cc391cce11
print-atm.c no longer performs special handling for FORE headers; these can no doubt be re-added at a later date. print-fr.c is effectively a no-op. print-llc.c has had the default_print_unaligned() call removed as tcpdump no longer defines this function, however the prototype is still present. Suggest we roll in a diff to use print_unknown_data().
1117 lines
26 KiB
C
1117 lines
26 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Support for splitting captures into multiple files with a maximum
|
|
* file size:
|
|
*
|
|
* Copyright (c) 2001
|
|
* Seth Webster <swebster@sst.ll.mit.edu>
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|
*/
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|
|
|
#ifndef lint
|
|
static const char copyright[] _U_ =
|
|
"@(#) 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[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.216.2.10 2004/03/17 19:47:48 guy Exp $ (LBL)";
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|
#endif
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|
|
|
/* $FreeBSD$ */
|
|
|
|
/*
|
|
* 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"
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|
#endif
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|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#ifdef WIN32
|
|
#include "getopt.h"
|
|
#include "w32_fzs.h"
|
|
extern int strcasecmp (const char *__s1, const char *__s2);
|
|
extern int SIZE_BUF;
|
|
#define off_t long
|
|
#define uint UINT
|
|
#endif /* WIN32 */
|
|
|
|
#include <pcap.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
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|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "machdep.h"
|
|
#include "setsignal.h"
|
|
#include "gmt2local.h"
|
|
#include "pcap-missing.h"
|
|
|
|
int dflag; /* print filter code */
|
|
int eflag; /* print ethernet header */
|
|
int fflag; /* don't translate "foreign" IP address */
|
|
int Lflag; /* list available data link types and exit */
|
|
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; /* "unbuffered" output of dump files */
|
|
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 */
|
|
off_t Cflag = 0; /* rotate dump files after this many bytes */
|
|
int Aflag = 0; /* print packet only in ascii observing LF, CR, TAB, SPACE */
|
|
int dlt = -1; /* if != -1, ask libpcap for the DLT it names */
|
|
|
|
const char *dlt_name = NULL;
|
|
|
|
char *espsecret = NULL; /* ESP secret key */
|
|
|
|
int packettype;
|
|
|
|
static int infodelay;
|
|
static int infoprint;
|
|
|
|
char *program_name;
|
|
|
|
int32_t thiszone; /* seconds offset from gmt to local time */
|
|
|
|
/* Forwards */
|
|
static RETSIGTYPE cleanup(int);
|
|
static void usage(void) __attribute__((noreturn));
|
|
static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
|
|
|
|
static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
|
|
static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
|
|
static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
|
|
|
|
#ifdef SIGINFO
|
|
RETSIGTYPE requestinfo(int);
|
|
#endif
|
|
|
|
static void info(int);
|
|
static u_int packets_captured;
|
|
|
|
/* Length of saved portion of packet. */
|
|
int snaplen = DEFAULT_SNAPLEN;
|
|
|
|
typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
|
|
|
|
struct printer {
|
|
if_printer f;
|
|
int type;
|
|
};
|
|
|
|
static struct printer printers[] = {
|
|
{ arcnet_if_print, DLT_ARCNET },
|
|
#ifdef DLT_ARCNET_LINUX
|
|
{ arcnet_linux_if_print, DLT_ARCNET_LINUX },
|
|
#endif
|
|
{ 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 },
|
|
#ifdef DLT_SLIP_BSDOS
|
|
{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
|
|
#endif
|
|
{ ppp_if_print, DLT_PPP },
|
|
#ifdef DLT_PPP_BSDOS
|
|
{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
|
|
#endif
|
|
{ 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
|
|
#ifdef DLT_PFLOG
|
|
{ pflog_if_print, DLT_PFLOG },
|
|
#endif
|
|
#ifdef DLT_FR
|
|
{ fr_if_print, DLT_FR },
|
|
#endif
|
|
#ifdef DLT_FRELAY
|
|
{ fr_if_print, DLT_FRELAY },
|
|
#endif
|
|
#ifdef DLT_SUNATM
|
|
{ sunatm_if_print, DLT_SUNATM },
|
|
#endif
|
|
#ifdef DLT_IP_OVER_FC
|
|
{ ipfc_if_print, DLT_IP_OVER_FC },
|
|
#endif
|
|
#ifdef DLT_PRISM_HEADER
|
|
{ prism_if_print, DLT_PRISM_HEADER },
|
|
#endif
|
|
#ifdef DLT_IEEE802_11_RADIO
|
|
{ ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
|
|
#endif
|
|
#ifdef DLT_ENC
|
|
{ enc_if_print, DLT_ENC },
|
|
#endif
|
|
#ifdef DLT_APPLE_IP_OVER_IEEE1394
|
|
{ ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
|
|
#endif
|
|
{ NULL, 0 },
|
|
};
|
|
|
|
static if_printer
|
|
lookup_printer(int type)
|
|
{
|
|
struct printer *p;
|
|
|
|
for (p = printers; p->f; ++p)
|
|
if (type == p->type)
|
|
return p->f;
|
|
|
|
return NULL;
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static pcap_t *pd;
|
|
|
|
extern int optind;
|
|
extern int opterr;
|
|
extern char *optarg;
|
|
|
|
struct print_info {
|
|
if_printer printer;
|
|
};
|
|
|
|
struct dump_info {
|
|
char *WFileName;
|
|
pcap_t *pd;
|
|
pcap_dumper_t *p;
|
|
};
|
|
|
|
static void
|
|
show_dlts_and_exit(pcap_t *pd)
|
|
{
|
|
int n_dlts;
|
|
int *dlts = 0;
|
|
const char *dlt_name;
|
|
|
|
n_dlts = pcap_list_datalinks(pd, &dlts);
|
|
if (n_dlts < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
else if (n_dlts == 0 || !dlts)
|
|
error("No data link types.");
|
|
|
|
(void) fprintf(stderr, "Data link types (use option -y to set):\n");
|
|
|
|
while (--n_dlts >= 0) {
|
|
dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
|
|
if (dlt_name != NULL) {
|
|
(void) fprintf(stderr, " %s (%s)", dlt_name,
|
|
pcap_datalink_val_to_description(dlts[n_dlts]));
|
|
|
|
/*
|
|
* OK, does tcpdump handle that type?
|
|
*/
|
|
if (lookup_printer(dlts[n_dlts]) == NULL)
|
|
(void) fprintf(stderr, " (not supported)");
|
|
putchar('\n');
|
|
} else {
|
|
(void) fprintf(stderr, " DLT %d (not supported)\n",
|
|
dlts[n_dlts]);
|
|
}
|
|
}
|
|
free(dlts);
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* Set up flags that might or might not be supported depending on the
|
|
* version of libpcap we're using.
