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],"syslog-enabled") && argc == 2) {
 118             if ((server.syslog_enabled = yesnotoi(argv[1])) == -1) {
 119                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 120             }
 121         } else if (!strcasecmp(argv[0],"syslog-ident") && argc == 2) {
 122             if (server.syslog_ident) zfree(server.syslog_ident);
 123             server.syslog_ident = zstrdup(argv[1]);
 124         } else if (!strcasecmp(argv[0],"syslog-facility") && argc == 2) {
 125             struct {
 126                 const char     *name;
 127                 const int       value;
 128             } validSyslogFacilities[] = {
 129                 {"user",    LOG_USER},
 130                 {"local0",  LOG_LOCAL0},
 131                 {"local1",  LOG_LOCAL1},
 132                 {"local2",  LOG_LOCAL2},
 133                 {"local3",  LOG_LOCAL3},
 134                 {"local4",  LOG_LOCAL4},
 135                 {"local5",  LOG_LOCAL5},
 136                 {"local6",  LOG_LOCAL6},
 137                 {"local7",  LOG_LOCAL7},
 138                 {NULL, 0}
 139             };
 140             int i;
 141
 142             for (i = 0; validSyslogFacilities[i].name; i++) {
 143                 if (!strcasecmp(validSyslogFacilities[i].name, argv[1])) {
 144                     server.syslog_facility = validSyslogFacilities[i].value;
 145                     break;
 146                 }
 147             }
 148
 149             if (!validSyslogFacilities[i].name) {
 150                 err = "Invalid log facility. Must be one of USER or between LOCAL0-LOCAL7";
 151                 goto loaderr;
 152             }
 153         } else if (!strcasecmp(argv[0],"databases") && argc == 2) {
 154             server.dbnum = atoi(argv[1]);
 155             if (server.dbnum < 1) {
 156                 err = "Invalid number of databases"; goto loaderr;
 157             }
 158         } else if (!strcasecmp(argv[0],"include") && argc == 2) {
 159             loadServerConfig(argv[1]);
 160         } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
 161             server.maxclients = atoi(argv[1]);
 162         } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
 163             server.maxmemory = memtoll(argv[1],NULL);
 164         } else if (!strcasecmp(argv[0],"maxmemory-policy") && argc == 2) {
 165             if (!strcasecmp(argv[1],"volatile-lru")) {
 166                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
 167             } else if (!strcasecmp(argv[1],"volatile-random")) {
 168                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
 169             } else if (!strcasecmp(argv[1],"volatile-ttl")) {
 170                 server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
 171             } else if (!strcasecmp(argv[1],"allkeys-lru")) {
 172                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
 173             } else if (!strcasecmp(argv[1],"allkeys-random")) {
 174                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
 175             } else if (!strcasecmp(argv[1],"noeviction")) {
 176                 server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
 177             } else {
 178                 err = "Invalid maxmemory policy";
 179                 goto loaderr;
 180             }
 181         } else if (!strcasecmp(argv[0],"maxmemory-samples") && argc == 2) {
 182             server.maxmemory_samples = atoi(argv[1]);
 183             if (server.maxmemory_samples <= 0) {
 184                 err = "maxmemory-samples must be 1 or greater";
 185                 goto loaderr;
 186             }
 187         } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
 188             server.masterhost = sdsnew(argv[1]);
 189             server.masterport = atoi(argv[2]);
 190             server.replstate = REDIS_REPL_CONNECT;
 191         } else if (!strcasecmp(argv[0],"masterauth") && argc == 2) {
 192                 server.masterauth = zstrdup(argv[1]);
 193         } else if (!strcasecmp(argv[0],"slave-serve-stale-data") && argc == 2) {
 194             if ((server.repl_serve_stale_data = yesnotoi(argv[1])) == -1) {
 195                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 196             }
 197         } else if (!strcasecmp(argv[0],"glueoutputbuf")) {
 198             redisLog(REDIS_WARNING, "Deprecated configuration directive: \"%s\"", argv[0]);
 199         } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
 200             if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
 201                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 202             }
 203         } else if (!strcasecmp(argv[0],"activerehashing") && argc == 2) {
 204             if ((server.activerehashing = yesnotoi(argv[1])) == -1) {
 205                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 206             }
 207         } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
 208             if ((server.daemonize = yesnotoi(argv[1])) == -1) {
 209                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 210             }
 211         } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) {
 212             if ((server.appendonly = yesnotoi(argv[1])) == -1) {
 213                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 214             }
 215         } else if (!strcasecmp(argv[0],"appendfilename") && argc == 2) {
 216             zfree(server.appendfilename);
 217             server.appendfilename = zstrdup(argv[1]);
 218         } else if (!strcasecmp(argv[0],"no-appendfsync-on-rewrite")
 219                    && argc == 2) {
 220             if ((server.no_appendfsync_on_rewrite= yesnotoi(argv[1])) == -1) {
 221                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 222             }
 223         } else if (!strcasecmp(argv[0],"appendfsync") && argc == 2) {
 224             if (!strcasecmp(argv[1],"no")) {
 225                 server.appendfsync = APPENDFSYNC_NO;
 226             } else if (!strcasecmp(argv[1],"always")) {
 227                 server.appendfsync = APPENDFSYNC_ALWAYS;
 228             } else if (!strcasecmp(argv[1],"everysec")) {
 229                 server.appendfsync = APPENDFSYNC_EVERYSEC;
 230             } else {
 231                 err = "argument must be 'no', 'always' or 'everysec'";
 232                 goto loaderr;
 233             }
 234         } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
 235             server.requirepass = zstrdup(argv[1]);
 236         } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
 237             zfree(server.pidfile);
 238             server.pidfile = zstrdup(argv[1]);
 239         } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
 240             zfree(server.dbfilename);
 241             server.dbfilename = zstrdup(argv[1]);
 242         } else if (!strcasecmp(argv[0],"diskstore-enabled") && argc == 2) {
 243             if ((server.ds_enabled = yesnotoi(argv[1])) == -1) {
 244                 err = "argument must be 'yes' or 'no'"; goto loaderr;
 245             }
 246         } else if (!strcasecmp(argv[0],"diskstore-path") && argc == 2) {
 247             sdsfree(server.ds_path);
 248             server.ds_path = sdsnew(argv[1]);
 249         } else if (!strcasecmp(argv[0],"cache-max-memory") && argc == 2) {
 250             server.cache_max_memory = memtoll(argv[1],NULL);
 251         } else if (!strcasecmp(argv[0],"cache-flush-delay") && argc == 2) {
 252             server.cache_flush_delay = atoi(argv[1]);
 253             if (server.cache_flush_delay < 0) server.cache_flush_delay = 0;
 254         } else if (!strcasecmp(argv[0],"hash-max-zipmap-entries") && argc == 2) {
 255             server.hash_max_zipmap_entries = memtoll(argv[1], NULL);
 256         } else if (!strcasecmp(argv[0],"hash-max-zipmap-value") && argc == 2) {
 257             server.hash_max_zipmap_value = memtoll(argv[1], NULL);
 258         } else if (!strcasecmp(argv[0],"list-max-ziplist-entries") && argc == 2){
 259             server.list_max_ziplist_entries = memtoll(argv[1], NULL);
 260         } else if (!strcasecmp(argv[0],"list-max-ziplist-value") && argc == 2) {
 261             server.list_max_ziplist_value = memtoll(argv[1], NULL);
 262         } else if (!strcasecmp(argv[0],"set-max-intset-entries") && argc == 2) {
