static async Task <IDictionary <string, Response> > ResolveInternal(ZeroconfOptions options,
Action <string, Response> callback,
CancellationToken cancellationToken)
{
var requestBytes = GetRequestBytes(options);
using (options.AllowOverlappedQueries ? Disposable.Empty : await ResolverLock.LockAsync())
{
cancellationToken.ThrowIfCancellationRequested();
var dict = new Dictionary <string, Response>();
void Converter(IPAddress address, byte[] buffer)
{
var resp = new Response(buffer);
var firstPtr = resp.RecordsPTR.FirstOrDefault();
var name = firstPtr?.PTRDNAME.Split('.')[0] ?? string.Empty;
var addrString = address.ToString();
Debug.WriteLine($"IP: {addrString}, {(string.IsNullOrEmpty(name) ? string.Empty : $"Name: {name}, ")}Bytes: {buffer.Length}, IsResponse: {resp.header.QR}");
if (resp.header.QR)
{
var key = $"{addrString}{(string.IsNullOrEmpty(name) ? "" : $": {name}")}";
lock (dict)
{
dict[key] = resp;
}
callback?.Invoke(key, resp);
}
}
Debug.WriteLine($"Looking for {string.Join(", ", options.Protocols)} with scantime {options.ScanTime}");
if (options.Adapter != null)
{
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
Converter,
options.Adapter,
cancellationToken)
.ConfigureAwait(false);
}
else
{
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
Converter,
cancellationToken)
.ConfigureAwait(false);
}
return(dict);
}
}
static byte[] GetRequestBytes(ZeroconfOptions options)
{
var req = new Request();
var queryType = options.ScanQueryType == ScanQueryType.Ptr ? QType.PTR : QType.ANY;
foreach (var protocol in options.Protocols)
{
var question = new Question(protocol, queryType, QClass.IN);
req.AddQuestion(question);
}
return(req.Data);
}
static byte[] GetRequestBytes(ZeroconfOptions options)
{
var req = new Request();
var classType = options.ScanClassType == ScanClassType.In ? QClass.IN : QClass.ANY;
foreach (var protocol in options.Protocols)
{
foreach (var queryType in options.ScanQueryTypes)
{
var question = new Question(protocol, ScanQueryToQType(queryType), classType);
req.AddQuestion(question);
}
}
return(req.Data);
}
static async Task <IDictionary <string, Response> > ResolveInternal(ZeroconfOptions options,
Action <string, Response> callback,
CancellationToken cancellationToken)
{
var requestBytes = GetRequestBytes(options);
using (await ResolverLock.LockAsync())
{
cancellationToken.ThrowIfCancellationRequested();
var dict = new Dictionary <string, Response>();
Action <string, byte[]> converter =
(address, buffer) =>
{
var resp = new Response(buffer);
Debug.WriteLine($"IP: {address}, Bytes: {buffer.Length}, IsResponse: {resp.header.QR}");
if (resp.header.QR)
{
lock (dict)
{
dict[address] = resp;
}
callback?.Invoke(address, resp);
}
};
Debug.WriteLine($"Looking for {string.Join(", ", options.Protocols)} with scantime {options.ScanTime}");
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
converter,
cancellationToken)
.ConfigureAwait(false);
return(dict);
}
}
static async Task <IDictionary <string, Response> > ResolveInternal(ZeroconfOptions options,
Action <string, Response> callback,
CancellationToken cancellationToken)
{
var requestBytes = GetRequestBytes(options);
using (options.AllowOverlappedQueries ? Disposable.Empty : await ResolverLock.LockAsync())
{
cancellationToken.ThrowIfCancellationRequested();
var dict = new Dictionary <string, Response>();
void Converter(IPAddress address, byte[] buffer)
{
var resp = new Response(buffer);
var firstPtr = resp.RecordsPTR.FirstOrDefault();
var name = firstPtr?.PTRDNAME.Split('.')[0] ?? string.Empty;
var addrString = address.ToString();
