.\"-
.\" Copyright (c) 2001-2003 Networks Associates Technology, Inc.
.\" Copyright (c) 2004-2007 Dag-Erling Smørgrav
.\" All rights reserved.
.\"
.\" This software was developed for the FreeBSD Project by ThinkSec AS and
.\" Network Associates Laboratories, the Security Research Division of
.\" Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
.\" ("CBOSS"), as part of the DARPA CHATS research program.
.\"
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.\"    notice, this list of conditions and the following disclaimer in the
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.\" $P4$
.\"
.Dd December 21, 2007
.Dt PAM_VPROMPT 3
.Os
.Sh NAME
.Nm pam_vprompt
.Nd call the conversation function
.Sh LIBRARY
.Lb libpam
.Sh SYNOPSIS
.In sys/types.h
.In security/pam_appl.h
.Ft "int"
.Fn pam_vprompt "const pam_handle_t *pamh" "int style" "char **resp" "const char *fmt" "va_list ap"
.Sh DESCRIPTION
The
.Nm
function constructs a string from the
.Fa fmt
and
.Fa ap
arguments using
.Xr vsnprintf 3 ,
and passes it to the given PAM context's
conversation function.
.Pp
The
.Fa style
argument specifies the type of interaction requested, and
must be one of the following:
.Bl -tag -width 18n
.It Dv PAM_PROMPT_ECHO_OFF
Display the message and obtain the user's response without
displaying it.
.It Dv PAM_PROMPT_ECHO_ON
Display the message and obtain the user's response.
.It Dv PAM_ERROR_MSG
Display the message as an error message, and do not wait
for a response.
.It Dv PAM_TEXT_INFO
Display the message as an informational message, and do
not wait for a response.
.El
.Pp
A pointer to the response, or
.Dv NULL
if the conversation function did
not return one, is stored in the location pointed to by the
.Fa resp
argument.
.Pp
The message and response should not exceed
.Dv PAM_MAX_MSG_SIZE
or
.Dv PAM_MAX_RESP_SIZE ,
respectively.
If they do, they may be truncated.
.Pp
.Sh RETURN VALUES
The
.Nm
function returns one of the following values:
.Bl -tag -width 18n
.It Bq Er PAM_BUF_ERR
Memory buffer error.
.It Bq Er PAM_CONV_ERR
Conversation failure.
.It Bq Er PAM_SYSTEM_ERR
System error.
.El
.Sh SEE ALSO
.Xr pam 3 ,
.Xr pam_error 3 ,
.Xr pam_info 3 ,
.Xr pam_prompt 3 ,
.Xr pam_strerror 3 ,
.Xr pam_verror 3 ,
.Xr pam_vinfo 3 ,
.Xr vsnprintf 3
.Sh STANDARDS
The
.Nm
function is an OpenPAM extension.
.Sh AUTHORS
The
.Nm
function and this manual page were developed for the
.Fx
Project by ThinkSec AS and Network Associates Laboratories, the
Security Research Division of Network Associates, Inc.\& under
DARPA/SPAWAR contract N66001-01-C-8035
.Pq Dq CBOSS ,
as part of the DARPA CHATS research program.