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246
ChangeLog
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Changes in version 0.2.7.3-????? - 2015-09-1?
XXXX write a blurb
o Major features (security, hidden services):
- For an hidden service, it is now prohibited to use one single
EntryNodes to avoid a very easy guard discovery attack. For more
details, see the ticket description here:
https://trac.torproject.org/projects/tor/ticket/14917. Fixes
ticket 14917.
o Major features (relay, Ed25519):
- Significant improvements to the usability of relay-side Ed25519
key management. Log messages are better, and the code can recover
from far more failure conditions. Thanks to "s7r" for reporting
and diagnosing so many of these!
o Major bugfixes (relay, Ed25519):
- Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
0.2.7.2-alpha. Reported by "s7r".
- Improve handling of expired signing keys along with offline master
keys. Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported by "s7r".
o Major enhancements (performance testing):
- Add chutney performance testing support to src/test/test-
network.sh The following arguments change how chutney verifies the
network: "--bytes n" sends n bytes per test connection;
"--connections n" makes n test connections per client; and
"--hs-multi-client 1" makes each client connect to each HS.
Requires the corresponding chutney performance testing changes.
Note: using --connections 7 or greater on a HS will trigger issue
15937. Patch by "teor". Closes ticket 14175.
o Minor features:
- Try harder to normalize the exit status of the Tor process to the
standard-provided range. Fixes bug 16975; bugfix on every version
of Tor ever.
- Update geoip and geoip6 to the July 8 2015 Maxmind GeoLite2
Country database.
o Minor features (client-side privacy):
- Indefinitely extend circuit lifespan by resetting dirtyness, if
IsolateSOCKSAuth is in use, the new `KeepAliveIsolateSOCKSAuth`
option is set, and streams with SOCKS authentication are attached
to the circuit. Implements feature 15482.
o Minor features (compilation):
- Give a warning as early as possible when trying to build with an
unsupported OpenSSL version. Closes ticket 16901.
o Minor features (Hidden service directory):
- Relays need to have the Fast flag to get the HSDir flag. As this
is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
drop. Fixes ticket 15963.
o Minor features (hidden Service Statistics):
- Turn on hidden service statistics collection by setting the torrc
option HiddenServiceStatistics to "1" by default. Closes
ticket 15254.
o Minor features (hidden service):
- Client now uses an introduction point failure cache to know when
to fetch or keep a descriptor in their cache.
When fetching a descriptor, for every introduction points in it,
we look them up in the failure cache to know if we keep the
descriptor or not. For this to work, everytime an introduction
points is discarded (ex: receiving a NACK), we note it down in our
introduction cache. If all introduction points for an onion
service are in our failure cache, we discard the descriptor and
fetch a new one.
See rendcache.c for a detailed explanation of the cache's
behavior. Closes ticket 16389.
o Minor features (performance):
- Improve the runtime speed of Ed25519 operations and Curve25519
keypair generation when built targeting 32 bit x86 platforms with
SSE2 available. Implements ticket 16535.
- Improve the runtime speed of Ed25519 signature verification by
using Ed25519-donna's batch verification support when there are a
lot of signatures to verify at once. Implements ticket 16533.
o Minor features (testing):
- Autodetect CHUTNEY_PATH if the chutney and tor sources are side-
by-side in the same parent directory. Closes ticket 16903. Patch
by "teor".
o Minor features (testing, authorities):
- New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags. "A node
will never receive the corresponding flag unless that node is
specified in the TestingDirAuthVote{Exit,Guard,HSDir} list,
regardless of its uptime, bandwidth, exit policy, or DirPort".
Closes ticket 14882. Patch by "robgjansen", modified by "teor" as
VoteOnHidServDirectoriesV2 is now obsolete. Commit message and
changes file by "teor" & "robgjansen".
o Minor features (testing, authorities, documentation):
- Fix an error in the manual page and comments for
TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
required "ORPort connectivity". While this is true, it is in no
way unique to the HSDir flag. Of all the flags, only HSDirs need a
DirPort configured in order for the authorities to assign that
particular flag. Fixed as part of 14882. Patch by "teor". Bugfix
on 0.2.6.3 (f9d57473e1ff on 10 January 2015).
o Minor features (testing, bridges, hidden services):
- Make "bridges+hs" the default test network. This tests almost all
tor functionality during make test-network, while allowing tests
to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
test-network-bridges-hs. Closes tickets 16945 (tor), 16946
(chutney) . Patches by "teor".
o Minor bugfixes:
- Check correctly for windows socket errors in the workqueue
backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
- Ensure that worker threads actually exit when a fatal error or
shutdown is indicated. This doesn't currently affect the behaviour
of Tor, because Tor never indicates fatal error or shutdown except
in its unit tests. Fixes bug 16868; bugfix on 0.2.6.3-alpha.
- Fix an usage message of tor-resolve(1) so that it no longer lists
the removed -F option. Fixes bug 16913; bugfix on
Tor 0.2.2.28-beta.
- Fix the behavior of crypto_time_t when told to consider times
before 1970. (These times were possible when running in a
simulated network environment where time()'s output starts at
zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.
