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ChangeLog：源码内容

- Report events where a resolve succeeded or where we got a socks
protocol error correctly, rather than calling both of them
"INTERNAL".
- Change reported stream target addresses to IP consistently when
we finally get the IP from an exit node.
- Send log messages to the controller even if they happen to be very
long.
o Minor bugfixes (other):
- Display correct results when reporting which versions are
recommended, and how recommended they are. (Resolves bug 383.)
- Improve our estimates for directory bandwidth to be less random:
guess that an unrecognized directory will have the average bandwidth
from all known directories, not that it will have the average
bandwidth from those directories earlier than it on the list.
- If we start a server with ClientOnly 1, then set ClientOnly to 0
and hup, stop triggering an assert based on an empty onion_key.
- On platforms with no working mmap() equivalent, don't warn the
user when cached-routers doesn't exist.
- Warn the user when mmap() [or its equivalent] fails for some reason
other than file-not-found.
- Don't warn the user when cached-routers.new doesn't exist: that's
perfectly fine when starting up for the first time.
- When EntryNodes are configured, rebuild the guard list to contain,
in order: the EntryNodes that were guards before; the rest of the
EntryNodes; the nodes that were guards before.
- Mask out all signals in sub-threads; only the libevent signal
handler should be processing them. This should prevent some crashes
on some machines using pthreads. (Patch from coderman.)
- Fix switched arguments on memset in the implementation of
tor_munmap() for systems with no mmap() call.
- When Tor receives a router descriptor that it asked for, but
no longer wants (because it has received fresh networkstatuses
in the meantime), do not warn the user. Cache the descriptor if
we're a cache; drop it if we aren't.
- Make earlier entry guards _really_ get retried when the network
comes back online.
- On a malformed DNS reply, always give an error to the corresponding
DNS request.
- Build with recent libevents on platforms that do not define the
nonstandard types "u_int8_t" and friends.
o Minor features (controller):
- Warn the user when an application uses the obsolete binary v0
control protocol. We're planning to remove support for it during
the next development series, so it's good to give people some
advance warning.
- Add STREAM_BW events to report per-entry-stream bandwidth
use. (Patch from Robert Hogan.)
- Rate-limit SIGNEWNYM signals in response to controllers that
impolitely generate them for every single stream. (Patch from
mwenge; closes bug 394.)
- Make REMAP stream events have a SOURCE (cache or exit), and
make them generated in every case where we get a successful
connected or resolved cell.
o Minor bugfixes (performance):
- Call router_have_min_dir_info half as often. (This is showing up in
some profiles, but not others.)
- When using GCC, make log_debug never get called at all, and its
arguments never get evaluated, when no debug logs are configured.
(This is showing up in some profiles, but not others.)
o Minor features:
- Remove some never-implemented options. Mark PathlenCoinWeight as
obsolete.
- Implement proposal 106: Stop requiring clients to have well-formed
certificates; stop checking nicknames in certificates. (Clients
have certificates so that they can look like Tor servers, but in
the future we might want to allow them to look like regular TLS
clients instead. Nicknames in certificates serve no purpose other
than making our protocol easier to recognize on the wire.)
- Revise messages on handshake failure again to be even more clear about
which are incoming connections and which are outgoing.
- Discard any v1 directory info that's over 1 month old (for
directories) or over 1 week old (for running-routers lists).
- Do not warn when individual nodes in the configuration's EntryNodes,
ExitNodes, etc are down: warn only when all possible nodes
are down. (Fixes bug 348.)
- Always remove expired routers and networkstatus docs before checking
whether we have enough information to build circuits. (Fixes
bug 373.)
- Put a lower-bound on MaxAdvertisedBandwidth.
Changes in version 0.1.2.7-alpha - 2007-02-06
o Major bugfixes (rate limiting):
- Servers decline directory requests much more aggressively when
they're low on bandwidth. Otherwise they end up queueing more and
more directory responses, which can't be good for latency.
- But never refuse directory requests from local addresses.
- Fix a memory leak when sending a 503 response for a networkstatus
request.
- Be willing to read or write on local connections (e.g. controller
connections) even when the global rate limiting buckets are empty.
- If our system clock jumps back in time, don't publish a negative
uptime in the descriptor. Also, don't let the global rate limiting
buckets go absurdly negative.
- Flush local controller connection buffers periodically as we're
writing to them, so we avoid queueing 4+ megabytes of data before
trying to flush.
o Major bugfixes (NT services):
- Install as NT_AUTHORITYLocalService rather than as SYSTEM; add a
command-line flag so that admins can override the default by saying
"tor --service install --user "SomeUser"". This will not affect
existing installed services. Also, warn the user that the service
will look for its configuration file in the service user's
%appdata% directory. (We can't do the 'hardwire the user's appdata
directory' trick any more, since we may not have read access to that
directory.)
o Major bugfixes (other):
- Previously, we would cache up to 16 old networkstatus documents
indefinitely, if they came from nontrusted authorities. Now we
discard them if they are more than 10 days old.
- Fix a crash bug in the presence of DNS hijacking (reported by Andrew
Del Vecchio).
- Detect and reject malformed DNS responses containing circular
pointer loops.
- If exits are rare enough that we're not marking exits as guards,
ignore exit bandwidth when we're deciding the required bandwidth
to become a guard.
- When we're handling a directory connection tunneled over Tor,
don't fill up internal memory buffers with all the data we want
to tunnel; instead, only add it if the OR connection that will
eventually receive it has some room for it. (This can lead to
slowdowns in tunneled dir connections; a better solution will have
to wait for 0.2.0.)
o Minor bugfixes (dns):
- Add some defensive programming to eventdns.c in an attempt to catch
possible memory-stomping bugs.
- Detect and reject DNS replies containing IPv4 or IPv6 records with
an incorrect number of bytes. (Previously, we would ignore the
extra bytes.)
- Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
in the correct order, and doesn't crash.
- Free memory held in recently-completed DNS lookup attempts on exit.
This was not a memory leak, but may have been hiding memory leaks.
- Handle TTL values correctly on reverse DNS lookups.
- Treat failure to parse resolv.conf as an error.
o Minor bugfixes (other):
- Fix crash with "tor --list-fingerprint" (reported by seeess).
- When computing clock skew from directory HTTP headers, consider what
time it was when we finished asking for the directory, not what
time it is now.
- Expire socks connections if they spend too long waiting for the
handshake to finish. Previously we would let them sit around for
days, if the connecting application didn't close them either.
- And if the socks handshake hasn't started, don't send a
"DNS resolve socks failed" handshake reply; just close it.
- Stop using C functions that OpenBSD's linker doesn't like.
- Don't launch requests for descriptors unless we have networkstatuses
from at least half of the authorities. This delays the first
download slightly under pathological circumstances, but can prevent
us from downloading a bunch of descriptors we don't need.
- Do not log IPs with TLS failures for incoming TLS
connections. (Fixes bug 382.)
- If the user asks to use invalid exit nodes, be willing to use
unstable ones.
- Stop using the reserved ac_cv namespace in our configure script.
- Call stat() slightly less often; use fstat() when possible.
- Refactor the way we handle pending circuits when an OR connection
completes or fails, in an attempt to fix a rare crash bug.
- Only rewrite a conn's address based on X-Forwarded-For: headers
if it's a parseable public IP address; and stop adding extra quotes
to the resulting address.
o Major features:
- Weight directory requests by advertised bandwidth. Now we can
let servers enable write limiting but still allow most clients to
succeed at their directory requests. (We still ignore weights when
choosing a directory authority; I hope this is a feature.)
o Minor features:
- Create a new file ReleaseNotes which was the old ChangeLog. The
new ChangeLog file now includes the summaries for all development
versions too.
- Check for addresses with invalid characters at the exit as well
as at the client, and warn less verbosely when they fail. You can
override this by setting ServerDNSAllowNonRFC953Addresses to 1.
- Adapt a patch from goodell to let the contrib/exitlist script
take arguments rather than require direct editing.
- Inform the server operator when we decide not to advertise a
DirPort due to AccountingMax enabled or a low BandwidthRate. It
was confusing Zax, so now we're hopefully more helpful.
- Bring us one step closer to being able to establish an encrypted
directory tunnel without knowing a descriptor first. Still not
ready yet. As part of the change, now assume we can use a
create_fast cell if we don't know anything about a router.
- Allow exit nodes to use nameservers running on ports other than 53.
- Servers now cache reverse DNS replies.
- Add an --ignore-missing-torrc command-line option so that we can
get the "use sensible defaults if the configuration file doesn't
exist" behavior even when specifying a torrc location on the command
line.
o Minor features (controller):
- Track reasons for OR connection failure; make these reasons
available via the controller interface. (Patch from Mike Perry.)
- Add a SOCKS_BAD_HOSTNAME client status event so controllers
can learn when clients are sending malformed hostnames to Tor.
- Clean up documentation for controller status events.
- Add a REMAP status to stream events to note that a stream's
address has changed because of a cached address or a MapAddress
directive.
Changes in version 0.1.2.6-alpha - 2007-01-09
o Major bugfixes:
- Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
connection handles more than 4 gigs in either direction, we crash.
- Fix an assert error introduced in 0.1.2.5-alpha: if we're an
advertised exit node, somebody might try to exit from us when
we're bootstrapping and before we've built our descriptor yet.
Refuse the connection rather than crashing.
o Minor bugfixes:
- Warn if we (as a server) find that we've resolved an address that we
weren't planning to resolve.
- Warn that using select() on any libevent version before 1.1 will be
unnecessarily slow (even for select()).
- Flush ERR-level controller status events just like we currently
flush ERR-level log events, so that a Tor shutdown doesn't prevent
the controller from learning about current events.
o Minor features (more controller status events):
- Implement EXTERNAL_ADDRESS server status event so controllers can
learn when our address changes.
- Implement BAD_SERVER_DESCRIPTOR server status event so controllers
can learn when directories reject our descriptor.
- Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
can learn when a client application is speaking a non-socks protocol
to our SocksPort.
- Implement DANGEROUS_SOCKS client status event so controllers
can learn when a client application is leaking DNS addresses.
- Implement BUG general status event so controllers can learn when
Tor is unhappy about its internal invariants.
- Implement CLOCK_SKEW general status event so controllers can learn
when Tor thinks the system clock is set incorrectly.
- Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
server status events so controllers can learn when their descriptors
are accepted by a directory.
- Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
server status events so controllers can learn about Tor's progress in
deciding whether it's reachable from the outside.
- Implement BAD_LIBEVENT general status event so controllers can learn
when we have a version/method combination in libevent that needs to
be changed.
- Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
and DNS_USELESS server status events so controllers can learn
about changes to DNS server status.
o Minor features (directory):
- Authorities no longer recommend exits as guards if this would shift
too much load to the exit nodes.
Changes in version 0.1.2.5-alpha - 2007-01-06
o Major features:
- Enable write limiting as well as read limiting. Now we sacrifice
capacity if we're pushing out lots of directory traffic, rather
than overrunning the user's intended bandwidth limits.
- Include TLS overhead when counting bandwidth usage; previously, we
would count only the bytes sent over TLS, but not the bytes used
to send them.
- Support running the Tor service with a torrc not in the same
directory as tor.exe and default to using the torrc located in
the %appdata%Tor of the user who installed the service. Patch
from Matt Edman.
- Servers now check for the case when common DNS requests are going to
wildcarded addresses (i.e. all getting the same answer), and change
their exit policy to reject *:* if it's happening.
- Implement BEGIN_DIR cells, so we can connect to the directory
server via TLS to do encrypted directory requests rather than
plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
config options if you like.
o Minor features (config and docs):
- Start using the state file to store bandwidth accounting data:
the bw_accounting file is now obsolete. We'll keep generating it
for a while for people who are still using 0.1.2.4-alpha.
- Try to batch changes to the state file so that we do as few
disk writes as possible while still storing important things in
a timely fashion.
- The state file and the bw_accounting file get saved less often when
the AvoidDiskWrites config option is set.
- Make PIDFile work on Windows (untested).
- Add internal descriptions for a bunch of configuration options:
accessible via controller interface and in comments in saved
options files.
- Reject *:563 (NNTPS) in the default exit policy. We already reject
NNTP by default, so this seems like a sensible addition.
- Clients now reject hostnames with invalid characters. This should
avoid some inadvertent info leaks. Add an option
AllowNonRFC953Hostnames to disable this behavior, in case somebody
is running a private network with hosts called @, !, and #.
- Add a maintainer script to tell us which options are missing
documentation: "make check-docs".
- Add a new address-spec.txt document to describe our special-case
addresses: .exit, .onion, and .noconnnect.
o Minor features (DNS):
- Ongoing work on eventdns infrastructure: now it has dns server
and ipv6 support. One day Tor will make use of it.
- Add client-side caching for reverse DNS lookups.
- Add support to tor-resolve tool for reverse lookups and SOCKS5.
- When we change nameservers or IP addresses, reset and re-launch
our tests for DNS hijacking.
o Minor features (directory):
- Authorities now specify server versions in networkstatus. This adds
about 2% to the size of compressed networkstatus docs, and allows
clients to tell which servers support BEGIN_DIR and which don't.
The implementation is forward-compatible with a proposed future
protocol version scheme not tied to Tor versions.
- DirServer configuration lines now have an orport= option so
clients can open encrypted tunnels to the authorities without
having downloaded their descriptors yet. Enabled for moria1,
moria2, tor26, and lefkada now in the default configuration.
- Directory servers are more willing to send a 503 "busy" if they
are near their write limit, especially for v1 directory requests.
Now they can use their limited bandwidth for actual Tor traffic.
- Clients track responses with status 503 from dirservers. After a
dirserver has given us a 503, we try not to use it until an hour has
gone by, or until we have no dirservers that haven't given us a 503.
- When we get a 503 from a directory, and we're not a server, we don't
count the failure against the total number of failures allowed
for the thing we're trying to download.
- Report X-Your-Address-Is correctly from tunneled directory
connections; don't report X-Your-Address-Is when it's an internal
address; and never believe reported remote addresses when they're
internal.
- Protect against an unlikely DoS attack on directory servers.
- Add a BadDirectory flag to network status docs so that authorities
can (eventually) tell clients about caches they believe to be
broken.
o Minor features (controller):
- Have GETINFO dir/status/* work on hosts with DirPort disabled.
- Reimplement GETINFO so that info/names stays in sync with the
actual keys.
- Implement "GETINFO fingerprint".
- Implement "SETEVENTS GUARD" so controllers can get updates on
entry guard status as it changes.
o Minor features (clean up obsolete pieces):
- Remove some options that have been deprecated since at least
0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
to set log options.
- We no longer look for identity and onion keys in "identity.key" and
"onion.key" -- these were replaced by secret_id_key and
secret_onion_key in 0.0.8pre1.
- We no longer require unrecognized directory entries to be
preceded by "opt".
o Major bugfixes (security):
- Stop sending the HttpProxyAuthenticator string to directory
servers when directory connections are tunnelled through Tor.
- Clients no longer store bandwidth history in the state file.
- Do not log introduction points for hidden services if SafeLogging
is set.
- When generating bandwidth history, round down to the nearest
1k. When storing accounting data, round up to the nearest 1k.
- When we're running as a server, remember when we last rotated onion
keys, so that we will rotate keys once they're a week old even if
we never stay up for a week ourselves.
o Major bugfixes (other):
- Fix a longstanding bug in eventdns that prevented the count of
timed-out resolves from ever being reset. This bug caused us to
give up on a nameserver the third time it timed out, and try it
10 seconds later... and to give up on it every time it timed out
after that.
- Take out the '5 second' timeout from the connection retry
schedule. Now the first connect attempt will wait a full 10
seconds before switching to a new circuit. Perhaps this will help
a lot. Based on observations from Mike Perry.
- Fix a bug on the Windows implementation of tor_mmap_file() that
would prevent the cached-routers file from ever loading. Reported
by John Kimble.
o Minor bugfixes:
- Fix an assert failure when a directory authority sets
AuthDirRejectUnlisted and then receives a descriptor from an
unlisted router. Reported by seeess.
- Avoid a double-free when parsing malformed DirServer lines.
- Fix a bug when a BSD-style PF socket is first used. Patch from
Fabian Keil.
- Fix a bug in 0.1.2.2-alpha that prevented clients from asking
to resolve an address at a given exit node even when they ask for
it by name.
- Servers no longer ever list themselves in their "family" line,
even if configured to do so. This makes it easier to configure
family lists conveniently.
- When running as a server, don't fall back to 127.0.0.1 when no
nameservers are configured in /etc/resolv.conf; instead, make the
user fix resolv.conf or specify nameservers explicitly. (Resolves
bug 363.)
- Stop accepting certain malformed ports in configured exit policies.
- Don't re-write the fingerprint file every restart, unless it has
changed.
- Stop warning when a single nameserver fails: only warn when _all_ of
our nameservers have failed. Also, when we only have one nameserver,
raise the threshold for deciding that the nameserver is dead.
- Directory authorities now only decide that routers are reachable
if their identity keys are as expected.
- When the user uses bad syntax in the Log config line, stop
suggesting other bad syntax as a replacement.
- Correctly detect ipv6 DNS capability on OpenBSD.
o Minor bugfixes (controller):
- Report the circuit number correctly in STREAM CLOSED events. Bug
reported by Mike Perry.
- Do not report bizarre values for results of accounting GETINFOs
when the last second's write or read exceeds the allotted bandwidth.
- Report "unrecognized key" rather than an empty string when the
controller tries to fetch a networkstatus that doesn't exist.
Changes in version 0.1.1.26 - 2006-12-14
o Security bugfixes:
- Stop sending the HttpProxyAuthenticator string to directory
servers when directory connections are tunnelled through Tor.
- Clients no longer store bandwidth history in the state file.
- Do not log introduction points for hidden services if SafeLogging
is set.
o Minor bugfixes:
- Fix an assert failure when a directory authority sets
AuthDirRejectUnlisted and then receives a descriptor from an
unlisted router (reported by seeess).
Changes in version 0.1.2.4-alpha - 2006-12-03
o Major features:
- Add support for using natd; this allows FreeBSDs earlier than
5.1.2 to have ipfw send connections through Tor without using
SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
o Minor features:
- Make all connections to addresses of the form ".noconnect"
immediately get closed. This lets application/controller combos
successfully test whether they're talking to the same Tor by
watching for STREAM events.
- Make cross.sh cross-compilation script work even when autogen.sh
hasn't been run. (Patch from Michael Mohr.)
- Statistics dumped by -USR2 now include a breakdown of public key
operations, for profiling.
o Major bugfixes:
- Fix a major leak when directory authorities parse their
approved-routers list, a minor memory leak when we fail to pick
an exit node, and a few rare leaks on errors.
- Handle TransPort connections even when the server sends data before
the client sends data. Previously, the connection would just hang
until the client sent data. (Patch from tup based on patch from
Zajcev Evgeny.)
- Avoid assert failure when our cached-routers file is empty on
startup.
o Minor bugfixes:
- Don't log spurious warnings when we see a circuit close reason we
don't recognize; it's probably just from a newer version of Tor.
- Have directory authorities allow larger amounts of drift in uptime
without replacing the server descriptor: previously, a server that
restarted every 30 minutes could have 48 "interesting" descriptors
per day.
- Start linking to the Tor specification and Tor reference manual
correctly in the Windows installer.
- Add Vidalia to the OS X uninstaller script, so when we uninstall
Tor/Privoxy we also uninstall Vidalia.
- Resume building on Irix64, and fix a lot of warnings from its
MIPSpro C compiler.
- Don't corrupt last_guessed_ip in router_new_address_suggestion()
when we're running as a client.
Changes in version 0.1.1.25 - 2006-11-04
o Major bugfixes:
- When a client asks us to resolve (rather than connect to)
an address, and we have a cached answer, give them the cached
answer. Previously, we would give them no answer at all.
- We were building exactly the wrong circuits when we predict
hidden service requirements, meaning Tor would have to build all
its circuits on demand.
- If none of our live entry guards have a high uptime, but we
require a guard with a high uptime, try adding a new guard before
we give up on the requirement. This patch should make long-lived
connections more stable on average.
- When testing reachability of our DirPort, don't launch new
tests when there's already one in progress -- unreachable
servers were stacking up dozens of testing streams.
o Security bugfixes:
- When the user sends a NEWNYM signal, clear the client-side DNS
cache too. Otherwise we continue to act on previous information.
o Minor bugfixes:
- Avoid a memory corruption bug when creating a hash table for
the first time.
- Avoid possibility of controller-triggered crash when misusing
certain commands from a v0 controller on platforms that do not
handle printf("%s",NULL) gracefully.
- Avoid infinite loop on unexpected controller input.
- Don't log spurious warnings when we see a circuit close reason we
don't recognize; it's probably just from a newer version of Tor.
- Add Vidalia to the OS X uninstaller script, so when we uninstall
Tor/Privoxy we also uninstall Vidalia.
Changes in version 0.1.2.3-alpha - 2006-10-29
o Minor features:
- Prepare for servers to publish descriptors less often: never
discard a descriptor simply for being too old until either it is
recommended by no authorities, or until we get a better one for
the same router. Make caches consider retaining old recommended
routers for even longer.
- If most authorities set a BadExit flag for a server, clients
don't think of it as a general-purpose exit. Clients only consider
authorities that advertise themselves as listing bad exits.
- Directory servers now provide 'Pragma: no-cache' and 'Expires'
headers for content, so that we can work better in the presence of
caching HTTP proxies.
- Allow authorities to list nodes as bad exits by fingerprint or by
address.
o Minor features, controller:
- Add a REASON field to CIRC events; for backward compatibility, this
field is sent only to controllers that have enabled the extended
event format. Also, add additional reason codes to explain why
a given circuit has been destroyed or truncated. (Patches from
Mike Perry)
- Add a REMOTE_REASON field to extended CIRC events to tell the
controller about why a remote OR told us to close a circuit.
- Stream events also now have REASON and REMOTE_REASON fields,
working much like those for circuit events.
- There's now a GETINFO ns/... field so that controllers can ask Tor
about the current status of a router.
- A new event type "NS" to inform a controller when our opinion of
a router's status has changed.
- Add a GETINFO events/names and GETINFO features/names so controllers
can tell which events and features are supported.
- A new CLEARDNSCACHE signal to allow controllers to clear the
client-side DNS cache without expiring circuits.
o Security bugfixes:
- When the user sends a NEWNYM signal, clear the client-side DNS
cache too. Otherwise we continue to act on previous information.
o Minor bugfixes:
- Avoid sending junk to controllers or segfaulting when a controller
uses EVENT_NEW_DESC with verbose nicknames.
- Stop triggering asserts if the controller tries to extend hidden
service circuits (reported by mwenge).
- Avoid infinite loop on unexpected controller input.
- When the controller does a "GETINFO network-status", tell it
about even those routers whose descriptors are very old, and use
long nicknames where appropriate.
- Change NT service functions to be loaded on demand. This lets us
build with MinGW without breaking Tor for Windows 98 users.
- Do DirPort reachability tests less often, since a single test
chews through many circuits before giving up.
- In the hidden service example in torrc.sample, stop recommending
esoteric and discouraged hidden service options.
- When stopping an NT service, wait up to 10 sec for it to actually
stop. (Patch from Matt Edman; resolves bug 295.)
- Fix handling of verbose nicknames with ORCONN controller events:
make them show up exactly when requested, rather than exactly when
not requested.
- When reporting verbose nicknames in entry_guards_getinfo(), avoid
printing a duplicate "$" in the keys we send (reported by mwenge).
- Correctly set maximum connection limit on Cygwin. (This time
for sure!)
- Try to detect Windows correctly when cross-compiling.
- Detect the size of the routers file correctly even if it is
corrupted (on systems without mmap) or not page-aligned (on systems
with mmap). This bug was harmless.
- Sometimes we didn't bother sending a RELAY_END cell when an attempt
to open a stream fails; now we do in more cases. This should
make clients able to find a good exit faster in some cases, since
unhandleable requests will now get an error rather than timing out.
- Resolve two memory leaks when rebuilding the on-disk router cache
(reported by fookoowa).
- Clean up minor code warnings suggested by the MIPSpro C compiler,
and reported by some Centos users.
- Controller signals now work on non-Unix platforms that don't define
SIGUSR1 and SIGUSR2 the way we expect.
- Patch from Michael Mohr to contrib/cross.sh, so it checks more
values before failing, and always enables eventdns.
- Libevent-1.2 exports, but does not define in its headers, strlcpy.
Try to fix this in configure.in by checking for most functions
before we check for libevent.
Changes in version 0.1.2.2-alpha - 2006-10-07
o Major features:
- Make our async eventdns library on-by-default for Tor servers,
and plan to deprecate the separate dnsworker threads.
- Add server-side support for "reverse" DNS lookups (using PTR
records so clients can determine the canonical hostname for a given
IPv4 address). Only supported by servers using eventdns; servers
now announce in their descriptors whether they support eventdns.
- Specify and implement client-side SOCKS5 interface for reverse DNS
lookups (see doc/socks-extensions.txt).
- Add a BEGIN_DIR relay cell type for an easier in-protocol way to
connect to directory servers through Tor. Previously, clients needed
to find Tor exits to make private connections to directory servers.
- Avoid choosing Exit nodes for entry or middle hops when the
total bandwidth available from non-Exit nodes is much higher than
the total bandwidth available from Exit nodes.
- Workaround for name servers (like Earthlink's) that hijack failing
DNS requests and replace the no-such-server answer with a "helpful"
redirect to an advertising-driven search portal. Also work around
DNS hijackers who "helpfully" decline to hijack known-invalid
RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
lets you turn it off.
- Send out a burst of long-range padding cells once we've established
that we're reachable. Spread them over 4 circuits, so hopefully
a few will be fast. This exercises our bandwidth and bootstraps
us into the directory more quickly.
o New/improved config options:
- Add new config option "ResolvConf" to let the server operator
choose an alternate resolve.conf file when using eventdns.
- Add an "EnforceDistinctSubnets" option to control our "exclude
servers on the same /16" behavior. It's still on by default; this
is mostly for people who want to operate private test networks with
all the machines on the same subnet.
- If one of our entry guards is on the ExcludeNodes list, or the
directory authorities don't think it's a good guard, treat it as
if it were unlisted: stop using it as a guard, and throw it off
the guards list if it stays that way for a long time.
- Allow directory authorities to be marked separately as authorities
for the v1 directory protocol, the v2 directory protocol, and
as hidden service directories, to make it easier to retire old
authorities. V1 authorities should set "HSAuthoritativeDir 1"
to continue being hidden service authorities too.
- Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
o Minor features, controller:
- Fix CIRC controller events so that controllers can learn the
identity digests of non-Named servers used in circuit paths.
- Let controllers ask for more useful identifiers for servers. Instead
of learning identity digests for un-Named servers and nicknames
for Named servers, the new identifiers include digest, nickname,
and indication of Named status. Off by default; see control-spec.txt
for more information.
- Add a "getinfo address" controller command so it can display Tor's
best guess to the user.
- New controller event to alert the controller when our server
descriptor has changed.
- Give more meaningful errors on controller authentication failure.
o Minor features, other:
- When asked to resolve a hostname, don't use non-exit servers unless
requested to do so. This allows servers with broken DNS to be
useful to the network.
- Divide eventdns log messages into warn and info messages.
- Reserve the nickname "Unnamed" for routers that can't pick
a hostname: any router can call itself Unnamed; directory
authorities will never allocate Unnamed to any particular router;
clients won't believe that any router is the canonical Unnamed.
- Only include function names in log messages for info/debug messages.
For notice/warn/err, the content of the message should be clear on
its own, and printing the function name only confuses users.
- Avoid some false positives during reachability testing: don't try
to test via a server that's on the same /24 as us.
- If we fail to build a circuit to an intended enclave, and it's
not mandatory that we use that enclave, stop wanting it.
- When eventdns is enabled, allow multithreaded builds on NetBSD and
OpenBSD. (We had previously disabled threads on these platforms
because they didn't have working thread-safe resolver functions.)
o Major bugfixes, anonymity/security:
- If a client asked for a server by name, and there's a named server
in our network-status but we don't have its descriptor yet, we
could return an unnamed server instead.
- Fix NetBSD bug that could allow someone to force uninitialized RAM
to be sent to a server's DNS resolver. This only affects NetBSD
and other platforms that do not bounds-check tolower().
- Reject (most) attempts to use Tor circuits with length one. (If
many people start using Tor as a one-hop proxy, exit nodes become
a more attractive target for compromise.)
- Just because your DirPort is open doesn't mean people should be
able to remotely teach you about hidden service descriptors. Now
only accept rendezvous posts if you've got HSAuthoritativeDir set.
o Major bugfixes, other:
- Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
- When a client asks the server to resolve (not connect to)
an address, and it has a cached answer, give them the cached answer.
Previously, the server would give them no answer at all.
- Allow really slow clients to not hang up five minutes into their
directory downloads (suggested by Adam J. Richter).
- We were building exactly the wrong circuits when we anticipated
hidden service requirements, meaning Tor would have to build all
its circuits on demand.
- Avoid crashing when we mmap a router cache file of size 0.
- When testing reachability of our DirPort, don't launch new
tests when there's already one in progress -- unreachable
servers were stacking up dozens of testing streams.
o Minor bugfixes, correctness:
- If we're a directory mirror and we ask for "all" network status
documents, we would discard status documents from authorities
we don't recognize.
- Avoid a memory corruption bug when creating a hash table for
the first time.
- Avoid controller-triggered crash when misusing certain commands
from a v0 controller on platforms that do not handle
printf("%s",NULL) gracefully.
- Don't crash when a controller sends a third argument to an
"extendcircuit" request.
- Controller protocol fixes: fix encoding in "getinfo addr-mappings"
response; fix error code when "getinfo dir/status/" fails.
- Avoid crash when telling controller stream-status and a stream
is detached.
- Patch from Adam Langley to fix assert() in eventdns.c.
- Fix a debug log message in eventdns to say "X resolved to Y"
instead of "X resolved to X".
- Make eventdns give strings for DNS errors, not just error numbers.
- Track unreachable entry guards correctly: don't conflate
'unreachable by us right now' with 'listed as down by the directory
authorities'. With the old code, if a guard was unreachable by
us but listed as running, it would clog our guard list forever.
- Behave correctly in case we ever have a network with more than
2GB/s total advertised capacity.
- Make TrackExitHosts case-insensitive, and fix the behavior of
".suffix" TrackExitHosts items to avoid matching in the middle of
an address.
- Finally fix the openssl warnings from newer gccs that believe that
ignoring a return value is okay, but casting a return value and
then ignoring it is a sign of madness.
- Prevent the contrib/exitlist script from printing the same
result more than once.
- Patch from Steve Hildrey: Generate network status correctly on
non-versioning dirservers.
- Don't listen to the X-Your-Address-Is hint if you did the lookup
via Tor; otherwise you'll think you're the exit node's IP address.
o Minor bugfixes, performance:
- Two small performance improvements on parsing descriptors.
- Major performance improvement on inserting descriptors: change
algorithm from O(n^2) to O(n).
- Make the common memory allocation path faster on machines where
malloc(0) returns a pointer.
- Start remembering X-Your-Address-Is directory hints even if you're
a client, so you can become a server more smoothly.
- Avoid duplicate entries on MyFamily line in server descriptor.
o Packaging, features:
- Remove architecture from OS X builds. The official builds are
now universal binaries.
- The Debian package now uses --verify-config when (re)starting,
to distinguish configuration errors from other errors.
- Update RPMs to require libevent 1.1b.
o Packaging, bugfixes:
- Patches so Tor builds with MinGW on Windows.
- Patches so Tor might run on Cygwin again.
- Resume building on non-gcc compilers and ancient gcc. Resume
building with the -O0 compile flag. Resume building cleanly on
Debian woody.
- Run correctly on OS X platforms with case-sensitive filesystems.
- Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
- Add autoconf checks so Tor can build on Solaris x86 again.
o Documentation
- Documented (and renamed) ServerDNSSearchDomains and
ServerDNSResolvConfFile options.
- Be clearer that the *ListenAddress directives can be repeated
multiple times.
Changes in version 0.1.1.24 - 2006-09-29
o Major bugfixes:
- Allow really slow clients to not hang up five minutes into their
directory downloads (suggested by Adam J. Richter).
- Fix major performance regression from 0.1.0.x: instead of checking
whether we have enough directory information every time we want to
do something, only check when the directory information has changed.
This should improve client CPU usage by 25-50%.
- Don't crash if, after a server has been running for a while,
it can't resolve its hostname.
o Minor bugfixes:
- Allow Tor to start when RunAsDaemon is set but no logs are set.
- Don't crash when the controller receives a third argument to an
"extendcircuit" request.
- Controller protocol fixes: fix encoding in "getinfo addr-mappings"
response; fix error code when "getinfo dir/status/" fails.
- Fix configure.in to not produce broken configure files with
more recent versions of autoconf. Thanks to Clint for his auto*
voodoo.
- Fix security bug on NetBSD that could allow someone to force
uninitialized RAM to be sent to a server's DNS resolver. This
only affects NetBSD and other platforms that do not bounds-check
tolower().
- Warn user when using libevent 1.1a or earlier with win32 or kqueue
methods: these are known to be buggy.
- If we're a directory mirror and we ask for "all" network status
documents, we would discard status documents from authorities
we don't recognize.
Changes in version 0.1.2.1-alpha - 2006-08-27
o Major features:
- Add "eventdns" async dns library from Adam Langley, tweaked to
build on OSX and Windows. Only enabled if you pass the
--enable-eventdns argument to configure.
- Allow servers with no hostname or IP address to learn their
IP address by asking the directory authorities. This code only
kicks in when you would normally have exited with a "no address"
error. Nothing's authenticated, so use with care.
- Rather than waiting a fixed amount of time between retrying
application connections, we wait only 5 seconds for the first,
10 seconds for the second, and 15 seconds for each retry after
that. Hopefully this will improve the expected user experience.
- Patch from Tup to add support for transparent AP connections:
this basically bundles the functionality of trans-proxy-tor
into the Tor mainline. Now hosts with compliant pf/netfilter
implementations can redirect TCP connections straight to Tor
without diverting through SOCKS. Needs docs.
- Busy directory servers save lots of memory by spooling server
descriptors, v1 directories, and v2 networkstatus docs to buffers
as needed rather than en masse. Also mmap the cached-routers
files, so we don't need to keep the whole thing in memory too.
- Automatically avoid picking more than one node from the same
/16 network when constructing a circuit.
- Revise and clean up the torrc.sample that we ship with; add
a section for BandwidthRate and BandwidthBurst.
o Minor features:
- Split circuit_t into origin_circuit_t and or_circuit_t, and
split connection_t into edge, or, dir, control, and base structs.
These will save quite a bit of memory on busy servers, and they'll
also help us track down bugs in the code and bugs in the spec.
- Experimentally re-enable kqueue on OSX when using libevent 1.1b
or later. Log when we are doing this, so we can diagnose it when
it fails. (Also, recommend libevent 1.1b for kqueue and
win32 methods; deprecate libevent 1.0b harder; make libevent
recommendation system saner.)
- Start being able to build universal binaries on OS X (thanks
to Phobos).
- Export the default exit policy via the control port, so controllers
don't need to guess what it is / will be later.
- Add a man page entry for ProtocolWarnings.
- Add TestVia config option to the man page.
- Remove even more protocol-related warnings from Tor server logs,
such as bad TLS handshakes and malformed begin cells.
- Stop fetching descriptors if you're not a dir mirror and you
haven't tried to establish any circuits lately. [This currently
causes some dangerous behavior, because when you start up again
you'll use your ancient server descriptors.]
- New DirPort behavior: if you have your dirport set, you download
descriptors aggressively like a directory mirror, whether or not
your ORPort is set.
- Get rid of the router_retry_connections notion. Now routers
no longer try to rebuild long-term connections to directory
authorities, and directory authorities no longer try to rebuild
long-term connections to all servers. We still don't hang up
connections in these two cases though -- we need to look at it
more carefully to avoid flapping, and we likely need to wait til
0.1.1.x is obsolete.
- Drop compatibility with obsolete Tors that permit create cells
to have the wrong circ_id_type.
- Re-enable per-connection rate limiting. Get rid of the "OP
bandwidth" concept. Lay groundwork for "bandwidth classes" --
separate global buckets that apply depending on what sort of conn
it is.
- Start publishing one minute or so after we find our ORPort
to be reachable. This will help reduce the number of descriptors
we have for ourselves floating around, since it's quite likely
other things (e.g. DirPort) will change during that minute too.
- Fork the v1 directory protocol into its own spec document,
and mark dir-spec.txt as the currently correct (v2) spec.
o Major bugfixes:
- When we find our DirPort to be reachable, publish a new descriptor
so we'll tell the world (reported by pnx).
- Publish a new descriptor after we hup/reload. This is important
if our config has changed such that we'll want to start advertising
our DirPort now, etc.
- Allow Tor to start when RunAsDaemon is set but no logs are set.
- When we have a state file we cannot parse, tell the user and
move it aside. Now we avoid situations where the user starts
Tor in 1904, Tor writes a state file with that timestamp in it,
the user fixes her clock, and Tor refuses to start.
- Fix configure.in to not produce broken configure files with
more recent versions of autoconf. Thanks to Clint for his auto*
voodoo.
- "tor --verify-config" now exits with -1(255) or 0 depending on
whether the config options are bad or good.
- Resolve bug 321 when using dnsworkers: append a period to every
address we resolve at the exit node, so that we do not accidentally
pick up local addresses, and so that failing searches are retried
in the resolver search domains. (This is already solved for
eventdns.) (This breaks Blossom servers for now.)
- If we are using an exit enclave and we can't connect, e.g. because
its webserver is misconfigured to not listen on localhost, then
back off and try connecting from somewhere else before we fail.
o Minor bugfixes:
- Start compiling on MinGW on Windows (patches from Mike Chiussi).
- Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
- Fix bug 314: Tor clients issued "unsafe socks" warnings even
when the IP address is mapped through MapAddress to a hostname.
- Start passing "ipv4" hints to getaddrinfo(), so servers don't do
useless IPv6 DNS resolves.
- Patch suggested by Karsten Loesing: respond to SIGNAL command
before we execute the signal, in case the signal shuts us down.
- Clean up AllowInvalidNodes man page entry.
- Claim a commonname of Tor, rather than TOR, in TLS handshakes.
- Add more asserts to track down an assert error on a windows Tor
server with connection_add being called with socket == -1.
- Handle reporting OR_CONN_EVENT_NEW events to the controller.
- Fix misleading log messages: an entry guard that is "unlisted",
as well as not known to be "down" (because we've never heard
of it), is not therefore "up".
- Remove code to special-case "-cvs" ending, since it has not
actually mattered since 0.0.9.
- Make our socks5 handling more robust to broken socks clients:
throw out everything waiting on the buffer in between socks
handshake phases, since they can't possibly (so the theory
goes) have predicted what we plan to respond to them.
Changes in version 0.1.1.23 - 2006-07-30
o Major bugfixes:
- Fast Tor servers, especially exit nodes, were triggering asserts
due to a bug in handling the list of pending DNS resolves. Some
bugs still remain here; we're hunting them.
- Entry guards could crash clients by sending unexpected input.
- More fixes on reachability testing: if you find yourself reachable,
then don't ever make any client requests (so you stop predicting
circuits), then hup or have your clock jump, then later your IP
changes, you won't think circuits are working, so you won't try to
test reachability, so you won't publish.
o Minor bugfixes:
- Avoid a crash if the controller does a resetconf firewallports
and then a setconf fascistfirewall=1.
- Avoid an integer underflow when the dir authority decides whether
a router is stable: we might wrongly label it stable, and compute
a slightly wrong median stability, when a descriptor is published
later than now.
- Fix a place where we might trigger an assert if we can't build our
own server descriptor yet.
Changes in version 0.1.1.22 - 2006-07-05
o Major bugfixes:
- Fix a big bug that was causing servers to not find themselves
reachable if they changed IP addresses. Since only 0.1.1.22+
servers can do reachability testing correctly, now we automatically
make sure to test via one of these.
- Fix to allow clients and mirrors to learn directory info from
descriptor downloads that get cut off partway through.
- Directory authorities had a bug in deciding if a newly published
descriptor was novel enough to make everybody want a copy -- a few
servers seem to be publishing new descriptors many times a minute.
o Minor bugfixes:
- Fix a rare bug that was causing some servers to complain about
"closing wedged cpuworkers" and skip some circuit create requests.
- Make the Exit flag in directory status documents actually work.
Changes in version 0.1.1.21 - 2006-06-10
o Crash and assert fixes from 0.1.1.20:
- Fix a rare crash on Tor servers that have enabled hibernation.
- Fix a seg fault on startup for Tor networks that use only one
directory authority.
- Fix an assert from a race condition that occurs on Tor servers
while exiting, where various threads are trying to log that they're
exiting, and delete the logs, at the same time.
- Make our unit tests pass again on certain obscure platforms.
o Other fixes:
- Add support for building SUSE RPM packages.
- Speed up initial bootstrapping for clients: if we are making our
first ever connection to any entry guard, then don't mark it down
right after that.
- When only one Tor server in the network is labelled as a guard,
and we've already picked him, we would cycle endlessly picking him
again, being unhappy about it, etc. Now we specifically exclude
current guards when picking a new guard.
- Servers send create cells more reliably after the TLS connection
is established: we were sometimes forgetting to send half of them
when we had more than one pending.
- If we get a create cell that asks us to extend somewhere, but the
Tor server there doesn't match the expected digest, we now send
a destroy cell back, rather than silently doing nothing.
- Make options->RedirectExit work again.
- Make cookie authentication for the controller work again.
- Stop being picky about unusual characters in the arguments to
mapaddress. It's none of our business.
- Add a new config option "TestVia" that lets you specify preferred
middle hops to use for test circuits. Perhaps this will let me
debug the reachability problems better.
o Log / documentation fixes:
- If we're a server and some peer has a broken TLS certificate, don't
log about it unless ProtocolWarnings is set, i.e., we want to hear
about protocol violations by others.
- Fix spelling of VirtualAddrNetwork in man page.
- Add a better explanation at the top of the autogenerated torrc file
about what happened to our old torrc.
Changes in version 0.1.1.20 - 2006-05-23
o Bugfixes:
- Downgrade a log severity where servers complain that they're
invalid.
- Avoid a compile warning on FreeBSD.
- Remove string size limit on NEWDESC messages; solve bug 291.
- Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
more thoroughly when we're running on windows.
Changes in version 0.1.1.19-rc - 2006-05-03
o Minor bugs:
- Regenerate our local descriptor if it's dirty and we try to use
it locally (e.g. if it changes during reachability detection).
- If we setconf our ORPort to 0, we continued to listen on the
old ORPort and receive connections.
- Avoid a second warning about machine/limits.h on Debian
GNU/kFreeBSD.
- Be willing to add our own routerinfo into the routerlist.
Now authorities will include themselves in their directories
and network-statuses.
- Stop trying to upload rendezvous descriptors to every
directory authority: only try the v1 authorities.
- Servers no longer complain when they think they're not
registered with the directory authorities. There were too many
false positives.
- Backport dist-rpm changes so rpms can be built without errors.
o Features:
- Implement an option, VirtualAddrMask, to set which addresses
get handed out in response to mapaddress requests. This works
around a bug in tsocks where 127.0.0.0/8 is never socksified.
Changes in version 0.1.1.18-rc - 2006-04-10
o Major fixes:
- Work harder to download live network-statuses from all the
directory authorities we know about. Improve the threshold
decision logic so we're more robust to edge cases.
- When fetching rendezvous descriptors, we were willing to ask
v2 authorities too, which would always return 404.
o Minor fixes:
- Stop listing down or invalid nodes in the v1 directory. This will
reduce its bulk by about 1/3, and reduce load on directory
mirrors.
- When deciding whether a router is Fast or Guard-worthy, consider
his advertised BandwidthRate and not just the BandwidthCapacity.
- No longer ship INSTALL and README files -- they are useless now.
- Force rpmbuild to behave and honor target_cpu.
- Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
- Start to include translated versions of the tor-doc-*.html
files, along with the screenshots. Still needs more work.
- Start sending back 512 and 451 errors if mapaddress fails,
rather than not sending anything back at all.
- When we fail to bind or listen on an incoming or outgoing
socket, we should close it before failing. otherwise we just
leak it. (thanks to weasel for finding.)
- Allow "getinfo dir/status/foo" to work, as long as your DirPort
is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
- Make NoPublish (even though deprecated) work again.
- Fix a minor security flaw where a versioning auth dirserver
could list a recommended version many times in a row to make
clients more convinced that it's recommended.
- Fix crash bug if there are two unregistered servers running
with the same nickname, one of them is down, and you ask for
them by nickname in your EntryNodes or ExitNodes. Also, try
to pick the one that's running rather than an arbitrary one.
- Fix an infinite loop we could hit if we go offline for too long.
- Complain when we hit WSAENOBUFS on recv() or write() too.
Perhaps this will help us hunt the bug.
- If you're not a versioning dirserver, don't put the string
"client-versions nserver-versions n" in your network-status.
- Lower the minimum required number of file descriptors to 1000,
so we can have some overhead for Valgrind on Linux, where the
default ulimit -n is 1024.
o New features:
- Add tor.dizum.com as the fifth authoritative directory server.
- Add a new config option FetchUselessDescriptors, off by default,
for when you plan to run "exitlist" on your client and you want
to know about even the non-running descriptors.
Changes in version 0.1.1.17-rc - 2006-03-28
o Major fixes:
- Clients and servers since 0.1.1.10-alpha have been expiring
connections whenever they are idle for 5 minutes and they *do*
have circuits on them. Oops. With this new version, clients will
discard their previous entry guard choices and avoid choosing
entry guards running these flawed versions.
- Fix memory leak when uncompressing concatenated zlib streams. This
was causing substantial leaks over time on Tor servers.
- The v1 directory was including servers as much as 48 hours old,
because that's how the new routerlist->routers works. Now only
include them if they're 20 hours old or less.
o Minor fixes:
- Resume building on irix64, netbsd 2.0, etc.
- On non-gcc compilers (e.g. solaris), use "-g -O" instead of
"-Wall -g -O2".
- Stop writing the "router.desc" file, ever. Nothing uses it anymore,
and it is confusing some users.
- Mirrors stop caching the v1 directory so often.
- Make the max number of old descriptors that a cache will hold
rise with the number of directory authorities, so we can scale.
- Change our win32 uname() hack to be more forgiving about what
win32 versions it thinks it's found.
o New features:
- Add lefkada.eecs.harvard.edu as a fourth authoritative directory
server.
- When the controller's *setconf commands fail, collect an error
message in a string and hand it back to the controller.
- Make the v2 dir's "Fast" flag based on relative capacity, just
like "Stable" is based on median uptime. Name everything in the
top 7/8 Fast, and only the top 1/2 gets to be a Guard.
- Log server fingerprint on startup, so new server operators don't
have to go hunting around their filesystem for it.
- Return a robots.txt on our dirport to discourage google indexing.
- Let the controller ask for GETINFO dir/status/foo so it can ask
directly rather than connecting to the dir port. Only works when
dirport is set for now.
o New config options rather than constants in the code:
- SocksTimeout: How long do we let a socks connection wait
unattached before we fail it?
- CircuitBuildTimeout: Cull non-open circuits that were born
at least this many seconds ago.
- CircuitIdleTimeout: Cull open clean circuits that were born
at least this many seconds ago.
Changes in version 0.1.1.16-rc - 2006-03-18
o Bugfixes on 0.1.1.15-rc:
- Fix assert when the controller asks to attachstream a connect-wait
or resolve-wait stream.
- Now do address rewriting when the controller asks us to attach
to a particular circuit too. This will let Blossom specify
"moria2.exit" without having to learn what moria2's IP address is.
- Make the "tor --verify-config" command-line work again, so people
can automatically check if their torrc will parse.
- Authoritative dirservers no longer require an open connection from
a server to consider him "reachable". We need this change because
when we add new auth dirservers, old servers won't know not to
hang up on them.
- Let Tor build on Sun CC again.
- Fix an off-by-one buffer size in dirserv.c that magically never
hit our three authorities but broke sjmurdoch's own tor network.
- If we as a directory mirror don't know of any v1 directory
authorities, then don't try to cache any v1 directories.
- Stop warning about unknown servers in our family when they are
given as hex digests.
- Stop complaining as quickly to the server operator that he
hasn't registered his nickname/key binding.
- Various cleanups so we can add new V2 Auth Dirservers.
- Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
reflect the updated flags in our v2 dir protocol.
- Resume allowing non-printable characters for exit streams (both
for connecting and for resolving). Now we tolerate applications
that don't follow the RFCs. But continue to block malformed names
at the socks side.
o Bugfixes on 0.1.0.x:
- Fix assert bug in close_logs(): when we close and delete logs,
remove them all from the global "logfiles" list.
- Fix minor integer overflow in calculating when we expect to use up
our bandwidth allocation before hibernating.
- Fix a couple of bugs in OpenSSL detection. Also, deal better when
there are multiple SSLs installed with different versions.
- When we try to be a server and Address is not explicitly set and
our hostname resolves to a private IP address, try to use an
interface address if it has a public address. Now Windows machines
that think of themselves as localhost can work by default.
o New features:
- Let the controller ask for GETINFO dir/server/foo so it can ask
directly rather than connecting to the dir port.
- Let the controller tell us about certain router descriptors
that it doesn't want Tor to use in circuits. Implement
SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
- New config option SafeSocks to reject all application connections
using unsafe socks protocols. Defaults to off.
Changes in version 0.1.1.15-rc - 2006-03-11
o Bugfixes and cleanups:
- When we're printing strings from the network, don't try to print
non-printable characters. This protects us against shell escape
sequence exploits, and also against attacks to fool humans into
misreading their logs.
- Fix a bug where Tor would fail to establish any connections if you
left it off for 24 hours and then started it: we were happy with
the obsolete network statuses, but they all referred to router
descriptors that were too old to fetch, so we ended up with no
valid router descriptors.
- Fix a seg fault in the controller's "getinfo orconn-status"
command while listing status on incoming handshaking connections.
Introduce a status name "NEW" for these connections.
- If we get a linelist or linelist_s config option from the torrc
(e.g. ExitPolicy) and it has no value, warn and skip rather than
silently resetting it to its default.
- Don't abandon entry guards until they've been down or gone for
a whole month.
- Cleaner and quieter log messages.
o New features:
- New controller signal NEWNYM that makes new application requests
use clean circuits.
- Add a new circuit purpose 'controller' to let the controller ask
for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
controller command to let you specify the purpose if you're
starting a new circuit. Add a new SETCIRCUITPURPOSE controller
command to let you change a circuit's purpose after it's been
created.
- Accept "private:*" in routerdesc exit policies; not generated yet
because older Tors do not understand it.
- Add BSD-style contributed startup script "rc.subr" from Peter
Thoenen.
Changes in version 0.1.1.14-alpha - 2006-02-20
o Bugfixes on 0.1.1.x:
- Don't die if we ask for a stdout or stderr log (even implicitly)
and we're set to RunAsDaemon -- just warn.
- We still had a few bugs in the OR connection rotation code that
caused directory servers to slowly aggregate connections to other
fast Tor servers. This time for sure!
- Make log entries on Win32 include the name of the function again.
- We were treating a pair of exit policies if they were equal even
if one said accept and the other said reject -- causing us to
not always publish a new descriptor since we thought nothing
had changed.
- Retry pending server downloads as well as pending networkstatus
downloads when we unexpectedly get a socks request.
- We were ignoring the IS_FAST flag in the directory status,
meaning we were willing to pick trivial-bandwidth nodes for "fast"
connections.
- If the controller's SAVECONF command fails (e.g. due to file
permissions), let the controller know that it failed.
o Features:
- If we're trying to be a Tor server and running Windows 95/98/ME
as a server, explain that we'll likely crash.
- When we're a server, a client asks for an old-style directory,
and our write bucket is empty, don't give it to him. This way
small servers can continue to serve the directory *sometimes*,
without getting overloaded.
- Compress exit policies even more -- look for duplicate lines
and remove them.
- Clients now honor the "guard" flag in the router status when
picking entry guards, rather than looking at is_fast or is_stable.
- Retain unrecognized lines in $DATADIR/state file, so that we can
be forward-compatible.
- Generate 18.0.0.0/8 address policy format in descs when we can;
warn when the mask is not reducible to a bit-prefix.
- Let the user set ControlListenAddress in the torrc. This can be
dangerous, but there are some cases (like a secured LAN) where it
makes sense.
- Split ReachableAddresses into ReachableDirAddresses and
ReachableORAddresses, so we can restrict Dir conns to port 80
and OR conns to port 443.
- Now we can target arch and OS in rpm builds (contributed by
Phobos). Also make the resulting dist-rpm filename match the
target arch.
- New config options to help controllers: FetchServerDescriptors
and FetchHidServDescriptors for whether to fetch server
info and hidserv info or let the controller do it, and
PublishServerDescriptor and PublishHidServDescriptors.
- Also let the controller set the __AllDirActionsPrivate config
option if you want all directory fetches/publishes to happen via
Tor (it assumes your controller bootstraps your circuits).
