https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=7b1d4c732e474cfba0bcd91b812da90a7298c982 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 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/minires-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 = 0; /* compression not allowed */ PUTDOMAIN(rr->Data.SRV.pNameTarget, ptr); break; default: