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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/tor.md
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@@ -56,11 +56,7 @@ outgoing connections, but more is possible.
-onlynet=onion Make outgoing connections only to .onion addresses. Incoming
connections are not affected by this option. This option 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.
onlynet=onion, onlynet=i2p.
In a typical situation, this suffices to run behind a Tor proxy: