1 /*-
2 * Copyright (c) 2004 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/param.h>
28 #include <sys/socket.h>
29 #include <sys/wait.h>
30
31 #include <netinet/in.h>
32
33 #include <err.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <signal.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41
42 #define BIND_ATTEMPTS 10
43 #define LOOPS 500
44 #define NUM_ATTEMPTS 1000
45
46 static volatile int quit;
47
48 static void
child_died(int sig __unused)49 child_died(int sig __unused)
50 {
51
52 quit = 1;
53 }
54
55 /*
56 * This test is intended to detect a leak of a file descriptor in the process
57 * following a failed non-blocking accept. It measures an available fd
58 * baseline, then performs 1000 failing accepts, then checks to see what the
59 * next fd is. It relies on sequential fd allocation, and will test for it
60 * briefly before beginning (not 100% reliable, but a good start).
61 */
62 int
main(void)63 main(void)
64 {
65 struct sockaddr_in sin;
66 socklen_t size;
67 pid_t child;
68 int fd1, fd2, fd3, i, listen_port, s, status;
69
70 printf("1..2\n");
71
72 /*
73 * Check for sequential fd allocation, and give up early if not.
74 */
75 fd1 = dup(STDIN_FILENO);
76 fd2 = dup(STDIN_FILENO);
77 if (fd2 != fd1 + 1)
78 errx(-1, "Non-sequential fd allocation\n");
79
80 s = socket(PF_INET, SOCK_STREAM, 0);
81 if (s == -1)
82 errx(-1, "socket: %s", strerror(errno));
83
84 bzero(&sin, sizeof(sin));
85 sin.sin_len = sizeof(sin);
86 sin.sin_family = AF_INET;
87 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
88
89 srandomdev();
90
91 for (i = 0; i < BIND_ATTEMPTS; i++) {
92 /* Pick a random unprivileged port 1025-65535 */
93 listen_port = MAX((int)random() % 65535, 1025);
94 sin.sin_port = htons(listen_port);
95 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0)
96 break;
97 warn("bind with %d failed", listen_port);
98 usleep(1000);
99 }
100 if (i >= BIND_ATTEMPTS) {
101 printf("Bail out!\n");
102 exit(1);
103 }
104
105 if (listen(s, -1) != 0)
106 errx(-1, "listen: %s", strerror(errno));
107
108 i = fcntl(s, F_GETFL);
109 if (i == -1)
110 errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
111 i |= O_NONBLOCK;
112 if (fcntl(s, F_SETFL, i) != 0)
113 errx(-1, "ioctl(F_SETFL): %s", strerror(errno));
114 i = fcntl(s, F_GETFL);
115 if (i == -1)
116 errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
117 if ((i & O_NONBLOCK) != O_NONBLOCK)
118 errx(-1, "Failed to set O_NONBLOCK (i=0x%x)\n", i);
119
120 for (i = 0; i < LOOPS; i++) {
121 size = sizeof(sin);
122 if (accept(s, (struct sockaddr *)&sin, &size) != -1)
123 errx(-1, "accept succeeded\n");
124 if (errno != EAGAIN)
125 errx(-1, "accept: %s", strerror(errno));
126 }
127
128 /*
129 * Allocate a file descriptor and make sure it's fd2+2. 2 because
130 * we allocate an fd for the socket.
131 */
132 fd3 = dup(STDIN_FILENO);
133 if (fd3 != fd2 + 2)
134 printf("not ok 1 - (%d, %d, %d)\n", fd1, fd2, fd3);
135 else
136 printf("ok 1\n");
137
138 /*
139 * Try failing accept's w/o non-blocking where the destination
140 * address pointer is invalid.
141 */
142 close(fd3);
143 signal(SIGCHLD, child_died);
144 child = fork();
145 if (child < 0)
146 errx(-1, "fork: %s", strerror(errno));
147
148 /*
149 * Child process does `NUM_ATTEMPTS` connects.
150 */
151 if (child == 0) {
152 close(fd1);
153 close(fd2);
154 close(s);
155
156 bzero(&sin, sizeof(sin));
157 sin.sin_len = sizeof(sin);
158 sin.sin_family = AF_INET;
159 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
160 sin.sin_port = htons(listen_port);
161
162 for (i = 0; i < NUM_ATTEMPTS; i++) {
163 s = socket(PF_INET, SOCK_STREAM, 0);
164 if (s == -1)
165 errx(-1, "socket: %s", strerror(errno));
166 if (connect(s, (struct sockaddr *)&sin,
167 sizeof(sin)) < 0)
168 errx(-1, "connect: %s", strerror(errno));
169 close(s);
170 }
171 _exit(0);
172 }
173
174 /* Reset back to a blocking socket. */
175 i = fcntl(s, F_GETFL);
176 if (i == -1)
177 errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
178 i &= ~O_NONBLOCK;
179 if (fcntl(s, F_SETFL, i) != 0)
180 errx(-1, "ioctl(F_SETFL): %s", strerror(errno));
181 i = fcntl(s, F_GETFL);
182 if (i == -1)
183 errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
184 if (i & O_NONBLOCK)
185 errx(-1, "Failed to clear O_NONBLOCK (i=0x%x)\n", i);
186
187 /* Do `NUM_ATTEMPTS` accepts with an invalid pointer. */
188 for (i = 0; !quit && i < NUM_ATTEMPTS; i++) {
189 size = sizeof(sin);
190 if (accept(s, (struct sockaddr *)(uintptr_t)(0x100),
191 &size) != -1)
192 errx(-1, "accept succeeded\n");
193 if (errno != EFAULT)
194 errx(-1, "accept: %s", strerror(errno));
195 }
196
197 if (waitpid(child, &status, 0) < 0)
198 errx(-1, "waitpid: %s", strerror(errno));
199 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
200 warnx("child process died");
201
202 /*
203 * Allocate a file descriptor and make sure it's fd2+2. 2 because
204 * we allocate an fd for the socket.
205 */
206 fd3 = dup(STDIN_FILENO);
207 if (fd3 != fd2 + 2)
208 printf("not ok 2 - (%d, %d, %d)\n", fd1, fd2, fd3);
209 else
210 printf("ok 2\n");
211
212 return (0);
213 }
214