/** \brief SMTP Filedata Mpm prefilter callback
*
* \param det_ctx detection engine thread ctx
* \param p packet to inspect
* \param f flow to inspect
* \param txv tx to inspect
* \param pectx inspection context
*
* \todo check files against actual tx
*/
static void PrefilterTxSmtpFiledata(DetectEngineThreadCtx *det_ctx,
const void *pectx,
Packet *p, Flow *f, void *txv,
const uint64_t idx, const uint8_t flags)
{
SCEnter();
const MpmCtx *mpm_ctx = (MpmCtx *)pectx;
SMTPState *smtp_state = f->alstate;
FileContainer *ffc = smtp_state->files_ts;
if (ffc != NULL) {
File *file = ffc->head;
for (; file != NULL; file = file->next) {
uint32_t buffer_len = 0;
uint32_t stream_start_offset = 0;
const uint8_t *buffer = DetectEngineSMTPGetBufferForTX(idx,
NULL, det_ctx,
f, file,
flags,
&buffer_len,
&stream_start_offset);
if (buffer != NULL && buffer_len >= mpm_ctx->minlen) {
(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
&det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
}
}
}
}
int DetectEngineRunSMTPMpm(DetectEngineCtx *de_ctx,
DetectEngineThreadCtx *det_ctx, Flow *f,
SMTPState *smtp_state, uint8_t flags,
void *tx, uint64_t idx)
{
FileContainer *ffc = smtp_state->files_ts;
uint32_t cnt = 0;
uint32_t buffer_len = 0;
uint32_t stream_start_offset = 0;
uint8_t *buffer = NULL;
if (ffc != NULL) {
File *file = ffc->head;
for (; file != NULL; file = file->next) {
buffer = DetectEngineSMTPGetBufferForTX(idx,
de_ctx, det_ctx,
f, file,
flags,
&buffer_len,
&stream_start_offset);
if (buffer_len == 0)
goto end;
cnt += SMTPFiledataPatternSearch(det_ctx, buffer, buffer_len, flags);
}
}
end:
return cnt;
}
int DetectEngineInspectSMTPFiledata(ThreadVars *tv,
DetectEngineCtx *de_ctx,
DetectEngineThreadCtx *det_ctx,
Signature *s, Flow *f, uint8_t flags,
void *alstate,
void *tx, uint64_t tx_id)
{
SMTPState *smtp_state = (SMTPState *)alstate;
FileContainer *ffc = smtp_state->files_ts;
int r = 0;
int match = 0;
uint32_t buffer_len = 0;
uint32_t stream_start_offset = 0;
const uint8_t *buffer = 0;
if (ffc != NULL) {
File *file = ffc->head;
for (; file != NULL; file = file->next) {
buffer = DetectEngineSMTPGetBufferForTX(tx_id,
de_ctx, det_ctx,
f, file,
flags,
&buffer_len,
&stream_start_offset);
if (buffer_len == 0)
goto end;
det_ctx->buffer_offset = 0;
det_ctx->discontinue_matching = 0;
det_ctx->inspection_recursion_counter = 0;
match = DetectEngineContentInspection(de_ctx, det_ctx, s, s->sm_lists[DETECT_SM_LIST_FILEDATA],
f,
(uint8_t *)buffer,
buffer_len,
stream_start_offset,
DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
if (match == 1)
r = 1;
}
}
end:
if (r == 1)
return DETECT_ENGINE_INSPECT_SIG_MATCH;
else
return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
}
