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network: Only insert global addresses into the DHT. (#5735)

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* network: Only insert global addresses into the DHT.

Currently every address reported via libp2p-identify is inserted into
the DHT which thus contains a multitude of unreachable addresses such
as from 127.0.0.0/8 or 10.0.0.0/8.

Issue #5099 suggested a dedicated service over UDP to gauge the
reachability of an address, which would however incur extra I/O costs
and be of limited use.

As an alternative and simpler tactic, this PR only allows global IP
addresses to be inserted into the DHT unless an explicit command-line
flag `--allow-non-global-addresses-in-dht` is given or a node is
started with `--dev`. This opt-in behaviour is meant to allow
site-local networks to still make use of a DHT.

* Enable non-global in more test setups.

* Replace command-line option with different name.

* Another test fix.
This commit is contained in:
Toralf Wittner
2020-04-23 09:52:20 +02:00
committed by GitHub
parent 96b7cec1ce
commit 421ef498f4
8 changed files with 67 additions and 8 deletions
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substrate/client/network/src/service.rs
+1
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@@ -246,6 +246,7 @@ impl<B: BlockT + 'static, H: ExHashT> NetworkWorker<B, H> {
config.with_user_defined(known_addresses);
config.discovery_limit(u64::from(params.network_config.out_peers) + 15);
config.add_protocol(params.protocol_id.clone());
config.allow_non_globals_in_dht(params.network_config.allow_non_globals_in_dht);
match params.network_config.transport {
TransportConfig::MemoryOnly => {