From eb5fff9e16b2c3e94835cd3a8897318472df2374 Mon Sep 17 00:00:00 2001 From: Gavin Andresen Date: Thu, 8 Sep 2011 16:50:58 -0400 Subject: [PATCH] Moved checkpoints out of main, to prep for using them to help prevent DoS attacks --- bitcoin-qt.pro | 2 ++ src/checkpoints.cpp | 43 ++++++++++++++++++++++++++++++++++ src/checkpoints.h | 22 +++++++++++++++++ src/main.cpp | 32 ++++--------------------- src/main.h | 1 - src/makefile.linux-mingw | 2 ++ src/makefile.mingw | 2 ++ src/makefile.osx | 2 ++ src/makefile.unix | 2 ++ src/makefile.vc | 6 +++++ src/test/Checkpoints_tests.cpp | 34 +++++++++++++++++++++++++++ src/test/DoS_tests.cpp | 1 - src/test/test_bitcoin.cpp | 1 + 13 files changed, 121 insertions(+), 29 deletions(-) create mode 100644 src/checkpoints.cpp create mode 100644 src/checkpoints.h create mode 100644 src/test/Checkpoints_tests.cpp diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro index 7444ff4ac16..8fc177f7f48 100644 --- a/bitcoin-qt.pro +++ b/bitcoin-qt.pro @@ -88,6 +88,7 @@ HEADERS += src/qt/bitcoingui.h \ src/qt/bitcoinaddressvalidator.h \ src/base58.h \ src/bignum.h \ + src/checkpoints.h \ src/util.h \ src/uint256.h \ src/serialize.h \ @@ -152,6 +153,7 @@ SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \ src/init.cpp \ src/net.cpp \ src/irc.cpp \ + src/checkpoints.cpp \ src/db.cpp \ src/json/json_spirit_writer.cpp \ src/json/json_spirit_value.cpp \ diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp new file mode 100644 index 00000000000..4419a06c830 --- /dev/null +++ b/src/checkpoints.cpp @@ -0,0 +1,43 @@ +// Copyright (c) 2011 The Bitcoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file license.txt or http://www.opensource.org/licenses/mit-license.php. + +#include "checkpoints.h" +#include "uint256.h" +#include "util.h" + +#include // for 'map_list_of()' + +namespace Checkpoints +{ + typedef std::map MapCheckpoints; + + static MapCheckpoints mapCheckpoints = + boost::assign::map_list_of + ( 11111, uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")) + ( 33333, uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")) + ( 68555, uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a")) + ( 70567, uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a")) + ( 74000, uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")) + (105000, uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97")) + (118000, uint256("0x000000000000774a7f8a7a12dc906ddb9e17e75d684f15e00f8767f9e8f36553")) + (134444, uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe")) + (140700, uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd")) + ; + + bool CheckBlock(int nHeight, const uint256& hash) + { + if (fTestNet) return true; // Testnet has no checkpoints + + MapCheckpoints::const_iterator i = mapCheckpoints.find(nHeight); + if (i == mapCheckpoints.end()) return true; + return hash == i->second; + } + + int GetTotalBlocksEstimate() + { + if (fTestNet) return 0; // Testnet has no checkpoints + + return mapCheckpoints.rbegin()->first; + } +} diff --git a/src/checkpoints.h b/src/checkpoints.h new file mode 100644 index 00000000000..32094fdde62 --- /dev/null +++ b/src/checkpoints.h @@ -0,0 +1,22 @@ +// Copyright (c) 2011 The Bitcoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file license.txt or http://www.opensource.org/licenses/mit-license.php. +#ifndef BITCOIN_CHECKPOINT_H +#define BITCOIN_CHECKPOINT_H + +class uint256; + +// +// Block-chain checkpoints are compiled-in sanity checks. +// They are updated every release or three. +// +namespace Checkpoints +{ + // Returns true if block passes checkpoint checks + bool CheckBlock(int nHeight, const uint256& hash); + + // Return conservative estimate of total number of blocks, 0 if unknown + int GetTotalBlocksEstimate(); +} + +#endif diff --git a/src/main.cpp b/src/main.cpp index 47f1090727f..832a0f92402 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -3,6 +3,7 @@ // Distributed under the MIT/X11 software license, see the accompanying // file license.txt