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Server and Python interface now support schedule-* commands. Tests to
[disorder] / server / server.c
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1/*
2 * This file is part of DisOrder.
3 * Copyright (C) 2004-2008 Richard Kettlewell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22#include "types.h"
23
24#include <pwd.h>
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <sys/time.h>
28#include <unistd.h>
29#include <stdlib.h>
30#include <string.h>
31#include <errno.h>
32#include <fcntl.h>
33#include <gcrypt.h>
34#include <stddef.h>
35#include <time.h>
36#include <limits.h>
37#include <pcre.h>
38#include <netdb.h>
39#include <netinet/in.h>
40
41#include "event.h"
42#include "server.h"
43#include "syscalls.h"
44#include "queue.h"
45#include "server-queue.h"
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"
54#include "rights.h"
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"
67#include "unicode.h"
68#include "cookies.h"
69#include "base64.h"
70#include "hash.h"
71#include "mime.h"
72#include "sendmail.h"
73#include "wstat.h"
74#include "schedule.h"
75
76#ifndef NONCE_SIZE
77# define NONCE_SIZE 16
78#endif
79
80#ifndef CONFIRM_SIZE
81# define CONFIRM_SIZE 10
82#endif
83
84int volume_left, volume_right; /* last known volume */
85
86/** @brief Accept all well-formed login attempts
87 *
88 * Used in debugging.
89 */
90int wideopen;
91
92struct listener {
93 const char *name;
94 int pf;
95};
96
97/** @brief One client connection */
98struct conn {
99 /** @brief Read commands from here */
100 ev_reader *r;
101 /** @brief Send responses to here */
102 ev_writer *w;
103 /** @brief Underlying file descriptor */
104 int fd;
105 /** @brief Unique identifier for connection used in log messages */
106 unsigned tag;
107 /** @brief Login name or NULL */
108 char *who;
109 /** @brief Event loop */
110 ev_source *ev;
111 /** @brief Nonce chosen for this connection */
112 unsigned char nonce[NONCE_SIZE];
113 /** @brief Current reader callback
114 *
115 * We change this depending on whether we're servicing the @b log command
116 */
117 ev_reader_callback *reader;
118 /** @brief Event log output sending to this connection */
119 struct eventlog_output *lo;
120 /** @brief Parent listener */
121 const struct listener *l;
122 /** @brief Login cookie or NULL */
123 char *cookie;
124 /** @brief Connection rights */
125 rights_type rights;
126 /** @brief Next connection */
127 struct conn *next;
128 /** @brief True if pending rescan had 'wait' set */
129 int rescan_wait;
130};
131
132/** @brief Linked list of connections */
133static struct conn *connections;
134
135static int reader_callback(ev_source *ev,
136 ev_reader *reader,
137 void *ptr,
138 size_t bytes,
139 int eof,
140 void *u);
141
142static const char *noyes[] = { "no", "yes" };
143
144/** @brief Remove a connection from the connection list */
145static void remove_connection(struct conn *c) {
146 struct conn **cc;
147
148 for(cc = &connections; *cc && *cc != c; cc = &(*cc)->next)
149 ;
150 if(*cc)
151 *cc = c->next;
152}
153
154/** @brief Called when a connection's writer fails or is shut down
155 *
156 * If the connection still has a raeder that is cancelled.
157 */
158static int writer_error(ev_source attribute((unused)) *ev,
159 int errno_value,
160 void *u) {
161 struct conn *c = u;
162
163 D(("server writer_error S%x %d", c->tag, errno_value));
164 if(errno_value == 0) {
165 /* writer is done */
166 D(("S%x writer completed", c->tag));
167 } else {
168 if(errno_value != EPIPE)
169 error(errno_value, "S%x write error on socket", c->tag);
170 if(c->r) {
171 D(("cancel reader"));
172 ev_reader_cancel(c->r);
173 c->r = 0;
174 }
175 D(("done cancel reader"));
176 }
177 c->w = 0;
178 ev_report(ev);
179 remove_connection(c);
180 return 0;
181}
182
183/** @brief Called when a conncetion's reader fails or is shut down
184 *
185 * If connection still has a writer then it is closed.
186 */
187static int reader_error(ev_source attribute((unused)) *ev,
188 int errno_value,
189 void *u) {
190 struct conn *c = u;
191
192 D(("server reader_error S%x %d", c->tag, errno_value));
193 error(errno_value, "S%x read error on socket", c->tag);
194 if(c->w)
195 ev_writer_close(c->w);
196 c->w = 0;
197 c->r = 0;
198 ev_report(ev);
199 remove_connection(c);
200 return 0;
201}
202
203static int c_disable(struct conn *c, char **vec, int nvec) {
204 if(nvec == 0)
205 disable_playing(c->who);
206 else if(nvec == 1 && !strcmp(vec[0], "now"))
207 disable_playing(c->who);
208 else {
209 sink_writes(ev_writer_sink(c->w), "550 invalid argument\n");
210 return 1; /* completed */
211 }
212 sink_writes(ev_writer_sink(c->w), "250 OK\n");
213 return 1; /* completed */
214}
215
216static int c_enable(struct conn *c,
217 char attribute((unused)) **vec,
218 int attribute((unused)) nvec) {
219 enable_playing(c->who, c->ev);
220 /* Enable implicitly unpauses if there is nothing playing */
221 if(paused && !playing) resume_playing(c->who);
222 sink_writes(ev_writer_sink(c->w), "250 OK\n");
223 return 1; /* completed */
224}
225
226static int c_enabled(struct conn *c,
227 char attribute((unused)) **vec,
228 int attribute((unused)) nvec) {
229 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]);
230 return 1; /* completed */
231}
232
233static int c_play(struct conn *c, char **vec,
234 int attribute((unused)) nvec) {
235 const char *track;
236 struct queue_entry *q;
237
238 if(!trackdb_exists(vec[0])) {
239 sink_writes(ev_writer_sink(c->w), "550 track is not in database\n");
240 return 1;
241 }
242 if(!(track = trackdb_resolve(vec[0]))) {
243 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
244 return 1;
245 }
246 q = queue_add(track, c->who, WHERE_BEFORE_RANDOM);
247 queue_write();
248 /* If we added the first track, and something is playing, then prepare the
249 * new track. If nothing is playing then we don't bother as it wouldn't gain
250 * anything. */
251 if(q == qhead.next && playing)
252 prepare(c->ev, q);
253 sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id);
254 /* If the queue was empty but we are for some reason paused then
255 * unpause. */
256 if(!playing) resume_playing(0);
257 play(c->ev);
258 return 1; /* completed */
259}
260
261static int c_remove(struct conn *c, char **vec,
262 int attribute((unused)) nvec) {
263 struct queue_entry *q;
264
265 if(!(q = queue_find(vec[0]))) {
266 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
267 return 1;
268 }
269 if(!right_removable(c->rights, c->who, q)) {
270 error(0, "%s attempted remove but lacks required rights", c->who);
271 sink_writes(ev_writer_sink(c->w),
272 "510 Not authorized to remove that track\n");
273 return 1;
274 }
275 queue_remove(q, c->who);
276 /* De-prepare the track. */
277 abandon(c->ev, q);
278 /* See about adding a new random track */
279 add_random_track(c->ev);
280 /* Prepare whatever the next head track is. */
281 if(qhead.next != &qhead)
282 prepare(c->ev, qhead.next);
283 queue_write();
284 sink_writes(ev_writer_sink(c->w), "250 removed\n");
