1 /*- 2 * Copyright (c) 2006 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 /* 28 * TCP regression test which opens a loopback TCP session, and closes it 29 * before the remote endpoint (server) can accept it. Run the test twice, 30 * once using an explicit close() from the client, a second using a tcp drop. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <sys/sysctl.h> 36 37 #include <netinet/in.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <signal.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #define TCP_PORT 9005 48 49 static int 50 tcp_drop(struct sockaddr_in *sin_local, struct sockaddr_in *sin_remote) 51 { 52 struct sockaddr_storage addrs[2]; 53 54 /* 55 * Sysctl accepts an array of two sockaddr's, the first being the 56 * 'foreign' sockaddr, the second being the 'local' sockaddr. 57 */ 58 59 bcopy(sin_remote, &addrs[0], sizeof(*sin_remote)); 60 bcopy(sin_local, &addrs[1], sizeof(*sin_local)); 61 62 return (sysctlbyname("net.inet.tcp.drop", NULL, 0, addrs, 63 sizeof(addrs))); 64 } 65 66 67 static void 68 tcp_server(pid_t partner) 69 { 70 int error, listen_fd, accept_fd; 71 struct sockaddr_in sin; 72 73 listen_fd = socket(PF_INET, SOCK_STREAM, 0); 74 if (listen_fd < 0) { 75 error = errno; 76 (void)kill(partner, SIGKILL); 77 errno = error; 78 err(-1, "tcp_server: socket"); 79 } 80 81 bzero(&sin, sizeof(sin)); 82 sin.sin_family = AF_INET; 83 sin.sin_len = sizeof(sin); 84 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 85 sin.sin_port = htons(TCP_PORT); 86 87 if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 88 error = errno; 89 (void)kill(partner, SIGKILL); 90 errno = error; 91 err(-1, "tcp_server: bind"); 92 } 93 94 if (listen(listen_fd, -1) < 0) { 95 error = errno; 96 (void)kill(partner, SIGKILL); 97 errno = error; 98 err(-1, "tcp_server: listen"); 99 } 100 101 sleep(10); 102 103 accept_fd = accept(listen_fd, NULL, NULL); 104 if (accept_fd < 0) { 105 error = errno; 106 (void)kill(partner, SIGKILL); 107 errno = error; 108 err(-1, "tcp_server: accept"); 109 } 110 close(accept_fd); 111 close(listen_fd); 112 } 113 114 static void 115 tcp_client(pid_t partner, int dropflag) 116 { 117 struct sockaddr_in sin, sin_local; 118 int error, sock; 119 socklen_t slen; 120 121 sleep(1); 122 123 sock = socket(PF_INET, SOCK_STREAM, 0); 124 if (sock < 0) { 125 error = errno; 126 (void)kill(partner, SIGKILL); 127 errno = error; 128 err(-1, "socket"); 129 } 130 131 bzero(&sin, sizeof(sin)); 132 sin.sin_family = AF_INET; 133 sin.sin_len = sizeof(sin); 134 sin.sin_addr.s_addr = ntohl(INADDR_LOOPBACK); 135 sin.sin_port = htons(TCP_PORT); 136 137 if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 138 error = errno; 139 (void)kill(partner, SIGKILL); 140 errno = error; 141 err(-1, "connect"); 142 } 143 144 slen = sizeof(sin_local); 145 if (getsockname(sock, (struct sockaddr *)&sin_local, &slen) < 0) { 146 error = errno; 147 (void)kill(partner, SIGKILL); 148 errno = error; 149 err(-1, "getsockname"); 150 } 151 152 if (dropflag) { 153 if (tcp_drop(&sin_local, &sin) < 0) { 154 error = errno; 155 (void)kill(partner, SIGKILL); 156 errno = error; 157 err(-1, "tcp_drop"); 158 } 159 sleep(2); 160 } 161 close(sock); 162 } 163 164 int 165 main(int argc, char *argv[]) 166 { 167 pid_t child_pid, parent_pid; 168 169 if (signal(SIGCHLD, SIG_IGN) == SIG_ERR) 170 err(-1, "signal"); 171 172 parent_pid = getpid(); 173 child_pid = fork(); 174 if (child_pid < 0) 175 err(-1, "fork"); 176 if (child_pid == 0) { 177 child_pid = getpid(); 178 tcp_server(parent_pid); 179 return (0); 180 } else 181 tcp_client(child_pid, 0); 182 (void)kill(child_pid, SIGTERM); 183 184 sleep(5); 185 186 parent_pid = getpid(); 187 child_pid = fork(); 188 if (child_pid < 0) 189 err(-1, "fork"); 190 if (child_pid == 0) { 191 child_pid = getpid(); 192 tcp_server(parent_pid); 193 return (0); 194 } else 195 tcp_client(child_pid, 1); 196 (void)kill(child_pid, SIGTERM); 197 198 return (0); 199 } 200