1 files changed, 228 insertions, 0 deletions
diff --git a/Plugins/jingle/libjingle/talk/base/natsocketfactory.cc b/Plugins/jingle/libjingle/talk/base/natsocketfactory.cc
new file mode 100644
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--- /dev/null
+++ b/Plugins/jingle/libjingle/talk/base/natsocketfactory.cc
@@ -0,0 +1,228 @@
+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, 
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products 
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <iostream>
+#include <cassert>
+#include "talk/base/natsocketfactory.h"
+
+namespace talk_base {
+
+class NATSocket : public AsyncSocket {
+public:
+  NATSocket(Socket* socket, const SocketAddress& server_addr)
+      : async_(false), connected_(false), server_addr_(server_addr),
+        socket_(socket), buf_(0), size_(0) {
+  }
+
+  NATSocket(AsyncSocket* socket, const SocketAddress& server_addr)
+      : async_(true), connected_(false), server_addr_(server_addr),
+        socket_(socket), buf_(0), size_(0) {
+    socket->SignalReadEvent.connect(this, &NATSocket::OnReadEvent);
+    socket->SignalWriteEvent.connect(this, &NATSocket::OnWriteEvent);
+  }
+
+  virtual ~NATSocket() {
+    delete socket_;
+    delete buf_;
+  }
+
+  SocketAddress GetLocalAddress() const {
+    return socket_->GetLocalAddress();
+  }
+
+  SocketAddress GetRemoteAddress() const {
+    return remote_addr_; // will be ANY if not connected
+  }
+
+  int Bind(const SocketAddress& addr) {
+    return socket_->Bind(addr);
+  }
+
+  int Connect(const SocketAddress& addr) {
+    connected_ = true;
+    remote_addr_ = addr;
+    return 0;
+  }
+
+  int Send(const void *pv, size_t cb) {
+    assert(connected_);
+    return SendInternal(pv, cb, remote_addr_);
+  }
+
+  int SendTo(const void *pv, size_t cb, const SocketAddress& addr) {
+    assert(!connected_);
+    return SendInternal(pv, cb, addr);
+  }
+
+  int SendInternal(const void *pv, size_t cb, const SocketAddress& addr) {
+    size_t size = cb + addr.Size_();
+    char* buf = new char[size];
+    Encode(static_cast<const char*>(pv), cb, buf, size, addr);
+
+    int result = socket_->SendTo(buf, size, server_addr_);
+    delete buf;
+    if (result < 0) {
+      return result;
+    } else {
+      assert(result == static_cast<int>(size)); // TODO: This isn't fair.
+      return (int)((size_t)result - addr.Size_());
+    }
+  }
+
+  int Recv(void *pv, size_t cb) {
+    SocketAddress addr;
+    return RecvFrom(pv, cb, &addr);
+  }
+
+  int RecvFrom(void *pv, size_t cb, SocketAddress *paddr) {
+    // Make sure we have enough room to read the requested amount plus the
+    // header address.
+    SocketAddress remote_addr;
+    Grow(cb + remote_addr.Size_());
+
+    // Read the packet from the socket.
+    int result = socket_->RecvFrom(buf_, size_, &remote_addr);
+    if (result < 0)
+      return result;
+    assert(remote_addr == server_addr_);
+
+    // TODO: we need better framing so that we know how many bytes we can
+    // return before we need to read the next address.  For UDP, this will be
+    // fine as long as the reader always reads everything in the packet.
+    assert((size_t)result < size_);
+
+    // Decode the wire packet into the actual results.
+    SocketAddress real_remote_addr;
+    size_t real_size = cb;
+    Decode(buf_, result, pv, &real_size, &real_remote_addr);
+
+    // Make sure this packet should be delivered before returning it.
+    if (!connected_ || (real_remote_addr == remote_addr_)) {
+      if (paddr)
+        *paddr = real_remote_addr;
+      return (int)real_size;
+    } else {
+      std::cerr << "Dropping packet from unknown remote address: "
+                << real_remote_addr.ToString() << std::endl;
+      return 0; // Tell the caller we didn't read anything
+    }
+  }
+
+  int Close() {
+    connected_ = false;
+    remote_addr_ = SocketAddress();
+    return socket_->Close();
+  }
+
+  int Listen(int backlog) {
+    assert(false); // not yet implemented
+    return 0;
+  }
+
+  Socket* Accept(SocketAddress *paddr) {
+    assert(false); // not yet implemented
+    return 0;
+  }
+
+  AsyncSocket* asyncsocket() {
+    assert(async_);
+    return static_cast<AsyncSocket*>(socket_);
+  }
+
+  int GetError() const { return socket_->GetError(); }
+  void SetError(int error) { socket_->SetError(error); }
+
+  ConnState GetState() const { return connected_ ? CS_CONNECTED : CS_CLOSED; }
+
+  virtual int EstimateMTU(uint16* mtu) { return socket_->EstimateMTU(mtu); }
+  virtual int SetOption(Option opt, int value) { return socket_->SetOption(opt, value); }
+
+  void OnReadEvent(AsyncSocket* socket) {
+    assert(socket == socket_);
+    SignalReadEvent(this);
+  }
+
+  void OnWriteEvent(AsyncSocket* socket) {
+    assert(socket == socket_);
+    SignalWriteEvent(this);
+  }
+
+private:
+  // Makes sure the buffer is at least the given size.
+  void Grow(size_t new_size) {
+    if (size_ < new_size) {
+      delete buf_;
+      size_ = new_size;
+      buf_ = new char[size_];
+    }
+  }
+
+  // Encodes the given data and intended remote address into a packet to send
+  // to the NAT server.
+  void Encode(const char* data, size_t data_size, char* buf, size_t buf_size,
+	      const SocketAddress& remote_addr) {
+    assert(buf_size == data_size + remote_addr.Size_());
+    remote_addr.Write_(buf, (int)buf_size);
+    std::memcpy(buf + remote_addr.Size_(), data, data_size);
+  }
+
+  // Decodes the given packet from the NAT server into the actual remote
+  // address and data.
+  void Decode(const char* data, size_t data_size, void* buf, size_t* buf_size,
+	      SocketAddress* remote_addr) {
+    assert(data_size >= remote_addr->Size_());
+    assert(data_size <= *buf_size + remote_addr->Size_());
+    remote_addr->Read_(data, (int)data_size);
+    *buf_size = data_size - remote_addr->Size_();
+    std::memcpy(buf, data + remote_addr->Size_(), *buf_size);
+  }
+
+  bool async_;
+  bool connected_;
+  SocketAddress remote_addr_;
+  SocketAddress server_addr_;   // address of the NAT server
+  Socket* socket_;
+  char* buf_;
+  size_t size_;
+};
+
+NATSocketFactory::NATSocketFactory(
+    SocketFactory* factory, const SocketAddress& nat_addr)
+    : factory_(factory), nat_addr_(nat_addr) {
+}
+
+Socket* NATSocketFactory::CreateSocket(int type) {
+  assert(type == SOCK_DGRAM); // TCP is not yet suported
+  return new NATSocket(factory_->CreateSocket(type), nat_addr_);
+}
+
+AsyncSocket* NATSocketFactory::CreateAsyncSocket(int type) {
+  assert(type == SOCK_DGRAM); // TCP is not yet suported
+  return new NATSocket(factory_->CreateAsyncSocket(type), nat_addr_);
+}
+
+} // namespace talk_base