forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
and the error message includes "Not enough storage is available to process this command" or "The operation completed successfully", suggest that the user install a WinPcap version later than 3.0 - this is definitely a Frequently Asked Question on the Ethereal list. svn path=/trunk/; revision=11143
3368 lines
104 KiB
C
3368 lines
104 KiB
C
/* tethereal.c
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*
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* $Id: tethereal.c,v 1.244 2004/06/12 07:47:13 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Text-mode variant, by Gilbert Ramirez <gram@alumni.rice.edu>
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* and Guy Harris <guy@alum.mit.edu>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* With MSVC and a libethereal.dll this file needs to import some variables
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in a special way. Therefore _NEED_VAR_IMPORT_ is defined. */
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#define _NEED_VAR_IMPORT_
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <locale.h>
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#include <limits.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.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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#include <signal.h>
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#ifdef HAVE_LIBPCAP
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#include <pcap.h>
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#include <setjmp.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#ifdef NEED_STRERROR_H
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#include "strerror.h"
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#endif
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#ifdef NEED_GETOPT_H
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#include "getopt.h"
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#endif
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#include "cvsversion.h"
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#include <glib.h>
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#include <epan/epan.h>
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#include <epan/filesystem.h>
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#include "globals.h"
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#include <epan/timestamp.h>
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#include <epan/packet.h>
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#include "file.h"
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#include "disabled_protos.h"
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#include "prefs.h"
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#include "column.h"
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#include "print.h"
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#include <epan/resolv.h>
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#include "util.h"
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#include "version_info.h"
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#ifdef HAVE_LIBPCAP
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#include "pcap-util.h"
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#endif
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#include <epan/conversation.h>
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#include <epan/plugins.h>
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#include "register.h"
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#include "conditions.h"
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#include "capture_stop_conditions.h"
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#include "ringbuffer.h"
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#include <epan/epan_dissect.h>
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#include "tap.h"
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#include <epan/timestamp.h>
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#ifdef HAVE_LIBPCAP
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#include <wiretap/wtap-capture.h>
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#include <wiretap/libpcap.h>
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#endif
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#ifdef _WIN32
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#include "capture-wpcap.h"
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#endif
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/*
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* This is the template for the decode as option; it is shared between the
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* various functions that output the usage for this parameter.
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*/
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static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
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static guint32 firstsec, firstusec;
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static guint32 prevsec, prevusec;
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static GString *comp_info_str, *runtime_info_str;
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static gboolean quiet;
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static gboolean print_packet_info; /* TRUE if we're to print packet information */
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static gboolean do_dissection; /* TRUE if we have to dissect each packet */
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static gboolean verbose;
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static gboolean print_hex;
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static gboolean line_buffered;
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static guint32 cum_bytes = 0;
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static print_format_e print_format;
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#ifdef HAVE_LIBPCAP
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typedef struct _loop_data {
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gboolean go; /* TRUE as long as we're supposed to keep capturing */
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gint linktype;
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gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
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pcap_t *pch;
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wtap_dumper *pdh;
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jmp_buf stopenv;
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gboolean output_to_pipe;
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int packet_count;
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#ifndef _WIN32
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gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
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gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
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unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
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enum {
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STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
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STATE_EXPECT_DATA, STATE_READ_DATA
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} pipe_state;
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enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
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#endif
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} loop_data;
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static loop_data ld;
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static int capture(int);
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static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
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const guchar *);
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static void report_counts(void);
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#ifdef _WIN32
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static BOOL WINAPI capture_cleanup(DWORD);
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#else /* _WIN32 */
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static void capture_cleanup(int);
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#ifdef SIGINFO
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static void report_counts_siginfo(int);
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#endif /* SIGINFO */
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#endif /* _WIN32 */
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#endif /* HAVE_LIBPCAP */
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static int load_cap_file(capture_file *, int);
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static gboolean process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
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const struct wtap_pkthdr *whdr, union wtap_pseudo_header *pseudo_header,
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const guchar *pd, int *err);
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static void show_capture_file_io_error(const char *, int, gboolean);
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static void show_print_file_io_error(int err);
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static void print_packet(capture_file *cf, epan_dissect_t *edt);
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static char *cf_open_error_message(int err, gchar *err_info,
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gboolean for_writing, int file_type);
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#ifdef HAVE_LIBPCAP
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#ifndef _WIN32
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static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
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static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
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static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
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struct pcaprec_modified_hdr *, guchar *, char *, int);
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#endif /* _WIN32 */
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#endif
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static void open_failure_message(const char *filename, int err,
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gboolean for_writing);
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static void failure_message(const char *msg_format, va_list ap);
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static void read_failure_message(const char *filename, int err);
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capture_file cfile;
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#ifdef HAVE_LIBPCAP
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typedef struct {
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int snaplen; /* Maximum captured packet length */
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int promisc_mode; /* Capture in promiscuous mode */
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int autostop_count; /* Maximum packet count */
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gboolean has_autostop_duration; /* TRUE if maximum capture duration
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is specified */
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gint32 autostop_duration; /* Maximum capture duration */
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gboolean has_autostop_filesize; /* TRUE if maximum capture file size
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is specified */
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gint32 autostop_filesize; /* Maximum capture file size */
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gboolean ringbuffer_on; /* TRUE if ring buffer in use */
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guint32 ringbuffer_num_files; /* Number of ring buffer files */
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gboolean has_ring_duration; /* TRUE if ring duration specified */
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gint32 ringbuffer_duration; /* Switch file after n seconds */
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int linktype; /* Data link type to use, or -1 for
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"use default" */
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} capture_options;
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static capture_options capture_opts = {
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WTAP_MAX_PACKET_SIZE, /* snapshot length - default is
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infinite, in effect */
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TRUE, /* promiscuous mode is the default */
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0, /* max packet count - default is 0,
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meaning infinite */
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FALSE, /* maximum capture duration not
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specified by default */
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0, /* maximum capture duration */
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FALSE, /* maximum capture file size not
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specified by default */
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0, /* maximum capture file size */
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FALSE, /* ring buffer off by default */
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RINGBUFFER_MIN_NUM_FILES, /* default number of ring buffer
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files */
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FALSE, /* Switch ring file after some */
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0, /* specified time is off by default */
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-1 /* Default to not change link type */
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};
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static gboolean list_link_layer_types;
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#ifdef SIGINFO
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static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
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static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
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#endif /* SIGINFO */
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#endif /* HAVE_LIBPCAP */
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static void
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print_usage(gboolean print_ver)
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{
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int i;
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FILE *output;
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if (print_ver) {
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output = stdout;
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fprintf(output, "This is GNU t" PACKAGE " " VERSION
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#ifdef CVSVERSION
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" (" CVSVERSION ")"
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#endif
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"\n (C) 1998-2004 Gerald Combs <gerald@ethereal.com>"
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"\n%s\n%s\n",
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comp_info_str->str, runtime_info_str->str);
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} else {
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output = stderr;
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}
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#ifdef HAVE_LIBPCAP
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fprintf(output, "\nt%s [ -vh ] [ -DlLnpqSVx ] [ -a <capture autostop condition> ] ...\n",
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PACKAGE);
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fprintf(output, "\t[ -b <number of ring buffer files>[:<duration>] ] [ -c <count> ]\n");
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fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
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fprintf(output, "\t[ -f <capture filter> ] [ -F <output file type> ] [ -i <interface> ]\n");
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fprintf(output, "\t[ -N <resolving> ] [ -o <preference setting> ] ... [ -r <infile> ]\n");
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fprintf(output, "\t[ -R <read filter> ] [ -s <snaplen> ] [ -t <time stamp format> ]\n");
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fprintf(output, "\t[ -T pdml|ps|text ] [ -w <savefile> ] [ -y <link type> ]\n");
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fprintf(output, "\t[ -z <statistics string> ]\n");
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#else
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fprintf(output, "\nt%s [ -vh ] [ -lnVx ]\n", PACKAGE);
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fprintf(output, "\t[ -d %s ] ...\n", decode_as_arg_template);
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fprintf(output, "\t[ -F <output file type> ] [ -N <resolving> ]\n");
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fprintf(output, "\t[ -o <preference setting> ] ... [ -r <infile> ] [ -R <read filter> ]\n");
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fprintf(output, "\t[ -t <time stamp format> ] [ -T pdml|ps|text ] [ -w <savefile> ]\n");
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fprintf(output, "\t[ -z <statistics string> ]\n");
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#endif
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fprintf(output, "Valid file type arguments to the \"-F\" flag:\n");
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for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
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if (wtap_dump_can_open(i))
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fprintf(output, "\t%s - %s\n",
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wtap_file_type_short_string(i), wtap_file_type_string(i));
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}
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fprintf(output, "\tdefault is libpcap\n");
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}
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#ifdef HAVE_LIBPCAP
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static int
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get_natural_int(const char *string, const char *name)
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{
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long number;
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char *p;
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number = strtol(string, &p, 10);
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if (p == string || *p != '\0') {
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fprintf(stderr, "tethereal: The specified %s \"%s\" is not a decimal number\n",
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name, string);
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exit(1);
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}
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if (number < 0) {
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fprintf(stderr, "tethereal: The specified %s is a negative number\n",
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name);
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exit(1);
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}
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if (number > INT_MAX) {
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fprintf(stderr, "tethereal: The specified %s is too large (greater than %d)\n",
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name, INT_MAX);
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exit(1);
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}
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return number;
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}
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static int
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get_positive_int(const char *string, const char *name)
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{
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long number;
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number = get_natural_int(string, name);
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if (number == 0) {
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fprintf(stderr, "tethereal: The specified %s is zero\n",
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name);
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exit(1);
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}
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return number;
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}
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/*
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* Given a string of the form "<autostop criterion>:<value>", as might appear
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* as an argument to a "-a" option, parse it and set the criterion in
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* question. Return an indication of whether it succeeded or failed
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* in some fashion.
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*/
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static gboolean
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set_autostop_criterion(const char *autostoparg)
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{
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guchar *p, *colonp;
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colonp = strchr(autostoparg, ':');
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if (colonp == NULL)
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return FALSE;
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p = colonp;
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*p++ = '\0';
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/*
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* Skip over any white space (there probably won't be any, but
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* as we allow it in the preferences file, we might as well
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* allow it here).
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*/
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while (isspace(*p))
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p++;
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if (*p == '\0') {
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/*
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* Put the colon back, so if our caller uses, in an
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* error message, the string they passed us, the message
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* looks correct.
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*/
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*colonp = ':';
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return FALSE;
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}
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if (strcmp(autostoparg,"duration") == 0) {
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capture_opts.has_autostop_duration = TRUE;
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capture_opts.autostop_duration = get_positive_int(p,"autostop duration");
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} else if (strcmp(autostoparg,"filesize") == 0) {
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capture_opts.has_autostop_filesize = TRUE;
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capture_opts.autostop_filesize = get_positive_int(p,"autostop filesize");
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} else {
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return FALSE;
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}
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*colonp = ':'; /* put the colon back */
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return TRUE;
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}
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/*
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* Given a string of the form "<ring buffer file>:<duration>", as might appear
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* as an argument to a "-b" option, parse it and set the arguments in
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* question. Return an indication of whether it succeeded or failed
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* in some fashion.
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*/
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static gboolean
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get_ring_arguments(const char *arg)
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{
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guchar *p = NULL, *colonp;
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colonp = strchr(arg, ':');
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if (colonp != NULL) {
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p = colonp;
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*p++ = '\0';
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}
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capture_opts.ringbuffer_num_files =
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get_natural_int(arg, "number of ring buffer files");
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if (colonp == NULL)
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return TRUE;
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/*
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* Skip over any white space (there probably won't be any, but
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* as we allow it in the preferences file, we might as well
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* allow it here).
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*/
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while (isspace(*p))
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p++;
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if (*p == '\0') {
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/*
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* Put the colon back, so if our caller uses, in an
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* error message, the string they passed us, the message
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* looks correct.
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*/
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*colonp = ':';
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return FALSE;
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}
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capture_opts.has_ring_duration = TRUE;
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capture_opts.ringbuffer_duration = get_positive_int(p,
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"ring buffer duration");
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*colonp = ':'; /* put the colon back */
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return TRUE;
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}
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#endif
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/* structure to keep track of what tap listeners have been registered.
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*/
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typedef struct _ethereal_tap_list {
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struct _ethereal_tap_list *next;
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char *cmd;
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void (*func)(char *arg);
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} ethereal_tap_list;
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static ethereal_tap_list *tap_list=NULL;
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void
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register_ethereal_tap(char *cmd, void (*func)(char *arg))
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{
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ethereal_tap_list *newtl;
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newtl=malloc(sizeof(ethereal_tap_list));
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newtl->next=tap_list;
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tap_list=newtl;
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newtl->cmd=cmd;
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newtl->func=func;
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}
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/*
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* For a dissector table, print on the stream described by output,
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* its short name (which is what's used in the "-d" option) and its
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* descriptive name.
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*/
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static void
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display_dissector_table_names(char *table_name, char *ui_name, gpointer output)
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{
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fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
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}
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/*
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* For a dissector handle, print on the stream described by output,
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* the filter name (which is what's used in the "-d" option) and the full
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* name for the protocol that corresponds to this handle.
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*/
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static void
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display_dissector_names(gchar *table _U_, gpointer handle, gpointer output)
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{
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int proto_id;
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const gchar* proto_filter_name;
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const gchar* proto_ui_name;
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proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
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if (proto_id != -1) {
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proto_filter_name = proto_get_protocol_filter_name(proto_id);
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proto_ui_name = proto_get_protocol_name(proto_id);
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g_assert(proto_filter_name != NULL);
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g_assert(proto_ui_name != NULL);
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fprintf((FILE *)output, "\t%s (%s)\n",
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proto_filter_name,
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proto_ui_name);
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}
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}
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/*
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* The protocol_name_search structure is used by find_protocol_name_func()
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* to pass parameters and store results
|
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*/
|
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struct protocol_name_search{
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gchar *searched_name; /* Protocol filter name we are looking for */
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dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
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guint nb_match; /* How many dissectors matched searched_name */
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};
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typedef struct protocol_name_search *protocol_name_search_t;
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|
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/*
|
|
* This function parses all dissectors associated with a table to find the
|
|
* one whose protocol has the specified filter name. It is called
|
|
* as a reference function in a call to dissector_table_foreach_handle.
|
|
* The name we are looking for, as well as the results, are stored in the
|
|
* protocol_name_search struct pointed to by user_data.
|
|
* If called using dissector_table_foreach_handle, we actually parse the
|
|
* whole list of dissectors.
|
|
*/
|
|
static void
|
|
find_protocol_name_func(gchar *table _U_, gpointer handle, gpointer user_data)
|
|
|
|
{
|
|
int proto_id;
|
|
const gchar *protocol_filter_name;
|
|
protocol_name_search_t search_info;
|
|
|
|
g_assert(handle);
|
|
|
|
search_info = (protocol_name_search_t)user_data;
|
|
|
|
proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
|
|
if (proto_id != -1) {
|
|
protocol_filter_name = proto_get_protocol_filter_name(proto_id);
|
|
g_assert(protocol_filter_name != NULL);
|
|
if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
|
|
/* Found a match */
|
|
if (search_info->nb_match == 0) {
|
|
/* Record this handle only if this is the first match */
|
|
search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
|
|
}
|
|
search_info->nb_match++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Print all layer type names supported.
|
|
* We send the output to the stream described by the handle output.
|
|
*/
|
|
|
|
static void
|
|
fprint_all_layer_types(FILE *output)
|
|
|
|
{
|
|
dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output);
|
|
}
|
|
|
|
/*
|
|
* Print all protocol names supported for a specific layer type.
|
|
* table_name contains the layer type name in which the search is performed.
|
|
* We send the output to the stream described by the handle output.
|
|
*/
|
|
|
|
static void
|
|
fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
|
|
|
|
{
|
|
dissector_table_foreach_handle(table_name,
|
|
display_dissector_names,
|
|
(gpointer)output);
|
|
}
|
|
|
|
/*
|
|
* The function below parses the command-line parameters for the decode as
|
|
* feature (a string pointer by cl_param).
|
|
* It checks the format of the command-line, searches for a matching table
|
|
* and dissector. If a table/dissector match is not found, we display a
|
|
* summary of the available tables/dissectors (on stderr) and return FALSE.
|
|
* If everything is fine, we get the "Decode as" preference activated,
|
|
* then we return TRUE.
|
|
*/
|
|
static gboolean
|
|
add_decode_as(const gchar *cl_param)
|
|
{
|
|
gchar *table_name;
|
|
guint32 selector;
|
|
gchar *decoded_param;
|
|
gchar *remaining_param;
|
|
gchar *selector_str;
|
|
gchar *dissector_str;
|
|
dissector_handle_t dissector_matching;
|
|
dissector_table_t table_matching;
|
|
ftenum_t dissector_table_selector_type;
|
|
struct protocol_name_search user_protocol_name;
|
|
|
|
/* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
|
|
|
|
g_assert(cl_param);
|
|
decoded_param = g_malloc( sizeof(gchar) * (strlen(cl_param) + 1) ); /* Allocate enough space to have a working copy of the command-line parameter */
|
|
g_assert(decoded_param);
|
|
strcpy(decoded_param, cl_param);
|
|
|
|
|
|
/* The lines below will parse this string (modifying it) to extract all
|
|
necessary information. Note that decoded_param is still needed since
|
|
strings are not copied - we just save pointers. */
|
|
|
|
/* This section extracts a layer type (table_name) from decoded_param */
|
|
table_name = decoded_param; /* Layer type string starts from beginning */
|
|
|
|
remaining_param = strchr(table_name, '=');
|
|
if (remaining_param == NULL) {
|
|
fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
|
|
/* If the argument does not follow the template, carry on anyway to check
|
|
if the table name is at least correct. If remaining_param is NULL,
|
|
we'll exit anyway further down */
|
|
}
|
|
else {
|
|
*remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
|
|
}
|
|
|
|
/* Remove leading and trailing spaces from the table name */
|
|
while ( table_name[0] == ' ' )
|
|
table_name++;
|
|
while ( table_name[strlen(table_name) - 1] == ' ' )
|
|
table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
|
|
|
|
/* The following part searches a table matching with the layer type specified */
|
|
table_matching = NULL;
|
|
|
|
/* Look for the requested table */
|
|
if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
|
|
fprintf(stderr, "tethereal: No layer type specified\n"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
|
|
}
|
|
else {
|
|
table_matching = find_dissector_table(table_name);
|
|
if (!table_matching) {
|
|
fprintf(stderr, "tethereal: Unknown layer type -- %s\n", table_name); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
|
|
}
|
|
}
|
|
|
|
if (!table_matching) {
|
|
/* Display a list of supported layer types to help the user, if the
|
|
specified layer type was not found */
|
|
fprintf(stderr, "tethereal: Valid layer types are:\n");
|
|
fprint_all_layer_types(stderr);
|
|
}
|
|
if (remaining_param == NULL || !table_matching) {
|
|
/* Exit if the layer type was not found, or if no '=' separator was found
|
|
(see above) */
|
|
g_free(decoded_param);
|
|
return FALSE;
|
|
}
|
|
|
|
if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
|
|
fprintf(stderr, "tethereal: WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"\n", table_name, remaining_param + 1);
|
|
}
|
|
else {
|
|
remaining_param++; /* Move to the second '=' */
|
|
*remaining_param = '\0'; /* Remove the second '=' */
|
|
}
|
|
remaining_param++; /* Position after the layer type string */
|
|
|
|
/* This section extracts a selector value (selector_str) from decoded_param */
|
|
|
|
selector_str = remaining_param; /* Next part starts with the selector number */
|
|
|
|
remaining_param = strchr(selector_str, ',');
|
|
if (remaining_param == NULL) {
|
|
fprintf(stderr, "tethereal: Parameter \"%s\" doesn't follow the template \"%s\"\n", cl_param, decode_as_arg_template);
|
|
/* If the argument does not follow the template, carry on anyway to check
|
|
if the selector value is at least correct. If remaining_param is NULL,
|
|
we'll exit anyway further down */
|
|
}
|
|
else {
|
|
*remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
|
|
}
|
|
|
|
dissector_table_selector_type = get_dissector_table_selector_type(table_name);
|
|
|
|
switch (dissector_table_selector_type) {
|
|
|
|
case FT_UINT8:
|
|
case FT_UINT16:
|
|
case FT_UINT24:
|
|
case FT_UINT32:
|
|
/* The selector for this table is an unsigned number. Parse it as such.
|
|
There's no need to remove leading and trailing spaces from the
|
|
selector number string, because sscanf will do that for us. */
|
|
if ( sscanf(selector_str, "%u", &selector) != 1 ) {
|
|
fprintf(stderr, "tethereal: Invalid selector number \"%s\"\n", selector_str);
|
|
g_free(decoded_param);
|
|
return FALSE;
|
|
}
|
|
break;
|
|
|
|
case FT_STRING:
|
|
case FT_STRINGZ:
|
|
/* The selector for this table is a string. */
|
|
break;
|
|
|
|
default:
|
|
/* There are currently no dissector tables with any types other
|
|
than the ones listed above. */
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
if (remaining_param == NULL) {
|
|
/* Exit if no ',' separator was found (see above) */
|
|
fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
|
|
fprint_all_protocols_for_layer_types(stderr, table_name);
|
|
g_free(decoded_param);
|
|
return FALSE;
|
|
}
|
|
|
|
remaining_param++; /* Position after the selector number string */
|
|
|
|
/* This section extracts a protocol filter name (dissector_str) from decoded_param */
|
|
|
|
dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
|
|
|
|
/* Remove leading and trailing spaces from the dissector name */
|
|
while ( dissector_str[0] == ' ' )
|
|
dissector_str++;
|
|
while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
|
|
dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
|
|
|
|
dissector_matching = NULL;
|
|
|
|
/* We now have a pointer to the handle for the requested table inside the variable table_matching */
|
|
if ( ! (*dissector_str) ) { /* Is the dissector name empty, if so, don't even search for a matching dissector and display all dissectors found for the selected table */
|
|
fprintf(stderr, "tethereal: No protocol name specified\n"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
|
|
}
|
|
else {
|
|
user_protocol_name.nb_match = 0;
|
|
user_protocol_name.searched_name = dissector_str;
|
|
user_protocol_name.matched_handle = NULL;
|
|
|
|
dissector_table_foreach_handle(table_name, find_protocol_name_func, &user_protocol_name); /* Go and perform the search for this dissector in the this table's dissectors' names and shortnames */
|
|
|
|
if (user_protocol_name.nb_match != 0) {
|
|
dissector_matching = user_protocol_name.matched_handle;
|
|
if (user_protocol_name.nb_match > 1) {
|
|
fprintf(stderr, "tethereal: WARNING: Protocol \"%s\" matched %u dissectors, first one will be used\n", dissector_str, user_protocol_name.nb_match);
|
|
}
|
|
}
|
|
else {
|
|
/* OK, check whether the problem is that there isn't any such
|
|
protocol, or that there is but it's not specified as a protocol
|
|
that's valid for that dissector table.
|
|
Note, we don't exit here, but dissector_matching will remain NULL,
|
|
so we exit below */
|
|
if (proto_get_id_by_filter_name(dissector_str) == -1) {
|
|
/* No such protocol */
|
|
fprintf(stderr, "tethereal: Unknown protocol -- \"%s\"\n", dissector_str);
|
|
} else {
|
|
fprintf(stderr, "tethereal: Protocol \"%s\" isn't valid for layer type \"%s\"\n",
|
|
dissector_str, table_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!dissector_matching) {
|
|
fprintf(stderr, "tethereal: Valid protocols for layer type \"%s\" are:\n", table_name);
|
|
fprint_all_protocols_for_layer_types(stderr, table_name);
|
|
g_free(decoded_param);
|
|
return FALSE;
|
|
}
|
|
|
|
/* This is the end of the code that parses the command-line options.
|
|
All information is now stored in the variables:
|
|
table_name
|
|
selector
|
|
dissector_matching
|
|
The above variables that are strings are still pointing to areas within
|
|
decoded_parm. decoded_parm thus still needs to be kept allocated in
|
|
until we stop needing these variables
|
|
decoded_param will be deallocated at each exit point of this function */
|
|
|
|
|
|
/* We now have a pointer to the handle for the requested dissector
|
|
(requested protocol) inside the variable dissector_matching */
|
|
switch (dissector_table_selector_type) {
|
|
|
|
case FT_UINT8:
|
|
case FT_UINT16:
|
|
case FT_UINT24:
|
|
case FT_UINT32:
|
|
/* The selector for this table is an unsigned number. */
|
|
dissector_change(table_name, selector, dissector_matching);
|
|
break;
|
|
|
|
case FT_STRING:
|
|
case FT_STRINGZ:
|
|
/* The selector for this table is a string. */
|
|
dissector_change_string(table_name, selector_str, dissector_matching);
|
|
break;
|
|
|
|
default:
|
|
/* There are currently no dissector tables with any types other
|
|
than the ones listed above. */
|
|
g_assert_not_reached();
|
|
}
|
|
g_free(decoded_param); /* "Decode As" rule has been succesfully added */
|
|
return TRUE;
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int opt, i;
|
|
extern char *optarg;
|
|
gboolean arg_error = FALSE;
|
|
|
|
#ifdef _WIN32
|
|
WSADATA wsaData;
|
|
#endif /* _WIN32 */
|
|
|
|
char *gpf_path, *pf_path;
|
|
char *gdp_path, *dp_path;
|
|
int gpf_open_errno, gpf_read_errno;
|
|
int pf_open_errno, pf_read_errno;
|
|
int gdp_open_errno, gdp_read_errno;
|
|
int dp_open_errno, dp_read_errno;
|
|
int err;
|
|
#ifdef HAVE_LIBPCAP
|
|
gboolean capture_filter_specified = FALSE;
|
|
GList *if_list, *if_entry;
|
|
if_info_t *if_info;
|
|
long adapter_index;
|
|
char *p;
|
|
gchar err_str[PCAP_ERRBUF_SIZE];
|
|
gchar *cant_get_if_list_errstr;
|
|
#else
|
|
gboolean capture_option_specified = FALSE;
|
|
#endif
|
|
int out_file_type = WTAP_FILE_PCAP;
|
|
gchar *cf_name = NULL, *rfilter = NULL;
|
|
#ifdef HAVE_LIBPCAP
|
|
gchar *if_text;
|
|
GList *lt_list, *lt_entry;
|
|
data_link_info_t *data_link_info;
|
|
#endif
|
|
#ifdef HAVE_PCAP_OPEN_DEAD
|
|
struct bpf_program fcode;
|
|
#endif
|
|
dfilter_t *rfcode = NULL;
|
|
e_prefs *prefs;
|
|
char badopt;
|
|
ethereal_tap_list *tli;
|
|
|
|
set_timestamp_setting(TS_RELATIVE);
|
|
|
|
/* Register all dissectors; we must do this before checking for the
|
|
"-G" flag, as the "-G" flag dumps information registered by the
|
|
dissectors, and we must do it before we read the preferences, in
|
|
case any dissectors register preferences. */
|
|
epan_init(PLUGIN_DIR,register_all_protocols,register_all_protocol_handoffs,
|
|
failure_message,open_failure_message,read_failure_message);
|
|
|
|
/* Register all tap listeners; we do this before we parse the arguments,
|
|
as the "-z" argument can specify a registered tap. */
|
|
register_all_tap_listeners();
|
|
|
|
/* Now register the preferences for any non-dissector modules.
|
|
We must do that before we read the preferences as well. */
|
|
prefs_register_modules();
|
|
|
|
/* If invoked with the "-G" flag, we dump out information based on
|
|
the argument to the "-G" flag; if no argument is specified,
|
|
for backwards compatibility we dump out a glossary of display
|
|
filter symbols.
