1/*
2 * Copyright (c) International Business Machines  Corp., 2001
3 *
4 * This program is free software;  you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program.
16 */
17
18/*
19 * DESCRIPTION
20 * 1) msgget(2) fails if a message queue exists for key and msgflg
21 *    specified both IPC_CREAT and IPC_EXCL.
22 * 2) msgget(2) fails if no message queue exists for key and msgflg
23 *    did not specify IPC_CREAT.
24 * 3) msgget(2) fails if a message queue exists for key, but the
25 *    calling process does not have permission to access the queue,
26 *    and does not have the CAP_IPC_OWNER capability.
27 *
28 */
29#include <errno.h>
30#include <stdlib.h>
31#include <sys/types.h>
32#include <sys/ipc.h>
33#include <sys/msg.h>
34#include <pwd.h>
35
36#include "tst_test.h"
37#include "tst_safe_sysv_ipc.h"
38#include "libnewipc.h"
39
40static key_t msgkey, msgkey1;
41static int queue_id = -1;
42static struct passwd *pw;
43
44static struct tcase {
45	int *key;
46	int flags;
47	int exp_err;
48	/*1: nobody expected  0: root expected */
49	int exp_user;
50} tcases[] = {
51	{&msgkey, IPC_CREAT | IPC_EXCL, EEXIST, 0},
52	{&msgkey1, IPC_PRIVATE, ENOENT, 0},
53	{&msgkey1, IPC_EXCL, ENOENT, 0},
54	{&msgkey, MSG_RD, EACCES, 1},
55	{&msgkey, MSG_WR, EACCES, 1},
56	{&msgkey, MSG_RW, EACCES, 1}
57};
58
59static void verify_msgget(struct tcase *tc)
60{
61	TEST(msgget(*tc->key, tc->flags));
62
63	if (TEST_RETURN != -1) {
64		tst_res(TFAIL, "msgget() succeeded unexpectedly");
65		return;
66	}
67
68	if (TEST_ERRNO == tc->exp_err) {
69		tst_res(TPASS | TTERRNO, "msgget() failed as expected");
70	} else {
71		tst_res(TFAIL | TTERRNO, "msgget() failed unexpectedly,"
72			" expected %s", tst_strerrno(tc->exp_err));
73	}
74}
75
76static void do_test(unsigned int n)
77{
78	pid_t pid;
79	struct tcase *tc = &tcases[n];
80
81	if (tc->exp_user == 0) {
82		verify_msgget(tc);
83	} else {
84		pid = SAFE_FORK();
85		if (pid) {
86			tst_reap_children();
87		} else {
88			SAFE_SETUID(pw->pw_uid);
89			verify_msgget(tc);
90			exit(0);
91		}
92	}
93}
94
95static void setup(void)
96{
97	msgkey = GETIPCKEY();
98	msgkey1 = GETIPCKEY();
99
100	queue_id = SAFE_MSGGET(msgkey, IPC_CREAT | IPC_EXCL);
101
102	pw = SAFE_GETPWNAM("nobody");
103}
104
105static void cleanup(void)
106{
107	if (queue_id != -1)
108		SAFE_MSGCTL(queue_id, IPC_RMID, NULL);
109}
110
111static struct tst_test test = {
112	.needs_tmpdir = 1,
113	.needs_root = 1,
114	.forks_child = 1,
115	.tcnt = ARRAY_SIZE(tcases),
116	.setup = setup,
117	.cleanup = cleanup,
118	.test = do_test
119};
120