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// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <netaddress.h>
#include <util/asmap.h>
#include <test/fuzz/fuzz.h>
#include <cstdint>
#include <optional>
#include <vector>
#include <assert.h>
FUZZ_TARGET(asmap_direct)
{
// Encoding: [asmap using 1 bit / byte] 0xFF [addr using 1 bit / byte]
std::optional<size_t> sep_pos_opt;
for (size_t pos = 0; pos < buffer.size(); ++pos) {
uint8_t x = buffer[pos];
if ((x & 0xFE) == 0) continue;
if (x == 0xFF) {
if (sep_pos_opt) return;
sep_pos_opt = pos;
} else {
return;
}
}
if (!sep_pos_opt) return; // Needs exactly 1 separator
const size_t sep_pos{sep_pos_opt.value()};
if (buffer.size() - sep_pos - 1 > 128) return; // At most 128 bits in IP address
// Checks on asmap
std::vector<bool> asmap(buffer.begin(), buffer.begin() + sep_pos);
if (SanityCheckASMap(asmap, buffer.size() - 1 - sep_pos)) {
// Verify that for valid asmaps, no prefix (except up to 7 zero padding bits) is valid.
std::vector<bool> asmap_prefix = asmap;
while (!asmap_prefix.empty() && asmap_prefix.size() + 7 > asmap.size() && asmap_prefix.back() == false) {
asmap_prefix.pop_back();
}
while (!asmap_prefix.empty()) {
asmap_prefix.pop_back();
assert(!SanityCheckASMap(asmap_prefix, buffer.size() - 1 - sep_pos));
}
// No address input should trigger assertions in interpreter
std::vector<bool> addr(buffer.begin() + sep_pos + 1, buffer.end());
(void)Interpret(asmap, addr);
}
}
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