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Sniffer: Fix SniffUTP() - #6667
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Fixes XTLS#6664 --------- Co-authored-by: n0ctal <4c866w5fn9@privaterelay.appleid.com>
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Datagrams captured in network namespaces: ST_SYN from libtorrent 2.0.11 and Transmission 4.1 (no extension) and Transmission 2.94 / old libutp (extension 2, the µTorrent shape); non-SYN uTP, curl HTTP/3 QUIC Initial, dig / glibc DNS, Linux kernel WireGuard handshakes, STUN and NTP requests must not match. Plus RTP / RTCP, game queries, 100k random datagrams and the DNS queries closest to the uTP header (transaction id 0x41xx, no EDNS). The previous SniffUTP rejects all nine real SYNs; the XTLS#6667 one accepts them and nothing else. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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#6664 反馈的bug 去除时间检验 改成检查extension结构是否正确