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authorUlrich Drepper <drepper@redhat.com>2007-06-18 22:22:57 +0000
committerUlrich Drepper <drepper@redhat.com>2007-06-18 22:22:57 +0000
commitae1ad3aebbc397212b4bb2eec92ff19f8c1f913a (patch)
treeb1ec4a328c2f5065d05e19ca024ed9be58dcf28c /resolv/res_send.c
parent3abee0b7f15aadf44f442ccdea30f0bdbe113293 (diff)
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[BZ #4647]
            Tomas Janousek  <tjanouse@redhat.com>
            Ulrich Drepper  <drepper@redhat.com>

	[BZ #4647]
	* resolv/res_send.c (send_dg): Remove socket_pf.  Use ipv6_unavail
	member in __res_state, only convaddr4to6 if nssocks[ns] is a PF_INET6
	socket.
	* resolv/resolv.h (__res_state): Add ipv6_unavail member.  Make
	unused member a bitmap.
	* resolv/res_init.c (__res_vinit): Reset ipv6_unavail if IPv6
	servers are configured.

2007-06-18  Jakub Jelinek  <jakub@redhat.com>
Diffstat (limited to 'resolv/res_send.c')
-rw-r--r--resolv/res_send.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/resolv/res_send.c b/resolv/res_send.c
index f38c399ffd..27dd1d4351 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -813,17 +813,20 @@ send_dg(res_state statp,
 	struct pollfd pfd[1];
         int ptimeout;
 	struct sockaddr_in6 from;
-	static int socket_pf = 0;
 	socklen_t fromlen;
 	int resplen, seconds, n;
 
 	if (EXT(statp).nssocks[ns] == -1) {
 		/* only try IPv6 if IPv6 NS and if not failed before */
-		if ((EXT(statp).nscount6 > 0) && (socket_pf != PF_INET)) {
+		if ((EXT(statp).nscount6 > 0) && !statp->ipv6_unavail) {
 			EXT(statp).nssocks[ns] =
 			    socket(PF_INET6, SOCK_DGRAM, 0);
-			socket_pf = EXT(statp).nssocks[ns] < 0 ? PF_INET
-			                                       : PF_INET6;
+			if (EXT(statp).nssocks[ns] < 0)
+			    statp->ipv6_unavail = errno == EAFNOSUPPORT;
+			/* If IPv6 socket and nsap is IPv4, make it
+			   IPv4-mapped */
+			else if (nsap->sin6_family == AF_INET)
+			    convaddr4to6(nsap);
 		}
 		if (EXT(statp).nssocks[ns] < 0)
 			EXT(statp).nssocks[ns] = socket(PF_INET, SOCK_DGRAM, 0);
@@ -832,9 +835,7 @@ send_dg(res_state statp,
 			Perror(statp, stderr, "socket(dg)", errno);
 			return (-1);
 		}
-		/* If IPv6 socket and nsap is IPv4, make it IPv4-mapped */
-		if ((socket_pf == PF_INET6) && (nsap->sin6_family == AF_INET))
-			convaddr4to6(nsap);
+
 		/*
 		 * On a 4.3BSD+ machine (client and server,
 		 * actually), sending to a nameserver datagram