Revert "Network and IPv{4,6} related changes"

19 files changed, 241 insertions, 88 deletions

diff --git a/docs/help/in/toggle.in b/docs/help/in/toggle.in
index 71f5c8f4..f87a6462 100644
--- a/docs/help/in/toggle.in
+++ b/docs/help/in/toggle.in
@@ -15,7 +15,7 @@
 
 %9Examples:%9
 
-    /TOGGLE resolve_reverse_lookup
+    /TOGGLE resolve_prefer_ipv6
     /TOGGLE channels_rejoin_unavailable ON
 
 %9See also:%9 SET
diff --git a/docs/manual.txt b/docs/manual.txt
index 12d8031e..b2d0de14 100644
--- a/docs/manual.txt
+++ b/docs/manual.txt
@@ -429,6 +429,9 @@
 	After connected to server, Irssi can automatically change your user
 	mode. You can set it with /SET usermode <mode>, default is +i.
 
+	/SET resolve_prefer_ipv6 - If ON, prefer IPv6 for hosts that
+	     have both v4 and v6 addresses.
+
  5.5 Automatic reconnecting
 
 	If you get disconnected from server, Irssi will try to reconnect
diff --git a/src/core/chat-commands.c b/src/core/chat-commands.c
index 9c28a1fc..8e881679 100644
--- a/src/core/chat-commands.c
+++ b/src/core/chat-commands.c
@@ -128,10 +128,10 @@ static SERVER_CONNECT_REC *get_server_connect(const char *data, int *plus_addr,
 
         host = g_hash_table_lookup(optlist, "host");
 	if (host != NULL && *host != '\0') {
-		IPADDR ip;
+		IPADDR ip4, ip6;
 
-		if (net_gethostbyname(host, &ip) == 0)
-                        server_connect_own_ip_save(conn, &ip);
+		if (net_gethostbyname(host, &ip4, &ip6) == 0)
+                        server_connect_own_ip_save(conn, &ip4, &ip6);
 	}
 
 	cmd_params_free(free_arg);
diff --git a/src/core/chatnet-rec.h b/src/core/chatnet-rec.h
index 3044643a..e3ed8aa0 100644
--- a/src/core/chatnet-rec.h
+++ b/src/core/chatnet-rec.h
@@ -9,4 +9,4 @@ char *realname;
 
 char *own_host; /* address to use when connecting this server */
 char *autosendcmd; /* command to send after connecting to this ircnet */
-IPADDR *own_ip; /* resolved own_address if not NULL */
+IPADDR *own_ip4, *own_ip6; /* resolved own_address if not NULL */
diff --git a/src/core/net-nonblock.c b/src/core/net-nonblock.c
index bc8c4b96..e637e673 100644
--- a/src/core/net-nonblock.c
+++ b/src/core/net-nonblock.c
@@ -103,12 +103,15 @@ int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
 	srand(time(NULL));
 
         memset(&rec, 0, sizeof(rec));
-	rec.error = net_gethostbyname(addr, &rec.ip);
+	rec.error = net_gethostbyname(addr, &rec.ip4, &rec.ip6);
 	if (rec.error == 0) {
 		errorstr = NULL;
 		if (reverse_lookup) {
 			/* reverse lookup the IP, ignore any error */
-			net_gethostbyaddr(&rec.ip, &rec.host);
+			if (rec.ip4.family != 0)
+				net_gethostbyaddr(&rec.ip4, &rec.host4);
+			if (rec.ip6.family != 0)
+				net_gethostbyaddr(&rec.ip6, &rec.host6);
 		}
 	} else {
 		errorstr = net_gethosterror(rec.error);
@@ -119,11 +122,18 @@ int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe,
 	if (rec.errlen != 0)
 		g_io_channel_write_block(pipe, (void *) errorstr, rec.errlen);
 	else {
-		if (rec.host) {
-			len = strlen(rec.host) + 1;
+		if (rec.host4) {
+			len = strlen(rec.host4) + 1;
 			g_io_channel_write_block(pipe, (void *) &len,
 						       sizeof(int));
-			g_io_channel_write_block(pipe, (void *) rec.host,
+			g_io_channel_write_block(pipe, (void *) rec.host4,
+						       len);
+		}
+		if (rec.host6) {
+			len = strlen(rec.host6) + 1;
+			g_io_channel_write_block(pipe, (void *) &len,
+						       sizeof(int));
+			g_io_channel_write_block(pipe, (void *) rec.host6,
 						       len);
 		}
 	}
@@ -144,7 +154,8 @@ int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec)
 
