Host offline status reporting.

remoting/host/host_status_sender.cc

+// Copyright 2013 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 "remoting/host/host_status_sender.h"
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringize_macros.h"
+#include "base/time/time.h"
+#include "remoting/base/constants.h"
+#include "remoting/host/server_log_entry.h"
+#include "remoting/jingle_glue/iq_sender.h"
+#include "remoting/jingle_glue/signal_strategy.h"
+#include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
+#include "third_party/libjingle/source/talk/xmpp/constants.h"
+
+using buzz::QName;
+using buzz::XmlElement;
+
+namespace remoting {
+
+namespace {
+
+const char kHostStatusTag[] = "host-status";
+const char kHostIdAttr[] = "hostid";
+const char kExitCodeAttr[] = "exit-code";
+const char kHostVersionTag[] = "host-version";
+const char kSignatureTag[] = "signature";
+const char kStatusAttr[] = "status";
+const char kSignatureTimeAttr[] = "time";
+
+}  // namespace
+
+const char* const HostStatusSender::host_status_strings_[] =
+{"OFFLINE", "ONLINE"};
+
+HostStatusSender::HostStatusSender(
+    const std::string& host_id,
+    SignalStrategy* signal_strategy,
+    scoped_refptr<RsaKeyPair> key_pair,
+    const std::string& directory_bot_jid)
+    : host_id_(host_id),
+      signal_strategy_(signal_strategy),
+      key_pair_(key_pair),
+      directory_bot_jid_(directory_bot_jid) {
+  DCHECK(signal_strategy_);
+  DCHECK(key_pair_.get());
+
+  signal_strategy_->AddListener(this);
+}
+
+HostStatusSender::~HostStatusSender() {
+  signal_strategy_->RemoveListener(this);
+}
+
+void HostStatusSender::OnSignalStrategyStateChange(
+    SignalStrategy::State state) {
+  if (state == SignalStrategy::CONNECTED)
+    iq_sender_.reset(new IqSender(signal_strategy_));
+  else if (state == SignalStrategy::DISCONNECTED)
+    iq_sender_.reset();
+}
+
+bool HostStatusSender::OnSignalStrategyIncomingStanza(
+    const XmlElement* stanza) {
+  return false;
+}
+
+void HostStatusSender::SendOfflineStatus(HostExitCodes exit_code) {
+  SendHostStatus(OFFLINE, exit_code);
+}
+
+void HostStatusSender::SendOnlineStatus() {
+  SendHostStatus(ONLINE, kSuccessExitCode);
+}
+
+void HostStatusSender::SendHostStatus(HostStatus status,
+                                      HostExitCodes exit_code) {
+  SignalStrategy::State state = signal_strategy_->GetState();
+  if (state == SignalStrategy::CONNECTED) {
+    LOG(INFO) << "Sending host status '"
+              << HostStatusToString(status)
+              << "' to "
+              << directory_bot_jid_;
+
+    iq_sender_->SendIq(buzz::STR_SET,
+                       directory_bot_jid_,
+                       CreateHostStatusMessage(status, exit_code),
+                       IqSender::ReplyCallback());
+  } else {
+    LOG(INFO) << "Cannot send host status to '"
+              << directory_bot_jid_
+              << " ' because the state of the SignalStrategy is "
+              << state;
+  }
+}
+
+scoped_ptr<XmlElement> HostStatusSender::CreateHostStatusMessage(
+    HostStatus status, HostExitCodes exit_code) {
+  // Create host status stanza.
+  scoped_ptr<XmlElement> host_status(new XmlElement(
+      QName(kChromotingXmlNamespace, kHostStatusTag)));
+  host_status->AddAttr(
+      QName(kChromotingXmlNamespace, kHostIdAttr), host_id_);
+  host_status->AddAttr(
+      QName(kChromotingXmlNamespace, kStatusAttr), HostStatusToString(status));
+
+  if (status == OFFLINE) {
+    host_status->AddAttr(
+        QName(kChromotingXmlNamespace, kExitCodeAttr),
+        ExitCodeToString(exit_code));
+  }
+
+  host_status->AddElement(CreateSignature(status, exit_code).release());
+
+  // Append host version.
+  scoped_ptr<XmlElement> version_tag(new XmlElement(
+      QName(kChromotingXmlNamespace, kHostVersionTag)));
+  version_tag->AddText(STRINGIZE(VERSION));
+  host_status->AddElement(version_tag.release());
+
+  // Append log message (which isn't signed).
+  scoped_ptr<XmlElement> log(ServerLogEntry::MakeStanza());
+  scoped_ptr<ServerLogEntry> log_entry(
+      ServerLogEntry::MakeForHostStatus(status, exit_code));
+  log_entry->AddHostFields();
+  log->AddElement(log_entry->ToStanza().release());
+  host_status->AddElement(log.release());
+  return host_status.Pass();
+}
+
+scoped_ptr<XmlElement> HostStatusSender::CreateSignature(
+    HostStatus status, HostExitCodes exit_code) {
+  scoped_ptr<XmlElement> signature_tag(new XmlElement(
+      QName(kChromotingXmlNamespace, kSignatureTag)));
+
+  // Number of seconds since epoch (Jan 1, 1970).
+  int64 time = static_cast<int64>(base::Time::Now().ToDoubleT());
+  std::string time_str(base::Int64ToString(time));
+
+  signature_tag->AddAttr(
+      QName(kChromotingXmlNamespace, kSignatureTimeAttr), time_str);
+
+  // Add a time stamp to the signature to prevent replay attacks.
+  std::string message =
+      signal_strategy_->GetLocalJid() +
+      " " +
+      time_str +
+      " " +
+      HostStatusToString(status);
+
+  if (status == OFFLINE)
+    message += std::string(" ") + ExitCodeToString(exit_code);
+
+  std::string signature(key_pair_->SignMessage(message));
+  signature_tag->AddText(signature);
+
+  return signature_tag.Pass();
+}
+
+}  // namespace remoting