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 <netinet/in.h>
  32 #include <netinet/tcp.h>
  33 #include <sys/socket.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36
  37 #include <cerrno>
  38
  39 #include "base/misc.hh"
  40 #include "base/socket.hh"
  41 #include "base/types.hh"
  42
  43 using namespace std;
  44
  45 bool ListenSocket::listeningDisabled = false;
  46 bool ListenSocket::anyListening = false;
  47
  48 void
  49 ListenSocket::disableAll()
  50 {
  51     if (anyListening)
  52         panic("Too late to disable all listeners, already have a listener");
  53     listeningDisabled = true;
  54 }
  55
  56 bool
  57 ListenSocket::allDisabled()
  58 {
  59     return listeningDisabled;
  60 }
  61
  62 ////////////////////////////////////////////////////////////////////////
  63 //
  64 //
  65
  66 ListenSocket::ListenSocket()
  67     : listening(false), fd(-1)
  68 {}
  69
  70 ListenSocket::~ListenSocket()
  71 {
  72     if (fd != -1)
  73         close(fd);
  74 }
  75
  76 // Create a socket and configure it for listening
  77 bool
  78 ListenSocket::listen(int port, bool reuse)
  79 {
  80     if (listening)
  81         panic("Socket already listening!");
  82
  83     fd = ::socket(PF_INET, SOCK_STREAM, 0);
  84     if (fd < 0)
  85         panic("Can't create socket:%s !", strerror(errno));
  86
  87     if (reuse) {
  88         int i = 1;
  89         if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&i,
  90                          sizeof(i)) < 0)
  91             panic("ListenSocket(listen): setsockopt() SO_REUSEADDR failed!");
  92     }
  93
  94     struct sockaddr_in sockaddr;
  95     sockaddr.sin_family = PF_INET;
  96     sockaddr.sin_addr.s_addr = INADDR_ANY;
  97     sockaddr.sin_port = htons(port);
  98     // finally clear sin_zero
  99     memset(&sockaddr.sin_zero, 0, sizeof(sockaddr.sin_zero));
 100     int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr));
 101     if (ret != 0) {
 102         if (ret == -1 && errno != EADDRINUSE)
 103             panic("ListenSocket(listen): bind() failed!");
 104         return false;
 105     }
 106
 107     if (::listen(fd, 1) == -1) {
 108         if (errno != EADDRINUSE)
 109             panic("ListenSocket(listen): listen() failed!");
 110
 111         return false;
 112     }
 113
 114     listening = true;
 115     anyListening = true;
 116     return true;
 117 }
 118
 119
 120 // Open a connection.  Accept will block, so if you don't want it to,
 121 // make sure a connection is ready before you call accept.
 122 int
 123 ListenSocket::accept(bool nodelay)
 124 {
 125     struct sockaddr_in sockaddr;
 126     socklen_t slen = sizeof (sockaddr);
 127     int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen);
 128     if (sfd != -1 && nodelay) {
 129         int i = 1;
 130         if (::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i,
 131                          sizeof(i)) < 0)
 132             warn("ListenSocket(accept): setsockopt() TCP_NODELAY failed!");
 133     }
 134
 135     return sfd;
 136 }