1 /*-
2 * Copyright (c) 1999 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
7 * NASA Ames Research Center.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 *
30 * Obtained from: $NetBSD: shmtest.c,v 1.3 2002/07/20 08:36:26 grant Exp $
31 * $FreeBSD: stable/12/tools/regression/sysvshm/shmtest.c 280232 2015-03-18 22:05:15Z kib $
32 */
33
34 /*
35 * Test the SVID-compatible Shared Memory facility.
36 */
37
38 #include <sys/types.h>
39 #include <sys/ipc.h>
40 #include <sys/shm.h>
41 #include <sys/wait.h>
42
43 #include <err.h>
44 #include <errno.h>
45 #include <signal.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <time.h>
50 #include <unistd.h>
51
52 static void print_shmid_ds(struct shmid_ds *, mode_t);
53 static void sigsys_handler(int);
54 static void sigchld_handler(int);
55 static void cleanup(void);
56 static void receiver(void);
57 static void usage(void);
58
59 static const char *m_str = "The quick brown fox jumped over the lazy dog.";
60
61 static int sender_shmid = -1;
62 static pid_t child_pid;
63 static key_t shmkey;
64 static size_t pgsize;
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 struct sigaction sa;
70 struct shmid_ds s_ds;
71 sigset_t sigmask;
72 char *shm_buf;
73
74 if (argc != 2)
75 usage();
76
77 /*
78 * Install a SIGSYS handler so that we can exit gracefully if
79 * System V Shared Memory support isn't in the kernel.
80 */
81 sa.sa_handler = sigsys_handler;
82 sigemptyset(&sa.sa_mask);
83 sa.sa_flags = 0;
84 if (sigaction(SIGSYS, &sa, NULL) == -1)
85 err(1, "sigaction SIGSYS");
86
87 /*
88 * Install and SIGCHLD handler to deal with all possible exit
89 * conditions of the receiver.
90 */
91 sa.sa_handler = sigchld_handler;
92 sigemptyset(&sa.sa_mask);
93 sa.sa_flags = 0;
94 if (sigaction(SIGCHLD, &sa, NULL) == -1)
95 err(1, "sigaction SIGCHLD");
96
97 pgsize = sysconf(_SC_PAGESIZE);
98
99 shmkey = ftok(argv[1], 4160);
100
101 /*
102 * Initialize child_pid to ourselves to that the cleanup function
103 * works before we create the receiver.
104 */
105 child_pid = getpid();
106
107 /*
108 * Make sure that when the sender exits, the message queue is
109 * removed.
110 */
111 if (atexit(cleanup) == -1)
112 err(1, "atexit");
113
114 if ((sender_shmid = shmget(shmkey, pgsize, IPC_CREAT | 0640)) == -1)
115 err(1, "shmget");
116
117 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
118 err(1, "shmctl IPC_STAT");
119
120 print_shmid_ds(&s_ds, 0640);
121
122 s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;
123
124 if (shmctl(sender_shmid, IPC_SET, &s_ds) == -1)
125 err(1, "shmctl IPC_SET");
126
127 memset(&s_ds, 0, sizeof(s_ds));
128
129 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
130 err(1, "shmctl IPC_STAT");
131
132 if ((s_ds.shm_perm.mode & 0777) != 0600)
133 err(1, "IPC_SET of mode didn't hold");
134
135 print_shmid_ds(&s_ds, 0600);
136
137 if ((shm_buf = shmat(sender_shmid, NULL, 0)) == (void *) -1)
138 err(1, "sender: shmat");
139
140 /*
141 * Write the test pattern into the shared memory buffer.
142 */
143 strcpy(shm_buf, m_str);
144
145 switch ((child_pid = fork())) {
146 case -1:
147 err(1, "fork");
148 /* NOTREACHED */
149
150 case 0:
151 receiver();
152 break;
153
154 default:
155 break;
156 }
157
158 /*
159 * Suspend forever; when we get SIGCHLD, the handler will exit.
160 */
161 sigemptyset(&sigmask);
162 (void) sigsuspend(&sigmask);
163
164 /*
165 * ...and any other signal is an unexpected error.
166 */
167 errx(1, "sender: received unexpected signal");
168 }
169
170 static void
sigsys_handler(int signo __unused)171 sigsys_handler(int signo __unused)
172 {
173
174 errx(1, "System V Shared Memory support is not present in the kernel");
175 }
176
177 static void
sigchld_handler(int signo __unused)178 sigchld_handler(int signo __unused)
179 {
180 struct shmid_ds s_ds;
181 int cstatus;
182
183 /*
184 * Reap the child; if it exited successfully, then the test passed!
185 */
186 if (waitpid(child_pid, &cstatus, 0) != child_pid)
187 err(1, "waitpid");
188
189 if (WIFEXITED(cstatus) == 0)
190 errx(1, "receiver exited abnormally");
191
192 if (WEXITSTATUS(cstatus) != 0)
193 errx(1, "receiver exited with status %d",
194 WEXITSTATUS(cstatus));
195
196 /*
197 * If we get here, the child has exited normally, and thus
198 * we should exit normally too. First, tho, we print out
199 * the final stats for the message queue.
200 */
201
202 if (shmctl(sender_shmid, IPC_STAT, &s_ds) == -1)
203 err(1, "shmctl IPC_STAT");
204
205 print_shmid_ds(&s_ds, 0600);
206
207 exit(0);
208 }
209
210 static void
cleanup(void)211 cleanup(void)
212 {
213
214 /*
215 * If we're the sender, and it exists, remove the shared memory area.
216 */
217 if (child_pid != 0 && sender_shmid != -1) {
218 if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
219 warn("shmctl IPC_RMID");
220 }
221 }
222
223 static void
print_shmid_ds(struct shmid_ds * sp,mode_t mode)224 print_shmid_ds(struct shmid_ds *sp, mode_t mode)
225 {
226 uid_t uid = geteuid();
227 gid_t gid = getegid();
228
229 printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
230 sp->shm_perm.uid, sp->shm_perm.gid,
231 sp->shm_perm.cuid, sp->shm_perm.cgid,
232 sp->shm_perm.mode & 0777);
233
234 printf("segsz %lu, lpid %d, cpid %d, nattch %u\n",
235 (u_long)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
236 sp->shm_nattch);
237
238 printf("atime: %s", ctime(&sp->shm_atime));
239 printf("dtime: %s", ctime(&sp->shm_dtime));
240 printf("ctime: %s", ctime(&sp->shm_ctime));
241
242 /*
243 * Sanity check a few things.
244 */
245
246 if (sp->shm_perm.uid != uid || sp->shm_perm.cuid != uid)
247 errx(1, "uid mismatch");
248
249 if (sp->shm_perm.gid != gid || sp->shm_perm.cgid != gid)
250 errx(1, "gid mismatch");
251
252 if ((sp->shm_perm.mode & 0777) != mode)
253 errx(1, "mode mismatch");
254 }
255
256 static void
usage(void)257 usage(void)
258 {
259
260 fprintf(stderr, "usage: %s keypath\n", getprogname());
261 exit(1);
262 }
263
264 static void
receiver(void)265 receiver(void)
266 {
267 int shmid;
268 void *shm_buf;
269
270 if ((shmid = shmget(shmkey, pgsize, 0)) == -1)
271 err(1, "receiver: shmget");
272
273 if ((shm_buf = shmat(shmid, NULL, 0)) == (void *) -1)
274 err(1, "receiver: shmat");
275
276 printf("%s\n", (const char *)shm_buf);
277 if (strcmp((const char *)shm_buf, m_str) != 0)
278 err(1, "receiver: data isn't correct");
279
280 exit(0);
281 }
282