Generic Packet Injection. Original Source: http://code.securitytube.net/Generic-Packet-Injection-Program.c

Generic-Packet-Injection-Program.c

#include<stdio.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<features.h>
#include<linux/if_packet.h>
#include<linux/if_ether.h>
#include<errno.h>
#include<sys/ioctl.h>
#include<net/if.h>

#define PACKET_LENGTH  1024


int CreateRawSocket(int protocol_to_sniff)
{
	int rawsock;

	if((rawsock = socket(PF_PACKET, SOCK_RAW, htons(protocol_to_sniff)))== -1)
	{
		perror("Error creating raw socket: ");
		exit(-1);
	}

	return rawsock;
}

int BindRawSocketToInterface(char *device, int rawsock, int protocol)
{
	
	struct sockaddr_ll sll;
	struct ifreq ifr;

	bzero(&sll, sizeof(sll));
	bzero(&ifr, sizeof(ifr));
	
	/* First Get the Interface Index  */


	strncpy((char *)ifr.ifr_name, device, IFNAMSIZ);
	if((ioctl(rawsock, SIOCGIFINDEX, &ifr)) == -1)
	{
		printf("Error getting Interface index !\n");
		exit(-1);
	}

	/* Bind our raw socket to this interface */

	sll.sll_family = AF_PACKET;
	sll.sll_ifindex = ifr.ifr_ifindex;
	sll.sll_protocol = htons(protocol); 


	if((bind(rawsock, (struct sockaddr *)&sll, sizeof(sll)))== -1)
	{
		perror("Error binding raw socket to interface\n");
		exit(-1);
	}

	return 1;
	
}


int SendRawPacket(int rawsock, unsigned char *pkt, int pkt_len)
{
	int sent= 0;

	/* A simple write on the socket ..thats all it takes ! */

	if((sent = write(rawsock, pkt, pkt_len)) != pkt_len)
	{
		return 0;
	}

	return 1;
	

}


/* argv[1] is the device e.g. eth0
   argv[2] is the number of packets to send
*/
 
main(int argc, char **argv)
{

	int raw;
	unsigned char packet[PACKET_LENGTH];
	int num_of_pkts;
	
	/* Set the packet to all A's */
	
	memset(packet, 'A', PACKET_LENGTH);

	/* Create the raw socket */

	raw = CreateRawSocket(ETH_P_ALL);

	/* Bind raw socket to interface */

	BindRawSocketToInterface(argv[1], raw, ETH_P_ALL);

	num_of_pkts = atoi(argv[2]);

	while((num_of_pkts--)>0)
	{

		if(!SendRawPacket(raw, packet, PACKET_LENGTH))
		{
			perror("Error sending packet");
		}
		else
		{
			printf("Packet sent successfully\n");
		}
	}

	close(raw);

	return 0;
}

Author: Vivek Ramachandran

Email: vivek [@] securitytube.net

On a side note: your code, slightly reformatted, has been used in Roland Emmerichs feature film "White House Down" to represent the work of the hacker breaking into White House and NORAD defense systems. Screenshots: