如何在Linux上获得C C 中的NET封装

How to get net encap in cc++ on linux?

本文关键字：中的 NET 封装 Linux      更新时间：2023-10-16

  • 使用C C 代码，Linux是否有办法获取有关所有网络适配器"链接封装：*****"的信息？我已经有IP地址和MAC地址之类的东西。

  • 这是IfConfig的样本输出：

    ethx  Link encap:Ethernet  HWaddr 00:0F:20:CF:8B:42
      inet addr:217.149.127.10  Bcast:217.149.127.63  Mask:255.255.255.192
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:2472694671 errors:1 dropped:0 overruns:0 frame:0
      TX packets:44641779 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000
      RX bytes:1761467179 (1679.8 Mb)  TX bytes:2870928587 (2737.9 Mb)
      Interrupt:28

请查看<net/if.h>

中的 ifreq 
/* Interface request structure used for socket ioctl's. All interface ioctl's must have
parameter definitions which begin with ifr_name. The remainder may be interface specific. */
struct ifreq
  {
# define IFHWADDRLEN 6
# define IFNAMSIZ IF_NAMESIZE
    union
      {
        char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "en0". */
      } ifr_ifrn;
    union
      {
        struct sockaddr ifru_addr;
        struct sockaddr ifru_dstaddr;
        struct sockaddr ifru_broadaddr;
        struct sockaddr ifru_netmask;
        struct sockaddr ifru_hwaddr;
        short int ifru_flags;
        int ifru_ivalue;
        int ifru_mtu;
        struct ifmap ifru_map;
        char ifru_slave[IFNAMSIZ]; /* Just fits the size */
        char ifru_newname[IFNAMSIZ];
         __caddr_t ifru_data;
      } ifr_ifru;
  };
# define ifr_name ifr_ifrn.ifrn_name /* interface name */
# define ifr_hwaddr ifr_ifru.ifru_hwaddr /* MAC address */
# define ifr_addr ifr_ifru.ifru_addr /* address */
# define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-p lnk */
# define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */
# define ifr_netmask ifr_ifru.ifru_netmask /* interface net mask */
# define ifr_flags ifr_ifru.ifru_flags /* flags */
# define ifr_metric ifr_ifru.ifru_ivalue /* metric */
# define ifr_mtu ifr_ifru.ifru_mtu /* mtu */
# define ifr_map ifr_ifru.ifru_map /* device map */
# define ifr_slave ifr_ifru.ifru_slave /* slave device */
# define ifr_data ifr_ifru.ifru_data /* for use by interface */
# define ifr_ifindex ifr_ifru.ifru_ivalue /* interface index */
# define ifr_bandwidth ifr_ifru.ifru_ivalue /* link bandwidth */
# define ifr_qlen ifr_ifru.ifru_ivalue /* queue length */
# define ifr_newname ifr_ifru.ifru_newname /* New name */
# define _IOT_ifreq _IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)
# define _IOT_ifreq_short _IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)
# define _IOT_ifreq_int _IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)
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