/*

* Copyright (C) 2012 Yee Young Han <websearch@naver.com> (http://blog.naver.com/websearch)

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation; either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/

#include "SipPlatformDefine.h"

#include "Log.h"

#include "SipCallMap.h"

#include "RtpMap.h"

#include "TcpMap.h"

#include "IpFragmentMap.h"

#include "SipCallDumpSetup.h"

#include "MemoryDebug.h"

/**

* @ingroup SipCallDump

* @brief TCP 패킷을 분석한다.

* @param psttPcap pcap_t 포인터

* @param psttHeader pcap_pkthdr 포인터

* @param pszData 패킷

* @param psttIp4Header IPv4 헤더

* @param iIpPos IP 헤더 위치

* @param iIpHeaderLen IP 헤더 길이

*/

void PacketDumpTcp( pcap_t * psttPcap, struct pcap_pkthdr * psttHeader, const u_char * pszData, Ip4Header * psttIp4Header, int iIpPos, int iIpHeaderLen )

{

TcpHeader * psttTcpHeader = (TcpHeader *)( pszData + iIpPos + iIpHeaderLen );

if( ( psttTcpHeader->flags & TCP_SYN ) && !( psttTcpHeader->flags & TCP_ACK ) )

{

return;

}

else if( ( psttTcpHeader->flags & TCP_FIN ) || ( psttTcpHeader->flags & TCP_RST ) )

{

return;

}

uint16_t sSrcPort = ntohs( psttTcpHeader->sport );

uint16_t sDstPort = ntohs( psttTcpHeader->dport );

// 설정 파일에 설정된 SIP 포트 번호가 아니면 무시한다.

if( gclsSetup.IsTcpSipPort( sSrcPort ) == false && gclsSetup.IsTcpSipPort( sDstPort ) == false ) return;

int iTcpHeaderLen = GetTcpHeaderLength( psttTcpHeader );

int iTcpBodyPos = iIpPos + iIpHeaderLen + iTcpHeaderLen;

char * pszTcpBody = (char *)( pszData + iTcpBodyPos );

int iTcpBodyLen = psttHeader->caplen - iTcpBodyPos;

// TCP body len 이 0 이면 무시한다.

if( iTcpBodyLen <= 0 ) return;

// IP fragment 된 TCP packet 은 현재 버전에서는 무시한다.

if( IsSipPacket( pszTcpBody, iTcpBodyLen ) )

{

gclsTcpMap.Insert( psttPcap, psttHeader, pszData, psttIp4Header, psttTcpHeader, iTcpBodyPos, iTcpBodyLen );

}

else

{

gclsTcpMap.Update( psttPcap, psttHeader, pszData, psttIp4Header, psttTcpHeader, iTcpBodyPos, iTcpBodyLen );

}

}