/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * NAME
 * 	setresuid02.c
 *
 * DESCRIPTION
 * 	Test that a non-root user can change the real, effective and saved
 *	uid values through the setresuid system call.
 *
 * ALGORITHM
 *
 *	Setup:
 *	  Setup signal handling
 *	  Get user information.
 *	  Pause for SIGUSER1 if option specified.
 *
 *	Setup test values.
 *	Loop if the proper options are given.
 * 	For each test set execute the system call
 * 	  Check that we received the expected result.
 *	  Verify that the uid, euid and suid values are still correct.
 *	Cleanup:
 *	  Print errno log and/or timing stats if option given.
 *
 * USAGE:  <for command-line>
 *	setresuid02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
 *	where,  -c n : Run n copies concurrently.
 *		-f   : Turn off functionality Testing.
 *		-i n : Execute test n times.
 *		-I x : Execute test for x seconds.
 *		-P x : Pause for x seconds between iterations.
 *		-t   : Turn on syscall timing.
 *
 * History
 *	07/2001 John George
 *		-Ported
 *
 * Restrictions
 * 	This test must be run by root.
 *	nobody and bin must be a valid users.
 */

#define _GNU_SOURCE 1
#include <pwd.h>
#include <stdlib.h>
#include "test.h"
#include "usctest.h"
#include <errno.h>
#include <sys/wait.h>

char *TCID = "setresuid02";

uid_t neg_one = -1;

/* flag to tell parent if child passed or failed. */
int flag = 0;

uid_t nobody_pw_uid, bin_pw_uid;
char user1name[] = "nobody";
char user2name[] = "bin";

struct passwd nobody, bin;

/*
 * The following structure contains all test data.  Each structure in the array
 * is used for a separate test.  The tests are executed in the for loop below.
 */

struct test_data_t {
	uid_t *real_uid;
	uid_t *eff_uid;
	uid_t *sav_uid;
	struct passwd *exp_real_usr;
	struct passwd *exp_eff_usr;
	struct passwd *exp_sav_usr;
	char *test_msg;
} test_data[] = {
	{
	&neg_one, &neg_one, &bin_pw_uid, &nobody, &bin, &bin,
		    "After setresuid(-1, -1, bin),"}, {
	&neg_one, &nobody_pw_uid, &neg_one, &nobody, &nobody, &bin,
		    "After setresuid(-1, nobody -1),"}, {
&bin_pw_uid, &neg_one, &neg_one, &bin, &nobody, &bin,
		    "After setresuid(bin, -1 -1),"},};

int TST_TOTAL = sizeof(test_data) / sizeof(test_data[0]);

void setup(void);
void cleanup(void);

void
uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *);

int main(int ac, char **av)
{
	int lc;
	const char *msg;
	int status;

	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) {
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	}

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		int i, pid;

		/* reset tst_count in case we are looping */
		tst_count = 0;

		/* set the appropriate ownership values */
		if (setresuid(nobody_pw_uid, bin_pw_uid, nobody_pw_uid) == -1) {
			tst_brkm(TFAIL, cleanup, "Initial setresuid failed");
		}

		if ((pid = FORK_OR_VFORK()) == -1) {
			tst_brkm(TBROK, cleanup, "fork failed");
		} else if (pid == 0) {	/* child */

			for (i = 0; i < TST_TOTAL; i++) {

				/* Set the real, effective or saved user id */
				TEST(setresuid(*test_data[i].real_uid,
					       *test_data[i].eff_uid,
					       *test_data[i].sav_uid));

				if (TEST_RETURN != -1) {
					tst_resm(TPASS, "setresuid(%d, %d, %d) "
						 "succeeded as expected.",
						 *test_data[i].real_uid,
						 *test_data[i].eff_uid,
						 *test_data[i].sav_uid);
				} else {
					tst_resm(TFAIL, "setresuid(%d, %d, %d) "
						 "did not return as expected.",
						 *test_data[i].real_uid,
						 *test_data[i].eff_uid,
						 *test_data[i].sav_uid);
					flag = -1;
				}

				uid_verify(test_data[i].exp_real_usr,
					   test_data[i].exp_eff_usr,
					   test_data[i].exp_sav_usr,
					   test_data[i].test_msg);
			}
			exit(flag);
		} else {	/* parent */
			waitpid(pid, &status, 0);
			if (WEXITSTATUS(status) != 0) {
				tst_resm(TFAIL, "test failed within "
					 "child process.");
			}
		}
	}
	cleanup();
	tst_exit();
}

/*
 * setup()
 *	performs all ONE TIME setup for this test
 */
void setup(void)
{
	tst_require_root(NULL);

	tst_sig(FORK, DEF_HANDLER, cleanup);

	if (getpwnam("nobody") == NULL) {
		tst_brkm(TBROK, NULL, "nobody must be a valid user.");
		tst_exit();
	}

	if (getpwnam("bin") == NULL) {
		tst_brkm(TBROK, NULL, "bin must be a valid user.");
		tst_exit();
	}

	nobody = *(getpwnam("nobody"));
	nobody_pw_uid = nobody.pw_uid;

	bin = *(getpwnam("bin"));
	bin_pw_uid = bin.pw_uid;

	/* Pause if that option was specified
	 * TEST_PAUSE contains the code to fork the test with the -i option.
	 * You want to make sure you do this before you create your temporary
	 * directory.
	 */
	TEST_PAUSE;
}

/*
 * cleanup()
 *	performs all ONE TIME cleanup for this test at
 *	completion or premature exit
 */
void cleanup(void)
{
	/*
	 * print timing stats if that option was specified.
	 * print errno log if that option was specified.
	 */
	TEST_CLEANUP;

}

void
uid_verify(struct passwd *ru, struct passwd *eu, struct passwd *su, char *when)
{
	uid_t cur_ru, cur_eu, cur_su;
	if (getresuid(&cur_ru, &cur_eu, &cur_su) != 0) {
		flag = -1;
		tst_brkm(TBROK, cleanup, "Set getresuid() failed");
	}
	if ((cur_ru != ru->pw_uid) || (cur_eu != eu->pw_uid) || (cur_su !=
								 su->pw_uid)) {
		tst_resm(TFAIL, "ERROR: %s real uid = %d; effective uid = %d; "
			 "saved uid = %d", when, cur_ru, cur_eu, cur_su);
		tst_resm(TINFO, "Expected: real uid = %d, effective uid = %d "
			 "saved uid = %d", ru->pw_uid, eu->pw_uid, su->pw_uid);
		flag = -1;
	} else {
		tst_resm(TINFO, "real uid = %d, effective uid = %d, and "
			 "saved uid = %d as expected", cur_ru, cur_eu, cur_su);
	}
}
