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50 lines
1.8 KiB
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50 lines
1.8 KiB
Plaintext
Filename: 185-dir-without-dirport.txt
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Title: Directory caches without DirPort
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Author: Nick Mathewson
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Created: 20-Sep-2011
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Status: Superseded
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Superseded-by: 237
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Overview:
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Exposing a directory port is no longer necessary for running as a
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directory cache. This proposal suggests that we eliminate that
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requirement, and describes how.
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Motivation:
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Now that we tunnel directory connections by default, it is no
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longer necessary to have a DirPort to be a directory cache. In
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fact, bridges act as directory caches but do not actually have a
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DirPort exposed. It would be nice and tidy to expand that
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property to the rest of the network.
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Configuration:
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Add a new torrc option, "DirCache". Its values can be "0", "1",
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and "auto". If it is 0, we never act as a directory cache, even
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if DirPort is set. If it is 1, then we act as a directory cache
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according to same rules as those used for nodes that set a
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DirPort. If it is "auto", then Tor decides whether to act as a
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directory cache based on some future intelligent algorithm. "Auto"
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should be the new default.
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Advertising cache status:
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Nodes that are running as a directory cache should set the entry
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"dir-cache 1" in their router descriptors. If they do not have a
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DirPort set, or do not have a working DirPort, they should give
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their directory port as 0 in their router lines. (Nodes that have
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a working directory port advertise it as usual, and also include a
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"dir-cache" line. Nodes that do not serve directory information
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should set their directory port to 0, and not include any
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dir-cache line. Implementations should accept and ignore
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dir-cache lines with values other than "dir-cache 1".)
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Consensus:
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Authorities should assign a "DirCache" flag to all nodes running
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as a directory cache.
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This does not require a new version of the consensus algorithm.
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