diff options
Diffstat (limited to 'framework/src/suricata/src/detect-rawbytes.c')
-rw-r--r-- | framework/src/suricata/src/detect-rawbytes.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/framework/src/suricata/src/detect-rawbytes.c b/framework/src/suricata/src/detect-rawbytes.c new file mode 100644 index 00000000..872a71a0 --- /dev/null +++ b/framework/src/suricata/src/detect-rawbytes.c @@ -0,0 +1,93 @@ +/* Copyright (C) 2007-2010 Open Information Security Foundation + * + * You can copy, redistribute or modify this Program under the terms of + * the GNU General Public License version 2 as published by the Free + * Software Foundation. + * + * 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 + * version 2 along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/** + * \file + * + * \author Victor Julien <victor@inliniac.net> + * + * Implements rawbytes keyword support + * + * \todo Provide un-normalized telnet dce/rpc buffers to match on + */ + +#include "suricata-common.h" + +#include "decode.h" +#include "detect.h" +#include "detect-parse.h" +#include "flow-var.h" + +#include "detect-content.h" +#include "detect-pcre.h" + +#include "util-debug.h" + +static int DetectRawbytesSetup (DetectEngineCtx *, Signature *, char *); + +void DetectRawbytesRegister (void) +{ + sigmatch_table[DETECT_RAWBYTES].name = "rawbytes"; + sigmatch_table[DETECT_RAWBYTES].Match = NULL; + sigmatch_table[DETECT_RAWBYTES].Setup = DetectRawbytesSetup; + sigmatch_table[DETECT_RAWBYTES].Free = NULL; + sigmatch_table[DETECT_RAWBYTES].RegisterTests = NULL; + + sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_NOOPT; + sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_PAYLOAD; +} + +static int DetectRawbytesSetup (DetectEngineCtx *de_ctx, Signature *s, char *nullstr) +{ + SCEnter(); + + if (nullstr != NULL) { + SCLogError(SC_ERR_INVALID_VALUE, "rawbytes has no value"); + return -1; + } + + if (s->list != DETECT_SM_LIST_NOTSET) { + SCLogError(SC_ERR_RAWBYTES_FILE_DATA, "\"rawbytes\" cannot be combined with \"file_data\""); + SCReturnInt(-1); + } + + SigMatch *pm = SigMatchGetLastSMFromLists(s, 2, + DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH]); + if (pm == NULL) { + SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"rawbytes\" needs a preceding content option"); + SCReturnInt(-1); + } + + switch (pm->type) { + case DETECT_CONTENT: + { + DetectContentData *cd = (DetectContentData *)pm->ctx; + if (cd->flags & DETECT_CONTENT_RAWBYTES) { + SCLogError(SC_ERR_INVALID_SIGNATURE, "can't use multiple rawbytes modifiers for the same content. "); + SCReturnInt(-1); + } + cd->flags |= DETECT_CONTENT_RAWBYTES; + break; + } + default: + SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"rawbytes\" needs a preceding content option"); + SCReturnInt(-1); + } + + SCReturnInt(0); +} + |