#!/usr/bin/env python
# Non-Interactive ssh Connection
# $Id: tsshbatch.py,v 1.111 2011/02/11 18:25:34 tundra Exp $

#####
# Suppress Deprecation Warnings until Paramiko catches up
# to latest Python modules
#####

import warnings
warnings.filterwarnings("ignore", "", DeprecationWarning)


#####
# Imports
#####

import getpass
import paramiko
import socket
import sys


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# Constants And Literals
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FAILURE     = "FAILURE"
INDENTWIDTH = 8
PADWIDTH    = 30
SEPARATOR   = " --->  "
SUCCESS     = "SUCCESS"
TRAILER     = ": "
USAGE       = "Usage:  tsshbatch.py serverlistfile command"

#####
# Error Messages
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eBADFILE      =  "Cannot open '%s'!"
eNOCONNECT    =  "Cannot Connect! (Name/Address Bad?  Destination Unreachable?)"
eNOLOGIN      =  "Cannot Login! (Login/Password Bad?)"


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# Prompts
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pPASS = "Password: "
pUSER = "Username: "


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# Print Message(s) To stdout
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def PrintStdout(msg, TERMINATOR="\n"):
    sys.stdout.write(msg + TERMINATOR)

# End of 'PrintStdout()'


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# Display An Error Message And Exit
#####

def ErrorExit(msg):

    PrintStdout(msg)
    sys.exit()

# End Of 'ErrorExit()'


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# Process A Command On A Host
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def HostCommand(host, user, pw, command):

    ssh = paramiko.SSHClient()

    # Connect and run the command, reporting results as we go
    
    try: 
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(host, username=user, password=pw)
        stdin, stdout, stderr = ssh.exec_command(command)
        PrintReport([host, SUCCESS] + stdout.readlines() + stderr.readlines())
        
    # Catch authentication problems explicitly
        
    except paramiko.AuthenticationException:
        PrintReport([host, FAILURE, eNOLOGIN])
    
    # Everything else is some kind of connection problem

    except:
        PrintReport([host, FAILURE, eNOCONNECT])

    ssh.close()

# End of 'HostCommand()'

    
#####
# Print Report
#####

# Expects input as [host, success/failure message, result1, result2, ...]

def PrintReport(results):

    PrintStdout(SEPARATOR + results[0] +
                TRAILER +
                (PADWIDTH - len(results[0])) * " " +
                results[1])

    for r in results[2:]:                             # Command Results
        PrintStdout(INDENTWIDTH * " " + r.strip())

# End of 'PrintReport()'


#####
# Program Entry Point
#####

# Make sure we have sufficient command line args

if len(sys.argv[1:]) < 2:
    ErrorExit(USAGE)

# Get the list of hosts

try:
    f = open(sys.argv[1])
    hosts = f.readlines()
    f.close()

except:
    ErrorExit(eBADFILE % sys.argv[1])

# Create the command

cmd = " ".join(sys.argv[2:])
    
# Get user name & password

uname = raw_input(pUSER)
pword  = getpass.getpass(pPASS)


# Iterate over the list of hosts, executing the command

for host in hosts:
    host = host.strip()
    if host:
     HostCommand(host, uname, pword, cmd)