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Sort out static content. There is a new expansion @image:NAME@ which
[disorder] / server / server.c
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460b9539 1/*
2 * This file is part of DisOrder.
768d7355 3 * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell
460b9539 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"
f08c0859 45#include "server-queue.h"
460b9539 46#include "play.h"
47#include "log.h"
48#include "mem.h"
49#include "state.h"
50#include "charset.h"
51#include "split.h"
52#include "configuration.h"
53#include "hex.h"
5df73aeb 54#include "rights.h"
460b9539 55#include "trackdb.h"
56#include "table.h"
57#include "kvp.h"
58#include "mixer.h"
59#include "sink.h"
60#include "authhash.h"
61#include "plugin.h"
62#include "printf.h"
63#include "trackname.h"
64#include "eventlog.h"
65#include "defs.h"
66#include "cache.h"
f9635e06 67#include "unicode.h"
b12be54a 68#include "cookies.h"
fce810c2 69#include "base64.h"
460b9539 70
71#ifndef NONCE_SIZE
72# define NONCE_SIZE 16
73#endif
74
10114017 75#ifndef CONFIRM_SIZE
76# define CONFIRM_SIZE 10
77#endif
78
460b9539 79int volume_left, volume_right; /* last known volume */
80
18e6d6e6 81/** @brief Accept all well-formed login attempts
82 *
83 * Used in debugging.
84 */
85int wideopen;
86
460b9539 87struct listener {
88 const char *name;
89 int pf;
90};
91
397ef7bb 92/** @brief One client connection */
460b9539 93struct conn {
397ef7bb 94 /** @brief Read commands from here */
460b9539 95 ev_reader *r;
397ef7bb 96 /** @brief Send responses to here */
460b9539 97 ev_writer *w;
397ef7bb 98 /** @brief Underlying file descriptor */
460b9539 99 int fd;
397ef7bb 100 /** @brief Unique identifier for connection used in log messages */
460b9539 101 unsigned tag;
397ef7bb 102 /** @brief Login name or NULL */
460b9539 103 char *who;
397ef7bb 104 /** @brief Event loop */
460b9539 105 ev_source *ev;
397ef7bb 106 /** @brief Nonce chosen for this connection */
460b9539 107 unsigned char nonce[NONCE_SIZE];
397ef7bb
RK
108 /** @brief Current reader callback
109 *
110 * We change this depending on whether we're servicing the @b log command
111 */
460b9539 112 ev_reader_callback *reader;
397ef7bb 113 /** @brief Event log output sending to this connection */
460b9539 114 struct eventlog_output *lo;
397ef7bb 115 /** @brief Parent listener */
460b9539 116 const struct listener *l;
b12be54a
RK
117 /** @brief Login cookie or NULL */
118 char *cookie;
eb5dc014
RK
119 /** @brief Connection rights */
120 rights_type rights;
0126692c 121 /** @brief Next connection */
122 struct conn *next;
460b9539 123};
124
0126692c 125/** @brief Linked list of connections */
126static struct conn *connections;
127
460b9539 128static int reader_callback(ev_source *ev,
129 ev_reader *reader,
460b9539 130 void *ptr,
131 size_t bytes,
132 int eof,
133 void *u);
134
135static const char *noyes[] = { "no", "yes" };
136
0126692c 137/** @brief Remove a connection from the connection list */
138static void remove_connection(struct conn *c) {
139 struct conn **cc;
140
141 for(cc = &connections; *cc && *cc != c; cc = &(*cc)->next)
142 ;
143 if(*cc)
144 *cc = c->next;
145}
146
397ef7bb
RK
147/** @brief Called when a connection's writer fails or is shut down
148 *
149 * If the connection still has a raeder that is cancelled.
150 */
460b9539 151static int writer_error(ev_source attribute((unused)) *ev,
460b9539 152 int errno_value,
153 void *u) {
154 struct conn *c = u;
155
8d8b8c1f 156 D(("server writer_error S%x %d", c->tag, errno_value));
460b9539 157 if(errno_value == 0) {
158 /* writer is done */
8d8b8c1f 159 D(("S%x writer completed", c->tag));
460b9539 160 } else {
161 if(errno_value != EPIPE)
162 error(errno_value, "S%x write error on socket", c->tag);
38b8221f 163 if(c->r) {
8d8b8c1f 164 D(("cancel reader"));
38b8221f
RK
165 ev_reader_cancel(c->r);
166 c->r = 0;
167 }
8d8b8c1f 168 D(("done cancel reader"));
460b9539 169 }
38b8221f 170 c->w = 0;
75d64210 171 ev_report(ev);
0126692c 172 remove_connection(c);
460b9539 173 return 0;
174}
175
397ef7bb
RK
176/** @brief Called when a conncetion's reader fails or is shut down
177 *
178 * If connection still has a writer then it is closed.
