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dnsdist-lua2.cc
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dnsdist-lua2.cc
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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.hh"
#include "dnsdist-cache.hh"
#include "dnsrulactions.hh"
#include <thread>
#include "dolog.hh"
#include "sodcrypto.hh"
#include "base64.hh"
#include "lock.hh"
#include "gettime.hh"
#include <map>
#include <fstream>
#include <boost/logic/tribool.hpp>
#include "statnode.hh"
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include "dnsdist-lua.hh"
boost::tribool g_noLuaSideEffect;
static bool g_included{false};
/* this is a best effort way to prevent logging calls with no side-effects in the output of delta()
Functions can declare setLuaNoSideEffect() and if nothing else does declare a side effect, or nothing
has done so before on this invocation, this call won't be part of delta() output */
void setLuaNoSideEffect()
{
if(g_noLuaSideEffect==false) // there has been a side effect already
return;
g_noLuaSideEffect=true;
}
void setLuaSideEffect()
{
g_noLuaSideEffect=false;
}
bool getLuaNoSideEffect()
{
return g_noLuaSideEffect==true;
}
void resetLuaSideEffect()
{
g_noLuaSideEffect = boost::logic::indeterminate;
}
map<ComboAddress,int> filterScore(const map<ComboAddress, unsigned int,ComboAddress::addressOnlyLessThan >& counts,
double delta, int rate)
{
std::multimap<unsigned int,ComboAddress> score;
for(const auto& e : counts)
score.insert({e.second, e.first});
map<ComboAddress,int> ret;
double lim = delta*rate;
for(auto s = score.crbegin(); s != score.crend() && s->first > lim; ++s) {
ret[s->second]=s->first;
}
return ret;
}
typedef std::function<void(const StatNode&, const StatNode::Stat&, const StatNode::Stat&)> statvisitor_t;
static void statNodeRespRing(statvisitor_t visitor, unsigned int seconds)
{
struct timespec cutoff, now;
gettime(&now);
if (seconds) {
cutoff = now;
cutoff.tv_sec -= seconds;
}
std::lock_guard<std::mutex> lock(g_rings.respMutex);
StatNode root;
for(const auto& c : g_rings.respRing) {
if (now < c.when)
continue;
if (seconds && c.when < cutoff)
continue;
root.submit(c.name, c.dh.rcode, c.requestor);
}
StatNode::Stat node;
root.visit([&visitor](const StatNode* node_, const StatNode::Stat& self, const StatNode::Stat& children) {
visitor(*node_, self, children);}, node);
}
vector<pair<unsigned int, std::unordered_map<string,string> > > getRespRing(boost::optional<int> rcode)
{
typedef std::unordered_map<string,string> entry_t;
vector<pair<unsigned int, entry_t > > ret;
std::lock_guard<std::mutex> lock(g_rings.respMutex);
entry_t e;
unsigned int count=1;
for(const auto& c : g_rings.respRing) {
if(rcode && (rcode.get() != c.dh.rcode))
continue;
e["qname"]=c.name.toString();
e["rcode"]=std::to_string(c.dh.rcode);
ret.push_back(std::make_pair(count,e));
count++;
}
return ret;
}
typedef map<ComboAddress, unsigned int,ComboAddress::addressOnlyLessThan > counts_t;
map<ComboAddress,int> exceedRespGen(int rate, int seconds, std::function<void(counts_t&, const Rings::Response&)> T)
{
counts_t counts;
struct timespec cutoff, mintime, now;
gettime(&now);
cutoff = mintime = now;
cutoff.tv_sec -= seconds;
std::lock_guard<std::mutex> lock(g_rings.respMutex);
for(const auto& c : g_rings.respRing) {
if(seconds && c.when < cutoff)
continue;
if(now < c.when)
continue;
T(counts, c);
if(c.when < mintime)
mintime = c.when;
}
double delta = seconds ? seconds : DiffTime(now, mintime);
return filterScore(counts, delta, rate);
}
map<ComboAddress,int> exceedQueryGen(int rate, int seconds, std::function<void(counts_t&, const Rings::Query&)> T)
{
counts_t counts;
struct timespec cutoff, mintime, now;
gettime(&now);
cutoff = mintime = now;
cutoff.tv_sec -= seconds;
ReadLock rl(&g_rings.queryLock);
for(const auto& c : g_rings.queryRing) {
if(seconds && c.when < cutoff)
continue;
if(now < c.when)
continue;
T(counts, c);
if(c.when < mintime)
mintime = c.when;
}
double delta = seconds ? seconds : DiffTime(now, mintime);
return filterScore(counts, delta, rate);
}
map<ComboAddress,int> exceedRCode(int rate, int seconds, int rcode)
{
return exceedRespGen(rate, seconds, [rcode](counts_t& counts, const Rings::Response& r)
