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[disorder] / server / server.c
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460b9539 1/*
2 * This file is part of DisOrder.
768d7355 3 * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell
460b9539 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22#include "types.h"
23
24#include <pwd.h>
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <sys/time.h>
28#include <unistd.h>
29#include <stdlib.h>
30#include <string.h>
31#include <errno.h>
32#include <fcntl.h>
33#include <gcrypt.h>
34#include <stddef.h>
35#include <time.h>
36#include <limits.h>
37#include <pcre.h>
38#include <netdb.h>
39#include <netinet/in.h>
40
41#include "event.h"
42#include "server.h"
43#include "syscalls.h"
44#include "queue.h"
f08c0859 45#include "server-queue.h"
460b9539 46#include "play.h"
47#include "log.h"
48#include "mem.h"
49#include "state.h"
50#include "charset.h"
51#include "split.h"
52#include "configuration.h"
53#include "hex.h"
5df73aeb 54#include "rights.h"
460b9539 55#include "trackdb.h"
56#include "table.h"
57#include "kvp.h"
58#include "mixer.h"
59#include "sink.h"
60#include "authhash.h"
61#include "plugin.h"
62#include "printf.h"
63#include "trackname.h"
64#include "eventlog.h"
65#include "defs.h"
66#include "cache.h"
f9635e06 67#include "unicode.h"
b12be54a 68#include "cookies.h"
fce810c2 69#include "base64.h"
460b9539 70
71#ifndef NONCE_SIZE
72# define NONCE_SIZE 16
73#endif
74
75int volume_left, volume_right; /* last known volume */
76
18e6d6e6 77/** @brief Accept all well-formed login attempts
78 *
79 * Used in debugging.
80 */
81int wideopen;
82
460b9539 83struct listener {
84 const char *name;
85 int pf;
86};
87
397ef7bb 88/** @brief One client connection */
460b9539 89struct conn {
397ef7bb 90 /** @brief Read commands from here */
460b9539 91 ev_reader *r;
397ef7bb 92 /** @brief Send responses to here */
460b9539 93 ev_writer *w;
397ef7bb 94 /** @brief Underlying file descriptor */
460b9539 95 int fd;
397ef7bb 96 /** @brief Unique identifier for connection used in log messages */
460b9539 97 unsigned tag;
397ef7bb 98 /** @brief Login name or NULL */
460b9539 99 char *who;
397ef7bb 100 /** @brief Event loop */
460b9539 101 ev_source *ev;
397ef7bb 102 /** @brief Nonce chosen for this connection */
460b9539 103 unsigned char nonce[NONCE_SIZE];
397ef7bb
RK
104 /** @brief Current reader callback
105 *
106 * We change this depending on whether we're servicing the @b log command
107 */
460b9539 108 ev_reader_callback *reader;
397ef7bb 109 /** @brief Event log output sending to this connection */
460b9539 110 struct eventlog_output *lo;
397ef7bb 111 /** @brief Parent listener */
460b9539 112 const struct listener *l;
b12be54a
RK
113 /** @brief Login cookie or NULL */
114 char *cookie;
eb5dc014
RK
115 /** @brief Connection rights */
116 rights_type rights;
460b9539 117};
118
119static int reader_callback(ev_source *ev,
120 ev_reader *reader,
460b9539 121 void *ptr,
122 size_t bytes,
123 int eof,
124 void *u);
125
126static const char *noyes[] = { "no", "yes" };
127
397ef7bb
RK
128/** @brief Called when a connection's writer fails or is shut down
129 *
130 * If the connection still has a raeder that is cancelled.
131 */
460b9539 132static int writer_error(ev_source attribute((unused)) *ev,
460b9539 133 int errno_value,
134 void *u) {
135 struct conn *c = u;
136
8d8b8c1f 137 D(("server writer_error S%x %d", c->tag, errno_value));
460b9539 138 if(errno_value == 0) {
139 /* writer is done */
8d8b8c1f 140 D(("S%x writer completed", c->tag));
460b9539 141 } else {
142 if(errno_value != EPIPE)
143 error(errno_value, "S%x write error on socket", c->tag);
38b8221f 144 if(c->r) {
8d8b8c1f 145 D(("cancel reader"));
38b8221f
RK
146 ev_reader_cancel(c->r);
147 c->r = 0;
148 }
8d8b8c1f 149 D(("done cancel reader"));
460b9539 150 }
38b8221f 151 c->w = 0;
75d64210 152 ev_report(ev);
460b9539 153 return 0;
154}
155
397ef7bb
RK
156/** @brief Called when a conncetion's reader fails or is shut down
157 *
158 * If connection still has a writer then it is closed.
159 */
460b9539 160static int reader_error(ev_source attribute((unused)) *ev,
460b9539 161 int errno_value,
162 void *u) {
163 struct conn *c = u;
164
8d8b8c1f 165 D(("server reader_error S%x %d", c->tag, errno_value));
1563f6f6 166 error(errno_value, "S%x read error on socket", c->tag);
38b8221f
RK
167 if(c->w)
168 ev_writer_close(c->w);
169 c->w = 0;
170 c->r = 0;
768d7355 171 ev_report(ev);
460b9539 172 return 0;
173}
174
460b9539 175static int c_disable(struct conn *c, char **vec, int nvec) {
176 if(nvec == 0)
177 disable_playing(c->who);
178 else if(nvec == 1 && !strcmp(vec[0], "now"))
179 disable_playing(c->who);
180 else {
181 sink_writes(ev_writer_sink(c->w), "550 invalid argument\n");
182 return 1; /* completed */
183 }
184 sink_writes(ev_writer_sink(c->w), "250 OK\n");
185 return 1; /* completed */
186}
187
188static int c_enable(struct conn *c,
189 char attribute((unused)) **vec,
190 int attribute((unused)) nvec) {
191 enable_playing(c->who, c->ev);
192 /* Enable implicitly unpauses if there is nothing playing */
193 if(paused && !playing) resume_playing(c->who);
194 sink_writes(ev_writer_sink(c->w), "250 OK\n");
195 return 1; /* completed */
196}
197
198static int c_enabled(struct conn *c,
199 char attribute((unused)) **vec,
200 int attribute((unused)) nvec) {
201 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[playing_is_enabled()]);
202 return 1; /* completed */
203}
204
205static int c_play(struct conn *c, char **vec,
206 int attribute((unused)) nvec) {
207 const char *track;
208 struct queue_entry *q;
209
210 if(!trackdb_exists(vec[0])) {
211 sink_writes(ev_writer_sink(c->w), "550 track is not in database\n");
212 return 1;
213 }
214 if(!(track = trackdb_resolve(vec[0]))) {
