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/* etherpeek.c
* Routines for opening etherpeek files
* Copyright (c) 2001, Daniel Thompson <d.thompson@gmx.net>
*
* $Id: etherpeek.c,v 1.3 2001/03/10 06:33:57 guy Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "buffer.h"
#include "etherpeek.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
/* CREDITS
*
* This file decoder could not have been writen without examining how
* tcptrace (http://www.tcptrace.org/) handles etherpeek files.
*/
/* master header */
typedef struct etherpeek_master_header {
guint8 version;
guint8 status;
} etherpeek_master_header_t;
#define ETHERPEEK_MASTER_HDR_SIZE 2
/* secondary header (Mac V5,V6,V7) */
typedef struct etherpeek_m567_header {
guint32 filelength;
guint32 numPackets;
guint32 timeDate;
guint32 timeStart;
guint32 timeStop;
guint32 reserved[7];
} etherpeek_m567_header_t;
#define ETHERPEEK_M567_HDR_SIZE 48
/* full header */
typedef struct etherpeek_header {
etherpeek_master_header_t master;
union {
etherpeek_m567_header_t m567;
} secondary;
} etherpeek_header_t;
/* packet header (Mac V5, V6) */
typedef struct etherpeek_m56_packet {
guint16 length;
guint16 sliceLength;
guint8 flags;
guint8 status;
guint32 timestamp;
guint16 destNum;
guint16 srcNum;
guint16 protoNum;
char protoStr[8];
} etherpeek_m56_packet_t;
#define ETHERPEEK_M56_PKT_SIZE 24
/* 64-bit time in micro seconds from the (Mac) epoch */
typedef struct etherpeek_utime {
guint32 upper;
guint32 lower;
} etherpeek_utime;
/* packet header (Mac V7) */
typedef struct etherpeek_m7_packet {
guint16 protoNum;
guint16 length;
guint16 sliceLength;
guint8 flags;
guint8 status;
etherpeek_utime
timestamp;
} etherpeek_m7_packet_t;
#define ETHERPEEK_M7_PKT_SIZE 16
typedef struct etherpeek_encap_lookup {
guint16 protoNum;
int encap;
} etherpeek_encap_lookup_t;
static const unsigned int mac2unix = 2082844800u;
static const etherpeek_encap_lookup_t etherpeek_encap[] = {
{ 1400, WTAP_ENCAP_ETHERNET }
};
#define NUM_ETHERPEEK_ENCAPS \
(sizeof (etherpeek_encap) / sizeof (etherpeek_encap[0]))
static gboolean etherpeek_read_m7(wtap *wth, int *err, int *data_offset);
static gboolean etherpeek_read_m56(wtap *wth, int *err, int *data_offset);
int etherpeek_open(wtap *wth, int *err)
{
etherpeek_header_t ep_hdr;
/* etherpeek files to not start with a magic value large enough
* to be unique hence we use the following algorithm to determine
* the type of an unknown file
* - populate the master header and reject file if there is no match
* - populate the secondary header and check that the reserved space
* is zero; there is an obvious flaw here so this algorithm will
* probably need to be revisiting when improving etherpeek
* support
*/
g_assert(sizeof(ep_hdr.master) == ETHERPEEK_MASTER_HDR_SIZE);
wtap_file_read_unknown_bytes(
&ep_hdr.master, sizeof(ep_hdr.master), wth->fh, err);
wth->data_offset += sizeof(ep_hdr.master);
/* switch on the file version */
switch (ep_hdr.master.version) {
case 5:
case 6:
case 7:
/* get the secondary header */
g_assert(sizeof(ep_hdr.secondary.m567) ==
ETHERPEEK_M567_HDR_SIZE);
wtap_file_read_unknown_bytes(
&ep_hdr.secondary.m567,
sizeof(ep_hdr.secondary.m567), wth->fh, err);
wth->data_offset += sizeof(ep_hdr.secondary.m567);
if ((0 != ep_hdr.secondary.m567.reserved[0]) ||
(0 != ep_hdr.secondary.m567.reserved[1]) ||
(0 != ep_hdr.secondary.m567.reserved[2]) ||
(0 != ep_hdr.secondary.m567.reserved[3])) {
/* still unknown */
return 0;
}
/* we have a match for a Mac V5, V6 or V7,
* so it is worth preforming byte swaps
*/
ep_hdr.secondary.m567.filelength =
ntohl(ep_hdr.secondary.m567.filelength);
ep_hdr.secondary.m567.numPackets =
ntohl(ep_hdr.secondary.m567.numPackets);
ep_hdr.secondary.m567.timeDate =
ntohl(ep_hdr.secondary.m567.timeDate);
ep_hdr.secondary.m567.timeStart =
ntohl(ep_hdr.secondary.m567.timeStart);
ep_hdr.secondary.m567.timeStop =
ntohl(ep_hdr.secondary.m567.timeStop);
/* populate the pseudo header */
wth->pseudo_header.etherpeek.reference_time.tv_sec =
ep_hdr.secondary.m567.timeDate - mac2unix;
wth->pseudo_header.etherpeek.reference_time.tv_usec =
0;
break;
default:
return 0;
}
/* at this point we have recognised the file type and have populated
* the whole ep_hdr structure in host byte order
*/
switch (ep_hdr.master.version) {
case 5:
case 6:
wth->file_type = WTAP_FILE_ETHERPEEK_MAC_V56;
wth->subtype_read = etherpeek_read_m56;
wth->subtype_seek_read = wtap_def_seek_read;
break;
case 7:
wth->file_type = WTAP_FILE_ETHERPEEK_MAC_V7;
wth->subtype_read = etherpeek_read_m7;
wth->subtype_seek_read = wtap_def_seek_read;
break;
default:
/* this is impossible */
g_assert_not_reached();
};
wth->file_encap = WTAP_ENCAP_PER_PACKET;
wth->snapshot_length = 16384; /* just guessing */
return 1;
}
static gboolean etherpeek_read_m7(wtap *wth, int *err, int *data_offset)
{
etherpeek_m7_packet_t ep_pkt;
double t;
int i;
g_assert(sizeof(ep_pkt) == ETHERPEEK_M7_PKT_SIZE);
wtap_file_read_expected_bytes(&ep_pkt, sizeof(ep_pkt), wth->fh, err);
wth->data_offset += sizeof(ep_pkt);
/* byte swaps */
ep_pkt.protoNum = ntohs(ep_pkt.protoNum);
ep_pkt.length = ntohs(ep_pkt.length);
ep_pkt.sliceLength = ntohs(ep_pkt.sliceLength);
ep_pkt.timestamp.upper = ntohl(ep_pkt.timestamp.upper);
ep_pkt.timestamp.lower = ntohl(ep_pkt.timestamp.lower);
/* force sliceLength to be the actual length of the packet */
if (0 == ep_pkt.sliceLength) {
ep_pkt.sliceLength = ep_pkt.length;
}
/* test for corrupt data */
if (ep_pkt.sliceLength > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_BAD_RECORD;
return FALSE;
}
*data_offset = wth->data_offset;
/* read the frame data */
buffer_assure_space(wth->frame_buffer, ep_pkt.sliceLength);
wtap_file_read_expected_bytes(buffer_start_ptr(wth->frame_buffer),
ep_pkt.sliceLength, wth->fh, err);
wth->data_offset += ep_pkt.sliceLength;
/* fill in packet header values */
wth->phdr.len = ep_pkt.length;
wth->phdr.caplen = ep_pkt.sliceLength;
t = (double) ep_pkt.timestamp.lower +
(double) ep_pkt.timestamp.upper * 4294967296.0;
t -= (double) mac2unix * 1000000.0;
wth->phdr.ts.tv_sec = (time_t) (t/1000000.0);
wth->phdr.ts.tv_usec = (guint32) (t - (double) wth->phdr.ts.tv_sec *
1000000.0);
wth->phdr.pkt_encap = WTAP_ENCAP_UNKNOWN;
for (i=0; i<NUM_ETHERPEEK_ENCAPS; i++) {
if (etherpeek_encap[i].protoNum == ep_pkt.protoNum) {
wth->phdr.pkt_encap = etherpeek_encap[i].encap;
}
}
return TRUE;
}
static gboolean etherpeek_read_m56(wtap *wth, int *err, int *data_offset)
{
etherpeek_m56_packet_t ep_pkt;
int i;
g_assert(sizeof(ep_pkt) == ETHERPEEK_M56_PKT_SIZE);
wtap_file_read_expected_bytes(&ep_pkt, sizeof(ep_pkt), wth->fh, err);
wth->data_offset += sizeof(ep_pkt);
/* byte swaps */
ep_pkt.length = ntohs(ep_pkt.length);
ep_pkt.sliceLength = ntohs(ep_pkt.sliceLength);
ep_pkt.timestamp = ntohl(ep_pkt.timestamp);
ep_pkt.destNum = ntohs(ep_pkt.destNum);
ep_pkt.srcNum = ntohs(ep_pkt.srcNum);
ep_pkt.protoNum = ntohs(ep_pkt.protoNum);
/* force sliceLength to be the actual length of the packet */
if (0 == ep_pkt.sliceLength) {
ep_pkt.sliceLength = ep_pkt.length;
}
/* test for corrupt data */
if (ep_pkt.sliceLength > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_BAD_RECORD;
return FALSE;
}
*data_offset = wth->data_offset;
/* fill in packet header values */
wth->phdr.len = ep_pkt.length;
wth->phdr.caplen = ep_pkt.sliceLength;
/* timestamp is in milliseconds since reference_time */
wth->phdr.ts.tv_sec = wth->pseudo_header.etherpeek.
reference_time.tv_sec + (ep_pkt.timestamp / 1000);
wth->phdr.ts.tv_usec = 1000 * (ep_pkt.timestamp % 1000);
wth->phdr.pkt_encap = WTAP_ENCAP_UNKNOWN;
for (i=0; i<NUM_ETHERPEEK_ENCAPS; i++) {
if (etherpeek_encap[i].protoNum == ep_pkt.protoNum) {
wth->phdr.pkt_encap = etherpeek_encap[i].encap;
}
}
return TRUE;
}
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