Refactoring that removes P2PTransport and DtlsTransport classes.

webrtc/p2p/base/transport.cc

Index: webrtc/p2p/base/transport.cc
diff --git a/webrtc/p2p/base/transport.cc b/webrtc/p2p/base/transport.cc
deleted file mode 100644
index 7bd14c4cad1b8989755c7e6eba61f7ffcaf74c37..0000000000000000000000000000000000000000
--- a/webrtc/p2p/base/transport.cc
+++ /dev/null
@@ -1,472 +0,0 @@
-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include <memory>
-#include <utility>  // for std::pair
-
-#include "webrtc/p2p/base/transport.h"
-
-#include "webrtc/p2p/base/candidate.h"
-#include "webrtc/p2p/base/p2pconstants.h"
-#include "webrtc/p2p/base/port.h"
-#include "webrtc/p2p/base/transportchannelimpl.h"
-#include "webrtc/base/bind.h"
-#include "webrtc/base/checks.h"
-#include "webrtc/base/logging.h"
-
-namespace cricket {
-
-static bool VerifyIceParams(const TransportDescription& desc) {
-  // For legacy protocols.
-  if (desc.ice_ufrag.empty() && desc.ice_pwd.empty())
-    return true;
-
-  if (desc.ice_ufrag.length() < ICE_UFRAG_MIN_LENGTH ||
-      desc.ice_ufrag.length() > ICE_UFRAG_MAX_LENGTH) {
-    return false;
-  }
-  if (desc.ice_pwd.length() < ICE_PWD_MIN_LENGTH ||
-      desc.ice_pwd.length() > ICE_PWD_MAX_LENGTH) {
-    return false;
-  }
-  return true;
-}
-
-bool BadTransportDescription(const std::string& desc, std::string* err_desc) {
-  if (err_desc) {
-    *err_desc = desc;
-  }
-  LOG(LS_ERROR) << desc;
-  return false;
-}
-
-bool IceCredentialsChanged(const std::string& old_ufrag,
-                           const std::string& old_pwd,
-                           const std::string& new_ufrag,
-                           const std::string& new_pwd) {
-  // The standard (RFC 5245 Section 9.1.1.1) says that ICE restarts MUST change
-  // both the ufrag and password. However, section 9.2.1.1 says changing the
-  // ufrag OR password indicates an ICE restart. So, to keep compatibility with
-  // endpoints that only change one, we'll treat this as an ICE restart.
-  return (old_ufrag != new_ufrag) || (old_pwd != new_pwd);
-}
-
-Transport::Transport(const std::string& name, PortAllocator* allocator)
-    : name_(name), allocator_(allocator) {}
-
-Transport::~Transport() {
-  RTC_DCHECK(channels_destroyed_);
-}
-
-void Transport::SetIceRole(IceRole role) {
-  ice_role_ = role;
-  for (const auto& kv : channels_) {
-    kv.second->SetIceRole(ice_role_);
-  }
-}
-
-std::unique_ptr<rtc::SSLCertificate> Transport::GetRemoteSSLCertificate() {
-  if (channels_.empty()) {
-    return nullptr;
-  }
-
-  auto iter = channels_.begin();
-  return iter->second->GetRemoteSSLCertificate();
-}
-
-void Transport::SetIceConfig(const IceConfig& config) {
-  ice_config_ = config;
-  for (const auto& kv : channels_) {
-    kv.second->SetIceConfig(ice_config_);
-  }
-}
-
-bool Transport::SetLocalTransportDescription(
-    const TransportDescription& description,
-    ContentAction action,
-    std::string* error_desc) {
-  bool ret = true;
-
-  if (!VerifyIceParams(description)) {
-    return BadTransportDescription("Invalid ice-ufrag or ice-pwd length",
-                                   error_desc);
-  }
-
-  local_description_.reset(new TransportDescription(description));
-
-  for (const auto& kv : channels_) {
-    ret &= ApplyLocalTransportDescription(kv.second, error_desc);
-  }
-  if (!ret) {
-    return false;
-  }
-
-  // If PRANSWER/ANSWER is set, we should decide transport protocol type.
