test/case: new regression test for IPv4 autoconf

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/case/infix_interfaces/all.yaml

@@ -3,3 +3,5 @@
 - case: bridge_veth.py
 - case: dual_bridge.py
 - case: bridge_vlan.py
+- case: ipv4_autoconf.py
+

test/case/infix_interfaces/ipv4_autoconf.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+#
+#   PC ---- e0: 10.0.0.2
+#
+
+import infamy
+
+with infamy.Test() as test:
+    with test.step("Initialize"):
+        env = infamy.Env(infamy.std_topology("1x2"))
+        target = env.attach("target", "mgmt")
+
+    with test.step("Configure an interface with IPv4 ZeroConf IP"):
+        _, tport = env.ltop.xlate("target", "data")
+
+        target.put_config_dict("ietf-interfaces", {
+            "interfaces": {
+                "interface": [
+                    {
+                        "name": tport,
+                        "type": "iana-if-type:ethernetCsmacd",
+                        "enabled": True,
+                        "ipv4": {
+                            "autoconf": {
+                                "enabled": True
+                            }
+                        }
+                    }
+                ]
+            }
+        })
+
+    with test.step("Wait for mDNS message from a 169.254 address ..."):
+        _, hport = env.ltop.xlate("host", "data")
+
+        with infamy.IsolatedMacVlan(hport) as ns:
+            vrfy = ns.runsh("""
+            set -ex
+
+            ip link set iface up
+            ip addr add 10.0.0.1/24 dev iface
+
+            fakeroot tcpdump -q -i iface -c 1 -n host 224.0.0.251 and port 5353 --print 2>/dev/null \
+		| awk 'match($0,/169\\.254\\.[0-9]+\\.[0-9]+/) {print substr($0,RSTART,RLENGTH)}'   \
+		| grep . || exit 1
+            """)
+
+        if vrfy.returncode:
+            print(vrfy.stdout)
+            test.fail()
+
+    test.succeed()