From 211e0a6fc2aa26bba678e2ac43ea9ec746a67105 Mon Sep 17 00:00:00 2001
From: Andreas Gustafsson <source@isc.org>
Date: Fri, 10 Dec 1999 17:31:08 +0000
Subject: [PATCH] the TC bit was only checked in messages that ended
 prematurely; it should be checked always

---
 lib/dns/resolver.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index a2f0e208fc..b163035c7a 100644
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -2783,9 +2783,17 @@ resquery_response(isc_task_t *task, isc_event_t *event) {
 	/*
 	 * Deal with truncated responses by retrying using TCP.
 	 */
+	if ((message->flags & DNS_MESSAGEFLAG_TC) != 0)
+		truncated = ISC_TRUE;
+		
 	if (truncated) {
-		options |= DNS_FETCHOPT_TCP;
-		resend = ISC_TRUE;
+		if ((options & DNS_FETCHOPT_TCP) != 0) {
+			broken_server = ISC_TRUE;
+			keep_trying = ISC_TRUE;
+		} else {
+			options |= DNS_FETCHOPT_TCP;
+			resend = ISC_TRUE;
+		}
 		goto done;
 	}