Updated script that can be controled by Nodejs web app

lib/python3.13/site-packages/dns/reversename.py

@@ -0,0 +1,105 @@
+# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
+
+# Copyright (C) 2006-2017 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation 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 NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM 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.
+
+"""DNS Reverse Map Names."""
+
+import binascii
+
+import dns.ipv4
+import dns.ipv6
+import dns.name
+
+ipv4_reverse_domain = dns.name.from_text("in-addr.arpa.")
+ipv6_reverse_domain = dns.name.from_text("ip6.arpa.")
+
+
+def from_address(
+    text: str,
+    v4_origin: dns.name.Name = ipv4_reverse_domain,
+    v6_origin: dns.name.Name = ipv6_reverse_domain,
+) -> dns.name.Name:
+    """Convert an IPv4 or IPv6 address in textual form into a Name object whose
+    value is the reverse-map domain name of the address.
+
+    *text*, a ``str``, is an IPv4 or IPv6 address in textual form
+    (e.g. '127.0.0.1', '::1')
+
+    *v4_origin*, a ``dns.name.Name`` to append to the labels corresponding to
+    the address if the address is an IPv4 address, instead of the default
+    (in-addr.arpa.)
+
+    *v6_origin*, a ``dns.name.Name`` to append to the labels corresponding to
+    the address if the address is an IPv6 address, instead of the default
+    (ip6.arpa.)
+
+    Raises ``dns.exception.SyntaxError`` if the address is badly formed.
+
+    Returns a ``dns.name.Name``.
+    """
+
+    try:
+        v6 = dns.ipv6.inet_aton(text)
+        if dns.ipv6.is_mapped(v6):
+            parts = ["%d" % byte for byte in v6[12:]]
+            origin = v4_origin
+        else:
+            parts = [x for x in str(binascii.hexlify(v6).decode())]
+            origin = v6_origin
+    except Exception:
+        parts = ["%d" % byte for byte in dns.ipv4.inet_aton(text)]
+        origin = v4_origin
+    return dns.name.from_text(".".join(reversed(parts)), origin=origin)
+
+
+def to_address(
+    name: dns.name.Name,
+    v4_origin: dns.name.Name = ipv4_reverse_domain,
+    v6_origin: dns.name.Name = ipv6_reverse_domain,
+) -> str:
+    """Convert a reverse map domain name into textual address form.
+
+    *name*, a ``dns.name.Name``, an IPv4 or IPv6 address in reverse-map name
+    form.
+
+    *v4_origin*, a ``dns.name.Name`` representing the top-level domain for
+    IPv4 addresses, instead of the default (in-addr.arpa.)
+
+    *v6_origin*, a ``dns.name.Name`` representing the top-level domain for
+    IPv4 addresses, instead of the default (ip6.arpa.)
+
+    Raises ``dns.exception.SyntaxError`` if the name does not have a
+    reverse-map form.
+
+    Returns a ``str``.
+    """
+
+    if name.is_subdomain(v4_origin):
+        name = name.relativize(v4_origin)
+        text = b".".join(reversed(name.labels))
+        # run through inet_ntoa() to check syntax and make pretty.
+        return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))
+    elif name.is_subdomain(v6_origin):
+        name = name.relativize(v6_origin)
+        labels = list(reversed(name.labels))
+        parts = []
+        for i in range(0, len(labels), 4):
+            parts.append(b"".join(labels[i : i + 4]))
+        text = b":".join(parts)
+        # run through inet_ntoa() to check syntax and make pretty.
+        return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))
+    else:
+        raise dns.exception.SyntaxError("unknown reverse-map address family")