1430 lines
33 KiB
C
1430 lines
33 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Support for splitting captures into multiple files with a maximum
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* file size:
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*
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* Copyright (c) 2001
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* Seth Webster <swebster@sst.ll.mit.edu>
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*/
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#ifndef lint
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static const char copyright[] _U_ =
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"@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
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The Regents of the University of California. All rights reserved.\n";
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.253.2.8 2005/07/05 21:09:05 mcr Exp $ (LBL)";
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#endif
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/* $FreeBSD$ */
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/*
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* tcpdump - monitor tcp/ip traffic on an ethernet.
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*
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* First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
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* Mercilessly hacked and occasionally improved since then via the
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* combined efforts of Van, Steve McCanne and Craig Leres of LBL.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#ifdef WIN32
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#include "getopt.h"
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#include "w32_fzs.h"
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extern int strcasecmp (const char *__s1, const char *__s2);
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extern int SIZE_BUF;
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#define off_t long
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#define uint UINT
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#endif /* WIN32 */
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#ifdef HAVE_SMI_H
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#include <smi.h>
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#endif
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#include <pcap.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef WIN32
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#include <pwd.h>
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#include <grp.h>
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#include <errno.h>
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#endif /* WIN32 */
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#include "netdissect.h"
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#include "interface.h"
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#include "addrtoname.h"
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#include "machdep.h"
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#include "setsignal.h"
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#include "gmt2local.h"
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#include "pcap-missing.h"
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netdissect_options Gndo;
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netdissect_options *gndo = &Gndo;
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/*
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* Define the maximum number of files for the -C flag, and how many
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* characters can be added to a filename for the -C flag (which
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* should be enough to handle MAX_CFLAG - 1).
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*/
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#define MAX_CFLAG 1000000
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#define MAX_CFLAG_CHARS 6
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int dflag; /* print filter code */
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int Lflag; /* list available data link types and exit */
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static int infodelay;
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static int infoprint;
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char *program_name;
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int32_t thiszone; /* seconds offset from gmt to local time */
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/* Forwards */
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static RETSIGTYPE cleanup(int);
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static void usage(void) __attribute__((noreturn));
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static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
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static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
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static void ndo_default_print(netdissect_options *, const u_char *, u_int);
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static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
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static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
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static void droproot(const char *, const char *);
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static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
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static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
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#ifdef SIGINFO
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RETSIGTYPE requestinfo(int);
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#endif
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#if defined(USE_WIN32_MM_TIMER)
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#include <MMsystem.h>
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static UINT timer_id;
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static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
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#elif defined(HAVE_ALARM)
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static void verbose_stats_dump(int sig);
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#endif
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static void info(int);
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static u_int packets_captured;
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typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
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struct printer {
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if_printer f;
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int type;
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};
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static struct printer printers[] = {
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{ arcnet_if_print, DLT_ARCNET },
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#ifdef DLT_ARCNET_LINUX
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{ arcnet_linux_if_print, DLT_ARCNET_LINUX },
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#endif
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{ ether_if_print, DLT_EN10MB },
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{ token_if_print, DLT_IEEE802 },
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#ifdef DLT_LANE8023
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{ lane_if_print, DLT_LANE8023 },
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#endif
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#ifdef DLT_CIP
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{ cip_if_print, DLT_CIP },
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#endif
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#ifdef DLT_ATM_CLIP
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{ cip_if_print, DLT_ATM_CLIP },
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#endif
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{ sl_if_print, DLT_SLIP },
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#ifdef DLT_SLIP_BSDOS
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{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
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#endif
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{ ppp_if_print, DLT_PPP },
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#ifdef DLT_PPP_WITHDIRECTION
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{ ppp_if_print, DLT_PPP_WITHDIRECTION },
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#endif
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#ifdef DLT_PPP_BSDOS
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{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
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#endif
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{ fddi_if_print, DLT_FDDI },
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{ null_if_print, DLT_NULL },
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#ifdef DLT_LOOP
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{ null_if_print, DLT_LOOP },
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#endif
