(Tcl) Multiple Hop SSH to SFTP

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

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load ./chilkat.dll

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

set ssh1 [new_CkSsh]

# Hostname may be an IP address or domain name:
set hostname "192.168.1.111"
set port 22

# Connect directly to the 1st SSH server:
set success [CkSsh_Connect $ssh1 $hostname $port]
if {$success != 1} then {
    puts [CkSsh_lastErrorText $ssh1]
    delete_CkSsh $ssh1
    exit
}

# Authenticate using login/password:
set success [CkSsh_AuthenticatePw $ssh1 "myLogin" "myPassword"]
if {$success != 1} then {
    puts [CkSsh_lastErrorText $ssh1]
    delete_CkSsh $ssh1
    exit
}

# Connect through the 1st SSH connection to reach a 2nd SSH server (for SFTP)
# Note: Any number of connections may be simultaneously tunneled through a single
# existing SSH connection.
set sftp [new_CkSFtp]

# Connect to some SSH/SFTP server through ssh1.
set success [CkSFtp_ConnectThroughSsh $sftp $ssh1 "sftp.someremoteserver.com" 22]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSsh $ssh1
    delete_CkSFtp $sftp
    exit
}

# Authenticate with the SFTP server. 
set success [CkSFtp_AuthenticatePw $sftp "myLogin" "myPassword"]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSsh $ssh1
    delete_CkSFtp $sftp
    exit
}

# After authenticating, the SFTP subsystem must be initialized:
set success [CkSFtp_InitializeSftp $sftp]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSsh $ssh1
    delete_CkSFtp $sftp
    exit
}

# Upload from the local file to the SSH server.
# Important -- the remote filepath is the 1st argument,
# the local filepath is the 2nd argument;
set remoteFilePath "hamlet.xml"
set localFilePath "c:/temp/hamlet.xml"

set success [CkSFtp_UploadFileByName $sftp $remoteFilePath $localFilePath]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSsh $ssh1
    delete_CkSFtp $sftp
    exit
}

puts "Success."

# Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
# The connection with ssh1 is still alive, and may be used for more connections.
CkSFtp_Disconnect $sftp

# ...
# ...
# ...

CkSsh_Disconnect $ssh1

delete_CkSsh $ssh1
delete_CkSFtp $sftp