285 return 1; /* completed */
286}
287
288static int c_scratch(struct conn *c,
289 char **vec,
290 int nvec) {
291 if(!playing) {
292 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
293 return 1; /* completed */
294 }
295 /* TODO there is a bug here: if we specify an ID but it's not the currently
296 * playing track then you will get 550 if you weren't authorized to scratch
297 * the currently playing track. */
298 if(!right_scratchable(c->rights, c->who, playing)) {
299 error(0, "%s attempted scratch but lacks required rights", c->who);
300 sink_writes(ev_writer_sink(c->w),
301 "510 Not authorized to scratch that track\n");
302 return 1;
303 }
304 scratch(c->who, nvec == 1 ? vec[0] : 0);
305 /* If you scratch an unpaused track then it is automatically unpaused */
306 resume_playing(0);
307 sink_writes(ev_writer_sink(c->w), "250 scratched\n");
308 return 1; /* completed */
309}
310
311static int c_pause(struct conn *c,
312 char attribute((unused)) **vec,
313 int attribute((unused)) nvec) {
314 if(!playing) {
315 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
316 return 1; /* completed */
317 }
318 if(paused) {
319 sink_writes(ev_writer_sink(c->w), "250 already paused\n");
320 return 1; /* completed */
321 }
322 if(pause_playing(c->who) < 0)
323 sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n");
324 else
325 sink_writes(ev_writer_sink(c->w), "250 paused\n");
326 return 1;
327}
328
329static int c_resume(struct conn *c,
330 char attribute((unused)) **vec,
331 int attribute((unused)) nvec) {
332 if(!paused) {
333 sink_writes(ev_writer_sink(c->w), "250 not paused\n");
334 return 1; /* completed */
335 }
336 resume_playing(c->who);
337 sink_writes(ev_writer_sink(c->w), "250 paused\n");
338 return 1;
339}
340
341static int c_shutdown(struct conn *c,
342 char attribute((unused)) **vec,
343 int attribute((unused)) nvec) {
344 info("S%x shut down by %s", c->tag, c->who);
345 sink_writes(ev_writer_sink(c->w), "250 shutting down\n");
346 ev_writer_flush(c->w);
347 quit(c->ev);
348}
349
350static int c_reconfigure(struct conn *c,
351 char attribute((unused)) **vec,
352 int attribute((unused)) nvec) {
353 info("S%x reconfigure by %s", c->tag, c->who);
354 if(reconfigure(c->ev, 1))
355 sink_writes(ev_writer_sink(c->w), "550 error reading new config\n");
356 else
357 sink_writes(ev_writer_sink(c->w), "250 installed new config\n");
358 return 1; /* completed */
359}
360
361static void finished_rescan(void *ru) {
362 struct conn *const c = ru;
363
364 sink_writes(ev_writer_sink(c->w), "250 rescan completed\n");
365 /* Turn this connection back on */
366 ev_reader_enable(c->r);
367}
368
369static void start_fresh_rescan(void *ru) {
370 struct conn *const c = ru;
371
372 if(trackdb_rescan_underway()) {
373 /* Some other waiter beat us to it. However in this case we're happy to
374 * piggyback; the requirement is that a new rescan be started, not that it
375 * was _our_ rescan. */
376 if(c->rescan_wait) {
377 /* We block until the rescan completes */
378 trackdb_add_rescanned(finished_rescan, c);
379 } else {
380 /* We report that the new rescan has started */
381 sink_writes(ev_writer_sink(c->w), "250 rescan initiated\n");
382 /* Turn this connection back on */
383 ev_reader_enable(c->r);
384 }
385 } else {
386 /* We are the first connection to get a callback so we must start a
387 * rescan. */
388 if(c->rescan_wait) {
389 /* We want to block until the new rescan completes */
390 trackdb_rescan(c->ev, 1/*check*/, finished_rescan, c);
391 } else {
392 /* We can report back immediately */
393 trackdb_rescan(c->ev, 1/*check*/, 0, 0);
394 sink_writes(ev_writer_sink(c->w), "250 rescan initiated\n");
395 /* Turn this connection back on */
396 ev_reader_enable(c->r);
397 }
398 }
399}
400
401static int c_rescan(struct conn *c,
402 char **vec,
403 int nvec) {
404 int wait = 0, fresh = 0, n;
405
406 /* Parse flags */
407 for(n = 0; n < nvec; ++n) {
408 if(!strcmp(vec[n], "wait"))
409 wait = 1; /* wait for rescan to complete */
410#if 0
411 /* Currently disabled because untested (and hard to test). */
412 else if(!strcmp(vec[n], "fresh"))
413 fresh = 1; /* don't piggyback underway rescan */
414#endif
415 else {
416 sink_writes(ev_writer_sink(c->w), "550 unknown flag\n");
417 return 1; /* completed */
418 }
419 }
420 /* Report what was requested */
421 info("S%x rescan by %s (%s %s)", c->tag, c->who,
422 wait ? "wait" : "",
423 fresh ? "fresh" : "");
424 if(trackdb_rescan_underway()) {
425 if(fresh) {
426 /* We want a fresh rescan but there is already one underway. Arrange a
427 * callback when it completes and then set off a new one. */
428 c->rescan_wait = wait;
429 trackdb_add_rescanned(start_fresh_rescan, c);
430 if(wait)
431 return 0;
432 else {
433 sink_writes(ev_writer_sink(c->w), "250 rescan queued\n");
434 return 1;
435 }
436 } else {
437 /* There's a rescan underway, and it's acceptable to piggyback on it */
438 if(wait) {
439 /* We want to block until completion. */
440 trackdb_add_rescanned(finished_rescan, c);
441 return 0;
442 } else {
443 /* We don't want to block. So we just report that things are in
444 * hand. */
445 sink_writes(ev_writer_sink(c->w), "250 rescan already underway\n");
446 return 1;
447 }
448 }
449 } else {
450 /* No rescan is underway. fresh is therefore irrelevant. */
451 if(wait) {
452 /* We want to block until completion */
453 trackdb_rescan(c->ev, 1/*check*/, finished_rescan, c);
454 return 0;
455 } else {
456 /* We don't want to block. */
457 trackdb_rescan(c->ev, 1/*check*/, 0, 0);
458 sink_writes(ev_writer_sink(c->w), "250 rescan initiated\n");
459 return 1; /* completed */
460 }
461 }
462}
463
464static int c_version(struct conn *c,
465 char attribute((unused)) **vec,
466 int attribute((unused)) nvec) {
467 /* VERSION had better only use the basic character set */
468 sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string);
469 return 1; /* completed */
470}
471
472static int c_playing(struct conn *c,
473 char attribute((unused)) **vec,
474 int attribute((unused)) nvec) {
475 if(playing) {
476 queue_fix_sofar(playing);
477 playing->expected = 0;
478 sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing));
479 } else
480 sink_printf(ev_writer_sink(c->w), "259 nothing playing\n");
481 return 1; /* completed */
482}
483
484static const char *connection_host(struct conn *c) {
485 union {
486 struct sockaddr sa;
487 struct sockaddr_in in;
488 struct sockaddr_in6 in6;
489 } u;
490 socklen_t l;
491 int n;
492 char host[1024];
493
494 /* get connection data */
495 l = sizeof u;
496 if(getpeername(c->fd, &u.sa, &l) < 0) {
497 error(errno, "S%x error calling getpeername", c->tag);
498 return 0;
499 }
500 if(c->l->pf != PF_UNIX) {
501 if((n = getnameinfo(&u.sa, l,
502 host, sizeof host, 0, 0, NI_NUMERICHOST))) {
503 error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n));
504 return 0;
505 }
506 return xstrdup(host);
507 } else
508 return "local";
509}
510
511static int c_user(struct conn *c,
512 char **vec,
513 int attribute((unused)) nvec) {
514 struct kvp *k;
515 const char *res, *host, *password;
516 rights_type rights;
517
518 if(c->who) {
519 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
520 return 1;
521 }
522 /* get connection data */
523 if(!(host = connection_host(c))) {
524 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
525 return 1;
526 }
527 /* find the user */
528 k = trackdb_getuserinfo(vec[0]);
529 /* reject nonexistent users */
530 if(!k) {
531 error(0, "S%x unknown user '%s' from %s", c->tag, vec[0], host);
532 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
533 return 1;
534 }
535 /* reject unconfirmed users */
536 if(kvp_get(k, "confirmation")) {
537 error(0, "S%x unconfirmed user '%s' from %s", c->tag, vec[0], host);
538 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
539 return 1;
540 }
541 password = kvp_get(k, "password");
542 if(!password) password = "";
543 if(parse_rights(kvp_get(k, "rights"), &rights, 1)) {
544 error(0, "error parsing rights for %s", vec[0]);
545 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
546 return 1;
547 }
548 /* check whether the response is right */
549 res = authhash(c->nonce, sizeof c->nonce, password,
550 config->authorization_algorithm);
551 if(wideopen || (res && !strcmp(res, vec[1]))) {
552 c->who = vec[0];
553 c->rights = rights;
554 /* currently we only bother logging remote connections */
555 if(strcmp(host, "local"))
556 info("S%x %s connected from %s", c->tag, vec[0], host);
557 else
558 c->rights |= RIGHT__LOCAL;
559 sink_writes(ev_writer_sink(c->w), "230 OK\n");
560 return 1;
561 }
562 /* oops, response was wrong */
563 info("S%x authentication failure for %s from %s", c->tag, vec[0], host);
564 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
565 return 1;
566}
567
568static int c_recent(struct conn *c,
569 char attribute((unused)) **vec,
570 int attribute((unused)) nvec) {
571 const struct queue_entry *q;
572
573 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
574 for(q = phead.next; q != &phead; q = q->next)
575 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
576 sink_writes(ev_writer_sink(c->w), ".\n");
577 return 1; /* completed */
578}
579
580static int c_queue(struct conn *c,
581 char attribute((unused)) **vec,
582 int attribute((unused)) nvec) {
583 struct queue_entry *q;
584 time_t when = 0;
585 const char *l;
586 long length;
587
588 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
589 if(playing_is_enabled() && !paused) {
590 if(playing) {
591 queue_fix_sofar(playing);
592 if((l = trackdb_get(playing->track, "_length"))
593 && (length = atol(l))) {
594 time(&when);
595 when += length - playing->sofar + config->gap;
596 }
597 } else
598 /* Nothing is playing but playing is enabled, so whatever is
599 * first in the queue can be expected to start immediately. */
600 time(&when);
601 }
602 for(q = qhead.next; q != &qhead; q = q->next) {
603 /* fill in estimated start time */
604 q->expected = when;
605 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
606 /* update for next track */
607 if(when) {
608 if((l = trackdb_get(q->track, "_length"))
609 && (length = atol(l)))
610 when += length + config->gap;
611 else
612 when = 0;
613 }
614 }
615 sink_writes(ev_writer_sink(c->w), ".\n");
616 return 1; /* completed */
617}
618
619static int output_list(struct conn *c, char **vec) {
620 while(*vec)
621 sink_printf(ev_writer_sink(c->w), "%s\n", *vec++);
622 sink_writes(ev_writer_sink(c->w), ".\n");
623 return 1;
624}
625
626static int files_dirs(struct conn *c,
627 char **vec,
628 int nvec,
629 enum trackdb_listable what) {
630 const char *dir, *re, *errstr;
631 int erroffset;
632 pcre *rec;
633 char **fvec, *key;
634
635 switch(nvec) {
636 case 0: dir = 0; re = 0; break;
637 case 1: dir = vec[0]; re = 0; break;
638 case 2: dir = vec[0]; re = vec[1]; break;
639 default: abort();
640 }
641 /* A bit of a bodge to make sure the args don't trample on cache keys */
642 if(dir && strchr(dir, '\n')) {
643 sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n");
644 return 1;
645 }
646 if(re && strchr(re, '\n')) {
647 sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n");
648 return 1;
649 }
650 /* We bother eliminating "" because the web interface is relatively
651 * likely to send it */
652 if(re && *re) {
653 byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re);
654 fvec = (char **)cache_get(&cache_files_type, key);
655 if(fvec) {
656 /* Got a cache hit, don't store the answer in the cache */
657 key = 0;
658 ++cache_files_hits;
659 rec = 0; /* quieten compiler */
660 } else {
661 /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer
662 * in the cache. */
663 if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8,
664 &errstr, &erroffset, 0))) {
665 sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n",
666 errstr);
667 return 1;
668 }
669 /* It only counts as a miss if the regexp was valid. */
670 ++cache_files_misses;
671 }
672 } else {
673 /* No regexp, don't bother caching the result */
674 rec = 0;
675 key = 0;
676 fvec = 0;
677 }
678 if(!fvec) {
679 /* No cache hit (either because a miss, or because we did not look) so do
680 * the lookup */
681 if(dir && *dir)
682 fvec = trackdb_list(dir, 0, what, rec);
683 else
684 fvec = trackdb_list(0, 0, what, rec);
685 }
686 if(key)
687 /* Put the answer in the cache */
688 cache_put(&cache_files_type, key, fvec);
689 sink_writes(ev_writer_sink(c->w), "253 Listing follow\n");
690 return output_list(c, fvec);
691}
692
693static int c_files(struct conn *c,
694 char **vec,
695 int nvec) {
696 return files_dirs(c, vec, nvec, trackdb_files);
697}
698
699static int c_dirs(struct conn *c,
700 char **vec,
701 int nvec) {
702 return files_dirs(c, vec, nvec, trackdb_directories);
703}
704
705static int c_allfiles(struct conn *c,
706 char **vec,
707 int nvec) {
708 return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files);
709}
710
711static int c_get(struct conn *c,
712 char **vec,
713 int attribute((unused)) nvec) {
714 const char *v, *track;
715
716 if(!(track = trackdb_resolve(vec[0]))) {
717 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
718 return 1;
719 }
720 if(vec[1][0] != '_' && (v = trackdb_get(track, vec[1])))
721 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
722 else
723 sink_writes(ev_writer_sink(c->w), "555 not found\n");
724 return 1;
725}
726
727static int c_length(struct conn *c,
728 char **vec,
729 int attribute((unused)) nvec) {
730 const char *track, *v;
731
732 if(!(track = trackdb_resolve(vec[0]))) {
733 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
734 return 1;
735 }
736 if((v = trackdb_get(track, "_length")))
737 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
738 else
739 sink_writes(ev_writer_sink(c->w), "550 not found\n");
740 return 1;
741}
742
743static int c_set(struct conn *c,
744 char **vec,
745 int attribute((unused)) nvec) {
746 const char *track;
747
748 if(!(track = trackdb_resolve(vec[0]))) {
749 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
750 return 1;
751 }
752 if(vec[1][0] != '_' && !trackdb_set(track, vec[1], vec[2]))
753 sink_writes(ev_writer_sink(c->w), "250 OK\n");
754 else
755 sink_writes(ev_writer_sink(c->w), "550 not found\n");
756 return 1;
757}
758
759static int c_prefs(struct conn *c,
760 char **vec,
761 int attribute((unused)) nvec) {
762 struct kvp *k;
763 const char *track;
764
765 if(!(track = trackdb_resolve(vec[0]))) {
766 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
767 return 1;
768 }
769 k = trackdb_get_all(track);
770 sink_writes(ev_writer_sink(c->w), "253 prefs follow\n");
771 for(; k; k = k->next)
772 if(k->name[0] != '_') /* omit internal values */
773 sink_printf(ev_writer_sink(c->w),
774 " %s %s\n", quoteutf8(k->name), quoteutf8(k->value));
775 sink_writes(ev_writer_sink(c->w), ".\n");
776 return 1;
777}
778
779static int c_exists(struct conn *c,
780 char **vec,
781 int attribute((unused)) nvec) {
782 /* trackdb_exists() does its own alias checking */
783 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]);
784 return 1;
785}
786
787static void search_parse_error(const char *msg, void *u) {
788 *(const char **)u = msg;
789}
790
791static int c_search(struct conn *c,
792 char **vec,
793 int attribute((unused)) nvec) {
794 char **terms, **results;
795 int nterms, nresults, n;
796 const char *e = "unknown error";
797
798 /* This is a bit of a bodge. Initially it's there to make the eclient
799 * interface a bit more convenient to add searching to, but it has the more
800 * compelling advantage that if everything uses it, then interpretation of
801 * user-supplied search strings will be the same everywhere. */
802 if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) {
803 sink_printf(ev_writer_sink(c->w), "550 %s\n", e);
804 } else {
805 results = trackdb_search(terms, nterms, &nresults);
806 sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults);
807 for(n = 0; n < nresults; ++n)
808 sink_printf(ev_writer_sink(c->w), "%s\n", results[n]);
809 sink_writes(ev_writer_sink(c->w), ".\n");
810 }
811 return 1;
812}
813
814static int c_random_enable(struct conn *c,
815 char attribute((unused)) **vec,
816 int attribute((unused)) nvec) {
817 enable_random(c->who, c->ev);
818 /* Enable implicitly unpauses if there is nothing playing */
819 if(paused && !playing) resume_playing(c->who);
820 sink_writes(ev_writer_sink(c->w), "250 OK\n");
821 return 1; /* completed */
822}
823
824static int c_random_disable(struct conn *c,
825 char attribute((unused)) **vec,
826 int attribute((unused)) nvec) {
827 disable_random(c->who);
828 sink_writes(ev_writer_sink(c->w), "250 OK\n");
829 return 1; /* completed */
830}
831
832static int c_random_enabled(struct conn *c,
833 char attribute((unused)) **vec,
834 int attribute((unused)) nvec) {
835 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]);
836 return 1; /* completed */
837}
838
839static void got_stats(char *stats, void *u) {
840 struct conn *const c = u;
841
842 sink_printf(ev_writer_sink(c->w), "253 stats\n%s\n.\n", stats);
843 /* Now we can start processing commands again */
844 ev_reader_enable(c->r);
845}
846
847static int c_stats(struct conn *c,
848 char attribute((unused)) **vec,
849 int attribute((unused)) nvec) {
850 trackdb_stats_subprocess(c->ev, got_stats, c);
851 return 0; /* not yet complete */
852}
853
854static int c_volume(struct conn *c,
855 char **vec,
856 int nvec) {
857 int l, r, set;
858 char lb[32], rb[32];
859 rights_type rights;
860
861 switch(nvec) {
862 case 0:
863 set = 0;
864 break;
865 case 1:
866 l = r = atoi(vec[0]);
867 set = 1;
868 break;
869 case 2:
870 l = atoi(vec[0]);
871 r = atoi(vec[1]);
872 set = 1;
873 break;
874 default:
875 abort();
876 }
877 rights = set ? RIGHT_VOLUME : RIGHT_READ;
878 if(!(c->rights & rights)) {
879 error(0, "%s attempted to set volume but lacks required rights", c->who);
880 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
881 return 1;
882 }
883 if(mixer_control(-1/*as configured*/, &l, &r, set))
884 sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n");
885 else {
886 sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r);
887 if(l != volume_left || r != volume_right) {
888 volume_left = l;
889 volume_right = r;
890 snprintf(lb, sizeof lb, "%d", l);
891 snprintf(rb, sizeof rb, "%d", r);
892 eventlog("volume", lb, rb, (char *)0);
893 }
894 }
895 return 1;
896}
897
898/** @brief Called when data arrives on a log connection
899 *
900 * We just discard all such data. The client may occasionally send data as a
901 * keepalive.
902 */
903static int logging_reader_callback(ev_source attribute((unused)) *ev,
904 ev_reader *reader,
905 void attribute((unused)) *ptr,
906 size_t bytes,
907 int attribute((unused)) eof,
908 void attribute((unused)) *u) {
909 struct conn *c = u;
910
911 ev_reader_consume(reader, bytes);
912 if(eof) {
913 /* Oops, that's all for now */
914 D(("logging reader eof"));
915 if(c->w) {
916 D(("close writer"));
917 ev_writer_close(c->w);
918 c->w = 0;
919 }
920 c->r = 0;
921 remove_connection(c);
922 }
923 return 0;
924}
925
926static void logclient(const char *msg, void *user) {
927 struct conn *c = user;
928
929 if(!c->w || !c->r) {
930 /* This connection has gone up in smoke for some reason */
931 eventlog_remove(c->lo);
932 return;
933 }
934 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n",
935 (uintmax_t)time(0), msg);
936}
937
938static int c_log(struct conn *c,
939 char attribute((unused)) **vec,
940 int attribute((unused)) nvec) {
941 time_t now;
942
943 sink_writes(ev_writer_sink(c->w), "254 OK\n");
944 /* pump out initial state */
945 time(&now);
946 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
947 (uintmax_t)now,
948 playing_is_enabled() ? "enable_play" : "disable_play");
949 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
950 (uintmax_t)now,
951 random_is_enabled() ? "enable_random" : "disable_random");
952 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
953 (uintmax_t)now,
954 paused ? "pause" : "resume");
955 if(playing)
956 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state playing\n",
957 (uintmax_t)now);
958 /* Initial volume */
959 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" volume %d %d\n",
960 (uintmax_t)now, volume_left, volume_right);
961 c->lo = xmalloc(sizeof *c->lo);
962 c->lo->fn = logclient;
963 c->lo->user = c;
964 eventlog_add(c->lo);
965 c->reader = logging_reader_callback;
966 return 0;
967}
968
969/** @brief Test whether a move is allowed
970 * @param c Connection
971 * @param qs List of IDs on queue
972 * @param nqs Number of IDs
973 * @return 0 if move is prohibited, non-0 if it is allowed
974 */
975static int has_move_rights(struct conn *c, struct queue_entry **qs, int nqs) {
976 for(; nqs > 0; ++qs, --nqs) {
977 struct queue_entry *const q = *qs;
978
979 if(!right_movable(c->rights, c->who, q))
980 return 0;
981 }
982 return 1;
983}
984
985static int c_move(struct conn *c,
986 char **vec,
987 int attribute((unused)) nvec) {
988 struct queue_entry *q;
989 int n;
990
991 if(!(q = queue_find(vec[0]))) {
992 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
993 return 1;
