forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
reading the capture file. Have callers of "wtap_snapshot_length()" treat a value of 0 as "unknown", and default to WTAP_MAX_PACKET_SIZE (so that, when writing a capture file in a format that *does* store the snapshot length, we can at least put *something* in the file). If we don't know the snapshot length of the current capture file, don't display a value in the summary window. Don't use "cfile.snap" as the snapshot length option when capturing - doing so causes Ethereal to default, when capturing, to the snapshot length of the last capture file that you read in, rather than to the snapshot length of the last capture you did (or the initial default of "no snapshot length"). Redo the "Capture Options" dialog box to group options into sections with frames around them, and add units to the snapshot length, maximum file size, and capture duration options, as per a suggestion by Ulf Lamping. Also add units to the capture count option. Make the snapshot length, capture count, maximum file size, and capture duration options into a combination of a check box and a spin button. If the check box is not checked, the limit in question is inactive (snapshot length of 65535, no max packet count, no max file size, no max capture duration); if it's checked, the spinbox specifies the limit. Default all of the check boxes to "not checked" and all of the spin boxes to small values. Use "gtk_toggle_button_get_active()" rather than directly fetching the state of a check box. svn path=/trunk/; revision=4709
319 lines
8.1 KiB
C
319 lines
8.1 KiB
C
/* nettl.c
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*
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* $Id: nettl.c,v 1.22 2002/02/08 10:07:40 guy Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.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 <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, long *data_offset);
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static int nettl_seek_read(wtap *wth, long 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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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 = 0; /* 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, long *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, long 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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