/// <summary>
/// Creates a RtspResponse based on the SequenceNumber contained in the given RtspRequest
/// </summary>
/// <param name="request">The request to utilize the SequenceNumber from, if null the current SequenceNumber is used</param>
/// <param name="statusCode">The StatusCode of the generated response</param>
/// <returns>The RtspResponse created</returns>
internal RtspMessage CreateRtspResponse(RtspMessage request = null, RtspStatusCode statusCode = RtspStatusCode.OK, string body = null)
{
RtspMessage response = new RtspMessage(RtspMessageType.Response);
response.StatusCode = statusCode;
/*
12.4.1 400 Bad Request
The request could not be understood by the server due to malformed
syntax. The client SHOULD NOT repeat the request without
modifications [H10.4.1]. If the request does not have a CSeq header,
the server MUST NOT include a CSeq in the response.
*/
if (request != null)
{
if (request.ContainsHeader(RtspHeaders.Session)) response.SetHeader(RtspHeaders.Session, request.GetHeader(RtspHeaders.Session));
if (statusCode != RtspStatusCode.BadRequest) response.CSeq = request.CSeq;
}
else if (statusCode != RtspStatusCode.BadRequest && LastRequest.CSeq >= 0) response.CSeq = LastRequest.CSeq;
//Include any body.
if (false == string.IsNullOrWhiteSpace(body)) response.Body = body;
return response;
}
/// <summary>
/// Sends a Rtsp Response on the given client session
/// </summary>
/// <param name="message">The RtspResponse to send</param> If this was byte[] then it could handle http
/// <param name="ci">The session to send the response on</param>
internal void ProcessSendRtspMessage(RtspMessage message, ClientSession session, bool sendResponse = true)
{
//Todo have a SupportedFeatures and RequiredFeatures HashSet.
//Check Require Header
// And
/* Add Unsupported Header if needed
Require: play.basic, con.persistent
(basic play, TCP is supported)
setup.playing means that setup and teardown can be used in the play state.
*/
//If we have a session
if (session == null || session.IsDisposed) return;
try
{
//if there is a message to send
if (message != null && false == message.IsDisposed)
{
//AddServerHeaders()->
if (false == message.ContainsHeader(RtspHeaders.Server)) message.SetHeader(RtspHeaders.Server, ServerName);
if (false == message.ContainsHeader(RtspHeaders.Date)) message.SetHeader(RtspHeaders.Date, DateTime.UtcNow.ToString("r"));
#region RFC2326 12.38 Timestamp / Delay
/*
12.38 Timestamp
The timestamp general header describes when the client sent the
request to the server. The value of the timestamp is of significance
only to the client and may use any timescale. The server MUST echo
the exact same value and MAY, if it has accurate information about
this, add a floating point number indicating the number of seconds
that has elapsed since it has received the request. The timestamp is
used by the client to compute the round-trip time to the server so
that it can adjust the timeout value for retransmissions.
Timestamp = "Timestamp" ":" *(DIGIT) [ "." *(DIGIT) ] [ delay ]
delay = *(DIGIT) [ "." *(DIGIT) ]
*/
if (false == message.ContainsHeader(RtspHeaders.Timestamp)
&&
session.LastRequest != null
&&
session.LastRequest.ContainsHeader(RtspHeaders.Timestamp))
{
////Apparently not joined with ;
////message.SetHeader(RtspHeaders.Timestamp, session.LastRequest[RtspHeaders.Timestamp] + "delay=" + (DateTime.UtcNow - session.LastRequest.Created).TotalSeconds);
//Set the value of the Timestamp header as given
message.AppendOrSetHeader(RtspHeaders.Timestamp, session.LastRequest[RtspHeaders.Timestamp]);
//Add a delay datum
message.AppendOrSetHeader(RtspHeaders.Timestamp, "delay=" + (DateTime.UtcNow - session.LastRequest.Created).TotalSeconds);
}
#endregion
string sess = message.GetHeader(RtspHeaders.Session);
//Check for a session header
if (false == string.IsNullOrWhiteSpace(sess))
{
//Add the timeout header if there was a session header.
if (RtspClientInactivityTimeout > TimeSpan.Zero && false == sess.Contains("timeout")) message.AppendOrSetHeader(RtspHeaders.Session, "timeout=" + (int)(RtspClientInactivityTimeout.TotalSeconds / 2));
}
//Oops
//if (session.m_RtspSocket.ProtocolType == ProtocolType.Tcp && session.Attached.Count > 0) response.SetHeader("Ignore", "$0\09\r\n$\0:\0");
//Dispose the last response
if (session.LastResponse != null) session.LastResponse.Dispose();
//Todo
//Content-Encoding should be the same as the request's if possible..