994 }
995 if(!has_move_rights(c, &q, 1)) {
996 error(0, "%s attempted move but lacks required rights", c->who);
997 sink_writes(ev_writer_sink(c->w),
998 "510 Not authorized to move that track\n");
999 return 1;
1000 }
1001 n = queue_move(q, atoi(vec[1]), c->who);
1002 sink_printf(ev_writer_sink(c->w), "252 %d\n", n);
1003 /* If we've moved to the head of the queue then prepare the track. */
1004 if(q == qhead.next)
1005 prepare(c->ev, q);
1006 return 1;
1007}
1008
1009static int c_moveafter(struct conn *c,
1010 char **vec,
1011 int attribute((unused)) nvec) {
1012 struct queue_entry *q, **qs;
1013 int n;
1014
1015 if(vec[0][0]) {
1016 if(!(q = queue_find(vec[0]))) {
1017 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
1018 return 1;
1019 }
1020 } else
1021 q = 0;
1022 ++vec;
1023 --nvec;
1024 qs = xcalloc(nvec, sizeof *qs);
1025 for(n = 0; n < nvec; ++n)
1026 if(!(qs[n] = queue_find(vec[n]))) {
1027 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
1028 return 1;
1029 }
1030 if(!has_move_rights(c, qs, nvec)) {
1031 error(0, "%s attempted moveafter but lacks required rights", c->who);
1032 sink_writes(ev_writer_sink(c->w),
1033 "510 Not authorized to move those tracks\n");
1034 return 1;
1035 }
1036 queue_moveafter(q, nvec, qs, c->who);
1037 sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n");
1038 /* If we've moved to the head of the queue then prepare the track. */
1039 if(q == qhead.next)
1040 prepare(c->ev, q);
1041 return 1;
1042}
1043
1044static int c_part(struct conn *c,
1045 char **vec,
1046 int attribute((unused)) nvec) {
1047 const char *track;
1048
1049 if(!(track = trackdb_resolve(vec[0]))) {
1050 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
1051 return 1;
1052 }
1053 sink_printf(ev_writer_sink(c->w), "252 %s\n",
1054 quoteutf8(trackdb_getpart(track, vec[1], vec[2])));
1055 return 1;
1056}
1057
1058static int c_resolve(struct conn *c,
1059 char **vec,
1060 int attribute((unused)) nvec) {
1061 const char *track;
1062
1063 if(!(track = trackdb_resolve(vec[0]))) {
1064 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
1065 return 1;
1066 }
1067 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(track));
1068 return 1;
1069}
1070
1071static int c_tags(struct conn *c,
1072 char attribute((unused)) **vec,
1073 int attribute((unused)) nvec) {
1074 char **tags = trackdb_alltags();
1075
1076 sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n");
1077 while(*tags) {
1078 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1079 **tags == '.' ? "." : "", *tags);
1080 ++tags;
1081 }
1082 sink_writes(ev_writer_sink(c->w), ".\n");
1083 return 1; /* completed */
1084}
1085
1086static int c_set_global(struct conn *c,
1087 char **vec,
1088 int attribute((unused)) nvec) {
1089 if(vec[0][0] == '_') {
1090 sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n");
1091 return 1;
1092 }
1093 trackdb_set_global(vec[0], vec[1], c->who);
1094 sink_printf(ev_writer_sink(c->w), "250 OK\n");
1095 return 1;
1096}
1097
1098static int c_get_global(struct conn *c,
1099 char **vec,
1100 int attribute((unused)) nvec) {
1101 const char *s = trackdb_get_global(vec[0]);
1102
1103 if(s)
1104 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(s));
1105 else
1106 sink_writes(ev_writer_sink(c->w), "555 not found\n");
1107 return 1;
1108}
1109
1110static int c_nop(struct conn *c,
1111 char attribute((unused)) **vec,
1112 int attribute((unused)) nvec) {
1113 sink_printf(ev_writer_sink(c->w), "250 Quack\n");
1114 return 1;
1115}
1116
1117static int c_new(struct conn *c,
1118 char **vec,
1119 int nvec) {
1120 int max, n;
1121 char **tracks;
1122
1123 if(nvec > 0)
1124 max = atoi(vec[0]);
1125 else
1126 max = INT_MAX;
1127 if(max <= 0 || max > config->new_max)
1128 max = config->new_max;
1129 tracks = trackdb_new(0, max);
1130 sink_printf(ev_writer_sink(c->w), "253 New track list follows\n");
1131 n = 0;
1132 while(*tracks) {
1133 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1134 **tracks == '.' ? "." : "", *tracks);
1135 ++tracks;
1136 }
1137 sink_writes(ev_writer_sink(c->w), ".\n");
1138 return 1; /* completed */
1139
1140}
1141
1142static int c_rtp_address(struct conn *c,
1143 char attribute((unused)) **vec,
1144 int attribute((unused)) nvec) {
1145 if(config->api == BACKEND_NETWORK) {
1146 sink_printf(ev_writer_sink(c->w), "252 %s %s\n",
1147 quoteutf8(config->broadcast.s[0]),
1148 quoteutf8(config->broadcast.s[1]));
1149 } else
1150 sink_writes(ev_writer_sink(c->w), "550 No RTP\n");
1151 return 1;
1152}
1153
1154static int c_cookie(struct conn *c,
1155 char **vec,
1156 int attribute((unused)) nvec) {
1157 const char *host;
1158 char *user;
1159 rights_type rights;
1160
1161 /* Can't log in twice on the same connection */
1162 if(c->who) {
1163 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
1164 return 1;
1165 }
1166 /* Get some kind of peer identifcation */
1167 if(!(host = connection_host(c))) {
1168 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1169 return 1;
1170 }
1171 /* Check the cookie */
1172 user = verify_cookie(vec[0], &rights);
1173 if(!user) {
1174 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1175 return 1;
1176 }
1177 /* Log in */
1178 c->who = user;
1179 c->cookie = vec[0];
1180 c->rights = rights;
1181 if(strcmp(host, "local"))
1182 info("S%x %s connected with cookie from %s", c->tag, user, host);
1183 else
1184 c->rights |= RIGHT__LOCAL;
1185 /* Response contains username so client knows who they are acting as */
1186 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
1187 return 1;
1188}
1189
1190static int c_make_cookie(struct conn *c,
1191 char attribute((unused)) **vec,
1192 int attribute((unused)) nvec) {
1193 const char *cookie = make_cookie(c->who);
1194
1195 if(cookie)
1196 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cookie));
1197 else
1198 sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n");
1199 return 1;
1200}
1201
1202static int c_revoke(struct conn *c,
1203 char attribute((unused)) **vec,
1204 int attribute((unused)) nvec) {
1205 if(c->cookie) {
1206 revoke_cookie(c->cookie);
1207 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1208 } else
1209 sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n");
1210 return 1;
1211}
1212
1213static int c_adduser(struct conn *c,
1214 char **vec,
1215 int nvec) {
1216 const char *rights;
1217
1218 if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) {
1219 error(0, "S%x: remote adduser", c->tag);
1220 sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n");
1221 return 1;
1222 }
1223 if(nvec > 2) {
1224 rights = vec[2];
1225 if(parse_rights(vec[2], 0, 1)) {
1226 sink_writes(ev_writer_sink(c->w), "550 Invalid rights list\n");
1227 return -1;
1228 }
1229 } else
1230 rights = config->default_rights;
1231 if(trackdb_adduser(vec[0], vec[1], rights,
1232 0/*email*/, 0/*confirmation*/))
1233 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1234 else
1235 sink_writes(ev_writer_sink(c->w), "250 User created\n");
1236 return 1;
1237}
1238
1239static int c_deluser(struct conn *c,
1240 char **vec,
1241 int attribute((unused)) nvec) {
1242 struct conn *d;
1243
1244 if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) {
1245 error(0, "S%x: remote deluser", c->tag);
1246 sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n");
1247 return 1;
1248 }
1249 if(trackdb_deluser(vec[0])) {
1250 sink_writes(ev_writer_sink(c->w), "550 Cannot delete user\n");
1251 return 1;
1252 }
1253 /* Zap connections belonging to deleted user */
1254 for(d = connections; d; d = d->next)
1255 if(!strcmp(d->who, vec[0]))
1256 d->rights = 0;
1257 sink_writes(ev_writer_sink(c->w), "250 User deleted\n");
1258 return 1;
1259}
1260
1261static int c_edituser(struct conn *c,
1262 char **vec,
1263 int attribute((unused)) nvec) {
1264 struct conn *d;
1265
1266 if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) {
1267 error(0, "S%x: remote edituser", c->tag);
1268 sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n");
1269 return 1;
1270 }
1271 /* RIGHT_ADMIN can do anything; otherwise you can only set your own email
1272 * address and password. */
1273 if((c->rights & RIGHT_ADMIN)
1274 || (!strcmp(c->who, vec[0])
1275 && (!strcmp(vec[1], "email")
1276 || !strcmp(vec[1], "password")))) {
1277 if(trackdb_edituserinfo(vec[0], vec[1], vec[2])) {
1278 sink_writes(ev_writer_sink(c->w), "550 Failed to change setting\n");
1279 return 1;
1280 }
1281 if(!strcmp(vec[1], "password")) {
1282 /* Zap all connections for this user after a password change */
1283 for(d = connections; d; d = d->next)
1284 if(!strcmp(d->who, vec[0]))
1285 d->rights = 0;
1286 } else if(!strcmp(vec[1], "rights")) {
1287 /* Update rights for this user */
1288 rights_type r;
1289
1290 if(parse_rights(vec[2], &r, 1))
1291 for(d = connections; d; d = d->next)
1292 if(!strcmp(d->who, vec[0]))
1293 d->rights = r;
1294 }
1295 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1296 } else {
1297 error(0, "%s attempted edituser but lacks required rights", c->who);
1298 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
1299 }
1300 return 1;
1301}
1302
1303static int c_userinfo(struct conn *c,
1304 char attribute((unused)) **vec,
1305 int attribute((unused)) nvec) {
1306 struct kvp *k;
1307 const char *value;
1308
1309 /* We allow remote querying of rights so that clients can figure out what
1310 * they're allowed to do */
1311 if(!config->remote_userman
1312 && !(c->rights & RIGHT__LOCAL)
1313 && strcmp(vec[1], "rights")) {
1314 error(0, "S%x: remote userinfo %s %s", c->tag, vec[0], vec[1]);
1315 sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n");
1316 return 1;
1317 }
1318 /* RIGHT_ADMIN allows anything; otherwise you can only get your own email
1319 * address and rights list. */
1320 if((c->rights & RIGHT_ADMIN)
1321 || (!strcmp(c->who, vec[0])
1322 && (!strcmp(vec[1], "email")
1323 || !strcmp(vec[1], "rights")))) {
1324 if((k = trackdb_getuserinfo(vec[0])))
1325 if((value = kvp_get(k, vec[1])))
1326 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(value));
1327 else
1328 sink_writes(ev_writer_sink(c->w), "555 Not set\n");
1329 else
1330 sink_writes(ev_writer_sink(c->w), "550 No such user\n");
1331 } else {
1332 error(0, "%s attempted userinfo but lacks required rights", c->who);
1333 sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n");
1334 }
1335 return 1;
1336}
1337
1338static int c_users(struct conn *c,
1339 char attribute((unused)) **vec,
1340 int attribute((unused)) nvec) {
1341 /* TODO de-dupe with c_tags */
1342 char **users = trackdb_listusers();
1343
1344 sink_writes(ev_writer_sink(c->w), "253 User list follows\n");
1345 while(*users) {
1346 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1347 **users == '.' ? "." : "", *users);
1348 ++users;
1349 }
1350 sink_writes(ev_writer_sink(c->w), ".\n");
1351 return 1; /* completed */
1352}
1353
1354/** @brief Base64 mapping table for confirmation strings
1355 *
1356 * This is used with generic_to_base64() and generic_base64(). We cannot use
1357 * the MIME table as that contains '+' and '=' which get quoted when
1358 * URL-encoding. (The CGI still does the URL encoding but it is desirable to
1359 * avoid it being necessary.)
1360 */
1361static const char confirm_base64_table[] =
1362 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/.*";
1363
1364static int c_register(struct conn *c,
1365 char **vec,
1366 int attribute((unused)) nvec) {
1367 char *buf, *cs;
1368 size_t bufsize;
1369 int offset;
1370
1371 /* The confirmation string is base64(username;nonce) */
1372 bufsize = strlen(vec[0]) + CONFIRM_SIZE + 2;
1373 buf = xmalloc_noptr(bufsize);
1374 offset = byte_snprintf(buf, bufsize, "%s;", vec[0]);
1375 gcry_randomize(buf + offset, CONFIRM_SIZE, GCRY_STRONG_RANDOM);
1376 cs = generic_to_base64((uint8_t *)buf, offset + CONFIRM_SIZE,
1377 confirm_base64_table);
1378 if(trackdb_adduser(vec[0], vec[1], config->default_rights, vec[2], cs))
1379 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1380 else
1381 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cs));
1382 return 1;
1383}
1384
1385static int c_confirm(struct conn *c,
1386 char **vec,
1387 int attribute((unused)) nvec) {
1388 size_t nuser;
1389 char *user, *sep;
1390 rights_type rights;
1391 const char *host;
1392
1393 /* Get some kind of peer identifcation */
1394 if(!(host = connection_host(c))) {
1395 sink_writes(ev_writer_sink(c->w), "530 Authentication failure\n");
1396 return 1;
1397 }
1398 if(!(user = generic_base64(vec[0], &nuser, confirm_base64_table))
1399 || !(sep = memchr(user, ';', nuser))) {
1400 sink_writes(ev_writer_sink(c->w), "550 Malformed confirmation string\n");
1401 return 1;
1402 }
1403 *sep = 0;
1404 if(trackdb_confirm(user, vec[0], &rights))
1405 sink_writes(ev_writer_sink(c->w), "550 Incorrect confirmation string\n");
1406 else {
1407 c->who = user;
1408 c->cookie = 0;
1409 c->rights = rights;
1410 if(strcmp(host, "local"))
1411 info("S%x %s confirmed from %s", c->tag, user, host);
1412 else
1413 c->rights |= RIGHT__LOCAL;
1414 /* Response contains username so client knows who they are acting as */
1415 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
1416 }
1417 return 1;
1418}
1419
1420static int sent_reminder(ev_source attribute((unused)) *ev,
1421 pid_t attribute((unused)) pid,
1422 int status,
1423 const struct rusage attribute((unused)) *rusage,
1424 void *u) {
1425 struct conn *const c = u;
1426
1427 /* Tell the client what went down */
1428 if(!status) {
1429 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1430 } else {
1431 error(0, "reminder subprocess %s", wstat(status));
1432 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1433 }
1434 /* Re-enable this connection */
1435 ev_reader_enable(c->r);
1436 return 0;
1437}
1438
1439static int c_reminder(struct conn *c,
1440 char **vec,
1441 int attribute((unused)) nvec) {
1442 struct kvp *k;
1443 const char *password, *email, *text, *encoding, *charset, *content_type;
1444 const time_t *last;
1445 time_t now;
1446 pid_t pid;
1447
1448 static hash *last_reminder;
1449
1450 if(!config->mail_sender) {
