socket.cc revision 12334:e0ab29a34764
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 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 are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31#include "base/socket.hh" 32 33#include <netinet/in.h> 34#include <netinet/tcp.h> 35#include <sys/socket.h> 36#include <sys/types.h> 37#include <unistd.h> 38 39#include <cerrno> 40 41#include "base/logging.hh" 42#include "base/types.hh" 43#include "sim/byteswap.hh" 44 45using namespace std; 46 47bool ListenSocket::listeningDisabled = false; 48bool ListenSocket::anyListening = false; 49 50bool ListenSocket::bindToLoopback = false; 51 52void 53ListenSocket::disableAll() 54{ 55 if (anyListening) 56 panic("Too late to disable all listeners, already have a listener"); 57 listeningDisabled = true; 58} 59 60bool 61ListenSocket::allDisabled() 62{ 63 return listeningDisabled; 64} 65 66void 67ListenSocket::loopbackOnly() 68{ 69 if (anyListening) 70 panic("Too late to bind to loopback, already have a listener"); 71 bindToLoopback = true; 72} 73 74//////////////////////////////////////////////////////////////////////// 75// 76// 77 78ListenSocket::ListenSocket() 79 : listening(false), fd(-1) 80{} 81 82ListenSocket::~ListenSocket() 83{ 84 if (fd != -1) 85 close(fd); 86} 87 88// Create a socket and configure it for listening 89bool 90ListenSocket::listen(int port, bool reuse) 91{ 92 if (listening) 93 panic("Socket already listening!"); 94 95 fd = ::socket(PF_INET, SOCK_STREAM, 0); 96 if (fd < 0) 97 panic("Can't create socket:%s !", strerror(errno)); 98 99 if (reuse) { 100 int i = 1; 101 if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&i, 102 sizeof(i)) < 0) 103 panic("ListenSocket(listen): setsockopt() SO_REUSEADDR failed!"); 104 } 105 106 struct sockaddr_in sockaddr; 107 sockaddr.sin_family = PF_INET; 108 sockaddr.sin_addr.s_addr = 109 htobe<in_addr_t>(bindToLoopback ? INADDR_LOOPBACK : INADDR_ANY); 110 sockaddr.sin_port = htons(port); 111 // finally clear sin_zero 112 memset(&sockaddr.sin_zero, 0, sizeof(sockaddr.sin_zero)); 113 int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr)); 114 if (ret != 0) { 115 if (ret == -1 && errno != EADDRINUSE) 116 panic("ListenSocket(listen): bind() failed!"); 117 return false; 118 } 119 120 if (::listen(fd, 1) == -1) { 121 if (errno != EADDRINUSE) 122 panic("ListenSocket(listen): listen() failed!"); 123 124 return false; 125 } 126 127 listening = true; 128 anyListening = true; 129 return true; 130} 131 132 133// Open a connection. Accept will block, so if you don't want it to, 134// make sure a connection is ready before you call accept. 135int 136ListenSocket::accept(bool nodelay) 137{ 138 struct sockaddr_in sockaddr; 139 socklen_t slen = sizeof (sockaddr); 140 int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen); 141 if (sfd != -1 && nodelay) { 142 int i = 1; 143 if (::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i, 144 sizeof(i)) < 0) 145 warn("ListenSocket(accept): setsockopt() TCP_NODELAY failed!"); 146 } 147 148 return sfd; 149} 150