[tor-bugs] #13202 [Tor]: Figure out a way to deal with bridges missing arguments.

[Tor Bug Tracker & Wiki]

#13202: Figure out a way to deal with bridges missing arguments.
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 Reporter:  yawning  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:
Component:  Tor      |        Version:  Tor: unspecified
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
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 From IRC, apparently approximately one in seven ScrambleSuit bridges do
 not have a password on the bridge line.

 I am 99% certain this is due to people running ScrambleSuit on
 tor-0.2.4.x, as passing pluggable transport arguments via the extrainfo
 document is not supported in that version, and
 `transports.c:parse_smethod_line()` does not sufficiently validate the
 `SMETHOD` line, so the arguments are silently dropped.

 This leads to Bridges that publish extrainfo documents containing Bridge
 lines that are totally useless (No ScrambleSuit password etc), and will
 never get used.

 This may be something that has to be worked around on the BridgeDB side
 (teach it about transports that require arguments, ignore bridges with
 malformed bridge lines), but that seems suboptimal (people thinking they
 are contributing bridges, when they realistically are not).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13202>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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