src/config.c

   1 #include "redis.h"
   2
   3 /*-----------------------------------------------------------------------------
   4  * Config file parsing
   5  *----------------------------------------------------------------------------*/
   6
   7 int yesnotoi(char *s) {
   8     if (!strcasecmp(s,"yes")) return 1;
   9     else if (!strcasecmp(s,"no")) return 0;
  10     else return -1;
  11 }
  12
  13 void appendServerSaveParams(time_t seconds, int changes) {
  14     server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1));
  15     server.saveparams[server.saveparamslen].seconds = seconds;
  16     server.saveparams[server.saveparamslen].changes = changes;
  17     server.saveparamslen++;
  18 }
  19
  20 void resetServerSaveParams() {
  21     zfree(server.saveparams);
  22     server.saveparams = NULL;
  23     server.saveparamslen = 0;
  24 }
  25
  26 /* I agree, this is a very rudimental way to load a configuration...
  27    will improve later if the config gets more complex */
  28 void loadServerConfig(char *filename) {
  29     FILE *fp;
  30     char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL;
  31     int linenum = 0;
  32     sds line = NULL;
  33
  34     if (filename[0] == '-' && filename[1] == '\0')
  35         fp = stdin;
  36     else {
  37         if ((fp = fopen(filename,"r")) == NULL) {
  38             redisLog(REDIS_WARNING, "Fatal error, can't open config file '%s'", filename);
  39             exit(1);
  40         }
  41     }
  42
  43     while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) {
  44         sds *argv;
  45         int argc, j;
  46
  47         linenum++;
  48         line = sdsnew(buf);
  49         line = sdstrim(line," \t\r\n");
  50
  51         /* Skip comments and blank lines*/
  52         if (line[0] == '#' || line[0] == '\0') {
  53             sdsfree(line);
  54             continue;
  55         }
  56
  57         /* Split into arguments */
  58         argv = sdssplitargs(line,&argc);
  59         sdstolower(argv[0]);
  60
  61         /* Execute config directives */
  62         if (!strcasecmp(argv[0],"timeout") && argc == 2) {
  63             server.maxidletime = atoi(argv[1]);
  64             if (server.maxidletime < 0) {
  65                 err = "Invalid timeout value"; goto loaderr;
  66             }
  67         } else if (!strcasecmp(argv[0],"port") && argc == 2) {
  68             server.port = atoi(argv[1]);
  69             if (server.port < 1 || server.port > 65535) {
  70                 err = "Invalid port"; goto loaderr;
  71             }
  72         } else if (!strcasecmp(argv[0],"bind") && argc == 2) {
  73             server.bindaddr = zstrdup(argv[1]);
  74         } else if (!strcasecmp(argv[0],"unixsocket") && argc == 2) {
  75             server.unixsocket = zstrdup(argv[1]);
  76         } else if (!strcasecmp(argv[0],"save") && argc == 3) {
  77             int seconds = atoi(argv[1]);
  78             int changes = atoi(argv[2]);
  79             if (seconds < 1 || changes < 0) {
  80                 err = "Invalid save parameters"; goto loaderr;
  81             }
  82             appendServerSaveParams(seconds,changes);
  83         } else if (!strcasecmp(argv[0],"dir") && argc == 2) {
  84             if (chdir(argv[1]) == -1) {
  85                 redisLog(REDIS_WARNING,"Can't chdir to '%s': %s",
  86                     argv[1], strerror(errno));
  87                 exit(1);
  88             }
  89         } else if (!strcasecmp(argv[0],"loglevel") && argc == 2) {
  90             if (!strcasecmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG;
  91             else if (!strcasecmp(argv[1],"verbose")) server.verbosity = REDIS_VERBOSE;
  92             else if (!strcasecmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE;
  93             else if (!strcasecmp(argv[1],"warning")) server.verbosity = REDIS_WARNING;
  94             else {
  95                 err = "Invalid log level. Must be one of debug, notice, warning";
