Chilkat2-Python

SSH Tunnel Listener Activity Log

Demonstrates the listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath, which record the activity of the background listener thread started by BeginAccepting.

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

Background: Because the listener runs on a background thread, an activity log is often the only practical way to see what it is doing — which connections it accepted and when. KeepAcceptLog must be enabled for the in-memory AcceptLog to be populated; AcceptLogPath is an independent file-based log that persists across the run. This log covers the listener specifically, as distinct from the TunnelLog that records the SSH tunnel threads.

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import sys
import chilkat2

success = False

# Demonstrates the SshTunnel listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath.
# 
# These log the activity of the background listener thread started by BeginAccepting.

tunnel = chilkat2.SshTunnel()

# Retain the listener activity log in memory so it can be read from the AcceptLog property.
tunnel.KeepAcceptLog = True

# Optionally also write the listener activity to a file (separate from the in-memory log).
tunnel.AcceptLogPath = "qa_output/accept.log"

tunnel.DestHostname = "db.internal.example.com"
tunnel.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()

# ... the listener accepts connections for a while ...

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

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