linux获取本机网卡ip地址

#include <stdio.h>;
#include <sys/types.h>;
#include <sys/socket.h>;
#include <sys/ioctl.h>;
#include <netinet/in.h>;
#include <net/if.h>;
#include <net/if_arp.h>;
#include <arpa/inet.h>;
#include <errno.h>;

#define ETH_NAME "eth0"

int main()
{
int sock;
struct sockaddr_in sin;
struct ifreq ifr;

sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == -1)
{
perror("socket");
return -1;
}

strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1] = 0;

if (ioctl(sock, SIOCGIFADDR, &ifr) < 0)
{
perror("ioctl");
return -1;
}

memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
fprintf(stdout, "eth0: %s\n", inet_ntoa(sin.sin_addr));

return 0;

}

上面的代码需要在宏里指定要获取的网卡名。

下面的代码可以获取到所有的网卡信息。

#include <stdio.h> #include <sys/types.h> #include <sys/param.h>#include <sys/ioctl.h> #include <sys/socket.h> #include <net/if.h> #include <netinet/in.h> #include <net/if_arp.h>#ifdef SOLARIS #include <sys/sockio.h> #endif#define MAXINTERFACES   16main (argc, argv) register int argc; register char *argv[]; {    register int fd, intrface, retn = 0;    struct ifreq buf[MAXINTERFACES];    struct arpreq arp;    struct ifconf ifc; if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0)  {   ifc.ifc_len = sizeof buf;   ifc.ifc_buf = (caddr_t) buf;   if (!ioctl (fd, SIOCGIFCONF, (char *) &ifc))   {    //获取接口信息   intrface = ifc.ifc_len / sizeof (struct ifreq);     printf("interface num is intrface=%d\n\n\n",intrface);    //根据借口信息循环获取设备IP和MAC地址   while (intrface-- > 0)    {     //获取设备名称    printf ("net device %s\n", buf[intrface].ifr_name);      //判断网卡类型     if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface])))     {      if (buf[intrface].ifr_flags & IFF_PROMISC)      {       puts ("the interface is PROMISC");       retn++;      }     }     else     {      char str[256];     sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);      perror (str);     }   //判断网卡状态             if (buf[intrface].ifr_flags & IFF_UP)    {                 puts("the interface status is UP");             }             else    {                 puts("the interface status is DOWN");             }   //获取当前网卡的IP地址             if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))             {                  puts ("IP address is:");                  puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));                  puts("");                    //puts (buf[intrface].ifr_addr.sa_data);             }             else    {                char str[256];               sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);                perror (str);            } /* this section can't get Hardware Address,I don't know whether the reason is module driver*/ #ifdef SOLARIS    //获取MAC地址            arp.arp_pa.sa_family = AF_INET;             arp.arp_ha.sa_family = AF_INET;             ((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;             if (!(ioctl (fd, SIOCGARP, (char *) &arp)))             {                  puts ("HW address is:");    //以十六进制显示MAC地址                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",                                 (unsigned char)arp.arp_ha.sa_data[0],                                 (unsigned char)arp.arp_ha.sa_data[1],                                 (unsigned char)arp.arp_ha.sa_data[2],                                 (unsigned char)arp.arp_ha.sa_data[3],                                 (unsigned char)arp.arp_ha.sa_data[4],                                 (unsigned char)arp.arp_ha.sa_data[5]);                 puts("");                  puts("");             }#else #if 0    /*Get HW ADDRESS of the net card */             if (!(ioctl (fd,  SIOCGENADDR, (char *) &buf[intrface])))             {                  puts ("HW address is:");                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",                                 (unsigned char)buf[intrface].ifr_enaddr[0],                                 (unsigned char)buf[intrface].ifr_enaddr[1],                                 (unsigned char)buf[intrface].ifr_enaddr[2],                                 (unsigned char)buf[intrface].ifr_enaddr[3],                                 (unsigned char)buf[intrface].ifr_enaddr[4],                                 (unsigned char)buf[intrface].ifr_enaddr[5]);                 puts("");                  puts("");             } #endif             if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))             {                  puts ("HW address is:");                 printf("%02x:%02x:%02x:%02x:%02x:%02x\n",                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[0],                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[1],                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[2],                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[3],                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[4],                                 (unsigned char)buf[intrface].ifr_hwaddr.sa_data[5]);                 puts("");                  puts("");              } #endif            else    {                char str[256];               sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);                perror (str);            }         } //while      } else          perror ("cpm: ioctl");   } else       perror ("cpm: socket");    close (fd);     return retn; }