diff options
Diffstat (limited to 'kopete/protocols/jabber/jingle/libjingle/talk/p2p/base/port.cpp')
| -rw-r--r-- | kopete/protocols/jabber/jingle/libjingle/talk/p2p/base/port.cpp | 869 |
1 files changed, 869 insertions, 0 deletions
diff --git a/kopete/protocols/jabber/jingle/libjingle/talk/p2p/base/port.cpp b/kopete/protocols/jabber/jingle/libjingle/talk/p2p/base/port.cpp new file mode 100644 index 00000000..14549b5b --- /dev/null +++ b/kopete/protocols/jabber/jingle/libjingle/talk/p2p/base/port.cpp @@ -0,0 +1,869 @@ +/* + * 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. + */ + +#if defined(_MSC_VER) && _MSC_VER < 1300 +#pragma warning(disable:4786) +#endif +#include "talk/base/logging.h" +#include "talk/base/asyncudpsocket.h" +#include "talk/base/asynctcpsocket.h" +#include "talk/base/socketadapters.h" +#include "talk/p2p/base/port.h" +#include "talk/p2p/base/helpers.h" +#include "talk/base/scoped_ptr.h" +#include <errno.h> +#include <algorithm> +#include <iostream> +#include <cassert> +#include <vector> + +#if defined(_MSC_VER) && _MSC_VER < 1300 +namespace std { + using ::memcmp; +} +#endif + +namespace { + +// The length of time we wait before timing out readability on a connection. +const uint32 CONNECTION_READ_TIMEOUT = 30 * 1000; // 30 seconds + +// The length of time we wait before timing out writability on a connection. +const uint32 CONNECTION_WRITE_TIMEOUT = 15 * 1000; // 15 seconds + +// The length of time we wait before we become unwritable. +const uint32 CONNECTION_WRITE_CONNECT_TIMEOUT = 5 * 1000; // 5 seconds + +// The number of pings that must fail to respond before we become unwritable. +const uint32 CONNECTION_WRITE_CONNECT_FAILURES = 5; + +// This is the length of time that we wait for a ping response to come back. +const int CONNECTION_RESPONSE_TIMEOUT = 5 * 1000; // 5 seconds + +// Determines whether we have seen at least the given maximum number of +// pings fail to have a response. +inline bool TooManyFailures( + const std::vector<uint32>& pings_since_last_response, + uint32 maximum_failures, + uint32 rtt_estimate, + uint32 now) { + + // If we haven't sent that many pings, then we can't have failed that many. + if (pings_since_last_response.size() < maximum_failures) + return false; + + // Check if the window in which we would expect a response to the ping has + // already elapsed. + return pings_since_last_response[maximum_failures - 1] + rtt_estimate < now; +} + +// Determines whether we have gone too long without seeing any response. +inline bool TooLongWithoutResponse( + const std::vector<uint32>& pings_since_last_response, + uint32 maximum_time, + uint32 now) { + + if (pings_since_last_response.size() == 0) + return false; + + return pings_since_last_response[0] + maximum_time < now; +} + +// We will restrict RTT estimates (when used for determining state) to be +// within a reasonable range. +const uint32 MINIMUM_RTT = 100; // 0.1 seconds +const uint32 MAXIMUM_RTT = 3000; // 3 seconds + +// When we don't have any RTT data, we have to pick something reasonable. We +// use a large value just in case the connection is really slow. +const uint32 DEFAULT_RTT = MAXIMUM_RTT; + +// Computes our estimate of the RTT given the current estimate and the number +// of data points on which it is based. +inline uint32 ConservativeRTTEstimate(uint32 rtt, uint32 rtt_data_points) { + if (rtt_data_points == 0) + return DEFAULT_RTT; + else + return cricket::_max(MINIMUM_RTT, cricket::_min(MAXIMUM_RTT, 2 * rtt)); +} + +// Weighting of the old rtt value to new data. +const int RTT_RATIO = 3; // 3 : 1 + +// The delay before we begin checking if this port is useless. +const int kPortTimeoutDelay = 30 * 1000; // 30 seconds + +const uint32 MSG_CHECKTIMEOUT = 1; +const uint32 MSG_DELETE = 1; + +} + +namespace cricket { + +static const char * const PROTO_NAMES[PROTO_LAST+1] = { "udp", "tcp", "ssltcp" }; + +const char * ProtoToString(ProtocolType proto) { + return PROTO_NAMES[proto]; +} + +bool StringToProto(const char * value, ProtocolType& proto) { + for (size_t i=0; i<=PROTO_LAST; ++i) { + if (strcmp(PROTO_NAMES[i], value) == 0) { + proto = static_cast<ProtocolType>(i); + return true; + } + } + return false; +} + +ProxyInfo Port::proxy_; + +Port::Port(Thread* thread, const std::string& type, SocketFactory* factory, + Network* network) + : thread_(thread), factory_(factory), type_(type), network_(network), + preference_(-1), lifetime_(LT_PRESTART) { + + if (factory_ == NULL) + factory_ = thread_->socketserver(); + + set_username_fragment(CreateRandomString(16)); + set_password(CreateRandomString(16)); +} + +Port::~Port() { + // Delete all of the remaining connections. We copy the list up front + // because each deletion will cause it to be modified. + + std::vector<Connection*> list; + + AddressMap::iterator iter = connections_.begin(); + while (iter != connections_.end()) { + list.push_back(iter->second); + ++iter; + } + + for (uint32 i = 0; i < list.size(); i++) + delete list[i]; +} + +Connection* Port::GetConnection(const SocketAddress& remote_addr) { + AddressMap::const_iterator iter = connections_.find(remote_addr); + if (iter != connections_.end()) + return iter->second; + else + return NULL; +} + +void Port::set_username_fragment(const std::string& username_fragment) { + username_frag_ = username_fragment; +} + +void Port::set_password(const std::string& password) { + password_ = password; +} + +void Port::add_address(const SocketAddress& address, const std::string& protocol, bool final) { + Candidate c; + c.set_name(name_); + c.set_type(type_); + c.set_protocol(protocol); + c.set_address(address); + c.set_preference(preference_); + c.set_username(username_frag_); + c.set_password(password_); + c.set_network_name(network_->name()); + c.set_generation(generation_); + candidates_.push_back(c); + + if (final) + SignalAddressReady(this); +} + +void Port::AddConnection(Connection* conn) { + connections_[conn->remote_candidate().address()] = conn; + conn->SignalDestroyed.connect(this, &Port::OnConnectionDestroyed); + SignalConnectionCreated(this, conn); +} + +void Port::OnReadPacket( + const char* data, size_t size, const SocketAddress& addr) { + + // If this is an authenticated STUN request, then signal unknown address and + // send back a proper binding response. + StunMessage* msg; + std::string remote_username; + if (!GetStunMessage(data, size, addr, msg, remote_username)) { + LOG(LERROR) << "Received non-STUN packet from unknown address: " + << addr.ToString(); + } else if (!msg) { + // STUN message handled already + } else if (msg->type() == STUN_BINDING_REQUEST) { + SignalUnknownAddress(this, addr, msg, remote_username); + } else { + LOG(LERROR) << "Received unexpected STUN message type (" << msg->type() + << ") from unknown address: " << addr.ToString(); + delete msg; + } +} + +void Port::SendBindingRequest(Connection* conn) { + + // Construct the request message. + + StunMessage request; + request.SetType(STUN_BINDING_REQUEST); + request.SetTransactionID(CreateRandomString(16)); + + StunByteStringAttribute* username_attr = + StunAttribute::CreateByteString(STUN_ATTR_USERNAME); + std::string username = conn->remote_candidate().username(); + username.append(username_frag_); + username_attr->CopyBytes(username.c_str(), (uint16)username.size()); + request.AddAttribute(username_attr); + + // Send the request message. + // NOTE: If we wanted to, this is where we would add the HMAC. + ByteBuffer buf; + request.Write(&buf); + SendTo(buf.Data(), buf.Length(), conn->remote_candidate().address(), false); +} + +bool Port::GetStunMessage(const char* data, size_t size, + const SocketAddress& addr, StunMessage *& msg, + std::string& remote_username) { + // NOTE: This could clearly be optimized to avoid allocating any memory. + // However, at the data rates we'll be looking at on the client side, + // this probably isn't worth worrying about. + + msg = 0; + + // Parse the request message. If the packet is not a complete and correct + // STUN message, then ignore it. + buzz::scoped_ptr<StunMessage> stun_msg(new StunMessage()); + ByteBuffer buf(data, size); + if (!stun_msg->Read(&buf) || (buf.Length() > 0)) { + return false; + } + + // The packet must include a username that either begins or ends with our + // fragment. It should begin with our fragment if it is a request and it + // should end with our fragment if it is a response. + const StunByteStringAttribute* username_attr = + stun_msg->GetByteString(STUN_ATTR_USERNAME); + + int remote_frag_len = (username_attr ? username_attr->length() : 0); + remote_frag_len -= static_cast<int>(username_frag_.size()); + + if (stun_msg->type() == STUN_BINDING_REQUEST) { + if ((remote_frag_len < 0) + || (std::memcmp(username_attr->bytes(), + username_frag_.c_str(), username_frag_.size()) != 0)) { + LOG(LERROR) << "Received STUN request with bad username"; + SendBindingErrorResponse(stun_msg.get(), addr, STUN_ERROR_BAD_REQUEST, + STUN_ERROR_REASON_BAD_REQUEST); + return true; + } + + remote_username.assign(username_attr->bytes() + username_frag_.size(), + username_attr->bytes() + username_attr->length()); + } else if ((stun_msg->type() == STUN_BINDING_RESPONSE) + || (stun_msg->type() == STUN_BINDING_ERROR_RESPONSE)) { + if ((remote_frag_len < 0) + || (std::memcmp(username_attr->bytes() + remote_frag_len, + username_frag_.c_str(), username_frag_.size()) != 0)) { + LOG(LERROR) << "Received STUN response with bad username"; + // Do not send error response to a response + return true; + } + + remote_username.assign(username_attr->bytes(), + username_attr->bytes() + remote_frag_len); + + if (stun_msg->type() == STUN_BINDING_ERROR_RESPONSE) { + if (const StunErrorCodeAttribute* error_code = stun_msg->GetErrorCode()) { + LOG(LERROR) << "Received STUN binding error:" + << " class=" << error_code->error_class() + << " number=" << error_code->number() + << " reason='" << error_code->reason() << "'"; + // Return message to allow error-specific processing + } else { + LOG(LERROR) << "Received STUN error response with no error code"; + // Drop corrupt message + return true; + } + } + } else { + LOG(LERROR) << "Received STUN packet with invalid type: " + << stun_msg->type(); + return true; + } + + // Return the STUN message found. + msg = stun_msg.release(); + return true; +} + +void Port::SendBindingResponse( + StunMessage* request, const SocketAddress& addr) { + + assert(request->type() == STUN_BINDING_REQUEST); + + // Retrieve the username from the request. + const StunByteStringAttribute* username_attr = + request->GetByteString(STUN_ATTR_USERNAME); + assert(username_attr); + + // Fill in the response message. + + StunMessage response; + response.SetType(STUN_BINDING_RESPONSE); + response.SetTransactionID(request->transaction_id()); + + StunByteStringAttribute* username2_attr = + StunAttribute::CreateByteString(STUN_ATTR_USERNAME); + username2_attr->CopyBytes(username_attr->bytes(), username_attr->length()); + response.AddAttribute(username2_attr); + + StunAddressAttribute* addr_attr = + StunAttribute::CreateAddress(STUN_ATTR_MAPPED_ADDRESS); + addr_attr->SetFamily(1); + addr_attr->SetPort(addr.port()); + addr_attr->SetIP(addr.ip()); + response.AddAttribute(addr_attr); + + // Send the response message. + // NOTE: If we wanted to, this is where we would add the HMAC. + ByteBuffer buf; + response.Write(&buf); + SendTo(buf.Data(), buf.Length(), addr, false); + + // The fact that we received a successful request means that this connection + // (if one exists) should now be readable. + Connection* conn = GetConnection(addr); + assert(conn); + if (conn) + conn->ReceivedPing(); +} + +void Port::SendBindingErrorResponse( + StunMessage* request, const SocketAddress& addr, int error_code, + const std::string& reason) { + + assert(request->type() == STUN_BINDING_REQUEST); + + // Retrieve the username from the request. If it didn't have one, we + // shouldn't be responding at all. + const StunByteStringAttribute* username_attr = + request->GetByteString(STUN_ATTR_USERNAME); + assert(username_attr); + + // Fill in the response message. + + StunMessage response; + response.SetType(STUN_BINDING_ERROR_RESPONSE); + response.SetTransactionID(request->transaction_id()); + + StunByteStringAttribute* username2_attr = + StunAttribute::CreateByteString(STUN_ATTR_USERNAME); + username2_attr->CopyBytes(username_attr->bytes(), username_attr->length()); + response.AddAttribute(username2_attr); + + StunErrorCodeAttribute* error_attr = StunAttribute::CreateErrorCode(); + error_attr->SetErrorCode(error_code); + error_attr->SetReason(reason); + response.AddAttribute(error_attr); + + // Send the response message. + // NOTE: If we wanted to, this is where we would add the HMAC. + ByteBuffer buf; + response.Write(&buf); + SendTo(buf.Data(), buf.Length(), addr, false); +} + +AsyncPacketSocket * Port::CreatePacketSocket(ProtocolType proto) { + if (proto == PROTO_UDP) { + return new AsyncUDPSocket(factory_->CreateAsyncSocket(SOCK_DGRAM)); + } else if ((proto == PROTO_TCP) || (proto == PROTO_SSLTCP)) { + AsyncSocket * socket = factory_->CreateAsyncSocket(SOCK_STREAM); + switch (proxy().type) { + case PROXY_NONE: + break; + case PROXY_SOCKS5: + socket = new AsyncSocksProxySocket(socket, proxy().address, proxy().username, proxy().password); + break; + case PROXY_HTTPS: + default: + socket = new AsyncHttpsProxySocket(socket, proxy().address, proxy().username, proxy().password); + break; + } + if (proto == PROTO_SSLTCP) { + socket = new AsyncSSLSocket(socket); + } + return new AsyncTCPSocket(socket); + } else { + LOG(INFO) << "Unknown protocol: " << proto; + return 0; + } +} + +void Port::OnMessage(Message *pmsg) { + assert(pmsg->message_id == MSG_CHECKTIMEOUT); + assert(lifetime_ == LT_PRETIMEOUT); + lifetime_ = LT_POSTTIMEOUT; + CheckTimeout(); +} + +void Port::Start() { + // The port sticks around for a minimum lifetime, after which + // we destroy it when it drops to zero connections. + if (lifetime_ == LT_PRESTART) { + lifetime_ = LT_PRETIMEOUT; + thread_->PostDelayed(kPortTimeoutDelay, this, MSG_CHECKTIMEOUT); + } else { + LOG(WARNING) << "Port restart attempted"; + } +} + +void Port::OnConnectionDestroyed(Connection* conn) { + AddressMap::iterator iter = connections_.find(conn->remote_candidate().address()); + assert(iter != connections_.end()); + connections_.erase(iter); + + CheckTimeout(); +} + +void Port::CheckTimeout() { + // If this port has no connections, then there's no reason to keep it around. + // When the connections time out (both read and write), they will delete + // themselves, so if we have any connections, they are either readable or + // writable (or still connecting). + if ((lifetime_ == LT_POSTTIMEOUT) && connections_.empty()) { + LOG(INFO) << "Destroying port: " << name_ << "-" << type_; + SignalDestroyed(this); + delete this; + } +} + +// A ConnectionRequest is a simple STUN ping used to determine writability. +class ConnectionRequest : public StunRequest { +public: + ConnectionRequest(Connection* connection) : connection_(connection) { + } + + virtual ~ConnectionRequest() { + } + + virtual void Prepare(StunMessage* request) { + request->SetType(STUN_BINDING_REQUEST); + StunByteStringAttribute* username_attr = + StunAttribute::CreateByteString(STUN_ATTR_USERNAME); + std::string username = connection_->remote_candidate().username(); + username.append(connection_->port()->username_fragment()); + username_attr->CopyBytes(username.c_str(), (uint16)username.size()); + request->AddAttribute(username_attr); + } + + virtual void OnResponse(StunMessage* response) { + connection_->OnConnectionRequestResponse(response, Elapsed()); + } + + virtual