Re: [Lynx-dev] ..on SOCKS5 support

[Steffen Nurpmeso]

Hello Thomas Dickey.

Thomas Dickey wrote in <20190907195941.c2gqjhnuj2pp44az@prl-debianold-64\
.jexium-island.net>:
 |On Sat, Sep 07, 2019 at 08:51:26PM +0200, Steffen Nurpmeso wrote:
 |> I was forced to use lynx via SOCKS5 proxy, which i never did
 |> before.  To my surprise that did not work, it needs an additional
 |> library.  That increased the surprise, because all one needs for
 |> SOCKS5 support, even including the DNS lookup, is to hook
 |> connect(2) -- that is how i did it, as easy as [1].  And in fact
 |
 |That's changed over time - there's no standard/portable implementation
 |of socks5, and (the last time I looked...) none of the extent versions
 |corresponded to what lynx worked with long ago :-)

Well.. i do not know about the history of implementations.  What
i do know is that my implementation is for SOCKS5, which is RFC
1928 from March 1996.  It is a nice and small RFC :)

 |> i became inspired by Gaetan Bisson's usocks-06.c, which can be
 |> used via $LD_PRELOAD, and which got me going.  I will attach it.
 |> 
 |> Wouldn't it be much nicer if there would be a -socks=[HOST]:PORT
 |> command line argument and a simple, always compiled in, wrapper
 |> around connect, just the way i do it (in [1])?
 |
 |that's a thought...

It would be really nice.  When i implemented it i tested via

  $ ssh -D 10000 USER@HOST
  $ mailx -Ssocks-proxy-USER@HOST=localhost:10000

But it must be said, when using OpenSSH's -D in a session where
firefox bombs its multiple dozens of concurrent connections here
i had to restart the ssh twice already today, because of being
totally stuck.  It might be caused by the weak wireless
connectivity that i have, but i am about to ask ssh for what to
do.  (ControlMaster is in use.)

 |> Just in case i find time and the mentioned way seems interesting,
 |> is there somewhere the current development code can be loaded
 |> from?
 |> 
 |>   [1] https://git.sdaoden.eu/cgit/s-nail.git/tree/src/mx/net-socket.c#n48\
 |>   5
 |
 |I put snapshots here, as I make development changes:
 |
 | https://github.com/ThomasDickey/lynx-snapshots

Yes, i know.  (But we know this git mirror sometimes lags behind,
no, not for lynx in particular but for example vile and mawk
i track via this mirror, and just a couple of days ago you seem to
have pushed something to mawk with a six months delay.  I am not
complaining or something, and maybe it had to mature, i did not
look.  It is just that this mirror lags behind reality sometimes.)

 |but don't accept pull-requests -- see
 |
 | https://invisible-island.net/personal/git-exports.html

That i knew too already, but thanks for the link.  I am not at
github myself, so a pull request would not happen, rather a patch
for discussion here on this ML.  Note that i hate autotools, this
would be very hard.  The rest is complicated rather due to the
lynx context only.

Pretty much so it seems, but i will try.  How about
-socks5-proxy=HOST -> STRING, parsed the first time we enter
HtDoConnect() (or where in main()?), and a special my_connect() as
a replacement for the connect(2)s in there, which looks out for
the global socks5_proxy (address stored locally in the file after
initial parse was successful?), and connects through it instead of
the default.  It is pretty much a jungle here ;).  But does this
sound acceptible somehow?  Maybe i find some time next Tuesday or
Wednesday?

Ciao, and a nice Sunday i wish,

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)