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PAM_CONV(3)			   BSD Library Functions Manual 		      PAM_CONV(3)

     pam_conv -- PAM conversation system

     Pluggable Authentication Module Library (libpam, -lpam)

     #include <security/pam_appl.h>

     struct pam_message {
	     int      msg_style;
	     char    *msg;

     struct pam_response {
	     char    *resp;
	     int      resp_retcode;

     struct pam_conv {
	     int     (*conv)(int, const struct pam_message **,
		 struct pam_response **, void *);
	     void    *appdata_ptr;

     The PAM library uses an application-defined callback to communicate with the user.  This
     callback is specified by the struct pam_conv passed to pam_start() at the start of the
     transaction.  It is also possible to set or change the conversation function at any point
     during a PAM transaction by changing the value of the PAM_CONV item.

     The conversation function's first argument specifies the number of messages (up to
     PAM_NUM_MSG) to process.  The second argument is a pointer to an array of pointers to
     pam_message structures containing the actual messages.

     Each message can have one of four types, specified by the msg_style member of struct

			 Display a prompt and accept the user's response without echoing it to
			 the terminal.	This is commonly used for passwords.

     PAM_PROMPT_ECHO_ON  Display a prompt and accept the user's response, echoing it to the ter-
			 minal.  This is commonly used for login names and one-time passphrases.

     PAM_ERROR_MSG	 Display an error message.

     PAM_TEXT_INFO	 Display an informational message.

     In each case, the prompt or message to display is pointed to by the msg member of struct
     pam_message.  It can be up to PAM_MAX_MSG_SIZE characters long, including the terminating

     On success, the conversation function should allocate and fill a contiguous array of struct
     pam_response, one for each message that was passed in.  A pointer to the user's response to
     each message (or NULL in the case of informational or error messages) should be stored in
     the resp member of the corresponding struct pam_response.	Each response can be up to
     PAM_MAX_RESP_SIZE characters long, including the terminating NUL.

     The resp_retcode member of struct pam_response is unused and should be set to zero.

     The conversation function should store a pointer to this array in the location pointed to by
     its third argument.  It is the caller's responsibility to release both this array and the
     responses themselves, using free(3).  It is the conversation function's responsibility to
     ensure that it is legal to do so.

     The appdata_ptr member of struct pam_conv is passed unmodified to the conversation function
     as its fourth and final argument.

     On failure, the conversation function should release any resources it has allocated, and
     return one of the predefined PAM error codes.

     The conversation function should return one of the following values:

     [PAM_BUF_ERR]	 Memory buffer error.

     [PAM_CONV_ERR]	 Conversation failure.

     [PAM_SUCCESS]	 Success.

     [PAM_SYSTEM_ERR]	 System error.

     openpam_nullconv(3), openpam_ttyconv(3), pam(3), pam_error(3), pam_get_item(3), pam_info(3),
     pam_prompt(3), pam_set_item(3), pam_start(3)

     X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules, June 1997.

     The OpenPAM library and this manual page were developed for the FreeBSD Project by ThinkSec
     AS and Network Associates Laboratories, the Security Research Division of Network Asso-
     ciates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA
     CHATS research program.

BSD					  June 16, 2005 				      BSD
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