void OnErrorResponse(StunMessage* response) { + connection_->OnConnectionRequestErrorResponse(response, Elapsed()); + } + + virtual void OnTimeout() { + } + + virtual int GetNextDelay() { + // Each request is sent only once. After a single delay , the request will + // time out. + timeout_ = true; + return CONNECTION_RESPONSE_TIMEOUT; + } + +private: + Connection* connection_; +}; + +// +// Connection +// + +Connection::Connection(Port* port, size_t index, const Candidate& remote_candidate) + : requests_(port->thread()), port_(port), local_candidate_index_(index), + remote_candidate_(remote_candidate), read_state_(STATE_READ_TIMEOUT), + write_state_(STATE_WRITE_CONNECT), connected_(true), pruned_(false), + rtt_(0), rtt_data_points_(0), last_ping_sent_(0), last_ping_received_(0), + recv_total_bytes_(0), recv_bytes_second_(0), + last_recv_bytes_second_time_((uint32)-1), last_recv_bytes_second_calc_(0), + sent_total_bytes_(0), sent_bytes_second_(0), + last_sent_bytes_second_time_((uint32)-1), last_sent_bytes_second_calc_(0) { + + // Wire up to send stun packets + requests_.SignalSendPacket.connect(this, &Connection::OnSendStunPacket); +} + +Connection::~Connection() { +} + +const Candidate& Connection::local_candidate() const { + if (local_candidate_index_ < port_->candidates().size()) + return port_->candidates()[local_candidate_index_]; + assert(false); + static Candidate foo; + return foo; +} + +void Connection::set_read_state(ReadState value) { + ReadState old_value = read_state_; + read_state_ = value; + if (value != old_value) { + SignalStateChange(this); + CheckTimeout(); + } +} + +void Connection::set_write_state(WriteState value) { + WriteState old_value = write_state_; + write_state_ = value; + if (value != old_value) { + SignalStateChange(this); + CheckTimeout(); + } +} + +void Connection::set_connected(bool value) { + bool old_value = connected_; + connected_ = value; + + // When connectedness is turned off, this connection is done. + if (old_value && !value) + set_write_state(STATE_WRITE_TIMEOUT); +} + +void Connection::OnSendStunPacket(const void* data, size_t size) { + port_->SendTo(data, size, remote_candidate_.address(), false); +} + +void Connection::OnReadPacket(const char* data, size_t size) { + StunMessage* msg; + std::string remote_username; + const SocketAddress& addr(remote_candidate_.address()); + if (!port_->GetStunMessage(data, size, addr, msg, remote_username)) { + // The packet did not parse as a valid STUN message + + // If this connection is readable, then pass along the packet. + if (read_state_ == STATE_READABLE) { + // readable means data from this address is acceptable + // Send it on! + + recv_total_bytes_ += size; + SignalReadPacket(this, data, size); + + // If timed out sending writability checks, start up again + if (!pruned_ && (write_state_ == STATE_WRITE_TIMEOUT)) + set_write_state(STATE_WRITE_CONNECT); + } else { + // Not readable means the remote address hasn't send a valid + // binding request yet. + + LOG(WARNING) << "Received non-STUN packet from an unreadable connection."; + } + } else if (!msg) { + // The packet was STUN, but was already handled + } else if (remote_username != remote_candidate_.username()) { + // Not destined this connection + LOG(LERROR) << "Received STUN packet on wrong address."; + if (msg->type() == STUN_BINDING_REQUEST) { + port_->SendBindingErrorResponse(msg, addr, STUN_ERROR_BAD_REQUEST, + STUN_ERROR_REASON_BAD_REQUEST); + } + delete msg; + } else { + // The packet is STUN, with the current username + // If this is a STUN request, then update the readable bit and respond. + // If this is a STUN response, then update the writable bit. + + switch (msg->type()) { + case STUN_BINDING_REQUEST: + // Incoming, validated stun request from remote peer. + // This call will also set the connection readable. + + port_->SendBindingResponse(msg, addr); + + // If timed out