Linux系统下程序如何获得系统所有网卡的信息

gomo1234

问题如标题所示：

在Linux系统里，程序使用socket编程，如何获得系统所有网卡的信息：如IP，MAC或别名（eth0/eth1）等。

非常感谢

zhuhefang2006

unp chapter18 Routing Sockets好像有涉及这方面的内容
建议楼主去看一下

duanjigang

这里的netlink是一个获取NIC列表的例子，内核代码获取的。。。
http://bbs.chinaunix.net/viewthr ... page%3D1#pid9328873
另外，网上有一堆用socket代码实现这个的
不过我还是建议楼主看看net-tools中的ifconfig的源代码

[ 本帖最后由 duanjigang 于 2009-1-6 20:25 编辑 ]

duanjigang

找来了一个代码，你自己改改吧，适用OS：linux, freebsd, solaris.

int GetMacIP(char MAC[], char IP[]) {  register int fd, intrface, retn = 0;    register int up, ip, mac;    struct ifreq buf[MAX_NET_CARDS];    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))          {            intrface = ifc.ifc_len / sizeof (struct ifreq);            while (intrface-- > 0)            {                 up = mac = ip = 0;                  //Judge whether the net card status is up                if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface])))                {                  if (buf[intrface].ifr_flags & IFF_PROMISC)                  {                   // puts ("the interface is PROMISC");                  }                }            if (buf[intrface].ifr_flags & IFF_UP)                    {                              up = 1;                    }                //Get IP of the net card                if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))                    {                       //get ip address                        memset(IP, 0, 20);                        sprintf(IP, "%s",                        (char*)inet_ntoa(((struct sockaddr_in*)                        (&buf[intrface].ifr_addr))->sin_addr));                     // printf("IP %s\n",IP);                        ip = 1;                    }               #ifdef __sun__                   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)))                    {                         mac = 1;                         //Get HW address                         memset(MAC, '\0', 20);                    sprintf(MAC ,"%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]);                    }                #else          #if 0               //Get HW ADDRESS of the net card               if (!(ioctl (fd,  SIOCGENADDR, (char *) &buf[intrface])))                   {                    mac = 1;                    memset(MAC, '\0', 20);                    sprintf(MAC, "%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]);                    }               #endif           if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))                  {                     mac = 1;                     memset(MAC, 0, 20);                  sprintf(MAC, "%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]);                   // printf("MAC %s\n", MAC);                  }           #endif           if(ip  && mac  && up )                   {                           close(fd);                           return 1;                   }                   }//end of while()       } //end of ioctl()    } //end of if socket        close (fd);        return 0; }

emmoblin

使用ioctl系统调用。
或者看一下ifconfig的源代码

gomo1234

谢谢各位，问题解决了！