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@@ -1,3 +1,424 @@
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+Changes in version 0.3.3.1-alpha - 2018-01-??:
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+ Blurb goes here
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+
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+ o Major feature (channel):
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+ - Remove the incoming and outgoing channel queues. The reason to do
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+ so was due to the fact that they were always empty meaning never
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+ used but still looked at in our fast path. Bottom line, it was an
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+ unused code path.
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+ - The majority ot the channel unit tests have been rewritten and the
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+ code coverage has now been raised to 83.6% for channel.c. Closes
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+ ticket 23709.
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+ - We've simplify a lot the channel subsystem by removing those
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+ queues but also by removing a lot of unused code or dead code
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+ around it. Overall this is a cleanup removing more than 1500 lines
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+ of code overall and adding very little except for unit test.
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+
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+ o Major features (embedding):
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+ - There is now a documented stable API for programs that need to
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+ embed Tor. See tor_api.h for full documentation and known bugs.
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+ Closes ticket 23684.
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+ - Tor now has support for restarting in the same process.
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+ Controllers that run Tor using the "tor_api.h" interface can now
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+ restart Tor after Tor has exited. This support is incomplete,
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+ however: we have fixed the crash bugs that prevented it from
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+ working at all before, but many bugs probably remain, including
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+ the possibility of security issues. Implements ticket 24581.
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+
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+ o Major features (IPv6, directory documents):
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+ - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
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+ consensus. This makes it easier for IPv6 clients to bootstrap and
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+ choose reachable entry guards. Implements 23826.
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+ - Add consensus method 28, which removes IPv6 ORPorts from
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+ microdescriptors. Now that there are IPv6 ORPorts in the microdesc
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+ consensus, they are redundant in microdescs. This change is
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+ compatible with tor clients on 0.2.8.x and later. (0.2.8.x
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+ introduced client IPv6 bootstrap and guard support.)
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+ Implements 23828.
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+ - Expand the documentation for AuthDirHasIPv6Connectivity when it is
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+ set by different numbers of authorities. Fixes 23870
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+ on 0.2.4.1-alpha.
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+
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+ o Major features (onion service v3, control port):
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+ - Control port now supports command and events for v3 onion
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+ services. See proposal 284 for more information on what has been
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+ done exactly. Only the HSFETCH command hasn't been implemented at
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+ this stage because of a lack of use case with v3.
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+
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+ It is now possible to create ephemeral v3 services using the
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+ ADD_ONION command. Additionally, several events (HS_DESC,
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+ HS_DESC_CONTENT, CIRC and CIRC_MINOR) and commands (GETINFO,
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+ HSPOST, ADD_ONION and DEL_ONION) have been extended to support v3
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+ onion services. Closes ticket 20699.
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+
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+ o Major features (Onion Services):
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+ - Provide torrc options to pin the second and third hops of onion
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+ service circuits to a list of nodes. The option HSLayer2Guards
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+ pins the second hop, and the option HSLayer3Guards pins the third
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+ hop. Closes ticket 13837.
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+
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+ o Major features (relay):
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+ - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
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+ operator to use a more reasonable ("reduced") exit policy, rather
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+ than the default one. Closes ticket 13605. Patch from Neel Chauhan.
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+
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+ o Major features (Rust experimentation):
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+ - Tor now ships with an optional implementation of one of its
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+ smaller modules (protover.c) in the Rust programming language. To
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+ try it out, install a Rust build environment, and configure Tor
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+ with "--enable-rust --enable-cargo-online-mode". This should not
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+ cause any user-visible changes, but should help us gain more
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+ experience with Rust, and plan future Rust integration work.
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+ Implementation by Chelsea Komlo. Closes ticket 22840.
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+
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+ o Major features (storage):
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+ - Users can choose to store cached directory documents somewhere
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+ other than the DataDirectory by using the CacheDirectory option.
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+ Similarly, the storage location for relay's keys can be overridden
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+ with the KeyDirectory option. Closes ticket 22703.
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+
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+ o Major features (v3 onion services):
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+ - When v3 onion service clients send introduce cells, include the
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+ IPv6 address of the rendezvous point, if it has one. v3 onion
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+ services running 0.3.2 ignore IPv6 addresses. In future Tor
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+ versions, IPv6-only v3 single onion services can use IPv6
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+ addresses to connect directly to the rendezvous point. Closes
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+ ticket 23577. Patch by Neel Chauhan.
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+
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+ o Major bugfixes (onion services):
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+ - Fix an "off by 2" error in counting rendezvous failures on the
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+ onion service side. While we thought we would stop the rendezvous
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+ attempt after one failed circuit, we were actually making three
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+ circuit attempts before giving up. Now switch to a default of 2,
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+ and allow the consensus parameter "hs_service_max_rdv_failures" to
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+ override. Fixes bug 24895; bugfix on 0.0.6.
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+
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+ o Major bugfixes (relays):
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+ - Fix a set of false positives where relays would consider
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+ connections to other relays as being client-only connections (and
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+ thus e.g. deserving different link padding schemes) if those
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+ relays fell out of the consensus briefly. Now we look only at the
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+ initial handshake and whether the connection authenticated as a
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+ relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
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+
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+ o Major bugfixes (v3 onion services):
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+ - New-style (v3) onion services now obey the "max rendezvous circuit
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+ attempts" logic. Previously they would make as many rendezvous
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+ circuit attempts as they could fit in the MAX_REND_TIMEOUT second
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+ window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
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+
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+ o Minor feature (IPv6):
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+ - Make IPv6-only clients wait for microdescs for relays, even if we
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+ were previously using descriptors (or were using them as a bridge)
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+ and have a cached descriptor for them. Implements 23827.
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+ - When a consensus has IPv6 ORPorts, make IPv6-only clients use
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+ them, rather than waiting to download microdescriptors.
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+ Implements 23827.
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+
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+ o Minor features (API, embedding):
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+ - Tor can now start with a preauthenticated control connection
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+ created by the process that launched it. This feature is meant for
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+ use by programs that want to launch and manage a Tor process
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+ without allowing other programs to manage it as well. For more
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+ information, see the __OwningControllerFD option documented in
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+ control-spec.txt. Closes ticket 23900.
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+
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+ o Minor features (cleanup):
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+ - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
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+ when it stops. Closes ticket 23271.
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+
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+ o Minor features (code correctness, descriptors):
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+ - Check that microdesc ed25519 ids are non-zero in
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+ node_get_ed25519_id(), before returning them. Implements 24001,
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+ patch by "aruna1234".
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+
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+ o Minor features (defensive programming):
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+ - Most of the functions in Tor that free objects have been replaced
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+ with macros that free the objects and set the corresponding
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+ pointers to NULL. This change should help prevent a large class of
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+ dangling pointer bugs. Closes ticket 24337.
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+ - Where possible, the tor_free() macro now only evaluates its input
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+ once. Part of ticket 24337.
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+
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+ o Minor features (directory authority):
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+ - Make the "Exit" flag assignment only depend on whether the exit
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+ policy allows connections to ports 80 and 443. Previously relays
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+ would get the Exit flag if they allowed connections to one of
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+ these ports and also port 6667. Resolves ticket 23637.
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+
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+ o Minor features (embedding):
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+ - On most errors that would cause Tor to exit, it now tries to
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+ return from the tor_main() function, rather than calling the
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+ system exit() function. Most users won't notice a difference here,
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+ but it should make a significant difference on platforms that try
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+ to run Tor inside a separate thread: they should now be able to
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+ survive Tor's exit conditions rather than having Tor shut down the
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+ entire process. Closes ticket 23848.
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+
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+ o Minor features (embedding, mobile):
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+ - Applications that want to embed Tor can now tell Tor not to
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+ register any of its own POSIX signal handlers, using the
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+ __DisableSignalHandlers option. This option is not meant for
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+ general use. Closes ticket 24588.
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+
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+ o Minor features (fallback directory mirrors):
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+ - Add a nickname to each fallback in a C comment. This makes it
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+ easier for operators to find their relays, and allows stem to use
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+ nicknames to identify fallbacks. Implements ticket 24600.
