/*
   Unix SMB/CIFS implementation.
   nss tester for winbindd
   Copyright (C) Andrew Tridgell 2001
   Copyright (C) Tim Potter 2003

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "nsswitch/nsstest.h"

#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)

static const char *so_path = "/lib/libnss_winbind.so";
static const char *nss_name = "winbind";
static int nss_errno;
static NSS_STATUS last_error;
static int total_errors;

static void *find_fn(const char *name)
{
	char *s;
	static void *h;
	void *res;

	if (asprintf(&s, "_nss_%s_%s", nss_name, name) < 0) {
		exit(1);
	}

	if (!h) {
		h = dlopen(so_path, RTLD_LAZY);
	}
	if (!h) {
		printf("Can't open shared library %s\n", so_path);
		exit(1);
	}
	res = dlsym(h, s);
	if (!res) {
		printf("Can't find function %s\n", s);
		total_errors++;
		SAFE_FREE(s);
		return NULL;
	}
	SAFE_FREE(s);
	return res;
}

static void report_nss_error(const char *who, NSS_STATUS status)
{
	last_error = status;
	total_errors++;
	printf("ERROR %s: NSS_STATUS=%d  %d (nss_errno=%d)\n",
	       who, status, NSS_STATUS_SUCCESS, nss_errno);
}

static struct passwd *nss_getpwent(void)
{
	NSS_STATUS (*_nss_getpwent_r)(struct passwd *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(struct passwd *, char *,
				size_t, int *))find_fn("getpwent_r");
	static struct passwd pwd;
	static char buf[1000];
	NSS_STATUS status;

	if (!_nss_getpwent_r)
		return NULL;

	status = _nss_getpwent_r(&pwd, buf, sizeof(buf), &nss_errno);
	if (status == NSS_STATUS_NOTFOUND) {
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getpwent", status);
		return NULL;
	}
	return &pwd;
}

static struct passwd *nss_getpwnam(const char *name)
{
	NSS_STATUS (*_nss_getpwnam_r)(const char *, struct passwd *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(const char *, struct passwd *, char *,
				size_t, int *))find_fn("getpwnam_r");
	static struct passwd pwd;
	static char buf[1000];
	NSS_STATUS status;

	if (!_nss_getpwnam_r)
		return NULL;

	status = _nss_getpwnam_r(name, &pwd, buf, sizeof(buf), &nss_errno);
	if (status == NSS_STATUS_NOTFOUND) {
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getpwnam", status);
		return NULL;
	}
	return &pwd;
}

static struct passwd *nss_getpwuid(uid_t uid)
{
	NSS_STATUS (*_nss_getpwuid_r)(uid_t , struct passwd *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(uid_t, struct passwd *, char *,
				size_t, int *))find_fn("getpwuid_r");
	static struct passwd pwd;
	static char buf[1000];
	NSS_STATUS status;

	if (!_nss_getpwuid_r)
		return NULL;

	status = _nss_getpwuid_r(uid, &pwd, buf, sizeof(buf), &nss_errno);
	if (status == NSS_STATUS_NOTFOUND) {
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getpwuid", status);
		return NULL;
	}
	return &pwd;
}

static void samba_nss_setpwent(void)
{
	NSS_STATUS (*_nss_setpwent)(void) =
		(NSS_STATUS(*)(void))find_fn("setpwent");
	NSS_STATUS status;

	if (!_nss_setpwent)
		return;

	status = _nss_setpwent();
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("setpwent", status);
	}
}

static void samba_nss_endpwent(void)
{
	NSS_STATUS (*_nss_endpwent)(void) =
		(NSS_STATUS (*)(void))find_fn("endpwent");
	NSS_STATUS status;

	if (!_nss_endpwent)
		return;

	status = _nss_endpwent();
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("endpwent", status);
	}
}


static struct group *nss_getgrent(void)
{
	NSS_STATUS (*_nss_getgrent_r)(struct group *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(struct group *, char *,
				size_t, int *))find_fn("getgrent_r");
	static struct group grp;
	static char *buf;
	static int buflen = 1024;
	NSS_STATUS status;

	if (!_nss_getgrent_r)
		return NULL;

	if (!buf)
		buf = (char *)malloc(buflen);

