[tor-bugs] #25667 [Core Tor/Tor]: LZMA/ZSTD descriptor compression support

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#25667: LZMA/ZSTD descriptor compression support
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 Reporter:  atagar                               |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  regression? 033-must needs-analysis  |  Actual Points:
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 Replying to [comment:3 atagar]:
 > Hi Nick. Just tried requesting lzma and zstd compressed descriptors from
 all present dirauths but they all fell back to plaintext responses as
 moria1 did. Do we know if this feature is exercised anywhere in practice?

 You can test lzma against any of these relays:
 https://metrics.torproject.org/rs.html#search/radia

 Unfortunately, they don't have zstd support, because it's not in the
 Debian release they are using.
 If you ask on tor-relays, you can probably find a few operators who have
 only enabled zstd, or who have enabled both lzma and zstd.
 The relevant configure options are --enable-lzma and --enable-zstd.

 Tor also logs the supported compression methods on startup:
 `Tor %s running on %s with Libevent %s, OpenSSL %s, Zlib %s, Liblzma %s,
 and Libzstd %s.`
 https://gitweb.torproject.org/tor.git/tree/src/or/main.c#n3323

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25667#comment:6>
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