| /* |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| /* |
| * Test Name : readlink04 |
| * |
| * Test Description : |
| * Verify that, readlink call will succeed to read the contents of the |
| * symbolic link if invoked by non-root user who is not the owner of the |
| * symbolic link. |
| * |
| * Expected Result: |
| * readlink() should return the contents of symbolic link path in the |
| * specified buffer on success. |
| * |
| * Algorithm: |
| * Setup: |
| * Setup signal handling. |
| * Create temporary directory. |
| * Pause for SIGUSR1 if option specified. |
| * |
| * Test: |
| * Loop if the proper options are given. |
| * Execute system call |
| * Check return code, if system call failed (return=-1) |
| * if errno set == expected errno |
| * Issue sys call fails with expected return value and errno. |
| * Otherwise, |
| * Issue sys call fails with unexpected errno. |
| * Otherwise, |
| * Issue sys call returns unexpected value. |
| * |
| * Cleanup: |
| * Print errno log and/or timing stats if options given |
| * Delete the temporary directory(s)/file(s) created. |
| * |
| * Usage: <for command-line> |
| * readlink04 [-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 Ported by Wayne Boyer |
| * |
| * RESTRICTIONS: |
| * This test should be executed by 'super-user' only. |
| */ |
| #include <stdlib.h> |
| #include <pwd.h> |
| #include <sys/types.h> |
| #include <sys/fcntl.h> |
| #include <errno.h> |
| #include <string.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| char TESTFILE[] = "testfile \0"; /* name of file to create */ |
| char SYMFILE[] = "/slink_file\0"; /* name of symbolic link to create */ |
| char creat_slink[] = "creat_slink\0"; /* name of executable to execvp() */ |
| |
| char nobody[] = "nobody"; |
| char bin[] = "bin"; |
| |
| #define MAX_SIZE 256 |
| |
| char *TCID="readlink04"; /* Test program identifier. */ |
| int TST_TOTAL=1; /* Total number of test cases. */ |
| extern int Tst_count; /* Test Case counter for tst_* routines */ |
| |
| char *symfile_path; |
| int exp_val; /* strlen of testfile */ |
| char buffer[MAX_SIZE]; /* temporary buffer to hold symlink contents*/ |
| |
| void setup(); /* Setup function for the test */ |
| void cleanup(); /* Cleanup function for the test */ |
| |
| int |
| main(int ac, char **av) |
| { |
| int lc; /* loop counter */ |
| char *msg; /* message returned from parse_opts */ |
| |
| /* Parse standard options given to run the test. */ |
| msg = parse_opts(ac, av, (option_t *)NULL, NULL); |
| if (msg != (char *)NULL) { |
| tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg); |
| } |
| |
| /* Perform global setup for test */ |
| setup(); |
| |
| /* Check looping state if -i option given */ |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| /* Reset Tst_count in case we are looping. */ |
| Tst_count=0; |
| |
| /* |
| * Call readlink(2) to read the contents of |
| * symlink into a buffer. |
| */ |
| TEST(readlink(symfile_path, buffer, sizeof(buffer))); |
| |
| /* Check return code of readlink(2) */ |
| if (TEST_RETURN == -1) { |
| tst_resm(TFAIL, "readlink() on %s failed, errno=%d : " |
| "%s", symfile_path, TEST_ERRNO, |
| strerror(TEST_ERRNO)); |
| continue; |
| } |
| |
| /* |
| * Perform functional verification if test |
| * executed without (-f) option. |
| */ |
| if (STD_FUNCTIONAL_TEST) { |
| /* |
| * Compare the return value of readlink() |
| * with the expected value which is the |
| * strlen() of testfile. |
| */ |
| if (TEST_RETURN == exp_val) { |
| /* Check for the contents of buffer */ |
| if (memcmp(buffer, TESTFILE, exp_val) != 0) { |
| tst_brkm(TFAIL, cleanup, "TESTFILE %s " |
| "and buffer contents %s " |
| "differ", TESTFILE, buffer); |
| } else { |
| tst_resm(TPASS, "readlink() " |
| "functionality on '%s' is " |
| "correct", SYMFILE); |
