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Avoid building exit circuits from a consensus with no exits

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Tor can now build circuits from a consensus with no exits.
But if it tries to build exit circuits, they fail and flood the logs.

The circuit types in the Exit Circuits list below will only be
built if the current consensus has exits. If it doesn't,
only the Internal Circuits will be built. (This can change
with each new consensus.)
Fixes bug #13814, causes fewer path failures due to #13817.

Exit Circuits:
    Predicted Exit Circuits
    User Traffic Circuits
    Most AP Streams
    Circuits Marked Exit
    Build Timeout Circuits (with exits)

Internal Circuits:
    Hidden Service Server Circuits
    Hidden Service Client Circuits
    Hidden Service AP Streams
    Hidden Service Intro Point Streams
    Circuits Marked Internal
    Build Timeout Circuits (with no exits)
    Other Circuits?
This commit is contained in:
teor
2014-12-26 00:31:16 +11:00
committed by Nick Mathewson
parent 55ad54e014
commit cb94f7534d
2 changed files with 94 additions and 27 deletions
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changes/bug13814-avoid-exit-paths-no-exits
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o Minor bugfixes:
- Avoid building exit circuits from a consensus with no exits
Tor can now build circuits from a consensus with no exits.
But if it tries to build exit circuits, they fail and flood the logs.
The circuit types in the Exit Circuits list below will only be
built if the current consensus has exits. If it doesn't,
only the Internal Circuits will be built. (This can change
with each new consensus.)
Fixes bug #13814, causes fewer path failures due to #13817.
Exit Circuits:
Predicted Exit Circuits
User Traffic Circuits
Most AP Streams
Circuits Marked Exit
Build Timeout Circuits (with exits)
Internal Circuits:
Hidden Service Server Circuits
Hidden Service Client Circuits
Hidden Service AP Streams
Hidden Service Intro Point Streams
Circuits Marked Internal
Build Timeout Circuits (with no exits)
Other Circuits?