CkPython

SSH Tunnel Thread Activity Log

Demonstrates the tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath, which record the activity of the SSH tunnel and client-manager threads.

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

Background: This is the counterpart to the accept log, covering the SSH side rather than the listener: the tunnel and client-manager threads that actually move data. As with the accept log, KeepTunnelLog enables the in-memory TunnelLog while TunnelLogPath writes a separate file. Together the two logs let you localize a problem to either the accepting side or the forwarding side.

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import sys
import chilkat

success = False

#  Demonstrates the SshTunnel tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath.
#  
#  These log the activity of the SSH tunnel and client-manager threads.

tunnel = chilkat.CkSshTunnel()

#  Retain the SSH tunnel-thread activity in memory so it can be read from the TunnelLog property.
tunnel.put_KeepTunnelLog(True)

#  Optionally also write the tunnel-thread activity to a file (separate from the in-memory log).
tunnel.put_TunnelLogPath("qa_output/tunnel.log")

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()

#  ... clients transfer data through the tunnel ...

#  Read the accumulated in-memory tunnel log.
print(tunnel.tunnelLog())

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