![Guy Harris](/assets/img/avatar_default.png)
wtap-int.h, and change the unions of pointers to those private data structures into just void *'s. Have the generic wtap close routine free up the private data, rather than the type-specific close routine, just as the wtap_dumper close routine does for its private data. Get rid of close routines that don't do anything any more. svn path=/trunk/; revision=32015
657 lines
19 KiB
C
657 lines
19 KiB
C
/* etherpeek.c
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* Routines for opening EtherPeek and AiroPeek (and TokenPeek?) V5, V6,
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* and V7 files
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* Copyright (c) 2001, Daniel Thompson <d.thompson@gmx.net>
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*
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* $Id$
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "etherpeek.h"
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/* CREDITS
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*
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* This file decoder could not have been writen without examining how
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* tcptrace (http://www.tcptrace.org/) handles EtherPeek files.
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*/
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/*
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* NOTE: it says "etherpeek" because the first files seen that use this
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* format were EtherPeek files; however, AiroPeek files using it have
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* also been seen, and I suspect TokenPeek uses it as well.
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*/
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/* master header */
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typedef struct etherpeek_master_header {
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guint8 version;
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guint8 status;
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} etherpeek_master_header_t;
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#define ETHERPEEK_MASTER_HDR_SIZE 2
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/* secondary header (V5,V6,V7) */
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typedef struct etherpeek_v567_header {
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guint32 filelength;
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guint32 numPackets;
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guint32 timeDate;
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guint32 timeStart;
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guint32 timeStop;
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guint32 mediaType; /* Media Type Ethernet=0 Token Ring = 1 */
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guint32 physMedium; /* Physical Medium native=0 802.1=1 */
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guint32 appVers; /* App Version Number Maj.Min.Bug.Build */
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guint32 linkSpeed; /* Link Speed Bits/sec */
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guint32 reserved[3];
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} etherpeek_v567_header_t;
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#define ETHERPEEK_V567_HDR_SIZE 48
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/* full header */
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typedef struct etherpeek_header {
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etherpeek_master_header_t master;
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union {
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etherpeek_v567_header_t v567;
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} secondary;
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} etherpeek_header_t;
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/*
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* Packet header (V5, V6).
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*
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* NOTE: the time stamp, although it's a 32-bit number, is only aligned
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* on a 16-bit boundary. (Does this date back to 68K Macs? The 68000
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* only required 16-bit alignment of 32-bit quantities, as did the 68010,
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* and the 68020/68030/68040 required no alignment.)
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*
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* As such, we cannot declare this as a C structure, as compilers on
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* most platforms will put 2 bytes of padding before the time stamp to
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* align it on a 32-bit boundary.
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*
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* So, instead, we #define numbers as the offsets of the fields.
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*/
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#define ETHERPEEK_V56_LENGTH_OFFSET 0
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#define ETHERPEEK_V56_SLICE_LENGTH_OFFSET 2
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#define ETHERPEEK_V56_FLAGS_OFFSET 4
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#define ETHERPEEK_V56_STATUS_OFFSET 5
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#define ETHERPEEK_V56_TIMESTAMP_OFFSET 6
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#define ETHERPEEK_V56_DESTNUM_OFFSET 10
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#define ETHERPEEK_V56_SRCNUM_OFFSET 12
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#define ETHERPEEK_V56_PROTONUM_OFFSET 14
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#define ETHERPEEK_V56_PROTOSTR_OFFSET 16
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#define ETHERPEEK_V56_FILTERNUM_OFFSET 24
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#define ETHERPEEK_V56_PKT_SIZE 26
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/* 64-bit time in micro seconds from the (Mac) epoch */
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typedef struct etherpeek_utime {
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guint32 upper;
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guint32 lower;
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} etherpeek_utime;
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/*
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* Packet header (V7).
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*
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* This doesn't have the same alignment problem, but we do it with
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* #defines anyway.
