#define _GNU_SOURCE

#include <sys/types.h>
#include <string.h>
#include <ifaddrs.h>
#include <sys/socket.h>
#include <linux/if_packet.h>
#include <net/ethernet.h> /* the L2 protocols */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <dlfcn.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>

struct sockaddr_ll addr_pkt = {
    .sll_family = AF_PACKET,
    .sll_halen = 6,
    .sll_addr = {0x00, 0x42, 0x42, 0x42, 0x42, 0x42},
};

struct ifaddrs ifa1 = {
    .ifa_next = 0,
    .ifa_name = "eth0",
    .ifa_flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING,
    .ifa_addr = (struct sockaddr *)&addr_pkt
};

struct sockaddr_in addr0 = {
    .sin_family = AF_INET,
    .sin_addr.s_addr = 0x0100000a,
};

struct sockaddr_in mask0 = {
    .sin_family = AF_INET,
    .sin_addr.s_addr = 0x00ffffff,
};

struct sockaddr_in bcast0 = {
    .sin_family = AF_INET,
    .sin_addr.s_addr = 0xff00000a,
};

struct ifaddrs ifa0 = {
    .ifa_next = &ifa1,
    .ifa_name = "eth0",
    .ifa_flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING,
    .ifa_addr = (struct sockaddr *)&addr0,
    .ifa_netmask = (struct sockaddr *)&mask0,
    .ifa_ifu.ifu_broadaddr = (struct sockaddr *)&bcast0
};

int getifaddrs(struct ifaddrs **ifap)
{
    *ifap = &ifa0;
}

void freeifaddrs(struct ifaddrs *ifa)
{
    (void*)ifa;
}

#define SIOCGIFHWADDR 0x8927

int ioctl(int d, unsigned long int request, ...)
{
    va_list ap;
    va_start(ap, request);
    void *argp = va_arg(ap, void*);
    va_end(ap);

    static void *handle = 0;
    static int (*orig_ioctl)(int, int, void*);
    int ret;
    char *p;

    if (!orig_ioctl) {
        orig_ioctl = dlsym(RTLD_NEXT, "ioctl");
    }

    if (request == SIOCGIFHWADDR) {
        struct ifreq *ifr = argp;
        if (!strcmp(ifr->ifr_name, "eth0")) {
            ifr->ifr_hwaddr.sa_family = ARPHRD_ETHER;
            memcpy(ifr->ifr_hwaddr.sa_data, addr_pkt.sll_addr, 6);
            return 0;
        }
        errno = ENOENT;
        return -1;
    }

    return orig_ioctl(d, request, argp);
}