{
if(r.dh.rcode == rcode)
counts[r.requestor]++;
});
}
map<ComboAddress,int> exceedRespByterate(int rate, int seconds)
{
return exceedRespGen(rate, seconds, [](counts_t& counts, const Rings::Response& r)
{
counts[r.requestor]+=r.size;
});
}
#ifdef HAVE_DNSCRYPT
static bool generateDNSCryptCertificate(const std::string& providerPrivateKeyFile, uint32_t serial, time_t begin, time_t end, DnsCryptCert& certOut, DnsCryptPrivateKey& keyOut)
{
bool success = false;
unsigned char providerPrivateKey[DNSCRYPT_PROVIDER_PRIVATE_KEY_SIZE];
sodium_mlock(providerPrivateKey, sizeof(providerPrivateKey));
sodium_memzero(providerPrivateKey, sizeof(providerPrivateKey));
try {
ifstream providerKStream(providerPrivateKeyFile);
providerKStream.read((char*) providerPrivateKey, sizeof(providerPrivateKey));
if (providerKStream.fail()) {
providerKStream.close();
throw std::runtime_error("Invalid DNSCrypt provider key file " + providerPrivateKeyFile);
}
DnsCryptContext::generateCertificate(serial, begin, end, providerPrivateKey, keyOut, certOut);
success = true;
}
catch(const std::exception& e) {
errlog(e.what());
}
sodium_memzero(providerPrivateKey, sizeof(providerPrivateKey));
sodium_munlock(providerPrivateKey, sizeof(providerPrivateKey));
return success;
}
#endif /* HAVE_DNSCRYPT */
void moreLua(bool client)
{
typedef NetmaskTree<DynBlock> nmts_t;
g_lua.writeFunction("newCA", [](const std::string& name) { return ComboAddress(name); });
g_lua.writeFunction("newNMG", []() { return NetmaskGroup(); });
g_lua.registerFunction<void(NetmaskGroup::*)(const std::string&mask)>("addMask", [](NetmaskGroup&nmg, const std::string& mask)
{
nmg.addMask(mask);
});
g_lua.registerFunction<void(NetmaskGroup::*)(const std::map<ComboAddress,int>& map)>("addMasks", [](NetmaskGroup&nmg, const std::map<ComboAddress,int>& map)
{
for (const auto& entry : map) {
nmg.addMask(Netmask(entry.first));
}
});
g_lua.registerFunction("match", (bool (NetmaskGroup::*)(const ComboAddress&) const)&NetmaskGroup::match);
g_lua.registerFunction("size", &NetmaskGroup::size);
g_lua.registerFunction("clear", &NetmaskGroup::clear);
g_lua.writeFunction("showDynBlocks", []() {
setLuaNoSideEffect();
auto slow = g_dynblockNMG.getCopy();
struct timespec now;
gettime(&now);
boost::format fmt("%-24s %8d %8d %s\n");
g_outputBuffer = (fmt % "What" % "Seconds" % "Blocks" % "Reason").str();
for(const auto& e: slow) {
if(now < e->second.until)
g_outputBuffer+= (fmt % e->first.toString() % (e->second.until.tv_sec - now.tv_sec) % e->second.blocks % e->second.reason).str();
}
auto slow2 = g_dynblockSMT.getCopy();
slow2.visit([&now, &fmt](const SuffixMatchTree<DynBlock>& node) {
if(now <node.d_value.until) {
string dom("empty");
if(!node.d_value.domain.empty())
dom = node.d_value.domain.toString();
g_outputBuffer+= (fmt % dom % (node.d_value.until.tv_sec - now.tv_sec) % node.d_value.blocks % node.d_value.reason).str();
}
});
});
g_lua.writeFunction("clearDynBlocks", []() {
setLuaSideEffect();
nmts_t nmg;
g_dynblockNMG.setState(nmg);
SuffixMatchTree<DynBlock> smt;
g_dynblockSMT.setState(smt);
});
g_lua.writeFunction("addDynBlocks",
[](const map<ComboAddress,int>& m, const std::string& msg, boost::optional<int> seconds, boost::optional<DNSAction::Action> action) {
setLuaSideEffect();
auto slow = g_dynblockNMG.getCopy();
struct timespec until, now;
gettime(&now);
until=now;
int actualSeconds = seconds ? *seconds : 10;
until.tv_sec += actualSeconds;
for(const auto& capair : m) {
unsigned int count = 0;
auto got = slow.lookup(Netmask(capair.first));
bool expired=false;
if(got) {
if(until < got->second.until) // had a longer policy
continue;
if(now < got->second.until) // only inherit count on fresh query we are extending
count=got->second.blocks;
else
expired=true;
}
DynBlock db{msg,until,DNSName(),(action ? *action : DNSAction::Action::None)};
db.blocks=count;
if(!got || expired)
warnlog("Inserting dynamic block for %s for %d seconds: %s", capair.first.toString(), actualSeconds, msg);
slow.insert(Netmask(capair.first)).second=db;
}
g_dynblockNMG.setState(slow);
});
g_lua.writeFunction("addDynBlockSMT",
[](const vector<pair<unsigned int, string> >&names, const std::string& msg, boost::optional<int> seconds, boost::optional<DNSAction::Action> action) {
