1 #include <stdlib.h>
2 #include <stdio.h>
3 #include <string.h>
4 #include <errno.h>
5 #include <linux/msg.h>
6 #include <fcntl.h>
7
8 #include "../kselftest.h"
9
10 #define MAX_MSG_SIZE 32
11
12 struct msg1 {
13 int msize;
14 long mtype;
15 char mtext[MAX_MSG_SIZE];
16 };
17
18 #define TEST_STRING "Test sysv5 msg"
19 #define MSG_TYPE 1
20
21 #define ANOTHER_TEST_STRING "Yet another test sysv5 msg"
22 #define ANOTHER_MSG_TYPE 26538
23
24 struct msgque_data {
25 key_t key;
26 int msq_id;
27 int qbytes;
28 int qnum;
29 int mode;
30 struct msg1 *messages;
31 };
32
restore_queue(struct msgque_data * msgque)33 int restore_queue(struct msgque_data *msgque)
34 {
35 int fd, ret, id, i;
36 char buf[32];
37
38 fd = open("/proc/sys/kernel/msg_next_id", O_WRONLY);
39 if (fd == -1) {
40 printf("Failed to open /proc/sys/kernel/msg_next_id\n");
41 return -errno;
42 }
43 sprintf(buf, "%d", msgque->msq_id);
44
45 ret = write(fd, buf, strlen(buf));
46 if (ret != strlen(buf)) {
47 printf("Failed to write to /proc/sys/kernel/msg_next_id\n");
48 return -errno;
49 }
50
51 id = msgget(msgque->key, msgque->mode | IPC_CREAT | IPC_EXCL);
52 if (id == -1) {
53 printf("Failed to create queue\n");
54 return -errno;
55 }
56
57 if (id != msgque->msq_id) {
58 printf("Restored queue has wrong id (%d instead of %d)\n",
59 id, msgque->msq_id);
60 ret = -EFAULT;
61 goto destroy;
62 }
63
64 for (i = 0; i < msgque->qnum; i++) {
65 if (msgsnd(msgque->msq_id, &msgque->messages[i].mtype,
66 msgque->messages[i].msize, IPC_NOWAIT) != 0) {
67 printf("msgsnd failed (%m)\n");
68 ret = -errno;
69 goto destroy;
70 };
71 }
72 return 0;
73
74 destroy:
75 if (msgctl(id, IPC_RMID, 0))
76 printf("Failed to destroy queue: %d\n", -errno);
77 return ret;
78 }
79
check_and_destroy_queue(struct msgque_data * msgque)80 int check_and_destroy_queue(struct msgque_data *msgque)
81 {
82 struct msg1 message;
83 int cnt = 0, ret;
84
85 while (1) {
86 ret = msgrcv(msgque->msq_id, &message.mtype, MAX_MSG_SIZE,
87 0, IPC_NOWAIT);
88 if (ret < 0) {
89 if (errno == ENOMSG)
90 break;
91 printf("Failed to read IPC message: %m\n");
92 ret = -errno;
93 goto err;
94 }
95 if (ret != msgque->messages[cnt].msize) {
96 printf("Wrong message size: %d (expected %d)\n", ret,
97 msgque->messages[cnt].msize);
98 ret = -EINVAL;
99 goto err;
100 }
101 if (message.mtype != msgque->messages[cnt].mtype) {
102 printf("Wrong message type\n");
103 ret = -EINVAL;
104 goto err;
105 }
106 if (memcmp(message.mtext, msgque->messages[cnt].mtext, ret)) {
107 printf("Wrong message content\n");
108 ret = -EINVAL;
109 goto err;
110 }
111 cnt++;
112 }
113
114 if (cnt != msgque->qnum) {
115 printf("Wrong message number\n");
116 ret = -EINVAL;
117 goto err;
118 }
119
120 ret = 0;
121 err:
122 if (msgctl(msgque->msq_id, IPC_RMID, 0)) {
123 printf("Failed to destroy queue: %d\n", -errno);
124 return -errno;
125 }
126 return ret;
127 }
128
dump_queue(struct msgque_data * msgque)129 int dump_queue(struct msgque_data *msgque)
130 {
131 struct msqid64_ds ds;
132 int kern_id;
133 int i, ret;
134
135 for (kern_id = 0; kern_id < 256; kern_id++) {
