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4fec726c4d
This aligns it more with SanityCheckAsmap and reduces variable scope. Also unify asmap casing in SanityCheckAsmap function name. Co-authored-by: Hodlinator <172445034+hodlinator@users.noreply.github.com>
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
// Copyright (c) 2020-present The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <netaddress.h>
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#include <util/asmap.h>
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#include <test/fuzz/fuzz.h>
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#include <cstdint>
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#include <optional>
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#include <vector>
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#include <cassert>
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std::vector<std::byte> BitsToBytes(std::span<const uint8_t> bits) noexcept
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{
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std::vector<std::byte> ret;
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uint8_t next_byte{0};
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int next_byte_bits{0};
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for (uint8_t val : bits) {
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next_byte |= (val & 1) << (next_byte_bits++);
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if (next_byte_bits == 8) {
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ret.push_back(std::byte(next_byte));
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next_byte = 0;
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next_byte_bits = 0;
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}
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}
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if (next_byte_bits) ret.push_back(std::byte(next_byte));
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return ret;
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}
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FUZZ_TARGET(asmap_direct)
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{
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// Encoding: [asmap using 1 bit / byte] 0xFF [addr using 1 bit / byte]
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std::optional<size_t> sep_pos_opt;
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for (size_t pos = 0; pos < buffer.size(); ++pos) {
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uint8_t x = buffer[pos];
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if ((x & 0xFE) == 0) continue;
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if (x == 0xFF) {
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if (sep_pos_opt) return;
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sep_pos_opt = pos;
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} else {
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return;
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}
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}
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if (!sep_pos_opt) return; // Needs exactly 1 separator
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const size_t sep_pos{sep_pos_opt.value()};
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const size_t ip_len{buffer.size() - sep_pos - 1};
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if (ip_len > 128) return; // At most 128 bits in IP address
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// Checks on asmap
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auto asmap = BitsToBytes(buffer.first(sep_pos));
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if (SanityCheckAsmap(asmap, ip_len)) {
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// Verify that for valid asmaps, no prefix (except up to 7 zero padding bits) is valid.
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for (size_t prefix_len = sep_pos - 1; prefix_len > 0; --prefix_len) {
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auto prefix = BitsToBytes(buffer.first(prefix_len));
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// We have to skip the prefixes of the same length as the original
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// asmap, since they will contain some zero padding bits in the last
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// byte.
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if (prefix.size() == asmap.size()) continue;
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assert(!SanityCheckAsmap(prefix, ip_len));
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}
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// No address input should trigger assertions in interpreter
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auto addr = BitsToBytes(buffer.subspan(sep_pos + 1));
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(void)Interpret(asmap, addr);
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}
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}
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