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SIP Stack with SIP Proxy - (VOIP)

, 11 Jun 2007
C# implementation of SIP
SIP_Proxy_demo.zip
SIP_Proxy_demo
SIP_Proxy_demo.suo
SIP_Proxy_demo
bin
Debug
LumiSoft.Net.dll
SIP_Proxy_demo.exe
SIP_Proxy_demo.vshost.exe
dep
LumiSoft.Net.dll
LumiSoft.Net.pdb
Properties
Settings.settings
Resources
add.ico
app.ico
delete.ico
edit.ico
error.ico
info.ico
refresh.ico
rule.ico
server_running.ico
server_stopped.ico
viewmessages.ico
Stack.zip
Net
docs
dns
dns_records.jpg
dns_records.vsd
Net
_junk
_Obsolete
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
RTP
SDP
ServersCore
SIP
Client
Message
Proxy
Stack
SMTP
Client
Server
STUN
Client
Message
URI
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;

using LumiSoft.Net.SIP.Message;
using LumiSoft.Net.SIP.Stack;

namespace LumiSoft.Net.SIP.Proxy
{
    /// <summary>
    /// Holds SIP registration info.
    /// </summary>
    public class SIP_Registration
    {        
        private DateTime                      m_RegisterTime;
        private string                        m_Address   = "";
        private string                        m_UserName  = "";
        private List<SIP_RegistrationContact> m_pContacts = null;

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="userName">User name what owns registration.</param>
        /// <param name="address">Address what registration holds. (This is To: address of record value.)</param>
        public SIP_Registration(string userName,string address)
        {
            m_UserName = userName;
            m_Address  = address; 

            m_RegisterTime = DateTime.Now;
            m_pContacts = new List<SIP_RegistrationContact>();
        }


        #region method GetContact

        /// <summary>
        /// Gets registration contact with specified URI.
        /// </summary>
        /// <param name="uri"></param>
        /// <returns>Returns registration contact or null if no contact with specified URI.</returns>
        public SIP_RegistrationContact GetContact(string uri)
        {
            SIP_Uri sipUri = null;
            try{
                sipUri = SIP_Uri.Parse(uri);
            }
            catch{
            }

            // Find contact
            foreach(SIP_RegistrationContact contact in m_pContacts){
                // SIP URI
                if(sipUri != null){
                    if(contact.Contact.Address.IsSipOrSipsUri && SIP_Uri.Parse(contact.Contact.Address.Uri).Equals(sipUri)){
                        return contact;
                    }
                }
                // non sip URI, just compre it as string.
                else{
                    if(uri == contact.Contact.Address.Uri){
                        return contact;
                    }
                }
            }

            return null;
        }

        #endregion

        #region method UpdateContacts

        /// <summary>
        /// Updates registration contacts.
        /// </summary>
        /// <param name="contacts">SIP contacts to add/update.</param>
        /// <param name="expires">This is register request header field Expires: value and used only if contact doesn't have expires parameter.</param>
        /// <param name="minExpires">SIP server minimum expire time in seconds.</param>
        /// <param name="localEP">SIP proxy local end point info what accpeted this contact registration.</param>
        public void UpdateContacts(SIP_t_ContactParam[] contacts,int expires,int minExpires,SIP_EndPointInfo localEP)
        {
            lock(m_pContacts){
                foreach(SIP_t_ContactParam contact in contacts){
                    // Handle special value STAR Contact:, this means that we need to remove all contacts.
                    if(contact.IsStarContact){
                        m_pContacts.Clear();
                        return;
                    }
                                        
                    SIP_RegistrationContact currentContact = GetContact(contact.Address.Uri);
                    
                    // Get contact expire time. 
                    int contactExpires = contact.Expires;
                    if(contactExpires == -1){
                        contactExpires = expires;
                    }
                    if(contactExpires == -1){
                        contactExpires = minExpires;
                    }

                    // Remove specified contact
                    if(contactExpires == 0){
                        if(currentContact != null){
                            m_pContacts.Remove(currentContact);
                        }
                    }
                    // Add
                    else if(currentContact == null){
                        m_pContacts.Add(new SIP_RegistrationContact(contact,contactExpires,localEP));
                    }
                    // Update
                    else{
                        currentContact.UpdateContact(contact,contactExpires,localEP);
                    }
                }
            }
        }

        #endregion

        #region method RemoveExpiredContacts

        /// <summary>
        /// Removes all contacts what has been expired.
        /// </summary>
        public void RemoveExpiredContacts()
        {
            lock(m_pContacts){
                for(int i=0;i<m_pContacts.Count;i++){
                    if(m_pContacts[i].IsExpired){
                        m_pContacts.RemoveAt(i);
                        i--;
                    }
                }
            }
        }

        #endregion

        #region method RemoveAllContacts

        /// <summary>
        /// Removes all regiostration contacts.
        /// </summary>
        public void RemoveAllContacts()
        {
            lock(m_pContacts){
                m_pContacts.Clear();
            }
        }

        #endregion


        #region Properties Implementation

        /// <summary>
        /// Gets SIP address what is used for registration mapping. (This is To: address of record value.)
        /// For example: ivar@lumisoft.ee.
        /// </summary>
        public string Address
        {
            get{ return m_Address; }
        }

        /// <summary>
        /// Gets authenticated user name who made register. This available only if server required auth for registration 
        /// and user authenticated.
        /// </summary>
        public string UserName
        {
            get{ return m_UserName; }
        }

        /// <summary>
        /// Gets registration name registered contacts. NOTE: Contacts are in priority order.
        /// </summary>
        public SIP_RegistrationContact[] Contacts
        {
            get{ 
                lock(m_pContacts){
                    SIP_RegistrationContact[] retVal = m_pContacts.ToArray();
                                                            
                    // Sort by qvalue, higer qvalue means higher priority.
                    Array.Sort(retVal);
                                        
                    return retVal; 
                }
            }
        }

        /// <summary>
        /// Gets sip and sip contacts.
        /// </summary>
        public SIP_Uri[] SipContacts
        {
            get{                
                // Filter out SIP contacts, sort them by qvalue.
                List<SIP_Uri> retVal = new List<SIP_Uri>();
                foreach(SIP_RegistrationContact contact in this.Contacts){
                    if(contact.Contact.Address.IsSipUri || contact.Contact.Address.IsSecureSipUri){
                        retVal.Add(SIP_Uri.Parse(contact.Contact.Address.Uri));
                    }
                }
 
                return retVal.ToArray(); 
            }
        }

        #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
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Web04 | 2.8.140921.1 | Last Updated 11 Jun 2007
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