Changes in version 0.1.0.17 - 2006-02-17
o Crash bugfixes on 0.1.0.x:
- When servers with a non-zero DirPort came out of hibernation,
sometimes they would trigger an assert.
o Other important bugfixes:
- On platforms that don't have getrlimit (like Windows), we were
artificially constraining ourselves to a max of 1024
connections. Now just assume that we can handle as many as 15000
connections. Hopefully this won't cause other problems.
o Backported features:
- When we're a server, a client asks for an old-style directory,
and our write bucket is empty, don't give it to him. This way
small servers can continue to serve the directory *sometimes*,
without getting overloaded.
- Whenever you get a 503 in response to a directory fetch, try
once more. This will become important once servers start sending
503's whenever they feel busy.
- Fetch a new directory every 120 minutes, not every 40 minutes.
Now that we have hundreds of thousands of users running the old
directory algorithm, it's starting to hurt a lot.
- Bump up the period for forcing a hidden service descriptor upload
from 20 minutes to 1 hour.
Changes in version 0.1.1.13-alpha - 2006-02-09
o Crashes in 0.1.1.x:
- When you tried to setconf ORPort via the controller, Tor would
crash. So people using TorCP to become a server were sad.
- Solve (I hope) the stack-smashing bug that we were seeing on fast
servers. The problem appears to be something do with OpenSSL's
random number generation, or how we call it, or something. Let me
know if the crashes continue.
- Turn crypto hardware acceleration off by default, until we find
somebody smart who can test it for us. (It appears to produce
seg faults in at least some cases.)
- Fix a rare assert error when we've tried all intro points for
a hidden service and we try fetching the service descriptor again:
"Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"
o Major fixes:
- Fix a major load balance bug: we were round-robining in 16 KB
chunks, and servers with bandwidthrate of 20 KB, while downloading
a 600 KB directory, would starve their other connections. Now we
try to be a bit more fair.
- Dir authorities and mirrors were never expiring the newest
descriptor for each server, causing memory and directory bloat.
- Fix memory-bloating and connection-bloating bug on servers: We
were never closing any connection that had ever had a circuit on
it, because we were checking conn->n_circuits == 0, yet we had a
bug that let it go negative.
- Make Tor work using squid as your http proxy again -- squid
returns an error if you ask for a URL that's too long, and it uses
a really generic error message. Plus, many people are behind a
transparent squid so they don't even realize it.
- On platforms that don't have getrlimit (like Windows), we were
artificially constraining ourselves to a max of 1024
connections. Now just assume that we can handle as many as 15000
connections. Hopefully this won't cause other problems.
- Add a new config option ExitPolicyRejectPrivate which defaults to
1. This means all exit policies will begin with rejecting private
addresses, unless the server operator explicitly turns it off.
o Major features:
- Clients no longer download descriptors for non-running
descriptors.
- Before we add new directory authorities, we should make it
clear that only v1 authorities should receive/publish hidden
service descriptors.
o Minor features:
- As soon as we've fetched some more directory info, immediately
try to download more server descriptors. This way we don't have
a 10 second pause during initial bootstrapping.
- Remove even more loud log messages that the server operator can't
do anything about.
- When we're running an obsolete or un-recommended version, make
the log message more clear about what the problem is and what
versions *are* still recommended.
- Provide a more useful warn message when our onion queue gets full:
the CPU is too slow or the exit policy is too liberal.
- Don't warn when we receive a 503 from a dirserver/cache -- this
will pave the way for them being able to refuse if they're busy.
- When we fail to bind a listener, try to provide a more useful
log message: e.g., "Is Tor already running?"
- Adjust tor-spec to parameterize cell and key lengths. Now Ian
Goldberg can prove things about our handshake protocol more
easily.
- MaxConn has been obsolete for a while now. Document the ConnLimit
config option, which is a *minimum* number of file descriptors
that must be available else Tor refuses to start.
- Apply Matt Ghali's --with-syslog-facility patch to ./configure
if you log to syslog and want something other than LOG_DAEMON.
- Make dirservers generate a separate "guard" flag to mean,
"would make a good entry guard". Make clients parse it and vote
on it. Not used by clients yet.
- Implement --with-libevent-dir option to ./configure. Also, improve
search techniques to find libevent, and use those for openssl too.
- Bump the default bandwidthrate to 3 MB, and burst to 6 MB
- Only start testing reachability once we've established a
circuit. This will make startup on dirservers less noisy.
- Don't try to upload hidden service descriptors until we have
established a circuit.
- Fix the controller's "attachstream 0" command to treat conn like
it just connected, doing address remapping, handling .exit and
.onion idioms, and so on. Now we're more uniform in making sure
that the controller hears about new and closing connections.
Changes in version 0.1.1.12-alpha - 2006-01-11
o Bugfixes on 0.1.1.x:
- The fix to close duplicate server connections was closing all
Tor client connections if they didn't establish a circuit
quickly enough. Oops.
- Fix minor memory issue (double-free) that happened on exit.
o Bugfixes on 0.1.0.x:
- Tor didn't warn when it failed to open a log file.
Changes in version 0.1.1.11-alpha - 2006-01-10
o Crashes in 0.1.1.x:
- Include all the assert/crash fixes from 0.1.0.16.
- If you start Tor and then quit very quickly, there were some
races that tried to free things that weren't allocated yet.
- Fix a rare memory stomp if you're running hidden services.
- Fix segfault when specifying DirServer in config without nickname.
- Fix a seg fault when you finish connecting to a server but at
that moment you dump his server descriptor.
- Extendcircuit and Attachstream controller commands would
assert/crash if you don't give them enough arguments.
- Fix an assert error when we're out of space in the connection_list
and we try to post a hidden service descriptor (reported by weasel).
- If you specify a relative torrc path and you set RunAsDaemon in
your torrc, then it chdir()'s to the new directory. If you HUP,
it tries to load the new torrc location, fails, and exits.
The fix: no longer allow a relative path to torrc using -f.
o Major features:
- Implement "entry guards": automatically choose a handful of entry
nodes and stick with them for all circuits. Only pick new guards
when the ones you have are unsuitable, and if the old guards
become suitable again, switch back. This will increase security
dramatically against certain end-point attacks. The EntryNodes
config option now provides some hints about which entry guards you
want to use most; and StrictEntryNodes means to only use those.
- New directory logic: download by descriptor digest, not by
fingerprint. Caches try to download all listed digests from
authorities; clients try to download "best" digests from caches.
This avoids partitioning and isolating attacks better.
- Make the "stable" router flag in network-status be the median of
the uptimes of running valid servers, and make clients pay
attention to the network-status flags. Thus the cutoff adapts
to the stability of the network as a whole, making IRC, IM, etc
connections more reliable.
o Major fixes:
- Tor servers with dynamic IP addresses were needing to wait 18
hours before they could start doing reachability testing using
the new IP address and ports. This is because they were using
the internal descriptor to learn what to test, yet they were only
rebuilding the descriptor once they decided they were reachable.
- Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
to download certain server descriptors, throw them away, and then
fetch them again after 30 minutes. Now mirrors throw away these
server descriptors so clients can't get them.
- We were leaving duplicate connections to other ORs open for a week,
rather than closing them once we detect a duplicate. This only
really affected authdirservers, but it affected them a lot.
- Spread the authdirservers' reachability testing over the entire
testing interval, so we don't try to do 500 TLS's at once every
20 minutes.
o Minor fixes:
- If the network is down, and we try to connect to a conn because
we have a circuit in mind, and we timeout (30 seconds) because the
network never answers, we were expiring the circuit, but we weren't
obsoleting the connection or telling the entry_guards functions.
- Some Tor servers process billions of cells per day. These statistics
need to be uint64_t's.
- Check for integer overflows in more places, when adding elements
to smartlists. This could possibly prevent a buffer overflow
on malicious huge inputs. I don't see any, but I haven't looked
carefully.
- ReachableAddresses kept growing new "reject *:*" lines on every
setconf/reload.
- When you "setconf log" via the controller, it should remove all
logs. We were automatically adding back in a "log notice stdout".
- Newly bootstrapped Tor networks couldn't establish hidden service
circuits until they had nodes with high uptime. Be more tolerant.
- We were marking servers down when they could not answer every piece
of the directory request we sent them. This was far too harsh.
- Fix the torify (tsocks) config file to not use Tor for localhost
connections.
- Directory authorities now go to the proper authority when asking for
a networkstatus, even when they want a compressed one.
- Fix a harmless bug that was causing Tor servers to log
"Got an end because of misc error, but we're not an AP. Closing."
- Authorities were treating their own descriptor changes as cosmetic,
meaning the descriptor available in the network-status and the
descriptor that clients downloaded were different.
- The OS X installer was adding a symlink for tor_resolve but
the binary was called tor-resolve (reported by Thomas Hardly).
- Workaround a problem with some http proxies where they refuse GET
requests that specify "Content-Length: 0" (reported by Adrian).
- Fix wrong log message when you add a "HiddenServiceNodes" config
line without any HiddenServiceDir line (reported by Chris Thomas).
o Minor features:
- Write the TorVersion into the state file so we have a prayer of
keeping forward and backward compatibility.
- Revive the FascistFirewall config option rather than eliminating it:
now it's a synonym for ReachableAddresses *:80,*:443.
- Clients choose directory servers from the network status lists,
not from their internal list of router descriptors. Now they can
go to caches directly rather than needing to go to authorities
to bootstrap.
- Directory authorities ignore router descriptors that have only
cosmetic differences: do this for 0.1.0.x servers now too.
- Add a new flag to network-status indicating whether the server
can answer v2 directory requests too.
- Authdirs now stop whining so loudly about bad descriptors that
they fetch from other dirservers. So when there's a log complaint,
it's for sure from a freshly uploaded descriptor.
- Reduce memory requirements in our structs by changing the order
of fields.
- There used to be two ways to specify your listening ports in a
server descriptor: on the "router" line and with a separate "ports"
line. Remove support for the "ports" line.
- New config option "AuthDirRejectUnlisted" for auth dirservers as
a panic button: if we get flooded with unusable servers we can
revert to only listing servers in the approved-routers file.
- Auth dir servers can now mark a fingerprint as "!reject" or
"!invalid" in the approved-routers file (as its nickname), to
refuse descriptors outright or include them but marked as invalid.
- Servers store bandwidth history across restarts/crashes.
- Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
get a better idea of why their circuits failed. Not used yet.
- Directory mirrors now cache up to 16 unrecognized network-status
docs. Now we can add new authdirservers and they'll be cached too.
- When picking a random directory, prefer non-authorities if any
are known.
- New controller option "getinfo desc/all-recent" to fetch the
latest server descriptor for every router that Tor knows about.
Changes in version 0.1.0.16 - 2006-01-02
o Crash bugfixes on 0.1.0.x:
- On Windows, build with a libevent patch from "I-M Weasel" to avoid
corrupting the heap, losing FDs, or crashing when we need to resize
the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- It turns out sparc64 platforms crash on unaligned memory access
too -- so detect and avoid this.
- Handle truncated compressed data correctly (by detecting it and
giving an error).
- Fix possible-but-unlikely free(NULL) in control.c.
- When we were closing connections, there was a rare case that
stomped on memory, triggering seg faults and asserts.
- Avoid potential infinite recursion when building a descriptor. (We
don't know that it ever happened, but better to fix it anyway.)
- We were neglecting to unlink marked circuits from soon-to-close OR
connections, which caused some rare scribbling on freed memory.
- Fix a memory stomping race bug when closing the joining point of two
rendezvous circuits.
- Fix an assert in time parsing found by Steven Murdoch.
o Other bugfixes on 0.1.0.x:
- When we're doing reachability testing, provide more useful log
messages so the operator knows what to expect.
- Do not check whether DirPort is reachable when we are suppressing
advertising it because of hibernation.
- When building with -static or on Solaris, we sometimes needed -ldl.
- When we're deciding whether a stream has enough circuits around
that can handle it, count the freshly dirty ones and not the ones
that are so dirty they won't be able to handle it.
- When we're expiring old circuits, we had a logic error that caused
us to close new rendezvous circuits rather than old ones.
- Give a more helpful log message when you try to change ORPort via
the controller: you should upgrade Tor if you want that to work.
- We were failing to parse Tor versions that start with "Tor ".
- Tolerate faulty streams better: when a stream fails for reason
exitpolicy, stop assuming that the router is lying about his exit
policy. When a stream fails for reason misc, allow it to retry just
as if it was resolvefailed. When a stream has failed three times,
reset its failure count so we can try again and get all three tries.
Changes in version 0.1.1.10-alpha - 2005-12-11
o Correctness bugfixes on 0.1.0.x:
- On Windows, build with a libevent patch from "I-M Weasel" to avoid
corrupting the heap, losing FDs, or crashing when we need to resize
the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- Stop doing the complex voodoo overkill checking for insecure
Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
- When we were closing connections, there was a rare case that
stomped on memory, triggering seg faults and asserts.
- We were neglecting to unlink marked circuits from soon-to-close OR
connections, which caused some rare scribbling on freed memory.
- When we're deciding whether a stream has enough circuits around
that can handle it, count the freshly dirty ones and not the ones
that are so dirty they won't be able to handle it.
- Recover better from TCP connections to Tor servers that are
broken but don't tell you (it happens!); and rotate TLS
connections once a week.
- When we're expiring old circuits, we had a logic error that caused
us to close new rendezvous circuits rather than old ones.
- Fix a scary-looking but apparently harmless bug where circuits
would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
servers, and never switch to state CIRCUIT_STATE_OPEN.
- When building with -static or on Solaris, we sometimes needed to
build with -ldl.
- Give a useful message when people run Tor as the wrong user,
rather than telling them to start chowning random directories.
- We were failing to inform the controller about new .onion streams.
o Security bugfixes on 0.1.0.x:
- Refuse server descriptors if the fingerprint line doesn't match
the included identity key. Tor doesn't care, but other apps (and
humans) might actually be trusting the fingerprint line.
- We used to kill the circuit when we receive a relay command we
don't recognize. Now we just drop it.
- Start obeying our firewall options more rigorously:
. If we can't get to a dirserver directly, try going via Tor.
. Don't ever try to connect (as a client) to a place our
firewall options forbid.
. If we specify a proxy and also firewall options, obey the
firewall options even when we're using the proxy: some proxies
can only proxy to certain destinations.
- Fix a bug found by Lasse Overlier: when we were making internal
circuits (intended to be cannibalized later for rendezvous and
introduction circuits), we were picking them so that they had
useful exit nodes. There was no need for this, and it actually
aids some statistical attacks.
- Start treating internal circuits and exit circuits separately.
It's important to keep them separate because internal circuits
have their last hops picked like middle hops, rather than like
exit hops. So exiting on them will break the user's expectations.
o Bugfixes on 0.1.1.x:
- Take out the mis-feature where we tried to detect IP address
flapping for people with DynDNS, and chose not to upload a new
server descriptor sometimes.
- Try to be compatible with OpenSSL 0.9.6 again.
- Log fix: when the controller is logging about .onion addresses,
sometimes it didn't include the ".onion" part of the address.
- Don't try to modify options->DirServers internally -- if the
user didn't specify any, just add the default ones directly to
the trusted dirserver list. This fixes a bug where people running
controllers would use SETCONF on some totally unrelated config
option, and Tor would start yelling at them about changing their
DirServer lines.
- Let the controller's redirectstream command specify a port, in
case the controller wants to change that too.
- When we requested a pile of server descriptors, we sometimes
accidentally launched a duplicate request for the first one.
- Bugfix for trackhostexits: write down the fingerprint of the
chosen exit, not its nickname, because the chosen exit might not
be verified.
- When parsing foo.exit, if foo is unknown, and we are leaving
circuits unattached, set the chosen_exit field and leave the
address empty. This matters because controllers got confused
otherwise.
- Directory authorities no longer try to download server
descriptors that they know they will reject.
o Features and updates:
- Replace balanced trees with hash tables: this should make stuff
significantly faster.
- Resume using the AES counter-mode implementation that we ship,
rather than OpenSSL's. Ours is significantly faster.
- Many other CPU and memory improvements.
- Add a new config option FastFirstHopPK (on by default) so clients
do a trivial crypto handshake for their first hop, since TLS has
already taken care of confidentiality and authentication.
- Add a new config option TestSocks so people can see if their
applications are using socks4, socks4a, socks5-with-ip, or
socks5-with-hostname. This way they don't have to keep mucking
with tcpdump and wondering if something got cached somewhere.
- Warn when listening on a public address for socks. I suspect a
lot of people are setting themselves up as open socks proxies,
and they have no idea that jerks on the Internet are using them,
since they simply proxy the traffic into the Tor network.
- Add "private:*" as an alias in configuration for policies. Now
you can simplify your exit policy rather than needing to list
every single internal or nonroutable network space.
- Add a new controller event type that allows controllers to get
all server descriptors that were uploaded to a router in its role
as authoritative dirserver.
- Start shipping socks-extensions.txt, tor-doc-unix.html,
tor-doc-server.html, and stylesheet.css in the tarball.
- Stop shipping tor-doc.html in the tarball.
Changes in version 0.1.1.9-alpha - 2005-11-15
o Usability improvements:
- Start calling it FooListenAddress rather than FooBindAddress,
since few of our users know what it means to bind an address
or port.
- Reduce clutter in server logs. We're going to try to make
them actually usable now. New config option ProtocolWarnings that
lets you hear about how _other Tors_ are breaking the protocol. Off
by default.
- Divide log messages into logging domains. Once we put some sort
of interface on this, it will let people looking at more verbose
log levels specify the topics they want to hear more about.
- Make directory servers return better http 404 error messages
instead of a generic "Servers unavailable".
- Check for even more Windows version flags when writing the platform
string in server descriptors, and note any we don't recognize.
- Clean up more of the OpenSSL memory when exiting, so we can detect
memory leaks better.
- Make directory authorities be non-versioning, non-naming by
default. Now we can add new directory servers without requiring
their operators to pay close attention.
- When logging via syslog, include the pid whenever we provide
a log entry. Suggested by Todd Fries.
o Performance improvements:
- Directory servers now silently throw away new descriptors that
haven't changed much if the timestamps are similar. We do this to
tolerate older Tor servers that upload a new descriptor every 15
minutes. (It seemed like a good idea at the time.)
- Inline bottleneck smartlist functions; use fast versions by default.
- Add a "Map from digest to void*" abstraction digestmap_t so we
can do less hex encoding/decoding. Use it in router_get_by_digest()
to resolve a performance bottleneck.
- Allow tor_gzip_uncompress to extract as much as possible from
truncated compressed data. Try to extract as many
descriptors as possible from truncated http responses (when
DIR_PURPOSE_FETCH_ROUTERDESC).
- Make circ->onionskin a pointer, not a static array. moria2 was using
125000 circuit_t's after it had been up for a few weeks, which
translates to 20+ megs of wasted space.
- The private half of our EDH handshake keys are now chosen out
of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
o Security improvements:
- Start making directory caches retain old routerinfos, so soon
clients can start asking by digest of descriptor rather than by
fingerprint of server.
- Add half our entropy from RAND_poll in OpenSSL. This knows how
to use egd (if present), openbsd weirdness (if present), vms/os2
weirdness (if we ever port there), and more in the future.
o Bugfixes on 0.1.0.x:
- Do round-robin writes of at most 16 kB per write. This might be
more fair on loaded Tor servers, and it might resolve our Windows
crash bug. It might also slow things down.
- Our TLS handshakes were generating a single public/private
keypair for the TLS context, rather than making a new one for
each new connections. Oops. (But we were still rotating them
periodically, so it's not so bad.)
- When we were cannibalizing a circuit with a particular exit
node in mind, we weren't checking to see if that exit node was
already present earlier in the circuit. Oops.
- When a Tor server's IP changes (e.g. from a dyndns address),
upload a new descriptor so clients will learn too.
- Really busy servers were keeping enough circuits open on stable
connections that they were wrapping around the circuit_id
space. (It's only two bytes.) This exposed a bug where we would
feel free to reuse a circuit_id even if it still exists but has
been marked for close. Try to fix this bug. Some bug remains.
- If we would close a stream early (e.g. it asks for a .exit that
we know would refuse it) but the LeaveStreamsUnattached config
option is set by the controller, then don't close it.
o Bugfixes on 0.1.1.8-alpha:
- Fix a big pile of memory leaks, some of them serious.
- Do not try to download a routerdesc if we would immediately reject
it as obsolete.
- Resume inserting a newline between all router descriptors when
generating (old style) signed directories, since our spec says
we do.
- When providing content-type application/octet-stream for
server descriptors using .z, we were leaving out the
content-encoding header. Oops. (Everything tolerated this just
fine, but that doesn't mean we need to be part of the problem.)
- Fix a potential seg fault in getconf and getinfo using version 1
of the controller protocol.
- Avoid crash: do not check whether DirPort is reachable when we
are suppressing it because of hibernation.
- Make --hash-password not crash on exit.
Changes in version 0.1.1.8-alpha - 2005-10-07
o New features (major):
- Clients don't download or use the directory anymore. Now they
download and use network-statuses from the trusted dirservers,
and fetch individual server descriptors as needed from mirrors.
See dir-spec.txt for all the gory details.
- Be more conservative about whether to advertise our DirPort.
The main change is to not advertise if we're running at capacity
and either a) we could hibernate or b) our capacity is low and
we're using a default DirPort.
- Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.
o New features (minor):
- Try to be smart about when to retry network-status and
server-descriptor fetches. Still needs some tuning.
- Stop parsing, storing, or using running-routers output (but
mirrors still cache and serve it).
- Consider a threshold of versioning dirservers (dirservers who have
an opinion about which Tor versions are still recommended) before
deciding whether to warn the user that he's obsolete.
- Dirservers can now reject/invalidate by key and IP, with the
config options "AuthDirInvalid" and "AuthDirReject". This is
useful since currently we automatically list servers as running
and usable even if we know they're jerks.
- Provide dire warnings to any users who set DirServer; move it out
of torrc.sample and into torrc.complete.
- Add MyFamily to torrc.sample in the server section.
- Add nicknames to the DirServer line, so we can refer to them
without requiring all our users to memorize their IP addresses.
- When we get an EOF or a timeout on a directory connection, note
how many bytes of serverdesc we are dropping. This will help
us determine whether it is smart to parse incomplete serverdesc
responses.
- Add a new function to "change pseudonyms" -- that is, to stop
using any currently-dirty circuits for new streams, so we don't
link new actions to old actions. Currently it's only called on
HUP (or SIGNAL RELOAD).
- On sighup, if UseHelperNodes changed to 1, use new circuits.
- Start using RAND_bytes rather than RAND_pseudo_bytes from
OpenSSL. Also, reseed our entropy every hour, not just at
startup. And entropy in 512-bit chunks, not 160-bit chunks.
o Fixes on 0.1.1.7-alpha:
- Nobody ever implemented EVENT_ADDRMAP for control protocol
version 0, so don't let version 0 controllers ask for it.
- If you requested something with too many newlines via the
v1 controller protocol, you could crash tor.
- Fix a number of memory leaks, including some pretty serious ones.
- Re-enable DirPort testing again, so Tor servers will be willing
to advertise their DirPort if it's reachable.
- On TLS handshake, only check the other router's nickname against
its expected nickname if is_named is set.
o Fixes forward-ported from 0.1.0.15:
- Don't crash when we don't have any spare file descriptors and we
try to spawn a dns or cpu worker.
- Make the numbers in read-history and write-history into uint64s,
so they don't overflow and publish negatives in the descriptor.
o Fixes on 0.1.0.x:
- For the OS X package's modified privoxy config file, comment
out the "logfile" line so we don't log everything passed
through privoxy.
- We were whining about using socks4 or socks5-with-local-lookup
even when it's an IP in the "virtual" range we designed exactly
for this case.
- We were leaking some memory every time the client changes IPs.
- Never call free() on tor_malloc()d memory. This will help us
use dmalloc to detect memory leaks.
- Check for named servers when looking them up by nickname;
warn when we'recalling a non-named server by its nickname;
don't warn twice about the same name.
- Try to list MyFamily elements by key, not by nickname, and warn
if we've not heard of the server.
- Make windows platform detection (uname equivalent) smarter.
- It turns out sparc64 doesn't like unaligned access either.
Changes in version 0.1.0.15 - 2005-09-23
o Bugfixes on 0.1.0.x:
- Reject ports 465 and 587 (spam targets) in default exit policy.
- Don't crash when we don't have any spare file descriptors and we
try to spawn a dns or cpu worker.
- Get rid of IgnoreVersion undocumented config option, and make us
only warn, never exit, when we're running an obsolete version.
- Don't try to print a null string when your server finds itself to
be unreachable and the Address config option is empty.
- Make the numbers in read-history and write-history into uint64s,
so they don't overflow and publish negatives in the descriptor.
- Fix a minor memory leak in smartlist_string_remove().
- We were only allowing ourselves to upload a server descriptor at
most every 20 minutes, even if it changed earlier than that.
- Clean up log entries that pointed to old URLs.
Changes in version 0.1.1.7-alpha - 2005-09-14
o Fixes on 0.1.1.6-alpha:
- Exit servers were crashing when people asked them to make a
connection to an address not in their exit policy.
- Looking up a non-existent stream for a v1 control connection would
cause a segfault.
- Fix a seg fault if we ask a dirserver for a descriptor by
fingerprint but he doesn't know about him.
- SETCONF was appending items to linelists, not clearing them.
- SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
out and refuse the setconf if it would fail.
- Downgrade the dirserver log messages when whining about
unreachability.
o New features:
- Add Peter Palfrader's check-tor script to tor/contrib/
It lets you easily check whether a given server (referenced by
nickname) is reachable by you.
- Numerous changes to move towards client-side v2 directories. Not
enabled yet.
o Fixes on 0.1.0.x:
- If the user gave tor an odd number of command-line arguments,
we were silently ignoring the last one. Now we complain and fail.
[This wins the oldest-bug prize -- this bug has been present since
November 2002, as released in Tor 0.0.0.]
- Do not use unaligned memory access on alpha, mips, or mipsel.
It *works*, but is very slow, so we treat them as if it doesn't.
- Retry directory requests if we fail to get an answer we like
from a given dirserver (we were retrying before, but only if
we fail to connect).
- When writing the RecommendedVersions line, sort them first.
- When the client asked for a rendezvous port that the hidden
service didn't want to provide, we were sending an IP address
back along with the end cell. Fortunately, it was zero. But stop
that anyway.
- Correct "your server is reachable" log entries to indicate that
it was self-testing that told us so.
Changes in version 0.1.1.6-alpha - 2005-09-09
o Fixes on 0.1.1.5-alpha:
- We broke fascistfirewall in 0.1.1.5-alpha. Oops.
- Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
- Fix bug with tor_memmem finding a match at the end of the string.
- Make unit tests run without segfaulting.
- Resolve some solaris x86 compile warnings.
- Handle duplicate lines in approved-routers files without warning.
- Fix bug where as soon as a server refused any requests due to his
exit policy (e.g. when we ask for localhost and he tells us that's
127.0.0.1 and he won't do it), we decided he wasn't obeying his
exit policy using him for any exits.
- Only do openssl hardware accelerator stuff if openssl version is
at least 0.9.7.
o New controller features/fixes:
- Add a "RESETCONF" command so you can set config options like
AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
a config option in the torrc with no value, then it clears it
entirely (rather than setting it to its default).
- Add a "GETINFO config-file" to tell us where torrc is.
- Avoid sending blank lines when GETINFO replies should be empty.
- Add a QUIT command for the controller (for using it manually).
- Fix a bug in SAVECONF that was adding default dirservers and
other redundant entries to the torrc file.
o Start on the new directory design:
- Generate, publish, cache, serve new network-status format.
- Publish individual descriptors (by fingerprint, by "all", and by
"tell me yours").
- Publish client and server recommended versions separately.
- Allow tor_gzip_uncompress() to handle multiple concatenated
compressed strings. Serve compressed groups of router
descriptors. The compression logic here could be more
memory-efficient.
- Distinguish v1 authorities (all currently trusted directories)
from v2 authorities (all trusted directories).
- Change DirServers config line to note which dirs are v1 authorities.
- Add configuration option "V1AuthoritativeDirectory 1" which
moria1, moria2, and tor26 should set.
- Remove option when getting directory cache to see whether they
support running-routers; they all do now. Replace it with one
to see whether caches support v2 stuff.
o New features:
- Dirservers now do their own external reachability testing of each
Tor server, and only list them as running if they've been found to
be reachable. We also send back warnings to the server's logs if
it uploads a descriptor that we already believe is unreachable.
- Implement exit enclaves: if we know an IP address for the
destination, and there's a running Tor server at that address
which allows exit to the destination, then extend the circuit to
that exit first. This provides end-to-end encryption and end-to-end
authentication. Also, if the user wants a .exit address or enclave,
use 4 hops rather than 3, and cannibalize a general circ for it
if you can.
- Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
controller. Also, rotate dns and cpu workers if the controller
changes options that will affect them; and initialize the dns
worker cache tree whether or not we start out as a server.
- Only upload a new server descriptor when options change, 18
hours have passed, uptime is reset, or bandwidth changes a lot.
- Check [X-]Forwarded-For headers in HTTP requests when generating
log messages. This lets people run dirservers (and caches) behind
Apache but still know which IP addresses are causing warnings.
o Config option changes:
- Replace (Fascist)Firewall* config options with a new
ReachableAddresses option that understands address policies.
For example, "ReachableAddresses *:80,*:443"
- Get rid of IgnoreVersion undocumented config option, and make us
only warn, never exit, when we're running an obsolete version.
- Make MonthlyAccountingStart config option truly obsolete now.
o Fixes on 0.1.0.x:
- Reject ports 465 and 587 in the default exit policy, since
people have started using them for spam too.
- It turns out we couldn't bootstrap a network since we added
reachability detection in 0.1.0.1-rc. Good thing the Tor network
has never gone down. Add an AssumeReachable config option to let
servers and dirservers bootstrap. When we're trying to build a
high-uptime or high-bandwidth circuit but there aren't enough
suitable servers, try being less picky rather than simply failing.
- Our logic to decide if the OR we connected to was the right guy
was brittle and maybe open to a mitm for unverified routers.
- We weren't cannibalizing circuits correctly for
CIRCUIT_PURPOSE_C_ESTABLISH_REND and
CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
build those from scratch. This should make hidden services faster.
- Predict required circuits better, with an eye toward making hidden
services faster on the service end.
- Retry streams if the exit node sends back a 'misc' failure. This
should result in fewer random failures. Also, after failing
from resolve failed or misc, reset the num failures, so we give
it a fair shake next time we try.
- Clean up the rendezvous warn log msgs, and downgrade some to info.
- Reduce severity on logs about dns worker spawning and culling.
- When we're shutting down and we do something like try to post a
server descriptor or rendezvous descriptor, don't complain that
we seem to be unreachable. Of course we are, we're shutting down.
- Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
We don't use them yet, but maybe one day our DNS resolver will be
able to discover them.
- Make ContactInfo mandatory for authoritative directory servers.
- Require server descriptors to list IPv4 addresses -- hostnames
are no longer allowed. This also fixes some potential security
problems with people providing hostnames as their address and then
preferentially resolving them to partition users.
- Change log line for unreachability to explicitly suggest /etc/hosts
as the culprit. Also make it clearer what IP address and ports we're
testing for reachability.
- Put quotes around user-supplied strings when logging so users are
more likely to realize if they add bad characters (like quotes)
to the torrc.
- Let auth dir servers start without specifying an Address config
option.
- Make unit tests (and other invocations that aren't the real Tor)
run without launching listeners, creating subdirectories, and so on.
Changes in version 0.1.1.5-alpha - 2005-08-08
o Bugfixes included in 0.1.0.14.
o Bugfixes on 0.1.0.x:
- If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
it would silently using ignore the 6668.
Changes in version 0.1.0.14 - 2005-08-08
o Bugfixes on 0.1.0.x:
- Fix the other half of the bug with crypto handshakes
(CVE-2005-2643).
- Fix an assert trigger if you send a 'signal term' via the
controller when it's listening for 'event info' messages.