public Packet CreateDnsReply(EthernetDatagram etherpacket, IpV4Address newAddress)
{
var ipPacket = etherpacket.IpV4;
var udpPacket = ipPacket.Udp;
var dnsPacket = udpPacket.Dns;
if (!dnsPacket.IsQuery)
{
throw new Exception("Packet should be a dns query!");
}
EthernetLayer ethernetLayer = new EthernetLayer
{
Source = etherpacket.Destination,
Destination = etherpacket.Source,
};
IpV4Layer ipLayer = new IpV4Layer
{
Source = ipPacket.Destination,
CurrentDestination = ipPacket.Source,
};
UdpLayer udpLayer = new UdpLayer
{
SourcePort = udpPacket.DestinationPort,
DestinationPort = udpPacket.SourcePort
};
DnsResourceData resourceData = new DnsResourceDataIpV4(newAddress);
DnsDataResourceRecord resourceRecord = new DnsDataResourceRecord(dnsPacket.Queries[0].DomainName,
dnsPacket.Queries[0].DnsType,
dnsPacket.Queries[0].DnsClass,
60,
resourceData);
DnsLayer dnsLayer = new DnsLayer
{
Queries = dnsPacket.Queries,
IsQuery = false,
IsResponse = true,
Id = dnsPacket.Id,
Answers = new[] { resourceRecord }
};
PacketBuilder builder = new PacketBuilder(ethernetLayer, ipLayer, udpLayer, dnsLayer);
return(builder.Build(DateTime.Now));
}
private void btnAdd_Click(object sender, EventArgs e)
{
object data = new DnsResourceDataDomainName(new DnsDomainName(txtData.Text));
if (cmbDataType.SelectedIndex == 1)
{
data = new DnsResourceDataIpV4(new IpV4Address(txtData.Text));
}
else if (cmbDataType.SelectedIndex == 2)
{
data = new DnsResourceDataIpV6(new IpV6Address(txtData.Text));
}
DnsDataResourceRecord record = new DnsDataResourceRecord(
new DnsDomainName(txtDomainName.Text),
(DnsType)Enum.Parse(typeof(DnsType), cmbType.SelectedItem.ToString()),
(DnsClass)Enum.Parse(typeof(DnsClass), cmbClass.SelectedItem.ToString())
, int.Parse(txtTTL.Text),
(DnsResourceData)data);
tabDNS.addToAnswers(record);
this.Close();
}
public void DnsResourceDataIpV4ParseWrongLengthTest()
{
var resourceData = new DnsResourceDataIpV4(IpV4Address.Zero);
TestResourceRecordIsNotCreatedWithNewLength(DnsType.A, resourceData, 1);
}
public Packet CreateDnsReply(EthernetDatagram etherpacket, IpV4Address newAddress)
{
var ipPacket = etherpacket.IpV4;
var udpPacket = ipPacket.Udp;
var dnsPacket = udpPacket.Dns;
if (!dnsPacket.IsQuery)
throw new Exception("Packet should be a dns query!");
EthernetLayer ethernetLayer = new EthernetLayer
{
Source = etherpacket.Destination,
Destination = etherpacket.Source,
};
IpV4Layer ipLayer = new IpV4Layer
{
Source = ipPacket.Destination,
CurrentDestination = ipPacket.Source,
};
UdpLayer udpLayer = new UdpLayer
{
SourcePort = udpPacket.DestinationPort,
DestinationPort = udpPacket.SourcePort
};
DnsResourceData resourceData = new DnsResourceDataIpV4(newAddress);
DnsDataResourceRecord resourceRecord = new DnsDataResourceRecord(dnsPacket.Queries[0].DomainName,
dnsPacket.Queries[0].DnsType,
dnsPacket.Queries[0].DnsClass,
60,
resourceData);
DnsLayer dnsLayer = new DnsLayer
{
Queries = dnsPacket.Queries,
IsQuery = false,
IsResponse = true,
Id = dnsPacket.Id,
Answers = new[] { resourceRecord }
};
PacketBuilder builder = new PacketBuilder(ethernetLayer, ipLayer, udpLayer, dnsLayer);
return builder.Build(DateTime.Now);
}
