CkPython

SSH Tunnel Per-Client Logging and Client Identifier

Demonstrates the ClientLogDir and ClientIdentifier properties. When ClientLogDir is set, a separate log file is created for each tunnel client; ClientIdentifier is the SSH client-identification string sent during the handshake.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: When many clients share one tunnel, a single combined log is hard to follow, so ClientLogDir gives each connection its own file — the fastest way to diagnose one misbehaving client. ClientIdentifier sets the version string the server sees; overriding the default is occasionally needed for compatibility with servers that key behavior off the client identification, or simply to label your application in server logs.

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import sys
import chilkat

success = False

#  Demonstrates the SshTunnel per-client logging properties ClientLogDir and ClientIdentifier.

tunnel = chilkat.CkSshTunnel()

#  When ClientLogDir is set, a separate log file is created for each tunnel client in this
#  directory, which is useful for troubleshooting individual connections.
tunnel.put_ClientLogDir("qa_output/client_logs")

#  The SSH client-identification string sent to the SSH server during the handshake.
tunnel.put_ClientIdentifier("SSH-2.0-MyTunnelApp_1.0")

tunnel.put_DestHostname("db.internal.example.com")
tunnel.put_DestPort(5432)

sshPort = 22
success = tunnel.Connect("ssh.example.com",sshPort)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
password = "mySshPassword"

success = tunnel.AuthenticatePw("mySshLogin",password)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

listenPort = 1080
success = tunnel.BeginAccepting(listenPort)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()

print("Tunnel running; each client is logged in " + tunnel.clientLogDir())

waitForThreadExit = True
success = tunnel.CloseTunnel(waitForThreadExit)
if (success == False):
    print(tunnel.lastErrorText())
    sys.exit()