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+ - Add a type and version header to the fallback directory mirror
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+ file. Also add a delimiter to the end of each fallback entry. This
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+ helps external parsers like stem and Relay Search. Implements
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+ ticket 24725.
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+ - Add an extrainfo cache flag for each fallback in a C comment. This
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+ allows stem to use fallbacks to fetch extra-info documents, rather
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+ than using authorities. Implements ticket 22759.
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+ - Add the generateFallbackDirLine.py script for automatically
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+ generating fallback directory mirror lines from relay fingerprints.
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+ No more typos! Add the lookupFallbackDirContact.py script for
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+ automatically looking up operator contact info from relay
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+ fingerprints. Implements ticket 24706, patch by teor and atagar.
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+ - Reject any fallback directory mirror that serves an expired
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+ consensus. Implements ticket 20942, patch by "minik".
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+ - Remove commas and equals signs from external string inputs to the
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+ fallback list. This avoids format confusion attacks. Implements
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+ ticket 24726.
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+ - Remove the "weight=10" line from fallback directory mirror
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+ entries. Ticket 24681 will maintain the current fallback weights
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+ by changing Tor's default fallback weight to 10. Implements
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+ ticket 24679.
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+
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+ o Minor features (fallbacks):
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+ - Avoid selecting fallbacks that change their IP addresses too
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+ often. Select more fallbacks by ignoring the Guard flag, and
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+ allowing lower cutoffs for the Running and V2Dir flags. Also allow
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+ a lower bandwidth, and a higher number of fallbacks per operator
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+ (5% of the list). Implements ticket 24785.
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+ - Update the fallback whitelist and blacklist based on opt-ins and
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+ relay changes. Closes tickets 22321, 24678, 22527, 24135,
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+ and 24695.
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+
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+ o Minor features (forward-compatibility):
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+ - If a relay supports some link authentication protocol that we do
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+ not recognize, then include that relay's ed25519 key when telling
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+ other relays to extend to it. Previously, we treated future
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+ versions as if they were too old to support ed25519 link
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+ authentication. Closes ticket 20895.
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+
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+ o Minor features (heartbeat):
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+ - Add onion service information to our heartbeat logs, displaying
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+ stats about the activity of configured onion services. Closes
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+ ticket 24896.
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+
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+ o Minor features (instrumentation):
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+ - Add the MainloopStats option to Tor that allows developers to get
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+ instrumentation information from the main event loop via the
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+ heartbeat messages. Closes ticket 24605.
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+
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+ o Minor features (logging):
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+ - Improve a warning message that happens when we fail to re-parse an
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+ old router because of an expired certificate. Closes ticket 20020.
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+ - Make the log more quantitative when we hit MaxMemInQueues
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+ threshold exposing some values. Closes ticket 24501.
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+
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+ o Minor features (logging, android):
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+ - Added support for the Android logging subsystem. Closes
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+ ticket 24362.
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+
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+ o Minor features (OSX, iOS, performance):
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+ - Use the mach_approximate_time() function (when available) to
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+ implement coarse monotonic time. Having a coarse time function
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+ should avoid a large number of system calls, and improve
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+ performance slightly, especially under load. Closes ticket 24427.
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+
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+ o Minor features (performance):
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+ - Support predictive circuit building for onion service circuits
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+ with multiple layers of guards. Closes ticket 23101.
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+ - Use stdatomic.h where available, rather than mutexes, to implement
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+ atomic_counter_t. Closes ticket 23953.
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+
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+ o Minor features (performance, 32-bit):
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+ - Improve performance on 32-bit systems by avoiding 64-bit division
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+ to calculate the current timestamp in milliseconds for channel
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+ padding computations. Implements ticket 24613.
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+ - Improve performance on 32-bit systems by avoiding 64-bit division
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+ when timestamping cells and buffer chunks for OOM calculations.
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+ Implements ticket 24374.
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+
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+ o Minor features (performance, windows):
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+ - Improve performance on Windows Vista and Windows 7 by adjusting
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+ TCP send window size according to the recommendation from
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+ SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
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+ from Vort.
