535 lines
12 KiB
C
535 lines
12 KiB
C
/* $NetBSD: tcpdump.c,v 1.3 2001/09/19 03:37:58 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
|
|
* The Regents of the University of California. 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 University of California,
|
|
* Lawrence Berkeley Laboratory 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 <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
static const char rcsid[] =
|
|
"@(#) Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.165 2001/06/24 20:38:52 itojun Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: tcpdump.c,v 1.3 2001/09/19 03:37:58 itojun Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* tcpdump - monitor tcp/ip traffic on an ethernet.
|
|
*
|
|
* First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
|
|
* Mercilessly hacked and occasionally improved since then via the
|
|
* combined efforts of Van, Steve McCanne and Craig Leres of LBL.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <pcap.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <ctype.h>
|
|
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "machdep.h"
|
|
#include "setsignal.h"
|
|
#include "gmt2local.h"
|
|
|
|
int aflag; /* translate network and broadcast addresses */
|
|
int dflag; /* print filter code */
|
|
int eflag; /* print ethernet header */
|
|
int fflag; /* don't translate "foreign" IP address */
|
|
int nflag; /* leave addresses as numbers */
|
|
int Nflag; /* remove domains from printed host names */
|
|
int Oflag = 1; /* run filter code optimizer */
|
|
int pflag; /* don't go promiscuous */
|
|
int qflag; /* quick (shorter) output */
|
|
int Rflag = 1; /* print sequence # field in AH/ESP*/
|
|
int sflag = 0; /* use the libsmi to translate OIDs */
|
|
int Sflag; /* print raw TCP sequence numbers */
|
|
int tflag = 1; /* print packet arrival time */
|
|
int uflag = 0; /* Print undecoded NFS handles */
|
|
int vflag; /* verbose */
|
|
int xflag; /* print packet in hex */
|
|
int Xflag; /* print packet in ascii as well as hex */
|
|
|
|
char *espsecret = NULL; /* ESP secret key */
|
|
|
|
int packettype;
|
|
|
|
|
|
char *program_name;
|
|
|
|
int32_t thiszone; /* seconds offset from gmt to local time */
|
|
|
|
/* Forwards */
|
|
static RETSIGTYPE cleanup(int);
|
|
static void usage(void) __attribute__((noreturn));
|
|
|
|
/* Length of saved portion of packet. */
|
|
int snaplen = DEFAULT_SNAPLEN;
|
|
|
|
struct printer {
|
|
pcap_handler f;
|
|
int type;
|
|
};
|
|
|
|
static struct printer printers[] = {
|
|
{ arcnet_if_print, DLT_ARCNET },
|
|
{ ether_if_print, DLT_EN10MB },
|
|
{ token_if_print, DLT_IEEE802 },
|
|
#ifdef DLT_LANE8023
|
|
{ lane_if_print, DLT_LANE8023 },
|
|
#endif
|
|
#ifdef DLT_CIP
|
|
{ cip_if_print, DLT_CIP },
|
|
#endif
|
|
#ifdef DLT_ATM_CLIP
|
|
{ cip_if_print, DLT_ATM_CLIP },
|
|
#endif
|
|
{ sl_if_print, DLT_SLIP },
|
|
