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Differential D9055 Diff 27309 src/test/fuzz/asmap.cpp

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src/test/fuzz/asmap.cpp

// Copyright (c) 2020 The Bitcoin Core developers // Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying // Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php. // file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <netaddress.h> #include <netaddress.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h> #include <test/fuzz/fuzz.h>
#include <cstdint> #include <cstdint>
#include <vector> #include <vector>
//! asmap code that consumes nothing
static const std::vector<bool> IPV6_PREFIX_ASMAP = {};
//! asmap code that consumes the 96 prefix bits of ::ffff:0/96 (IPv4-in-IPv6
//! map)
static const std::vector<bool> IPV4_PREFIX_ASMAP = {
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, false, false, false, false, false, false, false, false, // Match 0x00
true, true, false, true, true, true, true, true, true,
true, true, true, true, true, true, true, true, true, // Match 0xFF
true, true, false, true, true, true, true, true, true,
true, true, true, true, true, true, true, true, true // Match 0xFF
};
void test_one_input(const std::vector<uint8_t> &buffer) { void test_one_input(const std::vector<uint8_t> &buffer) {
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size()); // Encoding: [7 bits: asmap size] [1 bit: ipv6?] [3-130 bytes: asmap] [4 or
const Network network = // 16 bytes: addr]
fuzzed_data_provider.PickValueInArray({NET_IPV4, NET_IPV6}); if (buffer.size() < 1 + 3 + 4) {
if (fuzzed_data_provider.remaining_bytes() < 16) {
return; return;
} }
CNetAddr net_addr; int asmap_size = 3 + (buffer[0] & 127);
net_addr.SetRaw(network, bool ipv6 = buffer[0] & 128;
fuzzed_data_provider.ConsumeBytes<uint8_t>(16).data()); int addr_size = ipv6 ? 16 : 4;
std::vector<bool> asmap; if (buffer.size() < size_t(1 + asmap_size + addr_size)) {
for (const char cur_byte : return;
fuzzed_data_provider.ConsumeRemainingBytes<char>()) {
for (int bit = 0; bit < 8; ++bit) {
asmap.push_back((cur_byte >> bit) & 1);
} }
std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP;
asmap.reserve(asmap.size() + 8 * asmap_size);
for (int i = 0; i < asmap_size; ++i) {
for (int j = 0; j < 8; ++j) {
asmap.push_back((buffer[1 + i] >> j) & 1);
} }
}
if (!SanityCheckASMap(asmap)) {
return;
}
CNetAddr net_addr;
net_addr.SetRaw(ipv6 ? NET_IPV6 : NET_IPV4, buffer.data() + 1 + asmap_size);
(void)net_addr.GetMappedAS(asmap); (void)net_addr.GetMappedAS(asmap);
} }