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When excluding nodes by country, exclude {??} and {A1} too

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This is ticket 7706, reported by "bugcatcher."  The rationale here
is that if somebody says 'ExcludeNodes {tv}', then they probably
don't just want to block definitely Tuvaluan nodes: they also want
to block nodes that have unknown country, since for all they know
such nodes are also in Tuvalu.

This behavior is controlled by a new GeoIPExcludeUnknown autobool
option.  With the default (auto) setting, we exclude ?? and A1 if
any country is excluded.  If the option is 1, we add ?? and A1
unconditionally; if the option is 0, we never add them.

(Right now our geoip file doesn't actually seem to include A1: I'm
including it here in case it comes back.)

This feature only takes effect if you have a GeoIP file.  Otherwise
you'd be excluding every node.
This commit is contained in:
Nick Mathewson
2013-01-17 18:07:36 -05:00
parent e0581a4b57
commit ff9bdbd56f
6 changed files with 75 additions and 0 deletions
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o Minor features:
- When any country code is listed in ExcludeNodes or
ExcludeExitNodes, and we have GeoIP information, also exclude
all nodes with unknown countries ({??} and {A1} if
present). This behavior is controlled by the new
GeoIPExcludeUnknown option: you can make such nodes always
excluded with 'GeoIPExcludeUnknown 1', and disable the feature
with 'GeoIPExcludeUnknown 0'. Setting 'GeoIPExcludeUnknown auto'
gets you the default behavior. Implements feature 7706.