Not an error: "Non-OpenVPN client protocol detected" in port-share mode

[dcolascione]

Describe the bug
I run OpenVPN in connection-sharing mode. Whenever it forwards a connection to my web server, I see "Non-OpenVPN client protocol detected" in the log. That's fine, but the problem is that the message is logged at error severity when it's not an error. I like my logs to be free of error-level messages, so this message's log level is a mild annoyance.

To Reproduce
Use port-share; logging to systemd journal.

Expected behavior
Message is logged at info-level as it's not a problem.

Version information (please complete the following information):
Debian stable (Trixie)

[cron2]

Indeed, this is a bit weird.

src/openvpn/errlevel.h:#define D_STREAM_ERRORS  LOGLEV(1, 7, M_NONFATAL)   /* TCP stream error requiring restart */
src/openvpn/socket.c:                msg(D_STREAM_ERRORS, "Non-OpenVPN client protocol detected");

D_PROXY (level 2) might be better suited, or maybe even D_PS_PROXY (3)...

#define D_PS_PROXY      LOGLEV(3, 44, 0)            /* messages related to --port-share option */

[cron2]

(Trivial) patch at http://gerrit.openvpn.net/c/openvpn/+/1516 - will apply to about every OpenVPN release (2.4 upwards).

It's likely to go into 2.7.1, possibly into 2.6.19