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Wladimir J. van der Laan ee7b67e278
Merge #9753: Add static_assert to prevent VARINT(<signed value>) 
499d95e27 Add static_assert to prevent VARINT(<signed value>) (Russell Yanofsky)

Pull request description:

  Using VARINT with signed types is dangerous because negative values will appear to serialize correctly, but then deserialize as positive values mod 128.

  This commit changes the VARINT macro to trigger a compile error by default if called with an signed value, and it updates existing broken uses of VARINT to pass a special flag that lets them keep working with no changes in behavior.

  There is some discussion about this issue here: https://github.com/bitcoin/bitcoin/pull/9693#issuecomment-278701473. I think another good change along these lines would be to make `GetSizeOfVarInt` and `WriteVarInt` throw exceptions if they are passed numbers less than 0 to serialize. But unlike this change, that would be a change in runtime behavior, and need more consideration.

Tree-SHA512: 082c65598cfac6dc1da042bdb47dbc9d5d789fc849fe52921cc238578588f4e5ff976c8b4b2ce42cb75290eb14f3b42ea76e26202c223c5b2aa63ef45c2ea3cc
2018-03-19 17:26:43 +01:00
.github Make default issue text all comments to make issues more readable 2017-11-16 11:50:56 -05:00
.tx tx: Update transifex slug for 0.16 2018-01-24 16:35:40 +01:00
build-aux/m4 ax_boost_{chrono,unit_test_framework}.m4: take changes from upstream 2018-03-15 19:59:11 +01:00
contrib Apply hardening measurements in bitcoind systemd service file 2018-03-14 08:11:07 +01:00
depends Merge #12625: depends: biplist 1.0.3 2018-03-14 14:29:27 +01:00
doc Document RPC method aliasing 2018-03-15 16:37:57 -04:00
share Increment MIT Licence copyright header year on files modified in 2017 2018-01-03 02:26:56 +09:00
src Merge #9753: Add static_assert to prevent VARINT(<signed value>) 2018-03-19 17:26:43 +01:00
test Merge #12553: Prefer wait_until over polling with time.sleep 2018-03-19 17:13:51 +01:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore [build] .gitignore: add QT Creator artifacts 2017-12-22 12:37:00 +01:00
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configure.ac Remove redundant checks for MSG_* from configure.ac 2018-03-15 20:02:00 +01:00
CONTRIBUTING.md [docs] links to code style guides 2017-11-20 13:47:01 +01:00
COPYING [Trivial] Update license year range to 2018 2018-01-01 04:33:09 +09:00
INSTALL.md Update INSTALL landing redirection notice for build instructions. 2016-10-06 12:27:23 +13:00
libbitcoinconsensus.pc.in Unify package name to as few places as possible without major changes 2015-12-14 02:11:10 +00:00
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README.md Rename test/pull-tester/rpc-tests.py to test/functional/test_runner.py 2017-03-20 10:40:31 -04:00

README.md

Bitcoin Core integration/staging tree

Build Status

https://bitcoincore.org

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, as well as an immediately useable, binary version of the Bitcoin Core software, see https://bitcoin.org/en/download, or read the original 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 and tested, but is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of Bitcoin Core.

The contribution workflow is described in CONTRIBUTING.md.

The developer mailing list should be used to discuss complicated or controversial changes before working on a patch set.

Developer IRC can be found on Freenode at #bitcoin-core-dev.

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, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The Travis CI system makes sure that every pull request is built for Windows, Linux, and OS X, 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.

Translators should also subscribe to the mailing list.