Multiple SendReqExec on Same Connection

Shows how to execute a series of commands on an SSH server and retrieve each command's output (using SendReqExec). Each call to SendReqExec requires its own logical session channel. This is not a separate TCP/IP connection -- it's simply a new session channel on the existing connection. The sequence of Chilkat SSH calls would look like this:

Connect
AuthenticatePw (or AuthenticatePk)

OpenSessionChannel
SendReqExec

SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

OpenSessionChannel
SendReqExec

SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

...

OpenSessionChannel
SendReqExec

SendChannelClose
ChannelReceiveToClose (to make sure all remaining output is received)

Disconnect

 Chilkat Python Module Downloads for Windows, Linux, and MAC OS X

import sys
import chilkat

#  Important: It is helpful to send the contents of the
#  ssh.LastErrorText property when requesting support.

ssh = chilkat.CkSsh()

#  Any string automatically begins a fully-functional 30-day trial.
success = ssh.UnlockComponent("Anything for 30-day trial")
if (success != True):
    print ssh.lastErrorText()
    sys.exit()

#  Connect to an SSH server:

#  Hostname may be an IP address or hostname:
hostname = "192.168.1.117"
port = 22

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()

#  Request a directory listing on the remote server:
#  If your server is Linux/UNIX, change the string from "dir" to "ls"
#  Note: Some SSH servers require a CRLF instead of a bare-LF
success = ssh.SendReqExec(channelNum,"ls -al\n")
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 (cmdOutput == None ):
    print ssh.lastErrorText()
    sys.exit()

#  Display the remote shell's command output:
print cmdOutput
print "----"

#  -----------------------------------------------------------------
#  Now for the 2nd SendReqExe (on the same connection,
#  but on a separate logical channel).
#  -----------------------------------------------------------------

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

success = ssh.SendReqExec(channelNum,"nslookup chilkatsoft.com\n")
if (success != True):
    print ssh.lastErrorText()
    sys.exit()

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

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

success = ssh.ChannelReceiveToClose(channelNum)
if (success != True):
    print ssh.lastErrorText()
    sys.exit()

cmdOutput = ssh.getReceivedText(channelNum,"ansi")
if (cmdOutput == None ):
    print ssh.lastErrorText()
    sys.exit()

print cmdOutput

#  Disconnect
ssh.Disconnect()