179 */
460b9539 180static int reader_error(ev_source attribute((unused)) *ev,
460b9539 181 int errno_value,
182 void *u) {
183 struct conn *c = u;
184
8d8b8c1f 185 D(("server reader_error S%x %d", c->tag, errno_value));
1563f6f6 186 error(errno_value, "S%x read error on socket", c->tag);
38b8221f
RK
187 if(c->w)
188 ev_writer_close(c->w);
189 c->w = 0;
190 c->r = 0;
768d7355 191 ev_report(ev);
0126692c 192 remove_connection(c);
460b9539 193 return 0;
194}
195
460b9539 196static int c_disable(struct conn *c, char **vec, int nvec) {
197 if(nvec == 0)
198 disable_playing(c->who);
199 else if(nvec == 1 && !strcmp(vec[0], "now"))
200 disable_playing(c->who);
201 else {
202 sink_writes(ev_writer_sink(c->w), "550 invalid argument\n");
203 return 1; /* completed */
204 }
205 sink_writes(ev_writer_sink(c->w), "250 OK\n");
206 return 1; /* completed */
207}
208
209static int c_enable(struct conn *c,
210 char attribute((unused)) **vec,
211 int attribute((unused)) nvec) {
212 enable_playing(c->who, c->ev);
213 /* Enable implicitly unpauses if there is nothing playing */
214 if(paused && !playing) resume_playing(c->who);
215 sink_writes(ev_writer_sink(c->w), "250 OK\n");
216 return 1; /* completed */
217}
218
219static int c_enabled(struct conn *c,
220 char attribute((unused)) **vec,
221 int attribute((unused)) nvec) {
222 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]);
223 return 1; /* completed */
224}
225
226static int c_play(struct conn *c, char **vec,
227 int attribute((unused)) nvec) {
228 const char *track;
229 struct queue_entry *q;
230
231 if(!trackdb_exists(vec[0])) {
232 sink_writes(ev_writer_sink(c->w), "550 track is not in database\n");
233 return 1;
234 }
235 if(!(track = trackdb_resolve(vec[0]))) {
236 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
237 return 1;
238 }
239 q = queue_add(track, c->who, WHERE_BEFORE_RANDOM);
240 queue_write();
241 /* If we added the first track, and something is playing, then prepare the
242 * new track. If nothing is playing then we don't bother as it wouldn't gain
243 * anything. */
244 if(q == qhead.next && playing)
245 prepare(c->ev, q);
81e440ce 246 sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id);
460b9539 247 /* If the queue was empty but we are for some reason paused then
248 * unpause. */
249 if(!playing) resume_playing(0);
250 play(c->ev);
251 return 1; /* completed */
252}
253
254static int c_remove(struct conn *c, char **vec,
255 int attribute((unused)) nvec) {
256 struct queue_entry *q;
257
258 if(!(q = queue_find(vec[0]))) {
259 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
260 return 1;
261 }
938d8157 262 if(!right_removable(c->rights, c->who, q)) {
834e7c4a 263 error(0, "%s attempted remove but lacks required rights", c->who);
eb5dc014 264 sink_writes(ev_writer_sink(c->w),
b4a80f69 265 "510 Not authorized to remove that track\n");
eb5dc014 266 return 1;
460b9539 267 }
268 queue_remove(q, c->who);
269 /* De-prepare the track. */
270 abandon(c->ev, q);
eb5dc014 271 /* If we removed a random track then add another one. */
460b9539 272 if(q->state == playing_random)
273 add_random_track();
274 /* Prepare whatever the next head track is. */
275 if(qhead.next != &qhead)
276 prepare(c->ev, qhead.next);
277 queue_write();
278 sink_writes(ev_writer_sink(c->w), "250 removed\n");
279 return 1; /* completed */
280}
281
282static int c_scratch(struct conn *c,
283 char **vec,
284 int nvec) {
285 if(!playing) {
286 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
287 return 1; /* completed */
288 }
eb5dc014
RK
289 /* TODO there is a bug here: if we specify an ID but it's not the currently
290 * playing track then you will get 550 if you weren't authorized to scratch
291 * the currently playing track. */
938d8157 292 if(!right_scratchable(c->rights, c->who, playing)) {
834e7c4a 293 error(0, "%s attempted scratch but lacks required rights", c->who);
eb5dc014 294 sink_writes(ev_writer_sink(c->w),
b4a80f69 295 "510 Not authorized to scratch that track\n");
eb5dc014 296 return 1;
460b9539 297 }
298 scratch(c->who, nvec == 1 ? vec[0] : 0);
299 /* If you scratch an unpaused track then it is automatically unpaused */
300 resume_playing(0);
301 sink_writes(ev_writer_sink(c->w), "250 scratched\n");
302 return 1; /* completed */
303}
304
305static int c_pause(struct conn *c,
306 char attribute((unused)) **vec,
307 int attribute((unused)) nvec) {
308 if(!playing) {
309 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
310 return 1; /* completed */
311 }
312 if(paused) {
313 sink_writes(ev_writer_sink(c->w), "250 already paused\n");
314 return 1; /* completed */
315 }
316 if(pause_playing(c->who) < 0)
317 sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n");
318 else
319 sink_writes(ev_writer_sink(c->w), "250 paused\n");
320 return 1;
321}
322
323static int c_resume(struct conn *c,
324 char attribute((unused)) **vec,
325 int attribute((unused)) nvec) {
326 if(!paused) {
327 sink_writes(ev_writer_sink(c->w), "250 not paused\n");
328 return 1; /* completed */
329 }
330 resume_playing(c->who);
331 sink_writes(ev_writer_sink(c->w), "250 paused\n");
332 return 1;
333}
334
335static int c_shutdown(struct conn *c,
336 char attribute((unused)) **vec,
337 int attribute((unused)) nvec) {
338 info("S%x shut down by %s", c->tag, c->who);
339 sink_writes(ev_writer_sink(c->w), "250 shutting down\n");
340 ev_writer_flush(c->w);
341 quit(c->ev);
342}
343
344static int c_reconfigure(struct conn *c,
345 char attribute((unused)) **vec,
346 int attribute((unused)) nvec) {
347 info("S%x reconfigure by %s", c->tag, c->who);
348 if(reconfigure(c->ev, 1))
349 sink_writes(ev_writer_sink(c->w), "550 error reading new config\n");
350 else
351 sink_writes(ev_writer_sink(c->w), "250 installed new config\n");
352 return 1; /* completed */
353}
354
355static int c_rescan(struct conn *c,
356 char attribute((unused)) **vec,
357 int attribute((unused)) nvec) {
358 info("S%x rescan by %s", c->tag, c->who);
ffac51d7 359 trackdb_rescan(c->ev, 1/*check*/);
460b9539 360 sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n");
361 return 1; /* completed */
362}
363
364static int c_version(struct conn *c,
365 char attribute((unused)) **vec,
366 int attribute((unused)) nvec) {
367 /* VERSION had better only use the basic character set */
a05e4467 368 sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string);
460b9539 369 return 1; /* completed */
370}
371
372static int c_playing(struct conn *c,
373 char attribute((unused)) **vec,
374 int attribute((unused)) nvec) {
375 if(playing) {
376 queue_fix_sofar(playing);
377 playing->expected = 0;
378 sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing));
379 } else
380 sink_printf(ev_writer_sink(c->w), "259 nothing playing\n");
381 return 1; /* completed */
382}
383
b12be54a 384static const char *connection_host(struct conn *c) {
460b9539 385 union {
386 struct sockaddr sa;
387 struct sockaddr_in in;
388 struct sockaddr_in6 in6;
389 } u;
390 socklen_t l;
b12be54a 391 int n;
460b9539 392 char host[1024];
393
460b9539 394 /* get connection data */
395 l = sizeof u;
396 if(getpeername(c->fd, &u.sa, &l) < 0) {
397 error(errno, "S%x error calling getpeername", c->tag);
b12be54a 398 return 0;
460b9539 399 }
400 if(c->l->pf != PF_UNIX) {
401 if((n = getnameinfo(&u.sa, l,
402 host, sizeof host, 0, 0, NI_NUMERICHOST))) {
403 error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n));
b12be54a 404 return 0;
460b9539 405 }
b12be54a 406 return xstrdup(host);
18e6d6e6 407 } else
b12be54a
RK
408 return "local";
409}
410
411static int c_user(struct conn *c,
412 char **vec,
413 int attribute((unused)) nvec) {
eb5dc014 414 struct kvp *k;
f0feb22e 415 const char *res, *host, *password;
eb5dc014 416 rights_type rights;
b12be54a
RK
417
418 if(c->who) {
419 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
420 return 1;
421 }
422 /* get connection data */
423 if(!(host = connection_host(c))) {
424 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
425 return 1;
426 }
460b9539 427 /* find the user */
eb5dc014 428 k = trackdb_getuserinfo(vec[0]);
f0feb22e 429 /* reject nonexistent users */
eb5dc014
RK
430 if(!k) {
431 error(0, "S%x unknown user '%s' from %s", c->tag, vec[0], host);
432 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
433 return 1;
434 }
435 /* reject unconfirmed users */
436 if(kvp_get(k, "confirmation")) {
437 error(0, "S%x unconfirmed user '%s' from %s", c->tag, vec[0], host);
438 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
439 return 1;
440 }
441 password = kvp_get(k, "password");
442 if(!password) password = "";
0f55e905 443 if(parse_rights(kvp_get(k, "rights"), &rights, 1)) {
eb5dc014 444 error(0, "error parsing rights for %s", vec[0]);
18e6d6e6 445 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
446 return 1;
447 }
f0feb22e
RK
448 /* check whether the response is right */
449 res = authhash(c->nonce, sizeof c->nonce, password,
637fdea3 450 config->authorization_algorithm);
18e6d6e6 451 if(wideopen || (res && !strcmp(res, vec[1]))) {
452 c->who = vec[0];
eb5dc014 453 c->rights = rights;
18e6d6e6 454 /* currently we only bother logging remote connections */
30365519 455 if(strcmp(host, "local"))
18e6d6e6 456 info("S%x %s connected from %s", c->tag, vec[0], host);
30365519 457 else
eb5dc014 458 c->rights |= RIGHT__LOCAL;
18e6d6e6 459 sink_writes(ev_writer_sink(c->w), "230 OK\n");
460 return 1;
460b9539 461 }
462 /* oops, response was wrong */
18e6d6e6 463 info("S%x authentication failure for %s from %s", c->tag, vec[0], host);
460b9539 464 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
465 return 1;
466}
467
468static int c_recent(struct conn *c,
469 char attribute((unused)) **vec,
470 int attribute((unused)) nvec) {
471 const struct queue_entry *q;
472
473 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
474 for(q = phead.next; q != &phead; q = q->next)
475 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
476 sink_writes(ev_writer_sink(c->w), ".\n");
477 return 1; /* completed */
478}
479
480static int c_queue(struct conn *c,
481 char attribute((unused)) **vec,
482 int attribute((unused)) nvec) {
483 struct queue_entry *q;
484 time_t when = 0;
485 const char *l;
486 long length;
487
488 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
489 if(playing_is_enabled() && !paused) {
490 if(playing) {
491 queue_fix_sofar(playing);
492 if((l = trackdb_get(playing->track, "_length"))
493 && (length = atol(l))) {
494 time(&when);
495 when += length - playing->sofar + config->gap;
496 }
497 } else
498 /* Nothing is playing but playing is enabled, so whatever is
499 * first in the queue can be expected to start immediately. */
500 time(&when);
501 }
502 for(q = qhead.next; q != &qhead; q = q->next) {
503 /* fill in estimated start time */
504 q->expected = when;
505 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
506 /* update for next track */
507 if(when) {
508 if((l = trackdb_get(q->track, "_length"))
509 && (length = atol(l)))
510 when += length + config->gap;
511 else
512 when = 0;
513 }
514 }
515 sink_writes(ev_writer_sink(c->w), ".\n");
516 return 1; /* completed */
517}
518
519static int output_list(struct conn *c, char **vec) {
520 while(*vec)
521 sink_printf(ev_writer_sink(c->w), "%s\n", *vec++);
522 sink_writes(ev_writer_sink(c->w), ".\n");
523 return 1;
524}
525
526static int files_dirs(struct conn *c,
527 char **vec,
528 int nvec,
529 enum trackdb_listable what) {
530 const char *dir, *re, *errstr;
531 int erroffset;
532 pcre *rec;
533 char **fvec, *key;
534
535 switch(nvec) {
536 case 0: dir = 0; re = 0; break;
537 case 1: dir = vec[0]; re = 0; break;
538 case 2: dir = vec[0]; re = vec[1]; break;
539 default: abort();
540 }
541 /* A bit of a bodge to make sure the args don't trample on cache keys */
542 if(dir && strchr(dir, '\n')) {
543 sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n");
544 return 1;
545 }
546 if(re && strchr(re, '\n')) {
547 sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n");
548 return 1;
549 }
550 /* We bother eliminating "" because the web interface is relatively
551 * likely to send it */
552 if(re && *re) {
553 byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re);
554 fvec = (char **)cache_get(&cache_files_type, key);
555 if(fvec) {
556 /* Got a cache hit, don't store the answer in the cache */
557 key = 0;
558 ++cache_files_hits;
559 rec = 0; /* quieten compiler */
560 } else {
561 /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer
562 * in the cache. */
563 if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8,
564 &errstr, &erroffset, 0))) {
565 sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n",
566 errstr);
567 return 1;
568 }
569 /* It only counts as a miss if the regexp was valid. */
570 ++cache_files_misses;
571 }
572 } else {
573 /* No regexp, don't bother caching the result */