215 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
216 return 1;
217 }
218 q = queue_add(track, c->who, WHERE_BEFORE_RANDOM);
219 queue_write();
220 /* If we added the first track, and something is playing, then prepare the
221 * new track. If nothing is playing then we don't bother as it wouldn't gain
222 * anything. */
223 if(q == qhead.next && playing)
224 prepare(c->ev, q);
81e440ce 225 sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id);
460b9539 226 /* If the queue was empty but we are for some reason paused then
227 * unpause. */
228 if(!playing) resume_playing(0);
229 play(c->ev);
230 return 1; /* completed */
231}
232
233static int c_remove(struct conn *c, char **vec,
234 int attribute((unused)) nvec) {
235 struct queue_entry *q;
eb5dc014 236 rights_type r;
460b9539 237
238 if(!(q = queue_find(vec[0]))) {
239 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
240 return 1;
241 }
eb5dc014
RK
242 if(q->submitter)
243 if(!strcmp(q->submitter, c->who))
244 r = RIGHT_REMOVE_MINE;
245 else
246 r = RIGHT_REMOVE_ANY;
247 else
248 r = RIGHT_REMOVE_RANDOM;
249 if(!(c->rights & r)) {
250 sink_writes(ev_writer_sink(c->w),
251 "550 Not authorized to remove that track\n");
252 return 1;
460b9539 253 }
254 queue_remove(q, c->who);
255 /* De-prepare the track. */
256 abandon(c->ev, q);
eb5dc014 257 /* If we removed a random track then add another one. */
460b9539 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) {
eb5dc014
RK
271 rights_type r;
272
460b9539 273 if(!playing) {
274 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
275 return 1; /* completed */
276 }
eb5dc014
RK
277 /* TODO there is a bug here: if we specify an ID but it's not the currently
278 * playing track then you will get 550 if you weren't authorized to scratch
279 * the currently playing track. */
280 if(playing->submitter)
281 if(!strcmp(playing->submitter, c->who))
282 r = RIGHT_SCRATCH_MINE;
283 else
284 r = RIGHT_SCRATCH_ANY;
285 else
286 r = RIGHT_SCRATCH_RANDOM;
287 if(!(c->rights & r)) {
288 sink_writes(ev_writer_sink(c->w),
289 "550 Not authorized to scratch that track\n");
290 return 1;
460b9539 291 }
292 scratch(c->who, nvec == 1 ? vec[0] : 0);
293 /* If you scratch an unpaused track then it is automatically unpaused */
294 resume_playing(0);
295 sink_writes(ev_writer_sink(c->w), "250 scratched\n");
296 return 1; /* completed */
297}
298
299static int c_pause(struct conn *c,
300 char attribute((unused)) **vec,
301 int attribute((unused)) nvec) {
302 if(!playing) {
303 sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n");
304 return 1; /* completed */
305 }
306 if(paused) {
307 sink_writes(ev_writer_sink(c->w), "250 already paused\n");
308 return 1; /* completed */
309 }
310 if(pause_playing(c->who) < 0)
311 sink_writes(ev_writer_sink(c->w), "550 cannot pause this track\n");
312 else
313 sink_writes(ev_writer_sink(c->w), "250 paused\n");
314 return 1;
315}
316
317static int c_resume(struct conn *c,
318 char attribute((unused)) **vec,
319 int attribute((unused)) nvec) {
320 if(!paused) {
321 sink_writes(ev_writer_sink(c->w), "250 not paused\n");
322 return 1; /* completed */
323 }
324 resume_playing(c->who);
325 sink_writes(ev_writer_sink(c->w), "250 paused\n");
326 return 1;
327}
328
329static int c_shutdown(struct conn *c,
330 char attribute((unused)) **vec,
331 int attribute((unused)) nvec) {
332 info("S%x shut down by %s", c->tag, c->who);
333 sink_writes(ev_writer_sink(c->w), "250 shutting down\n");
334 ev_writer_flush(c->w);
335 quit(c->ev);
336}
337
338static int c_reconfigure(struct conn *c,
339 char attribute((unused)) **vec,
340 int attribute((unused)) nvec) {
341 info("S%x reconfigure by %s", c->tag, c->who);
342 if(reconfigure(c->ev, 1))
343 sink_writes(ev_writer_sink(c->w), "550 error reading new config\n");
344 else
345 sink_writes(ev_writer_sink(c->w), "250 installed new config\n");
346 return 1; /* completed */
347}
348
349static int c_rescan(struct conn *c,
350 char attribute((unused)) **vec,
351 int attribute((unused)) nvec) {
352 info("S%x rescan by %s", c->tag, c->who);
353 trackdb_rescan(c->ev);
354 sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n");
355 return 1; /* completed */
356}
357
358static int c_version(struct conn *c,
359 char attribute((unused)) **vec,
360 int attribute((unused)) nvec) {
361 /* VERSION had better only use the basic character set */
a05e4467 362 sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string);
460b9539 363 return 1; /* completed */
364}
365
366static int c_playing(struct conn *c,
367 char attribute((unused)) **vec,
368 int attribute((unused)) nvec) {
369 if(playing) {
370 queue_fix_sofar(playing);
371 playing->expected = 0;
372 sink_printf(ev_writer_sink(c->w), "252 %s\n", queue_marshall(playing));
373 } else
374 sink_printf(ev_writer_sink(c->w), "259 nothing playing\n");
375 return 1; /* completed */
376}
377
b12be54a 378static const char *connection_host(struct conn *c) {
460b9539 379 union {
380 struct sockaddr sa;
381 struct sockaddr_in in;
382 struct sockaddr_in6 in6;
383 } u;
384 socklen_t l;
b12be54a 385 int n;
460b9539 386 char host[1024];
387
460b9539 388 /* get connection data */
389 l = sizeof u;
390 if(getpeername(c->fd, &u.sa, &l) < 0) {
391 error(errno, "S%x error calling getpeername", c->tag);
b12be54a 392 return 0;
460b9539 393 }
394 if(c->l->pf != PF_UNIX) {
395 if((n = getnameinfo(&u.sa, l,
396 host, sizeof host, 0, 0, NI_NUMERICHOST))) {
397 error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n));
b12be54a 398 return 0;
460b9539 399 }
b12be54a 400 return xstrdup(host);
18e6d6e6 401 } else
b12be54a
RK
402 return "local";
403}
404
405static int c_user(struct conn *c,
406 char **vec,
407 int attribute((unused)) nvec) {
eb5dc014 408 struct kvp *k;
