openpam_subst(3)	substitute PAM item values in a string
openpam, openpam_borrow_cred, openpam_free_data, openpam_free_envlist, openpam_get_feature, openpam_get_option, openpam_log, openpam_nullconv, openpam_readline, openpam_readlinev, openpam_readword, openpam_restore_cred, openpam_set_feature, openpam_set_option, openpam_straddch, openpam_subst, openpam_ttyconv, pam_error, pam_get_authtok, pam_info, pam_prompt, pam_setenv, pam_verror, pam_vinfo, pam_vprompt(3)	Pluggable Authentication Modules Library

NAME

openpam_subst — substitute PAM item values in a string

SYNOPSIS

#include <sys/types.h>
#include <security/pam_appl.h>
#include <security/openpam.h>

int
openpam_subst(const pam_handle_t *pamh, char *buf, size_t *bufsize, const char *template);

DESCRIPTION

The openpam_subst() function expands a string, substituting PAM item values for all occurrences of specific substitution codes. The template argument points to the initial string. The result is stored in the buffer pointed to by the buf argument; the bufsize argument specifies the size of that buffer. The actual size of the resulting string, including the terminating NUL character, is stored in the location pointed to by the bufsize argument.

If buf is NULL, or if the buffer is too small to hold the expanded string, bufsize is updated to reflect the amount of space required to hold the entire string, and openpam_subst() returns PAM_TRY_AGAIN.

If openpam_subst() fails for any other reason, the bufsize argument is untouched, but part of the buffer may still have been overwritten.

Substitution codes are introduced by a percent character and correspond to PAM items: