config.c

#include "redis.h"

/*-----------------------------------------------------------------------------
 * Config file parsing
 *----------------------------------------------------------------------------*/

int yesnotoi(char *s) {
    if (!strcasecmp(s,"yes")) return 1;
    else if (!strcasecmp(s,"no")) return 0;
    else return -1;
}

void appendServerSaveParams(time_t seconds, int changes) {
    server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1));
    server.saveparams[server.saveparamslen].seconds = seconds;
    server.saveparams[server.saveparamslen].changes = changes;
    server.saveparamslen++;
}

void resetServerSaveParams() {
    zfree(server.saveparams);
    server.saveparams = NULL;
    server.saveparamslen = 0;
}

/* I agree, this is a very rudimental way to load a configuration...
   will improve later if the config gets more complex */
void loadServerConfig(char *filename) {
    FILE *fp;
    char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL;
    int linenum = 0;
    sds line = NULL;

    if (filename[0] == '-' && filename[1] == '\0')
        fp = stdin;
    else {
        if ((fp = fopen(filename,"r")) == NULL) {
            redisLog(REDIS_WARNING, "Fatal error, can't open config file '%s'", filename);
            exit(1);
        }
    }

    while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) {
        sds *argv;
        int argc, j;

        linenum++;
        line = sdsnew(buf);
        line = sdstrim(line," \t\r\n");

        /* Skip comments and blank lines*/
        if (line[0] == '#' || line[0] == '\0') {
            sdsfree(line);
            continue;
        }

        /* Split into arguments */
        argv = sdssplitargs(line,&argc);
        sdstolower(argv[0]);

        /* Execute config directives */
        if (!strcasecmp(argv[0],"timeout") && argc == 2) {
            server.maxidletime = atoi(argv[1]);
            if (server.maxidletime < 0) {
                err = "Invalid timeout value"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"port") && argc == 2) {
            server.port = atoi(argv[1]);
            if (server.port < 0 || server.port > 65535) {
                err = "Invalid port"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"bind") && argc == 2) {
            server.bindaddr = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"unixsocket") && argc == 2) {
            server.unixsocket = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"unixsocketperm") && argc == 2) {
            server.unixsocketperm = (mode_t)strtol(argv[1], NULL, 8);
            if (errno || server.unixsocketperm > 0777) {
                err = "Invalid socket file permissions"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"save") && argc == 3) {
            int seconds = atoi(argv[1]);
            int changes = atoi(argv[2]);
            if (seconds < 1 || changes < 0) {
                err = "Invalid save parameters"; goto loaderr;
            }
            appendServerSaveParams(seconds,changes);
        } else if (!strcasecmp(argv[0],"dir") && argc == 2) {
            if (chdir(argv[1]) == -1) {
                redisLog(REDIS_WARNING,"Can't chdir to '%s': %s",
                    argv[1], strerror(errno));
                exit(1);
            }
        } else if (!strcasecmp(argv[0],"loglevel") && argc == 2) {
            if (!strcasecmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG;
            else if (!strcasecmp(argv[1],"verbose")) server.verbosity = REDIS_VERBOSE;
            else if (!strcasecmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE;
            else if (!strcasecmp(argv[1],"warning")) server.verbosity = REDIS_WARNING;
            else {
                err = "Invalid log level. Must be one of debug, notice, warning";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
            FILE *logfp;

            server.logfile = zstrdup(argv[1]);
            if (!strcasecmp(server.logfile,"stdout")) {
                zfree(server.logfile);
                server.logfile = NULL;
            }
            if (server.logfile) {
                /* Test if we are able to open the file. The server will not
                 * be able to abort just for this problem later... */
                logfp = fopen(server.logfile,"a");
                if (logfp == NULL) {
                    err = sdscatprintf(sdsempty(),
                        "Can't open the log file: %s", strerror(errno));
                    goto loaderr;
                }
                fclose(logfp);
            }
        } else if (!strcasecmp(argv[0],"syslog-enabled") && argc == 2) {
            if ((server.syslog_enabled = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"syslog-ident") && argc == 2) {
            if (server.syslog_ident) zfree(server.syslog_ident);
            server.syslog_ident = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"syslog-facility") && argc == 2) {
            struct {
                const char     *name;
                const int       value;
            } validSyslogFacilities[] = {
                {"user",    LOG_USER},
                {"local0",  LOG_LOCAL0},
                {"local1",  LOG_LOCAL1},
                {"local2",  LOG_LOCAL2},
                {"local3",  LOG_LOCAL3},
                {"local4",  LOG_LOCAL4},
                {"local5",  LOG_LOCAL5},
                {"local6",  LOG_LOCAL6},
                {"local7",  LOG_LOCAL7},
                {NULL, 0}
            };
            int i;

