A handshake message may span any number of records, and splitting the
ClientHello into tiny records hides the SNI from analyzers that expect it
in the first one. The tls analyzer read the first record header and then
cut the handshake body straight out of the stream, so fragmented hellos
either stalled until Limit() or failed to parse, and every SNI rule was
bypassed.
The record layer is now peeled off and the hello rebuilt from the record
bodies before parsing, for both ClientHello and ServerHello. The number of
records a hello spanned is exposed as tls.req_records / tls.resp_records,
kept outside req/resp so a non-nil req still means a fully parsed hello.
Fragmentation is published as soon as a second record shows up, since
1-byte records can stretch a hello past Limit() and it never completes.
docs: add TLS record fragmentation doc, correct the claim in the TCP
window evasion doc that tls is unaffected by splitting.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Port of NoBrand-Cloud/OpenGFW-RS commit 1177ff7 to Go.
EasyTier's ciphers cover only the payload: the 16-byte PeerManagerHeader
stays in the clear, so peer ids, packet type and two redundant length
fields are readable even on an encrypted mesh. The plaintext handshake
also carries the network name, which lets a rule block one mesh and
leave the rest alone (easytier.network_name). A Syn answered by a Sack
echoing the same connection id and magic, or a handshake carrying the
0xd1e1a5e1 magic, settles a flow on its own; otherwise two consistent
frames are required. Hole-punch probes are reported but never set yes.
The wg://, quic:// and wss:// transports are left to the wireguard, quic
and tls analyzers. fet does not cover the tcp:// transport because it
classifies the plaintext handshake segment and is then done.
Rules must be written as `easytier != nil && ...`: the rule engine only
exposes analyzers that have published properties.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjQ1CTBn8j65cUZ2JKsY7L
feat(tcp): implement FETAnalyzer with segment buffering
feat(tcp): enhance TCP engine with window scale detection
test(tcp): add tests for Minecraft and FET analyzers
docs: add documentation for Minecraft analyzer and TCP evasion
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