/
dnsdist-lua.cc
1514 lines (1315 loc) · 51.1 KB
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dnsdist-lua.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 <dirent.h>
#include <fstream>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <thread>
#include "dnsdist.hh"
#include "dnsdist-lua.hh"
#include "base64.hh"
#include "dnswriter.hh"
#include "dolog.hh"
#include "lock.hh"
#include "protobuf.hh"
#include "sodcrypto.hh"
#include <boost/logic/tribool.hpp>
#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
using std::thread;
static vector<std::function<void(void)>>* g_launchWork = nullptr;
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;
}
typedef std::unordered_map<std::string, boost::variant<bool, int, std::string, std::vector<std::pair<int,int> > > > localbind_t;
static void parseLocalBindVars(boost::optional<localbind_t> vars, bool& doTCP, bool& reusePort, int& tcpFastOpenQueueSize, std::string& interface, std::set<int>& cpus)
{
if (vars) {
if (vars->count("doTCP")) {
doTCP = boost::get<bool>((*vars)["doTCP"]);
}
if (vars->count("reusePort")) {
reusePort = boost::get<bool>((*vars)["reusePort"]);
}
if (vars->count("tcpFastOpenQueueSize")) {
tcpFastOpenQueueSize = boost::get<int>((*vars)["tcpFastOpenQueueSize"]);
}
if (vars->count("interface")) {
interface = boost::get<std::string>((*vars)["interface"]);
}
if (vars->count("cpus")) {
for (const auto cpu : boost::get<std::vector<std::pair<int,int>>>((*vars)["cpus"])) {
cpus.insert(cpu.second);
}
}
}
}
void setupLuaConfig(bool client)
{
typedef std::unordered_map<std::string, boost::variant<bool, std::string, vector<pair<int, std::string> > > > newserver_t;
g_lua.writeFunction("inClientStartup", [client]() {
return client && !g_configurationDone;
});
g_lua.writeFunction("newServer",
[client](boost::variant<string,newserver_t> pvars, boost::optional<int> qps) {
setLuaSideEffect();
if(client) {
return std::make_shared<DownstreamState>(ComboAddress());
}
ComboAddress sourceAddr;
unsigned int sourceItf = 0;
std::set<int> cpus;
if(auto addressStr = boost::get<string>(&pvars)) {
std::shared_ptr<DownstreamState> ret;
try {
ComboAddress address(*addressStr, 53);
if(IsAnyAddress(address)) {
g_outputBuffer="Error creating new server: invalid address for a downstream server.";
errlog("Error creating new server: %s is not a valid address for a downstream server", *addressStr);
return ret;
}
ret=std::make_shared<DownstreamState>(address);
}
catch(const PDNSException& e) {
g_outputBuffer="Error creating new server: "+string(e.reason);
errlog("Error creating new server with address %s: %s", addressStr, e.reason);
return ret;
}
catch(std::exception& e) {
g_outputBuffer="Error creating new server: "+string(e.what());
errlog("Error creating new server with address %s: %s", addressStr, e.what());
return ret;
}
if(qps) {
ret->qps=QPSLimiter(*qps, *qps);
}
g_dstates.modify([ret](servers_t& servers) {
servers.push_back(ret);
std::stable_sort(servers.begin(), servers.end(), [](const decltype(ret)& a, const decltype(ret)& b) {
return a->order < b->order;
});
});
auto localPools = g_pools.getCopy();
addServerToPool(localPools, "", ret);
g_pools.setState(localPools);
if (ret->connected) {
if(g_launchWork) {
g_launchWork->push_back([ret]() {
ret->tid = thread(responderThread, ret);
});
}
else {
ret->tid = thread(responderThread, ret);
}
}
return ret;
}
auto vars=boost::get<newserver_t>(pvars);
if(vars.count("source")) {
/* handle source in the following forms:
- v4 address ("192.0.2.1")
- v6 address ("2001:DB8::1")
- interface name ("eth0")
- v4 address and interface name ("192.0.2.1@eth0")
- v6 address and interface name ("2001:DB8::1@eth0")
*/
const string source = boost::get<string>(vars["source"]);
bool parsed = false;
std::string::size_type pos = source.find("@");
if (pos == std::string::npos) {
/* no '@', try to parse that as a valid v4/v6 address */
try {
sourceAddr = ComboAddress(source);
parsed = true;
}
catch(...)
{
}
}
if (parsed == false)
{
/* try to parse as interface name, or v4/v6@itf */
string itfName = source.substr(pos == std::string::npos ? 0 : pos + 1);
unsigned int itfIdx = if_nametoindex(itfName.c_str());
if (itfIdx != 0) {
if (pos == 0 || pos == std::string::npos) {
/* "eth0" or "@eth0" */
sourceItf = itfIdx;
}
else {
/* "192.0.2.1@eth0" */
sourceAddr = ComboAddress(source.substr(0, pos));
sourceItf = itfIdx;
}
}
else
{
warnlog("Dismissing source %s because '%s' is not a valid interface name", source, itfName);
}
}
}
std::shared_ptr<DownstreamState> ret;
try {
ComboAddress address(boost::get<string>(vars["address"]), 53);
if(IsAnyAddress(address)) {
g_outputBuffer="Error creating new server: invalid address for a downstream server.";
errlog("Error creating new server: %s is not a valid address for a downstream server", boost::get<string>(vars["address"]));
return ret;
}
ret=std::make_shared<DownstreamState>(address, sourceAddr, sourceItf);
}
catch(const PDNSException& e) {
g_outputBuffer="Error creating new server: "+string(e.reason);
errlog("Error creating new server with address %s: %s", boost::get<string>(vars["address"]), e.reason);
return ret;
}
catch(std::exception& e) {
g_outputBuffer="Error creating new server: "+string(e.what());
errlog("Error creating new server with address %s: %s", boost::get<string>(vars["address"]), e.what());
return ret;
}
if(vars.count("qps")) {
int qpsVal=std::stoi(boost::get<string>(vars["qps"]));
ret->qps=QPSLimiter(qpsVal, qpsVal);
}
if(vars.count("order")) {
ret->order=std::stoi(boost::get<string>(vars["order"]));
}
if(vars.count("weight")) {
ret->weight=std::stoi(boost::get<string>(vars["weight"]));
}
if(vars.count("retries")) {
ret->retries=std::stoi(boost::get<string>(vars["retries"]));
}
if(vars.count("tcpConnectTimeout")) {
ret->tcpConnectTimeout=std::stoi(boost::get<string>(vars["tcpConnectTimeout"]));
}
if(vars.count("tcpSendTimeout")) {
ret->tcpSendTimeout=std::stoi(boost::get<string>(vars["tcpSendTimeout"]));
}
if(vars.count("tcpRecvTimeout")) {
ret->tcpRecvTimeout=std::stoi(boost::get<string>(vars["tcpRecvTimeout"]));
}
if(vars.count("tcpFastOpen")) {
bool fastOpen = boost::get<bool>(vars["tcpFastOpen"]);
if (fastOpen) {
#ifdef MSG_FASTOPEN
ret->tcpFastOpen=true;
#else
warnlog("TCP Fast Open has been configured on downstream server %s but is not supported", boost::get<string>(vars["address"]));
#endif
}
}
if(vars.count("name")) {
ret->name=boost::get<string>(vars["name"]);
}
if(vars.count("checkName")) {
ret->checkName=DNSName(boost::get<string>(vars["checkName"]));
}
if(vars.count("checkType")) {
ret->checkType=boost::get<string>(vars["checkType"]);
}
if(vars.count("checkClass")) {
ret->checkClass=std::stoi(boost::get<string>(vars["checkClass"]));
}
if(vars.count("setCD")) {
ret->setCD=boost::get<bool>(vars["setCD"]);
}
if(vars.count("mustResolve")) {
ret->mustResolve=boost::get<bool>(vars["mustResolve"]);
}
if(vars.count("useClientSubnet")) {
ret->useECS=boost::get<bool>(vars["useClientSubnet"]);
}
if(vars.count("ipBindAddrNoPort")) {
ret->ipBindAddrNoPort=boost::get<bool>(vars["ipBindAddrNoPort"]);
}
if(vars.count("maxCheckFailures")) {
ret->maxCheckFailures=std::stoi(boost::get<string>(vars["maxCheckFailures"]));
}
if(vars.count("cpus")) {
for (const auto cpu : boost::get<vector<pair<int,string>>>(vars["cpus"])) {
cpus.insert(std::stoi(cpu.second));
}
}
/* this needs to be done _AFTER_ the order has been set,
since the server are kept ordered inside the pool */
auto localPools = g_pools.getCopy();
if(vars.count("pool")) {
if(auto* pool = boost::get<string>(&vars["pool"])) {
ret->pools.insert(*pool);
}
else {
auto pools = boost::get<vector<pair<int, string> > >(vars["pool"]);
for(auto& p : pools) {
ret->pools.insert(p.second);
}
}
for(const auto& poolName: ret->pools) {
addServerToPool(localPools, poolName, ret);
}
}
else {
addServerToPool(localPools, "", ret);
}
g_pools.setState(localPools);
if (ret->connected) {
if(g_launchWork) {
g_launchWork->push_back([ret,cpus]() {
ret->tid = thread(responderThread, ret);
if (!cpus.empty()) {
mapThreadToCPUList(ret->tid.native_handle(), cpus);
}
});
}
else {
ret->tid = thread(responderThread, ret);
if (!cpus.empty()) {
mapThreadToCPUList(ret->tid.native_handle(), cpus);
}
}
}
auto states = g_dstates.getCopy();
states.push_back(ret);
std::stable_sort(states.begin(), states.end(), [](const decltype(ret)& a, const decltype(ret)& b) {
return a->order < b->order;
});
g_dstates.setState(states);
return ret;
} );
g_lua.writeFunction("rmServer",
[](boost::variant<std::shared_ptr<DownstreamState>, int> var)
{
setLuaSideEffect();
shared_ptr<DownstreamState> server;
auto* rem = boost::get<shared_ptr<DownstreamState>>(&var);
auto states = g_dstates.getCopy();
if(rem) {
server = *rem;
}
else {
int idx = boost::get<int>(var);
server = states.at(idx);
}
auto localPools = g_pools.getCopy();
for (const string& poolName : server->pools) {
removeServerFromPool(localPools, poolName, server);
}
/* the server might also be in the default pool */
removeServerFromPool(localPools, "", server);
g_pools.setState(localPools);
states.erase(remove(states.begin(), states.end(), server), states.end());
g_dstates.setState(states);
} );
g_lua.writeFunction("setServerPolicy", [](ServerPolicy policy) {
setLuaSideEffect();
g_policy.setState(policy);
});
g_lua.writeFunction("setServerPolicyLua", [](string name, policyfunc_t policy) {
setLuaSideEffect();
g_policy.setState(ServerPolicy{name, policy});
});
g_lua.writeFunction("showServerPolicy", []() {
setLuaSideEffect();
g_outputBuffer=g_policy.getLocal()->name+"\n";
});
g_lua.writeFunction("truncateTC", [](bool tc) { setLuaSideEffect(); g_truncateTC=tc; });
g_lua.writeFunction("fixupCase", [](bool fu) { setLuaSideEffect(); g_fixupCase=fu; });
g_lua.writeFunction("addACL", [](const std::string& domain) {
setLuaSideEffect();
g_ACL.modify([domain](NetmaskGroup& nmg) { nmg.addMask(domain); });
});
g_lua.writeFunction("setLocal", [client](const std::string& addr, boost::optional<localbind_t> vars) {
setLuaSideEffect();
if(client)
return;
if (g_configurationDone) {
g_outputBuffer="setLocal cannot be used at runtime!\n";
return;
}
bool doTCP = true;
bool reusePort = false;
int tcpFastOpenQueueSize = 0;
std::string interface;
std::set<int> cpus;
parseLocalBindVars(vars, doTCP, reusePort, tcpFastOpenQueueSize, interface, cpus);
try {
ComboAddress loc(addr, 53);
g_locals.clear();
g_locals.push_back(std::make_tuple(loc, doTCP, reusePort, tcpFastOpenQueueSize, interface, cpus)); /// only works pre-startup, so no sync necessary
}
catch(std::exception& e) {
g_outputBuffer="Error: "+string(e.what())+"\n";
}
});
g_lua.writeFunction("addLocal", [client](const std::string& addr, boost::optional<localbind_t> vars) {
setLuaSideEffect();
if(client)
return;
if (g_configurationDone) {
