Initial commit

23 files changed, 729 insertions, 0 deletions

diff --git a/src/include/grp.h b/src/include/grp.h
new file mode 100644
index 0000000..4516a19
--- /dev/null
+++ b/src/include/grp.h
@@ -0,0 +1,27 @@
+/* ISC license. */
+
+/*
+  This file is part of the nsss package.
+  See https://skarnet.org/software/nsss/
+*/
+
+#ifndef GRP_H
+#define GRP_H
+
+#include <nsss/grp.h>
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#include <sys/types.h>
+extern int getgrouplist (char const *, gid_t, gid_t *, int *) ;
+extern int setgroups (size_t, gid_t const *) ;
+extern int initgroups (char const *, gid_t) ;
+#endif
+
+#ifdef _GNU_SOURCE
+#include <stdio.h>
+extern struct group *fgetgrent (FILE *) ;
+extern int fgetgrent_r (FILE *, struct group *, char *, size_t, struct group **) ;
+extern int putgrent (struct group const *, FILE *) ;
+#endif
+
+#endif
diff --git a/src/include/nsss/grp-all.h b/src/include/nsss/grp-all.h
new file mode 100644
index 0000000..54ea213
--- /dev/null
+++ b/src/include/nsss/grp-all.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_GRP_ALL_H
+#define NSSS_GRP_ALL_H
+
+#include <nsss/grp-def.h>
+
+/* switch then fallback on unix */
+
+extern void nsss_all_setgrent (void) ;
+extern struct group *nsss_all_getgrent (void) ;
+extern int nsss_all_getgrent_r (struct group *, char *, size_t, struct group **) ;
+extern void nsss_all_endgrent (void) ;
+
+extern struct group *nsss_all_getgrgid (gid_t) ;
+extern struct group *nsss_all_getgrnam (char const *) ;
+extern int nsss_all_getgrgid_r (gid_t, struct group *, char *, size_t, struct group **) ;
+extern int nsss_all_getgrnam_r (char const *, struct group *, char *, size_t, struct group **) ;
+
+#endif
diff --git a/src/include/nsss/grp-def.h b/src/include/nsss/grp-def.h
new file mode 100644
index 0000000..0a6db50
--- /dev/null
+++ b/src/include/nsss/grp-def.h
@@ -0,0 +1,16 @@
+/* ISC license. */
+
+#ifndef NSSS_GRP_DEF_H
+#define NSSS_GRP_DEF_H
+
+#include <sys/types.h>
+
+struct group
+{
+  char *gr_name ;
+  char *gr_passwd ;
+  gid_t gr_gid ;
+  char **gr_mem ;
+} ;
+
+#endif
diff --git a/src/include/nsss/grp-switch.h b/src/include/nsss/grp-switch.h
new file mode 100644
index 0000000..6a9ba10
--- /dev/null
+++ b/src/include/nsss/grp-switch.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_GRP_SWITCH_H
+#define NSSS_GRP_SWITCH_H
+
+#include <nsss/grp-def.h>
+
+ /* Group functions contacting the nsssd daemon */
+
+extern void nsss_switch_setgrent (void) ;
+extern struct group *nsss_switch_getgrent (void) ;
+extern int nsss_switch_getgrent_r (struct group *, char *, size_t, struct group **) ;
+extern void nsss_switch_endgrent (void) ;
+
+extern struct group *nsss_switch_getgrgid (gid_t) ;
+extern struct group *nsss_switch_getgrnam (char const *) ;
+extern int nsss_switch_getgrgid_r (gid_t, struct group *, char *, size_t, struct group **) ;
+extern int nsss_switch_getgrnam_r (char const *, struct group *, char *, size_t, struct group **) ;
+
+#endif
diff --git a/src/include/nsss/grp-unix.h b/src/include/nsss/grp-unix.h
new file mode 100644
index 0000000..fe089f1
--- /dev/null
+++ b/src/include/nsss/grp-unix.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_GRP_UNIX_H
+#define NSSS_GRP_UNIX_H
+
+#include <nsss/grp-def.h>
+
+ /* /etc/group backend */
+
+extern void nsss_unix_setgrent (void) ;
+extern struct group *nsss_unix_getgrent (void) ;
+extern int nsss_unix_getgrent_r (struct group *, char *, size_t, struct group **) ;
+extern void nsss_unix_endgrent (void) ;
+
+extern struct group *nsss_unix_getgrgid (gid_t) ;
+extern struct group *nsss_unix_getgrnam (char const *) ;
+extern int nsss_unix_getgrgid_r (gid_t, struct group *, char *, size_t, struct group **) ;
+extern int nsss_unix_getgrnam_r (char const *, struct group *, char *, size_t, struct group **) ;
+
+#endif
diff --git a/src/include/nsss/grp.h b/src/include/nsss/grp.h
new file mode 100644
index 0000000..ea963b6
--- /dev/null
+++ b/src/include/nsss/grp.h
@@ -0,0 +1,58 @@
+/* ISC license. */
+
+#ifndef NSSS_GRP_H
+#define NSSS_GRP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef NSSS_DISABLE_SWITCH
+
+#include <nsss/grp-unix.h>
+
+#define setgrent nsss_unix_setgrent
+#define getgrent nsss_unix_getgrent
+#define getgrent_r nsss_unix_getgrent_r
+#define endgrent nsss_unix_endgrent
+#define getgrgid nsss_unix_getgrgid
+#define getgrgid_r nsss_unix_getgrgid_r
+#define getgrnam nsss_unix_getgrnam
+#define getgrnam_r nsss_unix_getgrnam_r
+
+#else
+#ifdef NSSS_DISABLE_UNIX
+
+#include <nsss/grp-switch.h>
+
+#define setgrent nsss_switch_setgrent
+#define getgrent nsss_switch_getgrent
+#define getgrent_r nsss_switch_getgrent_r
+#define endgrent nsss_switch_endgrent
+#define getgrgid nsss_switch_getgrgid
+#define getgrgid_r nsss_switch_getgrgid_r
+#define getgrnam nsss_switch_getgrnam
+#define getgrnam_r nsss_switch_getgrnam_r
+
+#else
+
+#include <nsss/grp-all.h>
+
+#define setgrent nsss_all_setgrent
+#define getgrent nsss_all_getgrent
+#define getgrent_r nsss_all_getgrent_r
+#define endgrent nsss_all_endgrent
+#define getgrgid nsss_all_getgrgid
+#define getgrgid_r nsss_all_getgrgid_r
+#define getgrnam nsss_all_getgrnam
+#define getgrnam_r nsss_all_getgrnam_r
+
+#endif
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/include/nsss/nsss-all.h b/src/include/nsss/nsss-all.h
new file mode 100644
index 0000000..4530e97
--- /dev/null
+++ b/src/include/nsss/nsss-all.h
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#ifndef NSSS_ALL_H
+#define NSSS_ALL_H
+
+#include <nsss/pwd-all.h>
+#include <nsss/grp-all.h>
+#include <nsss/shadow-all.h>
+
+#endif
diff --git a/src/include/nsss/nsss-switch.h b/src/include/nsss/nsss-switch.h
new file mode 100644
index 0000000..1bfe50f
--- /dev/null
+++ b/src/include/nsss/nsss-switch.h
@@ -0,0 +1,93 @@
+/* ISC license. */
+
+#ifndef NSSS_SWITCH_H
+#define NSSS_SWITCH_H
+
+#include <sys/types.h>
+#include <limits.h>
+#include <skalibs/tai.h>
+#include <skalibs/buffer.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <nsss/pwd-switch.h>
+#include <nsss/grp-switch.h>
+#include <nsss/shadow-switch.h>
+
+#define NSSS_SWITCH_BUFSIZE 4096
+#define NSSS_SWITCH_NAME_MAXLEN LOGIN_NAME_MAX
+
+typedef struct nsss_switch_s nsss_switch_t, *nsss_switch_t_ref ;
+struct nsss_switch_s
+{
+  unsigned int held ;
+  buffer b ;
+  char buf[NSSS_SWITCH_BUFSIZE] ;
+} ;
+#define NSSS_SWITCH_ZERO { .held = 0, .b = BUFFER_ZERO }
+
+#define NSSS_SWITCH_PWD 0
+#define NSSS_SWITCH_GRP 1
+#define NSSS_SWITCH_SHADOW 2
+
+extern int nsss_switch_start (nsss_switch_t *, unsigned int, char const *, tain_t const *, tain_t *) ;
+#define nsss_switch_start_g(a, what, s, deadline) nsss_switch_start(a, what, s, (deadline), &STAMP)
+extern void nsss_switch_end (nsss_switch_t *, unsigned int) ;
+
+
+ /* Password */
+
+#define NSSS_SWITCH_PWD_END '\0'
+#define NSSS_SWITCH_PWD_REWIND '\001'
+#define NSSS_SWITCH_PWD_GET '\002'
+#define NSSS_SWITCH_PWD_GETBYNAME '\003'
+#define NSSS_SWITCH_PWD_GETBYUID '\004'
+
+extern int nsss_switch_pwd_end (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_pwd_end_g(a, deadline) nsss_switch_pwd_end(a, (deadline), &STAMP)
+extern int nsss_switch_pwd_rewind (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_pwd_rewind_g(a, deadline) nsss_switch_pwd_rewind(a, (deadline), &STAMP)
+extern int nsss_switch_pwd_get (nsss_switch_t *, struct passwd *, stralloc *, tain_t const *, tain_t *) ;
+#define nsss_switch_pwd_get_g(a, b, sa, deadline) nsss_switch_pwd_get(a, b, sa, (deadline), &STAMP)
+extern int nsss_switch_pwd_getbyname (nsss_switch_t *, struct passwd *, stralloc *, char const *, tain_t const *, tain_t *) ;
+#define nsss_switch_pwd_getbyname_g(a, b, sa, name, deadline) nsss_switch_pwd_getbyname(a, b, sa, name, (deadline), &STAMP)
+extern int nsss_switch_pwd_getbyuid (nsss_switch_t *, struct passwd *, stralloc *, uid_t, tain_t const *, tain_t *) ;
+#define nsss_switch_pwd_getbyuid_g(a, b, sa, u, deadline) nsss_switch_pwd_getbyuid(a, b, sa, u, (deadline), &STAMP)
+
+
+ /* Group */
+
+#define NSSS_SWITCH_GRP_END '\020'
+#define NSSS_SWITCH_GRP_REWIND '\021'
+#define NSSS_SWITCH_GRP_GET '\022'
+#define NSSS_SWITCH_GRP_GETBYNAME '\023'
+#define NSSS_SWITCH_GRP_GETBYGID '\024'
+
+extern int nsss_switch_grp_end (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_grp_end_g(a, deadline) nsss_switch_grp_end(a, (deadline), &STAMP)
+extern int nsss_switch_grp_rewind (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_grp_rewind_g(a, deadline) nsss_switch_grp_rewind(a, (deadline), &STAMP)
+extern int nsss_switch_grp_get (nsss_switch_t *, struct group *, stralloc *, genalloc *, tain_t const *, tain_t *) ;
+#define nsss_switch_grp_get_g(a, b, sa, ga, deadline) nsss_switch_grp_get(a, b, sa, ga, (deadline), &STAMP)
+extern int nsss_switch_grp_getbyname (nsss_switch_t *, struct group *, stralloc *, genalloc *, char const *, tain_t const *, tain_t *) ;
+#define nsss_switch_grp_getbyname_g(a, b, sa, ga, name, deadline) nsss_switch_grp_getbyname(a, b, sa, ga, name, (deadline), &STAMP)
+extern int nsss_switch_grp_getbygid (nsss_switch_t *, struct group *, stralloc *, genalloc *, gid_t, tain_t const *, tain_t *) ;
+#define nsss_switch_grp_getbygid_g(a, b, sa, ga, g, deadline) nsss_switch_grp_getbygid(a, b, sa, ga, g, (deadline), &STAMP)
+
+
+ /* Shadow */
+
+#define NSSS_SWITCH_SHADOW_END '\040'
+#define NSSS_SWITCH_SHADOW_REWIND '\041'
+#define NSSS_SWITCH_SHADOW_GET '\042'
+#define NSSS_SWITCH_SHADOW_GETBYNAME '\043'
+
+extern int nsss_switch_shadow_end (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_shadow_end_g(a, deadline) nsss_switch_shadow_end(a, (deadline), &STAMP)
+extern int nsss_switch_shadow_rewind (nsss_switch_t *, tain_t const *, tain_t *) ;
+#define nsss_switch_shadow_rewind_g(a, deadline) nsss_switch_shadow_rewind(a, (deadline), &STAMP)
+extern int nsss_switch_shadow_get (nsss_switch_t *, struct spwd *, stralloc *, tain_t const *, tain_t *) ;
+#define nsss_switch_shadow_get_g(a, b, sa, deadline) nsss_switch_shadow_get(a, b, sa, (deadline), &STAMP)
+extern int nsss_switch_shadow_getbyname (nsss_switch_t *, struct spwd *, stralloc *, char const *, tain_t const *, tain_t *) ;
+#define nsss_switch_shadow_getbyname_g(a, b, sa, name, deadline) nsss_switch_shadow_getbyname(a, b, sa, name, (deadline), &STAMP)
+
+#endif
diff --git a/src/include/nsss/nsss-unix.h b/src/include/nsss/nsss-unix.h
new file mode 100644
index 0000000..786bf88
--- /dev/null
+++ b/src/include/nsss/nsss-unix.h
@@ -0,0 +1,61 @@
+/* ISC license. */
+
+#ifndef NSSS_UNIX_H
+#define NSSS_UNIX_H
+
+#include <sys/types.h>
+#include <skalibs/buffer.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <nsss/pwd-unix.h>
+#include <nsss/grp-unix.h>
+#include <nsss/shadow-unix.h>
+
+#define NSSS_UNIX_BUFSIZE 4096
+
+typedef struct nsss_unix_s nsss_unix_t, *nsss_unix_t_ref ;
+struct nsss_unix_s
+{
+  buffer b ;
+  char buf[NSSS_UNIX_BUFSIZE] ;
+} ;
+#define NSSS_UNIX_ZERO { .b = BUFFER_ZERO }
+
+extern int nsss_unix_start (nsss_unix_t *, char const *) ;
+extern int nsss_unix_maybe_start (nsss_unix_t *, char const *) ;
+extern void nsss_unix_end (nsss_unix_t *) ;
+extern int nsss_unix_rewind (nsss_unix_t *) ;
+
+
+ /* Password */
+
+#define nsss_unix_pwd_start(a) nsss_unix_start(a, "/etc/passwd")
+#define nsss_unix_pwd_maybe_start(a) nsss_unix_maybe_start(a, "/etc/passwd")
+#define nsss_unix_pwd_end(a) nsss_unix_end(a)
+#define nsss_unix_pwd_rewind(a) nsss_unix_rewind(a)
+extern int nsss_unix_pwd_get (nsss_unix_t *, struct passwd *, stralloc *) ;
+extern int nsss_unix_pwd_getbyname (nsss_unix_t *, struct passwd *, stralloc *, char const *) ;
+extern int nsss_unix_pwd_getbyuid (nsss_unix_t *, struct passwd *, stralloc *, uid_t) ;
+
+
+ /* Group */
+
+#define nsss_unix_grp_start(a) nsss_unix_start(a, "/etc/group")
+#define nsss_unix_grp_maybe_start(a) nsss_unix_maybe_start(a, "/etc/group")
+#define nsss_unix_grp_end(a) nsss_unix_end(a)
+#define nsss_unix_grp_rewind(a) nsss_unix_rewind(a)
+extern int nsss_unix_grp_get (nsss_unix_t *, struct group *, stralloc *, genalloc *) ;
+extern int nsss_unix_grp_getbyname (nsss_unix_t *, struct group *, stralloc *, genalloc *, char const *) ;
+extern int nsss_unix_grp_getbygid (nsss_unix_t *, struct group *, stralloc *, genalloc *, gid_t) ;
+
+
+ /* Shadow */
+
+#define nsss_unix_shadow_start(a) nsss_unix_start(a, "/etc/shadow")
+#define nsss_unix_shadow_maybe_start(a) nsss_unix_maybe_start(a, "/etc/shadow")
+#define nsss_unix_shadow_end(a) nsss_unix_end(a)
+#define nsss_unix_shadow_rewind(a) nsss_unix_rewind(a)
+extern int nsss_unix_shadow_get (nsss_unix_t *, struct spwd *, stralloc *) ;
+extern int nsss_unix_shadow_getbyname (nsss_unix_t *, struct spwd *, stralloc *, char const *) ;
+
+#endif
diff --git a/src/include/nsss/nsss.h b/src/include/nsss/nsss.h
new file mode 100644
index 0000000..56e7c08
--- /dev/null
+++ b/src/include/nsss/nsss.h
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#ifndef NSSS_H
+#define NSSS_H
+
+#include <nsss/nsss-unix.h>
+#include <nsss/nsss-switch.h>
+#include <nsss/nsss-all.h>
+
+#endif
diff --git a/src/include/nsss/nsssd.h b/src/include/nsss/nsssd.h
new file mode 100644
index 0000000..7649873
--- /dev/null
+++ b/src/include/nsss/nsssd.h
@@ -0,0 +1,84 @@
+/* ISC license. */
+
+#ifndef NSSSD_H
+#define NSSSD_H
+
+#include <sys/types.h>
+#include <nsss/pwd-def.h>
+#include <nsss/grp-def.h>
+#include <nsss/shadow-def.h>
+
+#define NSSSD_EOF 255
+
+typedef struct nsssd_passwd_s nsssd_passwd_t, *nsssd_passwd_t_ref ;
+struct nsssd_passwd_s
+{
+  size_t pw_name ;
+  size_t pw_passwd ;
+  uid_t pw_uid ;
+  uid_t pw_gid ;
+  size_t pw_gecos ;
+  size_t pw_dir ;
+  size_t pw_shell ;
+} ;
+
+typedef struct nsssd_group_s nsssd_group_t, *nsssd_group_t_ref ;
+struct nsssd_group_s
+{
+  size_t gr_name ;
+  size_t gr_passwd ;
+  gid_t gr_gid ;
+  size_t gr_mem ;
+  size_t gr_mem_n ;
+} ;
+
+typedef struct nsssd_spwd_s nsssd_spwd_t, *nsssd_spwd_t_ref ;
+struct nsssd_spwd_s
+{
+  size_t sp_namp ;
+  size_t sp_pwdp ;
+  long sp_lstchg ;
+  long sp_min ;
+  long sp_max ;
+  long sp_warn ;
+  long sp_inact ;
+  long sp_expire ;
+  unsigned long sp_flag ;
+} ;
+
+
+/* Functions provided by libnsssd */
+
+extern int nsssd_main (char const *const *, char const *const *) ;
+extern void nsssd_passwd_convert (struct passwd *, nsssd_passwd_t const *, char const *) ;
+extern void nsssd_group_convert (struct group *, char **, nsssd_group_t const *, char const *, size_t const *) ;
+extern void nsssd_spwd_convert (struct spwd *, nsssd_spwd_t const *, char const *) ;
+
+
+/* Functions that must be provided by the backend */
+
+extern void *nsssd_handle_init (void) ;
+extern int nsssd_handle_start (void *, char const *const *, char const *const *) ;
+extern void nsssd_handle_end (void *) ;
+
+extern int nsssd_pwd_start (void *) ;
+extern int nsssd_pwd_rewind (void *) ;
+extern int nsssd_pwd_get (void *, struct passwd *) ;
+extern int nsssd_pwd_getbyuid (void *, struct passwd *, uid_t) ;
+extern int nsssd_pwd_getbyname (void *, struct passwd *, char const *) ;
+extern void nsssd_pwd_end (void *) ;
+
+extern int nsssd_grp_start (void *) ;
+extern int nsssd_grp_rewind (void *) ;
+extern int nsssd_grp_get (void *, struct group *) ;
+extern int nsssd_grp_getbygid (void *, struct group *, gid_t) ;
+extern int nsssd_grp_getbyname (void *, struct group *, char const *) ;
+extern void nsssd_grp_end (void *) ;
+
+extern int nsssd_shadow_start (void *) ;
+extern int nsssd_shadow_rewind (void *) ;
+extern int nsssd_shadow_get (void *, struct spwd *) ;
+extern int nsssd_shadow_getbyname (void *, struct spwd *, char const *) ;
+extern void nsssd_shadow_end (void *) ;
+
+#endif
diff --git a/src/include/nsss/pwd-all.h b/src/include/nsss/pwd-all.h
new file mode 100644
index 0000000..02d38a3
--- /dev/null
+++ b/src/include/nsss/pwd-all.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_PWD_ALL_H
+#define NSSS_PWD_ALL_H
+
+#include <nsss/pwd-def.h>
+
+ /* switch then fallback on unix */
+
+extern void nsss_all_setpwent (void) ;
+extern struct passwd *nsss_all_getpwent (void) ;
+extern int nsss_all_getpwent_r (struct passwd *, char *, size_t, struct passwd **) ;
+extern void nsss_all_endpwent (void) ;
+
+extern struct passwd *nsss_all_getpwuid (uid_t) ;
+extern int nsss_all_getpwuid_r (uid_t, struct passwd *, char *, size_t, struct passwd **) ;
+extern struct passwd *nsss_all_getpwnam (char const *) ;
+extern int nsss_all_getpwnam_r (char const *, struct passwd *, char *, size_t, struct passwd **) ;
+
+#endif
diff --git a/src/include/nsss/pwd-def.h b/src/include/nsss/pwd-def.h
new file mode 100644
index 0000000..44a4538
--- /dev/null
+++ b/src/include/nsss/pwd-def.h
@@ -0,0 +1,19 @@
+/* ISC license. */
+
+#ifndef NSSS_PWD_DEF_H
+#define NSSS_PWD_DEF_H
+
+#include <sys/types.h>
+
+struct passwd
+{
+  char *pw_name ;
+  char *pw_passwd ;
+  uid_t pw_uid ;
+  gid_t pw_gid ;
+  char *pw_gecos ;
+  char *pw_dir ;
+  char *pw_shell ;
+} ;
+
+#endif
diff --git a/src/include/nsss/pwd-switch.h b/src/include/nsss/pwd-switch.h
new file mode 100644
index 0000000..f9ac48c
--- /dev/null
+++ b/src/include/nsss/pwd-switch.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_PWD_SWITCH_H
+#define NSSS_PWD_SWITCH_H
+
+#include <nsss/pwd-def.h>
+
+ /* Password functions contacting the nsssd daemon */
+
+extern void nsss_switch_setpwent (void) ;
+extern struct passwd *nsss_switch_getpwent (void) ;
+extern int nsss_switch_getpwent_r (struct passwd *, char *, size_t, struct passwd **) ;
+extern void nsss_switch_endpwent (void) ;
+
+extern struct passwd *nsss_switch_getpwuid (uid_t) ;
+extern int nsss_switch_getpwuid_r (uid_t, struct passwd *, char *, size_t, struct passwd **) ;
+extern struct passwd *nsss_switch_getpwnam (char const *) ;
+extern int nsss_switch_getpwnam_r (char const *, struct passwd *, char *, size_t, struct passwd **) ;
+
+#endif
diff --git a/src/include/nsss/pwd-unix.h b/src/include/nsss/pwd-unix.h
new file mode 100644
index 0000000..9b1d60c
--- /dev/null
+++ b/src/include/nsss/pwd-unix.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#ifndef NSSS_PWD_UNIX_H
+#define NSSS_PWD_UNIX_H
+
+#include <nsss/pwd-def.h>
+
+ /* /etc/passwd backend */
+
+extern void nsss_unix_setpwent (void) ;
+extern struct passwd *nsss_unix_getpwent (void) ;
+extern int nsss_unix_getpwent_r (struct passwd *, char *, size_t, struct passwd **) ;
+extern void nsss_unix_endpwent (void) ;
+
+extern struct passwd *nsss_unix_getpwuid (uid_t) ;
+extern int nsss_unix_getpwuid_r (uid_t, struct passwd *, char *, size_t, struct passwd **) ;
+extern struct passwd *nsss_unix_getpwnam (char const *) ;
+extern int nsss_unix_getpwnam_r (char const *, struct passwd *, char *, size_t, struct passwd **) ;
+
+#endif
diff --git a/src/include/nsss/pwd.h b/src/include/nsss/pwd.h
new file mode 100644
index 0000000..950a5ce
--- /dev/null
+++ b/src/include/nsss/pwd.h
@@ -0,0 +1,58 @@
+/* ISC license. */
+
+#ifndef NSSS_PWD_H
+#define NSSS_PWD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef NSSS_DISABLE_SWITCH
+
+#include <nsss/pwd-unix.h>
+
+#define setpwent nsss_unix_setpwent
+#define getpwent nsss_unix_getpwent
+#define getpwent_r nsss_unix_getpwent_r
+#define endpwent nsss_unix_endpwent
+#define getpwuid nsss_unix_getpwuid
+#define getpwuid_r nsss_unix_getpwuid_r
+#define getpwnam nsss_unix_getpwnam
+#define getpwnam_r nsss_unix_getpwnam_r
+
+#else
+#ifdef NSSS_DISABLE_UNIX
+
+#include <nsss/pwd-switch.h>
+
+#define setpwent nsss_switch_setpwent
+#define getpwent nsss_switch_getpwent
+#define getpwent_r nsss_switch_getpwent_r
+#define endpwent nsss_switch_endpwent
+#define getpwuid nsss_switch_getpwuid
+#define getpwuid_r nsss_switch_getpwuid_r
+#define getpwnam nsss_switch_getpwnam
+#define getpwnam_r nsss_switch_getpwnam_r
+
+#else
+
+#include <nsss/pwd-all.h>
+
+#define setpwent nsss_all_setpwent
+#define getpwent nsss_all_getpwent
+#define getpwent_r nsss_all_getpwent_r
+#define endpwent nsss_all_endpwent
+#define getpwuid nsss_all_getpwuid
+#define getpwuid_r nsss_all_getpwuid_r
+#define getpwnam nsss_all_getpwnam
+#define getpwnam_r nsss_all_getpwnam_r
+
+#endif
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/include/nsss/shadow-all.h b/src/include/nsss/shadow-all.h
new file mode 100644
index 0000000..09da550
--- /dev/null
+++ b/src/include/nsss/shadow-all.h
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#ifndef NSSS_SHADOW_ALL_H
+#define NSSS_SHADOW_ALL_H
+
+#include <nsss/shadow-def.h>
+
+/* switch then fallback on unix */
+
+extern void nsss_all_setspent (void) ;
+extern struct spwd *nsss_all_getspent (void) ;
+extern int nsss_all_getspent_r (struct spwd *, char *, size_t, struct spwd **) ;
+extern void nsss_all_endspent (void) ;
+
+extern struct spwd *nsss_all_getspnam (char const *) ;
+extern int nsss_all_getspnam_r (char const *, struct spwd *, char *, size_t, struct spwd **) ;
+
+#endif
diff --git a/src/include/nsss/shadow-def.h b/src/include/nsss/shadow-def.h
new file mode 100644
index 0000000..7b73b95
--- /dev/null
+++ b/src/include/nsss/shadow-def.h
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#ifndef NSSS_SHADOW_DEF_H
+#define NSSS_SHADOW_DEF_H
+
+#include <sys/types.h>
+
+struct spwd
+{
+  char *sp_namp ;
+  char *sp_pwdp ;
+  long sp_lstchg ;
+  long sp_min ;
+  long sp_max ;
+  long sp_warn ;
+  long sp_inact ;
+  long sp_expire ;
+  unsigned long sp_flag ;
+} ;
+
+#endif
diff --git a/src/include/nsss/shadow-switch.h b/src/include/nsss/shadow-switch.h
new file mode 100644
index 0000000..0126125
--- /dev/null
+++ b/src/include/nsss/shadow-switch.h
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#ifndef NSSS_SHADOW_SWITCH_H
+#define NSSS_SHADOW_SWITCH_H
+
+#include <nsss/shadow-def.h>
+
+ /* Shadow functions contacting the nsssd daemon */
+
+extern void nsss_switch_setspent (void) ;
+extern struct spwd *nsss_switch_getspent (void) ;
+extern int nsss_switch_getspent_r (struct spwd *, char *, size_t, struct spwd **) ;
+extern void nsss_switch_endspent (void) ;
+
+extern struct spwd *nsss_switch_getspnam (char const *) ;
+extern int nsss_switch_getspnam_r (char const *, struct spwd *, char *, size_t, struct spwd **) ;
+
+#endif
diff --git a/src/include/nsss/shadow-unix.h b/src/include/nsss/shadow-unix.h
new file mode 100644
index 0000000..6b7a111
