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Start on a changelog for 0.2.6.2-alpha

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ChangeLog
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Changes in version 0.2.6.2-alpha - 2014-1?-??
Changes in version 0.2.6.2-alpha - 2014-12-??
Tor 0.2.6.2-alpha is the second alpha release in the 0.2.6.x series.
o Major features (hidden services):
- Add a HiddenServiceStatistics option that allows Tor relays to
gather and publish statistics about hidden service usage, to
better understand the size and volume of the hidden service
network. Specifically, if a Tor relay is an HSDir it will
publish the approximate number of hidden services that have
published descriptors to it the past 24 hours. Also, if a relay
has acted as a hidden service rendezvous point, it will publish
the approximate amount of rendezvous cells it has relayed the
past 24 hours. The statistics themselves are obfuscated so that
the exact values cannot be derived. For more details see
proposal 238 "Better hidden service stats from Tor relays". This
feature is currently disabled by default. Implements feature 13192.
o Major features (relay, infrastructure):
- Implement a new inter-cmux comparison API, a global high/low watermark
mechanism and a global scheduler loop for transmission prioritization
across all channels as well as among circuits on one channel. This
schedule is currently tuned to (tolerantly) avoid making changes
in the current network performance, but it should form the basis
major circuit performance increases. Code by Andrea; implements
ticket 9262.
o Testing:
- New tests for many parts of channel, relay, and circuit mux
functionality. Code by Andrea; part of 9262.
o Major bugfixes:
- When closing an introduction circuit that was opened in
parallel, don't mark the introduction point as
unreachable. Previously, the first successful connection to an
introduction point would make the other uintroduction points get
marked as having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
o Minor feature:
- When re-enabling the network, don't try to build introduction circuits
until we have successfully built a circuit. This makes hidden services
come up faster when the network is re-enabled. Patch from
"akwizgran". Closes ticket 13447.
o Minor features (controller):
- Add a "SIGNAL HEARTBEAT" Tor controller command that provokes
writing unscheduled heartbeat message to the log. Implements
feature 9503.
o Minor features (hidden services):
- Inform Tor controller about nature of failure to retrieve
hidden service descriptor by sending reason string with HS_DESC
FAILED controller event. Implements feature 13212.
o Minor features (hidden services):
- New HiddenServiceDirGroupReadable option to cause hidden service
directories and hostname files to be created group-readable.
Patch from "anon", David Stainton, and "meejah".
Closes ticket 11291.
o Minor features:
- OS X uses ipfw (FreeBSD) or pf (OpenBSD). Update the transparent
proxy option checks to allow for both ipfw and pf on OS X.
Closes ticket 14002.
o Minor features:
- Update geoip to the November 15 2014 Maxmind GeoLite2 Country database.
o Minor features:
- Update geoip6 to the November 15 2014 Maxmind GeoLite2 Country database.
o Minor features:
- Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
is enabled, reject requests with IP addresses as hostnames. Resolves
ticket 13315.
o Minor bugfixes (hidden services):
- Pre-check directory permissions for new hidden-services to avoid
at least one case of "Bug: Acting on config options left us in a
broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
o Minor bugfixes (hidden services):
- When adding a new hidden-service (for example, via SETCONF) Tor
no longer logs a congratulations for running a relay. Fixes bug
13941; bugfix on 0.2.6.1-alpha.
o Minor bugfixes (hidden services):
- When fetching hidden service descriptors, check not only for
whether we got the hidden service we had in mind, but also
whether we got the particular descriptors we wanted. This
prevents a class of inefficient but annoying DoS attacks by
hidden service directories. Fixes bug 13214; bugfix on
0.2.1.6-alpha. Reported by "special".
o Minor bugfixes (logging):
- Downgrade warnings about RSA signature failures to info log
level. Emit a warning when extra info document is found
incompatible with a corresponding router descriptor. Fixes bug
9812; bugfix on 0.0.6rc3.
o Minor bugfixes (logging):
- Log the circuit identifier correctly in
connection_ap_handshake_attach_circuit(). Fixes bug 13701;
bugfix on 0.0.6.
o Minor bugfixes:
- Silence clang warnings under --enable-expensive-hardening, including:
implicit truncation of 64 bit values to 32 bit;
const char assignment to self;
tautological compare; and
additional parentheses around equality tests.
Fixes bug 13577; bugfix on 0.2.5.4-alpha.
o Minor bugfixes:
- Stop allowing invalid address patterns containing both a wildcard
address and a bit prefix length. This affects all our
address-range parsing code. Fixes bug 7484; bugfix on 0.0.2pre14.
o Minor bugfixes:
- The address of an array in the middle of a structure will
always be non-NULL. clang recognises this and complains.
Disable the tautologous and redundant check to silence
this warning.
Fixes bug 14001; bugfix on 0.2.1.2-alpha.
o Minor bugfixes:
- Use a full 256 bits of the SHA256 digest of a microdescriptor when
computing which microdescriptors to download. This keeps us from
erroneous download behavior if two microdescriptor digests ever have
the same first 160 bits. Fixes part of bug 13399; bugfix on
0.2.3.1-alpha.
- Reset a router's status if its microdescriptor digest changes,
even if the first 160 bits remain the same. Fixes part of bug
13399; bugfix on 0.2.3.1-alpha.
o Minor bugfixes:
- Use circuit_has_opened() instead of rend_client_rendcirc_has_opened()
when a rendezvous circuit is opened because circuit_has_opened() jobs
is to call a specialized function depending on the circuit purpose.
Furthermore, a controller event will be triggered here where the
former did not. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
o Code Simplification and Refactoring:
- Stop using can_complete_circuits as a global variable; access it with
a function instead.
o Code simplification and refactoring:
- Remove our old, non-weighted bandwidth-based node selection code.
Previously, we used it as a fallback when we couldn't perform
weighted bandwidth-based node selection. But that would only
happen in the cases where we had no consensus, or when we had a
consensus generated by buggy or ancient directory authorities. In
either case, it's better to use the more modern, better maintained
algorithm, with reasonable defaults for the weights. Closes
ticket 13126.
o Code simplification and refactoring:
- Avoid using operators directly as macro arguments: this lets us
apply coccinelle transformations to our codebase more
directly. Closes ticket 13172.
o Code simplification and refactoring:
- Combine the functions used to parse ClientTransportPlugin and
ServerTransportPlugin into a single function. Closes ticket 6456.
o Testing:
- New tests for parse_transport_line(). Part of ticket 6456.
o Code simplifications and refactoring:
- Add inline functions and convenience macros for quick lookup of
state component of channel_t structure. Refactor various parts of
codebase to use convenience macros instead of checking state
member of channel_t directly. Fixes issue 7356.
o Code simplifications and refactoring:
- Document all members of was_router_added_t enum and rename
ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
o Code simplifications and refactoring:
- In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
constant instead of hardcoded value. Fixes issue 13840.
o Code simplifications and refactoring:
- Refactor our generic strmap and digestmap types into a single
implementation, so that we can add a new digest256map type trivially.
o Directory authority changes:
- Remove turtles as a directory authority.
- Add longclaw as a new (v3) directory authority. This implements
ticket 13296. This keeps the directory authority count at 9.
o Documentation:
- Document the bridge-authority-only 'networkstatus-bridges'
file. Closes ticket 13713; patch from "tom".
o Documentation:
- Fix typo in PredictedPortsRelevanceTime option description in
manpage. Resolves issue 13707.
o Documentation:
- Stop suggesting that users specify nodes by nickname: it isn't a
good idea. Also, properly cross-reference how to specify nodes
in all parts of the manual for options that take a list of
nodes. Closes ticket 13381.
o Removed features:
- Tor clients no longer support connecting to hidden services running on
Tor 0.2.2.x and earlier; the Support022HiddenServices option has been
removed. (There shouldn't be any hidden services running these
versions on the network.) Closes ticket 7803.
o Testing:
- In the unit tests, use 'chgrp' to change the group of the unit test
temporary directory to the current user, so that the sticky bit doesn't
interfere with tests that check directory groups. Closes 13678.
Changes in version 0.2.6.1-alpha - 2014-10-30

10
changes/bug13126
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o Code simplification and refactoring:
- Remove our old, non-weighted bandwidth-based node selection code.
Previously, we used it as a fallback when we couldn't perform
weighted bandwidth-based node selection. But that would only
happen in the cases where we had no consensus, or when we had a
consensus generated by buggy or ancient directory authorities. In
either case, it's better to use the more modern, better maintained
algorithm, with reasonable defaults for the weights. Closes
ticket 13126.

7
changes/bug13214
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@ -1,7 +0,0 @@
o Minor bugfixes (hidden services):
- When fetching hidden service descriptors, check not only for
whether we got the hidden service we had in mind, but also
whether we got the particular descriptors we wanted. This
prevents a class of inefficient but annoying DoS attacks by
hidden service directories. Fixes bug 13214; bugfix on
0.2.1.6-alpha. Reported by "special".

5
changes/bug13296
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@ -1,5 +0,0 @@
o Directory authority changes:
- Remove turtles as a directory authority.
- Add longclaw as a new (v3) directory authority. This implements
ticket 13296. This keeps the directory authority count at 9.

5
changes/bug13315
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@ -1,5 +0,0 @@
o Minor features:
- Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
is enabled, reject requests with IP addresses as hostnames. Resolves
ticket 13315.

12
changes/bug13399
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@ -1,12 +0,0 @@
o Minor bugfixes:
- Use a full 256 bits of the SHA256 digest of a microdescriptor when
computing which microdescriptors to download. This keeps us from
erroneous download behavior if two microdescriptor digests ever have
the same first 160 bits. Fixes part of bug 13399; bugfix on
0.2.3.1-alpha.
- Reset a router's status if its microdescriptor digest changes,
even if the first 160 bits remain the same. Fixes part of bug
13399; bugfix on 0.2.3.1-alpha.

3
changes/bug13399_part1
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@ -1,3 +0,0 @@
o Code simplifications and refactoring:
- Refactor our generic strmap and digestmap types into a single
implementation, so that we can add a new digest256map type trivially.

5
changes/bug13447
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@ -1,5 +0,0 @@
o Minor feature:
- When re-enabling the network, don't try to build introduction circuits
until we have successfully built a circuit. This makes hidden services
come up faster when the network is re-enabled. Patch from
"akwizgran". Closes ticket 13447.

4
changes/bug13644
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@ -1,4 +0,0 @@
o Code simplifications and refactoring:
- Document all members of was_router_added_t enum and rename
ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.

5
changes/bug13678
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@ -1,5 +0,0 @@
o Testing:
- In the unit tests, use 'chgrp' to change the group of the unit test
temporary directory to the current user, so that the sticky bit doesn't
interfere with tests that check directory groups. Closes 13678.

6
changes/bug13698
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@ -1,6 +0,0 @@
o Major bugfixes:
- When closing an introduction circuit that was opened in
parallel, don't mark the introduction point as
unreachable. Previously, the first successful connection to an
introduction point would make the other uintroduction points get
marked as having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.

4
changes/bug13701
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@ -1,4 +0,0 @@
o Minor bugfixes (logging):
- Log the circuit identifier correctly in
connection_ap_handshake_attach_circuit(). Fixes bug 13701;
bugfix on 0.0.6.

4
changes/bug13707
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@ -1,4 +0,0 @@
o Documentation:
- Fix typo in PredictedPortsRelevanceTime option description in
manpage. Resolves issue 13707.

3
changes/bug13713
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@ -1,3 +0,0 @@
o Documentation:
- Document the bridge-authority-only 'networkstatus-bridges'
file. Closes ticket 13713; patch from "tom".

3
changes/bug13840
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@ -1,3 +0,0 @@
o Code simplifications and refactoring:
- In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
constant instead of hardcoded value. Fixes issue 13840.

7
changes/bug13936
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@ -1,7 +0,0 @@
o Minor bugfixes:
- Use circuit_has_opened() instead of rend_client_rendcirc_has_opened()
when a rendezvous circuit is opened because circuit_has_opened() jobs
is to call a specialized function depending on the circuit purpose.
Furthermore, a controller event will be triggered here where the
former did not. Fixes bug 13936; bugfix on 0.1.1.5-alpha.

6
changes/bug13941
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@ -1,6 +0,0 @@
o Minor bugfixes (hidden services):
- When adding a new hidden-service (for example, via SETCONF) Tor
no longer logs a congratulations for running a relay. Fixes bug
13941; bugfix on 0.2.6.1-alpha.

6
changes/bug13942
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@ -1,6 +0,0 @@
o Minor bugfixes (hidden services):
- Pre-check directory permissions for new hidden-services to avoid
at least one case of "Bug: Acting on config options left us in a
broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.

6
changes/bug14001-clang-warning
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@ -1,6 +0,0 @@
o Minor bugfixes:
- The address of an array in the middle of a structure will
always be non-NULL. clang recognises this and complains.
Disable the tautologous and redundant check to silence
this warning.
Fixes bug 14001; bugfix on 0.2.1.2-alpha.

4
changes/bug14002-osx-transproxy-ipfw-pf
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@ -1,4 +0,0 @@
o Minor features:
- OS X uses ipfw (FreeBSD) or pf (OpenBSD). Update the transparent
proxy option checks to allow for both ipfw and pf on OS X.
Closes ticket 14002.

5
changes/bug7356
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@ -1,5 +0,0 @@
o Code simplifications and refactoring:
- Add inline functions and convenience macros for quick lookup of
state component of channel_t structure. Refactor various parts of
codebase to use convenience macros instead of checking state
member of channel_t directly. Fixes issue 7356.

4
changes/bug7484
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@ -1,4 +0,0 @@
o Minor bugfixes:
- Stop allowing invalid address patterns containing both a wildcard
address and a bit prefix length. This affects all our
address-range parsing code. Fixes bug 7484; bugfix on 0.0.2pre14.

5
changes/bug7803
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@ -1,5 +0,0 @@
o Removed features:
- Tor clients no longer support connecting to hidden services running on
Tor 0.2.2.x and earlier; the Support022HiddenServices option has been
removed. (There shouldn't be any hidden services running these
versions on the network.) Closes ticket 7803.

6
changes/bug9812
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@ -1,6 +0,0 @@
o Minor bugfixes (logging):
- Downgrade warnings about RSA signature failures to info log
level. Emit a warning when extra info document is found
incompatible with a corresponding router descriptor. Fixes bug
9812; bugfix on 0.0.6rc3.

5
changes/doc13381
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@ -1,5 +0,0 @@
o Documentation:
- Stop suggesting that users specify nodes by nickname: it isn't a
good idea. Also, properly cross-reference how to specify nodes
in all parts of the manual for options that take a list of
nodes. Closes ticket 13381.

13
changes/feature13192
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@ -1,13 +0,0 @@
o Major features (hidden services):
- Add a HiddenServiceStatistics option that allows Tor relays to
gather and publish statistics about hidden service usage, to
better understand the size and volume of the hidden service
network. Specifically, if a Tor relay is an HSDir it will
publish the approximate number of hidden services that have
published descriptors to it the past 24 hours. Also, if a relay
has acted as a hidden service rendezvous point, it will publish
the approximate amount of rendezvous cells it has relayed the
past 24 hours. The statistics themselves are obfuscated so that
the exact values cannot be derived. For more details see
proposal 238 "Better hidden service stats from Tor relays". This
feature is currently disabled by default. Implements feature 13192.

4
changes/feature13212
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@ -1,4 +0,0 @@
o Minor features (hidden services):
- Inform Tor controller about nature of failure to retrieve
hidden service descriptor by sending reason string with HS_DESC
FAILED controller event. Implements feature 13212.

4
changes/feature9503
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@ -1,4 +0,0 @@
o Minor features (controller):
- Add a "SIGNAL HEARTBEAT" Tor controller command that provokes
writing unscheduled heartbeat message to the log. Implements
feature 9503.

3
changes/geoip-november2014
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@ -1,3 +0,0 @@
o Minor features:
- Update geoip to the November 15 2014 Maxmind GeoLite2 Country database.

3
changes/geoip6-november2014
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@ -1,3 +0,0 @@
o Minor features:
- Update geoip6 to the November 15 2014 Maxmind GeoLite2 Country database.

12
changes/global_scheduler
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@ -1,12 +0,0 @@
o Major features (relay, infrastructure):
- Implement a new inter-cmux comparison API, a global high/low watermark
mechanism and a global scheduler loop for transmission prioritization
across all channels as well as among circuits on one channel. This
schedule is currently tuned to (tolerantly) avoid making changes
in the current network performance, but it should form the basis
major circuit performance increases. Code by Andrea; implements
ticket 9262.
o Testing:
- New tests for many parts of channel, relay, and circuit mux
functionality. Code by Andrea; part of 9262.

3
changes/no_global_ccc
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@ -1,3 +0,0 @@
o Code Simplification and Refactoring:
- Stop using can_complete_circuits as a global variable; access it with
a function instead.

8
changes/spurious-clang-warnings
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@ -1,8 +0,0 @@
o Minor bugfixes:
- Silence clang warnings under --enable-expensive-hardening, including:
implicit truncation of 64 bit values to 32 bit;
const char assignment to self;
tautological compare; and
additional parentheses around equality tests.
Fixes bug 13577; bugfix on 0.2.5.4-alpha.

5
changes/ticket-11291
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@ -1,5 +0,0 @@
o Minor features (hidden services):
- New HiddenServiceDirGroupReadable option to cause hidden service
directories and hostname files to be created group-readable.
Patch from "anon", David Stainton, and "meejah".
Closes ticket 11291.

4
changes/ticket13172
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@ -1,4 +0,0 @@
o Code simplification and refactoring:
- Avoid using operators directly as macro arguments: this lets us
apply coccinelle transformations to our codebase more
directly. Closes ticket 13172.

6
changes/tickets6456
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@ -1,6 +0,0 @@
o Code simplification and refactoring:
- Combine the functions used to parse ClientTransportPlugin and
ServerTransportPlugin into a single function. Closes ticket 6456.
o Testing:
- New tests for parse_transport_line(). Part of ticket 6456.