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@@ -1,3 +1,135 @@
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+Changes in version 0.2.3.1-alpha - 2011-05-0?
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+
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+ Tor 0.2.3.1-alpha adds some new experimental features, including support
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+ for an improved network IO backend, IOCP networking on Windows,
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+ microdescriptor caching, "fast-start" support for streams, and automatic
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+ home router configuration. There are also numerous internal improvements
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+ to try to make the code easier for developers to work with.
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+
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+ o Major features
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+ - Tor can now optionally build with the "bufferevents" buffered IO
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+ backend provided by Libevent 2. To use this feature, make sure you
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+ have the latest possible version of Libevent, and pass the
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+ --enable-bufferevents flag to configure when building Tor from source.
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+ Using this feature will make our networking code more flexible, let us
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+ stack layers on each other, and let us use more efficient zero-copy
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+ transports where available.
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+ - As an experimental feature, Tor can use IOCP for networking on Windows.
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+ Once this code is tuned and optimized, it promises much better
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+ performance than the select-based backend we've used in the past. To
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+ try this feature, you must build Tor with Libevent 2, configure Tor
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+ with the "bufferevents" buffered IO backend, and add "DisableIOCP 0" to
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+ your torrc. There are known bugs here: only try this if you can help
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+ debug it as it breaks.
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+ - The EntryNodes option can now include country codes like {de} or IP
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+ addresses or network masks. Previously we had disallowed these options
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+ because we didn't have an efficient way to keep the list up to
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+ date. Fixes bug 1982.
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+ - Exit nodes now accept and queue data on not-yet-connected streams.
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+ Previously, the client wasn't allowed to send data until the stream was
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+ connected, which slowed down all connections. This change will enable
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+ clients to perform a "fast-start" on streams and send data without
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+ having to wait for a confirmation that the stream has opened. (Patch
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+ from Ian Goldberg; implements the server side of Proposal 174.)
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+ - Tor now has initial support for automatic port mapping on on the many
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+ home routers that support NAT-PMP or UPnP. (Not yet supported on
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+ Windows). To build the support code, you'll need to have libnatpnp
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+ library and/or the libminiupnpc library, and you'll need to enable the
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+ feature specifically by passing "--enable-upnp" and/or
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+ "--enable-natpnp" to configure. To turn it on, use the new
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+ PortForwarding option.
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+ - Caches now download, cache, and sever multiple "flavors" of the
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+ consensus, including a flavor that describes microdescriptors.
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+ - Caches now download, cache, and serve microdescriptors -- small
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+ summaries of router descriptors that are authenticated by all of the
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+ directory authorities. Once enough caches are running this code,
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+ clients will be able to save significant amounts of directory bandwidth
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+ by downloading microdescriptors instead of router descriptors.
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+
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+ o Minor features:
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+ - Make logging resolution configurable and change default from 1
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+ millisecond to 1 second. Implements enhancement 1668.
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+ - We log which torrc file we're using on startup. Implements ticket 2444.
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+ - Ordinarily, Tor does not count traffic from private addresses (like
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+ 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
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+ There is now a new option, CountPrivateBandwidth, to disable this
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+ behavior. Patch from Daniel Cagara.
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+ - New --enable-static-tor configure option for building Tor as statically
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+ as possible. Idea, general hackery and thoughts from Alexei Czeskis,
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+ John Gilmore, Jacob Appelbaum. Implements ticket 2702.
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+ - If you set the NumCPUs option to 0, Tor will now try to detect how many
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+ CPUs you have. This is the new default behavior.
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+ - Turn on directory request statistics by default and include them in
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+ extra-info descriptors. Don't break if we have no GeoIP database.
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+ - Relays that set "ConnDirectionStatistics 1" write statistics on the
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+ bidirectional use of connections to disk every 24 hours.
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+ - Add a GeoIP file digest to the extra-info descriptor. Implements
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+ enhancement 1883.
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+ - Add a new 'Heartbeat' log message type to periodically log a message
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+ describing Tor's status at level Notice. This feature is meant for
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+ operators who log at notice, adn want to make sure that their Tor
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+ server is still working. Implementation by George Kadianakis.
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+
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+ o Minor bugfixes (on 0.2.2.25-alpha):
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+ - When loading the microdesc journal, remember its current size.
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+ In 0.2.2, this helps prevent the microdesc journal from growing
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+ without limit on authorities (who are the only ones to use it in
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+ 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
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+ Fix posted by "cypherpunks."
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+ - The microdesc journal is supposed to get rebuilt only if it is
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+ at least _half_ the length of the store, not _twice_ the length
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+ of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
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+ - Authorities now clean their microdesc cache periodically and when
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+ reading from disk initially, not only when adding new descriptors.
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+ This prevents a bug where we could lose microdescriptors. Bugfix
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+ on 0.2.2.6-alpha.
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+
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+ o Minor features (controller)
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+ - Add a new SIGNAL event to the controller interface so that
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+ controllers can be notified when Tor handles a signal. Resolves
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+ issue 1955. Patch by John Brooks.
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+ - Add a new GETINFO option to get total bytes read and written. Patch
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+ from pipe, revised by atagar. Resolves ticket 2345.
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+ - Implement some GETINFO controller fields to provide information about
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+ the Tor process's pid, euid, username, and resource limits.
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+
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+ o Build changes
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+ - Our build system requires automake 1.6 or later to create the
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+ Makefile.in files. Previously, you could have used 1.4.
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+ This only affects developers and people building Tor from git;
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+ people who build Tor from the source distribution without changing
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+ the Makefile.am files should be fine.
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+ - Our autogen.sh script uses autoreconf to launch autoconf, automake, and
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+ so on. This is more robust against some of the failure modes
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+ associated with running the autotools pieces on their own.
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+
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+ o Minor packaging issues:
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+ - On OpenSUSE, create the /var/run/tor directory on startup if it is not
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+ already created. Patch from Andreas Stieger. Fixes bug 2573.
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+
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+ o Code simplifications and refactoring:
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+ - A major revision to our internal node-selecting and listing logic.
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+ Tor already had at least two major ways to look at the question of
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+ "which Tor servers do we know about": a list of router descriptors,
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+ and a list of entries in the current consensus. With
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+ microdescriptors, we're adding a third. Having so many systems
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+ without an abstraction layer over them was hurting the codebase.
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+ Now, we have a new "node_t" abstraction that presents a consistent
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+ interface to a client's view of a Tor node, and holds (nearly) all
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+ of the mutable state formerly in routerinfo_t and routerstatus_t.
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+ - The helper programs tor-gencert, tor-resolve, and tor-checkkey
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+ no longer link against Libevent: they never used it, but
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+ our library structure used to force them to link it.
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+
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+ o Removed features:
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+ - Removed some old code to work around even older versions of Tor that
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+ used forked processes to handle DNS requests. Such versions of Tor
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+ are no longer in use as servers.
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+
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+ o Documentation fixes:
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+ - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
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+
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+
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Changes in version 0.2.2.25-alpha - 2011-04-29
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Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
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robust, routers no longer overreport their bandwidth, Win7 should crash
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Nick Mathewson