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