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      1 /*
      2  * libjingle
      3  * Copyright 2011, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/p2p/base/basicpacketsocketfactory.h"
     29 
     30 #include "talk/base/asyncudpsocket.h"
     31 #include "talk/base/asynctcpsocket.h"
     32 #include "talk/base/logging.h"
     33 #include "talk/base/nethelpers.h"
     34 #include "talk/base/physicalsocketserver.h"
     35 #include "talk/base/scoped_ptr.h"
     36 #include "talk/base/socketadapters.h"
     37 #include "talk/base/thread.h"
     38 #include "talk/p2p/base/asyncstuntcpsocket.h"
     39 #include "talk/p2p/base/stun.h"
     40 
     41 namespace talk_base {
     42 
     43 BasicPacketSocketFactory::BasicPacketSocketFactory()
     44     : thread_(Thread::Current()),
     45       socket_factory_(NULL) {
     46 }
     47 
     48 BasicPacketSocketFactory::BasicPacketSocketFactory(Thread* thread)
     49     : thread_(thread),
     50       socket_factory_(NULL) {
     51 }
     52 
     53 BasicPacketSocketFactory::BasicPacketSocketFactory(
     54     SocketFactory* socket_factory)
     55     : thread_(NULL),
     56       socket_factory_(socket_factory) {
     57 }
     58 
     59 BasicPacketSocketFactory::~BasicPacketSocketFactory() {
     60 }
     61 
     62 AsyncPacketSocket* BasicPacketSocketFactory::CreateUdpSocket(
     63     const SocketAddress& address, int min_port, int max_port) {
     64   // UDP sockets are simple.
     65   talk_base::AsyncSocket* socket =
     66       socket_factory()->CreateAsyncSocket(
     67           address.family(), SOCK_DGRAM);
     68   if (!socket) {
     69     return NULL;
     70   }
     71   if (BindSocket(socket, address, min_port, max_port) < 0) {
     72     LOG(LS_ERROR) << "UDP bind failed with error "
     73                     << socket->GetError();
     74     delete socket;
     75     return NULL;
     76   }
     77   return new talk_base::AsyncUDPSocket(socket);
     78 }
     79 
     80 AsyncPacketSocket* BasicPacketSocketFactory::CreateServerTcpSocket(
     81     const SocketAddress& local_address, int min_port, int max_port, int opts) {
     82 
     83   // Fail if TLS is required.
     84   if (opts & PacketSocketFactory::OPT_TLS) {
     85     LOG(LS_ERROR) << "TLS support currently is not available.";
     86     return NULL;
     87   }
     88 
     89   talk_base::AsyncSocket* socket =
     90       socket_factory()->CreateAsyncSocket(local_address.family(),
     91                                           SOCK_STREAM);
     92   if (!socket) {
     93     return NULL;
     94   }
     95 
     96   if (BindSocket(socket, local_address, min_port, max_port) < 0) {
     97     LOG(LS_ERROR) << "TCP bind failed with error "
     98                   << socket->GetError();
     99     delete socket;
    100     return NULL;
    101   }
    102 
    103   // If using SSLTCP, wrap the TCP socket in a pseudo-SSL socket.
    104   if (opts & PacketSocketFactory::OPT_SSLTCP) {
    105     ASSERT(!(opts & PacketSocketFactory::OPT_TLS));
    106     socket = new talk_base::AsyncSSLSocket(socket);
    107   }
    108 
    109   // Set TCP_NODELAY (via OPT_NODELAY) for improved performance.
    110   // See http://go/gtalktcpnodelayexperiment
    111   socket->SetOption(talk_base::Socket::OPT_NODELAY, 1);
    112 
    113   if (opts & PacketSocketFactory::OPT_STUN)
    114     return new cricket::AsyncStunTCPSocket(socket, true);
    115 
    116   return new talk_base::AsyncTCPSocket(socket, true);
    117 }
    118 
    119 AsyncPacketSocket* BasicPacketSocketFactory::CreateClientTcpSocket(
    120     const SocketAddress& local_address, const SocketAddress& remote_address,
    121     const ProxyInfo& proxy_info, const std::string& user_agent, int opts) {
    122 
    123   // Fail if TLS is required.
