/*
 *
 *   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
 *	msgctl05.c
 *
 * DESCRIPTION
 *	msgctl05 - test for EPERM error
 *
 * ALGORITHM
 *	create a message queue as root
 *	fork a child process and change its ID to nobody
 *	loop if that option was specified
 *	try to remove the queue in the child process with msgctl()
 *	check the errno value
 *	  issue a PASS message if we get EPERM
 *	otherwise, the tests fails
 *	  issue a FAIL message
 *	  break any remaining tests
 *	  call cleanup
 *
 * USAGE:  <for command-line>
 *  msgctl05 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -e   : Turn on errno logging.
 *	       -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
 *	03/2001 - Written by Wayne Boyer
 *
 * RESTRICTIONS
 *	The test must be run as root.
 *	There must be a nobody ID installed on the system.
 */

#include <string.h>
#include <pwd.h>
#include <sys/wait.h>

#include "test.h"
#include "usctest.h"

#include "ipcmsg.h"

char *TCID = "msgctl05";
int TST_TOTAL = 1;

int exp_enos[] = { EPERM, 0 };	/* 0 terminated list of expected errnos */

int msg_q_1 = -1;		/* The message queue id created in setup */
uid_t ltp_uid;			/* The user ID for a non root user */
char *ltp_user = "nobody";	/* A non root user */

struct msqid_ds q_buf;

int main(int ac, char **av)
{
	const char *msg;
	pid_t pid;
	void do_child(void);

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

	setup();		/* global setup */

	if ((pid = FORK_OR_VFORK()) == -1) {
		tst_brkm(TBROK, cleanup, "could not fork");
	}

	if (pid == 0) {		/* child */
		/* set the user ID of the child to nobody */
		if (setuid(ltp_uid) == -1) {
			tst_resm(TBROK, "setuid() failed");
			exit(1);
		}

		do_child();
	} else {		/* parent */
		if (waitpid(pid, NULL, 0) == -1) {
			tst_resm(TBROK | TERRNO, "waitpid() failed");
		}

		/* if it exists, remove the message queue */
		rm_queue(msg_q_1);

		tst_rmdir();
	}

	cleanup();
	/**NOT REACHED**/
	tst_exit();
}

/*
 * do_child - make the TEST call as the child process
 */
void do_child(void)
{
	int lc;
	int i;

	/* The following loop checks looping state if -i option given */

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		/* reset tst_count in case we are looping */
		tst_count = 0;

		/* loop through the test cases */

		for (i = 0; i < TST_TOTAL; i++) {
			TEST(msgctl(msg_q_1, IPC_RMID, NULL));

			if (TEST_RETURN != -1) {
				tst_resm(TFAIL, "msgget() call succeeded "
					 "on expected fail");
				continue;
			}

			TEST_ERROR_LOG(TEST_ERRNO);

			switch (TEST_ERRNO) {
			case EPERM:
				tst_resm(TPASS, "expected error = %d : %s",
					 TEST_ERRNO, strerror(TEST_ERRNO));
				break;
			default:
				tst_resm(TFAIL, "call failed with unexpected "
					 "error - %d : %s", TEST_ERRNO,
					 strerror(TEST_ERRNO));
				break;
			}
		}
	}
}

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

	tst_sig(FORK, DEF_HANDLER, cleanup);

	/* Set up the expected error numbers for -e option */
	TEST_EXP_ENOS(exp_enos);

	TEST_PAUSE;

	/*
	 * Create a temporary directory and cd into it.
	 * This helps to ensure that a unique msgkey is created.
	 * See ../lib/libipc.c for more information.
	 */
	tst_tmpdir();

	msgkey = getipckey();

	/* now we have a key, so let's create a message queue */
	if ((msg_q_1 = msgget(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW)) == -1) {
		tst_brkm(TBROK, cleanup, "Can't create message queue #1");
	}

	/* get the user ID for a non root user */
	ltp_uid = getuserid(ltp_user);
}

/*
 * cleanup() - performs all the 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;

}
