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#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>
#include <string>
#include <iostream>
#include <cstring>
using namespace std;
void peek_interfaces(int fd);
void print_hw_addr(int fd, const char* if_name);
int main() {
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if(-1 == fd) {
perror("Failed create socket.");
return -1;
}
peek_interfaces(fd);
close(fd);
return 0;
}
void peek_interfaces(int fd) {
ifreq ifs[16] = {0};
ifconf conf = {sizeof(ifs)};
conf.ifc_req = ifs;
if(-1 == ioctl(fd, SIOCGIFCONF, &conf)) {
perror("Failed IOCTL SIOCGIFCONF.");
return;
}
if(conf.ifc_len >= sizeof(ifs)) {
perror("Buffer too small for IOCTL SIOCGIFCONF.");
return;
}

int num = conf.ifc_len / sizeof(ifreq);
cout << num << " interface entry retrieved." << endl;
for(int i = 0; i < num; ++i) {
cout << "[ " << ifs[i].ifr_name << " ]" << endl;
sockaddr_in* sai = (sockaddr_in*)&ifs[i].ifr_addr;
cout << "Addr: " << inet_ntoa(sai->sin_addr) << endl;
print_hw_addr(fd, ifs[i].ifr_name);
cout << endl;
}
}
void print_hw_addr(int fd, const char* if_name) {
ifreq req = {0};
strcpy(req.ifr_name, if_name);
if(-1 == ioctl(fd, SIOCGIFFLAGS, &req)) {
perror("Failed IOCTL SIOCGIFFLAGS.");
return;
}
if(req.ifr_flags & IFF_LOOPBACK) {
cout << "Is LOOPBACK." << endl;
return;
}
if(-1 == ioctl(fd, SIOCGIFHWADDR, &req)) {
perror("Failed IOCTL SIOCGIFHWADDR.");
return;
}
unsigned char* puc = (unsigned char*)req.ifr_hwaddr.sa_data;
printf("HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
puc[0], puc[1], puc[2], puc[3], puc[4], puc[5]);
}