Lua

Send an SSH IGNORE Message

Demonstrates the Chilkat Ssh.SendIgnore method, which sends an SSH IGNORE message. It takes no arguments. The server does not reply, but a successful send helps confirm the connection is still writable. No channel is required.

Background: The SSH IGNORE message is discarded by the peer by design; its usefulness is as a lightweight keep-alive or liveness probe. Because it exercises the actual write path, a successful SendIgnore is stronger evidence than CheckConnection that the link is still usable, without side effects on any channel.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Ssh.SendIgnore method, which sends an SSH IGNORE message.  It takes no
-- arguments.  The server does not reply, but a successful send helps confirm the connection is
-- still writable.  No channel is required.

local ssh = chilkat.Ssh.new()

-- Connect to the SSH server.  Port 22 is the usual SSH port.
local sshPort = 22
local success = ssh:connect("ssh.example.com", sshPort)
if not success then
    print(ssh.last_error_text)
    return
end

-- 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.
local password = "mySshPassword"

success = ssh:authenticate_pw("mySshLogin", password)
if not success then
    print(ssh.last_error_text)
    return
end

-- Send an IGNORE message to verify the connection is still writable.
success = ssh:send_ignore()
if not success then
    print(ssh.last_error_text)
    return
end

print("IGNORE message sent.")

ssh:disconnect()