[CTX] [ALL] Telnet gateway to SSH server

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SSH/Telnet gateway

In the Telnet-DeleGate (DeleGate server for Telnet clients), a host name prefixed with "-ssh" and "." (as "-ssh.host") implies a SSH server on the host. In access to such a server, Telnet-DeleGate works as a gateway between the SSH server and a Telnet client. For example, using a Telnet-DeleGate configured like follows, Telnet clients can login to a SSH server on host as user as follows:
% delegated -P8023 SERVER=telnet://-ssh
% telnet -l user@host localhost 8023

The target SSH server can be limited as this:
% delegated -P8023 SERVER=telnet://-ssh.host
% telnet -l user localhost 8023

The user on the target SSH server can be limited as this:
% delegated -P8023 SERVER=telnet://user@-ssh.host
% telnet localhost 8023

The password of the user can be specified as this:
% delegated -P8023 SERVER="telnet://user:pass@-ssh.host"
% telnet localhost 8023

In this case, the Telnet client cannot specify anything about the target SSH server and the login procedure is achieved fully automatically. Reserved characters in the pass part should be escaped with the "%XX" notation (at least "@" must be escaped with "%40").
Telnet clients without the capability to send authentication information with the "-l user" option or so, can specify it in the traditional way of the Telnet-DeleGate as follows:
% delegated -P8023 SERVER=telnet://-ssh
% telnet localhost 8023
>> Host name: user@host

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