[SNMP4J] Add a proxy before sending SNMP request to the device

[Frank Fock]

Hi Zhenyu,

I think the easiest way to realise proxy support is writing your own 
TransportMapping class. Probably you can subclass one of the
abstract implementations.

Best regards,
Frank


> On 28 Sep 2016, at 01:37, Zhenyu Zhou <zzy.cs.sxfs at gmail.com> wrote:
> 
> Hello,
> 
> I'm looking for a java library for SNMP and find SNMP4J is the leading one.
> It satisfied all my requirements (eg. multithread) except for I'd like to
> put the traffic through a proxy before the request reaches device.
> 
> The proxy is a normal HTTP proxy: the client connects to it and sends a
> CONNECT request such as "CONNECT <ip>:<port> HTTP/1.1". Then all following
> traffic within this channel will be redirected.
> 
> My question is, does anyone have any insights whether this is doable to add
> this feature to SNMP4J library (my gut feeling is doable)? I feel confused
> because I don't find where the code actively establishes a TCP connection
> with the device - the socket seems to be created at `ServerThread.run()`
> but it is server-side code (I guess it's for TRAP). So where might be the
> correct place to change the address to proxy's and establish the connection
> with proxy meanwhile? It might be somewhere that the code acts as a client
> to connect to the device for POLL.
> 
> Thanks in advance! Sorry for the kind of complex description and feel free
> to ask me to clarify anything here.
> 
> Best Regards!
> 
> Zhou, Zhenyu
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