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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 "namespaces.hh"
#include "iputils.hh"
struct EDNSCookiesOpt
{
static const size_t EDNSCookieSecretSize = 32;
static const size_t EDNSCookieOptSize = 24;
EDNSCookiesOpt() = default;
EDNSCookiesOpt(const std::string& option);
EDNSCookiesOpt(const char* option, unsigned int len);
bool makeFromString(const std::string& option);
bool makeFromString(const char* option, unsigned int len);
size_t size() const
{
return server.size() + client.size();
}
bool isWellFormed() const
{
// RFC7873 section 5.2.2
// In summary, valid cookie lengths are 8 and 16 to 40 inclusive.
return (
client.size() == 8 && (server.size() == 0 || (server.size() >= 8 && server.size() <= 32)));
}
bool isValid(const string& secret, const ComboAddress& source) const;
bool makeServerCookie(const string& secret, const ComboAddress& source);
string makeOptString() const;
string getServer() const
{
return server;
}
string getClient() const
{
return client;
}
private:
bool shouldRefresh() const;
// the client cookie
string client;
// the server cookie
string server;
void getEDNSCookiesOptFromString(const char* option, unsigned int len);
};
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