/// <summary>
/// Handles SSDP M-SEARCH requests over UDP multicast and unicast.
/// </summary>
/// <param name="header">HTTP request header of the request to handle.</param>
/// <param name="config">Endpoint configuration which received the request.</param>
/// <param name="remoteEP">Remote endpoint which sent the request.</param>
protected void HandleSSDPRequest(SimpleHTTPRequest header, EndpointConfiguration config, IPEndPoint remoteEP)
{
switch (header.Method)
{
case "M-SEARCH":
if (header.Param != "*" || header["MAN"] != "\"ssdp:discover\"")
throw new InvalidDataException("Unsupported Request");
// We don't make a difference between multicast and unicast search requests here,
// the only difference is the existance of the MX header field.
// If it is present, we simply use this random delay for the answer, and if it is
// not present, we send the answer at once.
int mx; // Max. seconds to delay response
if (!int.TryParse(header["MX"], out mx))
mx = 0;
else if (mx < 1)
// Malformed request
throw new InvalidDataException("Invalid MX header value");
if (mx > 5)
mx = 5; // Should be bounded to 5, according to (DevArch)
string st = header["ST"]; // Search target
if (header.ContainsHeader("USER-AGENT")) // Optional
CheckUserAgentUPnPVersion(header["USER-AGENT"]);
DelaySearchResponse(new PendingSearchRequest(st, config, remoteEP), mx);
break;
}
}
