320 lines
8.2 KiB
C
320 lines
8.2 KiB
C
/* nettl.c
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*
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* $Id: nettl.c,v 1.18 2000/11/17 21:00:40 gram Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
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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 <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "nettl.h"
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static u_char nettl_magic_hpux9[12] = {
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0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xD0, 0x00
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};
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static u_char nettl_magic_hpux10[12] = {
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0x54, 0x52, 0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
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};
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/* HP nettl record header for the SX25L2 subsystem - The FCS is not included in the file. */
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struct nettlrec_sx25l2_hdr {
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guint8 xxa[8];
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guint8 from_dce;
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guint8 xxb[55];
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guint8 length[2];
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guint8 length2[2]; /* don't know which one is captured length / real length */
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guint8 xxc[4];
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guint8 sec[4];
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guint8 usec[4];
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guint8 xxd[4];
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};
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/* HP nettl record header for the NS_LS_IP subsystem */
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/* This also works for BASE100 and GSC100BT */
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struct nettlrec_ns_ls_ip_hdr {
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guint8 xxa[28];
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guint8 length[4];
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guint8 length2[4]; /* don't know which one is captured length / real length */
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guint8 sec[4];
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guint8 usec[4];
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guint8 xxb[16];
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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 gboolean nettl_read(wtap *wth, int *err, int *data_offset);
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static int nettl_seek_read(wtap *wth, int seek_off,
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union wtap_pseudo_header *pseudo_header, u_char *pd, int length);
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static int nettl_read_rec_header(wtap *wth, FILE_T fh,
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struct wtap_pkthdr *phdr, union wtap_pseudo_header *pseudo_header,
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int *err);
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static int nettl_read_rec_data(FILE_T fh, u_char *pd, int length, int *err);
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static void nettl_close(wtap *wth);
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int nettl_open(wtap *wth, int *err)
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{
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char magic[12], os_vers[2];
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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, 12, wth->fh);
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if (bytes_read != 12) {
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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_hpux9, 12) &&
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memcmp(magic, nettl_magic_hpux10, 12)) {
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return 0;
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}
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file_seek(wth->fh, 0x63, SEEK_SET);
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wth->data_offset = 0x63;
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bytes_read = file_read(os_vers, 1, 2, wth->fh);
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if (bytes_read != 2) {
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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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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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if (os_vers[0] == '1' && os_vers[1] == '1')
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wth->capture.nettl->is_hpux_11 = TRUE;
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else
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wth->capture.nettl->is_hpux_11 = FALSE;
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wth->subtype_read = nettl_read;
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wth->subtype_seek_read = nettl_seek_read;
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wth->subtype_close = nettl_close;
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wth->snapshot_length = 16384; /* not available in header, only in frame */
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return 1;
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}
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/* Read the next packet */
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static gboolean nettl_read(wtap *wth, int *err, int *data_offset)
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{
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int ret;
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/* Read record header. */
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*data_offset = wth->data_offset;
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ret = nettl_read_rec_header(wth, wth->fh, &wth->phdr, &wth->pseudo_header,
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err);
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if (ret <= 0) {
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/* Read error or EOF */
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return FALSE;
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}
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wth->data_offset += ret;
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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, wth->phdr.caplen);
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if (nettl_read_rec_data(wth->fh, buffer_start_ptr(wth->frame_buffer),
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wth->phdr.caplen, err) < 0)
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return FALSE; /* Read error */
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wth->data_offset += wth->phdr.caplen;
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return TRUE;
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}
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static int
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nettl_seek_read(wtap *wth, int seek_off,
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union wtap_pseudo_header *pseudo_header, u_char *pd, int length)
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{
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int ret;
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int err; /* XXX - return this */
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struct wtap_pkthdr phdr;
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file_seek(wth->random_fh, seek_off, SEEK_SET);
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/* Read record header. */
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ret = nettl_read_rec_header(wth, wth->random_fh, &phdr, pseudo_header,
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&err);
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if (ret <= 0) {
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/* Read error or EOF */
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return ret;
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}
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/*
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* Read the packet data.
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*/
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return nettl_read_rec_data(wth->random_fh, pd, length, &err);
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}
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static int
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nettl_read_rec_header(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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union wtap_pseudo_header *pseudo_header, int *err)
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{
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int bytes_read;
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struct nettlrec_sx25l2_hdr lapb_hdr;
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struct nettlrec_ns_ls_ip_hdr ip_hdr;
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guint16 length;
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int offset = 0;
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guint8 encap[4];
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guint8 dummy[4];
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(encap, 1, 4, fh);
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if (bytes_read != 4) {
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*err = file_error(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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offset += 4;
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switch (encap[3]) {
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case NETTL_SUBSYS_BASE100 :
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case NETTL_SUBSYS_GSC100BT :
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case NETTL_SUBSYS_NS_LS_IP :
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if (encap[3] == NETTL_SUBSYS_NS_LS_IP) {
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phdr->pkt_encap = WTAP_ENCAP_RAW_IP;
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} else {
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wth->file_encap = WTAP_ENCAP_ETHERNET;
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phdr->pkt_encap = WTAP_ENCAP_ETHERNET;
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}
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bytes_read = file_read(&ip_hdr, 1, sizeof ip_hdr, fh);
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if (bytes_read != sizeof ip_hdr) {
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*err = file_error(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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offset += sizeof ip_hdr;
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/* The packet header in HP-UX 11 nettl traces is 4 octets longer than
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* HP-UX 9 and 10 */
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if (wth->capture.nettl->is_hpux_11) {
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bytes_read = file_read(dummy, 1, 4, fh);
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if (bytes_read != 4) {
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*err = file_error(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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offset += 4;
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}
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length = pntohl(&ip_hdr.length);
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if (length <= 0) return 0;
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phdr->len = length;
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phdr->caplen = length;
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phdr->ts.tv_sec = pntohl(&ip_hdr.sec);
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phdr->ts.tv_usec = pntohl(&ip_hdr.usec);
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break;
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case NETTL_SUBSYS_SX25L2 :
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phdr->pkt_encap = WTAP_ENCAP_LAPB;
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bytes_read = file_read(&lapb_hdr, 1, sizeof lapb_hdr, fh);
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if (bytes_read != sizeof lapb_hdr) {
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*err = file_error(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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offset += sizeof lapb_hdr;
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if (wth->capture.nettl->is_hpux_11) {
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bytes_read = file_read(dummy, 1, 4, fh);
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if (bytes_read != 4) {
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*err = file_error(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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offset += 4;
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}
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length = pntohs(&lapb_hdr.length);
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if (length <= 0) return 0;
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phdr->len = length;
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phdr->caplen = length;
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phdr->ts.tv_sec = pntohl(&lapb_hdr.sec);
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phdr->ts.tv_usec = pntohl(&lapb_hdr.usec);
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pseudo_header->x25.flags = (lapb_hdr.from_dce & 0x20 ? 0x80 : 0x00);
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break;
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default:
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g_message("nettl: network type %u unknown or unsupported",
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encap[3]);
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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return -1;
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}
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return offset;
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}
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static int
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nettl_read_rec_data(FILE_T fh, u_char *pd, int length, int *err)
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{
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int bytes_read;
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bytes_read = file_read(pd, 1, length, fh);
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if (bytes_read != length) {
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*err = file_error(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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return 0;
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}
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static void nettl_close(wtap *wth)
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{
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g_free(wth->capture.nettl);
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}
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