src/link/pexpect/examples/ssh_session.py

   1 #
   2 # Eric S. Raymond
   3 #
   4 # Greatly modified by Nigel W. Moriarty
   5 # April 2003
   6 #
   7 from pexpect import *
   8 import os, sys
   9 import getpass
  10 import time
  11
  12 class ssh_session:
  13
  14     "Session with extra state including the password to be used."
  15
  16     def __init__(self, user, host, password=None, verbose=0):
  17
  18         self.user = user
  19         self.host = host
  20         self.verbose = verbose
  21         self.password = password
  22         self.keys = [
  23             'authenticity',
  24             'assword:',
  25             '@@@@@@@@@@@@',
  26             'Command not found.',
  27             EOF,
  28             ]
  29
  30         self.f = open('ssh.out','w')
  31
  32     def __repr__(self):
  33
  34         outl = 'class :'+self.__class__.__name__
  35         for attr in self.__dict__:
  36             if attr == 'password':
  37                 outl += '\n\t'+attr+' : '+'*'*len(self.password)
  38             else:
  39                 outl += '\n\t'+attr+' : '+str(getattr(self, attr))
  40         return outl
  41
  42     def __exec(self, command):
  43
  44         "Execute a command on the remote host.    Return the output."
  45         child = spawn(command,
  46                                     #timeout=10,
  47                                     )
  48         if self.verbose:
  49             sys.stderr.write("-> " + command + "\n")
  50         seen = child.expect(self.keys)
  51         self.f.write(str(child.before) + str(child.after)+'\n')
  52         if seen == 0:
  53             child.sendline('yes')
  54             seen = child.expect(self.keys)
  55         if seen == 1:
  56             if not self.password:
  57                 self.password = getpass.getpass('Remote password: ')
  58             child.sendline(self.password)
  59             child.readline()
  60             time.sleep(5)
  61             # Added to allow the background running of remote process
  62             if not child.isalive():
  63                 seen = child.expect(self.keys)
  64         if seen == 2:
  65             lines = child.readlines()
  66             self.f.write(lines)
  67         if self.verbose:
  68             sys.stderr.write("<- " + child.before + "|\n")
  69         try:
  70             self.f.write(str(child.before) + str(child.after)+'\n')
  71         except:
  72             pass
  73         self.f.close()
  74         return child.before
  75
  76     def ssh(self, command):
  77
  78         return self.__exec("ssh -l %s %s \"%s\"" \
  79                                              % (self.user,self.host,command))
  80
  81     def scp(self, src, dst):
  82
  83         return self.__exec("scp %s %s@%s:%s" \
  84                                              % (src, session.user, session.host, dst))
  85
  86     def exists(self, file):
  87
  88         "Retrieve file permissions of specified remote file."
  89         seen = self.ssh("/bin/ls -ld %s" % file)
  90         if string.find(seen, "No such file") > -1:
  91             return None # File doesn't exist
  92         else:
  93             return seen.split()[0] # Return permission field of listing.
  94