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 if (!strcasecmp(argv[1],"noeviction")) {
 140                 server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
 141             } else {
 142                 err = "Invalid maxmemory policy";
 143                 goto loaderr;
 144             }
 145         } else if (!strcasecmp(argv[0],"maxmemory-samples") && argc == 2) {
 146             server.maxmemory_samples = atoi(argv[1]);
 147             if (server.maxmemory_samples <= 0) {
 148                 err = "maxmemory-samples must be 1 or greater";
 149                 goto loaderr;
 150             }
 151         } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
 152             server.masterhost = sdsnew(argv[1]);
 153             server.masterport = atoi(argv[2]);
 154             server.replstate = REDIS_REPL_CONNECT;
 155         } else if (!strcasecmp(argv[0],"masterauth") && argc == 2) {
 156                 server.masterauth = zstrdup(argv[1]);
 157         } else if (!strcasecmp(argv[0],"slave-serve-stale-data") && argc == 2) {
 158             if ((server.repl_serve_stale_data = yesnotoi(argv[1])) == -1) {
 159                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 160             }
 161         } else if (!strcasecmp(argv[0],"glueoutputbuf") && argc == 2) {
 162             if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) {
 163                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 164             }
 165         } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
 166             if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
 167                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 168             }
 169         } else if (!strcasecmp(argv[0],"activerehashing") && argc == 2) {
 170             if ((server.activerehashing = yesnotoi(argv[1])) == -1) {
 171                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 172             }
 173         } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
 174             if ((server.daemonize = yesnotoi(argv[1])) == -1) {
 175                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 176             }
 177         } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) {
 178             if ((server.appendonly = yesnotoi(argv[1])) == -1) {
 179                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 180             }
 181         } else if (!strcasecmp(argv[0],"appendfilename") && argc == 2) {
 182             zfree(server.appendfilename);
 183             server.appendfilename = zstrdup(argv[1]);
 184         } else if (!strcasecmp(argv[0],"no-appendfsync-on-rewrite")
 185                    && argc == 2) {
 186             if ((server.no_appendfsync_on_rewrite= yesnotoi(argv[1])) == -1) {
 187                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 188             }
 189         } else if (!strcasecmp(argv[0],"appendfsync") && argc == 2) {
 190             if (!strcasecmp(argv[1],"no")) {
 191                 server.appendfsync = APPENDFSYNC_NO;
 192             } else if (!strcasecmp(argv[1],"always")) {
 193                 server.appendfsync = APPENDFSYNC_ALWAYS;
 194             } else if (!strcasecmp(argv[1],"everysec")) {
 195                 server.appendfsync = APPENDFSYNC_EVERYSEC;
 196             } else {
 197                 err = "argument must be 'no', 'always' or 'everysec'";
 198                 goto loaderr;
 199             }
 200         } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
 201             server.requirepass = zstrdup(argv[1]);
 202         } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
 203             zfree(server.pidfile);
 204             server.pidfile = zstrdup(argv[1]);
 205         } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
 206             zfree(server.dbfilename);
 207             server.dbfilename = zstrdup(argv[1]);
 208         } else if (!strcasecmp(argv[0],"vm-enabled") && argc == 2) {
 209             if ((server.vm_enabled = yesnotoi(argv[1])) == -1) {
 210                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 211             }
 212         } else if (!strcasecmp(argv[0],"vm-swap-file") && argc == 2) {
 213             zfree(server.vm_swap_file);
 214             server.vm_swap_file = zstrdup(argv[1]);
 215         } else if (!strcasecmp(argv[0],"vm-max-memory") && argc == 2) {
 216             server.vm_max_memory = memtoll(argv[1],NULL);
 217         } else if (!strcasecmp(argv[0],"vm-page-size") && argc == 2) {
 218             server.vm_page_size = memtoll(argv[1], NULL);
 219         } else if (!strcasecmp(argv[0],"vm-pages") && argc == 2) {
 220             server.vm_pages = memtoll(argv[1], NULL);
 221         } else if (!strcasecmp(argv[0],"vm-max-threads") && argc == 2) {
 222             server.vm_max_threads = strtoll(argv[1], NULL, 10);
 223         } else if (!strcasecmp(argv[0],"hash-max-zipmap-entries") && argc == 2) {
 224             server.hash_max_zipmap_entries = memtoll(argv[1], NULL);
 225         } else if (!strcasecmp(argv[0],"hash-max-zipmap-value") && argc == 2) {
 226             server.hash_max_zipmap_value = memtoll(argv[1], NULL);
 227         } else if (!strcasecmp(argv[0],"list-max-ziplist-entries") && argc == 2){
 228             server.list_max_ziplist_entries = memtoll(argv[1], NULL);
 229         } else if (!strcasecmp(argv[0],"list-max-ziplist-value") && argc == 2) {
 230             server.list_max_ziplist_value = memtoll(argv[1], NULL);
 231         } else if (!strcasecmp(argv[0],"set-max-intset-entries") && argc == 2) {
 232             server.set_max_intset_entries = memtoll(argv[1], NULL);
 233         } else if (!strcasecmp(argv[0],"rename-command") && argc == 3) {
 234             struct redisCommand *cmd = lookupCommand(argv[1]);
 235             int retval;
 236
 237             if (!cmd) {
 238                 err = "No such command in rename-command";
 239                 goto loaderr;
 240             }
 241
 242             /* If the target command name is the emtpy string we just
 243              * remove it from the command table. */
 244             retval = dictDelete(server.commands, argv[1]);
 245             redisAssert(retval == DICT_OK);
 246
 247             /* Otherwise we re-add the command under a different name. */
 248             if (sdslen(argv[2]) != 0) {
 249                 sds copy = sdsdup(argv[2]);
 250
 251                 retval = dictAdd(server.commands, copy, cmd);
 252                 if (retval != DICT_OK) {
 253                     sdsfree(copy);
 254                     err = "Target command name already exists"; goto loaderr;
 255                 }
 256             }
 257         } else {
 258             err = "Bad directive or wrong number of arguments"; goto loaderr;
 259         }
 260         for (j = 0; j < argc; j++)
 261             sdsfree(argv[j]);
 262         zfree(argv);
 263         sdsfree(line);
 264     }
 265     if (fp != stdin) fclose(fp);
 266     return;
 267
 268 loaderr:
 269     fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
 270     fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
 271     fprintf(stderr, ">>> '%s'\n", line);
 272     fprintf(stderr, "%s\n", err);
 273     exit(1);
 274 }
 275
 276 /*-----------------------------------------------------------------------------
 277  * CONFIG command for remote configuration
 278  *----------------------------------------------------------------------------*/
 279
 280 void configSetCommand(redisClient *c) {
 281     robj *o;
 282     long long ll;
 283     redisAssert(c->argv[2]->encoding == REDIS_ENCODING_RAW);
 284     redisAssert(c->argv[3]->encoding == REDIS_ENCODING_RAW);
 285     o = c->argv[3];
 286
 287     if (!strcasecmp(c->argv[2]->ptr,"dbfilename")) {
 288         zfree(server.dbfilename);
 289         server.dbfilename = zstrdup(o->ptr);
 290     } else if (!strcasecmp(c->argv[2]->ptr,"requirepass")) {
 291         zfree(server.requirepass);
 292         server.requirepass = zstrdup(o->ptr);
 293     } else if (!strcasecmp(c->argv[2]->ptr,"masterauth")) {
 294         zfree(server.masterauth);
 295         server.masterauth = zstrdup(o->ptr);
 296     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory")) {
 297         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 298             ll < 0) goto badfmt;
 299         server.maxmemory = ll;
 300         if (server.maxmemory) freeMemoryIfNeeded();
 301     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-policy")) {
 302         if (!strcasecmp(o->ptr,"volatile-lru")) {
 303             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
 304         } else if (!strcasecmp(o->ptr,"volatile-random")) {
 305             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
 306         } else if (!strcasecmp(o->ptr,"volatile-ttl")) {
 307             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
 308         } else if (!strcasecmp(o->ptr,"allkeys-lru")) {
 309             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
 310         } else if (!strcasecmp(o->ptr,"allkeys-random")) {
 311             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
 312         } else if (!strcasecmp(o->ptr,"noeviction")) {
 313             server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
 314         } else {
 315             goto badfmt;
 316         }
 317     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-samples")) {
 318         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 319             ll <= 0) goto badfmt;
 320         server.maxmemory_samples = ll;
 321     } else if (!strcasecmp(c->argv[2]->ptr,"timeout")) {
 322         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 323             ll < 0 || ll > LONG_MAX) goto badfmt;
 324         server.maxidletime = ll;
 325     } else if (!strcasecmp(c->argv[2]->ptr,"appendfsync")) {
 326         if (!strcasecmp(o->ptr,"no")) {
 327             server.appendfsync = APPENDFSYNC_NO;
 328         } else if (!strcasecmp(o->ptr,"everysec")) {
 329             server.appendfsync = APPENDFSYNC_EVERYSEC;
 330         } else if (!strcasecmp(o->ptr,"always")) {
 331             server.appendfsync = APPENDFSYNC_ALWAYS;
 332         } else {
 333             goto badfmt;
 334         }
 335     } else if (!strcasecmp(c->argv[2]->ptr,"no-appendfsync-on-rewrite")) {
 336         int yn = yesnotoi(o->ptr);
 337
 338         if (yn == -1) goto badfmt;
 339         server.no_appendfsync_on_rewrite = yn;
 340     } else if (!strcasecmp(c->argv[2]->ptr,"appendonly")) {
 341         int old = server.appendonly;
 342         int new = yesnotoi(o->ptr);
 343
 344         if (new == -1) goto badfmt;
 345         if (old != new) {
 346             if (new == 0) {
 347                 stopAppendOnly();
 348             } else {
 349                 if (startAppendOnly() == REDIS_ERR) {
 350                     addReplyError(c,
 351                         "Unable to turn on AOF. Check server logs.");
 352                     return;
 353                 }
 354             }
 355         }
 356     } else if (!strcasecmp(c->argv[2]->ptr,"save")) {
 357         int vlen, j;
 358         sds *v = sdssplitlen(o->ptr,sdslen(o->ptr)," ",1,&vlen);
 359
 360         /* Perform sanity check before setting the new config:
 361          * - Even number of args
 362          * - Seconds >= 1, changes >= 0 */
 363         if (vlen & 1) {
 364             sdsfreesplitres(v,vlen);
 365             goto badfmt;
 366         }
 367         for (j = 0; j < vlen; j++) {
 368             char *eptr;
 369             long val;
 370
 371             val = strtoll(v[j], &eptr, 10);
 372             if (eptr[0] != '\0' ||
 373                 ((j & 1) == 0 && val < 1) ||
 374                 ((j & 1) == 1 && val < 0)) {
 375                 sdsfreesplitres(v,vlen);
 376                 goto badfmt;
 377             }
 378         }
 379         /* Finally set the new config */
 380         resetServerSaveParams();
 381         for (j = 0; j < vlen; j += 2) {
 382             time_t seconds;
 383             int changes;
 384
 385             seconds = strtoll(v[j],NULL,10);
 386             changes = strtoll(v[j+1],NULL,10);
 387             appendServerSaveParams(seconds, changes);
 388         }
 389         sdsfreesplitres(v,vlen);
 390     } else if (!strcasecmp(c->argv[2]->ptr,"slave-serve-stale-data")) {
 391         int yn = yesnotoi(o->ptr);
 392
 393         if (yn == -1) goto badfmt;
 394         server.repl_serve_stale_data = yn;
 395     } else {
 396         addReplyErrorFormat(c,"Unsupported CONFIG parameter: %s",
 397             (char*)c->argv[2]->ptr);
 398         return;
 399     }
 400     addReply(c,shared.ok);
 401     return;
 402
 403 badfmt: /* Bad format errors */
 404     addReplyErrorFormat(c,"Invalid argument '%s' for CONFIG SET '%s'",
 405             (char*)o->ptr,
 406             (char*)c->argv[2]->ptr);
 407 }
 408
 409 void configGetCommand(redisClient *c) {
 410     robj *o = c->argv[2];
 411     void *replylen = addDeferredMultiBulkLength(c);
 412     char *pattern = o->ptr;
 413     char buf[128];
 414     int matches = 0;
 415     redisAssert(o->encoding == REDIS_ENCODING_RAW);
 416
 417     if (stringmatch(pattern,"dbfilename",0)) {
 418         addReplyBulkCString(c,"dbfilename");
 419         addReplyBulkCString(c,server.dbfilename);
 420         matches++;
 421     }
 422     if (stringmatch(pattern,"requirepass",0)) {
 423         addReplyBulkCString(c,"requirepass");
 424         addReplyBulkCString(c,server.requirepass);
 425         matches++;
 426     }
 427     if (stringmatch(pattern,"masterauth",0)) {
 428         addReplyBulkCString(c,"masterauth");
 429         addReplyBulkCString(c,server.masterauth);
 430         matches++;
 431     }
 432     if (stringmatch(pattern,"maxmemory",0)) {
 433         ll2string(buf,sizeof(buf),server.maxmemory);
 434         addReplyBulkCString(c,"maxmemory");
 435         addReplyBulkCString(c,buf);
 436         matches++;
 437     }
 438     if (stringmatch(pattern,"maxmemory-policy",0)) {
 439         char *s;
 440
 441         switch(server.maxmemory_policy) {
 442         case REDIS_MAXMEMORY_VOLATILE_LRU: s = "volatile-lru"; break;
 443         case REDIS_MAXMEMORY_VOLATILE_TTL: s = "volatile-ttl"; break;
 444         case REDIS_MAXMEMORY_VOLATILE_RANDOM: s = "volatile-random"; break;
 445         case REDIS_MAXMEMORY_ALLKEYS_LRU: s = "allkeys-lru"; break;
 446         case REDIS_MAXMEMORY_ALLKEYS_RANDOM: s = "allkeys-random"; break;
 447         case REDIS_MAXMEMORY_NO_EVICTION: s = "noeviction"; break;
 448         default: s = "unknown"; break; /* too harmless to panic */
 449         }
 450         addReplyBulkCString(c,"maxmemory-policy");
 451         addReplyBulkCString(c,s);
 452         matches++;
 453     }
 454     if (stringmatch(pattern,"maxmemory-samples",0)) {
 455         ll2string(buf,sizeof(buf),server.maxmemory_samples);
 456         addReplyBulkCString(c,"maxmemory-samples");
 457         addReplyBulkCString(c,buf);
 458         matches++;
 459     }
 460     if (stringmatch(pattern,"timeout",0)) {
 461         ll2string(buf,sizeof(buf),server.maxidletime);
 462         addReplyBulkCString(c,"timeout");
 463         addReplyBulkCString(c,buf);
 464         matches++;
 465     }
 466     if (stringmatch(pattern,"appendonly",0)) {
 467         addReplyBulkCString(c,"appendonly");
 468         addReplyBulkCString(c,server.appendonly ? "yes" : "no");
 469         matches++;
 470     }
 471     if (stringmatch(pattern,"no-appendfsync-on-rewrite",0)) {
 472         addReplyBulkCString(c,"no-appendfsync-on-rewrite");
 473         addReplyBulkCString(c,server.no_appendfsync_on_rewrite ? "yes" : "no");
 474         matches++;
 475     }
 476     if (stringmatch(pattern,"appendfsync",0)) {
 477         char *policy;
 478
 479         switch(server.appendfsync) {
 480         case APPENDFSYNC_NO: policy = "no"; break;
 481         case APPENDFSYNC_EVERYSEC: policy = "everysec"; break;
 482         case APPENDFSYNC_ALWAYS: policy = "always"; break;
 483         default: policy = "unknown"; break; /* too harmless to panic */
 484         }
 485         addReplyBulkCString(c,"appendfsync");
 486         addReplyBulkCString(c,policy);
 487         matches++;
 488     }
 489     if (stringmatch(pattern,"save",0)) {
 490         sds buf = sdsempty();
 491         int j;
 492
 493         for (j = 0; j < server.saveparamslen; j++) {
 494             buf = sdscatprintf(buf,"%ld %d",
 495                     server.saveparams[j].seconds,
 496                     server.saveparams[j].changes);
 497             if (j != server.saveparamslen-1)
 498                 buf = sdscatlen(buf," ",1);
 499         }
 500         addReplyBulkCString(c,"save");
 501         addReplyBulkCString(c,buf);
 502         sdsfree(buf);
 503         matches++;
 504     }
 505     if (stringmatch(pattern,"slave-serve-stale-data",0)) {
 506         addReplyBulkCString(c,"slave-serve-stale-data");
 507         addReplyBulkCString(c,server.repl_serve_stale_data ? "yes" : "no");
 508         matches++;
 509     }
 510     setDeferredMultiBulkLength(c,replylen,matches*2);
 511 }
 512
 513 void configCommand(redisClient *c) {
 514     if (!strcasecmp(c->argv[1]->ptr,"set")) {
 515         if (c->argc != 4) goto badarity;
 516         configSetCommand(c);
 517     } else if (!strcasecmp(c->argv[1]->ptr,"get")) {
 518         if (c->argc != 3) goto badarity;
 519         configGetCommand(c);
 520     } else if (!strcasecmp(c->argv[1]->ptr,"resetstat")) {
 521         if (c->argc != 2) goto badarity;
 522         server.stat_keyspace_hits = 0;
 523         server.stat_keyspace_misses = 0;
 524         server.stat_numcommands = 0;
 525         server.stat_numconnections = 0;
 526         server.stat_expiredkeys = 0;
 527         addReply(c,shared.ok);
 528     } else {
 529         addReplyError(c,
 530             "CONFIG subcommand must be one of GET, SET, RESETSTAT");
 531     }
 532     return;
 533
 534 badarity:
 535     addReplyErrorFormat(c,"Wrong number of arguments for CONFIG %s",
 536         (char*) c->argv[1]->ptr);
 537 }