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fuzz: ConsumeNetAddr(): avoid IPv6 addresses that look like CJDNS

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The fuzz testing framework runs as if `-cjdnsreachable` is set and in
this case addresses like `{net=IPv6, addr=fc...}` are not possible.
This commit is contained in:
Vasil Dimov 2023-02-09 14:03:41 +01:00
parent 64d6f77907
commit c42ded3d9b
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GPG key ID: 54DF06F64B55CBBF
1 changed files with 5 additions and 1 deletions
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6
src/test/fuzz/util/net.cpp
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@ -36,7 +36,11 @@ CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
} else if (network == Network::NET_IPV6) {
if (fuzzed_data_provider.remaining_bytes() >= 16) {
in6_addr v6_addr = {};
memcpy(v6_addr.s6_addr, fuzzed_data_provider.ConsumeBytes<uint8_t>(16).data(), 16);
auto addr_bytes = fuzzed_data_provider.ConsumeBytes<uint8_t>(16);
if (addr_bytes[0] == CJDNS_PREFIX) { // Avoid generating IPv6 addresses that look like CJDNS.
addr_bytes[0] = 0x55; // Just an arbitrary number, anything != CJDNS_PREFIX would do.
}
memcpy(v6_addr.s6_addr, addr_bytes.data(), 16);
net_addr = CNetAddr{v6_addr, fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
}
} else if (network == Network::NET_INTERNAL) {