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+
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+ o Minor features (testing, debugging):
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+ - For development purposes, Tor now has a mode in which it runs for
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+ a few seconds, then stops, and starts again without exiting the
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+ process. This mode is meant to help us debug various issues with
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+ ticket 23847. To use this feature, compile with
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+ --enable-restart-degbugging, and set the TOR_DEBUG_RESTART
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+ environment variable. This is expected to crash a lot, and is
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+ really meant for developers only. It will likely be removed in a
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+ future release. Implements ticket 24583.
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+
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+ o Minor bugfix (network IPv6 test):
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+ - Tor test now checks if "ping -6 ::1" works when the user runs
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+ "make test-network-all". Fixes bug 24677; bugfix on 0.2.9.3-alpha.
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+ Patch by "ffmancera".
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+
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+ o Minor bugfixes (build):
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+ - Fix output of autoconf checks to display success messages for Rust
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+ dependencies and a suitable rustc compiler version. Fixes bug
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+ 24612; bugfix on 0.3.1.3-alpha.
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+
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+ o Minor bugfixes (build, rust):
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+ - When building with Rust on OSX, link against libresolv, to work
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+ around the issue at https://github.com/rust-lang/rust/issues/46797.
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+ Fixes bug 24652; bugfix on 0.3.1.1-alpha.
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+ - Don't pass the --quiet option to cargo: it seems to suppress some
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+ errors, which is not what we want to do when building. Fixes bug
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+ 24518; bugfix on 0.3.1.7.
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+ - Build correctly when building from outside Tor's source tree with
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+ the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
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+ on 0.3.1.7.
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+
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+ o Minor bugfixes (code correctness):
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+ - Stop invoking undefined behaviour by using tor_free() on an
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+ unaligned pointer in get_interface_addresses_ioctl(). This pointer
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+ alignment issue exists on x86_64 macOS, but is unlikely to exist
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+ elsewhere. Fixes bug 24733; bugfix on 0.3.0.0-alpha-dev; not in
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+ any released version of tor.
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+
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+ o Minor bugfixes (debugging, memory leaks):
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+ - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
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+ on 0.2.1.1-alpha.
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+
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+ o Minor bugfixes (directory authorities, IPv6):
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+ - When creating a routerstatus (vote) from a routerinfo (descriptor),
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+ set the IPv6 address to the unspecified IPv6 address, and
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+ explicitly initialise the port to zero. Fixes bug 24488; bugfix
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+ on 0.2.4.1-alpha.
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+
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+ o Minor bugfixes (fallback directory mirrors):
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+ - Make updateFallbackDirs.py search harder for python. (Some OSs
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+ don't put it in /usr/bin.) Fixes bug 24708; bugfix
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+ on 0.2.8.1-alpha.
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+
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+ o Minor bugfixes (hibernation):
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+ - When hibernating, close connections normally and allow them to
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+ flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
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+ bug 7267.
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+
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+ o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
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+ - Do not attempt to launch self-reachability tests when entering
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+ hibernation. Fixes a base of bug 12062; bugfix on 0.0.9pre5.
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+ - Resolve several bugs related to descriptor fetching on bridge
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+ clients with bandwidth accounting enabled. (This combination is
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+ not recommended!) Fixes a case of bug 12062; bugfix
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+ on 0.2.0.3-alpha.
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+ - When hibernating, do not attempt to launch DNS checks. Fixes a
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+ case of bug 12062; bugfix on 0.1.2.2-alpha.
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+ - When hibernating, do not try to upload or download descriptors.
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+ Fixes a case of bug 12062; bugfix on 0.0.9pre5.
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+
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+ o Minor bugfixes (IPv6 preferences on bridges):
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+ - Tor now always sets IPv6 preferences for bridges, even if there is
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+ only router information or router status and warns about them.
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+ Fixes bug 24573; bugfix on 0.2.8.2-alpha.
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+ - Tor now sets IPv6 address in rs as well as it's set the one in ri.
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+ Closes ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
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+
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+ o Minor bugfixes (linux seccomp2 sandbox):
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+ - When running with the sandbox enabled, reload configuration files
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+ correctly even when %include was used. Previously we would crash.
