[Samba] interface with samba from application

[Andrea Zagli]

i'm writing a windows application that authenticate on samba ldap

i would like to make users possible to change their password from this  
application

do you know some library i can interface to? or where can i find  
documentation about the protocol to communicate to samba to change  
password?

i have already watched the source code of samba, and i found some  
files that can help me inside source/libsmb: is a way forward?

thanks in advance