|
|
*/
|
|
#ifdef WIN32
|
|
#define B_FLAG "B:"
|
|
#define B_FLAG_USAGE " [ -B size ]"
|
|
#else /* WIN32 */
|
|
#define B_FLAG
|
|
#define B_FLAG_USAGE
|
|
#endif /* WIN32 */
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
#define D_FLAG "D"
|
|
#else
|
|
#define D_FLAG
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
#define U_FLAG "U"
|
|
#else
|
|
#define U_FLAG
|
|
#endif
|
|
|
|
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 callback;
|
|
int type;
|
|
struct bpf_program fcode;
|
|
#ifndef WIN32
|
|
RETSIGTYPE (*oldhandler)(int);
|
|
#endif
|
|
struct print_info printinfo;
|
|
struct dump_info dumpinfo;
|
|
u_char *pcap_userdata;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
pcap_if_t *devpointer;
|
|
int devnum;
|
|
#endif
|
|
int status;
|
|
#ifdef WIN32
|
|
u_int UserBufferSize = 1000000;
|
|
if(wsockinit() != 0) return 1;
|
|
#endif /* WIN32 */
|
|
|
|
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, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:nNOpqr:Rs:StT:u" U_FLAG "vw:xXy:Y")) != -1)
|
|
switch (op) {
|
|
|
|
case 'a':
|
|
/* compatibility for old -a */
|
|
break;
|
|
|
|
case 'A':
|
|
++xflag;
|
|
++Xflag;
|
|
++Aflag;
|
|
break;
|
|
|
|
#ifdef WIN32
|
|
case 'B':
|
|
UserBufferSize = atoi(optarg)*1024;
|
|
if (UserBufferSize < 0)
|
|
error("invalid packet buffer size %s", optarg);
|
|
break;
|
|
#endif /* WIN32 */
|
|
|
|
case 'c':
|
|
cnt = atoi(optarg);
|
|
if (cnt <= 0)
|
|
error("invalid packet count %s", optarg);
|
|
break;
|
|
|
|
case 'C':
|
|
Cflag = atoi(optarg) * 1000000;
|
|
if (Cflag < 0)
|
|
error("invalid file size %s", optarg);
|
|
break;
|
|
|
|
case 'd':
|
|
++dflag;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
case 'D':
|
|
if (pcap_findalldevs(&devpointer, ebuf) < 0)
|
|
error("%s", ebuf);
|
|
else {
|
|
for (i = 0; devpointer != 0; i++) {
|
|
printf("%d.%s", i+1, devpointer->name);
|
|
if (devpointer->description != NULL)
|
|
printf(" (%s)", devpointer->description);
|
|
printf("\n");
|
|
devpointer = devpointer->next;
|
|
}
|
|
}
|
|
return 0;
|
|
#endif /* HAVE_PCAP_FINDALLDEVS */
|
|
|
|
case 'L':
|
|
Lflag++;
|
|
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':
|
|
if (optarg[0] == '0' && optarg[1] == 0)
|
|
error("Invalid adapter index");
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
/*
|
|
* If the argument is a number, treat it as
|
|
* an index into the list of adapters, as
|
|
* printed by "tcpdump -D".
|
|
*
|
|
* This should be OK on UNIX systems, as interfaces
|
|
* shouldn't have names that begin with digits.
|
|
* It can be useful on Windows, where more than
|
|
* one interface can have the same name.
|
|
*/
|
|
if ((devnum = atoi(optarg)) != 0) {
|
|
if (devnum < 0)
|
|
error("Invalid adapter index");
|
|
|
|
if (pcap_findalldevs(&devpointer, ebuf) < 0)
|
|
error("%s", ebuf);
|
|
else {
|
|
for (i = 0; i < devnum-1; i++){
|
|
devpointer = devpointer->next;
|
|
if (devpointer == NULL)
|
|
error("Invalid adapter index");
|
|
}
|
|
}
|
|
device = devpointer->name;
|
|
break;
|
|
}
|
|
#endif /* HAVE_PCAP_FINDALLDEVS */
|
|
device = optarg;
|
|
break;
|
|
|
|
case 'l':
|
|
#ifdef WIN32
|
|
/*
|
|
* _IOLBF is the same as _IOFBF in Microsoft's C
|
|
* libraries; the only alternative they offer
|
|
* is _IONBF.
|
|
*
|
|
* XXX - this should really be checking for MSVC++,
|
|
* not WIN32, if, for example, MinGW has its own
|
|
* C library that is more UNIX-compatible.
