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PacketDumpUdp.cpp
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93 lines (84 loc) · 3.25 KB
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/*
* 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 "IpFragmentMap.h"
#include "MemoryDebug.h"
/**
* @ingroup SipCallDump
* @brief UDP 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 PacketDumpUdp( pcap_t * psttPcap, struct pcap_pkthdr * psttHeader, const u_char * pszData, Ip4Header * psttIp4Header, int iIpPos, int iIpHeaderLen )
{
UdpHeader * psttUdpHeader = (UdpHeader *)( pszData + iIpPos + iIpHeaderLen );
char * pszUdpBody = (char *)( pszData + iIpPos + iIpHeaderLen + 8 );
int iUdpBodyLen = psttHeader->caplen - ( iIpPos + iIpHeaderLen + 8 );
if( iUdpBodyLen <= MIN_UDP_BODY_SIZE ) return;
if( IsRtpPacket( pszUdpBody, iUdpBodyLen ) )
{
gclsRtpMap.Insert( psttHeader, pszData, psttIp4Header, psttUdpHeader );
}
else
{
bool bEnd;
// fragment 처리
if( gclsIpFragmentMap.Insert( psttIp4Header, (char *)pszData + iIpPos + iIpHeaderLen, psttHeader->caplen - ( iIpPos + iIpHeaderLen ), bEnd ) )
{
if( bEnd == false ) return;
CIpPacket clsPacket;
if( gclsIpFragmentMap.Delete( psttIp4Header, &clsPacket ) == false )
{
CLog::Print( LOG_ERROR, "%s gclsIpFragmentMap.Delete() error", __FUNCTION__ );
return;
}
Ip4Header * psttIp4Header = (Ip4Header *)( clsPacket.m_pszPacket );
int iIpHeaderLen = GetIpHeaderLength( psttIp4Header );
pszUdpBody = (char *)( clsPacket.m_pszPacket + iIpHeaderLen + 8 );
iUdpBodyLen = clsPacket.m_iPacketLen - ( iIpHeaderLen + 8 );
if( IsSipPacket( pszUdpBody, iUdpBodyLen ) )
{
u_char * pszNewData = (u_char *)malloc( iIpPos + clsPacket.m_iPacketLen );
if( pszNewData == NULL )
{
CLog::Print( LOG_ERROR, "%s new data malloc error", __FUNCTION__ );
}
else
{
memcpy( pszNewData, pszData, iIpPos );
memcpy( pszNewData + iIpPos, clsPacket.m_pszPacket, clsPacket.m_iPacketLen );
psttHeader->caplen = iIpPos + clsPacket.m_iPacketLen;
psttHeader->len = psttHeader->caplen;
gclsCallMap.Insert( psttPcap, psttHeader, pszNewData, pszUdpBody, iUdpBodyLen );
free( pszNewData );
}
}
}
else if( IsSipPacket( pszUdpBody, iUdpBodyLen ) )
{
gclsCallMap.Insert( psttPcap, psttHeader, pszData, pszUdpBody, iUdpBodyLen );
}
}
}