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@@ -1,3 +1,435 @@
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+Changes in version 0.4.1.1-alpha - 2019-05-??
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+ This is the first alpha in the 0.4.1.x series. It introduces
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+ lightweight circuit padding to make some onion-service circuits harder
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+ to distinguish, includes a new "authenticated SENDME" feature to make
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+ certain denial-of-service attacks more difficult, and improves
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+ performance in several areas.
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+
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+ o Major features (Circuit padding):
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+ - Onion service clients will now add padding cells to the initial
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+ portions of their INTRODUCE and RENDEZVOUS circuits, to make those
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+ circuits' traffic patterns look more like general purpose Exit
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+ traffic. The overhead for this is 2 extra cells in each direction
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+ for RENDEZVOUS circuits, and 1 extra upstream cell and 10
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+ downstream cells for INTRODUCE circuits. This will only be enabled
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+ if the circuit's middle node supports this feature, too. (Clients
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+ may specify fixed middle nodes with the MiddleNodes torrc
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+ directive, and may force-disable this feature with the
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+ CircuitPadding torrc directive). Closes ticket 28634.
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+
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+ o Major features (code organization):
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+ - Tor now includes a generic publish-subscribe message-passing
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+ subsystem that we can use to organize intermodule dependencies. We
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+ hope to use this to reduce dependencies between modules that don't
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+ need to be related, and to generally simplify our codebase. Closes
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+ ticket 28226.
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+
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+ o Major features (controller protocol):
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+ - Controller commands are now parsed using a generalized parsing
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+ subsystem. Previously, each controller command was responsible for
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+ parsing its own input. Closes ticket 30091.
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+
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+ o Major features (flow control):
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+ - Implement authenticated SENDMEs detailed in proposal 289. A SENDME
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+ cell now includes the digest of the last cell received so once the
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+ end point receives the SENDME, it can confirm the other side's
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+ knowledge of the previous cells that were sent. This behavior is
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+ controlled by two new consensus parameters, see proposal for more
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+ details. Fixes ticket 26288.
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+
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+ o Major features (performance):
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+ - Update our node selection algorithm to exclude nodes in linear
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+ time. Previously, the algorithm was quadratic, which could slow
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+ down heavily used onion services. Closes ticket 30307.
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+
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+ o Minor feature (circuit padding):
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+ - We now use a fast RNG when scheduling circuit padding. Part of
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+ ticket 28636.
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+
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+ o Minor feature (maintenance scripts):
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+ - Add to scripts/maint/ helper maintainer scripts used for git
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+ maintenance. Closes ticket 29391.
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+
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+ o Minor features (circuit padding):
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+ - Allow the padding machine designer to pick the edges of their
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+ histogram instead of trying to compute them automatically using an
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+ exponential formula. Resolves some undefined behavior in the case
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+ of small histograms and allows greater flexibility on machine
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+ design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
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+ - Provide the ability for circuit padding machines to hold a circuit
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+ open until they are done padding it. Closes ticket 28780.
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+
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+ o Minor features (compile-time modules):
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+ - Add a --list-modules command to print a list of which compile-time
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+ modules are enabled. Closes ticket 30452.
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+
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+ o Minor features (continuous integration):
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+ - Remove sudo configuration lines from .travis.yml as they are no
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+ longer needed with current Travis build environment. Resolves
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+ issue 30213.
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+
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+ o Minor features (controller):
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+ - Add onion service version 3 support to HSFETCH. Previously, only
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+ version 2 onion services were supported. Closes ticket 25417.
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+ Patch by Neel Chauhan
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+
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+ o Minor features (debugging):
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+ - Introduce tor_assertf() and tor_assertf_nonfatal() to enable
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+ logging of additional information during assert failure. Now we
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+ can use format strings to include pieces of information that are
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+ relevant for trouble shooting. Resolves ticket 29662.
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+
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+ o Minor features (defense in depth):
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+ - In smartlist_remove_keeporder(), set any pointers that become
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+ unused to NULL, in case a bug causes them to be used later. Closes
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+ ticket 30176. Patch from Tobias Stoeckmann.
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+ - Tor now uses a fast cryptographically strong PRNG even for
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+ decisions that we do not believe are security-sensitive.
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+ Previously, for performance reasons, we had used a trivially
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+ predictable linear congruential generator algorithm for certain
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+ load-balancing and statistical sampling decisions. Now we use our
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+ fast RNG in those cases. Closes ticket 29542.
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+
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+ o Minor features (developer tooling):
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+ - Call practracker from pre-push and pre-commit git hooks to let a
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+ developer know if they made any code style violations in their
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+ last commit. This should help preventing code style violations
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+ appearing upstream. Closes ticket 30051.
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+ - Call pre-commit git hook from pre-push hook to make sure we're
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+ running documentation and code style checks before pushing to
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+ remote git repository. Implements feature 30033.
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+ - Modify git pre-push hook script to disallow pushing branches other
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+ than master, release-* and maint-* to origin remote. Implements
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+ feature 29532.
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+
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+ o Minor features (developer tools):
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+ - Add a script to check that each header has a well-formed and
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+ unique guard marco. Closes ticket 29756.
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+ - Introduce a post-merge git hook script to check if we're pulling
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+ in any changes to our git workspace management scripts from
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+ upstream. Resolves issue 29588.
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+
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+ o Minor features (development tools):
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+ - Tor's test scripts now check for files and functions that seem too
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+ long and complicated. Existing overlong functions and files are
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+ accepted for now, but should eventually be refactored. Closes
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+ ticket 29221.
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+
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+ o Minor features (geoip):
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+ - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
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+ Country database. Closes ticket 30522.
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+
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+ o Minor features (git scripts):
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+ - In git-pull-all.sh, also fetch the latest tor-github pull
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+ requests. Implements ticket 30114.
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+
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+ o Minor features (HTTP tunnel):
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+ - Return an informative web page when the HTTPTunnelPort is used as
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+ an HTTP proxy. Closes ticket 27821, patch by "eighthave".
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+
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+ o Minor features (IPv6, v3 onion services):
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+ - Make v3 onion services put IPv6 addresses in service descriptors.
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+ Before this change, service descriptors only contained IPv4
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+ addressesd. Implements 26992.
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+
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+ o Minor features (modularity):
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+ - The --disable-module-dirauth compile-time option now disables even
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+ more dirauth-only code. Closes ticket 30345.
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+
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+ o Minor features (performance):
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+ - Use OpenSSL's implementations of SHA3 when available (in OpenSSL
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+ 1.1.1 and later), since they tend to be faster than tiny-keccak.
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+ Closes ticket 28837.
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+
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+ o Minor features (performance, RNG):
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+ - Tor now constructs a fast secure pseudorandom number generator for
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+ each thread, to use for cases where performance is critical. This
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+ PRNG is based on AES-CTR, using a buffering construction similar
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+ to libottery and the (newer) OpenBSD arc4random() code. It
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+ outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
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+ small outputs. Although we believe it to be cryptographically
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+ strong, we are only using it when necessary for reasonable
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+ performance. Implements tickets 29023 and 29536.
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+
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+ o Minor features (testing):
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+ - Tor's unit test code now contains a standard set of functions to
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+ replace the PRNG with a deterministic or reproducible version for
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+ testing. Previously, various tests implemented this in various
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+ ways. Implements ticket 29732.
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+ - We now have a script, cov-test-determinism.sh, to identify places
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+ where our unit test coverage has become nondeterministic. Closes
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+ ticket 29436.
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+
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+ o Minor bugfixes (bridge authority):
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+ - We set bridges as running when we dump the bridge status to a
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+ file. Previously, we set bridges as running in a GETINFO
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+ controller, but these shouldn't modify vital data structures.
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+ Fixes bug 24490; bugfix on 0.2.0.13-alpha. Patch by Neel Chauhan
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+
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+ o Minor bugfixes (Channel padding statistics):
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+ - Channel padding write totals and padding-enabled totals are now
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+ counted properly in relay extrainfo descriptors. Fixes bug 29231;
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+ bugfix on 0.3.1.1-alpha
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+
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+ o Minor bugfixes (circuit padding):
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+ - Add a torrc option to disable circuit padding. Fixes bug 28693;
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+ bugfix on 0.4.0.1-alpha.
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+ - Allow circuit padding machines to specify that they do not
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+ contribute much overhead, and provide consensus flags and torrc
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+ options to force clients to only use low overhead machines. Fixes
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+ bug 29203; bugfix on 0.4.0.1-alpha.
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+ - Provide consensus parameter to fully disable circuit padding, to
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+ be used in emergency network overload situations. Fixes bug 30173;
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+ bugfix on 0.4.0.1-alpha.
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+ - The circuit padding subsystem does not schedule padding if dormant
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+ mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
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+
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+ o Minor bugfixes (circuitpadding):
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+ - Inspect circuit-level cell queue before sending padding, to avoid
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+ sending padding while too much data is queued. Fixes bug 29204;
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+ bugfix on 0.4.0.1-alpha.
