I have a relay in the middle which complicates the question. The destination is a VyOS router, with socat wrapping and extending the local serial connection. There may be configuration options with both that I missed.
Sent with Proton Mail secure email. On Tuesday, January 14th, 2025 at 7:42 PM, Michael Jumper <mjum...@apache.org> wrote: > On 1/14/25 8:06 AM, viktor_krumm wrote: > > > I would have suggested this in Jira as a feature request, but I do not seem > > to have access. > > > > When using Guacamole Telnet client to access a remote host, it was > > duplicating echo. This was a simple fix in src/protocols/telnet/client.c > > line 78. I changed echo_enabled from 1 to 0. This required recompiling the > > C code. I rebuilt the docker image for guacamole-server, and deployed the > > custom image instead of the Apache image. > > > > This feature request is to possibly expose that option in the Guacamole > > client itself, like many of the VNC and SSH options. Is it possible to > > rewrite the C code to accept those parameters as runtime variables? Or > > dockerfile build parameters? Or is that too complicated for a simple and > > likely rarely used feature? > > > Can you share what telnet server you're using? > > This aspect of telnet is negotiated by the server and client when the > connection starts. If you're seeing duplicated echo, that suggests that > your telnet server may just not be negotiating this: > > https://github.com/apache/guacamole-server/blob/32dbdfae14fb3d41d113d37f87a61d3719fa8b21/src/protocols/telnet/telnet.c#L293-L303 > > That, or we're sending the wrong thing in our own side of the negotiation: > > https://github.com/apache/guacamole-server/blob/32dbdfae14fb3d41d113d37f87a61d3719fa8b21/src/protocols/telnet/telnet.c#L48-L60 > > - Mike
