src/base/socket.cc

   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
  45 using namespace std;
  46
  47 bool ListenSocket::listeningDisabled = false;
  48 bool ListenSocket::anyListening = false;
  49
  50 bool ListenSocket::bindToLoopback = false;
  51
  52 void
  53 ListenSocket::disableAll()
  54 {
  55     if (anyListening)
  56         panic("Too late to disable all listeners, already have a listener");
  57     listeningDisabled = true;
  58 }
  59
  60 bool
  61 ListenSocket::allDisabled()
  62 {
  63     return listeningDisabled;
  64 }
  65
  66 void
  67 ListenSocket::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
  78 ListenSocket::ListenSocket()
  79     : listening(false), fd(-1)
  80 {}
  81
  82 ListenSocket::~ListenSocket()
  83 {
  84     if (fd != -1)
  85         close(fd);
  86 }
  87
  88 // Create a socket and configure it for listening
  89 bool
  90 ListenSocket::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.
 135 int
 136 ListenSocket::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 }