- When calling channel_free_list(), avoid calling smartlist_remove()
while inside a FOREACH loop. This partially reverts commit
17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
- When logging malformed hostnames in socks5 requests, respect
SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
- include the TUNING document in our source tarball. It is referred
to in the ChangeLog and an error message. Fixes bug 16929; bugfix
on 0.2.6.1-alpha.
o Minor bugfix (open file limit):
- Fix set_max_file_descriptors() to set by default the max open file
limit to the current limit in case setrlimit() fails so we at
least have a usable value; Fixes bug 16274; bugfix on tor-
0.2.0.10-alpha. Patch by dgoulet.
o Minor bugfixes (authority):
- Don't assign "HSDir" to a router if it isn't Valid and Running.
Fixes bug 16524; bugfix on 0.2.7.2-alpha.
- Downgrade log messages about Ed25519 key issues, if they are in
old cached router descriptors. Fixes part of bug 16286; bugfix
on 0.2.7.2-alpha.
- When we find an Ed25519 key issue in a cached descriptor, stop
saying the descriptor was just "uploaded". Fixes another part of
bug 16286; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (control port):
- Control port was using set_max_file_descriptors() with a limit set
to 0 to get the max value. A recent fix made this use case return
an error and introduced dead code in that function. This triggered
a warning that our limit (ConnLimit) was invalid but in reality it
was not.
Now, to the control port uses a specific getter function to query
the value and set_max_file_descriptors() should never be used
again for that purpose. Fixes bug 16697; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (Ed25519):
- Fix a memory leak when reading router descriptors with expired
Ed25519 certificate. Fixes bug 16539; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (linux seccomp2 sandbox):
- Allow bridge authorities to run correctly under the seccomp2
sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
- Allow routers with ed25519 keys to run correctly under the
seccomp2 sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (relay):
- Unblock threads before releasing the mutex to ensure predictable
scheduling behavior. Fixes bug 16644; bugfix on 0.2.6.3-alpha.
o Code simplification and refactoring:
- Change the function that's called when we need to retry all
downloads so that it only reschedules the downloads to happen
immediately, rather than launching them all at once itself. This
further simplifies Tor's callgraph.
- Move some format-parsing functions out of crypto.c and
crypto_curve25519.c into crypto_format.c and/or util_format.c.
- Move the client-only parts of init_keys() into a separate
function. Closes ticket 16763.
- Simplify the microdesc_free() implementation so that it no longer
appears (to code analysis tools) to potentially invoke a huge
suite of other microdesc functions.
- Simply the control graph further by deferring the inner body of
directory_all_unreachable() into a callback. Closes ticket 16762.
- Treat the loss of an owning controller as equivalent to a SIGTERM
signal. This removes a tiny amount of duplicated code, and
simplifies our callgraph. Closes ticekt 16788.
- When generating an event to send to the controller, we no longer
put the event over the network immediately. Instead, we queue
these events, and use a Libevent callback to deliver them. This
change simplifies Tor's callgraph by reducing the number of
functions from which all other Tor functions are reachable. Closes
ticket 16695.
- Wrap windows-only C files inside '#ifdef _WIN32' so that tools
that try to scan or compile every file on Unix won't decide that
they are broken.
o Code simplifications and refactoring:
- Remove the unused "nulterminate" argument from buf_pullup().
o Documentation:
- Recommend a 40 GB example AccountingMax in torrc.sample rather
than a 4 GB max. Closes ticket 16742.
o Removed code:
- The internal pure-C tor-fw-helper tool is now removed from the Tor
distribution, in favor of the pure-Go clone available from
https://github.com/Yawning/tor-fw-helper . The libraries used by
the C tor-fw-helper are not, in our opinion, very confidence-
inspiring in their secure-proggramming techniques. Closes
ticket 13338.
o Removed features:
- Remove the code that would try to aggressively flush controller
connections while writing to them. This code was introduced in
0.1.2.7-alpha, in order to keep output buffers from exceeding
their limits. But there is no longer a maximum output buffer size,
and flushing data in this way caused some undesirable recursions
in our call graph. Closes ticket 16480.
o Testing:
- Add a new set of callgraph analysis scripts that use clang to
produce a list of which Tor functions are reachable from which
other Tor functions. We're planning to use these to help simplify
our code structure by identifying illogical dependencies.
- Add new 'test-full' and 'test-full-online' targets to run all
tests, including integration tests with stem and chutney.
- Make the test-workqueue test work on windows by initializing the
network before we begin.
- New make target (make test-network-all) to run multiple applicable
chutney test cases. Patch from Teor; closes 16953.
- Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
functions in dns.c. Implements a portion of ticket 16831.
- When building Tor with testing coverage enabled, run Chutney tests
(if any) using the 'tor-cov' coverage binary.
- When running test-network or test-stem, check for the absence of
stem/chutney before doing any build operations.
Changes in version 0.2.7.2-alpha - 2015-07-27
This, the second alpha in the Tor 0.2.7 series, has a number of new
features, including a way to manually pick the number of introduction

12
changes/16679_16685_etc
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@ -1,12 +0,0 @@
o Major features (relay, Ed25519):
- Significant improvements to the usability of relay-side Ed25519
key management. Log messages are better, and the code can
recover from far more failure conditions. Thanks to "s7r" for
reporting and diagnosing so many of these!
o Major bugfixes (relay, Ed25519):
- Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
0.2.7.2-alpha. Reported by "s7r".
- Improve handling of expired signing keys along with offline
master keys. Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported
by "s7r".

4
changes/autodetect-chutney-path
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@ -1,4 +0,0 @@
o Minor features (testing):
- Autodetect CHUTNEY_PATH if the chutney and tor sources are
side-by-side in the same parent directory.
Closes ticket 16903. Patch by "teor".

6
changes/bug14917
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@ -1,6 +0,0 @@
o Major features (security, hidden services):
- For an hidden service, it is now prohibited to use one single
EntryNodes to avoid a very easy guard discovery attack. For more
details, see the ticket description here:
https://trac.torproject.org/projects/tor/ticket/14917. Fixes ticket 14917.

4
changes/bug15963
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@ -1,4 +0,0 @@
o Minor features (Hidden service directory)
- Relays need to have the Fast flag to get the HSDir flag. As this is
being written, we'll go from 2745 HSDirs down to 2342, a ~14% drop.
Fixes ticket 15963.

5
changes/bug16274
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@ -1,5 +0,0 @@
o Minor bugfix (open file limit):
- Fix set_max_file_descriptors() to set by default the max open file
limit to the current limit in case setrlimit() fails so we at least
have a usable value; Fixes bug 16274; bugfix on tor-0.2.0.10-alpha.
Patch by dgoulet.

8
changes/bug16286
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@ -1,8 +0,0 @@
o Minor bugfixes (authority):
- Downgrade log messages about Ed25519 key issues, if they are in
old cached router descriptors. Fixes part of bug 16286; bugfix on
0.2.7.2-alpha.
- When we find an Ed25519 key issue in a cached descriptor, stop saying
the descriptor was just "uploaded". Fixes another part of bug 16286;
bugfix on 0.2.7.2-alpha.

