- Set SO_REUSEADDR so that the wildcard interface and a more specific

interface port 53 can be used at the same time, and one of the
  daemons is unbound.


git-svn-id: file:///svn/unbound/trunk@2996 be551aaa-1e26-0410-a405-d3ace91eadb9

doc/Changelog

@@ -1,3 +1,8 @@
+31 Oct 2013: Wouter
+	- Set SO_REUSEADDR so that the wildcard interface and a more specific
+	  interface port 53 can be used at the same time, and one of the
+	  daemons is unbound.
+
 22 Oct 2013: Wouter
 	- Patch from Neel Goyal: Add an API call to set an event base on an
 	  existing ub_ctx.  This basically just destroys the current worker and

services/listen_dnsport.c

@@ -91,10 +91,10 @@ verbose_print_addr(struct addrinfo *addr)
 int
 create_udp_sock(int family, int socktype, struct sockaddr* addr,
         socklen_t addrlen, int v6only, int* inuse, int* noproto,
-	int rcv, int snd)
+	int rcv, int snd, int listen)
 {
 	int s;
-#if defined(IPV6_USE_MIN_MTU)
+#if defined(SO_REUSEADDR) || defined(IPV6_USE_MIN_MTU)
 	int on=1;
 #endif
 #ifdef IPV6_MTU
@@ -129,6 +129,25 @@ create_udp_sock(int family, int socktype, struct sockaddr* addr,
 		*noproto = 0;
 		return -1;
 	}
+	if(listen) {
+#ifdef SO_REUSEADDR
+		if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on, 
+			(socklen_t)sizeof(on)) < 0) {
+#ifndef USE_WINSOCK
+			log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
+				strerror(errno));
+			close(s);
+#else
+			log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
+				wsa_strerror(WSAGetLastError()));
+			closesocket(s);
+#endif
+			*noproto = 0;
+			*inuse = 0;
+			return -1;
+		}
+#endif /* SO_REUSEADDR */
+	}
 	if(rcv) {
 #ifdef SO_RCVBUF
 		int got;
@@ -526,7 +545,7 @@ make_sock(int stype, const char* ifname, const char* port,
 		verbose_print_addr(res);
 		s = create_udp_sock(res->ai_family, res->ai_socktype,
 			(struct sockaddr*)res->ai_addr, res->ai_addrlen,
-			v6only, &inuse, &noproto, (int)rcv, (int)snd);
+			v6only, &inuse, &noproto, (int)rcv, (int)snd, 1);
 		if(s == -1 && inuse) {
 			log_err("bind: address already in use");
 		} else if(s == -1 && noproto && hints->ai_family == AF_INET6){

services/listen_dnsport.h

@@ -178,11 +178,13 @@ void listen_start_accept(struct listen_dnsport* listen);
 	IPv6 proto (family) is not available.
  * @param rcv: set size on rcvbuf with socket option, if 0 it is not set.
  * @param snd: set size on sndbuf with socket option, if 0 it is not set.
+ * @param listen: if true, this is a listening UDP port, eg port 53, and 
+ * 	set SO_REUSEADDR on it.
  * @return: the socket. -1 on error.
  */
 int create_udp_sock(int family, int socktype, struct sockaddr* addr, 
 	socklen_t addrlen, int v6only, int* inuse, int* noproto, int rcv,
-	int snd);
+	int snd, int listen);
 
 /**
  * Create and bind TCP listening socket

services/outside_network.c

@@ -849,13 +849,13 @@ udp_sockport(struct sockaddr_storage* addr, socklen_t addrlen, int port,
 		sa->sin6_port = (in_port_t)htons((uint16_t)port);
 		fd = create_udp_sock(AF_INET6, SOCK_DGRAM, 
 			(struct sockaddr*)addr, addrlen, 1, inuse, &noproto,
-			0, 0);
+			0, 0, 0);
 	} else {
 		struct sockaddr_in* sa = (struct sockaddr_in*)addr;
 		sa->sin_port = (in_port_t)htons((uint16_t)port);
 		fd = create_udp_sock(AF_INET, SOCK_DGRAM, 
 			(struct sockaddr*)addr, addrlen, 1, inuse, &noproto,
-			0, 0);
+			0, 0, 0);
 	}
 	return fd;
 }