or http://www.opensource.org/licenses/mit-license.php. #include "headers.h" +#include "checkpoints.h" #include "db.h" #include "net.h" #include "init.h" @@ -29,7 +30,6 @@ map mapNextTx; map mapBlockIndex; uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"); static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32); -const int nTotalBlocksEstimate = 140700; // Conservative estimate of total nr of blocks on main chain const int nInitialBlockThreshold = 120; // Regard blocks up until N-threshold as "initial download" CBlockIndex* pindexGenesisBlock = NULL; int nBestHeight = -1; @@ -721,28 +721,15 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits) return true; } -// Return conservative estimate of total number of blocks, 0 if unknown -int GetTotalBlocksEstimate() -{ - if(fTestNet) - { - return 0; - } - else - { - return nTotalBlocksEstimate; - } -} - // Return maximum amount of blocks that other nodes claim to have int GetNumBlocksOfPeers() { - return std::max(cPeerBlockCounts.median(), GetTotalBlocksEstimate()); + return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate()); } bool IsInitialBlockDownload() { - if (pindexBest == NULL || nBestHeight < (GetTotalBlocksEstimate()-nInitialBlockThreshold)) + if (pindexBest == NULL || nBestHeight < (Checkpoints::GetTotalBlocksEstimate()-nInitialBlockThreshold)) return true; static int64 nLastUpdate; static CBlockIndex* pindexLastBest; @@ -1317,17 +1304,8 @@ bool CBlock::AcceptBlock() return DoS(10, error("AcceptBlock() : contains a non-final transaction")); // Check that the block chain matches the known block chain up to a checkpoint - if (!fTestNet) - if ((nHeight == 11111 && hash != uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")) || - (nHeight == 33333 && hash != uint256("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")) || - (nHeight == 68555 && hash != uint256("0x00000000001e1b4903550a0b96e9a9405c8a95f387162e4944e8d9fbe501cd6a")) || - (nHeight == 70567 && hash != uint256("0x00000000006a49b14bcf27462068f1264c961f11fa2e0eddd2be0791e1d4124a")) || - (nHeight == 74000 && hash != uint256("0x0000000000573993a3c9e41ce34471c079dcf5f52a0e824a81e7f953b8661a20")) || - (nHeight == 105000 && hash != uint256("0x00000000000291ce28027faea320c8d2b054b2e0fe44a773f3eefb151d6bdc97")) || - (nHeight == 118000 && hash != uint256("0x000000000000774a7f8a7a12dc906ddb9e17e75d684f15e00f8767f9e8f36553")) || - (nHeight == 134444 && hash != uint256("0x00000000000005b12ffd4cd315cd34ffd4a594f430ac814c91184a0d42d2b0fe")) || - (nHeight == 140700 && hash != uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd"))) - return DoS(100, error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight)); + if (!Checkpoints::CheckBlock(nHeight, hash)) + return DoS(100, error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight)); // Write block to history file if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK))) diff --git a/src/main.h b/src/main.h index 60ca3183810..f459d050ce9 100644 --- a/src/main.h +++ b/src/main.h @@ -99,7 +99,6 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1); bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey); bool CheckProofOfWork(uint256 hash, unsigned int nBits); -int GetTotalBlocksEstimate(); int GetNumBlocksOfPeers(); bool IsInitialBlockDownload(); std::string GetWarnings(std::string strFor); diff --git a/src/makefile.linux-mingw b/src/makefile.linux-mingw index 29b433f851a..61f8d4881f0 100644 --- a/src/makefile.linux-mingw +++ b/src/makefile.linux-mingw @@ -32,6 +32,7 @@ CFLAGS=-O2 -w -Wno-invalid-offsetof -Wformat $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATH HEADERS = \ base58.h \ bignum.h \ + checkpoints.h \ crypter.h \ db.h \ headers.h \ @@ -61,6 +62,7 @@ endif LIBS += -l mingwthrd -l kernel32 -l user32 -l gdi32 -l comdlg32 -l winspool -l winmm -l shell32 -l comctl32 -l ole32 -l oleaut32 -l uuid -l rpcrt4 -l advapi32 -l ws2_32 -l shlwapi OBJS= \ + obj/checkpoints.o \ obj/crypter.o \ obj/db.o \ obj/init.o \ diff --git