            for (i = 0; validSyslogFacilities[i].name; i++) {
                if (!strcasecmp(validSyslogFacilities[i].name, argv[1])) {
                    server.syslog_facility = validSyslogFacilities[i].value;
                    break;
                }
            }

            if (!validSyslogFacilities[i].name) {
                err = "Invalid log facility. Must be one of USER or between LOCAL0-LOCAL7";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"databases") && argc == 2) {
            server.dbnum = atoi(argv[1]);
            if (server.dbnum < 1) {
                err = "Invalid number of databases"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"include") && argc == 2) {
            loadServerConfig(argv[1]);
        } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
            server.maxclients = atoi(argv[1]);
        } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
            server.maxmemory = memtoll(argv[1],NULL);
        } else if (!strcasecmp(argv[0],"maxmemory-policy") && argc == 2) {
            if (!strcasecmp(argv[1],"volatile-lru")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
            } else if (!strcasecmp(argv[1],"volatile-random")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
            } else if (!strcasecmp(argv[1],"volatile-ttl")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
            } else if (!strcasecmp(argv[1],"allkeys-lru")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
            } else if (!strcasecmp(argv[1],"allkeys-random")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
            } else if (!strcasecmp(argv[1],"noeviction")) {
                server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
            } else {
                err = "Invalid maxmemory policy";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"maxmemory-samples") && argc == 2) {
            server.maxmemory_samples = atoi(argv[1]);
            if (server.maxmemory_samples <= 0) {
                err = "maxmemory-samples must be 1 or greater";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
            server.masterhost = sdsnew(argv[1]);
            server.masterport = atoi(argv[2]);
            server.replstate = REDIS_REPL_CONNECT;
        } else if (!strcasecmp(argv[0],"masterauth") && argc == 2) {
        	server.masterauth = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"slave-serve-stale-data") && argc == 2) {
            if ((server.repl_serve_stale_data = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"glueoutputbuf")) {
            redisLog(REDIS_WARNING, "Deprecated configuration directive: \"%s\"", argv[0]);
        } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
            if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"activerehashing") && argc == 2) {
            if ((server.activerehashing = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
            if ((server.daemonize = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) {
            if ((server.appendonly = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"appendfilename") && argc == 2) {
            zfree(server.appendfilename);
            server.appendfilename = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"no-appendfsync-on-rewrite")
                   && argc == 2) {
            if ((server.no_appendfsync_on_rewrite= yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"appendfsync") && argc == 2) {
            if (!strcasecmp(argv[1],"no")) {
                server.appendfsync = APPENDFSYNC_NO;
            } else if (!strcasecmp(argv[1],"always")) {
                server.appendfsync = APPENDFSYNC_ALWAYS;
            } else if (!strcasecmp(argv[1],"everysec")) {
                server.appendfsync = APPENDFSYNC_EVERYSEC;
            } else {
                err = "argument must be 'no', 'always' or 'everysec'";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"auto-aof-rewrite-percentage") &&
                   argc == 2)
        {
            server.auto_aofrewrite_perc = atoi(argv[1]);
            if (server.auto_aofrewrite_perc < 0) {
                err = "Invalid negative percentage for AOF auto rewrite";
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"auto-aof-rewrite-min-size") &&
                   argc == 2)
        {
            server.auto_aofrewrite_min_size = memtoll(argv[1],NULL);
        } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
            server.requirepass = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
            zfree(server.pidfile);
            server.pidfile = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
            zfree(server.dbfilename);
            server.dbfilename = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"hash-max-zipmap-entries") && argc == 2) {
            server.hash_max_zipmap_entries = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"hash-max-zipmap-value") && argc == 2) {
            server.hash_max_zipmap_value = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"list-max-ziplist-entries") && argc == 2){
            server.list_max_ziplist_entries = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"list-max-ziplist-value") && argc == 2) {
            server.list_max_ziplist_value = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"set-max-intset-entries") && argc == 2) {
            server.set_max_intset_entries = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"zset-max-ziplist-entries") && argc == 2) {
            server.zset_max_ziplist_entries = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"zset-max-ziplist-value") && argc == 2) {
            server.zset_max_ziplist_value = memtoll(argv[1], NULL);
        } else if (!strcasecmp(argv[0],"rename-command") && argc == 3) {
            struct redisCommand *cmd = lookupCommand(argv[1]);
            int retval;

            if (!cmd) {
                err = "No such command in rename-command";
                goto loaderr;
            }

