On 13/05/2022 11:37, Heiko Hund wrote:
Have clients set a bit in IV_PROTO, so that servers can make an informed
decision on whether to push --dns to the client. While unknown options
are ignored by clients when pushed, they generate a warning in the log.
That can be circumvented by server backends by checking if bit 7 is set.
Signed-off-by: Heiko Hund <he...@ist.eigentlich.net>
---
src/openvpn/ssl.c | 3 +++
src/openvpn/ssl.h | 3 +++
2 files changed, 6 insertions(+)
diff --git a/src/openvpn/ssl.c b/src/openvpn/ssl.c
index 61dea996..24d7f3f4 100644
--- a/src/openvpn/ssl.c
+++ b/src/openvpn/ssl.c
@@ -1940,6 +1940,9 @@ push_peer_info(struct buffer *buf, struct tls_session
*session)
/* support for P_DATA_V2 */
int iv_proto = IV_PROTO_DATA_V2;
+ /* support for the --dns option */
+ iv_proto |= IV_PROTO_DNS_OPTION;
+
/* support for receiving push_reply before sending
* push request, also signal that the client wants
* to get push-reply messages without without requiring a round
diff --git a/src/openvpn/ssl.h b/src/openvpn/ssl.h
index 0ba86d3e..c8802707 100644
--- a/src/openvpn/ssl.h
+++ b/src/openvpn/ssl.h
@@ -93,6 +93,9 @@
* result. */
#define IV_PROTO_NCP_P2P (1<<5)
+/** Supports the --dns option introduced in version 2.6 */
+#define IV_PROTO_DNS_OPTION (1<<6)
+
/* Default field in X509 to be username */
#define X509_USERNAME_FIELD_DEFAULT "CN"
Only glared on the code and compile tested. LGTM.
Acked-By: David Sommerseth <dav...@openvpn.net>
--
kind regards,
David Sommerseth
OpenVPN Inc
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