/*
* 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.
*/
#ifndef PDNS_EDNSOPTIONS_HH
#define PDNS_EDNSOPTIONS_HH
#include "namespaces.hh"
struct EDNSOptionCode
{
enum EDNSOptionCodeEnum {NSID=3, DAU=5, DHU=6, N3U=7, ECS=8, EXPIRE=9, COOKIE=10, TCPKEEPALIVE=11, PADDING=12, CHAIN=13, KEYTAG=14};
};
/* extract a specific EDNS0 option from a pointer on the beginning rdLen of the OPT RR */
int getEDNSOption(char* optRR, size_t len, uint16_t wantedOption, char ** optionValue, size_t * optionValueSize);
struct EDNSOptionViewValue
{
const char* content{nullptr};
uint16_t size{0};
};
struct EDNSOptionView
{
std::vector<EDNSOptionViewValue> values;
};
typedef std::map<uint16_t, EDNSOptionView> EDNSOptionViewMap;
/* extract all EDNS0 options from a pointer on the beginning rdLen of the OPT RR */
int getEDNSOptions(const char* optRR, size_t len, EDNSOptionViewMap& options);
void generateEDNSOption(uint16_t optionCode, const std::string& payload, std::string& res);
#endif