// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/socket/ssl_client_socket_pool.h"

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/values.h"
#include "net/base/net_errors.h"
#include "net/base/host_port_pair.h"
#include "net/base/ssl_cert_request_info.h"
#include "net/http/http_proxy_client_socket.h"
#include "net/http/http_proxy_client_socket_pool.h"
#include "net/socket/client_socket_factory.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/socks_client_socket_pool.h"
#include "net/socket/ssl_client_socket.h"
#include "net/socket/transport_client_socket_pool.h"

namespace net {

SSLSocketParams::SSLSocketParams(
    const scoped_refptr<TransportSocketParams>& transport_params,
    const scoped_refptr<SOCKSSocketParams>& socks_params,
    const scoped_refptr<HttpProxySocketParams>& http_proxy_params,
    ProxyServer::Scheme proxy,
    const HostPortPair& host_and_port,
    const SSLConfig& ssl_config,
    int load_flags,
    bool force_spdy_over_ssl,
    bool want_spdy_over_npn)
    : transport_params_(transport_params),
      http_proxy_params_(http_proxy_params),
      socks_params_(socks_params),
      proxy_(proxy),
      host_and_port_(host_and_port),
      ssl_config_(ssl_config),
      load_flags_(load_flags),
      force_spdy_over_ssl_(force_spdy_over_ssl),
      want_spdy_over_npn_(want_spdy_over_npn),
      ignore_limits_(false) {
  switch (proxy_) {
    case ProxyServer::SCHEME_DIRECT:
      DCHECK(transport_params_.get() != NULL);
      DCHECK(http_proxy_params_.get() == NULL);
      DCHECK(socks_params_.get() == NULL);
      ignore_limits_ = transport_params_->ignore_limits();
      break;
    case ProxyServer::SCHEME_HTTP:
    case ProxyServer::SCHEME_HTTPS:
      DCHECK(transport_params_.get() == NULL);
      DCHECK(http_proxy_params_.get() != NULL);
      DCHECK(socks_params_.get() == NULL);
      ignore_limits_ = http_proxy_params_->ignore_limits();
      break;
    case ProxyServer::SCHEME_SOCKS4:
    case ProxyServer::SCHEME_SOCKS5:
      DCHECK(transport_params_.get() == NULL);
      DCHECK(http_proxy_params_.get() == NULL);
      DCHECK(socks_params_.get() != NULL);
      ignore_limits_ = socks_params_->ignore_limits();
      break;
    default:
      LOG(DFATAL) << "unknown proxy type";
      break;
  }
}

SSLSocketParams::~SSLSocketParams() {}

// Timeout for the SSL handshake portion of the connect.
static const int kSSLHandshakeTimeoutInSeconds = 30;

SSLConnectJob::SSLConnectJob(const std::string& group_name,
                             const scoped_refptr<SSLSocketParams>& params,
                             const base::TimeDelta& timeout_duration,
                             TransportClientSocketPool* transport_pool,
                             SOCKSClientSocketPool* socks_pool,
                             HttpProxyClientSocketPool* http_proxy_pool,
                             ClientSocketFactory* client_socket_factory,
                             HostResolver* host_resolver,
                             const SSLClientSocketContext& context,
                             Delegate* delegate,
                             NetLog* net_log)
    : ConnectJob(group_name, timeout_duration, delegate,
                 BoundNetLog::Make(net_log, NetLog::SOURCE_CONNECT_JOB)),
      params_(params),
      transport_pool_(transport_pool),
      socks_pool_(socks_pool),
      http_proxy_pool_(http_proxy_pool),
      client_socket_factory_(client_socket_factory),
      host_resolver_(host_resolver),
      context_(context),
      ALLOW_THIS_IN_INITIALIZER_LIST(
          callback_(base::Bind(&SSLConnectJob::OnIOComplete,
                               base::Unretained(this)))) {}

SSLConnectJob::~SSLConnectJob() {}

LoadState SSLConnectJob::GetLoadState() const {
  switch (next_state_) {
    case STATE_TUNNEL_CONNECT_COMPLETE:
      if (transport_socket_handle_->socket())
        return LOAD_STATE_ESTABLISHING_PROXY_TUNNEL;
      // else, fall through.
    case STATE_TRANSPORT_CONNECT:
    case STATE_TRANSPORT_CONNECT_COMPLETE:
    case STATE_SOCKS_CONNECT:
    case STATE_SOCKS_CONNECT_COMPLETE:
    case STATE_TUNNEL_CONNECT:
      return transport_socket_handle_->GetLoadState();
    case STATE_SSL_CONNECT:
    case STATE_SSL_CONNECT_COMPLETE:
      return LOAD_STATE_SSL_HANDSHAKE;
    default:
      NOTREACHED();
      return LOAD_STATE_IDLE;
  }
}

