Binding multiple IPs done properly with multiple sockets.

src/aof.c

@@ -962,8 +962,7 @@ int rewriteAppendOnlyFileBackground(void) {
         char tmpfile[256];
 
         /* Child */
-        if (server.ipfd > 0) close(server.ipfd);
+        closeListeningSockets(0);
-        if (server.sofd > 0) close(server.sofd);
         redisSetProcTitle("redis-aof-rewrite");
         snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) getpid());
         if (rewriteAppendOnlyFile(tmpfile) == REDIS_OK) {

src/cluster.c

@@ -224,7 +224,7 @@ void clusterSaveConfigOrDie(void) {
 }
 
 void clusterInit(void) {
-    int saveconf = 0;
+    int saveconf = 0, j;
 
     server.cluster = zmalloc(sizeof(clusterState));
     server.cluster->myself = NULL;
@@ -251,14 +251,24 @@ void clusterInit(void) {
     }
     if (saveconf) clusterSaveConfigOrDie();
     /* We need a listening TCP port for our cluster messaging needs */
-    server.cfd = anetTcpServer(server.neterr,
+    server.cfd_count = 0;
-            server.port+REDIS_CLUSTER_PORT_INCR, server.bindaddr);
+    if (server.bindaddr_count == 0) server.bindaddr[0] = NULL;
-    if (server.cfd == -1) {
+    for (j = 0; j < server.bindaddr_count || j == 0; j++) {
-        redisLog(REDIS_WARNING, "Opening cluster TCP port: %s", server.neterr);
+        server.cfd[j] = anetTcpServer(
+            server.neterr, server.port+REDIS_CLUSTER_PORT_INCR,
+            server.bindaddr[j]);
+        if (server.cfd[j] == -1) {
+            redisLog(REDIS_WARNING,
+                "Opening cluster listening TCP socket %s:%d: %s",
+                    server.bindaddr[j] ? server.bindaddr[j] : "*",
+                    server.port+REDIS_CLUSTER_PORT_INCR,
+                    server.neterr);
             exit(1);
         }
-    if (aeCreateFileEvent(server.el, server.cfd, AE_READABLE,
+        if (aeCreateFileEvent(server.el, server.cfd[j], AE_READABLE,
             clusterAcceptHandler, NULL) == AE_ERR) redisPanic("Unrecoverable error creating Redis Cluster file event.");
+        server.cfd_count++;
+    }
     server.cluster->slots_to_keys = zslCreate();
 }
 

src/rdb.c

@@ -729,8 +729,7 @@ int rdbSaveBackground(char *filename) {
         int retval;
 
         /* Child */
-        if (server.ipfd > 0) close(server.ipfd);
+        closeListeningSockets(0);
-        if (server.sofd > 0) close(server.sofd);
         redisSetProcTitle("redis-rdb-bgsave");
         retval = rdbSave(filename);
         if (retval == REDIS_OK) {

src/redis.c

@@ -1224,7 +1224,7 @@ void initServerConfig() {
     server.bindaddr_count = 0;
     server.unixsocket = NULL;
     server.unixsocketperm = REDIS_DEFAULT_UNIX_SOCKET_PERM;
-    server.ipfd = -1;
+    server.ipfd_count = 0;
     server.sofd = -1;
     server.dbnum = REDIS_DEFAULT_DBNUM;
     server.verbosity = REDIS_DEFAULT_VERBOSITY;
@@ -1425,14 +1425,25 @@ void initServer() {
     server.el = aeCreateEventLoop(server.maxclients+REDIS_EVENTLOOP_FDSET_INCR);
     server.db = zmalloc(sizeof(redisDb)*server.dbnum);
 
+    /* Open the TCP listening sockets. */
     if (server.port != 0) {
-        server.ipfd = anetTcpServer(server.neterr,server.port,server.bindaddr,server.bindaddr_count);
+        /* Force binding of 0.0.0.0 if no bind address is specified, always
-        if (server.ipfd == ANET_ERR) {
+         * entering the loop if j == 0. */
-            redisLog(REDIS_WARNING, "Opening port %d: %s",
+        if (server.bindaddr_count == 0) server.bindaddr[0] = NULL;
+        for (j = 0; j < server.bindaddr_count || j == 0; j++) {
+            server.ipfd[server.ipfd_count] = anetTcpServer(server.neterr,server.port,server.bindaddr[j]);
+            if (server.ipfd[server.ipfd_count] == ANET_ERR) {
+                redisLog(REDIS_WARNING,
+                    "Creating Server TCP listening socket %s:%d: %s",
+                    server.bindaddr[j] ? server.bindaddr[j] : "*",
                     server.port, server.neterr);
                 exit(1);
             }
+            server.ipfd_count++;
         }
+    }
+
+    /* Open the listening Unix domain socket. */
     if (server.unixsocket != NULL) {
         unlink(server.unixsocket); /* don't care if this fails */
         server.sofd = anetUnixServer(server.neterr,server.unixsocket,server.unixsocketperm);
@@ -1441,10 +1452,14 @@ void initServer() {
             exit(1);
         }
     }
-    if (server.ipfd < 0 && server.sofd < 0) {
+
+    /* Abort if there are no listening sockets at all. */
+    if (server.ipfd_count == 0 && server.sofd < 0) {
         redisLog(REDIS_WARNING, "Configured to not listen anywhere, exiting.");
         exit(1);
     }
+
+    /* Create the Redis databases, and initialize other internal state. */
     for (j = 0; j < server.dbnum; j++) {
         server.db[j].dict = dictCreate(&dbDictType,NULL);
         server.db[j].expires = dictCreate(&keyptrDictType,NULL);
@@ -1487,15 +1502,28 @@ void initServer() {
     server.unixtime = time(NULL);
     server.lastbgsave_status = REDIS_OK;
     server.repl_good_slaves_count = 0;
+
+    /* Create the serverCron() time event, that's our main way to process
+     * background operations. */
     if(aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL) == AE_ERR) {
         redisPanic("Can't create the serverCron time event.");
         exit(1);
     }
-    if (server.ipfd > 0 && aeCreateFileEvent(server.el,server.ipfd,AE_READABLE,
+
-        acceptTcpHandler,NULL) == AE_ERR) redisPanic("Unrecoverable error creating server.ipfd file event.");
+    /* Create an event handler for accepting new connections in TCP and Unix
+     * domain sockets. */
+    for (j = 0; j < server.ipfd_count; j++) {
+        if (aeCreateFileEvent(server.el, server.ipfd[j], AE_READABLE,
+            acceptTcpHandler,NULL) == AE_ERR)
+            {
+                redisPanic(
+                    "Unrecoverable error creating server.ipfd file event.");
+            }
+    }
     if (server.sofd > 0 && aeCreateFileEvent(server.el,server.sofd,AE_READABLE,
         acceptUnixHandler,NULL) == AE_ERR) redisPanic("Unrecoverable error creating server.sofd file event.");
 
+    /* Open the AOF file if needed. */
     if (server.aof_state == REDIS_AOF_ON) {
         server.aof_fd = open(server.aof_filename,
                                O_WRONLY|O_APPEND|O_CREAT,0644);
@@ -1930,6 +1958,21 @@ int processCommand(redisClient *c) {
 
 /*================================== Shutdown =============================== */
 
+/* Close listening sockets. Also unlink the unix domain socket if
+ * unlink_unix_socket is non-zero. */
+void closeListeningSockets(int unlink_unix_socket) {
+    int j;
+
+    for (j = 0; j < server.ipfd_count; j++) close(server.ipfd[j]);
+    if (server.sofd != -1) close(server.sofd);
+    if (server.cluster_enabled)
+        for (j = 0; j < server.cfd_count; j++) close(server.cfd[j]);
+    if (unlink_unix_socket && server.unixsocket) {
+        redisLog(REDIS_NOTICE,"Removing the unix socket file.");
+        unlink(server.unixsocket); /* don't care if this fails */
+    }
+}
+
 int prepareForShutdown(int flags) {
     int save = flags & REDIS_SHUTDOWN_SAVE;
     int nosave = flags & REDIS_SHUTDOWN_NOSAVE;
@@ -1973,13 +2016,7 @@ int prepareForShutdown(int flags) {
         unlink(server.pidfile);
     }
     /* Close the listening sockets. Apparently this allows faster restarts. */
-    if (server.ipfd != -1) close(server.ipfd);
+    closeListeningSockets(1);
-    if (server.sofd != -1) close(server.sofd);
-    if (server.unixsocket) {
-        redisLog(REDIS_NOTICE,"Removing the unix socket file.");
-        unlink(server.unixsocket); /* don't care if this fails */
-    }
-
     redisLog(REDIS_WARNING,"Redis is now ready to exit, bye bye...");
     return REDIS_OK;
 }
@@ -2936,7 +2973,7 @@ int main(int argc, char **argv) {
                 exit(1);
             }
         }
-        if (server.ipfd > 0)
+        if (server.ipfd_count > 0)
             redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
         if (server.sofd > 0)
             redisLog(REDIS_NOTICE,"The server is now ready to accept connections at %s", server.unixsocket);

src/redis.h

@@ -735,9 +735,11 @@ struct redisServer {
     int bindaddr_count;         /* Number of addresses in server.bindaddr[] */
     char *unixsocket;           /* UNIX socket path */
     mode_t unixsocketperm;      /* UNIX socket permission */
-    int ipfd;                   /* TCP socket file descriptor */
+    int ipfd[REDIS_BINDADDR_MAX]; /* TCP socket file descriptors */
+    int ipfd_count;             /* Used slots in ipfd[] */
     int sofd;                   /* Unix socket file descriptor */
-    int cfd;                    /* Cluster bus listening socket */
+    int cfd[REDIS_BINDADDR_MAX];/* Cluster bus listening socket */
+    int cfd_count;              /* Used slots in cfd[] */
     list *clients;              /* List of active clients */
     list *clients_to_close;     /* Clients to close asynchronously */
     list *slaves, *monitors;    /* List of slaves and MONITORs */
@@ -1246,6 +1248,7 @@ void oom(const char *msg);
 void populateCommandTable(void);
 void resetCommandTableStats(void);
 void adjustOpenFilesLimit(void);
+void closeListeningSockets(int unlink_unix_socket);
 
 /* Set data type */
 robj *setTypeCreate(robj *value);