mdw@git.distorted.org.uk Git - disorder/blob - lib/client.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004-2009 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 3 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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU 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, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/client.c
  19  * @brief Simple C client
  20  *
  21  * See @ref lib/eclient.c for an asynchronous-capable client
  22  * implementation.
  23  */
  24
  25 #include "common.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <netinet/in.h>
  30 #include <sys/un.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <netdb.h>
  34 #include <pcre.h>
  35
  36 #include "log.h"
  37 #include "mem.h"
  38 #include "queue.h"
  39 #include "client.h"
  40 #include "charset.h"
  41 #include "hex.h"
  42 #include "split.h"
  43 #include "vector.h"
  44 #include "inputline.h"
  45 #include "kvp.h"
  46 #include "syscalls.h"
  47 #include "printf.h"
  48 #include "sink.h"
  49 #include "addr.h"
  50 #include "authhash.h"
  51 #include "client-common.h"
  52 #include "rights.h"
  53 #include "trackdb.h"
  54 #include "kvp.h"
  55
  56 /** @brief Client handle contents */
  57 struct disorder_client {
  58   /** @brief Stream to read from */
  59   FILE *fpin;
  60   /** @brief Stream to write to */
  61   FILE *fpout;
  62   /** @brief Peer description */
  63   char *ident;
  64   /** @brief Username */
  65   char *user;
  66   /** @brief Report errors to @c stderr */
  67   int verbose;
  68   /** @brief Last error string */
  69   const char *last;
  70 };
  71
  72 /** @brief Create a new client
  73  * @param verbose If nonzero, write extra junk to stderr
  74  * @return Pointer to new client
  75  *
  76  * You must call disorder_connect(), disorder_connect_user() or
  77  * disorder_connect_cookie() to connect it.  Use disorder_close() to
  78  * dispose of the client when finished with it.
  79  */
  80 disorder_client *disorder_new(int verbose) {
  81   disorder_client *c = xmalloc(sizeof (struct disorder_client));
  82
  83   c->verbose = verbose;
  84   return c;
  85 }
  86
  87 /** @brief Read a response line
  88  * @param c Client
  89  * @param rp Where to store response, or NULL (UTF-8)
  90  * @return Response code 0-999 or -1 on error
  91  */
  92 static int response(disorder_client *c, char **rp) {
  93   char *r;
  94
  95   if(inputline(c->ident, c->fpin, &r, '\n')) {
  96     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
  97     return -1;
  98   }
  99   D(("response: %s", r));
 100   if(rp)
 101     *rp = r;
 102   if(r[0] >= '0' && r[0] <= '9'
 103      && r[1] >= '0' && r[1] <= '9'
 104      && r[2] >= '0' && r[2] <= '9'
 105      && r[3] == ' ') {
 106     c->last = r + 4;
 107     return (r[0] * 10 + r[1]) * 10 + r[2] - 111 * '0';
 108   } else {
 109     c->last = "invalid reply format";
 110     disorder_error(0, "invalid reply format from %s", c->ident);
 111     return -1;
 112   }
 113 }
 114
 115 /** @brief Return last response string
 116  * @param c Client
 117  * @return Last response string (UTF-8, English) or NULL
 118  */
 119 const char *disorder_last(disorder_client *c) {
 120   return c->last;
 121 }
 122
 123 /** @brief Read and partially parse a response
 124  * @param c Client
 125  * @param rp Where to store response text (or NULL) (UTF-8)
 126  * @return 0 on success, non-0 on error
 127  *
 128  * 5xx responses count as errors.
 129  *
 130  * @p rp will NOT be filled in for xx9 responses (where it is just
 131  * commentary for a command where it would normally be meaningful).
 132  *
 133  * NB that the response will NOT be converted to the local encoding.
 134  */
 135 static int check_response(disorder_client *c, char **rp) {
 136   int rc;
 137   char *r;
 138
 139   if((rc = response(c, &r)) == -1)
 140     return -1;
 141   else if(rc / 100 == 2) {
 142     if(rp)
 143       *rp = (rc % 10 == 9) ? 0 : xstrdup(r + 4);
 144     xfree(r);
 145     return 0;
 146   } else {
 147     if(c->verbose)
 148       disorder_error(0, "from %s: %s", c->ident, utf82mb(r));
 149     xfree(r);
 150     return rc;
 151   }
 152 }
 153
 154 /** @brief Issue a command and parse a simple response
 155  * @param c Client
 156  * @param rp Where to store result, or NULL
 157  * @param cmd Command
 158  * @param body Body or NULL
 159  * @param nbody Length of body or -1
 160  * @param ap Arguments (UTF-8), terminated by (char *)0
 161  * @return 0 on success, non-0 on error
 162  *
 163  * 5xx responses count as errors.
 164  *
 165  * @p rp will NOT be filled in for xx9 responses (where it is just
 166  * commentary for a command where it would normally be meaningful).
 167  *
 168  * NB that the response will NOT be converted to the local encoding
 169  * nor will quotes be stripped.  See dequote().
 170  *
 171  * If @p body is not NULL then the body is sent immediately after the
 172  * command.  @p nbody should be the number of lines or @c -1 to count
 173  * them if @p body is NULL-terminated.
 174  *
 175  * Usually you would call this via one of the following interfaces:
 176  * - disorder_simple()
 177  * - disorder_simple_body()
 178  * - disorder_simple_list()
 179  */
 180 static int disorder_simple_v(disorder_client *c,
 181                              char **rp,
 182                              const char *cmd,
 183                              char **body, int nbody,
 184                              va_list ap) {
 185   const char *arg;
 186   struct dynstr d;
 187
 188   if(!c->fpout) {
 189     c->last = "not connected";
 190     disorder_error(0, "not connected to server");
 191     return -1;
 192   }
 193   if(cmd) {
 194     dynstr_init(&d);
 195     dynstr_append_string(&d, cmd);
 196     while((arg = va_arg(ap, const char *))) {
 197       dynstr_append(&d, ' ');
 198       dynstr_append_string(&d, quoteutf8(arg));
 199     }
 200     dynstr_append(&d, '\n');
 201     dynstr_terminate(&d);
 202     D(("command: %s", d.vec));
 203     if(fputs(d.vec, c->fpout) < 0)
 204       goto write_error;
 205     xfree(d.vec);
 206     if(body) {
 207       if(nbody < 0)
 208         for(nbody = 0; body[nbody]; ++nbody)
 209           ;
 210       for(int n = 0; n < nbody; ++n) {
 211         if(body[n][0] == '.')