sending writability checks, start up again + if (!pruned_ && (write_state_ == STATE_WRITE_TIMEOUT)) + set_write_state(STATE_WRITE_CONNECT); + break; + + case STUN_BINDING_RESPONSE: + case STUN_BINDING_ERROR_RESPONSE: + // Response from remote peer. Does it match request sent? + // This doesn't just check, it makes callbacks if transaction + // id's match + requests_.CheckResponse(msg); + break; + + default: + assert(false); + break; + } + + // Done with the message; delete + + delete msg; + } +} + +void Connection::Prune() { + pruned_ = true; + requests_.Clear(); + set_write_state(STATE_WRITE_TIMEOUT); +} + +void Connection::Destroy() { + set_read_state(STATE_READ_TIMEOUT); + set_write_state(STATE_WRITE_TIMEOUT); +} + +void Connection::UpdateState(uint32 now) { + // Check the readable state. + // + // Since we don't know how many pings the other side has attempted, the best + // test we can do is a simple window. + + if ((read_state_ == STATE_READABLE) && + (last_ping_received_ + CONNECTION_READ_TIMEOUT <= now)) { + set_read_state(STATE_READ_TIMEOUT); + } + + // Check the writable state. (The order of these checks is important.) + // + // Before becoming unwritable, we allow for a fixed number of pings to fail + // (i.e., receive no response). We also have to give the response time to + // get back, so we include a conservative estimate of this. + // + // Before timing out writability, we give a fixed amount of time. This is to + // allow for changes in network conditions. + + uint32 rtt = ConservativeRTTEstimate(rtt_, rtt_data_points_); + + if ((write_state_ == STATE_WRITABLE) && + TooManyFailures(pings_since_last_response_, + CONNECTION_WRITE_CONNECT_FAILURES, + rtt, + now) && + TooLongWithoutResponse(pings_since_last_response_, + CONNECTION_WRITE_CONNECT_TIMEOUT, + now)) { + set_write_state(STATE_WRITE_CONNECT); + } + + if ((write_state_ == STATE_WRITE_CONNECT) && + TooLongWithoutResponse(pings_since_last_response_, + CONNECTION_WRITE_TIMEOUT, + now)) { + set_write_state(STATE_WRITE_TIMEOUT); + } +} + +void Connection::Ping(uint32 now) { + assert(connected_); + last_ping_sent_ = now; + pings_since_last_response_.push_back(now); + requests_.Send(new ConnectionRequest(this)); +} + +void Connection::ReceivedPing() { + last_ping_received_ = Time(); + set_read_state(STATE_READABLE); +} + +void Connection::OnConnectionRequestResponse(StunMessage *response, uint32 rtt) { + // We have a potentially valid reply from the remote address. + // The packet must include a username that ends with our fragment, + // since it is a response. + + // Check exact message type + bool valid = true; + if (response->type() != STUN_BINDING_RESPONSE) + valid = false; + + // Must have username attribute + const StunByteStringAttribute* username_attr = + response->GetByteString(STUN_ATTR_USERNAME); + if (valid) { + if (!username_attr) { + LOG(LERROR) << "Received likely STUN packet with no username"; + valid = false; + } + } + + // Length must be at least the size of our fragment (actually, should + // be bigger since our fragment is at the end!) + if (valid) { + if (username_attr->length() <= port_->username_fragment().size()) { + LOG(LERROR) << "Received likely STUN packet with short username"; + valid = false; + } + } + + // Compare our fragment with the end of the username - must be exact match + if (valid) { + std::string username_fragment = port_->username_fragment(); + int offset = (int)(username_attr->length() - username_fragment.size()); + if (std::memcmp(username_attr->bytes() + offset, + username_fragment.c_str(), username_fragment.size()) != 0) { + LOG(LERROR) << "Received STUN response with bad username"; + valid = false; + } + } + + if (valid) { + // Valid response. If we're not already, become writable. We may be + // bringing a pruned connection back to life, but if we don't really want + // it, we can always prune it