574 rec = 0;
575 key = 0;
576 fvec = 0;
577 }
578 if(!fvec) {
579 /* No cache hit (either because a miss, or because we did not look) so do
580 * the lookup */
581 if(dir && *dir)
582 fvec = trackdb_list(dir, 0, what, rec);
583 else
584 fvec = trackdb_list(0, 0, what, rec);
585 }
586 if(key)
587 /* Put the answer in the cache */
588 cache_put(&cache_files_type, key, fvec);
589 sink_writes(ev_writer_sink(c->w), "253 Listing follow\n");
590 return output_list(c, fvec);
591}
592
593static int c_files(struct conn *c,
594 char **vec,
595 int nvec) {
596 return files_dirs(c, vec, nvec, trackdb_files);
597}
598
599static int c_dirs(struct conn *c,
600 char **vec,
601 int nvec) {
602 return files_dirs(c, vec, nvec, trackdb_directories);
603}
604
605static int c_allfiles(struct conn *c,
606 char **vec,
607 int nvec) {
608 return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files);
609}
610
611static int c_get(struct conn *c,
612 char **vec,
613 int attribute((unused)) nvec) {
614 const char *v;
615
616 if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1])))
7b32e917 617 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 618 else
fb1bc1f5 619 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 620 return 1;
621}
622
623static int c_length(struct conn *c,
624 char **vec,
625 int attribute((unused)) nvec) {
626 const char *track, *v;
627
628 if(!(track = trackdb_resolve(vec[0]))) {
629 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
630 return 1;
631 }
632 if((v = trackdb_get(track, "_length")))
7b32e917 633 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 634 else
635 sink_writes(ev_writer_sink(c->w), "550 not found\n");
636 return 1;
637}
638
639static int c_set(struct conn *c,
640 char **vec,
641 int attribute((unused)) nvec) {
642 if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2]))
643 sink_writes(ev_writer_sink(c->w), "250 OK\n");
644 else
645 sink_writes(ev_writer_sink(c->w), "550 not found\n");
646 return 1;
647}
648
649static int c_prefs(struct conn *c,
650 char **vec,
651 int attribute((unused)) nvec) {
652 struct kvp *k;
653
654 k = trackdb_get_all(vec[0]);
655 sink_writes(ev_writer_sink(c->w), "253 prefs follow\n");
656 for(; k; k = k->next)
657 if(k->name[0] != '_') /* omit internal values */
658 sink_printf(ev_writer_sink(c->w),
659 " %s %s\n", quoteutf8(k->name), quoteutf8(k->value));
660 sink_writes(ev_writer_sink(c->w), ".\n");
661 return 1;
662}
663
664static int c_exists(struct conn *c,
665 char **vec,
666 int attribute((unused)) nvec) {
667 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]);
668 return 1;
669}
670
671static void search_parse_error(const char *msg, void *u) {
672 *(const char **)u = msg;
673}
674
675static int c_search(struct conn *c,
676 char **vec,
677 int attribute((unused)) nvec) {
678 char **terms, **results;
679 int nterms, nresults, n;
680 const char *e = "unknown error";
681
682 /* This is a bit of a bodge. Initially it's there to make the eclient
683 * interface a bit more convenient to add searching to, but it has the more
684 * compelling advantage that if everything uses it, then interpretation of
685 * user-supplied search strings will be the same everywhere. */
686 if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) {
687 sink_printf(ev_writer_sink(c->w), "550 %s\n", e);
688 } else {
689 results = trackdb_search(terms, nterms, &nresults);
690 sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults);
691 for(n = 0; n < nresults; ++n)
692 sink_printf(ev_writer_sink(c->w), "%s\n", results[n]);
693 sink_writes(ev_writer_sink(c->w), ".\n");
694 }
695 return 1;
696}
697
698static int c_random_enable(struct conn *c,
699 char attribute((unused)) **vec,
700 int attribute((unused)) nvec) {
701 enable_random(c->who, c->ev);
702 /* Enable implicitly unpauses if there is nothing playing */
703 if(paused && !playing) resume_playing(c->who);
704 sink_writes(ev_writer_sink(c->w), "250 OK\n");
705 return 1; /* completed */
706}
707
708static int c_random_disable(struct conn *c,
709 char attribute((unused)) **vec,
710 int attribute((unused)) nvec) {
711 disable_random(c->who);
712 sink_writes(ev_writer_sink(c->w), "250 OK\n");
713 return 1; /* completed */
714}
715
716static int c_random_enabled(struct conn *c,
717 char attribute((unused)) **vec,
718 int attribute((unused)) nvec) {
719 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]);
720 return 1; /* completed */
721}
722
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723static void got_stats(char *stats, void *u) {
724 struct conn *const c = u;
725
726 sink_printf(ev_writer_sink(c->w), "253 stats\n%s\n.\n", stats);
727 /* Now we can start processing commands again */
728 ev_reader_enable(c->r);
729}
730
460b9539 731static int c_stats(struct conn *c,
732 char attribute((unused)) **vec,
733 int attribute((unused)) nvec) {
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RK
734 trackdb_stats_subprocess(c->ev, got_stats, c);
735 return 0; /* not yet complete */
460b9539 736}
737
738static int c_volume(struct conn *c,
739 char **vec,
740 int nvec) {
741 int l, r, set;
742 char lb[32], rb[32];
eb5dc014 743 rights_type rights;
460b9539 744
745 switch(nvec) {
746 case 0:
747 set = 0;
748 break;
749 case 1:
750 l = r = atoi(vec[0]);
751 set = 1;
752 break;
753 case 2:
754 l = atoi(vec[0]);
755 r = atoi(vec[1]);
756 set = 1;
757 break;
758 default:
759 abort();
760 }
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761 rights = set ? RIGHT_VOLUME : RIGHT_READ;
762 if(!(c->rights & rights)) {
834e7c4a 763 error(0, "%s attempted to set volume but lacks required rights", c->who);
b4a80f69 764 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
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765 return 1;
766 }
460b9539 767 if(mixer_control(&l, &r, set))
768 sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n");
769 else {
770 sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r);
771 if(l != volume_left || r != volume_right) {
772 volume_left = l;
773 volume_right = r;
774 snprintf(lb, sizeof lb, "%d", l);
775 snprintf(rb, sizeof rb, "%d", r);
776 eventlog("volume", lb, rb, (char *)0);
777 }
778 }
779 return 1;
780}
781
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782/** @brief Called when data arrives on a log connection
783 *
784 * We just discard all such data. The client may occasionally send data as a
785 * keepalive.