setLuaSideEffect();
auto slow = g_dynblockSMT.getCopy();
struct timespec until, now;
gettime(&now);
until=now;
int actualSeconds = seconds ? *seconds : 10;
until.tv_sec += actualSeconds;
for(const auto& capair : names) {
unsigned int count = 0;
DNSName domain(capair.second);
auto got = slow.lookup(domain);
bool expired=false;
if(got) {
if(until < got->until) // had a longer policy
continue;
if(now < got->until) // only inherit count on fresh query we are extending
count=got->blocks;
else
expired=true;
}
DynBlock db{msg,until,domain,(action ? *action : DNSAction::Action::None)};
db.blocks=count;
if(!got || expired)
warnlog("Inserting dynamic block for %s for %d seconds: %s", domain, actualSeconds, msg);
slow.add(domain, db);
}
g_dynblockSMT.setState(slow);
});
g_lua.writeFunction("setDynBlocksAction", [](DNSAction::Action action) {
if (!g_configurationDone) {
if (action == DNSAction::Action::Drop || action == DNSAction::Action::Refused || action == DNSAction::Action::Truncate) {
g_dynBlockAction = action;
}
else {
errlog("Dynamic blocks action can only be Drop, Refused or Truncate!");
g_outputBuffer="Dynamic blocks action can only be Drop, Refused or Truncate!\n";
}
} else {
g_outputBuffer="Dynamic blocks action cannot be altered at runtime!\n";
}
});
g_lua.registerFunction<bool(nmts_t::*)(const ComboAddress&)>("match",
[](nmts_t& s, const ComboAddress& ca) { return s.match(ca); });
g_lua.writeFunction("exceedServFails", [](unsigned int rate, int seconds) {
setLuaNoSideEffect();
return exceedRCode(rate, seconds, RCode::ServFail);
});
g_lua.writeFunction("exceedNXDOMAINs", [](unsigned int rate, int seconds) {
setLuaNoSideEffect();
return exceedRCode(rate, seconds, RCode::NXDomain);
});
g_lua.writeFunction("exceedRespByterate", [](unsigned int rate, int seconds) {
setLuaNoSideEffect();
return exceedRespByterate(rate, seconds);
});
g_lua.writeFunction("exceedQTypeRate", [](uint16_t type, unsigned int rate, int seconds) {
setLuaNoSideEffect();
return exceedQueryGen(rate, seconds, [type](counts_t& counts, const Rings::Query& q) {
if(q.qtype==type)
counts[q.requestor]++;
});
});
g_lua.writeFunction("exceedQRate", [](unsigned int rate, int seconds) {
setLuaNoSideEffect();
return exceedQueryGen(rate, seconds, [](counts_t& counts, const Rings::Query& q) {
counts[q.requestor]++;
});
});
g_lua.writeFunction("getRespRing", getRespRing);
g_lua.registerFunction<StatNode, unsigned int()>("numChildren",
[](StatNode& sn) -> unsigned int {
return sn.children.size();
} );
g_lua.registerMember("fullname", &StatNode::fullname);
g_lua.registerMember("labelsCount", &StatNode::labelsCount);
g_lua.registerMember("servfails", &StatNode::Stat::servfails);
g_lua.registerMember("nxdomains", &StatNode::Stat::nxdomains);
g_lua.registerMember("queries", &StatNode::Stat::queries);
g_lua.writeFunction("statNodeRespRing", [](statvisitor_t visitor, boost::optional<unsigned int> seconds) {
statNodeRespRing(visitor, seconds ? *seconds : 0);
});
g_lua.writeFunction("getTopBandwidth", [](unsigned int top) {
setLuaNoSideEffect();
return g_rings.getTopBandwidth(top);
});
g_lua.executeCode(R"(function topBandwidth(top) top = top or 10; for k,v in ipairs(getTopBandwidth(top)) do show(string.format("%4d %-40s %4d %4.1f%%",k,v[1],v[2],v[3])) end end)");
g_lua.writeFunction("delta", []() {
setLuaNoSideEffect();
// we hold the lua lock already!
for(const auto& d : g_confDelta) {
struct tm tm;
localtime_r(&d.first.tv_sec, &tm);
char date[80];
strftime(date, sizeof(date)-1, "-- %a %b %d %Y %H:%M:%S %Z\n", &tm);
g_outputBuffer += date;
g_outputBuffer += d.second + "\n";
}
});
g_lua.writeFunction("grepq", [](boost::variant<string, vector<pair<int,string> > > inp, boost::optional<unsigned int> limit) {
setLuaNoSideEffect();
boost::optional<Netmask> nm;
boost::optional<DNSName> dn;
int msec=-1;
vector<string> vec;
auto str=boost::get<string>(&inp);
if(str)
vec.push_back(*str);
else {
auto v = boost::get<vector<pair<int, string> > >(inp);
for(const auto& a: v)
vec.push_back(a.second);
}
for(const auto& s : vec) {
try
{
nm = Netmask(s);
}
catch(...) {
if(boost::ends_with(s,"ms") && sscanf(s.c_str(), "%ums", &msec)) {
;
}
else {
try { dn=DNSName(s); }
catch(...)
