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randomize server addresses to use

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This commit is contained in:
bert hubert 2018-10-16 00:18:00 +02:00
parent dc8187b9e6
commit 642a5a3522
1 changed files with 13 additions and 4 deletions
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17
tdns/tres.cc
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@ -3,8 +3,8 @@
#include <map>
#include <stdexcept>
#include "sclasses.hh"
#include <thread>
#include <signal.h>
#include <random>
#include "record-types.hh"
/*!
@ -141,16 +141,25 @@ struct NodataException{};
root-servers.
*/
vector<std::unique_ptr<RRGen>> resolveAt(const DNSName& dn, const DNSType& dt, int depth=0, const DNSName& auth={}, const multimap<DNSName, ComboAddress>& servers=g_root)
vector<std::unique_ptr<RRGen>> resolveAt(const DNSName& dn, const DNSType& dt, int depth=0, const DNSName& auth={}, const multimap<DNSName, ComboAddress>& mservers=g_root)
{
std::string prefix(depth, ' ');
prefix += dn.toString() + "|"+toString(dt)+" ";
vector<std::unique_ptr<RRGen>> ret;
// it is good form to sort the servers in order of response time
// for tres, this is not done, but it would be good to randomize this a bit
// for tres, this is not done, but we do randomize
cout << prefix << "Starting query at authority = "<<auth<< ", have "<<mservers.size() << " addresses to try"<<endl;
vector<pair<DNSName, ComboAddress> > servers;
for(auto& sp : mservers)
servers.push_back(sp);
std::random_device rd;
std::mt19937 g(rd());
std::shuffle(servers.begin(), servers.end(), g);
cout << prefix << "Starting query at authority = "<<auth<< ", have "<<servers.size() << " addresses to try"<<endl;
for(auto& sp : servers) {
ret.clear();
ComboAddress server=sp.second;