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+
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+ o Minor bugfixes (compilation, unusual configuration):
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+ - Avoid failures when building with ALL_BUGS_ARE_FAILED due to
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+ missing declarations of abort(), and prevent other such failures
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+ in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
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+
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+ o Minor bugfixes (controller protocol):
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+ - Teach the controller parser to correctly distinguish an object
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+ preceded by an argument list from one without. Previously, it
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+ couldn't distinguish an argument list from the first line of a
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+ multiline object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
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+
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+ o Minor bugfixes (developer tools):
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+ - Update our pre-commit.git-hook script to work correctly on older
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+ Tor branches and release branches without any changes files, and
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+ to actually exit when something fails. Fixes bug 29553; bugfix
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+ on 0.4.0.2-alpha.
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+
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+ o Minor bugfixes (dirauth, ipv6):
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+ - If we are a durauth with IPv6 and are marking relays as running,
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+ mark ourselves as reachable on IPv6. Fixes bug 24338; bugfix on
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+ 0.4.0.2-alpha. Patch by Neel Chauhan
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+
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+ o Minor bugfixes (documentation):
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+ - Improve the documentation for MapAddress .exit. Fixes bug 30109;
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+ bugfix on 0.1.0.1-rc.
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+ - Improve the monotonic time module and function documentation.
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+ Explain what "monotonic" actually means, and document some results
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+ that have surprised people. Fixes bug 29640; bugfix
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+ on 0.2.9.1-alpha.
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+
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+ o Minor bugfixes (documentation, manpage):
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+ - Use proper formatting when providing an example on quoting options
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+ that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
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+
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+ o Minor bugfixes (lib):
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+
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+ o Minor bugfixes (logging):
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+ - Do not log a warning for OpenSSL versions that should be
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+ compatible. Fixes bug 30190; bugfix on 0.2.4.2-alpha
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+
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+ o Minor bugfixes (logging, configuration):
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+ - Warn operators when MyFamily option is set but ContactInfo is
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+ missing, as the latter should be set too. Fixes bug 25110; bugfix
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+ on 0.3.3.1-alpha.
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+
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+ o Minor bugfixes (memory leak):
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+ - Avoid a minor memory leak that could occur on relays when creating
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+ a keys directory failed. Fixes bug 30148; bugfix on 0.3.3.1-alpha.
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+
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+ o Minor bugfixes (onion services):
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+ - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
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+ implemenation) when failing to load an onion service client
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+ authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
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+ - If we are launching repeated HSFETCH queries and are rate-limited,
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+ we introduce a new controller response QUERY_RATE_LIMITED instead
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+ of QUERY_NO_HSDIR, while keeping the latter for when onion service
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+ directories are missing a descriptor. Previously, we returned
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+ QUERY_NO_HSDIR for both cases. Fixes bug 28269; bugfix on
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+ 0.3.1.1-alpha. Patch by Neel Chauhan
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+ - If we are relaunching a circuit to a rendevous service in
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+ rend_service_relaunch_rendezvous() and
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+ hs_service_requires_uptime_circ() is true, the
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+ CIRCLAUNCH_NEED_UPTIME flag is added to the circuit. Previously,
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+ we only set this flag when we received a INTRODUCE2 cell in
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+ rend_service_receive_introduction(). Fixes bug 17357; bugfix on
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+ 0.4.0.2-alpha. Patch by Neel Chauhan
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+
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+ o Minor bugfixes (onion services, performance):
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+ - If we are building circuits to onion services, in
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+ circuit_is_acceptable() we only call tor_addr_parse() in places
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+ where we use the returned family and address values from this
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+ function. Previously, we called tor_addr_parse() in
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+ circuit_is_acceptable() even if it wasn't used. This change will
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+ improve performance when building circuits. Fixes bug 22210;
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+ bugfix on 0.2.8.12. Patch by Neel Chauhan
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+
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+ o Minor bugfixes (performance):
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+ - When checking a node for bridge status, use a fast check to make
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+ sure that its identity is set. Previously, we used a constant-time
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+ check, which is not necessary when verifying a BUG() condition that
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+ causes a stack trace. Fixes bug 30308; bugfix on 0.3.5.1-alpha.
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+
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+ o Minor bugfixes (pluggable transports):
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+ - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
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+ well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
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+
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+ o Minor bugfixes (probability distributions):
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+ - Refactor and improve parts of the probability distribution code
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+ that made Coverity complain. Fixes bug 29805; bugfix
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+ on 0.4.0.1-alpha.
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+
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+ o Minor bugfixes (python):
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+ - Stop assuming that /usr/bin/python3 exists. For scripts that work
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+ with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
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+ python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
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+
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+ o Minor bugfixes (relay):
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+ - If we are are a relay and have IPv6Exit to 1 while ExitRelay is
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+ auto, we act as if ExitRelay is 1. Previously, we ignored IPv6Exit
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+ if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
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+ 0.3.5.1-alpha. Patch by Neel Chauhan.
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+
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+ o Minor bugfixes (stats):
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+ - When ExtraInfoStatistics is 0, stop including bandwidth usage
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+ statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
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+ bridge statistics by country in extra-info documents. Fixes bug
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+ 29018; bugfix on 0.2.4.1-alpha.
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+
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+ o Minor bugfixes (testing):
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+ - Call setrlimit() to disable core dumps in test_bt_cl.c instead of
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+ using `ulimit -c` in test_bt.sh, which violates POSIX shell
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+ compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
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+
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+ o Minor bugfixes (testing, v3 onion services):
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+ - Fix some incorrect code in the v3 onion service unit tests. Fixes
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+ bug 29243; bugfix on 0.3.2.1-alpha.
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+
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+ o Minor bugfixes (tor-resolve):
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+ - Fix a memory leak in tor-resolve that could happen if Tor gave it
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+ a malformed SOCKS response. (Memory leaks in tor-resolve don't
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+ actually matter, but it's good to fix them anyway.) Fixes bug
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+ 30151; bugfix on 0.4.0.1-alpha.
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+
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+ o Minor bugfixes (unit tests):
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+ - In the "routerkeys/*" tests, check the return values of mkdir()
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+ for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
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+ Found by Coverity as CID 1444254.
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+ - Split test_utils_general() to several smaller test functions in
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+ test_utils_general(). This makes it easier to perform resource
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+ deallocation on assert failure and fixes Coverity warnings CID
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+ 1444117 and CID 1444118. Fixes bug 29823; bugfix on 0.2.9.1-alpha.
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+
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+ o Minor bugfixes (v3 onion services):
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+ - Stop ignoring IPv6 link specifiers sent to v3 onion services. v3
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+ onion service IPv6 support is still incomplete, see 23493 for
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+ details. Fixes bug 23588; bugfix on 0.3.2.1-alpha. Patch by
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+ Neel Chauhan.
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+
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+ o Code simplification and refactoring:
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+ - Abstract out the low-level formatting of replies on the control
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+ port. Implements ticket 30007.
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+ - Add several assertions in an attempt to fix some Coverity
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+ warnings. Closes ticket 30149.
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+ - Introduce a connection_dir_buf_add() helper function that checks
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+ for compress_state of dir_connection_t and automatically writes a
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+ string to directory connection with or without compression.
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+ Resolves issue 28816.
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+ - Make the base32_decode() API return the number of bytes written,
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+ for consistency with base64_decode(). Closes ticket 28913.
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+ - Move most relay-only periodic events out of mainloop.c into the
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+ relay subsystem. Closes ticket 30414.
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+ - Refactor and encapsulate parts of the codebase that manipulate
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+ crypt_path_t objects. Resolves issue 30236.
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+ - Refactor several places in our code that coverity incorrectly
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+ believed that we might have memory leaks, so that we can analyze
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+ our software more easily. Closes ticket 30147.
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+ - Remove redundant return values in crypto_format, and the
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+ associated return value checks elsewhere in the code. Make the
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+ implementations in crypto_format consistent, and remove redundant
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+ code. Resolves ticket 29660.
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+ - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
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+ it is not a constant-time function. Closes ticket 30309.
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+ - Replace hs_desc_link_specifier_t with link_specifier_t, and remove
|
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+ all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
|
|
|
+ bugfix on 0.3.2.1-alpha.
|
|
|
+ - Simplify v3 onion service link specifier handling code. Fixes bug
|
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|
+ 23576; bugfix on 0.3.2.1-alpha.
|
|
|
+ - Split crypto_digest.c into three parts: 1) general code that does
|
|
|
+ not depend on either NSS or OpenSSL (stays in crypto_digest.c); 2)
|
|
|
+ code that depends on NSS API (moved to crypto_digest_nss.c); 3)
|
|
|
+ code that depends on OpenSSL API (moved to
|
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+ crypto_digest_openssl.c). Resolves ticket 29108.
