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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.
*/
#pragma once
#include "dnsparser.hh"
namespace dnsdist
{
class DNSPacketOverlay
{
public:
DNSPacketOverlay(const std::string_view& packet);
struct Record
{
DNSName d_name;
uint32_t d_ttl;
uint16_t d_type;
uint16_t d_class;
uint16_t d_contentLength;
uint16_t d_contentOffset;
DNSResourceRecord::Place d_place;
};
DNSName d_qname;
std::vector<Record> d_records;
uint16_t d_qtype;
uint16_t d_qclass;
dnsheader d_header;
};
/* Rewrite, if they are exactly equal to 'from', the qname and owner name of any record
* to 'to'. Since that might break DNS name pointers, the whole payload is rewritten,
* and the operation may fail if there is at least one unsupported record in the payload,
* because it could contain pointers that would not be rewritten.
*/
bool changeNameInDNSPacket(PacketBuffer& initialPacket, const DNSName& from, const DNSName& to);
namespace PacketMangling
{
bool editDNSHeaderFromPacket(PacketBuffer& packet, const std::function<bool(dnsheader& header)>& editFunction);
bool editDNSHeaderFromRawPacket(void* packet, const std::function<bool(dnsheader& header)>& editFunction);
}
}
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