|
|
*/
|
|
setvbuf(stdout, NULL, _IONBF, 0);
|
|
#else /* WIN32 */
|
|
#ifdef HAVE_SETLINEBUF
|
|
setlinebuf(stdout);
|
|
#else
|
|
setvbuf(stdout, NULL, _IOLBF, 0);
|
|
#endif
|
|
#endif /* WIN32 */
|
|
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
|
|
break;
|
|
|
|
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 if (strcasecmp(optarg, "tftp") == 0)
|
|
packettype = PT_TFTP;
|
|
else if (strcasecmp(optarg, "aodv") == 0)
|
|
packettype = PT_AODV;
|
|
else
|
|
error("unknown packet type `%s'", optarg);
|
|
break;
|
|
|
|
case 'u':
|
|
++uflag;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
case 'U':
|
|
++Uflag;
|
|
break;
|
|
#endif
|
|
|
|
case 'v':
|
|
++vflag;
|
|
break;
|
|
|
|
case 'w':
|
|
WFileName = optarg;
|
|
break;
|
|
|
|
case 'x':
|
|
++xflag;
|
|
break;
|
|
|
|
case 'X':
|
|
++xflag;
|
|
++Xflag;
|
|
break;
|
|
|
|
case 'y':
|
|
dlt_name = optarg;
|
|
dlt = pcap_datalink_name_to_val(dlt_name);
|
|
if (dlt < 0)
|
|
error("invalid data link type %s", dlt_name);
|
|
break;
|
|
|
|
#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
|
|
case 'Y':
|
|
{
|
|
/* Undocumented flag */
|
|
#ifdef HAVE_PCAP_DEBUG
|
|
extern int pcap_debug;
|
|
pcap_debug = 1;
|
|
#else
|
|
extern int yydebug;
|
|
yydebug = 1;
|
|
#endif
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
if (tflag > 0)
|
|
thiszone = gmt2local(0);
|
|
|
|
if (RFileName != NULL) {
|
|
int dlt;
|
|
const char *dlt_name;
|
|
|
|
#ifndef WIN32
|
|
/*
|
|
* We don't need network access, so relinquish any set-UID
|
|
* or set-GID privileges we have (if any).
|
|
*
|
|
* We do *not* want set-UID privileges when opening a
|
|
* trace file, as that might let the user read other
|
|
* people's trace files (especially if we're set-UID
|
|
* root).
|
|
*/
|
|
setuid(getuid());
|
|
#endif /* WIN32 */
|
|
pd = pcap_open_offline(RFileName, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
dlt = pcap_datalink(pd);
|
|
dlt_name = pcap_datalink_val_to_name(dlt);
|
|
if (dlt_name == NULL) {
|
|
fprintf(stderr, "reading from file %s, link-type %u\n",
|
|
RFileName, dlt);
|
|
} else {
|
|
fprintf(stderr,
|
|
"reading from file %s, link-type %s (%s)\n",
|
|
RFileName, dlt_name,
|
|
pcap_datalink_val_to_description(dlt));
|
|
}
|
|
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);
|
|
}
|
|
#ifdef WIN32
|
|
if(IsTextUnicode(device,
|
|
wcslen((short*)device), // Device always ends with a double \0, so this way to determine its
|
|
// length should be always valid
|
|
NULL))
|
|
{
|
|
fprintf(stderr, "%s: listening on %ws\n", program_name, device);
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: listening on %s\n", program_name, device);
|
|
}
|
|
|
|
fflush(stderr);
|
|
#endif /* WIN32 */
|
|
*ebuf = '\0';
|
|
pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
else if (*ebuf)
|
|
warning("%s", ebuf);
|
|
if (Lflag)
|
|
show_dlts_and_exit(pd);
|
|
if (dlt >= 0) {
|
|
#ifdef HAVE_PCAP_SET_DATALINK
|
|
if (pcap_set_datalink(pd, dlt) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
#else
|
|
/*
|
|
* We don't actually support changing the
|
|
* data link type, so we only let them
|
|
* set it to what it already is.
|
|
*/
|
|
if (dlt != pcap_datalink(pd)) {
|
|
error("%s is not one of the DLTs supported by this device\n",
|
|
dlt_name);
|
|
}
|
|
#endif
|
|
(void)fprintf(stderr, "%s: data link type %s\n",
|
|
program_name, dlt_name);
|
|
(void)fflush(stderr);
|
|
}
|
|
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.