Debug.WriteLine($"IP: {addrString}, {(string.IsNullOrEmpty(name) ? string.Empty : $"Name: {name}, ")}Bytes: {buffer.Length}, IsResponse: {resp.header.QR}");
if (resp.header.QR)
{
// see if the IP is the same as the A to filter out dups that might echo from other interfaces
var aRec = resp.RecordsA.FirstOrDefault();
var additionalARec = resp.Additionals.FirstOrDefault(arr => arr.Type == Type.A)?.RECORD as RecordA;
// if we have an aRec or additionalARec, check those
bool?matches = null;
if (aRec != null || additionalARec != null)
{
matches = string.Equals(aRec?.Address, addrString, StringComparison.OrdinalIgnoreCase) ||
string.Equals(additionalARec?.Address, addrString, StringComparison.OrdinalIgnoreCase);
}
if (matches ?? true)
{
var key = $"{addrString}{(string.IsNullOrEmpty(name) ? "" : $": {name}")}";
lock (dict)
{
dict[key] = resp;
}
callback?.Invoke(key, resp);
}
}
}
Debug.WriteLine($"Looking for {string.Join(", ", options.Protocols)} with scantime {options.ScanTime}");
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
Converter,
cancellationToken)
.ConfigureAwait(false);
return(dict);
}
}
static async Task <IDictionary <string, Response> > ResolveInternal(ZeroconfOptions options,
Action <string, Response> callback,
CancellationToken cancellationToken)
{
var requestBytes = GetRequestBytes(options);
using (options.AllowOverlappedQueries ? Disposable.Empty : await ResolverLock.LockAsync())
{
cancellationToken.ThrowIfCancellationRequested();
var dict = new Dictionary <string, Response>();
void Converter(IPAddress address, byte[] buffer)
{
var resp = new Response(buffer);
var firstPtr = resp.RecordsPTR.FirstOrDefault();
var name = firstPtr?.PTRDNAME.Split('.')[0] ?? string.Empty;
var addrString = address.ToString();
Debug.WriteLine($"IP: {addrString}, {(string.IsNullOrEmpty(name) ? string.Empty : $"Name: {name}, ")}Bytes: {buffer.Length}, IsResponse: {resp.header.QR}");
if (resp.header.QR)
{
// see if the IP is the same as the A to filter out dups that might echo from other interfaces
var aRec = resp.RecordsA.FirstOrDefault();
var additionalARec = resp.Additionals.FirstOrDefault(arr => arr.Type == Type.A)?.RECORD as RecordA;
// if we have an aRec or additionalARec, check those
bool?matches = null;
if (aRec != null || additionalARec != null)
{
matches = string.Equals(aRec?.Address, addrString, StringComparison.OrdinalIgnoreCase) ||
string.Equals(additionalARec?.Address, addrString, StringComparison.OrdinalIgnoreCase);
}
if (matches ?? true)
{
// Key is IP Address. Multiple responses from the same IP mean truncated DNS response packets.
// Reassemble them here...this does break the header and raw fields but downstream
// just uses the lists of records.
var key = $"{addrString}";// {(string.IsNullOrEmpty(name) ? "" : $": {name}")}";
lock (dict)
{
Response prevresp = null;
if (!dict.TryGetValue(key, out prevresp))
{
dict[key] = resp;
}
else
{
// Add the new response records to the previous
prevresp.Answers.AddRange(resp.Answers);
}
}
callback?.Invoke(key, resp);
}
}
}
Debug.WriteLine($"Looking for {string.Join(", ", options.Protocols)} with scantime {options.ScanTime}");
// If there isn't a forced adapter, check all devices
if (options.Adapter == null)
{
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
Converter,
cancellationToken)
.ConfigureAwait(false);
}
else
{
await NetworkInterface.NetworkRequestAsync(requestBytes,
options.ScanTime,
options.Retries,
(int)options.RetryDelay.TotalMilliseconds,
Converter,
options.Adapter,
cancellationToken)
.ConfigureAwait(false);
}
return(dict);
}
}
