/*
 * Copyright (c) 1999 - 2003
 * NetGroup, Politecnico di Torino (Italy)
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright 
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Politecnico di Torino nor the names of its 
 * contributors may be used to endorse or promote products derived from 
 * this software without specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */


#include <stdlib.h>
#include <stdio.h>

#include <pcap.h>

#define LINE_LEN 16


main(int argc, char **argv)
{	
pcap_if_t *alldevs, *d;
pcap_t *fp;
u_int inum, i=0;
char errbuf[PCAP_ERRBUF_SIZE];
int res;
struct pcap_pkthdr *header;
u_char *pkt_data;

	printf("pktdump_ex: prints the packets of the network using WinPcap.\n");
	printf("   Usage: pktdump_ex [-s source]\n\n"
		   "   Examples:\n"
		   "      pktdump_ex -s file://c:/temp/file.acp\n"
		   "      pktdump_ex -s rpcap://\\Device\\NPF_{C8736017-F3C3-4373-94AC-9A34B7DAD998}\n\n");

	if(argc < 3)
	{

		printf("\nNo adapter selected: printing the device list:\n");
		/* The user didn't provide a packet source: Retrieve the local device list */
		if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
		{
			fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
			exit(1);
		}
		
		/* Print the list */
		for(d=alldevs; d; d=d->next)
		{
			printf("%d. %s\n    ", ++i, d->name);

			if (d->description)
				printf(" (%s)\n", d->description);
			else
				printf(" (No description available)\n");
		}
		
		if (i==0)
		{
			printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
			return -1;
		}
		
		printf("Enter the interface number (1-%d):",i);
		scanf("%d", &inum);
		
		if (inum < 1 || inum > i)
		{
			printf("\nInterface number out of range.\n");

			/* Free the device list */
			pcap_freealldevs(alldevs);
			return -1;
		}
		
		/* Jump to the selected adapter */
		for (d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
		
		/* Open the device */
		if ( (fp= pcap_open(d->name,
							100 /*snaplen*/,
							PCAP_OPENFLAG_PROMISCUOUS /*flags*/,
							20 /*read timeout*/,
							NULL /* remote authentication */,
							errbuf)
							) == NULL)
		{
			fprintf(stderr,"\nError opening adapter\n");
			return -1;
		}
	}
	else 
	{
		// Do not check for the switch type ('-s')
		if ( (fp= pcap_open(argv[2],
							100 /*snaplen*/,
							PCAP_OPENFLAG_PROMISCUOUS /*flags*/,
							20 /*read timeout*/,
							NULL /* remote authentication */,
							errbuf)
							) == NULL)
		{
			fprintf(stderr,"\nError opening source: %s\n", errbuf);
			return -1;
		}
	}

	/* Read the packets */
	while((res = pcap_next_ex( fp, &header, &pkt_data)) >= 0)
	{

		if(res == 0)
			/* Timeout elapsed */
			continue;

		/* print pkt timestamp and pkt len */
		printf("%ld:%ld (%ld)\n", header->ts.tv_sec, header->ts.tv_usec, header->len);			
		
		/* Print the packet */
		for (i=1; (i < header->caplen + 1 ) ; i++)
		{
			printf("%.2x ", pkt_data[i-1]);
			if ( (i % LINE_LEN) == 0) printf("\n");
		}
		
		printf("\n\n");		
	}

	if(res == -1)
	{
		printf("Error reading the packets: %s\n", pcap_geterr(fp));
		return -1;
	}

	return 0;
}
