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/*
Copyright (C) 2019-2024 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
signalbackup-tools is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#include "signalbackup.ih"
bool SignalBackup::writeEncryptedFrameWithoutAttachment(std::ofstream &outputfile, std::pair<std::shared_ptr<unsigned char[]>, uint64_t> framedata)
{
// write frame (the non-attachmentdata part)
std::pair<unsigned char *, uint64_t> encryptedframe = d_fe.encryptFrame(framedata);
if (!encryptedframe.first)
{
Logger::error("Failed to encrypt framedata");
return false;
}
bool writeok = !(outputfile.write(reinterpret_cast<char *>(encryptedframe.first), encryptedframe.second)).fail();
delete[] encryptedframe.first;
if (!writeok)
Logger::error("Failed to write encrypted frame data to file");
return writeok;
}
bool SignalBackup::writeEncryptedFrame(std::ofstream &outputfile, BackupFrame *frame)
{
std::pair<std::shared_ptr<unsigned char[]>, uint64_t> framedata(nullptr, 0);
{
std::pair<unsigned char *, uint64_t> framedataraw = frame->getData();
framedata.first.reset(framedataraw.first);
framedata.second = framedataraw.second;
}
if (!framedata.first) [[unlikely]]
{
Logger::error("Failed to get framedata from frame");
return false;
}
uint32_t attachmentsize = 0;
if ((attachmentsize = frame->attachmentSize()) > 0)
{
FrameWithAttachment *f = reinterpret_cast<FrameWithAttachment *>(frame);
bool badmac = false;
unsigned char *attachmentdata = f->attachmentData(&badmac);
if (!attachmentdata)
{
if (badmac)
{
Logger::warning("Corrupted data encountered. Skipping frame.");
return true;
}
return false;
}
if (!writeEncryptedFrameWithoutAttachment(outputfile, framedata)) [[unlikely]]
{
Logger::error("Failed to write encrypt and write BackupFrame. Info:");
frame->printInfo();
return false;
}
// we are done with framedata now... lets destroy it already...
framedata.first.reset();
// write attachment data
std::pair<unsigned char *, uint64_t> newdata = d_fe.encryptAttachment(attachmentdata, attachmentsize);
//std::cout << "Writing attachment data..." << std::endl;
outputfile.write(reinterpret_cast<char *>(newdata.first), newdata.second);
delete[] newdata.first;
if (!outputfile.good()) [[unlikely]]
{
Logger::error("Failed to write encrypted attachmentdata to file");
return false;
}
}
else // not an attachmentframe, write it
if (!writeEncryptedFrameWithoutAttachment(outputfile, framedata)) [[unlikely]]
{
Logger::error("Failed to write encrypt and write BackupFrame. Info:");
frame->printInfo();
return false;
}
return true;
}
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