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eaf6be0114a6d7763767da9496907fe8a670ff9e [net processing] Do not request transaction relay from feeler connections (John Newbery)
0220b834b175dc8c45a2c60213474a72c0ef8193 [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 eaf6be0114a6d7763767da9496907fe8a670ff9e
MarcoFalke:
review ACK eaf6be0114a6d7763767da9496907fe8a670ff9e 🏃
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