 263             server.set_max_intset_entries = memtoll(argv[1], NULL);
 264         } else if (!strcasecmp(argv[0],"rename-command") && argc == 3) {
 265             struct redisCommand *cmd = lookupCommand(argv[1]);
 266             int retval;
 267
 268             if (!cmd) {
 269                 err = "No such command in rename-command";
 270                 goto loaderr;
 271             }
 272
 273             /* If the target command name is the emtpy string we just
 274              * remove it from the command table. */
 275             retval = dictDelete(server.commands, argv[1]);
 276             redisAssert(retval == DICT_OK);
 277
 278             /* Otherwise we re-add the command under a different name. */
 279             if (sdslen(argv[2]) != 0) {
 280                 sds copy = sdsdup(argv[2]);
 281
 282                 retval = dictAdd(server.commands, copy, cmd);
 283                 if (retval != DICT_OK) {
 284                     sdsfree(copy);
 285                     err = "Target command name already exists"; goto loaderr;
 286                 }
 287             }
 288         } else {
 289             err = "Bad directive or wrong number of arguments"; goto loaderr;
 290         }
 291         for (j = 0; j < argc; j++)
 292             sdsfree(argv[j]);
 293         zfree(argv);
 294         sdsfree(line);
 295     }
 296     if (fp != stdin) fclose(fp);
 297     return;
 298
 299 loaderr:
 300     fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
 301     fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
 302     fprintf(stderr, ">>> '%s'\n", line);
 303     fprintf(stderr, "%s\n", err);
 304     exit(1);
 305 }
 306
 307 /*-----------------------------------------------------------------------------
 308  * CONFIG command for remote configuration
 309  *----------------------------------------------------------------------------*/
 310
 311 void configSetCommand(redisClient *c) {
 312     robj *o;
 313     long long ll;
 314     redisAssert(c->argv[2]->encoding == REDIS_ENCODING_RAW);
 315     redisAssert(c->argv[3]->encoding == REDIS_ENCODING_RAW);
 316     o = c->argv[3];
 317
 318     if (!strcasecmp(c->argv[2]->ptr,"dbfilename")) {
 319         zfree(server.dbfilename);
 320         server.dbfilename = zstrdup(o->ptr);
 321     } else if (!strcasecmp(c->argv[2]->ptr,"requirepass")) {
 322         zfree(server.requirepass);
 323         server.requirepass = zstrdup(o->ptr);
 324     } else if (!strcasecmp(c->argv[2]->ptr,"masterauth")) {
 325         zfree(server.masterauth);
 326         server.masterauth = zstrdup(o->ptr);
 327     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory")) {
 328         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 329             ll < 0) goto badfmt;
 330         server.maxmemory = ll;
 331         if (server.maxmemory) freeMemoryIfNeeded();
 332     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-policy")) {
 333         if (!strcasecmp(o->ptr,"volatile-lru")) {
 334             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
 335         } else if (!strcasecmp(o->ptr,"volatile-random")) {
 336             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
 337         } else if (!strcasecmp(o->ptr,"volatile-ttl")) {
 338             server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
 339         } else if (!strcasecmp(o->ptr,"allkeys-lru")) {
 340             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
 341         } else if (!strcasecmp(o->ptr,"allkeys-random")) {
 342             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
 343         } else if (!strcasecmp(o->ptr,"noeviction")) {
 344             server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
 345         } else {
 346             goto badfmt;
 347         }
 348     } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-samples")) {
 349         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 350             ll <= 0) goto badfmt;
 351         server.maxmemory_samples = ll;
 352     } else if (!strcasecmp(c->argv[2]->ptr,"timeout")) {
 353         if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
 354             ll < 0 || ll > LONG_MAX) goto badfmt;
 355         server.maxidletime = ll;
 356     } else if (!strcasecmp(c->argv[2]->ptr,"appendfsync")) {
 357         if (!strcasecmp(o->ptr,"no")) {
 358             server.appendfsync = APPENDFSYNC_NO;
 359         } else if (!strcasecmp(o->ptr,"everysec")) {
 360             server.appendfsync = APPENDFSYNC_EVERYSEC;
 361         } else if (!strcasecmp(o->ptr,"always")) {
 362             server.appendfsync = APPENDFSYNC_ALWAYS;
 363         } else {
 364             goto badfmt;
 365         }
 366     } else if (!strcasecmp(c->argv[2]->ptr,"no-appendfsync-on-rewrite")) {
 367         int yn = yesnotoi(o->ptr);
 368
 369         if (yn == -1) goto badfmt;
 370         server.no_appendfsync_on_rewrite = yn;
 371     } else if (!strcasecmp(c->argv[2]->ptr,"appendonly")) {
 372         int old = server.appendonly;
 373         int new = yesnotoi(o->ptr);
 374
 375         if (new == -1) goto badfmt;
 376         if (old != new) {
 377             if (new == 0) {
 378                 stopAppendOnly();
 379             } else {
 380                 if (startAppendOnly() == REDIS_ERR) {
 381                     addReplyError(c,
 382                         "Unable to turn on AOF. Check server logs.");
 383                     return;
 384                 }
 385             }
 386         }
 387     } else if (!strcasecmp(c->argv[2]->ptr,"save")) {
 388         int vlen, j;
 389         sds *v = sdssplitlen(o->ptr,sdslen(o->ptr)," ",1,&vlen);
 390
 391         /* Perform sanity check before setting the new config:
 392          * - Even number of args
 393          * - Seconds >= 1, changes >= 0 */
 394         if (vlen & 1) {
 395             sdsfreesplitres(v,vlen);
 396             goto badfmt;
 397         }
 398         for (j = 0; j < vlen; j++) {
 399             char *eptr;
 400             long val;
 401
 402             val = strtoll(v[j], &eptr, 10);
 403             if (eptr[0] != '\0' ||
 404                 ((j & 1) == 0 && val < 1) ||
 405                 ((j & 1) == 1 && val < 0)) {
 406                 sdsfreesplitres(v,vlen);
 407                 goto badfmt;
 408             }
 409         }
 410         /* Finally set the new config */
 411         resetServerSaveParams();
 412         for (j = 0; j < vlen; j += 2) {
 413             time_t seconds;
 414             int changes;
 415
 416             seconds = strtoll(v[j],NULL,10);
 417             changes = strtoll(v[j+1],NULL,10);
 418             appendServerSaveParams(seconds, changes);
 419         }
 420         sdsfreesplitres(v,vlen);
 421     } else if (!strcasecmp(c->argv[2]->ptr,"slave-serve-stale-data")) {
 422         int yn = yesnotoi(o->ptr);
 423
 424         if (yn == -1) goto badfmt;
 425         server.repl_serve_stale_data = yn;
 426     } else {
 427         addReplyErrorFormat(c,"Unsupported CONFIG parameter: %s",
 428             (char*)c->argv[2]->ptr);
 429         return;
 430     }
 431     addReply(c,shared.ok);
 432     return;
 433
 434 badfmt: /* Bad format errors */
 435     addReplyErrorFormat(c,"Invalid argument '%s' for CONFIG SET '%s'",
 436             (char*)o->ptr,
 437             (char*)c->argv[2]->ptr);
 438 }
 439
 440 void configGetCommand(redisClient *c) {
 441     robj *o = c->argv[2];
 442     void *replylen = addDeferredMultiBulkLength(c);
 443     char *pattern = o->ptr;
 444     char buf[128];
 445     int matches = 0;
 446     redisAssert(o->encoding == REDIS_ENCODING_RAW);
 447
 448     if (stringmatch(pattern,"dbfilename",0)) {
 449         addReplyBulkCString(c,"dbfilename");
 450         addReplyBulkCString(c,server.dbfilename);
 451         matches++;
 452     }
 453     if (stringmatch(pattern,"requirepass",0)) {
 454         addReplyBulkCString(c,"requirepass");
 455         addReplyBulkCString(c,server.requirepass);
 456         matches++;
 457     }
 458     if (stringmatch(pattern,"masterauth",0)) {
 459         addReplyBulkCString(c,"masterauth");
 460         addReplyBulkCString(c,server.masterauth);
 461         matches++;
 462     }
 463     if (stringmatch(pattern,"maxmemory",0)) {
 464         ll2string(buf,sizeof(buf),server.maxmemory);
 465         addReplyBulkCString(c,"maxmemory");