{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
|
|
{ ppp_if_print, DLT_PPP },
|
|
{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
|
|
{ fddi_if_print, DLT_FDDI },
|
|
{ null_if_print, DLT_NULL },
|
|
#ifdef DLT_LOOP
|
|
{ null_if_print, DLT_LOOP },
|
|
#endif
|
|
{ raw_if_print, DLT_RAW },
|
|
{ atm_if_print, DLT_ATM_RFC1483 },
|
|
#ifdef DLT_C_HDLC
|
|
{ chdlc_if_print, DLT_C_HDLC },
|
|
#endif
|
|
#ifdef DLT_HDLC
|
|
{ chdlc_if_print, DLT_HDLC },
|
|
#endif
|
|
#ifdef DLT_PPP_SERIAL
|
|
{ ppp_hdlc_if_print, DLT_PPP_SERIAL },
|
|
#endif
|
|
#ifdef DLT_PPP_ETHER
|
|
{ pppoe_if_print, DLT_PPP_ETHER },
|
|
#endif
|
|
#ifdef DLT_LINUX_SLL
|
|
{ sll_if_print, DLT_LINUX_SLL },
|
|
#endif
|
|
#ifdef DLT_IEEE802_11
|
|
{ ieee802_11_if_print, DLT_IEEE802_11},
|
|
#endif
|
|
#ifdef DLT_LTALK
|
|
{ ltalk_if_print, DLT_LTALK },
|
|
#endif
|
|
{ NULL, 0 },
|
|
};
|
|
|
|
static pcap_handler
|
|
lookup_printer(int type)
|
|
{
|
|
struct printer *p;
|
|
|
|
for (p = printers; p->f; ++p)
|
|
if (type == p->type)
|
|
return p->f;
|
|
|
|
error("unknown data link type %d", type);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static pcap_t *pd;
|
|
|
|
extern int optind;
|
|
extern int opterr;
|
|
extern char *optarg;
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
register int cnt, op, i;
|
|
bpf_u_int32 localnet, netmask;
|
|
register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
|
|
pcap_handler printer;
|
|
struct bpf_program fcode;
|
|
RETSIGTYPE (*oldhandler)(int);
|
|
u_char *pcap_userdata;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
|
|
cnt = -1;
|
|
device = NULL;
|
|
infile = NULL;
|
|
RFileName = NULL;
|
|
WFileName = NULL;
|
|
if ((cp = strrchr(argv[0], '/')) != NULL)
|
|
program_name = cp + 1;
|
|
else
|
|
program_name = argv[0];
|
|
|
|
if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
|
|
error("%s", ebuf);
|
|
|
|
#ifdef LIBSMI
|
|
smiInit("tcpdump");
|
|
#endif
|
|
|
|
opterr = 0;
|
|
while (
|
|
(op = getopt(argc, argv, "ac:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
|
|
switch (op) {
|
|
|
|
case 'a':
|
|
++aflag;
|
|
break;
|
|
|
|
case 'c':
|
|
cnt = atoi(optarg);
|
|
if (cnt <= 0)
|
|
error("invalid packet count %s", optarg);
|
|
break;
|
|
|
|
case 'd':
|
|
++dflag;
|
|
break;
|
|
|
|
case 'e':
|
|
++eflag;
|
|
break;
|
|
|
|
case 'E':
|
|
#ifndef HAVE_LIBCRYPTO
|
|
warning("crypto code not compiled in");
|
|
#endif
|
|
espsecret = optarg;
|
|
break;
|
|
|
|
case 'f':
|
|
++fflag;
|
|
break;
|
|
|
|
case 'F':
|
|
infile = optarg;
|
|
break;
|
|
|
|
case 'i':
|
|
device = optarg;
|
|
break;
|
|
|
|
case 'l':
|
|
#ifdef HAVE_SETLINEBUF
|
|
setlinebuf(stdout);
|
|
#else
|
|
setvbuf(stdout, NULL, _IOLBF, 0);
|
|
#endif
|
|
break;
|
|
|
|
case 'n':
|
|
++nflag;
|
|
break;
|
|
|
|
case 'N':
|
|
++Nflag;
|
|
break;
|
|
|
|
case 'm':
|
|
#ifdef LIBSMI
|
|
if (smiLoadModule(optarg) == 0) {
|
|
error("could not load MIB module %s", optarg);
|
|
}
|
|
sflag = 1;
|
|
#else
|
|
(void)fprintf(stderr, "%s: ignoring option `-m %s' ",
|
|
program_name, optarg);
|
|
(void)fprintf(stderr, "(no libsmi support)\n");
|
|
#endif
|
|
|
|
case 'O':
|
|
Oflag = 0;
|
|
break;
|
|
|
|
case 'p':
|
|
++pflag;
|
|
break;
|
|
|
|
case 'q':
|
|
++qflag;
|
|
break;
|
|
|
|
case 'r':
|
|
RFileName = optarg;
|
|
break;
|
|
|
|
case 'R':
|
|
Rflag = 0;
|
|
break;
|
|
|
|
case 's': {
|
|
char *end;
|
|
|
|
snaplen = strtol(optarg, &end, 0);
|
|
if (optarg == end || *end != '\0'
|
|
|| snaplen < 0 || snaplen > 65535)
|
|
error("invalid snaplen %s", optarg);
|
|
else if (snaplen == 0)
|
|
snaplen = 65535;
|
|
break;
|
|
}
|
|
|
|
case 'S':
|
|
++Sflag;
|
|
break;
|
|
|
|
case 't':
|
|
--tflag;
|
|
break;
|
|
|
|
case 'T':
|
|
if (strcasecmp(optarg, "vat") == 0)
|
|
packettype = PT_VAT;
|
|
else if (strcasecmp(optarg, "wb") == 0)
|
|
packettype = PT_WB;
|
|
else if (strcasecmp(optarg, "rpc") == 0)
|
|
packettype = PT_RPC;
|
|
else if (strcasecmp(optarg, "rtp") == 0)
|
|
packettype = PT_RTP;
|
|
else if (strcasecmp(optarg, "rtcp") == 0)
|
|
packettype = PT_RTCP;
|
|
else if (strcasecmp(optarg, "snmp") == 0)
|
|
packettype = PT_SNMP;
|
|
else if (strcasecmp(optarg, "cnfp") == 0)
|
|
packettype = PT_CNFP;
|
|
else
|
|
error("unknown packet type `%s'", optarg);
|
|
break;
|
|
|
|
case 'u':
|
|
++uflag;
|
|
break;
|
|
|
|
case 'v':
|
|
++vflag;
|
|
break;
|
|
|
|
case 'w':
|
|
WFileName = optarg;
|
|
break;
|
|
|
|
case 'x':
|
|
++xflag;
|
|
break;
|
|
|
|
case 'X':
|
|
++xflag;
|
|
++Xflag;
|
|
break;
|
|
|
|
#ifdef YYDEBUG
|
|
case 'Y':
|
|
{
|
|
/* Undocumented flag */
|
|
extern int yydebug;
|
|
yydebug = 1;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
if (aflag && nflag)
|
|
error("-a and -n options are incompatible");
|
|
|
|
if (tflag > 0)
|
|
thiszone = gmt2local(0);
|
|
|
|
if (RFileName != NULL) {
|
|
/*
|
|
* We don't need network access, so set it back to the user id.
|
|
* Also, this prevents the user from reading anyone's
|
|
* trace file.
|
|
*/
|
|
setuid(getuid());
|
|
|
|
pd = pcap_open_offline(RFileName, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
localnet = 0;
|
|
netmask = 0;
|
|
if (fflag != 0)
|
|
error("-f and -r options are incompatible");
|
|
} else {
|
|
if (device == NULL) {
|
|
device = pcap_lookupdev(ebuf);
|
|
if (device == NULL)
|
|
error("%s", ebuf);
|
|
}
|
|
*ebuf = '\0';
|
|
pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
else if (*ebuf)
|
|
warning("%s", ebuf);
|
|
i = pcap_snapshot(pd);
|
|
if (snaplen < i) {
|
|
warning("snaplen raised from %d to %d", snaplen, i);
|
|
snaplen = i;
|
|
}
|
|
if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
|
|
localnet = 0;
|
|
netmask = 0;
|
|
warning("%s", ebuf);
|
|
}
|
|
/*
|
|
* Let user own process after socket has been opened.
