main.h

#include <cstdio>
#include <pcap.h>
#include "getHostInfo.h"
#include "ethhdr.h"
#include "arphdr.h"
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <thread>

#pragma pack(push, 1)
struct EthArpPacket final
{
	EthArpPacket(uint8_t mode, Mac ether_dmac, Mac ether_smac, uint16_t _type, uint16_t _hrd, uint16_t _pro, uint8_t _hln, uint8_t _pln, Mac arp_smac, Ip arp_sip, Mac arp_tmac, Ip arp_tip)
	{
		eth_.dmac_ = ether_dmac;
		eth_.smac_ = ether_smac;
		eth_.type_ = htons(EthHdr::Arp);

		arp_.hrd_ = htons(ArpHdr::ETHER);
		arp_.pro_ = htons(EthHdr::Ip4);

		arp_.op_ = htons(mode);

		arp_.hln_ = Mac::SIZE;
		arp_.pln_ = Ip::SIZE;

		arp_.smac_ = arp_smac;
		arp_.sip_ = htonl(arp_sip);
		arp_.tmac_ = arp_tmac;
		arp_.tip_ = htonl(arp_tip);
	}
	
	EthHdr eth_;
	ArpHdr arp_;
};
#pragma pack(pop)

void usage()
{
	printf("syntax : send-arp <interface> <sender ip> <target ip> [<sender ip 2> <target ip 2> ...]\n");
	printf("sample : send-arp wlan0 192.168.10.2 192.168.10.1\n");
}