void SSLConnectJob::GetAdditionalErrorState(ClientSocketHandle* handle) {
  // Headers in |error_response_info_| indicate a proxy tunnel setup
  // problem. See DoTunnelConnectComplete.
  if (error_response_info_.headers) {
    handle->set_pending_http_proxy_connection(
        transport_socket_handle_.release());
  }
  handle->set_ssl_error_response_info(error_response_info_);
  if (!ssl_connect_start_time_.is_null())
    handle->set_is_ssl_error(true);
}

void SSLConnectJob::OnIOComplete(int result) {
  int rv = DoLoop(result);
  if (rv != ERR_IO_PENDING)
    NotifyDelegateOfCompletion(rv);  // Deletes |this|.
}

int SSLConnectJob::DoLoop(int result) {
  DCHECK_NE(next_state_, STATE_NONE);

  int rv = result;
  do {
    State state = next_state_;
    next_state_ = STATE_NONE;
    switch (state) {
      case STATE_TRANSPORT_CONNECT:
        DCHECK_EQ(OK, rv);
        rv = DoTransportConnect();
        break;
      case STATE_TRANSPORT_CONNECT_COMPLETE:
        rv = DoTransportConnectComplete(rv);
        break;
      case STATE_SOCKS_CONNECT:
        DCHECK_EQ(OK, rv);
        rv = DoSOCKSConnect();
        break;
      case STATE_SOCKS_CONNECT_COMPLETE:
        rv = DoSOCKSConnectComplete(rv);
        break;
      case STATE_TUNNEL_CONNECT:
        DCHECK_EQ(OK, rv);
        rv = DoTunnelConnect();
        break;
      case STATE_TUNNEL_CONNECT_COMPLETE:
        rv = DoTunnelConnectComplete(rv);
        break;
      case STATE_SSL_CONNECT:
        DCHECK_EQ(OK, rv);
        rv = DoSSLConnect();
        break;
      case STATE_SSL_CONNECT_COMPLETE:
        rv = DoSSLConnectComplete(rv);
        break;
      default:
        NOTREACHED() << "bad state";
        rv = ERR_FAILED;
        break;
    }
  } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);

  return rv;
}

int SSLConnectJob::DoTransportConnect() {
  DCHECK(transport_pool_);

  next_state_ = STATE_TRANSPORT_CONNECT_COMPLETE;
  transport_socket_handle_.reset(new ClientSocketHandle());
  scoped_refptr<TransportSocketParams> transport_params =
      params_->transport_params();
  return transport_socket_handle_->Init(
      group_name(), transport_params,
      transport_params->destination().priority(), callback_, transport_pool_,
      net_log());
}

int SSLConnectJob::DoTransportConnectComplete(int result) {
  if (result == OK)
    next_state_ = STATE_SSL_CONNECT;

  return result;
}

int SSLConnectJob::DoSOCKSConnect() {
  DCHECK(socks_pool_);
  next_state_ = STATE_SOCKS_CONNECT_COMPLETE;
  transport_socket_handle_.reset(new ClientSocketHandle());
  scoped_refptr<SOCKSSocketParams> socks_params = params_->socks_params();
  return transport_socket_handle_->Init(
      group_name(), socks_params, socks_params->destination().priority(),
      callback_, socks_pool_, net_log());
}

int SSLConnectJob::DoSOCKSConnectComplete(int result) {
  if (result == OK)
    next_state_ = STATE_SSL_CONNECT;

  return result;
}

int SSLConnectJob::DoTunnelConnect() {
  DCHECK(http_proxy_pool_);
  next_state_ = STATE_TUNNEL_CONNECT_COMPLETE;

  transport_socket_handle_.reset(new ClientSocketHandle());
  scoped_refptr<HttpProxySocketParams> http_proxy_params =
      params_->http_proxy_params();
  return transport_socket_handle_->Init(
      group_name(), http_proxy_params,
      http_proxy_params->destination().priority(), callback_, http_proxy_pool_,
      net_log());
}

int SSLConnectJob::DoTunnelConnectComplete(int result) {
  // Extract the information needed to prompt for appropriate proxy
  // authentication so that when ClientSocketPoolBaseHelper calls
  // |GetAdditionalErrorState|, we can easily set the state.
  if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
    error_response_info_ = transport_socket_handle_->ssl_error_response_info();
  } else if (result == ERR_PROXY_AUTH_REQUESTED ||
             result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
    StreamSocket* socket = transport_socket_handle_->socket();
    HttpProxyClientSocket* tunnel_socket =
        static_cast<HttpProxyClientSocket*>(socket);
    error_response_info_ = *tunnel_socket->GetConnectResponseInfo();
  }
  if (result < 0)
    return result;

  next_state_ = STATE_SSL_CONNECT;
  return result;
}

int SSLConnectJob::DoSSLConnect() {
  next_state_ = STATE_SSL_CONNECT_COMPLETE;
  // Reset the timeout to just the time allowed for the SSL handshake.
  ResetTimer(base::TimeDelta::FromSeconds(kSSLHandshakeTimeoutInSeconds));
  ssl_connect_start_time_ = base::TimeTicks::Now();

  ssl_socket_.reset(client_socket_factory_->CreateSSLClientSocket(
      transport_socket_handle_.release(), params_->host_and_port(),
      params_->ssl_config(), context_));
  return ssl_socket_->Connect(callback_);
}

int SSLConnectJob::DoSSLConnectComplete(int result) {
  SSLClientSocket::NextProtoStatus status =
      SSLClientSocket::kNextProtoUnsupported;
  std::string proto;
  std::string server_protos;
  // GetNextProto will fail and and trigger a NOTREACHED if we pass in a socket
  // that hasn't had SSL_ImportFD called on it. If we get a certificate error
  // here, then we know that we called SSL_ImportFD.
  if (result == OK || IsCertificateError(result))
    status = ssl_socket_->GetNextProto(&proto, &server_protos);

  // If we want spdy over npn, make sure it succeeded.
  if (status == SSLClientSocket::kNextProtoNegotiated) {
    ssl_socket_->set_was_npn_negotiated(true);
    NextProto protocol_negotiated =
        SSLClientSocket::NextProtoFromString(proto);
    ssl_socket_->set_protocol_negotiated(protocol_negotiated);
    // If we negotiated either version of SPDY, we must have
    // advertised it, so allow it.
    // TODO(mbelshe): verify it was a protocol we advertised?
    if (protocol_negotiated == kProtoSPDY1 ||
        protocol_negotiated == kProtoSPDY2 ||
        protocol_negotiated == kProtoSPDY3) {
      ssl_socket_->set_was_spdy_negotiated(true);
    }
  }
  if (params_->want_spdy_over_npn() && !ssl_socket_->was_spdy_negotiated())
    return ERR_NPN_NEGOTIATION_FAILED;

  // Spdy might be turned on by default, or it might be over npn.
  bool using_spdy = params_->force_spdy_over_ssl() ||
      params_->want_spdy_over_npn();

  if (result == OK ||
      ssl_socket_->IgnoreCertError(result, params_->load_flags())) {
    DCHECK(ssl_connect_start_time_ != base::TimeTicks());
    base::TimeDelta connect_duration =
        base::TimeTicks::Now() - ssl_connect_start_time_;
    if (using_spdy) {
      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SpdyConnectionLatency",
                                 connect_duration,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMinutes(10),
                                 100);
    }

    UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency",
                               connect_duration,
                               base::TimeDelta::FromMilliseconds(1),
                               base::TimeDelta::FromMinutes(10),
                               100);

    SSLInfo ssl_info;
    ssl_socket_->GetSSLInfo(&ssl_info);

    if (ssl_info.handshake_type == SSLInfo::HANDSHAKE_RESUME) {
      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Resume_Handshake",
                                 connect_duration,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMinutes(1),
                                 100);
    } else if (ssl_info.handshake_type == SSLInfo::HANDSHAKE_FULL) {
      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Full_Handshake",
                                 connect_duration,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMinutes(1),
                                 100);
    }

    const std::string& host = params_->host_and_port().host();
    bool is_google = host == "google.com" ||
                     (host.size() > 11 &&
                      host.rfind(".google.com") == host.size() - 11);
    if (is_google) {
      UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Google",
                                 connect_duration,
                                 base::TimeDelta::FromMilliseconds(1),
                                 base::TimeDelta::FromMinutes(10),
                                 100);
      if (ssl_info.handshake_type == SSLInfo::HANDSHAKE_RESUME) {
        UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Google_"
                                       "Resume_Handshake",
                                   connect_duration,
                                   base::TimeDelta::FromMilliseconds(1),
                                   base::TimeDelta::FromMinutes(1),
                                   100);
      } else if (ssl_info.handshake_type == SSLInfo::HANDSHAKE_FULL) {
        UMA_HISTOGRAM_CUSTOM_TIMES("Net.SSL_Connection_Latency_Google_"
                                       "Full_Handshake",
                                   connect_duration,
                                   base::TimeDelta::FromMilliseconds(1),
                                   base::TimeDelta::FromMinutes(1),
                                   100);
      }
    }
  }