13
changes/bug16389
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@ -1,13 +0,0 @@
o Minor features (hidden service)
Client now uses an introduction point failure cache to know when to
fetch or keep a descriptor in their cache.
When fetching a descriptor, for every introduction points in it, we look
them up in the failure cache to know if we keep the descriptor or not.
For this to work, everytime an introduction points is discarded (ex:
receiving a NACK), we note it down in our introduction cache. If all
introduction points for an onion service are in our failure cache, we
discard the descriptor and fetch a new one.
See rendcache.c for a detailed explanation of the cache's behavior.
Closes ticket 16389.

3
changes/bug16524
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@ -1,3 +0,0 @@
o Minor bugfixes (authority):
- Don't assign "HSDir" to a router if it isn't Valid and Running.
Fixes bug 16524; bugfix on 0.2.7.2-alpha.

4
changes/bug16539
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@ -1,4 +0,0 @@
o Minor bugfixes (Ed25519):
- Fix a memory leak when reading router descriptors with
expired Ed25519 certificate. Fixes bug 16539; bugfix on 0.2.7.2-alpha.

3
changes/bug16644
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@ -1,3 +0,0 @@
o Minor bugfixes (relay):
- Unblock threads before releasing the mutex to ensure predictable
scheduling behavior. Fixes bug 16644; bugfix on 0.2.6.3-alpha.

10
changes/bug16697
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@ -1,10 +0,0 @@
o Minor bugfixes (control port):
- Control port was using set_max_file_descriptors() with a limit set to
0 to get the max value. A recent fix made this use case return an
error and introduced dead code in that function. This triggered a
warning that our limit (ConnLimit) was invalid but in reality it was
not.
Now, to the control port uses a specific getter function to query the
value and set_max_file_descriptors() should never be used again for
that purpose. Fixes bug 16697; bugfix on 0.2.7.2-alpha.

3
changes/bug16741
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@ -1,3 +0,0 @@
o Minor bugfixes:
- Check correctly for windows socket errors in the workqueue backend.
Fixes bug 16741; bugfix on 0.2.6.3-alpha.

3
changes/bug16742
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o Documentation:
- Recommend a 40 GB example AccountingMax in torrc.sample rather
than a 4 GB max. Closes ticket 16742.

3
changes/bug16901
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o Minor features (compilation):
- Give a warning as early as possible when trying to build with an
unsupported OpenSSL version. Closes ticket 16901.

4
changes/bug16913
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@ -1,4 +0,0 @@
o Minor bugfixes:
- Fix an usage message of tor-resolve(1) so that it no longer lists
the removed -F option. Fixes bug 16913; bugfix on Tor
0.2.2.28-beta.

6
changes/bug16924
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@ -1,6 +0,0 @@
o Minor bugfixes:
- When calling channel_free_list(), avoid calling smartlist_remove()
while inside a FOREACH loop. This partially reverts commit
17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.

5
changes/bug16929
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@ -1,5 +0,0 @@
o Minor bugfixes:
- include the TUNING document in our source tarball. It is referred
to in the ChangeLog and an error message. Fixes bug 16929; bugfix
on 0.2.6.1-alpha.

4
changes/bug16964
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o Minor bugfixes (linux seccomp2 sandbox):
- Allow bridge authorities to run correctly under the seccomp2
sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.

4
changes/bug16965
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@ -1,4 +0,0 @@
o Minor bugfixes (linux seccomp2 sandbox):
- Allow routers with ed25519 keys to run correctly under the seccomp2
sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.

6
changes/bug16980
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@ -1,6 +0,0 @@
o Minor bugfixes:
- Fix the behavior of crypto_time_t when told to consider times
before 1970. (These times were possible when running in a
simulated network environment where time()'s output starts at
zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.

5
changes/callgraph
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@ -1,5 +0,0 @@
o Testing:
- Add a new set of callgraph analysis scripts that use clang to
produce a list of which Tor functions are reachable from which
other Tor functions. We're planning to use these to help simplify
our code structure by identifying illogical dependencies.

3
changes/chutney-coverage
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@ -1,3 +0,0 @@
o Testing:
- When building Tor with testing coverage enabled, run Chutney tests
(if any) using the 'tor-cov' coverage binary.

7
changes/decouple-write-handle_write
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@ -1,7 +0,0 @@
o Removed features:
- Remove the code that would try to aggressively flush controller
connections while writing to them. This code was introduced in
0.1.2.7-alpha, in order to keep output buffers from exceeding their
limits. But there is no longer a maximum output buffer size, and
flushing data in this way caused some undesirable recursions
in our call graph. Closes ticket 16480.

8
changes/decouple_control_events
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@ -1,8 +0,0 @@
o Code simplification and refactoring:
- When generating an event to send to the controller, we no longer
put the event over the network immediately. Instead, we queue
these events, and use a Libevent callback to deliver them.
This change simplifies Tor's callgraph by reducing the number
of functions from which all other Tor functions are reachable.
Closes ticket 16695.

4
changes/decouple_dir_all_unreachable
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@ -1,4 +0,0 @@
o Code simplification and refactoring:
- Simply the control graph further by deferring the inner body of
directory_all_unreachable() into a callback. Closes ticket
16762.

3
changes/decouple_init_keys
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@ -1,3 +0,0 @@
o Code simplification and refactoring:
- Move the client-only parts of init_keys() into a separate function.
Closes ticket 16763.

4
changes/decouple_lost_owner
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@ -1,4 +0,0 @@
o Code simplification and refactoring:
- Treat the loss of an owning controller as equivalent to a SIGTERM
signal. This removes a tiny amount of duplicated code, and simplifies
our callgraph. Closes ticekt 16788.

6
changes/decouple_retry_directory
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@ -1,6 +0,0 @@
o Code simplification and refactoring:
- Change the function that's called when we need to retry all downloads
so that it only reschedules the downloads to happen immediately, rather
than launching them all at once itself. This further simplifies
Tor's callgraph.

3
changes/early-check-paths
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@ -1,3 +0,0 @@
o Testing:
- When running test-network or test-stem, check for the absence
of stem/chutney before doing any build operations.

9
changes/feature14175-chutney-performance
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@ -1,9 +0,0 @@
o Major enhancements (performance testing):
- Add chutney performance testing support to src/test/test-network.sh
The following arguments change how chutney verifies the network:
"--bytes n" sends n bytes per test connection;
"--connections n" makes n test connections per client; and
"--hs-multi-client 1" makes each client connect to each HS.
Requires the corresponding chutney performance testing changes.
Note: using --connections 7 or greater on a HS will trigger issue 15937.
Patch by "teor". Closes ticket 14175.

18
changes/feature14882-TestingDirAuthVoteIsStrict
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@ -1,18 +0,0 @@
o Minor features (testing, authorities):
- New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags.
"A node will never receive the corresponding flag unless
that node is specified in the
TestingDirAuthVote{Exit,Guard,HSDir} list, regardless of
its uptime, bandwidth, exit policy, or DirPort".
Closes ticket 14882. Patch by "robgjansen", modified by
"teor" as VoteOnHidServDirectoriesV2 is now obsolete.
Commit message and changes file by "teor" & "robgjansen".
o Minor features (testing, authorities, documentation):
- Fix an error in the manual page and comments for
TestingDirAuthVoteHSDir[IsStrict], which suggested that a
HSDir required "ORPort connectivity". While this is true,
it is in no way unique to the HSDir flag. Of all the flags,
only HSDirs need a DirPort configured in order for the
authorities to assign that particular flag.
Fixed as part of 14882. Patch by "teor".
Bugfix on 0.2.6.3 (f9d57473e1ff on 10 January 2015).

5
changes/feature15482
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@ -1,5 +0,0 @@
o Minor features (client-side privacy)
- Indefinitely extend circuit lifespan by resetting dirtyness, if
IsolateSOCKSAuth is in use, the new `KeepAliveIsolateSOCKSAuth`
option is set, and streams with SOCKS authentication are attached
to the circuit. Implements feature 15482.