again. + set_write_state(STATE_WRITABLE); + + pings_since_last_response_.clear(); + rtt_ = (RTT_RATIO * rtt_ + rtt) / (RTT_RATIO + 1); + rtt_data_points_ += 1; + } +} + +void Connection::OnConnectionRequestErrorResponse(StunMessage *response, uint32 rtt) { + const StunErrorCodeAttribute* error = response->GetErrorCode(); + uint32 error_code = error ? error->error_code() : STUN_ERROR_GLOBAL_FAILURE; + + if ((error_code == STUN_ERROR_UNKNOWN_ATTRIBUTE) + || (error_code == STUN_ERROR_SERVER_ERROR) + || (error_code == STUN_ERROR_UNAUTHORIZED)) { + // Recoverable error, retry + } else if (error_code == STUN_ERROR_STALE_CREDENTIALS) { + // Race failure, retry + } else { + // This is not a valid connection. + set_connected(false); + } +} + +void Connection::CheckTimeout() { + // If both read and write have timed out, then this connection can contribute + // no more to p2p socket unless at some later date readability were to come + // back. However, we gave readability a long time to timeout, so at this + // point, it seems fair to get rid of this connectoin. + if ((read_state_ == STATE_READ_TIMEOUT) && + (write_state_ == STATE_WRITE_TIMEOUT)) { + port_->thread()->Post(this, MSG_DELETE); + } +} + +void Connection::OnMessage(Message *pmsg) { + assert(pmsg->message_id == MSG_DELETE); + + LOG(INFO) << "Destroying connection: from " + << local_candidate().address().ToString() + << " to " << remote_candidate_.address().ToString(); + + SignalDestroyed(this); + delete this; +} + +size_t Connection::recv_bytes_second() { + // Snapshot bytes / second calculator + + uint32 current_time = Time(); + if (last_recv_bytes_second_time_ != (uint32)-1) { + int delta = TimeDiff(current_time, last_recv_bytes_second_time_); + if (delta >= 1000) { + int fraction_time = delta % 1000; + int seconds_time = delta - fraction_time; + int fraction_bytes = (int)(recv_total_bytes_ - last_recv_bytes_second_calc_) * fraction_time / delta; + recv_bytes_second_ = (recv_total_bytes_ - last_recv_bytes_second_calc_ - fraction_bytes) * seconds_time / delta; + last_recv_bytes_second_time_ = current_time - fraction_time; + last_recv_bytes_second_calc_ = recv_total_bytes_ - fraction_bytes; + } + } + if (last_recv_bytes_second_time_ == (uint32)-1) { + last_recv_bytes_second_time_ = current_time; + last_recv_bytes_second_calc_ = recv_total_bytes_; + } + + return recv_bytes_second_; +} + +size_t Connection::recv_total_bytes() { + return recv_total_bytes_; +} + +size_t Connection::sent_bytes_second() { + // Snapshot bytes / second calculator + + uint32 current_time = Time(); + if (last_sent_bytes_second_time_ != (uint32)-1) { + int delta = TimeDiff(current_time, last_sent_bytes_second_time_); + if (delta >= 1000) { + int fraction_time = delta % 1000; + int seconds_time = delta - fraction_time; + int fraction_bytes = (int)(sent_total_bytes_ - last_sent_bytes_second_calc_) * fraction_time / delta; + sent_bytes_second_ = (sent_total_bytes_ - last_sent_bytes_second_calc_ - fraction_bytes) * seconds_time / delta; + last_sent_bytes_second_time_ = current_time - fraction_time; + last_sent_bytes_second_calc_ = sent_total_bytes_ - fraction_bytes; + } + } + if (last_sent_bytes_second_time_ == (uint32)-1) { + last_sent_bytes_second_time_ = current_time; + last_sent_bytes_second_calc_ = sent_total_bytes_; + } + + return sent_bytes_second_; +} + +size_t Connection::sent_total_bytes() { + return sent_total_bytes_; +} + +ProxyConnection::ProxyConnection(Port* port, size_t index, const Candidate& candidate) + : Connection(port, index, candidate), error_(0) { +} + +int ProxyConnection::Send(const void* data, size_t size) { + if (write_state() != STATE_WRITABLE) { + error_ = EWOULDBLOCK; + return SOCKET_ERROR; + } + int sent = port_->SendTo(data, size, remote_candidate_.address(), true); + if (sent <= 0) { + assert(sent < 0); + error_ = port_->GetError(); + } else { + sent_total_bytes_ += sent; + } + return sent; +} + +} // namespace cricket |