|
|
*/
|
|
setuid(getuid());
|
|
}
|
|
if (infile)
|
|
cmdbuf = read_infile(infile);
|
|
else
|
|
cmdbuf = copy_argv(&argv[optind]);
|
|
|
|
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
if (dflag) {
|
|
bpf_dump(&fcode, dflag);
|
|
exit(0);
|
|
}
|
|
init_addrtoname(localnet, netmask);
|
|
|
|
(void)setsignal(SIGTERM, cleanup);
|
|
(void)setsignal(SIGINT, cleanup);
|
|
/* Cooperate with nohup(1) */
|
|
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
|
|
(void)setsignal(SIGHUP, oldhandler);
|
|
|
|
if (pcap_setfilter(pd, &fcode) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
if (WFileName) {
|
|
pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
|
|
if (p == NULL)
|
|
error("%s", pcap_geterr(pd));
|
|
printer = pcap_dump;
|
|
pcap_userdata = (u_char *)p;
|
|
} else {
|
|
printer = lookup_printer(pcap_datalink(pd));
|
|
pcap_userdata = 0;
|
|
}
|
|
if (RFileName == NULL) {
|
|
(void)fprintf(stderr, "%s: listening on %s\n",
|
|
program_name, device);
|
|
(void)fflush(stderr);
|
|
}
|
|
if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
|
|
(void)fprintf(stderr, "%s: pcap_loop: %s\n",
|
|
program_name, pcap_geterr(pd));
|
|
exit(1);
|
|
}
|
|
pcap_close(pd);
|
|
exit(0);
|
|
}
|
|
|
|
/* make a clean exit on interrupts */
|
|
static RETSIGTYPE
|
|
cleanup(int signo)
|
|
{
|
|
struct pcap_stat stat;
|
|
|
|
/* Can't print the summary if reading from a savefile */
|
|
if (pd != NULL && pcap_file(pd) == NULL) {
|
|
(void)fflush(stdout);
|
|
putc('\n', stderr);
|
|
if (pcap_stats(pd, &stat) < 0)
|
|
(void)fprintf(stderr, "pcap_stats: %s\n",
|
|
pcap_geterr(pd));
|
|
else {
|
|
(void)fprintf(stderr, "%d packets received by filter\n",
|
|
stat.ps_recv);
|
|
(void)fprintf(stderr, "%d packets dropped by kernel\n",
|
|
stat.ps_drop);
|
|
}
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* Like default_print() but data need not be aligned */
|
|
void
|
|
default_print_unaligned(register const u_char *cp, register u_int length)
|
|
{
|
|
register u_int i, s;
|
|
register int nshorts;
|
|
|
|
if (Xflag) {
|
|
ascii_print(cp, length);
|
|
return;
|
|
}
|
|
nshorts = (u_int) length / sizeof(u_short);
|
|
i = 0;
|
|
while (--nshorts >= 0) {
|
|
if ((i++ % 8) == 0)
|
|
(void)printf("\n\t\t\t");
|
|
s = *cp++;
|
|
(void)printf(" %02x%02x", s, *cp++);
|
|
}
|
|
if (length & 1) {
|
|
if ((i % 8) == 0)
|
|
(void)printf("\n\t\t\t");
|
|
(void)printf(" %02x", *cp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* By default, print the packet out in hex.
|
|
*/
|
|
void
|
|
default_print(register const u_char *bp, register u_int length)
|
|
{
|
|
default_print_unaligned(bp, length);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
extern char version[];
|
|
extern char pcap_version[];
|
|
|
|
(void)fprintf(stderr, "%s version %s\n", program_name, version);
|
|
(void)fprintf(stderr, "libpcap version %s\n", pcap_version);
|
|
(void)fprintf(stderr,
|
|
"Usage: %s [-adeflnNOpqStuvxX] [-c count] [ -F file ]\n", program_name);
|
|
(void)fprintf(stderr,
|
|
"\t\t[ -i interface ] [ -r file ] [ -s snaplen ]\n");
|
|
(void)fprintf(stderr,
|
|
"\t\t[ -T type ] [ -w file ] [ expression ]\n");
|
|
exit(1);
|
|
}
|