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/* netxray.c
*
* $Id: netxray.c,v 1.1 1999/02/20 06:49:26 guy Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* 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.
*
*/
#include <stdlib.h>
#include <time.h>
#include "wtap.h"
#include "netxray.h"
/* Capture file header, *including* magic number, is padded to 128 bytes. */
#define CAPTUREFILE_HEADER_SIZE 128
/* Magic number in NetXRay files. */
static const char netxray_magic[] = { /* magic header */
'X', 'C', 'P', '\0'
};
/* NetXRay file header (minus magic number). */
struct netxray_hdr {
char version[8]; /* version number */
guint32 xxx[10]; /* unknown */
guint32 timelo; /* lower 32 bits of time stamp */
guint32 timehi; /* upper 32 bits of time stamp */
/*
* XXX - other stuff.
*/
};
/* Version number strings. */
static const char vers_1_0[] = {
'0', '0', '1', '.', '0', '0', '0', '\0'
};
static const char vers_1_1[] = {
'0', '0', '1', '.', '1', '0', '0', '\0'
};
/* NetXRay data record format - followed by frame data. */
struct netxrayrec_hdr {
guint32 timelo; /* lower 32 bits of time stamp */
guint32 timehi; /* upper 32 bits of time stamp */
guint16 orig_len; /* packet length */
guint16 incl_len; /* capture length */
guint32 xxx[4]; /* unknown */
};
/* Returns WTAP_FILE_NETXRAY on success, WTAP_FILE_UNKNOWN on failure */
int netxray_open(wtap *wth)
{
int bytes_read;
char magic[sizeof netxray_magic];
struct netxray_hdr hdr;
double timeunit;
double t;
/* Read in the string that should be at the start of a NetXRay
* file */
fseek(wth->fh, 0, SEEK_SET);
bytes_read = fread(magic, 1, sizeof magic, wth->fh);
if (bytes_read != sizeof magic) {
return WTAP_FILE_UNKNOWN;
}
if (memcmp(magic, netxray_magic, sizeof netxray_magic) != 0) {
return WTAP_FILE_UNKNOWN;
}
/* Read the rest of the header. */
bytes_read = fread(&hdr, 1, sizeof hdr, wth->fh);
if (bytes_read != sizeof hdr) {
return WTAP_FILE_UNKNOWN;
}
/* It appears that version 1.1 files (as produced by Windows
* Sniffer Pro) have the time stamp in microseconds, rather
* than the milliseconds version 1.0 files appear to have. */
if (memcmp(hdr.version, vers_1_0, sizeof vers_1_0) == 0) {
timeunit = 1000.0;
} else if (memcmp(hdr.version, vers_1_1, sizeof vers_1_1) == 0) {
timeunit = 1000000.0;
} else {
return WTAP_FILE_UNKNOWN;
}
/* This is a netxray file */
wth->capture.netxray = g_malloc(sizeof(netxray_t));
wth->subtype_read = netxray_read;
wth->encapsulation = WTAP_ENCAP_ETHERNET; /* XXX - where is it? */
wth->snapshot_length = 16384; /* XXX - not available in header */
wth->capture.netxray->timeunit = timeunit;
t = (double)pletohl(&hdr.timelo)
+ (double)pletohl(&hdr.timehi)*4294967296.0;
t = t/timeunit;
wth->capture.netxray->starttime = t;
/*wth->frame_number = 0;*/
/*wth->file_byte_offset = 0x10b;*/
/* Seek to the beginning of the data records. */
fseek(wth->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET);
return WTAP_FILE_NETXRAY;
}
/* Read the next packet */
int netxray_read(wtap *wth)
{
int packet_size;
int bytes_read;
struct netxrayrec_hdr hdr;
int data_offset;
double t;
/* Read record header. */
bytes_read = fread(&hdr, 1, sizeof hdr, wth->fh);
if (bytes_read != sizeof hdr) {
if (bytes_read != 0) {
g_error("netxray_read: not enough packet header data (%d bytes)",
bytes_read);
return -1;
}
return 0;
}
data_offset += sizeof hdr;
packet_size = pletohs(&hdr.incl_len);
buffer_assure_space(&wth->frame_buffer, packet_size);
data_offset = ftell(wth->fh);
bytes_read = fread(buffer_start_ptr(&wth->frame_buffer), 1,
packet_size, wth->fh);
if (bytes_read != packet_size) {
if (ferror(wth->fh)) {
g_error("netxray_read: fread for data: read error\n");
} else {
g_error("netxray_read: fread for data: %d bytes out of %d",
bytes_read, packet_size);
}
return -1;
}
/* XXX - this isn't the actual date/time the packet was captured,
* but at least it gives you the right relative time stamps. */
t = (double)pletohl(&hdr.timelo)
+ (double)pletohl(&hdr.timehi)*4294967296.0;
t /= wth->capture.netxray->timeunit;
t -= wth->capture.netxray->starttime;
wth->phdr.ts.tv_sec = (long)t;
wth->phdr.ts.tv_usec = (unsigned long)((t-(double)(wth->phdr.ts.tv_sec))
*1.0e6);
wth->phdr.caplen = packet_size;
wth->phdr.len = pletohs(&hdr.orig_len);
wth->phdr.pkt_encap = wth->encapsulation;
return data_offset;
}
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