FM / dns

/usr/lib/python3.9/site-packages/dns

Name	Size	Mode	Actions
dnssecalgs/	-	0755	rm
quic/	-	0755	rm
rdtypes/	-	0755	rm
__pycache__/	-	0755	rm
asyncbackend.py	2796	0644	edit dl rm
asyncquery.py	26850	0644	edit dl rm
asyncresolver.py	17852	0644	edit dl rm
dnssec.py	40693	0644	edit dl rm
dnssectypes.py	1799	0644	edit dl rm
e164.py	3978	0644	edit dl rm
edns.py	15263	0644	edit dl rm
entropy.py	4242	0644	edit dl rm
enum.py	3691	0644	edit dl rm
exception.py	5957	0644	edit dl rm
flags.py	2750	0644	edit dl rm
grange.py	2148	0644	edit dl rm
immutable.py	2017	0644	edit dl rm
inet.py	5772	0644	edit dl rm
ipv4.py	2552	0644	edit dl rm
ipv6.py	6600	0644	edit dl rm
message.py	65993	0644	edit dl rm
name.py	42672	0644	edit dl rm
namedict.py	4000	0644	edit dl rm
nameserver.py	9909	0644	edit dl rm
node.py	12663	0644	edit dl rm
opcode.py	2730	0644	edit dl rm
query.py	54832	0644	edit dl rm
rcode.py	4156	0644	edit dl rm
rdata.py	29456	0644	edit dl rm
rdataclass.py	2984	0644	edit dl rm
rdataset.py	16756	0644	edit dl rm
rdatatype.py	7339	0644	edit dl rm
renderer.py	11254	0644	edit dl rm
resolver.py	73552	0644	edit dl rm
reversename.py	3828	0644	edit dl rm
rrset.py	9170	0644	edit dl rm
serial.py	3606	0644	edit dl rm
set.py	9088	0644	edit dl rm
tokenizer.py	23583	0644	edit dl rm
transaction.py	22636	0644	edit dl rm
tsig.py	11413	0644	edit dl rm
tsigkeyring.py	2633	0644	edit dl rm
ttl.py	2979	0644	edit dl rm
update.py	12243	0644	edit dl rm
version.py	1926	0644	edit dl rm
versioned.py	11765	0644	edit dl rm
win32util.py	9107	0644	edit dl rm
wire.py	2830	0644	edit dl rm
xfr.py	13273	0644	edit dl rm
zone.py	52086	0644	edit dl rm
zonefile.py	27929	0644	edit dl rm
zonetypes.py	690	0644	edit dl rm
_asyncbackend.py	2360	0644	edit dl rm
_asyncio_backend.py	8971	0644	edit dl rm
_ddr.py	5247	0644	edit dl rm
_features.py	2384	0644	edit dl rm
_immutable_ctx.py	2459	0644	edit dl rm
__init__.py	1663	0644	edit dl rm

Edit: /usr/lib/python3.9/site-packages/dns/win32util.py (9107B)

import sys

import dns._features

if sys.platform == "win32":
    from typing import Any

import dns.name

_prefer_wmi = True

import winreg  # pylint: disable=import-error

# Keep pylint quiet on non-windows.
    try:
        WindowsError is None  # pylint: disable=used-before-assignment
    except KeyError:
        WindowsError = Exception

if dns._features.have("wmi"):
        import threading

import pythoncom  # pylint: disable=import-error
        import wmi  # pylint: disable=import-error

_have_wmi = True
    else:
        _have_wmi = False

def _config_domain(domain):
        # Sometimes DHCP servers add a '.' prefix to the default domain, and
        # Windows just stores such values in the registry (see #687).
        # Check for this and fix it.
        if domain.startswith("."):
            domain = domain[1:]
        return dns.name.from_text(domain)

class DnsInfo:
        def __init__(self):
            self.domain = None
            self.nameservers = []
            self.search = []

if _have_wmi:

class _WMIGetter(threading.Thread):
            def __init__(self):
                super().__init__()
                self.info = DnsInfo()

def run(self):
                pythoncom.CoInitialize()
                try:
                    system = wmi.WMI()
                    for interface in system.Win32_NetworkAdapterConfiguration():
                        if interface.IPEnabled and interface.DNSServerSearchOrder:
                            self.info.nameservers = list(interface.DNSServerSearchOrder)
                            if interface.DNSDomain:
                                self.info.domain = _config_domain(interface.DNSDomain)
                            if interface.DNSDomainSuffixSearchOrder:
                                self.info.search = [
                                    _config_domain(x)
                                    for x in interface.DNSDomainSuffixSearchOrder
                                ]
                            break
                finally:
                    pythoncom.CoUninitialize()

def get(self):
                # We always run in a separate thread to avoid any issues with
                # the COM threading model.
                self.start()
                self.join()
                return self.info

else:

class _WMIGetter:  # type: ignore
            pass

class _RegistryGetter:
        def __init__(self):
            self.info = DnsInfo()

def _determine_split_char(self, entry):
            #
            # The windows registry irritatingly changes the list element
            # delimiter in between ' ' and ',' (and vice-versa) in various
            # versions of windows.
            #
            if entry.find(" ") >= 0:
                split_char = " "
            elif entry.find(",") >= 0:
                split_char = ","
            else:
                # probably a singleton; treat as a space-separated list.
                split_char = " "
            return split_char

def _config_nameservers(self, nameservers):
            split_char = self._determine_split_char(nameservers)
            ns_list = nameservers.split(split_char)
            for ns in ns_list:
                if ns not in self.info.nameservers:
                    self.info.nameservers.append(ns)

def _config_search(self, search):
            split_char = self._determine_split_char(search)
            search_list = search.split(split_char)
            for s in search_list:
                s = _config_domain(s)
                if s not in self.info.search:
                    self.info.search.append(s)

def _config_fromkey(self, key, always_try_domain):
            try:
                servers, _ = winreg.QueryValueEx(key, "NameServer")
            except WindowsError:
                servers = None
            if servers:
                self._config_nameservers(servers)
            if servers or always_try_domain:
                try:
                    dom, _ = winreg.QueryValueEx(key, "Domain")
                    if dom:
                        self.info.domain = _config_domain(dom)
                except WindowsError:
                    pass
            else:
                try:
                    servers, _ = winreg.QueryValueEx(key, "DhcpNameServer")
                except WindowsError:
                    servers = None
                if servers:
                    self._config_nameservers(servers)
                    try:
                        dom, _ = winreg.QueryValueEx(key, "DhcpDomain")
                        if dom:
                            self.info.domain = _config_domain(dom)
                    except WindowsError:
                        pass
            try:
                search, _ = winreg.QueryValueEx(key, "SearchList")
            except WindowsError:
                search = None
            if search is None:
                try:
                    search, _ = winreg.QueryValueEx(key, "DhcpSearchList")
                except WindowsError:
                    search = None
            if search:
                self._config_search(search)

def _is_nic_enabled(self, lm, guid):
            # Look in the Windows Registry to determine whether the network
            # interface corresponding to the given guid is enabled.
            #
            # (Code contributed by Paul Marks, thanks!)
            #
            try:
                # This hard-coded location seems to be consistent, at least
                # from Windows 2000 through Vista.
                connection_key = winreg.OpenKey(
                    lm,
                    r"SYSTEM\CurrentControlSet\Control\Network"
                    r"\{4D36E972-E325-11CE-BFC1-08002BE10318}"
                    r"\%s\Connection" % guid,
                )

try:
                    # The PnpInstanceID points to a key inside Enum
                    (pnp_id, ttype) = winreg.QueryValueEx(
                        connection_key, "PnpInstanceID"
                    )

if ttype != winreg.REG_SZ:
                        raise ValueError  # pragma: no cover

device_key = winreg.OpenKey(
                        lm, r"SYSTEM\CurrentControlSet\Enum\%s" % pnp_id
                    )

try:
                        # Get ConfigFlags for this device
                        (flags, ttype) = winreg.QueryValueEx(device_key, "ConfigFlags")

if ttype != winreg.REG_DWORD:
                            raise ValueError  # pragma: no cover

# Based on experimentation, bit 0x1 indicates that the
                        # device is disabled.
                        #
                        # XXXRTH I suspect we really want to & with 0x03 so
                        # that CONFIGFLAGS_REMOVED devices are also ignored,
                        # but we're shifting to WMI as ConfigFlags is not
                        # supposed to be used.
                        return not flags & 0x1

finally:
                        device_key.Close()
                finally:
                    connection_key.Close()
            except Exception:  # pragma: no cover
                return False

def get(self):
            """Extract resolver configuration from the Windows registry."""

lm = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
            try:
                tcp_params = winreg.OpenKey(
                    lm, r"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters"
                )
                try:
                    self._config_fromkey(tcp_params, True)
                finally:
                    tcp_params.Close()
                interfaces = winreg.OpenKey(
                    lm,
                    r"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces",
                )
                try:
                    i = 0
                    while True:
                        try:
                            guid = winreg.EnumKey(interfaces, i)
                            i += 1
                            key = winreg.OpenKey(interfaces, guid)
                            try:
                                if not self._is_nic_enabled(lm, guid):
                                    continue
                                self._config_fromkey(key, False)
                            finally:
                                key.Close()
                        except EnvironmentError:
                            break
                finally:
                    interfaces.Close()
            finally:
                lm.Close()
            return self.info

_getter_class: Any
    if _have_wmi and _prefer_wmi:
        _getter_class = _WMIGetter
    else:
        _getter_class = _RegistryGetter

def get_dns_info():
        """Extract resolver configuration."""
        getter = _getter_class()
        return getter.get()

cmd: