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Tcpdump.c
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Tcpdump.c
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/*
* 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 <[email protected]>
*/
#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 1.253.2.12 2006/02/01 14:39:56 hannes Exp $ (LBL)";
#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 "win32/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 */
#ifdef HAVE_SMI_H
#include <smi.h>
#endif
#include <pcap.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef WIN32
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#endif /* WIN32 */
#include "netdissect.h"
#include "interface.h"
#include "addrtoname.h"
#include "machdep.h"
#include "setsignal.h"
#include "gmt2local.h"
#include "pcap-missing.h"
netdissect_options Gndo;
netdissect_options *gndo = &Gndo;
/*
* Define the maximum number of files for the -C flag, and how many
* characters can be added to a filename for the -C flag (which
* should be enough to handle MAX_CFLAG - 1).
*/
#define MAX_CFLAG 1000000
#define MAX_CFLAG_CHARS 6
int dflag; /* print filter code */
int Lflag; /* list available data link types and exit */
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 ndo_default_print(netdissect_options *, const u_char *, u_int);
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 *);
static void droproot(const char *, const char *);
static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
#ifdef SIGINFO
RETSIGTYPE requestinfo(int);
#endif
#if defined(USE_WIN32_MM_TIMER)
#include <MMsystem.h>
static UINT timer_id;
static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
#elif defined(HAVE_ALARM)
static void verbose_stats_dump(int sig);
#endif
static void info(int);
static u_int packets_captured;
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_WITHDIRECTION
{ ppp_if_print, DLT_PPP_WITHDIRECTION },
#endif
#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_SYMANTEC_FIREWALL
{ symantec_if_print, DLT_SYMANTEC_FIREWALL },
#endif
#ifdef DLT_APPLE_IP_OVER_IEEE1394
{ ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
#endif
#ifdef DLT_JUNIPER_ATM1
{ juniper_atm1_print, DLT_JUNIPER_ATM1 },
#endif
#ifdef DLT_JUNIPER_ATM2
{ juniper_atm2_print, DLT_JUNIPER_ATM2 },
#endif
#ifdef DLT_JUNIPER_MFR
{ juniper_mfr_print, DLT_JUNIPER_MFR },
#endif
#ifdef DLT_JUNIPER_MLFR
{ juniper_mlfr_print, DLT_JUNIPER_MLFR },
#endif
#ifdef DLT_JUNIPER_MLPPP
{ juniper_mlppp_print, DLT_JUNIPER_MLPPP },
#endif
#ifdef DLT_JUNIPER_PPPOE
{ juniper_pppoe_print, DLT_JUNIPER_PPPOE },
#endif
#ifdef DLT_JUNIPER_PPPOE_ATM
{ juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
#endif
#ifdef DLT_JUNIPER_GGSN
{ juniper_ggsn_print, DLT_JUNIPER_GGSN },
#endif
#ifdef DLT_JUNIPER_ES
{ juniper_es_print, DLT_JUNIPER_ES },
#endif
#ifdef DLT_JUNIPER_MONITOR
{ juniper_monitor_print, DLT_JUNIPER_MONITOR },
#endif
#ifdef DLT_JUNIPER_SERVICES
{ juniper_services_print, DLT_JUNIPER_SERVICES },
#endif
#ifdef DLT_JUNIPER_ETHER
{ juniper_ether_print, DLT_JUNIPER_ETHER },
#endif
#ifdef DLT_JUNIPER_PPP
{ juniper_ppp_print, DLT_JUNIPER_PPP },
#endif
#ifdef DLT_JUNIPER_FRELAY
{ juniper_frelay_print, DLT_JUNIPER_FRELAY },
#endif
#ifdef DLT_JUNIPER_CHDLC
{ juniper_chdlc_print, DLT_JUNIPER_CHDLC },
#endif
#ifdef DLT_MFR
{ mfr_if_print, DLT_MFR },
#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
#ifndef HAVE_PCAP_IF_T
#undef HAVE_PCAP_FINDALLDEVS
#endif
#endif
#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
#ifndef WIN32
/* Drop root privileges and chroot if necessary */
static void
droproot(const char *username, const char *chroot_dir)
{
struct passwd *pw = NULL;
if (chroot_dir && !username) {
fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
exit(1);
}
pw = getpwnam(username);
if (pw) {
if (chroot_dir) {
if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
chroot_dir, pcap_strerror(errno));
exit(1);
}
}
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
username,
(unsigned long)pw->pw_uid,
(unsigned long)pw->pw_gid,
pcap_strerror(errno));
exit(1);
}
}
else {
fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
username);
exit(1);
}
}
#endif /* WIN32 */
static int
getWflagChars(int x)
{
int c = 0;
x -= 1;
while (x > 0) {
c += 1;
x /= 10;
}
return c;
}
static void
MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
{
if (cnt == 0 && max_chars == 0)
strcpy(buffer, orig_name);
else
sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
}
static int tcpdump_printf(netdissect_options *ndo _U_,
const char *fmt, ...)
