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detect: log app-layer metadata in alert with single tx #12153

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detect: log app-layer metadata in alert with single tx #12153

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4 changes: 3 additions & 1 deletion src/detect.c
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Original file line number Diff line number Diff line change
Expand Up @@ -814,9 +814,11 @@ static inline void DetectRulePacketRules(

uint64_t txid = PACKET_ALERT_NOTX;
if ((alert_flags & PACKET_ALERT_FLAG_STREAM_MATCH) ||
(s->alproto != ALPROTO_UNKNOWN && pflow->proto == IPPROTO_UDP)) {
(s->alproto != ALPROTO_UNKNOWN && pflow->proto == IPPROTO_UDP) ||
AppLayerParserGetTxCnt(pflow, pflow->alstate) == 1) {
// if there is a stream match (TCP), or
// a UDP specific app-layer signature,
// or only one transaction
// try to use the good tx for the packet direction
if (pflow->alstate) {
uint8_t dir =
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