Updated script that can be controled by Nodejs web app

lib/python3.13/site-packages/dns/ipv4.py

@@ -0,0 +1,77 @@
+# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
+
+# Copyright (C) 2003-2017 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.
+
+"""IPv4 helper functions."""
+
+import struct
+from typing import Union
+
+import dns.exception
+
+
+def inet_ntoa(address: bytes) -> str:
+    """Convert an IPv4 address in binary form to text form.
+
+    *address*, a ``bytes``, the IPv4 address in binary form.
+
+    Returns a ``str``.
+    """
+
+    if len(address) != 4:
+        raise dns.exception.SyntaxError
+    return "%u.%u.%u.%u" % (address[0], address[1], address[2], address[3])
+
+
+def inet_aton(text: Union[str, bytes]) -> bytes:
+    """Convert an IPv4 address in text form to binary form.
+
+    *text*, a ``str`` or ``bytes``, the IPv4 address in textual form.
+
+    Returns a ``bytes``.
+    """
+
+    if not isinstance(text, bytes):
+        btext = text.encode()
+    else:
+        btext = text
+    parts = btext.split(b".")
+    if len(parts) != 4:
+        raise dns.exception.SyntaxError
+    for part in parts:
+        if not part.isdigit():
+            raise dns.exception.SyntaxError
+        if len(part) > 1 and part[0] == ord("0"):
+            # No leading zeros
+            raise dns.exception.SyntaxError
+    try:
+        b = [int(part) for part in parts]
+        return struct.pack("BBBB", *b)
+    except Exception:
+        raise dns.exception.SyntaxError
+
+
+def canonicalize(text: Union[str, bytes]) -> str:
+    """Verify that *address* is a valid text form IPv4 address and return its
+    canonical text form.
+
+    *text*, a ``str`` or ``bytes``, the IPv4 address in textual form.
+
+    Raises ``dns.exception.SyntaxError`` if the text is not valid.
+    """
+    # Note that inet_aton() only accepts canonial form, but we still run through
+    # inet_ntoa() to ensure the output is a str.
+    return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))