f0feb22e 409 const char *res, *host, *password;
eb5dc014 410 rights_type rights;
b12be54a
RK
411
412 if(c->who) {
413 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
414 return 1;
415 }
416 /* get connection data */
417 if(!(host = connection_host(c))) {
418 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
419 return 1;
420 }
460b9539 421 /* find the user */
eb5dc014 422 k = trackdb_getuserinfo(vec[0]);
f0feb22e 423 /* reject nonexistent users */
eb5dc014
RK
424 if(!k) {
425 error(0, "S%x unknown user '%s' from %s", c->tag, vec[0], host);
426 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
427 return 1;
428 }
429 /* reject unconfirmed users */
430 if(kvp_get(k, "confirmation")) {
431 error(0, "S%x unconfirmed user '%s' from %s", c->tag, vec[0], host);
432 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
433 return 1;
434 }
435 password = kvp_get(k, "password");
436 if(!password) password = "";
0f55e905 437 if(parse_rights(kvp_get(k, "rights"), &rights, 1)) {
eb5dc014 438 error(0, "error parsing rights for %s", vec[0]);
18e6d6e6 439 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
440 return 1;
441 }
f0feb22e
RK
442 /* check whether the response is right */
443 res = authhash(c->nonce, sizeof c->nonce, password,
637fdea3 444 config->authorization_algorithm);
18e6d6e6 445 if(wideopen || (res && !strcmp(res, vec[1]))) {
446 c->who = vec[0];
eb5dc014 447 c->rights = rights;
18e6d6e6 448 /* currently we only bother logging remote connections */
eb5dc014 449 if(strcmp(host, "local")) {
18e6d6e6 450 info("S%x %s connected from %s", c->tag, vec[0], host);
eb5dc014
RK
451 c->rights |= RIGHT__LOCAL;
452 }
18e6d6e6 453 sink_writes(ev_writer_sink(c->w), "230 OK\n");
454 return 1;
460b9539 455 }
456 /* oops, response was wrong */
18e6d6e6 457 info("S%x authentication failure for %s from %s", c->tag, vec[0], host);
460b9539 458 sink_writes(ev_writer_sink(c->w), "530 authentication failed\n");
459 return 1;
460}
461
462static int c_recent(struct conn *c,
463 char attribute((unused)) **vec,
464 int attribute((unused)) nvec) {
465 const struct queue_entry *q;
466
467 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
468 for(q = phead.next; q != &phead; q = q->next)
469 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
470 sink_writes(ev_writer_sink(c->w), ".\n");
471 return 1; /* completed */
472}
473
474static int c_queue(struct conn *c,
475 char attribute((unused)) **vec,
476 int attribute((unused)) nvec) {
477 struct queue_entry *q;
478 time_t when = 0;
479 const char *l;
480 long length;
481
482 sink_writes(ev_writer_sink(c->w), "253 Tracks follow\n");
483 if(playing_is_enabled() && !paused) {
484 if(playing) {
485 queue_fix_sofar(playing);
486 if((l = trackdb_get(playing->track, "_length"))
487 && (length = atol(l))) {
488 time(&when);
489 when += length - playing->sofar + config->gap;
490 }
491 } else
492 /* Nothing is playing but playing is enabled, so whatever is
493 * first in the queue can be expected to start immediately. */
494 time(&when);
495 }
496 for(q = qhead.next; q != &qhead; q = q->next) {
497 /* fill in estimated start time */
498 q->expected = when;
499 sink_printf(ev_writer_sink(c->w), " %s\n", queue_marshall(q));
500 /* update for next track */
501 if(when) {
502 if((l = trackdb_get(q->track, "_length"))
503 && (length = atol(l)))
504 when += length + config->gap;
505 else
506 when = 0;
507 }
508 }
509 sink_writes(ev_writer_sink(c->w), ".\n");
510 return 1; /* completed */
511}
512
513static int output_list(struct conn *c, char **vec) {
514 while(*vec)
515 sink_printf(ev_writer_sink(c->w), "%s\n", *vec++);
516 sink_writes(ev_writer_sink(c->w), ".\n");
517 return 1;
518}
519
520static int files_dirs(struct conn *c,
521 char **vec,
522 int nvec,
523 enum trackdb_listable what) {
524 const char *dir, *re, *errstr;
525 int erroffset;
526 pcre *rec;
527 char **fvec, *key;
528
529 switch(nvec) {
530 case 0: dir = 0; re = 0; break;
531 case 1: dir = vec[0]; re = 0; break;
532 case 2: dir = vec[0]; re = vec[1]; break;
533 default: abort();
534 }
535 /* A bit of a bodge to make sure the args don't trample on cache keys */
536 if(dir && strchr(dir, '\n')) {
537 sink_writes(ev_writer_sink(c->w), "550 invalid directory name\n");
538 return 1;
539 }
540 if(re && strchr(re, '\n')) {
541 sink_writes(ev_writer_sink(c->w), "550 invalid regexp\n");
542 return 1;
543 }
544 /* We bother eliminating "" because the web interface is relatively
545 * likely to send it */
546 if(re && *re) {
547 byte_xasprintf(&key, "%d\n%s\n%s", (int)what, dir ? dir : "", re);
548 fvec = (char **)cache_get(&cache_files_type, key);
549 if(fvec) {
550 /* Got a cache hit, don't store the answer in the cache */
551 key = 0;
552 ++cache_files_hits;
553 rec = 0; /* quieten compiler */
554 } else {
555 /* Cache miss, we'll do the lookup and key != 0 so we'll store the answer
556 * in the cache. */
557 if(!(rec = pcre_compile(re, PCRE_CASELESS|PCRE_UTF8,
558 &errstr, &erroffset, 0))) {
559 sink_printf(ev_writer_sink(c->w), "550 Error compiling regexp: %s\n",
560 errstr);
561 return 1;
562 }
563 /* It only counts as a miss if the regexp was valid. */
564 ++cache_files_misses;
565 }
566 } else {
567 /* No regexp, don't bother caching the result */
568 rec = 0;
569 key = 0;
570 fvec = 0;
571 }
572 if(!fvec) {
573 /* No cache hit (either because a miss, or because we did not look) so do
574 * the lookup */
575 if(dir && *dir)
576 fvec = trackdb_list(dir, 0, what, rec);
577 else
578 fvec = trackdb_list(0, 0, what, rec);
579 }
580 if(key)
581 /* Put the answer in the cache */
582 cache_put(&cache_files_type, key, fvec);
583 sink_writes(ev_writer_sink(c->w), "253 Listing follow\n");
584 return output_list(c, fvec);
585}
586
587static int c_files(struct conn *c,
588 char **vec,
589 int nvec) {
