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// This file is a part of the IncludeOS unikernel - www.includeos.org
//
// Copyright 2017 IncludeOS AS, Oslo, Norway
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* Master thesis
* by Alf-Andre Walla 2016-2017
*
**/
#include "liveupdate.hpp"
#include <os>
extern uintptr_t heap_end;
namespace liu
{
static const char* rollback_data;
static size_t rollback_len;
void LiveUpdate::rollback_now(const char* reason)
{
if (LiveUpdate::has_rollback_blob())
{
printf("\nPerforming rollback from %p:%u... Reason: %s\n",
rollback_data, (uint32_t) rollback_len, reason);
try
{
buffer_t vec(rollback_data, rollback_data + rollback_len);
// run live update process
LiveUpdate::exec(vec);
}
catch (std::exception& err)
{
fprintf(stderr, "Rollback failed:\n%s\n", err.what());
}
}
else {
fprintf(stderr, "\nMissing rollback data, rebooting...\n");
}
fflush(stderr);
// no matter what, reboot
OS::reboot();
__builtin_unreachable();
}
const std::pair<const char*, size_t> get_rollback_location()
{
return {rollback_data, rollback_len};
}
void LiveUpdate::set_rollback_blob(const void* buffer, size_t len) noexcept
{
rollback_data = (const char*) buffer;
rollback_len = len;
OS::on_panic(LiveUpdate::rollback_now);
}
bool LiveUpdate::has_rollback_blob() noexcept
{
// minimum legit ELF size
return rollback_data != nullptr && rollback_len > 164;
}
}
void softreset_service_handler(const void* opaque, size_t length)
{
// make deep copy?
auto* data = new char[length];
memcpy(data, opaque, length);
liu::rollback_data = data;
liu::rollback_len = length;
OS::on_panic(liu::LiveUpdate::rollback_now);
}