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dnstcp: temporarily switch on resolver mode so we can resolve the dnsslaves for axfr check

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

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

@@ -256,6 +256,7 @@

 {

 	uchar ip[IPaddrlen];

 	RR *list, *rp;

+	int tmp;

 	for(; servers != nil; servers = servers->next){

 		if(strcmp(ipattr(servers->name), "ip") == 0){

@@ -265,8 +266,13 @@

 				return servers;

 			continue;

 		}

+

+		tmp = cfg.resolver;

+		cfg.resolver = 1;

 		list = dnresolve(servers->name, Cin, isv4(srcip)? Ta: Taaaa,

 			req, nil, 0, Recurse, 0, nil);

+		cfg.resolver = tmp;

+

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

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

 				continue;