使用Socket修改IP地址

设置本地计算机ip地址

setip.c

#include 

#include 

#include 

#include 

#include   {

                                              / * Interface name */
           char                              ifr_name[IFNAMSIZ];

           union {
                   struct sockaddr    ifr_addr;
                   struct sockaddr    ifr_dstaddr;
                   struct sockaddr    ifr_broadaddr;
                   struct sockaddr    ifr_netmask;
                   struct sockaddr    ifr_hwaddr;
                   short                      ifr_flags;
                   int                           ifr_ifindex;
                   int                           ifr_metric;
                   int                           ifr_mtu;
                   struct ifmap              ifr_map;
                   char                        ifr_slave[IFNAMSIZ];
                   char                        ifr_newname[IFNAMSIZ];
                   char *                     ifr_data;
           };
       };

  {
        unsigned short sa_family;   //族, AF_xxx    AF_INET 不涉及转序的问题
        char sa_data[14];    // 14字节的地址 字节顺序的
    };
   
上面是通用的socket地址，共16个字节！

具体到Internet socket，用下面的结构，二者可以进行类型转换
struct sockaddr_in {
        short int sin_family; /* 地址族 */
        unsigned short int sin_port; /* 端口号 */
       struct in_addr sin_addr; /* Internet地址 */
        unsigned char sin_zero[8]; /* 与struct sockaddr一样的长度 */ 16个字节
    };

 

 

{

#include string.h

#include sys/socket.h

#include sys/ioctl.h

#include stdio.h

#include arpa/inet.h

#include netinet/in.h

#include net/if.h

        #include net/if_arp.h

      }