(CkPython) SSH Remote Shell

Demonstrates how to start a shell on a remote SSH server, run a command, and retrieve the output.

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import sys
import chilkat

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

ssh = chilkat.CkSsh()

# Hostname may be an IP address or hostname:
hostname = "www.some-ssh-server.com"
port = 22

# Connect to an SSH server:
success = ssh.Connect(hostname,port)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Wait a max of 5 seconds when reading responses..
ssh.put_IdleTimeoutMs(5000)

# Authenticate using login/password:
success = ssh.AuthenticatePw("myLogin","myPassword")
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Open a session channel.  (It is possible to have multiple
# session channels open simultaneously.)

channelNum = ssh.OpenSessionChannel()
if (channelNum < 0):
    print(ssh.lastErrorText())
    sys.exit()

# Some SSH servers require a pseudo-terminal
# If so, include the call to SendReqPty.  If not, then 
# comment out the call to SendReqPty.
# Note: The 2nd argument of SendReqPty is the terminal type,
# which should be something like "xterm", "vt100", "dumb", etc.
# A "dumb" terminal is one that cannot process escape sequences.
# Smart terminals, such as "xterm", "vt100", etc. process
# escape sequences.  If you select a type of smart terminal,
# your application will receive these escape sequences
# included in the command's output.  Use "dumb" if you do not
# want to receive escape sequences.  (Assuming your SSH
# server recognizes "dumb" as a standard dumb terminal.)
termType = "dumb"
widthInChars = 120
heightInChars = 40
# Use 0 for pixWidth and pixHeight when the dimensions
# are set in number-of-chars.
pixWidth = 0
pixHeight = 0
success = ssh.SendReqPty(channelNum,termType,widthInChars,heightInChars,pixWidth,pixHeight)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Start a shell on the channel:
success = ssh.SendReqShell(channelNum)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Start a command in the remote shell.  This example
# will send a "ls" command to retrieve the directory listing.
success = ssh.ChannelSendString(channelNum,"ls\r\n","ansi")
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Send an EOF.  This tells the server that no more data will 
# be sent on this channel.  The channel remains open, and
# the SSH client may still receive output on this channel.
success = ssh.ChannelSendEof(channelNum)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Read whatever output may already be available on the
# SSH connection.  ChannelReadAndPoll returns the number of bytes
# that are available in the channel's internal buffer that
# are ready to be "picked up" by calling GetReceivedText
# or GetReceivedData.
# A return value of -1 indicates failure.
# A return value of -2 indicates a failure via timeout.

# The ChannelReadAndPoll method waits
# for data to arrive on the connection usingi the IdleTimeoutMs
# property setting.  Once the first data arrives, it continues
# reading but instead uses the pollTimeoutMs passed in the 2nd argument:
# A return value of -2 indicates a timeout where no data is received.

pollTimeoutMs = 2000
n = ssh.ChannelReadAndPoll(channelNum,pollTimeoutMs)
if (n < 0):
    print(ssh.lastErrorText())
    sys.exit()

# Close the channel:
success = ssh.ChannelSendClose(channelNum)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Perhaps we did not receive all of the commands output.
# To make sure,  call ChannelReceiveToClose to accumulate any remaining
# output until the server's corresponding "channel close" is received.
success = ssh.ChannelReceiveToClose(channelNum)
if (success != True):
    print(ssh.lastErrorText())
    sys.exit()

# Let's pickup the accumulated output of the command:
cmdOutput = ssh.getReceivedText(channelNum,"ansi")
if (ssh.get_LastMethodSuccess() != True):
    print(ssh.lastErrorText())
    sys.exit()

# Display the remote shell's command output:
print(cmdOutput)

# Disconnect
ssh.Disconnect()