(Chilkat2-Python) SSH Remote Shell Multiple Commands

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

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import sys
import chilkat2

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

ssh = chilkat2.Ssh()

# This is the prompt we'll be expecting to find in
# the output of the remote shell.

myPrompt = "chilkat@ubuntu:~/workspace$"

# Connect to an SSH server:

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

success = ssh.Connect(hostname,port)
if (success != True):
    print(ssh.LastErrorText)
    sys.exit()

# Wait a max of 10 seconds when reading responses..
ssh.IdleTimeoutMs = 10000

# 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()

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()

#  Run the 1st command in the remote shell, which will be to
#  "cd" to a subdirectory.
success = ssh.ChannelSendString(channelNum,"cd workspace\r\n","ansi")
if (success != True):
    print(ssh.LastErrorText)
    sys.exit()

# Retrieve the output.
success = ssh.ChannelReceiveUntilMatch(channelNum,myPrompt,"ansi",True)
if (success != True):
    print(ssh.LastErrorText)
    sys.exit()

#  Display what we've received so far.  This clears
#  the internal receive buffer, which is important.
#  After we send the command, we'll be reading until
#  the next command prompt.  If the command prompt
#  is already in the internal receive buffer, it'll think it's
#  already finished...
cmdOutput = ssh.GetReceivedText(channelNum,"ansi")
if (ssh.LastMethodSuccess != True):
    print(ssh.LastErrorText)
    sys.exit()

print(cmdOutput)

#  Run the 2nd command in the remote shell, which will be
#  to "ls" the directory.
success = ssh.ChannelSendString(channelNum,"ls\r\n","ansi")
if (success != True):
    print(ssh.LastErrorText)
    sys.exit()

# Retrieve and display the output.
success = ssh.ChannelReceiveUntilMatch(channelNum,myPrompt,"ansi",True)
if (success != True):
    print(ssh.LastErrorText)
    sys.exit()

cmdOutput = ssh.GetReceivedText(channelNum,"ansi")
if (ssh.LastMethodSuccess != True):
    print(ssh.LastErrorText)
    sys.exit()

print(cmdOutput)

#  Start the final command in the remote shell.  This example
#  will send a "ls -l" command to retrieve the long format directory listing.
success = ssh.ChannelSendString(channelNum,"ls -l\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()

cmdOutput = ssh.GetReceivedText(channelNum,"ansi")
if (ssh.LastMethodSuccess != True):
    print(ssh.LastErrorText)
    sys.exit()

print(cmdOutput)

# Disconnect
ssh.Disconnect()