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1 : : // Copyright (c) 2024-present The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or https://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #include <chain.h>
6 : : #include <chainparams.h>
7 : : #include <consensus/params.h>
8 : : #include <interfaces/mining.h>
9 : : #include <net_processing.h>
10 : : #include <pow.h>
11 : : #include <primitives/block.h>
12 : : #include <protocol.h>
13 : : #include <sync.h>
14 : : #include <test/util/setup_common.h>
15 : : #include <test/util/time.h>
16 : : #include <util/check.h>
17 : : #include <validation.h>
18 : : #include <validationinterface.h>
19 : :
20 : : #include <boost/test/unit_test.hpp>
21 : :
22 : : #include <cstdint>
23 : : #include <memory>
24 : :
25 : : BOOST_FIXTURE_TEST_SUITE(peerman_tests, RegTestingSetup)
26 : :
27 : : /** Window, in blocks, for connecting to NODE_NETWORK_LIMITED peers */
28 : : static constexpr int64_t NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS = 144;
29 : :
30 : 2 : static void mineBlock(node::NodeContext& node, FakeNodeClock& clock, std::chrono::seconds block_time)
31 : : {
32 : 2 : auto curr_time = GetTime<std::chrono::seconds>();
33 : 2 : clock.set(block_time); // update time so the block is created with it
34 : 2 : auto mining{interfaces::MakeMining(node)};
35 [ + - ]: 4 : auto block_template{mining->createNewBlock({}, /*cooldown=*/false)};
36 [ + - + - : 4 : BOOST_REQUIRE(block_template);
+ - ]
37 [ + - ]: 2 : CBlock block{block_template->getBlock()};
38 [ + - + - : 2 : while (!CheckProofOfWork(block.GetHash(), block.nBits, node.chainman->GetConsensus())) ++block.nNonce;
- + ]
39 : 2 : block.fChecked = true; // little speedup
40 [ + - ]: 2 : clock.set(curr_time); // process block at current time
41 [ + - + - : 2 : Assert(node.chainman->ProcessNewBlock(std::make_shared<const CBlock>(block), /*force_processing=*/true, /*min_pow_checked=*/true, nullptr));
- + + - ]
42 [ + - ]: 2 : node.validation_signals->SyncWithValidationInterfaceQueue(); // drain events queue
43 [ + - + - ]: 6 : }
44 : :
45 : : // Verifying when network-limited peer connections are desirable based on the node's proximity to the tip
46 [ + - + - : 7 : BOOST_AUTO_TEST_CASE(connections_desirable_service_flags)
+ - + - -
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+ - + - +
- + - - +
+ - + - +
- + - + -
+ - - + +
- + - + -
+ - + - +
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+ - + - +
- + - + -
+ - - + +
- ]
47 : : {
48 : 1 : FakeNodeClock clock{};
49 [ + - ]: 1 : std::unique_ptr<PeerManager> peerman = PeerManager::make(*m_node.connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, *m_node.warnings, {});
50 [ + - ]: 1 : auto consensus = m_node.chainman->GetParams().GetConsensus();
51 : :
52 : : // Check we start connecting to full nodes
53 : 1 : ServiceFlags peer_flags{NODE_WITNESS | NODE_NETWORK_LIMITED};
54 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
+ - + - ]
55 : :
56 : : // Make peerman aware of the initial best block and verify we accept limited peers when we start close to the tip time.
57 [ + - - + : 4 : auto tip = WITH_LOCK(::cs_main, return m_node.chainman->ActiveChain().Tip());
+ - ]
58 [ + - ]: 1 : uint64_t tip_block_time = tip->GetBlockTime();
59 : 1 : int tip_block_height = tip->nHeight;
60 [ + - ]: 1 : peerman->SetBestBlock(tip_block_height, std::chrono::seconds{tip_block_time});
61 : :
62 [ + - ]: 1 : clock.set(std::chrono::seconds{tip_block_time + 1}); // Set node time to tip time
63 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
+ - + - ]
64 : :
65 : : // Check we don't disallow limited peers connections when we are behind but still recoverable (below the connection safety window)
66 [ + - ]: 1 : clock += std::chrono::seconds{consensus.nPowTargetSpacing * (NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS - 1)};
67 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
+ - + - ]
68 : :
69 : : // Check we disallow limited peers connections when we are further than the limited peers safety window
70 [ + - ]: 1 : clock += std::chrono::seconds{consensus.nPowTargetSpacing * 2};
71 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
+ - + - ]
72 : :
73 : : // By now, we tested that the connections desirable services flags change based on the node's time proximity to the tip.
74 : : // Now, perform the same tests for when the node receives a block.
75 [ + - ]: 1 : m_node.validation_signals->RegisterValidationInterface(peerman.get());
76 : :
77 : : // First, verify a block in the past doesn't enable limited peers connections
78 : : // At this point, our time is (NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS + 1) * 10 minutes ahead the tip's time.
79 [ + - ]: 1 : mineBlock(m_node, clock, /*block_time=*/std::chrono::seconds{tip_block_time + 1});
80 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
+ - ]
81 : :
82 : : // Verify a block close to the tip enables limited peers connections
83 [ + - ]: 1 : mineBlock(m_node, clock, /*block_time=*/GetTime<std::chrono::seconds>());
84 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS));
+ - + - ]
85 : :
86 : : // Lastly, verify the stale tip checks can disallow limited peers connections after not receiving blocks for a prolonged period.
87 [ + - ]: 1 : clock += std::chrono::seconds{consensus.nPowTargetSpacing * NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS + 1};
88 [ + - + - : 2 : BOOST_CHECK(peerman->GetDesirableServiceFlags(peer_flags) == ServiceFlags(NODE_NETWORK | NODE_WITNESS));
+ - ]
89 : 1 : }
90 : :
91 : : BOOST_AUTO_TEST_SUITE_END()
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