1/* 2 * libjingle 3 * Copyright 2004--2005, 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/stunserver.h" 29 30#include "talk/base/bytebuffer.h" 31#include "talk/base/logging.h" 32 33namespace cricket { 34 35StunServer::StunServer(talk_base::AsyncUDPSocket* socket) : socket_(socket) { 36 socket_->SignalReadPacket.connect(this, &StunServer::OnPacket); 37} 38 39StunServer::~StunServer() { 40 socket_->SignalReadPacket.disconnect(this); 41} 42 43void StunServer::OnPacket( 44 talk_base::AsyncPacketSocket* socket, const char* buf, size_t size, 45 const talk_base::SocketAddress& remote_addr) { 46 // Parse the STUN message; eat any messages that fail to parse. 47 talk_base::ByteBuffer bbuf(buf, size); 48 StunMessage msg; 49 if (!msg.Read(&bbuf)) { 50 return; 51 } 52 53 // TODO: If unknown non-optional (<= 0x7fff) attributes are found, send a 54 // 420 "Unknown Attribute" response. 55 56 // Send the message to the appropriate handler function. 57 switch (msg.type()) { 58 case STUN_BINDING_REQUEST: 59 OnBindingRequest(&msg, remote_addr); 60 break; 61 62 default: 63 SendErrorResponse(msg, remote_addr, 600, "Operation Not Supported"); 64 } 65} 66 67void StunServer::OnBindingRequest( 68 StunMessage* msg, const talk_base::SocketAddress& remote_addr) { 69 StunMessage response; 70 response.SetType(STUN_BINDING_RESPONSE); 71 response.SetTransactionID(msg->transaction_id()); 72 73 // Tell the user the address that we received their request from. 74 StunAddressAttribute* mapped_addr; 75 if (!msg->IsLegacy()) { 76 mapped_addr = StunAttribute::CreateAddress(STUN_ATTR_MAPPED_ADDRESS); 77 } else { 78 mapped_addr = StunAttribute::CreateXorAddress(STUN_ATTR_XOR_MAPPED_ADDRESS); 79 } 80 mapped_addr->SetAddress(remote_addr); 81 response.AddAttribute(mapped_addr); 82 83 SendResponse(response, remote_addr); 84} 85 86void StunServer::SendErrorResponse( 87 const StunMessage& msg, const talk_base::SocketAddress& addr, 88 int error_code, const char* error_desc) { 89 StunMessage err_msg; 90 err_msg.SetType(GetStunErrorResponseType(msg.type())); 91 err_msg.SetTransactionID(msg.transaction_id()); 92 93 StunErrorCodeAttribute* err_code = StunAttribute::CreateErrorCode(); 94 err_code->SetCode(error_code); 95 err_code->SetReason(error_desc); 96 err_msg.AddAttribute(err_code); 97 98 SendResponse(err_msg, addr); 99} 100 101void StunServer::SendResponse( 102 const StunMessage& msg, const talk_base::SocketAddress& addr) { 103 talk_base::ByteBuffer buf; 104 msg.Write(&buf); 105 if (socket_->SendTo(buf.Data(), buf.Length(), addr) < 0) 106 LOG_ERR(LS_ERROR) << "sendto"; 107} 108 109} // namespace cricket 110