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[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
75int volume_left, volume_right; /* last known volume */
76
18e6d6e6 77/** @brief Accept all well-formed login attempts
78 *
79 * Used in debugging.
80 */
81int wideopen;
82
460b9539 83struct listener {
84 const char *name;
85 int pf;
86};
87
397ef7bb 88/** @brief One client connection */
460b9539 89struct conn {
397ef7bb 90 /** @brief Read commands from here */
460b9539 91 ev_reader *r;
397ef7bb 92 /** @brief Send responses to here */
460b9539 93 ev_writer *w;
397ef7bb 94 /** @brief Underlying file descriptor */
460b9539 95 int fd;
397ef7bb 96 /** @brief Unique identifier for connection used in log messages */
460b9539 97 unsigned tag;
397ef7bb 98 /** @brief Login name or NULL */
460b9539 99 char *who;
397ef7bb 100 /** @brief Event loop */
460b9539 101 ev_source *ev;
397ef7bb 102 /** @brief Nonce chosen for this connection */
460b9539 103 unsigned char nonce[NONCE_SIZE];
397ef7bb
RK
104 /** @brief Current reader callback
105 *
106 * We change this depending on whether we're servicing the @b log command
107 */
460b9539 108 ev_reader_callback *reader;
397ef7bb 109 /** @brief Event log output sending to this connection */
460b9539 110 struct eventlog_output *lo;
397ef7bb 111 /** @brief Parent listener */
460b9539 112 const struct listener *l;
b12be54a
RK
113 /** @brief Login cookie or NULL */
114 char *cookie;
eb5dc014
RK
115 /** @brief Connection rights */
116 rights_type rights;
460b9539 117};
118
119static int reader_callback(ev_source *ev,
120 ev_reader *reader,
460b9539 121 void *ptr,
122 size_t bytes,
123 int eof,
124 void *u);
125
126static const char *noyes[] = { "no", "yes" };
127
397ef7bb
RK
128/** @brief Called when a connection's writer fails or is shut down
129 *
130 * If the connection still has a raeder that is cancelled.
131 */
460b9539 132static int writer_error(ev_source attribute((unused)) *ev,
460b9539 133 int errno_value,
134 void *u) {
135 struct conn *c = u;
136
8d8b8c1f 137 D(("server writer_error S%x %d", c->tag, errno_value));
460b9539 138 if(errno_value == 0) {
139 /* writer is done */
8d8b8c1f 140 D(("S%x writer completed", c->tag));
460b9539 141 } else {
142 if(errno_value != EPIPE)
143 error(errno_value, "S%x write error on socket", c->tag);
38b8221f 144 if(c->r) {
8d8b8c1f 145 D(("cancel reader"));
38b8221f
RK
146 ev_reader_cancel(c->r);
147 c->r = 0;
148 }
8d8b8c1f 149 D(("done cancel reader"));
460b9539 150 }
38b8221f 151 c->w = 0;
75d64210 152 ev_report(ev);
460b9539 153 return 0;
154}
155
397ef7bb
RK
156/** @brief Called when a conncetion's reader fails or is shut down
157 *
158 * If connection still has a writer then it is closed.
159 */
460b9539 160static int reader_error(ev_source attribute((unused)) *ev,
460b9539 161 int errno_value,
162 void *u) {
163 struct conn *c = u;
164
8d8b8c1f 165 D(("server reader_error S%x %d", c->tag, errno_value));
1563f6f6 166 error(errno_value, "S%x read error on socket", c->tag);
38b8221f
RK
167 if(c->w)
168 ev_writer_close(c->w);
169 c->w = 0;
170 c->r = 0;
768d7355 171 ev_report(ev);
460b9539 172 return 0;
173}
174
460b9539 175static int c_disable(struct conn *c, char **vec, int nvec) {
176 if(nvec == 0)
177 disable_playing(c->who);
178 else if(nvec == 1 && !strcmp(vec[0], "now"))
179 disable_playing(c->who);
180 else {
181 sink_writes(ev_writer_sink(c->w), "550 invalid argument\n");
182 return 1; /* completed */
183 }
184 sink_writes(ev_writer_sink(c->w), "250 OK\n");
185 return 1; /* completed */
186}
187
188static int c_enable(struct conn *c,
189 char attribute((unused)) **vec,
190 int attribute((unused)) nvec) {
191 enable_playing(c->who, c->ev);
192 /* Enable implicitly unpauses if there is nothing playing */
193 if(paused && !playing) resume_playing(c->who);
194 sink_writes(ev_writer_sink(c->w), "250 OK\n");
195 return 1; /* completed */
196}
197
198static int c_enabled(struct conn *c,
199 char attribute((unused)) **vec,
200 int attribute((unused)) nvec) {
201 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]);
202 return 1; /* completed */
203}
204
205static int c_play(struct conn *c, char **vec,
206 int attribute((unused)) nvec) {
207 const char *track;
208 struct queue_entry *q;
209
210 if(!trackdb_exists(vec[0])) {
211 sink_writes(ev_writer_sink(c->w), "550 track is not in database\n");
212 return 1;
213 }
214 if(!(track = trackdb_resolve(vec[0]))) {
215 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
216 return 1;
217 }
218 q = queue_add(track, c->who, WHERE_BEFORE_RANDOM);
219 queue_write();
220 /* If we added the first track, and something is playing, then prepare the
221 * new track. If nothing is playing then we don't bother as it wouldn't gain
222 * anything. */
223 if(q == qhead.next && playing)
224 prepare(c->ev, q);
81e440ce 225 sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id);
460b9539 226 /* If the queue was empty but we are for some reason paused then
227 * unpause. */
228 if(!playing) resume_playing(0);
229 play(c->ev);
230 return 1; /* completed */
231}
232
233static int c_remove(struct conn *c, char **vec,
234 int attribute((unused)) nvec) {
235 struct queue_entry *q;
eb5dc014 236 rights_type r;
460b9539 237
238 if(!(q = queue_find(vec[0]))) {
239 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
240 return 1;
241 }
eb5dc014
RK
242 if(q->submitter)
243 if(!strcmp(q->submitter, c->who))
834e7c4a 244 r = RIGHT_REMOVE_MINE|RIGHT_REMOVE_ANY;
eb5dc014
RK
245 else
246 r = RIGHT_REMOVE_ANY;
247 else
834e7c4a 248 r = RIGHT_REMOVE_RANDOM|RIGHT_REMOVE_ANY;
eb5dc014 249 if(!(c->rights & r)) {
