moicmp.cpp

MONA是为数不多的C++语言编写的一个很小的操作系统

/*!
    \file   MoIcmp.cpp
    \brief  ICMP僾儘僩僐儖幚憰僋儔僗

    Copyright (c) 2004 Yamami
    All rights reserved.
    License=MIT/X License

    \author  Yamami
    \version $Revision: 1.1 $
    \date   create:2004/09/20 update:$Date: 2004/09/20 15:29:03 $
*/

/*! \class MoIcmp
 *  \brief ICMP僾儘僩僐儖幚憰僋儔僗
 */



#include "MoIcmp.h"
#include "MonesConfig.h"
#include "MonesGlobal.h"

/*!
    \brief initialize
         MoIcmp 僐儞僗僩儔僋僞
    \author Yamami
    \date   create:2004/09/20 update:
*/
MoIcmp::MoIcmp()
{

}

/*!
    \brief initialize
         MoIcmp initIp
    \author Yamami
    \param  AbstractMonic *pminsNic [in] NIC僋儔僗傊偺億僀儞僞
    \date   create:2004/09/20 update:
*/
void MoIcmp::initIp(AbstractMonic *pminsNic ) 
{
    //NIC僋儔僗傪曐帩
    insAbstractNic = pminsNic;
    return;
}


/*!
    \brief initialize
         MoIcmp 僨僗僋僩儔僋僞
    \author Yamami
    \date   create:2004/08/20 update:
*/
MoIcmp::~MoIcmp() 
{

}


/*!
    \brief receiveIcmp
         ICMP僾儘僩僐儖庴怣 張棟
    \param  IP_HEADER *ipHead [in] IP僿僢僟傊偺億僀儞僞
    \return int 寢壥 
        
    \author Yamami
    \date   create:2004/09/20 update:2004/09/20
*/
int MoIcmp::receiveIcmp(IP_HEADER *ipHead)
{
    int icmp_size;
    ICMP_HEADER *icmp;

    icmp=(ICMP_HEADER*)ipHead->data;

    icmp_size=MoPacUtl::swapShort(ipHead->len)-sizeof(IP_HEADER);

    /* 僠僃僢僋僒儉偺妋擣丅 */
    if(MoPacUtl::calcCheckSum((dword*)icmp,icmp_size)){
        return 0;
    }


    switch(icmp->type)
    {
        case ICMP_TYPE_ECHOREQ:
            transIcmp(ipHead->srcip,ICMP_TYPE_ECHOREP,0,icmp,icmp_size);
            break;
        case ICMP_TYPE_ECHOREP:
            //return saveRecv(ipHead,icmp_size+sizeof(IP_HEADER));
            break;
    }

    return 0;
}


/*!
    \brief transIcmp
         ICMP憲怣 張棟
    \param  word dstip [in] 憲怣愭IP傾僪儗僗
    \param  byte type [in] ICMP僞僀僾
    \param  ICMP_HEADER *icmpHead [in] IP僿僢僟傊偺億僀儞僞
    \param  int size [in] 僷働僢僩僒僀僘
    \return int 寢壥 
        
    \author Yamami
    \date   create:2004/09/20 update:2004/09/20
*/
void MoIcmp::transIcmp(dword dstip, byte type, byte code, ICMP_HEADER *icmpHead, int size)
{
    TRANS_BUF_INFO tbi;

    //ICMP僿僢僟乕偺愝掕
    icmpHead->type=type;
    icmpHead->code=code;
    icmpHead->chksum=0;
    icmpHead->chksum=MoPacUtl::calcCheckSum((dword*)icmpHead,size);

    //憲怣僶僢僼傽僥乕僽儖偺愝掕
    tbi.data[2]=NULL;
    tbi.size[2]=0;
    tbi.data[1]=(char*)icmpHead;
    tbi.size[1]=size;
    tbi.ipType=IPPROTO_ICMP;

    g_MoIp->transIp(&tbi,dstip,0,0);
}