Hello, everyone!

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Along with 0.4.2.5, which also comes out today, we're releasing updates to several of our old series, including the LTS (long-term support) series 0.3.5.x.

The new releases are 0.4.1.7, 0.4.0.6, and 0.3.5.9 . Source code is available at https://dist.torproject.org/ .

Note that 0.2.9.x will no longer be supported as of January 1, 2020, and 0.4.0.x will no longer be supported after February 1, 2020. If you are running one of those versions, you should make a plan to upgrade. For more information on our supported release calendar, see https://trac.torproject.org/projects/tor/wiki/org/teams/NetworkTeam/CoreTorR... .

Changes in version 0.4.1.7 - 2019-12-09 This release backports several bugfixes to improve stability and correctness. Anyone experiencing build problems or crashes with 0.4.1.6, including all relays relying on AccountingMax, should upgrade.

o Major features (directory authorities, backport from 0.4.2.2-alpha): - Directory authorities now reject relays running all currently deprecated release series. The currently supported release series are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.

o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha): - Avoid a possible crash when restarting Tor in embedded mode and enabling a different set of publish/subscribe messages. Fixes bug 31898; bugfix on 0.4.1.1-alpha.

o Major bugfixes (relay, backport from 0.4.2.3-alpha): - Relays now respect their AccountingMax bandwidth again. When relays entered "soft" hibernation (which typically starts when we've hit 90% of our AccountingMax), we had stopped checking whether we should enter hard hibernation. Soft hibernation refuses new connections and new circuits, but the existing circuits can continue, meaning that relays could have exceeded their configured AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.

o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): - Stop ignoring torrc options after an %include directive, when the included directory ends with a file that does not contain any config options (but does contain comments or whitespace). Fixes bug 31408; bugfix on 0.3.1.1-alpha.

o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): - Onion services now always use the exact number of intro points configured with the HiddenServiceNumIntroductionPoints option (or fewer if nodes are excluded). Before, a service could sometimes pick more intro points than configured. Fixes bug 31548; bugfix on 0.3.2.1-alpha.

o Minor features (continuous integration, backport from 0.4.2.2-alpha): - When building on Appveyor and Travis, pass the "-k" flag to make, so that we are informed of all compilation failures, not just the first one or two. Closes ticket 31372.

o Minor features (geoip, backport from 0.4.2.5): - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 Country database. Closes ticket 32685.

o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha): - Avoid spurious errors when Appveyor CI fails before the install step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.

o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): - Fix a BUG() assertion that occurs within a very small race window between when a client intro circuit opens and when its descriptor gets cleaned up from the cache. The circuit is now closed early, which will trigger a re-fetch of the descriptor and continue the connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.

o Minor bugfixes (connections, backport from 0.4.2.3-rc): - Avoid trying to read data from closed connections, which can cause needless loops in Libevent and infinite loops in Shadow. Fixes bug 30344; bugfix on 0.1.1.1-alpha.

o Minor bugfixes (error handling, backport from 0.4.2.1-alpha): - On abort, try harder to flush the output buffers of log messages. On some platforms (macOS), log messages could be discarded when the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. - Report the tor version whenever an assertion fails. Previously, we only reported the Tor version on some crashes, and some non-fatal assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha. - When tor aborts due to an error, close log file descriptors before aborting. Closing the logs makes some OSes flush log file buffers, rather than deleting buffered log lines. Fixes bug 31594; bugfix on 0.2.5.2-alpha.

o Minor bugfixes (logging, backport from 0.4.2.2-alpha): - Add a missing check for HAVE_PTHREAD_H, because the backtrace code uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha. - Disable backtrace signal handlers when shutting down tor. Fixes bug 31614; bugfix on 0.2.5.2-alpha. - Rate-limit our the logging message about the obsolete .exit notation. Previously, there was no limit on this warning, which could potentially be triggered many times by a hostile website. Fixes bug 31466; bugfix on 0.2.2.1-alpha.

o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): - Do not log a nonfatal assertion failure when receiving a VERSIONS cell on a connection using the obsolete v1 link protocol. Log a protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): - Reset the periodic events' "enabled" flag when Tor is shut down cleanly. Previously, this flag was left on, which caused periodic events not to be re-enabled when Tor was relaunched in-process with tor_api.h after a shutdown. Fixes bug 32058; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha): - Avoid some undefined behaviour when freeing mutexes. Fixes bug 31736; bugfix on 0.0.7.

o Minor bugfixes (process management, backport from 0.4.2.3-alpha): - Remove overly strict assertions that triggered when a pluggable transport failed to launch. Fixes bug 31091; bugfix on 0.4.0.1-alpha. - Remove an assertion in the Unix process backend. This assertion would trigger when we failed to find the executable for a child process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.

o Minor bugfixes (relay, backport from 0.4.2.2-alpha): - Avoid crashing when starting with a corrupt keys directory where the old ntor key and the new ntor key are identical. Fixes bug 30916; bugfix on 0.2.4.8-alpha.

o Minor bugfixes (testing, backport from 0.4.2.3-alpha): - When testing port rebinding, don't busy-wait for tor to log. Instead, actually sleep for a short time before polling again. Also improve the formatting of control commands and log messages. Fixes bug 31837; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha): - Avoid a map_anon_nofork test failure due to a signed/unsigned integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.

o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): - Log bugs about the TLS read buffer's length only once, rather than filling the logs with similar warnings. Fixes bug 31939; bugfix on 0.3.0.4-rc.

o Documentation (backport from 0.4.2.2-alpha): - Explain why we can't destroy the backtrace buffer mutex. Explain why we don't need to destroy the log mutex. Closes ticket 31736.

o Testing (continuous integration, backport from 0.4.2.3-alpha): - Disable all but one Travis CI macOS build, to mitigate slow scheduling of Travis macOS jobs. Closes ticket 32177. - Run the chutney IPv6 networks as part of Travis CI. Closes ticket 30860. - Simplify the Travis CI build matrix, and optimise for build time. Closes ticket 31859. - Use Windows Server 2019 instead of Windows Server 2016 in our Appveyor builds. Closes ticket 32086.

o Testing (continuous integration, backport from 0.4.2.4-rc): - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241. - Use Ubuntu Bionic images for our Travis CI builds, so we can get a recent version of coccinelle. But leave chutney on Ubuntu Trusty, until we can fix some Bionic permissions issues (see ticket 32240). Related to ticket 31919. - Install the mingw OpenSSL package in Appveyor. This makes sure that the OpenSSL headers and libraries match in Tor's Appveyor builds. (This bug was triggered by an Appveyor image update.) Fixes bug 32449; bugfix on 0.3.5.6-rc.

o Testing (continuous integration, backport from 0.4.2.5): - Require C99 standards-conforming code in Travis CI, but allow GNU gcc extensions. Also activates clang's -Wtypedef-redefinition warnings. Build some jobs with -std=gnu99, and some jobs without. Closes ticket 32500.

Changes in version 0.4.0.6 - 2019-12-09 This is the second stable release in the 0.4.0.x series. This release backports several bugfixes to improve stability and correctness. Anyone experiencing build problems or crashes with 0.4.0.5, including all relays relying on AccountingMax, should upgrade.

Note that, per our support policy, support for the 0.4.0.x series will end on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the latest stable release, or downgrade to 0.3.5.x, which will get long-term support until 1 Feb 2022.

o Directory authority changes (backport from 0.4.1.5): - The directory authority "dizum" has a new IP address. Closes ticket 31406.

o Major bugfixes (bridges, backport from 0.4.1.2-alpha): - Consider our directory information to have changed when our list of bridges changes. Previously, Tor would not re-compute the status of its directory information when bridges changed, and therefore would not realize that it was no longer able to build circuits. Fixes part of bug 29875. - Do not count previously configured working bridges towards our total of working bridges. Previously, when Tor's list of bridges changed, it would think that the old bridges were still usable, and delay fetching router descriptors for the new ones. Fixes part of bug 29875; bugfix on 0.3.0.1-alpha.

o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc): - When considering upgrading circuits from "waiting for guard" to "open", always ignore circuits that are marked for close. Otherwise, we can end up in the situation where a subsystem is notified that a closing circuit has just opened, leading to undesirable behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.

o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha): - Properly clean up the introduction point map when circuits change purpose from onion service circuits to pathbias, measurement, or other circuit types. This should fix some service-side instances of introduction point failure. Fixes bug 29034; bugfix on 0.3.2.1-alpha.

o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha): - Fix an unreachable bug in which an introduction point could try to send an INTRODUCE_ACK with a status code that Trunnel would refuse to encode, leading the relay to assert(). We've consolidated the ABI values into Trunnel now. Fixes bug 30454; bugfix on 0.3.0.1-alpha. - Clients can now handle unknown status codes from INTRODUCE_ACK cells. (The NACK behavior will stay the same.) This will allow us to extend status codes in the future without breaking the normal client behavior. Fixes another part of bug 30454; bugfix on 0.3.0.1-alpha.

o Major bugfixes (relay, backport from 0.4.2.3-alpha): - Relays now respect their AccountingMax bandwidth again. When relays entered "soft" hibernation (which typically starts when we've hit 90% of our AccountingMax), we had stopped checking whether we should enter hard hibernation. Soft hibernation refuses new connections and new circuits, but the existing circuits can continue, meaning that relays could have exceeded their configured AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.

o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): - Stop ignoring torrc options after an %include directive, when the included directory ends with a file that does not contain any config options (but does contain comments or whitespace). Fixes bug 31408; bugfix on 0.3.1.1-alpha.

o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): - Onion services now always use the exact number of intro points configured with the HiddenServiceNumIntroductionPoints option (or fewer if nodes are excluded). Before, a service could sometimes pick more intro points than configured. Fixes bug 31548; bugfix on 0.3.2.1-alpha.

o Minor features (compile-time modules, backport from version 0.4.1.1-alpha): - Add a "--list-modules" command to print a list of which compile- time modules are enabled. Closes ticket 30452.

o Minor features (continuous integration, backport from 0.4.1.1-alpha): - Remove sudo configuration lines from .travis.yml as they are no longer needed with current Travis build environment. Resolves issue 30213.

o Minor features (continuous integration, backport from 0.4.1.4-rc): - Our Travis configuration now uses Chutney to run some network integration tests automatically. Closes ticket 29280.

o Minor features (continuous integration, backport from 0.4.2.2-alpha): - When building on Appveyor and Travis, pass the "-k" flag to make, so that we are informed of all compilation failures, not just the first one or two. Closes ticket 31372.

o Minor features (fallback directory list, backport from 0.4.1.4-rc): - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc in December 2018 (of which ~122 were still functional), with a list of 148 fallbacks (70 new, 78 existing, 79 removed) generated in June 2019. Closes ticket 28795.

o Minor features (geoip, backport from 0.4.2.5): - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 Country database. Closes ticket 32685.

o Minor features (stem tests, backport from 0.4.2.1-alpha): - Change "make test-stem" so it only runs the stem tests that use tor. This change makes test-stem faster and more reliable. Closes ticket 31554.

o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha): - Avoid spurious errors when Appveyor CI fails before the install step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.

o Minor bugfixes (build system, backport form 0.4.2.1-alpha): - Do not include the deprecated <sys/sysctl.h> on Linux or Windows systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.

o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha): - Fix a logic error that prevented the SessionGroup sub-option from being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.

o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc): - On relays, properly check that a padding machine is absent before logging a warning about it being absent. Fixes bug 30649; bugfix on 0.4.0.1-alpha.

o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): - Fix a BUG() assertion that occurs within a very small race window between when a client intro circuit opens and when its descriptor gets cleaned up from the cache. The circuit is now closed early, which will trigger a re-fetch of the descriptor and continue the connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.

o Minor bugfixes (clock skew detection, backport from 0.4.1.5): - Don't believe clock skew results from NETINFO cells that appear to arrive before we sent the VERSIONS cells they are responding to. Previously, we would accept them up to 3 minutes "in the past". Fixes bug 31343; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (compilation warning, backport from 0.4.1.5): - Fix a compilation warning on Windows about casting a function pointer for GetTickCount64(). Fixes bug 31374; bugfix on 0.2.9.1-alpha.

o Minor bugfixes (compilation, backport from 0.4.1.5): - Avoid using labs() on time_t, which can cause compilation warnings on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (compilation, backport from 0.4.2.1-alpha): - Suppress spurious float-conversion warnings from GCC when calling floating-point classifier functions on FreeBSD. Fixes part of bug 31687; bugfix on 0.3.1.5-alpha.

o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha): - Avoid failures when building with the ALL_BUGS_ARE_FATAL option due to missing declarations of abort(), and prevent other such failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.

o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha): - Fix a bug that prevented us from supporting SOCKS5 proxies that want authentication along with configured (but unused!) ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.

o Minor bugfixes (connections, backport from 0.4.2.3-rc): - Avoid trying to read data from closed connections, which can cause needless loops in Libevent and infinite loops in Shadow. Fixes bug 30344; bugfix on 0.1.1.1-alpha.

o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha): - Allow the test-stem job to fail in Travis, because it sometimes hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha. - Skip test_rebind on macOS in Travis, because it is unreliable on macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha. - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc): - Avoid a set of possible code paths that could try to use freed memory in routerlist_free() while Tor was exiting. Fixes bug 31003; bugfix on 0.1.2.2-alpha.

o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha): - Stop crashing after parsing an unknown descriptor purpose annotation. We think this bug can only be triggered by modifying a local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.

o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha): - Move the "bandwidth-file-headers" line in directory authority votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (error handling, backport from 0.4.2.1-alpha): - On abort, try harder to flush the output buffers of log messages. On some platforms (macOS), log messages could be discarded when the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. - Report the tor version whenever an assertion fails. Previously, we only reported the Tor version on some crashes, and some non-fatal assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha): - When extracting an IPv6 address from a PF-based proxy, verify that we are actually configured to receive an IPv6 address, and log an internal error if not. Fixes part of bug 31687; bugfix on 0.2.3.4-alpha.

o Minor bugfixes (guards, backport from 0.4.2.1-alpha): - When tor is missing descriptors for some primary entry guards, make the log message less alarming. It's normal for descriptors to expire, as long as tor fetches new ones soon after. Fixes bug 31657; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (logging, backport from 0.4.1.1-alpha): - Do not log a warning when running with an OpenSSL version other than the one Tor was compiled with, if the two versions should be compatible. Previously, we would warn whenever the version was different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.

o Minor bugfixes (logging, backport from 0.4.2.1-alpha): - Change log level of message "Hash of session info was not as expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix on 0.1.1.10-alpha.

o Minor bugfixes (logging, backport from 0.4.2.2-alpha): - Rate-limit our the logging message about the obsolete .exit notation. Previously, there was no limit on this warning, which could potentially be triggered many times by a hostile website. Fixes bug 31466; bugfix on 0.2.2.1-alpha.

o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): - Do not log a nonfatal assertion failure when receiving a VERSIONS cell on a connection using the obsolete v1 link protocol. Log a protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): - Reset the periodic events' "enabled" flag when Tor is shut down cleanly. Previously, this flag was left on, which caused periodic events not to be re-enabled when Tor was relaunched in-process with tor_api.h after a shutdown. Fixes bug 32058; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha): - Avoid a minor memory leak that could occur on relays when failing to create a "keys" directory. Fixes bug 30148; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (memory leak, backport from 0.4.1.4-rc): - Fix a trivial memory leak when parsing an invalid value from a download schedule in the configuration. Fixes bug 30894; bugfix on 0.3.4.1-alpha.

o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha): - Fix usage of minherit() on NetBSD and other platforms that define MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.

o Minor bugfixes (onion services, backport from 0.4.1.1-alpha): - Avoid a GCC 9.1.1 warning (and possible crash depending on libc implemenation) when failing to load an onion service client authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha): - When purging the DNS cache because of an out-of-memory condition, try purging just the older entries at first. Previously, we would always purge the whole thing. Fixes bug 29617; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (portability, backport from 0.4.1.2-alpha): - Avoid crashing in our tor_vasprintf() implementation on systems that define neither vasprintf() nor _vscprintf(). (This bug has been here long enough that we question whether people are running Tor on such systems, but we're applying the fix out of caution.) Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by Tobias Stoeckmann.

o Minor bugfixes (process management, backport from 0.4.2.3-alpha): - Remove overly strict assertions that triggered when a pluggable transport failed to launch. Fixes bug 31091; bugfix on 0.4.0.1-alpha. - Remove an assertion in the Unix process backend. This assertion would trigger when we failed to find the executable for a child process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.

o Minor bugfixes (relay, backport from 0.4.2.2-alpha): - Avoid crashing when starting with a corrupt keys directory where the old ntor key and the new ntor key are identical. Fixes bug 30916; bugfix on 0.2.4.8-alpha.

o Minor bugfixes (rust, backport from 0.4.2.1-alpha): - Correctly exclude a redundant rust build job in Travis. Fixes bug 31463; bugfix on 0.3.5.4-alpha.

o Minor bugfixes (testing, backport from 0.4.2.3-alpha): - When testing port rebinding, don't busy-wait for tor to log. Instead, actually sleep for a short time before polling again. Also improve the formatting of control commands and log messages. Fixes bug 31837; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): - Log bugs about the TLS read buffer's length only once, rather than filling the logs with similar warnings. Fixes bug 31939; bugfix on 0.3.0.4-rc.

o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha): - Always retry v2 single onion service intro and rend circuits with a 3-hop path. Previously, v2 single onion services used a 3-hop path when rendezvous circuits were retried after a remote or delayed failure, but a 1-hop path for immediate retries. Fixes bug 23818; bugfix on 0.2.9.3-alpha. - Make v3 single onion services fall back to a 3-hop intro, when all intro points are unreachable via a 1-hop path. Previously, v3 single onion services failed when all intro nodes were unreachable via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.

o Documentation (backport from 0.4.2.1-alpha): - Use RFC 2397 data URL scheme to embed an image into tor-exit- notice.html so that operators no longer have to host it themselves. Closes ticket 31089.

o Testing (backport from 0.4.1.2-alpha): - Specify torrc paths (with empty files) when launching tor in integration tests; refrain from reading user and system torrcs. Resolves issue 29702.

o Testing (continuous integration, backport from 0.4.1.1-alpha): - In Travis, show stem's tor log after failure. Closes ticket 30234.

o Testing (continuous integration, backport from 0.4.1.5): - In Travis, make stem log a controller trace to the console, and tail stem's tor log after failure. Closes ticket 30591. - In Travis, only run the stem tests that use a tor binary. Closes ticket 30694.

o Testing (continuous integration, backport from 0.4.2.3-alpha): - Disable all but one Travis CI macOS build, to mitigate slow scheduling of Travis macOS jobs. Closes ticket 32177. - Run the chutney IPv6 networks as part of Travis CI. Closes ticket 30860. - Simplify the Travis CI build matrix, and optimise for build time. Closes ticket 31859. - Use Windows Server 2019 instead of Windows Server 2016 in our Appveyor builds. Closes ticket 32086.

o Testing (continuous integration, backport from 0.4.2.4-rc): - Use Ubuntu Bionic images for our Travis CI builds, so we can get a recent version of coccinelle. But leave chutney on Ubuntu Trusty, until we can fix some Bionic permissions issues (see ticket 32240). Related to ticket 31919. - Install the mingw OpenSSL package in Appveyor. This makes sure that the OpenSSL headers and libraries match in Tor's Appveyor builds. (This bug was triggered by an Appveyor image update.) Fixes bug 32449; bugfix on 0.3.5.6-rc. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.

o Testing (continuous integration, backport from 0.4.2.5): - Require C99 standards-conforming code in Travis CI, but allow GNU gcc extensions. Also activates clang's -Wtypedef-redefinition warnings. Build some jobs with -std=gnu99, and some jobs without. Closes ticket 32500.

Changes in version 0.3.5.9 - 2019-12-09 Tor 0.3.5.9 backports serveral fixes from later releases, including several that affect bridge users, relay stability, onion services, and much more.

o Directory authority changes (backport from 0.4.1.5): - The directory authority "dizum" has a new IP address. Closes ticket 31406.

o Major bugfixes (bridges, backport from 0.4.1.2-alpha): - Consider our directory information to have changed when our list of bridges changes. Previously, Tor would not re-compute the status of its directory information when bridges changed, and therefore would not realize that it was no longer able to build circuits. Fixes part of bug 29875. - Do not count previously configured working bridges towards our total of working bridges. Previously, when Tor's list of bridges changed, it would think that the old bridges were still usable, and delay fetching router descriptors for the new ones. Fixes part of bug 29875; bugfix on 0.3.0.1-alpha.

o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc): - When considering upgrading circuits from "waiting for guard" to "open", always ignore circuits that are marked for close. Otherwise, we can end up in the situation where a subsystem is notified that a closing circuit has just opened, leading to undesirable behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.

o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc): - When running with NSS, disable TLS 1.2 ciphersuites that use SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for these ciphersuites don't work -- which caused relays to fail to handshake with one another when these ciphersuites were enabled. Fixes bug 29241; bugfix on 0.3.5.1-alpha.

o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha): - Properly clean up the introduction point map when circuits change purpose from onion service circuits to pathbias, measurement, or other circuit types. This should fix some service-side instances of introduction point failure. Fixes bug 29034; bugfix on 0.3.2.1-alpha.

o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha): - Fix an unreachable bug in which an introduction point could try to send an INTRODUCE_ACK with a status code that Trunnel would refuse to encode, leading the relay to assert(). We've consolidated the ABI values into Trunnel now. Fixes bug 30454; bugfix on 0.3.0.1-alpha. - Clients can now handle unknown status codes from INTRODUCE_ACK cells. (The NACK behavior will stay the same.) This will allow us to extend status codes in the future without breaking the normal client behavior. Fixes another part of bug 30454; bugfix on 0.3.0.1-alpha.

o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha): - Stop ignoring torrc options after an %include directive, when the included directory ends with a file that does not contain any config options (but does contain comments or whitespace). Fixes bug 31408; bugfix on 0.3.1.1-alpha.

o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha): - Onion services now always use the exact number of intro points configured with the HiddenServiceNumIntroductionPoints option (or fewer if nodes are excluded). Before, a service could sometimes pick more intro points than configured. Fixes bug 31548; bugfix on 0.3.2.1-alpha.

o Minor features (address selection, backport from 0.4.0.3-alpha): - Treat the subnet 100.64.0.0/10 as public for some purposes; private for others. This subnet is the RFC 6598 (Carrier Grade NAT) IP range, and is deployed by many ISPs as an alternative to RFC 1918 that does not break existing internal networks. Tor now blocks SOCKS and control ports on these addresses and warns users if client ports or ExtORPorts are listening on a RFC 6598 address. Closes ticket 28525. Patch by Neel Chauhan.

o Minor features (bandwidth authority, backport from 0.4.0.4-rc): - Make bandwidth authorities ignore relays that are reported in the bandwidth file with the flag "vote=0". This change allows us to report unmeasured relays for diagnostic reasons without including their bandwidth in the bandwidth authorities' vote. Closes ticket 29806.

o Minor features (compile-time modules, backport from version 0.4.1.1-alpha): - Add a "--list-modules" command to print a list of which compile- time modules are enabled. Closes ticket 30452.

