From 0cfcd91558ef5c03326817e4a907f2e9c1c0c636 Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@etherboot.org>
Date: Sun, 1 May 2005 13:59:34 +0000
Subject: [PATCH] Abort immediately if no nameserver is present.

---
 src/proto/dns.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/proto/dns.c b/src/proto/dns.c
index b2f258bf..d74b29a9 100644
--- a/src/proto/dns.c
+++ b/src/proto/dns.c
@@ -249,6 +249,12 @@ static int dns_resolv ( struct in_addr *addr, const char *name ) {
 	unsigned int recursion = 0;
 	unsigned int id = 1;
 
+	/* Fail immediately if we have no name server */
+	if ( ! arptable[ARP_NAMESERVER].ipaddr.s_addr ) {
+		DBG ( "DNS has no nameserver\n" );
+		return 0;
+	}
+
 	DBG ( "DNS resolving %s\n", name );
 
 	/* Set up the query data */