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author | MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz> | 2023-06-30 12:42:47 +0200 |
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committer | MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz> | 2024-07-26 17:30:53 +0200 |
commit | fa359255fe6b4de5f26784bfc147dbfb58bef116 (patch) | |
tree | 74c593230af3b43fb84cd036a444259f76043bad /src/node/blockstorage.cpp | |
parent | fa7f7ac040a9467c307b20e77dc47c87d7377ded (diff) | |
download | bitcoin-fa359255fe6b4de5f26784bfc147dbfb58bef116.tar.xz |
Add -blocksxor boolean option
Diffstat (limited to 'src/node/blockstorage.cpp')
-rw-r--r-- | src/node/blockstorage.cpp | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp index 338452c23f..8db5cbc9fd 100644 --- a/src/node/blockstorage.cpp +++ b/src/node/blockstorage.cpp @@ -19,6 +19,7 @@ #include <pow.h> #include <primitives/block.h> #include <primitives/transaction.h> +#include <random.h> #include <reverse_iterator.h> #include <serialize.h> #include <signet.h> @@ -1144,9 +1145,43 @@ FlatFilePos BlockManager::SaveBlockToDisk(const CBlock& block, int nHeight) return blockPos; } +static auto InitBlocksdirXorKey(const BlockManager::Options& opts) +{ + // Bytes are serialized without length indicator, so this is also the exact + // size of the XOR-key file. + std::array<std::byte, 8> xor_key{}; + + if (opts.use_xor && fs::is_empty(opts.blocks_dir)) { + // Only use random fresh key when the boolean option is set and on the + // very first start of the program. + FastRandomContext{}.fillrand(xor_key); + } + + const fs::path xor_key_path{opts.blocks_dir / "xor.dat"}; + if (fs::exists(xor_key_path)) { + // A pre-existing xor key file has priority. + AutoFile xor_key_file{fsbridge::fopen(xor_key_path, "rb")}; + xor_key_file >> xor_key; + } else { + // Create initial or missing xor key file + AutoFile xor_key_file{fsbridge::fopen(xor_key_path, "wbx")}; + xor_key_file << xor_key; + } + // If the user disabled the key, it must be zero. + if (!opts.use_xor && xor_key != decltype(xor_key){}) { + throw std::runtime_error{ + strprintf("The blocksdir XOR-key can not be disabled when a random key was already stored! " + "Stored key: '%s', stored path: '%s'.", + HexStr(xor_key), fs::PathToString(xor_key_path)), + }; + } + LogInfo("Using obfuscation key for blocksdir *.dat files (%s): '%s'\n", fs::PathToString(opts.blocks_dir), HexStr(xor_key)); + return std::vector<std::byte>{xor_key.begin(), xor_key.end()}; +} + BlockManager::BlockManager(const util::SignalInterrupt& interrupt, Options opts) : m_prune_mode{opts.prune_target > 0}, - m_xor_key{}, + m_xor_key{InitBlocksdirXorKey(opts)}, m_opts{std::move(opts)}, m_block_file_seq{FlatFileSeq{m_opts.blocks_dir, "blk", m_opts.fast_prune ? 0x4000 /* 16kB */ : BLOCKFILE_CHUNK_SIZE}}, m_undo_file_seq{FlatFileSeq{m_opts.blocks_dir, "rev", UNDOFILE_CHUNK_SIZE}}, |