--- /dev/null
+++ b/src/include/nsss/shadow-unix.h
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#ifndef NSSS_SHADOW_UNIX_H
+#define NSSS_SHADOW_UNIX_H
+
+#include <nsss/shadow-def.h>
+
+ /* /etc/shadow functions */
+
+extern void nsss_unix_setspent (void) ;
+extern struct spwd *nsss_unix_getspent (void) ;
+extern int nsss_unix_getspent_r (struct spwd *, char *, size_t, struct spwd **) ;
+extern void nsss_unix_endspent (void) ;
+
+extern struct spwd *nsss_unix_getspnam (char const *) ;
+extern int nsss_unix_getspnam_r (char const *, struct spwd *, char *, size_t, struct spwd **) ;
+
+#endif
diff --git a/src/include/nsss/shadow.h b/src/include/nsss/shadow.h
new file mode 100644
index 0000000..c3357fd
--- /dev/null
+++ b/src/include/nsss/shadow.h
@@ -0,0 +1,52 @@
+/* ISC license. */
+
+#ifndef NSSS_SHADOW_H
+#define NSSS_SHADOW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef NSSS_DISABLE_SWITCH
+
+#include <nsss/shadow-unix.h>
+
+#define setspent nsss_unix_setspent
+#define getspent nsss_unix_getspent
+#define getspent_r nsss_unix_getspent_r
+#define endspent nsss_unix_endspent
+#define getspnam nsss_unix_getspnam
+#define getspnam_r nsss_unix_getspnam_r
+
+#else
+#ifdef NSSS_DISABLE_UNIX
+
+#include <nsss/shadow-switch.h>
+
+#define setspent nsss_switch_setspent
+#define getspent nsss_switch_getspent
+#define getspent_r nsss_switch_getspent_r
+#define endspent nsss_switch_endspent
+#define getspnam nsss_switch_getspnam
+#define getspnam_r nsss_switch_getspnam_r
+
+#else
+
+#include <nsss/shadow-all.h>
+
+#define setspent nsss_all_setspent
+#define getspent nsss_all_getspent
+#define getspent_r nsss_all_getspent_r
+#define endspent nsss_all_endspent
+#define getspnam nsss_all_getspnam
+#define getspnam_r nsss_all_getspnam_r
+
+#endif
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/include/pwd.h b/src/include/pwd.h
new file mode 100644
index 0000000..6ad4faf
--- /dev/null
+++ b/src/include/pwd.h
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+/*
+  This file is part of the nsss package.
+  See https://skarnet.org/software/nsss/
+*/
+
+#ifndef PWD_H
+#define PWD_H
+
+#include <nsss/pwd.h>
+
+#ifdef _GNU_SOURCE
+#include <stdio.h>
+extern struct passwd *fgetpwent (FILE *) ;
+extern int fgetpwent_r (FILE *, struct passwd *, char *, size_t, struct passwd **) ;
+extern int putpwent (struct passwd const *, FILE *) ;
+#endif
+
+#endif
diff --git a/src/include/shadow.h b/src/include/shadow.h
new file mode 100644
index 0000000..00d1944
--- /dev/null
+++ b/src/include/shadow.h
@@ -0,0 +1,26 @@
+/* ISC license. */
+
+/*
+  This file is part of the nsss package.
+  See https://skarnet.org/software/nsss/
+*/
+
+#ifndef SHADOW_H
+#define SHADOW_H
+
+#include <nsss/shadow.h>
+
+#include <stdio.h>
+
+extern struct spwd *fgetspent (FILE *) ;
+extern struct spwd *sgetspent (char const *) ;
+extern int putspent (struct spwd const *, FILE *) ;
+extern int lckpwdf (void) ;
+extern int ulckpwdf (void) ;
+
+#ifdef _DEFAULT_SOURCE
+extern int fgetspent_r(FILE *, struct spwd *, char *, size_t, struct spwd **) ;
+extern int sgetspent_r (char const *, struct spwd *, char *, size_t, struct spwd **) ;
+#endif
+
+#endif