Question

SSH in python

Asked by: Mytix

Hi all,
Im trying to build a custom SSh client in python using sockets in windows.
below is a snippet of my function in the code

#!/usr/bin/env python
import os
import sys
from socket import *


localPortNo=8000
maxTries=10
blockSize=65536*16

def createTCPSocketSSH (remoteHostname, remotePort=22, localPort=-1):
    global localPortNo
    if localPort == -1:
        localPort = localPortNo
        localPortNo = localPortNo+1
    tryNo = 1
    while 1:
        command = "ssh -f -g -A -X %s\n" \
                  % (remoteHostname)        
        result = os.system(command)
        if result == 0:
            break
        localPortNo = localPortNo+1
        tryNo = tryNo + 1
        if tryNo == maxTries:
            os.exit(1)


    # create a TCP socket which connects to our ssh pipe
    s = socket(AF_INET, SOCK_STREAM)
    s.connect(("localhost", localPort))
    return s

It seems that everytime I run it, it give me this error
" 'ssh' is not recognized as an internal or external command, operable program or batch file. "
What is causing this? Are there any other examples of SSH clients using sockets? Im trying to use twisted framework but it seems to be unstable ( cant login twice). Any help on either is greatly appriciated!
Thanks
Marc

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Asked On
2005-07-27 at 19:01:46ID21507060
Tags

python

,

ssh

Topic

Python Scripting Language

Participating Experts
2
Points
300
Comments
5

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Answers

 

by: ramromPosted on 2005-07-28 at 07:12:53ID: 14545847

Running under Windows? How are you starting the program? At a Command Prompt?

The error suggests you are doing C>ssh Is that true?

 

by: MytixPosted on 2005-07-28 at 18:42:32ID: 14551459

'doh...okay....got it there, but I still want to run SSH in windows from python...
i'm currently using paramiko....this is a sample of my code which does an ls -al twice and doesnt seem to be working (note the server info is alright). Any other suggestion for a stable multi platform ssh client?

#!/usr/bin/env python

import sys, os, socket, threading
import paramiko, base64

blockSize=65536*16
server = host = "localhost"
port = 22
buf = 1024
addr =(host,port)
user = "user1"
passwrd = "user1"

t = paramiko.Transport(host)
t.connect(username=user, password=passwrd)
chan = t.open_session()

chan.exec_command('ls -al')
for line in chan.makefile('r+'):
    print line.strip('\n')

chan.exec_command('ls -al')
for line in chan.makefile('r+'):
    print line.strip('\n')
chan.close()
t.close()

 

by: ramromPosted on 2005-07-29 at 19:21:40ID: 14559943

The more you say the less I understand. It sounds like you have multiple problems. Is that true?

What is the name of the module of your first code example?

Exactly what are you doing to run it?

What does "got it there" mean?

What does "doesnt seem to be working" mean. What is not working and what is the evidence?

What does "stable" mean?

If you can provide clear explanations we might be able to help. Otherwise we are more lost than you are.

 

by: MytixPosted on 2005-07-29 at 21:09:27ID: 14560131

okay...let me clarify...disregard the first code's example......i've found the problem and im using my second code as the question.
the second code (which requires the paramiko module) works half way....when I try to `ls -al` the first time it work...when I try to do it again..it says that chan is not open for exec_command.
Stable meaning that if i execute a command it doesnt disconnect me from the server or the connection can be maintained using simple commands in the code. Twisted framework is abit unstable because everytime I execute a command and close a connection...the next time I try to open it, it becomes non-responsive...
Any ideas?

 

by: TraltixxPosted on 2005-07-31 at 15:22:09ID: 14566481

Hmmm, well what about doing it like this:

#!/usr/bin/env python

import sys, os, socket, threading
import paramiko, base64

blockSize=65536*16
server = host = "localhost"
port = 22
buf = 1024
addr =(host,port)
user = "user1"
passwrd = "user1"

t = paramiko.Transport(host)
t.connect(username=user, password=passwrd)
chan = t.open_session()

chan.exec_command('ls -al')
for line in chan.makefile('r+'):
   print line.strip('\n')
chan.close()
t.close()


t = paramiko.Transport(host)
t.connect(username=user, password=passwrd)
chan = t.open_session()

chan.exec_command('ls -al')
for line in chan.makefile('r+'):
   print line.strip('\n')
chan.close()
t.close()

It does `ls -al` twice but makes the connection twice. This way works but you have the overhead of reconnecting.

20120131-EE-VQP-002

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