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STUN: Filter request-only

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On transit machines it was faking the traffic in two directions
This commit is contained in:
Vadim Vetrov
2025-08-11 22:03:35 +03:00
parent 65e3613a65
commit 23380f7b5c
1 changed files with 14 additions and 1 deletions
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15
src/quic.c
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@@ -452,7 +452,20 @@ int is_stun_message(const uint8_t *data, size_t dlen) {
message_type = ntohs(message_type);
message_length = ntohs(message_length);
return (left_len == message_length);
if (left_len != message_length) {
return 0;
}
if ((message_type & (1 << 15)) || (message_type & (1 << 14))) {
return 0;
}
// Filter request only
if ((message_type & (1 << 4)) || (message_type & (1 << 8))) {
return 0;
}
return 1;
}
int detect_udp_filtered(const struct section_config_t *section,