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create users.db (but don't do anythin with it). tighter db permissions
[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"
54#include "trackdb.h"
55#include "table.h"
56#include "kvp.h"
57#include "mixer.h"
58#include "sink.h"
59#include "authhash.h"
60#include "plugin.h"
61#include "printf.h"
62#include "trackname.h"
63#include "eventlog.h"
64#include "defs.h"
65#include "cache.h"
f9635e06 66#include "unicode.h"
b12be54a 67#include "cookies.h"
460b9539 68
69#ifndef NONCE_SIZE
70# define NONCE_SIZE 16
71#endif
72
73int volume_left, volume_right; /* last known volume */
74
18e6d6e6 75/** @brief Accept all well-formed login attempts
76 *
77 * Used in debugging.
78 */
79int wideopen;
80
460b9539 81struct listener {
82 const char *name;
83 int pf;
84};
85
397ef7bb 86/** @brief One client connection */
460b9539 87struct conn {
397ef7bb 88 /** @brief Read commands from here */
460b9539 89 ev_reader *r;
397ef7bb 90 /** @brief Send responses to here */
460b9539 91 ev_writer *w;
397ef7bb 92 /** @brief Underlying file descriptor */
460b9539 93 int fd;
397ef7bb 94 /** @brief Unique identifier for connection used in log messages */
460b9539 95 unsigned tag;
397ef7bb 96 /** @brief Login name or NULL */
460b9539 97 char *who;
397ef7bb 98 /** @brief Event loop */
460b9539 99 ev_source *ev;
397ef7bb 100 /** @brief Nonce chosen for this connection */
460b9539 101 unsigned char nonce[NONCE_SIZE];
397ef7bb
RK		 102 /** @brief Current reader callback
103 *
104 * We change this depending on whether we're servicing the @b log command
105 */
460b9539 106 ev_reader_callback *reader;
397ef7bb 107 /** @brief Event log output sending to this connection */
460b9539 108 struct eventlog_output *lo;
397ef7bb 109 /** @brief Parent listener */
460b9539 110 const struct listener *l;
b12be54a
RK		 111 /** @brief Login cookie or NULL */
112 char *cookie;
460b9539 113};
114
115static int reader_callback(ev_source *ev,
116 ev_reader *reader,
460b9539 117 void *ptr,
118 size_t bytes,
119 int eof,
120 void *u);
121
122static const char *noyes[] = { "no", "yes" };
123
397ef7bb
RK		 124/** @brief Called when a connection's writer fails or is shut down
125 *
126 * If the connection still has a raeder that is cancelled.
127 */
460b9539 128static int writer_error(ev_source attribute((unused)) *ev,
460b9539 129 int errno_value,
130 void *u) {
131 struct conn *c = u;
132
8d8b8c1f 133 D(("server writer_error S%x %d", c->tag, errno_value));
460b9539 134 if(errno_value == 0) {
135 /* writer is done */
8d8b8c1f 136 D(("S%x writer completed", c->tag));
460b9539 137 } else {
138 if(errno_value != EPIPE)
139 error(errno_value, "S%x write error on socket", c->tag);
38b8221f 140 if(c->r) {
8d8b8c1f 141 D(("cancel reader"));
38b8221f
RK		 142 ev_reader_cancel(c->r);
143 c->r = 0;
144 }
8d8b8c1f 145 D(("done cancel reader"));
460b9539 146 }
38b8221f 147 c->w = 0;
75d64210 148 ev_report(ev);
460b9539 149 return 0;
150}
151
397ef7bb
RK		 152/** @brief Called when a conncetion's reader fails or is shut down
153 *
154 * If connection still has a writer then it is closed.
155 */
460b9539 156static int reader_error(ev_source attribute((unused)) *ev,
460b9539 157 int errno_value,
158 void *u) {
159 struct conn *c = u;
160
8d8b8c1f 161 D(("server reader_error S%x %d", c->tag, errno_value));
1563f6f6 162 error(errno_value, "S%x read error on socket", c->tag);
38b8221f
RK		 163 if(c->w)
164 ev_writer_close(c->w);
165 c->w = 0;
166 c->r = 0;
768d7355 167 ev_report(ev);
460b9539 168 return 0;
169}
170
397ef7bb 171/** @brief Return true if we are talking to a trusted user */
460b9539 172static int trusted(struct conn *c) {
173 int n;
174
175 for(n = 0; (n < config->trust.n
176 && strcmp(config->trust.s[n], c->who)); ++n)
177 ;
178 return n < config->trust.n;
179}
180
181static int c_disable(struct conn *c, char **vec, int nvec) {
182 if(nvec == 0)
183 disable_playing(c->who);
184 else if(nvec == 1 && !strcmp(vec[0], "now"))
185 disable_playing(c->who);
186 else {
187 sink_writes(ev_writer_sink(c->w), "550 invalid argument\n");
188 return 1; /* completed */
189 }
190 sink_writes(ev_writer_sink(c->w), "250 OK\n");
191 return 1; /* completed */
192}
193
194static int c_enable(struct conn *c,
195 char attribute((unused)) **vec,
196 int attribute((unused)) nvec) {
197 enable_playing(c->who, c->ev);
198 /* Enable implicitly unpauses if there is nothing playing */
199 if(paused && !playing) resume_playing(c->who);
200 sink_writes(ev_writer_sink(c->w), "250 OK\n");
201 return 1; /* completed */
202}
203
204static int c_enabled(struct conn *c,
205 char attribute((unused)) **vec,
