296 lines
8.4 KiB
C
296 lines
8.4 KiB
C
/* netxray.c
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*
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* $Id: netxray.c,v 1.14 1999/09/22 01:26:48 ashokn Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.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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*/
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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 <errno.h>
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#include <time.h>
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#include "file.h"
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#include "wtap.h"
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#include "netxray.h"
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#include "buffer.h"
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/* Capture file header, *including* magic number, is padded to 128 bytes. */
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#define CAPTUREFILE_HEADER_SIZE 128
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/* Magic number in NetXRay files. */
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static const char netxray_magic[] = { /* magic header */
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'X', 'C', 'P', '\0'
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};
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/* NetXRay file header (minus magic number). */
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struct netxray_hdr {
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char version[8]; /* version number */
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guint32 start_time; /* UNIX time when capture started */
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guint32 xxx[2]; /* unknown */
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guint32 start_offset; /* offset of first packet in capture */
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guint32 end_offset; /* offset after last packet in capture */
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guint32 xxy[3]; /* unknown */
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guint16 network; /* datalink type */
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guint8 xxz[6];
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guint32 timelo; /* lower 32 bits of time stamp of capture start */
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guint32 timehi; /* upper 32 bits of time stamp of capture start */
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/*
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* XXX - other stuff.
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*/
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};
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/* Version number strings. */
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static const char vers_1_0[] = {
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'0', '0', '1', '.', '0', '0', '0', '\0'
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};
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static const char vers_1_1[] = {
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'0', '0', '1', '.', '1', '0', '0', '\0'
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};
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static const char vers_2_001[] = {
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'0', '0', '2', '.', '0', '0', '1', '\0'
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};
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/* NetXRay 1.x data record format - followed by frame data. */
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struct netxrayrec_1_x_hdr {
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guint32 timelo; /* lower 32 bits of time stamp */
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guint32 timehi; /* upper 32 bits of time stamp */
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guint16 orig_len; /* packet length */
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guint16 incl_len; /* capture length */
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guint32 xxx[4]; /* unknown */
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};
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/* NetXRay 2.x data record format - followed by frame data. */
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struct netxrayrec_2_x_hdr {
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guint32 timelo; /* lower 32 bits of time stamp */
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guint32 timehi; /* upper 32 bits of time stamp */
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guint16 orig_len; /* packet length */
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guint16 incl_len; /* capture length */
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guint32 xxx[7]; /* unknown */
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};
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static int netxray_read(wtap *wth, int *err);
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int netxray_open(wtap *wth, int *err)
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{
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int bytes_read;
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char magic[sizeof netxray_magic];
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struct netxray_hdr hdr;
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double timeunit;
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int version_major;
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int file_type;
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double t;
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static const int netxray_encap[] = {
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_TR,
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WTAP_ENCAP_FDDI_BITSWAPPED,
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WTAP_ENCAP_UNKNOWN, /* WAN */
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WTAP_ENCAP_UNKNOWN, /* LocalTalk */
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WTAP_ENCAP_UNKNOWN, /* "DIX" - should not occur */
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WTAP_ENCAP_UNKNOWN, /* ARCNET raw */
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WTAP_ENCAP_UNKNOWN, /* ARCNET 878.2 */
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WTAP_ENCAP_UNKNOWN, /* ATM */
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WTAP_ENCAP_UNKNOWN, /* Wireless WAN */
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WTAP_ENCAP_UNKNOWN /* IrDA */
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};
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#define NUM_NETXRAY_ENCAPS (sizeof netxray_encap / sizeof netxray_encap[0])
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/* Read in the string that should be at the start of a NetXRay
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* file */
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file_seek(wth->fh, 0, SEEK_SET);
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wth->data_offset = 0;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(magic, 1, sizeof magic, wth->fh);
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if (bytes_read != sizeof magic) {
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if (file_error(wth->fh)) {
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*err = errno;
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return -1;
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}
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return 0;
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}
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wth->data_offset += sizeof magic;
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if (memcmp(magic, netxray_magic, sizeof netxray_magic) != 0) {
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return 0;
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}
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/* Read the rest of the header. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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if (file_error(wth->fh)) {
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*err = errno;
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return -1;
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}
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return 0;
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}
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wth->data_offset += sizeof hdr;
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/* It appears that version 1.1 files (as produced by Windows
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* Sniffer Pro 2.0.01) have the time stamp in microseconds,
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* rather than the milliseconds version 1.0 files appear to have.