| } |
| } else { |
| tst_resm(TFAIL, "readlink() return value %d " |
| "doesn't match, Expected %d", |
| TEST_RETURN, exp_val); |
| } |
| } else { |
| tst_resm(TPASS, "call succeeded"); |
| } |
| } /* End for TEST_LOOPING */ |
| /* Call cleanup() to undo setup done for the test. */ |
| cleanup(); |
| |
| /*NOTREACHED*/ |
| } /* End main */ |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test. |
| * |
| * Create a temporary directory and change directory to it. |
| * |
| * execvp() the creat_slink program as bin to creat a file and symlink. |
| */ |
| void |
| setup() |
| { |
| int pid; |
| char *tmp_dir = NULL; |
| char path_buffer[BUFSIZ]; /* Buffer to hold command string */ |
| char *cargv[4]; |
| char *bin_dir; |
| struct passwd *pwent; |
| |
| /* Check that the test process id is super/root */ |
| if (geteuid() != 0) { |
| tst_brkm(TBROK, tst_exit, "Must be root for this test!"); |
| } |
| |
| /* capture signals */ |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* Pause if that option was specified */ |
| TEST_PAUSE; |
| |
| bin_dir=(char *)get_current_dir_name(); |
| |
| /* make a temp directory and cd to it */ |
| tst_tmpdir(); |
| |
| /* get the name of the temporary directory */ |
| if ((tmp_dir = getcwd(tmp_dir, 0)) == NULL) { |
| tst_brkm(TBROK, tst_exit, "getcwd failed"); |
| } |
| |
| if ((pwent = getpwnam("bin")) == NULL) { |
| tst_brkm(TBROK, cleanup, "getpwname() failed"); |
| } |
| |
| /* make the tmp directory belong to bin */ |
| if (chown(tmp_dir, pwent->pw_uid, pwent->pw_gid) == -1) { |
| tst_brkm(TBROK, cleanup, "chown() failed"); |
| } |
| |
| if (chmod(tmp_dir, 0711) != 0) { |
| tst_brkm(TBROK, cleanup, "chmod() failed"); |
| } |
| |
| /* create the full pathname of the executable to be execvp'ed */ |
| strcat((char *)path_buffer, (char *)bin_dir); |
| |
| symfile_path = "slink_file\0"; |
| |
| /* set up the argument vector to pass into the execvp call */ |
| cargv[0] = tmp_dir; |
| cargv[1] = TESTFILE; |
| cargv[2] = symfile_path; |
| cargv[3] = NULL; |
| |
| if ((pid = fork()) == -1) { |
| tst_brkm(TBROK, cleanup, "fork failed"); |
| } |
| |
| if (pid == 0) { /* child */ |
| /* |
| * execvp the process/program that will create the test file |
| * and set up the symlink |
| */ |
| execvp(creat_slink, cargv); |
| |
| /* on success, execvp will not return */ |
| perror("execvp"); |
| tst_brkm(TBROK, NULL, "execvp() failed"); |
| |
| /* |
| * In reality, the contents/functionality of the creat_slink |
| * program could be included right here. This would simplify |
| * the test a bit. For now, however, we'll leave it as is. |
| */ |
| } |
| |
| /* parent */ |
| |
| /* sleep briefly to let the execvp'ed process do its work */ |
| |
| usleep(25000); |
| |
| /* set up the expected return value from the readlink() call */ |
| exp_val = strlen(TESTFILE); |
| |
| /* fill the buffer with a known value */ |
| (void)memset(buffer, 0, MAX_SIZE); |
| |
| /* finally, change the id of the parent process to "nobody" */ |
| if ((pwent = getpwnam("nobody")) == NULL) { |
| tst_brkm(TBROK, cleanup, "getpwname() failed for nobody"); |
| } |
| |
| if (seteuid(pwent->pw_uid) == -1) { |
| tst_brkm(TBROK, cleanup, "seteuid() failed for nobody"); |
| } |
| } |
| |
| /* |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit. |
| * |
| * Remove the test directory and testfile created in the setup. |
| */ |
| void |
| cleanup() |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| TEST_CLEANUP; |
| |
| /* set the process id back to root in order to remove the tmp dir */ |
| if (seteuid(0) == -1) { |
| tst_brkm(TBROK, NULL, "failed to set process id to root"); |
| } |
| |
| /* Remove tmp dir and all files in it */ |
| tst_rmdir(); |
| |
| /* exit with return code appropriate for results */ |
| tst_exit(); |
| } |