 	rec->error = -1;
 	rec->errorstr = NULL;
-	rec->host = NULL;
+	rec->host4 = NULL;
+	rec->host6 = NULL;
 
 #ifndef WIN32
 	fcntl(g_io_channel_unix_get_fd(pipe), F_SETFL, O_NONBLOCK);
@@ -163,10 +174,15 @@ int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec)
 		rec->errorstr = g_malloc0(rec->errlen+1);
                 g_io_channel_read_block(pipe, rec->errorstr, rec->errlen);
 	} else {
-		if (rec->host) {
+		if (rec->host4) {
+			g_io_channel_read_block(pipe, &len, sizeof(int));
+			rec->host4 = g_malloc0(len);
+			g_io_channel_read_block(pipe, rec->host4, len);
+		}
+		if (rec->host6) {
 			g_io_channel_read_block(pipe, &len, sizeof(int));
-			rec->host = g_malloc0(len);
-			g_io_channel_read_block(pipe, rec->host, len);
+			rec->host6 = g_malloc0(len);
+			g_io_channel_read_block(pipe, rec->host6, len);
 		}
 	}
 
@@ -211,6 +227,7 @@ static void simple_readpipe(SIMPLE_THREAD_REC *rec, GIOChannel *pipe)
 {
 	RESOLVED_IP_REC iprec;
 	GIOChannel *handle;
+	IPADDR *ip;
 
 	g_return_if_fail(rec != NULL);
 
@@ -224,8 +241,9 @@ static void simple_readpipe(SIMPLE_THREAD_REC *rec, GIOChannel *pipe)
 	g_io_channel_shutdown(rec->pipes[1], TRUE, NULL);
 	g_io_channel_unref(rec->pipes[1]);
 
+	ip = iprec.ip4.family != 0 ? &iprec.ip4 : &iprec.ip6;
 	handle = iprec.error == -1 ? NULL :
-		net_connect_ip(&iprec.ip, rec->port, rec->my_ip);
+		net_connect_ip(ip, rec->port, rec->my_ip);
 
 	g_free_not_null(rec->my_ip);
 
diff --git a/src/core/net-nonblock.h b/src/core/net-nonblock.h
index 581536b3..af5968c8 100644
--- a/src/core/net-nonblock.h
+++ b/src/core/net-nonblock.h
@@ -4,12 +4,12 @@
 #include "network.h"
 
 typedef struct {
-	IPADDR ip; /* resolved ip address */
+	IPADDR ip4, ip6; /* resolved ip addresses */
 	int error; /* error, 0 = no error, -1 = error: */
 	int errlen; /* error text length */
 	char *errorstr; /* error string - dynamically allocated, you'll
 	                   need to free() it yourself unless it's NULL */
-	char *host; /* dito */
+	char *host4, *host6; /* dito */
 } RESOLVED_IP_REC;
 
 typedef struct {
diff --git a/src/core/network.c b/src/core/network.c
index 303483c6..bfaa47fb 100644
--- a/src/core/network.c
+++ b/src/core/network.c
@@ -137,14 +137,35 @@ static int sin_get_port(union sockaddr_union *so)
 /* Connect to socket */
 GIOChannel *net_connect(const char *addr, int port, IPADDR *my_ip)
 {
-	IPADDR ip;
+	IPADDR ip4, ip6, *ip;
 
 	g_return_val_if_fail(addr != NULL, NULL);
 
-	if (net_gethostbyname(addr, &ip) == -1)
+	if (net_gethostbyname(addr, &ip4, &ip6) == -1)
 		return NULL;
 