786 */
787static int logging_reader_callback(ev_source attribute((unused)) *ev,
460b9539 788 ev_reader *reader,
397ef7bb 789 void attribute((unused)) *ptr,
460b9539 790 size_t bytes,
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791 int attribute((unused)) eof,
792 void attribute((unused)) *u) {
460b9539 793 struct conn *c = u;
794
397ef7bb
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795 ev_reader_consume(reader, bytes);
796 if(eof) {
797 /* Oops, that's all for now */
8d8b8c1f 798 D(("logging reader eof"));
397ef7bb 799 if(c->w) {
8d8b8c1f 800 D(("close writer"));
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801 ev_writer_close(c->w);
802 c->w = 0;
803 }
804 c->r = 0;
0126692c 805 remove_connection(c);
f6033c46 806 }
397ef7bb 807 return 0;
460b9539 808}
809
810static void logclient(const char *msg, void *user) {
811 struct conn *c = user;
812
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813 if(!c->w || !c->r) {
814 /* This connection has gone up in smoke for some reason */
815 eventlog_remove(c->lo);
816 return;
817 }
460b9539 818 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n",
819 (uintmax_t)time(0), msg);
820}
821
822static int c_log(struct conn *c,
823 char attribute((unused)) **vec,
824 int attribute((unused)) nvec) {
825 time_t now;
826
827 sink_writes(ev_writer_sink(c->w), "254 OK\n");
828 /* pump out initial state */
829 time(&now);
830 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
831 (uintmax_t)now,
832 playing_is_enabled() ? "enable_play" : "disable_play");
833 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
834 (uintmax_t)now,
835 random_is_enabled() ? "enable_random" : "disable_random");
836 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
837 (uintmax_t)now,
838 paused ? "pause" : "resume");
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839 if(playing)
840 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state playing\n",
841 (uintmax_t)now);
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RK
842 /* Initial volume */
843 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" volume %d %d\n",
844 (uintmax_t)now, volume_left, volume_right);
460b9539 845 c->lo = xmalloc(sizeof *c->lo);
846 c->lo->fn = logclient;
847 c->lo->user = c;
848 eventlog_add(c->lo);
849 c->reader = logging_reader_callback;
850 return 0;
851}
852
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853/** @brief Test whether a move is allowed
854 * @param c Connection
855 * @param qs List of IDs on queue
856 * @param nqs Number of IDs
857 * @return 0 if move is prohibited, non-0 if it is allowed
858 */
859static int has_move_rights(struct conn *c, struct queue_entry **qs, int nqs) {
eb5dc014
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860 for(; nqs > 0; ++qs, --nqs) {
861 struct queue_entry *const q = *qs;
862
938d8157 863 if(!right_movable(c->rights, c->who, q))
864 return 0;
eb5dc014 865 }
938d8157 866 return 1;
eb5dc014
RK
867}
868
460b9539 869static int c_move(struct conn *c,
870 char **vec,
871 int attribute((unused)) nvec) {
872 struct queue_entry *q;
873 int n;
874
460b9539 875 if(!(q = queue_find(vec[0]))) {
876 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
877 return 1;
878 }
eb5dc014 879 if(!has_move_rights(c, &q, 1)) {
834e7c4a 880 error(0, "%s attempted move but lacks required rights", c->who);
eb5dc014 881 sink_writes(ev_writer_sink(c->w),
b4a80f69 882 "510 Not authorized to move that track\n");
eb5dc014
RK
883 return 1;
884 }
460b9539 885 n = queue_move(q, atoi(vec[1]), c->who);
460b9539 886 sink_printf(ev_writer_sink(c->w), "252 %d\n", n);
887 /* If we've moved to the head of the queue then prepare the track. */
888 if(q == qhead.next)
889 prepare(c->ev, q);
890 return 1;
891}
892
893static int c_moveafter(struct conn *c,
894 char **vec,
895 int attribute((unused)) nvec) {
896 struct queue_entry *q, **qs;
897 int n;
898
460b9539 899 if(vec[0][0]) {
900 if(!(q = queue_find(vec[0]))) {
901 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
902 return 1;
903 }
904 } else
905 q = 0;
906 ++vec;
907 --nvec;
908 qs = xcalloc(nvec, sizeof *qs);
909 for(n = 0; n < nvec; ++n)
910 if(!(qs[n] = queue_find(vec[n]))) {
911 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
912 return 1;
913 }
eb5dc014 914 if(!has_move_rights(c, qs, nvec)) {
834e7c4a 915 error(0, "%s attempted moveafter but lacks required rights", c->who);
eb5dc014 916 sink_writes(ev_writer_sink(c->w),
b4a80f69 917 "510 Not authorized to move those tracks\n");
eb5dc014
RK
918 return 1;
919 }
460b9539 920 queue_moveafter(q, nvec, qs, c->who);
460b9539 921 sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n");
922 /* If we've moved to the head of the queue then prepare the track. */
923 if(q == qhead.next)
924 prepare(c->ev, q);
925 return 1;
926}
927
928static int c_part(struct conn *c,
929 char **vec,
930 int attribute((unused)) nvec) {
931 sink_printf(ev_writer_sink(c->w), "252 %s\n",
7b32e917 932 quoteutf8(trackdb_getpart(vec[0], vec[1], vec[2])));
460b9539 933 return 1;
934}
935
936static int c_resolve(struct conn *c,
937 char **vec,
938 int attribute((unused)) nvec) {
939 const char *track;
940
941 if(!(track = trackdb_resolve(vec[0]))) {
942 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
943 return 1;
944 }
7b32e917 945 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(track));
460b9539 946 return 1;
947}
948
949static int c_tags(struct conn *c,
950 char attribute((unused)) **vec,
951 int attribute((unused)) nvec) {
952 char **tags = trackdb_alltags();
953
954 sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n");
955 while(*tags) {
956 sink_printf(ev_writer_sink(c->w), "%s%s\n",
957 **tags == '.' ? "." : "", *tags);
958 ++tags;
959 }
960 sink_writes(ev_writer_sink(c->w), ".\n");
961 return 1; /* completed */
460b9539 962}
963
964static int c_set_global(struct conn *c,
965 char **vec,
966 int attribute((unused)) nvec) {
f9635e06
RK
967 if(vec[0][0] == '_') {
968 sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n");
969 return 1;
970 }
460b9539 971 trackdb_set_global(vec[0], vec[1], c->who);
972 sink_printf(ev_writer_sink(c->w), "250 OK\n");
973 return 1;
974}
975
976static int c_get_global(struct conn *c,
977 char **vec,
978 int attribute((unused)) nvec) {
979 const char *s = trackdb_get_global(vec[0]);
980
981 if(s)
7b32e917 982 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(s));
460b9539 983 else
fb1bc1f5 984 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 985 return 1;
986}
987
7858930d 988static int c_nop(struct conn *c,
989 char attribute((unused)) **vec,
990 int attribute((unused)) nvec) {
991 sink_printf(ev_writer_sink(c->w), "250 Quack\n");
992 return 1;
993}
994
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995static int c_new(struct conn *c,
996 char **vec,
997 int nvec) {
998 char **tracks = trackdb_new(0, nvec > 0 ? atoi(vec[0]) : INT_MAX);
999
1000 sink_printf(ev_writer_sink(c->w), "253 New track list follows\n");
1001 while(*tracks) {
