test: add more inactive filter tests to p2p_filter.py

check the following expected behaviors if no filter is set:
-> filtered block requests are ignored by the node
-> sending a 'filteradd' message is treated as misbehavior
   (i.e. the peer's banscore increases by 100)

also fixes a bug in the on_inv() callback method, which
directly modified the type from BLOCK to FILTERED_BLOCK
in the received 'inv' message rather than just for the reply

Co-authored-by: MarcoFalke <falke.marco@gmail.com>

test/functional/p2p_filter.py

@@ -7,18 +7,20 @@ Test BIP 37
 """
 
 from test_framework.messages import (
+    CInv,
     MSG_BLOCK,
     MSG_FILTERED_BLOCK,
-    msg_getdata,
-    msg_filterload,
     msg_filteradd,
     msg_filterclear,
+    msg_filterload,
+    msg_getdata,
 )
 from test_framework.mininode import (
     P2PInterface,
     mininode_lock,
 )
 from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
 
 
 class FilterNode(P2PInterface):
@@ -38,7 +40,8 @@ class FilterNode(P2PInterface):
         for i in message.inv:
             # inv messages can only contain TX or BLOCK, so translate BLOCK to FILTERED_BLOCK
             if i.type == MSG_BLOCK:
-                i.type = MSG_FILTERED_BLOCK
+                want.inv.append(CInv(MSG_FILTERED_BLOCK, i.hash))
+            else:
                 want.inv.append(i)
         if len(want.inv):
             self.send_message(want)
@@ -104,6 +107,21 @@ class FilterTest(BitcoinTestFramework):
             txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 7)
             filter_node.wait_for_tx(txid)
 
+        self.log.info('Check that request for filtered blocks is ignored if no filter is set')
+        filter_node.merkleblock_received = False
+        filter_node.tx_received = False
+        with self.nodes[0].assert_debug_log(expected_msgs=['received getdata']):
+            block_hash = self.nodes[0].generatetoaddress(1, self.nodes[0].getnewaddress())[0]
+            filter_node.wait_for_inv([CInv(MSG_BLOCK, int(block_hash, 16))])
+            filter_node.sync_with_ping()
+            assert not filter_node.merkleblock_received
+            assert not filter_node.tx_received
+
+        self.log.info('Check that sending "filteradd" if no filter is set is treated as misbehavior (+100)')
+        assert_equal(self.nodes[0].getpeerinfo()[0]['banscore'], 0)
+        filter_node.send_and_ping(msg_filteradd(data=b'letsmisbehave'))
+        assert_equal(self.nodes[0].getpeerinfo()[0]['banscore'], 100)
+
         self.log.info("Check that division-by-zero remote crash bug [CVE-2013-5700] is fixed")
         filter_node.send_and_ping(msg_filterload(data=b'', nHashFuncs=1))
         filter_node.send_and_ping(msg_filteradd(data=b'letstrytocrashthisnode'))