-  if (action == CA_PRANSWER || action == CA_ANSWER) {
-    ret &= NegotiateTransportDescription(action, error_desc);
-  }
-  if (ret) {
-    local_description_set_ = true;
-  }
-
-  return ret;
-}
-
-bool Transport::SetRemoteTransportDescription(
-    const TransportDescription& description,
-    ContentAction action,
-    std::string* error_desc) {
-  bool ret = true;
-
-  if (!VerifyIceParams(description)) {
-    return BadTransportDescription("Invalid ice-ufrag or ice-pwd length",
-                                   error_desc);
-  }
-
-  remote_description_.reset(new TransportDescription(description));
-  for (const auto& kv : channels_) {
-    ret &= ApplyRemoteTransportDescription(kv.second, error_desc);
-  }
-
-  // If PRANSWER/ANSWER is set, we should decide transport protocol type.
-  if (action == CA_PRANSWER || action == CA_ANSWER) {
-    ret = NegotiateTransportDescription(CA_OFFER, error_desc);
-  }
-  if (ret) {
-    remote_description_set_ = true;
-  }
-
-  return ret;
-}
-
-TransportChannelImpl* Transport::CreateChannel(int component) {
-  TransportChannelImpl* channel;
-
-  // Create the entry if it does not exist.
-  bool channel_exists = false;
-  auto iter = channels_.find(component);
-  if (iter == channels_.end()) {
-    channel = CreateTransportChannel(component);
-    channels_.insert(std::pair<int, TransportChannelImpl*>(component, channel));
-  } else {
-    channel = iter->second;
-    channel_exists = true;
-  }
-
-  channels_destroyed_ = false;
-
-  if (channel_exists) {
-    // If this is an existing channel, we should just return it.
-    return channel;
-  }
-
-  // Push down our transport state to the new channel.
-  channel->SetIceRole(ice_role_);
-  channel->SetIceTiebreaker(tiebreaker_);
-  channel->SetIceConfig(ice_config_);
-  // TODO(ronghuawu): Change CreateChannel to be able to return error since
-  // below Apply**Description calls can fail.
-  if (local_description_)
-    ApplyLocalTransportDescription(channel, nullptr);
-  if (remote_description_)
-    ApplyRemoteTransportDescription(channel, nullptr);
-  if (local_description_ && remote_description_)
-    ApplyNegotiatedTransportDescription(channel, nullptr);
-
-  return channel;
-}
-
-TransportChannelImpl* Transport::GetChannel(int component) {
-  auto iter = channels_.find(component);
-  return (iter != channels_.end()) ? iter->second : nullptr;
-}
-
-bool Transport::HasChannels() {
-  return !channels_.empty();
-}
-
-void Transport::DestroyChannel(int component) {
-  auto iter = channels_.find(component);
-  if (iter == channels_.end())
-    return;
-
-  TransportChannelImpl* channel = iter->second;
-  channels_.erase(iter);
-  DestroyTransportChannel(channel);
-}
-
-void Transport::MaybeStartGathering() {
-  CallChannels(&TransportChannelImpl::MaybeStartGathering);
-}
-
-void Transport::DestroyAllChannels() {
-  for (const auto& kv : channels_) {
-    DestroyTransportChannel(kv.second);
-  }
-  channels_.clear();
-  channels_destroyed_ = true;
-}
-
-void Transport::CallChannels(TransportChannelFunc func) {
-  for (const auto& kv : channels_) {
-    (kv.second->*func)();
-  }
-}
-
-bool Transport::VerifyCandidate(const Candidate& cand, std::string* error) {
-  // No address zero.
-  if (cand.address().IsNil() || cand.address().IsAnyIP()) {
-    *error = "candidate has address of zero";
-    return false;
-  }
-
-  // Disallow all ports below 1024, except for 80 and 443 on public addresses.
-  int port = cand.address().port();
-  if (cand.protocol() == TCP_PROTOCOL_NAME &&
-      (cand.tcptype() == TCPTYPE_ACTIVE_STR || port == 0)) {
-    // Expected for active-only candidates per
-    // http://tools.ietf.org/html/rfc6544#section-4.5 so no error.
-    // Libjingle clients emit port 0, in "active" mode.
