give the bootstrap-phases proposal a real number

svn:r15121

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-Filename: xxx-bootstrap-phases.txt
-Title: Keep controllers informed as Tor bootstraps
-Version: $Revision$
-Last-Modified: $Date$
-Author: Roger Dingledine
-Created: 07-Jun-2008
-Status: Open
-
-1. Overview.
-
-  Tor has many steps to bootstrapping directory information and
-  initial circuits, but from the controller's perspective we just have
-  a coarse-grained "CIRCUIT_ESTABLISHED" status event. Tor users with
-  slow connections or with connectivity problems can wait a long time
-  staring at the yellow onion, wondering if it will ever change color.
-
-  This proposal describes a new client status event so Tor can give
-  more details to the controller. Section 2 describes the changes to the
-  controller protocol; Section 3 describes Tor's internal bootstrapping
-  phases when everything is going correctly; Section 4 describes when
-  Tor detects a problem and issues a bootstrap warning; Section 5 covers
-  suggestions for how controllers should display the results.
-
-2. Controller event syntax.
-
-  The generic status event is:
-
-    "650" SP StatusType SP StatusSeverity SP StatusAction
-                                        [SP StatusArguments] CRLF
-
-  So in this case we send
-  650 STATUS_CLIENT NOTICE/WARN BOOTSTRAP \
-  PROGRESS=num TAG=string SUMMARY=string WARNING=string REASON=string
-
-  "Progress" gives a number between 0 and 100 for how far through
-  the bootstrapping process we are. "Summary" is a string that can be
-  displayed to the user to describe the *next* task that Tor will tackle,
-  i.e., the task it is working on after sending the status event. "Tag"
-  is an optional string that controllers can use to recognize bootstrap
-  phases from Section 3, if they want to do something smarter than just
-  blindly displaying the summary string.
-
-  The severity describes whether this is a normal bootstrap phase
-  (severity notice) or an indication of a bootstrapping problem
-  (severity warn). If severity warn, it should also include a "warning"
-  argument string with any hints Tor has to offer about why it's having
-  troubles bootstrapping, and a "reason" string that lists of the reasons
-  allowed in the ORConn event.
-
-3. The bootstrap phases.
-
-  This section describes the various phases currently reported by
-  Tor. Controllers should not assume that the percentages and tags listed
-  here will continue to match up, or even that the tags will stay in
-  the same order. Some phases might also be skipped (not reported) if the
-  associated bootstrap step is already complete.
-
-  Phase 0:
-  tag=starting summary="starting"
-
-  Tor starts out in this phase. It doesn't actually send a status event
-  to say so.
-
-  Phase 5:
-  tag=conn_dir summary="Connecting to directory mirror"
-
-  Tor sends this event as soon as Tor has chosen a directory mirror ---
-  one of the authorities if bootstrapping for the first time or after
-  a long downtime, or one of the relays listed in its cached directory
-  information otherwise.
-
-  Tor will stay at this phase until it has successfully established
-  a TCP connection with some directory mirror. Problems in this phase
-  generally happen because Tor doesn't have a network connection, or
-  because the local firewall is dropping SYN packets.
-
-  Phase 10
-  tag=handshake_dir summary="Finishing handshake with directory mirror"
-
-  This event occurs when Tor establishes a TCP connection with a relay
-  (or its https proxy if it's using one). Tor remains in this phase until
-  the TLS handshake with the relay is finished.
-
-  Problems in this phase generally happen because Tor's firewall is
-  doing more sophisticated MITM attacks on it, or doing packet-level
-  keyword recognition of Tor's handshake.
-
-  Phase 15:
-  tag=onehop_create summary="Establishing one-hop circuit for dir info"
-
-  Once TLS is finished with a relay, Tor will send a CREATE_FAST cell
-  to establish a one-hop circuit for retrieving directory information.
-  It will remain in this phase until it receives the CREATED_FAST cell
-  back, indicating that the circuit is ready.
-
-  Phase 20:
-  tag=requesting_status summary="Asking for networkstatus consensus"
-
-  Once we've finished our one-hop circuit, we will start a new stream
-  for fetching the networkstatus consensus. We'll stay in this phase
-  until we get the 'connected' relay cell back, indicating that we've
-  established a directory connection.
-
-  Phase 25:
-  tag=loading_status summary="Loading networkstatus consensus"
-
-  Once we've established a directory connection, we will start fetching
-  the networkstatus consensus document. This could take a while; this
-  phase is a good opportunity for using the "progress" keyword to indicate
-  partial progress.
