Tcl

Connect to an SSH Server

Demonstrates the Chilkat Ssh.Connect method, which establishes a connection to an SSH server. The first argument is the hostname (a DNS name or a numeric IPv4/IPv6 address) and the second is the TCP port, usually 22. Connecting is the first step; authentication follows before any channels can be opened.

Background: Connect establishes only the SSH transport — the encrypted channel and host-key exchange — but does not log in. An SSH session is always used in stages: connect, authenticate, then open one or more channels for shell, exec, or port-forwarding work. Timeouts and optional SOCKS/HTTP proxying are controlled by the object's properties before this call.

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Tcl


load ./chilkat.dll

set success 0

#  Demonstrates the Ssh.Connect method, which establishes a connection to an SSH server.  The
#  1st argument is the hostname (a DNS name or numeric IP) and the 2nd is the TCP port.

set ssh [new_CkSsh]

#  Port 22 is the usual SSH port.
set sshPort 22
set success [CkSsh_Connect $ssh "ssh.example.com" $sshPort]
if {$success == 0} then {
    puts [CkSsh_lastErrorText $ssh]
    delete_CkSsh $ssh
    exit
}

puts "Connected to the SSH server."

#  (Authentication would follow here before opening channels.)

CkSsh_Disconnect $ssh

delete_CkSsh $ssh