|
|
|
+ - Split up the control.c file into several submodules, in
|
|
|
+ preparation for distributing its current responsibilities
|
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|
+ throughout the codebase. Closes ticket 29894.
|
|
|
+ - Start move responsibility for knowing about periodic events to the
|
|
|
+ appropriate subsystems, so that the mainloop doesn't need to know
|
|
|
+ all the periodic events in the rest of the codebase. Implements
|
|
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+ tickets 30293 and 30294.
|
|
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+
|
|
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+ o Documentation:
|
|
|
+ - Document how to find git commits and tags for bug fixes in
|
|
|
+ CodingStandards.md. And update some changes file documentation.
|
|
|
+ Closes ticket 30261.
|
|
|
+
|
|
|
+ o Removed features:
|
|
|
+ - Remove linux-tor-prio.sh script from contrib/operator-tools
|
|
|
+ directory. Resolves issue 29434.
|
|
|
+ - Remove obsolete OpenSUSE initscript. Resolves issue 30076.
|
|
|
+ - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
|
|
|
+ issue 30075.
|
|
|
+
|
|
|
+ o Testing:
|
|
|
+ - Check that representative subsets of values of `int` and `unsigned
|
|
|
+ int` can be represented by `void *`. Resolves issue 29537.
|
|
|
+
|
|
|
+ o Code simplification and refactoring (circuit padding):
|
|
|
+ - Avoid calling monotime_absolute_usec() in circuit padding machines
|
|
|
+ that do not use token removal or circuit RTT estimation. Fixes bug
|
|
|
+ 29085; bugfix on 0.4.0.1-alpha.
|
|
|
+
|
|
|
+ o Code simplification and refactoring (shell scripts):
|
|
|
+ - Cleanup autogen.sh to silence shellcheck warnings. Closes
|
|
|
+ ticket 26069.
|
|
|
+ - Cleanup test_keygen.sh to silence all shellcheck warnings. Closes
|
|
|
+ ticket 29062.
|
|
|
+ - Cleanup test_switch_id.sh to silence shellcheck warnings. Closes
|
|
|
+ ticket 29065.
|
|
|
+ - Fix issues shellcheck found in test_rebind.sh. Resolves
|
|
|
+ issue 29063.
|
|
|
+ - Fix shellcheck warning SC2006 in src/test/fuzz/minimize.sh.
|
|
|
+ Resolves issue 30079.
|
|
|
+ - Fix shellcheck warning in test_rust.sh. Fixes issue 29064.
|
|
|
+ - Fix shellcheck warning in torify script. Resolves issue 29070.
|
|
|
+ - Fix shellcheck warnings in asciidoc-helper.sh. Resolves
|
|
|
+ issue 29926.
|
|
|
+ - Fix shellcheck warnings in fuzz_multi.sh. Resolves issue 30077.
|
|
|
+ - Fix shellcheck warnings in fuzz_static_testcases.sh. Resolves
|
|
|
+ ticket 29059.
|
|
|
+ - Fix shellcheck warnings in nagios-check-tor-authority-cert script.
|
|
|
+ Resolves issue 29071.
|
|
|
+ - Fix shellcheck warnings in src/test/fuzz/fixup_filenames.sh.
|
|
|
+ Resolves issue 30078.
|
|
|
+ - Fix shellcheck warnings in test-network.sh. Resolves issue 29060.
|
|
|
+ - Fix shellcheck warnings in test_key_expiration.sh. Resolves
|
|
|
+ issue 30002.
|
|
|
+ - Fix shellcheck warnings in zero_length_keys.sh. Resolves
|
|
|
+ issue 29068.
|
|
|
+ - Fix test_workqueue_*.sh scripts to silence shellcheck SC2086
|
|
|
+ warnings. Fixes issue 29067.
|
|
|
+
|
|
|
+ o Testing (chutney):
|
|
|
+ - In "make test-network-all", test IPv6-only v3 single onion
|
|
|
+ services, using the chutney network single-onion-v23-ipv6-md. This
|
|
|
+ test will not pass until 23588 has been merged. Closes
|
|
|
+ ticket 27251.
|
|
|
+
|
|
|
+ o Testing (continuous integration):
|
|
|
+ - In Travis, show stem's tor log after failure. Closes ticket 30234.
|
|
|
+
|
|
|
+
|
|
|
Changes in version 0.4.0.5 - 2019-05-02
|
|
|
This is the first stable release in the 0.4.0.x series. It contains
|
|
|
improvements for power management and bootstrap reporting, as well as
|
Nick Mathewson