dns: iterate over all configured nameservers

Previously if there were three nameservers configured and third one was
reachable via IPv6 we didn't sent query to it, since NSCOUNT6 was equal to
one. Clearly it was the original intention to sent query to all IPv6
nameservers.

Reported-by: Benedikt Gollatz <benedikt@gollatz.net>

diff --git a/dns.c b/dns.c
index 221665d278bab7895eb61790db689178f1bd0df9..e89fd4bcd959e4ee66abbaac0e05e0ec86dd5c46 100644 (file)
--- a/dns.c
+++ b/dns.c
@@ -938,7 +938,7 @@ void dorequest(char *s,int type,word id)
   hp->id = id; /* htons() deliberately left out (redundant) */
 #ifdef ENABLE_IPV6
   if (resfd6 > 0) {
-    for (i = 0;i < NSCOUNT6;i++) {
+    for (i = 0;i < myres.nscount;i++) {
       if (!NSSOCKADDR6(i))
        continue;
       if (NSSOCKADDR6(i)->sin6_family == AF_INET6)
@@ -1342,7 +1342,7 @@ void dns_ack6(void)
     /* Check to see if this server is actually one we sent to */
     if ( addrcmp( (void *) &(from6->sin6_addr), (void *) &localhost6,
                   (int) AF_INET6 ) == 0 ) {
-      for (i = 0;i < NSCOUNT6;i++) {
+      for (i = 0;i < myres.nscount;i++) {
         if (!NSSOCKADDR6(i))
           continue;
 
@@ -1353,14 +1353,14 @@ void dns_ack6(void)
          break;
       }
     } else
-      for (i = 0;i < NSCOUNT6;i++) {
+      for (i = 0;i < myres.nscount;i++) {
         if (!NSSOCKADDR6(i))
           continue;
        if ( addrcmp( (void *) &(NSSOCKADDR6(i)->sin6_addr),
                      (void *) &(from6->sin6_addr), AF_INET6 ) == 0 )
          break;
       }
-    if (i == NSCOUNT6) {
+    if (i == myres.nscount) {
       snprintf(tempstring, sizeof(tempstring), 
               "Resolver error: Received reply from unknown source: %s",
               inet_ntop( AF_INET6, &(from6->sin6_addr), addrstr,