-    return true;
-  }
-  if (port < 1024) {
-    if ((port != 80) && (port != 443)) {
-      *error = "candidate has port below 1024, but not 80 or 443";
-      return false;
-    }
-
-    if (cand.address().IsPrivateIP()) {
-      *error = "candidate has port of 80 or 443 with private IP address";
-      return false;
-    }
-  }
-
-  if (!HasChannel(cand.component())) {
-    *error = "Candidate has an unknown component: " + cand.ToString() +
-             " for content: " + name();
-    return false;
-  }
-
-  return true;
-}
-
-bool Transport::VerifyCandidates(const Candidates& candidates,
-                                 std::string* error) {
-  for (const Candidate& candidate : candidates) {
-    if (!VerifyCandidate(candidate, error)) {
-      return false;
-    }
-  }
-  return true;
-}
-
-
-bool Transport::GetStats(TransportStats* stats) {
-  stats->transport_name = name();
-  stats->channel_stats.clear();
-  for (auto kv : channels_) {
-    TransportChannelImpl* channel = kv.second;
-    TransportChannelStats substats;
-    substats.component = channel->component();
-    channel->GetSrtpCryptoSuite(&substats.srtp_crypto_suite);
-    channel->GetSslCipherSuite(&substats.ssl_cipher_suite);
-    if (!channel->GetStats(&substats.connection_infos)) {
-      return false;
-    }
-    stats->channel_stats.push_back(substats);
-  }
-  return true;
-}
-
-bool Transport::AddRemoteCandidates(const std::vector<Candidate>& candidates,
-                                    std::string* error) {
-  ASSERT(!channels_destroyed_);
-  // Verify each candidate before passing down to the transport layer.
-  if (!VerifyCandidates(candidates, error)) {
-    return false;
-  }
-
-  for (const Candidate& candidate : candidates) {
-    TransportChannelImpl* channel = GetChannel(candidate.component());
-    if (channel != nullptr) {
-      channel->AddRemoteCandidate(candidate);
-    }
-  }
-  return true;
-}
-
-bool Transport::RemoveRemoteCandidates(const std::vector<Candidate>& candidates,
-                                       std::string* error) {
-  ASSERT(!channels_destroyed_);
-  // Verify each candidate before passing down to the transport layer.
-  if (!VerifyCandidates(candidates, error)) {
-    return false;
-  }
-
-  for (const Candidate& candidate : candidates) {
-    TransportChannelImpl* channel = GetChannel(candidate.component());
-    if (channel != nullptr) {
-      channel->RemoveRemoteCandidate(candidate);
-    }
-  }
-  return true;
-}
-
-bool Transport::ApplyLocalTransportDescription(TransportChannelImpl* ch,
-                                               std::string* error_desc) {
-  ch->SetIceParameters(local_description_->GetIceParameters());
-  return true;
-}
-
-bool Transport::ApplyRemoteTransportDescription(TransportChannelImpl* ch,
-                                                std::string* error_desc) {
-  ch->SetRemoteIceParameters(remote_description_->GetIceParameters());
-  return true;
-}
-
-bool Transport::ApplyNegotiatedTransportDescription(
-    TransportChannelImpl* channel,
-    std::string* error_desc) {
-  channel->SetRemoteIceMode(remote_ice_mode_);
-  return true;
-}
-
-bool Transport::NegotiateTransportDescription(ContentAction local_role,
-                                              std::string* error_desc) {
-  // TODO(ekr@rtfm.com): This is ICE-specific stuff. Refactor into
-  // P2PTransport.
-
-  // If transport is in ICEROLE_CONTROLLED and remote end point supports only
-  // ice_lite, this local end point should take CONTROLLING role.
-  if (ice_role_ == ICEROLE_CONTROLLED &&
-      remote_description_->ice_mode == ICEMODE_LITE) {
-    SetIceRole(ICEROLE_CONTROLLING);
-  }
-
-  // Update remote ice_mode to all existing channels.
-  remote_ice_mode_ = remote_description_->ice_mode;
-
-  // Now that we have negotiated everything, push it downward.
-  // Note that we cache the result so that if we have race conditions
-  // between future SetRemote/SetLocal invocations and new channel
-  // creation, we have the negotiation state saved until a new
-  // negotiation happens.
