Merge #21345: test: bring p2p_leak.py up to date

a061a29970 test: bring p2p_leak.py up to date. (Martin Zumsande)

Pull request description:

  After the introduction of wtxidrelay and sendaddrv2 messages during version handshake, extend p2p_leak.py test to reflect this.
  Also, some minor fixes and doc improvements.

  I also added a test that peers not completing the version handshake will be disconnected for timeout, as suggested by MarcoFalke in https://github.com/bitcoin/bitcoin/pull/19723#issuecomment-699540294.

ACKs for top commit:
  brunoerg:
    Tested ACK a061a29970
  theStack:
    Tested ACK a061a29970

Tree-SHA512: 26c601491fa8710fc972d1b8f15da6b387a95b42bbfb629ec4c668769ad3824b6dd6a33d97363bca2171e403d8d1ce08abf3e5c9cab34f98d53e0109b1c7a0e5

test/functional/p2p_leak.py

@@ -4,8 +4,8 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test message sending before handshake completion.
 
-A node should never send anything other than VERSION/VERACK until it's
-received a VERACK.
+Before receiving a VERACK, a node should not send anything but VERSION/VERACK
+and feature negotiation messages (WTXIDRELAY, SENDADDRV2).
 
 This test connects to a node and sends it a few messages, trying to entice it
 into sending us something it shouldn't."""
@@ -35,10 +35,12 @@ class LazyPeer(P2PInterface):
         super().__init__()
         self.unexpected_msg = False
         self.ever_connected = False
+        self.got_wtxidrelay = False
+        self.got_sendaddrv2 = False
 
     def bad_message(self, message):
         self.unexpected_msg = True
-        self.log.info("should not have received message: %s" % message.msgtype)
+        print("should not have received message: %s" % message.msgtype)
 
     def on_open(self):
         self.ever_connected = True
@@ -64,6 +66,8 @@ class LazyPeer(P2PInterface):
     def on_cmpctblock(self, message): self.bad_message(message)
     def on_getblocktxn(self, message): self.bad_message(message)
     def on_blocktxn(self, message): self.bad_message(message)
+    def on_wtxidrelay(self, message): self.got_wtxidrelay = True
+    def on_sendaddrv2(self, message): self.got_sendaddrv2 = True
 
 
 # Peer that sends a version but not a verack.
@@ -94,32 +98,61 @@ class P2PVersionStore(P2PInterface):
 class P2PLeakTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
+        self.extra_args = [['-peertimeout=4']]
+
+    def create_old_version(self, nversion):
+        old_version_msg = msg_version()
+        old_version_msg.nVersion = nversion
+        old_version_msg.strSubVer = P2P_SUBVERSION
+        old_version_msg.nServices = P2P_SERVICES
+        old_version_msg.relay = P2P_VERSION_RELAY
+        return old_version_msg
 
     def run_test(self):
-        # Another peer that never sends a version, nor any other messages. It shouldn't receive anything from the node.
+        self.log.info('Check that the node doesn\'t send unexpected messages before handshake completion')
+        # Peer that never sends a version, nor any other messages. It shouldn't receive anything from the node.
         no_version_idle_peer = self.nodes[0].add_p2p_connection(LazyPeer(), send_version=False, wait_for_verack=False)
 
         # Peer that sends a version but not a verack.
         no_verack_idle_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), wait_for_verack=False)
 
-        # Wait until we got the verack in response to the version. Though, don't wait for the node to receive the
-        # verack, since we never sent one
+        # Pre-wtxidRelay peer that sends a version but not a verack and does not support feature negotiation
+        # messages which start at nVersion == 70016
+        pre_wtxidrelay_peer = self.nodes[0].add_p2p_connection(NoVerackIdlePeer(), send_version=False, wait_for_verack=False)
+        pre_wtxidrelay_peer.send_message(self.create_old_version(70015))
+
+        # Wait until the peer gets the verack in response to the version. Though, don't wait for the node to receive the
+        # verack, since the peer never sent one
         no_verack_idle_peer.wait_for_verack()
+        pre_wtxidrelay_peer.wait_for_verack()
 
         no_version_idle_peer.wait_until(lambda: no_version_idle_peer.ever_connected)
         no_verack_idle_peer.wait_until(lambda: no_verack_idle_peer.version_received)
+        pre_wtxidrelay_peer.wait_until(lambda: pre_wtxidrelay_peer.version_received)
 
         # Mine a block and make sure that it's not sent to the connected peers
         self.nodes[0].generate(nblocks=1)
 
-        #Give the node enough time to possibly leak out a message
+        # Give the node enough time to possibly leak out a message
         time.sleep(5)
 
-        self.nodes[0].disconnect_p2ps()
+        # Make sure only expected messages came in
+        assert not no_version_idle_peer.unexpected_msg
+        assert not no_version_idle_peer.got_wtxidrelay
+        assert not no_version_idle_peer.got_sendaddrv2
 
-        # Make sure no unexpected messages came in
-        assert no_version_idle_peer.unexpected_msg == False
-        assert no_verack_idle_peer.unexpected_msg == False
+        assert not no_verack_idle_peer.unexpected_msg
+        assert no_verack_idle_peer.got_wtxidrelay
+        assert no_verack_idle_peer.got_sendaddrv2
+
+        assert not pre_wtxidrelay_peer.unexpected_msg
+        assert not pre_wtxidrelay_peer.got_wtxidrelay
+        assert not pre_wtxidrelay_peer.got_sendaddrv2
+
+        # Expect peers to be disconnected due to timeout
+        assert not no_version_idle_peer.is_connected
+        assert not no_verack_idle_peer.is_connected
+        assert not pre_wtxidrelay_peer.is_connected
 
         self.log.info('Check that the version message does not leak the local address of the node')
         p2p_version_store = self.nodes[0].add_p2p_connection(P2PVersionStore())
@@ -134,13 +167,8 @@ class P2PLeakTest(BitcoinTestFramework):
 
         self.log.info('Check that old peers are disconnected')
         p2p_old_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
-        old_version_msg = msg_version()
-        old_version_msg.nVersion = 31799
-        old_version_msg.strSubVer = P2P_SUBVERSION
-        old_version_msg.nServices = P2P_SERVICES
-        old_version_msg.relay = P2P_VERSION_RELAY
-        with self.nodes[0].assert_debug_log(['peer=3 using obsolete version 31799; disconnecting']):
-            p2p_old_peer.send_message(old_version_msg)
+        with self.nodes[0].assert_debug_log(['peer=4 using obsolete version 31799; disconnecting']):
+            p2p_old_peer.send_message(self.create_old_version(31799))
             p2p_old_peer.wait_for_disconnect()