CkPython

Open a Custom SSH Channel Type

Demonstrates the Chilkat Ssh.OpenCustomChannel method, which requests a channel whose application-defined type is supplied as the only argument. It returns the channel number, or -1 if the server rejects the channel. The server must implement that channel type.

Background: The SSH protocol allows vendor- and application-specific channel types beyond the standard session and direct-tcpip kinds; by convention these carry an @domain suffix to avoid name collisions. This method is the escape hatch for talking to a server that implements such a type. On rejection, inspect ChannelOpenFailCode to learn why.

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import sys
import chilkat

success = False

#  Demonstrates the Ssh.OpenCustomChannel method, which requests a custom SSH channel whose
#  application-defined type is supplied as the only argument.  It returns the channel number,
#  or -1 if the server rejects the channel.  The server must implement that channel type.

ssh = chilkat.CkSsh()

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

#  Request an application-defined channel type.  The server must support it.
channelType = "my-custom-channel@example.com"
channelNum = ssh.OpenCustomChannel(channelType)
if (channelNum < 0):
    print(ssh.lastErrorText())
    sys.exit()

print("Opened custom channel: " + str(channelNum))

#  The channel is used with the normal channel send, receive, EOF, CLOSE, and release methods.

ssh.Disconnect()