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Differential D9176 Diff 27573 src/test/fuzz/asmap.cpp

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src/test/fuzz/asmap.cpp

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void test_one_input(const std::vector<uint8_t> &buffer) { void test_one_input(const std::vector<uint8_t> &buffer) {
// Encoding: [7 bits: asmap size] [1 bit: ipv6?] [3-130 bytes: asmap] [4 or // Encoding: [7 bits: asmap size] [1 bit: ipv6?] [3-130 bytes: asmap] [4 or
// 16 bytes: addr] // 16 bytes: addr]
if (buffer.size() < 1 + 3 + 4) { if (buffer.size() < 1 + 3 + 4) {
return; return;
} }
int asmap_size = 3 + (buffer[0] & 127); int asmap_size = 3 + (buffer[0] & 127);
bool ipv6 = buffer[0] & 128; bool ipv6 = buffer[0] & 128;
int addr_size = ipv6 ? 16 : 4; const size_t addr_size = ipv6 ? ADDR_IPV6_SIZE : ADDR_IPV4_SIZE;
if (buffer.size() < size_t(1 + asmap_size + addr_size)) { if (buffer.size() < size_t(1 + asmap_size + addr_size)) {
return; return;
} }
std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP; std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP;
asmap.reserve(asmap.size() + 8 * asmap_size); asmap.reserve(asmap.size() + 8 * asmap_size);
for (int i = 0; i < asmap_size; ++i) { for (int i = 0; i < asmap_size; ++i) {
for (int j = 0; j < 8; ++j) { for (int j = 0; j < 8; ++j) {
asmap.push_back((buffer[1 + i] >> j) & 1); asmap.push_back((buffer[1 + i] >> j) & 1);
} }
} }
if (!SanityCheckASMap(asmap)) { if (!SanityCheckASMap(asmap)) {
return; return;
} }
const uint8_t *addr_data = buffer.data() + 1 + asmap_size;
CNetAddr net_addr; CNetAddr net_addr;
net_addr.SetRaw(ipv6 ? NET_IPV6 : NET_IPV4, buffer.data() + 1 + asmap_size); if (ipv6) {
assert(addr_size == ADDR_IPV6_SIZE);
net_addr.SetLegacyIPv6(Span<const uint8_t>(addr_data, addr_size));
} else {
assert(addr_size == ADDR_IPV4_SIZE);
in_addr ipv4;
memcpy(&ipv4, addr_data, addr_size);
net_addr.SetIP(CNetAddr{ipv4});
}
(void)net_addr.GetMappedAS(asmap); (void)net_addr.GetMappedAS(asmap);
} }