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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004-2008 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20 /** @file lib/client.c
  21  * @brief Simple C client
  22  *
  23  * See @ref lib/eclient.c for an asynchronous-capable client
  24  * implementation.
  25  */
  26
  27 #include "common.h"
  28
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <sys/un.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <netdb.h>
  36 #include <pcre.h>
  37
  38 #include "log.h"
  39 #include "mem.h"
  40 #include "queue.h"
  41 #include "client.h"
  42 #include "charset.h"
  43 #include "hex.h"
  44 #include "split.h"
  45 #include "vector.h"
  46 #include "inputline.h"
  47 #include "kvp.h"
  48 #include "syscalls.h"
  49 #include "printf.h"
  50 #include "sink.h"
  51 #include "addr.h"
  52 #include "authhash.h"
  53 #include "client-common.h"
  54 #include "rights.h"
  55 #include "trackdb.h"
  56 #include "kvp.h"
  57
  58 /** @brief Client handle contents */
  59 struct disorder_client {
  60   /** @brief Stream to read from */
  61   FILE *fpin;
  62   /** @brief Stream to write to */
  63   FILE *fpout;
  64   /** @brief Peer description */
  65   char *ident;
  66   /** @brief Username */
  67   char *user;
  68   /** @brief Report errors to @c stderr */
  69   int verbose;
  70   /** @brief Last error string */
  71   const char *last;
  72 };
  73
  74 /** @brief Create a new client
  75  * @param verbose If nonzero, write extra junk to stderr
  76  * @return Pointer to new client
  77  *
  78  * You must call disorder_connect(), disorder_connect_user() or
  79  * disorder_connect_cookie() to connect it.  Use disorder_close() to
  80  * dispose of the client when finished with it.
  81  */
  82 disorder_client *disorder_new(int verbose) {
  83   disorder_client *c = xmalloc(sizeof (struct disorder_client));
  84
  85   c->verbose = verbose;
  86   return c;
  87 }
  88
  89 /** @brief Read a response line
  90  * @param c Client
  91  * @param rp Where to store response, or NULL (UTF-8)
  92  * @return Response code 0-999 or -1 on error
  93  */
  94 static int response(disorder_client *c, char **rp) {
  95   char *r;
  96
  97   if(inputline(c->ident, c->fpin, &r, '\n')) {
  98     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
  99     return -1;
 100   }
 101   D(("response: %s", r));
 102   if(rp)
 103     *rp = r;
 104   if(r[0] >= '0' && r[0] <= '9'
 105      && r[1] >= '0' && r[1] <= '9'
 106      && r[2] >= '0' && r[2] <= '9'
 107      && r[3] == ' ') {
 108     c->last = r + 4;
 109     return (r[0] * 10 + r[1]) * 10 + r[2] - 111 * '0';
 110   } else {
 111     c->last = "invalid reply format";
 112     error(0, "invalid reply format from %s", c->ident);
 113     return -1;
 114   }
 115 }
 116
 117 /** @brief Return last response string
 118  * @param c Client
 119  * @return Last response string (UTF-8, English) or NULL
 120  */
 121 const char *disorder_last(disorder_client *c) {
 122   return c->last;
 123 }
 124
 125 /** @brief Read and partially parse a response
 126  * @param c Client
 127  * @param rp Where to store response text (or NULL) (UTF-8)
 128  * @return 0 on success, non-0 on error
 129  *
 130  * 5xx responses count as errors.
 131  *
 132  * @p rp will NOT be filled in for xx9 responses (where it is just
 133  * commentary for a command where it would normally be meaningful).
 134  *
 135  * NB that the response will NOT be converted to the local encoding.
 136  */
 137 static int check_response(disorder_client *c, char **rp) {
 138   int rc;
 139   char *r;
 140
 141   if((rc = response(c, &r)) == -1)
 142     return -1;
 143   else if(rc / 100 == 2) {
 144     if(rp)
 145       *rp = (rc % 10 == 9) ? 0 : xstrdup(r + 4);
 146     return 0;
 147   } else {
 148     if(c->verbose)
 149       error(0, "from %s: %s", c->ident, utf82mb(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     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     if(body) {
 206       if(nbody < 0)
 207         for(nbody = 0; body[nbody]; ++nbody)
 208           ;
 209       for(int n = 0; n < nbody; ++n) {
 210         if(body[n][0] == '.')
 211           if(fputc('.', c->fpout) < 0)
 212             goto write_error;
 213         if(fputs(body[n], c->fpout) < 0)
 214           goto write_error;
 215         if(fputc('\n', c->fpout) < 0)
 216           goto write_error;
 217       }
 218       if(fputs(".\n", c->fpout) < 0)
 219         goto write_error;
 220     }
 221     if(fflush(c->fpout))
 222       goto write_error;
 223   }
 224   return check_response(c, rp);
 225 write_error:
 226   byte_xasprintf((char **)&c->last, "write error: %s", strerror(errno));
 227   error(errno, "error writing to %s", c->ident);
 228   return -1;
 229 }
 230
 231 /** @brief Issue a command and parse a simple response
 232  * @param c Client
 233  * @param rp Where to store result, or NULL (UTF-8)
 234  * @param cmd Command
 235  * @return 0 on success, non-0 on error
 236  *
 237  * The remaining arguments are command arguments, terminated by (char
 238  * *)0.  They should be in UTF-8.
 239  *
 240  * 5xx responses count as errors.
 241  *
 242  * @p rp will NOT be filled in for xx9 responses (where it is just
 243  * commentary for a command where it would normally be meaningful).
 244  *
 245  * NB that the response will NOT be converted to the local encoding
 246  * nor will quotes be stripped.  See dequote().
 247  */
 248 static int disorder_simple(disorder_client *c,
 249                            char **rp,
 250                            const char *cmd, ...) {
 251   va_list ap;
 252   int ret;
 253
 254   va_start(ap, cmd);
 255   ret = disorder_simple_v(c, rp, cmd, 0, 0, ap);
 256   va_end(ap);
 257   return ret;
 258 }
 259
 260 /** @brief Issue a command with a body and parse a simple response
 261  * @param c Client
 262  * @param rp Where to store result, or NULL (UTF-8)
 263  * @param body Pointer to body
 264  * @param nbody Size of body
 265  * @param cmd Command
 266  * @return 0 on success, non-0 on error
 267  *
 268  * See disorder_simple().