 212           if(fputc('.', c->fpout) < 0)
 213             goto write_error;
 214         if(fputs(body[n], c->fpout) < 0)
 215           goto write_error;
 216         if(fputc('\n', c->fpout) < 0)
 217           goto write_error;
 218       }
 219       if(fputs(".\n", c->fpout) < 0)
 220         goto write_error;
 221     }
 222     if(fflush(c->fpout))
 223       goto write_error;
 224   }
 225   return check_response(c, rp);
 226 write_error:
 227   byte_xasprintf((char **)&c->last, "write error: %s", strerror(errno));
 228   disorder_error(errno, "error writing to %s", c->ident);
 229   return -1;
 230 }
 231
 232 /** @brief Issue a command and parse a simple response
 233  * @param c Client
 234  * @param rp Where to store result, or NULL (UTF-8)
 235  * @param cmd Command
 236  * @return 0 on success, non-0 on error
 237  *
 238  * The remaining arguments are command arguments, terminated by (char
 239  * *)0.  They should be in UTF-8.
 240  *
 241  * 5xx responses count as errors.
 242  *
 243  * @p rp will NOT be filled in for xx9 responses (where it is just
 244  * commentary for a command where it would normally be meaningful).
 245  *
 246  * NB that the response will NOT be converted to the local encoding
 247  * nor will quotes be stripped.  See dequote().
 248  */
 249 static int disorder_simple(disorder_client *c,
 250                            char **rp,
 251                            const char *cmd, ...) {
 252   va_list ap;
 253   int ret;
 254
 255   va_start(ap, cmd);
 256   ret = disorder_simple_v(c, rp, cmd, 0, 0, ap);
 257   va_end(ap);
 258   return ret;
 259 }
 260
 261 /** @brief Issue a command with a body and parse a simple response
 262  * @param c Client
 263  * @param rp Where to store result, or NULL (UTF-8)
 264  * @param body Pointer to body
 265  * @param nbody Size of body
 266  * @param cmd Command
 267  * @return 0 on success, non-0 on error
 268  *
 269  * See disorder_simple().
 270  */
 271 static int disorder_simple_body(disorder_client *c,
 272                                 char **rp,
 273                                 char **body, int nbody,
 274                                 const char *cmd, ...) {
 275   va_list ap;
 276   int ret;
 277
 278   va_start(ap, cmd);
 279   ret = disorder_simple_v(c, rp, cmd, body, nbody, ap);
 280   va_end(ap);
 281   return ret;
 282 }
 283
 284 /** @brief Dequote a result string
 285  * @param rc 0 on success, non-0 on error
 286  * @param rp Where result string is stored (UTF-8)
 287  * @return @p rc
 288  *
 289  * This is used as a wrapper around disorder_simple() to dequote
 290  * results in place.
 291  */
 292 static int dequote(int rc, char **rp) {
 293   char **rr;
 294
 295   if(!rc) {
 296     if((rr = split(*rp, 0, SPLIT_QUOTES, 0, 0)) && *rr) {
 297       xfree(*rp);
 298       *rp = *rr;
 299       xfree(rr);
 300       return 0;
 301     }
 302     disorder_error(0, "invalid reply: %s", *rp);
 303   }
 304   return rc;
 305 }
 306
 307 /** @brief Generic connection routine
 308  * @param conf Configuration to follow
 309  * @param c Client
 310  * @param username Username to log in with or NULL
 311  * @param password Password to log in with or NULL
 312  * @param cookie Cookie to log in with or NULL
 313  * @return 0 on success, non-0 on error
 314  *
 315  * @p cookie is tried first if not NULL.  If it is NULL then @p
 316  * username must not be.  If @p username is not NULL then nor may @p
 317  * password be.
 318  */
 319 int disorder_connect_generic(struct config *conf,
 320                              disorder_client *c,
 321                              const char *username,
 322                              const char *password,
 323                              const char *cookie) {
 324   int fd = -1, fd2 = -1, nrvec = 0, rc;
 325   unsigned char *nonce = NULL;
 326   size_t nl;
 327   char *res = NULL;
 328   char *r = NULL, **rvec = NULL;
 329   const char *protocol, *algorithm, *challenge;
 330   struct sockaddr *sa = NULL;
 331   socklen_t salen;
 332
 333   if((salen = find_server(conf, &sa, &c->ident)) == (socklen_t)-1)
 334     return -1;
 335   c->fpin = c->fpout = 0;
 336   if((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) {
 337     byte_xasprintf((char **)&c->last, "socket: %s", strerror(errno));
 338     disorder_error(errno, "error calling socket");
 339     return -1;
 340   }
 341   if(connect(fd, sa, salen) < 0) {
 342     byte_xasprintf((char **)&c->last, "connect: %s", strerror(errno));
 343     disorder_error(errno, "error calling connect");
 344     goto error;
 345   }
 346   if((fd2 = dup(fd)) < 0) {
 347     byte_xasprintf((char **)&c->last, "dup: %s", strerror(errno));
 348     disorder_error(errno, "error calling dup");
 349     goto error;
 350   }
 351   if(!(c->fpin = fdopen(fd, "rb"))) {
 352     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 353     disorder_error(errno, "error calling fdopen");
 354     goto error;
 355   }
 356   fd = -1;
 357   if(!(c->fpout = fdopen(fd2, "wb"))) {
 358     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 359     disorder_error(errno, "error calling fdopen");
 360     goto error;
 361   }
 362   fd2 = -1;
 363   if((rc = disorder_simple(c, &r, 0, (const char *)0)))
 364     goto error_rc;
 365   if(!(rvec = split(r, &nrvec, SPLIT_QUOTES, 0, 0)))
 366     goto error;
 367   if(nrvec != 3) {
 368     c->last = "cannot parse server greeting";
 369     disorder_error(0, "cannot parse server greeting %s", r);
 370     goto error;
 371   }
 372   protocol = rvec[0];
 373   if(strcmp(protocol, "2")) {
 374     c->last = "unknown protocol version";
 375     disorder_error(0, "unknown protocol version: %s", protocol);
 376     goto error;
 377   }
 378   algorithm = rvec[1];
 379   challenge = rvec[2];
 380   if(!(nonce = unhex(challenge, &nl)))
 381     goto error;
 382   if(cookie) {
 383     if(!dequote(disorder_simple(c, &c->user, "cookie", cookie, (char *)0),
 384                 &c->user))
 385       return 0;                         /* success */
 386     if(!username) {
 387       c->last = "cookie failed and no username";
 388       disorder_error(0, "cookie did not work and no username available");
 389       goto error;
 390     }
 391   }
 392   if(!(res = authhash(nonce, nl, password, algorithm))) {
 393     c->last = "error computing authorization hash";
 394     goto error;
 395   }
 396   if((rc = disorder_simple(c, 0, "user", username, res, (char *)0)))
 397     goto error_rc;
 398   c->user = xstrdup(username);
 399   xfree(res);
 400   free_strings(nrvec, rvec);
 401   xfree(nonce);
 402   xfree(sa);
 403   xfree(r);
 404   return 0;
 405 error:
 406   rc = -1;
 407 error_rc:
 408   if(c->fpin) {
 409     fclose(c->fpin);
 410     c->fpin = 0;
 411   }
 412   if(c->fpout) {
 413     fclose(c->fpout);
 414     c->fpout = 0;
 415   }
 416   if(fd2 != -1) close(fd2);
 417   if(fd != -1) close(fd);
 418   return rc;
 419 }
 420
 421 /** @brief Connect a client with a specified username and password
 422  * @param c Client
 423  * @param username Username to log in with
 424  * @param password Password to log in with
 425  * @return 0 on success, non-0 on error
 426  */
 427 int disorder_connect_user(disorder_client *c,
 428                           const char *username,
 429                           const char *password) {
 430   return disorder_connect_generic(config,
 431                                   c,
 432                                   username,
 433                                   password,
 434                                   0);
 435 }
 436
 437 /** @brief Connect a client
 438  * @param c Client
 439  * @return 0 on success, non-0 on error
 440  *
 441  * The connection will use the username and password found in @ref
 442  * config, or directly from the database if no password is found and
 443  * the database is readable (usually only for root).