1002 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1003 **tracks == '.' ? "." : "", *tracks);
1004 ++tracks;
1005 }
1006 sink_writes(ev_writer_sink(c->w), ".\n");
1007 return 1; /* completed */
1008
1009}
1010
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RK
1011static int c_rtp_address(struct conn *c,
1012 char attribute((unused)) **vec,
1013 int attribute((unused)) nvec) {
bd8895a8 1014 if(config->api == BACKEND_NETWORK) {
ca831831
RK
1015 sink_printf(ev_writer_sink(c->w), "252 %s %s\n",
1016 quoteutf8(config->broadcast.s[0]),
1017 quoteutf8(config->broadcast.s[1]));
1018 } else
1019 sink_writes(ev_writer_sink(c->w), "550 No RTP\n");
1020 return 1;
1021}
b12be54a
RK
1022
1023static int c_cookie(struct conn *c,
1024 char **vec,
1025 int attribute((unused)) nvec) {
1026 const char *host;
1027 char *user;
eb5dc014 1028 rights_type rights;
b12be54a
RK
1029
1030 /* Can't log in twice on the same connection */
1031 if(c->who) {
1032 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
1033 return 1;
1034 }
1035 /* Get some kind of peer identifcation */
1036 if(!(host = connection_host(c))) {
1037 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1038 return 1;
1039 }
1040 /* Check the cookie */
eb5dc014 1041 user = verify_cookie(vec[0], &rights);
b12be54a
RK
1042 if(!user) {
1043 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1044 return 1;
1045 }
1046 /* Log in */
e48c28bb 1047 c->who = user;
b12be54a 1048 c->cookie = vec[0];
eb5dc014 1049 c->rights = rights;
30365519 1050 if(strcmp(host, "local"))
b12be54a 1051 info("S%x %s connected with cookie from %s", c->tag, user, host);
30365519 1052 else
eb5dc014 1053 c->rights |= RIGHT__LOCAL;
0227f67d
RK
1054 /* Response contains username so client knows who they are acting as */
1055 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
b12be54a
RK
1056 return 1;
1057}
1058
1059static int c_make_cookie(struct conn *c,
1060 char attribute((unused)) **vec,
1061 int attribute((unused)) nvec) {
1062 const char *cookie = make_cookie(c->who);
1063
1064 if(cookie)
eb5dc014 1065 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cookie));
b12be54a
RK
1066 else
1067 sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n");
1068 return 1;
1069}
1070
1071static int c_revoke(struct conn *c,
1072 char attribute((unused)) **vec,
1073 int attribute((unused)) nvec) {
1074 if(c->cookie) {
1075 revoke_cookie(c->cookie);
1076 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1077 } else
1078 sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n");
1079 return 1;
1080}
1081
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RK
1082static int c_adduser(struct conn *c,
1083 char **vec,
0f55e905
RK
1084 int nvec) {
1085 const char *rights;
1086
1087 if(nvec > 2) {
1088 rights = vec[2];
1089 if(parse_rights(vec[2], 0, 1)) {
1090 sink_writes(ev_writer_sink(c->w), "550 Invalid rights list\n");
1091 return -1;
1092 }
1093 } else
1094 rights = config->default_rights;
1095 if(trackdb_adduser(vec[0], vec[1], rights,
ba39faf6 1096 0/*email*/, 0/*confirmation*/))
f0feb22e
RK
1097 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1098 else
1099 sink_writes(ev_writer_sink(c->w), "250 User created\n");
1100 return 1;
1101}
1102
1103static int c_deluser(struct conn *c,
1104 char **vec,
1105 int attribute((unused)) nvec) {
0126692c 1106 struct conn *d;
1107
1108 if(trackdb_deluser(vec[0])) {
ba39faf6 1109 sink_writes(ev_writer_sink(c->w), "550 Cannot delete user\n");
0126692c 1110 return 1;
1111 }
1112 /* Zap connections belonging to deleted user */
1113 for(d = connections; d; d = d->next)
1114 if(!strcmp(d->who, vec[0]))
1115 d->rights = 0;
1116 sink_writes(ev_writer_sink(c->w), "250 User deleted\n");
f0feb22e
RK
1117 return 1;
1118}
1119
1120static int c_edituser(struct conn *c,
5df73aeb 1121 char **vec,
f0feb22e 1122 int attribute((unused)) nvec) {
0126692c 1123 struct conn *d;
1124
eb5dc014
RK
1125 /* RIGHT_ADMIN can do anything; otherwise you can only set your own email
1126 * address and password. */
1127 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1128 || (!strcmp(c->who, vec[0])
1129 && (!strcmp(vec[1], "email")
1130 || !strcmp(vec[1], "password")))) {
0126692c 1131 if(trackdb_edituserinfo(vec[0], vec[1], vec[2])) {
5df73aeb 1132 sink_writes(ev_writer_sink(c->w), "550 Failed to change setting\n");
0126692c 1133 return 1;
1134 }
1135 if(!strcmp(vec[1], "password")) {
1136 /* Zap all connections for this user after a password change */
1137 for(d = connections; d; d = d->next)
1138 if(!strcmp(d->who, vec[0]))
1139 d->rights = 0;
1140 } else if(!strcmp(vec[1], "rights")) {
1141 /* Update rights for this user */
1142 rights_type r;
1143
1144 if(parse_rights(vec[1], &r, 1))
1145 for(d = connections; d; d = d->next)
1146 if(!strcmp(d->who, vec[0]))
1147 d->rights = r;
1148 }
1149 sink_writes(ev_writer_sink(c->w), "250 OK\n");
834e7c4a 1150 } else {
1151 error(0, "%s attempted edituser but lacks required rights", c->who);
b4a80f69 1152 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
834e7c4a 1153 }
f0feb22e
RK
1154 return 1;
1155}
1156
1157static int c_userinfo(struct conn *c,
1158 char attribute((unused)) **vec,
1159 int attribute((unused)) nvec) {
5df73aeb
RK
1160 struct kvp *k;
1161 const char *value;
eb5dc014
RK
1162
1163 /* RIGHT_ADMIN allows anything; otherwise you can only get your own email
1164 * address and righst list. */
1165 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1166 || (!strcmp(c->who, vec[0])
1167 && (!strcmp(vec[1], "email")
1168 || !strcmp(vec[1], "rights")))) {
1169 if((k = trackdb_getuserinfo(vec[0])))
1170 if((value = kvp_get(k, vec[1])))
1171 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(value));
1172 else
1173 sink_writes(ev_writer_sink(c->w), "555 Not set\n");
1174 else
1175 sink_writes(ev_writer_sink(c->w), "550 No such user\n");
834e7c4a 1176 } else {
1177 error(0, "%s attempted userinfo but lacks required rights", c->who);
b4a80f69 1178 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
834e7c4a 1179 }
f0feb22e
RK
1180 return 1;
1181}
1182
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RK
1183static int c_users(struct conn *c,
1184 char attribute((unused)) **vec,
1185 int attribute((unused)) nvec) {
1186 /* TODO de-dupe with c_tags */
1187 char **users = trackdb_listusers();
1188
1189 sink_writes(ev_writer_sink(c->w), "253 User list follows\n");
1190 while(*users) {
1191 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1192 **users == '.' ? "." : "", *users);
1193 ++users;
1194 }
1195 sink_writes(ev_writer_sink(c->w), ".\n");
1196 return 1; /* completed */
1197}
1198
86e3aea7 1199/** @brief Base64 mapping table for confirmation strings
1200 *
1201 * This is used with generic_to_base64() and generic_base64(). We cannot use
1202 * the MIME table as that contains '+' and '=' which get quoted when
1203 * URL-encoding. (The CGI still does the URL encoding but it is desirable to
1204 * avoid it being necessary.)