 269  */
 270 static int disorder_simple_body(disorder_client *c,
 271                                 char **rp,
 272                                 char **body, int nbody,
 273                                 const char *cmd, ...) {
 274   va_list ap;
 275   int ret;
 276
 277   va_start(ap, cmd);
 278   ret = disorder_simple_v(c, rp, cmd, body, nbody, ap);
 279   va_end(ap);
 280   return ret;
 281 }
 282
 283 /** @brief Dequote a result string
 284  * @param rc 0 on success, non-0 on error
 285  * @param rp Where result string is stored (UTF-8)
 286  * @return @p rc
 287  *
 288  * This is used as a wrapper around disorder_simple() to dequote
 289  * results in place.
 290  */
 291 static int dequote(int rc, char **rp) {
 292   char **rr;
 293
 294   if(!rc) {
 295     if((rr = split(*rp, 0, SPLIT_QUOTES, 0, 0)) && *rr) {
 296       *rp = *rr;
 297       return 0;
 298     }
 299     error(0, "invalid reply: %s", *rp);
 300   }
 301   return rc;
 302 }
 303
 304 /** @brief Generic connection routine
 305  * @param conf Configuration to follow
 306  * @param c Client
 307  * @param username Username to log in with or NULL
 308  * @param password Password to log in with or NULL
 309  * @param cookie Cookie to log in with or NULL
 310  * @return 0 on success, non-0 on error
 311  *
 312  * @p cookie is tried first if not NULL.  If it is NULL then @p
 313  * username must not be.  If @p username is not NULL then nor may @p
 314  * password be.
 315  */
 316 int disorder_connect_generic(struct config *conf,
 317                              disorder_client *c,
 318                              const char *username,
 319                              const char *password,
 320                              const char *cookie) {
 321   int fd = -1, fd2 = -1, nrvec, rc;
 322   unsigned char *nonce;
 323   size_t nl;
 324   const char *res;
 325   char *r, **rvec;
 326   const char *protocol, *algorithm, *challenge;
 327   struct sockaddr *sa;
 328   socklen_t salen;
 329
 330   if((salen = find_server(conf, &sa, &c->ident)) == (socklen_t)-1)
 331     return -1;
 332   c->fpin = c->fpout = 0;
 333   if((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) {
 334     byte_xasprintf((char **)&c->last, "socket: %s", strerror(errno));
 335     error(errno, "error calling socket");
 336     return -1;
 337   }
 338   if(connect(fd, sa, salen) < 0) {
 339     byte_xasprintf((char **)&c->last, "connect: %s", strerror(errno));
 340     error(errno, "error calling connect");
 341     goto error;
 342   }
 343   if((fd2 = dup(fd)) < 0) {
 344     byte_xasprintf((char **)&c->last, "dup: %s", strerror(errno));
 345     error(errno, "error calling dup");
 346     goto error;
 347   }
 348   if(!(c->fpin = fdopen(fd, "rb"))) {
 349     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 350     error(errno, "error calling fdopen");
 351     goto error;
 352   }
 353   fd = -1;
 354   if(!(c->fpout = fdopen(fd2, "wb"))) {
 355     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 356     error(errno, "error calling fdopen");
 357     goto error;
 358   }
 359   fd2 = -1;
 360   if((rc = disorder_simple(c, &r, 0, (const char *)0)))
 361     goto error_rc;
 362   if(!(rvec = split(r, &nrvec, SPLIT_QUOTES, 0, 0)))
 363     goto error;
 364   if(nrvec != 3) {
 365     c->last = "cannot parse server greeting";
 366     error(0, "cannot parse server greeting %s", r);
 367     goto error;
 368   }
 369   protocol = *rvec++;
 370   if(strcmp(protocol, "2")) {
 371     c->last = "unknown protocol version";
 372     error(0, "unknown protocol version: %s", protocol);
 373     goto error;
 374   }
 375   algorithm = *rvec++;
 376   challenge = *rvec++;
 377   if(!(nonce = unhex(challenge, &nl)))
 378     goto error;
 379   if(cookie) {
 380     if(!dequote(disorder_simple(c, &c->user, "cookie", cookie, (char *)0),
 381                 &c->user))
 382       return 0;                         /* success */
 383     if(!username) {
 384       c->last = "cookie failed and no username";
 385       error(0, "cookie did not work and no username available");
 386       goto error;
 387     }
 388   }
 389   if(!(res = authhash(nonce, nl, password, algorithm))) {
 390     c->last = "error computing authorization hash";
 391     goto error;
 392   }
 393   if((rc = disorder_simple(c, 0, "user", username, res, (char *)0)))
 394     goto error_rc;
 395   c->user = xstrdup(username);
 396   return 0;
 397 error:
 398   rc = -1;
 399 error_rc:
 400   if(c->fpin) {
 401     fclose(c->fpin);
 402     c->fpin = 0;
 403   }
 404   if(c->fpout) {
 405     fclose(c->fpout);
 406     c->fpout = 0;
 407   }
 408   if(fd2 != -1) close(fd2);
 409   if(fd != -1) close(fd);
 410   return rc;
 411 }
 412
 413 /** @brief Connect a client with a specified username and password
 414  * @param c Client
 415  * @param username Username to log in with
 416  * @param password Password to log in with
 417  * @return 0 on success, non-0 on error
 418  */
 419 int disorder_connect_user(disorder_client *c,
 420                           const char *username,
 421                           const char *password) {
 422   return disorder_connect_generic(config,
 423                                   c,
 424                                   username,
 425                                   password,
 426                                   0);
 427 }
 428
 429 /** @brief Connect a client
 430  * @param c Client
 431  * @return 0 on success, non-0 on error
 432  *
 433  * The connection will use the username and password found in @ref
 434  * config, or directly from the database if no password is found and
 435  * the database is readable (usually only for root).