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*/
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#define ETHERPEEK_V7_PROTONUM_OFFSET 0
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#define ETHERPEEK_V7_LENGTH_OFFSET 2
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#define ETHERPEEK_V7_SLICE_LENGTH_OFFSET 4
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#define ETHERPEEK_V7_FLAGS_OFFSET 6
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#define ETHERPEEK_V7_STATUS_OFFSET 7
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#define ETHERPEEK_V7_TIMESTAMP_OFFSET 8
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#define ETHERPEEK_V7_PKT_SIZE 16
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/*
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* AiroPeek radio information, at the beginning of every packet.
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*/
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typedef struct {
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guint8 data_rate;
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guint8 channel;
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guint8 signal_level;
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guint8 unused;
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} airopeek_radio_hdr_t;
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typedef struct etherpeek_encap_lookup {
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guint16 protoNum;
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int encap;
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} etherpeek_encap_lookup_t;
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static const unsigned int mac2unix = 2082844800u;
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static const etherpeek_encap_lookup_t etherpeek_encap[] = {
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{ 1400, WTAP_ENCAP_ETHERNET }
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};
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#define NUM_ETHERPEEK_ENCAPS \
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(sizeof (etherpeek_encap) / sizeof (etherpeek_encap[0]))
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typedef struct {
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struct timeval reference_time;
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} etherpeek_t;
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static gboolean etherpeek_read_v7(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean etherpeek_seek_read_v7(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
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int *err, gchar **err_info);
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static void etherpeek_fill_pseudo_header_v7(
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union wtap_pseudo_header *pseudo_header, airopeek_radio_hdr_t *radio_hdr);
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static gboolean etherpeek_read_v56(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean etherpeek_seek_read_v56(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
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int *err, gchar **err_info);
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int etherpeek_open(wtap *wth, int *err, gchar **err_info _U_)
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{
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etherpeek_header_t ep_hdr;
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struct timeval reference_time;
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int file_encap;
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etherpeek_t *etherpeek;
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/* EtherPeek files do not start with a magic value large enough
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* to be unique; hence we use the following algorithm to determine
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* the type of an unknown file:
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* - populate the master header and reject file if there is no match
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* - populate the secondary header and check that the reserved space
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* is zero, and check some other fields; this isn't perfect,
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* and we may have to add more checks at some point.
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*/
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g_assert(sizeof(ep_hdr.master) == ETHERPEEK_MASTER_HDR_SIZE);
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wtap_file_read_unknown_bytes(
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&ep_hdr.master, sizeof(ep_hdr.master), wth->fh, err);
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wth->data_offset += sizeof(ep_hdr.master);
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/*
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* It appears that EtherHelp (a free application from WildPackets
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* that did blind capture, saving to a file, so that you could
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* give the resulting file to somebody with EtherPeek) saved
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* captures in EtherPeek format except that it ORed the 0x80
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* bit on in the version number.
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*
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* We therefore strip off the 0x80 bit in the version number.
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* Perhaps there's some reason to care whether the capture
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* came from EtherHelp; if we discover one, we should check
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* that bit.
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*/
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ep_hdr.master.version &= ~0x80;
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/* switch on the file version */
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switch (ep_hdr.master.version) {
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case 5:
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case 6:
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case 7:
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/* get the secondary header */
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g_assert(sizeof(ep_hdr.secondary.v567) ==
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ETHERPEEK_V567_HDR_SIZE);
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wtap_file_read_unknown_bytes(
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&ep_hdr.secondary.v567,
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sizeof(ep_hdr.secondary.v567), wth->fh, err);
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wth->data_offset += sizeof(ep_hdr.secondary.v567);
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if ((0 != ep_hdr.secondary.v567.reserved[0]) ||
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(0 != ep_hdr.secondary.v567.reserved[1]) ||
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(0 != ep_hdr.secondary.v567.reserved[2])) {
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/* still unknown */
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return 0;
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}
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/*
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* Check the mediaType and physMedium fields.
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* We assume it's not an EtherPeek/TokenPeek/AiroPeek
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* file if these aren't values we know, rather than
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* reporting them as invalid *Peek files, as, given
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* the lack of a magic number, we need all the checks
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* we can get.
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*/
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ep_hdr.secondary.v567.mediaType =
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g_ntohl(ep_hdr.secondary.v567.mediaType);
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ep_hdr.secondary.v567.physMedium =
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g_ntohl(ep_hdr.secondary.v567.physMedium);
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switch (ep_hdr.secondary.v567.physMedium) {
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case 0:
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/*
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* "Native" format, presumably meaning
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* Ethernet or Token Ring.
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*/
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switch (ep_hdr.secondary.v567.mediaType) {
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case 0:
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file_encap = WTAP_ENCAP_ETHERNET;
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break;
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case 1:
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file_encap = WTAP_ENCAP_TOKEN_RING;
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break;
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default:
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/*
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* Assume this isn't a *Peek file.
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*/
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return 0;
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}
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break;
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case 1:
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switch (ep_hdr.secondary.v567.mediaType) {
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case 0:
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/*
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* 802.11, with a private header giving
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* some radio information. Presumably
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* this is from AiroPeek.
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*
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* We supply the private header as
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* the WTAP_ENCAP_IEEE_802_11_WITH_RADIO
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* pseudo-header, rather than as frame
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* data.
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*/
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file_encap = WTAP_ENCAP_IEEE_802_11_WITH_RADIO;
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break;
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default:
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/*
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* Assume this isn't a *Peek file.
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*/
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return 0;
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}
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break;
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default:
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/*
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* Assume this isn't a *Peek file.
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*/
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return 0;
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}
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/*
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* Assume this is a V5, V6 or V7 *Peek file, and byte
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* swap the rest of the fields in the secondary header.
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*
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* XXX - we could check the file length if the file were
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* uncompressed, but it might be compressed.
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*/
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ep_hdr.secondary.v567.filelength =
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g_ntohl(ep_hdr.secondary.v567.filelength);
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ep_hdr.secondary.v567.numPackets =
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g_ntohl(ep_hdr.secondary.v567.numPackets);
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ep_hdr.secondary.v567.timeDate =
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g_ntohl(ep_hdr.secondary.v567.timeDate);
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ep_hdr.secondary.v567.timeStart =
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g_ntohl(ep_hdr.secondary.v567.timeStart);
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ep_hdr.secondary.v567.timeStop =
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g_ntohl(ep_hdr.secondary.v567.timeStop);
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ep_hdr.secondary.v567.appVers =
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g_ntohl(ep_hdr.secondary.v567.appVers);
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ep_hdr.secondary.v567.linkSpeed =
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g_ntohl(ep_hdr.secondary.v567.linkSpeed);
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/* Get the reference time as a "struct timeval" */
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reference_time.tv_sec =
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ep_hdr.secondary.v567.timeDate - mac2unix;
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reference_time.tv_usec = 0;
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break;
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default:
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/*
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* Assume this isn't a *Peek file.
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*/
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return 0;
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}
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/*
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* This is an EtherPeek (or TokenPeek or AiroPeek?) file.
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*
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* At this point we have recognised the file type and have populated
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* the whole ep_hdr structure in host byte order.
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*/
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etherpeek = (etherpeek_t *)g_malloc(sizeof(etherpeek_t));
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wth->priv = (void *)etherpeek;
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etherpeek->reference_time = reference_time;
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switch (ep_hdr.master.version) {
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case 5:
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case 6:
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wth->file_type = WTAP_FILE_ETHERPEEK_V56;
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/*
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* XXX - can we get the file encapsulation from the
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* header in the same way we do for V7 files?
