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 * Test Name: getresuid02
22 *
23 * Test Description:
24 *  Verify that getresuid() will be successful to get the real, effective
25 *  and saved user ids after calling process invokes setreuid() to change
26 *  the effective/saved uids to that of specified user.
27 * $
28 * Expected Result:
29 *  getresuid() should return with 0 value and the real/effective/saved
30 *  user ids should match the expected values.
31 *
32 * Algorithm:
33 *  Setup:
34 *   Setup signal handling.
35 *   Pause for SIGUSR1 if option specified.
36 *
37 *  Test:
38 *   Loop if the proper options are given.
39 *   Execute system call
40 *   Check return code, if system call failed (return=-1)
41 *   	Log the errno and Issue a FAIL message.
42 *   Otherwise,
43 *   	Verify the Functionality of system call
44 *      if successful,
45 *      	Issue Functionality-Pass message.
46 *      Otherwise,
47 *		Issue Functionality-Fail message.
48 *  Cleanup:
49 *   Print errno log and/or timing stats if options given
50 *
51 * Usage:  <for command-line>
52 *  getresuid02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
53 *     where,  -c n : Run n copies concurrently.
54 *             -f   : Turn off functionality Testing.
55 *	       -i n : Execute test n times.
56 *	       -I x : Execute test for x seconds.
57 *	       -P x : Pause for x seconds between iterations.
58 *	       -t   : Turn on syscall timing.
59 *
60 * HISTORY
61 *	07/2001 Ported by Wayne Boyer
62 *
63 * RESTRICTIONS:
64 *  This test should be run by 'super-user' (root) only.
65 *
66 */
67
68#include <stdio.h>
69#include <unistd.h>
70#include <sys/types.h>
71#include <errno.h>
72#include <fcntl.h>
73#include <string.h>
74#include <signal.h>
75#include <pwd.h>
76
77#include "test.h"
78#include "compat_16.h"
79
80#define LTPUSER		"nobody"
81
82char *TCID = "getresuid02";
83int TST_TOTAL = 1;
84UID_T pr_uid, pe_uid, ps_uid;	/* calling process real/effective/saved uid */
85
86void setup();			/* Main setup function of test */
87void cleanup();			/* cleanup function for the test */
88
89int main(int ac, char **av)
90{
91	int lc;
92	UID_T real_uid,		/* real/eff./saved user id from getresuid() */
93	 eff_uid, sav_uid;
94
95	tst_parse_opts(ac, av, NULL, NULL);
96
97	setup();
98
99	for (lc = 0; TEST_LOOPING(lc); lc++) {
100
101		tst_count = 0;
102
103		/*
104		 * Call getresuid() to get the real/effective/saved
105		 * user id's of the calling process after
106		 * setreuid() in setup.
107		 */
108		TEST(GETRESUID(cleanup, &real_uid, &eff_uid, &sav_uid));
109
110		if (TEST_RETURN == -1) {
111			tst_resm(TFAIL, "getresuid() Failed, errno=%d : %s",
112				 TEST_ERRNO, strerror(TEST_ERRNO));
113			continue;
114		}
115
116		if ((real_uid != pr_uid) || (eff_uid != pe_uid) ||
117		    (sav_uid != ps_uid)) {
118			tst_resm(TFAIL, "real:%d, effective:%d, "
119				 "saved-user:%d ids differ",
120				 real_uid, eff_uid, sav_uid);
121		} else {
122			tst_resm(TPASS, "Functionality of getresuid() "
123				 "successful");
124		}
125	}
126
127	cleanup();
128	tst_exit();
129}
130
131/*
132 * void
133 * setup() - performs all ONE TIME setup for this test.
134 *	     Get the real/effective/saved user id of the calling process.
135 */
136void setup(void)
137{
138	struct passwd *user_id;	/* passwd struct for test user */
139
140	tst_require_root();
141
142	tst_sig(NOFORK, DEF_HANDLER, cleanup);
143
144	TEST_PAUSE;
145
146	/* Real user-id of the calling process */
147	pr_uid = getuid();
148
149	/* Get effective uid of LTPUSER user from passwd file */
150	if ((user_id = getpwnam(LTPUSER)) == NULL) {
151		tst_brkm(TBROK, cleanup, "getpwnam(%s) Failed", LTPUSER);
152	}
153
154	/* Effective user-id of the test-user LTPUSER */
155	pe_uid = user_id->pw_uid;
156
157	/* Saved user-id of the test-user LTPUSER */
158	ps_uid = user_id->pw_uid;
159
160	/*
161	 * Set the effective user-id of the process to that of
162	 * test user LTPUSER
163	 * The real user id remains same as of caller.
164	 */
165	if (setreuid(-1, ps_uid) < 0) {
166		tst_brkm(TBROK, cleanup,
167			 "setreuid(-1, %d) Fails, errno:%d : %s",
168			 ps_uid, errno, strerror(errno));
169	}
170}
171
172/*
173 * void
174 * cleanup() - performs all ONE TIME cleanup for this test at
175 *             completion or premature exit.
176 *	       Restore the test process uid to root.
177 */
178void cleanup(void)
179{
180
181	/* Reset the effective/saved uid of the calling process */
182	if (setreuid(-1, pr_uid) < 0) {
183		tst_brkm(TBROK, NULL, "resetting process effective uid failed");
184	}
185
186}
187