|
|
|
|
We do this here to mirror what happens in the GTK+ version, although
|
|
it's not necessary here. */
|
|
if (argc >= 2 && strcmp(argv[1], "-G") == 0) {
|
|
if (argc == 2)
|
|
proto_registrar_dump_fields();
|
|
else {
|
|
if (strcmp(argv[2], "fields") == 0)
|
|
proto_registrar_dump_fields();
|
|
else if (strcmp(argv[2], "protocols") == 0)
|
|
proto_registrar_dump_protocols();
|
|
else {
|
|
fprintf(stderr, "tethereal: Invalid \"%s\" option for -G flag\n",
|
|
argv[2]);
|
|
exit(1);
|
|
}
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* Set the C-language locale to the native environment. */
|
|
setlocale(LC_ALL, "");
|
|
|
|
prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
|
|
&pf_open_errno, &pf_read_errno, &pf_path);
|
|
if (gpf_path != NULL) {
|
|
if (gpf_open_errno != 0) {
|
|
fprintf(stderr, "Can't open global preferences file \"%s\": %s.\n",
|
|
pf_path, strerror(gpf_open_errno));
|
|
}
|
|
if (gpf_read_errno != 0) {
|
|
fprintf(stderr, "I/O error reading global preferences file \"%s\": %s.\n",
|
|
pf_path, strerror(gpf_read_errno));
|
|
}
|
|
}
|
|
if (pf_path != NULL) {
|
|
if (pf_open_errno != 0) {
|
|
fprintf(stderr, "Can't open your preferences file \"%s\": %s.\n", pf_path,
|
|
strerror(pf_open_errno));
|
|
}
|
|
if (pf_read_errno != 0) {
|
|
fprintf(stderr, "I/O error reading your preferences file \"%s\": %s.\n",
|
|
pf_path, strerror(pf_read_errno));
|
|
}
|
|
g_free(pf_path);
|
|
pf_path = NULL;
|
|
}
|
|
|
|
/* Set the name resolution code's flags from the preferences. */
|
|
g_resolv_flags = prefs->name_resolve;
|
|
|
|
/* Read the disabled protocols file. */
|
|
read_disabled_protos_list(&gdp_path, &gdp_open_errno, &gdp_read_errno,
|
|
&dp_path, &dp_open_errno, &dp_read_errno);
|
|
if (gdp_path != NULL) {
|
|
if (gdp_open_errno != 0) {
|
|
fprintf(stderr,
|
|
"Could not open global disabled protocols file\n\"%s\": %s.\n",
|
|
gdp_path, strerror(gdp_open_errno));
|
|
}
|
|
if (gdp_read_errno != 0) {
|
|
fprintf(stderr,
|
|
"I/O error reading global disabled protocols file\n\"%s\": %s.\n",
|
|
gdp_path, strerror(gdp_read_errno));
|
|
}
|
|
g_free(gdp_path);
|
|
}
|
|
if (dp_path != NULL) {
|
|
if (dp_open_errno != 0) {
|
|
fprintf(stderr,
|
|
"Could not open your disabled protocols file\n\"%s\": %s.\n", dp_path,
|
|
strerror(dp_open_errno));
|
|
}
|
|
if (dp_read_errno != 0) {
|
|
fprintf(stderr,
|
|
"I/O error reading your disabled protocols file\n\"%s\": %s.\n", dp_path,
|
|
strerror(dp_read_errno));
|
|
}
|
|
g_free(dp_path);
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
/* Load Wpcap, if possible */
|
|
load_wpcap();
|
|
#endif
|
|
|
|
init_cap_file(&cfile);
|
|
|
|
/* Assemble the compile-time version information string */
|
|
comp_info_str = g_string_new("Compiled ");
|
|
get_compiled_version_info(comp_info_str);
|
|
|
|
/* Assemble the run-time version information string */
|
|
runtime_info_str = g_string_new("Running ");
|
|
get_runtime_version_info(runtime_info_str);
|
|
|
|
/* Print format defaults to this. */
|
|
print_format = PR_FMT_TEXT;
|
|
|
|
/* Now get our args */
|
|
while ((opt = getopt(argc, argv, "a:b:c:d:Df:F:hi:lLnN:o:pqr:R:s:St:T:vw:Vxy:z:")) != -1) {
|
|
switch (opt) {
|
|
case 'a': /* autostop criteria */
|
|
#ifdef HAVE_LIBPCAP
|
|
if (set_autostop_criterion(optarg) == FALSE) {
|
|
fprintf(stderr, "tethereal: Invalid or unknown -a flag \"%s\"\n", optarg);
|
|
exit(1);
|
|
}
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'b': /* Ringbuffer option */
|
|
#ifdef HAVE_LIBPCAP
|
|
capture_opts.ringbuffer_on = TRUE;
|
|
if (get_ring_arguments(optarg) == FALSE) {
|
|
fprintf(stderr, "tethereal: Invalid or unknown -b arg \"%s\"\n", optarg);
|
|
exit(1);
|
|
}
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'c': /* Capture xxx packets */
|
|
#ifdef HAVE_LIBPCAP
|
|
capture_opts.autostop_count =
|
|
get_positive_int(optarg, "packet count");
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'd': /* Decode as rule */
|
|
if (!add_decode_as(optarg))
|
|
exit(1);
|
|
break;
|
|
case 'D': /* Print a list of capture devices */
|
|
#ifdef HAVE_LIBPCAP
|
|
if_list = get_interface_list(&err, err_str);
|
|
if (if_list == NULL) {
|
|
switch (err) {
|
|
|
|
case CANT_GET_INTERFACE_LIST:
|
|
cant_get_if_list_errstr =
|
|
cant_get_if_list_error_message(err_str);
|
|
fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
|
|
g_free(cant_get_if_list_errstr);
|
|
break;
|
|
|
|
case NO_INTERFACES_FOUND:
|
|
fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
|
|
break;
|
|
}
|
|
exit(2);
|
|
}
|
|
i = 1; /* Interface id number */
|
|
for (if_entry = g_list_first(if_list); if_entry != NULL;
|
|
if_entry = g_list_next(if_entry)) {
|
|
if_info = if_entry->data;
|
|
printf("%d. %s", i++, if_info->name);
|
|
if (if_info->description != NULL)
|
|
printf(" (%s)", if_info->description);
|
|
printf("\n");
|
|
}
|
|
free_interface_list(if_list);
|
|
exit(0);
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'f':
|
|
#ifdef HAVE_LIBPCAP
|
|
capture_filter_specified = TRUE;
|
|
if (cfile.cfilter)
|
|
g_free(cfile.cfilter);
|
|
cfile.cfilter = g_strdup(optarg);
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'F':
|
|
out_file_type = wtap_short_string_to_file_type(optarg);
|
|
if (out_file_type < 0) {
|
|
fprintf(stderr, "tethereal: \"%s\" is not a valid capture file type\n",
|
|
optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'h': /* Print help and exit */
|
|
print_usage(TRUE);
|
|
exit(0);
|
|
break;
|
|
case 'i': /* Use interface xxx */
|
|
#ifdef HAVE_LIBPCAP
|
|
/*
|
|
* If the argument is a number, treat it as an index into the list
|
|
* of adapters, as printed by "tethereal -D".
|
|
*
|
|
* This should be OK on UNIX systems, as interfaces shouldn't have
|
|
* names that begin with digits. It can be useful on Windows, where
|
|
* more than one interface can have the same name.
|
|
*/
|
|
adapter_index = strtol(optarg, &p, 10);
|
|
if (p != NULL && *p == '\0') {
|
|
if (adapter_index < 0) {
|
|
fprintf(stderr,
|
|
"tethereal: The specified adapter index is a negative number\n");
|
|
exit(1);
|
|
}
|
|
if (adapter_index > INT_MAX) {
|
|
fprintf(stderr,
|
|
"tethereal: The specified adapter index is too large (greater than %d)\n",
|
|
INT_MAX);
|
|
exit(1);
|
|
}
|
|
if (adapter_index == 0) {
|
|
fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
|
|
exit(1);
|
|
}
|
|
if_list = get_interface_list(&err, err_str);
|
|
if (if_list == NULL) {
|
|
switch (err) {
|
|
|
|
case CANT_GET_INTERFACE_LIST:
|
|
cant_get_if_list_errstr =
|
|
cant_get_if_list_error_message(err_str);
|
|
fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
|
|
g_free(cant_get_if_list_errstr);
|
|
break;
|
|
|
|
case NO_INTERFACES_FOUND:
|
|
fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
|
|
break;
|
|
}
|
|
exit(2);
|
|
}
|
|
if_info = g_list_nth_data(if_list, adapter_index - 1);
|
|
if (if_info == NULL) {
|
|
fprintf(stderr, "tethereal: there is no interface with that adapter index\n");
|
|
exit(1);
|
|
}
|
|
cfile.iface = g_strdup(if_info->name);
|
|
free_interface_list(if_list);
|
|
} else
|
|
cfile.iface = g_strdup(optarg);
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'l': /* "Line-buffer" standard output */
|
|
/* This isn't line-buffering, strictly speaking, it's just
|
|
flushing the standard output after the information for
|
|
each packet is printed; however, that should be good
|
|
enough for all the purposes to which "-l" is put (and
|
|
is probably actually better for "-V", as it does fewer
|
|
writes).
|
|
|
|
See the comment in "print_packet()" for an explanation of
|
|
why we do that, and why we don't just use "setvbuf()" to
|
|
make the standard output line-buffered (short version: in
|
|
Windows, "line-buffered" is the same as "fully-buffered",
|
|
and the output buffer is only flushed when it fills up). */
|
|
line_buffered = TRUE;
|
|
break;
|
|
case 'L': /* Print list of link-layer types and exit */
|
|
#ifdef HAVE_LIBPCAP
|
|
list_link_layer_types = TRUE;
|
|
break;
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'n': /* No name resolution */
|
|
g_resolv_flags = RESOLV_NONE;
|
|
break;
|
|
case 'N': /* Select what types of addresses/port #s to resolve */
|
|
if (g_resolv_flags == RESOLV_ALL)
|
|
g_resolv_flags = RESOLV_NONE;
|
|
badopt = string_to_name_resolve(optarg, &g_resolv_flags);
|
|
if (badopt != '\0') {
|
|
fprintf(stderr, "tethereal: -N specifies unknown resolving option '%c'; valid options are 'm', 'n', and 't'\n",
|
|
badopt);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'o': /* Override preference from command line */
|
|
switch (prefs_set_pref(optarg)) {
|
|
|
|
case PREFS_SET_SYNTAX_ERR:
|
|
fprintf(stderr, "tethereal: Invalid -o flag \"%s\"\n", optarg);
|
|
exit(1);
|
|
break;
|
|
|
|
case PREFS_SET_NO_SUCH_PREF:
|
|
case PREFS_SET_OBSOLETE:
|
|
fprintf(stderr, "tethereal: -o flag \"%s\" specifies unknown preference\n",
|
|
optarg);
|
|
exit(1);
|
|
break;
|
|
}
|
|
break;
|
|
case 'p': /* Don't capture in promiscuous mode */
|
|
#ifdef HAVE_LIBPCAP
|
|
capture_opts.promisc_mode = FALSE;
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'q': /* Quiet */
|
|
quiet = TRUE;
|
|
break;
|
|
case 'r': /* Read capture file xxx */
|
|
cf_name = g_strdup(optarg);
|
|
break;
|
|
case 'R': /* Read file filter */
|
|
rfilter = optarg;
|
|
break;
|
|
case 's': /* Set the snapshot (capture) length */
|
|
#ifdef HAVE_LIBPCAP
|
|
capture_opts.snaplen = get_positive_int(optarg, "snapshot length");
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'S': /* show packets in real time */
|
|
print_packet_info = TRUE;
|
|
break;
|
|
case 't': /* Time stamp type */
|
|
if (strcmp(optarg, "r") == 0)
|
|
set_timestamp_setting(TS_RELATIVE);
|
|
else if (strcmp(optarg, "a") == 0)
|
|
set_timestamp_setting(TS_ABSOLUTE);
|
|
else if (strcmp(optarg, "ad") == 0)
|
|
set_timestamp_setting(TS_ABSOLUTE_WITH_DATE);
|
|
else if (strcmp(optarg, "d") == 0)
|
|
set_timestamp_setting(TS_DELTA);
|
|
else {
|
|
fprintf(stderr, "tethereal: Invalid time stamp type \"%s\"\n",
|
|
optarg);
|
|
fprintf(stderr, "It must be \"r\" for relative, \"a\" for absolute,\n");
|
|
fprintf(stderr, "\"ad\" for absolute with date, or \"d\" for delta.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'T': /* printing Type */
|
|
if (strcmp(optarg, "text") == 0)
|
|
print_format = PR_FMT_TEXT;
|
|
else if (strcmp(optarg, "pdml") == 0)
|
|
print_format = PR_FMT_PDML;
|
|
else if (strcmp(optarg, "ps") == 0)
|
|
print_format = PR_FMT_PS;
|
|
else {
|
|
fprintf(stderr, "tethereal: Invalid -T parameter.\n");
|
|
fprintf(stderr, "It must be \"ps\", \"text\" or \"pdml\".\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'v': /* Show version and exit */
|
|
printf("t" PACKAGE " " VERSION
|
|
#ifdef CVSVERSION
|
|
" (" CVSVERSION ")"
|
|
#endif
|
|
"\n%s\n%s\n",
|
|
comp_info_str->str, runtime_info_str->str);
|
|
exit(0);
|
|
break;
|
|
case 'w': /* Write to capture file xxx */
|
|
cfile.save_file = g_strdup(optarg);
|
|
break;
|
|
case 'V': /* Verbose */
|
|
verbose = TRUE;
|
|
break;
|
|
case 'x': /* Print packet data in hex (and ASCII) */
|
|
print_hex = TRUE;
|
|
break;
|
|
case 'y': /* Set the pcap data link type */
|
|
#ifdef HAVE_LIBPCAP
|
|
#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
|
|
capture_opts.linktype = pcap_datalink_name_to_val(optarg);
|
|
if (capture_opts.linktype == -1) {
|
|
fprintf(stderr, "tethereal: The specified data link type \"%s\" is not valid\n",
|
|
optarg);
|
|
exit(1);
|
|
}
|
|
#else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
|
|
/* XXX - just treat it as a number */
|
|
capture_opts.linktype = get_natural_int(optarg, "data link type");
|
|
#endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
arg_error = TRUE;
|
|
#endif
|
|
break;
|
|
case 'z':
|
|
for(tli=tap_list;tli;tli=tli->next){
|
|
if(!strncmp(tli->cmd,optarg,strlen(tli->cmd))){
|
|
(*tli->func)(optarg);
|
|
break;
|
|
}
|
|
}
|
|
if(!tli){
|
|
fprintf(stderr,"tethereal: invalid -z argument.\n");
|
|
fprintf(stderr," -z argument must be one of :\n");
|
|
for(tli=tap_list;tli;tli=tli->next){
|
|
fprintf(stderr," %s\n",tli->cmd);
|
|
}
|
|
exit(1);
|
|
}
|
|
break;
|
|
default:
|
|
case '?': /* Bad flag - print usage message */
|
|
arg_error = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If printing PDML or PS, force -V */
|
|
if (print_format == PR_FMT_PDML || print_format == PR_FMT_PS)
|
|
verbose = TRUE;
|
|
|
|
/* If no capture filter or read filter has been specified, and there are
|
|
still command-line arguments, treat them as the tokens of a capture
|
|
filter (if no "-r" flag was specified) or a read filter (if a "-r"
|
|
flag was specified. */
|
|
if (optind < argc) {
|
|
if (cf_name != NULL) {
|
|
if (rfilter != NULL) {
|
|
fprintf(stderr,
|
|
"tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
|
|
exit(2);
|
|
}
|
|
rfilter = get_args_as_string(argc, argv, optind);
