Experiments with pyasn1 and preread control

[Michael Ströder]

Hello Andreas,

I've added your demo script to python-ldap's CVS as
Demo/pyasn1/prereadcontrol.py. I'd appreciate if you could implement the
decodeControlValue() method with pyasn1.

Ciao, Michael.

Andreas Hasenack wrote:
> I have been having fun with controls. Today I tried to use the Pre-Read
> control together with the modify+increment extension, so that
> modify+increment becomes actually useful.
> 
> I first added the encoding part to the ldap.so module, but later got a
> response from the pyasn1 mailing list and tried again in pure python.
> The result is attached. It's not complete yet, just a test.
> 
> The script uses mod_increment to increment uidNumber and gidNumber by
> one. Attached to the modify operation is the preread control, so the
> response includes the value prior to the modification.
> 
> Here is the output of two consecutive runs. Both attributes started at
> 1000 in LDAP:
> 
> $ ./preread-asn1.py
> res: (103, [], 2, [PreReadControl(1.3.6.1.1.13.1,1.3.6.1.1.13.1,'0M\x04\x1fcn=unixIdPool,dc=example,dc=com0*0\x13\x04\tgidNumber1\x06\x04\x0410000\x13\x04\tuidNumber1\x06\x04\x041000')])
> $ ./preread-asn1.py
> res: (103, [], 2, [PreReadControl(1.3.6.1.1.13.1,1.3.6.1.1.13.1,'0M\x04\x1fcn=unixIdPool,dc=example,dc=com0*0\x13\x04\tgidNumber1\x06\x04\x0410010\x13\x04\tuidNumber1\x06\x04\x041001')])
> 
> First one returns "1000", and the second one "1001" for both attributes.
> Now it's at 1002.
> 
> The decoding part will probably be more difficult... As the control
> response is a SearchResultEntry which is a bit more complex to decode.