147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/* nettl.c
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*
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* $Id: nettl.c,v 1.2 1999/10/31 19:23:37 guy 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 "wtap.h"
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#include "file.h"
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#include "buffer.h"
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#include "nettl.h"
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static char nettl_magic[5] = {
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0x54, 0x52, 0x00, 0x64, 0x00
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};
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/* HP nettl record header - The FCS is not included in the file. */
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struct nettlrec_hdr {
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char xxa[12];
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char from_dce;
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char xxb[55];
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guint16 length;
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guint16 length2; /* don't know which one is captured length / real length */
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char xxc[4];
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char sec[4];
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char usec[4];
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char xxd[4];
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};
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/* header is followed by data and once again the total length (2 bytes) ! */
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static int nettl_read(wtap *wth, int *err);
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int nettl_open(wtap *wth, int *err)
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{
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char magic[5];
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int bytes_read;
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/* Read in the string that should be at the start of a HP file */
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file_seek(wth->fh, 0, SEEK_SET);
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(magic, 1, 5, wth->fh);
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if (bytes_read != 5) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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if (memcmp(magic, nettl_magic, 5)) {
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return 0;
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}
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file_seek(wth->fh, 0x80, SEEK_SET);
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wth->data_offset = 0x80;
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/* This is an nettl file */
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wth->file_type = WTAP_FILE_NETTL;
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wth->capture.nettl = g_malloc(sizeof(nettl_t));
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wth->subtype_read = nettl_read;
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wth->snapshot_length = 16384; /* not available in header, only in frame */
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wth->capture.nettl->start = 0;
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wth->file_encap = WTAP_ENCAP_LAPB;
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return 1;
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}
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/* Read the next packet */
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static int nettl_read(wtap *wth, int *err)
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{
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int bytes_read;
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struct nettlrec_hdr hdr;
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guint16 length;
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int data_offset;
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/* Read record 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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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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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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return 0;
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}
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wth->data_offset += sizeof hdr;
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length = pntohs(&hdr.length);
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if (length <= 0) return 0;
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wth->phdr.len = length;
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wth->phdr.caplen = length;
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wth->phdr.ts.tv_sec = pntohl(&hdr.sec);
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wth->phdr.ts.tv_usec = pntohl(&hdr.usec);
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if (wth->capture.nettl->start == 0)
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wth->capture.nettl->start = wth->phdr.ts.tv_sec;
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wth->phdr.pseudo_header.x25.flags = (hdr.from_dce & 0x20 ? 0x80 : 0x00);
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/*
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* Read the packet data.
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*/
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buffer_assure_space(wth->frame_buffer, length);
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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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length, wth->fh);
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if (bytes_read != length) {
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*err = file_error(wth->fh);
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if (*err == 0)
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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 += length;
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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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