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From: Corinna Vinschen <corinna@sourceware.org>
To: cygwin-cvs@sourceware.org
Subject: [newlib-cygwin/cygwin-3_3-branch] Cygwin: resolver: Targets in SRV
 DNS responses may not be compressed
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X-Git-Author: Anton Lavrentiev via Cygwin-patches <cygwin-patches@cygwin.com>
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Date: Wed, 19 Jan 2022 07:55:17 +0000 (GMT)
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https://sourceware.org/git/gitweb.cgi?p=3Dnewlib-cygwin.git;h=3D7b1d4c732e4=
74cfba0bcd91b812da90a7298c982

commit 7b1d4c732e474cfba0bcd91b812da90a7298c982
Author: Anton Lavrentiev via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Tue Jan 18 17:39:16 2022 -0500

    Cygwin: resolver: Targets in SRV DNS responses may not be compressed
   =20
    RFC2782 clearly says so yet it's a common misconception to perform the
    compression in the violation of the standard.  This patch fixes that

Diff:
---
 winsup/cygwin/libc/minires-os-if.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/winsup/cygwin/libc/minires-os-if.c b/winsup/cygwin/libc/minire=
s-os-if.c
index 1dac816eb..dce856076 100644
--- a/winsup/cygwin/libc/minires-os-if.c
+++ b/winsup/cygwin/libc/minires-os-if.c
@@ -159,6 +159,7 @@ static unsigned char * write_record(unsigned char * ptr=
, PDNS_RECORD rr,
       PUTSHORT(rr->Data.SRV.wWeight, ptr);
       PUTSHORT(rr->Data.SRV.wPort, ptr);
     }
+    dnptrs =3D 0;  /* compression not allowed */
     PUTDOMAIN(rr->Data.SRV.pNameTarget, ptr);
     break;
   default: