2, 2, c_user, 0 }, |
951 | { "version", 0, 0, c_version, C_AUTH }, |
952 | { "volume", 0, 2, c_volume, C_AUTH } |
953 | }; |
954 | |
955 | static void command_error(const char *msg, void *u) { |
956 | struct conn *c = u; |
957 | |
958 | sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg); |
959 | } |
960 | |
961 | /* process a command. Return 1 if complete, 0 if incomplete. */ |
962 | static int command(struct conn *c, char *line) { |
963 | char **vec; |
964 | int nvec, n; |
965 | |
966 | D(("server command %s", line)); |
967 | if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) { |
968 | sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n"); |
969 | return 1; |
970 | } |
971 | if(nvec == 0) { |
972 | sink_writes(ev_writer_sink(c->w), "500 do what?\n"); |
973 | return 1; |
974 | } |
975 | if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0) |
976 | sink_writes(ev_writer_sink(c->w), "500 unknown command\n"); |
977 | else { |
978 | if((commands[n].flags & C_AUTH) && !c->who) { |
979 | sink_writes(ev_writer_sink(c->w), "530 not authenticated\n"); |
980 | return 1; |
981 | } |
982 | if((commands[n].flags & C_TRUSTED) && !trusted(c)) { |
983 | sink_writes(ev_writer_sink(c->w), "530 insufficient privilege\n"); |
984 | return 1; |
985 | } |
986 | ++vec; |
987 | --nvec; |
988 | if(nvec < commands[n].minargs) { |
989 | sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n"); |
990 | return 1; |
991 | } |
992 | if(nvec > commands[n].maxargs) { |
993 | sink_writes(ev_writer_sink(c->w), "500 too many arguments\n"); |
994 | return 1; |
995 | } |
996 | return commands[n].fn(c, vec, nvec); |
997 | } |
998 | return 1; /* completed */ |
999 | } |
1000 | |
1001 | /* redirect to the right reader callback for our current state */ |
1002 | static int redirect_reader_callback(ev_source *ev, |
1003 | ev_reader *reader, |
1004 | int fd, |
1005 | void *ptr, |
1006 | size_t bytes, |
1007 | int eof, |
1008 | void *u) { |
1009 | struct conn *c = u; |
1010 | |
1011 | return c->reader(ev, reader, fd, ptr, bytes, eof, u); |
1012 | } |
1013 | |
1014 | /* the main command reader */ |
1015 | static int reader_callback(ev_source attribute((unused)) *ev, |
1016 | ev_reader *reader, |
1017 | int attribute((unused)) fd, |
1018 | void *ptr, |
1019 | size_t bytes, |
1020 | int eof, |
1021 | void *u) { |
1022 | struct conn *c = u; |
1023 | char *eol; |
1024 | int complete; |
1025 | |
1026 | D(("server reader_callback")); |
1027 | while((eol = memchr(ptr, '\n', bytes))) { |
1028 | *eol++ = 0; |
1029 | ev_reader_consume(reader, eol - (char *)ptr); |
1030 | complete = command(c, ptr); |
1031 | bytes -= (eol - (char *)ptr); |
1032 | ptr = eol; |
1033 | if(!complete) { |
1034 | /* the command had better have set a new reader callback */ |
1035 | if(bytes || eof) |
1036 | /* there are further bytes to read, or we are at eof; arrange for the |
1037 | * command's reader callback to handle them */ |
1038 | return ev_reader_incomplete(reader); |
1039 | /* nothing's going on right now */ |
1040 | return 0; |
1041 | } |
1042 | /* command completed, we can go around and handle the next one */ |
1043 | } |
1044 | if(eof) { |
1045 | if(bytes) |
1046 | error(0, "S%x unterminated line", c->tag); |
1047 | c->r = 0; |
1048 | return ev_writer_close(c->w); |
1049 | } |
1050 | return 0; |
1051 | } |
1052 | |
1053 | static int listen_callback(ev_source *ev, |
1054 | int fd, |
1055 | const struct sockaddr attribute((unused)) *remote, |
1056 | socklen_t attribute((unused)) rlen, |
1057 | void *u) { |
1058 | const struct listener *l = u; |
1059 | struct conn *c = xmalloc(sizeof *c); |
1060 | static unsigned tags; |
1061 | |
1062 | D(("server listen_callback fd %d (%s)", fd, l->name)); |
1063 | nonblock(fd); |
1064 | cloexec(fd); |
1065 | c->tag = tags++; |
1066 | c->ev = ev; |
1067 | c->w = ev_writer_new(ev, fd, writer_error, c); |
1068 | c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c); |
1069 | c->fd = fd; |
1070 | c->reader = reader_callback; |
1071 | c->l = l; |
1072 | gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM); |
1073 | sink_printf(ev_writer_sink(c->w), "231 %s\n", hex(c->nonce, sizeof c->nonce)); |
1074 | return 0; |
1075 | } |
1076 | |
1077 | int server_start(ev_source *ev, int pf, |
1078 | size_t socklen, const struct sockaddr *sa, |
1079 | const char *name) { |
1080 | int fd; |
1081 | struct listener *l = xmalloc(sizeof *l); |
1082 | static const int one = 1; |
1083 | |
1084 | D(("server_init socket %s", name)); |
1085 | fd = xsocket(pf, SOCK_STREAM, 0); |
1086 | xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one); |
1087 | if(bind(fd, sa, socklen) < 0) { |
1088 | error(errno, "error binding to %s", name); |
1089 | return -1; |
1090 | } |
1091 | xlisten(fd, 128); |
1092 | nonblock(fd); |
1093 | cloexec(fd); |
1094 | l->name = name; |
1095 | l->pf = pf; |
1096 | if(ev_listen(ev, fd, listen_callback, l)) exit(EXIT_FAILURE); |
1097 | return fd; |
1098 | } |
1099 | |
1100 | int server_stop(ev_source *ev, int fd) { |
1101 | xclose(fd); |
1102 | return ev_listen_cancel(ev, fd); |
1103 | } |
1104 | |
1105 | /* |
1106 | Local Variables: |
1107 | c-basic-offset:2 |
1108 | comment-column:40 |
1109 | fill-column:79 |
1110 | End: |
1111 | */ |