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*/
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wth->file_encap = WTAP_ENCAP_PER_PACKET;
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wth->subtype_read = etherpeek_read_v56;
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wth->subtype_seek_read = etherpeek_seek_read_v56;
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break;
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case 7:
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wth->file_type = WTAP_FILE_ETHERPEEK_V7;
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wth->file_encap = file_encap;
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wth->subtype_read = etherpeek_read_v7;
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wth->subtype_seek_read = etherpeek_seek_read_v7;
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break;
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default:
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/* this is impossible */
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g_assert_not_reached();
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}
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wth->snapshot_length = 0; /* not available in header */
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wth->tsprecision = WTAP_FILE_TSPREC_USEC;
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return 1;
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}
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static gboolean etherpeek_read_v7(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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guchar ep_pkt[ETHERPEEK_V7_PKT_SIZE];
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guint16 protoNum;
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guint16 length;
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guint16 sliceLength;
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guint8 flags;
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guint8 status;
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guint64 timestamp;
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time_t tsecs;
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guint32 tusecs;
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airopeek_radio_hdr_t radio_hdr;
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*data_offset = wth->data_offset;
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wtap_file_read_expected_bytes(ep_pkt, sizeof(ep_pkt), wth->fh, err);
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wth->data_offset += sizeof(ep_pkt);
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/* Extract the fields from the packet */
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protoNum = pntohs(&ep_pkt[ETHERPEEK_V7_PROTONUM_OFFSET]);
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length = pntohs(&ep_pkt[ETHERPEEK_V7_LENGTH_OFFSET]);
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sliceLength = pntohs(&ep_pkt[ETHERPEEK_V7_SLICE_LENGTH_OFFSET]);
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flags = ep_pkt[ETHERPEEK_V7_FLAGS_OFFSET];
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status = ep_pkt[ETHERPEEK_V7_STATUS_OFFSET];
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timestamp = pntohll(&ep_pkt[ETHERPEEK_V7_TIMESTAMP_OFFSET]);
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/* force sliceLength to be the actual length of the packet */
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if (0 == sliceLength) {
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sliceLength = length;
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}
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/* fill in packet header length values before slicelength may be
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adjusted */
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wth->phdr.len = length;
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wth->phdr.caplen = sliceLength;
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if (sliceLength % 2) /* packets are padded to an even length */
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sliceLength++;
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switch (wth->file_encap) {
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case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
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/*
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* The first 4 bytes of the packet data are radio
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* information (including a reserved byte).
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*/
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if (sliceLength < 4) {
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/*
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* We don't *have* 4 bytes of packet data.
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*/
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup("etherpeek: packet not long enough for 802.11 radio header");
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return FALSE;
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}
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wtap_file_read_expected_bytes(&radio_hdr, 4, wth->fh, err);
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/*
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* We don't treat the radio information as packet data.
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*/
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sliceLength -= 4;
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wth->phdr.len -= 4;
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wth->phdr.caplen -= 4;
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wth->data_offset += 4;
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etherpeek_fill_pseudo_header_v7(&wth->pseudo_header,
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&radio_hdr);
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break;
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case WTAP_ENCAP_ETHERNET:
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/* XXX - it appears that if the low-order bit of
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"status" is 0, there's an FCS in this frame,
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and if it's 1, there's 4 bytes of 0. */
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wth->pseudo_header.eth.fcs_len = (status & 0x01) ? 0 : 4;
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break;
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}
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/* read the frame data */
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buffer_assure_space(wth->frame_buffer, sliceLength);
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wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer),
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sliceLength, wth->fh, err);
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wth->data_offset += sliceLength;
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/* fill in packet header values */
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tsecs = (time_t) (timestamp/1000000);
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tusecs = (guint32) (timestamp - tsecs*1000000);
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wth->phdr.ts.secs = tsecs - mac2unix;
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wth->phdr.ts.nsecs = tusecs * 1000;
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if (wth->file_encap == WTAP_ENCAP_IEEE_802_11_WITH_RADIO) {
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/*
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* The last 4 bytes appear to be random data - the length
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* might include the FCS - so we reduce the length by 4.
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*
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* Or maybe this is just the same kind of random 4 bytes
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* of junk at the end you get in Wireless Sniffer
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* captures.
