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/* nettl.c
*
* $Id: nettl.c,v 1.4 2000/01/20 17:13:42 oabad 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.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include "wtap.h"
#include "file_wrappers.h"
#include "buffer.h"
#include "nettl.h"
static char nettl_magic_hpux9[12] = {
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xD0, 0x00
};
static char nettl_magic_hpux10[12] = {
0x54, 0x52, 0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
};
/* HP nettl record header - The FCS is not included in the file. */
struct nettlrec_hdr {
char xxa[12];
char from_dce;
char xxb[55];
guint16 length;
guint16 length2; /* don't know which one is captured length / real length */
char xxc[4];
char sec[4];
char usec[4];
char xxd[4];
};
/* header is followed by data and once again the total length (2 bytes) ! */
static int nettl_read(wtap *wth, int *err);
int nettl_open(wtap *wth, int *err)
{
char magic[12];
int bytes_read;
/* Read in the string that should be at the start of a HP file */
file_seek(wth->fh, 0, SEEK_SET);
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(magic, 1, 12, wth->fh);
if (bytes_read != 12) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
if (memcmp(magic, nettl_magic_hpux9, 12) &&
memcmp(magic, nettl_magic_hpux10, 12)) {
return 0;
}
file_seek(wth->fh, 0x80, SEEK_SET);
wth->data_offset = 0x80;
/* This is an nettl file */
wth->file_type = WTAP_FILE_NETTL;
wth->capture.nettl = g_malloc(sizeof(nettl_t));
wth->subtype_read = nettl_read;
wth->snapshot_length = 16384; /* not available in header, only in frame */
wth->capture.nettl->start = 0;
wth->file_encap = WTAP_ENCAP_LAPB;
return 1;
}
/* Read the next packet */
static int nettl_read(wtap *wth, int *err)
{
int bytes_read;
struct nettlrec_hdr hdr;
guint16 length;
int data_offset;
/* Read record header. */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
if (bytes_read != sizeof hdr) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
wth->data_offset += sizeof hdr;
length = pntohs(&hdr.length);
if (length <= 0) return 0;
wth->phdr.len = length;
wth->phdr.caplen = length;
wth->phdr.ts.tv_sec = pntohl(&hdr.sec);
wth->phdr.ts.tv_usec = pntohl(&hdr.usec);
if (wth->capture.nettl->start == 0)
wth->capture.nettl->start = wth->phdr.ts.tv_sec;
wth->phdr.pseudo_header.x25.flags = (hdr.from_dce & 0x20 ? 0x80 : 0x00);
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, length);
data_offset = wth->data_offset;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(buffer_start_ptr(wth->frame_buffer), 1,
length, wth->fh);
if (bytes_read != length) {
*err = file_error(wth->fh);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return -1;
}
wth->data_offset += length;
wth->phdr.pkt_encap = wth->file_encap;
return data_offset;
}
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