  96                 goto loaderr;
  97             }
  98         } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
  99             FILE *logfp;
 100
 101             server.logfile = zstrdup(argv[1]);
 102             if (!strcasecmp(server.logfile,"stdout")) {
 103                 zfree(server.logfile);
 104                 server.logfile = NULL;
 105             }
 106             if (server.logfile) {
 107                 /* Test if we are able to open the file. The server will not
 108                  * be able to abort just for this problem later... */
 109                 logfp = fopen(server.logfile,"a");
 110                 if (logfp == NULL) {
 111                     err = sdscatprintf(sdsempty(),
 112                         "Can't open the log file: %s", strerror(errno));
 113                     goto loaderr;
 114                 }
 115                 fclose(logfp);
 116             }
 117         } else if (!strcasecmp(argv[0],"databases") && argc == 2) {
 118             server.dbnum = atoi(argv[1]);
 119             if (server.dbnum < 1) {
 120                 err = "Invalid number of databases"; goto loaderr;
 121             }
 122         } else if (!strcasecmp(argv[0],"include") && argc == 2) {
 123             loadServerConfig(argv[1]);
 124         } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
 125             server.maxclients = atoi(argv[1]);
 126         } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
 127             server.maxmemory = memtoll(argv[1],NULL);
 128         } else if (!strcasecmp(argv[0],"maxmemory-policy") && argc == 2) {
 129             if (!strcasecmp(argv[1],"volatile-lru")) {
 130                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
 131             } else if (!strcasecmp(argv[1],"volatile-random")) {
 132                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
 133             } else if (!strcasecmp(argv[1],"volatile-ttl")) {
 134                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
 135             } else if (!strcasecmp(argv[1],"allkeys-lru")) {
 136                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
 137             } else if (!strcasecmp(argv[1],"allkeys-random")) {
 138                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
 139             } else {
 140                 err = "Invalid maxmemory policy";
 141                 goto loaderr;
 142             }
 143         } else if (!strcasecmp(argv[0],"maxmemory-samples") && argc == 2) {
 144             server.maxmemory_samples = atoi(argv[1]);
 145             if (server.maxmemory_samples <= 0) {
 146                 err = "maxmemory-samples must be 1 or greater";
 147                 goto loaderr;
 148             }
 149         } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
 150             server.masterhost = sdsnew(argv[1]);
 151             server.masterport = atoi(argv[2]);
 152             server.replstate = REDIS_REPL_CONNECT;
 153         } else if (!strcasecmp(argv[0],"masterauth") && argc == 2) {
 154                 server.masterauth = zstrdup(argv[1]);
 155         } else if (!strcasecmp(argv[0],"slave-serve-stale-data") && argc == 2) {
 156             if ((server.repl_serve_stale_data = yesnotoi(argv[1])) == -1) {
 157                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 158             }
 159         } else if (!strcasecmp(argv[0],"glueoutputbuf") && argc == 2) {
 160             if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) {
 161                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 162             }
 163         } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
 164             if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
 165                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 166             }
 167         } else if (!strcasecmp(argv[0],"activerehashing") && argc == 2) {
 168             if ((server.activerehashing = yesnotoi(argv[1])) == -1) {