590 return files_dirs(c, vec, nvec, trackdb_files);
591}
592
593static int c_dirs(struct conn *c,
594 char **vec,
595 int nvec) {
596 return files_dirs(c, vec, nvec, trackdb_directories);
597}
598
599static int c_allfiles(struct conn *c,
600 char **vec,
601 int nvec) {
602 return files_dirs(c, vec, nvec, trackdb_directories|trackdb_files);
603}
604
605static int c_get(struct conn *c,
606 char **vec,
607 int attribute((unused)) nvec) {
608 const char *v;
609
610 if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1])))
7b32e917 611 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 612 else
fb1bc1f5 613 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 614 return 1;
615}
616
617static int c_length(struct conn *c,
618 char **vec,
619 int attribute((unused)) nvec) {
620 const char *track, *v;
621
622 if(!(track = trackdb_resolve(vec[0]))) {
623 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
624 return 1;
625 }
626 if((v = trackdb_get(track, "_length")))
7b32e917 627 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v));
460b9539 628 else
629 sink_writes(ev_writer_sink(c->w), "550 not found\n");
630 return 1;
631}
632
633static int c_set(struct conn *c,
634 char **vec,
635 int attribute((unused)) nvec) {
636 if(vec[1][0] != '_' && !trackdb_set(vec[0], vec[1], vec[2]))
637 sink_writes(ev_writer_sink(c->w), "250 OK\n");
638 else
639 sink_writes(ev_writer_sink(c->w), "550 not found\n");
640 return 1;
641}
642
643static int c_prefs(struct conn *c,
644 char **vec,
645 int attribute((unused)) nvec) {
646 struct kvp *k;
647
648 k = trackdb_get_all(vec[0]);
649 sink_writes(ev_writer_sink(c->w), "253 prefs follow\n");
650 for(; k; k = k->next)
651 if(k->name[0] != '_') /* omit internal values */
652 sink_printf(ev_writer_sink(c->w),
653 " %s %s\n", quoteutf8(k->name), quoteutf8(k->value));
654 sink_writes(ev_writer_sink(c->w), ".\n");
655 return 1;
656}
657
658static int c_exists(struct conn *c,
659 char **vec,
660 int attribute((unused)) nvec) {
661 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[trackdb_exists(vec[0])]);
662 return 1;
663}
664
665static void search_parse_error(const char *msg, void *u) {
666 *(const char **)u = msg;
667}
668
669static int c_search(struct conn *c,
670 char **vec,
671 int attribute((unused)) nvec) {
672 char **terms, **results;
673 int nterms, nresults, n;
674 const char *e = "unknown error";
675
676 /* This is a bit of a bodge. Initially it's there to make the eclient
677 * interface a bit more convenient to add searching to, but it has the more
678 * compelling advantage that if everything uses it, then interpretation of
679 * user-supplied search strings will be the same everywhere. */
680 if(!(terms = split(vec[0], &nterms, SPLIT_QUOTES, search_parse_error, &e))) {
681 sink_printf(ev_writer_sink(c->w), "550 %s\n", e);
682 } else {
683 results = trackdb_search(terms, nterms, &nresults);
684 sink_printf(ev_writer_sink(c->w), "253 %d matches\n", nresults);
685 for(n = 0; n < nresults; ++n)
686 sink_printf(ev_writer_sink(c->w), "%s\n", results[n]);
687 sink_writes(ev_writer_sink(c->w), ".\n");
688 }
689 return 1;
690}
691
692static int c_random_enable(struct conn *c,
693 char attribute((unused)) **vec,
694 int attribute((unused)) nvec) {
695 enable_random(c->who, c->ev);
696 /* Enable implicitly unpauses if there is nothing playing */
697 if(paused && !playing) resume_playing(c->who);
698 sink_writes(ev_writer_sink(c->w), "250 OK\n");
699 return 1; /* completed */
700}
701
702static int c_random_disable(struct conn *c,
703 char attribute((unused)) **vec,
704 int attribute((unused)) nvec) {
705 disable_random(c->who);
706 sink_writes(ev_writer_sink(c->w), "250 OK\n");
707 return 1; /* completed */
708}
709
710static int c_random_enabled(struct conn *c,
711 char attribute((unused)) **vec,
712 int attribute((unused)) nvec) {
713 sink_printf(ev_writer_sink(c->w), "252 %s\n", noyes[random_is_enabled()]);
714 return 1; /* completed */
715}
716
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717static void got_stats(char *stats, void *u) {
718 struct conn *const c = u;
719
720 sink_printf(ev_writer_sink(c->w), "253 stats\n%s\n.\n", stats);
721 /* Now we can start processing commands again */
722 ev_reader_enable(c->r);
723}
724
460b9539 725static int c_stats(struct conn *c,
726 char attribute((unused)) **vec,
727 int attribute((unused)) nvec) {
d6dde5a3
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728 trackdb_stats_subprocess(c->ev, got_stats, c);
729 return 0; /* not yet complete */
460b9539 730}
731
732static int c_volume(struct conn *c,
733 char **vec,
734 int nvec) {
735 int l, r, set;
736 char lb[32], rb[32];
eb5dc014 737 rights_type rights;
460b9539 738
739 switch(nvec) {
740 case 0:
741 set = 0;
742 break;
743 case 1:
744 l = r = atoi(vec[0]);
745 set = 1;
746 break;
747 case 2:
748 l = atoi(vec[0]);
749 r = atoi(vec[1]);
750 set = 1;
751 break;
752 default:
753 abort();
754 }
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755 rights = set ? RIGHT_VOLUME : RIGHT_READ;
756 if(!(c->rights & rights)) {
757 sink_writes(ev_writer_sink(c->w), "530 Prohibited\n");
758 return 1;
759 }
460b9539 760 if(mixer_control(&l, &r, set))
761 sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n");
762 else {
763 sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r);
764 if(l != volume_left || r != volume_right) {
765 volume_left = l;
766 volume_right = r;
767 snprintf(lb, sizeof lb, "%d", l);
768 snprintf(rb, sizeof rb, "%d", r);
769 eventlog("volume", lb, rb, (char *)0);
770 }
771 }
772 return 1;
773}
774
397ef7bb
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775/** @brief Called when data arrives on a log connection
776 *
777 * We just discard all such data. The client may occasionally send data as a
778 * keepalive.
779 */
780static int logging_reader_callback(ev_source attribute((unused)) *ev,
460b9539 781 ev_reader *reader,
397ef7bb 782 void attribute((unused)) *ptr,
460b9539 783 size_t bytes,
397ef7bb
RK
784 int attribute((unused)) eof,
785 void attribute((unused)) *u) {
460b9539 786 struct conn *c = u;
787
397ef7bb
RK
788 ev_reader_consume(reader, bytes);
789 if(eof) {
790 /* Oops, that's all for now */
8d8b8c1f 791 D(("logging reader eof"));
397ef7bb 792 if(c->w) {
8d8b8c1f 793 D(("close writer"));
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794 ev_writer_close(c->w);
795 c->w = 0;
796 }
797 c->r = 0;
f6033c46 798 }
397ef7bb 799 return 0;
460b9539 800}
801
802static void logclient(const char *msg, void *user) {
803 struct conn *c = user;
804
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805 if(!c->w || !c->r) {
806 /* This connection has gone up in smoke for some reason */
807 eventlog_remove(c->lo);
808 return;
809 }
460b9539 810 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" %s\n",
811 (uintmax_t)time(0), msg);
812}
813
814static int c_log(struct conn *c,
815 char attribute((unused)) **vec,
816 int attribute((unused)) nvec) {
817 time_t now;
818
819 sink_writes(ev_writer_sink(c->w), "254 OK\n");
820 /* pump out initial state */
821 time(&now);
822 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
823 (uintmax_t)now,
824 playing_is_enabled() ? "enable_play" : "disable_play");
825 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
826 (uintmax_t)now,
827 random_is_enabled() ? "enable_random" : "disable_random");
828 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state %s\n",
829 (uintmax_t)now,
830 paused ? "pause" : "resume");
5abe307a
RK
831 if(playing)
832 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" state playing\n",
833 (uintmax_t)now);
df44d69b
RK
834 /* Initial volume */
835 sink_printf(ev_writer_sink(c->w), "%"PRIxMAX" volume %d %d\n",
836 (uintmax_t)now, volume_left, volume_right);
460b9539 837 c->lo = xmalloc(sizeof *c->lo);
838 c->lo->fn = logclient;
839 c->lo->user = c;
840 eventlog_add(c->lo);
841 c->reader = logging_reader_callback;
842 return 0;
843}
844
eb5dc014
RK
845/** @brief Test whether a move is allowed
846 * @param c Connection
847 * @param qs List of IDs on queue
848 * @param nqs Number of IDs
849 * @return 0 if move is prohibited, non-0 if it is allowed
850 */
851static int has_move_rights(struct conn *c, struct queue_entry **qs, int nqs) {
852 rights_type r = 0;
853
854 for(; nqs > 0; ++qs, --nqs) {
855 struct queue_entry *const q = *qs;
856
857 if(q->submitter)
858 if(!strcmp(q->submitter, c->who))
859 r |= RIGHT_MOVE_MINE;
860 else
861 r |= RIGHT_MOVE_ANY;
862 else
863 r |= RIGHT_MOVE_RANDOM;
864 }
865 return (c->rights & r) == r;
866}
867
460b9539 868static int c_move(struct conn *c,
869 char **vec,
870 int attribute((unused)) nvec) {
871 struct queue_entry *q;
872 int n;
873
460b9539 874 if(!(q = queue_find(vec[0]))) {
875 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
876 return 1;
877 }
eb5dc014
RK
878 if(!has_move_rights(c, &q, 1)) {
879 sink_writes(ev_writer_sink(c->w),
880 "550 Not authorized to move that track\n");
881 return 1;
882 }
460b9539 883 n = queue_move(q, atoi(vec[1]), c->who);
460b9539 884 sink_printf(ev_writer_sink(c->w), "252 %d\n", n);
885 /* If we've moved to the head of the queue then prepare the track. */
886 if(q == qhead.next)
887 prepare(c->ev, q);
888 return 1;
889}
890
891static int c_moveafter(struct conn *c,
892 char **vec,
893 int attribute((unused)) nvec) {
894 struct queue_entry *q, **qs;
895 int n;
896
460b9539 897 if(vec[0][0]) {
898 if(!(q = queue_find(vec[0]))) {
899 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
900 return 1;
901 }
902 } else
903 q = 0;
904 ++vec;
905 --nvec;
906 qs = xcalloc(nvec, sizeof *qs);
907 for(n = 0; n < nvec; ++n)
908 if(!(qs[n] = queue_find(vec[n]))) {
909 sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n");
910 return 1;
911 }
eb5dc014
RK
912 if(!has_move_rights(c, qs, nvec)) {
913 sink_writes(ev_writer_sink(c->w),
914 "550 Not authorized to move those tracks\n");
915 return 1;
916 }
460b9539 917 queue_moveafter(q, nvec, qs, c->who);
460b9539 918 sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n");
919 /* If we've moved to the head of the queue then prepare the track. */
920 if(q == qhead.next)
921 prepare(c->ev, q);
922 return 1;
923}
924
925static int c_part(struct conn *c,
926 char **vec,
927 int attribute((unused)) nvec) {
928 sink_printf(ev_writer_sink(c->w), "252 %s\n",
7b32e917 929 quoteutf8(trackdb_getpart(vec[0], vec[1], vec[2])));
460b9539 930 return 1;
931}
932
933static int c_resolve(struct conn *c,
934 char **vec,
935 int attribute((unused)) nvec) {
936 const char *track;
937
938 if(!(track = trackdb_resolve(vec[0]))) {
939 sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n");
940 return 1;
941 }
7b32e917 942 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(track));
460b9539 943 return 1;
944}
945
946static int c_tags(struct conn *c,
947 char attribute((unused)) **vec,
948 int attribute((unused)) nvec) {
949 char **tags = trackdb_alltags();
950
951 sink_printf(ev_writer_sink(c->w), "253 Tag list follows\n");
952 while(*tags) {
953 sink_printf(ev_writer_sink(c->w), "%s%s\n",
954 **tags == '.' ? "." : "", *tags);
955 ++tags;
956 }
957 sink_writes(ev_writer_sink(c->w), ".\n");
958 return 1; /* completed */
460b9539 959}
960
961static int c_set_global(struct conn *c,
962 char **vec,
