private static void OutputResults(DnsQueryResponse response)
{
Console.WriteLine("Bytes received: " + response.BytesReceived);
Console.WriteLine("Name: " + response.Name);
Console.WriteLine("OpCode: " + response.NsClass);
Console.WriteLine("NsFlags: " + response.NsFlags);
Console.WriteLine("NsType: " + response.NsType);
Console.WriteLine("RCode: " + response.RCode);
Console.WriteLine("OpCode: " + response.OpCode);
// Enumerate the Answer Records
Console.WriteLine("Answers:");
foreach (IDnsRecord record in response.Answers)
{
Console.WriteLine(record.Answer);
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
Console.WriteLine();
}
foreach (IDnsRecord record in response.AuthoritiveNameServers)
{
Console.WriteLine(record.Answer);
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
Console.WriteLine();
}
foreach (IDnsRecord record in response.AdditionalRRecords)
{
Console.WriteLine(record.Answer);
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
Console.WriteLine();
}
}
/// <summary>
///
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="host"></param>
/// <param name="queryType"></param>
/// <param name="queryClass"></param>
/// <param name="protocol"></param>
/// <param name="messageSecurityProvider">The instance of the message security provider to use to secure the DNS request.</param>
/// <returns>A <see cref="T:DnDns.Net.Dns.DnsQueryResponse"></see> instance that contains the Dns Answer for the request query.</returns>
/// <PermissionSet>
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public DnsQueryResponse Resolve(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Do stack walk and Demand all callers have DnsPermission.
_dnsPermissions.Demand();
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
// Connect to DNS server and get the record for the current server.
IPHostEntry ipe = System.Net.Dns.GetHostEntry(dnsServer);
IPAddress ipa = ipe.AddressList[0];
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);
byte[] recvBytes = null;
switch (protocol)
{
case ProtocolType.Tcp:
{
recvBytes = ResolveTcp(bDnsQuery, ipep);
break;
}
case ProtocolType.Udp:
{
recvBytes = ResolveUdp(bDnsQuery, ipep);
break;
}
default:
{
throw new InvalidOperationException("Invalid Protocol: " + protocol);
}
}
Trace.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
DnsQueryResponse dnsQR = new DnsQueryResponse();
dnsQR.ParseResponse(recvBytes, protocol);
return(dnsQR);
}
/// <summary>
///
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="host"></param>
/// <param name="queryType"></param>
/// <param name="queryClass"></param>
/// <param name="protocol"></param>
/// <param name="messageSecurityProvider">The instance of the message security provider to use to secure the DNS request.</param>
/// <returns>A <see cref="T:DnDns.Net.Dns.DnsQueryResponse"></see> instance that contains the Dns Answer for the request query.</returns>
/// <PermissionSet>
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public DnsQueryResponse Resolve(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Do stack walk and Demand all callers have DnsPermission.
// FIXME _dnsPermissions.Demand();
DnsQueryResponse dnsQR = new DnsQueryResponse();
// Try a native query if it is supported.
if (Tools.HasSystemDns)
// CS0162 will fire when HasSystemDns is a constant.
#pragma warning disable 162
{
// See https://www.dns-oarc.net/oarc/services/replysizetest - 4k likely plenty.
byte[] answer = new byte[4096];
int answerSize = Tools.SystemResQuery(host, queryClass, queryType, answer);
if (0 < answerSize)
{
dnsQR.ParseResponse(answer, answerSize);
return(dnsQR);
}
else
{
return(null);
}
}
byte[] recvBytes = null;
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
IPAddress[] ipas = System.Net.Dns.GetHostAddresses(dnsServer);
IPEndPoint ipep = null;
foreach (var addr in ipas)
{
if (addr.AddressFamily == AddressFamily.InterNetwork)
{
ipep = new IPEndPoint(addr, (int)UdpServices.Domain);
break;
}
}
if (null == ipep)
{
throw new Exception(string.Format("No IPv4 address found for hostname {0}", dnsServer));
}
switch (protocol)
{
case ProtocolType.Tcp:
{
recvBytes = ResolveTcp(bDnsQuery, ipep);
break;
}
case ProtocolType.Udp:
{
recvBytes = ResolveUdp(bDnsQuery, ipep);
break;
}
default:
{
throw new InvalidOperationException("Invalid Protocol: " + protocol);
}
}
Trace.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
dnsQR.ParseResponse(recvBytes);
return(dnsQR);
}
/// <summary>
///
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="host"></param>
/// <param name="queryType"></param>
/// <param name="queryClass"></param>
/// <param name="protocol"></param>
/// <param name="messageSecurityProvider">The instance of the message security provider to use to secure the DNS request.</param>
/// <returns>A <see cref="T:DnDns.Net.Dns.DnsQueryResponse"></see> instance that contains the Dns Answer for the request query.</returns>
/// <PermissionSet>
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public DnsQueryResponse Resolve(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Do stack walk and Demand all callers have DnsPermission.
_dnsPermissions.Demand();
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
// Connect to DNS server and get the record for the current server.
IPHostEntry ipe = System.Net.Dns.GetHostEntry(dnsServer);
IPAddress ipa = ipe.AddressList[0];
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);
byte[] recvBytes = null;
switch (protocol)
{
case ProtocolType.Tcp:
{
recvBytes = ResolveTcp(bDnsQuery, ipep);
break;
}
case ProtocolType.Udp:
{
recvBytes = ResolveUdp(bDnsQuery, ipep);
break;
}
default:
{
throw new InvalidOperationException("Invalid Protocol: " + protocol);
}
}
Trace.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
DnsQueryResponse dnsQR = new DnsQueryResponse();
dnsQR.ParseResponse(recvBytes, protocol);
return dnsQR;
}
/// <summary>
///
/// </summary>
/// <param name="dnsServer"></param>
/// <param name="host"></param>
/// <param name="queryType"></param>
/// <param name="queryClass"></param>
/// <param name="protocol"></param>
/// <param name="messageSecurityProvider">The instance of the message security provider to use to secure the DNS request.</param>
/// <returns>A <see cref="T:DnDns.Net.Dns.DnsQueryResponse"></see> instance that contains the Dns Answer for the request query.</returns>
/// <PermissionSet>
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public DnsQueryResponse Resolve(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
{
// Do stack walk and Demand all callers have DnsPermission.
// FIXME _dnsPermissions.Demand();
DnsQueryResponse dnsQR = new DnsQueryResponse();
// Try a native query if it is supported.
if (Tools.HasSystemDns)
// CS0162 will fire when HasSystemDns is a constant.
#pragma warning disable 162
{
// See https://www.dns-oarc.net/oarc/services/replysizetest - 4k likely plenty.
byte[] answer = new byte[4096];
int answerSize = Tools.SystemResQuery (host, queryClass, queryType, answer);
if (0 < answerSize) {
dnsQR.ParseResponse (answer, answerSize);
return dnsQR;
} else {
return null;
}
}
byte[] recvBytes = null;
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
IPAddress[] ipas = System.Net.Dns.GetHostAddresses (dnsServer);
IPEndPoint ipep = null;
foreach (var addr in ipas) {
if (addr.AddressFamily == AddressFamily.InterNetwork) {
ipep = new IPEndPoint(addr, (int)UdpServices.Domain);
break;
}
}
if (null == ipep) {
throw new Exception (string.Format ("No IPv4 address found for hostname {0}", dnsServer));
}
switch (protocol)
{
case ProtocolType.Tcp:
{
recvBytes = ResolveTcp(bDnsQuery, ipep);
break;
}
case ProtocolType.Udp:
{
recvBytes = ResolveUdp(bDnsQuery, ipep);
break;
}
default:
{
throw new InvalidOperationException("Invalid Protocol: " + protocol);
}
}
Trace.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
dnsQR.ParseResponse(recvBytes);
return dnsQR;
}
bool ParseDnsResponse(DnsQueryResponse ur)
{
if (ur.RCode != RCode.NoError)
return false;
foreach (IDnsRecord record in ur.Answers) {
//Console.WriteLine (record.Answer + ", " + record.DnsHeader.NsType);
if (record.DnsHeader.NsType == NsType.A)
AList.Add (IPAddress.Parse (record.Answer.Replace ("Address: ", "")));
if (record.DnsHeader.NsType == NsType.AAAA && Proxy.IPv6)
AList.Add (IPAddress.Parse (record.Answer.Replace ("Address: ", "")));
if (record.DnsHeader.NsType == NsType.CNAME)
NameList.Add (record.Answer.Replace ("Host: ", "").Trim ('.'));
}
return true;
}