3294 lines
86 KiB
C
3294 lines
86 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: tcpdump.c,v 1.19 2023/08/17 20:19:40 christos Exp $");
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#endif
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/*
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* tcpdump - dump traffic on a network
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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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/*
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* Some older versions of Mac OS X may ship pcap.h from libpcap 0.6 with a
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* libpcap based on 0.8. That means it has pcap_findalldevs() but the
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* header doesn't define pcap_if_t, meaning that we can't actually *use*
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* pcap_findalldevs().
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*/
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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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#include "netdissect-stdinc.h"
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/*
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* This must appear after including netdissect-stdinc.h, so that _U_ is
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* defined.
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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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#endif
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#include <sys/stat.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_LIBCRYPTO
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#include <openssl/crypto.h>
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#endif
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#ifdef HAVE_GETOPT_LONG
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#include <getopt.h>
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#else
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#include "missing/getopt_long.h"
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#endif
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/* Capsicum-specific code requires macros from <net/bpf.h>, which will fail
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* to compile if <pcap.h> has already been included; including the headers
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* in the opposite order works fine. For the most part anyway, because in
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* FreeBSD <pcap/pcap.h> declares bpf_dump() instead of <net/bpf.h>. Thus
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* interface.h takes care of it later to avoid a compiler warning.
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*/
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#ifdef HAVE_CAPSICUM
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#include <sys/capsicum.h>
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#include <sys/ioccom.h>
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#include <net/bpf.h>
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#include <libgen.h>
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#ifdef HAVE_CASPER
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#include <libcasper.h>
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#include <casper/cap_dns.h>
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#include <sys/nv.h>
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#endif /* HAVE_CASPER */
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#endif /* HAVE_CAPSICUM */
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#ifdef HAVE_PCAP_OPEN
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/*
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* We found pcap_open() in the capture library, so we'll be using
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* the remote capture APIs; define PCAP_REMOTE before we include pcap.h,
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* so we get those APIs declared, and the types and #defines that they
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* use defined.
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*
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* WinPcap's headers require that PCAP_REMOTE be defined in order to get
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* remote-capture APIs declared and types and #defines that they use
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* defined.
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*
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* (Versions of libpcap with those APIs, and thus Npcap, which is based on
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* those versions of libpcap, don't require it.)
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*/
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#define HAVE_REMOTE
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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 <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <resolv.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/resource.h>
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#include <pwd.h>
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#include <grp.h>
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#endif /* _WIN32 */
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/*
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* Pathname separator.
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* Use this in pathnames, but do *not* use it in URLs.
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*/
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#ifdef _WIN32
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#define PATH_SEPARATOR '\\'
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#else
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#define PATH_SEPARATOR '/'
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#endif
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/* capabilities convenience library */
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/* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H.
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* If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG.
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* Thus, the later tests are done only on HAVE_LIBCAP_NG.
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*/
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#ifdef HAVE_LIBCAP_NG
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#ifdef HAVE_CAP_NG_H
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#include <cap-ng.h>
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#else
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#undef HAVE_LIBCAP_NG
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#endif /* HAVE_CAP_NG_H */
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#endif /* HAVE_LIBCAP_NG */
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#ifdef __FreeBSD__
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#include <sys/sysctl.h>
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#endif /* __FreeBSD__ */
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#include "netdissect-stdinc.h"
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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 "pcap-missing.h"
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#include "ascii_strcasecmp.h"
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#include "print.h"
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#include "diag-control.h"
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#include "fptype.h"
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#ifndef PATH_MAX
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#define PATH_MAX 1024
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#endif
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#if defined(SIGINFO)
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#define SIGNAL_REQ_INFO SIGINFO
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#elif defined(SIGUSR1)
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#define SIGNAL_REQ_INFO SIGUSR1
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#endif
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#if defined(HAVE_PCAP_DUMP_FLUSH) && defined(SIGUSR2)
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#define SIGNAL_FLUSH_PCAP SIGUSR2
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#endif
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#if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
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static int Bflag; /* buffer size */
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#endif
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#ifdef HAVE_PCAP_DUMP_FTELL64
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static int64_t Cflag; /* rotate dump files after this many bytes */
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#else
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static long Cflag; /* rotate dump files after this many bytes */
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#endif
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static int Cflag_count; /* Keep track of which file number we're writing */
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#ifdef HAVE_PCAP_FINDALLDEVS
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static int Dflag; /* list available devices and exit */
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#endif
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#ifdef HAVE_PCAP_FINDALLDEVS_EX
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static char *remote_interfaces_source; /* list available devices from this source and exit */
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#endif
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/*
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* This is exported because, in some versions of libpcap, if libpcap
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* is built with optimizer debugging code (which is *NOT* the default
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* configuration!), the library *imports*(!) a variable named dflag,
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* under the expectation that tcpdump is exporting it, to govern
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* how much debugging information to print when optimizing
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* the generated BPF code.
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*
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* This is a horrible hack; newer versions of libpcap don't import
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* dflag but, instead, *if* built with optimizer debugging code,
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* *export* a routine to set that flag.
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*/
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extern int dflag;
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int dflag; /* print filter code */
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static int Gflag; /* rotate dump files after this many seconds */
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static int Gflag_count; /* number of files created with Gflag rotation */
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static time_t Gflag_time; /* The last time_t the dump file was rotated. */
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static int Lflag; /* list available data link types and exit */
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static int Iflag; /* rfmon (monitor) mode */
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#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
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static int Jflag; /* list available time stamp types */
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static int jflag = -1; /* packet time stamp source */
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#endif
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static int lflag; /* line-buffered output */
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static int pflag; /* don't go promiscuous */
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#ifdef HAVE_PCAP_SETDIRECTION
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static int Qflag = -1; /* restrict captured packet by send/receive direction */
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#endif
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#ifdef HAVE_PCAP_DUMP_FLUSH
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static int Uflag; /* "unbuffered" output of dump files */
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#endif
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static int Wflag; /* recycle output files after this number of files */
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static int WflagChars;
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static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
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static int timeout = 1000; /* default timeout = 1000 ms = 1 s */
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#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
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static int immediate_mode;
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#endif
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static int count_mode;
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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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/* Forwards */
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static NORETURN void error(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
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static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
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static NORETURN void exit_tcpdump(int);
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static void (*setsignal (int sig, void (*func)(int)))(int);
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static void cleanup(int);
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static void child_cleanup(int);
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static void print_version(FILE *);
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static void print_usage(FILE *);
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#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
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static NORETURN void show_tstamp_types_and_exit(pcap_t *, const char *device);
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#endif
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static NORETURN void show_dlts_and_exit(pcap_t *, const char *device);
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#ifdef HAVE_PCAP_FINDALLDEVS
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static NORETURN void show_devices_and_exit(void);
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#endif
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#ifdef HAVE_PCAP_FINDALLDEVS_EX
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static NORETURN void show_remote_devices_and_exit(void);
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#endif
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static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
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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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#ifdef SIGNAL_REQ_INFO
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static void requestinfo(int);
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#endif
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#ifdef SIGNAL_FLUSH_PCAP
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static void flushpcap(int);
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#endif
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#ifdef _WIN32
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static HANDLE timer_handle = INVALID_HANDLE_VALUE;
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static void CALLBACK verbose_stats_dump(PVOID param, BOOLEAN timer_fired);
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#else /* _WIN32 */
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static void verbose_stats_dump(int sig);
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#endif /* _WIN32 */
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static void info(int);
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static u_int packets_captured;
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#ifdef HAVE_PCAP_FINDALLDEVS
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static const struct tok status_flags[] = {
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#ifdef PCAP_IF_UP
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{ PCAP_IF_UP, "Up" },
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#endif
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#ifdef PCAP_IF_RUNNING
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{ PCAP_IF_RUNNING, "Running" },
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#endif
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{ PCAP_IF_LOOPBACK, "Loopback" },
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#ifdef PCAP_IF_WIRELESS
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{ PCAP_IF_WIRELESS, "Wireless" },
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#endif
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{ 0, NULL }
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};
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#endif
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static pcap_t *pd;
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static pcap_dumper_t *pdd = NULL;
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static int supports_monitor_mode;
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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 dump_info {
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char *WFileName;
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char *CurrentFileName;
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pcap_t *pd;
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pcap_dumper_t *pdd;
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netdissect_options *ndo;
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#ifdef HAVE_CAPSICUM
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int dirfd;
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#endif
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};
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#if defined(HAVE_PCAP_SET_PARSER_DEBUG)
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/*
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* We have pcap_set_parser_debug() in libpcap; declare it (it's not declared
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* by any libpcap header, because it's a special hack, only available if
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* libpcap was configured to include it, and only intended for use by
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* libpcap developers trying to debug the parser for filter expressions).
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*/
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#ifdef _WIN32
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__declspec(dllimport)
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#else /* _WIN32 */
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extern
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#endif /* _WIN32 */
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void pcap_set_parser_debug(int);
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#elif defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
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/*
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* We don't have pcap_set_parser_debug() in libpcap, but we do have
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* pcap_debug or yydebug. Make a local version of pcap_set_parser_debug()
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* to set the flag, and define HAVE_PCAP_SET_PARSER_DEBUG.
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*/
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static void
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pcap_set_parser_debug(int value)
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{
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#ifdef HAVE_PCAP_DEBUG
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extern int pcap_debug __weak;
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if (&pcap_debug)
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pcap_debug = value;
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#else /* HAVE_PCAP_DEBUG */
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extern int yydebug;
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yydebug = value;
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#endif /* HAVE_PCAP_DEBUG */
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}
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#define HAVE_PCAP_SET_PARSER_DEBUG
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#endif
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#if defined(HAVE_PCAP_SET_OPTIMIZER_DEBUG)
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/*
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* We have pcap_set_optimizer_debug() in libpcap; declare it (it's not declared
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* by any libpcap header, because it's a special hack, only available if
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* libpcap was configured to include it, and only intended for use by
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* libpcap developers trying to debug the optimizer for filter expressions).
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*/
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#ifdef _WIN32
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__declspec(dllimport)
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#else /* _WIN32 */
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extern
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#endif /* _WIN32 */
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void pcap_set_optimizer_debug(int);
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#endif
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/* VARARGS */
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static void
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error(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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exit_tcpdump(S_ERR_HOST_PROGRAM);
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/* NOTREACHED */
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}
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|
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/* VARARGS */
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static void
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warning(const char *fmt, ...)
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{
|
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va_list ap;
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|
|
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(void)fprintf(stderr, "%s: WARNING: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
|
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if (*fmt) {
|
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fmt += strlen(fmt);
|
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if (fmt[-1] != '\n')
|
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(void)fputc('\n', stderr);
|
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}
|
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}
|
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|
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static void
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exit_tcpdump(int status)
|
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{
|
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nd_cleanup();
|
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exit(status);
|
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}
|
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|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
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static void
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show_tstamp_types_and_exit(pcap_t *pc, const char *device)
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{
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int n_tstamp_types;
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int *tstamp_types = 0;
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const char *tstamp_type_name;
|
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int i;
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n_tstamp_types = pcap_list_tstamp_types(pc, &tstamp_types);
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if (n_tstamp_types < 0)
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error("%s", pcap_geterr(pc));
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if (n_tstamp_types == 0) {
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fprintf(stderr, "Time stamp type cannot be set for %s\n",
|
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device);
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exit_tcpdump(S_SUCCESS);
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}
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fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
|
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device);
|
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for (i = 0; i < n_tstamp_types; i++) {
|
|
tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
|
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if (tstamp_type_name != NULL) {
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(void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
|
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pcap_tstamp_type_val_to_description(tstamp_types[i]));
|
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} else {
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|
(void) fprintf(stderr, " %d\n", tstamp_types[i]);
|
|
}
|
|
}
|
|
pcap_free_tstamp_types(tstamp_types);
|
|
exit_tcpdump(S_SUCCESS);
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|
}
|
|
#endif
|
|
|
|
static void
|
|
show_dlts_and_exit(pcap_t *pc, const char *device)
|
|
{
|
|
int n_dlts, i;
|
|
int *dlts = 0;
|
|
const char *dlt_name;
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|
n_dlts = pcap_list_datalinks(pc, &dlts);
|
|
if (n_dlts < 0)
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error("%s", pcap_geterr(pc));
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else if (n_dlts == 0 || !dlts)
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error("No data link types.");
|
|
|
|
/*
|
|
* If the interface is known to support monitor mode, indicate
|
|
* whether these are the data link types available when not in
|
|
* monitor mode, if -I wasn't specified, or when in monitor mode,
|
|
* when -I was specified (the link-layer types available in
|
|
* monitor mode might be different from the ones available when
|
|
* not in monitor mode).
|
|
*/
|
|
if (supports_monitor_mode)
|
|
(void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
|
|
device,
|
|
Iflag ? "when in monitor mode" : "when not in monitor mode");
|
|
else
|
|
(void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
|
|
device);
|
|
|
|
for (i = 0; i < n_dlts; i++) {
|
|
dlt_name = pcap_datalink_val_to_name(dlts[i]);
|
|
if (dlt_name != NULL) {
|
|
(void) fprintf(stderr, " %s (%s)", dlt_name,
|
|
pcap_datalink_val_to_description(dlts[i]));
|
|
|
|
/*
|
|
* OK, does tcpdump handle that type?
|
|
*/
|
|
if (!has_printer(dlts[i]))
|
|
(void) fprintf(stderr, " (printing not supported)");
|
|
fprintf(stderr, "\n");
|
|
} else {
|
|
(void) fprintf(stderr, " DLT %d (printing not supported)\n",
|
|
dlts[i]);
|
|
}
|
|
}
|
|
#ifdef HAVE_PCAP_FREE_DATALINKS
|
|
pcap_free_datalinks(dlts);
|
|
#endif
|
|
exit_tcpdump(S_SUCCESS);
|
|
}
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
static void
|
|
show_devices_and_exit(void)
|
|
{
|
|
pcap_if_t *dev, *devlist;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
int i;
|
|
|
|
if (pcap_findalldevs(&devlist, ebuf) < 0)
|
|
error("%s", ebuf);
|
|
for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
|
|
printf("%d.%s", i+1, dev->name);
|
|
if (dev->description != NULL)
|
|
printf(" (%s)", dev->description);
|
|
if (dev->flags != 0) {
|
|
printf(" [");
|
|
printf("%s", bittok2str(status_flags, "none", dev->flags));
|
|
#ifdef PCAP_IF_WIRELESS
|
|
if (dev->flags & PCAP_IF_WIRELESS) {
|
|
switch (dev->flags & PCAP_IF_CONNECTION_STATUS) {
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
|
|
printf(", Association status unknown");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_CONNECTED:
|
|
printf(", Associated");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
|
|
printf(", Not associated");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
|
|
break;
|
|
}
|
|
} else {
|
|
switch (dev->flags & PCAP_IF_CONNECTION_STATUS) {
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
|
|
printf(", Connection status unknown");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_CONNECTED:
|
|
printf(", Connected");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
|
|
printf(", Disconnected");
|
|
break;
|
|
|
|
case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
printf("]");
|
|
}
|
|
printf("\n");
|
|
}
|
|
pcap_freealldevs(devlist);
|
|
exit_tcpdump(S_SUCCESS);
|
|
}
|
|
#endif /* HAVE_PCAP_FINDALLDEVS */
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
static void
|
|
show_remote_devices_and_exit(void)
|
|
{
|
|
pcap_if_t *dev, *devlist;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
int i;
|
|
|
|
if (pcap_findalldevs_ex(remote_interfaces_source, NULL, &devlist,
|
|
ebuf) < 0)
|
|
error("%s", ebuf);
|
|
for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
|
|
printf("%d.%s", i+1, dev->name);
|
|
if (dev->description != NULL)
|
|
printf(" (%s)", dev->description);
|
|
if (dev->flags != 0)
|
|
printf(" [%s]", bittok2str(status_flags, "none", dev->flags));
|
|
printf("\n");
|
|
}
|
|
pcap_freealldevs(devlist);
|
|
exit_tcpdump(S_SUCCESS);
|
|
}
|
|
#endif /* HAVE_PCAP_FINDALLDEVS */
|
|
|
|
/*
|
|
* Short options.
|
|
*
|
|
* Note that there we use all letters for short options except for g, k,
|
|
* o, and P, and those are used by other versions of tcpdump, and we should
|
|
* only use them for the same purposes that the other versions of tcpdump
|
|
* use them:
|
|
*
|
|
* macOS tcpdump uses -g to force non--v output for IP to be on one
|
|
* line, making it more "g"repable;
|
|
*
|
|
* macOS tcpdump uses -k to specify that packet comments in pcapng files
|
|
* should be printed;
|
|
*
|
|
* OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done
|
|
* for hosts sending TCP SYN packets;
|
|
*
|
|
* macOS tcpdump uses -P to indicate that -w should write pcapng rather
|
|
* than pcap files.
|
|
*
|
|
* macOS tcpdump also uses -Q to specify expressions that match packet
|
|
* metadata, including but not limited to the packet direction.
|
|
* The expression syntax is different from a simple "in|out|inout",
|
|
* and those expressions aren't accepted by macOS tcpdump, but the
|
|
* equivalents would be "in" = "dir=in", "out" = "dir=out", and
|
|
* "inout" = "dir=in or dir=out", and the parser could conceivably
|
|
* special-case "in", "out", and "inout" as expressions for backwards
|
|
* compatibility, so all is not (yet) lost.
|
|
*/
|
|
|
|
/*
|
|
* Set up flags that might or might not be supported depending on the
|
|
* version of libpcap we're using.
|
|
*/
|
|
#if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
|
|
#define B_FLAG "B:"
|
|
#define B_FLAG_USAGE " [ -B size ]"
|
|
#else /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
|
|
#define B_FLAG
|
|
#define B_FLAG_USAGE
|
|
#endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
#define D_FLAG "D"
|
|
#else
|
|
#define D_FLAG
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_CREATE
|
|
#define I_FLAG "I"
|
|
#else /* HAVE_PCAP_CREATE */
|
|
#define I_FLAG
|
|
#endif /* HAVE_PCAP_CREATE */
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
|
#define j_FLAG "j:"
|
|
#define j_FLAG_USAGE " [ -j tstamptype ]"
|
|
#define J_FLAG "J"
|
|
#else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
|
|
#define j_FLAG
|
|
#define j_FLAG_USAGE
|
|
#define J_FLAG
|
|
#endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
|
|
|
|
#ifdef USE_LIBSMI
|
|
#define m_FLAG_USAGE "[ -m module ] ..."
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_SETDIRECTION
|
|
#define Q_FLAG "Q:"
|
|
#define Q_FLAG_USAGE " [ -Q in|out|inout ]"
|
|
#else
|
|
#define Q_FLAG
|
|
#define Q_FLAG_USAGE
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
#define U_FLAG "U"
|
|
#else
|
|
#define U_FLAG
|
|
#endif
|
|
|
|
#define SHORTOPTS "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpq" Q_FLAG "r:s:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:#"
|
|
|
|
/*
|
|
* Long options.
|
|
*
|
|
* We do not currently have long options corresponding to all short
|
|
* options; we should probably pick appropriate option names for them.
|
|
*
|
|
* However, the short options where the number of times the option is
|
|
* specified matters, such as -v and -d and -t, should probably not
|
|
* just map to a long option, as saying
|
|
*
|
|
* tcpdump --verbose --verbose
|
|
*
|
|
* doesn't make sense; it should be --verbosity={N} or something such
|
|
* as that.
|
|
*
|
|
* For long options with no corresponding short options, we define values
|
|
* outside the range of ASCII graphic characters, make that the last
|
|
* component of the entry for the long option, and have a case for that
|
|
* option in the switch statement.
|
|
*/
|
|
#define OPTION_VERSION 128
|
|
#define OPTION_TSTAMP_PRECISION 129
|
|
#define OPTION_IMMEDIATE_MODE 130
|
|
#define OPTION_PRINT 131
|
|
#define OPTION_LIST_REMOTE_INTERFACES 132
|
|
#define OPTION_TSTAMP_MICRO 133
|
|
#define OPTION_TSTAMP_NANO 134
|
|
#define OPTION_FP_TYPE 135
|
|
#define OPTION_COUNT 136
|
|
|
|
static const struct option longopts[] = {
|
|
#if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
|
|
{ "buffer-size", required_argument, NULL, 'B' },
|
|
#endif
|
|
{ "list-interfaces", no_argument, NULL, 'D' },
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
{ "list-remote-interfaces", required_argument, NULL, OPTION_LIST_REMOTE_INTERFACES },
|
|
#endif
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "interface", required_argument, NULL, 'i' },
|
|
#ifdef HAVE_PCAP_CREATE
|
|
{ "monitor-mode", no_argument, NULL, 'I' },
|
|
#endif
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
|
{ "time-stamp-type", required_argument, NULL, 'j' },
|
|
{ "list-time-stamp-types", no_argument, NULL, 'J' },
|
|
#endif
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
{ "micro", no_argument, NULL, OPTION_TSTAMP_MICRO},
|
|
{ "nano", no_argument, NULL, OPTION_TSTAMP_NANO},
|
|
{ "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION},
|
|
#endif
|
|
{ "dont-verify-checksums", no_argument, NULL, 'K' },
|
|
{ "list-data-link-types", no_argument, NULL, 'L' },
|
|
{ "no-optimize", no_argument, NULL, 'O' },
|
|
{ "no-promiscuous-mode", no_argument, NULL, 'p' },
|
|
#ifdef HAVE_PCAP_SETDIRECTION
|
|
{ "direction", required_argument, NULL, 'Q' },
|
|
#endif
|
|
{ "snapshot-length", required_argument, NULL, 's' },
|
|
{ "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' },
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
{ "packet-buffered", no_argument, NULL, 'U' },
|
|
#endif
|
|
{ "linktype", required_argument, NULL, 'y' },
|
|
#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
|
|
{ "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE },
|
|
#endif
|
|
#ifdef HAVE_PCAP_SET_PARSER_DEBUG
|
|
{ "debug-filter-parser", no_argument, NULL, 'Y' },
|
|
#endif
|
|
{ "relinquish-privileges", required_argument, NULL, 'Z' },
|
|
{ "count", no_argument, NULL, OPTION_COUNT },
|
|
{ "fp-type", no_argument, NULL, OPTION_FP_TYPE },
|
|
{ "number", no_argument, NULL, '#' },
|
|
{ "print", no_argument, NULL, OPTION_PRINT },
|
|
{ "version", no_argument, NULL, OPTION_VERSION },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
#define LIST_REMOTE_INTERFACES_USAGE "[ --list-remote-interfaces remote-source ]"
|
|
#else
|
|
#define LIST_REMOTE_INTERFACES_USAGE
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
|
|
#define IMMEDIATE_MODE_USAGE " [ --immediate-mode ]"
|
|
#else
|
|
#define IMMEDIATE_MODE_USAGE ""
|
|
#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)
|
|
error("Chroot without dropping root is insecure");
|
|
|
|
pw = getpwnam(username);
|
|
if (pw) {
|
|
if (initgroups(pw->pw_name, pw->pw_gid) != 0) {
|
|
fprintf(stderr, "tcpdump: Couldn't initgroups to "
|
|
"'%.32s' gid=%lu: %s\n", pw->pw_name,
|
|
(unsigned long)pw->pw_gid,
|
|
pcap_strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (chroot_dir) {
|
|
setprotoent(1);
|
|
res_init();
|
|
if (chroot(chroot_dir) != 0 || chdir ("/") != 0)
|
|
error("Couldn't chroot/chdir to '%.64s': %s",
|
|
chroot_dir, pcap_strerror(errno));
|
|
}
|
|
#ifdef HAVE_LIBCAP_NG
|
|
{
|
|
int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
|
|
if (ret < 0)
|
|
error("capng_change_id(): return %d\n", ret);
|
|
else
|
|
fprintf(stderr, "dropped privs to %s\n", username);
|
|
}
|
|
#else
|
|
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
|
|
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0)
|
|
error("Couldn't change to '%.32s' uid=%lu gid=%lu: %s",
|
|
username,
|
|
(unsigned long)pw->pw_uid,
|
|
(unsigned long)pw->pw_gid,
|
|
pcap_strerror(errno));
|
|
else {
|
|
// fprintf(stderr, "dropped privs to %s\n", username);
|
|
}
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
} else
|
|
error("Couldn't find user '%.32s'", username);
|
|
#ifdef HAVE_LIBCAP_NG
|
|
/* We don't need CAP_SETUID, CAP_SETGID and CAP_SYS_CHROOT any more. */
|
|
DIAG_OFF_ASSIGN_ENUM
|
|
capng_updatev(
|
|
CAPNG_DROP,
|
|
CAPNG_EFFECTIVE | CAPNG_PERMITTED,
|
|
CAP_SETUID,
|
|
CAP_SETGID,
|
|
CAP_SYS_CHROOT,
|
|
-1);
|
|
DIAG_ON_ASSIGN_ENUM
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
|
|
}
|
|
#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)
|
|
{
|
|
char *filename = malloc(PATH_MAX + 1);
|
|
if (filename == NULL)
|
|
error("%s: malloc", __func__);
|
|
if (strlen(orig_name) == 0)
|
|
error("an empty string is not a valid file name");
|
|
|
|
/* Process with strftime if Gflag is set. */
|
|
if (Gflag != 0) {
|
|
struct tm *local_tm;
|
|
|
|
/* Convert Gflag_time to a usable format */
|
|
if ((local_tm = localtime(&Gflag_time)) == NULL) {
|
|
error("%s: localtime", __func__);
|
|
}
|
|
|
|
/* There's no good way to detect an error in strftime since a return
|
|
* value of 0 isn't necessarily failure; if orig_name is an empty
|
|
* string, the formatted string will be empty.
|
|
*
|
|
* However, the C90 standard says that, if there *is* a
|
|
* buffer overflow, the content of the buffer is undefined,
|
|
* so we must check for a buffer overflow.
|
|
*
|
|
* So we check above for an empty orig_name, and only call
|
|
* strftime() if it's non-empty, in which case the return
|
|
* value will only be 0 if the formatted date doesn't fit
|
|
* in the buffer.
|
|
*
|
|
* (We check above because, even if we don't use -G, we
|
|
* want a better error message than "tcpdump: : No such
|
|
* file or directory" for this case.)
|
|
*/
|
|
if (strftime(filename, PATH_MAX, orig_name, local_tm) == 0) {
|
|
error("%s: strftime", __func__);
|
|
}
|
|
} else {
|
|
strncpy(filename, orig_name, PATH_MAX);
|
|
}
|
|
|
|
if (cnt == 0 && max_chars == 0)
|
|
strncpy(buffer, filename, PATH_MAX + 1);
|
|
else
|
|
if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
|
|
/* Report an error if the filename is too large */
|
|
error("too many output files or filename is too long (> %d)", PATH_MAX);
|
|
free(filename);
|
|
}
|
|
|
|
static char *
|
|
get_next_file(FILE *VFile, char *ptr)
|
|
{
|
|
char *ret;
|
|
size_t len;
|
|
|
|
ret = fgets(ptr, PATH_MAX, VFile);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
len = strlen (ptr);
|
|
if (len > 0 && ptr[len - 1] == '\n')
|
|
ptr[len - 1] = '\0';
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef HAVE_CASPER
|
|
static cap_channel_t *
|
|
capdns_setup(void)
|
|
{
|
|
cap_channel_t *capcas, *capdnsloc;
|
|
const char *types[1];
|
|
int families[2];
|
|
|
|
capcas = cap_init();
|
|
if (capcas == NULL)
|
|
error("unable to create casper process");
|
|
capdnsloc = cap_service_open(capcas, "system.dns");
|
|
/* Casper capability no longer needed. */
|
|
cap_close(capcas);
|
|
if (capdnsloc == NULL)
|
|
error("unable to open system.dns service");
|
|
/* Limit system.dns to reverse DNS lookups. */
|
|
types[0] = "ADDR";
|
|
if (cap_dns_type_limit(capdnsloc, types, 1) < 0)
|
|
error("unable to limit access to system.dns service");
|
|
families[0] = AF_INET;
|
|
families[1] = AF_INET6;
|
|
if (cap_dns_family_limit(capdnsloc, families, 2) < 0)
|
|
error("unable to limit access to system.dns service");
|
|
|
|
return (capdnsloc);
|
|
}
|
|
#endif /* HAVE_CASPER */
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
static int
|
|
tstamp_precision_from_string(const char *precision)
|
|
{
|
|
if (strncmp(precision, "nano", strlen("nano")) == 0)
|
|
return PCAP_TSTAMP_PRECISION_NANO;
|
|
|
|
if (strncmp(precision, "micro", strlen("micro")) == 0)
|
|
return PCAP_TSTAMP_PRECISION_MICRO;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const char *
|
|
tstamp_precision_to_string(int precision)
|
|
{
|
|
switch (precision) {
|
|
|
|
case PCAP_TSTAMP_PRECISION_MICRO:
|
|
return "micro";
|
|
|
|
case PCAP_TSTAMP_PRECISION_NANO:
|
|
return "nano";
|
|
|
|
default:
|
|
return "unknown";
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_CAPSICUM
|
|
/*
|
|
* Ensure that, on a dump file's descriptor, we have all the rights
|
|
* necessary to make the standard I/O library work with an fdopen()ed
|
|
* FILE * from that descriptor.
|
|
*
|
|
* A long time ago in a galaxy far, far away, AT&T decided that, instead
|
|
* of providing separate APIs for getting and setting the FD_ flags on a
|
|
* descriptor, getting and setting the O_ flags on a descriptor, and
|
|
* locking files, they'd throw them all into a kitchen-sink fcntl() call
|
|
* along the lines of ioctl(), the fact that ioctl() operations are
|
|
* largely specific to particular character devices but fcntl() operations
|
|
* are either generic to all descriptors or generic to all descriptors for
|
|
* regular files nonwithstanding.
|
|
*
|
|
* The Capsicum people decided that fine-grained control of descriptor
|
|
* operations was required, so that you need to grant permission for
|
|
* reading, writing, seeking, and fcntl-ing. The latter, courtesy of
|
|
* AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
|
|
* collection of things, so there are *individual* fcntls for which
|
|
* permission needs to be granted.
|
|
*
|
|
* The FreeBSD standard I/O people implemented some optimizations that
|
|
* requires that the standard I/O routines be able to determine whether
|
|
* the descriptor for the FILE * is open append-only or not; as that
|
|
* descriptor could have come from an open() rather than an fopen(),
|
|
* that requires that it be able to do an F_GETFL fcntl() to read
|
|
* the O_ flags.
|
|
*
|
|
* Tcpdump uses ftell() to determine how much data has been written
|
|
* to a file in order to, when used with -C, determine when it's time
|
|
* to rotate capture files. ftell() therefore needs to do an lseek()
|
|
* to find out the file offset and must, thanks to the aforementioned
|
|
* optimization, also know whether the descriptor is open append-only
|
|
* or not.
|
|
*
|
|
* The net result of all the above is that we need to grant CAP_SEEK,
|
|
* CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
|
|
*
|
|
* Perhaps this is the universe's way of saying that either
|
|
*
|
|
* 1) there needs to be an fopenat() call and a pcap_dump_openat() call
|
|
* using it, so that Capsicum-capable tcpdump wouldn't need to do
|
|
* an fdopen()
|
|
*
|
|
* or
|
|
*
|
|
* 2) there needs to be a cap_fdopen() call in the FreeBSD standard
|
|
* I/O library that knows what rights are needed by the standard
|
|
* I/O library, based on the open mode, and assigns them, perhaps
|
|
* with an additional argument indicating, for example, whether
|
|
* seeking should be allowed, so that tcpdump doesn't need to know
|
|
* what the standard I/O library happens to require this week.
|
|
*/
|
|
static void
|
|
set_dumper_capsicum_rights(pcap_dumper_t *p)
|
|
{
|
|
int fd = fileno(pcap_dump_file(p));
|
|
cap_rights_t rights;
|
|
|
|
cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
|
|
if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
|
|
error("unable to limit dump descriptor");
|
|
}
|
|
if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
|
|
error("unable to limit dump descriptor fcntls");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Copy arg vector into a new buffer, concatenating arguments with spaces.
|
|
*/
|
|
static char *
|
|
copy_argv(char **argv)
|
|
{
|
|
char **p;
|
|
size_t len = 0;
|
|
char *buf;
|
|
char *src, *dst;
|
|
|
|
p = argv;
|
|
if (*p == NULL)
|
|
return 0;
|
|
|
|
while (*p)
|
|
len += strlen(*p++) + 1;
|
|
|
|
buf = (char *)malloc(len);
|
|
if (buf == NULL)
|
|
error("%s: malloc", __func__);
|
|
|
|
p = argv;
|
|
dst = buf;
|
|
while ((src = *p++) != NULL) {
|
|
while ((*dst++ = *src++) != '\0')
|
|
;
|
|
dst[-1] = ' ';
|
|
}
|
|
dst[-1] = '\0';
|
|
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* On Windows, we need to open the file in binary mode, so that
|
|
* we get all the bytes specified by the size we get from "fstat()".
|
|
* On UNIX, that's not necessary. O_BINARY is defined on Windows;
|
|
* we define it as 0 if it's not defined, so it does nothing.
|
|
*/
|
|
#ifndef O_BINARY
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
static char *
|
|
read_infile(char *fname)
|
|
{
|
|
int i, fd;
|
|
ssize_t cc;
|
|
char *cp;
|
|
our_statb buf;
|
|
|
|
fd = open(fname, O_RDONLY|O_BINARY);
|
|
if (fd < 0)
|
|
error("can't open %s: %s", fname, pcap_strerror(errno));
|
|
|
|
if (our_fstat(fd, &buf) < 0)
|
|
error("can't stat %s: %s", fname, pcap_strerror(errno));
|
|
|
|
/*
|
|
* Reject files whose size doesn't fit into an int; a filter
|
|
* *that* large will probably be too big.
|
|
*/
|
|
if (buf.st_size > INT_MAX)
|
|
error("%s is too large", fname);
|
|
|
|
cp = malloc((u_int)buf.st_size + 1);
|
|
if (cp == NULL)
|
|
error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
|
|
fname, pcap_strerror(errno));
|
|
cc = read(fd, cp, (u_int)buf.st_size);
|
|
if (cc < 0)
|
|
error("read %s: %s", fname, pcap_strerror(errno));
|
|
if (cc != buf.st_size)
|
|
error("short read %s (%d != %d)", fname, (int) cc,
|
|
(int)buf.st_size);
|
|
|
|
close(fd);
|
|
/* replace "# comment" with spaces */
|
|
for (i = 0; i < cc; i++) {
|
|
if (cp[i] == '#')
|
|
while (i < cc && cp[i] != '\n')
|
|
cp[i++] = ' ';
|
|
}
|
|
cp[cc] = '\0';
|
|
return (cp);
|
|
}
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
static long
|
|
parse_interface_number(const char *device)
|
|
{
|
|
const char *p;
|
|
long devnum;
|
|
char *end;
|
|
|
|
/*
|
|
* Search for a colon, terminating any scheme at the beginning
|
|
* of the device.
|
|
*/
|
|
p = strchr(device, ':');
|
|
if (p != NULL) {
|
|
/*
|
|
* We found it. Is it followed by "//"?
|
|
*/
|
|
p++; /* skip the : */
|
|
if (strncmp(p, "//", 2) == 0) {
|
|
/*
|
|
* Yes. Search for the next /, at the end of the
|
|
* authority part of the URL.
|
|
*/
|
|
p += 2; /* skip the // */
|
|
p = strchr(p, '/');
|
|
if (p != NULL) {
|
|
/*
|
|
* OK, past the / is the path.
|
|
*/
|
|
device = p + 1;
|
|
}
|
|
}
|
|
}
|
|
devnum = strtol(device, &end, 10);
|
|
if (device != end && *end == '\0') {
|
|
/*
|
|
* It's all-numeric, but is it a valid number?
|
|
*/
|
|
if (devnum <= 0) {
|
|
/*
|
|
* No, it's not an ordinal.
|
|
*/
|
|
error("Invalid adapter index");
|
|
}
|
|
return (devnum);
|
|
} else {
|
|
/*
|
|
* It's not all-numeric; return -1, so our caller
|
|
* knows that.
|
|
*/
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
static char *
|
|
find_interface_by_number(const char *url
|
|
#ifndef HAVE_PCAP_FINDALLDEVS_EX
|
|
_U_
|
|
#endif
|
|
, long devnum)
|
|
{
|
|
pcap_if_t *dev, *devlist;
|
|
long i;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
char *device;
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
const char *endp;
|
|
char *host_url;
|
|
#endif
|
|
int status;
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
/*
|
|
* Search for a colon, terminating any scheme at the beginning
|
|
* of the URL.
|
|
*/
|
|
endp = strchr(url, ':');
|
|
if (endp != NULL) {
|
|
/*
|
|
* We found it. Is it followed by "//"?
|
|
*/
|
|
endp++; /* skip the : */
|
|
if (strncmp(endp, "//", 2) == 0) {
|
|
/*
|
|
* Yes. Search for the next /, at the end of the
|
|
* authority part of the URL.
|
|
*/
|
|
endp += 2; /* skip the // */
|
|
endp = strchr(endp, '/');
|
|
} else
|
|
endp = NULL;
|
|
}
|
|
if (endp != NULL) {
|
|
/*
|
|
* OK, everything from device to endp is a URL to hand
|
|
* to pcap_findalldevs_ex().
|
|
*/
|
|
endp++; /* Include the trailing / in the URL; pcap_findalldevs_ex() requires it */
|
|
host_url = malloc(endp - url + 1);
|
|
if (host_url == NULL && (endp - url + 1) > 0)
|
|
error("Invalid allocation for host");
|
|
|
|
memcpy(host_url, url, endp - url);
|
|
host_url[endp - url] = '\0';
|
|
status = pcap_findalldevs_ex(host_url, NULL, &devlist, ebuf);
|
|
free(host_url);
|
|
} else
|
|
#endif
|
|
status = pcap_findalldevs(&devlist, ebuf);
|
|
if (status < 0)
|
|
error("%s", ebuf);
|
|
/*
|
|
* Look for the devnum-th entry in the list of devices (1-based).
|
|
*/
|
|
for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
|
|
i++, dev = dev->next)
|
|
;
|
|
if (dev == NULL)
|
|
error("Invalid adapter index");
|
|
device = strdup(dev->name);
|
|
pcap_freealldevs(devlist);
|
|
return (device);
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_OPEN
|
|
/*
|
|
* Prefixes for rpcap URLs.
|
|
*/
|
|
static char rpcap_prefix[] = "rpcap://";
|
|
static char rpcap_ssl_prefix[] = "rpcaps://";
|
|
#endif
|
|
|
|
static pcap_t *
|
|
open_interface(const char *device, netdissect_options *ndo, char *ebuf)
|
|
{
|
|
pcap_t *pc;
|
|
#ifdef HAVE_PCAP_CREATE
|
|
int status;
|
|
char *cp;
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_OPEN
|
|
/*
|
|
* Is this an rpcap URL?
|
|
*/
|
|
if (strncmp(device, rpcap_prefix, sizeof(rpcap_prefix) - 1) == 0 ||
|
|
strncmp(device, rpcap_ssl_prefix, sizeof(rpcap_ssl_prefix) - 1) == 0) {
|
|
/*
|
|
* Yes. Open it with pcap_open().
|
|
*/
|
|
*ebuf = '\0';
|
|
pc = pcap_open(device, ndo->ndo_snaplen,
|
|
pflag ? 0 : PCAP_OPENFLAG_PROMISCUOUS, timeout, NULL,
|
|
ebuf);
|
|
if (pc == NULL) {
|
|
/*
|
|
* If this failed with "No such device" or "The system
|
|
* cannot find the device specified", that means
|
|
* the interface doesn't exist; return NULL, so that
|
|
* the caller can see whether the device name is
|
|
* actually an interface index.
|
|
*/
|
|
if (strstr(ebuf, "No such device") != NULL ||
|
|
strstr(ebuf, "The system cannot find the device specified") != NULL)
|
|
return (NULL);
|
|
error("%s", ebuf);
|
|
}
|
|
if (*ebuf)
|
|
warning("%s", ebuf);
|
|
return (pc);
|
|
}
|
|
#endif /* HAVE_PCAP_OPEN */
|
|
|
|
#ifdef HAVE_PCAP_CREATE
|
|
pc = pcap_create(device, ebuf);
|
|
if (pc == NULL) {
|
|
/*
|
|
* If this failed with "No such device", that means
|
|
* the interface doesn't exist; return NULL, so that
|
|
* the caller can see whether the device name is
|
|
* actually an interface index.
|
|
*/
|
|
if (strstr(ebuf, "No such device") != NULL)
|
|
return (NULL);
|
|
error("%s", ebuf);
|
|
}
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
|
if (Jflag)
|
|
show_tstamp_types_and_exit(pc, device);
|
|
#endif
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision);
|
|
if (status != 0)
|
|
error("%s: Can't set %ssecond time stamp precision: %s",
|
|
device,
|
|
tstamp_precision_to_string(ndo->ndo_tstamp_precision),
|
|
pcap_statustostr(status));
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
|
|
if (immediate_mode) {
|
|
status = pcap_set_immediate_mode(pc, 1);
|
|
if (status != 0)
|
|
error("%s: Can't set immediate mode: %s",
|
|
device, pcap_statustostr(status));
|
|
}
|
|
#endif
|
|
/*
|
|
* Is this an interface that supports monitor mode?
|
|
*/
|
|
if (pcap_can_set_rfmon(pc) == 1)
|
|
supports_monitor_mode = 1;
|
|
else
|
|
supports_monitor_mode = 0;
|
|
if (ndo->ndo_snaplen != 0) {
|
|
/*
|
|
* A snapshot length was explicitly specified;
|
|
* use it.
|
|
*/
|
|
status = pcap_set_snaplen(pc, ndo->ndo_snaplen);
|
|
if (status != 0)
|
|
error("%s: Can't set snapshot length: %s",
|
|
device, pcap_statustostr(status));
|
|
}
|
|
status = pcap_set_promisc(pc, !pflag);
|
|
if (status != 0)
|
|
error("%s: Can't set promiscuous mode: %s",
|
|
device, pcap_statustostr(status));
|
|
if (Iflag) {
|
|
status = pcap_set_rfmon(pc, 1);
|
|
if (status != 0)
|
|
error("%s: Can't set monitor mode: %s",
|
|
device, pcap_statustostr(status));
|
|
}
|
|
status = pcap_set_timeout(pc, timeout);
|
|
if (status != 0)
|
|
error("%s: pcap_set_timeout failed: %s",
|
|
device, pcap_statustostr(status));
|
|
if (Bflag != 0) {
|
|
status = pcap_set_buffer_size(pc, Bflag);
|
|
if (status != 0)
|
|
error("%s: Can't set buffer size: %s",
|
|
device, pcap_statustostr(status));
|
|
}
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
|
if (jflag != -1) {
|
|
status = pcap_set_tstamp_type(pc, jflag);
|
|
if (status < 0)
|
|
error("%s: Can't set time stamp type: %s",
|
|
device, pcap_statustostr(status));
|
|
else if (status > 0)
|
|
warning("When trying to set timestamp type '%s' on %s: %s",
|
|
pcap_tstamp_type_val_to_name(jflag), device,
|
|
pcap_statustostr(status));
|
|
}
|
|
#endif
|
|
status = pcap_activate(pc);
|
|
if (status < 0) {
|
|
/*
|
|
* pcap_activate() failed.
|
|
*/
|
|
cp = pcap_geterr(pc);
|
|
if (status == PCAP_ERROR)
|
|
error("%s", cp);
|
|
else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
|
|
/*
|
|
* Return an error for our caller to handle.
|
|
*/
|
|
snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
|
|
device, pcap_statustostr(status), cp);
|
|
} else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
|
|
error("%s: %s\n(%s)", device,
|
|
pcap_statustostr(status), cp);
|
|
#ifdef __FreeBSD__
|
|
else if (status == PCAP_ERROR_RFMON_NOTSUP &&
|
|
strncmp(device, "wlan", 4) == 0) {
|
|
char parent[8], newdev[8];
|
|
char sysctl[32];
|
|
size_t s = sizeof(parent);
|
|
|
|
snprintf(sysctl, sizeof(sysctl),
|
|
"net.wlan.%d.%%parent", atoi(device + 4));
|
|
sysctlbyname(sysctl, parent, &s, NULL, 0);
|
|
strlcpy(newdev, device, sizeof(newdev));
|
|
/* Suggest a new wlan device. */
|
|
/* FIXME: incrementing the index this way is not going to work well
|
|
* when the index is 9 or greater but the only consequence in this
|
|
* specific case would be an error message that looks a bit odd.
|
|
*/
|
|
newdev[strlen(newdev)-1]++;
|
|
error("%s is not a monitor mode VAP\n"
|
|
"To create a new monitor mode VAP use:\n"
|
|
" ifconfig %s create wlandev %s wlanmode monitor\n"
|
|
"and use %s as the tcpdump interface",
|
|
device, newdev, parent, newdev);
|
|
}
|
|
#endif
|
|
else
|
|
error("%s: %s", device,
|
|
pcap_statustostr(status));
|
|
pcap_close(pc);
|
|
return (NULL);
|
|
} else if (status > 0) {
|
|
/*
|
|
* pcap_activate() succeeded, but it's warning us
|
|
* of a problem it had.
|
|
*/
|
|
cp = pcap_geterr(pc);
|
|
if (status == PCAP_WARNING)
|
|
warning("%s", cp);
|
|
else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
|
|
*cp != '\0')
|
|
warning("%s: %s\n(%s)", device,
|
|
pcap_statustostr(status), cp);
|
|
else
|
|
warning("%s: %s", device,
|
|
pcap_statustostr(status));
|
|
}
|
|
#ifdef HAVE_PCAP_SETDIRECTION
|
|
if (Qflag != -1) {
|
|
status = pcap_setdirection(pc, Qflag);
|
|
if (status != 0)
|
|
error("%s: pcap_setdirection() failed: %s",
|
|
device, pcap_geterr(pc));
|
|
}
|
|
#endif /* HAVE_PCAP_SETDIRECTION */
|
|
#else /* HAVE_PCAP_CREATE */
|
|
*ebuf = '\0';
|
|
/*
|
|
* If no snapshot length was specified, or a length of 0 was
|
|
* specified, default to 256KB.
|
|
*/
|
|
if (ndo->ndo_snaplen == 0)
|
|
ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
|
|
pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, timeout, ebuf);
|
|
if (pc == NULL) {
|
|
/*
|
|
* If this failed with "No such device", that means
|
|
* the interface doesn't exist; return NULL, so that
|
|
* the caller can see whether the device name is
|
|
* actually an interface index.
|
|
*/
|
|
if (strstr(ebuf, "No such device") != NULL)
|
|
return (NULL);
|
|
error("%s", ebuf);
|
|
}
|
|
if (*ebuf)
|
|
warning("%s", ebuf);
|
|
#endif /* HAVE_PCAP_CREATE */
|
|
|
|
return (pc);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int cnt, op, i;
|
|
bpf_u_int32 localnet = 0, netmask = 0;
|
|
char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
|
|
char *endp;
|
|
pcap_handler callback;
|
|
int dlt;
|
|
const char *dlt_name;
|
|
struct bpf_program fcode;
|
|
#ifndef _WIN32
|
|
void (*oldhandler)(int);
|
|
#endif
|
|
struct dump_info dumpinfo;
|
|
u_char *pcap_userdata;
|
|
char ebuf[PCAP_ERRBUF_SIZE];
|
|
char VFileLine[PATH_MAX + 1];
|
|
const char *username = NULL;
|
|
#ifndef _WIN32
|
|
const char *chroot_dir = NULL;
|
|
#endif
|
|
char *ret = NULL;
|
|
char *end;
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
pcap_if_t *devlist;
|
|
long devnum;
|
|
#endif
|
|
int status;
|
|
FILE *VFile;
|
|
#ifdef HAVE_CAPSICUM
|
|
cap_rights_t rights;
|
|
int cansandbox;
|
|
#endif /* HAVE_CAPSICUM */
|
|
int Oflag = 1; /* run filter code optimizer */
|
|
int yflag_dlt = -1;
|
|
const char *yflag_dlt_name = NULL;
|
|
int print = 0;
|
|
|
|
netdissect_options Ndo;
|
|
netdissect_options *ndo = &Ndo;
|
|
|
|
/*
|
|
* Initialize the netdissect code.
|
|
*/
|
|
if (nd_init(ebuf, sizeof(ebuf)) == -1)
|
|
error("%s", ebuf);
|
|
|
|
memset(ndo, 0, sizeof(*ndo));
|
|
ndo_set_function_pointers(ndo);
|
|
|
|
cnt = -1;
|
|
device = NULL;
|
|
infile = NULL;
|
|
RFileName = NULL;
|
|
VFileName = NULL;
|
|
VFile = NULL;
|
|
WFileName = NULL;
|
|
dlt = -1;
|
|
if ((cp = strrchr(argv[0], PATH_SEPARATOR)) != NULL)
|
|
ndo->program_name = program_name = cp + 1;
|
|
else
|
|
ndo->program_name = program_name = argv[0];
|
|
|
|
#if defined(HAVE_PCAP_WSOCKINIT)
|
|
if (pcap_wsockinit() != 0)
|
|
error("Attempting to initialize Winsock failed");
|
|
#elif defined(HAVE_WSOCKINIT)
|
|
if (wsockinit() != 0)
|
|
error("Attempting to initialize Winsock failed");
|
|
#endif
|
|
|
|
/*
|
|
* On platforms where the CPU doesn't support unaligned loads,
|
|
* force unaligned accesses to abort with SIGBUS, rather than
|
|
* being fixed up (slowly) by the OS kernel; on those platforms,
|
|
* misaligned accesses are bugs, and we want tcpdump to crash so
|
|
* that the bugs are reported.
|
|
*/
|
|
if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
|
|
error("%s", ebuf);
|
|
|
|
while (
|
|
(op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
|
|
switch (op) {
|
|
|
|
case 'a':
|
|
/* compatibility for old -a */
|
|
break;
|
|
|
|
case 'A':
|
|
++ndo->ndo_Aflag;
|
|
break;
|
|
|
|
case 'b':
|
|
++ndo->ndo_bflag;
|
|
break;
|
|
|
|
#if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
|
|
case 'B':
|
|
Bflag = atoi(optarg)*1024;
|
|
if (Bflag <= 0)
|
|
error("invalid packet buffer size %s", optarg);
|
|
break;
|
|
#endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
|
|
|
|
case 'c':
|
|
cnt = atoi(optarg);
|
|
if (cnt <= 0)
|
|
error("invalid packet count %s", optarg);
|
|
break;
|
|
|
|
case 'C':
|
|
errno = 0;
|
|
#ifdef HAVE_PCAP_DUMP_FTELL64
|
|
Cflag = strtoint64_t(optarg, &endp, 10);
|
|
#else
|
|
Cflag = strtol(optarg, &endp, 10);
|
|
#endif
|
|
if (endp == optarg || *endp != '\0' || errno != 0
|
|
|| Cflag <= 0)
|
|
error("invalid file size %s", optarg);
|
|
/*
|
|
* Will multiplying it by 1000000 overflow?
|
|
*/
|
|
#ifdef HAVE_PCAP_DUMP_FTELL64
|
|
if (Cflag > INT64_T_CONSTANT(0x7fffffffffffffff) / 1000000)
|
|
#else
|
|
if (Cflag > LONG_MAX / 1000000)
|
|
#endif
|
|
error("file size %s is too large", optarg);
|
|
Cflag *= 1000000;
|
|
break;
|
|
|
|
case 'd':
|
|
++dflag;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
case 'D':
|
|
Dflag++;
|
|
break;
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
case OPTION_LIST_REMOTE_INTERFACES:
|
|
remote_interfaces_source = optarg;
|
|
break;
|
|
#endif
|
|
|
|
case 'L':
|
|
Lflag++;
|
|
break;
|
|
|
|
case 'e':
|
|
++ndo->ndo_eflag;
|
|
break;
|
|
|
|
case 'E':
|
|
#ifndef HAVE_LIBCRYPTO
|
|
warning("crypto code not compiled in");
|
|
#endif
|
|
ndo->ndo_espsecret = optarg;
|
|
break;
|
|
|
|
case 'f':
|
|
++ndo->ndo_fflag;
|
|
break;
|
|
|
|
case 'F':
|
|
infile = optarg;
|
|
break;
|
|
|
|
case 'G':
|
|
Gflag = atoi(optarg);
|
|
if (Gflag < 0)
|
|
error("invalid number of seconds %s", optarg);
|
|
|
|
/* We will create one file initially. */
|
|
Gflag_count = 0;
|
|
|
|
/* Grab the current time for rotation use. */
|
|
if ((Gflag_time = time(NULL)) == (time_t)-1) {
|
|
error("%s: can't get current time: %s",
|
|
__func__, pcap_strerror(errno));
|
|
}
|
|
break;
|
|
|
|
case 'h':
|
|
print_usage(stdout);
|
|
exit_tcpdump(S_SUCCESS);
|
|
break;
|
|
|
|
case 'H':
|
|
++ndo->ndo_Hflag;
|
|
break;
|
|
|
|
case 'i':
|
|
device = optarg;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_CREATE
|
|
case 'I':
|
|
++Iflag;
|
|
break;
|
|
#endif /* HAVE_PCAP_CREATE */
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
|
|
case 'j':
|
|
jflag = pcap_tstamp_type_name_to_val(optarg);
|
|
if (jflag < 0)
|
|
error("invalid time stamp type %s", optarg);
|
|
break;
|
|
|
|
case 'J':
|
|
Jflag++;
|
|
break;
|
|
#endif
|
|
|
|
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 */
|
|
lflag = 1;
|
|
break;
|
|
|
|
case 'K':
|
|
++ndo->ndo_Kflag;
|
|
break;
|
|
|
|
case 'm':
|
|
if (nd_have_smi_support()) {
|
|
if (nd_load_smi_module(optarg, ebuf, sizeof(ebuf)) == -1)
|
|
error("%s", ebuf);
|
|
} else {
|
|
(void)fprintf(stderr, "%s: ignoring option `-m %s' ",
|
|
program_name, optarg);
|
|
(void)fprintf(stderr, "(no libsmi support)\n");
|
|
}
|
|
break;
|
|
|
|
case 'M':
|
|
/* TCP-MD5 shared secret */
|
|
#ifndef HAVE_LIBCRYPTO
|
|
warning("crypto code not compiled in");
|
|
#endif
|
|
ndo->ndo_sigsecret = optarg;
|
|
break;
|
|
|
|
case 'n':
|
|
++ndo->ndo_nflag;
|
|
break;
|
|
|
|
case 'N':
|
|
++ndo->ndo_Nflag;
|
|
break;
|
|
|
|
case 'O':
|
|
Oflag = 0;
|
|
break;
|
|
|
|
case 'p':
|
|
++pflag;
|
|
break;
|
|
|
|
case 'q':
|
|
++ndo->ndo_qflag;
|
|
++ndo->ndo_suppress_default_print;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_SETDIRECTION
|
|
case 'Q':
|
|
if (ascii_strcasecmp(optarg, "in") == 0)
|
|
Qflag = PCAP_D_IN;
|
|
else if (ascii_strcasecmp(optarg, "out") == 0)
|
|
Qflag = PCAP_D_OUT;
|
|
else if (ascii_strcasecmp(optarg, "inout") == 0)
|
|
Qflag = PCAP_D_INOUT;
|
|
else
|
|
error("unknown capture direction `%s'", optarg);
|
|
break;
|
|
#endif /* HAVE_PCAP_SETDIRECTION */
|
|
|
|
case 'r':
|
|
RFileName = optarg;
|
|
break;
|
|
|
|
case 's':
|
|
ndo->ndo_snaplen = (int)strtol(optarg, &end, 0);
|
|
if (optarg == end || *end != '\0'
|
|
|| ndo->ndo_snaplen < 0 || ndo->ndo_snaplen > MAXIMUM_SNAPLEN)
|
|
error("invalid snaplen %s (must be >= 0 and <= %d)",
|
|
optarg, MAXIMUM_SNAPLEN);
|
|
break;
|
|
|
|
case 'S':
|
|
++ndo->ndo_Sflag;
|
|
break;
|
|
|
|
case 't':
|
|
++ndo->ndo_tflag;
|
|
break;
|
|
|
|
case 'T':
|
|
if (ascii_strcasecmp(optarg, "vat") == 0)
|
|
ndo->ndo_packettype = PT_VAT;
|
|
else if (ascii_strcasecmp(optarg, "wb") == 0)
|
|
ndo->ndo_packettype = PT_WB;
|
|
else if (ascii_strcasecmp(optarg, "rpc") == 0)
|
|
ndo->ndo_packettype = PT_RPC;
|
|
else if (ascii_strcasecmp(optarg, "rtp") == 0)
|
|
ndo->ndo_packettype = PT_RTP;
|
|
else if (ascii_strcasecmp(optarg, "rtcp") == 0)
|
|
ndo->ndo_packettype = PT_RTCP;
|
|
else if (ascii_strcasecmp(optarg, "snmp") == 0)
|
|
ndo->ndo_packettype = PT_SNMP;
|
|
else if (ascii_strcasecmp(optarg, "cnfp") == 0)
|
|
ndo->ndo_packettype = PT_CNFP;
|
|
else if (ascii_strcasecmp(optarg, "tftp") == 0)
|
|
ndo->ndo_packettype = PT_TFTP;
|
|
else if (ascii_strcasecmp(optarg, "aodv") == 0)
|
|
ndo->ndo_packettype = PT_AODV;
|
|
else if (ascii_strcasecmp(optarg, "carp") == 0)
|
|
ndo->ndo_packettype = PT_CARP;
|
|
else if (ascii_strcasecmp(optarg, "radius") == 0)
|
|
ndo->ndo_packettype = PT_RADIUS;
|
|
else if (ascii_strcasecmp(optarg, "zmtp1") == 0)
|
|
ndo->ndo_packettype = PT_ZMTP1;
|
|
else if (ascii_strcasecmp(optarg, "vxlan") == 0)
|
|
ndo->ndo_packettype = PT_VXLAN;
|
|
else if (ascii_strcasecmp(optarg, "pgm") == 0)
|
|
ndo->ndo_packettype = PT_PGM;
|
|
else if (ascii_strcasecmp(optarg, "pgm_zmtp1") == 0)
|
|
ndo->ndo_packettype = PT_PGM_ZMTP1;
|
|
else if (ascii_strcasecmp(optarg, "lmp") == 0)
|
|
ndo->ndo_packettype = PT_LMP;
|
|
else if (ascii_strcasecmp(optarg, "resp") == 0)
|
|
ndo->ndo_packettype = PT_RESP;
|
|
else if (ascii_strcasecmp(optarg, "ptp") == 0)
|
|
ndo->ndo_packettype = PT_PTP;
|
|
else if (ascii_strcasecmp(optarg, "someip") == 0)
|
|
ndo->ndo_packettype = PT_SOMEIP;
|
|
else if (ascii_strcasecmp(optarg, "domain") == 0)
|
|
ndo->ndo_packettype = PT_DOMAIN;
|
|
else
|
|
error("unknown packet type `%s'", optarg);
|
|
break;
|
|
|
|
case 'u':
|
|
++ndo->ndo_uflag;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
case 'U':
|
|
++Uflag;
|
|
break;
|
|
#endif
|
|
|
|
case 'v':
|
|
++ndo->ndo_vflag;
|
|
break;
|
|
|
|
case 'V':
|
|
VFileName = optarg;
|
|
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':
|
|
++ndo->ndo_xflag;
|
|
++ndo->ndo_suppress_default_print;
|
|
break;
|
|
|
|
case 'X':
|
|
++ndo->ndo_Xflag;
|
|
++ndo->ndo_suppress_default_print;
|
|
break;
|
|
|
|
case 'y':
|
|
yflag_dlt_name = optarg;
|
|
yflag_dlt =
|
|
pcap_datalink_name_to_val(yflag_dlt_name);
|
|
if (yflag_dlt < 0)
|
|
error("invalid data link type %s", yflag_dlt_name);
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_SET_PARSER_DEBUG
|
|
case 'Y':
|
|
{
|
|
/* Undocumented flag */
|
|
pcap_set_parser_debug(1);
|
|
}
|
|
break;
|
|
#endif
|
|
case 'z':
|
|
zflag = optarg;
|
|
break;
|
|
|
|
case 'Z':
|
|
username = optarg;
|
|
break;
|
|
|
|
case '#':
|
|
ndo->ndo_packet_number = 1;
|
|
break;
|
|
|
|
case OPTION_VERSION:
|
|
print_version(stdout);
|
|
exit_tcpdump(S_SUCCESS);
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
case OPTION_TSTAMP_PRECISION:
|
|
ndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg);
|
|
if (ndo->ndo_tstamp_precision < 0)
|
|
error("unsupported time stamp precision");
|
|
break;
|
|
#endif
|
|
|
|
#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
|
|
case OPTION_IMMEDIATE_MODE:
|
|
immediate_mode = 1;
|
|
break;
|
|
#endif
|
|
|
|
case OPTION_PRINT:
|
|
print = 1;
|
|
break;
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
case OPTION_TSTAMP_MICRO:
|
|
ndo->ndo_tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
|
|
break;
|
|
|
|
case OPTION_TSTAMP_NANO:
|
|
ndo->ndo_tstamp_precision = PCAP_TSTAMP_PRECISION_NANO;
|
|
break;
|
|
#endif
|
|
|
|
case OPTION_FP_TYPE:
|
|
/*
|
|
* Print out the type of floating-point arithmetic
|
|
* we're doing; it's probably IEEE, unless somebody
|
|
* tries to run this on a VAX, but the precision
|
|
* may differ (e.g., it might be 32-bit, 64-bit,
|
|
* or 80-bit).
|
|
*/
|
|
float_type_check(0x4e93312d);
|
|
return 0;
|
|
|
|
case OPTION_COUNT:
|
|
count_mode = 1;
|
|
break;
|
|
|
|
default:
|
|
print_usage(stderr);
|
|
exit_tcpdump(S_ERR_HOST_PROGRAM);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
if (Dflag)
|
|
show_devices_and_exit();
|
|
#endif
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
if (remote_interfaces_source != NULL)
|
|
show_remote_devices_and_exit();
|
|
#endif
|
|
|
|
#if defined(DLT_LINUX_SLL2) && defined(HAVE_PCAP_SET_DATALINK)
|
|
/* Set default linktype DLT_LINUX_SLL2 when capturing on the "any" device */
|
|
if (device != NULL &&
|
|
strncmp (device, "any", strlen("any")) == 0
|
|
&& yflag_dlt == -1)
|
|
yflag_dlt = DLT_LINUX_SLL2;
|
|
#endif
|
|
|
|
switch (ndo->ndo_tflag) {
|
|
|
|
case 0: /* Default */
|
|
case 1: /* No time stamp */
|
|
case 2: /* Unix timeval style */
|
|
case 3: /* Microseconds/nanoseconds since previous packet */
|
|
case 4: /* Date + Default */
|
|
case 5: /* Microseconds/nanoseconds since first packet */
|
|
break;
|
|
|
|
default: /* Not supported */
|
|
error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
|
|
break;
|
|
}
|
|
|
|
if (ndo->ndo_fflag != 0 && (VFileName != NULL || RFileName != NULL))
|
|
error("-f can not be used with -V or -r");
|
|
|
|
if (VFileName != NULL && RFileName != NULL)
|
|
error("-V and -r are mutually exclusive.");
|
|
|
|
/*
|
|
* If we're printing dissected packets to the standard output,
|
|
* and either the standard output is a terminal or we're doing
|
|
* "line" buffering, set the capture timeout to .1 second rather
|
|
* than 1 second, as the user's probably expecting to see packets
|
|
* pop up immediately shortly after they arrive.
|
|
*
|
|
* XXX - would there be some value appropriate for all cases,
|
|
* based on, say, the buffer size and packet input rate?
|
|
*/
|
|
if ((WFileName == NULL || print) && (isatty(1) || lflag))
|
|
timeout = 100;
|
|
|
|
#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 || VFileName != NULL) {
|
|
/*
|
|
* If RFileName is non-null, it's the pathname of a
|
|
* savefile to read. If VFileName is non-null, it's
|
|
* the pathname of a file containing a list of pathnames
|
|
* (one per line) of savefiles to read.
|
|
*
|
|
* In either case, we're reading a savefile, not doing
|
|
* a live capture.
|
|
*/
|
|
#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 */
|
|
if (VFileName != NULL) {
|
|
if (VFileName[0] == '-' && VFileName[1] == '\0')
|
|
VFile = stdin;
|
|
else
|
|
VFile = fopen(VFileName, "r");
|
|
|
|
if (VFile == NULL)
|
|
error("Unable to open file: %s\n", pcap_strerror(errno));
|
|
|
|
ret = get_next_file(VFile, VFileLine);
|
|
if (!ret)
|
|
error("Nothing in %s\n", VFileName);
|
|
RFileName = VFileLine;
|
|
}
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
pd = pcap_open_offline_with_tstamp_precision(RFileName,
|
|
ndo->ndo_tstamp_precision, ebuf);
|
|
#else
|
|
pd = pcap_open_offline(RFileName, ebuf);
|
|
#endif
|
|
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
#ifdef HAVE_CAPSICUM
|
|
cap_rights_init(&rights, CAP_READ);
|
|
if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
|
|
errno != ENOSYS) {
|
|
error("unable to limit pcap descriptor");
|
|
}
|
|
#endif
|
|
dlt = pcap_datalink(pd);
|
|
dlt_name = pcap_datalink_val_to_name(dlt);
|
|
fprintf(stderr, "reading from file %s", RFileName);
|
|
if (dlt_name == NULL) {
|
|
fprintf(stderr, ", link-type %u", dlt);
|
|
} else {
|
|
fprintf(stderr, ", link-type %s (%s)", dlt_name,
|
|
pcap_datalink_val_to_description(dlt));
|
|
}
|
|
fprintf(stderr, ", snapshot length %d\n", pcap_snapshot(pd));
|
|
#ifdef DLT_LINUX_SLL2
|
|
if (dlt == DLT_LINUX_SLL2)
|
|
fprintf(stderr, "Warning: interface names might be incorrect\n");
|
|
#endif
|
|
} else if (dflag && !device) {
|
|
int dump_dlt = DLT_EN10MB;
|
|
/*
|
|
* We're dumping the compiled code without an explicit
|
|
* device specification. (If a device is specified, we
|
|
* definitely want to open it to use the DLT of that device.)
|
|
* Either default to DLT_EN10MB with a warning, or use
|
|
* the user-specified value if supplied.
|
|
*/
|
|
/*
|
|
* If no snapshot length was specified, or a length of 0 was
|
|
* specified, default to 256KB.
|
|
*/
|
|
if (ndo->ndo_snaplen == 0)
|
|
ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
|
|
/*
|
|
* If a DLT was specified with the -y flag, use that instead.
|
|
*/
|
|
if (yflag_dlt != -1)
|
|
dump_dlt = yflag_dlt;
|
|
else
|
|
fprintf(stderr, "Warning: assuming Ethernet\n");
|
|
pd = pcap_open_dead(dump_dlt, ndo->ndo_snaplen);
|
|
} else {
|
|
/*
|
|
* We're doing a live capture.
|
|
*/
|
|
if (device == NULL) {
|
|
/*
|
|
* No interface was specified. Pick one.
|
|
*/
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
/*
|
|
* Find the list of interfaces, and pick
|
|
* the first interface.
|
|
*/
|
|
if (pcap_findalldevs(&devlist, ebuf) == -1)
|
|
error("%s", ebuf);
|
|
if (devlist == NULL)
|
|
error("no interfaces available for capture");
|
|
device = strdup(devlist->name);
|
|
pcap_freealldevs(devlist);
|
|
#else /* HAVE_PCAP_FINDALLDEVS */
|
|
/*
|
|
* Use whatever interface pcap_lookupdev()
|
|
* chooses.
|
|
*/
|
|
device = pcap_lookupdev(ebuf);
|
|
if (device == NULL)
|
|
error("%s", ebuf);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Try to open the interface with the specified name.
|
|
*/
|
|
pd = open_interface(device, ndo, ebuf);
|
|
if (pd == NULL) {
|
|
/*
|
|
* That failed. If we can get a list of
|
|
* interfaces, and the interface name
|
|
* is purely numeric, try to use it as
|
|
* a 1-based index in the list of
|
|
* interfaces.
|
|
*/
|
|
#ifdef HAVE_PCAP_FINDALLDEVS
|
|
devnum = parse_interface_number(device);
|
|
if (devnum == -1) {
|
|
/*
|
|
* It's not a number; just report
|
|
* the open error and fail.
|
|
*/
|
|
error("%s", ebuf);
|
|
}
|
|
|
|
/*
|
|
* OK, it's a number; try to find the
|
|
* interface with that index, and try
|
|
* to open it.
|
|
*
|
|
* find_interface_by_number() exits if it
|
|
* couldn't be found.
|
|
*/
|
|
device = find_interface_by_number(device, devnum);
|
|
pd = open_interface(device, ndo, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
#else /* HAVE_PCAP_FINDALLDEVS */
|
|
/*
|
|
* We can't get a list of interfaces; just
|
|
* fail.
|
|
*/
|
|
error("%s", ebuf);
|
|
#endif /* HAVE_PCAP_FINDALLDEVS */
|
|
}
|
|
|
|
/*
|
|
* Let user own process after capture device has
|
|
* been opened.
|
|
*/
|
|
#ifndef _WIN32
|
|
if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
|
|
fprintf(stderr, "Warning: setgid/setuid failed !\n");
|
|
#endif /* _WIN32 */
|
|
#if !defined(HAVE_PCAP_CREATE) && defined(_WIN32)
|
|
if(Bflag != 0)
|
|
if(pcap_setbuff(pd, Bflag)==-1){
|
|
error("%s", pcap_geterr(pd));
|
|
}
|
|
#endif /* !defined(HAVE_PCAP_CREATE) && defined(_WIN32) */
|
|
if (Lflag)
|
|
show_dlts_and_exit(pd, device);
|
|
if (yflag_dlt >= 0) {
|
|
#ifdef HAVE_PCAP_SET_DATALINK
|
|
if (pcap_set_datalink(pd, yflag_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 (yflag_dlt != pcap_datalink(pd)) {
|
|
error("%s is not one of the DLTs supported by this device\n",
|
|
yflag_dlt_name);
|
|
}
|
|
#endif
|
|
(void)fprintf(stderr, "%s: data link type %s\n",
|
|
program_name,
|
|
pcap_datalink_val_to_name(yflag_dlt));
|
|
(void)fflush(stderr);
|
|
}
|
|
i = pcap_snapshot(pd);
|
|
if (ndo->ndo_snaplen < i) {
|
|
if (ndo->ndo_snaplen != 0)
|
|
warning("snaplen raised from %d to %d", ndo->ndo_snaplen, i);
|
|
ndo->ndo_snaplen = i;
|
|
} else if (ndo->ndo_snaplen > i) {
|
|
warning("snaplen lowered from %d to %d", ndo->ndo_snaplen, i);
|
|
ndo->ndo_snaplen = i;
|
|
}
|
|
if(ndo->ndo_fflag != 0) {
|
|
if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
|
|
warning("foreign (-f) flag used but: %s", ebuf);
|
|
}
|
|
}
|
|
|
|
}
|
|
if (infile)
|
|
cmdbuf = read_infile(infile);
|
|
else
|
|
cmdbuf = copy_argv(&argv[optind]);
|
|
|
|
#ifdef HAVE_PCAP_SET_OPTIMIZER_DEBUG
|
|
pcap_set_optimizer_debug(dflag);
|
|
#endif
|
|
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
if (dflag) {
|
|
bpf_dump(&fcode, dflag);
|
|
pcap_close(pd);
|
|
free(cmdbuf);
|
|
pcap_freecode(&fcode);
|
|
exit_tcpdump(S_SUCCESS);
|
|
}
|
|
|
|
#ifdef HAVE_CASPER
|
|
if (!ndo->ndo_nflag)
|
|
capdns = capdns_setup();
|
|
#endif /* HAVE_CASPER */
|
|
|
|
init_print(ndo, localnet, netmask);
|
|
|
|
#ifndef _WIN32
|
|
(void)setsignal(SIGPIPE, cleanup);
|
|
(void)setsignal(SIGTERM, cleanup);
|
|
#endif /* _WIN32 */
|
|
(void)setsignal(SIGINT, cleanup);
|
|
#if defined(HAVE_FORK) || defined(HAVE_VFORK)
|
|
(void)setsignal(SIGCHLD, child_cleanup);
|
|
#endif
|
|
/* Cooperate with nohup(1) */
|
|
#ifndef _WIN32
|
|
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
|
|
(void)setsignal(SIGHUP, oldhandler);
|
|
#endif /* _WIN32 */
|
|
|
|
#ifndef _WIN32
|
|
/*
|
|
* If a user name was specified with "-Z", attempt to switch to
|
|
* that user's UID. This would probably be used with sudo,
|
|
* to allow tcpdump to be run in a special restricted
|
|
* account (if you just want to allow users to open capture
|
|
* devices, and can't just give users that permission,
|
|
* you'd make tcpdump set-UID or set-GID).
|
|
*
|
|
* Tcpdump doesn't necessarily write only to one savefile;
|
|
* the general only way to allow a -Z instance to write to
|
|
* savefiles as the user under whose UID it's run, rather
|
|
* than as the user specified with -Z, would thus be to switch
|
|
* to the original user ID before opening a capture file and
|
|
* then switch back to the -Z user ID after opening the savefile.
|
|
* Switching to the -Z user ID only after opening the first
|
|
* savefile doesn't handle the general case.
|
|
*/
|
|
|
|
if (getuid() == 0 || geteuid() == 0) {
|
|
#ifdef HAVE_LIBCAP_NG
|
|
/* Initialize capng */
|
|
capng_clear(CAPNG_SELECT_BOTH);
|
|
if (username) {
|
|
DIAG_OFF_ASSIGN_ENUM
|
|
capng_updatev(
|
|
CAPNG_ADD,
|
|
CAPNG_PERMITTED | CAPNG_EFFECTIVE,
|
|
CAP_SETUID,
|
|
CAP_SETGID,
|
|
-1);
|
|
DIAG_ON_ASSIGN_ENUM
|
|
}
|
|
if (chroot_dir) {
|
|
DIAG_OFF_ASSIGN_ENUM
|
|
capng_update(
|
|
CAPNG_ADD,
|
|
CAPNG_PERMITTED | CAPNG_EFFECTIVE,
|
|
CAP_SYS_CHROOT
|
|
);
|
|
DIAG_ON_ASSIGN_ENUM
|
|
}
|
|
|
|
if (WFileName) {
|
|
DIAG_OFF_ASSIGN_ENUM
|
|
capng_update(
|
|
CAPNG_ADD,
|
|
CAPNG_PERMITTED | CAPNG_EFFECTIVE,
|
|
CAP_DAC_OVERRIDE
|
|
);
|
|
DIAG_ON_ASSIGN_ENUM
|
|
}
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
if (username || chroot_dir) {
|
|
#ifndef HAVE_LIBCAP_NG
|
|
if (!WFileName)
|
|
#endif
|
|
droproot(username, chroot_dir);
|
|
}
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
if (pcap_setfilter(pd, &fcode) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
#ifdef HAVE_CAPSICUM
|
|
if (RFileName == NULL && VFileName == NULL && pcap_fileno(pd) != -1) {
|
|
static const unsigned long cmds[] = { BIOCGSTATS, BIOCROTZBUF };
|
|
|
|
/*
|
|
* The various libpcap devices use a combination of
|
|
* read (bpf), ioctl (bpf, netmap), poll (netmap)
|
|
* so we add the relevant access rights.
|
|
*/
|
|
cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_EVENT);
|
|
if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
|
|
errno != ENOSYS) {
|
|
error("unable to limit pcap descriptor");
|
|
}
|
|
if (cap_ioctls_limit(pcap_fileno(pd), cmds,
|
|
sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
|
|
error("unable to limit ioctls on pcap descriptor");
|
|
}
|
|
}
|
|
#endif
|
|
if (WFileName) {
|
|
/* Do not exceed the default PATH_MAX for files. */
|
|
dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
|
|
|
|
if (dumpinfo.CurrentFileName == NULL)
|
|
error("malloc of dumpinfo.CurrentFileName");
|
|
|
|
/* We do not need numbering for dumpfiles if Cflag isn't set. */
|
|
if (Cflag != 0)
|
|
MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
|
|
else
|
|
MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
|
|
|
|
pdd = pcap_dump_open(pd, dumpinfo.CurrentFileName);
|
|
#ifdef HAVE_LIBCAP_NG
|
|
/* Give up CAP_DAC_OVERRIDE capability.
|
|
* Only allow it to be restored if the -C or -G flag have been
|
|
* set since we may need to create more files later on.
|
|
*/
|
|
capng_update(
|
|
CAPNG_DROP,
|
|
(Cflag || Gflag ? 0 : CAPNG_PERMITTED)
|
|
| CAPNG_EFFECTIVE,
|
|
CAP_DAC_OVERRIDE
|
|
);
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
if (pdd == NULL)
|
|
error("%s", pcap_geterr(pd));
|
|
#ifdef HAVE_CAPSICUM
|
|
set_dumper_capsicum_rights(pdd);
|
|
#endif
|
|
if (Cflag != 0 || Gflag != 0) {
|
|
#ifdef HAVE_CAPSICUM
|
|
/*
|
|
* basename() and dirname() may modify their input buffer
|
|
* and they do since FreeBSD 12.0, but they didn't before.
|
|
* Hence use the return value only, but always assume the
|
|
* input buffer has been modified and would need to be
|
|
* reset before the next use.
|
|
*/
|
|
char *WFileName_copy;
|
|
|
|
if ((WFileName_copy = strdup(WFileName)) == NULL) {
|
|
error("Unable to allocate memory for file %s",
|
|
WFileName);
|
|
}
|
|
DIAG_OFF_C11_EXTENSIONS
|
|
dumpinfo.WFileName = strdup(basename(WFileName_copy));
|
|
DIAG_ON_C11_EXTENSIONS
|
|
if (dumpinfo.WFileName == NULL) {
|
|
error("Unable to allocate memory for file %s",
|
|
WFileName);
|
|
}
|
|
free(WFileName_copy);
|
|
|
|
if ((WFileName_copy = strdup(WFileName)) == NULL) {
|
|
error("Unable to allocate memory for file %s",
|
|
WFileName);
|
|
}
|
|
DIAG_OFF_C11_EXTENSIONS
|
|
char *WFileName_dirname = dirname(WFileName_copy);
|
|
DIAG_ON_C11_EXTENSIONS
|
|
dumpinfo.dirfd = open(WFileName_dirname,
|
|
O_DIRECTORY | O_RDONLY);
|
|
if (dumpinfo.dirfd < 0) {
|
|
error("unable to open directory %s",
|
|
WFileName_dirname);
|
|
}
|
|
free(WFileName_dirname);
|
|
free(WFileName_copy);
|
|
|
|
cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
|
|
CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
|
|
if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
|
|
errno != ENOSYS) {
|
|
error("unable to limit directory rights");
|
|
}
|
|
if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 &&
|
|
errno != ENOSYS) {
|
|
error("unable to limit dump descriptor fcntls");
|
|
}
|
|
#else /* !HAVE_CAPSICUM */
|
|
dumpinfo.WFileName = WFileName;
|
|
#endif
|
|
callback = dump_packet_and_trunc;
|
|
dumpinfo.pd = pd;
|
|
dumpinfo.pdd = pdd;
|
|
pcap_userdata = (u_char *)&dumpinfo;
|
|
} else {
|
|
callback = dump_packet;
|
|
dumpinfo.WFileName = WFileName;
|
|
dumpinfo.pd = pd;
|
|
dumpinfo.pdd = pdd;
|
|
pcap_userdata = (u_char *)&dumpinfo;
|
|
}
|
|
if (print) {
|
|
dlt = pcap_datalink(pd);
|
|
ndo->ndo_if_printer = get_if_printer(dlt);
|
|
dumpinfo.ndo = ndo;
|
|
} else
|
|
dumpinfo.ndo = NULL;
|
|
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
if (Uflag)
|
|
pcap_dump_flush(pdd);
|
|
#endif
|
|
} else {
|
|
dlt = pcap_datalink(pd);
|
|
ndo->ndo_if_printer = get_if_printer(dlt);
|
|
callback = print_packet;
|
|
pcap_userdata = (u_char *)ndo;
|
|
}
|
|
|
|
#ifdef SIGNAL_REQ_INFO
|
|
/*
|
|
* We can't get statistics when reading from a file rather
|
|
* than capturing from a device.
