forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Use WTAP_MAX_PACKET_SIZE_STANDARD, set to 256KB, for everything except for D-Bus captures. Use WTAP_MAX_PACKET_SIZE_DBUS, set to 128MB, for them, because that's the largest possible D-Bus message size. See https://bugs.freedesktop.org/show_bug.cgi?id=100220 for an example of the problems caused by limiting the snapshot length to 256KB for D-Bus. Have a snapshot length of 0 in a capture_file structure mean "there is no snapshot length for the file"; we don't need the has_snap field in that case, a value of 0 mean "no, we don't have a snapshot length". In dumpcap, start out with a pipe buffer size of 2KB, and grow it as necessary. When checking for a too-big packet from a pipe, check against the appropriate maximum - 128MB for DLT_DBUS, 256KB for everything else. Change-Id: Ib2ce7a0cf37b971fbc0318024fd011e18add8b20 Reviewed-on: https://code.wireshark.org/review/21952 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Guy Harris <guy@alum.mit.edu>
225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
/* csids.c
|
|
*
|
|
* Copyright (c) 2000 by Mike Hall <mlh@io.com>
|
|
* Copyright (c) 2000 by Cisco Systems
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "wtap-int.h"
|
|
#include "csids.h"
|
|
#include "file_wrappers.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* This module reads the output from the Cisco Secure Intrusion Detection
|
|
* System iplogging facility. The term iplogging is misleading since this
|
|
* logger will only output TCP. There is no link layer information.
|
|
* Packet format is 4 byte timestamp (seconds since epoch), and a 4 byte size
|
|
* of data following for that packet.
|
|
*
|
|
* For a time there was an error in iplogging and the ip length, flags, and id
|
|
* were byteswapped. We will check for this and handle it before handing to
|
|
* wireshark.
|
|
*/
|
|
|
|
typedef struct {
|
|
gboolean byteswapped;
|
|
} csids_t;
|
|
|
|
static gboolean csids_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset);
|
|
static gboolean csids_seek_read(wtap *wth, gint64 seek_off,
|
|
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
|
|
static gboolean csids_read_packet(FILE_T fh, csids_t *csids,
|
|
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
|
|
|
|
struct csids_header {
|
|
guint32 seconds; /* seconds since epoch */
|
|
guint16 zeropad; /* 2 byte zero'ed pads */
|
|
guint16 caplen; /* the capture length */
|
|
};
|
|
|
|
wtap_open_return_val csids_open(wtap *wth, int *err, gchar **err_info)
|
|
{
|
|
/* There is no file header. There is only a header for each packet
|
|
* so we read a packet header and compare the caplen with iplen. They
|
|
* should always be equal except with the weird byteswap version.
|
|
*
|
|
* THIS IS BROKEN-- anytime the caplen is 0x0101 or 0x0202 up to 0x0505
|
|
* this will byteswap it. I need to fix this. XXX --mlh
|
|
*/
|
|
|
|
int tmp,iplen;
|
|
|
|
gboolean byteswap = FALSE;
|
|
struct csids_header hdr;
|
|
csids_t *csids;
|
|
|
|
/* check the file to make sure it is a csids file. */
|
|
if( !wtap_read_bytes( wth->fh, &hdr, sizeof( struct csids_header), err, err_info ) ) {
|
|
if( *err != WTAP_ERR_SHORT_READ ) {
|
|
return WTAP_OPEN_ERROR;
|
|
}
|
|
return WTAP_OPEN_NOT_MINE;
|
|
}
|
|
if( hdr.zeropad != 0 || hdr.caplen == 0 ) {
|
|
return WTAP_OPEN_NOT_MINE;
|
|
}
|
|
hdr.seconds = pntoh32( &hdr.seconds );
|
|
hdr.caplen = pntoh16( &hdr.caplen );
|
|
if( !wtap_read_bytes( wth->fh, &tmp, 2, err, err_info ) ) {
|
|
if( *err != WTAP_ERR_SHORT_READ ) {
|
|
return WTAP_OPEN_ERROR;
|
|
}
|
|
return WTAP_OPEN_NOT_MINE;
|
|
}
|
|
if( !wtap_read_bytes(wth->fh, &iplen, 2, err, err_info ) ) {
|
|
if( *err != WTAP_ERR_SHORT_READ ) {
|
|
return WTAP_OPEN_ERROR;
|
|
}
|
|
return WTAP_OPEN_NOT_MINE;
|
|
}
|
|
iplen = pntoh16(&iplen);
|
|
|
|
if ( iplen == 0 )
|
|
return WTAP_OPEN_NOT_MINE;
|
|
|
|
/* if iplen and hdr.caplen are equal, default to no byteswap. */
|
|
if( iplen > hdr.caplen ) {
|
|
/* maybe this is just a byteswapped version. the iplen ipflags */
|
|
/* and ipid are swapped. We cannot use the normal swaps because */
|
|
/* we don't know the host */
|
|
iplen = GUINT16_SWAP_LE_BE(iplen);
|
|
if( iplen <= hdr.caplen ) {
|
|
/* we know this format */
|
|
byteswap = TRUE;
|
|
} else {
|
|
/* don't know this one */
|
|
return WTAP_OPEN_NOT_MINE;
|
|
}
|
|
} else {
|
|
byteswap = FALSE;
|
|
}
|
|
|
|
/* no file header. So reset the fh to 0 so we can read the first packet */
|
|
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
|
|
return WTAP_OPEN_ERROR;
|
|
|
|
csids = (csids_t *)g_malloc(sizeof(csids_t));
|
|
wth->priv = (void *)csids;
|
|
csids->byteswapped = byteswap;
|
|
wth->file_encap = WTAP_ENCAP_RAW_IP;
|
|
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_CSIDS;
|
|
wth->snapshot_length = 0; /* not known */
|
|
wth->subtype_read = csids_read;
|
|
wth->subtype_seek_read = csids_seek_read;
|
|
wth->file_tsprec = WTAP_TSPREC_SEC;
|
|
|
|
return WTAP_OPEN_MINE;
|
|
}
|
|
|
|
/* Find the next packet and parse it; called from wtap_read(). */
|
|
static gboolean csids_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset)
|
|
{
|
|
csids_t *csids = (csids_t *)wth->priv;
|
|
|
|
*data_offset = file_tell(wth->fh);
|
|
|
|
return csids_read_packet( wth->fh, csids, &wth->phdr, wth->frame_buffer,
|
|
err, err_info );
|
|
}
|
|
|
|
/* Used to read packets in random-access fashion */
|
|
static gboolean
|
|
csids_seek_read(wtap *wth,
|
|
gint64 seek_off,
|
|
struct wtap_pkthdr *phdr,
|
|
Buffer *buf,
|
|
int *err,
|
|
gchar **err_info)
|
|
{
|
|
csids_t *csids = (csids_t *)wth->priv;
|
|
|
|
if( file_seek( wth->random_fh, seek_off, SEEK_SET, err ) == -1 )
|
|
return FALSE;
|
|
|
|
if( !csids_read_packet( wth->random_fh, csids, phdr, buf, err, err_info ) ) {
|
|
if( *err == 0 )
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
csids_read_packet(FILE_T fh, csids_t *csids, struct wtap_pkthdr *phdr,
|
|
Buffer *buf, int *err, gchar **err_info)
|
|
{
|
|
struct csids_header hdr;
|
|
guint8 *pd;
|
|
|
|
if( !wtap_read_bytes_or_eof( fh, &hdr, sizeof( struct csids_header), err, err_info ) )
|
|
return FALSE;
|
|
hdr.seconds = pntoh32(&hdr.seconds);
|
|
hdr.caplen = pntoh16(&hdr.caplen);
|
|
/*
|
|
* The maximum value of hdr.caplen is 65535, which is less than
|
|
* WTAP_MAX_PACKET_SIZE_STANDARD will ever be, so we don't need to check
|
|
* it.
|
|
*/
|
|
|
|
phdr->rec_type = REC_TYPE_PACKET;
|
|
phdr->presence_flags = WTAP_HAS_TS;
|
|
phdr->len = hdr.caplen;
|
|
phdr->caplen = hdr.caplen;
|
|
phdr->ts.secs = hdr.seconds;
|
|
phdr->ts.nsecs = 0;
|
|
|
|
if( !wtap_read_packet_bytes( fh, buf, phdr->caplen, err, err_info ) )
|
|
return FALSE;
|
|
|
|
pd = ws_buffer_start_ptr( buf );
|
|
if( csids->byteswapped ) {
|
|
if( phdr->caplen >= 2 ) {
|
|
PBSWAP16(pd); /* the ip len */
|
|
if( phdr->caplen >= 4 ) {
|
|
PBSWAP16(pd+2); /* ip id */
|
|
if( phdr->caplen >= 6 )
|
|
PBSWAP16(pd+4); /* ip flags and fragoff */
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|