通过IP范围扫描子网

Question

通过将get_name和get_mac函数应用于指定的ip，可以估算网段的网络可用性：

#include <Winsock2.h>
#include <iphlpapi.h>
#include <cstdio>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

bool get_name(unsigned char* name, char dest[32])
{ 
struct in_addr destip;
struct hostent* info;

destip.s_addr = inet_addr(dest);

info = gethostbyaddr((char*)&destip, 4, AF_INET);

if (info != NULL)
{
    strcpy((char*)name, info->h_name);
}
else
{
    return false;
}

return true;
}

bool get_mac(unsigned char* mac, char dest[32])
{
struct in_addr destip;
ULONG mac_address[2];
ULONG mac_address_len = 6;

destip.s_addr = inet_addr(dest);

SendARP((IPAddr)destip.S_un.S_addr, 0, mac_address, &mac_address_len);

if (mac_address_len)
{
    BYTE* mac_address_buffer = (BYTE*)&mac_address;
    for (int i = 0; i < (int)mac_address_len; i++)
    {
        mac[i] = (char)mac_address_buffer[i];
    }
}
else
{
    return false;
}

return true;
}

int main()
{
   char address[][32] = { { "192.168.14.101" },{ "192.168.14.102" }, 
                         {"192.168.14.103" },{ "192.168.14.106 "} };
WSADATA sock;

if (WSAStartup(MAKEWORD(2, 2), &sock) != 0)
{
    printf("Failed to initialise winsock. (%d)\n", WSAGetLastError());
    return 1;
}

for (int i = 0; i < (int)sizeof(address) / 32; i++)
{
    unsigned char mac[6] = { '\0' };
    unsigned char name[100] = { '\0' };

    if (get_mac(mac, address[i]))
    {
        printf("%s : %s : %.2X-%.2X-%.2X-%.2X-%.2X-%.2X\n", address[i], 
 (get_name(name, address[i])) ? (char*)name : "-", mac[0], mac[1], mac[2], 
 mac[3], mac[4], mac[5]);
        fflush(stdout);
    }
 }

printf("\nDone.\n");
fflush(stdout);
system("PAUSE");

return 0;
}

尝试实现一个程序，该程序扫描子网并在网络上显示ip，主机名，mac机。困难在于我无法设置ip子网的整个范围，除了这些数据之外，还有其他方法可以扫描打开的端口吗？