|
|
*/
|
|
if (RFileName == NULL)
|
|
(void)setsignal(SIGNAL_REQ_INFO, requestinfo);
|
|
#endif
|
|
#ifdef SIGNAL_FLUSH_PCAP
|
|
(void)setsignal(SIGNAL_FLUSH_PCAP, flushpcap);
|
|
#endif
|
|
|
|
if (ndo->ndo_vflag > 0 && WFileName && RFileName == NULL && !print) {
|
|
/*
|
|
* When capturing to a file, if "--print" wasn't specified,
|
|
*"-v" means tcpdump should, once per second,
|
|
* "v"erbosely report the number of packets captured.
|
|
* Except when reading from a file, because -r, -w and -v
|
|
* together used to make a corner case, in which pcap_loop()
|
|
* errored due to EINTR (see GH #155 for details).
|
|
*/
|
|
#ifdef _WIN32
|
|
/*
|
|
* https://blogs.msdn.microsoft.com/oldnewthing/20151230-00/?p=92741
|
|
*
|
|
* suggests that this dates back to W2K.
|
|
*
|
|
* I don't know what a "long wait" is, but we'll assume
|
|
* that printing the stats could be a "long wait".
|
|
*/
|
|
CreateTimerQueueTimer(&timer_handle, NULL,
|
|
verbose_stats_dump, NULL, 1000, 1000,
|
|
WT_EXECUTEDEFAULT|WT_EXECUTELONGFUNCTION);
|
|
setvbuf(stderr, NULL, _IONBF, 0);
|
|
#else /* _WIN32 */
|
|
/*
|
|
* Assume this is UN*X, and that it has setitimer(); that
|
|
* dates back to UNIX 95.
|
|
*/
|
|
struct itimerval timer;
|
|
(void)setsignal(SIGALRM, verbose_stats_dump);
|
|
timer.it_interval.tv_sec = 1;
|
|
timer.it_interval.tv_usec = 0;
|
|
timer.it_value.tv_sec = 1;
|
|
timer.it_value.tv_usec = 1;
|
|
setitimer(ITIMER_REAL, &timer, NULL);
|
|
#endif /* _WIN32 */
|
|
}
|
|
|
|
if (RFileName == NULL) {
|
|
/*
|
|
* Live capture (if -V was specified, we set RFileName
|
|
* to a file from the -V file). Print a message to
|
|
* the standard error on UN*X.
|
|
*/
|
|
if (!ndo->ndo_vflag && !WFileName) {
|
|
(void)fprintf(stderr,
|
|
"%s: verbose output suppressed, use -v[v]... 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);
|
|
(void)fprintf(stderr, "listening on %s", device);
|
|
if (dlt_name == NULL) {
|
|
(void)fprintf(stderr, ", link-type %u", dlt);
|
|
} else {
|
|
(void)fprintf(stderr, ", link-type %s (%s)", dlt_name,
|
|
pcap_datalink_val_to_description(dlt));
|
|
}
|
|
(void)fprintf(stderr, ", snapshot length %d bytes\n", ndo->ndo_snaplen);
|
|
(void)fflush(stderr);
|
|
}
|
|
|
|
/*
|
|
* If a user name was specified with "-Z", attempt to switch to
|
|
* that user's UID. This would probably be used with sudo,
|
|
* to allow tcpdump to be run in a special restricted
|
|
* account (if you just want to allow users to open capture
|
|
* devices, and can't just give users that permission,
|
|
* you'd make tcpdump set-UID or set-GID).
|
|
*
|
|
* Tcpdump doesn't necessarily write only to one savefile;
|
|
* the general only way to allow a -Z instance to write to
|
|
* savefiles as the user under whose UID it's run, rather
|
|
* than as the user specified with -Z, would thus be to switch
|
|
* to the original user ID before opening a capture file and
|
|
* then switch back to the -Z user ID after opening the savefile.
|
|
* Switching to the -Z user ID only after opening the first
|
|
* savefile doesn't handle the general case.
|
|
*/
|
|
if (getuid() == 0 || geteuid() == 0) {
|
|
if (username || chroot_dir)
|
|
droproot(username, chroot_dir);
|
|
}
|
|
|
|
#ifdef HAVE_CAPSICUM
|
|
cansandbox = (VFileName == NULL && zflag == NULL);
|
|
#ifdef HAVE_CASPER
|
|
cansandbox = (cansandbox && (ndo->ndo_nflag || capdns != NULL));
|
|
#else
|
|
cansandbox = (cansandbox && ndo->ndo_nflag);
|
|
#endif /* HAVE_CASPER */
|
|
if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
|
|
error("unable to enter the capability mode");
|
|
#endif /* HAVE_CAPSICUM */
|
|
|
|
do {
|
|
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 == -2) {
|
|
/*
|
|
* We got interrupted. If we are reading multiple
|
|
* files (via -V) set these so that we stop.
|
|
*/
|
|
VFileName = NULL;
|
|
ret = NULL;
|
|
}
|
|
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);
|
|
if (VFileName != NULL) {
|
|
ret = get_next_file(VFile, VFileLine);
|
|
if (ret) {
|
|
int new_dlt;
|
|
|
|
RFileName = VFileLine;
|
|
pd = pcap_open_offline(RFileName, ebuf);
|
|
if (pd == NULL)
|
|
error("%s", ebuf);
|
|
#ifdef HAVE_CAPSICUM
|
|
cap_rights_init(&rights, CAP_READ);
|
|
if (cap_rights_limit(fileno(pcap_file(pd)),
|
|
&rights) < 0 && errno != ENOSYS) {
|
|
error("unable to limit pcap descriptor");
|
|
}
|
|
#endif
|
|
new_dlt = pcap_datalink(pd);
|
|
if (new_dlt != dlt) {
|
|
/*
|
|
* The new file has a different
|
|
* link-layer header type from the
|
|
* previous one.
|
|
*/
|
|
if (WFileName != NULL) {
|
|
/*
|
|
* We're writing raw packets
|
|
* that match the filter to
|
|
* a pcap file. pcap files
|
|
* don't support multiple
|
|
* different link-layer
|
|
* header types, so we fail
|
|
* here.
|
|
*/
|
|
error("%s: new dlt does not match original", RFileName);
|
|
}
|
|
|
|
/*
|
|
* We're printing the decoded packets;
|
|
* switch to the new DLT.
|
|
*
|
|
* To do that, we need to change
|
|
* the printer, change the DLT name,
|
|
* and recompile the filter with
|
|
* the new DLT.
|
|
*/
|
|
dlt = new_dlt;
|
|
ndo->ndo_if_printer = get_if_printer(dlt);
|
|
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
}
|
|
|
|
/*
|
|
* Set the filter on the new file.
|
|
*/
|
|
if (pcap_setfilter(pd, &fcode) < 0)
|
|
error("%s", pcap_geterr(pd));
|
|
|
|
/*
|
|
* Report the new file.
|
|
*/
|
|
dlt_name = pcap_datalink_val_to_name(dlt);
|
|
fprintf(stderr, "reading from file %s", RFileName);
|
|
if (dlt_name == NULL) {
|
|
fprintf(stderr, ", link-type %u", dlt);
|
|
} else {
|
|
fprintf(stderr, ", link-type %s (%s)",
|
|
dlt_name,
|
|
pcap_datalink_val_to_description(dlt));
|
|
}
|
|
fprintf(stderr, ", snapshot length %d\n", pcap_snapshot(pd));
|
|
}
|
|
}
|
|
}
|
|
while (ret != NULL);
|
|
|
|
if (count_mode && RFileName != NULL)
|
|
fprintf(stdout, "%u packet%s\n", packets_captured,
|
|
PLURAL_SUFFIX(packets_captured));
|
|
|
|
free(cmdbuf);
|
|
pcap_freecode(&fcode);
|
|
exit_tcpdump(status == -1 ? S_ERR_HOST_PROGRAM : S_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Catch a signal.
|
|
*/
|
|
static void
|
|
(*setsignal (int sig, void (*func)(int)))(int)
|
|
{
|
|
#ifdef _WIN32
|
|
return (signal(sig, func));
|
|
#else
|
|
struct sigaction old, new;
|
|
|
|
memset(&new, 0, sizeof(new));
|
|
new.sa_handler = func;
|
|
if ((sig == SIGCHLD)
|
|
# ifdef SIGNAL_REQ_INFO
|
|
|| (sig == SIGNAL_REQ_INFO)
|
|
# endif
|
|
# ifdef SIGNAL_FLUSH_PCAP
|
|
|| (sig == SIGNAL_FLUSH_PCAP)
|
|
# endif
|
|
)
|
|
new.sa_flags = SA_RESTART;
|
|
if (sigaction(sig, &new, &old) < 0)
|
|
return (SIG_ERR);
|
|
return (old.sa_handler);
|
|
#endif
|
|
}
|
|
|
|
/* make a clean exit on interrupts */
|
|
static void
|
|
cleanup(int signo _U_)
|
|
{
|
|
#ifdef _WIN32
|
|
if (timer_handle != INVALID_HANDLE_VALUE) {
|
|
DeleteTimerQueueTimer(NULL, timer_handle, NULL);
|
|
CloseHandle(timer_handle);
|
|
timer_handle = INVALID_HANDLE_VALUE;
|
|
}
|
|
#else /* _WIN32 */
|
|
struct itimerval timer;
|
|
|
|
timer.it_interval.tv_sec = 0;
|
|
timer.it_interval.tv_usec = 0;
|
|
timer.it_value.tv_sec = 0;
|
|
timer.it_value.tv_usec = 0;
|
|
setitimer(ITIMER_REAL, &timer, NULL);
|
|
#endif /* _WIN32 */
|
|
|
|
#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_tcpdump(S_SUCCESS);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
On windows, we do not use a fork, so we do not care less about
|
|
waiting a child processes to die
|
|
*/
|
|
#if defined(HAVE_FORK) || defined(HAVE_VFORK)
|
|
static void
|
|
child_cleanup(int signo _U_)
|
|
{
|
|
wait(NULL);
|
|
}
|
|
#endif /* HAVE_FORK && HAVE_VFORK */
|
|
|
|
static void
|
|
info(int verbose)
|
|
{
|
|
struct pcap_stat stats;
|
|
|
|
/*
|
|
* Older versions of libpcap didn't set ps_ifdrop on some
|
|
* platforms; initialize it to 0 to handle that.
|
|
*/
|
|
stats.ps_ifdrop = 0;
|
|
if (pcap_stats(pd, &stats) < 0) {
|
|
(void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
|
|
infoprint = 0;
|
|
return;
|
|
}
|
|
|
|
if (!verbose)
|
|
fprintf(stderr, "%s: ", program_name);
|
|
|
|
(void)fprintf(stderr, "%u packet%s captured", packets_captured,
|
|
PLURAL_SUFFIX(packets_captured));
|
|
if (!verbose)
|
|
fputs(", ", stderr);
|
|
else
|
|
putc('\n', stderr);
|
|
(void)fprintf(stderr, "%u packet%s received by filter", stats.ps_recv,
|
|
PLURAL_SUFFIX(stats.ps_recv));
|
|
if (!verbose)
|
|
fputs(", ", stderr);
|
|
else
|
|
putc('\n', stderr);
|
|
(void)fprintf(stderr, "%u packet%s dropped by kernel", stats.ps_drop,
|
|
PLURAL_SUFFIX(stats.ps_drop));
|
|
if (stats.ps_ifdrop != 0) {
|
|
if (!verbose)
|
|
fputs(", ", stderr);
|
|
else
|
|
putc('\n', stderr);
|
|
(void)fprintf(stderr, "%u packet%s dropped by interface\n",
|
|
stats.ps_ifdrop, PLURAL_SUFFIX(stats.ps_ifdrop));
|
|
} else
|
|
putc('\n', stderr);
|
|
infoprint = 0;
|
|
}
|
|
|
|
#if defined(HAVE_FORK) || defined(HAVE_VFORK)
|
|
#ifdef HAVE_FORK
|
|
#define fork_subprocess() fork()
|
|
#else
|
|
#define fork_subprocess() vfork()
|
|
#endif
|
|
static void
|
|
compress_savefile(const char *filename)
|
|
{
|
|
pid_t child;
|
|
|
|
child = fork_subprocess();
|
|
if (child == -1) {
|
|
fprintf(stderr,
|
|
"compress_savefile: fork failed: %s\n",
|
|
pcap_strerror(errno));
|
|
return;
|
|
}
|
|
if (child != 0) {
|
|
/* Parent process. */
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Child process.
|
|
* Set to lowest priority so that this doesn't disturb the capture.