|
|
*/
|
|
#ifndef WIN32
|
|
setuid(getuid());
|
|
#endif /* WIN32 */
|
|
}
|
|
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);
|
|
pcap_close(pd);
|
|
exit(0);
|
|
}
|
|
init_addrtoname(localnet, netmask);
|
|
|
|
#ifndef WIN32
|
|
(void)setsignal(SIGPIPE, cleanup);
|
|
#endif /* WIN32 */
|
|
(void)setsignal(SIGTERM, cleanup);
|
|
(void)setsignal(SIGINT, cleanup);
|
|
/* Cooperate with nohup(1) */
|
|
#ifndef WIN32
|
|
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
|
|
(void)setsignal(SIGHUP, oldhandler);
|
|
#endif /* WIN32 */
|
|
|
|
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));
|
|
if (Cflag != 0) {
|
|
callback = dump_packet_and_trunc;
|
|
dumpinfo.WFileName = WFileName;
|
|
dumpinfo.pd = pd;
|
|
dumpinfo.p = p;
|
|
pcap_userdata = (u_char *)&dumpinfo;
|
|
} else {
|
|
callback = dump_packet;
|
|
pcap_userdata = (u_char *)p;
|
|
}
|
|
} else {
|
|
type = pcap_datalink(pd);
|
|
printinfo.printer = lookup_printer(type);
|
|
if (printinfo.printer == NULL) {
|
|
dlt_name = pcap_datalink_val_to_name(type);
|
|
if (dlt_name != NULL)
|
|
error("unsupported data link type %s", dlt_name);
|
|
else
|
|
error("unsupported data link type %d", type);
|
|
}
|
|
callback = print_packet;
|
|
pcap_userdata = (u_char *)&printinfo;
|
|
}
|
|
#ifdef SIGINFO
|
|
(void)setsignal(SIGINFO, requestinfo);
|
|
#endif
|
|
#ifndef WIN32
|
|
if (RFileName == NULL) {
|
|
int dlt;
|
|
const char *dlt_name;
|
|
|
|
if (!vflag && !WFileName) {
|
|
(void)fprintf(stderr,
|
|
"%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
|
|
program_name);
|
|
} else
|
|
(void)fprintf(stderr, "%s: ", program_name);
|
|
dlt = pcap_datalink(pd);
|
|
dlt_name = pcap_datalink_val_to_name(dlt);
|
|
if (dlt_name == NULL) {
|
|
(void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
|
|
device, dlt, snaplen);
|
|
} else {
|
|
(void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
|
|
device, dlt_name,
|
|
pcap_datalink_val_to_description(dlt), snaplen);
|
|
}
|
|
(void)fflush(stderr);
|
|
}
|
|
#endif /* WIN32 */
|
|
status = pcap_loop(pd, cnt, callback, pcap_userdata);
|
|
if (WFileName == NULL) {
|
|
/*
|
|
* We're printing packets. Flush the printed output,
|
|
* so it doesn't get intermingled with error output.
|
|
*/
|
|
if (status == -2) {
|
|
/*
|
|
* We got interrupted, so perhaps we didn't
|
|
* manage to finish a line we were printing.
|
|
* Print an extra newline, just in case.
|
|
*/
|
|
putchar('\n');
|
|
}
|
|
(void)fflush(stdout);
|
|
}
|
|
if (status == -1) {
|
|
/*
|
|
* Error. Report it.
|
|
*/
|
|
(void)fprintf(stderr, "%s: pcap_loop: %s\n",
|
|
program_name, pcap_geterr(pd));
|
|
}
|
|
if (RFileName == NULL) {
|
|
/*
|
|
* We're doing a live capture. Report the capture
|
|
* statistics.
|
|
*/
|
|
info(1);
|
|
}
|
|
pcap_close(pd);
|
|
exit(status == -1 ? 1 : 0);
|
|
}
|
|
|
|
/* make a clean exit on interrupts */
|
|
static RETSIGTYPE
|
|
cleanup(int signo _U_)
|
|
{
|
|
#ifdef HAVE_PCAP_BREAKLOOP
|
|
/*
|
|
* We have "pcap_breakloop()"; use it, so that we do as little
|
|
* as possible in the signal handler (it's probably not safe
|
|
* to do anything with standard I/O streams in a signal handler -
|
|
* the ANSI C standard doesn't say it is).
|
|
*/
|
|
pcap_breakloop(pd);
|
|
#else
|
|
/*
|
|
* We don't have "pcap_breakloop()"; this isn't safe, but
|
|
* it's the best we can do. Print the summary if we're
|
|
* not reading from a savefile - i.e., if we're doing a
|
|
* live capture - and exit.
|
|
*/
|
|
if (pd != NULL && pcap_file(pd) == NULL) {
|
|
/*
|
|
* We got interrupted, so perhaps we didn't
|
|
* manage to finish a line we were printing.
|
|
* Print an extra newline, just in case.
|
|
*/
|
|
putchar('\n');
|
|
(void)fflush(stdout);
|
|
info(1);
|
|
}
|
|
exit(0);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
info(register int verbose)
|
|
{
|
|
struct pcap_stat stat;
|
|
|
|
if (pcap_stats(pd, &stat) < 0) {
|
|
(void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
|
|
return;
|
|
}
|
|
|
|
if (!verbose)
|
|
fprintf(stderr, "%s: ", program_name);
|
|
|
|
(void)fprintf(stderr, "%u packets captured", packets_captured);
|
|
if (!verbose)
|
|
fputs(", ", stderr);
|
|
else
|
|
putc('\n', stderr);
|
|
(void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
|
|
if (!verbose)
|
|
fputs(", ", stderr);
|
|
else
|
|
putc('\n', stderr);
|
|
(void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
|
|
infoprint = 0;
|
|
}
|
|
|
|
static void
|
|
reverse(char *s)
|
|
{
|
|
int i, j, c;
|
|
|
|
for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
|
|
c = s[i];
|
|
s[i] = s[j];
|
|
s[j] = c;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
swebitoa(unsigned int n, char *s)
|
|
{
|
|
unsigned int i;
|
|
|
|
i = 0;
|
|
do {
|
|
s[i++] = n % 10 + '0';
|
|
} while ((n /= 10) > 0);
|
|
|
|
s[i] = '\0';
|
|
reverse(s);
|
|
}
|
|
|
|
static void
|
|
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
struct dump_info *dump_info;
|
|
static uint cnt = 2;
|
|
char *name;
|
|
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
|
|
dump_info = (struct dump_info *)user;
|
|
|
|
/*
|
|
* XXX - this won't prevent capture files from getting
|
|
* larger than Cflag - the last packet written to the
|
|
* file could put it over Cflag.
|
|
*/
|
|
if (ftell((FILE *)dump_info->p) > Cflag) {
|
|
/*
|
|
* Close the current file and open a new one.
|
|
*/
|
|
pcap_dump_close(dump_info->p);
|
|
if (cnt >= 1000)
|
|
error("too many output files");
|
|
name = (char *) malloc(strlen(dump_info->WFileName) + 4);
|
|
if (name == NULL)
|
|
error("dump_packet_and_trunc: malloc");
|
|
strcpy(name, dump_info->WFileName);
|
|
swebitoa(cnt, name + strlen(dump_info->WFileName));
|
|
cnt++;
|
|
dump_info->p = pcap_dump_open(dump_info->pd, name);
|
|
free(name);
|
|
if (dump_info->p == NULL)
|
|
error("%s", pcap_geterr(pd));
|
|
}
|
|
|
|
pcap_dump((u_char *)dump_info->p, h, sp);
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
if (Uflag)
|
|
pcap_dump_flush(dump_info->p);
|
|
#endif
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
static void
|
|
dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
|
|
pcap_dump(user, h, sp);
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
if (Uflag)
|
|
pcap_dump_flush((pcap_dumper_t *)user);
|
|
#endif
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
static void
|
|
print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
struct print_info *print_info;
|
|
u_int hdrlen;
|
|
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
ts_print(&h->ts);
|
|
|
|
print_info = (struct print_info *)user;
|
|
|
|
/*
|
|
* Some printers want to check that they're not walking off the
|
|
* end of the packet.