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*
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* It also appears that version 2.001 files (as produced by
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* Windows(?) Sniffer Pro 2.50.05) have per-packet headers with
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* some extra fields. */
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if (memcmp(hdr.version, vers_1_0, sizeof vers_1_0) == 0) {
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timeunit = 1000.0;
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version_major = 1;
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file_type = WTAP_FILE_NETXRAY_1_0;
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} else if (memcmp(hdr.version, vers_1_1, sizeof vers_1_1) == 0) {
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timeunit = 1000000.0;
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version_major = 1;
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file_type = WTAP_FILE_NETXRAY_1_1;
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} else if (memcmp(hdr.version, vers_2_001, sizeof vers_2_001) == 0) {
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timeunit = 1000000.0;
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version_major = 2;
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file_type = WTAP_FILE_NETXRAY_2_001;
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} else {
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g_message("netxray: version \"%.8s\" unsupported", hdr.version);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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hdr.network = pletohs(&hdr.network);
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if (hdr.network >= NUM_NETXRAY_ENCAPS
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|| netxray_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
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g_message("netxray: network type %u unknown or unsupported",
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hdr.network);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/* This is a netxray file */
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wth->file_type = file_type;
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wth->capture.netxray = g_malloc(sizeof(netxray_t));
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wth->subtype_read = netxray_read;
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wth->file_encap = netxray_encap[hdr.network];
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wth->snapshot_length = 16384; /* XXX - not available in header */
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wth->capture.netxray->start_time = pletohl(&hdr.start_time);
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wth->capture.netxray->timeunit = timeunit;
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t = (double)pletohl(&hdr.timelo)
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+ (double)pletohl(&hdr.timehi)*4294967296.0;
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t = t/timeunit;
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wth->capture.netxray->start_timestamp = t;
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wth->capture.netxray->version_major = version_major;
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/*wth->frame_number = 0;*/
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/*wth->file_byte_offset = 0x10b;*/
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/* Remember the offset after the last packet in the capture (which
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* isn't necessarily the last packet in the file), as it appears
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* there's sometimes crud after it. */
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wth->capture.netxray->wrapped = 0;
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wth->capture.netxray->end_offset = pletohl(&hdr.end_offset);
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/* Seek to the beginning of the data records. */
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file_seek(wth->fh, pletohl(&hdr.start_offset), SEEK_SET);
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wth->data_offset = pletohl(&hdr.start_offset);
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return 1;
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}
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/* Read the next packet */
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static int netxray_read(wtap *wth, int *err)
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{
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guint32 packet_size;
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int bytes_read;
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union {
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struct netxrayrec_1_x_hdr hdr_1_x;
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struct netxrayrec_2_x_hdr hdr_2_x;
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} hdr;
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int hdr_size = 0;
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int data_offset;
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double t;
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reread:
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/* Have we reached the end of the packet data? */
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if (wth->data_offset == wth->capture.netxray->end_offset) {
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/* Yes. */
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return 0;
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}
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/* Read record header. */
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switch (wth->capture.netxray->version_major) {
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case 1:
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hdr_size = sizeof (struct netxrayrec_1_x_hdr);
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break;
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case 2:
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hdr_size = sizeof (struct netxrayrec_2_x_hdr);
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break;
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}
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, hdr_size, wth->fh);
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if (bytes_read != hdr_size) {
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if (file_error(wth->fh)) {
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*err = errno;
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return -1;
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}
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if (bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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/* We're at EOF. Wrap? */
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if (!wth->capture.netxray->wrapped) {
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/* Yes. Remember that we did. */
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wth->capture.netxray->wrapped = 1;
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file_seek(wth->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET);
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wth->data_offset = CAPTUREFILE_HEADER_SIZE;
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goto reread;
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}
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/* We've already wrapped - don't wrap again. */
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return 0;
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}
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wth->data_offset += hdr_size;
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packet_size = pletohs(&hdr.hdr_1_x.incl_len);
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buffer_assure_space(wth->frame_buffer, packet_size);
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data_offset = wth->data_offset;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(buffer_start_ptr(wth->frame_buffer), 1,
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packet_size, wth->fh);
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if (bytes_read != packet_size) {
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if (file_error(wth->fh))
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*err = errno;
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else
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*err = WTAP_ERR_SHORT_READ;
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return -1;
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}
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wth->data_offset += packet_size;
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t = (double)pletohl(&hdr.hdr_1_x.timelo)
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+ (double)pletohl(&hdr.hdr_1_x.timehi)*4294967296.0;
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t /= wth->capture.netxray->timeunit;
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t -= wth->capture.netxray->start_timestamp;
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wth->phdr.ts.tv_sec = wth->capture.netxray->start_time + (long)t;
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wth->phdr.ts.tv_usec = (unsigned long)((t-(double)(unsigned long)(t))
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*1.0e6);
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wth->phdr.caplen = packet_size;
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wth->phdr.len = pletohs(&hdr.hdr_1_x.orig_len);
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wth->phdr.pkt_encap = wth->file_encap;
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return data_offset;
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}
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