|
|
*/
|
|
#ifdef NZERO
|
|
setpriority(PRIO_PROCESS, 0, NZERO - 1);
|
|
#else
|
|
setpriority(PRIO_PROCESS, 0, 19);
|
|
#endif
|
|
if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
|
|
fprintf(stderr,
|
|
"compress_savefile: execlp(%s, %s) failed: %s\n",
|
|
zflag,
|
|
filename,
|
|
pcap_strerror(errno));
|
|
#ifdef HAVE_FORK
|
|
exit(S_ERR_HOST_PROGRAM);
|
|
#else
|
|
_exit(S_ERR_HOST_PROGRAM);
|
|
#endif
|
|
}
|
|
#else /* HAVE_FORK && HAVE_VFORK */
|
|
static void
|
|
compress_savefile(const char *filename)
|
|
{
|
|
fprintf(stderr,
|
|
"compress_savefile failed. Functionality not implemented under your system\n");
|
|
}
|
|
#endif /* HAVE_FORK && HAVE_VFORK */
|
|
|
|
static void
|
|
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
struct dump_info *dump_info;
|
|
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
|
|
dump_info = (struct dump_info *)user;
|
|
|
|
/*
|
|
* XXX - this won't force the file to rotate on the specified time
|
|
* boundary, but it will rotate on the first packet received after the
|
|
* specified Gflag number of seconds. Note: if a Gflag time boundary
|
|
* and a Cflag size boundary coincide, the time rotation will occur
|
|
* first thereby cancelling the Cflag boundary (since the file should
|
|
* be 0).
|
|
*/
|
|
if (Gflag != 0) {
|
|
/* Check if it is time to rotate */
|
|
time_t t;
|
|
|
|
/* Get the current time */
|
|
if ((t = time(NULL)) == (time_t)-1) {
|
|
error("%s: can't get current_time: %s",
|
|
__func__, pcap_strerror(errno));
|
|
}
|
|
|
|
|
|
/* If the time is greater than the specified window, rotate */
|
|
if (t - Gflag_time >= Gflag) {
|
|
#ifdef HAVE_CAPSICUM
|
|
FILE *fp;
|
|
int fd;
|
|
#endif
|
|
|
|
/* Update the Gflag_time */
|
|
Gflag_time = t;
|
|
/* Update Gflag_count */
|
|
Gflag_count++;
|
|
/*
|
|
* Close the current file and open a new one.
|
|
*/
|
|
pcap_dump_close(dump_info->pdd);
|
|
|
|
/*
|
|
* Compress the file we just closed, if the user asked for it
|
|
*/
|
|
if (zflag != NULL)
|
|
compress_savefile(dump_info->CurrentFileName);
|
|
|
|
/*
|
|
* Check to see if we've exceeded the Wflag (when
|
|
* not using Cflag).
|
|
*/
|
|
if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
|
|
(void)fprintf(stderr, "Maximum file limit reached: %d\n",
|
|
Wflag);
|
|
info(1);
|
|
exit_tcpdump(S_SUCCESS);
|
|
/* NOTREACHED */
|
|
}
|
|
if (dump_info->CurrentFileName != NULL)
|
|
free(dump_info->CurrentFileName);
|
|
/* Allocate space for max filename + \0. */
|
|
dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
|
|
if (dump_info->CurrentFileName == NULL)
|
|
error("dump_packet_and_trunc: malloc");
|
|
/*
|
|
* Gflag was set otherwise we wouldn't be here. Reset the count
|
|
* so multiple files would end with 1,2,3 in the filename.
|
|
* The counting is handled with the -C flow after this.
|
|
*/
|
|
Cflag_count = 0;
|
|
|
|
/*
|
|
* This is always the first file in the Cflag
|
|
* rotation: e.g. 0
|
|
* We also don't need numbering if Cflag is not set.
|
|
*/
|
|
if (Cflag != 0)
|
|
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
|
|
WflagChars);
|
|
else
|
|
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
|
|
|
|
#ifdef HAVE_LIBCAP_NG
|
|
capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
#ifdef HAVE_CAPSICUM
|
|
fd = openat(dump_info->dirfd,
|
|
dump_info->CurrentFileName,
|
|
O_CREAT | O_WRONLY | O_TRUNC, 0644);
|
|
if (fd < 0) {
|
|
error("unable to open file %s",
|
|
dump_info->CurrentFileName);
|
|
}
|
|
fp = fdopen(fd, "w");
|
|
if (fp == NULL) {
|
|
error("unable to fdopen file %s",
|
|
dump_info->CurrentFileName);
|
|
}
|
|
dump_info->pdd = pcap_dump_fopen(dump_info->pd, fp);
|
|
#else /* !HAVE_CAPSICUM */
|
|
dump_info->pdd = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
|
|
#endif
|
|
#ifdef HAVE_LIBCAP_NG
|
|
capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
if (dump_info->pdd == NULL)
|
|
error("%s", pcap_geterr(pd));
|
|
#ifdef HAVE_CAPSICUM
|
|
set_dumper_capsicum_rights(dump_info->pdd);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 (Cflag != 0) {
|
|
#ifdef HAVE_PCAP_DUMP_FTELL64
|
|
int64_t size = pcap_dump_ftell64(dump_info->pdd);
|
|
#else
|
|
/*
|
|
* XXX - this only handles a Cflag value > 2^31-1 on
|
|
* LP64 platforms; to handle ILP32 (32-bit UN*X and
|
|
* Windows) or LLP64 (64-bit Windows) would require
|
|
* a version of libpcap with pcap_dump_ftell64().
|
|
*/
|
|
long size = pcap_dump_ftell(dump_info->pdd);
|
|
#endif
|
|
|
|
if (size == -1)
|
|
error("ftell fails on output file");
|
|
if (size > Cflag) {
|
|
#ifdef HAVE_CAPSICUM
|
|
FILE *fp;
|
|
int fd;
|
|
#endif
|
|
|
|
/*
|
|
* Close the current file and open a new one.
|
|
*/
|
|
pcap_dump_close(dump_info->pdd);
|
|
|
|
/*
|
|
* Compress the file we just closed, if the user
|
|
* asked for it.
|
|
*/
|
|
if (zflag != NULL)
|
|
compress_savefile(dump_info->CurrentFileName);
|
|
|
|
Cflag_count++;
|
|
if (Wflag > 0) {
|
|
if (Cflag_count >= Wflag)
|
|
Cflag_count = 0;
|
|
}
|
|
if (dump_info->CurrentFileName != NULL)
|
|
free(dump_info->CurrentFileName);
|
|
dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
|
|
if (dump_info->CurrentFileName == NULL)
|
|
error("%s: malloc", __func__);
|
|
MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
|
|
#ifdef HAVE_LIBCAP_NG
|
|
capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
#ifdef HAVE_CAPSICUM
|
|
fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
|
|
O_CREAT | O_WRONLY | O_TRUNC, 0644);
|
|
if (fd < 0) {
|
|
error("unable to open file %s",
|
|
dump_info->CurrentFileName);
|
|
}
|
|
fp = fdopen(fd, "w");
|
|
if (fp == NULL) {
|
|
error("unable to fdopen file %s",
|
|
dump_info->CurrentFileName);
|
|
}
|
|
dump_info->pdd = pcap_dump_fopen(dump_info->pd, fp);
|
|
#else /* !HAVE_CAPSICUM */
|
|
dump_info->pdd = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
|
|
#endif
|
|
#ifdef HAVE_LIBCAP_NG
|
|
capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
|
|
capng_apply(CAPNG_SELECT_BOTH);
|
|
#endif /* HAVE_LIBCAP_NG */
|
|
if (dump_info->pdd == NULL)
|
|
error("%s", pcap_geterr(pd));
|
|
#ifdef HAVE_CAPSICUM
|
|
set_dumper_capsicum_rights(dump_info->pdd);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
pcap_dump((u_char *)dump_info->pdd, h, sp);
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
if (Uflag)
|
|
pcap_dump_flush(dump_info->pdd);
|
|
#endif
|
|
|
|
if (dump_info->ndo != NULL)
|
|
pretty_print_packet(dump_info->ndo, h, sp, packets_captured);
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
static void
|
|
dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
struct dump_info *dump_info;
|
|
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
|
|
dump_info = (struct dump_info *)user;
|
|
|
|
pcap_dump((u_char *)dump_info->pdd, h, sp);
|
|
#ifdef HAVE_PCAP_DUMP_FLUSH
|
|
if (Uflag)
|
|
pcap_dump_flush(dump_info->pdd);
|
|
#endif
|
|
|
|
if (dump_info->ndo != NULL)
|
|
pretty_print_packet(dump_info->ndo, h, sp, packets_captured);
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
static void
|
|
print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
|
++packets_captured;
|
|
|
|
++infodelay;
|
|
|
|
if (!count_mode)
|
|
pretty_print_packet((netdissect_options *)user, h, sp, packets_captured);
|
|
|
|
--infodelay;
|
|
if (infoprint)
|
|
info(0);
|
|
}
|
|
|
|
#ifdef SIGNAL_REQ_INFO
|
|
static void
|
|
requestinfo(int signo _U_)
|
|
{
|
|
if (infodelay)
|
|
++infoprint;
|
|
else
|
|
info(0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SIGNAL_FLUSH_PCAP
|
|
static void
|
|
flushpcap(int signo _U_)
|
|
{
|
|
if (pdd != NULL)
|
|
pcap_dump_flush(pdd);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
print_packets_captured (void)
|
|
{
|
|
static u_int prev_packets_captured, first = 1;
|
|
|
|
if (infodelay == 0 && (first || packets_captured != prev_packets_captured)) {
|
|
fprintf(stderr, "Got %u\r", packets_captured);
|
|
first = 0;
|
|
prev_packets_captured = packets_captured;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called once each second in verbose mode while dumping to file
|
|
*/
|
|
#ifdef _WIN32
|
|
static void CALLBACK verbose_stats_dump(PVOID param _U_,
|
|
BOOLEAN timer_fired _U_)
|
|
{
|
|
print_packets_captured();
|
|
}
|
|
#else /* _WIN32 */
|
|
static void verbose_stats_dump(int sig _U_)
|
|
{
|
|
print_packets_captured();
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
DIAG_OFF_DEPRECATION
|
|
static void
|
|
print_version(FILE *f)
|
|
{
|
|
#ifndef HAVE_PCAP_LIB_VERSION
|
|
#ifdef HAVE_PCAP_VERSION
|
|
extern char pcap_version[];
|
|
#else /* HAVE_PCAP_VERSION */
|
|
static char pcap_version[] = "unknown";
|
|
#endif /* HAVE_PCAP_VERSION */
|
|
#endif /* HAVE_PCAP_LIB_VERSION */
|
|
const char *smi_version_string;
|
|
|
|
(void)fprintf(f, "%s version " PACKAGE_VERSION "\n", program_name);
|
|
#ifdef HAVE_PCAP_LIB_VERSION
|
|
(void)fprintf(f, "%s\n", pcap_lib_version());
|
|
#else /* HAVE_PCAP_LIB_VERSION */
|
|
(void)fprintf(f, "libpcap version %s\n", pcap_version);
|
|
#endif /* HAVE_PCAP_LIB_VERSION */
|
|
|
|
#if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION)
|
|
(void)fprintf (f, "%s\n", SSLeay_version(SSLEAY_VERSION));
|
|
#endif
|
|
|
|
smi_version_string = nd_smi_version_string();
|
|
if (smi_version_string != NULL)
|
|
(void)fprintf (f, "SMI-library: %s\n", smi_version_string);
|
|
|
|
#if defined(__SANITIZE_ADDRESS__)
|
|
(void)fprintf (f, "Compiled with AddressSanitizer/GCC.\n");
|
|
#elif defined(__has_feature)
|
|
# if __has_feature(address_sanitizer)
|
|
(void)fprintf (f, "Compiled with AddressSanitizer/Clang.\n");
|
|
# elif __has_feature(memory_sanitizer)
|
|
(void)fprintf (f, "Compiled with MemorySanitizer/Clang.\n");
|
|
# endif
|
|
#endif /* __SANITIZE_ADDRESS__ or __has_feature */
|
|
}
|
|
DIAG_ON_DEPRECATION
|
|
|
|
static void
|
|
print_usage(FILE *f)
|
|
{
|
|
print_version(f);
|
|
(void)fprintf(f,
|
|
"Usage: %s [-Abd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ] [--count]\n", program_name);
|
|
(void)fprintf(f,
|
|
"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
|
|
(void)fprintf(f,
|
|
"\t\t[ -i interface ]" IMMEDIATE_MODE_USAGE j_FLAG_USAGE "\n");
|
|
#ifdef HAVE_PCAP_FINDALLDEVS_EX
|
|
(void)fprintf(f,
|
|
"\t\t" LIST_REMOTE_INTERFACES_USAGE "\n");
|
|
#endif
|
|
#ifdef USE_LIBSMI
|
|
(void)fprintf(f,
|
|
"\t\t" m_FLAG_USAGE "\n");
|
|
#endif
|
|
(void)fprintf(f,
|
|
"\t\t[ -M secret ] [ --number ] [ --print ]" Q_FLAG_USAGE "\n");
|
|
(void)fprintf(f,
|
|
"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ --version ]\n");
|
|
(void)fprintf(f,
|
|
"\t\t[ -V file ] [ -w file ] [ -W filecount ] [ -y datalinktype ]\n");
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
(void)fprintf(f,
|
|
"\t\t[ --time-stamp-precision precision ] [ --micro ] [ --nano ]\n");
|
|
#endif
|
|
(void)fprintf(f,
|
|
"\t\t[ -z postrotate-command ] [ -Z user ] [ expression ]\n");
|
|
}
|