#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/* got this from internet somewhere.. very crude sniffer
   need to do ifconfig <iface> promisc.
   this sends out 4096 padded buffers for pf to catch through a pipe */


#define BUFLEN 4096
int main()
{
    int sock, bytes_recieved;
    socklen_t fromlen;
    char buffer[BUFLEN];
    struct sockaddr_in from;

    sock = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);
    if (-1 == sock){
	perror("can't open socket");
	return 1;
    }
    
    while(1)
	{
	    fromlen = sizeof from;
	    memset(buffer, 0, BUFLEN);
	    bytes_recieved = recvfrom(sock, buffer, BUFLEN, 0,
				      (struct sockaddr *)&from, &fromlen);

	    fprintf(stderr, "%04d bytes from %s\n", bytes_recieved, inet_ntoa(from.sin_addr));

	    // dump to stdout
	    int i;
	    for (i=0; i<BUFLEN; i+=64){
		memcpy(buffer + i, buffer, 64);
	    }
	    write(1, buffer, BUFLEN);

	}
}