/// <summary>
/// Checks if SIP response has all required values as response line,header fields and their values.
/// Throws Exception if not valid SIP response.
/// </summary>
public void Validate()
{
// Via: + branch prameter
// To:
// From:
// CallID:
// CSeq
if (Via.GetTopMostValue() == null)
{
throw new SIP_ParseException("Via: header field is missing !");
}
if (Via.GetTopMostValue().Branch == null)
{
throw new SIP_ParseException("Via: header fields branch parameter is missing !");
}
if (To == null)
{
throw new SIP_ParseException("To: header field is missing !");
}
if (From == null)
{
throw new SIP_ParseException("From: header field is missing !");
}
if (CallID == null)
{
throw new SIP_ParseException("CallID: header field is missing !");
}
if (CSeq == null)
{
throw new SIP_ParseException("CSeq: header field is missing !");
}
// TODO: INVITE 2xx must have only 1 contact header with SIP or SIPS.
}
/// <summary>
/// Checks if SIP request has all required values as request line,header fields and their values.
/// Throws Exception if not valid SIP request.
/// </summary>
public void Validate()
{
// Request SIP version
// Via: + branch prameter
// To:
// From:
// CallID:
// CSeq
// Max-Forwards RFC 3261 8.1.1.
if (!RequestLine.Version.ToUpper().StartsWith("SIP/2.0"))
{
throw new SIP_ParseException("Not supported SIP version '" + RequestLine.Version + "' !");
}
if (Via.GetTopMostValue() == null)
{
throw new SIP_ParseException("Via: header field is missing !");
}
if (Via.GetTopMostValue().Branch == null)
{
throw new SIP_ParseException("Via: header field branch parameter is missing !");
}
if (To == null)
{
throw new SIP_ParseException("To: header field is missing !");
}
if (From == null)
{
throw new SIP_ParseException("From: header field is missing !");
}
if (CallID == null)
{
throw new SIP_ParseException("CallID: header field is missing !");
}
if (CSeq == null)
{
throw new SIP_ParseException("CSeq: header field is missing !");
}
if (MaxForwards == -1)
{
// We can fix it by setting it to default value 70.
MaxForwards = 70;
}
/* RFC 3261 12.1.2
* When a UAC sends a request that can establish a dialog (such as an INVITE) it MUST
* provide a SIP or SIPS URI with global scope (i.e., the same SIP URI can be used in
* messages outside this dialog) in the Contact header field of the request. If the
* request has a Request-URI or a topmost Route header field value with a SIPS URI, the
* Contact header field MUST contain a SIPS URI.
*/
if (SIP_Utils.MethodCanEstablishDialog(RequestLine.Method))
{
if (Contact.GetAllValues().Length == 0)
{
throw new SIP_ParseException(
"Contact: header field is missing, method that can establish a dialog MUST provide a SIP or SIPS URI !");
}
if (Contact.GetAllValues().Length > 1)
{
throw new SIP_ParseException(
"There may be only 1 Contact: header for the method that can establish a dialog !");
}
if (!Contact.GetTopMostValue().Address.IsSipOrSipsUri)
{
throw new SIP_ParseException(
"Method that can establish a dialog MUST have SIP or SIPS uri in Contact: header !");
}
}
// TODO: Invite must have From:/To: tag
// TODO: Check that request-Method equals CSeq method
// TODO: PRACK must have RAck and RSeq header fields.
// TODO: get in transport made request, so check if sips and sip set as needed.
}