1205 */
1206static const char confirm_base64_table[] =
1207 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/.*";
1208
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1209static int c_register(struct conn *c,
1210 char **vec,
1211 int attribute((unused)) nvec) {
1212 char *buf, *cs;
1213 size_t bufsize;
1214 int offset;
1215
1216 /* The confirmation string is base64(username;nonce) */
10114017 1217 bufsize = strlen(vec[0]) + CONFIRM_SIZE + 2;
ba39faf6
RK
1218 buf = xmalloc_noptr(bufsize);
1219 offset = byte_snprintf(buf, bufsize, "%s;", vec[0]);
10114017 1220 gcry_randomize(buf + offset, CONFIRM_SIZE, GCRY_STRONG_RANDOM);
86e3aea7 1221 cs = generic_to_base64((uint8_t *)buf, offset + CONFIRM_SIZE,
1222 confirm_base64_table);
ba39faf6
RK
1223 if(trackdb_adduser(vec[0], vec[1], config->default_rights, vec[2], cs))
1224 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1225 else
1226 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cs));
1227 return 1;
1228}
1229
1230static int c_confirm(struct conn *c,
1231 char **vec,
1232 int attribute((unused)) nvec) {
1233 size_t nuser;
1234 char *user, *sep;
30365519 1235 rights_type rights;
1236 const char *host;
ba39faf6 1237
30365519 1238 /* Get some kind of peer identifcation */
1239 if(!(host = connection_host(c))) {
1240 sink_writes(ev_writer_sink(c->w), "530 Authentication failure\n");
1241 return 1;
1242 }
86e3aea7 1243 if(!(user = generic_base64(vec[0], &nuser, confirm_base64_table))
ba39faf6
RK
1244 || !(sep = memchr(user, ';', nuser))) {
1245 sink_writes(ev_writer_sink(c->w), "550 Malformed confirmation string\n");
1246 return 1;
1247 }
1248 *sep = 0;
30365519 1249 if(trackdb_confirm(user, vec[0], &rights))
ba39faf6 1250 sink_writes(ev_writer_sink(c->w), "550 Incorrect confirmation string\n");
30365519 1251 else {
1252 c->who = user;
1253 c->cookie = 0;
1254 c->rights = rights;
1255 if(strcmp(host, "local"))
1256 info("S%x %s confirmed from %s", c->tag, user, host);
1257 else
1258 c->rights |= RIGHT__LOCAL;
1259 /* Response contains username so client knows who they are acting as */
1260 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
1261 }
ba39faf6
RK
1262 return 1;
1263}
1264
460b9539 1265static const struct command {
eb5dc014 1266 /** @brief Command name */
460b9539 1267 const char *name;
eb5dc014
RK
1268
1269 /** @brief Minimum number of arguments */
1270 int minargs;
1271
1272 /** @brief Maximum number of arguments */
1273 int maxargs;
1274
1275 /** @brief Function to process command */
460b9539 1276 int (*fn)(struct conn *, char **, int);
eb5dc014
RK
1277
1278 /** @brief Rights required to execute command
1279 *
1280 * 0 means that the command can be issued without logging in. If multiple
1281 * bits are listed here any of those rights will do.
1282 */
1283 rights_type rights;
460b9539 1284} commands[] = {
0f55e905 1285 { "adduser", 2, 3, c_adduser, RIGHT_ADMIN|RIGHT__LOCAL },
eb5dc014 1286 { "allfiles", 0, 2, c_allfiles, RIGHT_READ },
ba39faf6 1287 { "confirm", 1, 1, c_confirm, 0 },
b12be54a 1288 { "cookie", 1, 1, c_cookie, 0 },
eb5dc014
RK
1289 { "deluser", 1, 1, c_deluser, RIGHT_ADMIN|RIGHT__LOCAL },
1290 { "dirs", 0, 2, c_dirs, RIGHT_READ },
1291 { "disable", 0, 1, c_disable, RIGHT_GLOBAL_PREFS },
1292 { "edituser", 3, 3, c_edituser, RIGHT_ADMIN|RIGHT_USERINFO },
1293 { "enable", 0, 0, c_enable, RIGHT_GLOBAL_PREFS },
1294 { "enabled", 0, 0, c_enabled, RIGHT_READ },
1295 { "exists", 1, 1, c_exists, RIGHT_READ },
1296 { "files", 0, 2, c_files, RIGHT_READ },
1297 { "get", 2, 2, c_get, RIGHT_READ },
1298 { "get-global", 1, 1, c_get_global, RIGHT_READ },
1299 { "length", 1, 1, c_length, RIGHT_READ },
1300 { "log", 0, 0, c_log, RIGHT_READ },
1301 { "make-cookie", 0, 0, c_make_cookie, RIGHT_READ },
1302 { "move", 2, 2, c_move, RIGHT_MOVE__MASK },
1303 { "moveafter", 1, INT_MAX, c_moveafter, RIGHT_MOVE__MASK },
1304 { "new", 0, 1, c_new, RIGHT_READ },
1305 { "nop", 0, 0, c_nop, 0 },
1306 { "part", 3, 3, c_part, RIGHT_READ },
1307 { "pause", 0, 0, c_pause, RIGHT_PAUSE },
1308 { "play", 1, 1, c_play, RIGHT_PLAY },
1309 { "playing", 0, 0, c_playing, RIGHT_READ },
1310 { "prefs", 1, 1, c_prefs, RIGHT_READ },
1311 { "queue", 0, 0, c_queue, RIGHT_READ },
1312 { "random-disable", 0, 0, c_random_disable, RIGHT_GLOBAL_PREFS },
1313 { "random-enable", 0, 0, c_random_enable, RIGHT_GLOBAL_PREFS },
1314 { "random-enabled", 0, 0, c_random_enabled, RIGHT_READ },
1315 { "recent", 0, 0, c_recent, RIGHT_READ },
1316 { "reconfigure", 0, 0, c_reconfigure, RIGHT_ADMIN },
ba39faf6 1317 { "register", 3, 3, c_register, RIGHT_REGISTER|RIGHT__LOCAL },
eb5dc014
RK
1318 { "remove", 1, 1, c_remove, RIGHT_REMOVE__MASK },
1319 { "rescan", 0, 0, c_rescan, RIGHT_RESCAN },
1320 { "resolve", 1, 1, c_resolve, RIGHT_READ },
1321 { "resume", 0, 0, c_resume, RIGHT_PAUSE },
1322 { "revoke", 0, 0, c_revoke, RIGHT_READ },
1323 { "rtp-address", 0, 0, c_rtp_address, 0 },
1324 { "scratch", 0, 1, c_scratch, RIGHT_SCRATCH__MASK },
1325 { "search", 1, 1, c_search, RIGHT_READ },
1326 { "set", 3, 3, c_set, RIGHT_PREFS, },
1327 { "set-global", 2, 2, c_set_global, RIGHT_GLOBAL_PREFS },
1328 { "shutdown", 0, 0, c_shutdown, RIGHT_ADMIN },
1329 { "stats", 0, 0, c_stats, RIGHT_READ },
1330 { "tags", 0, 0, c_tags, RIGHT_READ },
1331 { "unset", 2, 2, c_set, RIGHT_PREFS },
1332 { "unset-global", 1, 1, c_set_global, RIGHT_GLOBAL_PREFS },
460b9539 1333 { "user", 2, 2, c_user, 0 },
