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OPENPAM_SUBST(3) NetBSD Library Functions Manual OPENPAM_SUBST(3)
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openpam_subst -- substitute PAM item values in a string
openpam_subst(const pam_handle_t *pamh, char *buf, size_t *bufsize,
const char *template);
The openpam_subst() function expands a string, substituting PAM item val-
ues 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:
%H Replaced by the current value of the PAM_RHOST item.
%h Replaced by the current value of the PAM_HOST item.
%s Replaced by the current value of the PAM_SERVICE
%t Replaced by the current value of the PAM_TTY item.
%U Replaced by the current value of the PAM_RUSER item.
%u Replaced by the current value of the PAM_USER item.
The openpam_subst() function returns one of the following values:
[PAM_BAD_ITEM] Unrecognized or restricted item.
[PAM_TRY_AGAIN] Try again.
pam(3), pam_get_authtok(3), pam_get_item(3), pam_get_user(3),
The openpam_subst() function is an OpenPAM extension.
The openpam_subst() function and this manual page were developed by
Dag-Erling Smørgrav <firstname.lastname@example.org>.
NetBSD 9.99 February 24, 2019 NetBSD 9.99