icmp.c

/*
 *A header with all includes.
 */
#include "program.h"

int main()
{
	struct sockaddr_in socketaddress_in;
	struct icmphdr     *icmp_header;

	char response[2048];
	int length = 2048;

	int socket_descriptor = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
	printf("[ICMP] socket descriptor is %i\n", socket_descriptor);

	/*
         * Filling socketaddress_in (sockaddr_in) structure with information.
         */
	socketaddress_in.sin_family = AF_INET;
	socketaddress_in.sin_addr.s_addr = inet_addr("192.168.42.1");
	socketaddress_in.sin_port = 0;

	/*
         * Filling icmp_header (icmphdr) structure with information.
         */
	icmp_header = (struct icmphdr *)response;
	
	icmp_header->type = ICMP_ECHO;
	icmp_header->code = 0;
	icmp_header->un.echo.id = getpid();
	icmp_header->checksum = 0;



	int status_code = sendto(socket_descriptor, response, length, 0, (struct sockaddr *)&socketaddress_in, sizeof(struct sockaddr_in));
	printf("[ICMP] sendto() has send %i bytes succesfull.\n", status_code);	

	return EXIT_SUCCESS;
}