|
|
* Rather than pass it all the way down, we set this global.
|
|
*/
|
|
snapend = sp + h->caplen;
|
|
|
|
hdrlen = (*print_info->printer)(h, sp);
|
|
if (xflag) {
|
|
/*
|
|
* Print the raw packet data.
|
|
*/
|
|
if (xflag > 1) {
|
|
/*
|
|
* Include the link-layer header.
|
|
*/
|
|
default_print(sp, h->caplen);
|
|
} else {
|
|
/*
|
|
* Don't include the link-layer header - and if
|
|
* we have nothing past the link-layer header,
|
|
* print nothing.
|
|
*/
|
|
if (h->caplen > hdrlen)
|
|
default_print(sp + hdrlen,
|
|
h->caplen - hdrlen);
|
|
}
|
|
}
|
|
|
|
putchar('\n');
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
#ifdef WIN32
|
|
/*
|
|
* XXX - there should really be libpcap calls to get the version
|
|
* number as a string (the string would be generated from #defines
|
|
* at run time, so that it's not generated from string constants
|
|
* in the library, as, on many UNIX systems, those constants would
|
|
* be statically linked into the application executable image, and
|
|
* would thus reflect the version of libpcap on the system on
|
|
* which the application was *linked*, not the system on which it's
|
|
* *running*.
|
|
*
|
|
* That routine should be documented, unlike the "version[]"
|
|
* string, so that UNIX vendors providing their own libpcaps
|
|
* don't omit it (as a couple of vendors have...).
|
|
*
|
|
* Packet.dll should perhaps also export a routine to return the
|
|
* version number of the Packet.dll code, to supply the
|
|
* "Wpcap_version" information on Windows.
|
|
*/
|
|
char WDversion[]="current-cvs.tcpdump.org";
|
|
char version[]="current-cvs.tcpdump.org";
|
|
char pcap_version[]="current-cvs.tcpdump.org";
|
|
char Wpcap_version[]="3.0 alpha";
|
|
#endif
|
|
|
|
/*
|
|
* By default, print the specified data out in hex.
|
|
*/
|
|
void
|
|
default_print(register const u_char *bp, register u_int length)
|
|
{
|
|
ascii_print("\n\t", bp, length); /* pass on lf and identation string */
|
|
}
|
|
|
|
#ifdef SIGINFO
|
|
RETSIGTYPE requestinfo(int signo _U_)
|
|
{
|
|
if (infodelay)
|
|
++infoprint;
|
|
else
|
|
info(0);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
extern char version[];
|
|
#ifndef HAVE_PCAP_LIB_VERSION
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#if defined(WIN32) || defined(HAVE_PCAP_VERSION)
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extern char pcap_version[];
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#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
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static char pcap_version[] = "unknown";
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#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
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#endif /* HAVE_PCAP_LIB_VERSION */
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#ifdef HAVE_PCAP_LIB_VERSION
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(void)fprintf(stderr, "%s version %s\n", program_name, version);
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(void)fprintf(stderr, "%s\n", pcap_lib_version());
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#else /* HAVE_PCAP_LIB_VERSION */
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#ifdef WIN32
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(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
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(void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
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#else /* WIN32 */
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(void)fprintf(stderr, "%s version %s\n", program_name, version);
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(void)fprintf(stderr, "libpcap version %s\n", pcap_version);
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#endif /* WIN32 */
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#endif /* HAVE_PCAP_LIB_VERSION */
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(void)fprintf(stderr,
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"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
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(void)fprintf(stderr,
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"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n");
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(void)fprintf(stderr,
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"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n");
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(void)fprintf(stderr,
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"\t\t[ expression ]\n");
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exit(1);
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}
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