//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/update_manager/default_policy.h"
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using chromeos_update_engine::ErrorCode;
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using chromeos_update_engine::InstallPlan;
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namespace {
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// A fixed minimum interval between consecutive allowed update checks. This
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// needs to be long enough to prevent busywork and/or DDoS attacks on Omaha, but
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// at the same time short enough to allow the machine to update itself
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// reasonably soon.
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const int kCheckIntervalInSeconds = 15 * 60;
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} // namespace
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namespace chromeos_update_manager {
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DefaultPolicy::DefaultPolicy(chromeos_update_engine::ClockInterface* clock)
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: clock_(clock), aux_state_(new DefaultPolicyState()) {}
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EvalStatus DefaultPolicy::UpdateCheckAllowed(EvaluationContext* ec,
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State* state,
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std::string* error,
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UpdateCheckParams* result) const {
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result->updates_enabled = true;
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result->target_channel.clear();
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result->target_version_prefix.clear();
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result->rollback_allowed = false;
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result->rollback_allowed_milestones = -1; // No version rolls should happen.
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result->interactive = false;
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// Ensure that the minimum interval is set. If there's no clock, this defaults
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// to always allowing the update.
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if (!aux_state_->IsLastCheckAllowedTimeSet() ||
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ec->IsMonotonicTimeGreaterThan(
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aux_state_->last_check_allowed_time() +
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base::TimeDelta::FromSeconds(kCheckIntervalInSeconds))) {
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if (clock_)
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aux_state_->set_last_check_allowed_time(clock_->GetMonotonicTime());
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return EvalStatus::kSucceeded;
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}
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return EvalStatus::kAskMeAgainLater;
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}
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EvalStatus DefaultPolicy::UpdateCanBeApplied(EvaluationContext* ec,
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State* state,
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std::string* error,
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ErrorCode* result,
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InstallPlan* install_plan) const {
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*result = ErrorCode::kSuccess;
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return EvalStatus::kSucceeded;
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}
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EvalStatus DefaultPolicy::UpdateCanStart(EvaluationContext* ec,
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State* state,
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std::string* error,
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UpdateDownloadParams* result,
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const UpdateState update_state) const {
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result->update_can_start = true;
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result->cannot_start_reason = UpdateCannotStartReason::kUndefined;
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result->download_url_idx = 0;
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result->download_url_allowed = true;
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result->download_url_num_errors = 0;
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result->p2p_downloading_allowed = false;
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result->p2p_sharing_allowed = false;
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result->do_increment_failures = false;
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result->backoff_expiry = base::Time();
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result->scatter_wait_period = base::TimeDelta();
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result->scatter_check_threshold = 0;
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return EvalStatus::kSucceeded;
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}
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EvalStatus DefaultPolicy::UpdateDownloadAllowed(EvaluationContext* ec,
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State* state,
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std::string* error,
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bool* result) const {
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*result = true;
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return EvalStatus::kSucceeded;
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}
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EvalStatus DefaultPolicy::P2PEnabled(EvaluationContext* ec,
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State* state,
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std::string* error,
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bool* result) const {
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*result = false;
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return EvalStatus::kSucceeded;
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}
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EvalStatus DefaultPolicy::P2PEnabledChanged(EvaluationContext* ec,
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State* state,
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std::string* error,
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bool* result,
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bool prev_result) const {
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// This policy will always prohibit P2P, so this is signaling to the caller
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// that the decision is final (because the current value is the same as the
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// previous one) and there's no need to issue another call.
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*result = false;
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return EvalStatus::kSucceeded;
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}
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} // namespace chromeos_update_manager
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