[Pidgin] #16535: less delay for xmpp file transfer using streamhosts

[Pidgin]

#16535: less delay for xmpp file transfer using streamhosts
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 Reporter:  evert_mouw                    |       Owner:
     Type:  patch                         |      Status:  new
Milestone:  Patches Needing Review        |   Component:  libpurple
  Version:  2.10.11                       |  Resolution:
 Keywords:  XMPP streamhost filetransfer  |
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Comment (by datallah):

 The current ordering isn't arbitrary, it uses the ordering specified by
 the sender (which is what is specified by
 [http://xmpp.org/extensions/xep-0065.html#direct-proto-establish
 XEP-0065]).
 At least when Pidgin is the sender (and presumably for other clients too),
 the ordering is intentional and prefers direct connections over proxies -
 see `jabber_si_xfer_bytestreams_listen_cb` in the same file.

 It's certainly true that direct connections are less likely to succeed,
 but switching the ordering will make large in-network file transfers not
 possible.

 A somewhat more complicated algorithm probably could be used to decide
 whether or not to try internal IPs (and those could likely have a much
 shorter timeout than public IPs).

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Ticket URL: <https://developer.pidgin.im/ticket/16535#comment:4>
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