test(integration): add deterministic NAT topology harness (#14)

2026-07-16 11:50:53 +02:00
parent 7e3be2cad1
commit 2ff7cd6d9d
6 changed files with 1308 additions and 95 deletions
@@ -35,3 +35,56 @@ jobs:

      - name: Test
        run: dotnet test Rendezvous.slnx --configuration Release --no-build
+
+      - name: Test privileged Linux namespace topology when available
+        shell: bash
+        run: |
+          set -euo pipefail
+          probe="rendezvous-probe-$$"
+          suffix="$(( $$ % 100000 ))"
+          bridge="rvb${suffix}"
+          veth_root="rvr${suffix}"
+          veth_peer="rvp${suffix}"
+          cleanup_probe() {
+            if [[ -n "$veth_root" ]]; then
+              ip link delete "$veth_root" >/dev/null 2>&1 || true
+            fi
+            if [[ -n "$bridge" ]]; then
+              ip link delete "$bridge" >/dev/null 2>&1 || true
+            fi
+            if [[ -n "$probe" ]]; then
+              ip netns delete "$probe" >/dev/null 2>&1 || true
+            fi
+          }
+          trap cleanup_probe EXIT
+          if command -v ip >/dev/null 2>&1 \
+            && command -v iptables >/dev/null 2>&1 \
+            && command -v sysctl >/dev/null 2>&1 \
+            && ip netns add "$probe" 2>/dev/null \
+            && ip link add "$bridge" type bridge \
+            && ip link add "$veth_root" type veth peer name "$veth_peer" \
+            && ip link set "$veth_root" master "$bridge" \
+            && ip link set "$veth_peer" netns "$probe" \
+            && ip netns exec "$probe" sysctl -q -w net.ipv4.ip_forward=1 \
+            && ip netns exec "$probe" iptables -t nat -A POSTROUTING -o "$veth_peer" -j MASQUERADE \
+            && ip netns exec "$probe" iptables -A FORWARD -i "$veth_peer" -o lo \
+              -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT; then
+            ip link delete "$veth_root"
+            veth_root=""
+            ip link delete "$bridge"
+            bridge=""
+            ip netns delete "$probe"
+            probe=""
+            results="${RUNNER_TEMP:-/tmp}/rendezvous-netns-results"
+            mkdir -p "$results"
+            RENDEZVOUS_RUN_NETNS_TESTS=1 dotnet test Rendezvous.slnx \
+              --configuration Release \
+              --no-build \
+              --filter FullyQualifiedName~PrivilegedLinuxNatNamespacesCompleteDirectTrafficAcrossSeparateObservedEndpoints \
+              --logger "trx;LogFileName=netns.trx" \
+              --results-directory "$results"
+            grep -q 'testName="[^"]*\.PrivilegedLinuxNatNamespacesCompleteDirectTrafficAcrossSeparateObservedEndpoints"' \
+              "$results/netns.trx"
+          else
+            echo "Network namespaces/NAT tooling unavailable; deterministic loopback topology remains the required gate."
+          fi