Files
forgefirm/forgetest/forgetest
ScottW514 83686fc712 forgectrl.tls-records: a window another client connected in is measured again
The test judges each connection by the kernel's TLS counters and the
crypto engine's interrupt, and both are the machine's, not the
connection's. On image 20260928175056's campaign the test before it
restarted forgectrl, the operator's panel (six HTTPS connections from
the bench PC) reconnected in the same second as aes-1.3#1, and the
kernel counted 7 sessions each way where the test wanted exactly 1; the
connection itself chose AES-128-GCM, carried the page byte for byte, and
counted no decrypt error. _fetch now also reads the machine's accepted
TCP connections (PassiveOpens, shared by both families); a case whose
window saw any connection but its own is measured again, up to 30 times
after a pause drawn from 0.1 to 0.9 s (so no steady poller, such as a
page polling this suite once a second, stays in step with it), and
fails if every window was contested. The judgments are unchanged: exactly one session each way for a cipher the kernel seals,
none for CBC, the engine's interrupt counting the AES records and not
the ChaCha20 ones.

Proof: pyflakes clean. On the bench reference, image 20260928175056,
with an openssl client connecting to :443 every 0.25 s for the first
6 s of the run and the drill polling this suite once a second: the
image's test fails (desktop-1.2 counted 2 sessions each way), the fixed
test passes with contested windows measured again (at most 4 attempts a
case), and passes again without the extra clients (at most 4).

Acceptance: the change is forgectrl.tls-records itself; tlsrec.py holds
no other test, so no other fingerprint moves.
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