tests: add some integration tests without the local address

Copy a few tunnels common tests and remove the local address to ensure
both backends will work fine.

tests/integration/tunnels.py

@@ -45,6 +45,20 @@ def test_tunnel_sit(self):
         self.generate_and_settle(['sit-tun0'])
         self.assert_iface('sit-tun0', ['sit-tun0@NONE', 'link.* 192.168.5.1 peer 99.99.99.99'])
 
+    def test_tunnel_sit_without_local_address(self):
+        self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'sit-tun0'], stderr=subprocess.DEVNULL)
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  renderer: %(r)s
+  version: 2
+  tunnels:
+    sit-tun0:
+      mode: sit
+      remote: 99.99.99.99
+''' % {'r': self.backend})
+        self.generate_and_settle(['sit-tun0'])
+        self.assert_iface('sit-tun0', ['sit-tun0@NONE', 'link.* 0.0.0.0 peer 99.99.99.99'])
+
     def test_tunnel_ipip(self):
         self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'tun0'], stderr=subprocess.DEVNULL)
         with open(self.config, 'w') as f:
@@ -61,6 +75,21 @@ def test_tunnel_ipip(self):
         self.generate_and_settle(['tun0'])
         self.assert_iface('tun0', ['tun0@NONE', 'link.* 192.168.5.1 peer 99.99.99.99'])
 
+    def test_tunnel_ipip_without_local_address(self):
+        self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'tun0'], stderr=subprocess.DEVNULL)
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  renderer: %(r)s
+  version: 2
+  tunnels:
+    tun0:
+      mode: ipip
+      remote: 99.99.99.99
+      ttl: 64
+''' % {'r': self.backend})
+        self.generate_and_settle(['tun0'])
+        self.assert_iface('tun0', ['tun0@NONE', 'link.* 0.0.0.0 peer 99.99.99.99'])
+
     def test_tunnel_wireguard(self):
         self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'wg0'], stderr=subprocess.DEVNULL)
         self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'wg1'], stderr=subprocess.DEVNULL)
@@ -142,6 +171,20 @@ def test_tunnel_gre(self):
         self.generate_and_settle(['tun0'])
         self.assert_iface('tun0', ['tun0@NONE', 'link.* 192.168.5.1 peer 99.99.99.99'])
 
+    def test_tunnel_gre_without_local_address(self):
+        self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'tun0'], stderr=subprocess.DEVNULL)
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  renderer: %(r)s
+  version: 2
+  tunnels:
+    tun0:
+      mode: gre
+      remote: 99.99.99.99
+''' % {'r': self.backend})
+        self.generate_and_settle(['tun0'])
+        self.assert_iface('tun0', ['tun0@NONE', 'link.* 0.0.0.0 peer 99.99.99.99'])
+
     def test_tunnel_gre6(self):
         self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'tun0'], stderr=subprocess.DEVNULL)
         with open(self.config, 'w') as f: