nihilist/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2024-11-23 20:03:31 +01:00
Code Issues Packages Projects Releases Wiki Activity

src/config/README: add documentation for geoip format.

Browse Source
This commit is contained in:
Nick Mathewson 2021-04-02 12:37:13 -04:00
parent 769d54c5d7
commit e9c950af82
1 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/config/README
View File

@ -33,3 +33,32 @@ torrc.sample.in:
most people shouldn't mess with. most people shouldn't mess with.
==============================
On the geoip format:
Our geoip files are line-oriented. Any empty line, or line starting
with a #, is ignored.
All other lines are composed of three comma-separated values:
START,END,CC. For the geoip file, START and END are IPv4 addresses
as expressed as 32-bit integers (such as 3325256709 to represent
198.51.100.5). For the geoip6 file, START and END are IPv6
addresses, with no brackets. In both cases CC is a two-character
country code.
The semantic meaning of a line START,END,CC is that all addresses
between START and END _inclusive_ should be mapped to the country code
CC.
We guarantee that all entries within these files are disjoint --
that is, there is no address that is matched by more than one
line. We also guarantee that all entries within these files are
sorted in numerically ascending order by address.
Thus, one effective search algorithm here is to perform a binary
search on all the entries in the file.
Note that there _are_ "gaps" in these databases: not every possible
address maps to a country code. In those cases, Tor reports the
country as ??.