#!/usr/bin/env python

"""
 Eric S. Raymond

 Greatly modified by Nigel W. Moriarty
 April 2003

PEXPECT LICENSE

    This license is approved by the OSI and FSF as GPL-compatible.
        http://opensource.org/licenses/isc-license.txt

    Copyright (c) 2012, Noah Spurrier <noah@noah.org>
    PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
    PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
    COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""

from pexpect import *
import os, sys
import getpass
import time

class ssh_session:

    "Session with extra state including the password to be used."

    def __init__(self, user, host, password=None, verbose=0):

        self.user = user
        self.host = host
        self.verbose = verbose
        self.password = password
        self.keys = [
            'authenticity',
            'assword:',
            '@@@@@@@@@@@@',
            'Command not found.',
            EOF,
            ]

        self.f = open('ssh.out','w')

    def __repr__(self):

        outl = 'class :'+self.__class__.__name__
        for attr in self.__dict__:
            if attr == 'password':
                outl += '\n\t'+attr+' : '+'*'*len(self.password)
            else:
                outl += '\n\t'+attr+' : '+str(getattr(self, attr))
        return outl

    def __exec(self, command):

        "Execute a command on the remote host.    Return the output."
        child = spawn(command,
                                    #timeout=10,
                                    )
        if self.verbose:
            sys.stderr.write("-> " + command + "\n")
        seen = child.expect(self.keys)
        self.f.write(str(child.before) + str(child.after)+'\n')
        if seen == 0:
            child.sendline('yes')
            seen = child.expect(self.keys)
        if seen == 1:
            if not self.password:
                self.password = getpass.getpass('Remote password: ')
            child.sendline(self.password)
            child.readline()
            time.sleep(5)
            # Added to allow the background running of remote process
            if not child.isalive():
                seen = child.expect(self.keys)
        if seen == 2:
            lines = child.readlines()
            self.f.write(lines)
        if self.verbose:
            sys.stderr.write("<- " + child.before + "|\n")
        try:
            self.f.write(str(child.before) + str(child.after)+'\n')
        except:
            pass
        self.f.close()
        return child.before

    def ssh(self, command):

        return self.__exec("ssh -l %s %s \"%s\"" \
                                             % (self.user,self.host,command))

    def scp(self, src, dst):

        return self.__exec("scp %s %s@%s:%s" \
                                             % (src, session.user, session.host, dst))

    def exists(self, file):

        "Retrieve file permissions of specified remote file."
        seen = self.ssh("/bin/ls -ld %s" % file)
        if string.find(seen, "No such file") > -1:
            return None # File doesn't exist
        else:
            return seen.split()[0] # Return permission field of listing.