a/src/makefile.mingw b/src/makefile.mingw index 95d09f8770d..2cb78d97e6a 100644 --- a/src/makefile.mingw +++ b/src/makefile.mingw @@ -29,6 +29,7 @@ CFLAGS=-mthreads -O2 -w -Wno-invalid-offsetof -Wformat $(DEBUGFLAGS) $(DEFS) $(I HEADERS = \ base58.h \ bignum.h \ + checkpoints.h \ crypter.h \ db.h \ headers.h \ @@ -58,6 +59,7 @@ endif LIBS += -l kernel32 -l user32 -l gdi32 -l comdlg32 -l winspool -l winmm -l shell32 -l comctl32 -l ole32 -l oleaut32 -l uuid -l rpcrt4 -l advapi32 -l ws2_32 -l shlwapi OBJS= \ + obj/checkpoints.o \ obj/crypter.o \ obj/db.o \ obj/init.o \ diff --git a/src/makefile.osx b/src/makefile.osx index 7830f3bad5f..de718879356 100644 --- a/src/makefile.osx +++ b/src/makefile.osx @@ -49,6 +49,7 @@ CFLAGS=-mmacosx-version-min=10.5 -arch i386 -O3 -Wno-invalid-offsetof -Wformat $ HEADERS = \ base58.h \ bignum.h \ + checkpoints.h \ crypter.h \ db.h \ headers.h \ @@ -69,6 +70,7 @@ HEADERS = \ wallet.h OBJS= \ + obj/checkpoints.o \ obj/crypter.o \ obj/db.o \ obj/init.o \ diff --git a/src/makefile.unix b/src/makefile.unix index 5f841ea0fea..6c48199546d 100644 --- a/src/makefile.unix +++ b/src/makefile.unix @@ -87,6 +87,7 @@ xCXXFLAGS=-pthread -Wno-invalid-offsetof -Wformat $(DEBUGFLAGS) $(DEFS) $(HARDEN HEADERS = \ base58.h \ bignum.h \ + checkpoints.h \ crypter.h \ db.h \ headers.h \ @@ -107,6 +108,7 @@ HEADERS = \ wallet.h OBJS= \ + obj/checkpoints.o \ obj/crypter.o \ obj/db.o \ obj/init.o \ diff --git a/src/makefile.vc b/src/makefile.vc index c7e8578a95e..60f1e096338 100644 --- a/src/makefile.vc +++ b/src/makefile.vc @@ -43,6 +43,7 @@ CFLAGS=/MD /c /nologo /EHsc /GR /Zm300 $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS) HEADERS = \ base58.h \ bignum.h \ + checkpoints.h \ crypter.h \ db.h \ headers.h \ @@ -65,6 +66,7 @@ HEADERS = \ wallet.h OBJS= \ + obj\checkpoints.o \ obj\crypter.o \ obj\db.o \ obj\init.o \ @@ -87,6 +89,8 @@ all: bitcoind.exe .cpp{obj}.obj: cl $(CFLAGS) /DGUI /Fo$@ %s +obj\checkpoints.obj: $(HEADERS) + obj\util.obj: $(HEADERS) obj\script.obj: $(HEADERS) @@ -116,6 +120,8 @@ obj\uibase.obj: $(HEADERS) .cpp{obj\nogui}.obj: cl $(CFLAGS) /Fo$@ %s +obj\nogui\checkpoints.obj: $(HEADERS) + obj\nogui\util.obj: $(HEADERS) obj\nogui\script.obj: $(HEADERS) diff --git a/src/test/Checkpoints_tests.cpp b/src/test/Checkpoints_tests.cpp new file mode 100644 index 00000000000..0d8a366d7ac --- /dev/null +++ b/src/test/Checkpoints_tests.cpp @@ -0,0 +1,34 @@ +// +// Unit tests for block-chain checkpoints +// +#include // for 'map_list_of()' +#include +#include + +#include "../checkpoints.h" +#include "../util.h" + +using namespace std; + +BOOST_AUTO_TEST_SUITE(Checkpoints_tests) + +BOOST_AUTO_TEST_CASE(sanity) +{ + uint256 p11111 = uint256("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"); + uint256 p140700 = uint256("0x000000000000033b512028abb90e1626d8b346fd0ed598ac0a3c371138dce2bd"); + BOOST_CHECK(Checkpoints::CheckBlock(11111, p11111)); + BOOST_CHECK(Checkpoints::CheckBlock(140700, p140700)); + + + // Wrong hashes at checkpoints should fail: + BOOST_CHECK(!Checkpoints::CheckBlock(11111, p140700)); + BOOST_CHECK(!Checkpoints::CheckBlock(140700, p11111)); + + // ... but any hash not at a checkpoint should succeed: + BOOST_CHECK(Checkpoints::CheckBlock(11111+1, p140700)); + BOOST_CHECK(Checkpoints::CheckBlock(140700+1, p11111)); + + BOOST_CHECK(Checkpoints::GetTotalBlocksEstimate() >= 140700); +} + +BOOST_AUTO_TEST_SUITE_END() diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp index e60bb742dd3..1093b73d80e 100644 --- a/src/test/DoS_tests.cpp +++ b/src/test/DoS_tests.cpp @@ -64,5 +64,4 @@ BOOST_AUTO_TEST_CASE(DoS_bantime) BOOST_CHECK(!CNode::IsBanned(addr.ip)); } - BOOST_AUTO_TEST_SUITE_END() diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp index 8863aad4780..39a7c88e135 100644 --- a/src/test/test_bitcoin.cpp +++ b/src/test/test_bitcoin.cpp @@ -13,6 +13,7 @@ #include "util_tests.cpp" #include "base58_tests.cpp" #include "miner_tests.cpp" +#include "Checkpoints_tests.cpp" CWallet* pwalletMain;