206 int attribute((unused)) nvec) {
207 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]);
208 return 1; /* completed */
209}
210
211static int c_play(struct conn *c, char **vec,
212 int attribute((unused)) nvec) {
213 const char *track;
214 struct queue_entry *q;
215
216 if(!trackdb_exists(vec[0])) {
217 sink_writes(ev_writer_sink(c->w), "550 track is not in database\n");
218 return 1;
219 }
220 if(!(track = trackdb_resolve(vec[0]))) {
221 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
222 return 1;
223 }
224 q = queue_add(track, c->who, WHERE_BEFORE_RANDOM);
225 queue_write();
226 /* If we added the first track, and something is playing, then prepare the
227 * new track. If nothing is playing then we don't bother as it wouldn't gain
228 * anything. */
229 if(q == qhead.next && playing)
230 prepare(c->ev, q);
81e440ce 231 sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id);
460b9539 232 /* If the queue was empty but we are for some reason paused then
233 * unpause. */
234 if(!playing) resume_playing(0);
235 play(c->ev);
236 return 1; /* completed */
237}
238
239static int c_remove(struct conn *c, char **vec,
240 int attribute((unused)) nvec) {
241 struct queue_entry *q;
242
243 if(!(q = queue_find(vec[0]))) {
244 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
245 return 1;
246 }
247 if(config->restrictions & RESTRICT_REMOVE) {
248 /* can only remove tracks that you submitted */
249 if(!q->submitter || strcmp(q->submitter, c->who)) {
250 sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n");
251 return 1;
252 }
253 }
254 queue_remove(q, c->who);
255 /* De-prepare the track. */
256 abandon(c->ev, q);
257 /* If we removed the random track then add another one. */
258 if(q->state == playing_random)
259 add_random_track();
260 /* Prepare whatever the next head track is. */
261 if(qhead.next != &qhead)
262 prepare(c->ev, qhead.next);
263 queue_write();
264 sink_writes(ev_writer_sink(c->w), "250 removed\n");
265 return 1; /* completed */
266}
267
268static int c_scratch(struct conn *c,
269 char **vec,
270 int nvec) {
271 if(!playing) {
272 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
273 return 1; /* completed */
274 }
275 if(config->restrictions & RESTRICT_SCRATCH) {
276 /* can only scratch tracks you submitted and randomly selected ones */
277 if(playing->submitter && strcmp(playing->submitter, c->who)) {
278 sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n");
279 return 1;
280 }
281 }
282 scratch(c->who, nvec == 1 ? vec[0] : 0);
283 /* If you scratch an unpaused track then it is automatically unpaused */
284 resume_playing(0);
285 sink_writes(ev_writer_sink(c->w), "250 scratched\n");
286 return 1; /* completed */
287}
288
289static int c_pause(struct conn *c,
290 char attribute((unused)) **vec,
291 int attribute((unused)) nvec) {
292 if(!playing) {
293 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
294 return 1; /* completed */
295 }
296 if(paused) {
297 sink_writes(ev_writer_sink(c->w), "250 already paused\n");
298 return 1; /* completed */
299 }
300 if(pause_playing(c->who) < 0)
301 sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n");
302 else
303 sink_writes(ev_writer_sink(c->w), "250 paused\n");
304 return 1;
305}
306
307static int c_resume(struct conn *c,
308 char attribute((unused)) **vec,
309 int attribute((unused)) nvec) {
310 if(!paused) {
311 sink_writes(ev_writer_sink(c->w), "250 not paused\n");
312 return 1; /* completed */
313 }
314 resume_playing(c->who);
315 sink_writes(ev_writer_sink(c->w), "250 paused\n");
316 return 1;
317}
318
319static int c_shutdown(struct conn *c,
320 char attribute((unused)) **vec,
321 int attribute((unused)) nvec) {
322 info("S%x shut down by %s", c->tag, c->who);
323 sink_writes(ev_writer_sink(c->w), "250 shutting down\n");
324 ev_writer_flush(c->w);
325 quit(c->ev);
326}
327
328static int c_reconfigure(struct conn *c,
329 char attribute((unused)) **vec,
330 int attribute((unused)) nvec) {
331 info("S%x reconfigure by %s", c->tag, c->who);
332 if(reconfigure(c->ev, 1))
333 sink_writes(ev_writer_sink(c->w), "550 error reading new config\n");
334 else
335 sink_writes(ev_writer_sink(c->w), "250 installed new config\n");
336 return 1; /* completed */
337}
338
339static int c_rescan(struct conn *c,
340 char attribute((unused)) **vec,
341 int attribute((unused)) nvec) {
342 info("S%x rescan by %s", c->tag, c->who);
343 trackdb_rescan(c->ev);
344 sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n");
345 return 1; /* completed */
346}
347
348static int c_version(struct conn *c,
349 char attribute((unused)) **vec,
350 int attribute((unused)) nvec) {
351 /* VERSION had better only use the basic character set */
a05e4467 352 sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string);
460b9539 353 return 1; /* completed */
354}
355
356static int c_playing(struct conn *c,
357 char attribute((unused)) **vec,
358 int attribute((unused)) nvec) {
359 if(playing) {
360 queue_fix_sofar(playing);
361 playing->expected = 0;
362 sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing));
363 } else
364 sink_printf(ev_writer_sink(c->w), "259 nothing playing\n");
365 return 1; /* completed */
366}
367
368static int c_become(struct conn *c,
369 char **vec,
370 int attribute((unused)) nvec) {
371 c->who = vec[0];
372 sink_writes(ev_writer_sink(c->w), "230 OK\n");
373 return 1;
374}
375
b12be54a 376static const char *connection_host(struct conn *c) {
460b9539 377 union {
378 struct sockaddr sa;
379 struct sockaddr_in in;
380 struct sockaddr_in6 in6;
381 } u;
382 socklen_t l;
b12be54a 383 int n;
460b9539 384 char host[1024];
385
460b9539 386 /* get connection data */
387 l = sizeof u;
388 if(getpeername(c->fd, &u.sa, &l) < 0) {
389 error(errno, "S%x error calling getpeername", c->tag);
b12be54a 390 return 0;
460b9539 391 }
392 if(c->l->pf != PF_UNIX) {
393 if((n = getnameinfo(&u.sa, l,
394 host, sizeof host, 0, 0, NI_NUMERICHOST))) {
395 error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n));
b12be54a 396 return 0;
460b9539 397 }
b12be54a 398 return xstrdup(host);
18e6d6e6 399 } else
b12be54a
RK		 400 return "local";
401}
402
403static int c_user(struct conn *c,
404 char **vec,
405 int attribute((unused)) nvec) {
406 int n;
407 const char *res, *host;
408
409 if(c->who) {
410 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
411 return 1;
412 }
413 /* get connection data */
414 if(!(host = connection_host(c))) {
415 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
416 return 1;
417 }
460b9539 418 /* find the user */
419 for(n = 0; n < config->allow.n
420 && strcmp(config->allow.s[n].s[0], vec[0]); ++n)
421 ;
422 /* if it's a real user check whether the response is right */
18e6d6e6 423 if(n >= config->allow.n) {
424 info("S%x unknown user '%s' from %s", c->tag, vec[0], host);
425 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
426 return 1;
427 }
637fdea3
RK		 428 res = authhash(c->nonce, sizeof c->nonce, config->allow.s[n].s[1],
429 config->authorization_algorithm);
18e6d6e6 430 if(wideopen || (res && !strcmp(res, vec[1]))) {
431 c->who = vec[0];
432 /* currently we only bother logging remote connections */
b12be54a 433 if(strcmp(host, "local"))
18e6d6e6 434 info("S%x %s connected from %s", c->tag, vec[0], host);
435 sink_writes(ev_writer_sink(c->w), "230 OK\n");
436 return 1;
460b9539 437 }
438 /* oops, response was wrong */
18e6d6e6 439 info("S%x authentication failure for %s from %s", c->tag, vec[0], host);
460b9539 440 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
441 return 1;
442}
443
444static int c_recent(struct conn *c,
445 char attribute((unused)) **vec,
446 int attribute((unused)) nvec) {
447 const struct queue_entry *q;
448
449 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
450 for(q = phead.next; q != &phead; q = q->next)
451 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
452 sink_writes(ev_writer_sink(c->w), ".\n");
453 return 1; /* completed */
454}
455
456static int c_queue(struct conn *c,
457 char attribute((unused)) **vec,
458 int attribute((unused)) nvec) {
459 struct queue_entry *q;
460 time_t when = 0;
461 const char *l;
462 long length;
463
464 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
465 if(playing_is_enabled() && !paused) {
466 if(playing) {
467 queue_fix_sofar(playing);
468 if((l = trackdb_get(playing->track, "_length"))
469 && (length = atol(l))) {
470 time(&when);
471 when += length - playing->sofar + config->gap;
472 }
473 } else
474 /* Nothing is playing but playing is enabled, so whatever is
475 * first in the queue can be expected to start immediately. */
476 time(&when);
477 }
478 for(q = qhead.next; q != &qhead; q = q->next) {
479 /* fill in estimated start time */
480 q->expected = when;
481 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
482 /* update for next track */
483 if(when) {
484 if((l = trackdb_get(q->track, "_length"))
485 && (length = atol(l)))
486 when += length + config->gap;
487 else
488 when = 0;
489 }
490 }
491 sink_writes(ev_writer_sink(c->w), ".\n");
492 return 1; /* completed */
493}
494
495static int output_list(struct conn *c, char **vec) {
496 while(*vec)
497 sink_printf(ev_writer_sink(c->w), "%s\n", *vec++);
498 sink_writes(ev_writer_sink(c->w), ".\n");
499 return 1;
500}
501
502static int files_dirs(struct conn *c,
503 char **vec,
504 int nvec,
505 enum trackdb_listable what) {
506 const char *dir, *re, *errstr;
507 int erroffset;
508 pcre *rec;
509 char **fvec, *key;
510
511 switch(nvec) {
512 case 0: dir = 0; re = 0; break;
513 case 1: dir = vec[0]; re = 0; break;
514 case 2: dir = vec[0]; re = vec[1]; break;
515 default: abort();
516 }
517 /* A bit of a bodge to make sure the args don't trample on cache keys */
518 if(dir && strchr(dir, '\n')) {
519 sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n");
520 return 1;
521 }
522 if(re && strchr(re, '\n')) {
523 sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n");
524 return 1;
525 }
526 /* We bother eliminating "" because the web interface is relatively
527 * likely to send it */
528 if(re && *re) {
529 byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re);
530 fvec = (char **)cache_get(&cache_files_type, key);
531 if(fvec) {
532 /* Got a cache hit, don't store the answer in the cache */
533 key = 0;
534 ++cache_files_hits;
535 rec = 0; /* quieten compiler */
536 } else {
537 /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer
538 * in the cache. */
539 if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8,
540 &errstr, &erroffset, 0))) {
541 sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n",
542 errstr);
543 return 1;
544 }
545 /* It only counts as a miss if the regexp was valid. */
546 ++cache_files_misses;
547 }
548 } else {
549 /* No regexp, don't bother caching the result */
550 rec = 0;
551 key = 0;
552 fvec = 0;
553 }
554 if(!fvec) {
555 /* No cache hit (either because a miss, or because we did not look) so do
556 * the lookup */
557 if(dir && *dir)
558 fvec = trackdb_list(dir, 0, what, rec);
559 else
560 fvec = trackdb_list(0, 0, what, rec);
561 }
562 if(key)
563 /* Put the answer in the cache */
564 cache_put(&cache_files_type, key, fvec);
565 sink_writes(ev_writer_sink(c->w), "253 Listing follow\n");
566 return output_list(c, fvec);
567}
568
569static int c_files(struct conn *c,
570 char **vec,
571 int nvec) {
572 return files_dirs(c, vec, nvec, trackdb_files);
573}
574
575static int c_dirs(struct conn *c,
576 char **vec,
577 int nvec) {
578 return files_dirs(c, vec, nvec, trackdb_directories);
579}
580
581static int c_allfiles(struct conn *c,
582 char **vec,
583 int nvec) {
584 return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files);
585}
586
587static int c_get(struct conn *c,
588 char **vec,
589 int attribute((unused)) nvec) {
590 const char *v;
591
592 if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1])))
593 sink_printf(ev_writer_sink(c->w), "252 %s\n", v);
594 else
fb1bc1f5 595 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 596 return 1;
597}
598
599static int c_length(struct conn *c,
600 char **vec,
601 int attribute((unused)) nvec) {
602 const char *track, *v;
603
604 if(!(track = trackdb_resolve(vec[0]))) {
605 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
606 return 1;
607 }
608 if((v = trackdb_get(track, "_length")))
609 sink_printf(ev_writer_sink(c->w), "252 %s\n", v);
610 else
611 sink_writes(ev_writer_sink(c->w), "550 not found\n");
612 return 1;
613}
614
615static int c_set(struct conn *c,
616 char **vec,
617 int attribute((unused)) nvec) {
618 if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2]))
619 sink_writes(ev_writer_sink(c->w), "250 OK\n");
620 else
621 sink_writes(ev_writer_sink(c->w), "550 not found\n");
622 return 1;
623}
624
625static int c_prefs(struct conn *c,
626 char **vec,
627 int attribute((unused)) nvec) {
628 struct kvp *k;
629
630 k = trackdb_get_all(vec[0]);
631 sink_writes(ev_writer_sink(c->w), "253 prefs follow\n");
632 for(; k; k = k->next)
633 if(k->name[0] != '_') /* omit internal values */
634 sink_printf(ev_writer_sink(c->w),
635 " %s %s\n", quoteutf8(k->name), quoteutf8(k->value));
636 sink_writes(ev_writer_sink(c->w), ".\n");
637 return 1;
638}
639
640static int c_exists(struct conn *c,
641 char **vec,
642 int attribute((unused)) nvec) {
643 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]);
644 return 1;
645}
646
647static void search_parse_error(const char *msg, void *u) {
648 *(const char **)u = msg;
649}
650
651static int c_search(struct conn *c,
652 char **vec,
653 int attribute((unused)) nvec) {
654 char **terms, **results;
655 int nterms, nresults, n;
656 const char *e = "unknown error";
657
658 /* This is a bit of a bodge. Initially it's there to make the eclient
659 * interface a bit more convenient to add searching to, but it has the more
660 * compelling advantage that if everything uses it, then interpretation of