            /* If the target command name is the emtpy string we just
             * remove it from the command table. */
            retval = dictDelete(server.commands, argv[1]);
            redisAssert(retval == DICT_OK);

            /* Otherwise we re-add the command under a different name. */
            if (sdslen(argv[2]) != 0) {
                sds copy = sdsdup(argv[2]);

                retval = dictAdd(server.commands, copy, cmd);
                if (retval != DICT_OK) {
                    sdsfree(copy);
                    err = "Target command name already exists"; goto loaderr;
                }
            }
        } else if (!strcasecmp(argv[0],"cluster-enabled") && argc == 2) {
            if ((server.cluster_enabled = yesnotoi(argv[1])) == -1) {
                err = "argument must be 'yes' or 'no'"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"cluster-config-file") && argc == 2) {
            zfree(server.cluster.configfile);
            server.cluster.configfile = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"lua-time-limit") && argc == 2) {
            server.lua_time_limit = strtoll(argv[1],NULL,10);
        } else if (!strcasecmp(argv[0],"slowlog-log-slower-than") &&
                   argc == 2)
        {
            server.slowlog_log_slower_than = strtoll(argv[1],NULL,10);
        } else if (!strcasecmp(argv[0],"slowlog-max-len") && argc == 2) {
            server.slowlog_max_len = strtoll(argv[1],NULL,10);
        } else {
            err = "Bad directive or wrong number of arguments"; goto loaderr;
        }
        for (j = 0; j < argc; j++)
            sdsfree(argv[j]);
        zfree(argv);
        sdsfree(line);
    }
    if (fp != stdin) fclose(fp);
    return;

loaderr:
    fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
    fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
    fprintf(stderr, ">>> '%s'\n", line);
    fprintf(stderr, "%s\n", err);
    exit(1);
}

/*-----------------------------------------------------------------------------
 * CONFIG command for remote configuration
 *----------------------------------------------------------------------------*/

void configSetCommand(redisClient *c) {
    robj *o;
    long long ll;
    redisAssertWithInfo(c,c->argv[2],c->argv[2]->encoding == REDIS_ENCODING_RAW);
    redisAssertWithInfo(c,c->argv[2],c->argv[3]->encoding == REDIS_ENCODING_RAW);
    o = c->argv[3];

    if (!strcasecmp(c->argv[2]->ptr,"dbfilename")) {
        zfree(server.dbfilename);
        server.dbfilename = zstrdup(o->ptr);
    } else if (!strcasecmp(c->argv[2]->ptr,"requirepass")) {
        zfree(server.requirepass);
        server.requirepass = zstrdup(o->ptr);
    } else if (!strcasecmp(c->argv[2]->ptr,"masterauth")) {
        zfree(server.masterauth);
        server.masterauth = zstrdup(o->ptr);
    } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
            ll < 0) goto badfmt;
        server.maxmemory = ll;
        if (server.maxmemory) freeMemoryIfNeeded();
    } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-policy")) {
        if (!strcasecmp(o->ptr,"volatile-lru")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_LRU;
        } else if (!strcasecmp(o->ptr,"volatile-random")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_RANDOM;
        } else if (!strcasecmp(o->ptr,"volatile-ttl")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_VOLATILE_TTL;
        } else if (!strcasecmp(o->ptr,"allkeys-lru")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
        } else if (!strcasecmp(o->ptr,"allkeys-random")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
        } else if (!strcasecmp(o->ptr,"noeviction")) {
            server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
        } else {
            goto badfmt;
        }
    } else if (!strcasecmp(c->argv[2]->ptr,"maxmemory-samples")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
            ll <= 0) goto badfmt;
        server.maxmemory_samples = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"timeout")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
            ll < 0 || ll > LONG_MAX) goto badfmt;
        server.maxidletime = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"appendfsync")) {
        if (!strcasecmp(o->ptr,"no")) {
            server.appendfsync = APPENDFSYNC_NO;
        } else if (!strcasecmp(o->ptr,"everysec")) {
            server.appendfsync = APPENDFSYNC_EVERYSEC;
        } else if (!strcasecmp(o->ptr,"always")) {
            server.appendfsync = APPENDFSYNC_ALWAYS;
        } else {
            goto badfmt;
        }
    } else if (!strcasecmp(c->argv[2]->ptr,"no-appendfsync-on-rewrite")) {
        int yn = yesnotoi(o->ptr);

        if (yn == -1) goto badfmt;
        server.no_appendfsync_on_rewrite = yn;
    } else if (!strcasecmp(c->argv[2]->ptr,"appendonly")) {
        int old = server.appendonly;
        int new = yesnotoi(o->ptr);

        if (new == -1) goto badfmt;
        if (old != new) {
            if (new == 0) {
                stopAppendOnly();
            } else {
                if (startAppendOnly() == REDIS_ERR) {
                    addReplyError(c,
                        "Unable to turn on AOF. Check server logs.");
                    return;
                }
            }
        }
    } else if (!strcasecmp(c->argv[2]->ptr,"auto-aof-rewrite-percentage")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.auto_aofrewrite_perc = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"auto-aof-rewrite-min-size")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.auto_aofrewrite_min_size = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"save")) {
        int vlen, j;
        sds *v = sdssplitlen(o->ptr,sdslen(o->ptr)," ",1,&vlen);

        /* Perform sanity check before setting the new config:
         * - Even number of args
         * - Seconds >= 1, changes >= 0 */
        if (vlen & 1) {
            sdsfreesplitres(v,vlen);
            goto badfmt;
        }
        for (j = 0; j < vlen; j++) {
            char *eptr;
            long val;

            val = strtoll(v[j], &eptr, 10);
            if (eptr[0] != '\0' ||
                ((j & 1) == 0 && val < 1) ||
                ((j & 1) == 1 && val < 0)) {
                sdsfreesplitres(v,vlen);
                goto badfmt;
            }
        }
        /* Finally set the new config */
        resetServerSaveParams();
        for (j = 0; j < vlen; j += 2) {
            time_t seconds;
            int changes;

            seconds = strtoll(v[j],NULL,10);
            changes = strtoll(v[j+1],NULL,10);
            appendServerSaveParams(seconds, changes);
        }
        sdsfreesplitres(v,vlen);
    } else if (!strcasecmp(c->argv[2]->ptr,"slave-serve-stale-data")) {
        int yn = yesnotoi(o->ptr);

        if (yn == -1) goto badfmt;
        server.repl_serve_stale_data = yn;
    } else if (!strcasecmp(c->argv[2]->ptr,"dir")) {
        if (chdir((char*)o->ptr) == -1) {
            addReplyErrorFormat(c,"Changing directory: %s", strerror(errno));
            return;
        }
    } else if (!strcasecmp(c->argv[2]->ptr,"hash-max-zipmap-entries")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.hash_max_zipmap_entries = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"hash-max-zipmap-value")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.hash_max_zipmap_value = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"list-max-ziplist-entries")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.list_max_ziplist_entries = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"list-max-ziplist-value")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.list_max_ziplist_value = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"set-max-intset-entries")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.set_max_intset_entries = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"zset-max-ziplist-entries")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.zset_max_ziplist_entries = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"zset-max-ziplist-value")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.zset_max_ziplist_value = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"lua-time-limit")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.lua_time_limit = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"slowlog-log-slower-than")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR) goto badfmt;
        server.slowlog_log_slower_than = ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"slowlog-max-len")) {
        if (getLongLongFromObject(o,&ll) == REDIS_ERR || ll < 0) goto badfmt;
        server.slowlog_max_len = (unsigned)ll;
    } else if (!strcasecmp(c->argv[2]->ptr,"loglevel")) {
        if (!strcasecmp(o->ptr,"warning")) {
            server.verbosity = REDIS_WARNING;
        } else if (!strcasecmp(o->ptr,"notice")) {
            server.verbosity = REDIS_NOTICE;
        } else if (!strcasecmp(o->ptr,"verbose")) {
            server.verbosity = REDIS_VERBOSE;
        } else if (!strcasecmp(o->ptr,"debug")) {
            server.verbosity = REDIS_DEBUG;
        } else {
            goto badfmt;
        }
    } else {
        addReplyErrorFormat(c,"Unsupported CONFIG parameter: %s",
            (char*)c->argv[2]->ptr);
        return;
    }
    addReply(c,shared.ok);
    return;

badfmt: /* Bad format errors */
    addReplyErrorFormat(c,"Invalid argument '%s' for CONFIG SET '%s'",
            (char*)o->ptr,
            (char*)c->argv[2]->ptr);
}

void configGetCommand(redisClient *c) {
    robj *o = c->argv[2];
    void *replylen = addDeferredMultiBulkLength(c);
    char *pattern = o->ptr;
    char buf[128];
    int matches = 0;
    redisAssertWithInfo(c,o,o->encoding == REDIS_ENCODING_RAW);

