#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <errno.h>

int main(int argc, char **argv) {
	const char *packet_file = argv[1];
	FILE *packet_stream = fopen(packet_file, "rb");
	unsigned char packet[60];
	int sock;
	int r;
	struct sockaddr_in target;
	struct iphdr *ip;

	fread(packet, 1, 60, packet_stream);
	ip = (struct iphdr *)packet;

	if(ip->id != 0) {
		puts("IP ID is non-zero.");
		return -1;
	}

	sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
	target.sin_family = AF_INET;
	target.sin_addr.s_addr = ip->daddr;
	r = sendto(sock, packet, 60, 0, (struct sockaddr *)&target, sizeof(struct sockaddr_in));
	if(r == -1)
		if(errno == EPERM)
			puts("Errno EPERM found!");
		else
			puts("Other errno found!");
	else
		printf("No errno found! r = %d\n", r);
	
	return 0;
}