1 /*
2  * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of version 2 of the GNU General Public License as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it would be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11  *
12  * You should have received a copy of the GNU General Public License
13  * along with this program;  if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15  *
16  */
17 /**********************************************************
18  *
19  *    TEST IDENTIFIER   : setdomainname03
20  *
21  *    EXECUTED BY       : root / superuser
22  *
23  *    TEST TITLE        : test for EPERM error value when run as non superuser
24  *
25  *    TEST CASE TOTAL   : 1
26  *
27  *    AUTHOR            : Saji Kumar.V.R <saji.kumar@wipro.com>
28  *
29  *    SIGNALS
30  *      Uses SIGUSR1 to pause before test if option set.
31  *      (See the parse_opts(3) man page).
32  *
33  *    DESCRIPTION
34  * 	Verify that, setdomainname(2) returns -1 and sets errno to EPERM
35  * 	if the effective user id of the caller is not super-user.
36  *
37  * Algorithm:
38  *  Setup:
39  *   Setup signal handling.
40  *   Pause for SIGUSR1 if option specified.
41  *   save current domainname
42  *   change effective user id to "nobody" user
43  *
44  *  Test:
45  *   Loop if the proper options are given.
46  *   Execute system call
47  *   Check return code, Check return code, if (system call failed (return=-1)) &
48  *			(errno set == expected errno)
49  *   		Issue sys call fails with expected return value and errno.
50  *   	Otherwise,
51  *		Issue sys call fails with unexpected errno.
52  *   Otherwise,
53  *	Issue sys call returns unexpected value.
54  *
55  *  Cleanup:
56  *   Change effective user id to root
57  *   Restore old domainname
58  *   Print errno log and/or timing stats if options given
59  *
60  * Usage:  <for command-line>
61  *  setdomainname03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
62  *	where,  -c n : Run n copies concurrently.
63  *		-e   : Turn on errno logging.
64  *		-h   : Show help screen
65  *		-f   : Turn off functional testing
66  *		-i n : Execute test n times.
67  *		-I x : Execute test for x seconds.
68  *		-p   : Pause for SIGUSR1 before starting
69  *		-P x : Pause for x seconds between iterations.
70  *		-t   : Turn on syscall timing.
71  *
72  ****************************************************************/
73 
74 #include <string.h>
75 #include <errno.h>
76 #include <pwd.h>
77 #include <linux/utsname.h>
78 
79 #include "test.h"
80 
81 #define MAX_NAME_LEN __NEW_UTS_LEN
82 
83 char *TCID = "setdomainname03";
84 int TST_TOTAL = 1;
85 
86 static char nobody_uid[] = "nobody";
87 struct passwd *ltpuser;
88 
89 static char test_domain_name[MAX_NAME_LEN] = "test_dom";
90 static char old_domain_name[MAX_NAME_LEN];
91 
92 static void setup();		/* setup function for the tests */
93 static void cleanup();		/* cleanup function for the tests */
94 
95 int main(int ac, char **av)
96 {
97 	int lc;
98 
99 	tst_parse_opts(ac, av, NULL, NULL);
100 
101 	/*
102 	 * Invoke setup function to call individual test setup functions
103 	 * for the test which run as root/super-user.
104 	 */
105 	setup();
106 
107 	for (lc = 0; TEST_LOOPING(lc); lc++) {
108 
109 		tst_count = 0;
110 
111 		/*
112 		 * Call setdomainname(2)
113 		 */
114 		TEST(setdomainname(test_domain_name, MAX_NAME_LEN));
115 		if ((TEST_RETURN == -1) && (TEST_ERRNO == EPERM)) {
116 			tst_resm(TPASS, "expected failure; Got EPERM");
117 		} else {
118 			tst_resm(TFAIL, "Call failed to produce "
119 				 "expected error;  Expected errno: %d "
120 				 "Got : %d, %s", EPERM, TEST_ERRNO,
121 				 strerror(TEST_ERRNO));
122 		}
123 
124 	}
125 
126 	/*
127 	 * Invoke cleanup() to delete the test directories created
128 	 * in the setup().
129 	 */
130 	cleanup();
131 	tst_exit();
132 
133 }
134 
135 /*
136  * setup(void) - performs all ONE TIME setup for this test.
137  */
138 void setup(void)
139 {
140 	tst_require_root();
141 
142 	/* Capture unexpected signals */
143 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
144 
145 	/* Switch to nobody user for correct error code collection */
146 	if ((ltpuser = getpwnam(nobody_uid)) == NULL) {
147 		tst_brkm(TBROK, NULL, "\"nobody\" user not present");
148 	}
149 	if (seteuid(ltpuser->pw_uid) == -1) {
150 		tst_resm(TWARN, "seteuid failed to "
151 			 "to set the effective uid to %d", ltpuser->pw_uid);
152 		perror("seteuid");
153 	}
154 
155 	/* Save current domainname */
156 	if ((getdomainname(old_domain_name, MAX_NAME_LEN)) < 0) {
157 		tst_brkm(TBROK, NULL, "getdomainname() failed while"
158 			 " getting current domain name");
159 	}
160 
161 	TEST_PAUSE;
162 
163 }
164 
165 /*
166  * cleanup() - Performs all ONE TIME cleanup for this test at
167  */
168 void cleanup(void)
169 {
170 
171 	/* Set effective user id back to root */
172 	if (seteuid(0) == -1) {
173 		tst_resm(TWARN, "seteuid failed to "
174 			 "to set the effective uid to root");
175 		perror("seteuid");
176 	}
177 
178 	/* Restore domain name */
179 	if ((setdomainname(old_domain_name, strlen(old_domain_name)))
180 	    < 0) {
181 		tst_resm(TWARN, "setdomainname() failed while restoring"
182 			 " domainname to \"%s\"", old_domain_name);
183 	}
184 
185 }
186