4
changes/feature16533
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@ -1,4 +0,0 @@
o Minor features (performance)
- Improve the runtime speed of Ed25519 signature verification by using
Ed25519-donna's batch verification support when there are a lot of
signatures to verify at once. Implements ticket 16533.

4
changes/feature16535
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@ -1,4 +0,0 @@
o Minor features (performance)
- Improve the runtime speed of Ed25519 operations and Curve25519 keypair
generation when built targeting 32 bit x86 platforms with SSE2
available. Implements ticket 16535.

3
changes/geoip-july2015
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@ -1,3 +0,0 @@
o Minor features:
- Update geoip and geoip6 to the July 8 2015 Maxmind GeoLite2 Country database.

3
changes/malformed-hostname-safe-logging
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@ -1,3 +0,0 @@
o Minor bugfixes:
- When logging malformed hostnames in socks5 requests, respect
SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.

4
changes/microdesc_cycle
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@ -1,4 +0,0 @@
o Code simplification and refactoring:
- Simplify the microdesc_free() implementation so that it no longer
appears (to code analysis tools) to potentially invoke a huge suite
of other microdesc functions.

3
changes/move_formatting_functions
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@ -1,3 +0,0 @@
o Code simplification and refactoring:
- Move some format-parsing functions out of crypto.c and
crypto_curve25519.c into crypto_format.c and/or util_format.c.

4
changes/normalize_exit
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@ -1,4 +0,0 @@
o Minor features:
- Try harder to normalize the exit status of the Tor process to the
standard-provided range. Fixes bug 16975; bugfix on every version
of Tor ever.

2
changes/pullup_nulterm
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@ -1,2 +0,0 @@
o Code simplifications and refactoring:
- Remove the unused "nulterminate" argument from buf_pullup().

3
changes/test-full
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@ -1,3 +0,0 @@
o Testing:
- Add new 'test-full' and 'test-full-online' targets to run all tests,
including integration tests with stem and chutney.

3
changes/test-net-all
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@ -1,3 +0,0 @@
o Testing:
- New make target (make test-network-all) to run multiple applicable
chutney test cases. Patch from Teor; closes 16953.

6
changes/test-network-bridges-hs
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@ -1,6 +0,0 @@
o Minor features (testing, bridges, hidden services):
- Make "bridges+hs" the default test network. This tests almost all
tor functionality during make test-network, while allowing tests
to succeed on non-IPv6 systems.
Requires chutney commit 396da92 in test-network-bridges-hs.
Closes tickets 16945 (tor), 16946 (chutney) . Patches by "teor".

3
changes/test-workqueue-windows
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@ -1,3 +0,0 @@
o Testing:
- Make the test-workqueue test work on windows by initializing the
network before we begin.

6
changes/ticket13338
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@ -1,6 +0,0 @@
o Removed code:
- The internal pure-C tor-fw-helper tool is now removed from the
Tor distribution, in favor of the pure-Go clone available from
https://github.com/Yawning/tor-fw-helper . The libraries used
by the C tor-fw-helper are not, in our opinion, very confidence-
inspiring in their secure-proggramming techniques. Closes ticket 13338.

4
changes/ticket15254-hs-stats-default
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@ -1,4 +0,0 @@
o Hidden Service Statistics
- Turn on hidden service statistics collection by setting the torrc
option HiddenServiceStatistics to "1" by default. Closes ticket
15254.

3
changes/ticket16831_part1
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@ -1,3 +0,0 @@
o Testing:
- Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
functions in dns.c. Implements a portion of ticket 16831.

4
changes/windows_only_files
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o Code simplification and refactoring:
- Wrap windows-only C files inside '#ifdef _WIN32' so that tools that
try to scan or compile every file on Unix won't decide that they
are broken.

6
changes/workqueue_reply_t
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o Minor bugfixes:
- Ensure that worker threads actually exit when a fatal error or
shutdown is indicated. This doesn't currently affect the behaviour
of Tor, because Tor never indicates fatal error or shutdown except
in its unit tests. Fixes bug 16868; bugfix on 0.2.6.3-alpha.