55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
#!/usr/bin/env python3
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"""Get 6to4 address from IPv4 address."""
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import argparse
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def parse_args(): # pragma: no cover
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parser = argparse.ArgumentParser(description='Get 6to4 address from IPv4 address.')
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parser.add_argument('-a', '--address', dest='address', action='store', help='IPv4 address', required=True)
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args = parser.parse_args()
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return args
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def ipv4_to_ipv6(ipv4):
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ipv4Hex = ''
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ipv6Hextet1 = '2002'
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ipv6Hextet2 = ''
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ipv6Hextet3 = ''
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# Split input to octets
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ipv4 = ipv4.split('.',4)
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# Convert IPv4 address to hex string
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for octet in ipv4:
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if len(hex(int(octet))[2:])>1:
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ipv4Hex += hex(int(octet))[2:]
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else:
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ipv4Hex += '0'
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ipv4Hex += hex(int(octet))[2:]
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# Split into hextets
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for i in range(4):
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ipv6Hextet2 += (ipv4Hex[i])
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for i in range(4,8):
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ipv6Hextet3 += (ipv4Hex[i])
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# Convert to dec and back to remove leading zeros
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ipv6Hextet2 = hex(int(ipv6Hextet2,16))[2:]
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ipv6Hextet3 = hex(int(ipv6Hextet3,16))[2:]
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# Form 6to4 address
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output_6to4 = f"{ipv6Hextet1}:{ipv6Hextet2}:{ipv6Hextet3}::/128"
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return output_6to4
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def main(): # pragma: no cover
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ipv4 = parse_args().address
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output = ipv4_to_ipv6(ipv4)
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print(output)
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if __name__ == '__main__':
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main() # pragma: no cover
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