teltailnet
Teltailnet is a Telnet proxy that may be useful if you want to expose a machine that supports telnet to computers on your Tailscale network, but don't want to expose it to the internet.
Usage
First start the server:
go run ./cmd/teltailnet -connect bat.org:23
Authorize the server using the URL in the log, or set $TS_AUTHKEY beforehand.
The server will print out an IP and port that it is proxying on, for example:
teltailnet: listening on: 100.100.100.100:23
Then connect to the server using any telnet client. For convenience, an extremely basic telnet client is included in this repository:
go run ./cmd/telnet -connect 100.100.100:23
Building
To build binaries, use go build ./cmd/teltailnet.
How it works
This proxy is implemented using tsnet
the embedded Tailscale library. It starts a Tailscale node inside the teltailnet
process. The tsnet node listens for incoming connections on port 23, and on
receiving a connection it opens a new upstream connection to the IP:port
specified by the -connect flag.
The connections are established using the ziutek/telnet library.
License
MIT