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W. J. van der Laan 8346004ac8
Merge bitcoin/bitcoin#23077: Full CJDNS support 
420695c193 contrib: recognize CJDNS seeds as such (Vasil Dimov)
f9c28330a0 net: take the first 4 random bits from CJDNS addresses in GetGroup() (Vasil Dimov)
29ff79c0a2 net: relay CJDNS addresses even if we are not connected to CJDNS (Vasil Dimov)
d96f8d304c net: don't skip CJDNS from GetNetworkNames() (Vasil Dimov)
c2d751abba net: take CJDNS into account in CNetAddr::GetReachabilityFrom() (Vasil Dimov)
9b43b3b257 test: extend feature_proxy.py to test CJDNS (Vasil Dimov)
508eb258fd test: remove default argument of feature_proxy.py:node_test() (Vasil Dimov)
6387f397b3 net: recognize CJDNS addresses as such (Vasil Dimov)
e6890fcb44 net: don't skip CJDNS from GetNetworksInfo() (Vasil Dimov)
e9d90d3c11 net: introduce a new config option to enable CJDNS (Vasil Dimov)
78f456c576 net: recognize CJDNS from ParseNetwork() (Vasil Dimov)
de01e312b3 net: use -proxy for connecting to the CJDNS network (Vasil Dimov)
aedd02ef27 net: 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:
    ACK 420695c
  jonatack:
    re-ACK 420695c193 per `git range-diff 23ae793 4fbff39 420695c`
  laanwj:
    Code review ACK 420695c193

Tree-SHA512: 21559886271aa84671d52b120fa3fa5a50fdcf0fcb26e5b32049c56fab0d606438d19dd366a9c8ce612d3894237ae6d552ead3338b326487e3534399b88a317a
2021-11-08 14:44:37 +01:00
.github doc: Remove label from good first issue template 2020-08-24 09:31:24 +02:00
.tx qt: Bump transifex slug for 22.x 2021-04-21 13:46:41 +02:00
build-aux/m4 build: no-longer fail default configure if BDB isn't available 2021-10-05 11:38:28 +08:00
build_msvc Remove the build_msvc/testconsensus project 2021-11-06 21:32:34 +00:00
ci Merge bitcoin/bitcoin#23458: ci: Do not print git log for empty COMMIT_RANGE 2021-11-08 09:32:11 +01:00
contrib contrib: recognize CJDNS seeds as such 2021-11-03 14:58:55 +01:00
depends Merge bitcoin/bitcoin#22783: build: Cleanup depends build system 2021-10-19 15:51:41 +08:00
doc Merge bitcoin/bitcoin#23464: doc: remove mention of system univalue from build-unix.md 2021-11-08 15:43:47 +08:00
share Remove -rescan startup parameter 2021-09-30 12:06:27 +13:00
src Merge bitcoin/bitcoin#23077: Full CJDNS support 2021-11-08 14:44:37 +01:00
test Merge bitcoin/bitcoin#23077: Full CJDNS support 2021-11-08 14:44:37 +01:00
.cirrus.yml ci: Add vcpkg tools cache 2021-10-22 14:33:04 +03:00
.editorconfig ci: Drop AppVeyor CI integration 2021-09-07 06:12:53 +03:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore build: add *~ to .gitignore 2021-05-12 18:10:47 +02:00
.python-version Bump minimum python version to 3.6 2020-11-09 17:53:47 +10:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac fuzz: Add wallet fuzz test 2021-10-22 12:43:18 +02:00
CONTRIBUTING.md Enable TLS in links in documentation 2021-09-16 22:00:20 +00:00
COPYING doc: Update license year range to 2021 2020-12-30 16:24:47 +01:00
INSTALL.md doc: Added hyperlink for doc/build 2021-09-09 19:53:12 +05:30
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am scripts: remove pixie.py 2021-10-12 08:36:21 +08:00
README.md doc: Rework internal and external links 2021-02-17 09:18:46 +01:00
REVIEWERS release: remove gitian 2021-08-31 09:37:23 +08:00
SECURITY.md doc: update SECURITY.md inline with recent changes to bitcoincore.org 2021-11-06 18:05:07 +08:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

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.