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A customer has come across a DNS server that really just cuts a SRV
reply if it's too long. This makes the packet invalid according to
ndr_pull and according to wireshark. DNS_FLAG_TRUNCATION is however
set. As this seems to be legal according to the DNS RFCs, we need to
hand-parse the first two uint16's and look whether DNS_FLAG_TRUNCATION
is set.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Jan 20 18:01:41 UTC 2022 on sn-devel-184
Call new tsocket_address_inet_from_hostport_strings() instead of
tsocket_address_inet_from_strings() to implement setting a port to query
for a DNS forwarder.
Signed-off-by: Matthew Grant <grantma@mattgrant.net.nz>
Reviewed-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Should make us more robust when dealing with slow DNS servers.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Jan 22 23:37:16 CET 2019 on sn-devel-144
tevent_req_set_endtime internally already calls tevent_req_nomem and thus sets
the error status correctly.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We might want to use the tcp flavor in the future in the forwarder for a
single, persistent TCP connection. Then we can easily re-publish it.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Same signature as the UDP client in the same file. This opens and closes
the socket per request. In the future, we might want to create a
persistent TCP connection for our internal DNS server's forwarder. That
will require proper handling of in-flight requests. Something for
another day.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Time out UDP requests after DNS_REQUEST_TIMEOUT seconds. Currently set
to 2 seconds.
This should fix bug #8878.
Signed-off-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Oct 16 12:58:32 CEST 2012 on sn-devel-104