 466         addReplyBulkCString(c,buf);
 467         matches++;
 468     }
 469     if (stringmatch(pattern,"maxmemory-policy",0)) {
 470         char *s;
 471
 472         switch(server.maxmemory_policy) {
 473         case REDIS_MAXMEMORY_VOLATILE_LRU: s = "volatile-lru"; break;
 474         case REDIS_MAXMEMORY_VOLATILE_TTL: s = "volatile-ttl"; break;
 475         case REDIS_MAXMEMORY_VOLATILE_RANDOM: s = "volatile-random"; break;
 476         case REDIS_MAXMEMORY_ALLKEYS_LRU: s = "allkeys-lru"; break;
 477         case REDIS_MAXMEMORY_ALLKEYS_RANDOM: s = "allkeys-random"; break;
 478         case REDIS_MAXMEMORY_NO_EVICTION: s = "noeviction"; break;
 479         default: s = "unknown"; break; /* too harmless to panic */
 480         }
 481         addReplyBulkCString(c,"maxmemory-policy");
 482         addReplyBulkCString(c,s);
 483         matches++;
 484     }
 485     if (stringmatch(pattern,"maxmemory-samples",0)) {
 486         ll2string(buf,sizeof(buf),server.maxmemory_samples);
 487         addReplyBulkCString(c,"maxmemory-samples");
 488         addReplyBulkCString(c,buf);
 489         matches++;
 490     }
 491     if (stringmatch(pattern,"timeout",0)) {
 492         ll2string(buf,sizeof(buf),server.maxidletime);
 493         addReplyBulkCString(c,"timeout");
 494         addReplyBulkCString(c,buf);
 495         matches++;
 496     }
 497     if (stringmatch(pattern,"appendonly",0)) {
 498         addReplyBulkCString(c,"appendonly");
 499         addReplyBulkCString(c,server.appendonly ? "yes" : "no");
 500         matches++;
 501     }
 502     if (stringmatch(pattern,"no-appendfsync-on-rewrite",0)) {
 503         addReplyBulkCString(c,"no-appendfsync-on-rewrite");
 504         addReplyBulkCString(c,server.no_appendfsync_on_rewrite ? "yes" : "no");
 505         matches++;
 506     }
 507     if (stringmatch(pattern,"appendfsync",0)) {
 508         char *policy;
 509
 510         switch(server.appendfsync) {
 511         case APPENDFSYNC_NO: policy = "no"; break;
 512         case APPENDFSYNC_EVERYSEC: policy = "everysec"; break;
 513         case APPENDFSYNC_ALWAYS: policy = "always"; break;
 514         default: policy = "unknown"; break; /* too harmless to panic */
 515         }
 516         addReplyBulkCString(c,"appendfsync");
 517         addReplyBulkCString(c,policy);
 518         matches++;
 519     }
 520     if (stringmatch(pattern,"save",0)) {
 521         sds buf = sdsempty();
 522         int j;
 523
 524         for (j = 0; j < server.saveparamslen; j++) {
 525             buf = sdscatprintf(buf,"%ld %d",
 526                     server.saveparams[j].seconds,
 527                     server.saveparams[j].changes);
 528             if (j != server.saveparamslen-1)
 529                 buf = sdscatlen(buf," ",1);
 530         }
 531         addReplyBulkCString(c,"save");
 532         addReplyBulkCString(c,buf);
 533         sdsfree(buf);
 534         matches++;
 535     }
 536     if (stringmatch(pattern,"slave-serve-stale-data",0)) {
 537         addReplyBulkCString(c,"slave-serve-stale-data");
 538         addReplyBulkCString(c,server.repl_serve_stale_data ? "yes" : "no");
 539         matches++;
 540     }
 541     setDeferredMultiBulkLength(c,replylen,matches*2);
 542 }
 543
 544 void configCommand(redisClient *c) {
 545     if (!strcasecmp(c->argv[1]->ptr,"set")) {
 546         if (c->argc != 4) goto badarity;
 547         configSetCommand(c);
 548     } else if (!strcasecmp(c->argv[1]->ptr,"get")) {
 549         if (c->argc != 3) goto badarity;
 550         configGetCommand(c);
 551     } else if (!strcasecmp(c->argv[1]->ptr,"resetstat")) {
 552         if (c->argc != 2) goto badarity;
 553         server.stat_keyspace_hits = 0;
 554         server.stat_keyspace_misses = 0;
 555         server.stat_numcommands = 0;
 556         server.stat_numconnections = 0;
 557         server.stat_expiredkeys = 0;
 558         addReply(c,shared.ok);
 559     } else {
 560         addReplyError(c,
 561             "CONFIG subcommand must be one of GET, SET, RESETSTAT");
 562     }
 563     return;
 564
 565 badarity:
 566     addReplyErrorFormat(c,"Wrong number of arguments for CONFIG %s",
 567         (char*) c->argv[1]->ptr);
 568 }