 444  */
 445 int disorder_connect(disorder_client *c) {
 446   const char *username, *password;
 447
 448   if(!(username = config->username)) {
 449     c->last = "no username";
 450     disorder_error(0, "no username configured");
 451     return -1;
 452   }
 453   password = config->password;
 454   /* Maybe we can read the database */
 455   if(!password && trackdb_readable()) {
 456     trackdb_init(TRACKDB_NO_RECOVER|TRACKDB_NO_UPGRADE);
 457     trackdb_open(TRACKDB_READ_ONLY);
 458     password = trackdb_get_password(username);
 459     trackdb_close();
 460   }
 461   if(!password) {
 462     /* Oh well */
 463     c->last = "no password";
 464     disorder_error(0, "no password configured for user '%s'", username);
 465     return -1;
 466   }
 467   return disorder_connect_generic(config,
 468                                   c,
 469                                   username,
 470                                   password,
 471                                   0);
 472 }
 473
 474 /** @brief Connect a client
 475  * @param c Client
 476  * @param cookie Cookie to log in with, or NULL
 477  * @return 0 on success, non-0 on error
 478  *
 479  * If @p cookie is NULL or does not work then we attempt to log in as
 480  * guest instead (so when the cookie expires only an extra round trip
 481  * is needed rathre than a complete new login).
 482  */
 483 int disorder_connect_cookie(disorder_client *c,
 484                             const char *cookie) {
 485   return disorder_connect_generic(config,
 486                                   c,
 487                                   "guest",
 488                                   "",
 489                                   cookie);
 490 }
 491
 492 /** @brief Close a client
 493  * @param c Client
 494  * @return 0 on succcess, non-0 on errior
 495  *
 496  * The client is still closed even on error.  It might well be
 497  * appropriate to ignore the return value.
 498  */
 499 int disorder_close(disorder_client *c) {
 500   int ret = 0;
 501
 502   if(c->fpin) {
 503     if(fclose(c->fpin) < 0) {
 504       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 505       disorder_error(errno, "error calling fclose");
 506       ret = -1;
 507     }
 508     c->fpin = 0;
 509   }
 510   if(c->fpout) {
 511     if(fclose(c->fpout) < 0) {
 512       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 513       disorder_error(errno, "error calling fclose");
 514       ret = -1;
 515     }
 516     c->fpout = 0;
 517   }
 518   xfree(c->ident);
 519   c->ident = 0;
 520   xfree(c->user);
 521   c->user = 0;
 522   return 0;
 523 }
 524
 525 /** @brief Play a track
 526  * @param c Client
 527  * @param track Track to play (UTF-8)
 528  * @return 0 on success, non-0 on error
 529  */
 530 int disorder_play(disorder_client *c, const char *track) {
 531   return disorder_simple(c, 0, "play", track, (char *)0);
 532 }
 533
 534 /** @brief Remove a track
 535  * @param c Client
 536  * @param track Track to remove (UTF-8)
 537  * @return 0 on success, non-0 on error
 538  */
 539 int disorder_remove(disorder_client *c, const char *track) {
 540   return disorder_simple(c, 0, "remove", track, (char *)0);
 541 }
 542
 543 /** @brief Move a track
 544  * @param c Client
 545  * @param track Track to move (UTF-8)
 546  * @param delta Distance to move by
 547  * @return 0 on success, non-0 on error
 548  */
 549 int disorder_move(disorder_client *c, const char *track, int delta) {
 550   char d[16];
 551
 552   byte_snprintf(d, sizeof d, "%d", delta);
 553   return disorder_simple(c, 0, "move", track, d, (char *)0);
 554 }
 555
 556 /** @brief Enable play
 557  * @param c Client
 558  * @return 0 on success, non-0 on error
 559  */
 560 int disorder_enable(disorder_client *c) {
 561   return disorder_simple(c, 0, "enable", (char *)0);
 562 }
 563
 564 /** @brief Disable play
 565  * @param c Client
 566  * @return 0 on success, non-0 on error
 567  */
 568 int disorder_disable(disorder_client *c) {
 569   return disorder_simple(c, 0, "disable", (char *)0);
 570 }
 571
 572 /** @brief Scratch the currently playing track
 573  * @param id Playing track ID or NULL (UTF-8)
 574  * @param c Client
 575  * @return 0 on success, non-0 on error
 576  */
 577 int disorder_scratch(disorder_client *c, const char *id) {
 578   return disorder_simple(c, 0, "scratch", id, (char *)0);
 579 }
 580
 581 /** @brief Shut down the server
 582  * @param c Client
 583  * @return 0 on success, non-0 on error
 584  */
 585 int disorder_shutdown(disorder_client *c) {
 586   return disorder_simple(c, 0, "shutdown", (char *)0);
 587 }
 588
 589 /** @brief Make the server re-read its configuration
 590  * @param c Client
 591  * @return 0 on success, non-0 on error
 592  */
 593 int disorder_reconfigure(disorder_client *c) {
 594   return disorder_simple(c, 0, "reconfigure", (char *)0);
 595 }
 596
 597 /** @brief Rescan tracks
 598  * @param c Client
 599  * @return 0 on success, non-0 on error
 600  */
 601 int disorder_rescan(disorder_client *c) {
 602   return disorder_simple(c, 0, "rescan", (char *)0);
 603 }
 604
 605 /** @brief Get server version number
 606  * @param c Client
 607  * @param rp Where to store version string (UTF-8)
 608  * @return 0 on success, non-0 on error
 609  */
 610 int disorder_version(disorder_client *c, char **rp) {
 611   return dequote(disorder_simple(c, rp, "version", (char *)0), rp);
 612 }
 613
 614 static void client_error(const char *msg,
 615                          void attribute((unused)) *u) {
 616   disorder_error(0, "error parsing reply: %s", msg);
 617 }
 618
 619 /** @brief Get currently playing track
 620  * @param c Client
 621  * @param qp Where to store track information
 622  * @return 0 on success, non-0 on error
 623  *
 624  * @p qp gets NULL if no track is playing.
 625  */
 626 int disorder_playing(disorder_client *c, struct queue_entry **qp) {
 627   char *r;
 628   struct queue_entry *q;
 629   int rc;
 630
 631   if((rc = disorder_simple(c, &r, "playing", (char *)0)))
 632     return rc;
 633   if(r) {
 634     q = xmalloc(sizeof *q);
 635     if(queue_unmarshall(q, r, client_error, 0))
 636       return -1;
 637     *qp = q;
 638   } else
 639     *qp = 0;
 640   return 0;
 641 }
 642
 643 /** @brief Fetch the queue, recent list, etc */
 644 static int disorder_somequeue(disorder_client *c,
 645                               const char *cmd, struct queue_entry **qp) {
 646   struct queue_entry *qh, **qt = &qh, *q;
 647   char *l;
 648   int rc;
 649
 650   if((rc = disorder_simple(c, 0, cmd, (char *)0)))
 651     return rc;
 652   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 653     if(!strcmp(l, ".")) {
 654       *qt = 0;
 655       *qp = qh;
 656       xfree(l);
 657       return 0;
 658     }
 659     q = xmalloc(sizeof *q);
 660     if(!queue_unmarshall(q, l, client_error, 0)) {
 661       *qt = q;
 662       qt = &q->next;
 663     }
 664     xfree(l);
 665   }
 666   if(ferror(c->fpin)) {
 667     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 668     disorder_error(errno, "error reading %s", c->ident);
 669   } else {
 670     c->last = "input error: unexpxected EOF";
 671     disorder_error(0, "error reading %s: unexpected EOF", c->ident);
 672   }
 673   return -1;
 674 }
 675
 676 /** @brief Get recently played tracks
 677  * @param c Client
 678  * @param qp Where to store track information
 679  * @return 0 on success, non-0 on error
 680  *
 681  * The last entry in the list is the most recently played track.
 682  */
 683 int disorder_recent(disorder_client *c, struct queue_entry **qp) {
 684   return disorder_somequeue(c, "recent", qp);
 685 }
 686
 687 /** @brief Get queue
 688  * @param c Client
 689  * @param qp Where to store track information
 690  * @return 0 on success, non-0 on error
 691  *
 692  * The first entry in the list will be played next.
 693  */
 694 int disorder_queue(disorder_client *c, struct queue_entry **qp) {
 695   return disorder_somequeue(c, "queue", qp);
 696 }
 697
 698 /** @brief Read a dot-stuffed list
 699  * @param c Client
 700  * @param vecp Where to store list (UTF-8)
 701  * @param nvecp Where to store number of items, or NULL
 702  * @return 0 on success, non-0 on error
 703  *
 704  * The list will have a final NULL not counted in @p nvecp.
 705  */
 706 static int readlist(disorder_client *c, char ***vecp, int *nvecp) {
 707   char *l;
 708   struct vector v;
 709
 710   vector_init(&v);
 711   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 712     if(!strcmp(l, ".")) {
 713       vector_terminate(&v);
 714       if(nvecp)
 715         *nvecp = v.nvec;
 716       *vecp = v.vec;
 717       xfree(l);
 718       return 0;
 719     }
 720     vector_append(&v, xstrdup(l + (*l == '.')));
 721     xfree(l);
 722   }
 723   if(ferror(c->fpin)) {
 724     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 725     disorder_error(errno, "error reading %s", c->ident);
 726   } else {
 727     c->last = "input error: unexpxected EOF";
 728     disorder_error(0, "error reading %s: unexpected EOF", c->ident);
 729   }
 730   return -1;
 731 }
 732
 733 /** @brief Issue a comamnd and get a list response
 734  * @param c Client
 735  * @param vecp Where to store list (UTF-8)
 736  * @param nvecp Where to store number of items, or NULL
 737  * @param cmd Command
 738  * @return 0 on success, non-0 on error
 739  *
 740  * The remaining arguments are command arguments, terminated by (char
 741  * *)0.  They should be in UTF-8.
 742  *
 743  * 5xx responses count as errors.
 744  *
 745  * See disorder_simple().
