codekingpro/portable-devtools

1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license2 3# Copyright (C) 2006-2017 Nominum, Inc.4#5# Permission to use, copy, modify, and distribute this software and its6# documentation for any purpose with or without fee is hereby granted,7# provided that the above copyright notice and this permission notice8# appear in all copies.9#10# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT16# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.17 18"""DNS Reverse Map Names."""19 20import binascii21 22import dns.ipv423import dns.ipv624import dns.name25 26ipv4_reverse_domain = dns.name.from_text("in-addr.arpa.")27ipv6_reverse_domain = dns.name.from_text("ip6.arpa.")28 29 30def from_address(31    text: str,32    v4_origin: dns.name.Name = ipv4_reverse_domain,33    v6_origin: dns.name.Name = ipv6_reverse_domain,34) -> dns.name.Name:35    """Convert an IPv4 or IPv6 address in textual form into a Name object whose36    value is the reverse-map domain name of the address.37 38    *text*, a ``str``, is an IPv4 or IPv6 address in textual form39    (e.g. '127.0.0.1', '::1')40 41    *v4_origin*, a ``dns.name.Name`` to append to the labels corresponding to42    the address if the address is an IPv4 address, instead of the default43    (in-addr.arpa.)44 45    *v6_origin*, a ``dns.name.Name`` to append to the labels corresponding to46    the address if the address is an IPv6 address, instead of the default47    (ip6.arpa.)48 49    Raises ``dns.exception.SyntaxError`` if the address is badly formed.50 51    Returns a ``dns.name.Name``.52    """53 54    try:55        v6 = dns.ipv6.inet_aton(text)56        if dns.ipv6.is_mapped(v6):57            parts = ["%d" % byte for byte in v6[12:]]58            origin = v4_origin59        else:60            parts = [x for x in str(binascii.hexlify(v6).decode())]61            origin = v6_origin62    except Exception:63        parts = ["%d" % byte for byte in dns.ipv4.inet_aton(text)]64        origin = v4_origin65    return dns.name.from_text(".".join(reversed(parts)), origin=origin)66 67 68def to_address(69    name: dns.name.Name,70    v4_origin: dns.name.Name = ipv4_reverse_domain,71    v6_origin: dns.name.Name = ipv6_reverse_domain,72) -> str:73    """Convert a reverse map domain name into textual address form.74 75    *name*, a ``dns.name.Name``, an IPv4 or IPv6 address in reverse-map name76    form.77 78    *v4_origin*, a ``dns.name.Name`` representing the top-level domain for79    IPv4 addresses, instead of the default (in-addr.arpa.)80 81    *v6_origin*, a ``dns.name.Name`` representing the top-level domain for82    IPv4 addresses, instead of the default (ip6.arpa.)83 84    Raises ``dns.exception.SyntaxError`` if the name does not have a85    reverse-map form.86 87    Returns a ``str``.88    """89 90    if name.is_subdomain(v4_origin):91        name = name.relativize(v4_origin)92        text = b".".join(reversed(name.labels))93        # run through inet_ntoa() to check syntax and make pretty.94        return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))95    elif name.is_subdomain(v6_origin):96        name = name.relativize(v6_origin)97        labels = list(reversed(name.labels))98        parts = []99        for i in range(0, len(labels), 4):100            parts.append(b"".join(labels[i : i + 4]))101        text = b":".join(parts)102        # run through inet_ntoa() to check syntax and make pretty.103        return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))104    else:105        raise dns.exception.SyntaxError("unknown reverse-map address family")106