# http://hasiru.net/djbdns-ipv6-ooyama.patch

diff -puNr dns_transmit.c dns_transmit.c
--- dns_transmit.c	2008-07-12 14:10:52.000000000 +0900
+++ dns_transmit.c	2008-07-11 15:35:23.000000000 +0900
@@ -104,6 +104,14 @@ static int thisudp(struct dns_transmit *
   while (d->udploop < 4) {
     for (;d->curserver < 16;++d->curserver) {
       ip = d->servers + 16 * d->curserver;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+      if (!fromserver) {
+        if (ip6_isv4mapped(ip))
+          noipv6 = 1;
+        else
+          noipv6 = 0;
+      }
+#endif
       if (byte_diff(ip,16,V6any)) {
 	d->query[2] = dns_random(256);
 	d->query[3] = dns_random(256);
@@ -155,6 +163,14 @@ static int thistcp(struct dns_transmit *
 
   for (;d->curserver < 16;++d->curserver) {
     ip = d->servers + 16 * d->curserver;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+    if (!fromserver) {
+      if (ip6_isv4mapped(ip))
+        noipv6 = 1;
+      else
+        noipv6 = 0;
+    }
+#endif
     if (byte_diff(ip,16,V6any)) {
       d->query[2] = dns_random(256);
       d->query[3] = dns_random(256);
diff -puNr dnscache.c dnscache.c
--- dnscache.c	2008-07-12 14:10:52.000000000 +0900
+++ dnscache.c	2008-07-11 15:32:00.000000000 +0900
@@ -59,6 +59,7 @@ uint64 numqueries = 0;
 
 static int udp53;
 
+
 #define MAXUDP 200
 static struct udpclient {
   struct query q;
@@ -408,11 +409,12 @@ int main()
   if (!ip6_scan(x,myipincoming))
     strerr_die3x(111,FATAL,"unable to parse IP address ",x);
 
-#if 0
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
   /* if if IP is a mapped-IPv4 address, disable IPv6 functionality */
   /* this is actually a bad idea */
   if (ip6_isv4mapped(myipincoming))
     noipv6 = 1;
+  fromserver = 1;
 #endif
 
   udp53 = socket_udp6();
diff -puNr server.c server.c
--- server.c	2008-07-12 14:10:52.000000000 +0900
+++ server.c	2008-07-11 15:33:18.000000000 +0900
@@ -92,6 +92,9 @@ int main()
 {
   char *x;
   int *udp53;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+  int *noipv6s;
+#endif
   unsigned int off;
   unsigned int cnt;
   iopause_fd *iop;
@@ -116,6 +119,11 @@ int main()
   }
   udp53=(int *) alloc(sizeof(int) *cnt);
   if (!udp53) nomem();
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+  noipv6s=(int *) alloc(sizeof(int) *cnt);
+  if (!noipv6s) nomem();
+  fromserver = 1;
+#endif
   iop=(iopause_fd *) alloc(sizeof(*iop) * cnt);
   if (!iop) nomem();
 
@@ -124,6 +132,12 @@ int main()
     unsigned int l;
     uint32 ifid=0;
     l=ip6_scan(x+off,ip);
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+    if (ip6_isv4mapped(ip))
+      noipv6 = noipv6s[cnt] = 1;
+    else
+      noipv6 = noipv6s[cnt] = 0;
+#endif
     udp53[cnt] = socket_udp6();
     if (udp53[cnt] == -1)
       strerr_die2sys(111,fatal,"unable to create UDP socket: ");
@@ -165,6 +179,9 @@ int main()
     iopause(iop,cnt,&deadline,&stamp);
     for (i=0;i<cnt;i++)
       if (iop[i].revents) {
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+        noipv6 = noipv6s[i];
+#endif
 	len = socket_recv6(udp53[i],buf,sizeof buf,ip,&port,&ifid);
 	if (len < 0) continue;
 	if (!doit()) continue;
diff -puNr socket.h socket.h
--- socket.h	2008-07-12 14:10:52.000000000 +0900
+++ socket.h	2008-07-11 15:44:14.000000000 +0900
@@ -34,5 +34,6 @@ extern const char* socket_getifname(uint
 extern uint32 socket_getifidx(const char *ifname);
 
 extern int noipv6;
+extern int fromserver;
 
 #endif
diff -puNr socket_noipv6.c socket_noipv6.c
--- socket_noipv6.c	2008-07-12 14:10:52.000000000 +0900
+++ socket_noipv6.c	2008-07-11 15:30:12.000000000 +0900
@@ -1,5 +1,6 @@
 #include "haveip6.h"
 
+int fromserver=0;
 #ifdef LIBC_HAS_IP6
 int noipv6=0;
 #else