    124   if (opts & PacketSocketFactory::OPT_TLS) {
    125     LOG(LS_ERROR) << "TLS support currently is not available.";
    126     return NULL;
    127   }
    128 
    129   talk_base::AsyncSocket* socket =
    130       socket_factory()->CreateAsyncSocket(local_address.family(), SOCK_STREAM);
    131   if (!socket) {
    132     return NULL;
    133   }
    134 
    135   if (BindSocket(socket, local_address, 0, 0) < 0) {
    136     LOG(LS_ERROR) << "TCP bind failed with error "
    137                   << socket->GetError();
    138     delete socket;
    139     return NULL;
    140   }
    141 
    142   // If using a proxy, wrap the socket in a proxy socket.
    143   if (proxy_info.type == talk_base::PROXY_SOCKS5) {
    144     socket = new talk_base::AsyncSocksProxySocket(
    145         socket, proxy_info.address, proxy_info.username, proxy_info.password);
    146   } else if (proxy_info.type == talk_base::PROXY_HTTPS) {
    147     socket = new talk_base::AsyncHttpsProxySocket(
    148         socket, user_agent, proxy_info.address,
    149         proxy_info.username, proxy_info.password);
    150   }
    151 
    152   // If using SSLTCP, wrap the TCP socket in a pseudo-SSL socket.
    153   if (opts & PacketSocketFactory::OPT_SSLTCP) {
    154     ASSERT(!(opts & PacketSocketFactory::OPT_TLS));
    155     socket = new talk_base::AsyncSSLSocket(socket);
    156   }
    157 
    158   if (socket->Connect(remote_address) < 0) {
    159     LOG(LS_ERROR) << "TCP connect failed with error "
    160                   << socket->GetError();
    161     delete socket;
    162     return NULL;
    163   }
    164 
    165   // Finally, wrap that socket in a TCP or STUN TCP packet socket.
    166   AsyncPacketSocket* tcp_socket;
    167   if (opts & PacketSocketFactory::OPT_STUN) {
    168     tcp_socket = new cricket::AsyncStunTCPSocket(socket, false);
    169   } else {
    170     tcp_socket = new talk_base::AsyncTCPSocket(socket, false);
    171   }
    172 
    173   // Set TCP_NODELAY (via OPT_NODELAY) for improved performance.
    174   // See http://go/gtalktcpnodelayexperiment
    175   tcp_socket->SetOption(talk_base::Socket::OPT_NODELAY, 1);
    176 
    177   return tcp_socket;
    178 }
    179 
    180 AsyncResolverInterface* BasicPacketSocketFactory::CreateAsyncResolver() {
    181   return new talk_base::AsyncResolver();
    182 }
    183 
    184 int BasicPacketSocketFactory::BindSocket(
    185     AsyncSocket* socket, const SocketAddress& local_address,
    186     int min_port, int max_port) {
    187   int ret = -1;
    188   if (min_port == 0 && max_port == 0) {
    189     // If there's no port range, let the OS pick a port for us.
    190     ret = socket->Bind(local_address);
    191   } else {
    192     // Otherwise, try to find a port in the provided range.
    193     for (int port = min_port; ret < 0 && port <= max_port; ++port) {
    194       ret = socket->Bind(talk_base::SocketAddress(local_address.ipaddr(),
    195                                                   port));
    196     }
    197   }
    198   return ret;
    199 }
    200 
    201 SocketFactory* BasicPacketSocketFactory::socket_factory() {
    202   if (thread_) {
    203     ASSERT(thread_ == Thread::Current());
    204     return thread_->socketserver();
    205   } else {
    206     return socket_factory_;
    207   }
    208 }
    209 
    210 }  // namespace talk_base
    211