/*
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* Copyright (C) 2018 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 "DnsTlsSessionCache.h"
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#define LOG_TAG "DnsTlsSessionCache"
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//#define LOG_NDEBUG 0
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#include "log/log.h"
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namespace android {
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namespace net {
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bool DnsTlsSessionCache::prepareSsl(SSL* ssl) {
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// Add this cache as the 0-index extra data for the socket.
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// This is used by newSessionCallback.
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int ret = SSL_set_ex_data(ssl, 0, this);
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return ret == 1;
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}
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void DnsTlsSessionCache::prepareSslContext(SSL_CTX* ssl_ctx) {
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SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_CLIENT);
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SSL_CTX_sess_set_new_cb(ssl_ctx, &DnsTlsSessionCache::newSessionCallback);
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}
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// static
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int DnsTlsSessionCache::newSessionCallback(SSL* ssl, SSL_SESSION* session) {
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if (!ssl || !session) {
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ALOGE("Null SSL object in new session callback");
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return 0;
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}
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DnsTlsSessionCache* cache = reinterpret_cast<DnsTlsSessionCache*>(
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SSL_get_ex_data(ssl, 0));
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if (!cache) {
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ALOGE("null transport in new session callback");
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return 0;
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}
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ALOGV("Recording session");
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cache->recordSession(session);
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return 1; // Increment the refcount of session.
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}
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void DnsTlsSessionCache::recordSession(SSL_SESSION* session) {
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std::lock_guard guard(mLock);
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mSessions.emplace_front(session);
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if (mSessions.size() > kMaxSize) {
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ALOGV("Too many sessions; trimming");
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mSessions.pop_back();
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}
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}
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bssl::UniquePtr<SSL_SESSION> DnsTlsSessionCache::getSession() {
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std::lock_guard guard(mLock);
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if (mSessions.size() == 0) {
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ALOGV("No known sessions");
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return nullptr;
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}
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bssl::UniquePtr<SSL_SESSION> ret = std::move(mSessions.front());
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mSessions.pop_front();
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return ret;
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}
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} // end of namespace net
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} // end of namespace android
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