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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2001
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /*
     21  * NAME
     22  *	chroot02.c
     23  *
     24  * DESCRIPTION
     25  *	Test functionality of chroot(2)
     26  *
     27  * ALGORITHM
     28  *	Change root directory and then stat a file.
     29  *
     30  * USAGE:  <for command-line>
     31  *  chroot02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
     32  *     where,  -c n : Run n copies concurrently.
     33  *             -f   : Turn off functionality Testing.
     34  *             -i n : Execute test n times.
     35  *             -I x : Execute test for x seconds.
     36  *             -P x : Pause for x seconds between iterations.
     37  *             -t   : Turn on syscall timing.
     38  *
     39  * HISTORY
     40  *	07/2001 Ported by Wayne Boyer
     41  *	04/2003 Modified by Manoj Iyer - manjo (at) mail.utexas.edu
     42  *	Change testcase to chroot into a temporary directory
     43  *	and stat() a known file.
     44  *
     45  * RESTRICTIONS
     46  *	NONE
     47  */
     48 
     49 #include <sys/types.h>
     50 #include <sys/stat.h>
     51 #include <sys/wait.h>
     52 #include <errno.h>
     53 #include "test.h"
     54 #include <fcntl.h>
     55 
     56 char *TCID = "chroot02";
     57 int TST_TOTAL = 1;
     58 int fileHandle = 0;
     59 
     60 #define TMP_FILENAME	"chroot02_testfile"
     61 struct stat buf;
     62 
     63 void setup(void);
     64 void cleanup(void);
     65 
     66 int main(int ac, char **av)
     67 {
     68 	int lc;
     69 	int pid, status, retval;
     70 
     71 	tst_parse_opts(ac, av, NULL, NULL);
     72 
     73 	setup();
     74 
     75 	/* Check for looping state if -i option is given */
     76 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     77 		/* reset tst_count in case we are looping */
     78 		tst_count = 0;
     79 
     80 		if ((pid = FORK_OR_VFORK()) == -1) {
     81 			tst_brkm(TBROK, cleanup, "Could not fork");
     82 		}
     83 
     84 		if (pid == 0) {
     85 			retval = 0;
     86 
     87 			if (chroot(tst_get_tmpdir()) == -1) {
     88 				perror("chroot failed");
     89 				retval = 1;
     90 			} else {
     91 				if (stat("/" TMP_FILENAME, &buf) == -1) {
     92 					retval = 1;
     93 					perror("stat failed");
     94 				}
     95 			}
     96 
     97 			exit(retval);
     98 		}
     99 
    100 		/* parent */
    101 		wait(&status);
    102 		/* make sure the child returned a good exit status */
    103 		if (WIFSIGNALED(status) ||
    104 		    (WIFEXITED(status) && WEXITSTATUS(status) != 0))
    105 			tst_resm(TFAIL, "chroot functionality incorrect");
    106 		else
    107 			tst_resm(TPASS, "chroot functionality correct");
    108 	}
    109 
    110 	cleanup();
    111 	tst_exit();
    112 
    113 }
    114 
    115 /*
    116  * setup() - performs all ONE TIME setup for this test.
    117  */
    118 void setup(void)
    119 {
    120 	tst_require_root();
    121 
    122 	tst_tmpdir();
    123 	if ((fileHandle = creat(TMP_FILENAME, 0777)) == -1)
    124 		tst_brkm(TBROK, cleanup, "failed to create temporary file "
    125 			 TMP_FILENAME);
    126 	if (stat(TMP_FILENAME, &buf) != 0)
    127 		tst_brkm(TBROK, cleanup, TMP_FILENAME " does not exist");
    128 
    129 	tst_sig(FORK, DEF_HANDLER, cleanup);
    130 
    131 	TEST_PAUSE;
    132 }
    133 
    134 /*
    135  * cleanup() - performs all ONE TIME cleanup for this test at
    136  *	       completion or premature exit.
    137  */
    138 void cleanup(void)
    139 {
    140 	/*
    141 	 * print timing stats if that option was specified.
    142 	 * print errno log if that option was specified.
    143 	 */
    144 	close(fileHandle);
    145 
    146 	tst_rmdir();
    147 
    148 }
    149