963 int attribute((unused)) nvec) {
f9635e06
RK
964 if(vec[0][0] == '_') {
965 sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n");
966 return 1;
967 }
460b9539 968 trackdb_set_global(vec[0], vec[1], c->who);
969 sink_printf(ev_writer_sink(c->w), "250 OK\n");
970 return 1;
971}
972
973static int c_get_global(struct conn *c,
974 char **vec,
975 int attribute((unused)) nvec) {
976 const char *s = trackdb_get_global(vec[0]);
977
978 if(s)
7b32e917 979 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(s));
460b9539 980 else
fb1bc1f5 981 sink_writes(ev_writer_sink(c->w), "555 not found\n");
460b9539 982 return 1;
983}
984
7858930d 985static int c_nop(struct conn *c,
986 char attribute((unused)) **vec,
987 int attribute((unused)) nvec) {
988 sink_printf(ev_writer_sink(c->w), "250 Quack\n");
989 return 1;
990}
991
2a10b70b
RK
992static int c_new(struct conn *c,
993 char **vec,
994 int nvec) {
995 char **tracks = trackdb_new(0, nvec > 0 ? atoi(vec[0]) : INT_MAX);
996
997 sink_printf(ev_writer_sink(c->w), "253 New track list follows\n");
998 while(*tracks) {
999 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1000 **tracks == '.' ? "." : "", *tracks);
1001 ++tracks;
1002 }
1003 sink_writes(ev_writer_sink(c->w), ".\n");
1004 return 1; /* completed */
1005
1006}
1007
ca831831
RK
1008static int c_rtp_address(struct conn *c,
1009 char attribute((unused)) **vec,
1010 int attribute((unused)) nvec) {
1011 if(config->speaker_backend == BACKEND_NETWORK) {
1012 sink_printf(ev_writer_sink(c->w), "252 %s %s\n",
1013 quoteutf8(config->broadcast.s[0]),
1014 quoteutf8(config->broadcast.s[1]));
1015 } else
1016 sink_writes(ev_writer_sink(c->w), "550 No RTP\n");
1017 return 1;
1018}
b12be54a
RK
1019
1020static int c_cookie(struct conn *c,
1021 char **vec,
1022 int attribute((unused)) nvec) {
1023 const char *host;
1024 char *user;
eb5dc014 1025 rights_type rights;
b12be54a
RK
1026
1027 /* Can't log in twice on the same connection */
1028 if(c->who) {
1029 sink_writes(ev_writer_sink(c->w), "530 already authenticated\n");
1030 return 1;
1031 }
1032 /* Get some kind of peer identifcation */
1033 if(!(host = connection_host(c))) {
1034 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1035 return 1;
1036 }
1037 /* Check the cookie */
eb5dc014 1038 user = verify_cookie(vec[0], &rights);
b12be54a
RK
1039 if(!user) {
1040 sink_writes(ev_writer_sink(c->w), "530 authentication failure\n");
1041 return 1;
1042 }
1043 /* Log in */
eb5dc014 1044 c->who = vec[0];
b12be54a 1045 c->cookie = vec[0];
eb5dc014
RK
1046 c->rights = rights;
1047 if(strcmp(host, "local")) {
b12be54a 1048 info("S%x %s connected with cookie from %s", c->tag, user, host);
eb5dc014
RK
1049 c->rights |= RIGHT__LOCAL;
1050 }
0227f67d
RK
1051 /* Response contains username so client knows who they are acting as */
1052 sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user));
b12be54a
RK
1053 return 1;
1054}
1055
1056static int c_make_cookie(struct conn *c,
1057 char attribute((unused)) **vec,
1058 int attribute((unused)) nvec) {
1059 const char *cookie = make_cookie(c->who);
1060
1061 if(cookie)
eb5dc014 1062 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cookie));
b12be54a
RK
1063 else
1064 sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n");
1065 return 1;
1066}
1067
1068static int c_revoke(struct conn *c,
1069 char attribute((unused)) **vec,
1070 int attribute((unused)) nvec) {
1071 if(c->cookie) {
1072 revoke_cookie(c->cookie);
1073 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1074 } else
1075 sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n");
1076 return 1;
1077}
1078
f0feb22e
RK
1079static int c_adduser(struct conn *c,
1080 char **vec,
0f55e905
RK
1081 int nvec) {
1082 const char *rights;
1083
1084 if(nvec > 2) {
1085 rights = vec[2];
1086 if(parse_rights(vec[2], 0, 1)) {
1087 sink_writes(ev_writer_sink(c->w), "550 Invalid rights list\n");
1088 return -1;
1089 }
1090 } else
1091 rights = config->default_rights;
1092 if(trackdb_adduser(vec[0], vec[1], rights,
ba39faf6 1093 0/*email*/, 0/*confirmation*/))
f0feb22e
RK
1094 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1095 else
1096 sink_writes(ev_writer_sink(c->w), "250 User created\n");
1097 return 1;
1098}
1099
1100static int c_deluser(struct conn *c,
1101 char **vec,
1102 int attribute((unused)) nvec) {
f0feb22e 1103 if(trackdb_deluser(vec[0]))
ba39faf6 1104 sink_writes(ev_writer_sink(c->w), "550 Cannot delete user\n");
f0feb22e
RK
1105 else
1106 sink_writes(ev_writer_sink(c->w), "250 User deleted\n");
1107 return 1;
1108}
1109
1110static int c_edituser(struct conn *c,
5df73aeb 1111 char **vec,
f0feb22e 1112 int attribute((unused)) nvec) {
eb5dc014
RK
1113 /* RIGHT_ADMIN can do anything; otherwise you can only set your own email
1114 * address and password. */
1115 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1116 || (!strcmp(c->who, vec[0])
1117 && (!strcmp(vec[1], "email")
1118 || !strcmp(vec[1], "password")))) {
1119 if(trackdb_edituserinfo(vec[0], vec[1], vec[2]))
1120 sink_writes(ev_writer_sink(c->w), "550 Failed to change setting\n");
1121 else
1122 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1123 } else
1124 sink_writes(ev_writer_sink(c->w), "550 Restricted to administrators\n");
f0feb22e
RK
1125 return 1;
1126}
1127
1128static int c_userinfo(struct conn *c,
1129 char attribute((unused)) **vec,
1130 int attribute((unused)) nvec) {
5df73aeb
RK
1131 struct kvp *k;
1132 const char *value;
eb5dc014
RK
1133
1134 /* RIGHT_ADMIN allows anything; otherwise you can only get your own email
1135 * address and righst list. */
1136 if((c->rights & RIGHT_ADMIN)
5df73aeb
RK
1137 || (!strcmp(c->who, vec[0])
1138 && (!strcmp(vec[1], "email")
1139 || !strcmp(vec[1], "rights")))) {
1140 if((k = trackdb_getuserinfo(vec[0])))
1141 if((value = kvp_get(k, vec[1])))
1142 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(value));
1143 else
1144 sink_writes(ev_writer_sink(c->w), "555 Not set\n");
1145 else
1146 sink_writes(ev_writer_sink(c->w), "550 No such user\n");
1147 } else
1148 sink_writes(ev_writer_sink(c->w), "550 Restricted to administrators\n");
f0feb22e
RK
1149 return 1;
1150}
1151
c3be4f19
RK
1152static int c_users(struct conn *c,
1153 char attribute((unused)) **vec,
1154 int attribute((unused)) nvec) {
1155 /* TODO de-dupe with c_tags */
1156 char **users = trackdb_listusers();
1157
1158 sink_writes(ev_writer_sink(c->w), "253 User list follows\n");
1159 while(*users) {
1160 sink_printf(ev_writer_sink(c->w), "%s%s\n",
1161 **users == '.' ? "." : "", *users);
1162 ++users;
1163 }
1164 sink_writes(ev_writer_sink(c->w), ".\n");
1165 return 1; /* completed */
1166}
1167
ba39faf6
RK
1168static int c_register(struct conn *c,
1169 char **vec,
1170 int attribute((unused)) nvec) {
1171 char *buf, *cs;
1172 size_t bufsize;
1173 int offset;
1174
1175 /* The confirmation string is base64(username;nonce) */
1176 bufsize = strlen(vec[0]) + NONCE_SIZE + 2;
1177 buf = xmalloc_noptr(bufsize);
1178 offset = byte_snprintf(buf, bufsize, "%s;", vec[0]);
1179 gcry_randomize(buf + offset, NONCE_SIZE, GCRY_STRONG_RANDOM);
1180 cs = mime_to_base64((uint8_t *)buf, offset + NONCE_SIZE);
1181 if(trackdb_adduser(vec[0], vec[1], config->default_rights, vec[2], cs))
1182 sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n");
1183 else
1184 sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cs));
1185 return 1;
1186}
1187
1188static int c_confirm(struct conn *c,
1189 char **vec,
1190 int attribute((unused)) nvec) {
1191 size_t nuser;
1192 char *user, *sep;
1193
1194 if(!(user = mime_base64(vec[0], &nuser))
1195 || !(sep = memchr(user, ';', nuser))) {
1196 sink_writes(ev_writer_sink(c->w), "550 Malformed confirmation string\n");
1197 return 1;
1198 }
1199 *sep = 0;
1200 if(trackdb_confirm(user, vec[0]))
1201 sink_writes(ev_writer_sink(c->w), "550 Incorrect confirmation string\n");
1202 else
1203 sink_writes(ev_writer_sink(c->w), "250 OK\n");
1204 return 1;
1205}
1206
460b9539 1207static const struct command {
eb5dc014 1208 /** @brief Command name */
460b9539 1209 const char *name;
eb5dc014
RK
1210
1211 /** @brief Minimum number of arguments */
1212 int minargs;
1213
1214 /** @brief Maximum number of arguments */
1215 int maxargs;
1216
1217 /** @brief Function to process command */
460b9539 1218 int (*fn)(struct conn *, char **, int);
eb5dc014
RK
1219
1220 /** @brief Rights required to execute command
1221 *
1222 * 0 means that the command can be issued without logging in. If multiple
1223 * bits are listed here any of those rights will do.
1224 */
1225 rights_type rights;
460b9539 1226} commands[] = {
0f55e905 1227 { "adduser", 2, 3, c_adduser, RIGHT_ADMIN|RIGHT__LOCAL },
eb5dc014 1228 { "allfiles", 0, 2, c_allfiles, RIGHT_READ },
ba39faf6 1229 { "confirm", 1, 1, c_confirm, 0 },
b12be54a 1230 { "cookie", 1, 1, c_cookie, 0 },
eb5dc014
RK
1231 { "deluser", 1, 1, c_deluser, RIGHT_ADMIN|RIGHT__LOCAL },
1232 { "dirs", 0, 2, c_dirs, RIGHT_READ },
1233 { "disable", 0, 1, c_disable, RIGHT_GLOBAL_PREFS },
1234 { "edituser", 3, 3, c_edituser, RIGHT_ADMIN|RIGHT_USERINFO },
1235 { "enable", 0, 0, c_enable, RIGHT_GLOBAL_PREFS },
1236 { "enabled", 0, 0, c_enabled, RIGHT_READ },
1237 { "exists", 1, 1, c_exists, RIGHT_READ },
1238 { "files", 0, 2, c_files, RIGHT_READ },
1239 { "get", 2, 2, c_get, RIGHT_READ },
1240 { "get-global", 1, 1, c_get_global, RIGHT_READ },
1241 { "length", 1, 1, c_length, RIGHT_READ },
1242 { "log", 0, 0, c_log, RIGHT_READ },
1243 { "make-cookie", 0, 0, c_make_cookie, RIGHT_READ },
1244 { "move", 2, 2, c_move, RIGHT_MOVE__MASK },
1245 { "moveafter", 1, INT_MAX, c_moveafter, RIGHT_MOVE__MASK },
1246 { "new", 0, 1, c_new, RIGHT_READ },
1247 { "nop", 0, 0, c_nop, 0 },
1248 { "part", 3, 3, c_part, RIGHT_READ },
1249 { "pause", 0, 0, c_pause, RIGHT_PAUSE },
1250 { "play", 1, 1, c_play, RIGHT_PLAY },
1251 { "playing", 0, 0, c_playing, RIGHT_READ },
1252 { "prefs", 1, 1, c_prefs, RIGHT_READ },
1253 { "queue", 0, 0, c_queue, RIGHT_READ },
1254 { "random-disable", 0, 0, c_random_disable, RIGHT_GLOBAL_PREFS },
1255 { "random-enable", 0, 0, c_random_enable, RIGHT_GLOBAL_PREFS },
1256 { "random-enabled", 0, 0, c_random_enabled, RIGHT_READ },
1257 { "recent", 0, 0, c_recent, RIGHT_READ },
1258 { "reconfigure", 0, 0, c_reconfigure, RIGHT_ADMIN },
ba39faf6 1259 { "register", 3, 3, c_register, RIGHT_REGISTER|RIGHT__LOCAL },
eb5dc014
RK
1260 { "remove", 1, 1, c_remove, RIGHT_REMOVE__MASK },
1261 { "rescan", 0, 0, c_rescan, RIGHT_RESCAN },
1262 { "resolve", 1, 1, c_resolve, RIGHT_READ },
1263 { "resume", 0, 0, c_resume, RIGHT_PAUSE },
1264 { "revoke", 0, 0, c_revoke, RIGHT_READ },
1265 { "rtp-address", 0, 0, c_rtp_address, 0 },
1266 { "scratch", 0, 1, c_scratch, RIGHT_SCRATCH__MASK },
1267 { "search", 1, 1, c_search, RIGHT_READ },
1268 { "set", 3, 3, c_set, RIGHT_PREFS, },
1269 { "set-global", 2, 2, c_set_global, RIGHT_GLOBAL_PREFS },
1270 { "shutdown", 0, 0, c_shutdown, RIGHT_ADMIN },
1271 { "stats", 0, 0, c_stats, RIGHT_READ },