-	return net_connect_ip(&ip, port, my_ip);
+	if (my_ip == NULL) {
+                /* prefer IPv4 addresses */
+		ip = ip4.family != 0 ? &ip4 : &ip6;
+	} else if (IPADDR_IS_V6(my_ip)) {
+                /* my_ip is IPv6 address, use it if possible */
+		if (ip6.family != 0)
+			ip = &ip6;
+		else {
+			my_ip = NULL;
+                        ip = &ip4;
+		}
+	} else {
+                /* my_ip is IPv4 address, use it if possible */
+		if (ip4.family != 0)
+			ip = &ip4;
+		else {
+			my_ip = NULL;
+                        ip = &ip6;
+		}
+	}
+
+	return net_connect_ip(ip, port, my_ip);
 }
 
 /* Connect to socket with ip address */
@@ -392,35 +413,82 @@ int net_getsockname(GIOChannel *handle, IPADDR *addr, int *port)
 /* Get IP addresses for host, both IPv4 and IPv6 if possible.
    If ip->family is 0, the address wasn't found.
    Returns 0 = ok, others = error code for net_gethosterror() */
-int net_gethostbyname(const char *addr, IPADDR *ip)
+int net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6)
 {
+#ifdef HAVE_IPV6
 	union sockaddr_union *so;
-	struct addrinfo hints, *ailist;
-	int ret;
+	struct addrinfo hints, *ai, *ailist;
+	int ret, count_v4, count_v6, use_v4, use_v6;
+#else
+	struct hostent *hp;
+	int count;
+#endif
 
 	g_return_val_if_fail(addr != NULL, -1);
 
-	memset(ip, 0, sizeof(IPADDR));
+	memset(ip4, 0, sizeof(IPADDR));
+	memset(ip6, 0, sizeof(IPADDR));
 
+#ifdef HAVE_IPV6
 	memset(&hints, 0, sizeof(struct addrinfo));
 	hints.ai_socktype = SOCK_STREAM;
-#ifdef HAVE_IPV6
-	hints.ai_family = AF_UNSPEC;
-#else
-	hints.ai_family = AF_INET;
-#endif
-	hints.ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG);
 
 	/* save error to host_error for later use */
 	ret = getaddrinfo(addr, NULL, &hints, &ailist);
 	if (ret != 0)
 		return ret;
 
-	so = (const union sockaddr_union *)ailist->ai_addr;
-	sin_get_ip(so, ip);
+	/* count IPs */
+        count_v4 = count_v6 = 0;
+	for (ai = ailist; ai != NULL; ai = ai->ai_next) {
+		if (ai->ai_family == AF_INET)
+			count_v4++;
+		else if (ai->ai_family == AF_INET6)
+			count_v6++;
+	}
+
+	if (count_v4 == 0 && count_v6 == 0)
+		return HOST_NOT_FOUND; /* shouldn't happen? */
+
+	/* if there are multiple addresses, return random one */
+	use_v4 = count_v4 <= 1 ? 0 : rand() % count_v4;
+	use_v6 = count_v6 <= 1 ? 0 : rand() % count_v6;
+
+	count_v4 = count_v6 = 0;
+	for (ai = ailist; ai != NULL; ai = ai->ai_next) {
+		so = (union sockaddr_union *) ai->ai_addr;
+
+		if (ai->ai_family == AF_INET) {
+			if (use_v4 == count_v4)
+				sin_get_ip(so, ip4);
+                        count_v4++;
+		} else if (ai->ai_family == AF_INET6) {
+			if (use_v6 == count_v6)
+				sin_get_ip(so, ip6);
+			count_v6++;
+		}
+	}
 	freeaddrinfo(ailist);
+	return 0;
+#else
+	hp = gethostbyname(addr);
+	if (hp == NULL)
+		return h_errno;
+
+	/* count IPs */
+	count = 0;
+	while (hp->h_addr_list[count] != NULL)
+		count++;
+
+	if (count == 0)
+		return HOST_NOT_FOUND; /* shouldn't happen? */
+
+	/* if there are multiple addresses, return random one */
+	ip4->family = AF_INET;
+	memcpy(&ip4->ip, hp->h_addr_list[rand() % count], 4);
 
 	return 0;
+#endif
 }
 
 /* Get name for host, *name should be g_free()'d unless it's NULL.
diff --git a/src/core/network.h b/src/core/network.h
index ea8b3055..fa7e9675 100644
--- a/src/core/network.h
+++ b/src/core/network.h
@@ -71,7 +71,7 @@ int net_transmit(GIOChannel *handle, const char *data, int len);
 /* Get IP addresses for host, both IPv4 and IPv6 if possible.
    If ip->family is 0, the address wasn't found.
    Returns 0 = ok, others = error code for net_gethosterror() */
-int net_gethostbyname(const char *addr, IPADDR *ip);
+int net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6);
 /* Get name for host, *name should be g_free()'d unless it's NULL.
    Return values are the same as with net_gethostbyname() */
 int net_gethostbyaddr(IPADDR *ip, char **name);
diff --git a/src/core/server-connect-rec.h b/src/core/server-connect-rec.h
index 3f24e7d8..80c5761b 100644
--- a/src/core/server-connect-rec.h
+++ b/src/core/server-connect-rec.h
@@ -16,7 +16,7 @@ char *address;
 int port;
 char *chatnet;
 
-IPADDR *own_ip;
+IPADDR *own_ip4, *own_ip6;
 
 char *password;
 char *nick;
diff --git a/src/core/server-setup-rec.h b/src/core/server-setup-rec.h
index fbf49b2c..2c9614c7 100644
--- a/src/core/server-setup-rec.h
+++ b/src/core/server-setup-rec.h
@@ -19,7 +19,7 @@ char *ssl_capath;
 char *ssl_ciphers;
 
 char *own_host; /* address to use when connecting this server */
-IPADDR *own_ip; /* resolved own_address if not NULL */
+IPADDR *own_ip4, *own_ip6; /* resolved own_address if not NULL */
 
 time_t last_connect; /* to avoid reconnecting too fast.. */
 
diff --git a/src/core/servers-reconnect.c b/src/core/servers-reconnect.c
index 3ba18ad0..ae97ecd2 100644
--- a/src/core/servers-reconnect.c
+++ b/src/core/servers-reconnect.c
@@ -177,9 +177,13 @@ server_connect_copy_skeleton(SERVER_CONNECT_REC *src, int connect_info)
 	dest->username = g_strdup(src->username);
 	dest->realname = g_strdup(src->realname);
 
-	if (src->own_ip != NULL) {
-		dest->own_ip = g_new(IPADDR, 1);
-		memcpy(dest->own_ip, src->own_ip, sizeof(IPADDR));
+	if (src->own_ip4 != NULL) {
+		dest->own_ip4 = g_new(IPADDR, 1);
+		memcpy(dest->own_ip4, src->own_ip4, sizeof(IPADDR));
+	}
+	if (src->own_ip6 != NULL) {
+		dest->own_ip6 = g_new(IPADDR, 1);
+		memcpy(dest->own_ip6, src->own_ip6, sizeof(IPADDR));
 	}
 
 	dest->channels = g_strdup(src->channels);
diff --git a/src/core/servers-setup.c b/src/core/servers-setup.c
index e8506f0f..90a447d4 100644
--- a/src/core/servers-setup.c
+++ b/src/core/servers-setup.c
@@ -33,22 +33,32 @@ GSList *setupservers;
 
 static char *old_source_host;
 int source_host_ok; /* Use source_host_ip .. */
-IPADDR source_host_ip; /* Resolved address */
+IPADDR *source_host_ip4, *source_host_ip6; /* Resolved address */
 