661 * user-supplied search strings will be the same everywhere. */
662 if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) {
663 sink_printf(ev_writer_sink(c->w), "550 %s\n", e);
664 } else {
665 results = trackdb_search(terms, nterms, &nresults);
666 sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults);
667 for(n = 0; n < nresults; ++n)
668 sink_printf(ev_writer_sink(c->w), "%s\n", results[n]);
669 sink_writes(ev_writer_sink(c->w), ".\n");
670 }
671 return 1;
672}
673
674static int c_random_enable(struct conn *c,
675 char attribute((unused)) **vec,
676 int attribute((unused)) nvec) {
677 enable_random(c->who, c->ev);
678 /* Enable implicitly unpauses if there is nothing playing */
679 if(paused && !playing) resume_playing(c->who);
680 sink_writes(ev_writer_sink(c->w), "250 OK\n");
681 return 1; /* completed */
682}
683
684static int c_random_disable(struct conn *c,
685 char attribute((unused)) **vec,
686 int attribute((unused)) nvec) {
687 disable_random(c->who);
688 sink_writes(ev_writer_sink(c->w), "250 OK\n");
689 return 1; /* completed */
690}
691
692static int c_random_enabled(struct conn *c,
693 char attribute((unused)) **vec,
694 int attribute((unused)) nvec) {
695 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]);
696 return 1; /* completed */
697}
698
d6dde5a3
RK		 699static void got_stats(char *stats, void *u) {
700 struct conn *const c = u;
701
702 sink_printf(ev_writer_sink(c->w), "253 stats\n%s\n.\n", stats);
703 /* Now we can start processing commands again */
704 ev_reader_enable(c->r);
705}
706
460b9539 707static int c_stats(struct conn *c,
708 char attribute((unused)) **vec,
709 int attribute((unused)) nvec) {
d6dde5a3
RK		 710 trackdb_stats_subprocess(c->ev, got_stats, c);
711 return 0; /* not yet complete */
460b9539 712}
713
714static int c_volume(struct conn *c,
715 char **vec,
716 int nvec) {
717 int l, r, set;
718 char lb[32], rb[32];
719
720 switch(nvec) {
721 case 0:
722 set = 0;
723 break;
724 case 1:
725 l = r = atoi(vec[0]);
726 set = 1;
727 break;
728 case 2:
729 l = atoi(vec[0]);
730 r = atoi(vec[1]);
731 set = 1;
732 break;
733 default:
734 abort();
735 }
736 if(mixer_control(&l, &r, set))
737 sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n");
738 else {
739 sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r);
740 if(l != volume_left || r != volume_right) {
741 volume_left = l;
742 volume_right = r;
743 snprintf(lb, sizeof lb, "%d", l);
744 snprintf(rb, sizeof rb, "%d", r);
745 eventlog("volume", lb, rb, (char *)0);
746 }
747 }
748 return 1;
749}
750
397ef7bb
RK		 751/** @brief Called when data arrives on a log connection
752 *
753 * We just discard all such data. The client may occasionally send data as a
754 * keepalive.
755 */
756static int logging_reader_callback(ev_source attribute((unused)) *ev,
460b9539 757 ev_reader *reader,
397ef7bb 758 void attribute((unused)) *ptr,
460b9539 759 size_t bytes,
397ef7bb
RK		 760 int attribute((unused)) eof,
761 void attribute((unused)) *u) {
460b9539 762 struct conn *c = u;
763
397ef7bb
RK		 764 ev_reader_consume(reader, bytes);
765 if(eof) {
766 /* Oops, that's all for now */
8d8b8c1f 767 D(("logging reader eof"));
397ef7bb 768 if(c->w) {
8d8b8c1f 769 D(("close writer"));
397ef7bb
RK		 770 ev_writer_close(c->w);
771 c->w = 0;
772 }
773 c->r = 0;
f6033c46 774 }
397ef7bb 775 return 0;
460b9539 776}
777
778static void logclient(const char *msg, void *user) {
779 struct conn *c = user;
780
f6033c46
RK		 781 if(!c->w || !c->r) {
782 /* This connection has gone up in smoke for some reason */
783 eventlog_remove(c->lo);
784 return;
785 }
460b9539 786 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n",
787 (uintmax_t)time(0), msg);
788}
789
790static int c_log(struct conn *c,
791 char attribute((unused)) **vec,
792 int attribute((unused)) nvec) {
793 time_t now;
794
795 sink_writes(ev_writer_sink(c->w), "254 OK\n");
796 /* pump out initial state */
797 time(&now);
798 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
799 (uintmax_t)now,
800 playing_is_enabled() ? "enable_play" : "disable_play");
801 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
802 (uintmax_t)now,
803 random_is_enabled() ? "enable_random" : "disable_random");
804 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
805 (uintmax_t)now,
806 paused ? "pause" : "resume");
5abe307a
RK		 807 if(playing)
808 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state playing\n",
809 (uintmax_t)now);
df44d69b
RK		 810 /* Initial volume */
811 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" volume %d %d\n",
812 (uintmax_t)now, volume_left, volume_right);