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*/
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wth->phdr.len -= 4;
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wth->phdr.caplen -= 4;
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}
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return TRUE;
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}
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static gboolean
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etherpeek_seek_read_v7(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
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int *err, gchar **err_info)
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{
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guchar ep_pkt[ETHERPEEK_V7_PKT_SIZE];
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guint8 status;
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airopeek_radio_hdr_t radio_hdr;
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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|
/* Read the packet header. */
|
|
wtap_file_read_expected_bytes(ep_pkt, sizeof(ep_pkt), wth->random_fh,
|
|
err);
|
|
status = ep_pkt[ETHERPEEK_V7_STATUS_OFFSET];
|
|
|
|
switch (wth->file_encap) {
|
|
|
|
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
|
|
/*
|
|
* The first 4 bytes of the packet data are radio
|
|
* information (including a reserved byte).
|
|
*/
|
|
if (length < 4) {
|
|
/*
|
|
* We don't *have* 4 bytes of packet data.
|
|
*/
|
|
*err = WTAP_ERR_BAD_RECORD;
|
|
*err_info = g_strdup("etherpeek: packet not long enough for 802.11 radio header");
|
|
return FALSE;
|
|
}
|
|
wtap_file_read_expected_bytes(&radio_hdr, 4, wth->random_fh,
|
|
err);
|
|
|
|
etherpeek_fill_pseudo_header_v7(pseudo_header,
|
|
&radio_hdr);
|
|
break;
|
|
|
|
case WTAP_ENCAP_ETHERNET:
|
|
/* XXX - it appears that if the low-order bit of
|
|
"status" is 0, there's an FCS in this frame,
|
|
and if it's 1, there's 4 bytes of 0. */
|
|
pseudo_header->eth.fcs_len = (status & 0x01) ? 0 : 4;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* XXX - should "errno" be set in "wtap_file_read_expected_bytes()"?
|
|
*/
|
|
errno = WTAP_ERR_CANT_READ;
|
|
wtap_file_read_expected_bytes(pd, length, wth->random_fh, err);
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
etherpeek_fill_pseudo_header_v7(union wtap_pseudo_header *pseudo_header,
|
|
airopeek_radio_hdr_t *radio_hdr)
|
|
{
|
|
pseudo_header->ieee_802_11.fcs_len = 0; /* no FCS */
|
|
pseudo_header->ieee_802_11.channel = radio_hdr->channel;
|
|
pseudo_header->ieee_802_11.data_rate = radio_hdr->data_rate;
|
|
pseudo_header->ieee_802_11.signal_level = radio_hdr->signal_level;
|
|
}
|
|
|
|
static gboolean etherpeek_read_v56(wtap *wth, int *err, gchar **err_info _U_,
|
|
gint64 *data_offset)
|
|
{
|
|
etherpeek_t *etherpeek = (etherpeek_t *)wth->priv;
|
|
guchar ep_pkt[ETHERPEEK_V56_PKT_SIZE];
|
|
guint16 length;
|
|
guint16 sliceLength;
|
|
guint8 flags;
|
|
guint8 status;
|
|
guint32 timestamp;
|
|
guint16 destNum;
|
|
guint16 srcNum;
|
|
guint16 protoNum;
|
|
char protoStr[8];
|
|
unsigned int i;
|
|
|
|
/*
|
|
* XXX - in order to figure out whether this packet is an
|
|
* Ethernet packet or not, we have to look at the packet
|
|
* header, so we have to remember the address of the header,
|
|
* not the address of the data, for random access.
|
|
*
|
|
* If we can determine that from the file header, rather than
|
|
* the packet header, we can remember the offset of the data,
|
|
* and not have the seek_read routine read the header.