1451 error(0, "cannot send password reminders because mail_sender not set");
1452 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1453 return 1;
1454 }
1455 if(!(k = trackdb_getuserinfo(vec[0]))) {
1456 error(0, "reminder for user '%s' who does not exist", vec[0]);
1457 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1458 return 1;
1459 }
1460 if(!(email = kvp_get(k, "email"))
1461 || !strchr(email, '@')) {
1462 error(0, "user '%s' has no valid email address", vec[0]);
1463 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1464 return 1;
1465 }
1466 if(!(password = kvp_get(k, "password"))
1467 || !*password) {
1468 error(0, "user '%s' has no password", vec[0]);
1469 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1470 return 1;
1471 }
1472 /* Rate-limit reminders. This hash is bounded in size by the number of
1473 * users. If this is actually a problem for anyone then we can periodically
1474 * clean it. */
1475 if(!last_reminder)
1476 last_reminder = hash_new(sizeof (time_t));
1477 last = hash_find(last_reminder, vec[0]);
1478 time(&now);
1479 if(last && now < *last + config->reminder_interval) {
1480 error(0, "sent a password reminder to '%s' too recently", vec[0]);
1481 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1482 return 1;
1483 }
1484 /* Send the reminder */
1485 /* TODO this should be templatized and to some extent merged with
1486 * the code in act_register() */
1487 byte_xasprintf((char **)&text,
1488"Someone requested that you be sent a reminder of your DisOrder password.\n"
1489"Your password is:\n"
1490"\n"
1491" %s\n", password);
1492 if(!(text = mime_encode_text(text, &charset, &encoding)))
1493 fatal(0, "cannot encode email");
1494 byte_xasprintf((char **)&content_type, "text/plain;charset=%s",
1495 quote822(charset, 0));
1496 pid = sendmail_subprocess("", config->mail_sender, email,
1497 "DisOrder password reminder",
1498 encoding, content_type, text);
1499 if(pid < 0) {
1500 sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n");
1501 return 1;
1502 }
1503 hash_add(last_reminder, vec[0], &now, HASH_INSERT_OR_REPLACE);
1504 info("sending a passsword reminder to user '%s'", vec[0]);
1505 /* We can only continue when the subprocess finishes */
1506 ev_child(c->ev, pid, 0, sent_reminder, c);
1507 return 0;
1508}
1509
1510static int c_schedule_list(struct conn *c,
1511 char attribute((unused)) **vec,
1512 int attribute((unused)) nvec) {
1513 char **ids = schedule_list(0);
1514 sink_writes(ev_writer_sink(c->w), "253 ID list follows\n");
1515 while(*ids)
1516 sink_printf(ev_writer_sink(c->w), "%s\n", *ids++);
1517 sink_writes(ev_writer_sink(c->w), ".\n");
1518 return 1; /* completed */
1519}
1520
1521static int c_schedule_get(struct conn *c,
1522 char **vec,
1523 int attribute((unused)) nvec) {
1524 struct kvp *actiondata = schedule_get(vec[0]), *k;
1525
1526 if(!actiondata) {
1527 sink_writes(ev_writer_sink(c->w), "555 No such event\n");
1528 return 1; /* completed */
1529 }
1530 /* Scheduled events are public information. Anyone with RIGHT_READ can see
1531 * them. */
1532 sink_writes(ev_writer_sink(c->w), "253 Event information follows\n");
1533 for(k = actiondata; k; k = k->next)
1534 sink_printf(ev_writer_sink(c->w), " %s %s\n",
1535 quoteutf8(k->name), quoteutf8(k->value));
1536 sink_writes(ev_writer_sink(c->w), ".\n");
1537 return 1; /* completed */
1538}
1539
1540static int c_schedule_del(struct conn *c,
1541 char **vec,
1542 int attribute((unused)) nvec) {
1543 struct kvp *actiondata = schedule_get(vec[0]);
1544
1545 if(!actiondata) {
1546 sink_writes(ev_writer_sink(c->w), "555 No such event\n");
1547 return 1; /* completed */
1548 }
1549 /* If you have admin rights you can delete anything. If you don't then you
1550 * can only delete your own scheduled events. */
1551 if(!(c->rights & RIGHT_ADMIN)) {
1552 const char *who = kvp_get(actiondata, "who");
1553
1554 if(!who || !c->who || strcmp(who, c->who)) {
1555 sink_writes(ev_writer_sink(c->w), "551 Not authorized\n");
1556 return 1; /* completed */
1557 }
1558 }
1559 if(schedule_del(vec[0]))
1560 sink_writes(ev_writer_sink(c->w), "550 Could not delete scheduled event\n");
1561 else
1562 sink_writes(ev_writer_sink(c->w), "250 Deleted\n");
1563 return 1; /* completed */
1564}
1565
1566static int c_schedule_add(struct conn *c,
1567 char **vec,
1568 int nvec) {
1569 struct kvp *actiondata = 0;
1570 char *id;
1571
1572 /* Standard fields */
1573 kvp_set(&actiondata, "who", c->who);
1574 kvp_set(&actiondata, "when", vec[0]);
1575 kvp_set(&actiondata, "priority", vec[1]);
1576 kvp_set(&actiondata, "action", vec[2]);
1577 /* Action-dependent fields */
1578 if(!strcmp(vec[2], "play")) {
1579 if(nvec != 4) {
1580 sink_writes(ev_writer_sink(c->w), "550 Wrong number of arguments\n");
1581 return 1;
1582 }
1583 if(!trackdb_exists(vec[3])) {
1584 sink_writes(ev_writer_sink(c->w), "550 Track is not in database\n");
1585 return 1;
1586 }
1587 kvp_set(&actiondata, "track", vec[3]);
1588 } else if(!strcmp(vec[2], "set-global")) {
1589 if(nvec < 4 || nvec > 5) {
1590 sink_writes(ev_writer_sink(c->w), "550 Wrong number of arguments\n");
1591 return 1;
1592 }
1593 kvp_set(&actiondata, "key", vec[3]);
1594 if(nvec > 4)
1595 kvp_set(&actiondata, "value", vec[4]);
1596 } else {
1597 sink_writes(ev_writer_sink(c->w), "550 Unknown action\n");
1598 return 1;
1599 }
1600 /* schedule_add() checks user rights */
1601 id = schedule_add(c->ev, actiondata);
1602 if(!id)
1603 sink_writes(ev_writer_sink(c->w), "550 Cannot add scheduled event\n");
1604 else
1605 sink_printf(ev_writer_sink(c->w), "252 %s\n", id);
1606 return 1;
1607}
1608
1609static const struct command {
1610 /** @brief Command name */
1611 const char *name;
1612
1613 /** @brief Minimum number of arguments */
1614 int minargs;
1615
1616 /** @brief Maximum number of arguments */
1617 int maxargs;
1618
1619 /** @brief Function to process command */
1620 int (*fn)(struct conn *, char **, int);
1621
1622 /** @brief Rights required to execute command
1623 *
1624 * 0 means that the command can be issued without logging in. If multiple
1625 * bits are listed here any of those rights will do.
1626 */
1627 rights_type rights;
1628} commands[] = {
1629 { "adduser", 2, 3, c_adduser, RIGHT_ADMIN|RIGHT__LOCAL },
1630 { "allfiles", 0, 2, c_allfiles, RIGHT_READ },
1631 { "confirm", 1, 1, c_confirm, 0 },
1632 { "cookie", 1, 1, c_cookie, 0 },
1633 { "deluser", 1, 1, c_deluser, RIGHT_ADMIN|RIGHT__LOCAL },
1634 { "dirs", 0, 2, c_dirs, RIGHT_READ },
1635 { "disable", 0, 1, c_disable, RIGHT_GLOBAL_PREFS },
1636 { "edituser", 3, 3, c_edituser, RIGHT_ADMIN|RIGHT_USERINFO },
1637 { "enable", 0, 0, c_enable, RIGHT_GLOBAL_PREFS },
1638 { "enabled", 0, 0, c_enabled, RIGHT_READ },
1639 { "exists", 1, 1, c_exists, RIGHT_READ },
1640 { "files", 0, 2, c_files, RIGHT_READ },
1641 { "get", 2, 2, c_get, RIGHT_READ },
1642 { "get-global", 1, 1, c_get_global, RIGHT_READ },
1643 { "length", 1, 1, c_length, RIGHT_READ },
1644 { "log", 0, 0, c_log, RIGHT_READ },
1645 { "make-cookie", 0, 0, c_make_cookie, RIGHT_READ },
1646 { "move", 2, 2, c_move, RIGHT_MOVE__MASK },
1647 { "moveafter", 1, INT_MAX, c_moveafter, RIGHT_MOVE__MASK },
1648 { "new", 0, 1, c_new, RIGHT_READ },
1649 { "nop", 0, 0, c_nop, 0 },
1650 { "part", 3, 3, c_part, RIGHT_READ },
1651 { "pause", 0, 0, c_pause, RIGHT_PAUSE },
1652 { "play", 1, 1, c_play, RIGHT_PLAY },
1653 { "playing", 0, 0, c_playing, RIGHT_READ },
1654 { "prefs", 1, 1, c_prefs, RIGHT_READ },
1655 { "queue", 0, 0, c_queue, RIGHT_READ },
1656 { "random-disable", 0, 0, c_random_disable, RIGHT_GLOBAL_PREFS },
1657 { "random-enable", 0, 0, c_random_enable, RIGHT_GLOBAL_PREFS },
1658 { "random-enabled", 0, 0, c_random_enabled, RIGHT_READ },
1659 { "recent", 0, 0, c_recent, RIGHT_READ },
1660 { "reconfigure", 0, 0, c_reconfigure, RIGHT_ADMIN },
1661 { "register", 3, 3, c_register, RIGHT_REGISTER|RIGHT__LOCAL },
1662 { "reminder", 1, 1, c_reminder, RIGHT__LOCAL },
1663 { "remove", 1, 1, c_remove, RIGHT_REMOVE__MASK },
1664 { "rescan", 0, INT_MAX, c_rescan, RIGHT_RESCAN },
1665 { "resolve", 1, 1, c_resolve, RIGHT_READ },
1666 { "resume", 0, 0, c_resume, RIGHT_PAUSE },
1667 { "revoke", 0, 0, c_revoke, RIGHT_READ },
1668 { "rtp-address", 0, 0, c_rtp_address, 0 },
1669 { "schedule-add", 3, INT_MAX, c_schedule_add, RIGHT_READ },
1670 { "schedule-del", 1, 1, c_schedule_del, RIGHT_READ },
1671 { "schedule-get", 1, 1, c_schedule_get, RIGHT_READ },
1672 { "schedule-list", 0, 0, c_schedule_list, RIGHT_READ },
1673 { "scratch", 0, 1, c_scratch, RIGHT_SCRATCH__MASK },
1674 { "search", 1, 1, c_search, RIGHT_READ },
1675 { "set", 3, 3, c_set, RIGHT_PREFS, },
1676 { "set-global", 2, 2, c_set_global, RIGHT_GLOBAL_PREFS },
1677 { "shutdown", 0, 0, c_shutdown, RIGHT_ADMIN },
1678 { "stats", 0, 0, c_stats, RIGHT_READ },
1679 { "tags", 0, 0, c_tags, RIGHT_READ },
1680 { "unset", 2, 2, c_set, RIGHT_PREFS },
1681 { "unset-global", 1, 1, c_set_global, RIGHT_GLOBAL_PREFS },
1682 { "user", 2, 2, c_user, 0 },
1683 { "userinfo", 2, 2, c_userinfo, RIGHT_READ },
1684 { "users", 0, 0, c_users, RIGHT_READ },
1685 { "version", 0, 0, c_version, RIGHT_READ },
1686 { "volume", 0, 2, c_volume, RIGHT_READ|RIGHT_VOLUME }
1687};
1688
1689static void command_error(const char *msg, void *u) {
1690 struct conn *c = u;
1691
1692 sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg);
1693}
1694
1695/* process a command. Return 1 if complete, 0 if incomplete. */
1696static int command(struct conn *c, char *line) {
1697 char **vec;
1698 int nvec, n;
1699
1700 D(("server command %s", line));
1701 /* We force everything into NFC as early as possible */
1702 if(!(line = utf8_compose_canon(line, strlen(line), 0))) {
1703 sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n");
1704 return 1;
1705 }
1706 if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) {
1707 sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n");
1708 return 1;
1709 }
1710 if(nvec == 0) {
1711 sink_writes(ev_writer_sink(c->w), "500 do what?\n");
1712 return 1;
1713 }
1714 if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0)
1715 sink_writes(ev_writer_sink(c->w), "500 unknown command\n");
1716 else {
1717 if(commands[n].rights
1718 && !(c->rights & commands[n].rights)) {
1719 error(0, "%s attempted %s but lacks required rights", c->who ? c->who : "NULL",
1720 commands[n].name);
1721 sink_writes(ev_writer_sink(c->w), "510 Prohibited\n");
1722 return 1;
1723 }
1724 ++vec;
1725 --nvec;
1726 if(nvec < commands[n].minargs) {
1727 sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n");
1728 return 1;
1729 }
1730 if(nvec > commands[n].maxargs) {
1731 sink_writes(ev_writer_sink(c->w), "500 too many arguments\n");
1732 return 1;
1733 }
1734 return commands[n].fn(c, vec, nvec);
1735 }
1736 return 1; /* completed */
1737}
1738
1739/* redirect to the right reader callback for our current state */
1740static int redirect_reader_callback(ev_source *ev,
1741 ev_reader *reader,
1742 void *ptr,
1743 size_t bytes,
1744 int eof,
1745 void *u) {
1746 struct conn *c = u;
1747
1748 return c->reader(ev, reader, ptr, bytes, eof, u);
1749}
1750
1751/* the main command reader */
1752static int reader_callback(ev_source attribute((unused)) *ev,
1753 ev_reader *reader,
1754 void *ptr,
1755 size_t bytes,
1756 int eof,
1757 void *u) {
1758 struct conn *c = u;
1759 char *eol;
1760 int complete;
1761
1762 D(("server reader_callback"));
1763 while((eol = memchr(ptr, '\n', bytes))) {
1764 *eol++ = 0;
1765 ev_reader_consume(reader, eol - (char *)ptr);
1766 complete = command(c, ptr);
1767 bytes -= (eol - (char *)ptr);
1768 ptr = eol;
1769 if(!complete) {
1770 /* the command had better have set a new reader callback */
1771 if(bytes || eof)
1772 /* there are further bytes to read, or we are at eof; arrange for the
1773 * command's reader callback to handle them */
1774 return ev_reader_incomplete(reader);
1775 /* nothing's going on right now */
1776 return 0;
1777 }
1778 /* command completed, we can go around and handle the next one */
1779 }
1780 if(eof) {
1781 if(bytes)
1782 error(0, "S%x unterminated line", c->tag);
1783 D(("normal reader close"));
1784 c->r = 0;
1785 if(c->w) {
1786 D(("close associated writer"));
1787 ev_writer_close(c->w);
1788 c->w = 0;
1789 }
1790 remove_connection(c);
1791 }
1792 return 0;
1793}
1794
1795static int listen_callback(ev_source *ev,
1796 int fd,
1797 const struct sockaddr attribute((unused)) *remote,
1798 socklen_t attribute((unused)) rlen,
1799 void *u) {
1800 const struct listener *l = u;
1801 struct conn *c = xmalloc(sizeof *c);
1802 static unsigned tags;
1803
1804 D(("server listen_callback fd %d (%s)", fd, l->name));
1805 nonblock(fd);
1806 cloexec(fd);
1807 c->tag = tags++;
1808 c->ev = ev;
1809 c->w = ev_writer_new(ev, fd, writer_error, c,
1810 "client writer");
1811 c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c,
1812 "client reader");
1813 ev_tie(c->r, c->w);
1814 c->fd = fd;
1815 c->reader = reader_callback;
1816 c->l = l;
1817 c->rights = 0;
1818 gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM);
1819 sink_printf(ev_writer_sink(c->w), "231 %d %s %s\n",
1820 2,
1821 config->authorization_algorithm,
1822 hex(c->nonce, sizeof c->nonce));
1823 return 0;
1824}
1825
1826int server_start(ev_source *ev, int pf,
1827 size_t socklen, const struct sockaddr *sa,
1828 const char *name) {
1829 int fd;
1830 struct listener *l = xmalloc(sizeof *l);
1831 static const int one = 1;
1832
1833 D(("server_init socket %s", name));
1834 fd = xsocket(pf, SOCK_STREAM, 0);
1835 xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
1836 if(bind(fd, sa, socklen) < 0) {
1837 error(errno, "error binding to %s", name);
1838 return -1;
1839 }
1840 xlisten(fd, 128);
1841 nonblock(fd);
1842 cloexec(fd);
1843 l->name = name;
1844 l->pf = pf;
1845 if(ev_listen(ev, fd, listen_callback, l, "server listener"))
1846 exit(EXIT_FAILURE);
1847 return fd;
1848}
1849
1850int server_stop(ev_source *ev, int fd) {
1851 xclose(fd);
1852 return ev_listen_cancel(ev, fd);
1853}
1854
1855/*
1856Local Variables:
1857c-basic-offset:2
1858comment-column:40
1859fill-column:79
1860End:
1861*/