{
g_outputBuffer = "Could not parse '"+s+"' as domain name or netmask";
return;
}
}
}
}
decltype(g_rings.queryRing) qr;
decltype(g_rings.respRing) rr;
{
ReadLock rl(&g_rings.queryLock);
qr=g_rings.queryRing;
}
sort(qr.begin(), qr.end(), [](const decltype(qr)::value_type& a, const decltype(qr)::value_type& b) {
return b.when < a.when;
});
{
std::lock_guard<std::mutex> lock(g_rings.respMutex);
rr=g_rings.respRing;
}
sort(rr.begin(), rr.end(), [](const decltype(rr)::value_type& a, const decltype(rr)::value_type& b) {
return b.when < a.when;
});
unsigned int num=0;
struct timespec now;
gettime(&now);
std::multimap<struct timespec, string> out;
boost::format fmt("%-7.1f %-47s %-12s %-5d %-25s %-5s %-6.1f %-2s %-2s %-2s %s\n");
g_outputBuffer+= (fmt % "Time" % "Client" % "Server" % "ID" % "Name" % "Type" % "Lat." % "TC" % "RD" % "AA" % "Rcode").str();
if(msec==-1) {
for(const auto& c : qr) {
bool nmmatch=true, dnmatch=true;
if(nm)
nmmatch = nm->match(c.requestor);
if(dn)
dnmatch = c.name.isPartOf(*dn);
if(nmmatch && dnmatch) {
QType qt(c.qtype);
out.insert(make_pair(c.when, (fmt % DiffTime(now, c.when) % c.requestor.toStringWithPort() % "" % htons(c.dh.id) % c.name.toString() % qt.getName() % "" % (c.dh.tc ? "TC" : "") % (c.dh.rd? "RD" : "") % (c.dh.aa? "AA" : "") % "Question").str() )) ;
if(limit && *limit==++num)
break;
}
}
}
num=0;
string extra;
for(const auto& c : rr) {
bool nmmatch=true, dnmatch=true, msecmatch=true;
if(nm)
nmmatch = nm->match(c.requestor);
if(dn)
dnmatch = c.name.isPartOf(*dn);
if(msec != -1)
msecmatch=(c.usec/1000 > (unsigned int)msec);
if(nmmatch && dnmatch && msecmatch) {
QType qt(c.qtype);
if(!c.dh.rcode)
extra=". " +std::to_string(htons(c.dh.ancount))+ " answers";
else
extra.clear();
if(c.usec != std::numeric_limits<decltype(c.usec)>::max())
out.insert(make_pair(c.when, (fmt % DiffTime(now, c.when) % c.requestor.toStringWithPort() % c.ds.toStringWithPort() % htons(c.dh.id) % c.name.toString() % qt.getName() % (c.usec/1000.0) % (c.dh.tc ? "TC" : "") % (c.dh.rd? "RD" : "") % (c.dh.aa? "AA" : "") % (RCode::to_s(c.dh.rcode) + extra)).str() )) ;
else
out.insert(make_pair(c.when, (fmt % DiffTime(now, c.when) % c.requestor.toStringWithPort() % c.ds.toStringWithPort() % htons(c.dh.id) % c.name.toString() % qt.getName() % "T.O" % (c.dh.tc ? "TC" : "") % (c.dh.rd? "RD" : "") % (c.dh.aa? "AA" : "") % (RCode::to_s(c.dh.rcode) + extra)).str() )) ;
if(limit && *limit==++num)
break;
}
}
for(const auto& p : out) {
g_outputBuffer+=p.second;
}
});
g_lua.writeFunction("addDNSCryptBind", [](const std::string& addr, const std::string& providerName, const std::string& certFile, const std::string keyFile, boost::optional<localbind_t> vars) {
if (g_configurationDone) {
g_outputBuffer="addDNSCryptBind cannot be used at runtime!\n";
return;
}
#ifdef HAVE_DNSCRYPT
bool doTCP = true;
bool reusePort = false;
int tcpFastOpenQueueSize = 0;
std::string interface;
parseLocalBindVars(vars, doTCP, reusePort, tcpFastOpenQueueSize, interface);
try {
DnsCryptContext ctx(providerName, certFile, keyFile);
g_dnsCryptLocals.push_back(std::make_tuple(ComboAddress(addr, 443), ctx, reusePort, tcpFastOpenQueueSize, interface));
}
catch(std::exception& e) {
errlog(e.what());
g_outputBuffer="Error: "+string(e.what())+"\n";
}
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
g_lua.writeFunction("showDNSCryptBinds", []() {
setLuaNoSideEffect();
#ifdef HAVE_DNSCRYPT
ostringstream ret;
boost::format fmt("%1$-3d %2% %|25t|%3$-20.20s %|26t|%4$-8d %|35t|%5$-21.21s %|56t|%6$-9d %|66t|%7$-21.21s" );
ret << (fmt % "#" % "Address" % "Provider Name" % "Serial" % "Validity" % "P. Serial" % "P. Validity") << endl;
size_t idx = 0;
for (const auto& local : g_dnsCryptLocals) {
const DnsCryptContext& ctx = std::get<1>(local);
bool const hasOldCert = ctx.hasOldCertificate();
const DnsCryptCert& cert = ctx.getCurrentCertificate();
const DnsCryptCert& oldCert = ctx.getOldCertificate();
ret<< (fmt % idx % std::get<0>(local).toStringWithPort() % ctx.getProviderName() % cert.signedData.serial % DnsCryptContext::certificateDateToStr(cert.signedData.tsEnd) % (hasOldCert ? oldCert.signedData.serial : 0) % (hasOldCert ? DnsCryptContext::certificateDateToStr(oldCert.signedData.tsEnd) : "-")) << endl;
idx++;
}
g_outputBuffer=ret.str();
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
g_lua.writeFunction("getDNSCryptBind", [client](size_t idx) {
setLuaNoSideEffect();
#ifdef HAVE_DNSCRYPT
DnsCryptContext* ret = nullptr;
if (idx < g_dnsCryptLocals.size()) {
ret = &(std::get<1>(g_dnsCryptLocals.at(idx)));
}
return ret;
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
#ifdef HAVE_DNSCRYPT
/* DnsCryptContext bindings */
g_lua.registerFunction<std::string(DnsCryptContext::*)()>("getProviderName", [](const DnsCryptContext& ctx) { return ctx.getProviderName(); });
g_lua.registerFunction<DnsCryptCert(DnsCryptContext::*)()>("getCurrentCertificate", [](const DnsCryptContext& ctx) { return ctx.getCurrentCertificate(); });
g_lua.registerFunction<DnsCryptCert(DnsCryptContext::*)()>("getOldCertificate", [](const DnsCryptContext& ctx) { return ctx.getOldCertificate(); });
g_lua.registerFunction("hasOldCertificate", &DnsCryptContext::hasOldCertificate);
g_lua.registerFunction("loadNewCertificate", &DnsCryptContext::loadNewCertificate);
g_lua.registerFunction<void(DnsCryptContext::*)(const std::string& providerPrivateKeyFile, uint32_t serial, time_t begin, time_t end)>("generateAndLoadInMemoryCertificate", [](DnsCryptContext& ctx, const std::string& providerPrivateKeyFile, uint32_t serial, time_t begin, time_t end) {
DnsCryptPrivateKey privateKey;
DnsCryptCert cert;
try {
if (generateDNSCryptCertificate(providerPrivateKeyFile, serial, begin, end, cert, privateKey)) {
ctx.setNewCertificate(cert, privateKey);
}
}
catch(const std::exception& e) {
errlog(e.what());
g_outputBuffer="Error: "+string(e.what())+"\n";
}
});
/* DnsCryptCert */
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getMagic", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.magic), sizeof(cert.magic)); });
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getEsVersion", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.esVersion), sizeof(cert.esVersion)); });
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getProtocolMinorVersion", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.protocolMinorVersion), sizeof(cert.protocolMinorVersion)); });
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getSignature", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signature), sizeof(cert.signature)); });
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getResolverPublicKey", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signedData.resolverPK), sizeof(cert.signedData.resolverPK)); });
g_lua.registerFunction<std::string(DnsCryptCert::*)()>("getClientMagic", [](const DnsCryptCert& cert) { return std::string(reinterpret_cast<const char*>(cert.signedData.clientMagic), sizeof(cert.signedData.clientMagic)); });
g_lua.registerFunction<uint32_t(DnsCryptCert::*)()>("getSerial", [](const DnsCryptCert& cert) { return cert.signedData.serial; });
g_lua.registerFunction<uint32_t(DnsCryptCert::*)()>("getTSStart", [](const DnsCryptCert& cert) { return ntohl(cert.signedData.tsStart); });
g_lua.registerFunction<uint32_t(DnsCryptCert::*)()>("getTSEnd", [](const DnsCryptCert& cert) { return ntohl(cert.signedData.tsEnd); });
#endif
g_lua.writeFunction("generateDNSCryptProviderKeys", [](const std::string& publicKeyFile, const std::string privateKeyFile) {
setLuaNoSideEffect();
#ifdef HAVE_DNSCRYPT
unsigned char publicKey[DNSCRYPT_PROVIDER_PUBLIC_KEY_SIZE];
unsigned char privateKey[DNSCRYPT_PROVIDER_PRIVATE_KEY_SIZE];
sodium_mlock(privateKey, sizeof(privateKey));
try {
DnsCryptContext::generateProviderKeys(publicKey, privateKey);
ofstream pubKStream(publicKeyFile);
pubKStream.write((char*) publicKey, sizeof(publicKey));
pubKStream.close();
ofstream privKStream(privateKeyFile);
privKStream.write((char*) privateKey, sizeof(privateKey));
privKStream.close();
g_outputBuffer="Provider fingerprint is: " + DnsCryptContext::getProviderFingerprint(publicKey) + "\n";
}
catch(std::exception& e) {
errlog(e.what());
g_outputBuffer="Error: "+string(e.what())+"\n";
}
sodium_memzero(privateKey, sizeof(privateKey));
sodium_munlock(privateKey, sizeof(privateKey));
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
g_lua.writeFunction("printDNSCryptProviderFingerprint", [](const std::string& publicKeyFile) {
setLuaNoSideEffect();
#ifdef HAVE_DNSCRYPT
unsigned char publicKey[DNSCRYPT_PROVIDER_PUBLIC_KEY_SIZE];
try {
ifstream file(publicKeyFile);
file.read((char *) &publicKey, sizeof(publicKey));
if (file.fail())
throw std::runtime_error("Invalid dnscrypt provider public key file " + publicKeyFile);
file.close();
g_outputBuffer="Provider fingerprint is: " + DnsCryptContext::getProviderFingerprint(publicKey) + "\n";
}
catch(std::exception& e) {
errlog(e.what());
g_outputBuffer="Error: "+string(e.what())+"\n";
}
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
g_lua.writeFunction("generateDNSCryptCertificate", [](const std::string& providerPrivateKeyFile, const std::string& certificateFile, const std::string privateKeyFile, uint32_t serial, time_t begin, time_t end) {
setLuaNoSideEffect();
#ifdef HAVE_DNSCRYPT
DnsCryptPrivateKey privateKey;
DnsCryptCert cert;
try {
if (generateDNSCryptCertificate(providerPrivateKeyFile, serial, begin, end, cert, privateKey)) {
privateKey.saveToFile(privateKeyFile);
DnsCryptContext::saveCertFromFile(cert, certificateFile);
}
}
catch(const std::exception& e) {
errlog(e.what());
g_outputBuffer="Error: "+string(e.what())+"\n";
}
#else
g_outputBuffer="Error: DNSCrypt support is not enabled.\n";
#endif
});
g_lua.writeFunction("showPools", []() {
setLuaNoSideEffect();
try {
ostringstream ret;
boost::format fmt("%1$-20.20s %|25t|%2$20s %|25t|%3$20s %|50t|%4%" );
// 1 2 3 4
ret << (fmt % "Name" % "Cache" % "ServerPolicy" % "Servers" ) << endl;
const auto localPools = g_pools.getCopy();
for (const auto& entry : localPools) {
const string& name = entry.first;
const std::shared_ptr<ServerPool> pool = entry.second;
string cache = pool->packetCache != nullptr ? pool->packetCache->toString() : "";
string policy = g_policy.getLocal()->name;
if (pool->policy != nullptr) {
policy = pool->policy->name;
}
string servers;
for (const auto& server: pool->servers) {
if (!servers.empty()) {
servers += ", ";
}
if (!server.second->name.empty()) {
servers += server.second->name;
servers += " ";
}
servers += server.second->remote.toStringWithPort();
}
ret << (fmt % name % cache % policy % servers) << endl;
}
g_outputBuffer=ret.str();
}catch(std::exception& e) { g_outputBuffer=e.what(); throw; }
});
g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)(std::shared_ptr<DNSDistPacketCache>)>("setCache", [](std::shared_ptr<ServerPool> pool, std::shared_ptr<DNSDistPacketCache> cache) {
if (pool) {
pool->packetCache = cache;
}
});
g_lua.registerFunction("getCache", &ServerPool::getCache);
g_lua.registerFunction<void(std::shared_ptr<ServerPool>::*)()>("unsetCache", [](std::shared_ptr<ServerPool> pool) {
if (pool) {
pool->packetCache = nullptr;
}
});
g_lua.writeFunction("newPacketCache", [client](size_t maxEntries, boost::optional<uint32_t> maxTTL, boost::optional<uint32_t> minTTL, boost::optional<uint32_t> tempFailTTL, boost::optional<uint32_t> staleTTL, boost::optional<bool> dontAge) {
return std::make_shared<DNSDistPacketCache>(maxEntries, maxTTL ? *maxTTL : 86400, minTTL ? *minTTL : 0, tempFailTTL ? *tempFailTTL : 60, staleTTL ? *staleTTL : 60, dontAge ? *dontAge : false);
});
g_lua.registerFunction("toString", &DNSDistPacketCache::toString);
g_lua.registerFunction("isFull", &DNSDistPacketCache::isFull);
g_lua.registerFunction("purgeExpired", &DNSDistPacketCache::purgeExpired);
g_lua.registerFunction("expunge", &DNSDistPacketCache::expunge);
g_lua.registerFunction<void(std::shared_ptr<DNSDistPacketCache>::*)(const DNSName& dname, boost::optional<uint16_t> qtype, boost::optional<bool> suffixMatch)>("expungeByName", [](
std::shared_ptr<DNSDistPacketCache> cache,
const DNSName& dname,
boost::optional<uint16_t> qtype,
boost::optional<bool> suffixMatch) {
if (cache) {
cache->expungeByName(dname, qtype ? *qtype : QType::ANY, suffixMatch ? *suffixMatch : false);
}
});
g_lua.registerFunction<void(std::shared_ptr<DNSDistPacketCache>::*)()>("printStats", [](const std::shared_ptr<DNSDistPacketCache> cache) {
if (cache) {
g_outputBuffer="Entries: " + std::to_string(cache->getEntriesCount()) + "/" + std::to_string(cache->getMaxEntries()) + "\n";
g_outputBuffer+="Hits: " + std::to_string(cache->getHits()) + "\n";
g_outputBuffer+="Misses: " + std::to_string(cache->getMisses()) + "\n";
g_outputBuffer+="Deferred inserts: " + std::to_string(cache->getDeferredInserts()) + "\n";
g_outputBuffer+="Deferred lookups: " + std::to_string(cache->getDeferredLookups()) + "\n";
g_outputBuffer+="Lookup Collisions: " + std::to_string(cache->getLookupCollisions()) + "\n";
g_outputBuffer+="Insert Collisions: " + std::to_string(cache->getInsertCollisions()) + "\n";
g_outputBuffer+="TTL Too Shorts: " + std::to_string(cache->getTTLTooShorts()) + "\n";
}
});
g_lua.writeFunction("getPool", [client](const string& poolName) {
if (client) {
return std::make_shared<ServerPool>();
}
auto localPools = g_pools.getCopy();
std::shared_ptr<ServerPool> pool = createPoolIfNotExists(localPools, poolName);
g_pools.setState(localPools);
return pool;
});
g_lua.writeFunction("setVerboseHealthChecks", [](bool verbose) { g_verboseHealthChecks=verbose; });
g_lua.writeFunction("setStaleCacheEntriesTTL", [](uint32_t ttl) { g_staleCacheEntriesTTL = ttl; });
g_lua.writeFunction("DropResponseAction", []() {
return std::shared_ptr<DNSResponseAction>(new DropResponseAction);
});
g_lua.writeFunction("AllowResponseAction", []() {
return std::shared_ptr<DNSResponseAction>(new AllowResponseAction);
});
g_lua.writeFunction("DelayResponseAction", [](int msec) {
return std::shared_ptr<DNSResponseAction>(new DelayResponseAction(msec));
});
g_lua.writeFunction("RemoteLogAction", [](std::shared_ptr<RemoteLogger> logger, boost::optional<std::function<void(const DNSQuestion&, DNSDistProtoBufMessage*)> > alterFunc) {
#ifdef HAVE_PROTOBUF
return std::shared_ptr<DNSAction>(new RemoteLogAction(logger, alterFunc));
#else
throw std::runtime_error("Protobuf support is required to use RemoteLogAction");
#endif
});
g_lua.writeFunction("RemoteLogResponseAction", [](std::shared_ptr<RemoteLogger> logger, boost::optional<std::function<void(const DNSResponse&, DNSDistProtoBufMessage*)> > alterFunc, boost::optional<bool> includeCNAME) {
#ifdef HAVE_PROTOBUF
return std::shared_ptr<DNSResponseAction>(new RemoteLogResponseAction(logger, alterFunc, includeCNAME ? *includeCNAME : false));
#else
throw std::runtime_error("Protobuf support is required to use RemoteLogResponseAction");
#endif
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(std::string)>("setTag", [](DNSDistProtoBufMessage& message, const std::string& strValue) {
message.addTag(strValue);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(vector<pair<int, string>>)>("setTagArray", [](DNSDistProtoBufMessage& message, const vector<pair<int, string>>&tags) {
for (const auto& tag : tags) {
message.addTag(tag.second);
}
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(boost::optional <time_t> sec, boost::optional <uint32_t> uSec)>("setProtobufResponseType",
[](DNSDistProtoBufMessage& message, boost::optional <time_t> sec, boost::optional <uint32_t> uSec) {
message.setType(DNSProtoBufMessage::Response);
message.setQueryTime(sec?*sec:0, uSec?*uSec:0);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const std::string& strQueryName, uint16_t uType, uint16_t uClass, uint32_t uTTL, const std::string& strBlob)>("addResponseRR", [](DNSDistProtoBufMessage& message,
const std::string& strQueryName, uint16_t uType, uint16_t uClass, uint32_t uTTL, const std::string& strBlob) {
message.addRR(DNSName(strQueryName), uType, uClass, uTTL, strBlob);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const Netmask&)>("setEDNSSubnet", [](DNSDistProtoBufMessage& message, const Netmask& subnet) { message.setEDNSSubnet(subnet); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const DNSName&, uint16_t, uint16_t)>("setQuestion", [](DNSDistProtoBufMessage& message, const DNSName& qname, uint16_t qtype, uint16_t qclass) { message.setQuestion(qname, qtype, qclass); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(size_t)>("setBytes", [](DNSDistProtoBufMessage& message, size_t bytes) { message.setBytes(bytes); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(time_t, uint32_t)>("setTime", [](DNSDistProtoBufMessage& message, time_t sec, uint32_t usec) { message.setTime(sec, usec); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(time_t, uint32_t)>("setQueryTime", [](DNSDistProtoBufMessage& message, time_t sec, uint32_t usec) { message.setQueryTime(sec, usec); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(uint8_t)>("setResponseCode", [](DNSDistProtoBufMessage& message, uint8_t rcode) { message.setResponseCode(rcode); });
g_lua.registerFunction<std::string(DNSDistProtoBufMessage::*)()>("toDebugString", [](const DNSDistProtoBufMessage& message) { return message.toDebugString(); });
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const ComboAddress&)>("setRequestor", [](DNSDistProtoBufMessage& message, const ComboAddress& addr) {
message.setRequestor(addr);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const std::string&)>("setRequestorFromString", [](DNSDistProtoBufMessage& message, const std::string& str) {
message.setRequestor(str);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const ComboAddress&)>("setResponder", [](DNSDistProtoBufMessage& message, const ComboAddress& addr) {
message.setResponder(addr);
});
