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12849b1535fb520386a6687870cdc44ad2a40a84
mdg-filius/packages/core/test/scenarios/tcp-routed-loss.swift.json
T
julian.kiedaischandClaude Opus 5.5 12849b1535 feat(core): TCP in the simulation core 
engine.ts ports Swift's "Java-compatible TCP sockets" in one piece, since
half a state machine could not be checked: server and client sockets (a
free port from Java's random numbers on their own seed), the three-way
handshake with its result (connected, invalid socket, unreachable, timed
out), segments of 1460 bytes, messages up to the push, a timeout of
3 × 2.5 s with at most three attempts, closing through every Java state
including TIME_WAIT (2.5 s), sequence numbers modulo 2^32.

Three scenarios match the Swift engine trace for trace: a LAN with data
over three segments, closing from both ends, a closed port and an
unreachable host; two networks through a router with a firewall rule,
data lost until the connection closes, and an accepted socket that does
not hold the port of its closed listener; CLOSING, reached by a lost FIN.
The engine delivers a FIN within the same close, so both ends close at
once only with packet loss; an empty message does not arrive in Swift (it
does not advance the sequence number), nor here.

Swift's four TCP engine tests are ported, with tests for stopping, a
foreign SYN+ACK at a listener and the flag names. 17 mutation probes, 16
caught; the other (delivered, not waited, not connected gives unreachable)
cannot be reached through Swift's engine, which never sends a reset and
always acknowledges correctly.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-30 10:03:16 +00:00

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"layer" : "dataLink",
"node" : "00000000-0000-0000-0000-000000000201",
"operation" : "created",
"packet" : 11,
"time" : 38380
},
{
"after" : [
[
"sourceMAC",
"02:00:00:00:02:11"
],
[
"destinationMAC",
"02:00:00:00:02:21"
]
],
"before" : [
],
"direction" : "outbound",
"frame" : 22,
"id" : 157,
"interface" : "00000000-0000-0000-0000-000000000211",
"layer" : "physical",
"node" : "00000000-0000-0000-0000-000000000201",
"operation" : "sent",
"packet" : 11,
"time" : 38380
},
{
"after" : [
[
"sourceMAC",
"02:00:00:00:02:11"
],
[
"destinationMAC",
"02:00:00:00:02:21"
]
],
"before" : [
],
"detail" : "global packet-loss simulation",
"direction" : "inbound",
"frame" : 22,
"id" : 158,
"interface" : "00000000-0000-0000-0000-000000000221",
"layer" : "physical",
"node" : "00000000-0000-0000-0000-000000000202",
"operation" : "dropped",
"packet" : 11,
"time" : 38435
},
{
"after" : [
[
"state",
"CLOSED"
]
],
"before" : [
[
"state",
"ESTABLISHED"
]
],
"detail" : "TCP ESTABLISHED -> CLOSED",
"direction" : "local",
"id" : 159,
"layer" : "transport",
"node" : "00000000-0000-0000-0000-000000000201",
"operation" : "accepted",
"time" : 45880
},
{
"after" : [
[
"state",
"CLOSED"
]
],
"before" : [
[
"state",
"LISTEN"
]
],
"detail" : "TCP LISTEN -> CLOSED",
"direction" : "local",
"id" : 160,
"layer" : "transport",
"node" : "00000000-0000-0000-0000-000000000203",
"operation" : "accepted",
"time" : 45880
},
{
"after" : [
[
"state",
"LISTEN"
]
],
"before" : [
[
"state",
"CLOSED"
]
],
"detail" : "TCP CLOSED -> LISTEN",
"direction" : "local",
"id" : 161,
"layer" : "transport",
"node" : "00000000-0000-0000-0000-000000000203",
"operation" : "accepted",
"time" : 45880
}
]
}
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