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Partially done        o Done        d Deferrable        D Deferred        X AbandonedItems for 0.1.2.x-rc:? - Bug: combination of things:    When we've been idle a long time, we stop fetching server    descriptors. When we then get a socks request, we build circuits    immediately using whatever descriptors we have, rather than waiting    until we've fetched correct ones.N - Test guard unreachable logic; make sure that we actually attempt to    connect to guards that we think are unreachable from time to time.    Make sure that we don't freak out when the network is down.  o weight dir requests by advertised bandwidth? with maybe a lower cutoff    than for tor traffic. perhaps also weighted by the expected size of    the response.  . Have (and document) a BEGIN_DIR relay cell that means "Connect to your    directory port."    o ImplementR   - turn the received socks addr:port into a digest for setting .exit    - be able to connect without having a server descriptor, to bootstrap.R     - handle connect-dir streams that don't have a chosen_exit_name set.      o include ORPort in DirServers lines so we can know where to connect.        list the orport as 0 if it can't handle begin_dir.        o List orports of actual dirservers..  . option to dl directory info via tor:    TunnelDirConns and PreferTunneledDirConnsR   - actually cause the directory.c functions to know about or_port      and use it when we're supposed to.    o for tunneled edge conns, stop reading to the bridge connection      when the or_conn we're writing to has a full outbuf.      o make directory bridge data not get produced when the corresponding        or_conn is full, and accept the sometimes directory data will just        never get written.  o DNS improvements    o Asynchronous DNS      X Make evdns use windows strerror equivalents.        (there don't seem to be windows equivalents for strerror on the         WSAERR* codes.)      o Make sure patches get into libevent.      o Verify that it works well on windows    o Debug and re-enable server-side reverse DNS caching  - Critical but minor bugs, backport candidates.    - support dir 503s better      o clients don't log as loudly when they receive them      o they don't count toward the 3-strikes rule        D But eventually, we give up after getting a lot of 503s.        D Delay when we get a lot of 503s, rather than punting onto the          servers that have given us 503s?        o Add a 'BadDirectory' flag to statuses.      o authorities should *never* 503 a cache, and should never 503        network status requests.      D They can 503 client descriptor requests when they feel like it.        How can they distinguish? Not implemented for now, maybe        should abandon.      - update dir-spec with what we decided for each of these  o Controller fixes    o Make REMAP stream events have a SOURCE (cache or exit), and make them      generated in every case where we get a connected or resolved cell.N - Libevent fixes    . Try to get the pthread_sigprocmask situation under control; see      coderman's or-dev post of 20-Feb-2007.  - Polishing    - Profile client and server; fix slow spots    - Address XXX012 items  . Packaging    o Switch canonical win32 compiler to mingw.    - If we haven't replaced privoxy, lock down its configuration in all      packages, as documented in tor-doc-unix.html  . Forward compatibility fixes    - Start uploading short and long descriptors; authorities should support      URLs to retrieve long descriptors, and should discard short descriptors      for now.  Later, once tools use the "long descriptor" URLs, authorities      will serve the short descriptors every time they're asked for      a descriptor.NR    - DesignN     - Implement, if we think it's smart.    o Check for any outstanding checks we do on the form or number of client      certificates that would prevent us from executing certain      blocking-resistance strategies.      o Design (proposal 106)      o ImplementN     - Hack up a client that gives out weird/no certificates, so we can        test to make sure that this doesn't cause servers to crash.For 0.1.2.x-final:NR. Write path-spec.txt  - Docs    - Tell people about OSX Uninstaller    - Quietly document NT Service options    - More prominently, we should have a recommended apps list.      - recommend gaim.      - unrecommend IE because of ftp:// bug.N   - we should add a preamble to tor-design saying it's out of date.N   . Document transport and natdport      o In man page      - In a good HOWTO.Things we'd like to do in 0.2.0.x:  - Proposals:    - 101: Voting on the Tor Directory System    - 104: Long and Short Router Descriptors    - 105: Version negotiation for the Tor protocol  - Refactoring:    - Make resolves no longer use edge_connection_t unless needed.    - Make cells get buffered on circuit, not on the or_conn.    - Move all status info out of routerinfo into local_routerstatus.  Make      "who can change what" in local_routerstatus explicit.  Make      local_routerstatus (or equivalent) subsume all places to go for "what      router is this?"    - Remove socketpair-based bridges conns, and the word "bridge".    - Generate torrc.{complete|sample}.in, tor.1.in, the HTML manual, and the      online config documentation from a single source.  - Features:    - Implement a DNS proxy    - Bridges.    - Let controller set router flags for authority to transmit, and for       client to use.    - Support relaying streams to ipv6.  - Deprecations:    - Remove v0 control protocol.Deferred from 0.1.2.x:  - Improve autoconf process to handle multiple SSL installations better.    X <nickm> "Let's try to find a way to make it run and make the version       match, but if not, let's just make it run."    X <arma> "should we detect if we have a --with-ssl-dir and try the -R       by default, if it works?"  - finish status event implementation and accompanying getinfos  - More work on AvoidDiskWrites?  - Get some kind of "meta signing key" to be used solely to sign    releases/to certify releases when signed by the right people/    to certify sign the right people's keys?  Also use this to cert the SSL    key, etc. (Proposal 103)  - per-conn write buckets  - separate config options for read vs write limiting    (It's hard to support read > write, since we need better     congestion control to avoid overfull buffers there.  So,     defer the whole thing.)P - Figure out why dll's compiled in mingw don't work right in WinXP.P - Figure out why openssl 0.9.8d "make test" fails at sha256t test.  - don't do dns hijacking tests if we're reject *:* exit policy?    (deferred until 0.1.1.x is less common)  - Directory guards  - RAM use in directory authorities.  - Memory use improvements:    - Look into pulling serverdescs off buffers as they arrive.    - Save and mmap v1 directories, and networkstatus docs; store them      zipped, not uncompressed.      - Switch cached_router_t to use mmap.      - What to do about reference counts on windows?  (On Unix, this is        easy: unlink works fine.  (Right?)  On Windows, I have doubts.  Do we        need to keep multiple files?)      - What do we do about the fact that people can't read zlib-        compressed files manually?  - Change the way we handle cells, flow-control, and bridges.    - The issue is that we package from edge connections aggressively until      we hit their package windows or the circuit package windows, even if      the buffer on the corresponding OR connection is pretty damn big.  This      sucks from a RAM usage POV.  Now, we could try to stop reading on the      edges (or just the edges connected to a local bridge) when an or_conn's      outbuf is full.  But if we're a server, and we stop reading on some      exit conns when OR conns are full, soon OR conns will contain only      traffic from other OR conns, and the exit data in question will never      get written.    - Remove socketpair-based bridges: use shared (or connected) buffers for      communication, rather than sockets.    - When relaying cells from an OR conn to an OR conn, have them wait in a      queue on the or_circuit_t object; don't move them onto the target conn      until there is space in the target conn's outbuf.  Also, only package      data from exitconns when there is space in the target conn's outbuf.      - As an added advantage, this would let us kill stalled _circuits_        when their buffers get too full, rather than killing entire OR        conns.  But we must think about anonymity implications of that.    - We'll probably want to do some kind of big refactoring of our      dataflow when we do these changes; stuff is hairy enough already,      and it will only get harrier with this stuff.  - If the client's clock is too far in the past, it will drop (or    just not try to get) descriptors, so it'll never build circuits.  - Tolerate clock skew on bridge relays.  - A more efficient dir protocol. (Proposal 101)    - Authorities should fetch the network-statuses amongst each      other, consensus them, and advertise a communal network-status.      This is not so much for safety/complexity as it is to reduce      bandwidth requirements for Alice.      - How does this interact with our goal of being able to choose        your own dir authorities? I guess we're now assuming that all        dir authorities know all the other authorities in their "group"?    - Should we also look into a "delta since last network-status      checkpoint" scheme, to reduce overhead further?    - Extend the "r" line in network-status to give a set of buckets (say,      comma-separated) for that router.      - Buckets are deterministic based on IP address.      - Then clients can choose a bucket (or set of buckets) to        download and use.  - Improvements to versioning. (Proposal 105)    - When we connect to a Tor server, it sends back a cell listing      the IP it believes it is using. Use this to block dvorak's attack.      Also, this is a fine time to say what time you think it is.      o Verify that a new cell type is okay with deployed codebase      . Specify HELLO cells      . Figure out v0 compatibility.      - Implement  - Eventdns improvements    - Have a way to query for AAAA and A records simultaneously.    - Improve request API: At the very least, add the ability to construct      a more-or-less arbitrary request and get a response.    - (Can we suppress cnames? Should we?)  - Now that we're avoiding exits when picking non-exit positions,    we need to consider how to pick nodes for internal circuits. If    we avoid exits for all positions, we skew the load balancing. If    we accept exits for all positions, we leak whether it's an internal    circuit at every step. If we accept exits only at the last hop, we    reintroduce Lasse's attacks from the Oakland paper.  - We should ship with a list of stable dir mirrors -- they're not    trusted like the authorities, but they'll provide more robustness    and diversity for bootstrapping clients.  - Simplify authority operation    - Follow weasel's proposal, crossed with mixminion dir config format  - A way to adjust router flags from the controller.    (How do we prevent the authority from clobbering them soon after?)  - a way to pick entry guards based wholly on extend_info equivalent;    a way to export extend_info equivalent.  - Better estimates in the directory of whether servers have good uptime    (high expected time to failure) or good guard qualities (high    fractional uptime).    - AKA Track uptime as %-of-time-up, as well as time-since-last-down  - Have a "Faster" status flag that means it. Fast2, Fast4, Fast8?    - spec    - implement  - Failed rend desc fetches sometimes don't get retried. True/false?  - Windows server usability    - Solve the ENOBUFS problem.      - make tor's use of openssl operate on buffers rather than sockets,        so we can make use of libevent's buffer paradigm once it has one.      - make tor's use of libevent tolerate either the socket or the        buffer paradigm; includes unifying the functions in connect.c.    - We need a getrlimit equivalent on Windows so we can reserve some      file descriptors for saving files, etc. Otherwise we'll trigger      asserts when we're out of file descriptors and crash.M   - rewrite how libevent does select() on win32 so it's not so very slow.      - Add overlapped IO  - Add an option (related to AvoidDiskWrites) to disable directory caching.  - More status event features:    - Missing events:      - DIR_REACHABLE      - BAD_DIR_RESPONSE (Unexpected directory response; maybe we're behind        a firewall.)      - BAD_PROXY (Bad http or https proxy)      - UNRECOGNIZED_ROUTER (a nickname we asked for is unavailable)      - Status events related to hibernation      - something about failing to parse our address?        from resolve_my_address() in config.c      - sketchy OS, sketchy threading      - too many onions queued: threading problems or slow CPU?    - Missing fields:      - TIMEOUT on CHECKING_REACHABILITY    - GETINFO status/client, status/server, status/general: There should be      some way to learn which status events are currently "in effect."      We should specify which these are, what format they appear in, and so      on.  - Improvements to bandwidth counting    - look into "uncounting" bytes spent on local connections, so      we can bandwidthrate but still have fast downloads.    - "bandwidth classes", for incoming vs initiated-here conns,      and to give dir conns lower priority.Minor items for 0.1.2.x as time permits:  - include bandwidth breakdown by conn->type in BW events.  - getinfo ns/name/moria2 doesn't include a "v" line, even when some    network-statuses I have show it. I suppose the fix should go in    networkstatus_getinfo_helper_single() in routerlist.c.  - Unify autoconf search code for libevent and openssl.  Make code    suggest platform-appropriate "devel" / "dev" / whatever packages    if we can link but we can't find the headers.  - Recommend polipo? Please?  - Make documentation realize that location of system configuration file    will depend on location of system defaults, and isn't always /etc/torrc.  - Review torrc.sample to make it more discursive.  o when reporting clock skew (both to logs and to controller), if it's    taken 126 seconds to read from the directory, our clock skew estimate    is 126 seconds wrong. use conn->timestamp_create or _lastwritten    for a closer estimate?  - a way to generate the website diagrams from source, so we can    translate them as utf-8 text rather than with gimp.R - add d64 and fp64 along-side d and fp so people can paste status    entries into a url. since + is a valid base64 char, only allow one    at a time. spec and then do.  - When we export something from foo.c file for testing purposes only,    make a foo_test.h file for test.c to include.  - The Debian package now uses --verify-config when (re)starting,    to distinguish configuration errors from other errors. Perhaps    the RPM and other startup scripts should too?  - add a "default.action" file to the tor/vidalia bundle so we can fix the    https thing in the default configuration:    http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#PrivoxyWeirdSSLPort  . Flesh out options_description array in src/or/config.c  o Don't let 'newnym' be triggered more often than every n seconds.  X If we try to publish as a nickname that's already claimed, should    we append a number (or increment the number) and try again? This    way people who read their logs can fix it as before, but people    who don't read their logs will still offer Tor servers.    - Fall back to unnamed; warn user; send controller event.  ("When we      notice a 'Rejected: There is already a named server with this nickname'      message... or maybe instead when we see in the networkstatuses that      somebody else is Named with the name we want: warn the user, send a      STATUS_SERVER message, and fall back to unnamed.")! - Tor should bind its ports before dropping privs, so users don't    have to do the ipchains dance.  - Rate limit exit connections to a given destination -- this helps    us play nice with websites when Tor users want to crawl them; it    also introduces DoS opportunities.  - Streamline how we pick entry nodes: Make choose_random_entry() have    less magic and less control logic.  - Christian Grothoff's attack of infinite-length circuit.    the solution is to have a separate 'extend-data' cell type    which is used for the first N data cells, and only    extend-data cells can be extend requests.    - Specify, including thought about anonymity implications.  - Display the reasons in 'destroy' and 'truncated' cells under some    circumstances?  - We need a way for the authorities to declare that nodes are    in a family.  Also, it kinda sucks that family declarations use O(N^2)    space in the descriptors.  - If the server is spewing complaints about raising your ulimit -n,    we should add a note about this to the server descriptor so other    people can notice too.  - cpu fixes:    - see if we should make use of truncate to retry    X kill dns workers more slowly  . Directory changes    . Some back-out mechanism for auto-approval      - a way of rolling back approvals to before a timestamp        - Consider minion-like fingerprint file/log combination.  - packaging and ui stuff:    . multiple sample torrc files    . figure out how to make nt service stuff work?      . Document it.    - Vet all pending installer patches      - Win32 installer plus privoxy, sockscap/freecap, etc.      - Vet win32 systray helper code  - Improve controller      - a NEWSTATUS event similar to NEWDESC.      - change circuit status events to give more details, like purpose,        whether they're internal, when they become dirty, when they become        too dirty for further circuits, etc.        - What do we want here, exactly?        - Specify and implement it.      - Change stream status events analogously.        - What do we want here, exactly?        - Specify and implement it.      - Make other events "better".      - Change stream status events analogously.        - What do we want here, exactly?        - Specify and implement it.      - Make other events "better" analogously        - What do we want here, exactly?        - Specify and implement it.      . Expose more information via getinfo:        - import and export rendezvous descriptors        - Review all static fields for additional candidates      - Allow EXTENDCIRCUIT to unknown server.      - We need some way to adjust server status, and to tell tor not to        download directories/network-status, and a way to force a download.      - Make everything work with hidden services  - Directory system improvements    - config option to publish what ports you listen on, beyond      ORPort/DirPort.  It should support ranges and bit prefixes (?) too.      - Parse this.      - Relay this in networkstatus.  - Be a DNS proxy.    - Need a way to request address lookups (and allocate a stream ID for      them) without having a corresponding client socket.      - Once this is done, it would be nice to have a way to request address        lookups from the controller without using SOCKS.    - Refactor exit/entry side of DNS resolve: we don't need a connection_t;      we can have an edge_connection_t and (say) dns_request_t both extend an      edge_stream_t, and have p_streams and n_streams both be linked lists      of edge_stream_t.Future version:  - Configuration format really wants sections.  - Good RBL substitute.  - Authorities should try using exits for http to connect to some URLS    (specified in a configuration file, so as not to make the List Of Things    Not To Censor completely obvious) and ask them for results.  Exits that    don't give good answers should have the BadExit flag set.  - Our current approach to block attempts to use Tor as a single-hop proxy    is pretty lame; we should get a better one.  . Update the hidden service stuff for the new dir approach.    - switch to an ascii format, maybe sexpr?    - authdirservers publish blobs of them.    - other authdirservers fetch these blobs.    - hidserv people have the option of not uploading their blobs.    - you can insert a blob via the controller.    - and there's some amount of backwards compatibility.    - teach clients, intro points, and hidservs about auth mechanisms.    - come up with a few more auth mechanisms.  - auth mechanisms to let hidden service midpoint and responder filter    connection requests.  - Bind to random port when making outgoing connections to Tor servers,    to reduce remote sniping attacks.  - Have new people be in limbo and need to demonstrate usefulness    before we approve them.  - Clients should estimate their skew as median of skew from servers    over last N seconds.  - Make router_is_general_exit() a bit smarter once we're sure what it's for.  - Audit everything to make sure rend and intro points are just as likely to    be us as not.  - Do something to prevent spurious EXTEND cells from making middleman    nodes connect all over.  Rate-limit failed connections, perhaps?  - Automatically determine what ports are reachable and start using    those, if circuits aren't working and it's a pattern we recognize    ("port 443 worked once and port 9001 keeps not working").  - Limit to 2 dir, 2 OR, N SOCKS connections per IP.  - Handle full buffers without totally borking  - Rate-limit OR and directory connections overall and per-IP and    maybe per subnet.  - Hold-open-until-flushed now works by accident; it should work by    design.  - DoS protection: TLS puzzles, public key ops, bandwidth exhaustion.    - Specify?  - tor-resolve script should use socks5 to get better error messages.  - hidserv offerers shouldn't need to define a SocksPort    * figure out what breaks for this, and do it.  - tor should be able to have a pool of outgoing IP addresses    that it is able to rotate through. (maybe)    - Specify; implement.  - let each hidden service (or other thing) specify its own    OutboundBindAddress?  - Stop using tor_socketpair to make connection bridges: do an    implementation that uses buffers only.Blue-sky:  - Patch privoxy and socks protocol to pass strings to the browser.  - Standby/hotswap/redundant hidden services.  - Robust decentralized storage for hidden service descriptors.  - The "China problem"  - Allow small cells and large cells on the same network?  - Cell buffering and resending. This will allow us to handle broken    circuits as long as the endpoints don't break, plus will allow    connection (tls session key) rotation.  - Implement Morphmix, so we can compare its behavior, complexity, etc.  - Other transport. HTTP, udp, rdp, airhook, etc. May have to do our own    link crypto, unless we can bully openssl into it.  - Need a relay teardown cell, separate from one-way ends.    (Pending a user who needs this)  - Handle half-open connections: right now we don't support all TCP    streams, at least according to the protocol. But we handle all that    we've seen in the wild.    (Pending a user who needs this)Non-Coding:  - Mark up spec; note unclear points about servers  - Mention controller libs someplace.  . more pictures from ren. he wants to describe the tor handshakeNR- write a spec appendix for 'being nice with tor'  - tor-in-the-media page  - Remove need for HACKING file.  - Figure out licenses for website material.  - Specify the keys and key rotation schedules and stuffWebsite:  - and remove home and make the "Tor" picture be the link to home.  - put the logo on the website, in source form, so people can put it on    stickers directly, etc.R - make a page with the hidden service diagrams.  - ask Jan to be the translation coordinator? add to volunteer page.  - add a page for localizing all tor's components.  - It would be neat if we had a single place that described _all_ the    tor-related tools you can use, and what they give you, and how well they    work.  Right now, we don't give a lot of guidance wrt    torbutton/foxproxy/privoxy/polipo in any consistent place.
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