    if (stringmatch(pattern,"dir",0)) {
        char buf[1024];

        if (getcwd(buf,sizeof(buf)) == NULL)
            buf[0] = '\0';

        addReplyBulkCString(c,"dir");
        addReplyBulkCString(c,buf);
        matches++;
    }
    if (stringmatch(pattern,"dbfilename",0)) {
        addReplyBulkCString(c,"dbfilename");
        addReplyBulkCString(c,server.dbfilename);
        matches++;
    }
    if (stringmatch(pattern,"requirepass",0)) {
        addReplyBulkCString(c,"requirepass");
        addReplyBulkCString(c,server.requirepass);
        matches++;
    }
    if (stringmatch(pattern,"masterauth",0)) {
        addReplyBulkCString(c,"masterauth");
        addReplyBulkCString(c,server.masterauth);
        matches++;
    }
    if (stringmatch(pattern,"maxmemory",0)) {
        ll2string(buf,sizeof(buf),server.maxmemory);
        addReplyBulkCString(c,"maxmemory");
        addReplyBulkCString(c,buf);
        matches++;
    }
    if (stringmatch(pattern,"maxmemory-policy",0)) {
        char *s;

        switch(server.maxmemory_policy) {
        case REDIS_MAXMEMORY_VOLATILE_LRU: s = "volatile-lru"; break;
        case REDIS_MAXMEMORY_VOLATILE_TTL: s = "volatile-ttl"; break;
        case REDIS_MAXMEMORY_VOLATILE_RANDOM: s = "volatile-random"; break;
        case REDIS_MAXMEMORY_ALLKEYS_LRU: s = "allkeys-lru"; break;
        case REDIS_MAXMEMORY_ALLKEYS_RANDOM: s = "allkeys-random"; break;
        case REDIS_MAXMEMORY_NO_EVICTION: s = "noeviction"; break;
        default: s = "unknown"; break; /* too harmless to panic */
        }
        addReplyBulkCString(c,"maxmemory-policy");
        addReplyBulkCString(c,s);
        matches++;
    }
    if (stringmatch(pattern,"maxmemory-samples",0)) {
        ll2string(buf,sizeof(buf),server.maxmemory_samples);
        addReplyBulkCString(c,"maxmemory-samples");
        addReplyBulkCString(c,buf);
        matches++;
    }
    if (stringmatch(pattern,"timeout",0)) {
        ll2string(buf,sizeof(buf),server.maxidletime);
        addReplyBulkCString(c,"timeout");
        addReplyBulkCString(c,buf);
        matches++;
    }
    if (stringmatch(pattern,"appendonly",0)) {
        addReplyBulkCString(c,"appendonly");
        addReplyBulkCString(c,server.appendonly ? "yes" : "no");
        matches++;
    }
    if (stringmatch(pattern,"no-appendfsync-on-rewrite",0)) {
        addReplyBulkCString(c,"no-appendfsync-on-rewrite");
        addReplyBulkCString(c,server.no_appendfsync_on_rewrite ? "yes" : "no");
        matches++;
    }
    if (stringmatch(pattern,"appendfsync",0)) {
        char *policy;

        switch(server.appendfsync) {
        case APPENDFSYNC_NO: policy = "no"; break;
        case APPENDFSYNC_EVERYSEC: policy = "everysec"; break;
        case APPENDFSYNC_ALWAYS: policy = "always"; break;
        default: policy = "unknown"; break; /* too harmless to panic */
        }
        addReplyBulkCString(c,"appendfsync");
        addReplyBulkCString(c,policy);
        matches++;
    }
    if (stringmatch(pattern,"save",0)) {
        sds buf = sdsempty();
        int j;

        for (j = 0; j < server.saveparamslen; j++) {
            buf = sdscatprintf(buf,"%ld %d",
                    server.saveparams[j].seconds,
                    server.saveparams[j].changes);
            if (j != server.saveparamslen-1)
                buf = sdscatlen(buf," ",1);
        }
        addReplyBulkCString(c,"save");
        addReplyBulkCString(c,buf);
        sdsfree(buf);
        matches++;
    }
    if (stringmatch(pattern,"auto-aof-rewrite-percentage",0)) {
        addReplyBulkCString(c,"auto-aof-rewrite-percentage");
        addReplyBulkLongLong(c,server.auto_aofrewrite_perc);
        matches++;
    }
    if (stringmatch(pattern,"auto-aof-rewrite-min-size",0)) {
        addReplyBulkCString(c,"auto-aof-rewrite-min-size");
        addReplyBulkLongLong(c,server.auto_aofrewrite_min_size);
        matches++;
    }
    if (stringmatch(pattern,"slave-serve-stale-data",0)) {
        addReplyBulkCString(c,"slave-serve-stale-data");
        addReplyBulkCString(c,server.repl_serve_stale_data ? "yes" : "no");
        matches++;
    }
    if (stringmatch(pattern,"hash-max-zipmap-entries",0)) {
        addReplyBulkCString(c,"hash-max-zipmap-entries");
        addReplyBulkLongLong(c,server.hash_max_zipmap_entries);
        matches++;
    }
    if (stringmatch(pattern,"hash-max-zipmap-value",0)) {
        addReplyBulkCString(c,"hash-max-zipmap-value");
        addReplyBulkLongLong(c,server.hash_max_zipmap_value);
        matches++;
    }
    if (stringmatch(pattern,"list-max-ziplist-entries",0)) {
        addReplyBulkCString(c,"list-max-ziplist-entries");
        addReplyBulkLongLong(c,server.list_max_ziplist_entries);
        matches++;
    }
    if (stringmatch(pattern,"list-max-ziplist-value",0)) {
        addReplyBulkCString(c,"list-max-ziplist-value");
        addReplyBulkLongLong(c,server.list_max_ziplist_value);
        matches++;
    }
    if (stringmatch(pattern,"set-max-intset-entries",0)) {
        addReplyBulkCString(c,"set-max-intset-entries");
        addReplyBulkLongLong(c,server.set_max_intset_entries);
        matches++;
    }
    if (stringmatch(pattern,"zset-max-ziplist-entries",0)) {
        addReplyBulkCString(c,"zset-max-ziplist-entries");
        addReplyBulkLongLong(c,server.zset_max_ziplist_entries);
        matches++;
    }
    if (stringmatch(pattern,"zset-max-ziplist-value",0)) {
        addReplyBulkCString(c,"zset-max-ziplist-value");
        addReplyBulkLongLong(c,server.zset_max_ziplist_value);
        matches++;
    }
    if (stringmatch(pattern,"lua-time-limit",0)) {
        addReplyBulkCString(c,"lua-time-limit");
        addReplyBulkLongLong(c,server.lua_time_limit);
        matches++;
    }
    if (stringmatch(pattern,"slowlog-log-slower-than",0)) {
        addReplyBulkCString(c,"slowlog-log-slower-than");
        addReplyBulkLongLong(c,server.slowlog_log_slower_than);
        matches++;
    }
    if (stringmatch(pattern,"slowlog-max-len",0)) {
        addReplyBulkCString(c,"slowlog-max-len");
        addReplyBulkLongLong(c,server.slowlog_max_len);
        matches++;
    }
    if (stringmatch(pattern,"loglevel",0)) {
        char *s;

        switch(server.verbosity) {
        case REDIS_WARNING: s = "warning"; break;
        case REDIS_VERBOSE: s = "verbose"; break;
        case REDIS_NOTICE: s = "notice"; break;
        case REDIS_DEBUG: s = "debug"; break;
        default: s = "unknown"; break; /* too harmless to panic */
        }
        addReplyBulkCString(c,"loglevel");
        addReplyBulkCString(c,s);
        matches++;
    }
    setDeferredMultiBulkLength(c,replylen,matches*2);
}

void configCommand(redisClient *c) {
    if (!strcasecmp(c->argv[1]->ptr,"set")) {
        if (c->argc != 4) goto badarity;
        configSetCommand(c);
    } else if (!strcasecmp(c->argv[1]->ptr,"get")) {
        if (c->argc != 3) goto badarity;
        configGetCommand(c);
    } else if (!strcasecmp(c->argv[1]->ptr,"resetstat")) {
        if (c->argc != 2) goto badarity;
        server.stat_keyspace_hits = 0;
        server.stat_keyspace_misses = 0;
        server.stat_numcommands = 0;
        server.stat_numconnections = 0;
        server.stat_expiredkeys = 0;
        resetCommandTableStats();
        addReply(c,shared.ok);
    } else {
        addReplyError(c,
            "CONFIG subcommand must be one of GET, SET, RESETSTAT");
    }
    return;

badarity:
    addReplyErrorFormat(c,"Wrong number of arguments for CONFIG %s",
        (char*) c->argv[1]->ptr);
}