public static DnsMessage FromDnsJson(HttpContext context, bool ActiveEcs = true, byte EcsDefaultMask = 24)
{
var queryDictionary = context.Request.Query;
var dnsQuestion = new DnsQuestion(DomainName.Parse(queryDictionary["name"]), RecordType.A,
RecordClass.INet);
if (queryDictionary.ContainsKey("type"))
{
if (Enum.TryParse(queryDictionary["type"], true, out RecordType rType))
{
dnsQuestion = new DnsQuestion(DomainName.Parse(queryDictionary["name"]), rType,
RecordClass.INet);
}
}
var dnsQMsg = new DnsMessage
{
IsEDnsEnabled = true,
IsQuery = true,
IsRecursionAllowed = true,
IsRecursionDesired = true,
TransactionID = Convert.ToUInt16(new Random(DateTime.Now.Millisecond).Next(1, 99))
};
dnsQMsg.Questions.Add(dnsQuestion);
if (!Config.EcsEnable || !ActiveEcs || queryDictionary.ContainsKey("no-ecs"))
{
return(dnsQMsg);
}
if (queryDictionary.ContainsKey("edns_client_subnet"))
{
var ipStr = queryDictionary["edns_client_subnet"].ToString();
var ipNetwork = ipStr.Contains("/")
? IPNetwork.Parse(ipStr)
: IPNetwork.Parse(ipStr, EcsDefaultMask);
dnsQMsg.EDnsOptions.Options.Add(new ClientSubnetOption(
Equals(ipNetwork.Network, IPAddress.Any) ? (byte)0 : ipNetwork.Cidr, ipNetwork.Network));
}
else
{
var realIp = RealIP.Get(context);
if (!Equals(realIp, IPAddress.Loopback))
{
dnsQMsg.EDnsOptions.Options.Add(
new ClientSubnetOption(EcsDefaultMask,
IPNetwork.Parse(realIp.ToString(), EcsDefaultMask).Network));
}
}
return(dnsQMsg);
}
public static DnsMessage FromWebBase64(HttpContext context, bool ActiveEcs = true)
{
var queryDictionary = context.Request.Query;
var msg = FromWebBase64(queryDictionary["dns"].ToString());
if (!Config.EcsEnable || !ActiveEcs)
{
return(msg);
}
if (IsEcsEnable(msg))
{
return(msg);
}
if (!msg.IsEDnsEnabled)
{
msg.IsEDnsEnabled = true;
}
msg.EDnsOptions.Options.Add(new ClientSubnetOption(24, IPNetwork.Parse(RealIP.Get(context).ToString(), 24).Network));
return(msg);
}
public static DnsMessage FromWebBase64(HttpContext context, bool ActiveEcs = true, byte EcsDefaultMask = 24)
{
var msg = FromWebBase64(context.Request.Query["dns"].ToString());
if (!Config.EcsEnable || !ActiveEcs || context.Request.Query.ContainsKey("no-ecs"))
{
return(msg);
}
if (IsEcsEnable(msg))
{
return(msg);
}
if (!msg.IsEDnsEnabled)
{
msg.IsEDnsEnabled = true;
}
msg.EDnsOptions.Options.Add(new ClientSubnetOption(EcsDefaultMask,
IPNetwork.Parse(RealIP.Get(context).ToString(), EcsDefaultMask).Network));
return(msg);
}
public static async Task <DnsMessage> FromPostByteAsync(HttpContext context, bool ActiveEcs = true,
byte EcsDefaultMask = 24)
{
var msg = DnsMessage.Parse((await context.Request.BodyReader.ReadAsync()).Buffer.ToArray());
if (!Config.EcsEnable || !ActiveEcs || context.Request.Query.ContainsKey("no-ecs"))
{
return(msg);
}
if (IsEcsEnable(msg))
{
return(msg);
}
if (!msg.IsEDnsEnabled)
{
msg.IsEDnsEnabled = true;
}
msg.EDnsOptions.Options.Add(new ClientSubnetOption(EcsDefaultMask,
IPNetwork.Parse(RealIP.Get(context).ToString(), EcsDefaultMask).Network));
return(msg);
}