 746  */
 747 static int disorder_simple_list(disorder_client *c,
 748                                 char ***vecp, int *nvecp,
 749                                 const char *cmd, ...) {
 750   va_list ap;
 751   int ret;
 752
 753   va_start(ap, cmd);
 754   ret = disorder_simple_v(c, 0, cmd, 0, 0, ap);
 755   va_end(ap);
 756   if(ret) return ret;
 757   return readlist(c, vecp, nvecp);
 758 }
 759
 760 /** @brief List directories below @p dir
 761  * @param c Client
 762  * @param dir Directory to list, or NULL for root (UTF-8)
 763  * @param re Regexp that results must match, or NULL (UTF-8)
 764  * @param vecp Where to store list (UTF-8)
 765  * @param nvecp Where to store number of items, or NULL
 766  * @return 0 on success, non-0 on error
 767  */
 768 int disorder_directories(disorder_client *c, const char *dir, const char *re,
 769                          char ***vecp, int *nvecp) {
 770   return disorder_simple_list(c, vecp, nvecp, "dirs", dir, re, (char *)0);
 771 }
 772
 773 /** @brief List files below @p dir
 774  * @param c Client
 775  * @param dir Directory to list, or NULL for root (UTF-8)
 776  * @param re Regexp that results must match, or NULL (UTF-8)
 777  * @param vecp Where to store list (UTF-8)
 778  * @param nvecp Where to store number of items, or NULL
 779  * @return 0 on success, non-0 on error
 780  */
 781 int disorder_files(disorder_client *c, const char *dir, const char *re,
 782                    char ***vecp, int *nvecp) {
 783   return disorder_simple_list(c, vecp, nvecp, "files", dir, re, (char *)0);
 784 }
 785
 786 /** @brief List files and directories below @p dir
 787  * @param c Client
 788  * @param dir Directory to list, or NULL for root (UTF-8)
 789  * @param re Regexp that results must match, or NULL (UTF-8)
 790  * @param vecp Where to store list (UTF-8)
 791  * @param nvecp Where to store number of items, or NULL
 792  * @return 0 on success, non-0 on error
 793  */
 794 int disorder_allfiles(disorder_client *c, const char *dir, const char *re,
 795                       char ***vecp, int *nvecp) {
 796   return disorder_simple_list(c, vecp, nvecp, "allfiles", dir, re, (char *)0);
 797 }
 798
 799 /** @brief Return the user we logged in with
 800  * @param c Client
 801  * @return User name (owned by @p c, don't modify)
 802  */
 803 char *disorder_user(disorder_client *c) {
 804   return c->user;
 805 }
 806
 807 /** @brief Set a track preference
 808  * @param c Client
 809  * @param track Track name (UTF-8)
 810  * @param key Preference name (UTF-8)
 811  * @param value Preference value (UTF-8)
 812  * @return 0 on success, non-0 on error
 813  */
 814 int disorder_set(disorder_client *c, const char *track,
 815                  const char *key, const char *value) {
 816   return disorder_simple(c, 0, "set", track, key, value, (char *)0);
 817 }
 818
 819 /** @brief Unset a track preference
 820  * @param c Client
 821  * @param track Track name (UTF-8)
 822  * @param key Preference name (UTF-8)
 823  * @return 0 on success, non-0 on error
 824  */
 825 int disorder_unset(disorder_client *c, const char *track,
 826                    const char *key) {
 827   return disorder_simple(c, 0, "unset", track, key, (char *)0);
 828 }
 829
 830 /** @brief Get a track preference
 831  * @param c Client
 832  * @param track Track name (UTF-8)
 833  * @param key Preference name (UTF-8)
 834  * @param valuep Where to store preference value (UTF-8)
 835  * @return 0 on success, non-0 on error
 836  */
 837 int disorder_get(disorder_client *c,
 838                  const char *track, const char *key, char **valuep) {
 839   return dequote(disorder_simple(c, valuep, "get", track, key, (char *)0),
 840                  valuep);
 841 }
 842
 843 static void pref_error_handler(const char *msg,
 844                                void attribute((unused)) *u) {
 845   disorder_error(0, "error handling 'prefs' reply: %s", msg);
 846 }
 847
 848 /** @brief Get all preferences for a trcak
 849  * @param c Client
 850  * @param track Track name
 851  * @param kp Where to store linked list of preferences
 852  * @return 0 on success, non-0 on error
 853  */
 854 int disorder_prefs(disorder_client *c, const char *track, struct kvp **kp) {
 855   char **vec, **pvec;
 856   int nvec, npvec, n, rc;
 857   struct kvp *k;
 858
 859   if((rc = disorder_simple_list(c, &vec, &nvec, "prefs", track, (char *)0)))
 860     return rc;
 861   for(n = 0; n < nvec; ++n) {
 862     if(!(pvec = split(vec[n], &npvec, SPLIT_QUOTES, pref_error_handler, 0)))
 863       return -1;
 864     if(npvec != 2) {
 865       pref_error_handler("malformed response", 0);
 866       return -1;
 867     }
 868     *kp = k = xmalloc(sizeof *k);
 869     k->name = pvec[0];
 870     k->value = pvec[1];
 871     kp = &k->next;
 872   }
 873   *kp = 0;
 874   return 0;
 875 }
 876
 877 /** @brief Parse a boolean response
 878  * @param cmd Command for use in error messsage
 879  * @param value Result from server
 880  * @param flagp Where to store result
 881  * @return 0 on success, non-0 on error
 882  */
 883 static int boolean(const char *cmd, const char *value,
 884                    int *flagp) {
 885   if(!strcmp(value, "yes")) *flagp = 1;
 886   else if(!strcmp(value, "no")) *flagp = 0;
 887   else {
 888     disorder_error(0, "malformed response to '%s'", cmd);
 889     return -1;
 890   }
 891   return 0;
 892 }
 893
 894 /** @brief Test whether a track exists
 895  * @param c Client
 896  * @param track Track name (UTF-8)
 897  * @param existsp Where to store result (non-0 iff does exist)
 898  * @return 0 on success, non-0 on error
 899  */
 900 int disorder_exists(disorder_client *c, const char *track, int *existsp) {
 901   char *v;
 902   int rc;
 903
 904   if((rc = disorder_simple(c, &v, "exists", track, (char *)0)))
 905     return rc;
 906   return boolean("exists", v, existsp);
 907 }
 908
 909 /** @brief Test whether playing is enabled
 910  * @param c Client
 911  * @param enabledp Where to store result (non-0 iff enabled)
 912  * @return 0 on success, non-0 on error
 913  */
 914 int disorder_enabled(disorder_client *c, int *enabledp) {
 915   char *v;
 916   int rc;
 917
 918   if((rc = disorder_simple(c, &v, "enabled", (char *)0)))
 919     return rc;
 920   return boolean("enabled", v, enabledp);
 921 }
 922
 923 /** @brief Get the length of a track
 924  * @param c Client
 925  * @param track Track name (UTF-8)
 926  * @param valuep Where to store length in seconds
 927  * @return 0 on success, non-0 on error
 928  *
 929  * If the length is unknown 0 is returned.
 930  */
 931 int disorder_length(disorder_client *c, const char *track,
 932                     long *valuep) {
 933   char *value;
 934   int rc;
 935
 936   if((rc = disorder_simple(c, &value, "length", track, (char *)0)))
 937     return rc;
 938   *valuep = atol(value);
 939   return 0;
 940 }
 941
 942 /** @brief Search for tracks
 943  * @param c Client
 944  * @param terms Search terms (UTF-8)
 945  * @param vecp Where to store list (UTF-8)
 946  * @param nvecp Where to store number of items, or NULL
 947  * @return 0 on success, non-0 on error
 948  */
 949 int disorder_search(disorder_client *c, const char *terms,
 950                     char ***vecp, int *nvecp) {
 951   return disorder_simple_list(c, vecp, nvecp, "search", terms, (char *)0);
 952 }
 953
 954 /** @brief Enable random play
 955  * @param c Client
 956  * @return 0 on success, non-0 on error
 957  */
 958 int disorder_random_enable(disorder_client *c) {
 959   return disorder_simple(c, 0, "random-enable", (char *)0);
 960 }
 961
 962 /** @brief Disable random play
 963  * @param c Client
 964  * @return 0 on success, non-0 on error
 965  */
 966 int disorder_random_disable(disorder_client *c) {
 967   return disorder_simple(c, 0, "random-disable", (char *)0);
 968 }
 969
 970 /** @brief Test whether random play is enabled
 971  * @param c Client
 972  * @param enabledp Where to store result (non-0 iff enabled)
 973  * @return 0 on success, non-0 on error
 974  */
 975 int disorder_random_enabled(disorder_client *c, int *enabledp) {
 976   char *v;
 977   int rc;
 978
 979   if((rc = disorder_simple(c, &v, "random-enabled", (char *)0)))
 980     return rc;
 981   return boolean("random-enabled", v, enabledp);
 982 }
 983
 984 /** @brief Get server stats
 985  * @param c Client
 986  * @param vecp Where to store list (UTF-8)
 987  * @param nvecp Where to store number of items, or NULL
 988  * @return 0 on success, non-0 on error
 989  */
 990 int disorder_stats(disorder_client *c,
 991                    char ***vecp, int *nvecp) {
 992   return disorder_simple_list(c, vecp, nvecp, "stats", (char *)0);
 993 }
 994
 995 /** @brief Set volume
 996  * @param c Client
 997  * @param left New left channel value
 998  * @param right New right channel value
 999  * @return 0 on success, non-0 on error
1000  */
1001 int disorder_set_volume(disorder_client *c, int left, int right) {
1002   char *ls, *rs;
1003
1004   if(byte_asprintf(&ls, "%d", left) < 0
1005      || byte_asprintf(&rs, "%d", right) < 0)
1006     return -1;
1007   return disorder_simple(c, 0, "volume", ls, rs, (char *)0);
1008 }
1009
1010 /** @brief Get volume
1011  * @param c Client
1012  * @param left Where to store left channel value
1013  * @param right Where to store right channel value
1014  * @return 0 on success, non-0 on error
1015  */
1016 int disorder_get_volume(disorder_client *c, int *left, int *right) {
1017   char *r;
1018   int rc;
1019
1020   if((rc = disorder_simple(c, &r, "volume", (char *)0)))
1021     return rc;
1022   if(sscanf(r, "%d %d", left, right) != 2) {
1023     c->last = "malformed volume response";
1024     disorder_error(0, "error parsing response to 'volume': '%s'", r);
1025     return -1;
1026   }
1027   return 0;
1028 }
1029
1030 /** @brief Log to a sink
1031  * @param c Client
1032  * @param s Sink to write log lines to
1033  * @return 0 on success, non-0 on error
1034  */
1035 int disorder_log(disorder_client *c, struct sink *s) {
1036   char *l;
1037   int rc;
1038
1039   if((rc = disorder_simple(c, 0, "log", (char *)0)))
1040     return rc;
1041   while(inputline(c->ident, c->fpin, &l, '\n') >= 0 && strcmp(l, "."))
1042     if(sink_printf(s, "%s\n", l) < 0) return -1;
1043   if(ferror(c->fpin) || feof(c->fpin)) {
1044     byte_xasprintf((char **)&c->last, "input error: %s",
1045                    ferror(c->fpin) ? strerror(errno) : "unexpxected EOF");
1046     return -1;
1047   }
1048   return 0;
1049 }
1050
1051 /** @brief Look up a track name part
1052  * @param c Client
1053  * @param partp Where to store result (UTF-8)
1054  * @param track Track name (UTF-8)
1055  * @param context Context (usually "sort" or "display") (UTF-8)
1056  * @param part Track part (UTF-8)
1057  * @return 0 on success, non-0 on error
1058  */
1059 int disorder_part(disorder_client *c, char **partp,
1060                   const char *track, const char *context, const char *part) {
1061   return dequote(disorder_simple(c, partp, "part",
1062                                  track, context, part, (char *)0), partp);
1063 }
1064
1065 /** @brief Resolve aliases
1066  * @param c Client
1067  * @param trackp Where to store canonical name (UTF-8)
1068  * @param track Track name (UTF-8)
1069  * @return 0 on success, non-0 on error
1070  */
1071 int disorder_resolve(disorder_client *c, char **trackp, const char *track) {
1072   return dequote(disorder_simple(c, trackp, "resolve", track, (char *)0),
1073                  trackp);
1074 }
1075
1076 /** @brief Pause the current track
1077  * @param c Client
1078  * @return 0 on success, non-0 on error
1079  */
1080 int disorder_pause(disorder_client *c) {
1081   return disorder_simple(c, 0, "pause", (char *)0);
1082 }
1083
1084 /** @brief Resume the current track
1085  * @param c Client
1086  * @return 0 on success, non-0 on error
1087  */
1088 int disorder_resume(disorder_client *c) {
1089   return disorder_simple(c, 0, "resume", (char *)0);
1090 }
1091
1092 /** @brief List all known tags
1093  * @param c Client
1094  * @param vecp Where to store list (UTF-8)
1095  * @param nvecp Where to store number of items, or NULL
1096  * @return 0 on success, non-0 on error
1097  */
1098 int disorder_tags(disorder_client *c,
1099                    char ***vecp, int *nvecp) {
1100   return disorder_simple_list(c, vecp, nvecp, "tags", (char *)0);
1101 }
1102
1103 /** @brief List all known users
1104  * @param c Client
1105  * @param vecp Where to store list (UTF-8)
1106  * @param nvecp Where to store number of items, or NULL
1107  * @return 0 on success, non-0 on error
1108  */
1109 int disorder_users(disorder_client *c,
1110                    char ***vecp, int *nvecp) {
1111   return disorder_simple_list(c, vecp, nvecp, "users", (char *)0);
1112 }
1113
1114 /** @brief Get recently added tracks
1115  * @param c Client
1116  * @param vecp Where to store pointer to list (UTF-8)
1117  * @param nvecp Where to store count
1118  * @param max Maximum tracks to fetch, or 0 for all available
1119  * @return 0 on success, non-0 on error
1120  */
1121 int disorder_new_tracks(disorder_client *c,
1122                         char ***vecp, int *nvecp,
1123                         int max) {
1124   char limit[32];
1125
1126   sprintf(limit, "%d", max);
1127   return disorder_simple_list(c, vecp, nvecp, "new", limit, (char *)0);
1128 }
1129
1130 /** @brief Set a global preference
1131  * @param c Client
1132  * @param key Preference name (UTF-8)
1133  * @param value Preference value (UTF-8)
1134  * @return 0 on success, non-0 on error
1135  */
1136 int disorder_set_global(disorder_client *c,
1137                         const char *key, const char *value) {
1138   return disorder_simple(c, 0, "set-global", key, value, (char *)0);
1139 }
