void CryptoManager::changeCryptState(thread_db* tdbb, const Firebird::string& plugName)
{
if (plugName.length() > 31)
{
(Arg::Gds(isc_cp_name_too_long) << Arg::Num(31)).raise();
}
bool newCryptState = plugName.hasData();
{ // window scope
Header hdr(tdbb, LCK_write);
// Check header page for flags
if (hdr->hdr_flags & Ods::hdr_crypt_process)
{
(Arg::Gds(isc_cp_process_active)).raise();
}
bool headerCryptState = hdr->hdr_flags & Ods::hdr_encrypted;
if (headerCryptState == newCryptState)
{
(Arg::Gds(isc_cp_already_crypted)).raise();
}
fb_assert(stateLock);
// Take exclusive stateLock
bool ret = needLock ? LCK_lock(tdbb, stateLock, LCK_PW, LCK_WAIT) :
LCK_convert(tdbb, stateLock, LCK_PW, LCK_WAIT);
if (!ret)
{
fb_assert(tdbb->tdbb_status_vector[1]);
ERR_punt();
}
fb_utils::init_status(tdbb->tdbb_status_vector);
needLock = false;
// Load plugin
if (newCryptState)
{
loadPlugin(plugName.c_str());
}
crypt = newCryptState;
// Write modified header page
Ods::header_page* header = hdr.write();
if (crypt)
{
header->hdr_flags |= Ods::hdr_encrypted;
plugName.copyTo(header->hdr_crypt_plugin, sizeof header->hdr_crypt_plugin);
}
else
{
header->hdr_flags &= ~Ods::hdr_encrypted;
}
header->hdr_flags |= Ods::hdr_crypt_process;
process = true;
}
// Trigger lock on ChangeCryptState
if (!LCK_convert(tdbb, stateLock, LCK_EX, LCK_WAIT))
{
ERR_punt();
}
if (!LCK_convert(tdbb, stateLock, LCK_SR, LCK_WAIT))
{
ERR_punt();
}
fb_utils::init_status(tdbb->tdbb_status_vector);
// Now we may set hdr_crypt_page for crypt thread
{ // window scope
Header hdr(tdbb, LCK_write);
Ods::header_page* header = hdr.write();
header->hdr_crypt_page = 1;
}
startCryptThread(tdbb);
}
