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Re: SSH Tunneling implementation

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Akshay Joshi <akshay(dot)joshi(at)enterprisedb(dot)com>
Cc: Dave Page <dpage(at)pgadmin(dot)org>, Ashesh Vashi <ashesh(dot)vashi(at)enterprisedb(dot)com>, pgadmin-hackers <pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: SSH Tunneling implementation
Date: 2012-07-10 12:26:24
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgadmin-hackers
On Tue, Jul 10, 2012 at 2:19 PM, Akshay Joshi
<akshay(dot)joshi(at)enterprisedb(dot)com> wrote:
> On Tue, Jul 10, 2012 at 5:16 PM, Dave Page <dpage(at)pgadmin(dot)org> wrote:
>> On Tue, Jul 10, 2012 at 12:35 PM, Ashesh Vashi
>> <ashesh(dot)vashi(at)enterprisedb(dot)com> wrote:
>>> Why are we talking about using the external application here?
>> Because I suggested giving it some thought in case it turns out we have no
>> other option.
>>> The only problem with the current implementation - is that it does use
>>> new APIs for tunneling.
>>> We can change the implementation based on the current supplied libssh2 on
>>> most linux flavours.
>>> i.e. libssh2 - 1.2.7 or later
>>> I have asked Akshay to check - if we can modify the current
>>> implementation to use the older version of libssh2. (feasibility)
>> I've already asked him to investigate whether there is another API that
>> may be used that he may have missed. Only supporting old versions of libssh2
>> is unacceptable though - we need to support current versions, and ideally
>> older ones as well for compatibility with Ubuntu/Debian/RHEL etc.
>    I have investigated, there are two functions libssh2_session_handshake
> and libssh2_exit() which is not available in the older versions.
>    libssh2_session_handshake() is replacement function to
> libssh2_session_startup()(deprecated) which was added in the version 1.2.8
> and
>    libssh2_exist() was added in the version 1.2.5. So to provide backward
> compatibility we can perform the function check instead of configure
>    check and will add appropriate macros to build it properly.
>    Thought??Comments?

Uh, I'm not sure what you mean with "function check instead of
configure check". You mean trying to load the function at runtime,
with dlopen() and friends? I guess we could, but I don't think pgadmin
has any functionality for that today, so it's going to bring in a fair
amount of platform specific code, isn't it? But if it's not too
complicated, it seems like a good choice.

 Magnus Hagander

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