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dsniff.c
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dsniff.c
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/*
dsniff.c
Password sniffer, because DrHoney wanted one.
This is intended for demonstration purposes and educational use only.
Copyright (c) 2000 Dug Song <dugsong@monkey.org>
$Id: dsniff.c,v 1.68 2000/11/19 21:39:13 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <err.h>
#include <libnet.h>
#include <nids.h>
#include <pcap.h>
#include "options.h"
#include "pathnames.h"
#include "pcaputil.h"
#include "trigger.h"
#include "record.h"
#include "version.h"
#define MAX_LINES 6
#define MIN_SNAPLEN 1024
int Opt_client = 0;
int Opt_debug = 0;
u_short Opt_dns = 1;
int Opt_magic = 0;
int Opt_read = 0;
int Opt_write = 0;
int Opt_snaplen = MIN_SNAPLEN;
int Opt_lines = MAX_LINES;
void
usage(void)
{
fprintf(stderr, "Version: " VERSION "\n"
"Usage: dsniff [-cdmn] [-i interface] [-s snaplen] [-f services]\n"
" [-t trigger[,...]] [-r|-w savefile] [expression]\n");
exit(1);
}
void
sig_hup(int sig)
{
trigger_dump();
}
void
sig_die(int sig)
{
record_close();
exit(0);
}
void
null_syslog(int type, int errnum, struct ip *iph, void *data)
{
}
int
main(int argc, char *argv[])
{
int c;
char *services, *savefile, *triggers;
services = savefile = triggers = NULL;
while ((c = getopt(argc, argv, "cdf:i:mnr:s:t:w:h?V")) != -1) {
switch (c) {
case 'c':
Opt_client = 1;
break;
case 'd':
Opt_debug++;
break;
case 'f':
services = optarg;
break;
case 'i':
nids_params.device = optarg;
break;
case 'm':
Opt_magic = 1;
break;
case 'n':
Opt_dns = 0;
break;
case 'r':
Opt_read = 1;
savefile = optarg;
break;
case 's':
if ((Opt_snaplen = atoi(optarg)) == 0)
usage();
break;
case 't':
triggers = optarg;
break;
case 'w':
Opt_write = 1;
savefile = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (Opt_read && Opt_write)
usage();
if (!record_init(savefile))
err(1, "record_init");
signal(SIGHUP, sig_hup);
signal(SIGINT, sig_die);
signal(SIGTERM, sig_die);
if (Opt_read) {
record_dump();
record_close();
exit(0);
}
if (argc != 0)
nids_params.pcap_filter = copy_argv(argv);
nids_params.scan_num_hosts = 0;
nids_params.syslog = null_syslog;
if (!nids_init()) {
record_close();
errx(1, "nids_init: %s", nids_errbuf);
}
if (Opt_magic) {
trigger_init_magic(DSNIFF_LIBDIR DSNIFF_MAGIC);
}
if (triggers) {
trigger_init_list(triggers);
}
if (services == NULL) {
services = DSNIFF_LIBDIR DSNIFF_SERVICES;
}
trigger_init_services(services);
nids_register_ip(trigger_ip);
nids_register_ip(trigger_udp);
if (Opt_client) {
nids_register_ip(trigger_tcp_raw);
signal(SIGALRM, trigger_tcp_raw_timeout);
alarm(TRIGGER_TCP_RAW_TIMEOUT);
}
else nids_register_tcp(trigger_tcp);
if (nids_params.pcap_filter != NULL) {
warnx("listening on %s [%s]", nids_params.device,
nids_params.pcap_filter);
}
else warnx("listening on %s", nids_params.device);
nids_run();
/* NOTREACHED */
exit(0);
}