834e7c4a 250 error(0, "%s attempted remove but lacks required rights", c->who);
eb5dc014 251 sink_writes(ev_writer_sink(c->w),
b4a80f69 252 "510 Not authorized to remove that track\n");
eb5dc014 253 return 1;
460b9539 254 }
255 queue_remove(q, c->who);
256 /* De-prepare the track. */
257 abandon(c->ev, q);
eb5dc014 258 /* If we removed a random track then add another one. */
460b9539 259 if(q->state == playing_random)
260 add_random_track();
261 /* Prepare whatever the next head track is. */
262 if(qhead.next != &qhead)
263 prepare(c->ev, qhead.next);
264 queue_write();
265 sink_writes(ev_writer_sink(c->w), "250 removed\n");
266 return 1; /* completed */
267}
268
269static int c_scratch(struct conn *c,
270 char **vec,
271 int nvec) {
eb5dc014 272 rights_type r;
834e7c4a 273
460b9539 274 if(!playing) {
275 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
276 return 1; /* completed */
277 }
eb5dc014
RK
278 /* TODO there is a bug here: if we specify an ID but it's not the currently
279 * playing track then you will get 550 if you weren't authorized to scratch
280 * the currently playing track. */
281 if(playing->submitter)
282 if(!strcmp(playing->submitter, c->who))
834e7c4a 283 r = RIGHT_SCRATCH_MINE|RIGHT_SCRATCH_ANY;
eb5dc014
RK
284 else
285 r = RIGHT_SCRATCH_ANY;
286 else
834e7c4a 287 r = RIGHT_SCRATCH_RANDOM|RIGHT_SCRATCH_ANY;
eb5dc014 288 if(!(c->rights & r)) {
834e7c4a 289 error(0, "%s attempted scratch but lacks required rights", c->who);
eb5dc014 290 sink_writes(ev_writer_sink(c->w),
b4a80f69 291 "510 Not authorized to scratch that track\n");
eb5dc014 292 return 1;
460b9539 293 }
294 scratch(c->who, nvec == 1 ? vec[0] : 0);
295 /* If you scratch an unpaused track then it is automatically unpaused */
296 resume_playing(0);
297 sink_writes(ev_writer_sink(c->w), "250 scratched\n");
298 return 1; /* completed */
299}
300
301static int c_pause(struct conn *c,
302 char attribute((unused)) **vec,
303 int attribute((unused)) nvec) {
304 if(!playing) {
305 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
306 return 1; /* completed */
307 }
308 if(paused) {
309 sink_writes(ev_writer_sink(c->w), "250 already paused\n");
310 return 1; /* completed */
311 }
312 if(pause_playing(c->who) < 0)
313 sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n");
314 else
315 sink_writes(ev_writer_sink(c->w), "250 paused\n");
316 return 1;
317}
318
319static int c_resume(struct conn *c,
320 char attribute((unused)) **vec,
321 int attribute((unused)) nvec) {
322 if(!paused) {
323 sink_writes(ev_writer_sink(c->w), "250 not paused\n");
324 return 1; /* completed */
325 }
326 resume_playing(c->who);
327 sink_writes(ev_writer_sink(c->w), "250 paused\n");
328 return 1;
329}
330
331static int c_shutdown(struct conn *c,
332 char attribute((unused)) **vec,
333 int attribute((unused)) nvec) {
334 info("S%x shut down by %s", c->tag, c->who);
335 sink_writes(ev_writer_sink(c->w), "250 shutting down\n");
336 ev_writer_flush(c->w);
337 quit(c->ev);
338}
339
340static int c_reconfigure(struct conn *c,
341 char attribute((unused)) **vec,
342 int attribute((unused)) nvec) {
343 info("S%x reconfigure by %s", c->tag, c->who);
344 if(reconfigure(c->ev, 1))
345 sink_writes(ev_writer_sink(c->w), "550 error reading new config\n");
346 else
347 sink_writes(ev_writer_sink(c->w), "250 installed new config\n");
348 return 1; /* completed */
349}
350
351static int c_rescan(struct conn *c,
352 char attribute((unused)) **vec,
353 int attribute((unused)) nvec) {
354 info("S%x rescan by %s", c->tag, c->who);
355 trackdb_rescan(c->ev);
356 sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n");
357 return 1; /* completed */
358}
359
360static int c_version(struct conn *c,
361 char attribute((unused)) **vec,
362 int attribute((unused)) nvec) {
363 /* VERSION had better only use the basic character set */
a05e4467 364 sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string);
460b9539 365 return 1; /* completed */
366}
367
368static int c_playing(struct conn *c,
369 char attribute((unused)) **vec,
370 int attribute((unused)) nvec) {
371 if(playing) {
372 queue_fix_sofar(playing);
373 playing->expected = 0;
374 sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing));
375 } else
376 sink_printf(ev_writer_sink(c->w), "259 nothing playing\n");
377 return 1; /* completed */
378}
379
b12be54a 380static const char *connection_host(struct conn *c) {
460b9539 381 union {
382 struct sockaddr sa;
383 struct sockaddr_in in;
384 struct sockaddr_in6 in6;
385 } u;
386 socklen_t l;
b12be54a 387 int n;
460b9539 388 char host[1024];
389
460b9539 390 /* get connection data */
391 l = sizeof u;
392 if(getpeername(c->fd, &u.sa, &l) < 0) {
393 error(errno, "S%x error calling getpeername", c->tag);
b12be54a 394 return 0;
460b9539 395 }
396 if(c->l->pf != PF_UNIX) {
397 if((n = getnameinfo(&u.sa, l,
398 host, sizeof host, 0, 0, NI_NUMERICHOST))) {
399 error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n));
b12be54a 400 return 0;
460b9539 401 }
b12be54a 402 return xstrdup(host);
18e6d6e6 403 } else
b12be54a
RK
404 return "local";
405}
406
407static int c_user(struct conn *c,
408 char **vec,
409 int attribute((unused)) nvec) {
eb5dc014 410 struct kvp *k;
f0feb22e 411 const char *res, *host, *password;
eb5dc014 412 rights_type rights;
b12be54a
RK
413
414 if(c->who) {
415 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
416 return 1;
417 }
418 /* get connection data */
419 if(!(host = connection_host(c))) {
420 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
421 return 1;
422 }
460b9539 423 /* find the user */
eb5dc014 424 k = trackdb_getuserinfo(vec[0]);
f0feb22e 425 /* reject nonexistent users */
eb5dc014
RK
426 if(!k) {
427 error(0, "S%x unknown user '%s' from %s", c->tag, vec[0], host);
428 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
429 return 1;
430 }
431 /* reject unconfirmed users */
432 if(kvp_get(k, "confirmation")) {
433 error(0, "S%x unconfirmed user '%s' from %s", c->tag, vec[0], host);
434 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
435 return 1;
436 }
437 password = kvp_get(k, "password");
438 if(!password) password = "";
0f55e905 439 if(parse_rights(kvp_get(k, "rights"), &rights, 1)) {
eb5dc014 440 error(0, "error parsing rights for %s", vec[0]);
18e6d6e6 441 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
442 return 1;
443 }
f0feb22e
RK
444 /* check whether the response is right */
445 res = authhash(c->nonce, sizeof c->nonce, password,
637fdea3 446 config->authorization_algorithm);
18e6d6e6 447 if(wideopen || (res && !strcmp(res, vec[1]))) {
448 c->who = vec[0];
eb5dc014 449 c->rights = rights;
18e6d6e6 450 /* currently we only bother logging remote connections */
eb5dc014 451 if(strcmp(host, "local")) {
18e6d6e6 452 info("S%x %s connected from %s", c->tag, vec[0], host);
eb5dc014
RK
453 c->rights |= RIGHT__LOCAL;
454 }
18e6d6e6 455 sink_writes(ev_writer_sink(c->w), "230 OK\n");
456 return 1;
460b9539 457 }
458 /* oops, response was wrong */
18e6d6e6 459 info("S%x authentication failure for %s from %s", c->tag, vec[0], host);
460b9539 460 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
461 return 1;
462}
463
464static int c_recent(struct conn *c,
465 char attribute((unused)) **vec,
466 int attribute((unused)) nvec) {
467 const struct queue_entry *q;
468
469 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
470 for(q = phead.next; q != &phead; q = q->next)
471 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
472 sink_writes(ev_writer_sink(c->w), ".\n");
473 return 1; /* completed */
474}
475
476static int c_queue(struct conn *c,
477 char attribute((unused)) **vec,
478 int attribute((unused)) nvec) {
479 struct queue_entry *q;
480 time_t when = 0;
481 const char *l;
482 long length;
483
484 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
485 if(playing_is_enabled() && !paused) {
486 if(playing) {
487 queue_fix_sofar(playing);
488 if((l = trackdb_get(playing->track, "_length"))
489 && (length = atol(l))) {
490 time(&when);
491 when += length - playing->sofar + config->gap;
492 }
493 } else
494 /* Nothing is playing but playing is enabled, so whatever is
495 * first in the queue can be expected to start immediately. */
496 time(&when);
497 }
498 for(q = qhead.next; q != &qhead; q = q->next) {
499 /* fill in estimated start time */
500 q->expected = when;
501 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
502 /* update for next track */
503 if(when) {
504 if((l = trackdb_get(q->track, "_length"))
505 && (length = atol(l)))
506 when += length + config->gap;
507 else
508 when = 0;
509 }
510 }
511 sink_writes(ev_writer_sink(c->w), ".\n");
512 return 1; /* completed */
513}
514
515static int output_list(struct conn *c, char **vec) {
516 while(*vec)
517 sink_printf(ev_writer_sink(c->w), "%s\n", *vec++);
518 sink_writes(ev_writer_sink(c->w), ".\n");
519 return 1;
520}
521
522static int files_dirs(struct conn *c,
523 char **vec,
524 int nvec,
525 enum trackdb_listable what) {
526 const char *dir, *re, *errstr;
527 int erroffset;
528 pcre *rec;
529 char **fvec, *key;
530
531 switch(nvec) {
532 case 0: dir = 0; re = 0; break;
533 case 1: dir = vec[0]; re = 0; break;
534 case 2: dir = vec[0]; re = vec[1]; break;
535 default: abort();
536 }
537 /* A bit of a bodge to make sure the args don't trample on cache keys */
538 if(dir && strchr(dir, '\n')) {
539 sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n");
540 return 1;
541 }
542 if(re && strchr(re, '\n')) {
543 sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n");
544 return 1;
545 }
546 /* We bother eliminating "" because the web interface is relatively
547 * likely to send it */
548 if(re && *re) {
549 byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re);
550 fvec = (char **)cache_get(&cache_files_type, key);
551 if(fvec) {
552 /* Got a cache hit, don't store the answer in the cache */
553 key = 0;
554 ++cache_files_hits;
555 rec = 0; /* quieten compiler */
556 } else {
557 /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer
558 * in the cache. */
559 if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8,
560 &errstr, &erroffset, 0))) {
561 sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n",
562 errstr);
563 return 1;
564 }
565 /* It only counts as a miss if the regexp was valid. */
566 ++cache_files_misses;
567 }
568 } else {
569 /* No regexp, don't bother caching the result */
570 rec = 0;
571 key = 0;
572 fvec = 0;
573 }
574 if(!fvec) {
575 /* No cache hit (either because a miss, or because we did not look) so do
576 * the lookup */
577 if(dir && *dir)
578 fvec = trackdb_list(dir, 0, what, rec);
579 else
580 fvec = trackdb_list(0, 0, what, rec);
581 }
582 if(key)
583 /* Put the answer in the cache */
584 cache_put(&cache_files_type, key, fvec);
585 sink_writes(ev_writer_sink(c->w), "253 Listing follow\n");
586 return output_list(c, fvec);
587}
588
589static int c_files(struct conn *c,
590 char **vec,
591 int nvec) {
592 return files_dirs(c, vec, nvec, trackdb_files);
593}
594
595static int c_dirs(struct conn *c,
596 char **vec,
597 int nvec) {
598 return files_dirs(c, vec, nvec, trackdb_directories);
599}
600
601static int c_allfiles(struct conn *c,
602 char **vec,
603 int nvec) {
604 return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files);
605}
606
607static int c_get(struct conn *c,
608 char **vec,
609 int attribute((unused)) nvec) {
610 const char *v;
611
612 if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1])))
7b32e917 613 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 614 else
fb1bc1f5 615 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 616 return 1;
617}
618
619static int c_length(struct conn *c,
620 char **vec,
621 int attribute((unused)) nvec) {
622 const char *track, *v;
623
624 if(!(track = trackdb_resolve(vec[0]))) {
625 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
626 return 1;
627 }
628 if((v = trackdb_get(track, "_length")))
7b32e917 629 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 630 else
631 sink_writes(ev_writer_sink(c->w), "550 not found\n");
632 return 1;
633}
634
635static int c_set(struct conn *c,
636 char **vec,
637 int attribute((unused)) nvec) {
638 if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2]))
639 sink_writes(ev_writer_sink(c->w), "250 OK\n");
640 else
641 sink_writes(ev_writer_sink(c->w), "550 not found\n");
642 return 1;
643}
644
645static int c_prefs(struct conn *c,
646 char **vec,
647 int attribute((unused)) nvec) {
648 struct kvp *k;
649
650 k = trackdb_get_all(vec[0]);
651 sink_writes(ev_writer_sink(c->w), "253 prefs follow\n");
652 for(; k; k = k->next)
653 if(k->name[0] != '_') /* omit internal values */
654 sink_printf(ev_writer_sink(c->w),
655 " %s %s\n", quoteutf8(k->name), quoteutf8(k->value));
656 sink_writes(ev_writer_sink(c->w), ".\n");
657 return 1;
658}
659
660static int c_exists(struct conn *c,
661 char **vec,
662 int attribute((unused)) nvec) {
663 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]);
664 return 1;
665}
666
667static void search_parse_error(const char *msg, void *u) {
668 *(const char **)u = msg;
669}
670
671static int c_search(struct conn *c,
672 char **vec,
673 int attribute((unused)) nvec) {
674 char **terms, **results;
675 int nterms, nresults, n;
676 const char *e = "unknown error";
677
678 /* This is a bit of a bodge. Initially it's there to make the eclient
679 * interface a bit more convenient to add searching to, but it has the more
680 * compelling advantage that if everything uses it, then interpretation of
681 * user-supplied search strings will be the same everywhere. */
682 if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) {
683 sink_printf(ev_writer_sink(c->w), "550 %s\n", e);
684 } else {
685 results = trackdb_search(terms, nterms, &nresults);
686 sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults);
687 for(n = 0; n < nresults; ++n)
688 sink_printf(ev_writer_sink(c->w), "%s\n", results[n]);
689 sink_writes(ev_writer_sink(c->w), ".\n");
690 }
691 return 1;
692}
693
694static int c_random_enable(struct conn *c,
695 char attribute((unused)) **vec,
696 int attribute((unused)) nvec) {
697 enable_random(c->who, c->ev);
698 /* Enable implicitly unpauses if there is nothing playing */
699 if(paused && !playing) resume_playing(c->who);
700 sink_writes(ev_writer_sink(c->w), "250 OK\n");
701 return 1; /* completed */
702}
703
704static int c_random_disable(struct conn *c,
705 char attribute((unused)) **vec,
706 int attribute((unused)) nvec) {
707 disable_random(c->who);
708 sink_writes(ev_writer_sink(c->w), "250 OK\n");
709 return 1; /* completed */
710}
711
712static int c_random_enabled(struct conn *c,
713 char attribute((unused)) **vec,
714 int attribute((unused)) nvec) {
715 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]);
716 return 1; /* completed */
717}
718
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719static void got_stats(char *stats, void *u) {
720 struct conn *const c = u;
721
722 sink_printf(ev_writer_sink(c->w), "253 stats\n%s\n.\n", stats);
723 /* Now we can start processing commands again */
724 ev_reader_enable(c->r);
725}
726
460b9539 727static int c_stats(struct conn *c,
728 char attribute((unused)) **vec,
729 int attribute((unused)) nvec) {
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730 trackdb_stats_subprocess(c->ev, got_stats, c);
731 return 0; /* not yet complete */
460b9539 732}
733
734static int c_volume(struct conn *c,
735 char **vec,
736 int nvec) {
737 int l, r, set;
738 char lb[32], rb[32];
eb5dc014 739 rights_type rights;
460b9539 740
741 switch(nvec) {
742 case 0:
743 set = 0;
744 break;
745 case 1:
746 l = r = atoi(vec[0]);
747 set = 1;
748 break;
749 case 2:
750 l = atoi(vec[0]);
751 r = atoi(vec[1]);
752 set = 1;
753 break;
754 default:
755 abort();
756 }
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757 rights = set ? RIGHT_VOLUME : RIGHT_READ;
758 if(!(c->rights & rights)) {
834e7c4a 759 error(0, "%s attempted to set volume but lacks required rights", c->who);
b4a80f69 760 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
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761 return 1;
762 }
460b9539 763 if(mixer_control(&l, &r, set))
764 sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n");
765 else {
766 sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r);
767 if(l != volume_left || r != volume_right) {
768 volume_left = l;
769 volume_right = r;
770 snprintf(lb, sizeof lb, "%d", l);
771 snprintf(rb, sizeof rb, "%d", r);
772 eventlog("volume", lb, rb, (char *)0);
773 }
774 }
775 return 1;
776}
777
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778/** @brief Called when data arrives on a log connection
779 *
780 * We just discard all such data. The client may occasionally send data as a
781 * keepalive.
782 */
783static int logging_reader_callback(ev_source attribute((unused)) *ev,
460b9539 784 ev_reader *reader,
397ef7bb 785 void attribute((unused)) *ptr,
460b9539 786 size_t bytes,
397ef7bb
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787 int attribute((unused)) eof,
788 void attribute((unused)) *u) {
460b9539 789 struct conn *c = u;
790
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791 ev_reader_consume(reader, bytes);
792 if(eof) {
793 /* Oops, that's all for now */
8d8b8c1f 794 D(("logging reader eof"));
397ef7bb 795 if(c->w) {
8d8b8c1f 796 D(("close writer"));
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797 ev_writer_close(c->w);
798 c->w = 0;
799 }
800 c->r = 0;
f6033c46 801 }
397ef7bb 802 return 0;
460b9539 803}
804
805static void logclient(const char *msg, void *user) {
806 struct conn *c = user;
807
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808 if(!c->w || !c->r) {
809 /* This connection has gone up in smoke for some reason */
810 eventlog_remove(c->lo);
811 return;
812 }
460b9539 813 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n",
814 (uintmax_t)time(0), msg);
815}
816
817static int c_log(struct conn *c,
818 char attribute((unused)) **vec,
819 int attribute((unused)) nvec) {
820 time_t now;
821
822 sink_writes(ev_writer_sink(c->w), "254 OK\n");
823 /* pump out initial state */
824 time(&now);
825 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
826 (uintmax_t)now,
827 playing_is_enabled() ? "enable_play" : "disable_play");
828 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
829 (uintmax_t)now,
830 random_is_enabled() ? "enable_random" : "disable_random");
831 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
832 (uintmax_t)now,
833 paused ? "pause" : "resume");
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RK
834 if(playing)
835 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state playing\n",
836 (uintmax_t)now);
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RK
837 /* Initial volume */
838 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" volume %d %d\n",
839 (uintmax_t)now, volume_left, volume_right);
460b9539 840 c->lo = xmalloc(sizeof *c->lo);
841 c->lo->fn = logclient;
842 c->lo->user = c;
843 eventlog_add(c->lo);
844 c->reader = logging_reader_callback;
845 return 0;
846}
847
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RK
848/** @brief Test whether a move is allowed
849 * @param c Connection
850 * @param qs List of IDs on queue
851 * @param nqs Number of IDs
852 * @return 0 if move is prohibited, non-0 if it is allowed
853 */
854static int has_move_rights(struct conn *c, struct queue_entry **qs, int nqs) {
855 rights_type r = 0;
856
857 for(; nqs > 0; ++qs, --nqs) {
858 struct queue_entry *const q = *qs;
859
860 if(q->submitter)
861 if(!strcmp(q->submitter, c->who))
834e7c4a 862 r |= RIGHT_MOVE_MINE|RIGHT_MOVE_ANY;
eb5dc014
RK
863 else
864 r |= RIGHT_MOVE_ANY;
865 else
834e7c4a 866 r |= RIGHT_MOVE_RANDOM|RIGHT_MOVE_ANY;
eb5dc014 867 }
834e7c4a 868 return !!(c->rights & r);
eb5dc014
RK
869}
870
460b9539 871static int c_move(struct conn *c,
872 char **vec,
873 int attribute((unused)) nvec) {
874 struct queue_entry *q;
875 int n;
876
460b9539 877 if(!(q = queue_find(vec[0]))) {
878 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
879 return 1;
880 }
eb5dc014 881 if(!has_move_rights(c, &q, 1)) {
834e7c4a 882 error(0, "%s attempted move but lacks required rights", c->who);
eb5dc014 883 sink_writes(ev_writer_sink(c->w),
b4a80f69 884 "510 Not authorized to move that track\n");
eb5dc014
RK
885 return 1;
886 }
460b9539 887 n = queue_move(q, atoi(vec[1]), c->who);
460b9539 888 sink_printf(ev_writer_sink(c->w), "252 %d\n", n);
889 /* If we've moved to the head of the queue then prepare the track. */
890 if(q == qhead.next)
891 prepare(c->ev, q);
892 return 1;
893}
894
895static int c_moveafter(struct conn *c,
896 char **vec,
897 int attribute((unused)) nvec) {
898 struct queue_entry *q, **qs;
899 int n;
900
460b9539 901 if(vec[0][0]) {
902 if(!(q = queue_find(vec[0]))) {
903 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
904 return 1;
905 }
906 } else
907 q = 0;
908 ++vec;
909 --nvec;
910 qs = xcalloc(nvec, sizeof *qs);
911 for(n = 0; n < nvec; ++n)
912 if(!(qs[n] = queue_find(vec[n]))) {
913 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
914 return 1;
915 }
eb5dc014 916 if(!has_move_rights(c, qs, nvec)) {
834e7c4a 917 error(0, "%s attempted moveafter but lacks required rights", c->who);
eb5dc014 918 sink_writes(ev_writer_sink(c->w),
b4a80f69 919 "510 Not authorized to move those tracks\n");
eb5dc014
RK
920 return 1;
921 }
460b9539 922 queue_moveafter(q, nvec, qs, c->who);
460b9539 923 sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n");
924 /* If we've moved to the head of the queue then prepare the track. */
925 if(q == qhead.next)
926 prepare(c->ev, q);
927 return 1;
928}
929
930static int c_part(struct conn *c,
931 char **vec,
932 int attribute((unused)) nvec) {
933 sink_printf(ev_writer_sink(c->w), "252 %s\n",
7b32e917 934 quoteutf8(trackdb_getpart(vec[0], vec[1], vec[2])));
460b9539 935 return 1;
936}
937
938static int c_resolve(struct conn *c,
939 char **vec,
940 int attribute((unused)) nvec) {
941 const char *track;
942
943 if(!(track = trackdb_resolve(vec[0]))) {
944 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
945 return 1;
946 }
7b32e917 947 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(track));
460b9539 948 return 1;
949}
950
951static int c_tags(struct conn *c,
952 char attribute((unused)) **vec,
953 int attribute((unused)) nvec) {
954 char **tags = trackdb_alltags();
955
956 sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n");
957 while(*tags) {
958 sink_printf(ev_writer_sink(c->w), "%s%s\n",
959 **tags == '.' ? "." : "", *tags);
960 ++tags;
961 }
