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pktdump_ex サンプル
[プログラムでWinPcapを利用する方法]


/*
 * Copyright (c) 1999 - 2002
 *  Politecnico di Torino.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the Politecnico
 * di Torino, and its contributors.'' Neither the name of
 * the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#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("\t Usage: pktdump_ex [-n adapter] | [-f file_name]\n\n");

if(argc < 3){

/* The user didn't provide a packet source: Retrieve the device list */ if (pcap_findalldevs(&alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
exit(1);
}

/* Print the list */ for(d=alldevs; d; d=d->next)
{
printf("%d. %s", ++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_live(d->name, 100, 1, 20, errbuf) ) == NULL)
{
fprintf(stderr,"\nError opening adapter\n");
return -1;
}
}
else{

/* The user provided a packet source: open it */ switch (argv[1] [1])
{

case 'n':
{
/* Open a physical device */ if ( (fp= pcap_open_live(argv[2], 100, 1, 20, errbuf) ) == NULL)
{
fprintf(stderr,"\nError opening adapter\n");
return -1;
}
};
break;

case 'f':
{
/* Open a capture file */ if ( (fp = pcap_open_offline(argv[2], errbuf) ) == NULL)
{
fprintf(stderr,"\nError opening dump file\n");
return -1;
}
};
break;
}
}

/* 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;
}

documentation. Copyright (c)2002-2003 Politecnico di Torino.
2005 translated by Telebusiness,Inc.
 All rights reserved.