Chilkat2-Python

TCP or TLS over Multiple Hop SSH to Remote Server

See more Socket/SSL/TLS Examples

Demonstrates how to use the Chilkat Socket API to connect to a remote server (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => DestinationServer

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

Chilkat2-Python

import sys
import chilkat2

success = False

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

ssh1 = chilkat2.Ssh()

# Connect directly to the 1st SSH server.
success = ssh1.Connect("serverssh1.com",22)
if (success != True):
    print(ssh1.LastErrorText)
    sys.exit()

# Authenticate using login/password:
success = ssh1.AuthenticatePw("ssh1Login","ssh1Password")
if (success != True):
    print(ssh1.LastErrorText)
    sys.exit()

# 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.
ssh2 = chilkat2.Ssh()
success = ssh2.ConnectThroughSsh(ssh1,"serverssh2.com",22)
if (success != True):
    print(ssh2.LastErrorText)
    sys.exit()

# Authenticate with ssh2...
success = ssh2.AuthenticatePw("ssh2Login","ssh2Password")
if (success != True):
    print(ssh2.LastErrorText)
    sys.exit()

socket = chilkat2.Socket()

# Tell the socket object to connect to our destination server though the ssh2 tunnel (which itself is routed through ssh1).
# The connection looks like this:  ApplicationSocket(TLS) => ServerSSH1 => ServerSSH2 => DestinationServer
success = socket.UseSsh(ssh2)
if (success != True):
    print(socket.LastErrorText)
    sys.exit()

# Connect using TLS to www.chilkatsoft.com
# We could also tunnel a bare TCP connection by specifying port 80 with useTls = False.
useTls = True
maxWaitMillisec = 20000
success = socket.Connect("www.chilkatsoft.com",443,useTls,maxWaitMillisec)
if (success != True):
    print(socket.LastErrorText)
    sys.exit()

# Once the multiple hop SSH tunneled connection is setup,  the socket programming
# is identical to the normal case where we have a direct connection.

# Tell the socket object that all text is to be sent in the utf-8 encoding,
# and the text received is assumed to be utf-8.
socket.StringCharset = "utf-8"

# Send an HTTP HEAD request:
success = socket.SendString("HEAD / HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n")
if (success != True):
    print(socket.LastErrorText)
    sys.exit()

# Wait a maximum of 4 seconds while no data is forthcoming:
socket.MaxReadIdleMs = 4000

# Get the 1st response line, which should be "HTTP/1.1 200 OK"
responseStatusLine = socket.ReceiveToCRLF()
if (socket.LastMethodSuccess != True):
    print(socket.LastErrorText)
    sys.exit()

print("StatusLine: " + responseStatusLine)

# Now get the 1st line of the response header:
responseHeaderLine = socket.ReceiveToCRLF()
if (socket.LastMethodSuccess != True):
    print(socket.LastErrorText)
    sys.exit()

print("HeaderLine: " + responseHeaderLine)

# Now read the remainder of the response header by reading until a double CRLF is seen:
remainderOfHeader = socket.ReceiveUntilMatch("\r\n\r\n")
if (socket.LastMethodSuccess != True):
    print(socket.LastErrorText)
    sys.exit()

print("Remainder: " + remainderOfHeader)

# Close the connection with the server.  This closes the tunnel through ssh2.
# Wait a max of 20 seconds (20000 millsec)
success = socket.Close(20000)

# 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.
ssh2.Disconnect()

ssh1.Disconnect()