962 sink_writes(ev_writer_sink(c->w), ".\n");
963 return 1; /* completed */
460b9539 964}
965
966static int c_set_global(struct conn *c,
967 char **vec,
968 int attribute((unused)) nvec) {
f9635e06
RK
969 if(vec[0][0] == '_') {
970 sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n");
971 return 1;
972 }
460b9539 973 trackdb_set_global(vec[0], vec[1], c->who);
974 sink_printf(ev_writer_sink(c->w), "250 OK\n");
975 return 1;
976}
977
978static int c_get_global(struct conn *c,
979 char **vec,
980 int attribute((unused)) nvec) {
981 const char *s = trackdb_get_global(vec[0]);
982
983 if(s)
7b32e917 984 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(s));
460b9539 985 else
fb1bc1f5 986 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 987 return 1;
988}
989
7858930d 990static int c_nop(struct conn *c,
991 char attribute((unused)) **vec,
992 int attribute((unused)) nvec) {
993 sink_printf(ev_writer_sink(c->w), "250 Quack\n");
994 return 1;
995}
996
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997static int c_new(struct conn *c,
998 char **vec,
999 int nvec) {
1000 char **tracks = trackdb_new(0, nvec > 0 ? atoi(vec[0]) : INT_MAX);
1001
1002 sink_printf(ev_writer_sink(c->w), "253 New track list follows\n");
1003 while(*tracks) {
1004 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1005 **tracks == '.' ? "." : "", *tracks);
1006 ++tracks;
1007 }
1008 sink_writes(ev_writer_sink(c->w), ".\n");
1009 return 1; /* completed */
1010
1011}
1012
ca831831
RK
1013static int c_rtp_address(struct conn *c,
1014 char attribute((unused)) **vec,
1015 int attribute((unused)) nvec) {
1016 if(config->speaker_backend == BACKEND_NETWORK) {
1017 sink_printf(ev_writer_sink(c->w), "252 %s %s\n",
1018 quoteutf8(config->broadcast.s[0]),
1019 quoteutf8(config->broadcast.s[1]));
1020 } else
1021 sink_writes(ev_writer_sink(c->w), "550 No RTP\n");
1022 return 1;
1023}
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1024
1025static int c_cookie(struct conn *c,
1026 char **vec,
1027 int attribute((unused)) nvec) {
1028 const char *host;
1029 char *user;
eb5dc014 1030 rights_type rights;
b12be54a
RK
1031
1032 /* Can't log in twice on the same connection */
1033 if(c->who) {
1034 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
1035 return 1;
1036 }
1037 /* Get some kind of peer identifcation */
1038 if(!(host = connection_host(c))) {
1039 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1040 return 1;
1041 }
1042 /* Check the cookie */
eb5dc014 1043 user = verify_cookie(vec[0], &rights);
b12be54a
RK
1044 if(!user) {
1045 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1046 return 1;
1047 }
1048 /* Log in */
e48c28bb 1049 c->who = user;
b12be54a 1050 c->cookie = vec[0];
eb5dc014
RK
1051 c->rights = rights;
1052 if(strcmp(host, "local")) {
b12be54a 1053 info("S%x %s connected with cookie from %s", c->tag, user, host);
eb5dc014
RK
1054 c->rights |= RIGHT__LOCAL;
1055 }
0227f67d
RK
1056 /* Response contains username so client knows who they are acting as */
1057 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
b12be54a
RK
1058 return 1;
1059}
1060
1061static int c_make_cookie(struct conn *c,
1062 char attribute((unused)) **vec,
1063 int attribute((unused)) nvec) {
1064 const char *cookie = make_cookie(c->who);
1065
1066 if(cookie)
eb5dc014 1067 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cookie));
b12be54a
RK
1068 else
1069 sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n");
1070 return 1;
1071}
1072
1073static int c_revoke(struct conn *c,
1074 char attribute((unused)) **vec,
1075 int attribute((unused)) nvec) {
1076 if(c->cookie) {
1077 revoke_cookie(c->cookie);
1078 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1079 } else
1080 sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n");
1081 return 1;
1082}
1083
f0feb22e
RK
1084static int c_adduser(struct conn *c,
1085 char **vec,
0f55e905
RK
1086 int nvec) {
1087 const char *rights;
1088
1089 if(nvec > 2) {
1090 rights = vec[2];
1091 if(parse_rights(vec[2], 0, 1)) {
1092 sink_writes(ev_writer_sink(c->w), "550 Invalid rights list\n");
1093 return -1;
1094 }
1095 } else
1096 rights = config->default_rights;
1097 if(trackdb_adduser(vec[0], vec[1], rights,
ba39faf6 1098 0/*email*/, 0/*confirmation*/))
f0feb22e
RK
1099 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1100 else
1101 sink_writes(ev_writer_sink(c->w), "250 User created\n");
1102 return 1;
1103}
1104
1105static int c_deluser(struct conn *c,
1106 char **vec,
1107 int attribute((unused)) nvec) {
f0feb22e 1108 if(trackdb_deluser(vec[0]))
ba39faf6 1109 sink_writes(ev_writer_sink(c->w), "550 Cannot delete user\n");
f0feb22e
RK
1110 else
1111 sink_writes(ev_writer_sink(c->w), "250 User deleted\n");
1112 return 1;
1113}
1114
1115static int c_edituser(struct conn *c,
5df73aeb 1116 char **vec,
f0feb22e 1117 int attribute((unused)) nvec) {
eb5dc014
RK
1118 /* RIGHT_ADMIN can do anything; otherwise you can only set your own email
1119 * address and password. */
1120 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1121 || (!strcmp(c->who, vec[0])
1122 && (!strcmp(vec[1], "email")
1123 || !strcmp(vec[1], "password")))) {
1124 if(trackdb_edituserinfo(vec[0], vec[1], vec[2]))
1125 sink_writes(ev_writer_sink(c->w), "550 Failed to change setting\n");
1126 else
1127 sink_writes(ev_writer_sink(c->w), "250 OK\n");
834e7c4a 1128 } else {
1129 error(0, "%s attempted edituser but lacks required rights", c->who);
b4a80f69 1130 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
834e7c4a 1131 }
f0feb22e
RK
1132 return 1;
1133}
1134
1135static int c_userinfo(struct conn *c,
1136 char attribute((unused)) **vec,
1137 int attribute((unused)) nvec) {
5df73aeb
RK
1138 struct kvp *k;
1139 const char *value;
eb5dc014
RK
1140
1141 /* RIGHT_ADMIN allows anything; otherwise you can only get your own email
1142 * address and righst list. */
1143 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1144 || (!strcmp(c->who, vec[0])
1145 && (!strcmp(vec[1], "email")
1146 || !strcmp(vec[1], "rights")))) {
1147 if((k = trackdb_getuserinfo(vec[0])))
1148 if((value = kvp_get(k, vec[1])))
1149 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(value));
1150 else
1151 sink_writes(ev_writer_sink(c->w), "555 Not set\n");
1152 else
1153 sink_writes(ev_writer_sink(c->w), "550 No such user\n");
834e7c4a 1154 } else {
1155 error(0, "%s attempted userinfo but lacks required rights", c->who);
b4a80f69 1156 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
834e7c4a 1157 }
f0feb22e
RK
1158 return 1;
1159}
1160
c3be4f19
RK
1161static int c_users(struct conn *c,
1162 char attribute((unused)) **vec,
1163 int attribute((unused)) nvec) {
1164 /* TODO de-dupe with c_tags */
1165 char **users = trackdb_listusers();
1166
1167 sink_writes(ev_writer_sink(c->w), "253 User list follows\n");
1168 while(*users) {
1169 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1170 **users == '.' ? "." : "", *users);
1171 ++users;
1172 }
1173 sink_writes(ev_writer_sink(c->w), ".\n");
1174 return 1; /* completed */
1175}
1176
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1177static int c_register(struct conn *c,
1178 char **vec,
1179 int attribute((unused)) nvec) {
1180 char *buf, *cs;
1181 size_t bufsize;
1182 int offset;
1183
1184 /* The confirmation string is base64(username;nonce) */
1185 bufsize = strlen(vec[0]) + NONCE_SIZE + 2;
1186 buf = xmalloc_noptr(bufsize);
1187 offset = byte_snprintf(buf, bufsize, "%s;", vec[0]);
1188 gcry_randomize(buf + offset, NONCE_SIZE, GCRY_STRONG_RANDOM);
1189 cs = mime_to_base64((uint8_t *)buf, offset + NONCE_SIZE);
1190 if(trackdb_adduser(vec[0], vec[1], config->default_rights, vec[2], cs))
1191 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1192 else
1193 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cs));
1194 return 1;
1195}
1196
1197static int c_confirm(struct conn *c,
1198 char **vec,
1199 int attribute((unused)) nvec) {
1200 size_t nuser;
1201 char *user, *sep;
1202
1203 if(!(user = mime_base64(vec[0], &nuser))
1204 || !(sep = memchr(user, ';', nuser))) {
1205 sink_writes(ev_writer_sink(c->w), "550 Malformed confirmation string\n");
1206 return 1;
1207 }
1208 *sep = 0;
1209 if(trackdb_confirm(user, vec[0]))
1210 sink_writes(ev_writer_sink(c->w), "550 Incorrect confirmation string\n");
1211 else
1212 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1213 return 1;
1214}
1215
460b9539 1216static const struct command {
eb5dc014 1217 /** @brief Command name */
460b9539 1218 const char *name;
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1219
1220 /** @brief Minimum number of arguments */
1221 int minargs;
1222
1223 /** @brief Maximum number of arguments */
1224 int maxargs;
1225
1226 /** @brief Function to process command */
460b9539 1227 int (*fn)(struct conn *, char **, int);
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1228
1229 /** @brief Rights required to execute command
1230 *
1231 * 0 means that the command can be issued without logging in. If multiple
1232 * bits are listed here any of those rights will do.
1233 */
1234 rights_type rights;
460b9539 1235} commands[] = {
0f55e905 1236 { "adduser", 2, 3, c_adduser, RIGHT_ADMIN|RIGHT__LOCAL },
eb5dc014 1237 { "allfiles", 0, 2, c_allfiles, RIGHT_READ },
ba39faf6 1238 { "confirm", 1, 1, c_confirm, 0 },
b12be54a 1239 { "cookie", 1, 1, c_cookie, 0 },
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1240 { "deluser", 1, 1, c_deluser, RIGHT_ADMIN|RIGHT__LOCAL },
1241 { "dirs", 0, 2, c_dirs, RIGHT_READ },
1242 { "disable", 0, 1, c_disable, RIGHT_GLOBAL_PREFS },
1243 { "edituser", 3, 3, c_edituser, RIGHT_ADMIN|RIGHT_USERINFO },
1244 { "enable", 0, 0, c_enable, RIGHT_GLOBAL_PREFS },
1245 { "enabled", 0, 0, c_enabled, RIGHT_READ },
1246 { "exists", 1, 1, c_exists, RIGHT_READ },
1247 { "files", 0, 2, c_files, RIGHT_READ },
1248 { "get", 2, 2, c_get, RIGHT_READ },
1249 { "get-global", 1, 1, c_get_global, RIGHT_READ },
1250 { "length", 1, 1, c_length, RIGHT_READ },
1251 { "log", 0, 0, c_log, RIGHT_READ },
1252 { "make-cookie", 0, 0, c_make_cookie, RIGHT_READ },
1253 { "move", 2, 2, c_move, RIGHT_MOVE__MASK },
1254 { "moveafter", 1, INT_MAX, c_moveafter, RIGHT_MOVE__MASK },
1255 { "new", 0, 1, c_new, RIGHT_READ },
1256 { "nop", 0, 0, c_nop, 0 },
1257 { "part", 3, 3, c_part, RIGHT_READ },
1258 { "pause", 0, 0, c_pause, RIGHT_PAUSE },
1259 { "play", 1, 1, c_play, RIGHT_PLAY },
1260 { "playing", 0, 0, c_playing, RIGHT_READ },
1261 { "prefs", 1, 1, c_prefs, RIGHT_READ },
1262 { "queue", 0, 0, c_queue, RIGHT_READ },
1263 { "random-disable", 0, 0, c_random_disable, RIGHT_GLOBAL_PREFS },
1264 { "random-enable", 0, 0, c_random_enable, RIGHT_GLOBAL_PREFS },
1265 { "random-enabled", 0, 0, c_random_enabled, RIGHT_READ },
1266 { "recent", 0, 0, c_recent, RIGHT_READ },
1267 { "reconfigure", 0, 0, c_reconfigure, RIGHT_ADMIN },
ba39faf6 1268 { "register", 3, 3, c_register, RIGHT_REGISTER|RIGHT__LOCAL },
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1269 { "remove", 1, 1, c_remove, RIGHT_REMOVE__MASK },
1270 { "rescan", 0, 0, c_rescan, RIGHT_RESCAN },
1271 { "resolve", 1, 1, c_resolve, RIGHT_READ },
1272 { "resume", 0, 0, c_resume, RIGHT_PAUSE },
1273 { "revoke", 0, 0, c_revoke, RIGHT_READ },
1274 { "rtp-address", 0, 0, c_rtp_address, 0 },
1275 { "scratch", 0, 1, c_scratch, RIGHT_SCRATCH__MASK },
1276 { "search", 1, 1, c_search, RIGHT_READ },
1277 { "set", 3, 3, c_set, RIGHT_PREFS, },
1278 { "set-global", 2, 2, c_set_global, RIGHT_GLOBAL_PREFS },
1279 { "shutdown", 0, 0, c_shutdown, RIGHT_ADMIN },
1280 { "stats", 0, 0, c_stats, RIGHT_READ },
1281 { "tags", 0, 0, c_tags, RIGHT_READ },
1282 { "unset", 2, 2, c_set, RIGHT_PREFS },
1283 { "unset-global", 1, 1, c_set_global, RIGHT_GLOBAL_PREFS },
460b9539 1284 { "user", 2, 2, c_user, 0 },
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1285 { "userinfo", 2, 2, c_userinfo, RIGHT_READ },
1286 { "users", 0, 0, c_users, RIGHT_READ },
1287 { "version", 0, 0, c_version, RIGHT_READ },
1288 { "volume", 0, 2, c_volume, RIGHT_READ|RIGHT_VOLUME }
460b9539 1289};
1290
1291static void command_error(const char *msg, void *u) {
1292 struct conn *c = u;
1293
1294 sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg);
1295}
1296
1297/* process a command. Return 1 if complete, 0 if incomplete. */
1298static int command(struct conn *c, char *line) {
1299 char **vec;
1300 int nvec, n;
1301
1302 D(("server command %s", line));
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1303 /* We force everything into NFC as early as possible */
1304 if(!(line = utf8_compose_canon(line, strlen(line), 0))) {
1305 sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n");
1306 return 1;
1307 }
460b9539 1308 if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) {
1309 sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n");
1310 return 1;
1311 }
1312 if(nvec == 0) {
1313 sink_writes(ev_writer_sink(c->w), "500 do what?\n");
1314 return 1;
1315 }
1316 if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0)
1317 sink_writes(ev_writer_sink(c->w), "500 unknown command\n");
1318 else {
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1319 if(commands[n].rights
1320 && !(c->rights & commands[n].rights)) {
834e7c4a 1321 error(0, "%s attempted %s but lacks required rights", c->who ? c->who : "NULL",
1322 commands[n].name);
b4a80f69 1323 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
460b9539 1324 return 1;
1325 }
1326 ++vec;
1327 --nvec;
1328 if(nvec < commands[n].minargs) {
1329 sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n");
1330 return 1;
1331 }
1332 if(nvec > commands[n].maxargs) {
1333 sink_writes(ev_writer_sink(c->w), "500 too many arguments\n");
1334 return 1;
1335 }
1336 return commands[n].fn(c, vec, nvec);
1337 }
1338 return 1; /* completed */
1339}
1340
1341/* redirect to the right reader callback for our current state */
1342static int redirect_reader_callback(ev_source *ev,
1343 ev_reader *reader,
460b9539 1344 void *ptr,
1345 size_t bytes,
1346 int eof,
1347 void *u) {
1348 struct conn *c = u;
1349
75d64210 1350 return c->reader(ev, reader, ptr, bytes, eof, u);
460b9539 1351}
1352
1353/* the main command reader */
1354static int reader_callback(ev_source attribute((unused)) *ev,
1355 ev_reader *reader,
460b9539 1356 void *ptr,
1357 size_t bytes,
1358 int eof,
1359 void *u) {
1360 struct conn *c = u;
1361 char *eol;
1362 int complete;
1363
1364 D(("server reader_callback"));
1365 while((eol = memchr(ptr, '\n', bytes))) {
1366 *eol++ = 0;
1367 ev_reader_consume(reader, eol - (char *)ptr);
1368 complete = command(c, ptr);
1369 bytes -= (eol - (char *)ptr);
1370 ptr = eol;
1371 if(!complete) {
1372 /* the command had better have set a new reader callback */
1373 if(bytes || eof)
1374 /* there are further bytes to read, or we are at eof; arrange for the
1375 * command's reader callback to handle them */
1376 return ev_reader_incomplete(reader);
1377 /* nothing's going on right now */
1378 return 0;
1379 }
1380 /* command completed, we can go around and handle the next one */
1381 }
1382 if(eof) {
1383 if(bytes)
1384 error(0, "S%x unterminated line", c->tag);
8d8b8c1f 1385 D(("normal reader close"));
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1386 c->r = 0;
1387 if(c->w) {
8d8b8c1f 1388 D(("close associated writer"));
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1389 ev_writer_close(c->w);
1390 c->w = 0;
1391 }
460b9539 1392 }
1393 return 0;
1394}
1395
1396static int listen_callback(ev_source *ev,
1397 int fd,
1398 const struct sockaddr attribute((unused)) *remote,
1399 socklen_t attribute((unused)) rlen,
1400 void *u) {
1401 const struct listener *l = u;
1402 struct conn *c = xmalloc(sizeof *c);
1403 static unsigned tags;
1404
1405 D(("server listen_callback fd %d (%s)", fd, l->name));
1406 nonblock(fd);
1407 cloexec(fd);
1408 c->tag = tags++;
1409 c->ev = ev;
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1410 c->w = ev_writer_new(ev, fd, writer_error, c,
1411 "client writer");
1412 c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c,
1413 "client reader");
75d64210 1414 ev_tie(c->r, c->w);
460b9539 1415 c->fd = fd;
1416 c->reader = reader_callback;
1417 c->l = l;
eb5dc014 1418 c->rights = 0;
460b9539 1419 gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM);
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1420 sink_printf(ev_writer_sink(c->w), "231 %d %s %s\n",
1421 2,
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1422 config->authorization_algorithm,
1423 hex(c->nonce, sizeof c->nonce));
460b9539 1424 return 0;
1425}
1426
1427int server_start(ev_source *ev, int pf,
1428 size_t socklen, const struct sockaddr *sa,
1429 const char *name) {
1430 int fd;
1431 struct listener *l = xmalloc(sizeof *l);
1432 static const int one = 1;
1433
1434 D(("server_init socket %s", name));
1435 fd = xsocket(pf, SOCK_STREAM, 0);
1436 xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
1437 if(bind(fd, sa, socklen) < 0) {
1438 error(errno, "error binding to %s", name);
1439 return -1;
1440 }
1441 xlisten(fd, 128);
1442 nonblock(fd);
1443 cloexec(fd);
1444 l->name = name;
1445 l->pf = pf;
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1446 if(ev_listen(ev, fd, listen_callback, l, "server listener"))
1447 exit(EXIT_FAILURE);
460b9539 1448 return fd;
1449}
1450
1451int server_stop(ev_source *ev, int fd) {
1452 xclose(fd);
1453 return ev_listen_cancel(ev, fd);
1454}
1455
1456/*
1457Local Variables:
1458c-basic-offset:2
1459comment-column:40
1460fill-column:79
1461End:
1462*/