20800366dd
Change all wireshark.org URLs to use https. Fix some broken links while we're at it. Change-Id: I161bf8eeca43b8027605acea666032da86f5ea1c Reviewed-on: https://code.wireshark.org/review/34089 Reviewed-by: Guy Harris <guy@alum.mit.edu>
212 lines
6.1 KiB
C
212 lines
6.1 KiB
C
/* csids.c
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "wtap-int.h"
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#include "csids.h"
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#include "file_wrappers.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 Intrusion 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
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* wireshark.
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*/
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typedef struct {
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gboolean byteswapped;
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} csids_t;
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static gboolean csids_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset);
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static gboolean csids_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
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static gboolean csids_read_packet(FILE_T fh, csids_t *csids,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
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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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wtap_open_return_val csids_open(wtap *wth, int *err, gchar **err_info)
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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 weird 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;
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gboolean byteswap = FALSE;
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struct csids_header hdr;
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csids_t *csids;
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/* check the file to make sure it is a csids file. */
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if( !wtap_read_bytes( wth->fh, &hdr, sizeof( struct csids_header), err, err_info ) ) {
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if( *err != WTAP_ERR_SHORT_READ ) {
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return WTAP_OPEN_ERROR;
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}
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return WTAP_OPEN_NOT_MINE;
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}
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if( hdr.zeropad != 0 || hdr.caplen == 0 ) {
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return WTAP_OPEN_NOT_MINE;
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}
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hdr.seconds = pntoh32( &hdr.seconds );
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hdr.caplen = pntoh16( &hdr.caplen );
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if( !wtap_read_bytes( wth->fh, &tmp, 2, err, err_info ) ) {
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if( *err != WTAP_ERR_SHORT_READ ) {
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return WTAP_OPEN_ERROR;
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}
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return WTAP_OPEN_NOT_MINE;
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}
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if( !wtap_read_bytes(wth->fh, &iplen, 2, err, err_info ) ) {
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if( *err != WTAP_ERR_SHORT_READ ) {
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return WTAP_OPEN_ERROR;
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}
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return WTAP_OPEN_NOT_MINE;
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}
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iplen = pntoh16(&iplen);
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if ( iplen == 0 )
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return WTAP_OPEN_NOT_MINE;
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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 = GUINT16_SWAP_LE_BE(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 WTAP_OPEN_NOT_MINE;
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}
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} else {
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byteswap = FALSE;
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}
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/* no file header. So reset the fh to 0 so we can read the first packet */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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csids = (csids_t *)g_malloc(sizeof(csids_t));
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wth->priv = (void *)csids;
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csids->byteswapped = byteswap;
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wth->file_encap = WTAP_ENCAP_RAW_IP;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_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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wth->file_tsprec = WTAP_TSPREC_SEC;
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return WTAP_OPEN_MINE;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean csids_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset)
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{
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csids_t *csids = (csids_t *)wth->priv;
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*data_offset = file_tell(wth->fh);
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return csids_read_packet( wth->fh, csids, rec, buf, err, err_info );
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}
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/* Used to read packets in random-access fashion */
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static gboolean
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csids_seek_read(wtap *wth,
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gint64 seek_off,
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wtap_rec *rec,
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Buffer *buf,
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int *err,
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gchar **err_info)
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{
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csids_t *csids = (csids_t *)wth->priv;
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if( file_seek( wth->random_fh, seek_off, SEEK_SET, err ) == -1 )
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return FALSE;
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if( !csids_read_packet( wth->random_fh, csids, rec, buf, err, err_info ) ) {
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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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return TRUE;
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}
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static gboolean
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csids_read_packet(FILE_T fh, csids_t *csids, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info)
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{
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struct csids_header hdr;
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guint8 *pd;
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if( !wtap_read_bytes_or_eof( fh, &hdr, sizeof( struct csids_header), err, err_info ) )
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return FALSE;
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hdr.seconds = pntoh32(&hdr.seconds);
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hdr.caplen = pntoh16(&hdr.caplen);
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/*
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* The maximum value of hdr.caplen is 65535, which is less than
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* WTAP_MAX_PACKET_SIZE_STANDARD will ever be, so we don't need to check
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* it.
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*/
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rec->rec_type = REC_TYPE_PACKET;
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rec->presence_flags = WTAP_HAS_TS;
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rec->rec_header.packet_header.len = hdr.caplen;
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rec->rec_header.packet_header.caplen = hdr.caplen;
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rec->ts.secs = hdr.seconds;
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rec->ts.nsecs = 0;
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if( !wtap_read_packet_bytes( fh, buf, rec->rec_header.packet_header.caplen, err, err_info ) )
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return FALSE;
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pd = ws_buffer_start_ptr( buf );
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if( csids->byteswapped ) {
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if( rec->rec_header.packet_header.caplen >= 2 ) {
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PBSWAP16(pd); /* the ip len */
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if( rec->rec_header.packet_header.caplen >= 4 ) {
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PBSWAP16(pd+2); /* ip id */
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if( rec->rec_header.packet_header.caplen >= 6 )
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PBSWAP16(pd+4); /* ip flags and fragoff */
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}
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}
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}
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return TRUE;
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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