tests/e2e: concurrent UDP endpoints must share a reverse tunnel intact

Covers gost#911 at the wire level: four UDP source sockets send through one RUDP reverse tunnel bound on a relay server, and every datagram must come back byte-identical to its own endpoint. A frame torn by an interleaved writer shows up twice — as a corrupted payload, and as the torn frame leaving half a header in the stream, which the far end reads as "unexpected EOF" and answers by rebuilding the whole tunnel. So the suite asserts both: no endpoint sees a corrupted datagram, and no endpoint sees a receive gap long enough to be a teardown and rebind. Verified against a binary built before the fix (4 endpoints, 35% loss, 1.4s gaps, suite fails) and after it (0% loss, no corruption, 0.2s gaps, passes).
2026-10-08 20:15:46 +00:00 · 2026-10-03 16:27:05 +08:00
parent e9fab95872
commit d7656ef3de
5 changed files with 346 additions and 0 deletions
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+# Internal host behind NAT for gost#911: binds a reverse UDP tunnel (rudp)
+# through the relay server and forwards it to the local UDP echo server.
+#
+# The rudp listener opens no local port — it binds the UDP port remotely through
+# the chain. service-1 is a dummy TCP listener purely so the e2e harness has a
+# stable port to wait on for container readiness.
+services:
+  - name: service-0
+    addr: "0.0.0.0:8432"
+    handler:
+      type: rudp
+    listener:
+      type: rudp
+      chain: chain-0
+      metadata:
+        ttl: 5m
+    forwarder:
+      nodes:
+        - name: echo
+          addr: udp-echo:5679
+
+  # Dummy TCP service on a fixed port: the rudp reverse-tunnel listener binds
+  # remotely through the chain and opens no local port, so this gives the e2e
+  # harness a stable port to wait on. Nothing ever targets it — the harness
+  # only opens and immediately closes the connection.
+  - name: service-1
+    addr: ":8431"
+    handler:
+      type: tcp
+    listener:
+      type: tcp
+
+chains:
+  - name: chain-0
+    hops:
+      - nodes:
+        - addr: gost-server:8430
+          connector:
+            type: relay
+          dialer:
+            type: tcp
+
+log:
+  level: debug