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Re: [tor-bugs] #12538 [Tor]: Make all relays automatically be dir caches
#12538: Make all relays automatically be dir caches
-------------------------------------------------+-------------------------
Reporter: cypherpunks | Owner:
Type: task | Status:
Priority: High | needs_review
Component: Tor | Milestone: Tor:
Severity: Normal | 0.2.8.x-final
Keywords: tor-guard, tor-relay, prop237, | Version: Tor:
026-triaged-1, sebastian-review, | unspecified
027-triaged-1-out, 028-triage, 028-triaged, | Resolution:
mike-can, pre028-patch | Actual Points:
Parent ID: | Points:
Sponsor: | medium/large
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Comment (by teor):
Replying to [comment:75 nickm]:
> Replying to [comment:74 teor]:
> > I think if an operator sets DirCache 0, caching *and* serving should
stop.
> > This is analogous with setting DirPort 0, and obeys the "principle of
least surprise".
> > Otherwise, what can an operator do to stop serving directory documents
right away?
> > (For example, what if they are close to quota for the month?)
>
> Right, I agree that DirCache 0 should always mean "don't cache."
>
> The issue I was thinking about is another part of the definition of
dir_server_mode:
> {{{
> int
> dir_server_mode(const or_options_t *options)
> {
> if (!options->DirCache)
> return 0;
> return (server_mode(options) || options->DirPort_set) &&
> router_should_be_directory_server(options, 0);
> }
> }}}
>
> This means that if `router_should_be_directory_server()` returns false,
we'll stop serving directory information, even if DirCache was set to 1
and/or we advertised a dir_port.
>
> And the `router_should_be_directory_server()` function looks not only at
the configuration, but also at the current accounting state state, which
is the part that makes me a little concerned.
There's an existing Tor feature that disables the DirPort if a relay
operator has bandwidth accounting limits enabled. This is intended to save
upload bandwidth for (symmetrical) circuit traffic, rather than (upload-
heavy) directory responses.
Are you suggesting we remove this feature, and, if so, for relays using
the new all-cache feature, or all directories?
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12538#comment:76>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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