o Minor features (continuous integration, backport from 0.4.0.4-rc): - On Travis Rust builds, cleanup Rust registry and refrain from caching the "target/" directory to speed up builds. Resolves issue 29962.

o Minor features (continuous integration, backport from 0.4.0.5): - In Travis, tell timelimit to use stem's backtrace signals, and launch python directly from timelimit, so python receives the signals from timelimit, rather than make. Closes ticket 30117.

o Minor features (continuous integration, backport from 0.4.1.1-alpha): - Remove sudo configuration lines from .travis.yml as they are no longer needed with current Travis build environment. Resolves issue 30213.

o Minor features (continuous integration, backport from 0.4.1.4-rc): - Our Travis configuration now uses Chutney to run some network integration tests automatically. Closes ticket 29280.

o Minor features (continuous integration, backport from 0.4.2.2-alpha): - When building on Appveyor and Travis, pass the "-k" flag to make, so that we are informed of all compilation failures, not just the first one or two. Closes ticket 31372.

o Minor features (fallback directory list, backport from 0.4.1.4-rc): - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc in December 2018 (of which ~122 were still functional), with a list of 148 fallbacks (70 new, 78 existing, 79 removed) generated in June 2019. Closes ticket 28795.

o Minor features (geoip, backport from 0.4.2.5): - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2 Country database. Closes ticket 32685.

o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc): - Try to log an error from NSS (if there is any) and a more useful description of our situation if we are using NSS and a call to SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.

o Minor features (stem tests, backport from 0.4.2.1-alpha): - Change "make test-stem" so it only runs the stem tests that use tor. This change makes test-stem faster and more reliable. Closes ticket 31554.

o Minor bugfixes (security, backport from 0.4.0.4-rc): - Verify in more places that we are not about to create a buffer with more than INT_MAX bytes, to avoid possible OOB access in the event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and fixed by Tobias Stoeckmann. - Fix a potential double free bug when reading huge bandwidth files. The issue is not exploitable in the current Tor network because the vulnerable code is only reached when directory authorities read bandwidth files, but bandwidth files come from a trusted source (usually the authorities themselves). Furthermore, the issue is only exploitable in rare (non-POSIX) 32-bit architectures, which are not used by any of the current authorities. Fixes bug 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by Tobias Stoeckmann.

o Minor bugfix (continuous integration, backport from 0.4.0.4-rc): - Reset coverage state on disk after Travis CI has finished. This should prevent future coverage merge errors from causing the test suite for the "process" subsystem to fail. The process subsystem was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix on 0.2.9.15. - Terminate test-stem if it takes more than 9.5 minutes to run. (Travis terminates the job after 10 minutes of no output.) Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.

o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha): - Avoid spurious errors when Appveyor CI fails before the install step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.

o Minor bugfixes (build system, backport form 0.4.2.1-alpha): - Do not include the deprecated <sys/sysctl.h> on Linux or Windows systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.

o Minor bugfixes (C correctness, backport from 0.4.0.4-rc): - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning CID 1444119.

o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha): - Fix a logic error that prevented the SessionGroup sub-option from being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.

o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc): - Fix a BUG() assertion that occurs within a very small race window between when a client intro circuit opens and when its descriptor gets cleaned up from the cache. The circuit is now closed early, which will trigger a re-fetch of the descriptor and continue the connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.

o Minor bugfixes (clock skew detection, backport from 0.4.1.5): - Don't believe clock skew results from NETINFO cells that appear to arrive before we sent the VERSIONS cells they are responding to. Previously, we would accept them up to 3 minutes "in the past". Fixes bug 31343; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (compilation warning, backport from 0.4.1.5): - Fix a compilation warning on Windows about casting a function pointer for GetTickCount64(). Fixes bug 31374; bugfix on 0.2.9.1-alpha.

o Minor bugfixes (compilation, backport from 0.4.0.2-alpha): - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.

o Minor bugfixes (compilation, backport from 0.4.1.5): - Avoid using labs() on time_t, which can cause compilation warnings on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (compilation, backport from 0.4.2.1-alpha): - Suppress spurious float-conversion warnings from GCC when calling floating-point classifier functions on FreeBSD. Fixes part of bug 31687; bugfix on 0.3.1.5-alpha.

o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha): - Avoid failures when building with the ALL_BUGS_ARE_FATAL option due to missing declarations of abort(), and prevent other such failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.

o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha): - Fix a bug that prevented us from supporting SOCKS5 proxies that want authentication along with configured (but unused!) ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.

o Minor bugfixes (connections, backport from 0.4.2.3-rc): - Avoid trying to read data from closed connections, which can cause needless loops in Libevent and infinite loops in Shadow. Fixes bug 30344; bugfix on 0.1.1.1-alpha.

o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha): - Allow the test-stem job to fail in Travis, because it sometimes hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha. - Skip test_rebind on macOS in Travis, because it is unreliable on macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha. - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc): - Avoid a set of possible code paths that could try to use freed memory in routerlist_free() while Tor was exiting. Fixes bug 31003; bugfix on 0.1.2.2-alpha.

o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha): - Stop crashing after parsing an unknown descriptor purpose annotation. We think this bug can only be triggered by modifying a local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.

o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha): - Move the "bandwidth-file-headers" line in directory authority votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (error handling, backport from 0.4.2.1-alpha): - On abort, try harder to flush the output buffers of log messages. On some platforms (macOS), log messages could be discarded when the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha. - Report the tor version whenever an assertion fails. Previously, we only reported the Tor version on some crashes, and some non-fatal assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha): - When extracting an IPv6 address from a PF-based proxy, verify that we are actually configured to receive an IPv6 address, and log an internal error if not. Fixes part of bug 31687; bugfix on 0.2.3.4-alpha.

o Minor bugfixes (guards, backport from 0.4.2.1-alpha): - When tor is missing descriptors for some primary entry guards, make the log message less alarming. It's normal for descriptors to expire, as long as tor fetches new ones soon after. Fixes bug 31657; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (logging, backport from 0.4.0.2-alpha): - Avoid logging that we are relaxing a circuit timeout when that timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.

o Minor bugfixes (logging, backport from 0.4.0.3-alpha): - Correct a misleading error message when IPv4Only or IPv6Only is used but the resolved address can not be interpreted as an address of the specified IP version. Fixes bug 13221; bugfix on 0.2.3.9-alpha. Patch from Kris Katterjohn. - Log the correct port number for listening sockets when "auto" is used to let Tor pick the port number. Previously, port 0 was logged instead of the actual port number. Fixes bug 29144; bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn. - Stop logging a BUG() warning when Tor is waiting for exit descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (logging, backport from 0.4.1.1-alpha): - Do not log a warning when running with an OpenSSL version other than the one Tor was compiled with, if the two versions should be compatible. Previously, we would warn whenever the version was different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.

o Minor bugfixes (logging, backport from 0.4.2.1-alpha): - Change log level of message "Hash of session info was not as expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix on 0.1.1.10-alpha.

o Minor bugfixes (logging, backport from 0.4.2.2-alpha): - Rate-limit our the logging message about the obsolete .exit notation. Previously, there was no limit on this warning, which could potentially be triggered many times by a hostile website. Fixes bug 31466; bugfix on 0.2.2.1-alpha.

o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha): - Do not log a nonfatal assertion failure when receiving a VERSIONS cell on a connection using the obsolete v1 link protocol. Log a protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.

o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha): - Reset the periodic events' "enabled" flag when Tor is shut down cleanly. Previously, this flag was left on, which caused periodic events not to be re-enabled when Tor was relaunched in-process with tor_api.h after a shutdown. Fixes bug 32058; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha): - Avoid a minor memory leak that could occur on relays when failing to create a "keys" directory. Fixes bug 30148; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (memory leak, backport from 0.4.1.4-rc): - Fix a trivial memory leak when parsing an invalid value from a download schedule in the configuration. Fixes bug 30894; bugfix on 0.3.4.1-alpha.

o Minor bugfixes (memory management, backport from 0.4.0.3-alpha): - Refactor the shared random state's memory management so that it actually takes ownership of the shared random value pointers. Fixes bug 29706; bugfix on 0.2.9.1-alpha.

o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha): - Stop leaking parts of the shared random state in the shared-random unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.

o Minor bugfixes (onion services, backport from 0.4.1.1-alpha): - Avoid a GCC 9.1.1 warning (and possible crash depending on libc implemenation) when failing to load an onion service client authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha): - When purging the DNS cache because of an out-of-memory condition, try purging just the older entries at first. Previously, we would always purge the whole thing. Fixes bug 29617; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (portability, backport from 0.4.1.2-alpha): - Avoid crashing in our tor_vasprintf() implementation on systems that define neither vasprintf() nor _vscprintf(). (This bug has been here long enough that we question whether people are running Tor on such systems, but we're applying the fix out of caution.) Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by Tobias Stoeckmann.

o Minor bugfixes (relay, backport from 0.4.2.2-alpha): - Avoid crashing when starting with a corrupt keys directory where the old ntor key and the new ntor key are identical. Fixes bug 30916; bugfix on 0.2.4.8-alpha.

o Minor bugfixes (rust, backport from 0.4.0.5): - Abort on panic in all build profiles, instead of potentially unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.

o Minor bugfixes (rust, backport from 0.4.2.1-alpha): - Correctly exclude a redundant rust build job in Travis. Fixes bug 31463; bugfix on 0.3.5.4-alpha.

o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha): - Allow connections to single onion services to remain idle without being disconnected. Previously, relays acting as rendezvous points for single onion services were mistakenly closing idle rendezvous circuits after 60 seconds, thinking that they were unused directory-fetching circuits that had served their purpose. Fixes bug 29665; bugfix on 0.2.1.26.

o Minor bugfixes (stats, backport from 0.4.0.3-alpha): - When ExtraInfoStatistics is 0, stop including PaddingStatistics in relay and bridge extra-info documents. Fixes bug 29017; bugfix on 0.3.1.1-alpha.

o Minor bugfixes (testing, backport from 0.4.0.3-alpha): - Downgrade some LOG_ERR messages in the address/* tests to warnings. The LOG_ERR messages were occurring when we had no configured network. We were failing the unit tests, because we backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug 29530; bugfix on 0.3.5.8. - Fix our gcov wrapper script to look for object files at the correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (testing, backport from 0.4.0.4-rc): - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a recent test-network.sh to use new chutney features in CI. Fixes bug 29703; bugfix on 0.2.9.1-alpha. - Fix a test failure on Windows caused by an unexpected "BUG" warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix on 0.2.9.3-alpha.

o Minor bugfixes (testing, backport from 0.4.2.3-alpha): - When testing port rebinding, don't busy-wait for tor to log. Instead, actually sleep for a short time before polling again. Also improve the formatting of control commands and log messages. Fixes bug 31837; bugfix on 0.3.5.1-alpha.

o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc): - When classifying a client's selection of TLS ciphers, if the client ciphers are not yet available, do not cache the result. Previously, we had cached the unavailability of the cipher list and never looked again, which in turn led us to assume that the client only supported the ancient V1 link protocol. This, in turn, was causing Stem integration tests to stall in some cases. Fixes bug 30021; bugfix on 0.2.4.8-alpha.

o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha): - Log bugs about the TLS read buffer's length only once, rather than filling the logs with similar warnings. Fixes bug 31939; bugfix on 0.3.0.4-rc.

o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha): - Always retry v2 single onion service intro and rend circuits with a 3-hop path. Previously, v2 single onion services used a 3-hop path when rendezvous circuits were retried after a remote or delayed failure, but a 1-hop path for immediate retries. Fixes bug 23818; bugfix on 0.2.9.3-alpha. - Make v3 single onion services fall back to a 3-hop intro, when all intro points are unreachable via a 1-hop path. Previously, v3 single onion services failed when all intro nodes were unreachable via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.

o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha): - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit Windows Server 2012 R2 job. The remaining 2 jobs still provide coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set fast_finish, so failed jobs terminate the build immediately. Fixes bug 29601; bugfix on 0.3.5.4-alpha.

o Documentation (backport from 0.4.2.1-alpha): - Use RFC 2397 data URL scheme to embed an image into tor-exit- notice.html so that operators no longer have to host it themselves. Closes ticket 31089.

o Testing (backport from 0.4.1.2-alpha): - Specify torrc paths (with empty files) when launching tor in integration tests; refrain from reading user and system torrcs. Resolves issue 29702.

o Testing (continuous integration, backport from 0.4.1.1-alpha): - In Travis, show stem's tor log after failure. Closes ticket 30234.

o Testing (continuous integration, backport from 0.4.1.5): - In Travis, make stem log a controller trace to the console, and tail stem's tor log after failure. Closes ticket 30591. - In Travis, only run the stem tests that use a tor binary. Closes ticket 30694.

o Testing (continuous integration, backport from 0.4.2.3-alpha): - Disable all but one Travis CI macOS build, to mitigate slow scheduling of Travis macOS jobs. Closes ticket 32177. - Run the chutney IPv6 networks as part of Travis CI. Closes ticket 30860. - Simplify the Travis CI build matrix, and optimise for build time. Closes ticket 31859. - Use Windows Server 2019 instead of Windows Server 2016 in our Appveyor builds. Closes ticket 32086.

o Testing (continuous integration, backport from 0.4.2.4-rc): - Use Ubuntu Bionic images for our Travis CI builds, so we can get a recent version of coccinelle. But leave chutney on Ubuntu Trusty, until we can fix some Bionic permissions issues (see ticket 32240). Related to ticket 31919. - Install the mingw OpenSSL package in Appveyor. This makes sure that the OpenSSL headers and libraries match in Tor's Appveyor builds. (This bug was triggered by an Appveyor image update.) Fixes bug 32449; bugfix on 0.3.5.6-rc. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.

o Testing (continuous integration, backport from 0.4.2.5): - Require C99 standards-conforming code in Travis CI, but allow GNU gcc extensions. Also activates clang's -Wtypedef-redefinition warnings. Build some jobs with -std=gnu99, and some jobs without. Closes ticket 32500.