  if (result == OK || IsCertificateError(result)) {
    set_socket(ssl_socket_.release());
  } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
    error_response_info_.cert_request_info = new SSLCertRequestInfo;
    ssl_socket_->GetSSLCertRequestInfo(error_response_info_.cert_request_info);
  }

  return result;
}

int SSLConnectJob::ConnectInternal() {
  switch (params_->proxy()) {
    case ProxyServer::SCHEME_DIRECT:
      next_state_ = STATE_TRANSPORT_CONNECT;
      break;
    case ProxyServer::SCHEME_HTTP:
    case ProxyServer::SCHEME_HTTPS:
      next_state_ = STATE_TUNNEL_CONNECT;
      break;
    case ProxyServer::SCHEME_SOCKS4:
    case ProxyServer::SCHEME_SOCKS5:
      next_state_ = STATE_SOCKS_CONNECT;
      break;
    default:
      NOTREACHED() << "unknown proxy type";
      break;
  }
  return DoLoop(OK);
}

SSLClientSocketPool::SSLConnectJobFactory::SSLConnectJobFactory(
    TransportClientSocketPool* transport_pool,
    SOCKSClientSocketPool* socks_pool,
    HttpProxyClientSocketPool* http_proxy_pool,
    ClientSocketFactory* client_socket_factory,
    HostResolver* host_resolver,
    const SSLClientSocketContext& context,
    NetLog* net_log)
    : transport_pool_(transport_pool),
      socks_pool_(socks_pool),
      http_proxy_pool_(http_proxy_pool),
      client_socket_factory_(client_socket_factory),
      host_resolver_(host_resolver),
      context_(context),
      net_log_(net_log) {
  base::TimeDelta max_transport_timeout = base::TimeDelta();
  base::TimeDelta pool_timeout;
  if (transport_pool_)
    max_transport_timeout = transport_pool_->ConnectionTimeout();
  if (socks_pool_) {
    pool_timeout = socks_pool_->ConnectionTimeout();
    if (pool_timeout > max_transport_timeout)
      max_transport_timeout = pool_timeout;
  }
  if (http_proxy_pool_) {
    pool_timeout = http_proxy_pool_->ConnectionTimeout();
    if (pool_timeout > max_transport_timeout)
      max_transport_timeout = pool_timeout;
  }
  timeout_ = max_transport_timeout +
      base::TimeDelta::FromSeconds(kSSLHandshakeTimeoutInSeconds);
}

SSLClientSocketPool::SSLClientSocketPool(
    int max_sockets,
    int max_sockets_per_group,
    ClientSocketPoolHistograms* histograms,
    HostResolver* host_resolver,
    CertVerifier* cert_verifier,
    ServerBoundCertService* server_bound_cert_service,
    TransportSecurityState* transport_security_state,
    const std::string& ssl_session_cache_shard,
    ClientSocketFactory* client_socket_factory,
    TransportClientSocketPool* transport_pool,
    SOCKSClientSocketPool* socks_pool,
    HttpProxyClientSocketPool* http_proxy_pool,
    SSLConfigService* ssl_config_service,
    NetLog* net_log)
    : transport_pool_(transport_pool),
      socks_pool_(socks_pool),
      http_proxy_pool_(http_proxy_pool),
      base_(max_sockets, max_sockets_per_group, histograms,
            ClientSocketPool::unused_idle_socket_timeout(),
            ClientSocketPool::used_idle_socket_timeout(),
            new SSLConnectJobFactory(transport_pool,
                                     socks_pool,
                                     http_proxy_pool,
                                     client_socket_factory,
                                     host_resolver,
                                     SSLClientSocketContext(
                                         cert_verifier,
                                         server_bound_cert_service,
                                         transport_security_state,
                                         ssl_session_cache_shard),
                                     net_log)),
      ssl_config_service_(ssl_config_service) {
  if (ssl_config_service_)
    ssl_config_service_->AddObserver(this);
  if (transport_pool_)
    transport_pool_->AddLayeredPool(this);
  if (socks_pool_)
    socks_pool_->AddLayeredPool(this);
  if (http_proxy_pool_)
    http_proxy_pool_->AddLayeredPool(this);
}

SSLClientSocketPool::~SSLClientSocketPool() {
  if (http_proxy_pool_)
    http_proxy_pool_->RemoveLayeredPool(this);
  if (socks_pool_)
    socks_pool_->RemoveLayeredPool(this);
  if (transport_pool_)
    transport_pool_->RemoveLayeredPool(this);
  if (ssl_config_service_)
    ssl_config_service_->RemoveObserver(this);
}

