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wireshark/wiretap/nettl.c

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/* nettl.c
*
* $Id: nettl.c,v 1.20 2001/10/04 08:30:36 guy Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@xiexie.org>
*
* 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 <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "buffer.h"
#include "nettl.h"
static u_char nettl_magic_hpux9[12] = {
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xD0, 0x00
};
static u_char nettl_magic_hpux10[12] = {
0x54, 0x52, 0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
};
/* HP nettl record header for the SX25L2 subsystem - The FCS is not included in the file. */
struct nettlrec_sx25l2_hdr {
guint8 xxa[8];
guint8 from_dce;
guint8 xxb[55];
guint8 length[2];
guint8 length2[2]; /* don't know which one is captured length / real length */
guint8 xxc[4];
guint8 sec[4];
guint8 usec[4];
guint8 xxd[4];
};
/* HP nettl record header for the NS_LS_IP subsystem */
/* This also works for BASE100 and GSC100BT */
struct nettlrec_ns_ls_ip_hdr {
guint8 xxa[28];
guint8 length[4];
guint8 length2[4]; /* don't know which one is captured length / real length */
guint8 sec[4];
guint8 usec[4];
guint8 xxb[16];
};
/* header is followed by data and once again the total length (2 bytes) ! */
static gboolean nettl_read(wtap *wth, int *err, long *data_offset);
static int nettl_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, u_char *pd, int length);
static int nettl_read_rec_header(wtap *wth, FILE_T fh,
struct wtap_pkthdr *phdr, union wtap_pseudo_header *pseudo_header,
int *err);
static int nettl_read_rec_data(FILE_T fh, u_char *pd, int length, int *err);
static void nettl_close(wtap *wth);
int nettl_open(wtap *wth, int *err)
{
char magic[12], os_vers[2];
int bytes_read;
/* Read in the string that should be at the start of a HP file */
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, 0x63, SEEK_SET);
wth->data_offset = 0x63;
bytes_read = file_read(os_vers, 1, 2, wth->fh);
if (bytes_read != 2) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
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));
if (os_vers[0] == '1' && os_vers[1] == '1')
wth->capture.nettl->is_hpux_11 = TRUE;
else
wth->capture.nettl->is_hpux_11 = FALSE;
wth->subtype_read = nettl_read;
wth->subtype_seek_read = nettl_seek_read;
wth->subtype_close = nettl_close;
wth->snapshot_length = 16384; /* not available in header, only in frame */
return 1;
}
/* Read the next packet */
static gboolean nettl_read(wtap *wth, int *err, long *data_offset)
{
int ret;
/* Read record header. */
*data_offset = wth->data_offset;
ret = nettl_read_rec_header(wth, wth->fh, &wth->phdr, &wth->pseudo_header,
err);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
wth->data_offset += ret;
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, wth->phdr.caplen);
if (nettl_read_rec_data(wth->fh, buffer_start_ptr(wth->frame_buffer),
wth->phdr.caplen, err) < 0)
return FALSE; /* Read error */
wth->data_offset += wth->phdr.caplen;
return TRUE;
}
static int
nettl_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, u_char *pd, int length)
{
int ret;
int err; /* XXX - return this */
struct wtap_pkthdr phdr;
file_seek(wth->random_fh, seek_off, SEEK_SET);
/* Read record header. */
ret = nettl_read_rec_header(wth, wth->random_fh, &phdr, pseudo_header,
&err);
if (ret <= 0) {
/* Read error or EOF */
return ret;
}
/*
* Read the packet data.
*/
return nettl_read_rec_data(wth->random_fh, pd, length, &err);
}
static int
nettl_read_rec_header(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
union wtap_pseudo_header *pseudo_header, int *err)
{
int bytes_read;
struct nettlrec_sx25l2_hdr lapb_hdr;
struct nettlrec_ns_ls_ip_hdr ip_hdr;
guint16 length;
int offset = 0;
guint8 encap[4];
guint8 dummy[4];
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(encap, 1, 4, fh);
if (bytes_read != 4) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += 4;
switch (encap[3]) {
case NETTL_SUBSYS_BASE100 :
case NETTL_SUBSYS_GSC100BT :
case NETTL_SUBSYS_NS_LS_IP :
if (encap[3] == NETTL_SUBSYS_NS_LS_IP) {
phdr->pkt_encap = WTAP_ENCAP_RAW_IP;
} else {
wth->file_encap = WTAP_ENCAP_ETHERNET;
phdr->pkt_encap = WTAP_ENCAP_ETHERNET;
}
bytes_read = file_read(&ip_hdr, 1, sizeof ip_hdr, fh);
if (bytes_read != sizeof ip_hdr) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += sizeof ip_hdr;
/* The packet header in HP-UX 11 nettl traces is 4 octets longer than
* HP-UX 9 and 10 */
if (wth->capture.nettl->is_hpux_11) {
bytes_read = file_read(dummy, 1, 4, fh);
if (bytes_read != 4) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += 4;
}
length = pntohl(&ip_hdr.length);
if (length <= 0) return 0;
phdr->len = length;
phdr->caplen = length;
phdr->ts.tv_sec = pntohl(&ip_hdr.sec);
phdr->ts.tv_usec = pntohl(&ip_hdr.usec);
break;
case NETTL_SUBSYS_SX25L2 :
phdr->pkt_encap = WTAP_ENCAP_LAPB;
bytes_read = file_read(&lapb_hdr, 1, sizeof lapb_hdr, fh);
if (bytes_read != sizeof lapb_hdr) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += sizeof lapb_hdr;
if (wth->capture.nettl->is_hpux_11) {
bytes_read = file_read(dummy, 1, 4, fh);
if (bytes_read != 4) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += 4;
}
length = pntohs(&lapb_hdr.length);
if (length <= 0) return 0;
phdr->len = length;
phdr->caplen = length;
phdr->ts.tv_sec = pntohl(&lapb_hdr.sec);
phdr->ts.tv_usec = pntohl(&lapb_hdr.usec);
pseudo_header->x25.flags = (lapb_hdr.from_dce & 0x20 ? 0x80 : 0x00);
break;
default:
g_message("nettl: network type %u unknown or unsupported",
encap[3]);
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
return -1;
}
return offset;
}
static int
nettl_read_rec_data(FILE_T fh, u_char *pd, int length, int *err)
{
int bytes_read;
bytes_read = file_read(pd, 1, length, fh);
if (bytes_read != length) {
*err = file_error(fh);
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
static void nettl_close(wtap *wth)
{
g_free(wth->capture.nettl);
}
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