1140
1141 /** @brief Unset a global preference
1142  * @param c Client
1143  * @param key Preference name (UTF-8)
1144  * @return 0 on success, non-0 on error
1145  */
1146 int disorder_unset_global(disorder_client *c, const char *key) {
1147   return disorder_simple(c, 0, "unset-global", key, (char *)0);
1148 }
1149
1150 /** @brief Get a global preference
1151  * @param c Client
1152  * @param key Preference name (UTF-8)
1153  * @param valuep Where to store preference value (UTF-8)
1154  * @return 0 on success, non-0 on error
1155  */
1156 int disorder_get_global(disorder_client *c, const char *key, char **valuep) {
1157   return dequote(disorder_simple(c, valuep, "get-global", key, (char *)0),
1158                  valuep);
1159 }
1160
1161 /** @brief Get server's RTP address information
1162  * @param c Client
1163  * @param addressp Where to store address (UTF-8)
1164  * @param portp Where to store port (UTF-8)
1165  * @return 0 on success, non-0 on error
1166  */
1167 int disorder_rtp_address(disorder_client *c, char **addressp, char **portp) {
1168   char *r;
1169   int rc, n;
1170   char **vec;
1171
1172   if((rc = disorder_simple(c, &r, "rtp-address", (char *)0)))
1173     return rc;
1174   vec = split(r, &n, SPLIT_QUOTES, 0, 0);
1175   if(n != 2) {
1176     c->last = "malformed RTP address";
1177     disorder_error(0, "malformed rtp-address reply");
1178     return -1;
1179   }
1180   *addressp = vec[0];
1181   *portp = vec[1];
1182   return 0;
1183 }
1184
1185 /** @brief Create a user
1186  * @param c Client
1187  * @param user Username
1188  * @param password Password
1189  * @param rights Initial rights or NULL to use default
1190  * @return 0 on success, non-0 on error
1191  */
1192 int disorder_adduser(disorder_client *c,
1193                      const char *user, const char *password,
1194                      const char *rights) {
1195   return disorder_simple(c, 0, "adduser", user, password, rights, (char *)0);
1196 }
1197
1198 /** @brief Delete a user
1199  * @param c Client
1200  * @param user Username
1201  * @return 0 on success, non-0 on error
1202  */
1203 int disorder_deluser(disorder_client *c, const char *user) {
1204   return disorder_simple(c, 0, "deluser", user, (char *)0);
1205 }
1206
1207 /** @brief Get user information
1208  * @param c Client
1209  * @param user Username
1210  * @param key Property name (UTF-8)
1211  * @param valuep Where to store value (UTF-8)
1212  * @return 0 on success, non-0 on error
1213  */
1214 int disorder_userinfo(disorder_client *c, const char *user, const char *key,
1215                       char **valuep) {
1216   return dequote(disorder_simple(c, valuep, "userinfo", user, key, (char *)0),
1217                  valuep);
1218 }
1219
1220 /** @brief Set user information
1221  * @param c Client
1222  * @param user Username
1223  * @param key Property name (UTF-8)
1224  * @param value New property value (UTF-8)
1225  * @return 0 on success, non-0 on error
1226  */
1227 int disorder_edituser(disorder_client *c, const char *user,
1228                       const char *key, const char *value) {
1229   return disorder_simple(c, 0, "edituser", user, key, value, (char *)0);
1230 }
1231
1232 /** @brief Register a user
1233  * @param c Client
1234  * @param user Username
1235  * @param password Password
1236  * @param email Email address (UTF-8)
1237  * @param confirmp Where to store confirmation string
1238  * @return 0 on success, non-0 on error
1239  */
1240 int disorder_register(disorder_client *c, const char *user,
1241                       const char *password, const char *email,
1242                       char **confirmp) {
1243   return dequote(disorder_simple(c, confirmp, "register",
1244                                  user, password, email, (char *)0),
1245                  confirmp);
1246 }
1247
1248 /** @brief Confirm a user
1249  * @param c Client
1250  * @param confirm Confirmation string
1251  * @return 0 on success, non-0 on error
1252  */
1253 int disorder_confirm(disorder_client *c, const char *confirm) {
1254   char *u;
1255   int rc;
1256
1257   if(!(rc = dequote(disorder_simple(c, &u, "confirm", confirm, (char *)0),
1258                     &u)))
1259     c->user = u;
1260   return rc;
1261 }
1262
1263 /** @brief Make a cookie for this login
1264  * @param c Client
1265  * @param cookiep Where to store cookie string
1266  * @return 0 on success, non-0 on error
1267  */
1268 int disorder_make_cookie(disorder_client *c, char **cookiep) {
1269   return dequote(disorder_simple(c, cookiep, "make-cookie", (char *)0),
1270                  cookiep);
1271 }
1272
1273 /** @brief Revoke the cookie used by this session
1274  * @param c Client
1275  * @return 0 on success, non-0 on error
1276  */
1277 int disorder_revoke(disorder_client *c) {
1278   return disorder_simple(c, 0, "revoke", (char *)0);
1279 }
1280
1281 /** @brief Request a password reminder email
1282  * @param c Client
1283  * @param user Username
1284  * @return 0 on success, non-0 on error
1285  */
1286 int disorder_reminder(disorder_client *c, const char *user) {
1287   return disorder_simple(c, 0, "reminder", user, (char *)0);
1288 }
1289
1290 /** @brief List scheduled events
1291  * @param c Client
1292  * @param idsp Where to put list of event IDs
1293  * @param nidsp Where to put count of event IDs, or NULL
1294  * @return 0 on success, non-0 on error
1295  */
1296 int disorder_schedule_list(disorder_client *c, char ***idsp, int *nidsp) {
1297   return disorder_simple_list(c, idsp, nidsp, "schedule-list", (char *)0);
1298 }
1299
1300 /** @brief Delete a scheduled event
1301  * @param c Client
1302  * @param id Event ID to delete
1303  * @return 0 on success, non-0 on error
1304  */
1305 int disorder_schedule_del(disorder_client *c, const char *id) {
1306   return disorder_simple(c, 0, "schedule-del", id, (char *)0);
1307 }
1308
1309 /** @brief Get details of a scheduled event
1310  * @param c Client
1311  * @param id Event ID
1312  * @param actiondatap Where to put details
1313  * @return 0 on success, non-0 on error
1314  */
1315 int disorder_schedule_get(disorder_client *c, const char *id,
1316                           struct kvp **actiondatap) {
1317   char **lines, **bits;
1318   int rc, nbits;
1319
1320   *actiondatap = 0;
1321   if((rc = disorder_simple_list(c, &lines, NULL,
1322                                 "schedule-get", id, (char *)0)))
1323     return rc;
1324   while(*lines) {
1325     if(!(bits = split(*lines++, &nbits, SPLIT_QUOTES, 0, 0))) {
1326       disorder_error(0, "invalid schedule-get reply: cannot split line");
1327       return -1;
1328     }
1329     if(nbits != 2) {
1330       disorder_error(0, "invalid schedule-get reply: wrong number of fields");
1331       return -1;
1332     }
1333     kvp_set(actiondatap, bits[0], bits[1]);
1334   }
1335   return 0;
1336 }
1337
1338 /** @brief Add a scheduled event
1339  * @param c Client
1340  * @param when When to trigger the event
1341  * @param priority Event priority ("normal" or "junk")
1342  * @param action What action to perform
1343  * @param ... Action-specific arguments
1344  * @return 0 on success, non-0 on error
1345  *
1346  * For action @c "play" the next argument is the track.
