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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="54.htm">上一层</a>][<a href="87.htm">下一篇</a>]
<hr><p align="left"><small>发信人: clown (梧桐叶), 信区: UNP <br>
标 题: 得到mac地址和网卡状态的函数 <br>
发信站: UNIX编程 (2001年09月26日20:58:07 星期三), 站内信件 <br>
<br>
//get mac address and netcard status <br>
#include <stdio.h> <br>
#include <stdlib.h> <br>
#include <sys/ioctl.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <net/if.h> <br>
#include <netinet/in.h> <br>
#include <arpa/inet.h> <br>
#include <string.h> <br>
<br>
#define LINELENGTH 32 <br>
<br>
struct ifconf ifc; <br>
int GetIfconf(); <br>
int GetMac(); <br>
<br>
int main() <br>
{ <br>
{ <br>
GetMac(); <br>
return 0; <br>
} <br>
<br>
<br>
//get and save mac address <br>
int GetMac() <br>
{ <br>
struct ifreq *ifr; <br>
int sockfd, flags; <br>
void *ptr; <br>
unsigned char *hw; <br>
<br>
if(GetIfconf() == -1) <br>
//Warning: the result between kernel 2.0 and 2.2 is not the same!!! <br>
//In kernel 2.0, it doesn't display the netcard name whose status <br>
//is down. <br>
return -1; <br>
if((sockfd=socket(AF_INET, SOCK_DGRAM, 0)) == -1) <br>
return -1; <br>
for(ptr=ifc.ifc_buf; (caddr_t)ptr < ifc.ifc_buf+ifc.ifc_len; ){ <br>
ifr=(struct ifreq *)ptr; <br>
//for the next one in buffer <br>
ptr += sizeof(ifr->ifr_name)+sizeof(struct sockaddr); <br>
//get the hardware address <br>
if(ioctl(sockfd, SIOCGIFHWADDR, ifr) == -1) { <br>
free(ifc.ifc_buf); <br>
ifc.ifc_req = NULL; <br>
return -1; <br>
} <br>
hw=&ifr->ifr_hwaddr.sa_data[0]; <br>
printf("%s %x:%x:%x:%x:%x:%x", ifr->ifr_name, *hw, *(hw+1), *(hw+2), *(h <br>
w+ <br>
3), *(hw+4), *(hw+5)); <br>
if(ioctl(sockfd, SIOCGIFFLAGS, ifr) == -1) { <br>
free(ifc.ifc_buf); <br>
ifc.ifc_req = NULL; <br>
return -1; <br>
} <br>
flags=ifr->ifr_flags; <br>
if(flags & IFF_UP) { <br>
printf(" is running\n"); <br>
} else <br>
printf(" is donw\n"); <br>
} //end for of struct ifreq <br>
free(ifc.ifc_buf); <br>
ifc.ifc_req = NULL; <br>
return 0; <br>
} <br>
<br>
<br>
//get the value of struct ifconf ifc <br>
//global variable: struct ifconf ifc <br>
int GetIfconf() <br>
{ <br>
int sockfd; <br>
int len, lastlen; <br>
void *buf; <br>
<br>
if((sockfd=socket(AF_INET, SOCK_DGRAM, 0)) == -1) <br>
return -1; <br>
lastlen=0; <br>
len=10*sizeof(struct ifconf); <br>
//size of struct ifconf: 8 <br>
//size of struct ifreq: 32 <br>
for(;;){ <br>
for(;;){ <br>
buf=malloc(len); <br>
ifc.ifc_len=len; <br>
ifc.ifc_buf=buf; <br>
if(ioctl(sockfd, SIOCGIFCONF, &ifc) <0) { <br>
free(buf); <br>
return -1; <br>
} <br>
else{ <br>
if(ifc.ifc_len == lastlen) <br>
break; //success, the only point to exit for() <br>
lastlen=ifc.ifc_len; <br>
} <br>
len += 10*sizeof(struct ifconf); <br>
free(buf); <br>
} <br>
return 0; <br>
} <br>
<br>
<br>
结果： <br>
lo 0:0:0:0:0:0 is running <br>
eth0 0:10:b2:4c:68:a is running <br>
eth1 0:d0:b7:e0:8f:e1 is running <br>
<br>
<br>
-- <br>
易朽的是生命，似那转瞬即谢的花朵；然而永存的，是对未来的渴望， <br>
是那生生世世传递下来的，不朽的，生的激情。每一朵勇敢开放的花， <br>
都是一个死亡唇边的微笑。 <br>
※ 来源:·UNIX编程 www.tiaozhan.com/unixbbs/·[FROM: 202.114.1.61] <br>
</small><hr>
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