-
-  This phase could stall if the directory mirror we picked doesn't
-  have a copy of the networkstatus consensus so we have to ask another,
-  or it does give us a copy but we don't find it valid.
-
-  Phase 40:
-  tag=loading_keys summary="Loading authority key certs"
-
-  Sometimes when we've finished loading the networkstatus consensus,
-  we find that we don't have all the authority key certificates for the
-  keys that signed the consensus. At that point we put the consensus we
-  fetched on hold and fetch the keys so we can verify the signatures.
-
-  Phase 45
-  tag=requesting_descriptors summary="Asking for relay descriptors"
-
-  Once we have a valid networkstatus consensus and we've checked all
-  its signatures, we start asking for relay descriptors. We stay in this
-  phase until we have received a 'connected' relay cell in response to
-  a request for descriptors.
-
-  Phase 50:
-  tag=loading_descriptors summary="Loading relay descriptors"
-
-  We will ask for relay descriptors from several different locations,
-  so this step will probably make up the bulk of the bootstrapping,
-  especially for users with slow connections. We stay in this phase until
-  we have descriptors for at least 1/4 of the usable relays listed in
-  the networkstatus consensus. This phase is also a good opportunity to
-  use the "progress" keyword to indicate partial steps.
-
-  Phase 80:
-  tag=conn_or summary="Connecting to entry guard"
-
-  Once we have a valid consensus and enough relay descriptors, we choose
-  some entry guards and start trying to build some circuits. This step
-  is similar to the "conn_dir" phase above; the only difference is
-  the context.
-
-  If a Tor starts with enough recent cached directory information,
-  its first bootstrap status event will be for the conn_or phase.
-
-  Phase 85:
-  tag=handshake_or summary="Finishing handshake with entry guard"
-
-  This phase is similar to the "handshake_dir" phase, but it gets reached
-  if we finish a TCP connection to a Tor relay and we have already reached
-  the "conn_or" phase. We'll stay in this phase until we complete a TLS
-  handshake with a Tor relay.
-
-  Phase 90:
-  tag=circuit_create "Establishing circuits"
-
-  Once we've finished our TLS handshake with an entry guard, we will
-  set about trying to make some 3-hop circuits in case we need them soon.
-
-  Phase 100:
-  tag=done summary="Done"
-
-  A full 3-hop circuit has been established. Tor is ready to handle
-  application connections now.
-
-4. Bootstrap problem events.
-
-  When an OR Conn fails, we send a "bootstrap problem" status event, which
-  is like the standard bootstrap status event except with severity warn.
-  We include the same progress, tag, and summary values as we would for
-  a normal bootstrap event, but we also include 'warning' and 'reason'
-  strings.
-
-  The reason string is the same argument as the reason string for ORCONN
-  failure events; the controller can recognize the various reasons
-  and help the user accordingly. The warning string currently tries to
-  provide the equivalent of strerror() -- this isn't very useful if the
-  controller can recognize reason tags and be smarter, but for a very
-  simple controller it should be better than nothing.
-
-  Currently Tor ignores the first nine bootstrap problem reports for
-  a given phase, reports the tenth to the controller, and then ignores
-  further problems at that phase. Hopefully this is a good balance between
-  tolerating occasional errors and reporting serious problems quickly. (We
-  will want to revisit this approach if there are many different 'reason'
-  values being reported among the first ten problem reports, since in
-  this case the controller will only hear one of them.)
-
-5. Suggested controller behavior.
-
-  Controllers should start out with a yellow onion or the equivalent
-  ("starting"), and then watch for either a bootstrap status event
-  (meaning the Tor they're using is sufficiently new to produce them,
-  and they should load up the progress bar or whatever they plan to use
-  to indicate progress) or a circuit_established status event (meaning
-  bootstrapping is finished).
-
-  In addition to a progress bar in the display, controllers should also
-  have some way to indicate progress even when no controller window is
-  open. For example, folks using Tor Browser Bundle in hostile Internet
-  cafes don't want a big splashy screen up. One way to let the user keep
-  informed of progress in a more subtle way is to change the task tray
-  icon and/or tooltip string as more bootstrap events come in.
-
-  Controllers should also have some mechanism to alert their user when
-  bootstrapping problems are reported. Perhaps we should gather a set of
-  help texts and the controller can send the user to the right anchor in a
-  "bootstrapping problems" help page?
-