1272 { "tags", 0, 0, c_tags, RIGHT_READ },
1273 { "unset", 2, 2, c_set, RIGHT_PREFS },
1274 { "unset-global", 1, 1, c_set_global, RIGHT_GLOBAL_PREFS },
460b9539 1275 { "user", 2, 2, c_user, 0 },
eb5dc014
RK
1276 { "userinfo", 2, 2, c_userinfo, RIGHT_READ },
1277 { "users", 0, 0, c_users, RIGHT_READ },
1278 { "version", 0, 0, c_version, RIGHT_READ },
1279 { "volume", 0, 2, c_volume, RIGHT_READ|RIGHT_VOLUME }
460b9539 1280};
1281
1282static void command_error(const char *msg, void *u) {
1283 struct conn *c = u;
1284
1285 sink_printf(ev_writer_sink(c->w), "500 parse error: %s\n", msg);
1286}
1287
1288/* process a command. Return 1 if complete, 0 if incomplete. */
1289static int command(struct conn *c, char *line) {
1290 char **vec;
1291 int nvec, n;
1292
1293 D(("server command %s", line));
f9635e06
RK
1294 /* We force everything into NFC as early as possible */
1295 if(!(line = utf8_compose_canon(line, strlen(line), 0))) {
1296 sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n");
1297 return 1;
1298 }
460b9539 1299 if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) {
1300 sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n");
1301 return 1;
1302 }
1303 if(nvec == 0) {
1304 sink_writes(ev_writer_sink(c->w), "500 do what?\n");
1305 return 1;
1306 }
1307 if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0)
1308 sink_writes(ev_writer_sink(c->w), "500 unknown command\n");
1309 else {
eb5dc014
RK
1310 if(commands[n].rights
1311 && !(c->rights & commands[n].rights)) {
1312 sink_writes(ev_writer_sink(c->w), "530 Prohibited\n");
460b9539 1313 return 1;
1314 }
1315 ++vec;
1316 --nvec;
1317 if(nvec < commands[n].minargs) {
1318 sink_writes(ev_writer_sink(c->w), "500 missing argument(s)\n");
1319 return 1;
1320 }
1321 if(nvec > commands[n].maxargs) {
1322 sink_writes(ev_writer_sink(c->w), "500 too many arguments\n");
1323 return 1;
1324 }
1325 return commands[n].fn(c, vec, nvec);
1326 }
1327 return 1; /* completed */
1328}
1329
1330/* redirect to the right reader callback for our current state */
1331static int redirect_reader_callback(ev_source *ev,
1332 ev_reader *reader,
460b9539 1333 void *ptr,
1334 size_t bytes,
1335 int eof,
1336 void *u) {
1337 struct conn *c = u;
1338
75d64210 1339 return c->reader(ev, reader, ptr, bytes, eof, u);
460b9539 1340}
1341
1342/* the main command reader */
1343static int reader_callback(ev_source attribute((unused)) *ev,
1344 ev_reader *reader,
460b9539 1345 void *ptr,
1346 size_t bytes,
1347 int eof,
1348 void *u) {
1349 struct conn *c = u;
1350 char *eol;
1351 int complete;
1352
1353 D(("server reader_callback"));
1354 while((eol = memchr(ptr, '\n', bytes))) {
1355 *eol++ = 0;
1356 ev_reader_consume(reader, eol - (char *)ptr);
1357 complete = command(c, ptr);
1358 bytes -= (eol - (char *)ptr);
1359 ptr = eol;
1360 if(!complete) {
1361 /* the command had better have set a new reader callback */
1362 if(bytes || eof)
1363 /* there are further bytes to read, or we are at eof; arrange for the
1364 * command's reader callback to handle them */
1365 return ev_reader_incomplete(reader);
1366 /* nothing's going on right now */
1367 return 0;
1368 }
1369 /* command completed, we can go around and handle the next one */
1370 }
1371 if(eof) {
1372 if(bytes)
1373 error(0, "S%x unterminated line", c->tag);
8d8b8c1f 1374 D(("normal reader close"));
397ef7bb
RK
1375 c->r = 0;
1376 if(c->w) {
8d8b8c1f 1377 D(("close associated writer"));
397ef7bb
RK
1378 ev_writer_close(c->w);
1379 c->w = 0;
1380 }
460b9539 1381 }
1382 return 0;
1383}
1384
1385static int listen_callback(ev_source *ev,
1386 int fd,
1387 const struct sockaddr attribute((unused)) *remote,
1388 socklen_t attribute((unused)) rlen,
1389 void *u) {
1390 const struct listener *l = u;
1391 struct conn *c = xmalloc(sizeof *c);
1392 static unsigned tags;
1393
1394 D(("server listen_callback fd %d (%s)", fd, l->name));
1395 nonblock(fd);
1396 cloexec(fd);
1397 c->tag = tags++;
1398 c->ev = ev;
e8c92ba7
RK
1399 c->w = ev_writer_new(ev, fd, writer_error, c,
1400 "client writer");
1401 c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c,
1402 "client reader");
75d64210 1403 ev_tie(c->r, c->w);
460b9539 1404 c->fd = fd;
1405 c->reader = reader_callback;
1406 c->l = l;
eb5dc014 1407 c->rights = 0;
460b9539 1408 gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM);
7b32e917
RK
1409 sink_printf(ev_writer_sink(c->w), "231 %d %s %s\n",
1410 2,
b3141726
RK
1411 config->authorization_algorithm,
1412 hex(c->nonce, sizeof c->nonce));
460b9539 1413 return 0;
1414}
1415
1416int server_start(ev_source *ev, int pf,
1417 size_t socklen, const struct sockaddr *sa,
1418 const char *name) {
1419 int fd;
1420 struct listener *l = xmalloc(sizeof *l);
1421 static const int one = 1;
1422
1423 D(("server_init socket %s", name));
1424 fd = xsocket(pf, SOCK_STREAM, 0);
1425 xsetsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
1426 if(bind(fd, sa, socklen) < 0) {
1427 error(errno, "error binding to %s", name);
1428 return -1;
1429 }
1430 xlisten(fd, 128);
1431 nonblock(fd);
1432 cloexec(fd);
1433 l->name = name;
1434 l->pf = pf;
e8c92ba7
RK
1435 if(ev_listen(ev, fd, listen_callback, l, "server listener"))
1436 exit(EXIT_FAILURE);
460b9539 1437 return fd;
1438}
1439
1440int server_stop(ev_source *ev, int fd) {
1441 xclose(fd);
1442 return ev_listen_cancel(ev, fd);
1443}
1444
1445/*
1446Local Variables:
1447c-basic-offset:2
1448comment-column:40
1449fill-column:79
1450End:
1451*/