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{ raw_if_print, DLT_RAW },
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{ atm_if_print, DLT_ATM_RFC1483 },
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#ifdef DLT_C_HDLC
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{ chdlc_if_print, DLT_C_HDLC },
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#endif
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#ifdef DLT_HDLC
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{ chdlc_if_print, DLT_HDLC },
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#endif
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#ifdef DLT_PPP_SERIAL
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{ ppp_hdlc_if_print, DLT_PPP_SERIAL },
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#endif
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#ifdef DLT_PPP_ETHER
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{ pppoe_if_print, DLT_PPP_ETHER },
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#endif
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#ifdef DLT_LINUX_SLL
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{ sll_if_print, DLT_LINUX_SLL },
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#endif
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#ifdef DLT_IEEE802_11
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{ ieee802_11_if_print, DLT_IEEE802_11},
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#endif
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#ifdef DLT_LTALK
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{ ltalk_if_print, DLT_LTALK },
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#endif
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#ifdef DLT_PFLOG
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{ pflog_if_print, DLT_PFLOG },
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#endif
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#ifdef DLT_FR
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{ fr_if_print, DLT_FR },
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#endif
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#ifdef DLT_FRELAY
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{ fr_if_print, DLT_FRELAY },
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#endif
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#ifdef DLT_SUNATM
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{ sunatm_if_print, DLT_SUNATM },
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#endif
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#ifdef DLT_IP_OVER_FC
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{ ipfc_if_print, DLT_IP_OVER_FC },
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#endif
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#ifdef DLT_PRISM_HEADER
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{ prism_if_print, DLT_PRISM_HEADER },
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#endif
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#ifdef DLT_IEEE802_11_RADIO
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{ ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
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#endif
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#ifdef DLT_ENC
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{ enc_if_print, DLT_ENC },
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#endif
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#ifdef DLT_SYMANTEC_FIREWALL
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{ symantec_if_print, DLT_SYMANTEC_FIREWALL },
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#endif
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#ifdef DLT_APPLE_IP_OVER_IEEE1394
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{ ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
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#endif
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#ifdef DLT_JUNIPER_ATM1
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{ juniper_atm1_print, DLT_JUNIPER_ATM1 },
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#endif
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#ifdef DLT_JUNIPER_ATM2
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{ juniper_atm2_print, DLT_JUNIPER_ATM2 },
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#endif
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#ifdef DLT_JUNIPER_MFR
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{ juniper_mfr_print, DLT_JUNIPER_MFR },
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#endif
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#ifdef DLT_JUNIPER_MLFR
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{ juniper_mlfr_print, DLT_JUNIPER_MLFR },
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#endif
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#ifdef DLT_JUNIPER_MLPPP
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{ juniper_mlppp_print, DLT_JUNIPER_MLPPP },
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#endif
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#ifdef DLT_JUNIPER_PPPOE
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{ juniper_pppoe_print, DLT_JUNIPER_PPPOE },
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#endif
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#ifdef DLT_JUNIPER_PPPOE_ATM
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{ juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
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#endif
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#ifdef DLT_JUNIPER_GGSN
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{ juniper_ggsn_print, DLT_JUNIPER_GGSN },
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#endif
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#ifdef DLT_JUNIPER_ES
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{ juniper_es_print, DLT_JUNIPER_ES },
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#endif
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#ifdef DLT_JUNIPER_MONITOR
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{ juniper_monitor_print, DLT_JUNIPER_MONITOR },
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#endif
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#ifdef DLT_JUNIPER_SERVICES
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{ juniper_services_print, DLT_JUNIPER_SERVICES },
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#endif
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{ NULL, 0 },
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};
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static if_printer
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lookup_printer(int type)
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{
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struct printer *p;
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for (p = printers; p->f; ++p)
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if (type == p->type)
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return p->f;
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return NULL;
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/* NOTREACHED */
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}
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static pcap_t *pd;
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extern int optind;
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extern int opterr;
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extern char *optarg;
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struct print_info {
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if_printer printer;
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};
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struct dump_info {
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char *WFileName;
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pcap_t *pd;
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pcap_dumper_t *p;
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};
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static void
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show_dlts_and_exit(pcap_t *pd)
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{
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int n_dlts;
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int *dlts = 0;
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const char *dlt_name;
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n_dlts = pcap_list_datalinks(pd, &dlts);
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if (n_dlts < 0)
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error("%s", pcap_geterr(pd));
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else if (n_dlts == 0 || !dlts)
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error("No data link types.");
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(void) fprintf(stderr, "Data link types (use option -y to set):\n");
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while (--n_dlts >= 0) {
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dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
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if (dlt_name != NULL) {
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(void) fprintf(stderr, " %s (%s)", dlt_name,
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pcap_datalink_val_to_description(dlts[n_dlts]));
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/*
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* OK, does tcpdump handle that type?
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*/
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if (lookup_printer(dlts[n_dlts]) == NULL)
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(void) fprintf(stderr, " (not supported)");
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putchar('\n');
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} else {
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(void) fprintf(stderr, " DLT %d (not supported)\n",
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dlts[n_dlts]);
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}
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}
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free(dlts);
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exit(0);
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}
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/*
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* Set up flags that might or might not be supported depending on the
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* version of libpcap we're using.
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*/
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#ifdef WIN32
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#define B_FLAG "B:"
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#define B_FLAG_USAGE " [ -B size ]"
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#else /* WIN32 */
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#define B_FLAG
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#define B_FLAG_USAGE
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#endif /* WIN32 */
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#ifdef HAVE_PCAP_FINDALLDEVS
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#ifndef HAVE_PCAP_IF_T
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#undef HAVE_PCAP_FINDALLDEVS
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#endif
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#endif
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#ifdef HAVE_PCAP_FINDALLDEVS
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#define D_FLAG "D"
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#else
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#define D_FLAG
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#endif
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#ifdef HAVE_PCAP_DUMP_FLUSH
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#define U_FLAG "U"
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#else
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#define U_FLAG
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#endif
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#ifndef WIN32
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/* Drop root privileges and chroot if necessary */
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static void
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droproot(const char *username, const char *chroot_dir)
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{
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struct passwd *pw = NULL;
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if (chroot_dir && !username) {
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fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
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exit(1);
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}
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pw = getpwnam(username);
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if (pw) {
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if (chroot_dir) {
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if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
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fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
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chroot_dir, pcap_strerror(errno));
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exit(1);
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}
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}
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if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
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setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
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fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
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username,
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(unsigned long)pw->pw_uid,
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(unsigned long)pw->pw_gid,
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pcap_strerror(errno));
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exit(1);
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}
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}
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else {
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fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
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username);
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exit(1);
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}
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}
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#endif /* WIN32 */
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static int
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getWflagChars(int x)
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{
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int c = 0;
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x -= 1;
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while (x > 0) {
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c += 1;
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x /= 10;
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}
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return c;
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}
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static void
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MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
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{
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if (cnt == 0 && max_chars == 0)
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strcpy(buffer, orig_name);
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else
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sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
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}
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static int tcpdump_printf(netdissect_options *ndo _U_,
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const char *fmt, ...)
