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net: respect -onlynet= when making outbound connections

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Do not make outbound connections to hosts which belong to a network
which is restricted by `-onlynet`.

This applies to hosts that are automatically chosen to connect to and to
anchors.

This does not apply to hosts given to `-connect`, `-addnode`,
`addnode` RPC, dns seeds, `-seednodes`.

Fixes https://github.com/bitcoin/bitcoin/issues/13378
Fixes https://github.com/bitcoin/bitcoin/issues/22647
Supersedes https://github.com/bitcoin/bitcoin/pull/22651
This commit is contained in:
Vasil Dimov
2021-08-30 14:33:29 +02:00
parent 9394964f6b
commit e53a8505db
6 changed files with 45 additions and 25 deletions
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doc/i2p.md
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@@ -67,11 +67,7 @@ logging` for more information.
Make outgoing connections only to I2P addresses. Incoming connections are not
affected by this option. It can be specified multiple times to allow multiple
network types, e.g. onlynet=ipv4, onlynet=ipv6, onlynet=onion, onlynet=i2p.
Warning: if you use -onlynet with values other than onion, and the -onion or
-proxy option is set, then outgoing onion connections will still be made; use
-noonion or -onion=0 to disable outbound onion connections in this case.
network types, e.g. onlynet=onion, onlynet=i2p.
I2P support was added to Bitcoin Core in version 22.0 and there may be fewer I2P
peers than Tor or IP ones. Therefore, using I2P alone without other networks may