g_lua.registerFunction<void(DNSDistProtoBufMessage::*)(const std::string&)>("setResponderFromString", [](DNSDistProtoBufMessage& message, const std::string& str) {
message.setResponder(str);
});
g_lua.writeFunction("newRemoteLogger", [client](const std::string& remote, boost::optional<uint16_t> timeout, boost::optional<uint64_t> maxQueuedEntries, boost::optional<uint8_t> reconnectWaitTime) {
return std::make_shared<RemoteLogger>(ComboAddress(remote), timeout ? *timeout : 2, maxQueuedEntries ? *maxQueuedEntries : 100, reconnectWaitTime ? *reconnectWaitTime : 1);
});
g_lua.writeFunction("TeeAction", [](const std::string& remote, boost::optional<bool> addECS) {
return std::shared_ptr<DNSAction>(new TeeAction(ComboAddress(remote, 53), addECS ? *addECS : false));
});
g_lua.writeFunction("ECSPrefixLengthAction", [](uint16_t v4PrefixLength, uint16_t v6PrefixLength) {
return std::shared_ptr<DNSAction>(new ECSPrefixLengthAction(v4PrefixLength, v6PrefixLength));
});
g_lua.writeFunction("ECSOverrideAction", [](bool ecsOverride) {
return std::shared_ptr<DNSAction>(new ECSOverrideAction(ecsOverride));
});
g_lua.writeFunction("DisableECSAction", []() {
return std::shared_ptr<DNSAction>(new DisableECSAction());
});
g_lua.registerFunction<void(DNSAction::*)()>("printStats", [](const DNSAction& ta) {
setLuaNoSideEffect();
auto stats = ta.getStats();
for(const auto& s : stats) {
g_outputBuffer+=s.first+"\t";
if((uint64_t)s.second == s.second)
g_outputBuffer += std::to_string((uint64_t)s.second)+"\n";
else
g_outputBuffer += std::to_string(s.second)+"\n";
}
});
g_lua.writeFunction("getAction", [](unsigned int num) {
setLuaNoSideEffect();
boost::optional<std::shared_ptr<DNSAction>> ret;
auto rulactions = g_rulactions.getCopy();
if(num < rulactions.size())
ret=rulactions[num].second;
return ret;
});
g_lua.registerFunction("getStats", &DNSAction::getStats);
g_lua.writeFunction("addResponseAction", [](luadnsrule_t var, boost::variant<std::shared_ptr<DNSAction>, std::shared_ptr<DNSResponseAction> > era) {
if (era.type() == typeid(std::shared_ptr<DNSAction>)) {
throw std::runtime_error("addResponseAction() can only be called with response-related actions, not query-related ones. Are you looking for addAction()?");
}
auto ea = *boost::get<std::shared_ptr<DNSResponseAction>>(&era);
setLuaSideEffect();
auto rule=makeRule(var);
g_resprulactions.modify([rule, ea](decltype(g_resprulactions)::value_type& rulactions){
rulactions.push_back({rule, ea});
});
});
g_lua.writeFunction("showResponseRules", []() {
setLuaNoSideEffect();
boost::format fmt("%-3d %9d %-50s %s\n");
g_outputBuffer += (fmt % "#" % "Matches" % "Rule" % "Action").str();
int num=0;
for(const auto& lim : g_resprulactions.getCopy()) {
string name = lim.first->toString();
g_outputBuffer += (fmt % num % lim.first->d_matches % name % lim.second->toString()).str();
++num;
}
});
g_lua.writeFunction("rmResponseRule", [](unsigned int num) {
setLuaSideEffect();
auto rules = g_resprulactions.getCopy();
if(num >= rules.size()) {
g_outputBuffer = "Error: attempt to delete non-existing rule\n";
return;
}
rules.erase(rules.begin()+num);
g_resprulactions.setState(rules);
});
g_lua.writeFunction("topResponseRule", []() {
setLuaSideEffect();
auto rules = g_resprulactions.getCopy();
if(rules.empty())
return;
auto subject = *rules.rbegin();
rules.erase(std::prev(rules.end()));
rules.insert(rules.begin(), subject);
g_resprulactions.setState(rules);
});
g_lua.writeFunction("mvResponseRule", [](unsigned int from, unsigned int to) {
setLuaSideEffect();
auto rules = g_resprulactions.getCopy();
if(from >= rules.size() || to > rules.size()) {
g_outputBuffer = "Error: attempt to move rules from/to invalid index\n";
return;
}
auto subject = rules[from];
rules.erase(rules.begin()+from);
if(to == rules.size())
rules.push_back(subject);
else {
if(from < to)
--to;
rules.insert(rules.begin()+to, subject);
}
g_resprulactions.setState(rules);
});
g_lua.writeFunction("addCacheHitResponseAction", [](luadnsrule_t var, std::shared_ptr<DNSResponseAction> ea) {
setLuaSideEffect();
auto rule=makeRule(var);
g_cachehitresprulactions.modify([rule, ea](decltype(g_cachehitresprulactions)::value_type& rulactions){
rulactions.push_back({rule, ea});
});
});
g_lua.writeFunction("showCacheHitResponseRules", []() {
setLuaNoSideEffect();
boost::format fmt("%-3d %9d %-50s %s\n");
g_outputBuffer += (fmt % "#" % "Matches" % "Rule" % "Action").str();
int num=0;
for(const auto& lim : g_cachehitresprulactions.getCopy()) {
string name = lim.first->toString();