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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 "dnsdist-dynbpf.hh"
bool DynBPFFilter::block(const ComboAddress& addr, const struct timespec& until)
{
bool inserted = false;
auto data = d_data.lock();
if (data->d_excludedSubnets.match(addr)) {
/* do not add a block for excluded subnets */
return inserted;
}
const container_t::iterator it = data->d_entries.find(addr);
if (it != data->d_entries.end()) {
if (it->d_until < until) {
data->d_entries.replace(it, BlockEntry(addr, until));
}
}
else {
data->d_bpf->block(addr, BPFFilter::MatchAction::Drop);
data->d_entries.insert(BlockEntry(addr, until));
inserted = true;
}
return inserted;
}
void DynBPFFilter::purgeExpired(const struct timespec& now)
{
auto data = d_data.lock();
typedef boost::multi_index::nth_index<container_t,1>::type ordered_until;
ordered_until& ou = boost::multi_index::get<1>(data->d_entries);
for (ordered_until::iterator it = ou.begin(); it != ou.end(); ) {
if (it->d_until < now) {
ComboAddress addr = it->d_addr;
it = ou.erase(it);
data->d_bpf->unblock(addr);
}
else {
break;
}
}
}
std::vector<std::tuple<ComboAddress, uint64_t, struct timespec> > DynBPFFilter::getAddrStats()
{
std::vector<std::tuple<ComboAddress, uint64_t, struct timespec> > result;
auto data = d_data.lock();
if (!data->d_bpf) {
return result;
}
const auto& stats = data->d_bpf->getAddrStats();
result.reserve(stats.size());
for (const auto& stat : stats) {
const container_t::iterator it = data->d_entries.find(stat.first);
if (it != data->d_entries.end()) {
result.emplace_back(stat.first, stat.second, it->d_until);
}
}
return result;
}
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