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
247 lines
6.7 KiB
C
247 lines
6.7 KiB
C
/* csids.c
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*
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* $Id: csids.c,v 1.9 2002/02/08 10:07:40 guy Exp $
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*
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* Copyright (c) 2000 by Mike Hall <mlh@io.com>
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* Copyright (c) 2000 by Cisco Systems
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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 "wtap-int.h"
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#include "buffer.h"
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#include "csids.h"
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#include "file_wrappers.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* This module reads the output from the Cisco Secure Intrustion Detection
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* System iplogging facility. The term iplogging is misleading since this
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* logger will only output TCP. There is no link layer information.
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* Packet format is 4 byte timestamp (seconds since epoch), and a 4 byte size
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* of data following for that packet.
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*
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* For a time there was an error in iplogging and the ip length, flags, and id
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* were byteswapped. We will check for this and handle it before handing to ethereal.
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*
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*/
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static gboolean csids_read(wtap *wth, int *err, long *data_offset);
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static int csids_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, guint8 *pd, int len);
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struct csids_header {
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guint32 seconds; /* seconds since epoch */
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guint16 zeropad; /* 2 byte zero'ed pads */
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guint16 caplen; /* the capture length */
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};
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/* XXX - return -1 on I/O error and actually do something with 'err'. */
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int csids_open(wtap *wth, int *err)
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{
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/* There is no file header. There is only a header for each packet
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* so we read a packet header and compare the caplen with iplen. They
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* should always be equal except with the wierd byteswap version.
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*
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* THIS IS BROKEN-- anytime the caplen is 0x0101 or 0x0202 up to 0x0505
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* this will byteswap it. I need to fix this. XXX --mlh
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*/
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int tmp,iplen,bytesRead;
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gboolean byteswap = FALSE;
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struct csids_header hdr;
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bytesRead=0;
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/* check the file to make sure it is a csids file. */
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bytesRead = file_read( &hdr, 1, sizeof( struct csids_header), wth->fh );
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if( bytesRead != sizeof( struct csids_header) ) {
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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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} else {
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return 0;
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}
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}
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if( hdr.zeropad != 0 ) {
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return 0;
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}
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hdr.seconds = pntohl( &hdr.seconds );
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hdr.caplen = pntohs( &hdr.caplen );
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bytesRead = file_read( &tmp, 1, 2, wth->fh );
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if( bytesRead != 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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} else {
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return 0;
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}
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}
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bytesRead = file_read( &iplen, 1, 2, wth->fh );
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if( bytesRead != 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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} else {
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return 0;
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}
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}
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iplen = pntohs(&iplen);
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/* if iplen and hdr.caplen are equal, default to no byteswap. */
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if( iplen > hdr.caplen ) {
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/* maybe this is just a byteswapped version. the iplen ipflags */
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/* and ipid are swapped. We cannot use the normal swaps because */
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/* we don't know the host */
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iplen = BSWAP16(iplen);
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if( iplen <= hdr.caplen ) {
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/* we know this format */
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byteswap = TRUE;
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} else {
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/* don't know this one */
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return 0;
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}
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} else {
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byteswap = FALSE;
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}
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wth->data_offset = 0;
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wth->capture.csids = g_malloc(sizeof(csids_t));
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wth->capture.csids->byteswapped = byteswap;
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wth->file_encap = WTAP_ENCAP_RAW_IP;
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wth->file_type = WTAP_FILE_CSIDS;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = csids_read;
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wth->subtype_seek_read = csids_seek_read;
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/* no file header. So reset the fh to 0 so we can read the first packet */
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file_seek(wth->fh, 0, SEEK_SET);
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return 1;
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}
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/* Find the next packet and parse it; called from wtap_loop(). */
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static gboolean csids_read(wtap *wth, int *err, long *data_offset)
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{
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guint8 *buf;
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int bytesRead = 0;
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struct csids_header hdr;
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*data_offset = wth->data_offset;
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bytesRead = file_read( &hdr, 1, sizeof( struct csids_header) , wth->fh );
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if( bytesRead != sizeof( struct csids_header) ) {
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*err = file_error( wth->fh );
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if (*err == 0 && bytesRead != 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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hdr.seconds = pntohl(&hdr.seconds);
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hdr.caplen = pntohs(&hdr.caplen);
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wth->data_offset += sizeof( struct csids_header );
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/* Make sure we have enough room for the packet */
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buffer_assure_space(wth->frame_buffer, hdr.caplen);
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buf = buffer_start_ptr(wth->frame_buffer);
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bytesRead = file_read( buf, 1, hdr.caplen, wth->fh );
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if( bytesRead != hdr.caplen ) {
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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 FALSE;
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}
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wth->data_offset += hdr.caplen;
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wth->phdr.len = hdr.caplen;
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wth->phdr.caplen = hdr.caplen;
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wth->phdr.ts.tv_sec = hdr.seconds;
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wth->phdr.ts.tv_usec = 0;
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wth->phdr.pkt_encap = WTAP_ENCAP_RAW_IP;
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if( wth->capture.csids->byteswapped == TRUE ) {
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guint16* swap = (guint16*)buf;
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swap++;
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*(swap) = BSWAP16(*swap); /* the ip len */
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swap++;
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*(swap) = BSWAP16(*swap); /* ip id */
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swap++;
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*(swap) = BSWAP16(*swap); /* ip flags and fragoff */
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}
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return TRUE;
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}
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/* Used to read packets in random-access fashion */
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static int
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csids_seek_read (wtap *wth,
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long seek_off,
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union wtap_pseudo_header *pseudo_header,
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guint8 *pd,
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int len)
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{
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int err = 0;
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int bytesRead = 0;
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struct csids_header hdr;
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file_seek(wth->random_fh, seek_off , SEEK_SET);
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bytesRead = file_read( &hdr, 1, sizeof( struct csids_header) , wth->random_fh );
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if( bytesRead != sizeof( struct csids_header) ) {
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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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} else {
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return 0;
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}
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}
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hdr.seconds = pntohl(&hdr.seconds);
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hdr.caplen = pntohs(&hdr.caplen);
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if( len != hdr.caplen ) {
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return -1;
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}
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bytesRead = file_read( pd, 1, hdr.caplen, wth->random_fh );
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if( bytesRead != hdr.caplen ) {
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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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}
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}
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if( wth->capture.csids->byteswapped == TRUE ) {
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guint16* swap = (guint16*)pd;
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swap++;
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*(swap) = BSWAP16(*swap); /* the ip len */
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swap++;
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*(swap) = BSWAP16(*swap); /* ip id */
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swap++;
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*(swap) = BSWAP16(*swap); /* ip flags and fragoff */
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}
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return 0;
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}
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