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* [glibc/release/2.32/master] support: Provide a way to clear the RA bit in DNS server responses
@ 2020-11-10 15:59 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2020-11-10 15:59 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=05c025abca109daf7ddbc9e4562815a4274920ef
commit 05c025abca109daf7ddbc9e4562815a4274920ef
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Oct 14 10:54:39 2020 +0200
support: Provide a way to clear the RA bit in DNS server responses
(cherry picked from commit 08443b19965f48862b02c2fd7b33a39d66daf2ff)
Diff:
---
support/resolv_test.c | 4 +++-
support/resolv_test.h | 4 ++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/support/resolv_test.c b/support/resolv_test.c
index e343c4b516..9878a040a3 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 c46de32ff4..31a5c1c3e7 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;
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