-static void save_ips(IPADDR *ip, IPADDR **save_ip)
+static void save_ips(IPADDR *ip4, IPADDR *ip6,
+		     IPADDR **save_ip4, IPADDR **save_ip6)
 {
-	if (ip->family == 0)
-		g_free_and_null(*save_ip);
+	if (ip4->family == 0)
+		g_free_and_null(*save_ip4);
 	else {
-                if (*save_ip == NULL)
-			*save_ip = g_new(IPADDR, 1);
-		memcpy(*save_ip, ip, sizeof(IPADDR));
+                if (*save_ip4 == NULL)
+			*save_ip4 = g_new(IPADDR, 1);
+		memcpy(*save_ip4, ip4, sizeof(IPADDR));
+	}
+
+	if (ip6->family == 0)
+		g_free_and_null(*save_ip6);
+	else {
+                if (*save_ip6 == NULL)
+			*save_ip6 = g_new(IPADDR, 1);
+		memcpy(*save_ip6, ip6, sizeof(IPADDR));
 	}
 }
 
 static void get_source_host_ip(void)
 {
         const char *hostname;
+	IPADDR ip4, ip6;
 
 	if (source_host_ok)
 		return;
@@ -56,21 +66,28 @@ static void get_source_host_ip(void)
 	/* FIXME: This will block! */
         hostname = settings_get_str("hostname");
 	source_host_ok = *hostname != '\0' &&
-		net_gethostbyname(hostname, &source_host_ip) == 0;
+		net_gethostbyname(hostname, &ip4, &ip6) == 0;
+
+	if (source_host_ok)
+		save_ips(&ip4, &ip6, &source_host_ip4, &source_host_ip6);
+	else {
+                g_free_and_null(source_host_ip4);
+                g_free_and_null(source_host_ip6);
+	}
 }
 
 static void conn_set_ip(SERVER_CONNECT_REC *conn, const char *own_host,
-			IPADDR **own_ip)
+			IPADDR **own_ip4, IPADDR **own_ip6)
 {
-	IPADDR ip;
+	IPADDR ip4, ip6;
 
-	if (*own_ip == NULL) {
+	if (*own_ip4 == NULL && *own_ip6 == NULL) {
 		/* resolve the IP */
-		if (net_gethostbyname(own_host, &ip) == 0)
-                        save_ips(&ip, own_ip);
+		if (net_gethostbyname(own_host, &ip4, &ip6) == 0)
+                        save_ips(&ip4, &ip6, own_ip4, own_ip6);
 	}
 
-	server_connect_own_ip_save(conn, *own_ip);
+	server_connect_own_ip_save(conn, *own_ip4, *own_ip6);
 }
 
 /* Fill information to connection from server setup record */
@@ -81,7 +98,8 @@ void server_setup_fill_reconn(SERVER_CONNECT_REC *conn,
 	g_return_if_fail(IS_SERVER_SETUP(sserver));
 
 	if (sserver->own_host != NULL) {
-		conn_set_ip(conn, sserver->own_host, &sserver->own_ip);
+		conn_set_ip(conn, sserver->own_host,
+			    &sserver->own_ip4, &sserver->own_ip6);
 	}
 
 	if (sserver->chatnet != NULL && conn->chatnet == NULL)
@@ -121,9 +139,13 @@ static void server_setup_fill(SERVER_CONNECT_REC *conn,
 	}
 
 	/* source IP */
-	if (source_host_ok) {
-		conn->own_ip = g_new(IPADDR, 1);
-		memcpy(conn->own_ip, &source_host_ip, sizeof(IPADDR));
+	if (source_host_ip4 != NULL) {
+		conn->own_ip4 = g_new(IPADDR, 1);
+		memcpy(conn->own_ip4, source_host_ip4, sizeof(IPADDR));
+	}
+	if (source_host_ip6 != NULL) {
+		conn->own_ip6 = g_new(IPADDR, 1);
+		memcpy(conn->own_ip6, source_host_ip6, sizeof(IPADDR));
 	}
 
 	signal_emit("server setup fill connect", 1, conn);
@@ -184,7 +206,8 @@ static void server_setup_fill_chatnet(SERVER_CONNECT_REC *conn,
 		conn->realname = g_strdup(chatnet->realname);;
 	}
 	if (chatnet->own_host != NULL) {
-		conn_set_ip(conn, chatnet->own_host, &chatnet->own_ip);
+		conn_set_ip(conn, chatnet->own_host,
+			    &chatnet->own_ip4, &chatnet->own_ip6);
 	}
 
