From: Florian Weimer <fweimer@redhat.com>
Date: Wed, 14 Oct 2020 08:54:39 +0000 (+0200)
Subject: support: Provide a way to clear the RA bit in DNS server responses
X-Git-Tag: glibc-2.33~390
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=08443b19965f48862b02c2fd7b33a39d66daf2ff;p=thirdparty%2Fglibc.git

support: Provide a way to clear the RA bit in DNS server responses
---

diff --git a/support/resolv_test.c b/support/resolv_test.c
index e343c4b5160..9878a040a3d 100644
--- a/support/resolv_test.c
+++ b/support/resolv_test.c
@@ -181,7 +181,9 @@ resolv_response_init (struct resolv_response_builder *b,
   b->buffer[2] |= b->query_buffer[2] & 0x01; /* Copy the RD bit.  */
   if (flags.tc)
     b->buffer[2] |= 0x02;
-  b->buffer[3] = 0x80 | flags.rcode; /* Always set RA.  */
+  b->buffer[3] = flags.rcode;
+  if (!flags.clear_ra)
+    b->buffer[3] |= 0x80;
   if (flags.ad)
     b->buffer[3] |= 0x20;
 
diff --git a/support/resolv_test.h b/support/resolv_test.h
index c46de32ff4f..31a5c1c3e79 100644
--- a/support/resolv_test.h
+++ b/support/resolv_test.h
@@ -148,6 +148,10 @@ struct resolv_response_flags
   /* If true, the AD (authenticated data) flag will be set.  */
   bool ad;
 
+  /* If true, do not set the RA (recursion available) flag in the
+     response.  */
+  bool clear_ra;
+
   /* Initial section count values.  Can be used to artificially
      increase the counts, for malformed packet testing.*/
   unsigned short qdcount;