/// <summary>
/// Hands the socket handle to the DTLS context and waits for the handshake to complete.
/// </summary>
/// <param name="rtpSocket">The RTP socket being used for the WebRTC session.</param>
private static int DoDtlsHandshake(WebRtcSession webRtcSession, Socket rtpSocket, out ProtectRtpPacket protectRtp, out ProtectRtpPacket protectRtcp)
{
logger.LogDebug("DoDtlsHandshake started.");
protectRtp = null;
protectRtcp = null;
if (!File.Exists(DTLS_CERTIFICATE_PATH))
{
throw new ApplicationException($"The DTLS certificate file could not be found at {DTLS_CERTIFICATE_PATH}.");
}
else if (!File.Exists(DTLS_KEY_PATH))
{
throw new ApplicationException($"The DTLS key file could not be found at {DTLS_KEY_PATH}.");
}
var dtls = new Dtls(DTLS_CERTIFICATE_PATH, DTLS_KEY_PATH);
webRtcSession.OnClose += (reason) => dtls.Shutdown();
int res = dtls.DoHandshake((ulong)rtpSocket.Handle);
logger.LogDebug("DtlsContext initialisation result=" + res);
if (dtls.GetState() == (int)DtlsState.OK)
{
logger.LogDebug("DTLS negotiation complete.");
var srtpContext = new Srtp(dtls, false);
protectRtp = srtpContext.ProtectRTP;
protectRtcp = srtpContext.ProtectRTCP;
}
return(res);
}
