Merge #13915: [qa] Add test for max number of entries in locator

fa85c985ed qa: Add p2p_invalid_locator test (MarcoFalke)

Pull request description:

  Should not be merged *before* #13907

Tree-SHA512: a67ca407854c421ed20a184d0b0dc90085aed3e3431d9652a107fa3022244767e67f67e50449b7e95721f56906836b134615875f28a21e8a012eb22cfe6a66a5

test/functional/p2p_invalid_locator.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# Copyright (c) 2015-2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test node responses to invalid locators.
+"""
+
+from test_framework.messages import msg_getheaders, msg_getblocks, MAX_LOCATOR_SZ
+from test_framework.mininode import P2PInterface
+from test_framework.test_framework import BitcoinTestFramework
+
+
+class InvalidLocatorTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.setup_clean_chain = False
+
+    def run_test(self):
+        node = self.nodes[0]  # convenience reference to the node
+        node.generate(1)  # Get node out of IBD
+
+        self.log.info('Test max locator size')
+        block_count = node.getblockcount()
+        for msg in [msg_getheaders(), msg_getblocks()]:
+            self.log.info('Wait for disconnect when sending {} hashes in locator'.format(MAX_LOCATOR_SZ + 1))
+            node.add_p2p_connection(P2PInterface())
+            msg.locator.vHave = [int(node.getblockhash(i - 1), 16) for i in range(block_count, block_count - (MAX_LOCATOR_SZ + 1), -1)]
+            node.p2p.send_message(msg)
+            node.p2p.wait_for_disconnect()
+            node.disconnect_p2ps()
+
+            self.log.info('Wait for response when sending {} hashes in locator'.format(MAX_LOCATOR_SZ))
+            node.add_p2p_connection(P2PInterface())
+            msg.locator.vHave = [int(node.getblockhash(i - 1), 16) for i in range(block_count, block_count - (MAX_LOCATOR_SZ), -1)]
+            node.p2p.send_message(msg)
+            if type(msg) == msg_getheaders:
+                node.p2p.wait_for_header(int(node.getbestblockhash(), 16))
+            else:
+                node.p2p.wait_for_block(int(node.getbestblockhash(), 16))
+
+
+if __name__ == '__main__':
+    InvalidLocatorTest().main()

test/functional/test_framework/messages.py

@@ -32,6 +32,7 @@ MY_SUBVERSION = b"/python-mininode-tester:0.0.3/"
 MY_RELAY = 1 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)
 
 MAX_INV_SZ = 50000
+MAX_LOCATOR_SZ = 101
 MAX_BLOCK_BASE_SIZE = 1000000
 
 COIN = 100000000  # 1 btc in satoshis

test/functional/test_framework/mininode.py

@@ -332,6 +332,15 @@ class P2PInterface(P2PConnection):
         test_function = lambda: self.last_message.get("block") and self.last_message["block"].block.rehash() == blockhash
         wait_until(test_function, timeout=timeout, lock=mininode_lock)
 
+    def wait_for_header(self, blockhash, timeout=60):
+        def test_function():
+            last_headers = self.last_message.get('headers')
+            if not last_headers:
+                return False
+            return last_headers.headers[0].rehash() == blockhash
+
+        wait_until(test_function, timeout=timeout, lock=mininode_lock)
+
     def wait_for_getdata(self, timeout=60):
         """Waits for a getdata message.
 

test/functional/test_runner.py

@@ -115,6 +115,7 @@ BASE_SCRIPTS = [
     'wallet_keypool.py',
     'p2p_mempool.py',
     'mining_prioritisetransaction.py',
+    'p2p_invalid_locator.py',
     'p2p_invalid_block.py',
     'p2p_invalid_tx.py',
     'rpc_createmultisig.py',