8346004ac8
420695c193contrib: recognize CJDNS seeds as such (Vasil Dimov)f9c28330a0net: take the first 4 random bits from CJDNS addresses in GetGroup() (Vasil Dimov)29ff79c0a2net: relay CJDNS addresses even if we are not connected to CJDNS (Vasil Dimov)d96f8d304cnet: don't skip CJDNS from GetNetworkNames() (Vasil Dimov)c2d751abbanet: take CJDNS into account in CNetAddr::GetReachabilityFrom() (Vasil Dimov)9b43b3b257test: extend feature_proxy.py to test CJDNS (Vasil Dimov)508eb258fdtest: remove default argument of feature_proxy.py:node_test() (Vasil Dimov)6387f397b3net: recognize CJDNS addresses as such (Vasil Dimov)e6890fcb44net: don't skip CJDNS from GetNetworksInfo() (Vasil Dimov)e9d90d3c11net: introduce a new config option to enable CJDNS (Vasil Dimov)78f456c576net: recognize CJDNS from ParseNetwork() (Vasil Dimov)de01e312b3net: use -proxy for connecting to the CJDNS network (Vasil Dimov)aedd02ef27net: make it possible to connect to CJDNS addresses (Vasil Dimov) Pull request description: CJDNS overview ===== CJDNS is like a distributed, shared VPN with multiple entry points where every participant can reach any other participant. All participants use addresses from the `fc00::/8` network (reserved IPv6 range). Installation and configuration is done outside of applications, similarly to VPN (either in the host/OS or on the network router). Motivation ===== Even without this PR it is possible to connect two Bitcoin Core nodes through CJDNS manually by using e.g. `-addnode` in environments where CJDNS is set up. However, this PR is necessary for address relay to work properly and automatic connections to be made to CJDNS peers. I.e. to make CJDNS a first class citizen network like IPv4, IPv6, Tor and I2P. Considerations ===== An address from the `fc00::/8` network, could mean two things: 1. Part of a local network, as defined in RFC 4193. Like `10.0.0.0/8`. Bitcoin Core could be running on a machine with such address and have peers with those (e.g. in a local network), but those addresses are not relayed to other peers because they are not globally routable on the internet. 2. Part of the CJDNS network. This is like Tor or I2P - if we have connectivity to that network then we could reach such peers and we do relay them to other peers. So, Bitcoin Core needs to be able to tell which one is it when it encounters a bare `fc00::/8` address, e.g. from `-externalip=` or by looking up the machine's own addresses. Thus a new config option is introduced `-cjdnsreacable`: * `-cjdnsreacable=0`: it is assumed a `fc00::/8` address is a private IPv6 (1.) * `-cjdnsreacable=1`: it is assumed a `fc00::/8` address is a CJDNS one (2.) After setting up CJDNS outside of Bitcoin Core, a node operator only needs to enable this option. Addresses from P2P relay/gossip don't need that because they are properly tagged as IPv6 or as CJDNS. For testing ===== ``` [fc32:17ea:e415:c3bf:9808:149d:b5a2:c9aa]:8333 [fc68:7026:cb27:b014:5910:e609:dcdb:22a2]:8333 [fcb3:dc50:e1ae:7998:7dc0:7fa6:4582:8e46]:8333 [fcc7:be49:ccd1:dc91:3125:f0da:457d:8ce]:8333 [fcf2:d9e:3a25:4eef:8f84:251b:1b4d:c596]:8333 ``` ACKs for top commit: dunxen: ACK420695cjonatack: re-ACK420695c193per `git range-diff23ae7934fbff39 420695c` laanwj: Code review ACK420695c193Tree-SHA512: 21559886271aa84671d52b120fa3fa5a50fdcf0fcb26e5b32049c56fab0d606438d19dd366a9c8ce612d3894237ae6d552ead3338b326487e3534399b88a317a
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
Further information about Bitcoin Core is available in the doc folder.
What is Bitcoin?
Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
For more information read the original Bitcoin whitepaper.
License
Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.
Development Process
The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be
completely stable. Tags are created
regularly from release branches to indicate new official, stable release versions of Bitcoin Core.
The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.
The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.
Testing
Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.
Automated Testing
Developers are strongly encouraged to write unit tests for new code, and to
submit new unit tests for old code. Unit tests can be compiled and run
(assuming they weren't disabled in configure) with: make check. Further details on running
and extending unit tests can be found in /src/test/README.md.
There are also regression and integration tests, written
in Python.
These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py
The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
Manual Quality Assurance (QA) Testing
Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.
Translations
Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.
Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.
Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.