-  for (const auto& kv : channels_) {
-    if (!ApplyNegotiatedTransportDescription(kv.second, error_desc)) {
-      return false;
-    }
-  }
-  return true;
-}
-
-bool Transport::VerifyCertificateFingerprint(
-    const rtc::RTCCertificate* certificate,
-    const rtc::SSLFingerprint* fingerprint,
-    std::string* error_desc) const {
-  if (!fingerprint) {
-    return BadTransportDescription("No fingerprint.", error_desc);
-  }
-  if (!certificate) {
-    return BadTransportDescription(
-        "Fingerprint provided but no identity available.", error_desc);
-  }
-  std::unique_ptr<rtc::SSLFingerprint> fp_tmp(rtc::SSLFingerprint::Create(
-      fingerprint->algorithm, certificate->identity()));
-  ASSERT(fp_tmp.get() != NULL);
-  if (*fp_tmp == *fingerprint) {
-    return true;
-  }
-  std::ostringstream desc;
-  desc << "Local fingerprint does not match identity. Expected: ";
-  desc << fp_tmp->ToString();
-  desc << " Got: " << fingerprint->ToString();
-  return BadTransportDescription(desc.str(), error_desc);
-}
-
-bool Transport::NegotiateRole(ContentAction local_role,
-                              rtc::SSLRole* ssl_role,
-                              std::string* error_desc) const {
-  RTC_DCHECK(ssl_role);
-  if (!local_description() || !remote_description()) {
-    const std::string msg =
-        "Local and Remote description must be set before "
-        "transport descriptions are negotiated";
-    return BadTransportDescription(msg, error_desc);
-  }
-
-  // From RFC 4145, section-4.1, The following are the values that the
-  // 'setup' attribute can take in an offer/answer exchange:
-  //       Offer      Answer
-  //      ________________
-  //      active     passive / holdconn
-  //      passive    active / holdconn
-  //      actpass    active / passive / holdconn
-  //      holdconn   holdconn
-  //
-  // Set the role that is most conformant with RFC 5763, Section 5, bullet 1
-  // The endpoint MUST use the setup attribute defined in [RFC4145].
-  // The endpoint that is the offerer MUST use the setup attribute
-  // value of setup:actpass and be prepared to receive a client_hello
-  // before it receives the answer.  The answerer MUST use either a
-  // setup attribute value of setup:active or setup:passive.  Note that
-  // if the answerer uses setup:passive, then the DTLS handshake will
-  // not begin until the answerer is received, which adds additional
-  // latency. setup:active allows the answer and the DTLS handshake to
-  // occur in parallel.  Thus, setup:active is RECOMMENDED.  Whichever
-  // party is active MUST initiate a DTLS handshake by sending a
-  // ClientHello over each flow (host/port quartet).
-  // IOW - actpass and passive modes should be treated as server and
-  // active as client.
-  ConnectionRole local_connection_role = local_description()->connection_role;
-  ConnectionRole remote_connection_role = remote_description()->connection_role;
-
-  bool is_remote_server = false;
-  if (local_role == CA_OFFER) {
-    if (local_connection_role != CONNECTIONROLE_ACTPASS) {
-      return BadTransportDescription(
-          "Offerer must use actpass value for setup attribute.", error_desc);
-    }
-
-    if (remote_connection_role == CONNECTIONROLE_ACTIVE ||
-        remote_connection_role == CONNECTIONROLE_PASSIVE ||
-        remote_connection_role == CONNECTIONROLE_NONE) {
-      is_remote_server = (remote_connection_role == CONNECTIONROLE_PASSIVE);
-    } else {
-      const std::string msg =
-          "Answerer must use either active or passive value "
-          "for setup attribute.";
-      return BadTransportDescription(msg, error_desc);
-    }
-    // If remote is NONE or ACTIVE it will act as client.
-  } else {
-    if (remote_connection_role != CONNECTIONROLE_ACTPASS &&
-        remote_connection_role != CONNECTIONROLE_NONE) {
-      return BadTransportDescription(
-          "Offerer must use actpass value for setup attribute.", error_desc);
-    }
-
-    if (local_connection_role == CONNECTIONROLE_ACTIVE ||
-        local_connection_role == CONNECTIONROLE_PASSIVE) {
-      is_remote_server = (local_connection_role == CONNECTIONROLE_ACTIVE);
-    } else {
-      const std::string msg =
-          "Answerer must use either active or passive value "
-          "for setup attribute.";
-      return BadTransportDescription(msg, error_desc);
-    }
-
-    // If local is passive, local will act as server.
-  }
-
-  *ssl_role = is_remote_server ? rtc::SSL_CLIENT : rtc::SSL_SERVER;
-  return true;
-}
-
-}  // namespace cricket