|
|
} else {
|
|
#ifdef HAVE_LIBPCAP
|
|
if (capture_filter_specified) {
|
|
fprintf(stderr,
|
|
"tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
|
|
exit(2);
|
|
}
|
|
cfile.cfilter = get_args_as_string(argc, argv, optind);
|
|
#else
|
|
capture_option_specified = TRUE;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* See if we're writing a capture file and the file is a pipe */
|
|
#ifdef HAVE_LIBPCAP
|
|
ld.output_to_pipe = FALSE;
|
|
#endif
|
|
if (cfile.save_file != NULL) {
|
|
/* We're writing to a capture file. */
|
|
if (strcmp(cfile.save_file, "-") == 0) {
|
|
/* Write to the standard output. */
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = g_strdup("");
|
|
#ifdef HAVE_LIBPCAP
|
|
/* XXX - should we check whether it's a pipe? It's arguably
|
|
silly to do "-w - >output_file" rather than "-w output_file",
|
|
but by not checking we might be violating the Principle Of
|
|
Least Astonishment. */
|
|
ld.output_to_pipe = TRUE;
|
|
#endif
|
|
}
|
|
#ifdef HAVE_LIBPCAP
|
|
else {
|
|
err = test_for_fifo(cfile.save_file);
|
|
switch (err) {
|
|
|
|
case ENOENT: /* it doesn't exist, so we'll be creating it,
|
|
and it won't be a FIFO */
|
|
case 0: /* found it, but it's not a FIFO */
|
|
break;
|
|
|
|
case ESPIPE: /* it is a FIFO */
|
|
ld.output_to_pipe = TRUE;
|
|
break;
|
|
|
|
default: /* couldn't stat it */
|
|
fprintf(stderr,
|
|
"tethereal: Error testing whether capture file is a pipe: %s\n",
|
|
strerror(errno));
|
|
exit(2);
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
/* We're not writing to a file, so we should print packet information
|
|
unless "-q" was specified. */
|
|
if (!quiet)
|
|
print_packet_info = TRUE;
|
|
}
|
|
|
|
#ifndef HAVE_LIBPCAP
|
|
if (capture_option_specified)
|
|
fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
|
|
#endif
|
|
if (arg_error) {
|
|
print_usage(FALSE);
|
|
exit(1);
|
|
}
|
|
|
|
#ifdef HAVE_LIBPCAP
|
|
if (list_link_layer_types) {
|
|
/* We're supposed to list the link-layer types for an interface;
|
|
did the user also specify a capture file to be read? */
|
|
if (cf_name) {
|
|
/* Yes - that's bogus. */
|
|
fprintf(stderr, "tethereal: You cannot specify -L and a capture file to be read.\n");
|
|
exit(1);
|
|
}
|
|
/* No - did they specify a ring buffer option? */
|
|
if (capture_opts.ringbuffer_on) {
|
|
fprintf(stderr, "tethereal: Ring buffer requested, but a capture is not being done.\n");
|
|
exit(1);
|
|
}
|
|
} else {
|
|
/* If they didn't specify a "-w" flag, but specified a maximum capture
|
|
file size, tell them that this doesn't work, and exit. */
|
|
if (capture_opts.has_autostop_filesize && cfile.save_file == NULL) {
|
|
fprintf(stderr, "tethereal: Maximum capture file size specified, but "
|
|
"capture isn't being saved to a file.\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (capture_opts.ringbuffer_on) {
|
|
/* Ring buffer works only under certain conditions:
|
|
a) ring buffer does not work if you're not saving the capture to
|
|
a file;
|
|
b) ring buffer only works if you're saving in libpcap format;
|
|
c) it makes no sense to enable the ring buffer if the maximum
|
|
file size is set to "infinite";
|
|
d) file must not be a pipe. */
|
|
if (cfile.save_file == NULL) {
|
|
fprintf(stderr, "tethereal: Ring buffer requested, but "
|
|
"capture isn't being saved to a file.\n");
|
|
exit(1);
|
|
}
|
|
if (out_file_type != WTAP_FILE_PCAP) {
|
|
fprintf(stderr, "tethereal: Ring buffer requested, but "
|
|
"capture isn't being saved in libpcap format.\n");
|
|
exit(2);
|
|
}
|
|
if (!capture_opts.has_autostop_filesize) {
|
|
fprintf(stderr, "tethereal: Ring buffer requested, but "
|
|
"no maximum capture file size was specified.\n");
|
|
exit(2);
|
|
}
|
|
if (ld.output_to_pipe) {
|
|
fprintf(stderr, "tethereal: Ring buffer requested, but "
|
|
"capture file is a pipe.\n");
|
|
exit(2);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
/* Start windows sockets */
|
|
WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
|
|
#endif /* _WIN32 */
|
|
|
|
/* Notify all registered modules that have had any of their preferences
|
|
changed either from one of the preferences file or from the command
|
|
line that their preferences have changed. */
|
|
prefs_apply_all();
|
|
|
|
/* disabled protocols as per configuration file */
|
|
if (gdp_path == NULL && dp_path == NULL) {
|
|
set_disabled_protos_list();
|
|
}
|
|
|
|
/* Build the column format array */
|
|
col_setup(&cfile.cinfo, prefs->num_cols);
|
|
for (i = 0; i < cfile.cinfo.num_cols; i++) {
|
|
cfile.cinfo.col_fmt[i] = get_column_format(i);
|
|
cfile.cinfo.col_title[i] = g_strdup(get_column_title(i));
|
|
cfile.cinfo.fmt_matx[i] = (gboolean *) g_malloc0(sizeof(gboolean) *
|
|
NUM_COL_FMTS);
|
|
get_column_format_matches(cfile.cinfo.fmt_matx[i], cfile.cinfo.col_fmt[i]);
|
|
cfile.cinfo.col_data[i] = NULL;
|
|
if (cfile.cinfo.col_fmt[i] == COL_INFO)
|
|
cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_INFO_LEN);
|
|
else
|
|
cfile.cinfo.col_buf[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
|
|
cfile.cinfo.col_fence[i] = 0;
|
|
cfile.cinfo.col_expr[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
|
|
cfile.cinfo.col_expr_val[i] = (gchar *) g_malloc(sizeof(gchar) * COL_MAX_LEN);
|
|
}
|
|
|
|
for (i = 0; i < cfile.cinfo.num_cols; i++) {
|
|
int j;
|
|
|
|
for (j = 0; j < NUM_COL_FMTS; j++) {
|
|
if (!cfile.cinfo.fmt_matx[i][j])
|
|
continue;
|
|
|
|
if (cfile.cinfo.col_first[j] == -1)
|
|
cfile.cinfo.col_first[j] = i;
|
|
cfile.cinfo.col_last[j] = i;
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_LIBPCAP
|
|
if (capture_opts.snaplen < 1)
|
|
capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
|
|
else if (capture_opts.snaplen < MIN_PACKET_SIZE)
|
|
capture_opts.snaplen = MIN_PACKET_SIZE;
|
|
|
|
/* Check the value range of the ringbuffer_num_files parameter */
|
|
if (capture_opts.ringbuffer_num_files > RINGBUFFER_MAX_NUM_FILES)
|
|
capture_opts.ringbuffer_num_files = RINGBUFFER_MAX_NUM_FILES;
|
|
#if RINGBUFFER_MIN_NUM_FILES > 0
|
|
else if (capture_opts.ringbuffer_num_files < RINGBUFFER_MIN_NUM_FILES)
|
|
capture_opts.ringbuffer_num_files = RINGBUFFER_MIN_NUM_FILES;
|
|
#endif
|
|
#endif
|
|
|
|
if (rfilter != NULL) {
|
|
if (!dfilter_compile(rfilter, &rfcode)) {
|
|
fprintf(stderr, "tethereal: %s\n", dfilter_error_msg);
|
|
epan_cleanup();
|
|
#ifdef HAVE_PCAP_OPEN_DEAD
|
|
{
|
|
pcap_t *p;
|
|
|
|
p = pcap_open_dead(DLT_EN10MB, MIN_PACKET_SIZE);
|
|
if (p != NULL) {
|
|
if (pcap_compile(p, &fcode, rfilter, 0, 0) != -1) {
|
|
fprintf(stderr,
|
|
" Note: That display filter code looks like a valid capture filter;\n"
|
|
" maybe you mixed them up?\n");
|
|
}
|
|
pcap_close(p);
|
|
}
|
|
}
|
|
#endif
|
|
exit(2);
|
|
}
|
|
}
|
|
cfile.rfcode = rfcode;
|
|
|
|
/* We have to dissect each packet if:
|
|
|
|
we're printing information about each packet;
|
|
|
|
we're using a read filter on the packets;
|
|
|
|
we're using any taps. */
|
|
do_dissection = print_packet_info || rfcode || have_tap_listeners();
|
|
|
|
if (cf_name) {
|
|
/*
|
|
* We're reading a capture file.
|
|
*/
|
|
|
|
#ifndef _WIN32
|
|
/*
|
|
* Immediately relinquish any set-UID or set-GID privileges we have;
|
|
* we must not be allowed to read any capture files the user running
|
|
* Tethereal can't open.
|
|
*/
|
|
setuid(getuid());
|
|
setgid(getgid());
|
|
#endif
|
|
|
|
err = cf_open(cf_name, FALSE, &cfile);
|
|
if (err != 0) {
|
|
epan_cleanup();
|
|
exit(2);
|
|
}
|
|
err = load_cap_file(&cfile, out_file_type);
|
|
if (err != 0) {
|
|
epan_cleanup();
|
|
exit(2);
|
|
}
|
|
cf_name[0] = '\0';
|
|
} else {
|
|
/* No capture file specified, so we're supposed to do a live capture
|
|
(or get a list of link-layer types for a live capture device);
|
|
do we have support for live captures? */
|
|
#ifdef HAVE_LIBPCAP
|
|
|
|
#ifdef _WIN32
|
|
if (!has_wpcap) {
|
|
fprintf(stderr, "tethereal: Could not load wpcap.dll.\n");
|
|
exit(2);
|
|
}
|
|
#endif
|
|
|
|
/* Yes; did the user specify an interface to use? */
|
|
if (cfile.iface == NULL) {
|
|
/* No - is a default specified in the preferences file? */
|
|
if (prefs->capture_device != NULL) {
|
|
/* Yes - use it. */
|
|
if_text = strrchr(prefs->capture_device, ' ');
|
|
if (if_text == NULL) {
|
|
cfile.iface = g_strdup(prefs->capture_device);
|
|
} else {
|
|
cfile.iface = g_strdup(if_text + 1); /* Skip over space */
|
|
}
|
|
} else {
|
|
/* No - pick the first one from the list of interfaces. */
|
|
if_list = get_interface_list(&err, err_str);
|
|
if (if_list == NULL) {
|
|
switch (err) {
|
|
|
|
case CANT_GET_INTERFACE_LIST:
|
|
cant_get_if_list_errstr =
|
|
cant_get_if_list_error_message(err_str);
|
|
fprintf(stderr, "tethereal: %s\n", cant_get_if_list_errstr);
|
|
g_free(cant_get_if_list_errstr);
|
|
break;
|
|
|
|
case NO_INTERFACES_FOUND:
|
|
fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
|
|
break;
|
|
}
|
|
exit(2);
|
|
}
|
|
if_info = if_list->data; /* first interface */
|
|
cfile.iface = g_strdup(if_info->name);
|
|
free_interface_list(if_list);
|
|
}
|
|
}
|
|
|
|
if (list_link_layer_types) {
|
|
/* We were asked to list the link-layer types for an interface.
|
|
Get the list of link-layer types for the capture device. */
|
|
lt_list = get_pcap_linktype_list(cfile.iface, err_str);
|
|
if (lt_list == NULL) {
|
|
if (err_str[0] != '\0') {
|
|
fprintf(stderr, "tethereal: The list of data link types for the capture device could not be obtained (%s).\n"
|
|
"Please check to make sure you have sufficient permissions, and that\n"
|
|
"you have the proper interface or pipe specified.\n", err_str);
|
|
} else
|
|
fprintf(stderr, "tethereal: The capture device has no data link types.\n");
|
|
exit(2);
|
|
}
|
|
fprintf(stderr, "Data link types (use option -y to set):\n");
|
|
for (lt_entry = lt_list; lt_entry != NULL;
|
|
lt_entry = g_list_next(lt_entry)) {
|
|
data_link_info = lt_entry->data;
|
|
fprintf(stderr, " %s", data_link_info->name);
|
|
if (data_link_info->description != NULL)
|
|
fprintf(stderr, " (%s)", data_link_info->description);
|
|
else
|
|
fprintf(stderr, " (not supported)");
|
|
putchar('\n');
|
|
}
|
|
free_pcap_linktype_list(lt_list);
|
|
exit(0);
|
|
}
|
|
|
|
capture(out_file_type);
|
|
|
|
if (capture_opts.ringbuffer_on) {
|
|
ringbuf_free();
|
|
}
|
|
#else
|
|
/* No - complain. */
|
|
fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");
|
|
exit(2);
|
|
#endif
|
|
}
|
|
|
|
draw_tap_listeners(TRUE);
|
|
epan_cleanup();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_LIBPCAP
|
|
/* Do the low-level work of a capture.
|
|
Returns TRUE if it succeeds, FALSE otherwise. */
|
|
|
|
static condition *volatile cnd_ring_timeout = NULL; /* this must be visible in process_packet */
|
|
|
|
static int
|
|
capture(int out_file_type)
|
|
{
|
|
int pcap_encap;
|
|
int file_snaplen;
|
|
gchar open_err_str[PCAP_ERRBUF_SIZE];
|
|
gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
|
|
bpf_u_int32 netnum, netmask;
|
|
struct bpf_program fcode;
|
|
const char *set_linktype_err_str;
|
|
int err = 0;
|
|
int volatile volatile_err = 0;
|
|
int volatile inpkts = 0;
|
|
int pcap_cnt;
|
|
char errmsg[1024+1];
|
|
condition *volatile cnd_stop_capturesize = NULL;
|
|
condition *volatile cnd_stop_timeout = NULL;
|
|
#ifndef _WIN32
|
|
void (*oldhandler)(int);
|
|
static const char ppamsg[] = "can't find PPA for ";
|
|
char *libpcap_warn;
|
|
volatile int pipe_fd = -1;
|
|
struct pcap_hdr hdr;
|
|
struct pcaprec_modified_hdr rechdr;
|
|
guchar pcap_data[WTAP_MAX_PACKET_SIZE];
|
|
#endif
|
|
struct pcap_stat stats;
|
|
gboolean write_err;
|
|
gboolean dump_ok;
|
|
dfilter_t *rfcode = NULL;
|
|
|
|
/* Initialize all data structures used for dissection. */
|
|
init_dissection();
|
|
|
|
ld.linktype = WTAP_ENCAP_UNKNOWN;
|
|
ld.pdh = NULL;
|
|
|
|
/* Open the network interface to capture from it.
|
|
Some versions of libpcap may put warnings into the error buffer
|
|
if they succeed; to tell if that's happened, we have to clear
|
|
the error buffer, and check if it's still a null string. */
|
|
open_err_str[0] = '\0';
|
|
ld.pch = pcap_open_live(cfile.iface, capture_opts.snaplen,
|
|
capture_opts.promisc_mode, 1000, open_err_str);
|
|
|
|
if (ld.pch != NULL) {
|
|
/* setting the data link type only works on real interfaces */
|
|
if (capture_opts.linktype != -1) {
|
|
set_linktype_err_str = set_pcap_linktype(ld.pch, cfile.iface,
|
|
capture_opts.linktype);
|
|
if (set_linktype_err_str != NULL) {
|
|
snprintf(errmsg, sizeof errmsg, "Unable to set data link type (%s).",
|
|
set_linktype_err_str);
|
|
goto error;
|
|
}
|
|
}
|
|
} else {
|
|
/* We couldn't open "cfile.iface" as a network device. */
|
|
#ifdef _WIN32
|
|
/* On Windows, we don't support capturing on pipes, so we give up. */
|
|
|
|
/* On Win32 OSes, the capture devices are probably available to all
|
|
users; don't warn about permissions problems.
|
|
|
|
Do, however, warn that WAN devices aren't supported. */
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The capture session could not be initiated (%s).\n"
|
|
"Please check that you have the proper interface specified.\n"
|
|
"\n"
|
|
"Note that the WinPcap 2.x version of the driver Ethereal uses for packet\n"
|
|
"capture on Windows doesn't support capturing on PPP/WAN interfaces in\n"
|
|
"Windows NT/2000/XP/2003 Server, and that the WinPcap 3.0 and later versions\n"
|
|
"don't support capturing on PPP/WAN interfaces at all.\n",
|
|
open_err_str);
|
|
goto error;
|
|
#else
|
|
/* try to open cfile.iface as a pipe */
|
|
pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
|
|
|
|
if (pipe_fd == -1) {
|
|
|
|
if (ld.pipe_err == PIPNEXIST) {
|
|
/* Pipe doesn't exist, so output message for interface */
|
|
|
|
/* If we got a "can't find PPA for XXX" message, warn the user (who
|
|
is running Tethereal on HP-UX) that they don't have a version
|
|
of libpcap that properly handles HP-UX (libpcap 0.6.x and later
|
|
versions, which properly handle HP-UX, say "can't find /dev/dlpi
|
|
PPA for XXX" rather than "can't find PPA for XXX"). */
|
|
if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
|
|
libpcap_warn =
|
|
"\n\n"
|
|
"You are running Tethereal with a version of the libpcap library\n"
|
|
"that doesn't handle HP-UX network devices well; this means that\n"
|
|
"Tethereal may not be able to capture packets.\n"
|
|
"\n"
|
|
"To fix this, you should install libpcap 0.6.2, or a later version\n"
|
|
"of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
|
|
"packaged binary form from the Software Porting And Archive Centre\n"
|
|
"for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
|
|
"at the URL lists a number of mirror sites.";
|
|
else
|
|
libpcap_warn = "";
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The capture session could not be initiated (%s).\n"
|
|
"Please check to make sure you have sufficient permissions, and that\n"
|
|
"you have the proper interface or pipe specified.%s", open_err_str,
|
|
libpcap_warn);
|
|
}
|
|
/*
|
|
* Else pipe (or file) does exist and pipe_open_live() has
|
|
* filled in errmsg
|
|
*/
|
|
goto error;
|
|
} else
|
|
/* pipe_open_live() succeeded; don't want
|
|
error message from pcap_open_live() */
|
|
open_err_str[0] = '\0';
|
|
#endif
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
/*
|
|
* We've opened the capture device, so, if we're set-UID or set-GID,
|
|
* relinquish those privileges.
|
|
*
|
|
* XXX - if we have saved set-user-ID support, we should give up those
|
|
* privileges immediately, and then reclaim them long enough to get
|
|
* a list of network interfaces and to open one, and then give them
|
|
* up again, so that stuff we do while processing the argument list,
|
|
* reading the user's preferences, etc. is done as the real user and
|
|
* group, not the effective user and group.
|
|
*/
|
|
setuid(getuid());
|
|
setgid(getgid());
|
|
#endif
|
|
|
|
if (cfile.cfilter && !ld.from_pipe) {
|
|
/* A capture filter was specified; set it up. */
|
|
if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
|
|
/*
|
|
* Well, we can't get the netmask for this interface; it's used
|
|
* only for filters that check for broadcast IP addresses, so
|
|
* we just warn the user, and punt and use 0.
|
|
*/
|
|
fprintf(stderr,
|
|
"Warning: Couldn't obtain netmask info (%s).\n", lookup_net_err_str);
|
|
netmask = 0;
|
|
}
|
|
if (pcap_compile(ld.pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
|
|
if (dfilter_compile(cfile.cfilter, &rfcode)) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"Unable to parse capture filter string (%s).\n"
|
|
" Interestingly enough, this looks like a valid display filter\n"
|
|
" Are you sure you didn't mix them up?",
|
|
pcap_geterr(ld.pch));
|
|
} else {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"Unable to parse capture filter string (%s).",
|
|
pcap_geterr(ld.pch));
|
|
}
|
|
goto error;
|
|
}
|
|
if (pcap_setfilter(ld.pch, &fcode) < 0) {
|
|
snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
|
|
pcap_geterr(ld.pch));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Set up to write to the capture file. */
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
pcap_encap = hdr.network;
|
|
file_snaplen = hdr.snaplen;
|
|
} else
|
|
#endif
|
|
{
|
|
pcap_encap = get_pcap_linktype(ld.pch, cfile.iface);
|
|
file_snaplen = pcap_snapshot(ld.pch);
|
|
}
|
|
ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
|
|
if (cfile.save_file != NULL) {
|
|
/* Set up to write to the capture file. */
|
|
if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
|
|
strcpy(errmsg, "The network you're capturing from is of a type"
|
|
" that Tethereal doesn't support.");
|
|
goto error;
|
|
}
|
|
if (capture_opts.ringbuffer_on) {
|
|
cfile.save_file_fd = ringbuf_init(cfile.save_file,
|
|
capture_opts.ringbuffer_num_files);
|
|
if (cfile.save_file_fd != -1) {
|
|
ld.pdh = ringbuf_init_wtap_dump_fdopen(out_file_type, ld.linktype,
|
|
pcap_snapshot(ld.pch), &err);
|
|
} else {
|
|
err = errno; /* "ringbuf_init()" failed */
|
|
ld.pdh = NULL;
|
|
}
|
|
} else {
|
|
ld.pdh = wtap_dump_open(cfile.save_file, out_file_type,
|
|
ld.linktype, pcap_snapshot(ld.pch), &err);
|
|
}
|
|
|
|
if (ld.pdh == NULL) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
cf_open_error_message(err, NULL, TRUE, out_file_type),
|
|
*cfile.save_file == '\0' ? "stdout" : cfile.save_file);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
|
|
returned a warning; print it, but keep capturing. */
|
|
if (open_err_str[0] != '\0')
|
|
fprintf(stderr, "tethereal: WARNING: %s.\n", open_err_str);
|
|
|
|
#ifdef _WIN32
|
|
/* Catch a CTRL+C event and, if we get it, clean up and exit. */
|
|
SetConsoleCtrlHandler(capture_cleanup, TRUE);
|
|
#else /* _WIN32 */
|
|
/* Catch SIGINT and SIGTERM and, if we get either of them, clean up
|
|
and exit.
|
|
XXX - deal with signal semantics on various UNIX platforms. Or just
|
|
use "sigaction()" and be done with it? */
|
|
signal(SIGTERM, capture_cleanup);
|
|
signal(SIGINT, capture_cleanup);
|
|
if ((oldhandler = signal(SIGHUP, capture_cleanup)) != SIG_DFL)
|
|
signal(SIGHUP, oldhandler);
|
|
|
|
#ifdef SIGINFO
|
|
/* Catch SIGINFO and, if we get it and we're capturing to a file in
|
|
quiet mode, report the number of packets we've captured. */
|
|
signal(SIGINFO, report_counts_siginfo);
|
|
#endif /* SIGINFO */
|
|
#endif /* _WIN32 */
|
|
|
|
/* Let the user know what interface was chosen. */
|
|
fprintf(stderr, "Capturing on %s\n", cfile.iface);
|
|
|
|
/* initialize capture stop conditions */
|
|
init_capture_stop_conditions();
|
|
/* create stop conditions */
|
|
if (capture_opts.has_autostop_filesize)
|
|
cnd_stop_capturesize = cnd_new((const char*)CND_CLASS_CAPTURESIZE,
|
|
(long)capture_opts.autostop_filesize * 1000);
|
|
if (capture_opts.has_autostop_duration)
|
|
cnd_stop_timeout = cnd_new((const char*)CND_CLASS_TIMEOUT,
|
|
(gint32)capture_opts.autostop_duration);
|
|
|
|
if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
|
|
cnd_ring_timeout = cnd_new(CND_CLASS_TIMEOUT,
|
|
capture_opts.ringbuffer_duration);
|
|
|
|
if (!setjmp(ld.stopenv)) {
|
|
ld.go = TRUE;
|
|
ld.packet_count = 0;
|
|
} else
|
|
ld.go = FALSE;
|
|
while (ld.go) {
|
|
/* We need to be careful with automatic variables defined in the
|
|
outer scope which are changed inside the loop. Most compilers
|
|
don't try to roll them back to their original values after the
|
|
longjmp which causes the loop to finish, but all that the
|
|
standards say is that their values are indeterminate. If we
|
|
don't want them to be rolled back, we should define them with the
|
|
volatile attribute (paraphrasing W. Richard Stevens, Advanced
|
|
Programming in the UNIX Environment, p. 178).
|
|
|
|
The "err" variable causes a particular problem. If we give it
|
|
the volatile attribute, then when we pass a reference to it (as
|
|
in "&err") to a function, GCC warns: "passing arg <n> of
|
|
<function> discards qualifiers from pointer target type".
|
|
Therefore within the loop and just beyond we don't use "err".
|
|
Within the loop we define "loop_err", and assign its value to
|
|
"volatile_err", which is in the outer scope and is checked when
|
|
the loop finishes.
|
|
|
|
We also define "packet_count_prev" here to keep things tidy,
|
|
since it's used only inside the loop. If it were defined in the
|
|
outer scope, GCC would give a warning (unnecessary in this case)
|
|
that it might be clobbered, and we'd need to give it the volatile
|
|
attribute to suppress the warning. */
|
|
|
|
int loop_err = 0;
|
|
int packet_count_prev = 0;
|
|
|
|
if (cnd_stop_capturesize == NULL && cnd_stop_timeout == NULL) {
|
|
/* We're not stopping at a particular capture file size, and we're
|
|
not stopping after some particular amount of time has expired,
|
|
so either we have no stop condition or the only stop condition
|
|
is a maximum packet count.
|
|
|
|
If there's no maximum packet count, pass it -1, meaning "until
|
|
you run out of packets in the bufferful you read". Otherwise,
|
|
pass it the number of packets we have left to capture.
|
|
|
|
We don't call "pcap_loop()" as, if we're saving to a file that's
|
|
a FIFO, we want to flush the FIFO after we're done processing
|
|
this libpcap bufferful of packets, so that the program
|
|
reading the FIFO sees the packets immediately and doesn't get
|
|
any partial packet, forcing it to block in the middle of reading
|
|
that packet. */
|
|
if (capture_opts.autostop_count == 0)
|
|
pcap_cnt = -1;
|
|
else {
|
|
if (ld.packet_count >= capture_opts.autostop_count) {
|
|
/* XXX do we need this test here? */
|
|
/* It appears there's nothing more to capture. */
|
|
break;
|
|
}
|
|
pcap_cnt = capture_opts.autostop_count - ld.packet_count;
|
|
}
|
|
} else {
|
|
/* We need to check the capture file size or the timeout after
|
|
each packet. */
|
|
pcap_cnt = 1;
|
|
}
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
|
|
errmsg, sizeof errmsg);
|
|
} else
|
|
#endif
|
|
inpkts = pcap_dispatch(ld.pch, pcap_cnt, capture_pcap_cb, (guchar *) &ld);
|
|
if (inpkts < 0) {
|
|
/* Error from "pcap_dispatch()", or error or "no more packets" from
|
|
"pipe_dispatch(). */
|
|
ld.go = FALSE;
|
|
} else if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
|
|
/* The specified capture time has elapsed; stop the capture. */
|
|
ld.go = FALSE;
|
|
} else if (inpkts > 0) {
|
|
if (capture_opts.autostop_count != 0 &&
|
|
ld.packet_count >= capture_opts.autostop_count) {
|
|
/* The specified number of packets have been captured and have
|
|
passed both any capture filter in effect and any read filter
|
|
in effect. */
|
|
ld.go = FALSE;
|
|
} else if (cnd_stop_capturesize != NULL &&
|
|
cnd_eval(cnd_stop_capturesize,
|
|
(guint32)wtap_get_bytes_dumped(ld.pdh))) {
|
|
/* We're saving the capture to a file, and the capture file reached
|
|
its maximum size. */
|
|
if (capture_opts.ringbuffer_on) {
|
|
/* Switch to the next ringbuffer file */
|
|
if (ringbuf_switch_file(&cfile, &ld.pdh, &loop_err)) {
|
|
/* File switch succeeded: reset the condition */
|
|
cnd_reset(cnd_stop_capturesize);
|
|
if (cnd_ring_timeout) {
|
|
cnd_reset(cnd_ring_timeout);
|
|
}
|
|
} else {
|
|
/* File switch failed: stop here */
|
|
volatile_err = loop_err;
|
|
ld.go = FALSE;
|
|
}
|
|
} else {
|
|
/* No ringbuffer - just stop. */
|
|
ld.go = FALSE;
|
|
}
|
|
}
|
|
if (ld.output_to_pipe) {
|
|
if (ld.packet_count > packet_count_prev) {
|
|
if (fflush(wtap_dump_file(ld.pdh))) {
|
|
volatile_err = errno;
|
|
ld.go = FALSE;
|
|
}
|
|
packet_count_prev = ld.packet_count;
|
|
}
|
|
}
|
|
} /* inpkts > 0 */
|
|
} /* while (ld.go) */
|
|
|
|
/* delete stop conditions */
|
|
if (cnd_stop_capturesize != NULL)
|
|
cnd_delete(cnd_stop_capturesize);
|
|
if (cnd_stop_timeout != NULL)
|
|
cnd_delete(cnd_stop_timeout);
|
|
if (cnd_ring_timeout != NULL)
|
|
cnd_delete(cnd_ring_timeout);
|
|
|
|
if ((cfile.save_file != NULL) && !quiet) {
|
|
/* We're saving to a file, which means we're printing packet counts
|
|
to stderr if we are not running silent and deep.
