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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004-2010 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 Marker for a command body */
 155 static const char disorder_body[1];
 156
 157 /** @brief Marker for a list of args */
 158 static const char disorder_list[1];
 159
 160 /** @brief Issue a command and parse a simple response
 161  * @param c Client
 162  * @param rp Where to store result, or NULL
 163  * @param cmd Command
 164  * @param ap Arguments (UTF-8), terminated by (char *)0
 165  * @return 0 on success, non-0 on error
 166  *
 167  * 5xx responses count as errors.
 168  *
 169  * @p rp will NOT be filled in for xx9 responses (where it is just
 170  * commentary for a command where it would normally be meaningful).
 171  *
 172  * NB that the response will NOT be converted to the local encoding
 173  * nor will quotes be stripped.  See dequote().
 174  *
 175  * Put @ref disorder_body in the argument list followed by a char **
 176  * and int giving the body to follow the command.  If the int is @c -1
 177  * then the list is assumed to be NULL-terminated.  This may be used
 178  * only once.
 179  *
 180  * Put @ref disorder_list in the argument list followed by a char **
 181  * and int giving a list of arguments to include.  If the int is @c -1
 182  * then the list is assumed to be NULL-terminated.  This may be used
 183  * any number of times.
 184  *
 185  * Usually you would call this via one of the following interfaces:
 186  * - disorder_simple()
 187  */
 188 static int disorder_simple_v(disorder_client *c,
 189                              char **rp,
 190                              const char *cmd,
 191                              va_list ap) {
 192   const char *arg;
 193   struct dynstr d;
 194   char **body = NULL;
 195   int nbody = 0;
 196   int has_body = 0;
 197
 198   if(!c->fpout) {
 199     c->last = "not connected";
 200     disorder_error(0, "not connected to server");
 201     return -1;
 202   }
 203   if(cmd) {
 204     dynstr_init(&d);
 205     dynstr_append_string(&d, cmd);
 206     while((arg = va_arg(ap, const char *))) {
 207       if(arg == disorder_body) {
 208         body = va_arg(ap, char **);
 209         nbody = va_arg(ap, int);
 210         has_body = 1;
 211       } else if(arg == disorder_list) {
 212         char **list = va_arg(ap, char **);
 213         int nlist = va_arg(ap, int);
 214         if(nlist < 0) {
 215           for(nlist = 0; list[nlist]; ++nlist)
 216             ;
 217         }
 218         for(int n = 0; n < nlist; ++n) {
 219           dynstr_append(&d, ' ');
 220           dynstr_append_string(&d, quoteutf8(arg));
 221         }
 222       } else {
 223         dynstr_append(&d, ' ');
 224         dynstr_append_string(&d, quoteutf8(arg));
 225       }
 226     }
 227     dynstr_append(&d, '\n');
 228     dynstr_terminate(&d);
 229     D(("command: %s", d.vec));
 230     if(fputs(d.vec, c->fpout) < 0)
 231       goto write_error;
 232     xfree(d.vec);
 233     if(has_body) {
 234       if(nbody < 0)
 235         for(nbody = 0; body[nbody]; ++nbody)
 236           ;
 237       for(int n = 0; n < nbody; ++n) {
 238         if(body[n][0] == '.')
 239           if(fputc('.', c->fpout) < 0)
 240             goto write_error;
 241         if(fputs(body[n], c->fpout) < 0)
 242           goto write_error;
 243         if(fputc('\n', c->fpout) < 0)
 244           goto write_error;
 245       }
 246       if(fputs(".\n", c->fpout) < 0)
 247         goto write_error;
 248     }
 249     if(fflush(c->fpout))
 250       goto write_error;
 251   }
 252   return check_response(c, rp);
 253 write_error:
 254   byte_xasprintf((char **)&c->last, "write error: %s", strerror(errno));
 255   disorder_error(errno, "error writing to %s", c->ident);
 256   return -1;
 257 }
 258
 259 /** @brief Issue a command and parse a simple response
 260  * @param c Client
 261  * @param rp Where to store result, or NULL (UTF-8)
 262  * @param cmd Command
 263  * @return 0 on success, non-0 on error
 264  *
 265  * The remaining arguments are command arguments, terminated by (char
 266  * *)0.  They should be in UTF-8.
 267  *
 268  * 5xx responses count as errors.