eb5dc014
RK
1334 { "userinfo", 2, 2, c_userinfo, RIGHT_READ },
1335 { "users", 0, 0, c_users, RIGHT_READ },
1336 { "version", 0, 0, c_version, RIGHT_READ },
1337 { "volume", 0, 2, c_volume, RIGHT_READ|RIGHT_VOLUME }
460b9539 1338};
1339
1340static void command_error(const char *msg, void *u) {
1341 struct conn *c = u;
1342
1343 sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg);
1344}
1345
1346/* process a command. Return 1 if complete, 0 if incomplete. */
1347static int command(struct conn *c, char *line) {
1348 char **vec;
1349 int nvec, n;
1350
1351 D(("server command %s", line));
f9635e06
RK
1352 /* We force everything into NFC as early as possible */
1353 if(!(line = utf8_compose_canon(line, strlen(line), 0))) {
1354 sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n");
1355 return 1;
1356 }
460b9539 1357 if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) {
1358 sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n");
1359 return 1;
1360 }
1361 if(nvec == 0) {
1362 sink_writes(ev_writer_sink(c->w), "500 do what?\n");
1363 return 1;
1364 }
1365 if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0)
1366 sink_writes(ev_writer_sink(c->w), "500 unknown command\n");
1367 else {
eb5dc014
RK
1368 if(commands[n].rights
1369 && !(c->rights & commands[n].rights)) {
834e7c4a 1370 error(0, "%s attempted %s but lacks required rights", c->who ? c->who : "NULL",
1371 commands[n].name);
b4a80f69 1372 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
460b9539 1373 return 1;
1374 }
1375 ++vec;
1376 --nvec;
1377 if(nvec < commands[n].minargs) {
1378 sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n");
1379 return 1;
1380 }
1381 if(nvec > commands[n].maxargs) {
1382 sink_writes(ev_writer_sink(c->w), "500 too many arguments\n");
1383 return 1;
1384 }
1385 return commands[n].fn(c, vec, nvec);
1386 }
1387 return 1; /* completed */
1388}
1389
1390/* redirect to the right reader callback for our current state */
1391static int redirect_reader_callback(ev_source *ev,
1392 ev_reader *reader,
460b9539 1393 void *ptr,
1394 size_t bytes,
1395 int eof,
1396 void *u) {
1397 struct conn *c = u;
1398
75d64210 1399 return c->reader(ev, reader, ptr, bytes, eof, u);
460b9539 1400}
1401
1402/* the main command reader */
1403static int reader_callback(ev_source attribute((unused)) *ev,
1404 ev_reader *reader,
460b9539 1405 void *ptr,
1406 size_t bytes,
1407 int eof,
1408 void *u) {
1409 struct conn *c = u;
1410 char *eol;
1411 int complete;
1412
1413 D(("server reader_callback"));
1414 while((eol = memchr(ptr, '\n', bytes))) {
1415 *eol++ = 0;
1416 ev_reader_consume(reader, eol - (char *)ptr);
1417 complete = command(c, ptr);
1418 bytes -= (eol - (char *)ptr);
1419 ptr = eol;
1420 if(!complete) {
1421 /* the command had better have set a new reader callback */
1422 if(bytes || eof)
1423 /* there are further bytes to read, or we are at eof; arrange for the
1424 * command's reader callback to handle them */
1425 return ev_reader_incomplete(reader);
1426 /* nothing's going on right now */
1427 return 0;
1428 }
1429 /* command completed, we can go around and handle the next one */
1430 }
1431 if(eof) {
1432 if(bytes)
1433 error(0, "S%x unterminated line", c->tag);
8d8b8c1f 1434 D(("normal reader close"));
397ef7bb
RK
1435 c->r = 0;
1436 if(c->w) {
8d8b8c1f 1437 D(("close associated writer"));
397ef7bb
RK
1438 ev_writer_close(c->w);
1439 c->w = 0;
1440 }
0126692c 1441 remove_connection(c);
460b9539 1442 }
1443 return 0;
1444}
1445
1446static int listen_callback(ev_source *ev,
1447 int fd,
1448 const struct sockaddr attribute((unused)) *remote,
1449 socklen_t attribute((unused)) rlen,
1450 void *u) {
1451 const struct listener *l = u;
1452 struct conn *c = xmalloc(sizeof *c);
1453 static unsigned tags;
1454
1455 D(("server listen_callback fd %d (%s)", fd, l->name));
1456 nonblock(fd);
1457 cloexec(fd);
1458 c->tag = tags++;
1459 c->ev = ev;
e8c92ba7
RK
1460 c->w = ev_writer_new(ev, fd, writer_error, c,
1461 "client writer");
1462 c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c,
1463 "client reader");
75d64210 1464 ev_tie(c->r, c->w);
460b9539 1465 c->fd = fd;
1466 c->reader = reader_callback;
1467 c->l = l;
eb5dc014 1468 c->rights = 0;
460b9539 1469 gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM);
7b32e917
RK
1470 sink_printf(ev_writer_sink(c->w), "231 %d %s %s\n",
1471 2,
b3141726
RK
1472 config->authorization_algorithm,
1473 hex(c->nonce, sizeof c->nonce));
460b9539 1474 return 0;
1475}
1476
1477int server_start(ev_source *ev, int pf,
1478 size_t socklen, const struct sockaddr *sa,
1479 const char *name) {
1480 int fd;
1481 struct listener *l = xmalloc(sizeof *l);
1482 static const int one = 1;
1483
1484 D(("server_init socket %s", name));
1485 fd = xsocket(pf, SOCK_STREAM, 0);
1486 xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
1487 if(bind(fd, sa, socklen) < 0) {
1488 error(errno, "error binding to %s", name);
1489 return -1;
1490 }
1491 xlisten(fd, 128);
1492 nonblock(fd);
1493 cloexec(fd);
1494 l->name = name;
1495 l->pf = pf;
e8c92ba7
RK
1496 if(ev_listen(ev, fd, listen_callback, l, "server listener"))
1497 exit(EXIT_FAILURE);
460b9539 1498 return fd;
1499}
1500
1501int server_stop(ev_source *ev, int fd) {
1502 xclose(fd);
1503 return ev_listen_cancel(ev, fd);
1504}
1505
1506/*
1507Local Variables:
1508c-basic-offset:2
1509comment-column:40
1510fill-column:79
1511End:
1512*/