✏️ Editing: inet.py Read Only

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# Copyright (C) 2003-2017 Nominum, Inc.
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"""Generic Internet address helper functions."""

import socket
from typing import Any, Optional, Tuple

import dns.ipv4
import dns.ipv6

# We assume that AF_INET and AF_INET6 are always defined.  We keep
# these here for the benefit of any old code (unlikely though that
# is!).
AF_INET = socket.AF_INET
AF_INET6 = socket.AF_INET6

def inet_pton(family: int, text: str) -> bytes:
    """Convert the textual form of a network address into its binary form.

*family* is an ``int``, the address family.

*text* is a ``str``, the textual address.

Raises ``NotImplementedError`` if the address family specified is not
    implemented.

Returns a ``bytes``.
    """

if family == AF_INET:
        return dns.ipv4.inet_aton(text)
    elif family == AF_INET6:
        return dns.ipv6.inet_aton(text, True)
    else:
        raise NotImplementedError

def inet_ntop(family: int, address: bytes) -> str:
    """Convert the binary form of a network address into its textual form.

*family* is an ``int``, the address family.

*address* is a ``bytes``, the network address in binary form.

Raises ``NotImplementedError`` if the address family specified is not
    implemented.

Returns a ``str``.
    """

if family == AF_INET:
        return dns.ipv4.inet_ntoa(address)
    elif family == AF_INET6:
        return dns.ipv6.inet_ntoa(address)
    else:
        raise NotImplementedError

def af_for_address(text: str) -> int:
    """Determine the address family of a textual-form network address.

*text*, a ``str``, the textual address.

Raises ``ValueError`` if the address family cannot be determined
    from the input.

Returns an ``int``.
    """

try:
        dns.ipv4.inet_aton(text)
        return AF_INET
    except Exception:
        try:
            dns.ipv6.inet_aton(text, True)
            return AF_INET6
        except Exception:
            raise ValueError

def is_multicast(text: str) -> bool:
    """Is the textual-form network address a multicast address?

*text*, a ``str``, the textual address.

Raises ``ValueError`` if the address family cannot be determined
    from the input.

Returns a ``bool``.
    """

try:
        first = dns.ipv4.inet_aton(text)[0]
        return first >= 224 and first <= 239
    except Exception:
        try:
            first = dns.ipv6.inet_aton(text, True)[0]
            return first == 255
        except Exception:
            raise ValueError

def is_address(text: str) -> bool:
    """Is the specified string an IPv4 or IPv6 address?

*text*, a ``str``, the textual address.

Returns a ``bool``.
    """

try:
        dns.ipv4.inet_aton(text)
        return True
    except Exception:
        try:
            dns.ipv6.inet_aton(text, True)
            return True
        except Exception:
            return False

def low_level_address_tuple(
    high_tuple: Tuple[str, int], af: Optional[int] = None
) -> Any:
    """Given a "high-level" address tuple, i.e.
    an (address, port) return the appropriate "low-level" address tuple
    suitable for use in socket calls.

If an *af* other than ``None`` is provided, it is assumed the
    address in the high-level tuple is valid and has that af.  If af
    is ``None``, then af_for_address will be called.
    """
    address, port = high_tuple
    if af is None:
        af = af_for_address(address)
    if af == AF_INET:
        return (address, port)
    elif af == AF_INET6:
        i = address.find("%")
        if i < 0:
            # no scope, shortcut!
            return (address, port, 0, 0)
        # try to avoid getaddrinfo()
        addrpart = address[:i]
        scope = address[i + 1 :]
        if scope.isdigit():
            return (addrpart, port, 0, int(scope))
        try:
            return (addrpart, port, 0, socket.if_nametoindex(scope))
        except AttributeError:  # pragma: no cover  (we can't really test this)
            ai_flags = socket.AI_NUMERICHOST
            ((*_, tup), *_) = socket.getaddrinfo(address, port, flags=ai_flags)
            return tup
    else:
        raise NotImplementedError(f"unknown address family {af}")

def any_for_af(af):
    """Return the 'any' address for the specified address family."""
    if af == socket.AF_INET:
        return "0.0.0.0"
    elif af == socket.AF_INET6:
        return "::"
    raise NotImplementedError(f"unknown address family {af}")

def canonicalize(text: str) -> str:
    """Verify that *address* is a valid text form IPv4 or IPv6 address and return its
    canonical text form.  IPv6 addresses with scopes are rejected.

*text*, a ``str``, the address in textual form.

Raises ``ValueError`` if the text is not valid.
    """
    try:
        return dns.ipv6.canonicalize(text)
    except Exception:
        try:
            return dns.ipv4.canonicalize(text)
        except Exception:
            raise ValueError

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