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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 <fstream>
#include "dnsdist-rings.hh"
void Rings::setCapacity(size_t newCapacity, size_t numberOfShards)
{
if (d_initialized) {
throw std::runtime_error("Rings::setCapacity() should not be called once the rings have been initialized");
}
d_capacity = newCapacity;
d_numberOfShards = numberOfShards;
}
void Rings::init()
{
if (d_initialized.exchange(true)) {
throw std::runtime_error("Rings::init() should only be called once");
}
if (d_numberOfShards <= 1) {
d_nbLockTries = 0;
}
d_shards.resize(d_numberOfShards);
/* resize all the rings */
for (auto& shard : d_shards) {
shard = std::make_unique<Shard>();
if (shouldRecordQueries()) {
shard->queryRing.lock()->set_capacity(d_capacity / d_numberOfShards);
}
if (shouldRecordResponses()) {
shard->respRing.lock()->set_capacity(d_capacity / d_numberOfShards);
}
}
/* we just recreated the shards so they are now empty */
d_nbQueryEntries = 0;
d_nbResponseEntries = 0;
}
void Rings::setNumberOfLockRetries(size_t retries)
{
if (d_numberOfShards <= 1) {
d_nbLockTries = 0;
} else {
d_nbLockTries = retries;
}
}
void Rings::setRecordQueries(bool record)
{
d_recordQueries = record;
}
void Rings::setRecordResponses(bool record)
{
d_recordResponses = record;
}
size_t Rings::numDistinctRequestors()
{
std::set<ComboAddress, ComboAddress::addressOnlyLessThan> s;
for (const auto& shard : d_shards) {
auto rl = shard->queryRing.lock();
for (const auto& q : *rl) {
s.insert(q.requestor);
}
}
return s.size();
}
std::unordered_map<int, vector<boost::variant<string,double>>> Rings::getTopBandwidth(unsigned int numentries)
{
map<ComboAddress, unsigned int, ComboAddress::addressOnlyLessThan> counts;
uint64_t total=0;
for (const auto& shard : d_shards) {
{
auto rl = shard->queryRing.lock();
for(const auto& q : *rl) {
counts[q.requestor] += q.size;
total+=q.size;
}
}
{
auto rl = shard->respRing.lock();
for(const auto& r : *rl) {
counts[r.requestor] += r.size;
total+=r.size;
}
}
}
typedef vector<pair<unsigned int, ComboAddress>> ret_t;
ret_t rcounts;
rcounts.reserve(counts.size());
for(const auto& p : counts)
rcounts.push_back({p.second, p.first});
numentries = rcounts.size() < numentries ? rcounts.size() : numentries;
partial_sort(rcounts.begin(), rcounts.begin()+numentries, rcounts.end(), [](const ret_t::value_type&a, const ret_t::value_type&b)
{
return(b.first < a.first);
});
std::unordered_map<int, vector<boost::variant<string,double>>> ret;
uint64_t rest = 0;
int count = 1;
for(const auto& rc : rcounts) {
if (count == static_cast<int>(numentries + 1)) {
rest+=rc.first;
}
else {
ret.insert({count++, {rc.second.toString(), rc.first, 100.0*rc.first/total}});
}
}
if (total > 0) {
ret.insert({count, {"Rest", rest, 100.0*rest/total}});
}
else {
ret.insert({count, {"Rest", rest, 100.0 }});
}
return ret;
}
size_t Rings::loadFromFile(const std::string& filepath, const struct timespec& now)
{
ifstream ifs(filepath);
if (!ifs) {
throw std::runtime_error("unable to open the file at " + filepath);
}
size_t inserted = 0;
string line;
dnsheader dh;
memset(&dh, 0, sizeof(dh));
while (std::getline(ifs, line)) {
boost::trim_right_if(line, boost::is_any_of(" \r\n\x1a"));
boost::trim_left(line);
bool isResponse = false;
vector<string> parts;
stringtok(parts, line, " \t,");
if (parts.size() == 8) {
}
else if (parts.size() >= 11 && parts.size() <= 13) {
isResponse = true;
}
else {
cerr<<"skipping line with "<<parts.size()<<"parts: "<<line<<endl;
continue;
}
size_t idx = 0;
vector<string> timeStr;
stringtok(timeStr, parts.at(idx++), ".");
if (timeStr.size() != 2) {
cerr<<"skipping invalid time "<<parts.at(0)<<endl;
continue;
}
struct timespec when;
try {
when.tv_sec = now.tv_sec + std::stoi(timeStr.at(0));
when.tv_nsec = now.tv_nsec + std::stoi(timeStr.at(1)) * 100 * 1000 * 1000;
}
catch (const std::exception& e) {
cerr<<"error parsing time "<<parts.at(idx-1)<<" from line "<<line<<endl;
continue;
}
ComboAddress from(parts.at(idx++));
ComboAddress to;
dnsdist::Protocol protocol(parts.at(idx++));
if (isResponse) {
to = ComboAddress(parts.at(idx++));
}
/* skip ID */
idx++;
DNSName qname(parts.at(idx++));
QType qtype(QType::chartocode(parts.at(idx++).c_str()));
if (isResponse) {
insertResponse(when, from, qname, qtype.getCode(), 0, 0, dh, to, protocol);
}
else {
insertQuery(when, from, qname, qtype.getCode(), 0, dh, protocol);
}
++inserted;
}
return inserted;
}
bool Rings::Response::isACacheHit() const
{
bool hit = ds.sin4.sin_family == 0;
if (!hit && ds.isIPv4() && ds.sin4.sin_addr.s_addr == 0 && ds.sin4.sin_port == 0) {
hit = true;
}
return hit;
}
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