ConnectJob* SSLClientSocketPool::SSLConnectJobFactory::NewConnectJob(
    const std::string& group_name,
    const PoolBase::Request& request,
    ConnectJob::Delegate* delegate) const {
  return new SSLConnectJob(group_name, request.params(), ConnectionTimeout(),
                           transport_pool_, socks_pool_, http_proxy_pool_,
                           client_socket_factory_, host_resolver_,
                           context_, delegate, net_log_);
}

base::TimeDelta
SSLClientSocketPool::SSLConnectJobFactory::ConnectionTimeout() const {
  return timeout_;
}

int SSLClientSocketPool::RequestSocket(const std::string& group_name,
                                       const void* socket_params,
                                       RequestPriority priority,
                                       ClientSocketHandle* handle,
                                       const CompletionCallback& callback,
                                       const BoundNetLog& net_log) {
  const scoped_refptr<SSLSocketParams>* casted_socket_params =
      static_cast<const scoped_refptr<SSLSocketParams>*>(socket_params);

  return base_.RequestSocket(group_name, *casted_socket_params, priority,
                             handle, callback, net_log);
}

void SSLClientSocketPool::RequestSockets(
    const std::string& group_name,
    const void* params,
    int num_sockets,
    const BoundNetLog& net_log) {
  const scoped_refptr<SSLSocketParams>* casted_params =
      static_cast<const scoped_refptr<SSLSocketParams>*>(params);

  base_.RequestSockets(group_name, *casted_params, num_sockets, net_log);
}

void SSLClientSocketPool::CancelRequest(const std::string& group_name,
                                        ClientSocketHandle* handle) {
  base_.CancelRequest(group_name, handle);
}

void SSLClientSocketPool::ReleaseSocket(const std::string& group_name,
                                        StreamSocket* socket, int id) {
  base_.ReleaseSocket(group_name, socket, id);
}

void SSLClientSocketPool::Flush() {
  base_.Flush();
}

bool SSLClientSocketPool::IsStalled() const {
  return base_.IsStalled() ||
      (transport_pool_ && transport_pool_->IsStalled()) ||
      (socks_pool_ && socks_pool_->IsStalled()) ||
      (http_proxy_pool_ && http_proxy_pool_->IsStalled());
}

void SSLClientSocketPool::CloseIdleSockets() {
  base_.CloseIdleSockets();
}

int SSLClientSocketPool::IdleSocketCount() const {
  return base_.idle_socket_count();
}

int SSLClientSocketPool::IdleSocketCountInGroup(
    const std::string& group_name) const {
  return base_.IdleSocketCountInGroup(group_name);
}

LoadState SSLClientSocketPool::GetLoadState(
    const std::string& group_name, const ClientSocketHandle* handle) const {
  return base_.GetLoadState(group_name, handle);
}

void SSLClientSocketPool::AddLayeredPool(LayeredPool* layered_pool) {
  base_.AddLayeredPool(layered_pool);
}

void SSLClientSocketPool::RemoveLayeredPool(LayeredPool* layered_pool) {
  base_.RemoveLayeredPool(layered_pool);
}

DictionaryValue* SSLClientSocketPool::GetInfoAsValue(
    const std::string& name,
    const std::string& type,
    bool include_nested_pools) const {
  DictionaryValue* dict = base_.GetInfoAsValue(name, type);
  if (include_nested_pools) {
    ListValue* list = new ListValue();
    if (transport_pool_) {
      list->Append(transport_pool_->GetInfoAsValue("transport_socket_pool",
                                                   "transport_socket_pool",
                                                   false));
    }
    if (socks_pool_) {
      list->Append(socks_pool_->GetInfoAsValue("socks_pool",
                                               "socks_pool",
                                               true));
    }
    if (http_proxy_pool_) {
      list->Append(http_proxy_pool_->GetInfoAsValue("http_proxy_pool",
                                                    "http_proxy_pool",
                                                    true));
    }
    dict->Set("nested_pools", list);
  }
  return dict;
}

base::TimeDelta SSLClientSocketPool::ConnectionTimeout() const {
  return base_.ConnectionTimeout();
}

ClientSocketPoolHistograms* SSLClientSocketPool::histograms() const {
  return base_.histograms();
}

void SSLClientSocketPool::OnSSLConfigChanged() {
  Flush();
}

bool SSLClientSocketPool::CloseOneIdleConnection() {
  if (base_.CloseOneIdleSocket())
    return true;
  return base_.CloseOneIdleConnectionInLayeredPool();
}

}  // namespace net