|
|
*/
|
|
*data_offset = wth->data_offset;
|
|
|
|
wtap_file_read_expected_bytes(ep_pkt, sizeof(ep_pkt), wth->fh, err);
|
|
wth->data_offset += sizeof(ep_pkt);
|
|
|
|
/* Extract the fields from the packet */
|
|
length = pntohs(&ep_pkt[ETHERPEEK_V56_LENGTH_OFFSET]);
|
|
sliceLength = pntohs(&ep_pkt[ETHERPEEK_V56_SLICE_LENGTH_OFFSET]);
|
|
flags = ep_pkt[ETHERPEEK_V56_FLAGS_OFFSET];
|
|
status = ep_pkt[ETHERPEEK_V56_STATUS_OFFSET];
|
|
timestamp = pntohl(&ep_pkt[ETHERPEEK_V56_TIMESTAMP_OFFSET]);
|
|
destNum = pntohs(&ep_pkt[ETHERPEEK_V56_DESTNUM_OFFSET]);
|
|
srcNum = pntohs(&ep_pkt[ETHERPEEK_V56_SRCNUM_OFFSET]);
|
|
protoNum = pntohs(&ep_pkt[ETHERPEEK_V56_PROTONUM_OFFSET]);
|
|
memcpy(protoStr, &ep_pkt[ETHERPEEK_V56_PROTOSTR_OFFSET],
|
|
sizeof protoStr);
|
|
|
|
/*
|
|
* XXX - is the captured packet data padded to a multiple
|
|
* of 2 bytes?
|
|
*/
|
|
|
|
/* force sliceLength to be the actual length of the packet */
|
|
if (0 == sliceLength) {
|
|
sliceLength = length;
|
|
}
|
|
|
|
/* read the frame data */
|
|
buffer_assure_space(wth->frame_buffer, sliceLength);
|
|
wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer),
|
|
sliceLength, wth->fh, err);
|
|
wth->data_offset += sliceLength;
|
|
|
|
/* fill in packet header values */
|
|
wth->phdr.len = length;
|
|
wth->phdr.caplen = sliceLength;
|
|
/* timestamp is in milliseconds since reference_time */
|
|
wth->phdr.ts.secs = etherpeek->reference_time.tv_sec
|
|
+ (timestamp / 1000);
|
|
wth->phdr.ts.nsecs = 1000 * (timestamp % 1000) * 1000;
|
|
|
|
wth->phdr.pkt_encap = WTAP_ENCAP_UNKNOWN;
|
|
for (i=0; i<NUM_ETHERPEEK_ENCAPS; i++) {
|
|
if (etherpeek_encap[i].protoNum == protoNum) {
|
|
wth->phdr.pkt_encap = etherpeek_encap[i].encap;
|
|
}
|
|
}
|
|
|
|
switch (wth->phdr.pkt_encap) {
|
|
|
|
case WTAP_ENCAP_ETHERNET:
|
|
/* We assume there's no FCS in this frame. */
|
|
wth->pseudo_header.eth.fcs_len = 0;
|
|
break;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
etherpeek_seek_read_v56(wtap *wth, gint64 seek_off,
|
|
union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
|
|
int *err, gchar **err_info _U_)
|
|
{
|
|
guchar ep_pkt[ETHERPEEK_V56_PKT_SIZE];
|
|
int pkt_encap;
|
|
guint16 protoNum;
|
|
unsigned int i;
|
|
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
return FALSE;
|
|
|
|
wtap_file_read_expected_bytes(ep_pkt, sizeof(ep_pkt), wth->random_fh,
|
|
err);
|
|
|
|
protoNum = pntohs(&ep_pkt[ETHERPEEK_V56_PROTONUM_OFFSET]);
|
|
pkt_encap = WTAP_ENCAP_UNKNOWN;
|
|
for (i=0; i<NUM_ETHERPEEK_ENCAPS; i++) {
|
|
if (etherpeek_encap[i].protoNum == protoNum) {
|
|
pkt_encap = etherpeek_encap[i].encap;
|
|
}
|
|
}
|
|
|
|
switch (pkt_encap) {
|
|
|
|
case WTAP_ENCAP_ETHERNET:
|
|
/* We assume there's no FCS in this frame. */
|
|
pseudo_header->eth.fcs_len = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* XXX - should "errno" be set in "wtap_file_read_expected_bytes()"?
|
|
*/
|
|
errno = WTAP_ERR_CANT_READ;
|
|
wtap_file_read_expected_bytes(pd, length, wth->random_fh, err);
|
|
return TRUE;
|
|
}
|