Using os.forkpty() to create a pseudo-terminal to ssh to a remote server and communicate with it

2024/4/15 0:44:17

I'm trying to write a python script that can ssh into remote server and can execute simple commands like ls,cd from the python client. However, I'm not able to read the output from the pseudo-terminal after successfully ssh'ing into the server. Could anyone please help me here so that I could execute some commands on the server.

Here is the sample code:

#!/usr/bin/python2.6
import os,sys,time,thread
pid,fd = os.forkpty()
if pid == 0:os.execv('/usr/bin/ssh',['/usr/bin/ssh','user@host',])sys.exit(0)
else:output = os.read(fd,1024)print outputdata = outputos.write(fd,'password\n')time.sleep(1)output = os.read(fd,1024)print outputos.write(fd,'ls\n')output = os.read(fd,1024)print output

Sample output:

user@host's password: Last login: Wed Aug 24 03:16:57 2011 from 1x.x.x.xxxx-bash: ulimit: open files: cannot modify limit: Operation not permitted
host: /home/user>ls
Answer

I'd suggest trying the module pexpect, which is built exactly for this sort of thing (interfacing with other applications via pseudo-TTYs), or Fabric, which is built for this sort of thing more abstractly (automating system administration tasks on remote servers using SSH).

pexpect: http://pypi.python.org/pypi/pexpect/

Fabric: http://docs.fabfile.org/en/1.11/

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