/// <summary>
/// Hands the socket handle to the DTLS context and waits for the handshake to complete.
/// </summary>
/// <param name="webRtcSession">The WebRTC session to perform the DTLS handshake on.</param>
/// <returns>True if the handshake completes successfully. False if not.</returns>
private static bool DoDtlsHandshake(WebRtcSession webRtcSession)
{
Console.WriteLine("DoDtlsHandshake started.");
var dtls = new DtlsHandshake(DTLS_CERTIFICATE_PATH, DTLS_KEY_PATH);
webRtcSession.OnClose += (reason) => dtls.Shutdown();
int res = dtls.DoHandshakeAsServer((ulong)webRtcSession.GetRtpChannel(SDPMediaTypesEnum.audio).RtpSocket.Handle);
Console.WriteLine("DtlsContext initialisation result=" + res);
if (dtls.IsHandshakeComplete())
{
Console.WriteLine("DTLS negotiation complete.");
// TODO fix race condition!!! First RTP packet is not getting decrypted.
var srtpSendContext = new Srtp(dtls, false);
var srtpReceiveContext = new Srtp(dtls, true);
webRtcSession.SetSecurityContext(
srtpSendContext.ProtectRTP,
srtpReceiveContext.UnprotectRTP,
srtpSendContext.ProtectRTCP,
srtpReceiveContext.UnprotectRTCP);
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Hands the socket handle to the DTLS context and waits for the handshake to complete.
/// </summary>
/// <param name="webRtcSession">The WebRTC session to perform the DTLS handshake on.</param>
/// <returns>True if the handshake completed successfully or false otherwise.</returns>
private static bool DoDtlsHandshake(WebRtcSession webRtcSession)
{
logger.LogDebug("DoDtlsHandshake started.");
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 DtlsHandshake(DTLS_CERTIFICATE_PATH, DTLS_KEY_PATH);
webRtcSession.OnClose += (reason) => dtls.Shutdown();
int res = dtls.DoHandshakeAsServer((ulong)webRtcSession.GetRtpChannel(SDPMediaTypesEnum.audio).RtpSocket.Handle);
logger.LogDebug("DtlsContext initialisation result=" + res);
if (dtls.IsHandshakeComplete())
{
logger.LogDebug("DTLS negotiation complete.");
var srtpSendContext = new Srtp(dtls, false);
var srtpReceiveContext = new Srtp(dtls, true);
webRtcSession.SetSecurityContext(
srtpSendContext.ProtectRTP,
srtpReceiveContext.UnprotectRTP,
srtpSendContext.ProtectRTCP,
srtpReceiveContext.UnprotectRTCP);
return(true);
}
else
{
return(false);
}
}