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|
# frozen_string_literal: false
=begin
= Win32 DNS and DHCP I/F
=end
require 'win32/registry'
module Win32
module Resolv
API = Registry::API
Error = Registry::Error
def self.get_hosts_path
path = get_hosts_dir
path = File.expand_path('hosts', path)
File.exist?(path) ? path : nil
end
def self.get_resolv_info
search, nameserver = get_info
if search.empty?
search = nil
else
search.delete("")
search.uniq!
end
if nameserver.empty?
nameserver = nil
else
nameserver.delete("")
nameserver.delete("0.0.0.0")
nameserver.uniq!
end
[ search, nameserver ]
end
end
end
# JRuby specific use FFI instead of loading native .so
module Win32
module Internal
NO_ERROR, ERROR_BUFFER_OVERFLOW = 0, 111
require 'ffi'
class IP_ADDRESS_STRING < FFI::Struct
layout :string, [:uint8, 16]
end
class IP_ADDR_STRING < FFI::Struct
layout :next, IP_ADDR_STRING.ptr,
:ip_address, IP_ADDRESS_STRING,
:ip_mask_string, IP_ADDRESS_STRING,
:context, :int
end
class FIXED_INFO < FFI::Struct
layout :host_name, [:uint8, 128 + 4],
:domain_name, [:uint8, 128 + 4],
:current_dns_server, IP_ADDR_STRING.ptr,
:dns_server_list, IP_ADDR_STRING,
:node_type, :uint,
:scope_id, [:uint8, 256 + 4],
:enable_routine, :uint,
:enable_proxy, :uint,
:enable_dns, :uint
end
class IntPtr < FFI::Struct
layout :value, :int
end
module Iphlpapi
extend FFI::Library
ffi_lib 'Iphlpapi'
ffi_convention :stdcall
attach_function :get_network_params, :GetNetworkParams, [:pointer, IntPtr], :int
end
end
end
module Win32
module Resolv
def self.get_dns_server_list
size = Win32::Internal::IntPtr.new
ret = Win32::Internal::Iphlpapi.get_network_params nil, size
# We get buffer overflow because first arg to get_network_params is nil.
if ret != Win32::Internal::NO_ERROR && ret != Win32::Internal::ERROR_BUFFER_OVERFLOW
raise Win32::Resolv::Error
end
fixed_info = FFI::MemoryPointer.new size[:value]
ret = Win32::Internal::Iphlpapi.get_network_params fixed_info, size
raise Win32::Resolv::Error if ret != Win32::Internal::NO_ERROR
fixed_info = Win32::Internal::FIXED_INFO.new fixed_info
addr = fixed_info[:dns_server_list]
addresses = []
while !addr.null? do # test condition on machines with no DNS entries at all.
addresses << addr[:ip_address][:string].to_s
break if addr[:next].null?
addr = addr[:next]
end
addresses
end
end
end
if [nil].pack("p").size <= 4 # 32bit env
begin
f = Fiddle
osid = f::Handle.new["rb_w32_osid"]
rescue f::DLError # not ix86, cannot be Windows 9x
else
if f::Function.new(osid, [], f::TYPE_INT).call < 2 # VER_PLATFORM_WIN32_NT
require_relative 'resolv9x'
return
end
end
end
module Win32
#====================================================================
# Windows NT
#====================================================================
module Resolv
module SZ
refine Registry do
# ad hoc workaround for broken registry
def read_s(key)
type, str = read(key)
unless type == Registry::REG_SZ
warn "Broken registry, #{name}\\#{key} was #{Registry.type2name(type)}, ignored"
return String.new
end
str
end
end
end
using SZ
TCPIP_NT = 'SYSTEM\CurrentControlSet\Services\Tcpip\Parameters'
class << self
private
def get_hosts_dir
Registry::HKEY_LOCAL_MACHINE.open(TCPIP_NT) do |reg|
reg.read_s_expand('DataBasePath')
end
end
def get_info
search = nil
nameserver = get_dns_server_list
Registry::HKEY_LOCAL_MACHINE.open(TCPIP_NT) do |reg|
begin
slist = reg.read_s('SearchList')
search = slist.split(/,\s*/) unless slist.empty?
rescue Registry::Error
end
if add_search = search.nil?
search = []
begin
nvdom = reg.read_s('NV Domain')
unless nvdom.empty?
@search = [ nvdom ]
if reg.read_i('UseDomainNameDevolution') != 0
if /^\w+\./ =~ nvdom
devo = $'
end
end
end
rescue Registry::Error
end
end
reg.open('Interfaces') do |h|
h.each_key do |iface, |
h.open(iface) do |regif|
next unless ns = %w[NameServer DhcpNameServer].find do |key|
begin
ns = regif.read_s(key)
rescue Registry::Error
else
break ns.split(/[,\s]\s*/) unless ns.empty?
end
end
next if (nameserver & ns).empty?
if add_search
begin
[ 'Domain', 'DhcpDomain' ].each do |key|
dom = regif.read_s(key)
unless dom.empty?
search.concat(dom.split(/,\s*/))
break
end
end
rescue Registry::Error
end
end
end
end
end
search << devo if add_search and devo
end
[ search.uniq, nameserver.uniq ]
end
end
end
end
|
