forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Add a "record type" field to "struct wtap_pkthdr"; currently, it can be REC_TYPE_PACKET, for a record containing a packet, or REC_TYPE_FILE_TYPE_SPECIFIC, for records containing file-type-specific data. Modify code that reads packets to be able to handle non-packet records, even if that just means ignoring them. Rename some routines to indicate that they handle more than just packets. We don't yet have any libwiretap code that supplies records other than REC_TYPE_PACKET or that supporting writing records other than REC_TYPE_PACKET, or any code to support plugins for handling REC_TYPE_FILE_TYPE_SPECIFIC records; this is just the first step for bug 8590. Change-Id: Idb40b78f17c2c3aea72031bcd252abf9bc11c813 Reviewed-on: https://code.wireshark.org/review/1773 Reviewed-by: Guy Harris <guy@alum.mit.edu>
222 lines
6.5 KiB
C
222 lines
6.5 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 "buffer.h"
|
|
#include "csids.h"
|
|
#include "file_wrappers.h"
|
|
|
|
#include <stdio.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 */
|
|
};
|
|
|
|
/* XXX - return -1 on I/O error and actually do something with 'err'. */
|
|
int 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,bytesRead;
|
|
|
|
gboolean byteswap = FALSE;
|
|
struct csids_header hdr;
|
|
csids_t *csids;
|
|
|
|
/* check the file to make sure it is a csids file. */
|
|
bytesRead = file_read( &hdr, sizeof( struct csids_header), wth->fh );
|
|
if( bytesRead != sizeof( struct csids_header) ) {
|
|
*err = file_error( wth->fh, err_info );
|
|
if( *err != 0 && *err != WTAP_ERR_SHORT_READ ) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
if( hdr.zeropad != 0 || hdr.caplen == 0 ) {
|
|
return 0;
|
|
}
|
|
hdr.seconds = pntoh32( &hdr.seconds );
|
|
hdr.caplen = pntoh16( &hdr.caplen );
|
|
bytesRead = file_read( &tmp, 2, wth->fh );
|
|
if( bytesRead != 2 ) {
|
|
*err = file_error( wth->fh, err_info );
|
|
if( *err != 0 && *err != WTAP_ERR_SHORT_READ ) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
bytesRead = file_read( &iplen, 2, wth->fh );
|
|
if( bytesRead != 2 ) {
|
|
*err = file_error( wth->fh, err_info );
|
|
if( *err != 0 && *err != WTAP_ERR_SHORT_READ ) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
iplen = pntoh16(&iplen);
|
|
|
|
if ( iplen == 0 )
|
|
return 0;
|
|
|
|
/* 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 0;
|
|
}
|
|
} 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 -1;
|
|
|
|
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->tsprecision = WTAP_FILE_TSPREC_SEC;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* 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;
|
|
int bytesRead = 0;
|
|
guint8 *pd;
|
|
|
|
bytesRead = file_read( &hdr, sizeof( struct csids_header), fh );
|
|
if( bytesRead != sizeof( struct csids_header) ) {
|
|
*err = file_error( fh, err_info );
|
|
if (*err == 0 && bytesRead != 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return FALSE;
|
|
}
|
|
hdr.seconds = pntoh32(&hdr.seconds);
|
|
hdr.caplen = pntoh16(&hdr.caplen);
|
|
|
|
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 = 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;
|
|
}
|