glibc/getaddrinfo-ipv6-sanity.diff

References: bnc#361697

Index: sysdeps/posix/getaddrinfo.c
===================================================================
--- sysdeps/posix/getaddrinfo.c.orig
+++ sysdeps/posix/getaddrinfo.c
@@ -269,7 +269,7 @@ extern service_user *__nss_hosts_databas
 static int
 gaih_inet (const char *name, const struct gaih_service *service,
 	   const struct addrinfo *req, struct addrinfo **pai,
-	   unsigned int *naddrs)
+	   unsigned int *naddrs, bool usable_ipv6)
 {
   const struct gaih_typeproto *tp = gaih_inet_typeproto;
   struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
@@ -832,7 +832,10 @@ gaih_inet (const char *name, const struc
 	      no_data = 0;
 	      nss_gethostbyname4_r fct4
 		= __nss_lookup_function (nip, "gethostbyname4_r");
-	      if (fct4 != NULL)
+	      /* If we don't want ipv6, don't use gethostbyname4_r,
+	         as it's using T_UNSPEC to libc_res_nsearch, which always
+		 create T_A and T_AAAA queries.  */
+	      if (usable_ipv6 && fct4 != NULL)
 		{
 		  int herrno;
 
@@ -935,7 +938,7 @@ gaih_inet (const char *name, const struc
 		  if (fct != NULL)
 		    {
 		      if (req->ai_family == AF_INET6
-			  || req->ai_family == AF_UNSPEC)
+			  || (req->ai_family == AF_UNSPEC && usable_ipv6))
 			{
 			  gethosts (AF_INET6, struct in6_addr);
 			  no_inet6_data = no_data;
@@ -2418,7 +2421,7 @@ getaddrinfo (const char *name, const cha
   if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET
       || hints->ai_family == AF_INET6)
     {
-      last_i = gaih_inet (name, pservice, hints, end, &naddrs);
+      last_i = gaih_inet (name, pservice, hints, end, &naddrs, seen_ipv6);
       if (last_i != 0)
 	{
 	  freeaddrinfo (p);