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Merge bitcoin/bitcoin#22777: net processing: don't request tx relay on feeler connections

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eaf6be0114 [net processing] Do not request transaction relay from feeler connections (John Newbery)
0220b834b1 [test] Add testing for outbound feeler connections (John Newbery)

Pull request description:

  Feelers are short-lived connections used to test the viability of peers. The bitcoind node will periodically open feeler connections to addresses in its addrman, wait for a `version` message from the peer, and then close the connection.

  Currently, we set `fRelay` to `1` in the `version` message for feeler connections, indicating that we want the peer to relay transactions to us. However, we close the connection immediately on receipt of the `version` message, and so never process any incoming transaction announcements. This PR changes that behaviour to instead set `fRelay` to `0` indicating that we do not wish to receive transaction announcements from the peer.

  This PR also extends the `addconnection` RPC to allow creating outbound feeler connections from the node to the test framework, and a test to verify that the node sets `fRelay` to `0` in the `version` message to feeler connections.

ACKs for top commit:
  naumenkogs:
    ACK eaf6be0114
  MarcoFalke:
    review ACK eaf6be0114 🏃

Tree-SHA512: 1c56837dbd0a396fe404a5e39f7459864d15f666664d6b35ad109628b13158e077e417e586bf48946a23bd5cbe63716cb4bf22cdf8781b74dfce6047b87b465a
This commit is contained in:
MarcoFalke
2021-12-14 17:57:02 +01:00
parent 498fe4b780 eaf6be0114
commit 9635760ce8
6 changed files with 36 additions and 10 deletions
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4
src/net.cpp
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@ -1225,7 +1225,6 @@ bool CConnman::AddConnection(const std::string& address, ConnectionType conn_typ
switch (conn_type) {
case ConnectionType::INBOUND:
case ConnectionType::MANUAL:
case ConnectionType::FEELER:
return false;
case ConnectionType::OUTBOUND_FULL_RELAY:
max_connections = m_max_outbound_full_relay;
@ -1236,6 +1235,9 @@ bool CConnman::AddConnection(const std::string& address, ConnectionType conn_typ
// no limit for ADDR_FETCH because -seednode has no limit either
case ConnectionType::ADDR_FETCH:
break;
// no limit for FEELER connections since they're short-lived
case ConnectionType::FEELER:
break;
} // no default case, so the compiler can warn about missing cases
// Count existing connections