Request for information on passwd

[Lakshminarayna U]

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Hi,

I am developing a password management PAM module which can be used to capture user passwords during password change. This PAM module can be installed on Linux, Solaris and HP-UX platforms.
I am facing a problem while capturing passwords of NIS+ users on Solaris/HP-UX platforms. If I use "passwd -r" command then the password of NIS+ user gets changed but it looks like doesn't use PAM framework and my PAM module not at all getting called. 
Could any of you provide me any pointers on how I can achieve password capture for NIS+ users. The command "passwd -r" is used for changing passwords in these environments. 

Any help is greatly appreciated. I am waiting for response.

Thanks in advance!
Lak