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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/socket/tcp_listen_socket.h"
      6 
      7 #if defined(OS_WIN)
      8 // winsock2.h must be included first in order to ensure it is included before
      9 // windows.h.
     10 #include <winsock2.h>
     11 #elif defined(OS_POSIX)
     12 #include <arpa/inet.h>
     13 #include <errno.h>
     14 #include <netinet/in.h>
     15 #include <sys/socket.h>
     16 #include <sys/types.h>
     17 #include "net/base/net_errors.h"
     18 #endif
     19 
     20 #include "base/logging.h"
     21 #include "base/sys_byteorder.h"
     22 #include "base/threading/platform_thread.h"
     23 #include "build/build_config.h"
     24 #include "net/base/net_util.h"
     25 #include "net/base/winsock_init.h"
     26 
     27 using std::string;
     28 
     29 namespace net {
     30 
     31 // static
     32 scoped_refptr<TCPListenSocket> TCPListenSocket::CreateAndListen(
     33     const string& ip, int port, StreamListenSocket::Delegate* del) {
     34   SocketDescriptor s = CreateAndBind(ip, port);
     35   if (s == kInvalidSocket)
     36     return NULL;
     37   scoped_refptr<TCPListenSocket> sock(new TCPListenSocket(s, del));
     38   sock->Listen();
     39   return sock;
     40 }
     41 
     42 TCPListenSocket::TCPListenSocket(SocketDescriptor s,
     43                                  StreamListenSocket::Delegate* del)
     44     : StreamListenSocket(s, del) {
     45 }
     46 
     47 TCPListenSocket::~TCPListenSocket() {}
     48 
     49 SocketDescriptor TCPListenSocket::CreateAndBind(const string& ip, int port) {
     50 #if defined(OS_WIN)
     51   EnsureWinsockInit();
     52 #endif
     53 
     54   SocketDescriptor s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
     55   if (s != kInvalidSocket) {
     56 #if defined(OS_POSIX)
     57     // Allow rapid reuse.
     58     static const int kOn = 1;
     59     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn));
     60 #endif
     61     sockaddr_in addr;
     62     memset(&addr, 0, sizeof(addr));
     63     addr.sin_family = AF_INET;
     64     addr.sin_addr.s_addr = inet_addr(ip.c_str());
     65     addr.sin_port = base::HostToNet16(port);
     66     if (bind(s, reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) {
     67 #if defined(OS_WIN)
     68       closesocket(s);
     69 #elif defined(OS_POSIX)
     70       close(s);
     71 #endif
     72       LOG(ERROR) << "Could not bind socket to " << ip << ":" << port;
     73       s = kInvalidSocket;
     74     }
     75   }
     76   return s;
     77 }
     78 
     79 SocketDescriptor TCPListenSocket::CreateAndBindAnyPort(const string& ip,
     80                                                        int* port) {
     81   SocketDescriptor s = CreateAndBind(ip, 0);
     82   if (s == kInvalidSocket)
     83     return kInvalidSocket;
     84   sockaddr_in addr;
     85   socklen_t addr_size = sizeof(addr);
     86   bool failed = getsockname(s, reinterpret_cast<struct sockaddr*>(&addr),
     87                             &addr_size) != 0;
     88   if (addr_size != sizeof(addr))
     89     failed = true;
     90   if (failed) {
     91     LOG(ERROR) << "Could not determine bound port, getsockname() failed";
     92 #if defined(OS_WIN)
     93     closesocket(s);
     94 #elif defined(OS_POSIX)
     95     close(s);
     96 #endif
     97     return kInvalidSocket;
     98   }
     99   *port = base::NetToHost16(addr.sin_port);
    100   return s;
    101 }
    102 
    103 void TCPListenSocket::Accept() {
    104   SocketDescriptor conn = AcceptSocket();
    105   if (conn == kInvalidSocket)
    106     return;
    107   scoped_refptr<TCPListenSocket> sock(
    108       new TCPListenSocket(conn, socket_delegate_));
    109   // It's up to the delegate to AddRef if it wants to keep it around.
    110 #if defined(OS_POSIX)
    111   sock->WatchSocket(WAITING_READ);
    112 #endif
    113   socket_delegate_->DidAccept(this, sock.get());
    114 }
    115 
    116 TCPListenSocketFactory::TCPListenSocketFactory(const string& ip, int port)
    117     : ip_(ip),
    118       port_(port) {
    119 }
    120 
    121 TCPListenSocketFactory::~TCPListenSocketFactory() {}
    122 
    123 scoped_refptr<StreamListenSocket> TCPListenSocketFactory::CreateAndListen(
    124     StreamListenSocket::Delegate* delegate) const {
    125   return TCPListenSocket::CreateAndListen(ip_, port_, delegate);
    126 }
    127 
    128 }  // namespace net
    129