class Resolv - win32: Ruby Standard Library Documentation

# class Resolv

###### ¶ ↑

    Windows NT

###### ¶ ↑

### Constants

API
Error
TCPIP_NT

### Public Class Methods

get_hosts_path() click to toggle source

    # File win32/lib/win32/resolv.rb, line 14
    def self.get_hosts_path
      path = get_hosts_dir
      path = File.expand_path('hosts', path)
      File.exist?(path) ? path : nil
    end

get_resolv_info() click to toggle source

    # File win32/lib/win32/resolv.rb, line 20
    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

### Private Class Methods

get_dns_server_list() click to toggle source

    static VALUE
    get_dns_server_list(VALUE self)
    {
        FIXED_INFO *fixedinfo = NULL;
        ULONG buflen = 0;
        DWORD ret;
        VALUE buf, nameservers = Qnil;

        ret = GetNetworkParams(NULL, &buflen);
        if (ret != NO_ERROR && ret != ERROR_BUFFER_OVERFLOW) {
            w32error_raise(ret);
        }
        fixedinfo = ALLOCV(buf, buflen);
        ret = GetNetworkParams(fixedinfo, &buflen);
        if (ret == NO_ERROR) {
            const IP_ADDR_STRING *ipaddr = &fixedinfo->DnsServerList;
            nameservers = rb_ary_new();
            do {
                const char *s = ipaddr->IpAddress.String;
                if (!*s) continue;
                if (strcmp(s, "0.0.0.0") == 0) continue;
                rb_ary_push(nameservers, rb_str_new_cstr(s));
            } while ((ipaddr = ipaddr->Next) != NULL);
        }
        ALLOCV_END(buf);
        if (ret != NO_ERROR) w32error_raise(ret);

        return nameservers;
    }

get_hosts_dir() click to toggle source

    # File win32/lib/win32/resolv.rb, line 69
    def get_hosts_dir
      Registry::HKEY_LOCAL_MACHINE.open(TCPIP_NT) do |reg|
        reg.read_s_expand('DataBasePath')
      end
    end

get_info() click to toggle source

    # File win32/lib/win32/resolv.rb, line 75
    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