GetDevIPMac.cc

#include <sys/ioctl.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <cstdio>
#include <netinet/in.h>
#include <cerrno>
#include <arpa/inet.h>
#include <net/if_arp.h>

int main(int argc, char *argv[])
{
    struct ifreq *ifr, *ifend;
    struct ifconf ifc;
    struct ifreq ifs[16];
    int sockfd;
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
        fprintf(stderr, "[Dev error] %s \n", strerror(errno) );
    } else {
        ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
        for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
            if (ifr->ifr_addr.sa_family == AF_INET) {
                printf("[dev]%s\n", ifr->ifr_name);

                strncpy(ifr->ifr_name, "eth0", sizeof(ifr->ifr_name));

                if(ioctl(sockfd,SIOCGIFADDR,&ifr)<0)
                    fprintf(stderr, "[IP error] %s \n", strerror(errno) );
//                  perror("ioctl(SIOCGIFADDR)");
                else{
                    struct sockaddr *address = &(ifr->ifr_addr);
                    struct sockaddr_in *address_in = (struct sockaddr_in *) &address;
                    printf("[IP]%s\n", inet_ntoa(address_in->sin_addr));
                }


                if(ioctl (sockfd, SIOCGIFNETMASK, &ifr) <0)
                    fprintf(stderr, "[Netmask error] %s \n", strerror(errno) );
                else{
                    struct sockaddr *address = &(ifr->ifr_netmask);
                    struct sockaddr_in *address_in = (struct sockaddr_in *) &address;
                    printf("[NetMask]%s\n", inet_ntoa(address_in->sin_addr));
                }

                ifr->ifr_hwaddr.sa_family = ARPHRD_ETHER;
                if (ioctl (sockfd, SIOCGIFHWADDR, &ifr) < 0)
                    fprintf(stderr, "[MAC error] %s \n", strerror(errno) );
                else{
                    unsigned char *mac = (unsigned char *) ifr->ifr_hwaddr.sa_data;
                    for(int i=0; i<6; i++){
                        printf("%02X-",(int)mac[i]);
                    }
                }

                printf("\n\n");
//              emit ifDetected(QString(ifr->ifr_name),
            }
        }
    }
    close(sockfd);