(Lianja) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loSsh1 = createobject("CkSsh")

// Hostname may be an IP address or domain name:
lcHostname = "192.168.1.108"
lcPort = 22

// Connect directly to the 1st SSH server:
llSuccess = loSsh1.Connect(lcHostname,lcPort)
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

// Wait a max of 15 seconds when reading responses..
loSsh1.IdleTimeoutMs = 15000

// Authenticate using login/password:
llSuccess = loSsh1.AuthenticatePw("myLogin","myPassword")
if (llSuccess <> .T.) then
    ? loSsh1.LastErrorText
    release loSsh1
    return
endif

// Connect through the 1st SSH connection to reach a 2nd SSH server.
// Note: Any number of SSH connections may be simultaneously tunneled through a single
// existing SSH connection.
loSsh2 = createobject("CkSsh")
llSuccess = loSsh2.ConnectThroughSsh(loSsh1,"someremoteserver.com",22)
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

loSsh2.IdleTimeoutMs = 15000

// Authenticate with ssh2...
llSuccess = loSsh2.AuthenticatePw("myLogin2","myPassword2")
if (llSuccess <> .T.) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

// The application may now is connected and authenticated with ssh2.
// The application can do whatever it desires just as if it was directly
// connected to ssh2.   For example, the application might open
// a session channel to send commands or start a remote shell..
lnChannelNum = loSsh2.OpenSessionChannel()
if (lnChannelNum < 0) then
    ? loSsh2.LastErrorText
    release loSsh1
    release loSsh2
    return
endif

// ...
// ...
// ...

// Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
// The connection with ssh1 is still alive, and may be used for more connections.
loSsh2.Disconnect()

// ...
// ...
// ...

loSsh1.Disconnect()


release loSsh1
release loSsh2