獲取IP、掩碼、MAC

獲取IP、掩碼、MAC和廣播地址是比較容易的，只需要呼叫對應的IOCTL即可。只是大家對Linux下的IOCTL可能不太熟悉。卻看示例程式碼：

 const char* szDevName  =  ”eth0“   （網絡卡名稱）

0001 void DispNetInfo(const char* szDevName)

0002 {

0003     int s = socket(AF_INET, SOCK_DGRAM, 0);

0004     if (s < 0)

0005     {

0006         fprintf(stderr, "Create socket failed!errno=%d"
 
, errno);

0007         return;

0008     }

0009 

0010     struct ifreq ifr;

0011     unsigned char mac[6];

0012     unsigned long nIP, nNetmask, nBroadIP;

0013 

0014     printf("%s:\n", szDevName);

0015 

0016     strcpy(ifr.ifr_name, szDevName);

0017     if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)

0018     {

0019         return;

0020     }

0021     memcpy(mac, ifr.ifr_hwaddr.sa_data, sizeof(mac));

0022     printf("\tMAC: %02x-%02x-%02x-%02x-%02x-%02x\n",

0023             mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);

0024 

0025     strcpy(ifr.ifr_name, szDevName);

0026     if (ioctl(s, SIOCGIFADDR, &ifr) < 0)

0027     {

0028         nIP = 0;

0029     }

0030     else

0031     {

0032         nIP = *(unsigned long*)&ifr.ifr_broadaddr.sa_data[2];

0033     }

0034     printf("\tIP: %s\n", inet_ntoa(*(in_addr*)&nIP));

0035 

0036     strcpy(ifr.ifr_name, szDevName);

0037     if (ioctl(s, SIOCGIFBRDADDR, &ifr) < 0)

0038     {

0039         nBroadIP = 0;

0040     }

0041     else

0042     {

0043         nBroadIP = *(unsigned long*)&ifr.ifr_broadaddr.sa_data[2];

0044     }

0045     printf("\tBroadIP: %s\n", inet_ntoa(*(in_addr*)&nBroadIP));

0046 

0047     strcpy(ifr.ifr_name, szDevName);

0048     if (ioctl(s, SIOCGIFNETMASK, &ifr) < 0)

0049     {

0050         nNetmask = 0;

0051     }

0052     else

0053     {

0054         nNetmask = *(unsigned long*)&ifr.ifr_netmask.sa_data[2];

0055     }

0056     printf("\tNetmask: %s\n", inet_ntoa(*(in_addr*)&nNetmask));

0057     close(s);

0058 }

獲取閘道器：

1. QString GetGateWay()  
2. {  
3.     FILE *fp;  
4.     char buf[512];  
5.     char cmd[128];  
6.     char gateway[30];  
7.     char *tmp;  
8.     strcpy(cmd, "ip route");  
9.     fp = popen(cmd, "r");  
10.     if(NULL == fp)  
11.     {  
12.         perror("popen error");  
13.         return"";  
14.     }  
15.     while(fgets(buf, sizeof(buf), fp) != NULL)  
16.     {  
17.         tmp =buf;  
18.         while(*tmp && isspace(*tmp))  
19.             ++ tmp;  
20.         if(strncmp(tmp, "default", strlen("default")) == 0)  
21.             break;  
22.     }  
23.     sscanf(buf, "%*s%*s%s", gateway);         
24.     printf("default gateway:%s/n", gateway);  
25.     pclose(fp);  
26.     return QString(gateway);  
27. }