136 ret = msgctl(kern_id, MSG_STAT, &ds);
137 if (ret < 0) {
138 if (errno == -EINVAL)
139 continue;
140 printf("Failed to get stats for IPC queue with id %d\n",
141 kern_id);
142 return -errno;
143 }
144
145 if (ret == msgque->msq_id)
146 break;
147 }
148
149 msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum);
150 if (msgque->messages == NULL) {
151 printf("Failed to get stats for IPC queue\n");
152 return -ENOMEM;
153 }
154
155 msgque->qnum = ds.msg_qnum;
156 msgque->mode = ds.msg_perm.mode;
157 msgque->qbytes = ds.msg_qbytes;
158
159 for (i = 0; i < msgque->qnum; i++) {
160 ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
161 MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
162 if (ret < 0) {
163 printf("Failed to copy IPC message: %m (%d)\n", errno);
164 return -errno;
165 }
166 msgque->messages[i].msize = ret;
167 }
168 return 0;
169 }
170
fill_msgque(struct msgque_data * msgque)171 int fill_msgque(struct msgque_data *msgque)
172 {
173 struct msg1 msgbuf;
174
175 msgbuf.mtype = MSG_TYPE;
176 memcpy(msgbuf.mtext, TEST_STRING, sizeof(TEST_STRING));
177 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(TEST_STRING),
178 IPC_NOWAIT) != 0) {
179 printf("First message send failed (%m)\n");
180 return -errno;
181 };
182
183 msgbuf.mtype = ANOTHER_MSG_TYPE;
184 memcpy(msgbuf.mtext, ANOTHER_TEST_STRING, sizeof(ANOTHER_TEST_STRING));
185 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(ANOTHER_TEST_STRING),
186 IPC_NOWAIT) != 0) {
187 printf("Second message send failed (%m)\n");
188 return -errno;
189 };
190 return 0;
191 }
192
main(int argc,char ** argv)193 int main(int argc, char **argv)
194 {
195 int msg, pid, err;
196 struct msgque_data msgque;
197
198 if (getuid() != 0) {
199 printf("Please run the test as root - Exiting.\n");
200 return ksft_exit_fail();
201 }
202
203 msgque.key = ftok(argv[0], 822155650);
204 if (msgque.key == -1) {
205 printf("Can't make key: %d\n", -errno);
206 return ksft_exit_fail();
207 }
208
209 msgque.msq_id = msgget(msgque.key, IPC_CREAT | IPC_EXCL | 0666);
210 if (msgque.msq_id == -1) {
211 err = -errno;
212 printf("Can't create queue: %d\n", err);
213 goto err_out;
214 }
215
216 err = fill_msgque(&msgque);
217 if (err) {
218 printf("Failed to fill queue: %d\n", err);
219 goto err_destroy;
220 }
221
222 err = dump_queue(&msgque);
223 if (err) {
224 printf("Failed to dump queue: %d\n", err);
225 goto err_destroy;
226 }
227
228 err = check_and_destroy_queue(&msgque);
229 if (err) {
230 printf("Failed to check and destroy queue: %d\n", err);
231 goto err_out;
232 }
233
234 err = restore_queue(&msgque);
235 if (err) {
236 printf("Failed to restore queue: %d\n", err);
237 goto err_destroy;
238 }
239
240 err = check_and_destroy_queue(&msgque);
241 if (err) {
242 printf("Failed to test queue: %d\n", err);
243 goto err_out;
244 }
245 return ksft_exit_pass();
246
247 err_destroy:
248 if (msgctl(msgque.msq_id, IPC_RMID, 0)) {
249 printf("Failed to destroy queue: %d\n", -errno);
250 return ksft_exit_fail();
251 }
252 err_out:
253 return ksft_exit_fail();
254 }
255