Re: SSH Bugs

Ingela Anderton Andin <[email protected]> wrote on
07/01/2014 10:22:24 AM:

> Ingela Anderton Andin <[email protected]>
> 07/01/2014 10:22 AM
>
> To
>
> <[email protected]>,
>
> cc
>
> <[email protected]>, <[email protected]>
>
> Subject
>
> Re: [erlang-bugs] SSH Bugs
>
> Hi!
>
> On 07/01/2014 03:14 PM, [email protected] wrote:
> > Hi Angela,
>
>      ^^^^^^^^
>
>      It is a Swedish name starts with I ;)

I apologize!!!

>
> >> Ingela Anderton Andin <[email protected]>
> >> Sent by: [email protected]
> >>
> >> 07/01/2014 03:50 AM
> >>
> >> To
> >>
> >> <[email protected]>,
> >>
> >> cc
> >>
> >> Subject
> >>
> >> Re: [erlang-bugs] SSH Bugs
> >>
> >> Hi!
> >>
> >> On 06/30/2014 10:37 PM, [email protected]
wrote:
> >>>
> >>> Hi,
> >>>
> >>> Does anyone know what the final resolution was with this bug?
> >>> http://erlang.org/pipermail/erlang-patches/2013-December/004499.html
> >>
> >> Humm I can not remeber seeing this patch before! Maybe it got lost in
> >> the process some how :(
> >
> > No worries! When I didn't see it in 17.1, I thought I would check to
see if
> > that was the case.
> >
> >>
> >>
> >>> The patch given by Anton Ryabkov seems to address the immediate bug.
> > Is
> >>> this fix ok?  Or is there a better way?
> >>>
> >>> With Anton's patch I am able to get this example to run:
> >>>
> >
https://github.com/erlang/otp/blob/maint/lib/ssh/examples/ssh_sample_cli.erl

> >
> >>>
> >>> It works with Tera Term as the client, but when I try to use PuTTY I
> > get
> >>> the following error:
> >>> "Disconnected:  Server protocol violation: unexpected
> >>> SSH2_MSG_CHANNEL_SUCCESS packet"
> >>>
> >>> I believe this worked with PuTTY before R16B03.  Did an edge case get
> >>> missed with this refactor?
> >>> https://github.com/erlang/otp/commit/
> >> 68263a48bfbdac4dc219a91f06af3d535d881850
> >>
> >> Possible!
> >>
> >> Have you tried it with 17.1? I think the 17.1 code semantically seems
to
> >> be doing the same as the patch.
> >
> > I'm still having trouble with 17.1.  When I make Anton's changes,
TeraTerm
> > seems to work.
> >
> > As far as PuTTY, I assume the root cause is somewhere in
> > ssh_connection.erl:handle_cli_msg() :
> >
> > handle_cli_msg(#connection{channel_cache = Cache} = Connection,
> >           #channel{user = undefined,
> >          remote_id = RemoteId,
> >          local_id = ChannelId} = Channel0, Reply0) ->
> >
> >      case (catch start_cli(Connection, ChannelId)) of
> >    {ok, Pid} ->
> >        erlang:monitor(process, Pid),
> >        Channel = Channel0#channel{user = Pid},
> >        ssh_channel:cache_update(Cache, Channel),
> >        Reply = {connection_reply,
> >            channel_success_msg(RemoteId)},
> >        {{replies, [{channel_data, Pid, Reply0}, Reply]}, Connection};
> >    _Other ->
> >        Reply = {connection_reply,
> >            channel_failure_msg(RemoteId)},
> >        {{replies, [Reply]}, Connection}
> >      end;
> >
> > We start_cli() and send channel_success_msg().  Prior to the refactor I
> > believe this was reply_msg() instead.  If I change
> >        Reply = {connection_reply,
> >            channel_success_msg(RemoteId)},
> >        {{replies, [{channel_data, Pid, Reply0}, Reply]}, Connection};
> > To:
> >        {Reply, Connection1} = reply_msg(Channel, Connection, Reply0),
> >          {{replies, [Reply]}, Connection1};
> >
> > Then PuTTY seems happy again. Does this seem OK?  Or am I messing
something
> > else up by "fixing" this.
>
> Humm ... looks like the refactor went wrong, when I make this change
> which also conform with the next clause, the ssh test SUITE still
> passes. It would be great if you could make a pull-request and add a
> test case for this.  I will make a ticket for this issue, but it is
> vacation times now so it will take a while for someone to look into the
> ticket.

How important is adding the ssh test SUITE?  The reason I ask is that I am
running on Windows at the moment, which not the easiest thing to get OTP to
compile on.  I have been just modifying the code shipped with the release
and then recompiling :)


Thanks!
Mike

>
> Regards Ingela Erlang/OTP team - Ericsson AB
>
>
>
> ______________________________________________________________________
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