460b9539 813 c->lo = xmalloc(sizeof *c->lo);
814 c->lo->fn = logclient;
815 c->lo->user = c;
816 eventlog_add(c->lo);
817 c->reader = logging_reader_callback;
818 return 0;
819}
820
460b9539 821static int c_move(struct conn *c,
822 char **vec,
823 int attribute((unused)) nvec) {
824 struct queue_entry *q;
825 int n;
826
827 if(config->restrictions & RESTRICT_MOVE) {
828 if(!trusted(c)) {
829 sink_writes(ev_writer_sink(c->w),
830 "550 only trusted users can move tracks\n");
831 return 1;
832 }
833 }
834 if(!(q = queue_find(vec[0]))) {
835 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
836 return 1;
837 }
838 n = queue_move(q, atoi(vec[1]), c->who);
460b9539 839 sink_printf(ev_writer_sink(c->w), "252 %d\n", n);
840 /* If we've moved to the head of the queue then prepare the track. */
841 if(q == qhead.next)
842 prepare(c->ev, q);
843 return 1;
844}
845
846static int c_moveafter(struct conn *c,
847 char **vec,
848 int attribute((unused)) nvec) {
849 struct queue_entry *q, **qs;
850 int n;
851
852 if(config->restrictions & RESTRICT_MOVE) {
853 if(!trusted(c)) {
854 sink_writes(ev_writer_sink(c->w),
855 "550 only trusted users can move tracks\n");
856 return 1;
857 }
858 }
859 if(vec[0][0]) {
860 if(!(q = queue_find(vec[0]))) {
861 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
862 return 1;
863 }
864 } else
865 q = 0;
866 ++vec;
867 --nvec;
868 qs = xcalloc(nvec, sizeof *qs);
869 for(n = 0; n < nvec; ++n)
870 if(!(qs[n] = queue_find(vec[n]))) {
871 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
872 return 1;
873 }
874 queue_moveafter(q, nvec, qs, c->who);
460b9539 875 sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n");
876 /* If we've moved to the head of the queue then prepare the track. */
877 if(q == qhead.next)
878 prepare(c->ev, q);
879 return 1;
880}
881
882static int c_part(struct conn *c,
883 char **vec,
884 int attribute((unused)) nvec) {
885 sink_printf(ev_writer_sink(c->w), "252 %s\n",
886 trackdb_getpart(vec[0], vec[1], vec[2]));
887 return 1;
888}
889
890static int c_resolve(struct conn *c,
891 char **vec,
892 int attribute((unused)) nvec) {
893 const char *track;
894
895 if(!(track = trackdb_resolve(vec[0]))) {
896 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
897 return 1;
898 }
899 sink_printf(ev_writer_sink(c->w), "252 %s\n", track);
900 return 1;
901}
902
903static int c_tags(struct conn *c,
904 char attribute((unused)) **vec,
905 int attribute((unused)) nvec) {
906 char **tags = trackdb_alltags();
907
908 sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n");
909 while(*tags) {
910 sink_printf(ev_writer_sink(c->w), "%s%s\n",
911 **tags == '.' ? "." : "", *tags);
912 ++tags;
913 }
914 sink_writes(ev_writer_sink(c->w), ".\n");
915 return 1; /* completed */
916
917}
918
919static int c_set_global(struct conn *c,
920 char **vec,
921 int attribute((unused)) nvec) {
f9635e06
RK		 922 if(vec[0][0] == '_') {
923 sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n");
924 return 1;
925 }
460b9539 926 trackdb_set_global(vec[0], vec[1], c->who);
927 sink_printf(ev_writer_sink(c->w), "250 OK\n");
928 return 1;
929}
930
931static int c_get_global(struct conn *c,
932 char **vec,
933 int attribute((unused)) nvec) {
934 const char *s = trackdb_get_global(vec[0]);
935
936 if(s)
937 sink_printf(ev_writer_sink(c->w), "252 %s\n", s);
938 else
fb1bc1f5 939 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 940 return 1;
941}
942
7858930d 943static int c_nop(struct conn *c,
944 char attribute((unused)) **vec,
945 int attribute((unused)) nvec) {
946 sink_printf(ev_writer_sink(c->w), "250 Quack\n");
947 return 1;
948}
949
2a10b70b
RK		 950static int c_new(struct conn *c,
951 char **vec,
952 int nvec) {
953 char **tracks = trackdb_new(0, nvec > 0 ? atoi(vec[0]) : INT_MAX);
954
955 sink_printf(ev_writer_sink(c->w), "253 New track list follows\n");
956 while(*tracks) {
957 sink_printf(ev_writer_sink(c->w), "%s%s\n",
958 **tracks == '.' ? "." : "", *tracks);
959 ++tracks;
960 }
961 sink_writes(ev_writer_sink(c->w), ".\n");
962 return 1; /* completed */
963
964}
965
ca831831
RK		 966static int c_rtp_address(struct conn *c,
967 char attribute((unused)) **vec,
968 int attribute((unused)) nvec) {
969 if(config->speaker_backend == BACKEND_NETWORK) {
970 sink_printf(ev_writer_sink(c->w), "252 %s %s\n",
971 quoteutf8(config->broadcast.s[0]),
972 quoteutf8(config->broadcast.s[1]));
973 } else
974 sink_writes(ev_writer_sink(c->w), "550 No RTP\n");
975 return 1;
976}
b12be54a
RK		 977
978static int c_cookie(struct conn *c,
979 char **vec,
980 int attribute((unused)) nvec) {
981 const char *host;
982 char *user;
983
