public async Task SendMSearchAsync(IMSearchRequest mSearch)
{
if (mSearch.SearchCastMethod == CastMethod.Multicast)
{
await _httpListener.SendOnMulticast(ComposeMSearchDatagram(mSearch));
}
if (mSearch.SearchCastMethod == CastMethod.Unicast)
{
await SendOnTcp(mSearch.HostIp, mSearch.HostPort, ComposeMSearchDatagram(mSearch));
}
}
private static byte[] ComposeMSearchDatagram(IMSearchRequest request)
{
var stringBuilder = new StringBuilder();
stringBuilder.Append("M-SEARCH * HTTP/1.1\r\n");
stringBuilder.Append(request.SearchCastMethod == CastMethod.Multicast
? "HOST: 239.255.255.250:1900\r\n"
: $"HOST: {request.HostIp}:{request.HostPort}\r\n");
stringBuilder.Append("MAN: \"ssdp:discover\"\r\n");
if (request.SearchCastMethod == CastMethod.Multicast)
{
stringBuilder.Append($"MX: {request.MX.TotalSeconds}\r\n");
}
stringBuilder.Append($"ST: {request.ST}\r\n");
stringBuilder.Append($"USER-AGENT: " +
$"{request.UserAgent.OperatingSystem}/{request.UserAgent.OperatingSystemVersion}" +
$" " +
$"UPnP/{request.UserAgent.UpnpMajorVersion}.{request.UserAgent.UpnpMinorVersion}" +
$" " +
$"{request.UserAgent.ProductName}/{request.UserAgent.ProductVersion}\r\n");
if (request.SearchCastMethod == CastMethod.Multicast)
{
stringBuilder.Append($"CPFN.UPNP.ORG: {request.CPFN}\r\n");
HeaderHelper.AddOptionalHeader(stringBuilder, "TCPPORT.UPNP.ORG", request.TCPPORT);
HeaderHelper.AddOptionalHeader(stringBuilder, "CPUUID.UPNP.ORG", request.CPUUID);
if (request.Headers != null)
{
foreach (var header in request.Headers)
{
stringBuilder.Append($"{header.Key}: {header.Value}\r\n");
}
}
}
stringBuilder.Append("\r\n");
return(Encoding.UTF8.GetBytes(stringBuilder.ToString()));
}
public async Task SendMSearchResponseAsync(IMSearchResponse mSearchResponse, IMSearchRequest mSearchRequest)
{
var wait = new Random();
await Task.Delay(TimeSpan.FromMilliseconds(wait.Next(50, (int)mSearchRequest.MX.TotalMilliseconds)));
if (mSearchResponse.ResponseCastMethod != CastMethod.Unicast)
{
await _httpListener.SendOnMulticast(ComposeMSearchResponseDatagram(mSearchResponse));
}
if (int.TryParse(mSearchRequest.TCPPORT, out int tcpSpecifiedRemotePort))
{
await SendOnTcp(mSearchRequest.HostIp, tcpSpecifiedRemotePort,
ComposeMSearchResponseDatagram(mSearchResponse));
}
else
{
await SendOnTcp(mSearchRequest.HostIp, mSearchRequest.HostPort,
ComposeMSearchResponseDatagram(mSearchResponse));
}
}
public async Task MSearchResponse(IMSearchResponse mSearchResponse, IMSearchRequest mSearchRequest)
{
await SendMSearchResponseAsync(mSearchResponse, mSearchRequest);
}
