summaryrefslogtreecommitdiff
path: root/ext/dl/win32/lib/win32/resolv.rb
blob: cefec61caa866786a09eb4391777d73bf7ff5aea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
=begin
= Win32 DNS and DHCP I/F

=end

require "dl/import"
require 'win32/registry'

module Win32
  module Resolv
    API = Registry::API
    
    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

module Kernel32
  extend DL::Importer
  dlload "kernel32"
end
getv = Kernel32.extern "int GetVersionExA(void *)", :stdcall
info = [ 148, 0, 0, 0, 0 ].pack('V5') + "\0" * 128
getv.call(info)
if info.unpack('V5')[4] == 2  # VER_PLATFORM_WIN32_NT
#====================================================================
# Windows NT
#====================================================================
  module_eval <<-'__EOS__', __FILE__, __LINE__+1
    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 = []
        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\d]+\./ =~ nvdom
                    devo = $'
                  end
                end
              end
            rescue Registry::Error
            end
          end
          
          reg.open('Interfaces') do |reg|
            reg.each_key do |iface,|
              reg.open(iface) do |regif|
                begin
                  [ 'NameServer', 'DhcpNameServer' ].each do |key|
                    begin
                      ns = regif.read_s(key)
                    rescue
                    else
                      unless ns.empty?
                        nameserver.concat(ns.split(/[,\s]\s*/))
                        break
                      end
                    end
                  end
                rescue Registry::Error
                end
                
                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
  __EOS__
else
#====================================================================
# Windows 9x
#====================================================================
  module_eval <<-'__EOS__', __FILE__, __LINE__+1
    TCPIP_9X = 'SYSTEM\CurrentControlSet\Services\VxD\MSTCP'
    DHCP_9X = 'SYSTEM\CurrentControlSet\Services\VxD\DHCP'
    WINDOWS = 'Software\Microsoft\Windows\CurrentVersion'
    
    class << self
   #   private
      
      def get_hosts_dir
        Registry::HKEY_LOCAL_MACHINE.open(WINDOWS) do |reg|
          reg.read_s_expand('SystemRoot')
        end
      end
      
      def get_info
        search = []
        nameserver = []
        begin
          Registry::HKEY_LOCAL_MACHINE.open(TCPIP_9X) do |reg|
            if reg.read_s("EnableDNS") == "1"
              domain = reg.read_s("Domain")
              ns = reg.read_s("NameServer")
              slist = reg.read_s("SearchList")
              search << domain unless domain.empty?
              search.concat(slist.split(/,\s*/))
              nameserver.concat(ns.split(/[,\s]\s*/))
            end
          end
        rescue Registry::Error
        end
        
        dhcpinfo = get_dhcpinfo
        search.concat(dhcpinfo[0])
        nameserver.concat(dhcpinfo[1])
        [ search, nameserver ]
      end
      
      def get_dhcpinfo
        macaddrs = {}
        ipaddrs = {}
        WsControl.get_iflist.each do |index, macaddr, *ipaddr|
          macaddrs[macaddr] = 1
          ipaddr.each { |ipaddr| ipaddrs[ipaddr] = 1 }
        end
        iflist = [ macaddrs, ipaddrs ]
        
        search = []
        nameserver = []
        version = -1
        Registry::HKEY_LOCAL_MACHINE.open(DHCP_9X) do |reg|
          begin
            version = API.unpackdw(reg.read_bin("Version"))
          rescue Registry::Error
          end
          
          reg.each_key do |key,|
            catch(:not_used) do
              reg.open(key) do |regdi|
                dom, ns = get_dhcpinfo_key(version, regdi, iflist)
                search << dom if dom
                nameserver.concat(ns) if ns
              end
            end
          end
        end
        [ search, nameserver ]
      end
      
      def get_dhcpinfo_95(reg)
        dhcp = reg.read_bin("DhcpInfo")
        [
          API.unpackdw(dhcp[4..7]),
          API.unpackdw(dhcp[8..11]),
          1,
          dhcp[45..50],
          reg.read_bin("OptionInfo"),
        ]
      end
      
      def get_dhcpinfo_98(reg)
        [
          API.unpackdw(reg.read_bin("DhcpIPAddress")),
          API.unpackdw(reg.read_bin("DhcpSubnetMask")),
          API.unpackdw(reg.read_bin("HardwareType")),
          reg.read_bin("HardwareAddress"),
          reg.read_bin("OptionInfo"),
        ]
      end
      
      def get_dhcpinfo_key(version, reg, iflist)
        info = case version
               when 1
                 get_dhcpinfo_95(reg)
               when 2
                 get_dhcpinfo_98(reg)
               else
                 begin
                   get_dhcpinfo_98(reg)
                 rescue Registry::Error
                   get_dhcpinfo_95(reg)
                 end
               end
        ipaddr, netmask, hwtype, macaddr, opt = info
        throw :not_used unless
          ipaddr and ipaddr != 0 and
          netmask and netmask != 0 and
          macaddr and macaddr.size == 6 and
          hwtype == 1 and
          iflist[0][macaddr] and iflist[1][ipaddr]
        
        size = opt.size
        idx = 0
        while idx <= size
          opttype = opt[idx]
          optsize = opt[idx + 1]
          optval  = opt[idx + 2, optsize]
          case opttype
          when 0xFF    ## term
            break
          when 0x0F    ## domain
            domain = optval.chomp("\0")
          when 0x06    ## dns
            nameserver = optval.scan(/..../).collect { |addr|
              "%d.%d.%d.%d" % addr.unpack('C4')
            }
          end
          idx += optsize + 2
        end
        [ domain, nameserver ]
      rescue Registry::Error
        throw :not_used
      end
    end
    
    module WsControl
      module WSock32
        extend DL::Importer
        dlload "wsock32.dll"
      end
      WsControl = WSock32.extern "int WsControl(int, int, void *, void *, void *, void *", :stdcall
      WSAGetLastError = WSock32.extern "int WSAGetLastError(void)", :stdcall
      
      MAX_TDI_ENTITIES = 512
      IPPROTO_TCP = 6
      WSCTL_TCP_QUERY_INFORMATION = 0
      INFO_CLASS_GENERIC = 0x100
      INFO_CLASS_PROTOCOL = 0x200
      INFO_TYPE_PROVIDER = 0x100
      ENTITY_LIST_ID = 0
      GENERIC_ENTITY = 0
      CL_NL_ENTITY = 0x301
      IF_ENTITY = 0x200
      ENTITY_TYPE_ID = 1
      CL_NL_IP = 0x303
      IF_MIB = 0x202
      IF_MIB_STATS_ID = 1
      IP_MIB_ADDRTABLE_ENTRY_ID = 0x102
      
      def self.wsctl(tei_entity, tei_instance,
                     toi_class, toi_type, toi_id,
                     buffsize)
        reqinfo = [
                  ## TDIEntityID
                    tei_entity, tei_instance,
                  ## TDIObjectID
                    toi_class, toi_type, toi_id,
                  ## TCP_REQUEST_INFORMATION_EX
                    ""
                  ].pack('VVVVVa16')
        reqsize = API.packdw(reqinfo.size)
        buff = "\0" * buffsize
        buffsize = API.packdw(buffsize)
        result = WsControl.call(
                   IPPROTO_TCP,
                   WSCTL_TCP_QUERY_INFORMATION,
                   reqinfo, reqsize,
                   buff, buffsize)
        if result != 0
          raise RuntimeError, "WsControl failed.(#{result})"
        end
        [ buff, API.unpackdw(buffsize) ]
      end
      private_class_method :wsctl
      
      def self.get_iflist
        # Get TDI Entity List
        entities, size =
          wsctl(GENERIC_ENTITY, 0,
                INFO_CLASS_GENERIC,
                INFO_TYPE_PROVIDER,
                ENTITY_LIST_ID,
                MAX_TDI_ENTITIES * 8)  # sizeof(TDIEntityID)
        entities = entities[0, size].
                     scan(/.{8}/).
                     collect { |e| e.unpack('VV') }

        # Get MIB Interface List
        iflist = []
        ifcount = 0
        entities.each do |entity, instance|
          if( (entity & IF_ENTITY)>0 )
            ifcount += 1
            etype, = wsctl(entity, instance,
                           INFO_CLASS_GENERIC,
                           INFO_TYPE_PROVIDER,
                           ENTITY_TYPE_ID,
                           4)
            if( (API.unpackdw(etype) & IF_MIB)==IF_MIB )
              ifentry, = wsctl(entity, instance,
                               INFO_CLASS_PROTOCOL,
                               INFO_TYPE_PROVIDER,
                               IF_MIB_STATS_ID,
                               21 * 4 + 8 + 130)  # sizeof(IFEntry)
              iflist << [
                API.unpackdw(ifentry[0,4]),
                ifentry[20, 6]
              ]
            end
          end
        end
        
        # Get IP Addresses
        entities.each do |entity, instance|
          if entity == CL_NL_ENTITY
            etype, = wsctl(entity, instance,
                           INFO_CLASS_GENERIC,
                           INFO_TYPE_PROVIDER,
                           ENTITY_TYPE_ID,
                           4)
            if API.unpackdw(etype) == CL_NL_IP
              ipentries, = wsctl(entity, instance,
                                 INFO_CLASS_PROTOCOL,
                                 INFO_TYPE_PROVIDER,
                                 IP_MIB_ADDRTABLE_ENTRY_ID,
                                 24 * (ifcount+1))  # sizeof(IPAddrEntry)
              ipentries.scan(/.{24}/) do |ipentry|
                ipaddr, index = ipentry.unpack('VV')
                if ifitem = iflist.assoc(index)
                  ifitem << ipaddr
                end
              end
            end
          end
        end
        iflist
      end
    end
  __EOS__
end
#====================================================================
  end
end