again:
	status = _nss_getgrent_r(&grp, buf, buflen, &nss_errno);
	if (status == NSS_STATUS_TRYAGAIN) {
		char *oldbuf = buf;
		buflen *= 2;
		buf = (char *)realloc(buf, buflen);
		if (!buf) {
			SAFE_FREE(oldbuf);
			return NULL;
		}
		goto again;
	}
	if (status == NSS_STATUS_NOTFOUND) {
		SAFE_FREE(buf);
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getgrent", status);
		SAFE_FREE(buf);
		return NULL;
	}
	return &grp;
}

static struct group *nss_getgrnam(const char *name)
{
	NSS_STATUS (*_nss_getgrnam_r)(const char *, struct group *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(const char *, struct group *, char *,
				size_t, int *))find_fn("getgrnam_r");
	static struct group grp;
	static char *buf;
	static int buflen = 1000;
	NSS_STATUS status;

	if (!_nss_getgrnam_r)
		return NULL;

	if (!buf)
		buf = (char *)malloc(buflen);
again:
	status = _nss_getgrnam_r(name, &grp, buf, buflen, &nss_errno);
	if (status == NSS_STATUS_TRYAGAIN) {
		char *oldbuf = buf;
		buflen *= 2;
		buf = (char *)realloc(buf, buflen);
		if (!buf) {
			SAFE_FREE(oldbuf);
			return NULL;
		}
		goto again;
	}
	if (status == NSS_STATUS_NOTFOUND) {
		SAFE_FREE(buf);
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getgrnam", status);
		SAFE_FREE(buf);
		return NULL;
	}
	return &grp;
}

static struct group *nss_getgrgid(gid_t gid)
{
	NSS_STATUS (*_nss_getgrgid_r)(gid_t , struct group *, char *,
				      size_t , int *) =
		(NSS_STATUS (*)(gid_t, struct group *, char *,
				size_t, int *))find_fn("getgrgid_r");
	static struct group grp;
	static char *buf;
	static int buflen = 1000;
	NSS_STATUS status;

	if (!_nss_getgrgid_r)
		return NULL;

	if (!buf)
		buf = (char *)malloc(buflen);

again:
	status = _nss_getgrgid_r(gid, &grp, buf, buflen, &nss_errno);
	if (status == NSS_STATUS_TRYAGAIN) {
		char *oldbuf = buf;
		buflen *= 2;
		buf = (char *)realloc(buf, buflen);
		if (!buf) {
			SAFE_FREE(oldbuf);
			return NULL;
		}
		goto again;
	}
	if (status == NSS_STATUS_NOTFOUND) {
		SAFE_FREE(buf);
		return NULL;
	}
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("getgrgid", status);
		SAFE_FREE(buf);
		return NULL;
	}
	return &grp;
}

static void samba_nss_setgrent(void)
{
	NSS_STATUS (*_nss_setgrent)(void) =
		(NSS_STATUS (*)(void))find_fn("setgrent");
	NSS_STATUS status;

	if (!_nss_setgrent)
		return;

	status = _nss_setgrent();
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("setgrent", status);
	}
}

static void samba_nss_endgrent(void)
{
	NSS_STATUS (*_nss_endgrent)(void) =
		(NSS_STATUS (*)(void))find_fn("endgrent");
	NSS_STATUS status;

	if (!_nss_endgrent)
		return;

	status = _nss_endgrent();
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("endgrent", status);
	}
}

static int nss_initgroups(char *user, gid_t group, gid_t **groups, long int *start, long int *size)
{
	NSS_STATUS (*_nss_initgroups)(char *, gid_t , long int *,
				      long int *, gid_t **, long int , int *) =
		(NSS_STATUS (*)(char *, gid_t, long int *,
				long int *, gid_t **,
				long int, int *))find_fn("initgroups_dyn");
	NSS_STATUS status;

	if (!_nss_initgroups)
		return NSS_STATUS_UNAVAIL;

	status = _nss_initgroups(user, group, start, size, groups, 0, &nss_errno);
	if (status != NSS_STATUS_SUCCESS) {
		report_nss_error("initgroups", status);
	}
	return status;
}

static void print_passwd(struct passwd *pwd)
{
	printf("%s:%s:%lu:%lu:%s:%s:%s\n",
	       pwd->pw_name,
	       pwd->pw_passwd,
	       (unsigned long)pwd->pw_uid,
	       (unsigned long)pwd->pw_gid,
	       pwd->pw_gecos,
	       pwd->pw_dir,
	       pwd->pw_shell);
}