|
|
Send a newline so that we move to the line after the packet count. */
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
/* If we got an error while capturing, report it. */
|
|
if (inpkts < 0) {
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
if (ld.pipe_err == PIPERR) {
|
|
fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
|
|
errmsg);
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
fprintf(stderr, "tethereal: Error while capturing packets: %s\n",
|
|
pcap_geterr(ld.pch));
|
|
}
|
|
}
|
|
|
|
if (volatile_err == 0)
|
|
write_err = FALSE;
|
|
else {
|
|
show_capture_file_io_error(cfile.save_file, volatile_err, FALSE);
|
|
write_err = TRUE;
|
|
}
|
|
|
|
if (cfile.save_file != NULL) {
|
|
/* We're saving to a file or files; close all files. */
|
|
if (capture_opts.ringbuffer_on) {
|
|
dump_ok = ringbuf_wtap_dump_close(&cfile, &err);
|
|
} else {
|
|
dump_ok = wtap_dump_close(ld.pdh, &err);
|
|
}
|
|
/* If we've displayed a message about a write error, there's no point
|
|
in displaying another message about an error on close. */
|
|
if (!dump_ok && !write_err)
|
|
show_capture_file_io_error(cfile.save_file, err, TRUE);
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe && pipe_fd >= 0)
|
|
close(pipe_fd);
|
|
else
|
|
#endif
|
|
{
|
|
/* Get the capture statistics, and, if any packets were dropped, report
|
|
that. */
|
|
if (pcap_stats(ld.pch, &stats) >= 0) {
|
|
if (stats.ps_drop != 0) {
|
|
fprintf(stderr, "%u packets dropped\n", stats.ps_drop);
|
|
}
|
|
} else {
|
|
fprintf(stderr, "tethereal: Can't get packet-drop statistics: %s\n",
|
|
pcap_geterr(ld.pch));
|
|
}
|
|
pcap_close(ld.pch);
|
|
}
|
|
|
|
/* Report the number of captured packets if not reported during capture
|
|
and we are saving to a file. */
|
|
report_counts();
|
|
|
|
return TRUE;
|
|
|
|
error:
|
|
if (capture_opts.ringbuffer_on) {
|
|
ringbuf_error_cleanup();
|
|
}
|
|
g_free(cfile.save_file);
|
|
cfile.save_file = NULL;
|
|
fprintf(stderr, "tethereal: %s\n", errmsg);
|
|
#ifndef _WIN32
|
|
if (ld.from_pipe) {
|
|
if (pipe_fd >= 0)
|
|
close(pipe_fd);
|
|
} else
|
|
#endif
|
|
{
|
|
if (ld.pch != NULL)
|
|
pcap_close(ld.pch);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static void
|
|
capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
|
|
const guchar *pd)
|
|
{
|
|
struct wtap_pkthdr whdr;
|
|
union wtap_pseudo_header pseudo_header;
|
|
loop_data *ld = (loop_data *) user;
|
|
int loop_err;
|
|
int err;
|
|
|
|
/* Convert from libpcap to Wiretap format.
|
|
If that fails, ignore the packet (wtap_process_pcap_packet has
|
|
written an error message). */
|
|
pd = wtap_process_pcap_packet(ld->linktype, phdr, pd, &pseudo_header,
|
|
&whdr, &err);
|
|
if (pd == NULL)
|
|
return;
|
|
|
|
#ifdef SIGINFO
|
|
/*
|
|
* Prevent a SIGINFO handler from writing to stdout while we're
|
|
* doing so; instead, have it just set a flag telling us to print
|
|
* that information when we're done.
|
|
*/
|
|
infodelay = TRUE;
|
|
#endif /* SIGINFO */
|
|
|
|
/* The current packet may have arrived after a very long silence,
|
|
* way past the time to switch files. In order not to have
|
|
* the first packet of a new series of events as the last
|
|
* [or only] packet in the file, switch before writing!
|
|
*/
|
|
if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
|
|
/* time elapsed for this ring file, switch to the next */
|
|
if (ringbuf_switch_file(&cfile, &ld->pdh, &loop_err)) {
|
|
/* File switch succeeded: reset the condition */
|
|
cnd_reset(cnd_ring_timeout);
|
|
} else {
|
|
/* File switch failed: stop here */
|
|
/* XXX - we should do something with "loop_err" */
|
|
ld->go = FALSE;
|
|
}
|
|
}
|
|
|
|
if (!process_packet(&cfile, ld->pdh, 0, &whdr, &pseudo_header, pd, &err)) {
|
|
/* Error writing to a capture file */
|
|
if (!quiet) {
|
|
/* We're capturing packets, so (if -q not specified) we're printing
|
|
a count of packets captured; move to the line after the count. */
|
|
fprintf(stderr, "\n");
|
|
}
|
|
show_capture_file_io_error(cfile.save_file, err, FALSE);
|
|
pcap_close(ld->pch);
|
|
wtap_dump_close(ld->pdh, &err);
|
|
exit(2);
|
|
}
|
|
|
|
#ifdef SIGINFO
|
|
/*
|
|
* Allow SIGINFO handlers to write.
|
|
*/
|
|
infodelay = FALSE;
|
|
|
|
/*
|
|
* If a SIGINFO handler asked us to write out capture counts, do so.
|
|
*/
|
|
if (infoprint)
|
|
report_counts();
|
|
#endif /* SIGINFO */
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
static BOOL WINAPI
|
|
capture_cleanup(DWORD ctrltype _U_)
|
|
{
|
|
/* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
|
|
Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
|
|
is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
|
|
like SIGTERM at least when the machine's shutting down.
|
|
|
|
For now, we handle them all as indications that we should clean up
|
|
and quit, just as we handle SIGINT, SIGHUP, and SIGTERM in that
|
|
way on UNIX.
|
|
|
|
However, as handlers run in a new thread, we can't just longjmp
|
|
out; we have to set "ld.go" to FALSE, and must return TRUE so that
|
|
no other handler - such as one that would terminate the process -
|
|
gets called.
|
|
|
|
XXX - for some reason, typing ^C to Tethereal, if you run this in
|
|
a Cygwin console window in at least some versions of Cygwin,
|
|
causes Tethereal to terminate immediately; this routine gets
|
|
called, but the main loop doesn't get a chance to run and
|
|
exit cleanly, at least if this is compiled with Microsoft Visual
|
|
C++ (i.e., it's a property of the Cygwin console window or Bash;
|
|
it happens if Tethereal is not built with Cygwin - for all I know,
|
|
building it with Cygwin may make the problem go away). */
|
|
ld.go = FALSE;
|
|
return TRUE;
|
|
}
|
|
#else
|
|
static void
|
|
capture_cleanup(int signum _U_)
|
|
{
|
|
/* Longjmp back to the starting point; "pcap_dispatch()", on many
|
|
UNIX platforms, just keeps looping if it gets EINTR, so if we set
|
|
"ld.go" to FALSE and return, we won't break out of it and quit
|
|
capturing. */
|
|
longjmp(ld.stopenv, 1);
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
static void
|
|
report_counts(void)
|
|
{
|
|
#ifdef SIGINFO
|
|
/* XXX - if we use sigaction, this doesn't have to be done.
|
|
(Yes, this isn't necessary on BSD, but just in case a system
|
|
where "signal()" has AT&T semantics adopts SIGINFO....) */
|
|
signal(SIGINFO, report_counts_siginfo);
|
|
#endif /* SIGINFO */
|
|
|
|
if (quiet || print_packet_info) {
|
|
/* Report the count only if we aren't printing a packet count
|
|
as packets arrive. */
|
|
fprintf(stderr, "%u packets captured\n", ld.packet_count);
|
|
}
|
|
#ifdef SIGINFO
|
|
infoprint = FALSE; /* we just reported it */
|
|
#endif /* SIGINFO */
|
|
}
|
|
|
|
#ifdef SIGINFO
|
|
static void
|
|
report_counts_siginfo(int signum _U_)
|
|
{
|
|
int sav_errno = errno;
|
|
/* If we've been told to delay printing, just set a flag asking
|
|
that we print counts (if we're supposed to), otherwise print
|
|
the count of packets captured (if we're supposed to). */
|
|
if (infodelay)
|
|
infoprint = TRUE;
|
|
else
|
|
report_counts();
|
|
errno = sav_errno;
|
|
}
|
|
#endif /* SIGINFO */
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
static int
|
|
load_cap_file(capture_file *cf, int out_file_type)
|
|
{
|
|
gint linktype;
|
|
int snapshot_length;
|
|
wtap_dumper *pdh;
|
|
int err;
|
|
gchar *err_info;
|
|
long data_offset;
|
|
|
|
linktype = wtap_file_encap(cf->wth);
|
|
if (cf->save_file != NULL) {
|
|
/* Set up to write to the capture file. */
|
|
snapshot_length = wtap_snapshot_length(cf->wth);
|
|
if (snapshot_length == 0) {
|
|
/* Snapshot length of input file not known. */
|
|
snapshot_length = WTAP_MAX_PACKET_SIZE;
|
|
}
|
|
pdh = wtap_dump_open(cf->save_file, out_file_type,
|
|
linktype, snapshot_length, &err);
|
|
|
|
if (pdh == NULL) {
|
|
/* We couldn't set up to write to the capture file. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
|
|
fprintf(stderr,
|
|
"tethereal: Capture files can't be written in that format.\n");
|
|
break;
|
|
|
|
case WTAP_ERR_UNSUPPORTED_ENCAP:
|
|
case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
|
|
fprintf(stderr,
|
|
"tethereal: The capture file being read cannot be written in "
|
|
"that format.\n");
|
|
break;
|
|
|
|
case WTAP_ERR_CANT_OPEN:
|
|
fprintf(stderr,
|
|
"tethereal: The file \"%s\" couldn't be created for some "
|
|
"unknown reason.\n",
|
|
*cf->save_file == '\0' ? "stdout" : cf->save_file);
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
fprintf(stderr,
|
|
"tethereal: A full header couldn't be written to the file \"%s\".\n",
|
|
*cf->save_file == '\0' ? "stdout" : cf->save_file);
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr,
|
|
"tethereal: The file \"%s\" could not be created: %s\n.",
|
|
*cf->save_file == '\0' ? "stdout" : cf->save_file,
|
|
wtap_strerror(err));
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
} else {
|
|
print_preamble(stdout, print_format, cf->filename);
|
|
if (ferror(stdout)) {
|
|
err = errno;
|
|
show_print_file_io_error(err);
|
|
goto out;
|
|
}
|
|
pdh = NULL;
|
|
}
|
|
while (wtap_read(cf->wth, &err, &err_info, &data_offset)) {
|
|
if (!process_packet(cf, pdh, data_offset, wtap_phdr(cf->wth),
|
|
wtap_pseudoheader(cf->wth), wtap_buf_ptr(cf->wth),
|
|
&err)) {
|
|
/* Error writing to a capture file */
|
|
show_capture_file_io_error(cf->save_file, err, FALSE);
|
|
wtap_dump_close(pdh, &err);
|
|
exit(2);
|
|
}
|
|
}
|
|
if (err != 0) {
|
|
/* Print a message noting that the read failed somewhere along the line. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_UNSUPPORTED_ENCAP:
|
|
fprintf(stderr,
|
|
"tethereal: \"%s\" is a capture file is for a network type that Tethereal doesn't support.\n(%s)\n",
|
|
cf->filename, err_info);
|
|
break;
|
|
|
|
case WTAP_ERR_CANT_READ:
|
|
fprintf(stderr,
|
|
"tethereal: An attempt to read from \"%s\" failed for some unknown reason.\n",
|
|
cf->filename);
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_READ:
|
|
fprintf(stderr,
|
|
"tethereal: \"%s\" appears to have been cut short in the middle of a packet.\n",
|
|
cf->filename);
|
|
break;
|
|
|
|
case WTAP_ERR_BAD_RECORD:
|
|
fprintf(stderr,
|
|
"tethereal: \"%s\" appears to be damaged or corrupt.\n(%s)\n",
|
|
cf->filename, err_info);
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr,
|
|
"tethereal: An error occurred while reading \"%s\": %s.\n",
|
|
cf->filename, wtap_strerror(err));
|
|
break;
|
|
}
|
|
if (cf->save_file != NULL) {
|
|
/* Now close the capture file. */
|
|
if (!wtap_dump_close(pdh, &err))
|
|
show_capture_file_io_error(cfile.save_file, err, TRUE);
|
|
}
|
|
} else {
|
|
if (cf->save_file != NULL) {
|
|
/* Now close the capture file. */
|
|
if (!wtap_dump_close(pdh, &err))
|
|
show_capture_file_io_error(cfile.save_file, err, TRUE);
|
|
} else {
|
|
print_finale(stdout, print_format);
|
|
if (ferror(stdout)) {
|
|
err = errno;
|
|
show_print_file_io_error(err);
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
wtap_close(cf->wth);
|
|
cf->wth = NULL;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
fill_in_fdata(frame_data *fdata, capture_file *cf,
|
|
const struct wtap_pkthdr *phdr, long offset)
|
|
{
|
|
fdata->next = NULL;
|
|
fdata->prev = NULL;
|
|
fdata->pfd = NULL;
|
|
fdata->num = cf->count;
|
|
fdata->pkt_len = phdr->len;
|
|
cum_bytes += phdr->len;
|
|
fdata->cum_bytes = cum_bytes;
|
|
fdata->cap_len = phdr->caplen;
|
|
fdata->file_off = offset;
|
|
fdata->lnk_t = phdr->pkt_encap;
|
|
fdata->abs_secs = phdr->ts.tv_sec;
|
|
fdata->abs_usecs = phdr->ts.tv_usec;
|
|
fdata->flags.passed_dfilter = 0;
|
|
fdata->flags.encoding = CHAR_ASCII;
|
|
fdata->flags.visited = 0;
|
|
fdata->flags.marked = 0;
|
|
fdata->flags.ref_time = 0;
|
|
|
|
/* If we don't have the time stamp of the first packet in the
|
|
capture, it's because this is the first packet. Save the time
|
|
stamp of this packet as the time stamp of the first packet. */
|
|
if (!firstsec && !firstusec) {
|
|
firstsec = fdata->abs_secs;
|
|
firstusec = fdata->abs_usecs;
|
|
}
|
|
|
|
/* If we don't have the time stamp of the previous displayed packet,
|
|
it's because this is the first displayed packet. Save the time
|
|
stamp of this packet as the time stamp of the previous displayed
|
|
packet. */
|
|
if (!prevsec && !prevusec) {
|
|
prevsec = fdata->abs_secs;
|
|
prevusec = fdata->abs_usecs;
|
|
}
|
|
|
|
/* Get the time elapsed between the first packet and this packet. */
|
|
compute_timestamp_diff(&fdata->rel_secs, &fdata->rel_usecs,
|
|
fdata->abs_secs, fdata->abs_usecs, firstsec, firstusec);
|
|
|
|
/* If it's greater than the current elapsed time, set the elapsed time
|
|
to it (we check for "greater than" so as not to be confused by
|
|
time moving backwards). */
|
|
if ((gint32)cf->esec < fdata->rel_secs
|
|
|| ((gint32)cf->esec == fdata->rel_secs && (gint32)cf->eusec < fdata->rel_usecs)) {
|
|
cf->esec = fdata->rel_secs;
|
|
cf->eusec = fdata->rel_usecs;
|
|
}
|
|
|
|
/* Get the time elapsed between the previous displayed packet and
|
|
this packet. */
|
|
compute_timestamp_diff(&fdata->del_secs, &fdata->del_usecs,
|
|
fdata->abs_secs, fdata->abs_usecs, prevsec, prevusec);
|
|
prevsec = fdata->abs_secs;
|
|
prevusec = fdata->abs_usecs;
|
|
}
|
|
|
|
/* Free up all data attached to a "frame_data" structure. */
|
|
static void
|
|
clear_fdata(frame_data *fdata)
|
|
{
|
|
if (fdata->pfd)
|
|
g_slist_free(fdata->pfd);
|
|
}
|
|
|
|
static gboolean
|
|
process_packet(capture_file *cf, wtap_dumper *pdh, long offset,
|
|
const struct wtap_pkthdr *whdr,
|
|
union wtap_pseudo_header *pseudo_header, const guchar *pd,
|
|
int *err)
|
|
{
|
|
frame_data fdata;
|
|
gboolean create_proto_tree;
|
|
epan_dissect_t *edt;
|
|