 269  *
 270  * @p rp will NOT be filled in for xx9 responses (where it is just
 271  * commentary for a command where it would normally be meaningful).
 272  *
 273  * NB that the response will NOT be converted to the local encoding
 274  * nor will quotes be stripped.  See dequote().
 275  */
 276 static int disorder_simple(disorder_client *c,
 277                            char **rp,
 278                            const char *cmd, ...) {
 279   va_list ap;
 280   int ret;
 281
 282   va_start(ap, cmd);
 283   ret = disorder_simple_v(c, rp, cmd, ap);
 284   va_end(ap);
 285   return ret;
 286 }
 287
 288 /** @brief Dequote a result string
 289  * @param rc 0 on success, non-0 on error
 290  * @param rp Where result string is stored (UTF-8)
 291  * @return @p rc
 292  *
 293  * This is used as a wrapper around disorder_simple() to dequote
 294  * results in place.
 295  */
 296 static int dequote(int rc, char **rp) {
 297   char **rr;
 298
 299   if(!rc) {
 300     if((rr = split(*rp, 0, SPLIT_QUOTES, 0, 0)) && *rr) {
 301       xfree(*rp);
 302       *rp = *rr;
 303       xfree(rr);
 304       return 0;
 305     }
 306     disorder_error(0, "invalid reply: %s", *rp);
 307   }
 308   return rc;
 309 }
 310
 311 /** @brief Generic connection routine
 312  * @param conf Configuration to follow
 313  * @param c Client
 314  * @param username Username to log in with or NULL
 315  * @param password Password to log in with or NULL
 316  * @param cookie Cookie to log in with or NULL
 317  * @return 0 on success, non-0 on error
 318  *
 319  * @p cookie is tried first if not NULL.  If it is NULL then @p
 320  * username must not be.  If @p username is not NULL then nor may @p
 321  * password be.
 322  */
 323 int disorder_connect_generic(struct config *conf,
 324                              disorder_client *c,
 325                              const char *username,
 326                              const char *password,
 327                              const char *cookie) {
 328   int fd = -1, fd2 = -1, nrvec = 0, rc;
 329   unsigned char *nonce = NULL;
 330   size_t nl;
 331   char *res = NULL;
 332   char *r = NULL, **rvec = NULL;
 333   const char *protocol, *algorithm, *challenge;
 334   struct sockaddr *sa = NULL;
 335   socklen_t salen;
 336
 337   if((salen = find_server(conf, &sa, &c->ident)) == (socklen_t)-1)
 338     return -1;
 339   c->fpin = c->fpout = 0;
 340   if((fd = socket(sa->sa_family, SOCK_STREAM, 0)) < 0) {
 341     byte_xasprintf((char **)&c->last, "socket: %s", strerror(errno));
 342     disorder_error(errno, "error calling socket");
 343     return -1;
 344   }
 345   if(connect(fd, sa, salen) < 0) {
 346     byte_xasprintf((char **)&c->last, "connect: %s", strerror(errno));
 347     disorder_error(errno, "error calling connect");
 348     goto error;
 349   }
 350   if((fd2 = dup(fd)) < 0) {
 351     byte_xasprintf((char **)&c->last, "dup: %s", strerror(errno));
 352     disorder_error(errno, "error calling dup");
 353     goto error;
 354   }
 355   if(!(c->fpin = fdopen(fd, "rb"))) {
 356     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 357     disorder_error(errno, "error calling fdopen");
 358     goto error;
 359   }
 360   fd = -1;
 361   if(!(c->fpout = fdopen(fd2, "wb"))) {
 362     byte_xasprintf((char **)&c->last, "fdopen: %s", strerror(errno));
 363     disorder_error(errno, "error calling fdopen");
 364     goto error;
 365   }
 366   fd2 = -1;
 367   if((rc = disorder_simple(c, &r, 0, (const char *)0)))
 368     goto error_rc;
 369   if(!(rvec = split(r, &nrvec, SPLIT_QUOTES, 0, 0)))
 370     goto error;
 371   if(nrvec != 3) {
 372     c->last = "cannot parse server greeting";
 373     disorder_error(0, "cannot parse server greeting %s", r);
 374     goto error;
 375   }
 376   protocol = rvec[0];
 377   if(strcmp(protocol, "2")) {
 378     c->last = "unknown protocol version";
 379     disorder_error(0, "unknown protocol version: %s", protocol);
 380     goto error;
 381   }
 382   algorithm = rvec[1];
 383   challenge = rvec[2];