1347  *
1348  * For action @c "set-global" next argument is the global preference name
1349  * and the final argument the value to set it to, or (char *)0 to unset it.
1350  */
1351 int disorder_schedule_add(disorder_client *c,
1352                           time_t when,
1353                           const char *priority,
1354                           const char *action,
1355                           ...) {
1356   va_list ap;
1357   char when_str[64];
1358   int rc;
1359
1360   snprintf(when_str, sizeof when_str, "%lld", (long long)when);
1361   va_start(ap, action);
1362   if(!strcmp(action, "play"))
1363     rc = disorder_simple(c, 0, "schedule-add", when_str, priority,
1364                          action, va_arg(ap, char *),
1365                          (char *)0);
1366   else if(!strcmp(action, "set-global")) {
1367     const char *key = va_arg(ap, char *);
1368     const char *value = va_arg(ap, char *);
1369     rc = disorder_simple(c, 0,"schedule-add",  when_str, priority,
1370                          action, key, value,
1371                          (char *)0);
1372   } else
1373     disorder_fatal(0, "unknown action '%s'", action);
1374   va_end(ap);
1375   return rc;
1376 }
1377
1378 /** @brief Adopt a track
1379  * @param c Client
1380  * @param id Track ID to adopt
1381  * @return 0 on success, non-0 on error
1382  */
1383 int disorder_adopt(disorder_client *c, const char *id) {
1384   return disorder_simple(c, 0, "adopt", id, (char *)0);
1385 }
1386
1387 /** @brief Delete a playlist
1388  * @param c Client
1389  * @param playlist Playlist to delete
1390  * @return 0 on success, non-0 on error
1391  */
1392 int disorder_playlist_delete(disorder_client *c,
1393                              const char *playlist) {
1394   return disorder_simple(c, 0, "playlist-delete", playlist, (char *)0);
1395 }
1396
1397 /** @brief Get the contents of a playlist
1398  * @param c Client
1399  * @param playlist Playlist to get
1400  * @param tracksp Where to put list of tracks
1401  * @param ntracksp Where to put count of tracks
1402  * @return 0 on success, non-0 on error
1403  */
1404 int disorder_playlist_get(disorder_client *c, const char *playlist,
1405                           char ***tracksp, int *ntracksp) {
1406   return disorder_simple_list(c, tracksp, ntracksp,
1407                               "playlist-get", playlist, (char *)0);
1408 }
1409
1410 /** @brief List all readable playlists
1411  * @param c Client
1412  * @param playlistsp Where to put list of playlists
1413  * @param nplaylistsp Where to put count of playlists
1414  * @return 0 on success, non-0 on error
1415  */
1416 int disorder_playlists(disorder_client *c,
1417                        char ***playlistsp, int *nplaylistsp) {
1418   return disorder_simple_list(c, playlistsp, nplaylistsp,
1419                               "playlists", (char *)0);
1420 }
1421
1422 /** @brief Get the sharing status of a playlist
1423  * @param c Client
1424  * @param playlist Playlist to inspect
1425  * @param sharep Where to put sharing status
1426  * @return 0 on success, non-0 on error
1427  *
1428  * Possible @p sharep values are @c public, @c private and @c shared.
1429  */
1430 int disorder_playlist_get_share(disorder_client *c, const char *playlist,
1431                                 char **sharep) {
1432   return disorder_simple(c, sharep,
1433                          "playlist-get-share", playlist, (char *)0);
1434 }
1435
1436 /** @brief Get the sharing status of a playlist
1437  * @param c Client
1438  * @param playlist Playlist to modify
1439  * @param share New sharing status
1440  * @return 0 on success, non-0 on error
1441  *
1442  * Possible @p share values are @c public, @c private and @c shared.
1443  */
1444 int disorder_playlist_set_share(disorder_client *c, const char *playlist,
1445                                 const char *share) {
1446   return disorder_simple(c, 0,
1447                          "playlist-set-share", playlist, share, (char *)0);
1448 }
1449
1450 /** @brief Lock a playlist for modifications
1451  * @param c Client
1452  * @param playlist Playlist to lock
1453  * @return 0 on success, non-0 on error
1454  */
1455 int disorder_playlist_lock(disorder_client *c, const char *playlist) {
1456   return disorder_simple(c, 0,
1457                          "playlist-lock", playlist, (char *)0);
1458 }
1459
1460 /** @brief Unlock the locked playlist
1461  * @param c Client
1462  * @return 0 on success, non-0 on error
1463  */
1464 int disorder_playlist_unlock(disorder_client *c) {
1465   return disorder_simple(c, 0,
1466                          "playlist-unlock", (char *)0);
1467 }
1468
1469 /** @brief Set the contents of a playlst
1470  * @param c Client
1471  * @param playlist Playlist to modify
1472  * @param tracks List of tracks
1473  * @param ntracks Length of @p tracks (or -1 to count up to the first NULL)
1474  * @return 0 on success, non-0 on error
1475  */
1476 int disorder_playlist_set(disorder_client *c,
1477                           const char *playlist,
1478                           char **tracks,
1479                           int ntracks) {
1480   return disorder_simple_body(c, 0, tracks, ntracks,
1481                               "playlist-set", playlist, (char *)0);
1482 }
1483
1484 /*
1485 Local Variables:
1486 c-basic-offset:2
1487 comment-column:40
1488 End:
1489 */