static void print_group(struct group *grp)
{
	int i;
	printf("%s:%s:%lu:",
	       grp->gr_name,
	       grp->gr_passwd,
	       (unsigned long)grp->gr_gid);

	if (!grp->gr_mem[0]) {
		printf("\n");
		return;
	}

	for (i=0; grp->gr_mem[i+1]; i++) {
		printf("%s,", grp->gr_mem[i]);
	}
	printf("%s\n", grp->gr_mem[i]);
}

static void nss_test_initgroups(char *name, gid_t gid)
{
	long int size = 16;
	long int start = 1;
	gid_t *groups = NULL;
	int i;
	NSS_STATUS status;

	groups = (gid_t *)malloc(sizeof(gid_t) * size);
	if (groups == NULL) {
		printf("Unable to allocate memory for groups\n");
		return;
	}
	groups[0] = gid;

	status = nss_initgroups(name, gid, &groups, &start, &size);
	if (status == NSS_STATUS_UNAVAIL) {
		printf("No initgroups fn\n");
		return;
	}

	for (i=0; i<start-1; i++) {
		printf("%lu, ", (unsigned long)groups[i]);
	}
	printf("%lu\n", (unsigned long)groups[i]);
}


static void nss_test_users(void)
{
	struct passwd *pwd;

	samba_nss_setpwent();
	/* loop over all users */
	while ((pwd = nss_getpwent())) {
		printf("Testing user %s\n", pwd->pw_name);
		printf("getpwent:   "); print_passwd(pwd);
		pwd = nss_getpwuid(pwd->pw_uid);
		if (!pwd) {
			total_errors++;
			printf("ERROR: can't getpwuid\n");
			continue;
		}
		printf("getpwuid:   "); print_passwd(pwd);
		pwd = nss_getpwnam(pwd->pw_name);
		if (!pwd) {
			total_errors++;
			printf("ERROR: can't getpwnam\n");
			continue;
		}
		printf("getpwnam:   "); print_passwd(pwd);
		printf("initgroups: "); nss_test_initgroups(pwd->pw_name, pwd->pw_gid);
		printf("\n");
	}
	samba_nss_endpwent();
}

static void nss_test_groups(void)
{
	struct group *grp;

	samba_nss_setgrent();
	/* loop over all groups */
	while ((grp = nss_getgrent())) {
		printf("Testing group %s\n", grp->gr_name);
		printf("getgrent: "); print_group(grp);
		grp = nss_getgrnam(grp->gr_name);
		if (!grp) {
			total_errors++;
			printf("ERROR: can't getgrnam\n");
			continue;
		}
		printf("getgrnam: "); print_group(grp);
		grp = nss_getgrgid(grp->gr_gid);
		if (!grp) {
			total_errors++;
			printf("ERROR: can't getgrgid\n");
			continue;
		}
		printf("getgrgid: "); print_group(grp);
		printf("\n");
	}
	samba_nss_endgrent();
}

static void nss_test_errors(void)
{
	struct passwd *pwd;
	struct group *grp;

	pwd = getpwnam("nosuchname");
	if (pwd || last_error != NSS_STATUS_NOTFOUND) {
		total_errors++;
		printf("ERROR Non existent user gave error %d\n", last_error);
	}

	pwd = getpwuid(0xFF00);
	if (pwd || last_error != NSS_STATUS_NOTFOUND) {
		total_errors++;
		printf("ERROR Non existent uid gave error %d\n", last_error);
	}

	grp = getgrnam("nosuchgroup");
	if (grp || last_error != NSS_STATUS_NOTFOUND) {
		total_errors++;
		printf("ERROR Non existent group gave error %d\n", last_error);
	}

	grp = getgrgid(0xFFF0);
	if (grp || last_error != NSS_STATUS_NOTFOUND) {
		total_errors++;
		printf("ERROR Non existent gid gave error %d\n", last_error);
	}
}

 int main(int argc, char *argv[])
{
	if (argc > 1) so_path = argv[1];
	if (argc > 2) nss_name = argv[2];

	nss_test_users();
	nss_test_groups();
	nss_test_errors();

	printf("total_errors=%d\n", total_errors);

	return total_errors;
}