判断两个ip地址是否在同一子网内

最新推荐文章于 2025-06-01 17:31:45 发布

lishengyaupc

最新推荐文章于 2025-06-01 17:31:45 发布

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分类专栏： C/C++ 试题

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该程序使用C++实现，通过将IP地址转换为整数数组并应用子网掩码来判断两个IP地址是否属于同一子网。主要功能包括：将IP地址字符串转化为整数数组，比较两个IP地址在应用子网掩码后的前缀是否相同，从而确定它们是否在同一子网内。

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#include <iostream>
#include <cstring>
#include <cstdlib>

using namespace std;

bool Addr_to_Array(char* addr, int* array)
{
   bool ret = (addr != NULL );
   char* sub = NULL;
   int i = 0;

   if( ret)
   {
       sub = strtok(addr,"."); // 分割字符串

       while(sub != NULL)
       {
           array[i] = atoi(sub); // 字符串变为整数
           i++;
           sub = strtok(NULL,".");
       }

   }

   return ret;

}

int checkNetSegment(char* mask_addr, char* ip1_addr, char* ip2_addr)
{
   bool ret = true;

   int add[4] = {0};
   int p1[4] = {0};
   int p2[4] = {0};

   ret = ret && Addr_to_Array(mask_addr, add);
   ret = ret && Addr_to_Array(ip1_addr, p1);
   ret = ret && Addr_to_Array(ip2_addr, p2);

   if(ret)
   {
       for(int i=0; i<4; i++)
       {
           if( (p1[i] & add[i]) == (p2[i] & add[i]) )
           {
               if( i == 3)
               {
                   //cout << "ip1 and ip2 are in the same netsegment." << endl;
               }
                   continue;
           }
           else
           {
               //cout << "ip1 and ip2 are not in the same netsegment." << endl;
               ret = false;
               break;
           }
       }
   }

   return ret; //static_cast<int>(ret);

}

int main()
{
   char mask_addr[] = "255.255.255.0";
   char ip1_addr[] = "192.168.1.120";
   char ip2_addr[] = "192.168.1.128";

   int ret = checkNetSegment(mask_addr, ip1_addr, ip2_addr);

   if( 1 == ret )
   {
       cout << "ip1 and ip2 are in the same netsegment." << endl;
   }
   else
   {
       cout << "ip1 and ip2 are not in the same netsegment." << endl;
   }

return 0;
}