 169                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 170             }
 171         } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
 172             if ((server.daemonize = yesnotoi(argv[1])) == -1) {
 173                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 174             }
 175         } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) {
 176             if ((server.appendonly = yesnotoi(argv[1])) == -1) {
 177                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 178             }
 179         } else if (!strcasecmp(argv[0],"appendfilename") && argc == 2) {
 180             zfree(server.appendfilename);
 181             server.appendfilename = zstrdup(argv[1]);
 182         } else if (!strcasecmp(argv[0],"no-appendfsync-on-rewrite")
 183                    && argc == 2) {
 184             if ((server.no_appendfsync_on_rewrite= yesnotoi(argv[1])) == -1) {
 185                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 186             }
 187         } else if (!strcasecmp(argv[0],"appendfsync") && argc == 2) {
 188             if (!strcasecmp(argv[1],"no")) {
 189                 server.appendfsync = APPENDFSYNC_NO;
 190             } else if (!strcasecmp(argv[1],"always")) {
 191                 server.appendfsync = APPENDFSYNC_ALWAYS;
 192             } else if (!strcasecmp(argv[1],"everysec")) {
 193                 server.appendfsync = APPENDFSYNC_EVERYSEC;
 194             } else {
 195                 err = "argument must be 'no', 'always' or 'everysec'";
 196                 goto loaderr;
 197             }
 198         } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
 199             server.requirepass = zstrdup(argv[1]);
 200         } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
 201             zfree(server.pidfile);
 202             server.pidfile = zstrdup(argv[1]);
 203         } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
 204             zfree(server.dbfilename);
 205             server.dbfilename = zstrdup(argv[1]);
 206         } else if (!strcasecmp(argv[0],"vm-enabled") && argc == 2) {
 207             if ((server.vm_enabled = yesnotoi(argv[1])) == -1) {
 208                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 209             }
 210         } else if (!strcasecmp(argv[0],"vm-swap-file") && argc == 2) {
 211             zfree(server.vm_swap_file);
 212             server.vm_swap_file = zstrdup(argv[1]);
 213         } else if (!strcasecmp(argv[0],"vm-max-memory") && argc == 2) {
 214             server.vm_max_memory = memtoll(argv[1],NULL);
 215         } else if (!strcasecmp(argv[0],"vm-page-size") && argc == 2) {
 216             server.vm_page_size = memtoll(argv[1], NULL);
 217         } else if (!strcasecmp(argv[0],"vm-pages") && argc == 2) {
 218             server.vm_pages = memtoll(argv[1], NULL);
 219         } else if (!strcasecmp(argv[0],"vm-max-threads") && argc == 2) {
 220             server.vm_max_threads = strtoll(argv[1], NULL, 10);
 221         } else if (!strcasecmp(argv[0],"hash-max-zipmap-entries") && argc == 2) {
 222             server.hash_max_zipmap_entries = memtoll(argv[1], NULL);
 223         } else if (!strcasecmp(argv[0],"hash-max-zipmap-value") && argc == 2) {
 224             server.hash_max_zipmap_value = memtoll(argv[1], NULL);
 225         } else if (!strcasecmp(argv[0],"list-max-ziplist-entries") && argc == 2){
 226             server.list_max_ziplist_entries = memtoll(argv[1], NULL);
 227         } else if (!strcasecmp(argv[0],"list-max-ziplist-value") && argc == 2) {
 228             server.list_max_ziplist_value = memtoll(argv[1], NULL);
 229         } else if (!strcasecmp(argv[0],"set-max-intset-entries") && argc == 2) {
 230             server.set_max_intset_entries = memtoll(argv[1], NULL);
 231         } else if (!strcasecmp(argv[0],"rename-command") && argc == 3) {
 232             struct redisCommand *cmd = lookupCommand(argv[1]);
 233             int retval;
 234
 235             if (!cmd) {
 236                 err = "No such command in rename-command";
