1 /* 2 Copyright 2004 Michiel Boland. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions 6 are met: 7 8 1. Redistributions of source code must retain the above copyright 9 notice, this list of conditions and the following disclaimer. 10 11 2. Redistributions in binary form must reproduce the above copyright 12 notice, this list of conditions and the following disclaimer in the 13 documentation and/or other materials provided with the distribution. 14 15 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 20 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 21 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 22 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 24 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 25 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 27 */ 28 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 #include <fcntl.h> 33 #include <poll.h> 34 #include <unistd.h> 35 #include <signal.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 /* 41 * The following code sets up two connected TCP sockets that send data to each 42 * other until the window is closed. Then one of the sockets is closed, which 43 * will generate a RST once the TCP at the other socket does a window probe. 44 * 45 * All versions of FreeBSD prior to 11/26/2004 will ignore this RST into a 0 46 * window, causing the connection (and application) to hang indefinitely. 47 * On patched versions of FreeBSD (and other operating systems), the RST 48 * will be accepted and the program will exit in a few seconds. 49 */ 50 51 /* 52 * If the alarm fired then we've hung and the test failed. 53 */ 54 void 55 do_alrm(int s) 56 { 57 printf("not ok 1 - tcpfullwindowrst\n"); 58 exit(0); 59 } 60 61 int 62 main(void) 63 { 64 int o, s, t, u, do_t, do_u; 65 struct pollfd pfd[2]; 66 struct sockaddr_in sa; 67 char buf[4096]; 68 69 printf("1..1\n"); 70 signal(SIGALRM, do_alrm); 71 alarm(20); 72 73 s = socket(AF_INET, SOCK_STREAM, 0); 74 if (s == -1) 75 return 1; 76 o = 1; 77 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &o, sizeof o); 78 memset(&sa, 0, sizeof sa); 79 sa.sin_family = AF_INET; 80 sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 81 sa.sin_port = htons(3737); 82 if (bind(s, (struct sockaddr *) &sa, sizeof sa) == -1) 83 return 1; 84 if (listen(s, 1) == -1) 85 return 1; 86 t = socket(AF_INET, SOCK_STREAM, 0); 87 if (t == -1) 88 return 1; 89 if (connect(t, (struct sockaddr *) &sa, sizeof sa) == -1) 90 return 1; 91 u = accept(s, 0, 0); 92 if (u == -1) 93 return 1; 94 close(s); 95 fcntl(t, F_SETFL, fcntl(t, F_GETFL) | O_NONBLOCK); 96 fcntl(u, F_SETFL, fcntl(t, F_GETFL) | O_NONBLOCK); 97 do_t = 1; 98 do_u = 1; 99 pfd[0].fd = t; 100 pfd[0].events = POLLOUT; 101 pfd[1].fd = u; 102 pfd[1].events = POLLOUT; 103 while (do_t || do_u) { 104 if (poll(pfd, 2, 1000) == 0) { 105 if (do_t) { 106 close(t); 107 pfd[0].fd = -1; 108 do_t = 0; 109 } 110 continue; 111 } 112 if (pfd[0].revents & POLLOUT) { 113 if (write(t, buf, sizeof buf) == -1) { 114 close(t); 115 pfd[0].fd = -1; 116 do_t = 0; 117 } 118 } 119 if (pfd[1].revents & POLLOUT) { 120 if (write(u, buf, sizeof buf) == -1) { 121 close(u); 122 pfd[1].fd = -1; 123 do_u = 0; 124 } 125 } 126 } 127 128 printf("ok 1 - tcpfullwindowrst\n"); 129 return 0; 130 } 131