gboolean passed;
|
|
|
|
/* Count this packet. */
|
|
cf->count++;
|
|
|
|
/* If we're going to print packet information, or we're going to
|
|
run a read filter, or we're going to process taps, set up to
|
|
do a dissection and do so. */
|
|
if (do_dissection) {
|
|
fill_in_fdata(&fdata, cf, whdr, offset);
|
|
|
|
if (print_packet_info) {
|
|
/* Grab any resolved addresses */
|
|
|
|
if (g_resolv_flags) {
|
|
host_name_lookup_process(NULL);
|
|
}
|
|
}
|
|
|
|
passed = TRUE;
|
|
if (cf->rfcode || verbose || num_tap_filters!=0)
|
|
create_proto_tree = TRUE;
|
|
else
|
|
create_proto_tree = FALSE;
|
|
/* The protocol tree will be "visible", i.e., printed, only if we're
|
|
printing packet details, which is true if we're printing stuff
|
|
("print_packet_info" is true) and we're in verbose mode ("verbose"
|
|
is true). */
|
|
edt = epan_dissect_new(create_proto_tree, print_packet_info && verbose);
|
|
|
|
/* If we're running a read filter, prime the epan_dissect_t with that
|
|
filter. */
|
|
if (cf->rfcode)
|
|
epan_dissect_prime_dfilter(edt, cf->rfcode);
|
|
|
|
tap_queue_init(edt);
|
|
|
|
/* We only need the columns if we're printing packet info but we're
|
|
*not* verbose; in verbose mode, we print the protocol tree, not
|
|
the protocol summary. */
|
|
epan_dissect_run(edt, pseudo_header, pd, &fdata,
|
|
(print_packet_info && !verbose) ? &cf->cinfo : NULL);
|
|
|
|
tap_push_tapped_queue(edt);
|
|
|
|
/* Run the read filter if we have one. */
|
|
if (cf->rfcode)
|
|
passed = dfilter_apply_edt(cf->rfcode, edt);
|
|
else
|
|
passed = TRUE;
|
|
} else {
|
|
/* We're not running a display filter and we're not printing any
|
|
packet information, so we don't need to do a dissection, and all
|
|
packets are processed. */
|
|
edt = NULL;
|
|
passed = TRUE;
|
|
}
|
|
|
|
if (passed) {
|
|
/* Count this packet. */
|
|
#ifdef HAVE_LIBPCAP
|
|
ld.packet_count++;
|
|
#endif
|
|
|
|
/* Process this packet. */
|
|
if (pdh != NULL) {
|
|
/* We're writing to a capture file; write this packet. */
|
|
if (!wtap_dump(pdh, whdr, pseudo_header, pd, err))
|
|
return FALSE;
|
|
/* Report packet capture count if not quiet */
|
|
if (!quiet && !print_packet_info) {
|
|
/* Don't print a packet count if we were asked not to with "-q"
|
|
or if we're also printing packet info. */
|
|
if (ld.packet_count != 0) {
|
|
fprintf(stderr, "\r%u ", ld.packet_count);
|
|
/* stderr could be line buffered */
|
|
fflush(stderr);
|
|
}
|
|
}
|
|
}
|
|
if (print_packet_info) {
|
|
/* We're printing packet information; print the information for
|
|
this packet. */
|
|
print_packet(cf, edt);
|
|
}
|
|
}
|
|
|
|
if (do_dissection) {
|
|
epan_dissect_free(edt);
|
|
clear_fdata(&fdata);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
show_capture_file_io_error(const char *fname, int err, gboolean is_close)
|
|
{
|
|
if (*fname == '\0')
|
|
fname = "stdout";
|
|
|
|
switch (err) {
|
|
|
|
case ENOSPC:
|
|
fprintf(stderr,
|
|
"tethereal: Not all the packets could be written to \"%s\" because there is "
|
|
"no space left on the file system.\n",
|
|
fname);
|
|
break;
|
|
|
|
#ifdef EDQUOT
|
|
case EDQUOT:
|
|
fprintf(stderr,
|
|
"tethereal: Not all the packets could be written to \"%s\" because you are "
|
|
"too close to, or over your disk quota.\n",
|
|
fname);
|
|
break;
|
|
#endif
|
|
|
|
case WTAP_ERR_CANT_CLOSE:
|
|
fprintf(stderr,
|
|
"tethereal: \"%s\" couldn't be closed for some unknown reason.\n",
|
|
fname);
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
fprintf(stderr,
|
|
"tethereal: Not all the packets could be written to \"%s\".\n",
|
|
fname);
|
|
break;
|
|
|
|
default:
|
|
if (is_close) {
|
|
fprintf(stderr,
|
|
"tethereal: \"%s\" could not be closed: %s.\n",
|
|
fname, wtap_strerror(err));
|
|
} else {
|
|
fprintf(stderr,
|
|
"tethereal: An error occurred while writing to \"%s\": %s.\n",
|
|
fname, wtap_strerror(err));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_packet(capture_file *cf, epan_dissect_t *edt)
|
|
{
|
|
print_args_t print_args;
|
|
int i;
|
|
|
|
print_args.to_file = TRUE;
|
|
print_args.format = print_format;
|
|
print_args.print_summary = !verbose;
|
|
print_args.print_hex = verbose && print_hex;
|
|
print_args.print_formfeed = FALSE;
|
|
print_args.print_dissections = verbose ? print_dissections_expanded : print_dissections_none;
|
|
|
|
/* init the packet range */
|
|
packet_range_init(&print_args.range);
|
|
|
|
if (verbose) {
|
|
/* Print the information in the protocol tree. */
|
|
proto_tree_print(&print_args, edt, stdout);
|
|
if (!print_hex) {
|
|
/* "print_hex_data()" will put out a leading blank line, as well
|
|
as a trailing one; print one here, to separate the packets,
|
|
only if "print_hex_data()" won't be called. */
|
|
printf("\n");
|
|
}
|
|
} else {
|
|
/* Just fill in the columns. */
|
|
epan_dissect_fill_in_columns(edt);
|
|
|
|
/* Now print them. */
|
|
for (i = 0; i < cf->cinfo.num_cols; i++) {
|
|
switch (cf->cinfo.col_fmt[i]) {
|
|
case COL_NUMBER:
|
|
/*
|
|
* Don't print this if we're doing a live capture from a network
|
|
* interface - if we're doing a live capture, you won't be
|
|
* able to look at the capture in the future (it's not being
|
|
* saved anywhere), so the frame numbers are unlikely to be
|
|
* useful.
|
|
*
|
|
* (XXX - it might be nice to be able to save and print at
|
|
* the same time, sort of like an "Update list of packets
|
|
* in real time" capture in Ethereal.)
|
|
*/
|
|
if (cf->iface != NULL)
|
|
continue;
|
|
printf("%3s", cf->cinfo.col_data[i]);
|
|
break;
|
|
|
|
case COL_CLS_TIME:
|
|
case COL_REL_TIME:
|
|
case COL_ABS_TIME:
|
|
case COL_ABS_DATE_TIME: /* XXX - wider */
|
|
printf("%10s", cf->cinfo.col_data[i]);
|
|
break;
|
|
|
|
case COL_DEF_SRC:
|
|
case COL_RES_SRC:
|
|
case COL_UNRES_SRC:
|
|
case COL_DEF_DL_SRC:
|
|
case COL_RES_DL_SRC:
|
|
case COL_UNRES_DL_SRC:
|
|
case COL_DEF_NET_SRC:
|
|
case COL_RES_NET_SRC:
|
|
case COL_UNRES_NET_SRC:
|
|
printf("%12s", cf->cinfo.col_data[i]);
|
|
break;
|
|
|
|
case COL_DEF_DST:
|
|
case COL_RES_DST:
|
|
case COL_UNRES_DST:
|
|
case COL_DEF_DL_DST:
|
|
case COL_RES_DL_DST:
|
|
case COL_UNRES_DL_DST:
|
|
case COL_DEF_NET_DST:
|
|
case COL_RES_NET_DST:
|
|
case COL_UNRES_NET_DST:
|
|
printf("%-12s", cf->cinfo.col_data[i]);
|
|
break;
|
|
|
|
default:
|
|
printf("%s", cf->cinfo.col_data[i]);
|
|
break;
|
|
}
|
|
if (i != cf->cinfo.num_cols - 1) {
|
|
/*
|
|
* This isn't the last column, so we need to print a
|
|
* separator between this column and the next.
|
|
*
|
|
* If we printed a network source and are printing a
|
|
* network destination of the same type next, separate
|
|
* them with "->"; if we printed a network destination
|
|
* and are printing a network source of the same type
|
|
* next, separate them with "<-"; otherwise separate them
|
|
* with a space.
|
|
*/
|
|
switch (cf->cinfo.col_fmt[i]) {
|
|
|
|
case COL_DEF_SRC:
|
|
case COL_RES_SRC:
|
|
case COL_UNRES_SRC:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_DST:
|
|
case COL_RES_DST:
|
|
case COL_UNRES_DST:
|
|
printf(" -> ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case COL_DEF_DL_SRC:
|
|
case COL_RES_DL_SRC:
|
|
case COL_UNRES_DL_SRC:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_DL_DST:
|
|
case COL_RES_DL_DST:
|
|
case COL_UNRES_DL_DST:
|
|
printf(" -> ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case COL_DEF_NET_SRC:
|
|
case COL_RES_NET_SRC:
|
|
case COL_UNRES_NET_SRC:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_NET_DST:
|
|
case COL_RES_NET_DST:
|
|
case COL_UNRES_NET_DST:
|
|
printf(" -> ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case COL_DEF_DST:
|
|
case COL_RES_DST:
|
|
case COL_UNRES_DST:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_SRC:
|
|
case COL_RES_SRC:
|
|
case COL_UNRES_SRC:
|
|
printf(" <- ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case COL_DEF_DL_DST:
|
|
case COL_RES_DL_DST:
|
|
case COL_UNRES_DL_DST:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_DL_SRC:
|
|
case COL_RES_DL_SRC:
|
|
case COL_UNRES_DL_SRC:
|
|
printf(" <- ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case COL_DEF_NET_DST:
|
|
case COL_RES_NET_DST:
|
|
case COL_UNRES_NET_DST:
|
|
switch (cf->cinfo.col_fmt[i + 1]) {
|
|
|
|
case COL_DEF_NET_SRC:
|
|
case COL_RES_NET_SRC:
|
|
case COL_UNRES_NET_SRC:
|
|
printf(" <- ");
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
putchar(' ');
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
putchar('\n');
|
|
}
|
|
if (print_hex) {
|
|
print_hex_data(stdout, print_args.format, edt);
|
|
putchar('\n');
|
|
}
|
|
|
|
/* The ANSI C standard does not appear to *require* that a line-buffered
|
|
stream be flushed to the host environment whenever a newline is
|
|
written, it just says that, on such a stream, characters "are
|
|
intended to be transmitted to or from the host environment as a
|
|
block when a new-line character is encountered".
|
|
|
|
The Visual C++ 6.0 C implementation doesn't do what is intended;
|
|
even if you set a stream to be line-buffered, it still doesn't
|
|
flush the buffer at the end of every line.
|
|
|
|
So, if the "-l" flag was specified, we flush the standard output
|
|
at the end of a packet. This will do the right thing if we're
|
|
printing packet summary lines, and, as we print the entire protocol
|
|
tree for a single packet without waiting for anything to happen,
|
|
it should be as good as line-buffered mode if we're printing
|
|
protocol trees. (The whole reason for the "-l" flag in either
|
|
tcpdump or Tethereal is to allow the output of a live capture to
|
|
be piped to a program or script and to have that script see the
|
|
information for the packet as soon as it's printed, rather than
|
|
having to wait until a standard I/O buffer fills up. */
|
|
if (line_buffered)
|
|
fflush(stdout);
|
|
|
|
if (ferror(stdout)) {
|
|
show_print_file_io_error(errno);
|
|
exit(2);
|
|
}
|
|
}
|
|
|
|
static void
|
|
show_print_file_io_error(int err)
|
|
{
|
|
switch (err) {
|
|
|
|
case ENOSPC:
|
|
fprintf(stderr,
|
|
"tethereal: Not all the packets could be printed because there is "
|
|
"no space left on the file system.\n");
|
|
break;
|
|
|
|
#ifdef EDQUOT
|
|
case EDQUOT:
|
|
fprintf(stderr,
|
|
"tethereal: Not all the packets could be printed because you are "
|
|
"too close to, or over your disk quota.\n");
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
fprintf(stderr,
|
|
"tethereal: An error occurred while printing packets: %s.\n",
|
|
strerror(err));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static char *
|
|
cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
|
|
int file_type)
|
|
{
|
|
char *errmsg;
|
|
static char errmsg_errno[1024+1];
|
|
|
|
if (err < 0) {
|
|
/* Wiretap error. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_NOT_REGULAR_FILE:
|
|
errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
|
|
break;
|
|
|
|
case WTAP_ERR_FILE_UNKNOWN_FORMAT:
|
|
/* Seen only when opening a capture file for reading. */
|
|
errmsg = "The file \"%s\" is not a capture file in a format Tethereal understands.";
|
|
break;
|
|
|
|
case WTAP_ERR_UNSUPPORTED:
|
|
/* Seen only when opening a capture file for reading. */
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" is not a capture file in a format Tethereal understands.\n"
|
|
"(%s)", err_info);
|
|
g_free(err_info);
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
|
|
case WTAP_ERR_CANT_WRITE_TO_PIPE:
|
|
/* Seen only when opening a capture file for writing. */
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" is a pipe, and %s capture files cannot be "
|
|
"written to a pipe.", wtap_file_type_string(file_type));
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
|
|
case WTAP_ERR_UNSUPPORTED_FILE_TYPE:
|
|
/* Seen only when opening a capture file for writing. */
|
|
errmsg = "Tethereal does not support writing capture files in that format.";
|
|
break;
|
|
|
|
case WTAP_ERR_UNSUPPORTED_ENCAP:
|
|
if (for_writing)
|
|
errmsg = "Tethereal cannot save this capture in that format.";
|
|
else {
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" is a capture for a network type that Tethereal doesn't support.\n"
|
|
"(%s)", err_info);
|
|
g_free(err_info);
|
|
errmsg = errmsg_errno;
|
|
}
|
|
break;
|
|
|
|
case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
|
|
if (for_writing)
|
|
errmsg = "Tethereal cannot save this capture in that format.";
|
|
else
|
|
errmsg = "The file \"%s\" is a capture for a network type that Tethereal doesn't support.";
|
|
break;
|
|
|
|
case WTAP_ERR_BAD_RECORD:
|
|
/* Seen only when opening a capture file for reading. */
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" appears to be damaged or corrupt.\n"
|
|
"(%s)", err_info);
|
|
g_free(err_info);
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
|
|
case WTAP_ERR_CANT_OPEN:
|
|
if (for_writing)
|
|
errmsg = "The file \"%s\" could not be created for some unknown reason.";
|
|
else
|
|
errmsg = "The file \"%s\" could not be opened for some unknown reason.";
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_READ:
|
|
errmsg = "The file \"%s\" appears to have been cut short"
|
|
" in the middle of a packet or other data.";
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
errmsg = "A full header couldn't be written to the file \"%s\".";
|
|
break;
|
|
|
|
default:
|
|
snprintf(errmsg_errno, sizeof(errmsg_errno),
|
|
"The file \"%%s\" could not be %s: %s.",
|
|
for_writing ? "created" : "opened",
|
|
wtap_strerror(err));
|
|
errmsg = errmsg_errno;
|
|
break;
|
|
}
|
|
} else
|
|
errmsg = file_open_error_message(err, for_writing);
|
|
return errmsg;
|
|
}
|
|
|
|
/*
|
|
* Open/create errors are reported with an console message in Tethereal.