//If sending a response
if (sendResponse)
{
//Log response
if (Logger != null) Logger.LogResponse(message, session);
session.SendRtspData((session.LastResponse = message).ToBytes());
}//Otherwise just update the property
else session.LastResponse = message;
//Indicate the session is not disconnected
session.IsDisconnected = false;
//Indicate the last response was sent now.
session.LastResponse.Transferred = DateTime.UtcNow;
}
else
{
//Test the connectivity and start another receive
session.SendRtspData(Media.Common.MemorySegment.EmptyBytes);
}
}
catch (Exception ex)
{
if (Logger != null) Logger.LogException(ex);
//if a socket exception occured then handle it.
if (session != null && ex is SocketException) HandleClientSocketException((SocketException)ex, session);
}
}
protected virtual void ProcessHttpRtspRequest(IAsyncResult iar)
{
if (iar == null) return;
var context = m_HttpListner.EndGetContext(iar);
m_HttpListner.BeginGetContext(new AsyncCallback(ProcessHttpRtspRequest), null);
if (context == null) return;
if (context.Request.AcceptTypes.Any(t => string.Compare(t, "application/x-rtsp-tunnelled") == 0))
{
if (context.Request.HasEntityBody)
{
using (var ips = context.Request.InputStream)
{
long size = context.Request.ContentLength64;
byte[] buffer = new byte[size];
int offset = 0;
while (size > 0)
{
size -= offset += ips.Read(buffer, offset, (int)size);
}
//Ensure the message is really Rtsp
RtspMessage request = new RtspMessage(System.Convert.FromBase64String(context.Request.ContentEncoding.GetString(buffer)));
//Check for validity
if (request.MessageType != RtspMessageType.Invalid)
{
//Process the request when complete
if (request.IsComplete)
{
ProcessRtspRequest(request, CreateSession(null), false);
return;
}
}
}
}
else //No body
{
RtspMessage request = new RtspMessage()
{
Location = new Uri(RtspMessage.ReliableTransport + "://" + context.Request.LocalEndPoint.Address.ToString() + context.Request.RawUrl),
Method = RtspMethod.DESCRIBE
};
foreach (var header in context.Request.Headers.AllKeys)
{
request.SetHeader(header, context.Request.Headers[header]);
}
ProcessRtspRequest(request, CreateSession(null), false);
}
}
}
internal virtual void ProcessAuthorizationRequired(IMedia source, ClientSession session, bool sendResponse = true)
{
RtspMessage response = new RtspMessage(RtspMessageType.Response);
response.CSeq = session.LastRequest.CSeq;
string authHeader = session.LastRequest.GetHeader(RtspHeaders.Authorization);
RtspStatusCode statusCode;
bool noAuthHeader = string.IsNullOrWhiteSpace(authHeader);
if (noAuthHeader && session.LastRequest.ContainsHeader(RtspHeaders.AcceptCredentials)) statusCode = RtspStatusCode.ConnectionAuthorizationRequired;
//If the last request did not have an authorization header
else if (noAuthHeader)
{
/* -- http://tools.ietf.org/html/rfc2617
qop
Indicates what "quality of protection" the client has applied to
the message. If present, its value MUST be one of the alternatives
the server indicated it supports in the WWW-Authenticate header.
These values affect the computation of the request-digest. Note
that this is a single token, not a quoted list of alternatives as
in WWW- Authenticate. This directive is optional in order to
preserve backward compatibility with a minimal implementation of
RFC 2617 [6], but SHOULD be used if the server indicated that qop
is supported by providing a qop directive in the WWW-Authenticate
header field.
cnonce
This MUST be specified if a qop directive is sent (see above), and
MUST NOT be specified if the server did not send a qop directive in
the WWW-Authenticate header field. The cnonce-value is an opaque
quoted string value provided by the client and used by both client
and server to avoid chosen plaintext attacks, to provide mutual
authentication, and to provide some message integrity protection.
See the descriptions below of the calculation of the response-
digest and request-digest values.
*/
//Could retrieve values from last Request if needed..
//string realm = "//", nOnceCount = "00000001";
//Should handle multiple types of auth
//Should store the nonce and cnonce values on the session
statusCode = RtspStatusCode.Unauthorized;
NetworkCredential requiredCredential = null;
string authenticateHeader = null;
Uri relativeLocation = source.ServerLocation;
//Check for Digest first - Todo Finish implementation
if ((requiredCredential = RequiredCredentials.GetCredential(relativeLocation, "Digest")) != null)
{
//Might need to store values qop nc, cnonce and nonce in session storage for later retrival
//Should use auth-int and qop
authenticateHeader = string.Format(System.Globalization.CultureInfo.InvariantCulture, "Digest username={0},realm={1},nonce={2},cnonce={3}", requiredCredential.UserName, (string.IsNullOrWhiteSpace(requiredCredential.Domain) ? ServerName : requiredCredential.Domain), ((long)(Utility.Random.Next(int.MaxValue) << 32 | (Utility.Random.Next(int.MaxValue)))).ToString("X"), Utility.Random.Next(int.MaxValue).ToString("X"));
}
else if ((requiredCredential = RequiredCredentials.GetCredential(relativeLocation, "Basic")) != null)
{
authenticateHeader = "Basic realm=\"" + (string.IsNullOrWhiteSpace(requiredCredential.Domain) ? ServerName : requiredCredential.Domain + '"');
}
if (!string.IsNullOrWhiteSpace(authenticateHeader))
{
response.SetHeader(RtspHeaders.WWWAuthenticate, authenticateHeader);
}
}
else //Authorization header was present but data was incorrect
{
//Parse type from authHeader
string[] parts = authHeader.Split((char)Common.ASCII.Space);
string authType = null;
if (parts.Length > 0)
{
authType = parts[0];
authHeader = parts[1];
}
//should check to ensure wrong type was not used e.g. basic in place of digest...
if (string.Compare(authType, "digest", true) == 0)
{
//if (session.Storage["nOnce"] != null)
//{
// //Increment NonceCount
//}
}
//Increment session attempts?
statusCode = RtspStatusCode.Forbidden;
}
//Set the status code
response.StatusCode = statusCode;
//Send the response
ProcessInvalidRtspRequest(response, session, sendResponse);
}
