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ndb/dns: do recursive lookup for dnsslave=

--- a/sys/src/cmd/ndb/dnnotify.c

+++ b/sys/src/cmd/ndb/dnnotify.c

@@ -58,8 +58,8 @@

 			nips++;

 		return nips;

 	}

-	list = dnresolve(name, Cin, Ta, req, nil, 0, 1, 1, nil);

-	rrcat(&list, dnresolve(name, Cin, Taaaa, req, nil, 0, 1, 1, nil));

+	list = dnresolve(name, Cin, Ta, req, nil, 0, Recurse, 0, nil);

+	rrcat(&list, dnresolve(name, Cin, Taaaa, req, nil, 0, Recurse, 0, nil));

 	rp = list = randomize(list);

 	while(rp != nil && nips < maxips){

 		uchar *ip = ips + nips*IPaddrlen;

--- a/sys/src/cmd/ndb/dnstcp.c

+++ b/sys/src/cmd/ndb/dnstcp.c

@@ -265,8 +265,8 @@

 				return servers;

 			continue;

 		}

-		list = dnresolve(servers->name, Cin, Ta, req, nil, 0, 1, 1, nil);

-		rrcat(&list, dnresolve(servers->name, Cin, Taaaa, req, nil, 0, 1, 1, nil));

+		list = dnresolve(servers->name, Cin, Ta, req, nil, 0, Recurse, 0, nil);

+		rrcat(&list, dnresolve(servers->name, Cin, Taaaa, req, nil, 0, Recurse, 0, nil));

 		for(rp = list; rp != nil; rp = rp->next){

 			if(parseip(ip, rp->ip->name) == -1)

 				continue;