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FILE* soubor;

/*
 * dissect/print packet
 */
void
got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet)
{
	cout << "Zachycen packet o velikosti:" << fwrite(packet, 1, header->len, soubor) << endl;
	return;
}

int main(int argc, char **argv)
{
    
	argc = 2;
	argv[1] = "ath0";
	
	
	soubor = fopen("muj.cap", "w");
	char *dev = NULL;			/* capture device name */
	char errbuf[PCAP_ERRBUF_SIZE];		/* error buffer */
	pcap_t *handle;				/* packet capture handle */

	bpf_u_int32 mask;			/* subnet mask */
	bpf_u_int32 net;			/* ip */
	int num_packets = 1;			/* number of packets to capture */
		
	switch ( argc ) {

  	case 1 : 
    	cout << "Musis zvolit agrumenty." << endl;
		exit(EXIT_FAILURE);
  		break;

  	case 2 : 
    	if(argc == 2)
	  	dev = argv[1];
		break;
		
	default : 
    	cout << "Spatne zadane argumenty." << endl;
		exit(EXIT_FAILURE);
  		break;
	}
	
	/* get network number and mask associated with capture device */
	if (pcap_lookupnet(dev, &net, &mask, errbuf) == -1) {
		cout << "ERROR: Nemuzu ziskat masku pro. " << dev << endl;
		cout << "ERROR: " << errbuf << endl;
		net = 0; 
		mask = 0;
	}

	/* Tisk infomace o zachytavani */
	cout << "Adapter: " << dev << endl;
	cout << "Pocet packetu: " << num_packets << endl;
	
	/* Otevri zachytavani na adapteru */
	handle = pcap_open_live(dev, SNAP_LEN, 1, 1000, errbuf);
	if (handle == NULL) {
		cout << "ERROR: Nemuzu otevrit adapter " << dev << endl;
		cout << "ERROR: " << errbuf << endl;
		exit(EXIT_FAILURE);
	}

	/* Volani funkce po zachyceni jednoho packetu */
	pcap_loop(handle, num_packets, got_packet, NULL);

	/* Cisteni */
	pcap_close(handle);

	cout << endl << "Zachytavani kompletni." << endl;
	fclose(soubor);
	
return 0;
}