 436  */
 437 int disorder_connect(disorder_client *c) {
 438   const char *username, *password;
 439
 440   if(!(username = config->username)) {
 441     c->last = "no username";
 442     error(0, "no username configured");
 443     return -1;
 444   }
 445   password = config->password;
 446   /* Maybe we can read the database */
 447   if(!password && trackdb_readable()) {
 448     trackdb_init(TRACKDB_NO_RECOVER|TRACKDB_NO_UPGRADE);
 449     trackdb_open(TRACKDB_READ_ONLY);
 450     password = trackdb_get_password(username);
 451     trackdb_close();
 452   }
 453   if(!password) {
 454     /* Oh well */
 455     c->last = "no password";
 456     error(0, "no password configured");
 457     return -1;
 458   }
 459   return disorder_connect_generic(config,
 460                                   c,
 461                                   username,
 462                                   password,
 463                                   0);
 464 }
 465
 466 /** @brief Connect a client
 467  * @param c Client
 468  * @param cookie Cookie to log in with, or NULL
 469  * @return 0 on success, non-0 on error
 470  *
 471  * If @p cookie is NULL or does not work then we attempt to log in as
 472  * guest instead (so when the cookie expires only an extra round trip
 473  * is needed rathre than a complete new login).
 474  */
 475 int disorder_connect_cookie(disorder_client *c,
 476                             const char *cookie) {
 477   return disorder_connect_generic(config,
 478                                   c,
 479                                   "guest",
 480                                   "",
 481                                   cookie);
 482 }
 483
 484 /** @brief Close a client
 485  * @param c Client
 486  * @return 0 on succcess, non-0 on errior
 487  *
 488  * The client is still closed even on error.  It might well be
 489  * appropriate to ignore the return value.
 490  */
 491 int disorder_close(disorder_client *c) {
 492   int ret = 0;
 493
 494   if(c->fpin) {
 495     if(fclose(c->fpin) < 0) {
 496       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 497       error(errno, "error calling fclose");
 498       ret = -1;
 499     }
 500     c->fpin = 0;
 501   }
 502   if(c->fpout) {
 503     if(fclose(c->fpout) < 0) {
 504       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 505       error(errno, "error calling fclose");
 506       ret = -1;
 507     }
 508     c->fpout = 0;
 509   }
 510   c->ident = 0;
 511   c->user = 0;
 512   return 0;
 513 }
 514
 515 /** @brief Play a track
 516  * @param c Client
 517  * @param track Track to play (UTF-8)
 518  * @return 0 on success, non-0 on error
 519  */
 520 int disorder_play(disorder_client *c, const char *track) {
 521   return disorder_simple(c, 0, "play", track, (char *)0);
 522 }
 523
 524 /** @brief Remove a track
 525  * @param c Client
 526  * @param track Track to remove (UTF-8)
 527  * @return 0 on success, non-0 on error
 528  */
 529 int disorder_remove(disorder_client *c, const char *track) {
 530   return disorder_simple(c, 0, "remove", track, (char *)0);
 531 }
 532
 533 /** @brief Move a track
 534  * @param c Client
 535  * @param track Track to move (UTF-8)
 536  * @param delta Distance to move by
 537  * @return 0 on success, non-0 on error
 538  */
 539 int disorder_move(disorder_client *c, const char *track, int delta) {
 540   char d[16];
 541
 542   byte_snprintf(d, sizeof d, "%d", delta);
 543   return disorder_simple(c, 0, "move", track, d, (char *)0);
 544 }
 545
 546 /** @brief Enable play
 547  * @param c Client
 548  * @return 0 on success, non-0 on error
 549  */
 550 int disorder_enable(disorder_client *c) {
 551   return disorder_simple(c, 0, "enable", (char *)0);
 552 }
 553
 554 /** @brief Disable play
 555  * @param c Client
 556  * @return 0 on success, non-0 on error
 557  */
 558 int disorder_disable(disorder_client *c) {
 559   return disorder_simple(c, 0, "disable", (char *)0);
 560 }
 561
 562 /** @brief Scratch the currently playing track
 563  * @param id Playing track ID or NULL (UTF-8)
 564  * @param c Client
 565  * @return 0 on success, non-0 on error
 566  */
 567 int disorder_scratch(disorder_client *c, const char *id) {
 568   return disorder_simple(c, 0, "scratch", id, (char *)0);
 569 }
 570
 571 /** @brief Shut down the server
 572  * @param c Client
 573  * @return 0 on success, non-0 on error
 574  */
 575 int disorder_shutdown(disorder_client *c) {
 576   return disorder_simple(c, 0, "shutdown", (char *)0);
 577 }
 578
 579 /** @brief Make the server re-read its configuration
 580  * @param c Client
 581  * @return 0 on success, non-0 on error
 582  */
 583 int disorder_reconfigure(disorder_client *c) {
 584   return disorder_simple(c, 0, "reconfigure", (char *)0);
 585 }
 586
 587 /** @brief Rescan tracks
 588  * @param c Client
 589  * @return 0 on success, non-0 on error
 590  */
 591 int disorder_rescan(disorder_client *c) {
 592   return disorder_simple(c, 0, "rescan", (char *)0);
 593 }
 594
 595 /** @brief Get server version number
 596  * @param c Client
 597  * @param rp Where to store version string (UTF-8)
 598  * @return 0 on success, non-0 on error
 599  */
 600 int disorder_version(disorder_client *c, char **rp) {
 601   return dequote(disorder_simple(c, rp, "version", (char *)0), rp);
 602 }
 603
 604 static void client_error(const char *msg,
 605                          void attribute((unused)) *u) {
 606   error(0, "error parsing reply: %s", msg);
 607 }
 608
 609 /** @brief Get currently playing track
 610  * @param c Client
 611  * @param qp Where to store track information
 612  * @return 0 on success, non-0 on error
 613  *
 614  * @p qp gets NULL if no track is playing.
 615  */
 616 int disorder_playing(disorder_client *c, struct queue_entry **qp) {
 617   char *r;
 618   struct queue_entry *q;
 619   int rc;
 620
 621   if((rc = disorder_simple(c, &r, "playing", (char *)0)))
 622     return rc;
 623   if(r) {
 624     q = xmalloc(sizeof *q);
 625     if(queue_unmarshall(q, r, client_error, 0))
 626       return -1;
 627     *qp = q;
 628   } else
 629     *qp = 0;
 630   return 0;
 631 }
 632
 633 /** @brief Fetch the queue, recent list, etc */
 634 static int disorder_somequeue(disorder_client *c,
 635                               const char *cmd, struct queue_entry **qp) {
 636   struct queue_entry *qh, **qt = &qh, *q;
 637   char *l;
 638   int rc;
 639
 640   if((rc = disorder_simple(c, 0, cmd, (char *)0)))
 641     return rc;
 642   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 643     if(!strcmp(l, ".")) {
 644       *qt = 0;
 645       *qp = qh;
 646       return 0;
 647     }
 648     q = xmalloc(sizeof *q);
 649     if(!queue_unmarshall(q, l, client_error, 0)) {
 650       *qt = q;
 651       qt = &q->next;
 652     }
 653   }
 654   if(ferror(c->fpin)) {
 655     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 656     error(errno, "error reading %s", c->ident);
 657   } else {
 658     c->last = "input error: unexpxected EOF";
 659     error(0, "error reading %s: unexpected EOF", c->ident);
 660   }
 661   return -1;
 662 }
 663
 664 /** @brief Get recently played tracks
 665  * @param c Client
 666  * @param qp Where to store track information
 667  * @return 0 on success, non-0 on error
 668  *
 669  * The last entry in the list is the most recently played track.
 670  */
 671 int disorder_recent(disorder_client *c, struct queue_entry **qp) {
 672   return disorder_somequeue(c, "recent", qp);
 673 }
 674
 675 /** @brief Get queue
 676  * @param c Client
 677  * @param qp Where to store track information
 678  * @return 0 on success, non-0 on error
 679  *
 680  * The first entry in the list will be played next.
 681  */
 682 int disorder_queue(disorder_client *c, struct queue_entry **qp) {
 683   return disorder_somequeue(c, "queue", qp);
 684 }
 685
 686 /** @brief Read a dot-stuffed list
 687  * @param c Client
 688  * @param vecp Where to store list (UTF-8)
 689  * @param nvecp Where to store number of items, or NULL
 690  * @return 0 on success, non-0 on error
 691  *
 692  * The list will have a final NULL not counted in @p nvecp.
 693  */
 694 static int readlist(disorder_client *c, char ***vecp, int *nvecp) {
 695   char *l;
 696   struct vector v;
 697
 698   vector_init(&v);
 699   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 700     if(!strcmp(l, ".")) {
 701       vector_terminate(&v);
 702       if(nvecp)
 703         *nvecp = v.nvec;
 704       *vecp = v.vec;
 705       return 0;
 706     }
 707     vector_append(&v, l + (*l == '.'));
 708   }
 709   if(ferror(c->fpin)) {
 710     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 711     error(errno, "error reading %s", c->ident);
 712   } else {
 713     c->last = "input error: unexpxected EOF";
 714     error(0, "error reading %s: unexpected EOF", c->ident);
 715   }
 716   return -1;
 717 }
 718
 719 /** @brief Issue a comamnd and get a list response
 720  * @param c Client
 721  * @param vecp Where to store list (UTF-8)
 722  * @param nvecp Where to store number of items, or NULL
 723  * @param cmd Command
 724  * @return 0 on success, non-0 on error
 725  *
 726  * The remaining arguments are command arguments, terminated by (char
 727  * *)0.  They should be in UTF-8.
 728  *
 729  * 5xx responses count as errors.
 730  *
 731  * See disorder_simple().
 732  */
 733 static int disorder_simple_list(disorder_client *c,
 734                                 char ***vecp, int *nvecp,
 735                                 const char *cmd, ...) {
 736   va_list ap;
 737   int ret;
 738
 739   va_start(ap, cmd);
 740   ret = disorder_simple_v(c, 0, cmd, 0, 0, ap);
 741   va_end(ap);
 742   if(ret) return ret;
 743   return readlist(c, vecp, nvecp);
 744 }
 745
 746 /** @brief List directories below @p dir
 747  * @param c Client
 748  * @param dir Directory to list, or NULL for root (UTF-8)
 749  * @param re Regexp that results must match, or NULL (UTF-8)
 750  * @param vecp Where to store list (UTF-8)
 751  * @param nvecp Where to store number of items, or NULL
 752  * @return 0 on success, non-0 on error
 753  */
 754 int disorder_directories(disorder_client *c, const char *dir, const char *re,
 755                          char ***vecp, int *nvecp) {
 756   return disorder_simple_list(c, vecp, nvecp, "dirs", dir, re, (char *)0);
 757 }
 758
 759 /** @brief List files below @p dir
 760  * @param c Client
 761  * @param dir Directory to list, or NULL for root (UTF-8)
 762  * @param re Regexp that results must match, or NULL (UTF-8)
 763  * @param vecp Where to store list (UTF-8)
 764  * @param nvecp Where to store number of items, or NULL
 765  * @return 0 on success, non-0 on error
 766  */
 767 int disorder_files(disorder_client *c, const char *dir, const char *re,
 768                    char ***vecp, int *nvecp) {
 769   return disorder_simple_list(c, vecp, nvecp, "files", dir, re, (char *)0);
 770 }
 771
 772 /** @brief List files and directories below @p dir
 773  * @param c Client
 774  * @param dir Directory to list, or NULL for root (UTF-8)
 775  * @param re Regexp that results must match, or NULL (UTF-8)
 776  * @param vecp Where to store list (UTF-8)
 777  * @param nvecp Where to store number of items, or NULL
 778  * @return 0 on success, non-0 on error
 779  */
 780 int disorder_allfiles(disorder_client *c, const char *dir, const char *re,
 781                       char ***vecp, int *nvecp) {
 782   return disorder_simple_list(c, vecp, nvecp, "allfiles", dir, re, (char *)0);
 783 }
 784
 785 /** @brief Return the user we logged in with
 786  * @param c Client
 787  * @return User name (owned by @p c, don't modify)
 788  */
 789 char *disorder_user(disorder_client *c) {
 790   return c->user;
 791 }
 792
 793 /** @brief Set a track preference
 794  * @param c Client
 795  * @param track Track name (UTF-8)
 796  * @param key Preference name (UTF-8)
 797  * @param value Preference value (UTF-8)
 798  * @return 0 on success, non-0 on error
 799  */
 800 int disorder_set(disorder_client *c, const char *track,
 801                  const char *key, const char *value) {
 802   return disorder_simple(c, 0, "set", track, key, value, (char *)0);
 803 }
 804
 805 /** @brief Unset a track preference
 806  * @param c Client
 807  * @param track Track name (UTF-8)
 808  * @param key Preference name (UTF-8)
 809  * @return 0 on success, non-0 on error
 810  */
 811 int disorder_unset(disorder_client *c, const char *track,
 812                    const char *key) {
 813   return disorder_simple(c, 0, "unset", track, key, (char *)0);
 814 }
 815
 816 /** @brief Get a track preference
 817  * @param c Client
 818  * @param track Track name (UTF-8)
 819  * @param key Preference name (UTF-8)
 820  * @param valuep Where to store preference value (UTF-8)
 821  * @return 0 on success, non-0 on error
 822  */
 823 int disorder_get(disorder_client *c,
 824                  const char *track, const char *key, char **valuep) {
 825   return dequote(disorder_simple(c, valuep, "get", track, key, (char *)0),
 826                  valuep);
 827 }
 828
 829 static void pref_error_handler(const char *msg,
 830                                void attribute((unused)) *u) {
 831   error(0, "error handling 'prefs' reply: %s", msg);
 832 }
 833
 834 /** @brief Get all preferences for a trcak
 835  * @param c Client
 836  * @param track Track name
 837  * @param kp Where to store linked list of preferences
 838  * @return 0 on success, non-0 on error
 839  */
 840 int disorder_prefs(disorder_client *c, const char *track, struct kvp **kp) {
 841   char **vec, **pvec;
 842   int nvec, npvec, n, rc;
 843   struct kvp *k;
 844
 845   if((rc = disorder_simple_list(c, &vec, &nvec, "prefs", track, (char *)0)))
 846     return rc;
 847   for(n = 0; n < nvec; ++n) {
 848     if(!(pvec = split(vec[n], &npvec, SPLIT_QUOTES, pref_error_handler, 0)))
 849       return -1;
 850     if(npvec != 2) {
 851       pref_error_handler("malformed response", 0);
 852       return -1;
 853     }
 854     *kp = k = xmalloc(sizeof *k);
 855     k->name = pvec[0];
 856     k->value = pvec[1];
 857     kp = &k->next;
 858   }
 859   *kp = 0;
 860   return 0;
 861 }
 862
 863 /** @brief Parse a boolean response
 864  * @param cmd Command for use in error messsage
 865  * @param value Result from server
 866  * @param flagp Where to store result
 867  * @return 0 on success, non-0 on error
 868  */
 869 static int boolean(const char *cmd, const char *value,
 870                    int *flagp) {
 871   if(!strcmp(value, "yes")) *flagp = 1;
 872   else if(!strcmp(value, "no")) *flagp = 0;
 873   else {
 874     error(0, "malformed response to '%s'", cmd);
 875     return -1;
 876   }
 877   return 0;
 878 }
 879
 880 /** @brief Test whether a track exists
 881  * @param c Client
 882  * @param track Track name (UTF-8)
 883  * @param existsp Where to store result (non-0 iff does exist)
 884  * @return 0 on success, non-0 on error
 885  */
 886 int disorder_exists(disorder_client *c, const char *track, int *existsp) {
 887   char *v;
 888   int rc;
 889
 890   if((rc = disorder_simple(c, &v, "exists", track, (char *)0)))
 891     return rc;
 892   return boolean("exists", v, existsp);
 893 }
 894
 895 /** @brief Test whether playing is enabled
 896  * @param c Client
 897  * @param enabledp Where to store result (non-0 iff enabled)
 898  * @return 0 on success, non-0 on error
 899  */
 900 int disorder_enabled(disorder_client *c, int *enabledp) {
 901   char *v;
 902   int rc;
 903
 904   if((rc = disorder_simple(c, &v, "enabled", (char *)0)))
 905     return rc;
 906   return boolean("enabled", v, enabledp);
 907 }
 908
 909 /** @brief Get the length of a track
 910  * @param c Client
 911  * @param track Track name (UTF-8)
 912  * @param valuep Where to store length in seconds
 913  * @return 0 on success, non-0 on error
 914  *
 915  * If the length is unknown 0 is returned.
 916  */
 917 int disorder_length(disorder_client *c, const char *track,
 918                     long *valuep) {
 919   char *value;
 920   int rc;
 921
 922   if((rc = disorder_simple(c, &value, "length", track, (char *)0)))
 923     return rc;
 924   *valuep = atol(value);
 925   return 0;
 926 }
 927
 928 /** @brief Search for tracks
 929  * @param c Client
 930  * @param terms Search terms (UTF-8)
 931  * @param vecp Where to store list (UTF-8)
 932  * @param nvecp Where to store number of items, or NULL
 933  * @return 0 on success, non-0 on error
 934  */
 935 int disorder_search(disorder_client *c, const char *terms,
 936                     char ***vecp, int *nvecp) {
 937   return disorder_simple_list(c, vecp, nvecp, "search", terms, (char *)0);
 938 }
 939
 940 /** @brief Enable random play
 941  * @param c Client
 942  * @return 0 on success, non-0 on error
 943  */
 944 int disorder_random_enable(disorder_client *c) {
 945   return disorder_simple(c, 0, "random-enable", (char *)0);
 946 }
 947
 948 /** @brief Disable random play
 949  * @param c Client
 950  * @return 0 on success, non-0 on error
 951  */
 952 int disorder_random_disable(disorder_client *c) {
 953   return disorder_simple(c, 0, "random-disable", (char *)0);
 954 }
 955
 956 /** @brief Test whether random play is enabled
 957  * @param c Client
 958  * @param enabledp Where to store result (non-0 iff enabled)
 959  * @return 0 on success, non-0 on error
 960  */
 961 int disorder_random_enabled(disorder_client *c, int *enabledp) {
 962   char *v;
 963   int rc;
 964
 965   if((rc = disorder_simple(c, &v, "random-enabled", (char *)0)))
 966     return rc;
 967   return boolean("random-enabled", v, enabledp);
 968 }
 969
 970 /** @brief Get server stats
 971  * @param c Client
 972  * @param vecp Where to store list (UTF-8)
 973  * @param nvecp Where to store number of items, or NULL
 974  * @return 0 on success, non-0 on error
 975  */
 976 int disorder_stats(disorder_client *c,
 977                    char ***vecp, int *nvecp) {
 978   return disorder_simple_list(c, vecp, nvecp, "stats", (char *)0);
 979 }
 980
 981 /** @brief Set volume
 982  * @param c Client
 983  * @param left New left channel value
 984  * @param right New right channel value
 985  * @return 0 on success, non-0 on error
 986  */
 987 int disorder_set_volume(disorder_client *c, int left, int right) {
 988   char *ls, *rs;
 989
 990   if(byte_asprintf(&ls, "%d", left) < 0
 991      || byte_asprintf(&rs, "%d", right) < 0)
 992     return -1;
 993   return disorder_simple(c, 0, "volume", ls, rs, (char *)0);
 994 }
 995
 996 /** @brief Get volume
 997  * @param c Client
 998  * @param left Where to store left channel value
 999  * @param right Where to store right channel value
1000  * @return 0 on success, non-0 on error
1001  */
1002 int disorder_get_volume(disorder_client *c, int *left, int *right) {
1003   char *r;
1004   int rc;
1005
1006   if((rc = disorder_simple(c, &r, "volume", (char *)0)))
1007     return rc;
1008   if(sscanf(r, "%d %d", left, right) != 2) {
1009     c->last = "malformed volume response";
1010     error(0, "error parsing response to 'volume': '%s'", r);
1011     return -1;
1012   }
1013   return 0;
1014 }
1015
1016 /** @brief Log to a sink
1017  * @param c Client
1018  * @param s Sink to write log lines to
1019  * @return 0 on success, non-0 on error
1020  */
1021 int disorder_log(disorder_client *c, struct sink *s) {
1022   char *l;
1023   int rc;
1024
1025   if((rc = disorder_simple(c, 0, "log", (char *)0)))
1026     return rc;
1027   while(inputline(c->ident, c->fpin, &l, '\n') >= 0 && strcmp(l, "."))
1028     if(sink_printf(s, "%s\n", l) < 0) return -1;
1029   if(ferror(c->fpin) || feof(c->fpin)) {
1030     byte_xasprintf((char **)&c->last, "input error: %s",
1031                    ferror(c->fpin) ? strerror(errno) : "unexpxected EOF");
1032     return -1;
1033   }
1034   return 0;
1035 }
1036
1037 /** @brief Look up a track name part
1038  * @param c Client
1039  * @param partp Where to store result (UTF-8)
1040  * @param track Track name (UTF-8)
1041  * @param context Context (usually "sort" or "display") (UTF-8)
1042  * @param part Track part (UTF-8)
1043  * @return 0 on success, non-0 on error
1044  */
1045 int disorder_part(disorder_client *c, char **partp,
1046                   const char *track, const char *context, const char *part) {
1047   return dequote(disorder_simple(c, partp, "part",
1048                                  track, context, part, (char *)0), partp);
1049 }
1050
1051 /** @brief Resolve aliases
1052  * @param c Client
1053  * @param trackp Where to store canonical name (UTF-8)
1054  * @param track Track name (UTF-8)
1055  * @return 0 on success, non-0 on error
1056  */
1057 int disorder_resolve(disorder_client *c, char **trackp, const char *track) {
1058   return dequote(disorder_simple(c, trackp, "resolve", track, (char *)0),
1059                  trackp);
1060 }
1061
1062 /** @brief Pause the current track
1063  * @param c Client
1064  * @return 0 on success, non-0 on error
1065  */
1066 int disorder_pause(disorder_client *c) {
1067   return disorder_simple(c, 0, "pause", (char *)0);
1068 }
1069
1070 /** @brief Resume the current track
1071  * @param c Client
1072  * @return 0 on success, non-0 on error
1073  */
1074 int disorder_resume(disorder_client *c) {
1075   return disorder_simple(c, 0, "resume", (char *)0);
1076 }
1077
1078 /** @brief List all known tags
1079  * @param c Client
1080  * @param vecp Where to store list (UTF-8)
1081  * @param nvecp Where to store number of items, or NULL
1082  * @return 0 on success, non-0 on error
1083  */
1084 int disorder_tags(disorder_client *c,
1085                    char ***vecp, int *nvecp) {
1086   return disorder_simple_list(c, vecp, nvecp, "tags", (char *)0);
1087 }
1088
1089 /** @brief List all known users
1090  * @param c Client
1091  * @param vecp Where to store list (UTF-8)
1092  * @param nvecp Where to store number of items, or NULL
1093  * @return 0 on success, non-0 on error
1094  */
1095 int disorder_users(disorder_client *c,
1096                    char ***vecp, int *nvecp) {
1097   return disorder_simple_list(c, vecp, nvecp, "users", (char *)0);
1098 }
1099
1100 /** @brief Get recently added tracks
1101  * @param c Client
1102  * @param vecp Where to store pointer to list (UTF-8)
1103  * @param nvecp Where to store count
1104  * @param max Maximum tracks to fetch, or 0 for all available
1105  * @return 0 on success, non-0 on error
1106  */
1107 int disorder_new_tracks(disorder_client *c,
1108                         char ***vecp, int *nvecp,
1109                         int max) {
1110   char limit[32];
1111
1112   sprintf(limit, "%d", max);
1113   return disorder_simple_list(c, vecp, nvecp, "new", limit, (char *)0);
1114 }
1115
1116 /** @brief Set a global preference
1117  * @param c Client
1118  * @param key Preference name (UTF-8)
1119  * @param value Preference value (UTF-8)
1120  * @return 0 on success, non-0 on error
1121  */
1122 int disorder_set_global(disorder_client *c,
1123                         const char *key, const char *value) {
1124   return disorder_simple(c, 0, "set-global", key, value, (char *)0);
1125 }
1126
1127 /** @brief Unset a global preference
1128  * @param c Client
1129  * @param key Preference name (UTF-8)
1130  * @return 0 on success, non-0 on error
1131  */
1132 int disorder_unset_global(disorder_client *c, const char *key) {
1133   return disorder_simple(c, 0, "unset-global", key, (char *)0);
1134 }
1135
1136 /** @brief Get a global preference
1137  * @param c Client
1138  * @param key Preference name (UTF-8)
1139  * @param valuep Where to store preference value (UTF-8)
1140  * @return 0 on success, non-0 on error
1141  */
1142 int disorder_get_global(disorder_client *c, const char *key, char **valuep) {
1143   return dequote(disorder_simple(c, valuep, "get-global", key, (char *)0),
1144                  valuep);
1145 }
1146
1147 /** @brief Get server's RTP address information
1148  * @param c Client
1149  * @param addressp Where to store address (UTF-8)
1150  * @param portp Where to store port (UTF-8)
1151  * @return 0 on success, non-0 on error
1152  */
1153 int disorder_rtp_address(disorder_client *c, char **addressp, char **portp) {
1154   char *r;
1155   int rc, n;
1156   char **vec;
1157
1158   if((rc = disorder_simple(c, &r, "rtp-address", (char *)0)))
1159     return rc;
1160   vec = split(r, &n, SPLIT_QUOTES, 0, 0);
1161   if(n != 2) {
1162     c->last = "malformed RTP address";
1163     error(0, "malformed rtp-address reply");
1164     return -1;
1165   }
1166   *addressp = vec[0];
1167   *portp = vec[1];
1168   return 0;
1169 }
1170
1171 /** @brief Create a user
1172  * @param c Client
1173  * @param user Username
1174  * @param password Password
1175  * @param rights Initial rights or NULL to use default
1176  * @return 0 on success, non-0 on error
1177  */
1178 int disorder_adduser(disorder_client *c,
1179                      const char *user, const char *password,
1180                      const char *rights) {
1181   return disorder_simple(c, 0, "adduser", user, password, rights, (char *)0);
1182 }
1183
1184 /** @brief Delete a user
1185  * @param c Client
1186  * @param user Username
1187  * @return 0 on success, non-0 on error
1188  */
1189 int disorder_deluser(disorder_client *c, const char *user) {
1190   return disorder_simple(c, 0, "deluser", user, (char *)0);
1191 }
1192
1193 /** @brief Get user information
1194  * @param c Client
1195  * @param user Username
1196  * @param key Property name (UTF-8)
1197  * @param valuep Where to store value (UTF-8)
1198  * @return 0 on success, non-0 on error
1199  */
1200 int disorder_userinfo(disorder_client *c, const char *user, const char *key,
1201                       char **valuep) {
1202   return dequote(disorder_simple(c, valuep, "userinfo", user, key, (char *)0),
1203                  valuep);
1204 }
1205
1206 /** @brief Set user information
1207  * @param c Client
1208  * @param user Username
1209  * @param key Property name (UTF-8)
1210  * @param value New property value (UTF-8)
1211  * @return 0 on success, non-0 on error
1212  */
1213 int disorder_edituser(disorder_client *c, const char *user,
1214                       const char *key, const char *value) {
1215   return disorder_simple(c, 0, "edituser", user, key, value, (char *)0);
1216 }
1217
1218 /** @brief Register a user
1219  * @param c Client
1220  * @param user Username
1221  * @param password Password
1222  * @param email Email address (UTF-8)
1223  * @param confirmp Where to store confirmation string
1224  * @return 0 on success, non-0 on error
1225  */
1226 int disorder_register(disorder_client *c, const char *user,
1227                       const char *password, const char *email,
1228                       char **confirmp) {
1229   return dequote(disorder_simple(c, confirmp, "register",
1230                                  user, password, email, (char *)0),
1231                  confirmp);
1232 }
1233
1234 /** @brief Confirm a user
1235  * @param c Client
1236  * @param confirm Confirmation string
1237  * @return 0 on success, non-0 on error
1238  */
1239 int disorder_confirm(disorder_client *c, const char *confirm) {
1240   char *u;
1241   int rc;
1242
1243   if(!(rc = dequote(disorder_simple(c, &u, "confirm", confirm, (char *)0),
1244                     &u)))
1245     c->user = u;
1246   return rc;
1247 }
1248
1249 /** @brief Make a cookie for this login
1250  * @param c Client
1251  * @param cookiep Where to store cookie string
1252  * @return 0 on success, non-0 on error
1253  */
1254 int disorder_make_cookie(disorder_client *c, char **cookiep) {
1255   return dequote(disorder_simple(c, cookiep, "make-cookie", (char *)0),
1256                  cookiep);
1257 }
1258
1259 /** @brief Revoke the cookie used by this session
1260  * @param c Client
1261  * @return 0 on success, non-0 on error
1262  */
1263 int disorder_revoke(disorder_client *c) {
1264   return disorder_simple(c, 0, "revoke", (char *)0);
1265 }
1266
1267 /** @brief Request a password reminder email
1268  * @param c Client
1269  * @param user Username
1270  * @return 0 on success, non-0 on error
1271  */
1272 int disorder_reminder(disorder_client *c, const char *user) {
1273   return disorder_simple(c, 0, "reminder", user, (char *)0);
1274 }
1275
1276 /** @brief List scheduled events
1277  * @param c Client
1278  * @param idsp Where to put list of event IDs
1279  * @param nidsp Where to put count of event IDs, or NULL
1280  * @return 0 on success, non-0 on error
1281  */
1282 int disorder_schedule_list(disorder_client *c, char ***idsp, int *nidsp) {
1283   return disorder_simple_list(c, idsp, nidsp, "schedule-list", (char *)0);
1284 }
1285
1286 /** @brief Delete a scheduled event
1287  * @param c Client
1288  * @param id Event ID to delete
1289  * @return 0 on success, non-0 on error
1290  */
1291 int disorder_schedule_del(disorder_client *c, const char *id) {
1292   return disorder_simple(c, 0, "schedule-del", id, (char *)0);
1293 }
1294
1295 /** @brief Get details of a scheduled event
1296  * @param c Client
1297  * @param id Event ID
1298  * @param actiondatap Where to put details
1299  * @return 0 on success, non-0 on error
1300  */
1301 int disorder_schedule_get(disorder_client *c, const char *id,
1302                           struct kvp **actiondatap) {
1303   char **lines, **bits;
1304   int rc, nbits;
1305
1306   *actiondatap = 0;
1307   if((rc = disorder_simple_list(c, &lines, NULL,
1308                                 "schedule-get", id, (char *)0)))
1309     return rc;
1310   while(*lines) {
1311     if(!(bits = split(*lines++, &nbits, SPLIT_QUOTES, 0, 0))) {
1312       error(0, "invalid schedule-get reply: cannot split line");
1313       return -1;
1314     }
1315     if(nbits != 2) {
1316       error(0, "invalid schedule-get reply: wrong number of fields");
1317       return -1;
1318     }
1319     kvp_set(actiondatap, bits[0], bits[1]);
1320   }
1321   return 0;
1322 }
1323
1324 /** @brief Add a scheduled event
1325  * @param c Client
1326  * @param when When to trigger the event
1327  * @param priority Event priority ("normal" or "junk")
1328  * @param action What action to perform
1329  * @param ... Action-specific arguments
1330  * @return 0 on success, non-0 on error
1331  *
1332  * For action @c "play" the next argument is the track.
1333  *
1334  * For action @c "set-global" next argument is the global preference name
1335  * and the final argument the value to set it to, or (char *)0 to unset it.
1336  */
1337 int disorder_schedule_add(disorder_client *c,
1338                           time_t when,
1339                           const char *priority,
1340                           const char *action,
1341                           ...) {
1342   va_list ap;
1343   char when_str[64];
1344   int rc;
1345
1346   snprintf(when_str, sizeof when_str, "%lld", (long long)when);
1347   va_start(ap, action);
1348   if(!strcmp(action, "play"))
1349     rc = disorder_simple(c, 0, "schedule-add", when_str, priority,
1350                          action, va_arg(ap, char *),
1351                          (char *)0);
1352   else if(!strcmp(action, "set-global")) {
1353     const char *key = va_arg(ap, char *);
1354     const char *value = va_arg(ap, char *);
1355     rc = disorder_simple(c, 0,"schedule-add",  when_str, priority,
1356                          action, key, value,
1357                          (char *)0);
1358   } else
1359     fatal(0, "unknown action '%s'", action);
1360   va_end(ap);
1361   return rc;
1362 }
1363
1364 /** @brief Delete a playlist
1365  * @param c Client
1366  * @param playlist Playlist to delete
1367  * @return 0 on success, non-0 on error
1368  */
1369 int disorder_playlist_delete(disorder_client *c,
1370                              const char *playlist) {
1371   return disorder_simple(c, 0, "playlist-delete", playlist, (char *)0);
1372 }
1373
1374 /** @brief Get the contents of a playlist
1375  * @param c Client
1376  * @param playlist Playlist to get
1377  * @param tracksp Where to put list of tracks
1378  * @param ntracksp Where to put count of tracks
1379  * @return 0 on success, non-0 on error
1380  */
1381 int disorder_playlist_get(disorder_client *c, const char *playlist,
1382                           char ***tracksp, int *ntracksp) {
1383   return disorder_simple_list(c, tracksp, ntracksp,
1384                               "playlist-get", playlist, (char *)0);
1385 }
1386
1387 /** @brief List all readable playlists
1388  * @param c Client
1389  * @param playlistsp Where to put list of playlists
1390  * @param nplaylistsp Where to put count of playlists
1391  * @return 0 on success, non-0 on error
1392  */
1393 int disorder_playlists(disorder_client *c,
1394                        char ***playlistsp, int *nplaylistsp) {
1395   return disorder_simple_list(c, playlistsp, nplaylistsp,
1396                               "playlists", (char *)0);
1397 }
1398
1399 /** @brief Get the sharing status of a playlist
1400  * @param c Client
1401  * @param playlist Playlist to inspect
1402  * @param sharep Where to put sharing status
1403  * @return 0 on success, non-0 on error
1404  *
1405  * Possible @p sharep values are @c public, @c private and @c shared.
1406  */
1407 int disorder_playlist_get_share(disorder_client *c, const char *playlist,
1408                                 char **sharep) {
1409   return disorder_simple(c, sharep,
1410                          "playlist-get-share", playlist, (char *)0);
1411 }
1412
1413 /** @brief Get the sharing status of a playlist
1414  * @param c Client
1415  * @param playlist Playlist to modify
1416  * @param share New sharing status
1417  * @return 0 on success, non-0 on error
1418  *
1419  * Possible @p share values are @c public, @c private and @c shared.
1420  */
1421 int disorder_playlist_set_share(disorder_client *c, const char *playlist,
1422                                 const char *share) {
1423   return disorder_simple(c, 0,
1424                          "playlist-set-share", playlist, share, (char *)0);
1425 }
1426
1427 /** @brief Lock a playlist for modifications
1428  * @param c Client
1429  * @param playlist Playlist to lock
1430  * @return 0 on success, non-0 on error
1431  */
1432 int disorder_playlist_lock(disorder_client *c, const char *playlist) {
1433   return disorder_simple(c, 0,
1434                          "playlist-lock", playlist, (char *)0);
1435 }
1436
1437 /** @brief Unlock the locked playlist
1438  * @param c Client
1439  * @return 0 on success, non-0 on error
1440  */
1441 int disorder_playlist_unlock(disorder_client *c) {
1442   return disorder_simple(c, 0,
1443                          "playlist-unlock", (char *)0);
1444 }
1445
1446 /** @brief Set the contents of a playlst
1447  * @param c Client
1448  * @param playlist Playlist to modify
1449  * @param tracks List of tracks
1450  * @param ntracks Length of @p tracks (or -1 to count up to the first NULL)
1451  * @return 0 on success, non-0 on error
1452  */
1453 int disorder_playlist_set(disorder_client *c,
1454                           const char *playlist,
1455                           char **tracks,
1456                           int ntracks) {
1457   return disorder_simple_body(c, 0, tracks, ntracks,
1458                               "playlist-set", playlist, (char *)0);
1459 }
1460
1461 /*
1462 Local Variables:
1463 c-basic-offset:2
1464 comment-column:40
1465 End:
1466 */