listenclose.c revision 146250
1137130Srwatson/*- 2146250Srwatson * Copyright (c) 2004-2005 Robert N. M. Watson 3137130Srwatson * All rights reserved. 4137130Srwatson * 5137130Srwatson * Redistribution and use in source and binary forms, with or without 6137130Srwatson * modification, are permitted provided that the following conditions 7137130Srwatson * are met: 8137130Srwatson * 1. Redistributions of source code must retain the above copyright 9137130Srwatson * notice, this list of conditions and the following disclaimer. 10137130Srwatson * 2. Redistributions in binary form must reproduce the above copyright 11137130Srwatson * notice, this list of conditions and the following disclaimer in the 12137130Srwatson * documentation and/or other materials provided with the distribution. 13137130Srwatson * 14137130Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15137130Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16137130Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17137130Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18137130Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19137130Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20137130Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21137130Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22137130Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23137130Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24137130Srwatson * SUCH DAMAGE. 25137130Srwatson * 26137130Srwatson * $FreeBSD: head/tools/regression/sockets/listenclose/listenclose.c 146250 2005-05-16 00:53:38Z rwatson $ 27137130Srwatson */ 28137130Srwatson 29137130Srwatson#include <sys/types.h> 30137130Srwatson#include <sys/socket.h> 31137130Srwatson 32137130Srwatson#include <netinet/in.h> 33137130Srwatson 34137130Srwatson#include <arpa/inet.h> 35137130Srwatson 36137130Srwatson#include <err.h> 37137130Srwatson#include <errno.h> 38137130Srwatson#include <fcntl.h> 39137130Srwatson#include <stdio.h> 40137130Srwatson#include <string.h> 41137130Srwatson#include <unistd.h> 42137130Srwatson 43137130Srwatson/* 44137130Srwatson * The listenclose regression test is designed to catch kernel bugs that may 45137130Srwatson * trigger as a result of performing a close on a listen() socket with as-yet 46137130Srwatson * unaccepted connections in its queues. This results in the connections 47137130Srwatson * being aborted, which is a not-often-followed code path. To do this, we 48137130Srwatson * create a local TCP socket, build a non-blocking connection to it, and then 49137130Srwatson * close the accept socket. The connection must be non-blocking or the 50137130Srwatson * program will block and as such connect() will not return as accept() is 51137130Srwatson * never called. 52137130Srwatson */ 53137130Srwatson 54137130Srwatsonint 55137130Srwatsonmain(int argc, char *argv[]) 56137130Srwatson{ 57137130Srwatson int listen_sock, connect_sock; 58137130Srwatson struct sockaddr_in sin; 59137130Srwatson socklen_t len; 60137130Srwatson u_short port; 61137130Srwatson int arg; 62137130Srwatson 63137130Srwatson listen_sock = socket(PF_INET, SOCK_STREAM, 0); 64137130Srwatson if (listen_sock == -1) 65137130Srwatson errx(-1, 66137130Srwatson "socket(PF_INET, SOCK_STREAM, 0) for listen socket: %s", 67137130Srwatson strerror(errno)); 68137130Srwatson 69137130Srwatson 70137130Srwatson bzero(&sin, sizeof(sin)); 71137130Srwatson sin.sin_len = sizeof(sin); 72137130Srwatson sin.sin_family = AF_INET; 73137130Srwatson sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 74137130Srwatson sin.sin_port = 0; 75137130Srwatson 76137130Srwatson if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) 77137130Srwatson errx(-1, "bind(%s, %d) for listen socket: %s", 78137130Srwatson inet_ntoa(sin.sin_addr), 0, strerror(errno)); 79137130Srwatson 80137130Srwatson len = sizeof(sin); 81137130Srwatson if (getsockname(listen_sock, (struct sockaddr *)&sin, &len) < 0) 82137130Srwatson errx(-1, "getsockname() for listen socket: %s", 83137130Srwatson strerror(errno)); 84137130Srwatson port = sin.sin_port; 85137130Srwatson 86137130Srwatson if (listen(listen_sock, -1) < 0) 87137130Srwatson errx(-1, "listen() for listen socket: %s", strerror(errno)); 88137130Srwatson 89137130Srwatson connect_sock = socket(PF_INET, SOCK_STREAM, 0); 90137130Srwatson if (connect_sock == -1) 91137130Srwatson errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect " 92137130Srwatson "socket: %s", strerror(errno)); 93137130Srwatson 94137130Srwatson arg = O_NONBLOCK; 95137130Srwatson if (fcntl(connect_sock, F_SETFL, &arg) < 0) 96137130Srwatson errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect socket" 97137130Srwatson ": %s", strerror(errno)); 98137130Srwatson 99137130Srwatson bzero(&sin, sizeof(sin)); 100137130Srwatson sin.sin_len = sizeof(sin); 101137130Srwatson sin.sin_family = AF_INET; 102137130Srwatson sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 103137130Srwatson sin.sin_port = port; 104137130Srwatson 105137130Srwatson if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) 106137130Srwatson errx(-1, "connect() for connect socket: %s", strerror(errno)); 107146250Srwatson close(connect_sock); 108137130Srwatson close(listen_sock); 109137130Srwatson 110137130Srwatson return (0); 111137130Srwatson} 112