bind to IPV6-only if ipv6 address was specified (http://redmine.lighttpd.net/projects/lighttpd/wiki/IPv6-Config)

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2758 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -32,6 +32,7 @@ NEWS
   * add libev fdevent handler: server.event-handler = "libev"
   * mod_proxy: return response as soon as it is available (fixes #2196)
   * don't overwrite global server.force-lowercase-filenames setting (fixes #2042)
+  * bind to IPV6-only if ipv6 address was specified (http://redmine.lighttpd.net/projects/lighttpd/wiki/IPv6-Config)
 
 - 1.4.26 - 2010-02-07
   * Fix request parser to handle packets with splitted \r\n\r\n (fixes #2105)

src/base.h

@@ -282,7 +282,7 @@ typedef struct {
 	buffer *ssl_verifyclient_username;
 	unsigned short ssl_verifyclient_export_cert;
 
-	unsigned short use_ipv6;
+	unsigned short use_ipv6, set_v6only; /* set_v6only is only a temporary option */
 	unsigned short defer_accept;
 	unsigned short is_ssl;
 	unsigned short allow_http11;

src/configfile.c

@@ -100,6 +100,9 @@ static int config_insert(server *srv) {
 		{ "ssl.verifyclient.depth",      NULL, T_CONFIG_SHORT,   T_CONFIG_SCOPE_SERVER },     /* 58 */
 		{ "ssl.verifyclient.username",   NULL, T_CONFIG_STRING,  T_CONFIG_SCOPE_SERVER },     /* 59 */
 		{ "ssl.verifyclient.exportcert", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_SERVER },     /* 60 */
+
+		{ "server.set-v6only",           NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 61 */
+
 		{ "server.host",                 "use server.bind instead", T_CONFIG_DEPRECATED, T_CONFIG_SCOPE_UNSET },
 		{ "server.docroot",              "use server.document-root instead", T_CONFIG_DEPRECATED, T_CONFIG_SCOPE_UNSET },
 		{ "server.virtual-root",         "load mod_simple_vhost and use simple-vhost.server-root instead", T_CONFIG_DEPRECATED, T_CONFIG_SCOPE_UNSET },
@@ -170,6 +173,7 @@ static int config_insert(server *srv) {
 		s->is_ssl        = 0;
 		s->ssl_use_sslv2 = 0;
 		s->use_ipv6      = 0;
+		s->set_v6only    = 1;
 		s->defer_accept  = 0;
 #ifdef HAVE_LSTAT
 		s->follow_symlink = 1;
@@ -194,6 +198,7 @@ static int config_insert(server *srv) {
 
 		cv[7].destination = s->server_tag;
 		cv[8].destination = &(s->use_ipv6);
+		cv[61].destination = &(s->set_v6only);
 		cv[54].destination = &(s->defer_accept);
 
 

src/network.c

@@ -225,7 +225,7 @@ static int network_server_init(server *srv, buffer *host_token, specific_config
 
 	val = 1;
 	if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
-		log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt failed:", strerror(errno));
+		log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(SO_REUSEADDR) failed:", strerror(errno));
 		goto error_free_socket;
 	}
 
@@ -236,10 +236,21 @@ static int network_server_init(server *srv, buffer *host_token, specific_config
 		srv_socket->addr.ipv6.sin6_family = AF_INET6;
 		if (host == NULL) {
 			srv_socket->addr.ipv6.sin6_addr = in6addr_any;
+			log_error_write(srv, __FILE__, __LINE__, "s", "warning: please use server.use-ipv6 only for hostnames, not without server.bind / empty address; your config will break if the kernel default for IPV6_V6ONLY changes");
 		} else {
 			struct addrinfo hints, *res;
 			int r;
 
+			if (s->set_v6only) {
+				val = 1;
+				if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) {
+					log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(IPV6_V6ONLY) failed:", strerror(errno));
+					goto error_free_socket;
+				}
+			} else {
+				log_error_write(srv, __FILE__, __LINE__, "s", "warning: server.set-v6only will be removed soon, update your config to have different sockets for ipv4 and ipv6");
+			}
+
 			memset(&hints, 0, sizeof(hints));
 
 			hints.ai_family   = AF_INET6;