g_outputBuffer="addLocal cannot be used at runtime!\n";
return;
}
bool doTCP = true;
bool reusePort = false;
int tcpFastOpenQueueSize = 0;
std::string interface;
std::set<int> cpus;
parseLocalBindVars(vars, doTCP, reusePort, tcpFastOpenQueueSize, interface, cpus);
try {
ComboAddress loc(addr, 53);
g_locals.push_back(std::make_tuple(loc, doTCP, reusePort, tcpFastOpenQueueSize, interface, cpus)); /// only works pre-startup, so no sync necessary
}
catch(std::exception& e) {
g_outputBuffer="Error: "+string(e.what())+"\n";
}
});
g_lua.writeFunction("setACL", [](boost::variant<string,vector<pair<int, string>>> inp) {
setLuaSideEffect();
NetmaskGroup nmg;
if(auto str = boost::get<string>(&inp)) {
nmg.addMask(*str);
}
else for(const auto& p : boost::get<vector<pair<int,string>>>(inp)) {
nmg.addMask(p.second);
}
g_ACL.setState(nmg);
});
g_lua.writeFunction("showACL", []() {
setLuaNoSideEffect();
vector<string> vec;
g_ACL.getCopy().toStringVector(&vec);
for(const auto& s : vec)
g_outputBuffer+=s+"\n";
});
g_lua.writeFunction("shutdown", []() {
#ifdef HAVE_SYSTEMD
sd_notify(0, "STOPPING=1");
#endif /* HAVE_SYSTEMD */
#if 0
// Useful for debugging leaks, but might lead to race under load
// since other threads are still runing.
for(auto& frontend : g_tlslocals) {
frontend->cleanup();
}
g_tlslocals.clear();
#ifdef HAVE_PROTOBUF
google::protobuf::ShutdownProtobufLibrary();
#endif /* HAVE_PROTOBUF */
#endif /* 0 */
_exit(0);
} );
g_lua.writeFunction("showServers", []() {
setLuaNoSideEffect();
try {
ostringstream ret;
boost::format fmt("%1$-3d %2$-20.20s %|25t|%3% %|55t|%4$5s %|51t|%5$7.1f %|66t|%6$7d %|69t|%7$3d %|78t|%8$2d %|80t|%9$10d %|86t|%10$7d %|91t|%11$5.1f %|109t|%12$5.1f %|115t|%13$11d %14%" );
// 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ret << (fmt % "#" % "Name" % "Address" % "State" % "Qps" % "Qlim" % "Ord" % "Wt" % "Queries" % "Drops" % "Drate" % "Lat" % "Outstanding" % "Pools") << endl;
uint64_t totQPS{0}, totQueries{0}, totDrops{0};
int counter=0;
auto states = g_dstates.getCopy();
for(const auto& s : states) {
string status = s->getStatus();
string pools;
for(auto& p : s->pools) {
if(!pools.empty())
pools+=" ";
pools+=p;
}
ret << (fmt % counter % s->name % s->remote.toStringWithPort() %
status %
s->queryLoad % s->qps.getRate() % s->order % s->weight % s->queries.load() % s->reuseds.load() % (s->dropRate) % (s->latencyUsec/1000.0) % s->outstanding.load() % pools) << endl;
totQPS += s->queryLoad;
totQueries += s->queries.load();
totDrops += s->reuseds.load();
++counter;
}
ret<< (fmt % "All" % "" % "" % ""
%
(double)totQPS % "" % "" % "" % totQueries % totDrops % "" % "" % "" % "" ) << endl;
g_outputBuffer=ret.str();
}catch(std::exception& e) { g_outputBuffer=e.what(); throw; }
});
g_lua.writeFunction("getServers", []() {
setLuaNoSideEffect();
vector<pair<int, std::shared_ptr<DownstreamState> > > ret;
int count=1;
for(const auto& s : g_dstates.getCopy()) {
ret.push_back(make_pair(count++, s));
}
return ret;
});
g_lua.writeFunction("getPoolServers", [](string pool) {
return getDownstreamCandidates(g_pools.getCopy(), pool);
});
g_lua.writeFunction("getServer", [client](int i) {
if (client)
return std::make_shared<DownstreamState>(ComboAddress());
return g_dstates.getCopy().at(i);
});
g_lua.writeFunction("carbonServer", [](const std::string& address, boost::optional<string> ourName,
boost::optional<unsigned int> interval) {
setLuaSideEffect();
auto ours = g_carbon.getCopy();
