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NetBSD/dist/tcpdump/tcpdump.c

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/* $NetBSD: tcpdump.c,v 1.7 2004/09/27 23:04:25 dyoung 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.
*
* Support for splitting captures into multiple files with a maximum
* file size:
*
* Copyright (c) 2001
* Seth Webster <swebster@sst.ll.mit.edu>
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
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)";
#else
__RCSID("$NetBSD: tcpdump.c,v 1.7 2004/09/27 23:04:25 dyoung 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 <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>
#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);
#ifdef WIN32
if(UserBufferSize != 1000000)
if(pcap_setbuff(pd, UserBufferSize)==-1){
error("%s", pcap_geterr(pd));
}
#endif /* WIN32 */
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
#if defined(WIN32) || defined(HAVE_PCAP_VERSION)
extern char pcap_version[];
#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
static char pcap_version[] = "unknown";
#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
#endif /* HAVE_PCAP_LIB_VERSION */
#ifdef HAVE_PCAP_LIB_VERSION
(void)fprintf(stderr, "%s version %s\n", program_name, version);
(void)fprintf(stderr, "%s\n", pcap_lib_version());
#else /* HAVE_PCAP_LIB_VERSION */
#ifdef WIN32
(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
(void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
#else /* WIN32 */
(void)fprintf(stderr, "%s version %s\n", program_name, version);
(void)fprintf(stderr, "libpcap version %s\n", pcap_version);
#endif /* WIN32 */
#endif /* HAVE_PCAP_LIB_VERSION */
(void)fprintf(stderr,
"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
(void)fprintf(stderr,
"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -r file ]\n");
(void)fprintf(stderr,
"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -y datalinktype ]\n");
(void)fprintf(stderr,
"\t\t[ expression ]\n");
exit(1);
}
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