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Merge bitcoin/bitcoin#22648: doc, test: improve i2p/tor docs and i2p reachable unit tests
0175977 Add I2P network SetReachable/IsReachable unit test assertions (Jon Atack) b87a9c4 Improve doc/i2p.md regarding I2P router options/versions (Jon Atack) bebcf78 Update i2p.md and tor.md regarding -onlynet config option (Jon Atack) Pull request description: This pull addresses bitcoin/bitcoin#22634 (comment) and various user feedback/questions, updates the -onlynet documentation in doc/i2p.md and doc/tor.md per #22651 (src/init.cpp is already fine) and fills in some missing I2P unit test coverage. Note: this PR depends in part on whether #22651 is merged in order to propose the correct -onlynet documentation (it is currently aligned with the change in #22651), so that PR should be decided or merged first. ACKs for top commit: Rspigler: Re-ACK 0175977 prayank23: reACK bitcoin/bitcoin@0175977 vasild: ACK 0175977 Tree-SHA512: ae606437522bfccdfb7508108cddc7dfede2385e30a0561dbd007b784ed2639962c28552eb0e9336412faa323637fe964c26b8d8fc6dcf9fc63734ac00d05736
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‎doc/i2p.md

Lines changed: 39 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -10,11 +10,22 @@ started with I2P terminology.
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## Run Bitcoin Core with an I2P router (proxy)
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A running I2P router (proxy) with [SAM](https://geti2p.net/en/docs/api/samv3)
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enabled is required (there is an [official one](https://geti2p.net) and
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[a few alternatives](https://en.wikipedia.org/wiki/I2P#Routers)). Notice the IP
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address and port the SAM proxy is listening to; usually, it is
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`127.0.0.1:7656`. Once it is up and running with SAM enabled, use the following
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Bitcoin Core options:
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enabled is required. Options include:
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- [i2prouter (I2P Router)](https://geti2p.net), the official implementation in
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Java
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- [i2pd (I2P Daemon)](https://github.com/PurpleI2P/i2pd)
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([documentation](https://i2pd.readthedocs.io/en/latest)), a lighter
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alternative in C++ (successfully tested with version 2.23 and up; version 2.36
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or later recommended)
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- [i2p-zero](https://github.com/i2p-zero/i2p-zero)
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- [other alternatives](https://en.wikipedia.org/wiki/I2P#Routers)
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Note the IP address and port the SAM proxy is listening to; usually, it is
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`127.0.0.1:7656`.
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Once an I2P router with SAM enabled is up and running, use the following Bitcoin
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Core configuration options:
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```
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-i2psam=<ip:port>
@@ -42,15 +53,30 @@ named `i2p_private_key` in the Bitcoin Core data directory.
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## Additional configuration options related to I2P
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You may set the `debug=i2p` config logging option to have additional
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information in the debug log about your I2P configuration and connections. Run
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`bitcoin-cli help logging` for more information.
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```
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-debug=i2p
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```
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Set the `debug=i2p` config logging option to see additional information in the
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debug log about your I2P configuration and connections. Run `bitcoin-cli help
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logging` for more information.
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```
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-onlynet=i2p
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```
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Make outgoing connections only to I2P addresses. Incoming connections are not
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affected by this option. It can be specified multiple times to allow multiple
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network types, e.g. onlynet=ipv4, onlynet=ipv6, onlynet=onion, onlynet=i2p.
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Warning: if you use -onlynet with values other than onion, and the -onion or
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-proxy option is set, then outgoing onion connections will still be made; use
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-noonion or -onion=0 to disable outbound onion connections in this case.
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It is possible to restrict outgoing connections in the usual way with
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`onlynet=i2p`. I2P support was added to Bitcoin Core in version 22.0 (mid-2021)
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and there may be fewer I2P peers than Tor or IP ones. Therefore, using
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`onlynet=i2p` alone (without other `onlynet=`) may make a node more susceptible
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to [Sybil attacks](https://en.bitcoin.it/wiki/Weaknesses#Sybil_attack). Use
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I2P support was added to Bitcoin Core in version 22.0 and there may be fewer I2P
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peers than Tor or IP ones. Therefore, using I2P alone without other networks may
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make a node more susceptible to [Sybil
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attacks](https://en.bitcoin.it/wiki/Weaknesses#Sybil_attack). You can use
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`bitcoin-cli -addrinfo` to see the number of I2P addresses known to your node.
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Another consideration with `onlynet=i2p` is that the initial blocks download

‎doc/tor.md

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -57,11 +57,11 @@ outgoing connections, but more is possible.
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-onlynet=onion Make outgoing connections only to .onion addresses. Incoming
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connections are not affected by this option. This option can be
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specified multiple times to allow multiple network types, e.g.
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ipv4, ipv6 or onion. If you use this option with values other
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than onion you *cannot* disable onion connections; outgoing onion
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connections will be enabled when you use -proxy or -onion. Use
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-noonion or -onion=0 if you want to be sure there are no outbound
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onion connections over the default proxy or your defined -proxy.
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onlynet=ipv4, onlynet=ipv6, onlynet=onion, onlynet=i2p.
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Warning: if you use -onlynet with values other than onion, and
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the -onion or -proxy option is set, then outgoing onion
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connections will still be made; use -noonion or -onion=0 to
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disable outbound onion connections in this case.
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In a typical situation, this suffices to run behind a Tor proxy:
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‎src/test/net_tests.cpp

Lines changed: 24 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -627,37 +627,42 @@ BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
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BOOST_AUTO_TEST_CASE(LimitedAndReachable_Network)
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{
630-
BOOST_CHECK_EQUAL(IsReachable(NET_IPV4), true);
631-
BOOST_CHECK_EQUAL(IsReachable(NET_IPV6), true);
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BOOST_CHECK_EQUAL(IsReachable(NET_ONION), true);
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BOOST_CHECK(IsReachable(NET_IPV4));
631+
BOOST_CHECK(IsReachable(NET_IPV6));
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BOOST_CHECK(IsReachable(NET_ONION));
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BOOST_CHECK(IsReachable(NET_I2P));
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SetReachable(NET_IPV4, false);
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SetReachable(NET_IPV6, false);
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SetReachable(NET_ONION, false);
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SetReachable(NET_I2P, false);
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BOOST_CHECK_EQUAL(IsReachable(NET_IPV4), false);
639-
BOOST_CHECK_EQUAL(IsReachable(NET_IPV6), false);
640-
BOOST_CHECK_EQUAL(IsReachable(NET_ONION), false);
640+
BOOST_CHECK(!IsReachable(NET_IPV4));
641+
BOOST_CHECK(!IsReachable(NET_IPV6));
642+
BOOST_CHECK(!IsReachable(NET_ONION));
643+
BOOST_CHECK(!IsReachable(NET_I2P));
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SetReachable(NET_IPV4, true);
643646
SetReachable(NET_IPV6, true);
644647
SetReachable(NET_ONION, true);
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SetReachable(NET_I2P, true);
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646-
BOOST_CHECK_EQUAL(IsReachable(NET_IPV4), true);
647-
BOOST_CHECK_EQUAL(IsReachable(NET_IPV6), true);
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BOOST_CHECK_EQUAL(IsReachable(NET_ONION), true);
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BOOST_CHECK(IsReachable(NET_IPV4));
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BOOST_CHECK(IsReachable(NET_IPV6));
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BOOST_CHECK(IsReachable(NET_ONION));
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BOOST_CHECK(IsReachable(NET_I2P));
649654
}
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651656
BOOST_AUTO_TEST_CASE(LimitedAndReachable_NetworkCaseUnroutableAndInternal)
652657
{
653-
BOOST_CHECK_EQUAL(IsReachable(NET_UNROUTABLE), true);
654-
BOOST_CHECK_EQUAL(IsReachable(NET_INTERNAL), true);
658+
BOOST_CHECK(IsReachable(NET_UNROUTABLE));
659+
BOOST_CHECK(IsReachable(NET_INTERNAL));
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656661
SetReachable(NET_UNROUTABLE, false);
657662
SetReachable(NET_INTERNAL, false);
658663

659-
BOOST_CHECK_EQUAL(IsReachable(NET_UNROUTABLE), true); // Ignored for both networks
660-
BOOST_CHECK_EQUAL(IsReachable(NET_INTERNAL), true);
664+
BOOST_CHECK(IsReachable(NET_UNROUTABLE)); // Ignored for both networks
665+
BOOST_CHECK(IsReachable(NET_INTERNAL));
661666
}
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663668
CNetAddr UtilBuildAddress(unsigned char p1, unsigned char p2, unsigned char p3, unsigned char p4)
@@ -676,10 +681,10 @@ BOOST_AUTO_TEST_CASE(LimitedAndReachable_CNetAddr)
676681
CNetAddr addr = UtilBuildAddress(0x001, 0x001, 0x001, 0x001); // 1.1.1.1
677682

678683
SetReachable(NET_IPV4, true);
679-
BOOST_CHECK_EQUAL(IsReachable(addr), true);
684+
BOOST_CHECK(IsReachable(addr));
680685

681686
SetReachable(NET_IPV4, false);
682-
BOOST_CHECK_EQUAL(IsReachable(addr), false);
687+
BOOST_CHECK(!IsReachable(addr));
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684689
SetReachable(NET_IPV4, true); // have to reset this, because this is stateful.
685690
}
@@ -691,12 +696,12 @@ BOOST_AUTO_TEST_CASE(LocalAddress_BasicLifecycle)
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692697
SetReachable(NET_IPV4, true);
693698

694-
BOOST_CHECK_EQUAL(IsLocal(addr), false);
695-
BOOST_CHECK_EQUAL(AddLocal(addr, 1000), true);
696-
BOOST_CHECK_EQUAL(IsLocal(addr), true);
699+
BOOST_CHECK(!IsLocal(addr));
700+
BOOST_CHECK(AddLocal(addr, 1000));
701+
BOOST_CHECK(IsLocal(addr));
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698703
RemoveLocal(addr);
699-
BOOST_CHECK_EQUAL(IsLocal(addr), false);
704+
BOOST_CHECK(!IsLocal(addr));
700705
}
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BOOST_AUTO_TEST_SUITE_END()

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