ours.push_back({ComboAddress(address, 2003), ourName ? *ourName : "", interval ? *interval : 30});
g_carbon.setState(ours);
});
g_lua.writeFunction("webserver", [client](const std::string& address, const std::string& password, const boost::optional<std::string> apiKey, const boost::optional<std::map<std::string, std::string> > customHeaders) {
setLuaSideEffect();
if(client)
return;
ComboAddress local(address);
try {
int sock = SSocket(local.sin4.sin_family, SOCK_STREAM, 0);
SSetsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
SBind(sock, local);
SListen(sock, 5);
auto launch=[sock, local, password, apiKey, customHeaders]() {
thread t(dnsdistWebserverThread, sock, local, password, apiKey ? *apiKey : "", customHeaders);
t.detach();
};
if(g_launchWork)
g_launchWork->push_back(launch);
else
launch();
}
catch(std::exception& e) {
g_outputBuffer="Unable to bind to webserver socket on " + local.toStringWithPort() + ": " + e.what();
errlog("Unable to bind to webserver socket on %s: %s", local.toStringWithPort(), e.what());
}
});
g_lua.writeFunction("controlSocket", [client](const std::string& str) {
setLuaSideEffect();
ComboAddress local(str, 5199);
if(client) {
g_serverControl = local;
return;
}
try {
int sock = SSocket(local.sin4.sin_family, SOCK_STREAM, 0);
SSetsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
SBind(sock, local);
SListen(sock, 5);
auto launch=[sock, local]() {
thread t(controlThread, sock, local);
t.detach();
};
if(g_launchWork)
g_launchWork->push_back(launch);
else
launch();
}
catch(std::exception& e) {
g_outputBuffer="Unable to bind to control socket on " + local.toStringWithPort() + ": " + e.what();
errlog("Unable to bind to control socket on %s: %s", local.toStringWithPort(), e.what());
}
});
g_lua.writeFunction("clearQueryCounters", []() {
unsigned int size{0};
{
WriteLock wl(&g_qcount.queryLock);
size = g_qcount.records.size();
g_qcount.records.clear();
}
boost::format fmt("%d records cleared from query counter buffer\n");
g_outputBuffer = (fmt % size).str();
});
g_lua.writeFunction("getQueryCounters", [](boost::optional<unsigned int> optMax) {
setLuaNoSideEffect();
ReadLock rl(&g_qcount.queryLock);
g_outputBuffer = "query counting is currently: ";
g_outputBuffer+= g_qcount.enabled ? "enabled" : "disabled";
g_outputBuffer+= (boost::format(" (%d records in buffer)\n") % g_qcount.records.size()).str();
boost::format fmt("%-3d %s: %d request(s)\n");
QueryCountRecords::iterator it;
unsigned int max = optMax ? *optMax : 10;
unsigned int index{1};
for(it = g_qcount.records.begin(); it != g_qcount.records.end() && index <= max; ++it, ++index) {
g_outputBuffer += (fmt % index % it->first % it->second).str();
}
});
g_lua.writeFunction("setQueryCount", [](bool enabled) { g_qcount.enabled=enabled; });
g_lua.writeFunction("setQueryCountFilter", [](QueryCountFilter func) {
g_qcount.filter = func;
});
g_lua.writeFunction("makeKey", []() {
setLuaNoSideEffect();
g_outputBuffer="setKey("+newKey()+")\n";
});
g_lua.writeFunction("setKey", [](const std::string& key) {
if(!g_configurationDone && ! g_key.empty()) { // this makes sure the commandline -k key prevails over dnsdist.conf
return; // but later setKeys() trump the -k value again
}
setLuaSideEffect();
string newkey;
if(B64Decode(key, newkey) < 0) {
g_outputBuffer=string("Unable to decode ")+key+" as Base64";
errlog("%s", g_outputBuffer);
}
else
g_key=newkey;
});
g_lua.writeFunction("testCrypto", [](boost::optional<string> optTestMsg)
{
setLuaNoSideEffect();
#ifdef HAVE_LIBSODIUM
try {
string testmsg;
if (optTestMsg) {
testmsg = *optTestMsg;
}
else {
testmsg = "testStringForCryptoTests";
}
SodiumNonce sn, sn2;
sn.init();
sn2=sn;
string encrypted = sodEncryptSym(testmsg, g_key, sn);
string decrypted = sodDecryptSym(encrypted, g_key, sn2);
sn.increment();
sn2.increment();
encrypted = sodEncryptSym(testmsg, g_key, sn);
decrypted = sodDecryptSym(encrypted, g_key, sn2);
if(testmsg == decrypted)
g_outputBuffer="Everything is ok!\n";
else
g_outputBuffer="Crypto failed..\n";
}
catch(...) {
g_outputBuffer="Crypto failed..\n";
}
#else
g_outputBuffer="Crypto not available.\n";
#endif
});
g_lua.writeFunction("setTCPRecvTimeout", [](int timeout) { g_tcpRecvTimeout=timeout; });
g_lua.writeFunction("setTCPSendTimeout", [](int timeout) { g_tcpSendTimeout=timeout; });
g_lua.writeFunction("setUDPTimeout", [](int timeout) { g_udpTimeout=timeout; });
g_lua.writeFunction("setMaxUDPOutstanding", [](uint16_t max) {
if (!g_configurationDone) {
g_maxOutstanding = max;
} else {
g_outputBuffer="Max UDP outstanding cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setMaxTCPClientThreads", [](uint64_t max) {
if (!g_configurationDone) {
g_maxTCPClientThreads = max;
} else {
g_outputBuffer="Maximum TCP client threads count cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setMaxTCPQueuedConnections", [](uint64_t max) {
if (!g_configurationDone) {
g_maxTCPQueuedConnections = max;
} else {
g_outputBuffer="The maximum number of queued TCP connections cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setMaxTCPQueriesPerConnection", [](size_t max) {
if (!g_configurationDone) {
g_maxTCPQueriesPerConn = max;
} else {
g_outputBuffer="The maximum number of queries per TCP connection cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setMaxTCPConnectionsPerClient", [](size_t max) {
if (!g_configurationDone) {
g_maxTCPConnectionsPerClient = max;
} else {
g_outputBuffer="The maximum number of TCP connection per client cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setMaxTCPConnectionDuration", [](size_t max) {
if (!g_configurationDone) {
g_maxTCPConnectionDuration = max;
} else {
g_outputBuffer="The maximum duration of a TCP connection cannot be altered at runtime!\n";
}
});
g_lua.writeFunction("setCacheCleaningDelay", [](uint32_t delay) { g_cacheCleaningDelay = delay; });
g_lua.writeFunction("setCacheCleaningPercentage", [](uint16_t percentage) { if (percentage < 100) g_cacheCleaningPercentage = percentage; else g_cacheCleaningPercentage = 100; });
g_lua.writeFunction("setECSSourcePrefixV4", [](uint16_t prefix) { g_ECSSourcePrefixV4=prefix; });
g_lua.writeFunction("setECSSourcePrefixV6", [](uint16_t prefix) { g_ECSSourcePrefixV6=prefix; });
g_lua.writeFunction("setECSOverride", [](bool override) { g_ECSOverride=override; });
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.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;
std::set<int> cpus;
parseLocalBindVars(vars, doTCP, reusePort, tcpFastOpenQueueSize, interface, cpus);
try {
DnsCryptContext ctx(providerName, certFile, keyFile);
g_dnsCryptLocals.push_back(std::make_tuple(ComboAddress(addr, 443), ctx, reusePort, tcpFastOpenQueueSize, interface, cpus));
}
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
});
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));