completed module: validip.py

[Skaperen]

this module is also usable as a command to check if an IP address is valid.  given just one IP address, it is silent but sets the exit code to 1 if the address is invalid (0 if valid).

there are functions validip(), validipv4(), and validipv6(). these return boolean values.

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function, unicode_literals
"""
file          validip.py
purpose       Check if IP addresses (in strings) are valid IPv4 or IPv6
email         10054452614123394844460370234029112340408691

The intent is that this command works correctly under both Python 2 and
Python 3.  Please report failures or code improvement to the author.
"""

__license__ = """
Copyright (C) 2016, by Phil D. Howard - all other rights reserved

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.

The author may be contacted by decoding the number
10054452614123394844460370234029112340408691
"""

from sys import argv, stderr, stdout, version

from socket import inet_pton, AF_INET, AF_INET6

def validipv4(addr):
    """validipv4"""
    try:
        inet_pton(AF_INET,addr)
        r = True
    except (OSError,IOError):
        r = False
    return r


def validipv6(addr):
    """validipv6"""
    try:
        inet_pton(AF_INET6,addr)
        r = True
    except (OSError,IOError):
        r = False
    return r


def validip(addr):
    if validipv4(addr):
        return True
    if validipv6(addr):
        return True
    return False


def testips(addrlist):
    if len(addrlist)==1:
        return 0 if validip(addrlist[0]) else 1
    r = 0
    for addr in addrlist:
        e = 0
        if validipv4(addr):
            print('IP address {} is valid IPv4'.format(repr(addr)))
        else:
            print('IP address {} is NOT valid IPv4'.format(repr(addr)))
            e += 4
        if validipv6(addr):
            print('IP address {} is valid IPv6'.format(repr(addr)))
        else:
            print('IP address {} is NOT valid IPv6'.format(repr(addr)))
            e += 6
        if e == 10:
            r = 1
    return r


def main( args ):
    """main"""
    return testips( args[1:] )



if __name__ == '__main__':
    try:
        result = main( argv )
    except KeyboardInterrupt:
        result = 99
        print( '' )
    except IOError:
        result = 98
    stdout.flush()
    try:
        exit( int( result ) )
    except ValueError:
        print( str( result ), file=stderr )
        exit( 1 )
    except TypeError:
        if result == None:
            exit( 0 )
        exit( 255 )

# EOF