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 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 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