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+ Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
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+
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+ o Minor bugfixes (memory cleanup):
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+ - Avoid possible at-exit memory leaks related to use of Libevent's
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+ event_base_once() function. (This function tends to leak memory if
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+ the event_base is closed before the event fires.) Fixes bug 24584;
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+ bugfix on 0.2.8.1-alpha.
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+
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+ o Minor bugfixes (OSX):
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+ - Don't exit the Tor process if setrlimit() fails to change the file
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+ limit (which can happen sometimes on some versions of OSX). Fixes
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+ bug 21074; bugfix on 0.0.9pre5.
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+
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+ o Minor bugfixes (performance):
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+ - Consider circuits for timeout as soon as they complete a hop. This
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+ is more accurate than applying the timeout in
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+ circuit_expire_building() because that function is only called
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+ once per second, which is now too slow for typical timeouts on the
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+ current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
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+ - Use onion service circuits (and other circuits longer than 3 hops)
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+ to calculate a circuit build timeout. Previously, Tor only
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+ calculated its build timeout based on circuits that planned to be
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+ exactly 3 hops long. With this change, we include measurements
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+ from all circuits at the point where they complete their third
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+ hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
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+
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+ o Minor bugfixes (performance, fragile-hardening):
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+ - Improve the performance of our consensus-diff application code
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+ when Tor is built with the --enable-fragile-hardening option set.
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+ Fixes bug 24826; bugfix on 0.3.1.1-alpha.
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+
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+ o Minor bugfixes (testing):
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+ - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
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+ bugfix on 0.2.3.1-alpha.
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+ - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
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+ 25005; bugfix on 0.3.2.7-rc.
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+
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+ o Code simplification and refactoring:
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+ - Remove /usr/athena from search path in configure.ac. Closes
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+ ticket 24363.
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+ - Remove duplicate code in node_has_curve25519_onion_key() and
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+ node_get_curve25519_onion_key(), and add a check for a zero
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+ microdesc curve25519 onion key. Closes ticket 23966, patch by
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+ "aruna1234" and "teor".
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+ - Rewrite channel_rsa_id_group_set_badness to reduce temporary
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+ memory allocations with large numbers of OR connections (e.g.
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+ relays). Closes ticket 24119.
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+ - Separate the function that deletes ephemeral files when Tor
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+ stops gracefully.
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+ - Small changes to Tor's buf_t API to make it suitable for use as a
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+ general-purpose safe string constructor. Closes ticket 22342.
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+ - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
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+ avoid source code identifier confusion. Closes ticket 24467.
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+ - The tor_git_revision[] constant no longer needs to be redeclared
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+ by everything that links against the rest of Tor. Done as part of
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+ ticket 23845, to simplify our external API.
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+ - We make extend_info_from_node() use node_get_curve25519_onion_key()
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+ introduced in ticket 23577 to access the curve25519 public keys
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+ rather than accessing it directly. Closes ticket 23760. Patch by
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+ Neel Chauhan.
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+ - Add a function to log channels' scheduler state changes to aide
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+ debugging efforts. Closes ticket 24531.
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+
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+ o Documentation:
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+ - Add documentation on how to build tor with Rust dependencies
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+ without requiring being online. Closes ticket 22907; bugfix
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+ on 0.3.0.3-alpha.
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+ - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
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+ traffic. Closes ticket 24318.
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+ - Document that OutboundBindAddress doesn't apply to DNS requests.
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+ Closes ticket 22145. Patch from Aruna Maurya.
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+ - Document that operators who run more than one relay or bridge are
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+ expected to set MyFamily and ContactInfo correctly. Closes
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+ ticket 24526.
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+
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+ o Code simplification and refactoring (circuit rendezvous):
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+ - Split get rendezvous circuit on client side on two different
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+ functions. One that returns only established circuits and another
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+ that returns all kinds of circuits. Closes ticket 23459.
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+
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+ o Code simplification and refactoring (controller):
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+ - Make most of the variables in networkstatus_getinfo_by_purpose()
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+ const. Implements ticket 24489.
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+
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+ o Code simplification and refactoring (fallbacks):
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+ - Stop logging excessive information about fallback netblocks.
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+ Implements ticket 24791.
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+
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+
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Changes in version 0.3.2.9 - 2018-01-09
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Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
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Nick Mathewson