984 /* Can't log in twice on the same connection */
985 if(c->who) {
986 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
987 return 1;
988 }
989 /* Get some kind of peer identifcation */
990 if(!(host = connection_host(c))) {
991 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
992 return 1;
993 }
994 /* Check the cookie */
995 user = verify_cookie(vec[0]);
996 if(!user) {
997 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
998 return 1;
999 }
1000 /* Log in */
1001 c->who = user;
1002 c->cookie = vec[0];
1003 if(strcmp(host, "local"))
1004 info("S%x %s connected with cookie from %s", c->tag, user, host);
1005 sink_writes(ev_writer_sink(c->w), "230 OK\n");
1006 return 1;
1007}
1008
1009static int c_make_cookie(struct conn *c,
1010 char attribute((unused)) **vec,
1011 int attribute((unused)) nvec) {
1012 const char *cookie = make_cookie(c->who);
1013
1014 if(cookie)
1015 sink_printf(ev_writer_sink(c->w), "252 %s\n", cookie);
1016 else
1017 sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n");
1018 return 1;
1019}
1020
1021static int c_revoke(struct conn *c,
1022 char attribute((unused)) **vec,
1023 int attribute((unused)) nvec) {
1024 if(c->cookie) {
1025 revoke_cookie(c->cookie);
1026 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1027 } else
1028 sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n");
1029 return 1;
1030}
1031
460b9539 1032#define C_AUTH 0001 /* must be authenticated */
1033#define C_TRUSTED 0002 /* must be trusted user */
1034
1035static const struct command {
1036 const char *name;
1037 int minargs, maxargs;
1038 int (*fn)(struct conn *, char **, int);
1039 unsigned flags;
1040} commands[] = {
1041 { "allfiles", 0, 2, c_allfiles, C_AUTH },
1042 { "become", 1, 1, c_become, C_AUTH|C_TRUSTED },
b12be54a 1043 { "cookie", 1, 1, c_cookie, 0 },
460b9539 1044 { "dirs", 0, 2, c_dirs, C_AUTH },
1045 { "disable", 0, 1, c_disable, C_AUTH },
1046 { "enable", 0, 0, c_enable, C_AUTH },
1047 { "enabled", 0, 0, c_enabled, C_AUTH },
1048 { "exists", 1, 1, c_exists, C_AUTH },
1049 { "files", 0, 2, c_files, C_AUTH },
1050 { "get", 2, 2, c_get, C_AUTH },
1051 { "get-global", 1, 1, c_get_global, C_AUTH },
1052 { "length", 1, 1, c_length, C_AUTH },
1053 { "log", 0, 0, c_log, C_AUTH },
b12be54a 1054 { "make-cookie", 0, 0, c_make_cookie, C_AUTH },
460b9539 1055 { "move", 2, 2, c_move, C_AUTH },
1056 { "moveafter", 1, INT_MAX, c_moveafter, C_AUTH },
2a10b70b 1057 { "new", 0, 1, c_new, C_AUTH },
7858930d 1058 { "nop", 0, 0, c_nop, C_AUTH },
460b9539 1059 { "part", 3, 3, c_part, C_AUTH },
1060 { "pause", 0, 0, c_pause, C_AUTH },
1061 { "play", 1, 1, c_play, C_AUTH },
1062 { "playing", 0, 0, c_playing, C_AUTH },
1063 { "prefs", 1, 1, c_prefs, C_AUTH },
1064 { "queue", 0, 0, c_queue, C_AUTH },
1065 { "random-disable", 0, 0, c_random_disable, C_AUTH },
1066 { "random-enable", 0, 0, c_random_enable, C_AUTH },
1067 { "random-enabled", 0, 0, c_random_enabled, C_AUTH },
1068 { "recent", 0, 0, c_recent, C_AUTH },
1069 { "reconfigure", 0, 0, c_reconfigure, C_AUTH|C_TRUSTED },
1070 { "remove", 1, 1, c_remove, C_AUTH },
1071 { "rescan", 0, 0, c_rescan, C_AUTH|C_TRUSTED },
1072 { "resolve", 1, 1, c_resolve, C_AUTH },
1073 { "resume", 0, 0, c_resume, C_AUTH },
b12be54a 1074 { "revoke", 0, 0, c_revoke, C_AUTH },
ca831831 1075 { "rtp-address", 0, 0, c_rtp_address, C_AUTH },
460b9539 1076 { "scratch", 0, 1, c_scratch, C_AUTH },
1077 { "search", 1, 1, c_search, C_AUTH },
1078 { "set", 3, 3, c_set, C_AUTH, },
1079 { "set-global", 2, 2, c_set_global, C_AUTH },
1080 { "shutdown", 0, 0, c_shutdown, C_AUTH|C_TRUSTED },
1081 { "stats", 0, 0, c_stats, C_AUTH },
1082 { "tags", 0, 0, c_tags, C_AUTH },
1083 { "unset", 2, 2, c_set, C_AUTH },
1084 { "unset-global", 1, 1, c_set_global, C_AUTH },
1085 { "user", 2, 2, c_user, 0 },
1086 { "version", 0, 0, c_version, C_AUTH },
1087 { "volume", 0, 2, c_volume, C_AUTH }
1088};
1089
1090static void command_error(const char *msg, void *u) {
1091 struct conn *c = u;
1092
1093 sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg);
1094}
1095
1096/* process a command. Return 1 if complete, 0 if incomplete. */
1097static int command(struct conn *c, char *line) {
1098 char **vec;
1099 int nvec, n;
1100
1101 D(("server command %s", line));
f9635e06
RK		 1102 /* We force everything into NFC as early as possible */
1103 if(!(line = utf8_compose_canon(line, strlen(line), 0))) {
1104 sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n");
1105 return 1;
1106 }
460b9539 1107 if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) {
1108 sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n");
1109 return 1;
1110 }
1111 if(nvec == 0) {
1112 sink_writes(ev_writer_sink(c->w), "500 do what?\n");
1113 return 1;
1114 }
1115 if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0)
1116 sink_writes(ev_writer_sink(c->w), "500 unknown command\n");
1117 else {
1118 if((commands[n].flags & C_AUTH) && !c->who) {
1119 sink_writes(ev_writer_sink(c->w), "530 not authenticated\n");
1120 return 1;
1121 }
1122 if((commands[n].flags & C_TRUSTED) && !trusted(c)) {
1123 sink_writes(ev_writer_sink(c->w), "530 insufficient privilege\n");
1124 return 1;
1125 }
1126 ++vec;
1127 --nvec;
1128 if(nvec < commands[n].minargs) {
1129 sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n");
1130 return 1;
1131 }
1132 if(nvec > commands[n].maxargs) {
1133 sink_writes(ev_writer_sink(c->w), "500 too many arguments\n");
1134 return 1;
1135 }
1136 return commands[n].fn(c, vec, nvec);
1137 }
1138 return 1; /* completed */
1139}
1140
1141/* redirect to the right reader callback for our current state */
1142static int redirect_reader_callback(ev_source *ev,
1143 ev_reader *reader,
460b9539 1144 void *ptr,
1145 size_t bytes,
1146 int eof,
1147 void *u) {
1148 struct conn *c = u;
1149
75d64210 1150 return c->reader(ev, reader, ptr, bytes, eof, u);
460b9539 1151}
1152
1153/* the main command reader */
1154static int reader_callback(ev_source attribute((unused)) *ev,
1155 ev_reader *reader,
460b9539 1156 void *ptr,
1157 size_t bytes,
1158 int eof,
1159 void *u) {
1160 struct conn *c = u;
1161 char *eol;
1162 int complete;
1163
1164 D(("server reader_callback"));
1165 while((eol = memchr(ptr, '\n', bytes))) {
1166 *eol++ = 0;
1167 ev_reader_consume(reader, eol - (char *)ptr);
1168 complete = command(c, ptr);
1169 bytes -= (eol - (char *)ptr);
1170 ptr = eol;
1171 if(!complete) {
1172 /* the command had better have set a new reader callback */
1173 if(bytes || eof)
1174 /* there are further bytes to read, or we are at eof; arrange for the
1175 * command's reader callback to handle them */
1176 return ev_reader_incomplete(reader);
1177 /* nothing's going on right now */
1178 return 0;
1179 }
1180 /* command completed, we can go around and handle the next one */
1181 }
1182 if(eof) {
1183 if(bytes)
1184 error(0, "S%x unterminated line", c->tag);
8d8b8c1f 1185 D(("normal reader close"));
397ef7bb
RK		 1186 c->r = 0;
1187 if(c->w) {
8d8b8c1f 1188 D(("close associated writer"));
397ef7bb
RK		 1189 ev_writer_close(c->w);
1190 c->w = 0;
1191 }
460b9539 1192 }
1193 return 0;
1194}
1195
1196static int listen_callback(ev_source *ev,
1197 int fd,
1198 const struct sockaddr attribute((unused)) *remote,
1199 socklen_t attribute((unused)) rlen,
1200 void *u) {
1201 const struct listener *l = u;
1202 struct conn *c = xmalloc(sizeof *c);
1203 static unsigned tags;
1204
1205 D(("server listen_callback fd %d (%s)", fd, l->name));
1206 nonblock(fd);
1207 cloexec(fd);
1208 c->tag = tags++;
1209 c->ev = ev;
e8c92ba7
RK		 1210 c->w = ev_writer_new(ev, fd, writer_error, c,
1211 "client writer");
1212 c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c,
1213 "client reader");
75d64210 1214 ev_tie(c->r, c->w);
460b9539 1215 c->fd = fd;
1216 c->reader = reader_callback;
1217 c->l = l;
1218 gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM);
637fdea3
RK		 1219 if(!strcmp(config->authorization_algorithm, "sha1")
1220 || !strcmp(config->authorization_algorithm, "SHA1")) {
1221 sink_printf(ev_writer_sink(c->w), "231 %s\n",
1222 hex(c->nonce, sizeof c->nonce));
1223 } else {
1224 sink_printf(ev_writer_sink(c->w), "231 %s %s\n",
1225 config->authorization_algorithm,
1226 hex(c->nonce, sizeof c->nonce));
1227 }
460b9539 1228 return 0;
1229}
1230
1231int server_start(ev_source *ev, int pf,
1232 size_t socklen, const struct sockaddr *sa,
1233 const char *name) {
1234 int fd;
1235 struct listener *l = xmalloc(sizeof *l);
1236 static const int one = 1;
1237
1238 D(("server_init socket %s", name));
1239 fd = xsocket(pf, SOCK_STREAM, 0);
1240 xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
1241 if(bind(fd, sa, socklen) < 0) {
1242 error(errno, "error binding to %s", name);
1243 return -1;
1244 }
1245 xlisten(fd, 128);
1246 nonblock(fd);
1247 cloexec(fd);
1248 l->name = name;
1249 l->pf = pf;
e8c92ba7
RK		 1250 if(ev_listen(ev, fd, listen_callback, l, "server listener"))
1251 exit(EXIT_FAILURE);
460b9539 1252 return fd;
1253}
1254
1255int server_stop(ev_source *ev, int fd) {
1256 xclose(fd);
1257 return ev_listen_cancel(ev, fd);
1258}
1259
1260/*
1261Local Variables:
1262c-basic-offset:2
1263comment-column:40
1264fill-column:79
1265End:
1266*/
Multi-user software jukebox -- https://www.greenend.org.uk/rjk/disorder/