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STUN Client

, 20 Apr 2007
STUN client C# implementation with sample application
Stun.zip
Stun
Net
docs
dns
dns_records.jpg
dns_records.vsd
Net
_junk
_Obsolete
_Stuff
AUTH
bin
Release
LumiSoft.Net.dll
Data
Dns
Client
FTP
Client
Server
HTTP
Server
ICMP
IMAP
Client
Server
IO
Log
LumiSoft.Net
Mime
vCard
Net.csproj.user
Net.suo
NNTP
Client
POP3
Client
Server
SDP
ServersCore
SIP
Client
Message
Proxy
Stack
SMTP
Client
Server
STUN
Client
Message
STUN_Client_app
STUN_Client_app.suo
STUN_Client_app
bin
Debug
LumiSoft.Net.dll
STUN_Client_app.exe
STUN_Client_app.vshost.exe
dep
LumiSoft.Net.dll
Properties
Settings.settings
using System;
using System.Collections.Generic;
using System.Text;

namespace LumiSoft.Net.SIP.Message
{
    /// <summary>
    /// Implements SIP "Cseq" value. Defined in RFC 3261.
    /// A CSeq in a request contains a single decimal sequence number and 
    /// the request method. The method part of CSeq is case-sensitive. The CSeq header 
    /// field serves to order transactions within a dialog, to provide a means to uniquely 
    /// identify transactions, and to differentiate between new requests and request retransmissions.
    /// </summary>
    /// <remarks>
    /// <code>
    /// RFC 3261 Syntax:
    ///     CSeq = 1*DIGIT LWS Method
    /// </code>
    /// </remarks>
    public class SIP_t_CSeq : SIP_t_Value
    {
        private int    m_SequenceNumber = 1;
        private string m_RequestMethod  = "";

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="value">CSeq: header field value.</param>
        public SIP_t_CSeq(string value)
        {
            Parse(new StringReader(value));
        }

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="sequenceNumber">Command sequence number.</param>
        /// <param name="requestMethod">Request method.</param>
        public SIP_t_CSeq(int sequenceNumber,string requestMethod)
        {
            m_SequenceNumber = sequenceNumber;
            m_RequestMethod  = requestMethod;
        }


        #region method Parse

        /// <summary>
        /// Parses "CSeq" from specified value.
        /// </summary>
        /// <param name="value">SIP "CSeq" value.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>value</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public void Parse(string value)
        {
            if(value == null){
                throw new ArgumentNullException("value");
            }

            Parse(new StringReader(value));
        }

        /// <summary>
        /// Parses "CSeq" from specified reader.
        /// </summary>
        /// <param name="reader">Reader from where to parse.</param>
        /// <exception cref="ArgumentNullException">Raised when <b>reader</b> is null.</exception>
        /// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
        public override void Parse(StringReader reader)
        {
            // CSeq = 1*DIGIT LWS Method

            if(reader == null){
                throw new ArgumentNullException("reader");
            }

            // Get sequence number
            string word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("Invalid 'CSeq' value, sequence number is missing !");
            }
            try{
                m_SequenceNumber = Convert.ToInt32(word);
            }
            catch{
                throw new SIP_ParseException("Invalid CSeq 'sequence number' value !");
            }

            // Get request method
            word = reader.ReadWord();
            if(word == null){
                throw new SIP_ParseException("Invalid 'CSeq' value, request method is missing !");
            }
            m_RequestMethod = word;
        }

        #endregion

        #region method ToStringValue

        /// <summary>
        /// Converts this to valid "CSeq" value.
        /// </summary>
        /// <returns>Returns "CSeq" value.</returns>
        public override string ToStringValue()
        {
            return m_SequenceNumber + " " + m_RequestMethod;
        }

        #endregion


        #region Properties Implementation
                
        /// <summary>
        /// Gets or sets sequence number.
        /// </summary>
        public int SequenceNumber
        {
            get{ return m_SequenceNumber; }

            set{
                if(value < 1){
                    throw new ArgumentException("Property SequenceNumber value must be >= 1 !");
                }

                m_SequenceNumber = value;
            }
        }

        /// <summary>
        /// Gets or sets request method. Note: this value is case-sensitive !
        /// </summary>
        public string RequestMethod
        {
            get{ return m_RequestMethod; }

            set{
                if(string.IsNullOrEmpty(value)){
                    throw new ArgumentException("Property RequestMethod value can't be null or empty !");
                }

                m_RequestMethod = value;
            }
        }

        #endregion

    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ivar Lumi

Estonia Estonia
No Biography provided

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