Merge #16551: test: Test that low difficulty chain fork is rejected

Backport notice:
 - data have real blocks from testnet
 - due to big gap in blocks before checkpoints (half-year) for sack of this test is added one more checkpoint, otherwise blocks are not accepted due to non-mockable time for other chains except regtest
 - data for 2 blocks in split chain are generated locally for testnet
--------------
333317ce6b67aa92f7363d48cd750712190b4b6b test: Test that low difficulty chain fork is rejected (MarcoFalke)
fa31dc1bf4ee471c4641eef8de02702ba0619ae7 test: Pass down correct chain name in tests (MarcoFalke)

Pull request description:

  To prevent OOM, Bitcoin Core will reject chain forks at low difficulty by default. This is the only use-case of checkpoints, so add a test for it to make sure the feature works as expected. If it didn't work, checkpoints would have no use-case and we might as well remove them

ACKs for top commit:
  Sjors:
    Thanks for adding the node 1 example. Code review ACK 333317c

Tree-SHA512: 90dffa540d0904f3cffb61d2382b1a26f84fe9560b7013e4461546383add31a8757b350616a6d43217c59ef7b8b2a1b62bb3bab582c679cbb2c660a782ce7be1

src/chainparams.cpp

@@ -496,6 +496,7 @@ public:
 
         checkpointData = {
             {
+                {255, uint256S("0x0000080b600e06f4c07880673f027210f9314575f5f875fafe51971e268b886a")},
                 {261, uint256S("0x00000c26026d0815a7e2ce4fa270775f61403c040647ff2c3091f99e894a4618")},
                 {1999, uint256S("0x00000052e538d27fa53693efe6fb6892a0c1d26c0235f599171c48a3cce553b1")},
                 {2999, uint256S("0x0000024bc3f4f4cb30d29827c13d921ad77d2c6072e586c7f60d83c2722cdcc5")},

test/functional/data/blockheader_testnet3.hex

@@ -0,0 +1,258 @@
+fork:000000202cbcf83b62913d56f605c0e581a48872839428c92e5eb76cd7ad94bcaf0b0000c41f893a0d296b3b17730b42beb432aedc62473d0e6839910209d7f21af31a9bb9968054ffff0f1efd6b0e00
+fork:000000201ed4bb12db90cfb7c68051d82f922b86b24c6a247de6168678c9a489ef020000e5968c16ea68f5f8d6ce1f1a987a7484986710c7cae2ac81ca1b5552f059aeceba968054f0ff0f1ef38f0c00
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+020000000172588cc0148b9d48e19738a6afd40c830bfc5d3858d98b260124aae90a00006523c9dd6a6afc51ee86951efab764bdb98c43a6102f5714086dda3c1ffb0dc0778eca53f0ff0f1e4e0e0200
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test/functional/mining_basic.py

@@ -13,6 +13,7 @@ from decimal import Decimal
 
 from test_framework.blocktools import (
     create_coinbase,
+    filter_tip_keys,
     NORMAL_GBT_REQUEST_PARAMS,
     TIME_GENESIS_BLOCK,
 )
@@ -196,17 +197,6 @@ class MiningTest(BitcoinTestFramework):
         block.nTime += 1
         block.solve()
 
-        def filter_tip_keys(chaintips):
-            """
-            Dash chaintips rpc returns extra info in each tip (difficulty, chainwork, and
-            forkpoint). Filter down to relevant ones checked in this test.
-            """
-            check_keys = ["hash", "height", "branchlen", "status"]
-            filtered_tips = []
-            for tip in chaintips:
-                filtered_tips.append({k: tip[k] for k in check_keys})
-            return filtered_tips
-
         def chain_tip(b_hash, *, status='headers-only', branchlen=1):
             return {'hash': b_hash, 'height': 202, 'branchlen': branchlen, 'status': status}
         assert chain_tip(block.hash) not in filter_tip_keys(node.getchaintips())

test/functional/p2p_dos_header_tree.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 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 that we reject low difficulty headers to prevent our block tree from filling up with useless bloat"""
+
+from test_framework.blocktools import filter_tip_keys
+
+from test_framework.messages import (
+    CBlockHeader,
+    from_hex,
+)
+from test_framework.p2p import (
+    P2PInterface,
+    msg_headers,
+)
+from test_framework.test_framework import BitcoinTestFramework
+
+import os
+
+class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.chain = 'testnet3'  # Use testnet chain because it has an early checkpoint
+        self.num_nodes = 2
+
+    def add_options(self, parser):
+        parser.add_argument(
+            '--datafile',
+            default='data/blockheader_testnet3.hex',
+            help='Test data file (default: %(default)s)',
+        )
+
+    def run_test(self):
+        self.log.info("Read headers data")
+        self.headers_file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), self.options.datafile)
+        with open(self.headers_file_path, encoding='utf-8') as headers_data:
+            h_lines = [l.strip() for l in headers_data.readlines()]
+
+        # The headers data is taken from testnet3 for early blocks from genesis until the first checkpoint. There are
+        # two headers with valid POW at height 1 and 2, forking off from genesis. They are indicated by the FORK_PREFIX.
+        FORK_PREFIX = 'fork:'
+        self.headers = [l for l in h_lines if not l.startswith(FORK_PREFIX)]
+        self.headers_fork = [l[len(FORK_PREFIX):] for l in h_lines if l.startswith(FORK_PREFIX)]
+
+        self.headers = [from_hex(CBlockHeader(), h) for h in self.headers]
+        self.headers_fork = [from_hex(CBlockHeader(), h) for h in self.headers_fork]
+
+        self.log.info("Feed all non-fork headers, including and up to the first checkpoint")
+        peer_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface())
+        peer_checkpoint.send_and_ping(msg_headers(self.headers))
+
+        assert {
+            'height': 255,
+            'hash': '0000080b600e06f4c07880673f027210f9314575f5f875fafe51971e268b886a',
+            'branchlen': 255,
+            'status': 'headers-only',
+        } in filter_tip_keys(self.nodes[0].getchaintips())
+
+        self.log.info("Feed all fork headers (fails due to checkpoint)")
+        with self.nodes[0].assert_debug_log(['bad-fork-prior-to-checkpoint']):
+            peer_checkpoint.send_message(msg_headers(self.headers_fork))
+            peer_checkpoint.wait_for_disconnect()
+
+        self.log.info("Feed all fork headers (succeeds without checkpoint)")
+        # On node 0 it succeeds because checkpoints are disabled
+        self.restart_node(0, extra_args=['-nocheckpoints'])
+        peer_no_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface())
+        peer_no_checkpoint.send_and_ping(msg_headers(self.headers_fork))
+        assert {
+            "height": 2,
+            "hash": "00000d3aca6b09e1e0a91196f53654e08eb7bfc897ffbf24040c7686584f0209",
+            "branchlen": 2,
+            "status": "headers-only",
+        } in filter_tip_keys(self.nodes[0].getchaintips())
+
+        # On node 1 it succeeds because no checkpoint has been reached yet by a chain tip
+        peer_before_checkpoint = self.nodes[1].add_p2p_connection(P2PInterface())
+        peer_before_checkpoint.send_and_ping(msg_headers(self.headers_fork))
+        assert {
+            "height": 2,
+            "hash": "00000d3aca6b09e1e0a91196f53654e08eb7bfc897ffbf24040c7686584f0209",
+            "branchlen": 2,
+            "status": "headers-only",
+        } in filter_tip_keys(self.nodes[0].getchaintips())
+
+
+if __name__ == '__main__':
+    RejectLowDifficultyHeadersTest().main()

test/functional/test_framework/blocktools.py

@@ -246,6 +246,17 @@ def get_legacy_sigopcount_tx(tx, accurate=True):
         count += CScript(j.scriptSig).GetSigOpCount(accurate)
     return count
 
+"""
+Dash chaintips rpc returns extra info in each tip (difficulty, chainwork, and
+forkpoint). Filter down to relevant ones checked in this test.
+"""
+def filter_tip_keys(chaintips):
+    check_keys = ["hash", "height", "branchlen", "status"]
+    filtered_tips = []
+    for tip in chaintips:
+        filtered_tips.append({k: tip[k] for k in check_keys})
+    return filtered_tips
+
 # Identical to GetMasternodePayment in C++ code
 def get_masternode_payment(nHeight, blockValue, fV20Active):
     ret = int(blockValue / 5)

test/functional/test_runner.py

@@ -305,6 +305,7 @@ BASE_SCRIPTS = [
     'wallet_coinbase_category.py --descriptors',
     'feature_filelock.py',
     'feature_loadblock.py',
+    'p2p_dos_header_tree.py',
     'p2p_blockfilters.py',
     'p2p_message_capture.py',
     'feature_asmap.py',