 237                 goto loaderr;
 238             }
 239
 240             /* If the target command name is the emtpy string we just
 241              * remove it from the command table. */
 242             retval = dictDelete(server.commands, argv[1]);
 243             redisAssert(retval == DICT_OK);
 244
 245             /* Otherwise we re-add the command under a different name. */
 246             if (sdslen(argv[2]) != 0) {
 247                 sds copy = sdsdup(argv[2]);
 248
 249                 retval = dictAdd(server.commands, copy, cmd);
 250                 if (retval != DICT_OK) {
 251                     sdsfree(copy);
 252                     err = "Target command name already exists"; goto loaderr;
 253                 }
 254             }
 255         } else {
 256             err = "Bad directive or wrong number of arguments"; goto loaderr;
 257         }
 258         for (j = 0; j < argc; j++)
 259             sdsfree(argv[j]);
 260         zfree(argv);
 261         sdsfree(line);
 262     }
 263     if (fp != stdin) fclose(fp);
 264     return;
 265
 266 loaderr:
 267     fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
 268     fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
 269     fprintf(stderr, ">>> '%s'\n", line);
 270     fprintf(stderr, "%s\n", err);
 271     exit(1);
 272 }
 273
 274 /*-----------------------------------------------------------------------------
 275  * CONFIG command for remote configuration
 276  *----------------------------------------------------------------------------*/
 277
 278 void configSetCommand(redisClient *c) {
 279     robj *o;
 280     long long ll;
 281     redisAssert(c->argv[2]->encoding == REDIS_ENCODING_RAW);
 282     redisAssert(c->argv[3]->encoding == REDIS_ENCODING_RAW);
 283     o = c->argv[3];
 284
 285     if (!strcasecmp(c->argv[2]->ptr,"dbfilename")) {
 286         zfree(server.dbfilename);
 287         server.dbfilename = zstrdup(o->ptr);
 288     } else if (!strcasecmp(c->argv[2]->ptr,"requirepass")) {
 289         zfree(server.requirepass);
 290         server.requirepass = zstrdup(o->ptr);
 291     } else if (!strcasecmp(c->argv[2]->ptr,"masterauth")) {
 292         zfree(server.masterauth);
 293         server.masterauth = zstrdup(o->ptr);
 294     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory")) {
 295         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 296             ll < 0) goto badfmt;
 297         server.maxmemory = ll;
 298         if (server.maxmemory) freeMemoryIfNeeded();
 299     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-policy")) {
 300         if (!strcasecmp(o->ptr,"volatile-lru")) {
 301             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
 302         } else if (!strcasecmp(o->ptr,"volatile-random")) {
 303             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
 304         } else if (!strcasecmp(o->ptr,"volatile-ttl")) {
 305             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
 306         } else if (!strcasecmp(o->ptr,"allkeys-lru")) {
 307             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
 308         } else if (!strcasecmp(o->ptr,"allkeys-random")) {
 309             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
 310         } else {
 311             goto badfmt;
 312         }
 313     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-samples")) {
 314         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 315             ll <= 0) goto badfmt;
 316         server.maxmemory_samples = ll;
 317     } else if (!strcasecmp(c->argv[2]->ptr,"timeout")) {
 318         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 319             ll < 0 || ll > LONG_MAX) goto badfmt;
 320         server.maxidletime = ll;
 321     } else if (!strcasecmp(c->argv[2]->ptr,"appendfsync")) {
 322         if (!strcasecmp(o->ptr,"no")) {
 323             server.appendfsync = APPENDFSYNC_NO;
 324         } else if (!strcasecmp(o->ptr,"everysec")) {
 325             server.appendfsync = APPENDFSYNC_EVERYSEC;
 326         } else if (!strcasecmp(o->ptr,"always")) {
 327             server.appendfsync = APPENDFSYNC_ALWAYS;
 328         } else {
 329             goto badfmt;
 330         }
 331     } else if (!strcasecmp(c->argv[2]->ptr,"no-appendfsync-on-rewrite")) {
 332         int yn = yesnotoi(o->ptr);
 333
 334         if (yn == -1) goto badfmt;
 335         server.no_appendfsync_on_rewrite = yn;
 336     } else if (!strcasecmp(c->argv[2]->ptr,"appendonly")) {
 337         int old = server.appendonly;
 338         int new = yesnotoi(o->ptr);
 339
 340         if (new == -1) goto badfmt;
 341         if (old != new) {
 342             if (new == 0) {
 343                 stopAppendOnly();
 344             } else {
 345                 if (startAppendOnly() == REDIS_ERR) {
 346                     addReplyError(c,
 347                         "Unable to turn on AOF. Check server logs.");
 348                     return;
 349                 }
 350             }
 351         }
 352     } else if (!strcasecmp(c->argv[2]->ptr,"save")) {
 353         int vlen, j;
 354         sds *v = sdssplitlen(o->ptr,sdslen(o->ptr)," ",1,&vlen);
 355
 356         /* Perform sanity check before setting the new config:
 357          * - Even number of args
 358          * - Seconds >= 1, changes >= 0 */
 359         if (vlen & 1) {
 360             sdsfreesplitres(v,vlen);
 361             goto badfmt;
 362         }
 363         for (j = 0; j < vlen; j++) {
 364             char *eptr;
 365             long val;
 366
 367             val = strtoll(v[j], &eptr, 10);
 368             if (eptr[0] != '\0' ||
 369                 ((j & 1) == 0 && val < 1) ||
 370                 ((j & 1) == 1 && val < 0)) {
 371                 sdsfreesplitres(v,vlen);
 372                 goto badfmt;
 373             }
 374         }
 375         /* Finally set the new config */
 376         resetServerSaveParams();
 377         for (j = 0; j < vlen; j += 2) {
 378             time_t seconds;
 379             int changes;
 380
 381             seconds = strtoll(v[j],NULL,10);
 382             changes = strtoll(v[j+1],NULL,10);
 383             appendServerSaveParams(seconds, changes);
 384         }
 385         sdsfreesplitres(v,vlen);
 386     } else if (!strcasecmp(c->argv[2]->ptr,"slave-serve-stale-data")) {
 387         int yn = yesnotoi(o->ptr);
 388
 389         if (yn == -1) goto badfmt;
 390         server.repl_serve_stale_data = yn;
 391     } else {
 392         addReplyErrorFormat(c,"Unsupported CONFIG parameter: %s",
 393             (char*)c->argv[2]->ptr);
 394         return;
 395     }
 396     addReply(c,shared.ok);
 397     return;
 398
 399 badfmt: /* Bad format errors */
 400     addReplyErrorFormat(c,"Invalid argument '%s' for CONFIG SET '%s'",
 401             (char*)o->ptr,
 402             (char*)c->argv[2]->ptr);
 403 }
 404
 405 void configGetCommand(redisClient *c) {
 406     robj *o = c->argv[2];
 407     void *replylen = addDeferredMultiBulkLength(c);
 408     char *pattern = o->ptr;
 409     char buf[128];
 410     int matches = 0;
 411     redisAssert(o->encoding == REDIS_ENCODING_RAW);
 412
 413     if (stringmatch(pattern,"dbfilename",0)) {
 414         addReplyBulkCString(c,"dbfilename");
 415         addReplyBulkCString(c,server.dbfilename);
 416         matches++;
 417     }
 418     if (stringmatch(pattern,"requirepass",0)) {
 419         addReplyBulkCString(c,"requirepass");
 420         addReplyBulkCString(c,server.requirepass);
 421         matches++;
 422     }
 423     if (stringmatch(pattern,"masterauth",0)) {
 424         addReplyBulkCString(c,"masterauth");
 425         addReplyBulkCString(c,server.masterauth);
 426         matches++;
 427     }
 428     if (stringmatch(pattern,"maxmemory",0)) {
 429         ll2string(buf,sizeof(buf),server.maxmemory);
 430         addReplyBulkCString(c,"maxmemory");
 431         addReplyBulkCString(c,buf);
 432         matches++;
 433     }
 434     if (stringmatch(pattern,"maxmemory-policy",0)) {
 435         char *s;
 436
 437         switch(server.maxmemory_policy) {
 438         case REDIS_MAXMEMORY_VOLATILE_LRU: s = "volatile-lru"; break;
 439         case REDIS_MAXMEMORY_VOLATILE_TTL: s = "volatile-ttl"; break;
 440         case REDIS_MAXMEMORY_VOLATILE_RANDOM: s = "volatile-random"; break;
 441         case REDIS_MAXMEMORY_ALLKEYS_LRU: s = "allkeys-lru"; break;
 442         case REDIS_MAXMEMORY_ALLKEYS_RANDOM: s = "allkeys-random"; break;
 443         default: s = "unknown"; break; /* too harmless to panic */
 444         }
 445         addReplyBulkCString(c,"maxmemory-policy");
 446         addReplyBulkCString(c,s);
 447         matches++;
 448     }
 449     if (stringmatch(pattern,"maxmemory-samples",0)) {
 450         ll2string(buf,sizeof(buf),server.maxmemory_samples);
 451         addReplyBulkCString(c,"maxmemory-samples");
 452         addReplyBulkCString(c,buf);
 453         matches++;
 454     }
 455     if (stringmatch(pattern,"timeout",0)) {
 456         ll2string(buf,sizeof(buf),server.maxidletime);
 457         addReplyBulkCString(c,"timeout");
 458         addReplyBulkCString(c,buf);
 459         matches++;
 460     }
 461     if (stringmatch(pattern,"appendonly",0)) {
 462         addReplyBulkCString(c,"appendonly");
 463         addReplyBulkCString(c,server.appendonly ? "yes" : "no");
 464         matches++;
 465     }
 466     if (stringmatch(pattern,"no-appendfsync-on-rewrite",0)) {
 467         addReplyBulkCString(c,"no-appendfsync-on-rewrite");
 468         addReplyBulkCString(c,server.no_appendfsync_on_rewrite ? "yes" : "no");
 469         matches++;
 470     }
 471     if (stringmatch(pattern,"appendfsync",0)) {
 472         char *policy;
 473
 474         switch(server.appendfsync) {
 475         case APPENDFSYNC_NO: policy = "no"; break;
 476         case APPENDFSYNC_EVERYSEC: policy = "everysec"; break;
 477         case APPENDFSYNC_ALWAYS: policy = "always"; break;
 478         default: policy = "unknown"; break; /* too harmless to panic */
 479         }
 480         addReplyBulkCString(c,"appendfsync");
 481         addReplyBulkCString(c,policy);
 482         matches++;
 483     }
 484     if (stringmatch(pattern,"save",0)) {
 485         sds buf = sdsempty();
 486         int j;
 487
 488         for (j = 0; j < server.saveparamslen; j++) {
 489             buf = sdscatprintf(buf,"%ld %d",
 490                     server.saveparams[j].seconds,
 491                     server.saveparams[j].changes);
 492             if (j != server.saveparamslen-1)
 493                 buf = sdscatlen(buf," ",1);
 494         }
 495         addReplyBulkCString(c,"save");
 496         addReplyBulkCString(c,buf);
 497         sdsfree(buf);
 498         matches++;
 499     }
 500     if (stringmatch(pattern,"slave-serve-stale-data",0)) {
 501         addReplyBulkCString(c,"slave-serve-stale-data");
 502         addReplyBulkCString(c,server.repl_serve_stale_data ? "yes" : "no");
 503         matches++;
 504     }
 505     setDeferredMultiBulkLength(c,replylen,matches*2);
 506 }
 507
 508 void configCommand(redisClient *c) {
 509     if (!strcasecmp(c->argv[1]->ptr,"set")) {
 510         if (c->argc != 4) goto badarity;
 511         configSetCommand(c);
 512     } else if (!strcasecmp(c->argv[1]->ptr,"get")) {
 513         if (c->argc != 3) goto badarity;
 514         configGetCommand(c);
 515     } else if (!strcasecmp(c->argv[1]->ptr,"resetstat")) {
 516         if (c->argc != 2) goto badarity;
 517         server.stat_keyspace_hits = 0;
 518         server.stat_keyspace_misses = 0;
 519         server.stat_numcommands = 0;
 520         server.stat_numconnections = 0;
 521         server.stat_expiredkeys = 0;
 522         addReply(c,shared.ok);
 523     } else {
 524         addReplyError(c,
 525             "CONFIG subcommand must be one of GET, SET, RESETSTAT");
 526     }
 527     return;
 528
 529 badarity:
 530     addReplyErrorFormat(c,"Wrong number of arguments for CONFIG %s",
 531         (char*) c->argv[1]->ptr);
 532 }