 	signal_emit("server setup fill chatnet", 2, conn, chatnet);
@@ -458,7 +481,8 @@ static void server_setup_destroy(SERVER_SETUP_REC *rec)
 	signal_emit("server setup destroyed", 1, rec);
 
 	g_free_not_null(rec->own_host);
-	g_free_not_null(rec->own_ip);
+	g_free_not_null(rec->own_ip4);
+	g_free_not_null(rec->own_ip6);
 	g_free_not_null(rec->chatnet);
 	g_free_not_null(rec->password);
 	g_free_not_null(rec->ssl_cert);
@@ -532,6 +556,7 @@ void servers_setup_init(void)
 	settings_add_str("proxy", "proxy_password", "");
 
         setupservers = NULL;
+	source_host_ip4 = source_host_ip6 = NULL;
         old_source_host = NULL;
 	read_settings();
 
@@ -542,6 +567,8 @@ void servers_setup_init(void)
 
 void servers_setup_deinit(void)
 {
+	g_free_not_null(source_host_ip4);
+	g_free_not_null(source_host_ip6);
 	g_free_not_null(old_source_host);
 
 	while (setupservers != NULL)
diff --git a/src/core/servers-setup.h b/src/core/servers-setup.h
index c4878094..f7601a68 100644
--- a/src/core/servers-setup.h
+++ b/src/core/servers-setup.h
@@ -16,7 +16,7 @@ struct _SERVER_SETUP_REC {
 
 extern GSList *setupservers;
 
-extern IPADDR source_host_ip; /* Resolved address */
+extern IPADDR *source_host_ip4, *source_host_ip6; /* Resolved address */
 extern int source_host_ok; /* Use source_host_ip .. */
 
 /* Fill reconnection specific information to connection
diff --git a/src/core/servers.c b/src/core/servers.c
index 66060a7f..3342304e 100644
--- a/src/core/servers.c
+++ b/src/core/servers.c
@@ -218,7 +218,7 @@ static void server_real_connect(SERVER_REC *server, IPADDR *ip,
 		return;
 
 	if (ip != NULL) {
-		own_ip = server->connrec->own_ip;
+		own_ip = IPADDR_IS_V6(ip) ? server->connrec->own_ip6 : server->connrec->own_ip4;
 		port = server->connrec->proxy != NULL ?
 			server->connrec->proxy_port : server->connrec->port;
 		handle = server->connrec->use_ssl ?
@@ -280,15 +280,30 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
 	server->connect_pipe[0] = NULL;
 	server->connect_pipe[1] = NULL;
 
-	ip = NULL;
-
-	if (iprec.error == 0) {
-	    // FIXME : REMOVE THIS BEFORE MERGE
-	    if (server->connrec->family)
-		g_assert(server->connrec->family == iprec.ip.family);
-
-	    ip = &iprec.ip;
-	    servername = iprec.host;
+	/* figure out if we should use IPv4 or v6 address */
+	if (iprec.error != 0) {
+                /* error */
+		ip = NULL;
+	} else if (server->connrec->family == AF_INET) {
+		/* force IPv4 connection */
+		ip = iprec.ip4.family == 0 ? NULL : &iprec.ip4;
+		servername = iprec.host4;
+	} else if (server->connrec->family == AF_INET6) {
+		/* force IPv6 connection */
+		ip = iprec.ip6.family == 0 ? NULL : &iprec.ip6;
+		servername = iprec.host6;
+	} else {
+		/* pick the one that was found, or if both do it like
+		   /SET resolve_prefer_ipv6 says. */
+		if (iprec.ip4.family == 0 ||
+		    (iprec.ip6.family != 0 &&
+		     settings_get_bool("resolve_prefer_ipv6"))) {
+			ip = &iprec.ip6;
+			servername = iprec.host6;
+		} else {
+			ip = &iprec.ip4;
+			servername = iprec.host4;
+		}
 	}
 
 	if (ip != NULL) {
@@ -322,7 +337,8 @@ static void server_connect_callback_readpipe(SERVER_REC *server)
 	}
 
 	g_free(iprec.errorstr);
-	g_free(iprec.host);
+	g_free(iprec.host4);
+	g_free(iprec.host6);
 }
 
