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107 lines
3.4 KiB
107 lines
3.4 KiB
// |
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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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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( |
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EvaluationContext* ec, State* state, 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->is_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::UpdateCanStart( |
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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( |
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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( |
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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( |
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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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