{
va_list args;
int ret;
va_start(args, fmt);
ret=vfprintf(stdout, fmt, args);
va_end(args);
return ret;
}
static void init_npcap_dll_path()
{
BOOL(WINAPI *SetDllDirectory)(LPCTSTR);
char sysdir_name[512];
int len;
SetDllDirectory = (BOOL(WINAPI *)(LPCTSTR)) GetProcAddress(GetModuleHandle("kernel32.dll"), "SetDllDirectoryA");
if (SetDllDirectory == NULL) {
error("Error in SetDllDirectory");
}
else {
len = GetSystemDirectory(sysdir_name, 480); // be safe
if (!len)
error("Error in GetSystemDirectory (%d)", GetLastError());
strcat(sysdir_name, "\\Npcap");
if (SetDllDirectory(sysdir_name) == 0)
error("Error in SetDllDirectory(\"System32\\Npcap\")");
}
}
int
main(int argc, char **argv)
{
register int cnt, op, i;
bpf_u_int32 localnet, netmask;
register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
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];
char *username = NULL;
char *chroot_dir = NULL;
#ifdef HAVE_PCAP_FINDALLDEVS
pcap_if_t *devpointer;
int devnum;
#endif
int status;
init_npcap_dll_path();
#ifdef WIN32
u_int UserBufferSize = 1000000;
// if(wsockinit() != 0) return 1;
#endif /* WIN32 */
gndo->ndo_Oflag=1;
gndo->ndo_Rflag=1;
gndo->ndo_dlt=-1;
gndo->ndo_default_print=ndo_default_print;
gndo->ndo_printf=tcpdump_printf;
gndo->ndo_error=ndo_error;
gndo->ndo_warning=ndo_warning;
gndo->ndo_snaplen = DEFAULT_SNAPLEN;
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:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)
switch (op) {
case 'a':
/* compatibility for old -a */
break;
case 'A':
++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
gndo->ndo_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 'M':
/* TCP-MD5 shared secret */
#ifndef HAVE_LIBCRYPTO
warning("crypto code not compiled in");
#endif
tcpmd5secret = optarg;
break;
case 'O':
Oflag = 0;
break;
case 'p':
++pflag;
break;
case 'q':
++qflag;
++suppress_default_print;
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 'W':
Wflag = atoi(optarg);
if (Wflag < 0)
error("invalid number of output files %s", optarg);
WflagChars = getWflagChars(Wflag);
break;
case 'x':
++xflag;
++suppress_default_print;
break;
case 'X':
++Xflag;
++suppress_default_print;
break;
case 'y':
gndo->ndo_dltname = optarg;
gndo->ndo_dlt =
pcap_datalink_name_to_val(gndo->ndo_dltname);
if (gndo->ndo_dlt < 0)
error("invalid data link type %s", gndo->ndo_dltname);
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
case 'Z':
if (optarg) {
username = strdup(optarg);
}
else {
usage();
/* NOTREACHED */
}
break;
default:
usage();
/* NOTREACHED */
}
switch (tflag) {
case 0: /* Default */
case 4: /* Default + Date*/
thiszone = gmt2local(0);
break;
case 1: /* No time stamp */
case 2: /* Unix timeval style */
case 3: /* Microseconds since previous packet */
break;
default: /* Not supported */
error("only -t, -tt, -ttt, and -tttt are supported");
break;
}
#ifdef WITH_CHROOT
/* if run as root, prepare for chrooting */
if (getuid() == 0 || geteuid() == 0) {
/* future extensibility for cmd-line arguments */
if (!chroot_dir)
chroot_dir = WITH_CHROOT;
}
#endif
#ifdef WITH_USER
/* if run as root, prepare for dropping root privileges */
if (getuid() == 0 || geteuid() == 0) {
/* Run with '-Z root' to restore old behaviour */
if (!username)
username = WITH_USER;
}
#endif
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).
*/
if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
fprintf(stderr, "Warning: setgid/setuid failed !\n");
#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) {
// pcap_lookupdev() will return Unicode string,
// which will cause fault if passed to pcap_open() which accepts ASCII.
// So we don't use it any more.
// See: https://github.com/the-tcpdump-group/libpcap/issues/562
// device = pcap_lookupdev(ebuf);
// if (device == NULL)
// error("%s", ebuf);
if (pcap_findalldevs(&devpointer, ebuf) < 0)
error("%s", ebuf);
if (devpointer == NULL)
error("%s", "no adapter available");
device = devpointer->name;
}
#ifdef WIN32
if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
{ //a Unicode string has a \0 as second byte (so strlen() is 1)
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);
pd = pcap_open(device, snaplen, 0, 1000, NULL, ebuf); //PCAP_OPENFLAG_NOCAPTURE_LOCAL
if (pd == NULL)
error("%s", ebuf);
else if (*ebuf)
warning("%s", ebuf);
/*
* Let user own process after socket has been opened.
*/
#ifndef WIN32
if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
fprintf(stderr, "Warning: setgid/setuid failed !\n");
#endif /* WIN32 */
#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 (gndo->ndo_dlt >= 0) {
#ifdef HAVE_PCAP_SET_DATALINK
if (pcap_set_datalink(pd, gndo->ndo_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 (gndo->ndo_dlt != pcap_datalink(pd)) {
error("%s is not one of the DLTs supported by this device\n",
gndo->ndo_dltname);
}
#endif
(void)fprintf(stderr, "%s: data link type %s\n",
program_name, gndo->ndo_dltname);
(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);
}
}
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;