Handling set request...

[Nick Woods]

I have a class derived from MibLeaf that currently handles get requests
by overriding the get_request function to set the value variable after
performing a callback to my application code that actually returns the
correct value.  I'm not 100% sure if this is the best approach since it
does cause an extra copy of every variable that I am monitoring to
exist, but it does seem to work correctly.

What I really want to do now is provide a similar set of functionality
to handle SNMP set requests.  I noticed a set of virtual functions in
MibLeaf that seem to deal with SNMP set requests.  They are as follows:

  virtual int		commit_set_request(Request*, int);
  virtual int		prepare_set_request(Request*, int&);
  virtual int		undo_set_request(Request*, int&);
  virtual void		cleanup_set_request(Request*, int&);
  virtual boolean	value_ok(const Vbx&)	{ return TRUE; }

I was hoping that someone could tell me which functions I would need to
override and to provide a correct SNMP set operation that would handle
the request and pass the changed data to a callback function of mine.
In searching through the agent++ code I noticed the atm_mib example
overriding the prepare_set_request function and doing something with the
value.  Any explanation of exactly what the following code snippet is
doing and if there is anything else that I need to do to get this all
working would be much apprecitated.

-----------------
int atmInterfaceMyNeighborIfName::prepare_set_request(Request* req, int&
ind)
{
	int status;
	if ((status = SimMibLeaf::prepare_set_request(req, ind)) !=
	    SNMP_ERROR_SUCCESS) return status;
	Vb vb(req->get_value(ind));
	OctetStr v;
	vb.get_value(v);
	if (!(((v.len() >= 0) && (v.len() <= 255))))
		 return SNMP_ERROR_WRONG_LENGTH;
	return SNMP_ERROR_SUCCESS;
}
-------------

Thanks,

Nick Woods