linux如何得到本机地址,Linux下如何得到本机所有IP地址及MAC地址
已知：
gethost and gethostbyname,测试只能得到一个IP地址。
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原文：http://www.chinaunix.net/jh/23/161236.html
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整理后的代码(在fc6下经过本人编译测试通过)：
/*
cc getmac.c -o getmac
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include //for close()
#define MAXINTERFACES 16
int main(int argc, char** argv)
{
int fd, intrface, retn = 0;
struct ifreq buf[MAXINTERFACES];
struct arpreq arp;
struct ifconf ifc;
/*
if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
*/
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);
printf("interface num is intrface=%d\n\n\n", intrface);
while (intrface-- > 0)
{
printf("====================interface:%d====================\n",intrface);
printf("net device %s\n", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl(fd, SIOCGIFFLAGS, (char *) &buf[intrface])))
{
if (buf[intrface].ifr_flags & IFF_PROMISC)
{
puts("the interface is PROMISC");
retn++;
}
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP)
{
puts("the interface status is UP");
}
else
{
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl(fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts("IP address is:");
puts(inet_ntoa(((struct sockaddr_in *)
(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s",
buf[intrface].ifr_name);
perror(str);
}
/*Get HW ADDRESS of the net card */
if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts("HW address is:");
printf("%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]);
puts("");
puts("");
}
else
{
char str[256];
sprintf(str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror(str);
}
}
}
else
perror("cpm: ioctl");
}
else
perror("cpm: socket");
close(fd);
return retn;
}
另外一个整理好的：
/*
cc getmac.c -o getmac1
*/
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
struct in_addr myself,mymask;
int fd_arp;
struct ifreq ifr;
main(int argc,char* argv[]) {
char device[32];
struct sockaddr from,to;
int fromlen;
struct sockaddr_in *sin_ptr;
u_char *ptr;
int n;
strcpy(device,"lo");
if((fd_arp=socket(AF_INET,SOCK_PACKET,htons(0x0806)))<0) {
perror("arp socket error");
exit(-1);
}
strcpy(ifr.ifr_name,device);
if(ioctl(fd_arp,SIOCGIFADDR,&ifr)<0) {
perror("ioctl SIOCGIFADDR error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
myself=sin_ptr->sin_addr;
// get network mask
if(ioctl(fd_arp,SIOCGIFNETMASK,&ifr)<0) {
perror("ioctl SIOCGIFNETMASK error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
mymask=sin_ptr->sin_addr;
//if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
// get mac address
if(ioctl(fd_arp,SIOCGIFHWADDR,&ifr)<0) {
perror("ioctl SIOCGIFHWADDR error");
exit(-1);
}
ptr=(u_char *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0];
printf("\nrequest mac %02x:%02x:%02x:%02x:%02x:%02x,",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
printf("\nrequest netmask %s",inet_ntoa(mymask));
printf("\nrequest IP %s\n",inet_ntoa(myself));
}
总结
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