 SERVER_REC *server_connect(SERVER_CONNECT_REC *conn)
@@ -607,7 +623,8 @@ void server_connect_unref(SERVER_CONNECT_REC *conn)
 	g_free_not_null(conn->address);
 	g_free_not_null(conn->chatnet);
 
-	g_free_not_null(conn->own_ip);
+	g_free_not_null(conn->own_ip4);
+	g_free_not_null(conn->own_ip6);
 
         g_free_not_null(conn->password);
         g_free_not_null(conn->nick);
@@ -637,15 +654,26 @@ void server_change_nick(SERVER_REC *server, const char *nick)
 }
 
 /* Update own IPv4 and IPv6 records */
-void server_connect_own_ip_save(SERVER_CONNECT_REC *conn, IPADDR *ip)
+void server_connect_own_ip_save(SERVER_CONNECT_REC *conn,
+				IPADDR *ip4, IPADDR *ip6)
 {
-	if (ip == NULL || ip->family == 0)
-		g_free_and_null(conn->own_ip);
+	if (ip4 == NULL || ip4->family == 0)
+		g_free_and_null(conn->own_ip4);
+	if (ip6 == NULL || ip6->family == 0)
+		g_free_and_null(conn->own_ip6);
+
+	if (ip4 != NULL && ip4->family != 0) {
+		/* IPv4 address was found */
+		if (conn->own_ip4 == NULL)
+			conn->own_ip4 = g_new0(IPADDR, 1);
+		memcpy(conn->own_ip4, ip4, sizeof(IPADDR));
+	}
 
-	if (ip != NULL && ip->family != 0) {
-		if (conn->own_ip == NULL)
-			conn->own_ip = g_new0(IPADDR, 1);
-		memcpy(conn->own_ip, ip, sizeof(IPADDR));
+	if (ip6 != NULL && ip6->family != 0) {
+		/* IPv6 address was found */
+		if (conn->own_ip6 == NULL)
+			conn->own_ip6 = g_new0(IPADDR, 1);
+		memcpy(conn->own_ip6, ip6, sizeof(IPADDR));
 	}
 }
 
@@ -710,6 +738,7 @@ static void sig_chat_protocol_deinit(CHAT_PROTOCOL_REC *proto)
 
 void servers_init(void)
 {
+	settings_add_bool("server", "resolve_prefer_ipv6", FALSE);
 	settings_add_bool("server", "resolve_reverse_lookup", FALSE);
 	lookup_servers = servers = NULL;
 
diff --git a/src/core/servers.h b/src/core/servers.h
index 314faa32..f39c650b 100644
--- a/src/core/servers.h
+++ b/src/core/servers.h
@@ -67,7 +67,8 @@ void server_connect_failed(SERVER_REC *server, const char *msg);
 void server_change_nick(SERVER_REC *server, const char *nick);
 
 /* Update own IPv4 and IPv6 records */
-void server_connect_own_ip_save(SERVER_CONNECT_REC *conn, IPADDR *ip);
+void server_connect_own_ip_save(SERVER_CONNECT_REC *conn,
+				IPADDR *ip4, IPADDR *ip6);
 
 /* `optlist' should contain only one unknown key - the server tag.
    returns NULL if there was unknown -option */
diff --git a/src/fe-common/core/fe-server.c b/src/fe-common/core/fe-server.c
index f8558ad1..429e6dac 100644
--- a/src/fe-common/core/fe-server.c
+++ b/src/fe-common/core/fe-server.c
@@ -138,7 +138,7 @@ static void cmd_server_add(const char *data)
 		if (*password != '\0') g_free_and_null(rec->password);
 		if (g_hash_table_lookup(optlist, "host")) {
 			g_free_and_null(rec->own_host);
-			rec->own_ip = NULL;
+			rec->own_ip4 = rec->own_ip6 = NULL;
 		}
 	}
 
@@ -193,7 +193,7 @@ static void cmd_server_add(const char *data)
 	value = g_hash_table_lookup(optlist, "host");
 	if (value != NULL && *value != '\0') {
 		rec->own_host = g_strdup(value);
-		rec->own_ip = NULL;
+		rec->own_ip4 = rec->own_ip6 = NULL;
 	}
 
 	signal_emit("server add fill", 2, rec, optlist);
diff --git a/src/fe-common/irc/fe-ircnet.c b/src/fe-common/irc/fe-ircnet.c
index 4071f367..6618edd7 100644
--- a/src/fe-common/irc/fe-ircnet.c
+++ b/src/fe-common/irc/fe-ircnet.c
@@ -108,7 +108,7 @@ static void cmd_network_add(const char *data)
 		if (g_hash_table_lookup(optlist, "realname")) g_free_and_null(rec->realname);
 		if (g_hash_table_lookup(optlist, "host")) {
 			g_free_and_null(rec->own_host);
-                        rec->own_ip = NULL;
+                        rec->own_ip4 = rec->own_ip6 = NULL;
 		}
 		if (g_hash_table_lookup(optlist, "usermode")) g_free_and_null(rec->usermode);
 		if (g_hash_table_lookup(optlist, "autosendcmd")) g_free_and_null(rec->autosendcmd);
@@ -140,7 +140,7 @@ static void cmd_network_add(const char *data)
 	value = g_hash_table_lookup(optlist, "host");
 	if (value != NULL && *value != '\0') {
 		rec->own_host = g_strdup(value);
-		rec->own_ip = NULL;
+		rec->own_ip4 = rec->own_ip6 = NULL;
 	}
 
 	value = g_hash_table_lookup(optlist, "usermode");
diff --git a/src/irc/dcc/dcc.c b/src/irc/dcc/dcc.c
index 7fef2ae5..17f6c477 100644
--- a/src/irc/dcc/dcc.c
+++ b/src/irc/dcc/dcc.c
@@ -264,12 +264,12 @@ GIOChannel *dcc_connect_ip(IPADDR *ip, int port)
 	}
 
 	if (own_ip == NULL)
-		own_ip = &source_host_ip;
+		own_ip = IPADDR_IS_V6(ip) ? source_host_ip6 : source_host_ip4;
 
 	handle = net_connect_ip(ip, port, own_ip);
 	if (handle == NULL && errno == EADDRNOTAVAIL && own_ip != NULL) {
 		/* dcc_own_ip is external address */
-		own_ip = &source_host_ip;
+		own_ip = IPADDR_IS_V6(ip) ? source_host_ip6 : source_host_ip4;
 		handle = net_connect_ip(ip, port, own_ip);
 	}
 	return handle;
diff --git a/src/irc/proxy/listen.c b/src/irc/proxy/listen.c
index 16950c79..dcc94e6b 100644
--- a/src/irc/proxy/listen.c
+++ b/src/irc/proxy/listen.c
@@ -585,7 +585,7 @@ static LISTEN_REC *find_listen(const char *ircnet, int port)
 static void add_listen(const char *ircnet, int port)
 {
 	LISTEN_REC *rec;
-	IPADDR ip, *my_ip;
+	IPADDR ip4, ip6, *my_ip;
 
 	if (port <= 0 || *ircnet == '\0')
 		return;
@@ -593,13 +593,16 @@ static void add_listen(const char *ircnet, int port)
 	/* bind to specific host/ip? */
 	my_ip = NULL;
 	if (*settings_get_str("irssiproxy_bind") != '\0') {
-		if (net_gethostbyname(settings_get_str("irssiproxy_bind"), &ip) != 0) {
+		if (net_gethostbyname(settings_get_str("irssiproxy_bind"),
+				      &ip4, &ip6) != 0) {
 			printtext(NULL, NULL, MSGLEVEL_CLIENTERROR,
 				  "Proxy: can not resolve '%s' - aborting",
 				  settings_get_str("irssiproxy_bind"));
 			return;
 		}
-		my_ip = &ip;
+
+		my_ip = ip6.family == 0 ? &ip4 : ip4.family == 0 ||
+			settings_get_bool("resolve_prefer_ipv6") ? &ip6 : &ip4;
 	}
 
 	rec = g_new0(LISTEN_REC, 1);