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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <limits>
#include "ednsextendederror.hh"
static bool getEDNSExtendedErrorOptFromStringView(const pdns_string_view& option, EDNSExtendedError& eee)
{
if (option.size() < sizeof(uint16_t)) {
return false;
}
eee.infoCode = static_cast<uint8_t>(option.at(0)) * 256 + static_cast<uint8_t>(option.at(1));
if (option.size() > sizeof(uint16_t)) {
eee.extraText = std::string(&option.at(sizeof(uint16_t)), option.size() - sizeof(uint16_t));
}
return true;
}
bool getEDNSExtendedErrorOptFromString(const string& option, EDNSExtendedError& eee)
{
return getEDNSExtendedErrorOptFromStringView(pdns_string_view(option), eee);
}
bool getEDNSExtendedErrorOptFromString(const char* option, unsigned int len, EDNSExtendedError& eee)
{
return getEDNSExtendedErrorOptFromStringView(pdns_string_view(option, len), eee);
}
string makeEDNSExtendedErrorOptString(const EDNSExtendedError& eee)
{
if (eee.extraText.size() > static_cast<size_t>(std::numeric_limits<uint16_t>::max() - 2)) {
throw std::runtime_error("Trying to create an EDNS Extended Error option with an extra text of size " + std::to_string(eee.extraText.size()));
}
string ret;
ret.reserve(sizeof(uint16_t) + eee.extraText.size());
ret.resize(sizeof(uint16_t));
ret[0] = static_cast<char>(static_cast<uint16_t>(eee.infoCode) / 256);
ret[1] = static_cast<char>(static_cast<uint16_t>(eee.infoCode) % 256);
ret.append(eee.extraText);
return ret;
}
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