listenclose.c revision 146250
1/*- 2 * Copyright (c) 2004-2005 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 * $FreeBSD: head/tools/regression/sockets/listenclose/listenclose.c 146250 2005-05-16 00:53:38Z rwatson $ 27 */ 28 29#include <sys/types.h> 30#include <sys/socket.h> 31 32#include <netinet/in.h> 33 34#include <arpa/inet.h> 35 36#include <err.h> 37#include <errno.h> 38#include <fcntl.h> 39#include <stdio.h> 40#include <string.h> 41#include <unistd.h> 42 43/* 44 * The listenclose regression test is designed to catch kernel bugs that may 45 * trigger as a result of performing a close on a listen() socket with as-yet 46 * unaccepted connections in its queues. This results in the connections 47 * being aborted, which is a not-often-followed code path. To do this, we 48 * create a local TCP socket, build a non-blocking connection to it, and then 49 * close the accept socket. The connection must be non-blocking or the 50 * program will block and as such connect() will not return as accept() is 51 * never called. 52 */ 53 54int 55main(int argc, char *argv[]) 56{ 57 int listen_sock, connect_sock; 58 struct sockaddr_in sin; 59 socklen_t len; 60 u_short port; 61 int arg; 62 63 listen_sock = socket(PF_INET, SOCK_STREAM, 0); 64 if (listen_sock == -1) 65 errx(-1, 66 "socket(PF_INET, SOCK_STREAM, 0) for listen socket: %s", 67 strerror(errno)); 68 69 70 bzero(&sin, sizeof(sin)); 71 sin.sin_len = sizeof(sin); 72 sin.sin_family = AF_INET; 73 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 74 sin.sin_port = 0; 75 76 if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) 77 errx(-1, "bind(%s, %d) for listen socket: %s", 78 inet_ntoa(sin.sin_addr), 0, strerror(errno)); 79 80 len = sizeof(sin); 81 if (getsockname(listen_sock, (struct sockaddr *)&sin, &len) < 0) 82 errx(-1, "getsockname() for listen socket: %s", 83 strerror(errno)); 84 port = sin.sin_port; 85 86 if (listen(listen_sock, -1) < 0) 87 errx(-1, "listen() for listen socket: %s", strerror(errno)); 88 89 connect_sock = socket(PF_INET, SOCK_STREAM, 0); 90 if (connect_sock == -1) 91 errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect " 92 "socket: %s", strerror(errno)); 93 94 arg = O_NONBLOCK; 95 if (fcntl(connect_sock, F_SETFL, &arg) < 0) 96 errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect socket" 97 ": %s", strerror(errno)); 98 99 bzero(&sin, sizeof(sin)); 100 sin.sin_len = sizeof(sin); 101 sin.sin_family = AF_INET; 102 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 103 sin.sin_port = port; 104 105 if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) 106 errx(-1, "connect() for connect socket: %s", strerror(errno)); 107 close(connect_sock); 108 close(listen_sock); 109 110 return (0); 111} 112