 384   if(!(nonce = unhex(challenge, &nl)))
 385     goto error;
 386   if(cookie) {
 387     if(!dequote(disorder_simple(c, &c->user, "cookie", cookie, (char *)0),
 388                 &c->user))
 389       return 0;                         /* success */
 390     if(!username) {
 391       c->last = "cookie failed and no username";
 392       disorder_error(0, "cookie did not work and no username available");
 393       goto error;
 394     }
 395   }
 396   if(!(res = authhash(nonce, nl, password, algorithm))) {
 397     c->last = "error computing authorization hash";
 398     goto error;
 399   }
 400   if((rc = disorder_simple(c, 0, "user", username, res, (char *)0)))
 401     goto error_rc;
 402   c->user = xstrdup(username);
 403   xfree(res);
 404   free_strings(nrvec, rvec);
 405   xfree(nonce);
 406   xfree(sa);
 407   xfree(r);
 408   return 0;
 409 error:
 410   rc = -1;
 411 error_rc:
 412   if(c->fpin) {
 413     fclose(c->fpin);
 414     c->fpin = 0;
 415   }
 416   if(c->fpout) {
 417     fclose(c->fpout);
 418     c->fpout = 0;
 419   }
 420   if(fd2 != -1) close(fd2);
 421   if(fd != -1) close(fd);
 422   return rc;
 423 }
 424
 425 /** @brief Connect a client with a specified username and password
 426  * @param c Client
 427  * @param username Username to log in with
 428  * @param password Password to log in with
 429  * @return 0 on success, non-0 on error
 430  */
 431 int disorder_connect_user(disorder_client *c,
 432                           const char *username,
 433                           const char *password) {
 434   return disorder_connect_generic(config,
 435                                   c,
 436                                   username,
 437                                   password,
 438                                   0);
 439 }
 440
 441 /** @brief Connect a client
 442  * @param c Client
 443  * @return 0 on success, non-0 on error
 444  *
 445  * The connection will use the username and password found in @ref
 446  * config, or directly from the database if no password is found and
 447  * the database is readable (usually only for root).
 448  */
 449 int disorder_connect(disorder_client *c) {
 450   const char *username, *password;
 451
 452   if(!(username = config->username)) {
 453     c->last = "no username";
 454     disorder_error(0, "no username configured");
 455     return -1;
 456   }
 457   password = config->password;
 458   /* Maybe we can read the database */
 459   if(!password && trackdb_readable()) {
 460     trackdb_init(TRACKDB_NO_RECOVER|TRACKDB_NO_UPGRADE);
 461     trackdb_open(TRACKDB_READ_ONLY);
 462     password = trackdb_get_password(username);
 463     trackdb_close();
 464   }
 465   if(!password) {
 466     /* Oh well */
 467     c->last = "no password";
 468     disorder_error(0, "no password configured for user '%s'", username);
 469     return -1;
 470   }
 471   return disorder_connect_generic(config,
 472                                   c,
 473                                   username,
 474                                   password,
 475                                   0);
 476 }
 477
 478 /** @brief Connect a client
 479  * @param c Client
 480  * @param cookie Cookie to log in with, or NULL
 481  * @return 0 on success, non-0 on error
 482  *
 483  * If @p cookie is NULL or does not work then we attempt to log in as
 484  * guest instead (so when the cookie expires only an extra round trip
 485  * is needed rathre than a complete new login).
 486  */
 487 int disorder_connect_cookie(disorder_client *c,
 488                             const char *cookie) {
 489   return disorder_connect_generic(config,
 490                                   c,
 491                                   "guest",
 492                                   "",
 493                                   cookie);
 494 }
 495
 496 /** @brief Close a client
 497  * @param c Client
 498  * @return 0 on succcess, non-0 on errior
 499  *
 500  * The client is still closed even on error.  It might well be
 501  * appropriate to ignore the return value.
 502  */
 503 int disorder_close(disorder_client *c) {
 504   int ret = 0;
 505
 506   if(c->fpin) {
 507     if(fclose(c->fpin) < 0) {
 508       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 509       disorder_error(errno, "error calling fclose");
 510       ret = -1;
 511     }
 512     c->fpin = 0;
 513   }
 514   if(c->fpout) {
 515     if(fclose(c->fpout) < 0) {
 516       byte_xasprintf((char **)&c->last, "fclose: %s", strerror(errno));
 517       disorder_error(errno, "error calling fclose");
 518       ret = -1;
 519     }
 520     c->fpout = 0;
 521   }
 522   xfree(c->ident);
 523   c->ident = 0;
 524   xfree(c->user);
 525   c->user = 0;
 526   return ret;
 527 }
 528
 529 static void client_error(const char *msg,
 530                          void attribute((unused)) *u) {
 531   disorder_error(0, "error parsing reply: %s", msg);
 532 }
 533
 534 /** @brief Get a single queue entry
 535  * @param c Client
 536  * @param cmd Command
 537  * @param qp Where to store track information
 538  * @return 0 on success, non-0 on error
 539  */
 540 static int onequeue(disorder_client *c, const char *cmd,
 541                     struct queue_entry **qp) {
 542   char *r;
 543   struct queue_entry *q;
 544   int rc;
 545
 546   if((rc = disorder_simple(c, &r, cmd, (char *)0)))
 547     return rc;
 548   if(r) {
 549     q = xmalloc(sizeof *q);
 550     if(queue_unmarshall(q, r, client_error, 0))
 551       return -1;
 552     *qp = q;
 553   } else
 554     *qp = 0;
 555   return 0;
 556 }
 557
 558 /** @brief Fetch the queue, recent list, etc */
 559 static int readqueue(disorder_client *c,
 560                      struct queue_entry **qp) {
 561   struct queue_entry *qh, **qt = &qh, *q;
 562   char *l;
 563
 564   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 565     if(!strcmp(l, ".")) {
 566       *qt = 0;
 567       *qp = qh;
 568       xfree(l);
 569       return 0;
 570     }
 571     q = xmalloc(sizeof *q);
 572     if(!queue_unmarshall(q, l, client_error, 0)) {
 573       *qt = q;
 574       qt = &q->next;
 575     }
 576     xfree(l);
 577   }
 578   if(ferror(c->fpin)) {
 579     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 580     disorder_error(errno, "error reading %s", c->ident);
 581   } else {
 582     c->last = "input error: unexpected EOF";
 583     disorder_error(0, "error reading %s: unexpected EOF", c->ident);
 584   }
 585   return -1;
 586 }
 587
 588 /** @brief Read a dot-stuffed list
 589  * @param c Client
 590  * @param vecp Where to store list (UTF-8)
 591  * @param nvecp Where to store number of items, or NULL
 592  * @return 0 on success, non-0 on error
 593  *
 594  * The list will have a final NULL not counted in @p nvecp.
 595  */
 596 static int readlist(disorder_client *c, char ***vecp, int *nvecp) {
 597   char *l;
 598   struct vector v;
 599
 600   vector_init(&v);
 601   while(inputline(c->ident, c->fpin, &l, '\n') >= 0) {
 602     if(!strcmp(l, ".")) {
 603       vector_terminate(&v);
 604       if(nvecp)
 605         *nvecp = v.nvec;
 606       *vecp = v.vec;
 607       xfree(l);
 608       return 0;
 609     }
 610     vector_append(&v, xstrdup(l + (*l == '.')));
 611     xfree(l);
 612   }
 613   if(ferror(c->fpin)) {
 614     byte_xasprintf((char **)&c->last, "input error: %s", strerror(errno));
 615     disorder_error(errno, "error reading %s", c->ident);
 616   } else {
 617     c->last = "input error: unexpxected EOF";
 618     disorder_error(0, "error reading %s: unexpected EOF", c->ident);
 619   }
 620   return -1;
 621 }
 622
 623 /** @brief Return the user we logged in with
 624  * @param c Client
 625  * @return User name (owned by @p c, don't modify)
 626  */
 627 char *disorder_user(disorder_client *c) {
 628   return c->user;
 629 }
 630
 631 static void pairlist_error_handler(const char *msg,
 632                                void attribute((unused)) *u) {
 633   disorder_error(0, "error handling key-value pair reply: %s", msg);
 634 }
 635
 636 /** @brief Get a list of key-value pairs
 637  * @param c Client
 638  * @param kp Where to store linked list of preferences
 639  * @param cmd Command
 640  * @param ... Arguments
 641  * @return 0 on success, non-0 on error
 642  */
 643 static int pairlist(disorder_client *c, struct kvp **kp, const char *cmd, ...) {
 644   char **vec, **pvec;
 645   int nvec, npvec, n, rc;
 646   struct kvp *k;
 647   va_list ap;
 648
 649   va_start(ap, cmd);
 650   rc = disorder_simple_v(c, 0, cmd, ap);
 651   va_end(ap);
 652   if(rc)
 653     return rc;
 654   if((rc = readlist(c, &vec, &nvec)))
 655      return rc;
 656   for(n = 0; n < nvec; ++n) {
 657     if(!(pvec = split(vec[n], &npvec, SPLIT_QUOTES, pairlist_error_handler, 0)))
 658       return -1;
 659     if(npvec != 2) {
 660       pairlist_error_handler("malformed response", 0);
 661       return -1;
 662     }
 663     *kp = k = xmalloc(sizeof *k);
 664     k->name = pvec[0];
 665     k->value = pvec[1];
 666     kp = &k->next;
 667     xfree(pvec);
 668   }
 669   free_strings(nvec, vec);
 670   *kp = 0;
 671   return 0;
 672 }
 673
 674 /** @brief Parse a boolean response
 675  * @param cmd Command for use in error messsage
 676  * @param value Result from server
 677  * @param flagp Where to store result
 678  * @return 0 on success, non-0 on error
 679  */
 680 static int boolean(const char *cmd, const char *value,
 681                    int *flagp) {
 682   if(!strcmp(value, "yes")) *flagp = 1;
 683   else if(!strcmp(value, "no")) *flagp = 0;
 684   else {
 685     disorder_error(0, "malformed response to '%s'", cmd);
 686     return -1;
 687   }
 688   return 0;
 689 }
 690
 691 /** @brief Log to a sink
 692  * @param c Client
 693  * @param s Sink to write log lines to
 694  * @return 0 on success, non-0 on error
 695  */
 696 int disorder_log(disorder_client *c, struct sink *s) {
 697   char *l;
 698   int rc;
 699
 700   if((rc = disorder_simple(c, 0, "log", (char *)0)))
 701     return rc;
 702   while(inputline(c->ident, c->fpin, &l, '\n') >= 0 && strcmp(l, "."))
 703     if(sink_printf(s, "%s\n", l) < 0) return -1;
 704   if(ferror(c->fpin) || feof(c->fpin)) {
 705     byte_xasprintf((char **)&c->last, "input error: %s",
 706                    ferror(c->fpin) ? strerror(errno) : "unexpxected EOF");
 707     return -1;
 708   }
 709   return 0;
 710 }
 711
 712 /** @brief Add a scheduled event
 713  * @param c Client
 714  * @param when When to trigger the event
 715  * @param priority Event priority ("normal" or "junk")
 716  * @param action What action to perform
 717  * @param ... Action-specific arguments
 718  * @return 0 on success, non-0 on error
 719  *
 720  * For action @c "play" the next argument is the track.
 721  *
 722  * For action @c "set-global" next argument is the global preference name
 723  * and the final argument the value to set it to, or (char *)0 to unset it.
 724  */
 725 int disorder_schedule_add(disorder_client *c,
 726                           time_t when,
 727                           const char *priority,
 728                           const char *action,
 729                           ...) {
 730   va_list ap;
 731   char when_str[64];
 732   int rc;
 733
 734   snprintf(when_str, sizeof when_str, "%lld", (long long)when);
 735   va_start(ap, action);
 736   if(!strcmp(action, "play"))
 737     rc = disorder_simple(c, 0, "schedule-add", when_str, priority,
 738                          action, va_arg(ap, char *),
 739                          (char *)0);
 740   else if(!strcmp(action, "set-global")) {
 741     const char *key = va_arg(ap, char *);
 742     const char *value = va_arg(ap, char *);
 743     rc = disorder_simple(c, 0,"schedule-add",  when_str, priority,
 744                          action, key, value,
 745                          (char *)0);
 746   } else
 747     disorder_fatal(0, "unknown action '%s'", action);
 748   va_end(ap);
 749   return rc;
 750 }
 751
 752 #include "client-stubs.c"
 753
 754 /*
 755 Local Variables:
 756 c-basic-offset:2
 757 comment-column:40
 758 End:
 759 */