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{
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va_list args;
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int ret;
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va_start(args, fmt);
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ret=vfprintf(stdout, fmt, args);
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va_end(args);
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return ret;
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}
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int
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main(int argc, char **argv)
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{
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register int cnt, op, i;
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bpf_u_int32 localnet, netmask;
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register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
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pcap_handler callback;
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int type;
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struct bpf_program fcode;
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#ifndef WIN32
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RETSIGTYPE (*oldhandler)(int);
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#endif
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struct print_info printinfo;
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|
struct dump_info dumpinfo;
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u_char *pcap_userdata;
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char ebuf[PCAP_ERRBUF_SIZE];
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char *username = NULL;
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char *chroot_dir = NULL;
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#ifdef HAVE_PCAP_FINDALLDEVS
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|
pcap_if_t *devpointer;
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int devnum;
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|
#endif
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|
int status;
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|
#ifdef WIN32
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|
u_int UserBufferSize = 1000000;
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if(wsockinit() != 0) return 1;
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#endif /* WIN32 */
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gndo->ndo_Oflag=1;
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gndo->ndo_Rflag=1;
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gndo->ndo_dlt=-1;
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gndo->ndo_default_print=ndo_default_print;
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gndo->ndo_printf=tcpdump_printf;
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gndo->ndo_error=ndo_error;
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|
gndo->ndo_warning=ndo_warning;
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gndo->ndo_snaplen = DEFAULT_SNAPLEN;
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cnt = -1;
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device = NULL;
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infile = NULL;
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RFileName = NULL;
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WFileName = NULL;
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if ((cp = strrchr(argv[0], '/')) != NULL)
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program_name = cp + 1;
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else
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program_name = argv[0];
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|
if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
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error("%s", ebuf);
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|
|
#ifdef LIBSMI
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|
smiInit("tcpdump");
|
|
#endif
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|
|
|
opterr = 0;
|
|
while (
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|
(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)
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|
switch (op) {
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|
|
case 'a':
|
|
/* compatibility for old -a */
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|
break;
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|
|
|
case 'A':
|
|
++xflag;
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|
++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;
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|
|
|
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;
|
|
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;
|
|
break;
|
|
|
|
case 'X':
|
|
++Xflag;
|
|
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) {
|
|
device = pcap_lookupdev(ebuf);
|
|
if (device == NULL)
|
|
error("%s", ebuf);
|
|
}
|
|
#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);
|
|
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;
|
|
|
|
WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
|
|
if (WFileNameAlt == NULL)
|
|
error("malloc of WFileNameAlt");
|
|
MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
|
|
p = pcap_dump_open(pd, WFileNameAlt);
|
|
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) {
|
|
gndo->ndo_dltname = pcap_datalink_val_to_name(type);
|
|
if (gndo->ndo_dltname != NULL)
|
|
error("unsupported data link type %s",
|
|
gndo->ndo_dltname);
|
|
else
|
|
error("unsupported data link type %d", type);
|
|
}
|
|
callback = print_packet;
|
|
pcap_userdata = (u_char *)&printinfo;
|
|
}
|
|
#ifndef WIN32
|
|
/*
|
|
* We cannot do this earlier, because we want to be able to open
|
|
* the file (if done) for writing before giving up permissions.
|
|
*/
|
|
if (getuid() == 0 || geteuid() == 0) {
|
|
if (username || chroot_dir)
|
|
droproot(username, chroot_dir);
|
|
}
|
|
#endif /* WIN32 */
|
|
#ifdef SIGINFO
|
|
(void)setsignal(SIGINFO, requestinfo);
|
|
#endif
|
|
|
|
if (vflag > 0 && WFileName) {
|
|
/*
|
|
* When capturing to a file, "-v" means tcpdump should,
|
|
* every 10 secodns, "v"erbosely report the number of
|
|
* packets captured.
|
|
*/
|
|
#ifdef USE_WIN32_MM_TIMER
|
|
/* call verbose_stats_dump() each 1000 +/-100msec */
|
|
timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
|
|
setvbuf(stderr, NULL, _IONBF, 0);
|
|
#elif defined(HAVE_ALARM)
|
|
(void)setsignal(SIGALRM, verbose_stats_dump);
|
|
alarm(1);
|
|
#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 USE_WIN32_MM_TIMER
|
|
if (timer_id)
|
|
timeKillEvent(timer_id);
|
|
timer_id = 0;
|
|
#elif defined(HAVE_ALARM)
|
|
alarm(0);
|
|
#endif
|
|
|
|
#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
|
|
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
struct dump_info *dump_info;
|
|
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 (pcap_dump_ftell(dump_info->p) > Cflag) {
|
|
/*
|
|
* Close the current file and open a new one.
|
|
*/
|
|
pcap_dump_close(dump_info->p);
|
|
Cflag_count++;
|
|
if (Wflag > 0) {
|
|
if (Cflag_count >= Wflag)
|
|
Cflag_count = 0;
|
|
} else {
|
|
if (Cflag_count >= MAX_CFLAG)
|
|
error("too many output files");
|
|
}
|
|
name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
|
|
if (name == NULL)
|
|
error("dump_packet_and_trunc: malloc");
|
|
MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
|
|
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.
|
|
*/
|
|
hex_print("\n\t", 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)
|
|
hex_print("\n\t", sp + hdrlen,
|
|
h->caplen - hdrlen);
|
|
}
|
|
} else if (Xflag) {
|
|
/*
|
|
* Print the raw packet data.
|
|
*/
|
|
if (Xflag > 1) {
|
|
/*
|
|
* Include the link-layer header.
|
|
*/
|
|
ascii_print("\n\t", 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)
|
|
ascii_print("\n\t", 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";
|
|
#if !defined(HAVE_GENERATED_VERSION)
|
|
char version[]="current-cvs.tcpdump.org";
|
|
#endif
|
|
char pcap_version[]="current-cvs.tcpdump.org";
|
|
char Wpcap_version[]="3.1";
|
|
#endif
|
|
|
|
/*
|
|
* By default, print the specified data out in hex.
|
|
*/
|
|
static void
|
|
ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
|
|
{
|
|
ascii_print("\n\t", bp, length); /* pass on lf and identation string */
|
|
}
|
|
|
|
void
|
|
default_print(const u_char *bp, u_int length)
|
|
{
|
|
ndo_default_print(gndo, bp, length);
|
|
}
|
|
|
|
#ifdef SIGINFO
|
|
RETSIGTYPE requestinfo(int signo _U_)
|
|
{
|
|
if (infodelay)
|
|
++infoprint;
|
|
else
|
|
info(0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Called once each second in verbose mode while dumping to file
|
|
*/
|
|
#ifdef USE_WIN32_MM_TIMER
|
|
void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
|
|
DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
|
|
{
|
|
struct pcap_stat stat;
|
|
|
|
if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
|
|
fprintf(stderr, "Got %u\r", packets_captured);
|
|
}
|
|
#elif defined(HAVE_ALARM)
|
|
static void verbose_stats_dump(int sig _U_)
|
|
{
|
|
struct pcap_stat stat;
|
|
|
|
if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
|
|
fprintf(stderr, "Got %u\r", packets_captured);
|
|
alarm(1);
|
|
}
|
|
#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
|
|
#ifdef WIN32
|
|
(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
|
|
#else /* WIN32 */
|
|
(void)fprintf(stderr, "%s version %s\n", program_name, version);
|
|
#endif /* WIN32 */
|
|
(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 ] [ -M secret ]\n");
|
|
(void)fprintf(stderr,
|
|
"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
|
|
(void)fprintf(stderr,
|
|
"\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
|
|
(void)fprintf(stderr,
|
|
"\t\t[ expression ]\n");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
|
|
/* VARARGS */
|
|
static void
|
|
ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)fprintf(stderr, "%s: ", program_name);
|
|
va_start(ap, fmt);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
if (*fmt) {
|
|
fmt += strlen(fmt);
|
|
if (fmt[-1] != '\n')
|
|
(void)fputc('\n', stderr);
|
|
}
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* VARARGS */
|
|
static void
|
|
ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)fprintf(stderr, "%s: WARNING: ", program_name);
|
|
va_start(ap, fmt);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
if (*fmt) {
|
|
fmt += strlen(fmt);
|
|
if (fmt[-1] != '\n')
|
|
(void)fputc('\n', stderr);
|
|
}
|
|
}
|
|
|