|
|
*/
|
|
static void
|
|
open_failure_message(const char *filename, int err, gboolean for_writing)
|
|
{
|
|
fprintf(stderr, "tethereal: ");
|
|
fprintf(stderr, file_open_error_message(err, for_writing), filename);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
int
|
|
cf_open(char *fname, gboolean is_tempfile, capture_file *cf)
|
|
{
|
|
wtap *wth;
|
|
int err;
|
|
gchar *err_info;
|
|
char err_msg[2048+1];
|
|
|
|
wth = wtap_open_offline(fname, &err, &err_info, FALSE);
|
|
if (wth == NULL)
|
|
goto fail;
|
|
|
|
/* The open succeeded. Fill in the information for this file. */
|
|
|
|
/* Initialize all data structures used for dissection. */
|
|
init_dissection();
|
|
|
|
cf->wth = wth;
|
|
cf->filed = -1; /* not used, but set it anyway */
|
|
cf->f_len = 0; /* not used, but set it anyway */
|
|
|
|
/* Set the file name because we need it to set the follow stream filter.
|
|
XXX - is that still true? We need it for other reasons, though,
|
|
in any case. */
|
|
cf->filename = g_strdup(fname);
|
|
|
|
/* Indicate whether it's a permanent or temporary file. */
|
|
cf->is_tempfile = is_tempfile;
|
|
|
|
/* If it's a temporary capture buffer file, mark it as not saved. */
|
|
cf->user_saved = !is_tempfile;
|
|
|
|
cf->cd_t = wtap_file_type(cf->wth);
|
|
cf->count = 0;
|
|
cf->drops_known = FALSE;
|
|
cf->drops = 0;
|
|
cf->esec = 0;
|
|
cf->eusec = 0;
|
|
cf->snap = wtap_snapshot_length(cf->wth);
|
|
if (cf->snap == 0) {
|
|
/* Snapshot length not known. */
|
|
cf->has_snap = FALSE;
|
|
cf->snap = WTAP_MAX_PACKET_SIZE;
|
|
} else
|
|
cf->has_snap = TRUE;
|
|
firstsec = 0, firstusec = 0;
|
|
prevsec = 0, prevusec = 0;
|
|
|
|
return (0);
|
|
|
|
fail:
|
|
snprintf(err_msg, sizeof err_msg,
|
|
cf_open_error_message(err, err_info, FALSE, 0), fname);
|
|
fprintf(stderr, "tethereal: %s\n", err_msg);
|
|
return (err);
|
|
}
|
|
|
|
#ifdef HAVE_LIBPCAP
|
|
#ifndef _WIN32
|
|
/* Take care of byte order in the libpcap headers read from pipes.
|
|
* (function taken from wiretap/libpcap.c) */
|
|
static void
|
|
adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
|
|
{
|
|
if (ld->byte_swapped) {
|
|
/* Byte-swap the record header fields. */
|
|
rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
|
|
rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
|
|
rechdr->incl_len = BSWAP32(rechdr->incl_len);
|
|
rechdr->orig_len = BSWAP32(rechdr->orig_len);
|
|
}
|
|
|
|
/* In file format version 2.3, the "incl_len" and "orig_len" fields were
|
|
swapped, in order to match the BPF header layout.
|
|
|
|
Unfortunately, some files were, according to a comment in the "libpcap"
|
|
source, written with version 2.3 in their headers but without the
|
|
interchanged fields, so if "incl_len" is greater than "orig_len" - which
|
|
would make no sense - we assume that we need to swap them. */
|
|
if (hdr->version_major == 2 &&
|
|
(hdr->version_minor < 3 ||
|
|
(hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
|
|
guint32 temp;
|
|
|
|
temp = rechdr->orig_len;
|
|
rechdr->orig_len = rechdr->incl_len;
|
|
rechdr->incl_len = temp;
|
|
}
|
|
}
|
|
|
|
/* Mimic pcap_open_live() for pipe captures
|
|
* We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
|
|
* header.
|
|
* N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
|
|
* because we can't seek on pipes (see wiretap/libpcap.c for details) */
|
|
static int
|
|
pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
|
|
char *errmsg, int errmsgl)
|
|
{
|
|
struct stat pipe_stat;
|
|
int fd;
|
|
guint32 magic;
|
|
int b;
|
|
unsigned int bytes_read;
|
|
|
|
/*
|
|
* XXX Tethereal blocks until we return
|
|
*/
|
|
if (strcmp(pipename, "-") == 0)
|
|
fd = 0; /* read from stdin */
|
|
else {
|
|
if (stat(pipename, &pipe_stat) < 0) {
|
|
if (errno == ENOENT || errno == ENOTDIR)
|
|
ld->pipe_err = PIPNEXIST;
|
|
else {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated "
|
|
"due to error on pipe: %s", strerror(errno));
|
|
ld->pipe_err = PIPERR;
|
|
}
|
|
return -1;
|
|
}
|
|
if (! S_ISFIFO(pipe_stat.st_mode)) {
|
|
if (S_ISCHR(pipe_stat.st_mode)) {
|
|
/*
|
|
* Assume the user specified an interface on a system where
|
|
* interfaces are in /dev. Pretend we haven't seen it.
|
|
*/
|
|
ld->pipe_err = PIPNEXIST;
|
|
} else {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated because\n"
|
|
"\"%s\" is neither an interface nor a pipe", pipename);
|
|
ld->pipe_err = PIPERR;
|
|
}
|
|
return -1;
|
|
}
|
|
fd = open(pipename, O_RDONLY);
|
|
if (fd == -1) {
|
|
snprintf(errmsg, errmsgl,
|
|
"The capture session could not be initiated "
|
|
"due to error on pipe open: %s", strerror(errno));
|
|
ld->pipe_err = PIPERR;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
ld->from_pipe = TRUE;
|
|
|
|
/* read the pcap header */
|
|
bytes_read = 0;
|
|
while (bytes_read < sizeof magic) {
|
|
b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
snprintf(errmsg, errmsgl, "End of file on pipe during open");
|
|
else
|
|
snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
bytes_read += b;
|
|
}
|
|
|
|
switch (magic) {
|
|
case PCAP_MAGIC:
|
|
/* Host that wrote it has our byte order, and was running
|
|
a program using either standard or ss990417 libpcap. */
|
|
ld->byte_swapped = FALSE;
|
|
ld->modified = FALSE;
|
|
break;
|
|
case PCAP_MODIFIED_MAGIC:
|
|
/* Host that wrote it has our byte order, but was running
|
|
a program using either ss990915 or ss991029 libpcap. */
|
|
ld->byte_swapped = FALSE;
|
|
ld->modified = TRUE;
|
|
break;
|
|
case PCAP_SWAPPED_MAGIC:
|
|
/* Host that wrote it has a byte order opposite to ours,
|
|
and was running a program using either standard or
|
|
ss990417 libpcap. */
|
|
ld->byte_swapped = TRUE;
|
|
ld->modified = FALSE;
|
|
break;
|
|
case PCAP_SWAPPED_MODIFIED_MAGIC:
|
|
/* Host that wrote it out has a byte order opposite to
|
|
ours, and was running a program using either ss990915
|
|
or ss991029 libpcap. */
|
|
ld->byte_swapped = TRUE;
|
|
ld->modified = TRUE;
|
|
break;
|
|
default:
|
|
/* Not a "libpcap" type we know about. */
|
|
snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
|
|
goto error;
|
|
}
|
|
|
|
/* Read the rest of the header */
|
|
bytes_read = 0;
|
|
while (bytes_read < sizeof(struct pcap_hdr)) {
|
|
b = read(fd, ((char *)hdr)+bytes_read,
|
|
sizeof(struct pcap_hdr) - bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
snprintf(errmsg, errmsgl, "End of file on pipe during open");
|
|
else
|
|
snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
|
|
strerror(errno));
|
|
goto error;
|
|
}
|
|
bytes_read += b;
|
|
}
|
|
|
|
if (ld->byte_swapped) {
|
|
/* Byte-swap the header fields about which we care. */
|
|
hdr->version_major = BSWAP16(hdr->version_major);
|
|
hdr->version_minor = BSWAP16(hdr->version_minor);
|
|
hdr->snaplen = BSWAP32(hdr->snaplen);
|
|
hdr->network = BSWAP32(hdr->network);
|
|
}
|
|
|
|
if (hdr->version_major < 2) {
|
|
snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
|
|
goto error;
|
|
}
|
|
|
|
ld->pipe_state = STATE_EXPECT_REC_HDR;
|
|
ld->pipe_err = PIPOK;
|
|
return fd;
|
|
|
|
error:
|
|
ld->pipe_err = PIPERR;
|
|
close(fd);
|
|
return -1;
|
|
|
|
}
|
|
/* We read one record from the pipe, take care of byte order in the record
|
|
* header, write the record in the capture file, and update capture statistics. */
|
|
|
|
static int
|
|
pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
|
|
struct pcaprec_modified_hdr *rechdr, guchar *data,
|
|
char *errmsg, int errmsgl)
|
|
{
|
|
struct pcap_pkthdr phdr;
|
|
int b;
|
|
enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
|
|
PD_ERR } result;
|
|
|
|
switch (ld->pipe_state) {
|
|
|
|
case STATE_EXPECT_REC_HDR:
|
|
ld->bytes_to_read = ld->modified ?
|
|
sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
|
|
ld->bytes_read = 0;
|
|
ld->pipe_state = STATE_READ_REC_HDR;
|
|
/* Fall through */
|
|
|
|
case STATE_READ_REC_HDR:
|
|
b = read(fd, ((char *)rechdr)+ld->bytes_read,
|
|
ld->bytes_to_read - ld->bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
result = PD_PIPE_EOF;
|
|
else
|
|
result = PD_PIPE_ERR;
|
|
break;
|
|
}
|
|
if ((ld->bytes_read += b) < ld->bytes_to_read)
|
|
return 0;
|
|
result = PD_REC_HDR_READ;
|
|
break;
|
|
|
|
case STATE_EXPECT_DATA:
|
|
ld->bytes_read = 0;
|
|
ld->pipe_state = STATE_READ_DATA;
|
|
/* Fall through */
|
|
|
|
case STATE_READ_DATA:
|
|
b = read(fd, data+ld->bytes_read, rechdr->hdr.incl_len - ld->bytes_read);
|
|
if (b <= 0) {
|
|
if (b == 0)
|
|
result = PD_PIPE_EOF;
|
|
else
|
|
result = PD_PIPE_ERR;
|
|
break;
|
|
}
|
|
if ((ld->bytes_read += b) < rechdr->hdr.incl_len)
|
|
return 0;
|
|
result = PD_DATA_READ;
|
|
break;
|
|
|
|
default:
|
|
snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
|
|
result = PD_ERR;
|
|
|
|
} /* switch (ld->pipe_state) */
|
|
|
|
/*
|
|
* We've now read as much data as we were expecting, so process it.
|
|
*/
|
|
switch (result) {
|
|
|
|
case PD_REC_HDR_READ:
|
|
/* We've read the header. Take care of byte order. */
|
|
adjust_header(ld, hdr, &rechdr->hdr);
|
|
if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
|
|
snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
|
|
ld->packet_count+1, rechdr->hdr.incl_len);
|
|
break;
|
|
}
|
|
ld->pipe_state = STATE_EXPECT_DATA;
|
|
return 0;
|
|
|
|
case PD_DATA_READ:
|
|
/* Fill in a "struct pcap_pkthdr", and process the packet. */
|
|
phdr.ts.tv_sec = rechdr->hdr.ts_sec;
|
|
phdr.ts.tv_usec = rechdr->hdr.ts_usec;
|
|
phdr.caplen = rechdr->hdr.incl_len;
|
|
phdr.len = rechdr->hdr.orig_len;
|
|
|
|
capture_pcap_cb((guchar *)ld, &phdr, data);
|
|
|
|
ld->pipe_state = STATE_EXPECT_REC_HDR;
|
|
return 1;
|
|
|
|
case PD_PIPE_EOF:
|
|
ld->pipe_err = PIPEOF;
|
|
return -1;
|
|
|
|
case PD_PIPE_ERR:
|
|
snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
|
|
strerror(errno));
|
|
/* Fall through */
|
|
case PD_ERR:
|
|
break;
|
|
}
|
|
|
|
ld->pipe_err = PIPERR;
|
|
/* Return here rather than inside the switch to prevent GCC warning */
|
|
return -1;
|
|
}
|
|
#endif /* _WIN32 */
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* General errors are reported with an console message in Tethereal.
|
|
*/
|
|
static void
|
|
failure_message(const char *msg_format, va_list ap)
|
|
{
|
|
fprintf(stderr, "tethereal: ");
|
|
vfprintf(stderr, msg_format, ap);
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
/*
|
|
* Read errors are reported with an console message in Tethereal.
|
|
*/
|
|
static void
|
|
read_failure_message(const char *filename, int err)
|
|
{
|
|
fprintf(stderr, "tethereal: An error occurred while reading from the file \"%s\": %s.\n",
|
|
filename, strerror(err));
|
|
}
|