linux获得网卡信息

 1 #define MAX_INTERFACE         64
 2 
 3 int showifs()
 4 {
 5     int i;
 6     int rc;
 7     int sock;
 8     int ifnum;
 9     struct ifreq ifr[MAX_INTERFACE];
10 //    struct arpreq arp;
11     struct ifconf ifc;
12 
13     sock = socket ( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
14     if ( sock == -1 )
15     {
16         return -1;
17     }
18 
19     ifc.ifc_len = sizeof( ifr );
20     ifc.ifc_buf = ( caddr_t ) ifr;
21     rc = ioctl ( sock, SIOCGIFCONF, &ifc );
22     if ( rc == -1 )
23     {
24         close( sock );
25         return -1;
26     }
27 
28     ifnum = ifc.ifc_len / sizeof ( struct ifreq );
29     fprintf( stdout, "ifnum=[%d]
======================================
", ifnum );
30     for ( i = 0; i < ifnum; i ++ )
31     {
32         fprintf( stdout, "ifname [%s]
", ifr[i].ifr_name );
33 
34         //status
35         rc = ioctl( sock, SIOCGIFFLAGS, ifr + i );
36         if ( rc != -1 )
37         {
38             if ( ifr[i].ifr_flags & IFF_PROMISC )
39             {
40                 fprintf( stdout, "PROMISC=TRUE
" );
41             }
42             else
43             {
44                 fprintf( stdout, "PROMISC=FALSE
" );
45             }
46 
47 
48             if ( ifr[i].ifr_flags & IFF_UP )
49             {
50                 fprintf( stdout, "UP=TRUE
" );
51             }
52             else
53             {
54                 fprintf( stdout, "UP=FALSE
" );
55             }
56         }
57 
58         //ip
59         rc = ioctl ( sock, SIOCGIFADDR, ifr + i );
60         if ( rc != -1 )
61         {
62             fprintf( stdout, "IP=%s
", inet_ntoa( ( ( struct sockaddr_in* )( &ifr[i].ifr_addr ) )->sin_addr ) );
63         }
64 
65         //netmask
66         rc = ioctl ( sock, SIOCGIFNETMASK, ifr + i );
67         if ( rc != -1 )
68         {
69             fprintf( stdout, "NETMASK=%s
", inet_ntoa( ( ( struct sockaddr_in* )( &ifr[i].ifr_netmask  ) )->sin_addr ) );
70         }
71 
72         //broadcast
73         rc = ioctl ( sock, SIOCGIFBRDADDR, ifr + i );
74         if ( rc != -1 )
75         {
76             fprintf( stdout, "BROADCAST=%s
", inet_ntoa( ( ( struct sockaddr_in* )( &ifr[i].ifr_broadaddr ) )->sin_addr ) );
77         }
78 
79         //mac
80         rc = ioctl ( sock, SIOCGIFHWADDR, ifr + i );
81         if ( rc != -1 )
82         {
83             fprintf( stdout, "%02x:%02x:%02x:%02x:%02x:%02x
",
84                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[0],
85                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[1],
86                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[2],
87                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[3],
88                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[4],
89                      ( unsigned char )ifr[i].ifr_hwaddr.sa_data[5] );
90         }
91     }
92 
93     close( sock );
94     return 0;
95 }