vc++Ping命令模拟进阶----如何嗅探某个IP段

这次我将代码整合后，做一个实战的练习，扫描一个IP段，返回所有活动的IP

要完成这个练习，以下有几个步骤，作为程序员的我们就用代码说话
首先要做到如何证明一个IP是否在活动，代码如下
Java代码
BOOL IpCheck::IsIPActive(char *addr)
{
    // 目的IP地址，即要Ping的IP地址
    char *szDestIp = addr; // 127.0.0.1

    // 创建原始套节字
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);
    SOCKET sRaw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

    // 设置接收超时
    SetTimeout(sRaw, 100, TRUE);

    // 设置目的地址
    SOCKADDR_IN dest;
    dest.sin_family = AF_INET;
    dest.sin_port = htons(0);
    dest.sin_addr.S_un.S_addr = inet_addr(szDestIp);

    // 创建ICMP封包
    char buff[sizeof(ICMP_HDR) + 32];
    ICMP_HDR* pIcmp = (ICMP_HDR*)buff;

    // 填写ICMP封包数据，请求一个ICMP回显
    pIcmp->icmp_type = 8;
    pIcmp->icmp_code = 0;
    pIcmp->icmp_id = (USHORT)GetCurrentProcessId();
    pIcmp->icmp_checksum = 0;
    pIcmp->icmp_sequence = 0;

    // 填充数据部分，可以为任意
    memset(&buff[sizeof(ICMP_HDR)], 'E', 32);

    // 开始发送和接收ICMP封包
    USHORT nSeq = 0;
    char recvBuf[1024];
    SOCKADDR_IN from;
    int nLen = sizeof(from);

    static int nCount = 0;
    int nRet;

    pIcmp->icmp_checksum = 0;
    pIcmp->icmp_timestamp = GetTickCount();
    pIcmp->icmp_sequence = nSeq++;
    pIcmp->icmp_checksum = checksum((USHORT*)buff, sizeof(ICMP_HDR) + 32);
    nRet = sendto(sRaw, buff, sizeof(ICMP_HDR) + 32, 0, (SOCKADDR *)&dest, sizeof(dest));
    if(nRet == SOCKET_ERROR)
    {
        printf(" sendto() failed: %d \n", ::WSAGetLastError());
        return -1;
    }
    nRet = recvfrom(sRaw, recvBuf, 1024, 0, (sockaddr*)&from, &nLen);
    if(nRet == SOCKET_ERROR)
    {
        if(WSAGetLastError() == WSAETIMEDOUT)
        {
            printf("%s timed out\n", addr);
            return FALSE;
        }
        printf("recvfrom() failed: %d\n", WSAGetLastError());
        return FALSE;
    }

    // 下面开始解析接收到的ICMP封包
    int nTick = ::GetTickCount();
    if(nRet < sizeof(IPHeader) + sizeof(ICMP_HDR))
    {
        printf(" Too few bytes from %s \n", inet_ntoa(from.sin_addr));
    }

    // 接收到的数据中包含IP头，IP头大小为20个字节，所以加20得到ICMP头
    // (ICMP_HDR*)(recvBuf + sizeof(IPHeader));
    ICMP_HDR* pRecvIcmp = (ICMP_HDR*)(recvBuf + 20);
    if(pRecvIcmp->icmp_type == ICMP_TYPE_REACH_FAIL)    // 回显
    {
        printf("%s reach fail, type %d recvd \n", addr, pRecvIcmp->icmp_type);
        return FALSE;
    }

    if(pRecvIcmp->icmp_id != GetCurrentProcessId())
    {
        printf(" someone else's packet! \n");
        return FALSE;
    }

    printf("从 %s 返回 %d 字节:", addr,nRet);
    printf(" 数据包序列号 = %d. \t", pRecvIcmp->icmp_sequence);
    printf(" 延时大小: %d ms", nTick - pRecvIcmp->icmp_timestamp);
    printf(" \n");

    s_array->Insert(addr);

    WSACleanup();
    closesocket(sRaw);

    return TRUE;
}

这个是扫描一个指定的IP地址，但是我们想要扫描多个IP地址的话，必须对IP地址进行转化，转化为整数就可以进行累加操作
Java代码
unsigned long __fastcall IpCheck::InvertIp(unsigned long NormalIp)
{
    unsigned   char   b1,b2,b3,b4;

补充：软件开发 , Vc ,