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: getresgid02
22 *
23 * Test Description:
24 *  Verify that getresgid() will be successful to get the real, effective
25 *  and saved user ids after calling process invokes setregid() to change
26 *  the effective/saved gids to that of specified user.
27 *
28 * Expected Result:
29 *  getresgid() 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 *  getresgid02 [-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
79#define LTPUSER		"nobody"
80
81extern int getresgid(gid_t *, gid_t *, gid_t *);
82
83char *TCID = "getresgid02";
84int TST_TOTAL = 1;
85gid_t pr_gid, pe_gid, ps_gid;	/* calling process real/effective/saved gid */
86
87void setup();			/* Main setup function of test */
88void cleanup();			/* cleanup function for the test */
89
90int main(int ac, char **av)
91{
92	int lc;
93	gid_t real_gid,		/* real/eff./saved user id from getresgid() */
94	 eff_gid, sav_gid;
95
96	tst_parse_opts(ac, av, NULL, NULL);
97
98	setup();
99
100	for (lc = 0; TEST_LOOPING(lc); lc++) {
101
102		tst_count = 0;
103
104		/*
105		 * Call getresgid() to get the real/effective/saved
106		 * user id's of the calling process after
107		 * setregid() in setup.
108		 */
109		TEST(getresgid(&real_gid, &eff_gid, &sav_gid));
110
111		if (TEST_RETURN == -1) {
112			tst_resm(TFAIL, "getresgid() Failed, errno=%d : %s",
113				 TEST_ERRNO, strerror(TEST_ERRNO));
114			continue;
115		}
116		/*
117		 * Verify the real/effective/saved gid
118		 * values returned by getresgid with the
119		 * expected values.
120		 */
121		if ((real_gid != pr_gid) || (eff_gid != pe_gid) ||
122		    (sav_gid != ps_gid)) {
123			tst_resm(TFAIL, "real:%d, effective:%d, "
124				 "saved-user:%d ids differ",
125				 real_gid, eff_gid, sav_gid);
126		} else {
127			tst_resm(TPASS, "Functionality of getresgid() "
128				 "successful");
129		}
130	}
131
132	cleanup();
133	tst_exit();
134}
135
136/*
137 * setup() - performs all ONE TIME setup for this test.
138 *	     Get the real/effective/saved user id of the calling process.
139 */
140void setup(void)
141{
142	struct passwd *user_id;	/* passwd struct for test user */
143
144	tst_require_root();
145
146	tst_sig(NOFORK, DEF_HANDLER, cleanup);
147
148	TEST_PAUSE;
149
150	/* Real user-id of the calling process */
151	pr_gid = getgid();
152
153	/* Get effective gid of LTPUSER user from passwd file */
154	if ((user_id = getpwnam(LTPUSER)) == NULL) {
155		tst_brkm(TBROK, cleanup, "getpwnam(%s) Failed", LTPUSER);
156	}
157
158	/* Effective user-id of the test-user LTPUSER */
159	pe_gid = user_id->pw_gid;
160
161	/* Saved user-id of the test-user LTPUSER */
162	ps_gid = user_id->pw_gid;
163
164	/*
165	 * Set the effective user-id of the process to that of
166	 * test user LTPUSER
167	 * The real user id remains same as of caller.
168	 */
169	if (setregid(-1, ps_gid) < 0) {
170		tst_brkm(TBROK, cleanup,
171			 "setregid(-1, %d) Fails, errno:%d : %s",
172			 ps_gid, errno, strerror(errno));
173	}
174}
175
176/*
177 * cleanup() - performs all ONE TIME cleanup for this test at
178 *             completion or premature exit.
179 *	       Restore the test process gid to root.
180 */
181void cleanup(void)
182{
183
184	/* Reset the effective/saved gid of the calling process */
185	if (setregid(-1, pr_gid) < 0) {
186		tst_brkm(TBROK, NULL, "resetting process effective gid failed");
187	}
188
189}
190