Cope with multiple interfaces with the same LL address.

CHANGELOG

@@ -49,6 +49,10 @@ version 2.73
 	    sometimes reasons to do it. (Step forward, GFW).
 	    To avoid misuse, there's a hard limit on the TTL 
 	    floor of one hour. Thansk to RinSatsuki for the patch.
+
+	    Cope with multiple interfaces with the same link-local 
+	    address. (IPv6 addresses are scoped, so this is allowed.)
+	    Thanks to Cory Benfield for help with this.
 	
 	
 version 2.72

src/auth.c

@@ -413,7 +413,10 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		peer_addr->in.sin_port = 0;
 #ifdef HAVE_IPV6
 	      else
-		peer_addr->in6.sin6_port = 0; 
+		{
+		  peer_addr->in6.sin6_port = 0; 
+		  peer_addr->in6.sin6_scope_id = 0;
+		}
 #endif
 	      
 	      for (peers = daemon->auth_peers; peers; peers = peers->next)

src/util.c

@@ -274,6 +274,7 @@ int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2)
 #ifdef HAVE_IPV6      
       if (s1->sa.sa_family == AF_INET6 &&
 	  s1->in6.sin6_port == s2->in6.sin6_port &&
+	  s1->in6.sin6_scope_id == s2->in6.sin6_scope_id &&
 	  IN6_ARE_ADDR_EQUAL(&s1->in6.sin6_addr, &s2->in6.sin6_addr))
 	return 1;
 #endif