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93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* Copyright (C) 2007-2010 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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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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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Implements rawbytes keyword support
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*
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* \todo Provide un-normalized telnet dce/rpc buffers to match on
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*/
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#include "suricata-common.h"
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#include "decode.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "flow-var.h"
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#include "detect-content.h"
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#include "detect-pcre.h"
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#include "util-debug.h"
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static int DetectRawbytesSetup (DetectEngineCtx *, Signature *, char *);
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void DetectRawbytesRegister (void) {
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sigmatch_table[DETECT_RAWBYTES].name = "rawbytes";
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sigmatch_table[DETECT_RAWBYTES].Match = NULL;
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sigmatch_table[DETECT_RAWBYTES].Setup = DetectRawbytesSetup;
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sigmatch_table[DETECT_RAWBYTES].Free = NULL;
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sigmatch_table[DETECT_RAWBYTES].RegisterTests = NULL;
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sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_PAYLOAD;
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}
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static int DetectRawbytesSetup (DetectEngineCtx *de_ctx, Signature *s, char *nullstr)
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{
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SCEnter();
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if (nullstr != NULL) {
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SCLogError(SC_ERR_INVALID_VALUE, "rawbytes has no value");
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return -1;
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}
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if (s->list != DETECT_SM_LIST_NOTSET) {
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SCLogError(SC_ERR_RAWBYTES_FILE_DATA, "\"rawbytes\" cannot be combined with \"file_data\"");
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SCReturnInt(-1);
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}
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SigMatch *pm = SigMatchGetLastSMFromLists(s, 2,
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DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH]);
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if (pm == NULL) {
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SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"rawbytes\" needs a preceding content option");
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SCReturnInt(-1);
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}
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switch (pm->type) {
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case DETECT_CONTENT:
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{
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DetectContentData *cd = (DetectContentData *)pm->ctx;
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if (cd->flags & DETECT_CONTENT_RAWBYTES) {
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SCLogError(SC_ERR_INVALID_SIGNATURE, "can't use multiple rawbytes modifiers for the same content. ");
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SCReturnInt(-1);
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}
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cd->flags |= DETECT_CONTENT_RAWBYTES;
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break;
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}
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default:
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SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"rawbytes\" needs a preceding content option");
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SCReturnInt(-1);
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}
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SCReturnInt(0);
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}
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