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Add UDP STUN filter

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This commit is contained in:
Vadim Vetrov
2025-08-11 20:59:06 +03:00
parent d85c723bbe
commit 65e3613a65
3 changed files with 45 additions and 0 deletions
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34
src/quic.c
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@@ -426,6 +426,35 @@ out:
return 0;
}
int is_stun_message(const uint8_t *data, size_t dlen) {
size_t left_len = dlen;
const uint8_t *data_ptr = data;
uint16_t message_type;
uint16_t message_length;
if (left_len < 2 + 2 + 4 + 12) {
return 0;
}
message_type = *(uint16_t *)data_ptr;
data_ptr += 2;
left_len -= 2;
message_length = *(uint16_t *)data_ptr;
data_ptr += 2;
left_len -= 2;
data_ptr += 4;
left_len -= 4;
data_ptr += 12;
left_len -= 12;
message_type = ntohs(message_type);
message_length = ntohs(message_length);
return (left_len == message_length);
}
int detect_udp_filtered(const struct section_config_t *section,
const uint8_t *payload, size_t plen) {
const void *iph;
@@ -544,6 +573,11 @@ match_port:
}
}
if (section->udp_stun_filter && is_stun_message(data, dlen)) {
lgtrace_addp("STUN protocol detected");
goto approve;
}
skip:
return 0;
approve: