[thirdparty/pdns.git] / pdns / dnsdist.hh

#pragma once
#include "config.h"
#include "ext/luawrapper/include/LuaContext.hpp"
#include <time.h>
#include "misc.hh"
#include "iputils.hh"
#include "dnsname.hh"
#include <atomic>
#include <boost/circular_buffer.hpp>
#include <boost/variant.hpp>
#include <mutex>
#include <thread>
#include "sholder.hh"
#include "dnscrypt.hh"
void* carbonDumpThread();
uint64_t uptimeOfProcess(const std::string& str);

struct DynBlock
{
  DynBlock& operator=(const DynBlock& rhs)
  {
    reason=rhs.reason;
    until=rhs.until;
    blocks.store(rhs.blocks);
    return *this;
  }
  
  string reason;
  struct timespec until;
  mutable std::atomic<unsigned int> blocks;
};

extern GlobalStateHolder<NetmaskTree<DynBlock>> g_dynblockNMG;

extern vector<pair<struct timeval, std::string> > g_confDelta;

struct DNSDistStats
{
  using stat_t=std::atomic<uint64_t>; // aww yiss ;-)
  stat_t responses{0};
  stat_t servfailResponses{0};
  stat_t queries{0};
  stat_t nonCompliantQueries{0};
  stat_t rdQueries{0};
  stat_t emptyQueries{0};
  stat_t aclDrops{0};
  stat_t blockFilter{0};
  stat_t dynBlocked{0};
  stat_t ruleDrop{0};
  stat_t ruleNXDomain{0};
  stat_t selfAnswered{0};
  stat_t downstreamTimeouts{0};
  stat_t downstreamSendErrors{0};
  stat_t truncFail{0};
  stat_t noPolicy{0};
  stat_t latency0_1{0}, latency1_10{0}, latency10_50{0}, latency50_100{0}, latency100_1000{0}, latencySlow{0};
  
  double latencyAvg100{0}, latencyAvg1000{0}, latencyAvg10000{0}, latencyAvg1000000{0};
  typedef std::function<uint64_t(const std::string&)> statfunction_t;
  typedef boost::variant<stat_t*, double*, statfunction_t> entry_t;
  std::vector<std::pair<std::string, entry_t>> entries{
    {"responses", &responses}, {"servfail-responses", &servfailResponses},
    {"queries", &queries}, {"acl-drops", &aclDrops},
    {"block-filter", &blockFilter}, {"rule-drop", &ruleDrop},
    {"rule-nxdomain", &ruleNXDomain}, {"self-answered", &selfAnswered},
    {"downstream-timeouts", &downstreamTimeouts}, {"downstream-send-errors", &downstreamSendErrors}, 
    {"trunc-failures", &truncFail}, {"no-policy", &noPolicy},
    {"latency0-1", &latency0_1}, {"latency1-10", &latency1_10},
    {"latency10-50", &latency10_50}, {"latency50-100", &latency50_100}, 
    {"latency100-1000", &latency100_1000}, {"latency-slow", &latencySlow},
    {"latency-avg100", &latencyAvg100}, {"latency-avg1000", &latencyAvg1000}, 
    {"latency-avg10000", &latencyAvg10000}, {"latency-avg1000000", &latencyAvg1000000},
    {"uptime", uptimeOfProcess},
    {"real-memory-usage", getRealMemoryUsage},
    {"noncompliant-queries", &nonCompliantQueries},
    {"rdqueries", &rdQueries},
    {"empty-queries", &emptyQueries},
    {"cpu-user-msec", getCPUTimeUser},
    {"cpu-sys-msec", getCPUTimeSystem},
    {"fd-usage", getOpenFileDescriptors}, {"dyn-blocked", &dynBlocked}, 
    {"dyn-block-nmg-size", [](const std::string&) { return g_dynblockNMG.getLocal()->size(); }}
  };
};


extern struct DNSDistStats g_stats;


struct StopWatch
{
#ifndef CLOCK_MONOTONIC_RAW
#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
#endif
  struct timespec d_start{0,0};
  void start() {  
    if(clock_gettime(CLOCK_MONOTONIC_RAW, &d_start) < 0)
      unixDie("Getting timestamp");
    
  }
  
  double udiff() const {
    struct timespec now;
    if(clock_gettime(CLOCK_MONOTONIC_RAW, &now) < 0)
      unixDie("Getting timestamp");
    
    return 1000000.0*(now.tv_sec - d_start.tv_sec) + (now.tv_nsec - d_start.tv_nsec)/1000.0;
  }

  double udiffAndSet() {
    struct timespec now;
    if(clock_gettime(CLOCK_MONOTONIC_RAW, &now) < 0)
      unixDie("Getting timestamp");
    
    auto ret= 1000000.0*(now.tv_sec - d_start.tv_sec) + (now.tv_nsec - d_start.tv_nsec)/1000.0;
    d_start = now;
    return ret;
  }

};

class QPSLimiter
{
public:
  QPSLimiter()
  {
  }

  QPSLimiter(unsigned int rate, unsigned int burst) : d_rate(rate), d_burst(burst), d_tokens(burst)
  {
    d_passthrough=false;
    d_prev.start();
  }

  unsigned int getRate() const
  {
    return d_passthrough? 0 : d_rate;
  }

  int getPassed() const
  {
    return d_passed;
  }
  int getBlocked() const
  {
    return d_blocked;
  }

  bool check() const // this is not quite fair
  {
    if(d_passthrough)
      return true;
    auto delta = d_prev.udiffAndSet();
  
    d_tokens += 1.0*d_rate * (delta/1000000.0);

    if(d_tokens > d_burst)
      d_tokens = d_burst;

    bool ret=false;
    if(d_tokens >= 1.0) { // we need this because burst=1 is weird otherwise
      ret=true;
      --d_tokens;
      d_passed++;
    }
    else
      d_blocked++;

    return ret; 
  }
private:
  bool d_passthrough{true};
  unsigned int d_rate;
  unsigned int d_burst;
  mutable double d_tokens;
  mutable StopWatch d_prev;
  mutable unsigned int d_passed{0};
  mutable unsigned int d_blocked{0};
};

struct IDState
{
  IDState() : origFD(-1), delayMsec(0) { origDest.sin4.sin_family = 0;}
  IDState(const IDState& orig)
  {
    origFD = orig.origFD;
    origID = orig.origID;
    origRemote = orig.origRemote;
    origDest = orig.origDest;
    delayMsec = orig.delayMsec;
    age.store(orig.age.load());
  }

  int origFD;  // set to <0 to indicate this state is empty   // 4

  ComboAddress origRemote;                                    // 28
  ComboAddress origDest;                                      // 28
  StopWatch sentTime;                                         // 16
  DNSName qname;                                              // 80
#ifdef HAVE_DNSCRYPT
  std::shared_ptr<DnsCryptQuery> dnsCryptQuery{0};
#endif
  std::atomic<uint16_t> age;                                  // 4
  uint16_t qtype;                                             // 2
  uint16_t origID;                                            // 2
  uint16_t origFlags;                                         // 2
  int delayMsec;
  bool ednsAdded{false};
};

struct Rings {
  Rings()
  {
    queryRing.set_capacity(10000);
    respRing.set_capacity(10000);
    pthread_rwlock_init(&queryLock, 0);
  }
  struct Query
  {
    struct timespec when;
    ComboAddress requestor;
    DNSName name;
    uint16_t size;
    uint16_t qtype;
    struct dnsheader dh;
  };
  boost::circular_buffer<Query> queryRing;
  struct Response
  {
    struct timespec when;
    ComboAddress requestor;
    DNSName name;
    uint16_t qtype;
    unsigned int usec;
    unsigned int size;
    struct dnsheader dh;
    ComboAddress ds; // who handled it
  };
  boost::circular_buffer<Response> respRing;
  std::mutex respMutex;
  pthread_rwlock_t queryLock;

  vector<pair<unsigned int, ComboAddress> > getTopBandwidth(unsigned int numentries);
  unsigned int numDistinctRequestors();
};

extern Rings g_rings;

struct ClientState
{
  ComboAddress local;
#ifdef HAVE_DNSCRYPT
  DnsCryptContext* dnscryptCtx{0};
#endif
  std::atomic<uint64_t> queries{0};
  int udpFD{-1};
  int tcpFD{-1};
};

class TCPClientCollection {
  std::vector<int> d_tcpclientthreads;
  std::atomic<uint64_t> d_pos;
public:
  std::atomic<uint64_t> d_queued, d_numthreads;

  TCPClientCollection()
  {
    d_tcpclientthreads.reserve(1024);
  }

  int getThread() 
  {
    int pos = d_pos++;
    ++d_queued;
    return d_tcpclientthreads[pos % d_numthreads];
  }
  void addTCPClientThread();
};

extern TCPClientCollection g_tcpclientthreads;

struct DownstreamState
{
  DownstreamState(const ComboAddress& remote_, const ComboAddress& sourceAddr_, unsigned int sourceItf);
  DownstreamState(const ComboAddress& remote_): DownstreamState(remote_, ComboAddress(), 0) {}
  ~DownstreamState()
  {
    if (fd >= 0)
      close(fd);
  }

  int fd{-1};
  std::thread tid;
  ComboAddress remote;
  QPSLimiter qps;
  vector<IDState> idStates;
  ComboAddress sourceAddr;
  DNSName checkName{"a.root-servers.net."};
  QType checkType{QType::A};
  std::atomic<uint64_t> idOffset{0};
  std::atomic<uint64_t> sendErrors{0};
  std::atomic<uint64_t> outstanding{0};
  std::atomic<uint64_t> reuseds{0};
  std::atomic<uint64_t> queries{0};
  struct {
    std::atomic<uint64_t> sendErrors{0};
    std::atomic<uint64_t> reuseds{0};
    std::atomic<uint64_t> queries{0};
  } prev;
  string name;
  double queryLoad{0.0};
  double dropRate{0.0};
  double latencyUsec{0.0};
  int order{1};
  int weight{1};
  int tcpRecvTimeout{30};
  int tcpSendTimeout{30};
  unsigned int sourceItf{0};
  uint16_t retries{5};
  StopWatch sw;
  set<string> pools;
  enum class Availability { Up, Down, Auto} availability{Availability::Auto};
  bool mustResolve{false};
  bool upStatus{false};
  bool useECS{false};
  bool isUp() const
  {
    if(availability == Availability::Down)
      return false;
    if(availability == Availability::Up)
      return true;
    return upStatus;
  }
  void setUp() { availability = Availability::Up; }
  void setDown() { availability = Availability::Down; }
  void setAuto() { availability = Availability::Auto; }
  string getName() const {
    if (name.empty()) {
      return remote.toStringWithPort();
    }
    return name;
  }
  string getNameWithAddr() const {
    if (name.empty()) {
      return remote.toStringWithPort();
    }
    return name + " (" + remote.toStringWithPort()+ ")";
  }

};
using servers_t =vector<std::shared_ptr<DownstreamState>>;

struct DNSQuestion
{
  DNSQuestion(const DNSName* name, uint16_t type, const ComboAddress* lc, const ComboAddress* rem, struct dnsheader* header, size_t bufferSize, uint16_t queryLen, bool isTcp): qname(name), qtype(type), local(lc), remote(rem), dh(header), size(bufferSize), len(queryLen), tcp(isTcp) {};

  const DNSName* qname;
  const uint16_t qtype;
  const ComboAddress* local;
  const ComboAddress* remote;
  struct dnsheader* dh;
  size_t size;
  uint16_t len;
  const bool tcp;
};

template <class T> using NumberedVector = std::vector<std::pair<unsigned int, T> >;

void* responderThread(std::shared_ptr<DownstreamState> state);
extern std::mutex g_luamutex;
extern LuaContext g_lua;
extern std::string g_outputBuffer; // locking for this is ok, as locked by g_luamutex

class DNSRule
{
public:
  virtual bool matches(const DNSQuestion* dq) const =0;
  virtual string toString() const = 0;
  mutable std::atomic<uint64_t> d_matches{0};
};

/* so what could you do: 
   drop, 
   fake up nxdomain, 
   provide actual answer, 
   allow & and stop processing, 
   continue processing, 
   modify header:    (servfail|refused|notimp), set TC=1,
   send to pool */

class DNSAction
{
public:
  enum class Action { Drop, Nxdomain, Spoof, Allow, HeaderModify, Pool, Delay, None};
  virtual Action operator()(DNSQuestion*, string* ruleresult) const =0;
  virtual string toString() const = 0;
};

using NumberedServerVector = NumberedVector<shared_ptr<DownstreamState>>;
typedef std::function<shared_ptr<DownstreamState>(const NumberedServerVector& servers, const DNSQuestion*)> policyfunc_t;

struct ServerPolicy
{
  string name;
  policyfunc_t policy;
};

struct CarbonConfig
{
  ComboAddress server{"0.0.0.0", 0};
  std::string ourname;
  unsigned int interval{30};
};

enum ednsHeaderFlags {
  EDNS_HEADER_FLAG_NONE = 0,
  EDNS_HEADER_FLAG_DO = 32768
};

enum ednsOptionCodes {
  EDNS0_OPTION_CODE_NONE = 0,
  EDNS0_OPTION_CODE_ECS = 8,
};

extern GlobalStateHolder<CarbonConfig> g_carbon;
extern GlobalStateHolder<ServerPolicy> g_policy;
extern GlobalStateHolder<servers_t> g_dstates;
extern GlobalStateHolder<vector<pair<std::shared_ptr<DNSRule>, std::shared_ptr<DNSAction> > > > g_rulactions;
extern GlobalStateHolder<NetmaskGroup> g_ACL;

extern ComboAddress g_serverControl; // not changed during runtime

extern std::vector<std::pair<ComboAddress, bool>> g_locals; // not changed at runtime (we hope XXX)
extern vector<ClientState*> g_frontends;
extern std::string g_key; // in theory needs locking
extern bool g_truncateTC;
extern bool g_fixupCase;
extern int g_tcpRecvTimeout;
extern int g_tcpSendTimeout;
extern uint16_t g_maxOutstanding;
extern std::atomic<bool> g_configurationDone;
extern std::atomic<uint64_t> g_maxTCPClientThreads;
extern uint16_t g_ECSSourcePrefixV4;
extern uint16_t g_ECSSourcePrefixV6;
extern bool g_ECSOverride;

struct dnsheader;

void controlThread(int fd, ComboAddress local);
vector<std::function<void(void)>> setupLua(bool client, const std::string& config);
NumberedServerVector getDownstreamCandidates(const servers_t& servers, const std::string& pool);

std::shared_ptr<DownstreamState> firstAvailable(const NumberedServerVector& servers, const DNSQuestion* dq);

std::shared_ptr<DownstreamState> leastOutstanding(const NumberedServerVector& servers, const DNSQuestion* dq);
std::shared_ptr<DownstreamState> wrandom(const NumberedServerVector& servers, const DNSQuestion* dq);
std::shared_ptr<DownstreamState> whashed(const NumberedServerVector& servers, const DNSQuestion* dq);
std::shared_ptr<DownstreamState> roundrobin(const NumberedServerVector& servers, const DNSQuestion* dq);
int getEDNSZ(const char* packet, unsigned int len);
void spoofResponseFromString(DNSQuestion& dq, const string& spoofContent);
uint16_t getEDNSOptionCode(const char * packet, size_t len);
void dnsdistWebserverThread(int sock, const ComboAddress& local, const string& password);
bool getMsgLen32(int fd, uint32_t* len);
bool putMsgLen32(int fd, uint32_t len);
void* tcpAcceptorThread(void* p);

void moreLua();
void doClient(ComboAddress server, const std::string& command);
void doConsole();
void controlClientThread(int fd, ComboAddress client);
extern "C" {
char** my_completion( const char * text , int start,  int end);
}
void setLuaNoSideEffect(); // if nothing has been declared, set that there are no side effects
void setLuaSideEffect();   // set to report a side effect, cancelling all _no_ side effect calls
bool getLuaNoSideEffect(); // set if there were only explicit declarations of _no_ side effect
void resetLuaSideEffect(); // reset to indeterminate state

#ifdef HAVE_DNSCRYPT
extern std::vector<std::pair<ComboAddress,DnsCryptContext>> g_dnsCryptLocals;

int handleDnsCryptQuery(DnsCryptContext* ctx, char* packet, uint16_t len, std::shared_ptr<DnsCryptQuery>& query, uint16_t* decryptedQueryLen, bool tcp, std::vector<uint8_t>& reponse);
#endif
Commit	Line	Data
df111b53	1	#pragma once
11e1e08b	2	#include "config.h"
df111b53	3	#include "ext/luawrapper/include/LuaContext.hpp"
	4	#include <time.h>
	5	#include "misc.hh"
	6	#include "iputils.hh"
	7	#include "dnsname.hh"
	8	#include <atomic>
	9	#include <boost/circular_buffer.hpp>
e16fd59c	10	#include <boost/variant.hpp>
df111b53	11	#include <mutex>
df111b53	12	#include <thread>
ecbe9133	13	#include "sholder.hh"
11e1e08b	14	#include "dnscrypt.hh"
42fae326	15	void* carbonDumpThread();
61d1b966	16	uint64_t uptimeOfProcess(const std::string& str);
bd1c631b	17
78ffa782	18	struct DynBlock
	19	{
	20	DynBlock& operator=(const DynBlock& rhs)
	21	{
	22	reason=rhs.reason;
	23	until=rhs.until;
	24	blocks.store(rhs.blocks);
	25	return *this;
	26	}
	27
	28	string reason;
	29	struct timespec until;
	30	mutable std::atomic<unsigned int> blocks;
	31	};
	32
	33	extern GlobalStateHolder<NetmaskTree<DynBlock>> g_dynblockNMG;
f758857a	34
	35	extern vector<pair<struct timeval, std::string> > g_confDelta;
	36
e48090d1	37	struct DNSDistStats
e48090d1	38	{
6ad8b29a	39	using stat_t=std::atomic<uint64_t>; // aww yiss ;-)
e48090d1	40	stat_t responses{0};
	41	stat_t servfailResponses{0};
	42	stat_t queries{0};
e73ec7d3	43	stat_t nonCompliantQueries{0};
643a182a	44	stat_t rdQueries{0};
2efd427d	45	stat_t emptyQueries{0};
e48090d1	46	stat_t aclDrops{0};
e48090d1	47	stat_t blockFilter{0};
bd1c631b	48	stat_t dynBlocked{0};
e48090d1	49	stat_t ruleDrop{0};
	50	stat_t ruleNXDomain{0};
	51	stat_t selfAnswered{0};
	52	stat_t downstreamTimeouts{0};
	53	stat_t downstreamSendErrors{0};
6ad8b29a	54	stat_t truncFail{0};
b8bc7e61	55	stat_t noPolicy{0};
42fae326	56	stat_t latency0_1{0}, latency1_10{0}, latency10_50{0}, latency50_100{0}, latency100_1000{0}, latencySlow{0};
e48090d1	57
e16fd59c	58	double latencyAvg100{0}, latencyAvg1000{0}, latencyAvg10000{0}, latencyAvg1000000{0};
a1a787dc	59	typedef std::function<uint64_t(const std::string&)> statfunction_t;
a1a787dc	60	typedef boost::variant<stat_t, double, statfunction_t> entry_t;
e16fd59c	61	std::vector<std::pair<std::string, entry_t>> entries{
42fae326	62	{"responses", &responses}, {"servfail-responses", &servfailResponses},
	63	{"queries", &queries}, {"acl-drops", &aclDrops},
	64	{"block-filter", &blockFilter}, {"rule-drop", &ruleDrop},
	65	{"rule-nxdomain", &ruleNXDomain}, {"self-answered", &selfAnswered},
	66	{"downstream-timeouts", &downstreamTimeouts}, {"downstream-send-errors", &downstreamSendErrors},
	67	{"trunc-failures", &truncFail}, {"no-policy", &noPolicy},
	68	{"latency0-1", &latency0_1}, {"latency1-10", &latency1_10},
	69	{"latency10-50", &latency10_50}, {"latency50-100", &latency50_100},
e16fd59c	70	{"latency100-1000", &latency100_1000}, {"latency-slow", &latencySlow},
e16fd59c	71	{"latency-avg100", &latencyAvg100}, {"latency-avg1000", &latencyAvg1000},
a1a787dc	72	{"latency-avg10000", &latencyAvg10000}, {"latency-avg1000000", &latencyAvg1000000},
61d1b966	73	{"uptime", uptimeOfProcess},
a9b6db56	74	{"real-memory-usage", getRealMemoryUsage},
a2aa00ed	75	{"noncompliant-queries", &nonCompliantQueries},
643a182a	76	{"rdqueries", &rdQueries},
2efd427d	77	{"empty-queries", &emptyQueries},
4f99f3d3 RG	78	{"cpu-user-msec", getCPUTimeUser},
4f99f3d3 RG	79	{"cpu-sys-msec", getCPUTimeSystem},
bd1c631b	80	{"fd-usage", getOpenFileDescriptors}, {"dyn-blocked", &dynBlocked},
bd1c631b	81	{"dyn-block-nmg-size", [](const std::string&) { return g_dynblockNMG.getLocal()->size(); }}
42fae326	82	};
e48090d1	83	};
e48090d1	84
e16fd59c	85
e48090d1	86	extern struct DNSDistStats g_stats;
e48090d1	87
638184e9	88
df111b53	89	struct StopWatch
	90	{
	91	#ifndef CLOCK_MONOTONIC_RAW
	92	#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
	93	#endif
	94	struct timespec d_start{0,0};
	95	void start() {
	96	if(clock_gettime(CLOCK_MONOTONIC_RAW, &d_start) < 0)
	97	unixDie("Getting timestamp");
	98
	99	}
	100
	101	double udiff() const {
	102	struct timespec now;
	103	if(clock_gettime(CLOCK_MONOTONIC_RAW, &now) < 0)
	104	unixDie("Getting timestamp");
	105
	106	return 1000000.0*(now.tv_sec - d_start.tv_sec) + (now.tv_nsec - d_start.tv_nsec)/1000.0;
	107	}
	108
	109	double udiffAndSet() {
	110	struct timespec now;
	111	if(clock_gettime(CLOCK_MONOTONIC_RAW, &now) < 0)
	112	unixDie("Getting timestamp");
	113
	114	auto ret= 1000000.0*(now.tv_sec - d_start.tv_sec) + (now.tv_nsec - d_start.tv_nsec)/1000.0;
	115	d_start = now;
	116	return ret;
	117	}
	118
	119	};
	120
	121	class QPSLimiter
	122	{
	123	public:
	124	QPSLimiter()
	125	{
	126	}
	127
	128	QPSLimiter(unsigned int rate, unsigned int burst) : d_rate(rate), d_burst(burst), d_tokens(burst)
	129	{
	130	d_passthrough=false;
	131	d_prev.start();
	132	}
	133
	134	unsigned int getRate() const
	135	{
	136	return d_passthrough? 0 : d_rate;
	137	}
	138
	139	int getPassed() const
	140	{
	141	return d_passed;
	142	}
	143	int getBlocked() const
	144	{
	145	return d_blocked;
	146	}
	147
ecbe9133	148	bool check() const // this is not quite fair
df111b53	149	{
	150	if(d_passthrough)
	151	return true;
	152	auto delta = d_prev.udiffAndSet();
	153
	154	d_tokens += 1.0d_rate (delta/1000000.0);
	155
	156	if(d_tokens > d_burst)
	157	d_tokens = d_burst;
	158
	159	bool ret=false;
	160	if(d_tokens >= 1.0) { // we need this because burst=1 is weird otherwise
	161	ret=true;
	162	--d_tokens;
	163	d_passed++;
	164	}
	165	else
	166	d_blocked++;
	167
	168	return ret;
	169	}
	170	private:
	171	bool d_passthrough{true};
	172	unsigned int d_rate;
	173	unsigned int d_burst;
ecbe9133	174	mutable double d_tokens;
	175	mutable StopWatch d_prev;
	176	mutable unsigned int d_passed{0};
	177	mutable unsigned int d_blocked{0};
df111b53	178	};
df111b53	179
df111b53	180	struct IDState
df111b53	181	{
c9ba8478	182	IDState() : origFD(-1), delayMsec(0) { origDest.sin4.sin_family = 0;}
df111b53	183	IDState(const IDState& orig)
	184	{
	185	origFD = orig.origFD;
	186	origID = orig.origID;
	187	origRemote = orig.origRemote;
549d63c9	188	origDest = orig.origDest;
7b3865cd	189	delayMsec = orig.delayMsec;
df111b53	190	age.store(orig.age.load());
	191	}
	192
2bf26975	193	int origFD; // set to <0 to indicate this state is empty // 4
	194
	195	ComboAddress origRemote; // 28
549d63c9	196	ComboAddress origDest; // 28
2bf26975	197	StopWatch sentTime; // 16
2bf26975	198	DNSName qname; // 80
11e1e08b RG	199	#ifdef HAVE_DNSCRYPT
	200	std::shared_ptr<DnsCryptQuery> dnsCryptQuery{0};
	201	#endif
2bf26975	202	std::atomic<uint16_t> age; // 4
	203	uint16_t qtype; // 2
	204	uint16_t origID; // 2
aeb36780	205	uint16_t origFlags; // 2
7b3865cd	206	int delayMsec;
ca404e94	207	bool ednsAdded{false};
df111b53	208	};
	209
	210	struct Rings {
	211	Rings()
	212	{
df111b53	213	queryRing.set_capacity(10000);
df111b53	214	respRing.set_capacity(10000);
0e41337b	215	pthread_rwlock_init(&queryLock, 0);
df111b53	216	}
0ba5eecf	217	struct Query
	218	{
	219	struct timespec when;
	220	ComboAddress requestor;
	221	DNSName name;
03ebf8b2	222	uint16_t size;
0ba5eecf	223	uint16_t qtype;
3fcaeeac	224	struct dnsheader dh;
0ba5eecf	225	};
0ba5eecf	226	boost::circular_buffer<Query> queryRing;
df111b53	227	struct Response
df111b53	228	{
80a216c9	229	struct timespec when;
80a216c9	230	ComboAddress requestor;
df111b53	231	DNSName name;
df111b53	232	uint16_t qtype;
df111b53	233	unsigned int usec;
80a216c9	234	unsigned int size;
3fcaeeac	235	struct dnsheader dh;
2d11d1b2	236	ComboAddress ds; // who handled it
df111b53	237	};
	238	boost::circular_buffer<Response> respRing;
	239	std::mutex respMutex;
0e41337b	240	pthread_rwlock_t queryLock;
03ebf8b2	241
ddafcf1e	242	vector<pair<unsigned int, ComboAddress> > getTopBandwidth(unsigned int numentries);
03ebf8b2	243	unsigned int numDistinctRequestors();
df111b53	244	};
df111b53	245
0e41337b	246	extern Rings g_rings;
df111b53	247
8a5d5053	248	struct ClientState
	249	{
	250	ComboAddress local;
11e1e08b RG	251	#ifdef HAVE_DNSCRYPT
	252	DnsCryptContext* dnscryptCtx{0};
	253	#endif
963bef8d	254	std::atomic<uint64_t> queries{0};
a36ce055 RG	255	int udpFD{-1};
a36ce055 RG	256	int tcpFD{-1};
8a5d5053	257	};
	258
	259	class TCPClientCollection {
	260	std::vector<int> d_tcpclientthreads;
	261	std::atomic<uint64_t> d_pos;
	262	public:
	263	std::atomic<uint64_t> d_queued, d_numthreads;
	264
	265	TCPClientCollection()
	266	{
	267	d_tcpclientthreads.reserve(1024);
	268	}
	269
	270	int getThread()
	271	{
	272	int pos = d_pos++;
	273	++d_queued;
	274	return d_tcpclientthreads[pos % d_numthreads];
	275	}
	276	void addTCPClientThread();
	277	};
	278
	279	extern TCPClientCollection g_tcpclientthreads;
	280
df111b53	281	struct DownstreamState
df111b53	282	{
fbe2a2e0 RG	283	DownstreamState(const ComboAddress& remote_, const ComboAddress& sourceAddr_, unsigned int sourceItf);
fbe2a2e0 RG	284	DownstreamState(const ComboAddress& remote_): DownstreamState(remote_, ComboAddress(), 0) {}
6a62c0e3 RG	285	~DownstreamState()
	286	{
	287	if (fd >= 0)
	288	close(fd);
	289	}
df111b53	290
f99e3aaf	291	int fd{-1};
df111b53	292	std::thread tid;
	293	ComboAddress remote;
	294	QPSLimiter qps;
	295	vector<IDState> idStates;
fbe2a2e0 RG	296	ComboAddress sourceAddr;
	297	DNSName checkName{"a.root-servers.net."};
	298	QType checkType{QType::A};
df111b53	299	std::atomic<uint64_t> idOffset{0};
	300	std::atomic<uint64_t> sendErrors{0};
	301	std::atomic<uint64_t> outstanding{0};
	302	std::atomic<uint64_t> reuseds{0};
	303	std::atomic<uint64_t> queries{0};
	304	struct {
	305	std::atomic<uint64_t> sendErrors{0};
	306	std::atomic<uint64_t> reuseds{0};
	307	std::atomic<uint64_t> queries{0};
	308	} prev;
18eeccc9	309	string name;
df111b53	310	double queryLoad{0.0};
	311	double dropRate{0.0};
	312	double latencyUsec{0.0};
	313	int order{1};
	314	int weight{1};
3f6d07a4 RG	315	int tcpRecvTimeout{30};
3f6d07a4 RG	316	int tcpSendTimeout{30};
fbe2a2e0	317	unsigned int sourceItf{0};
3f6d07a4	318	uint16_t retries{5};
df111b53	319	StopWatch sw;
	320	set<string> pools;
	321	enum class Availability { Up, Down, Auto} availability{Availability::Auto};
fbe2a2e0	322	bool mustResolve{false};
df111b53	323	bool upStatus{false};
ca404e94	324	bool useECS{false};
df111b53	325	bool isUp() const
	326	{
	327	if(availability == Availability::Down)
	328	return false;
	329	if(availability == Availability::Up)
	330	return true;
	331	return upStatus;
	332	}
	333	void setUp() { availability = Availability::Up; }
	334	void setDown() { availability = Availability::Down; }
	335	void setAuto() { availability = Availability::Auto; }
18eeccc9 RG	336	string getName() const {
	337	if (name.empty()) {
	338	return remote.toStringWithPort();
	339	}
	340	return name;
	341	}
a7940c06	342	string getNameWithAddr() const {
	343	if (name.empty()) {
	344	return remote.toStringWithPort();
	345	}
	346	return name + " (" + remote.toStringWithPort()+ ")";
	347	}
	348
df111b53	349	};
df111b53	350	using servers_t =vector<std::shared_ptr<DownstreamState>>;
df111b53	351
497a6e3a RG	352	struct DNSQuestion
	353	{
	354	DNSQuestion(const DNSName* name, uint16_t type, const ComboAddress* lc, const ComboAddress* rem, struct dnsheader* header, size_t bufferSize, uint16_t queryLen, bool isTcp): qname(name), qtype(type), local(lc), remote(rem), dh(header), size(bufferSize), len(queryLen), tcp(isTcp) {};
	355
	356	const DNSName* qname;
	357	const uint16_t qtype;
	358	const ComboAddress* local;
	359	const ComboAddress* remote;
	360	struct dnsheader* dh;
	361	size_t size;
	362	uint16_t len;
	363	const bool tcp;
	364	};
	365
da4e7813	366	template <class T> using NumberedVector = std::vector<std::pair<unsigned int, T> >;
	367
	368	void* responderThread(std::shared_ptr<DownstreamState> state);
	369	extern std::mutex g_luamutex;
	370	extern LuaContext g_lua;
	371	extern std::string g_outputBuffer; // locking for this is ok, as locked by g_luamutex
	372
0940e4eb	373	class DNSRule
	374	{
	375	public:
497a6e3a	376	virtual bool matches(const DNSQuestion* dq) const =0;
0940e4eb	377	virtual string toString() const = 0;
	378	mutable std::atomic<uint64_t> d_matches{0};
	379	};
	380
	381	/* so what could you do:
	382	drop,
	383	fake up nxdomain,
	384	provide actual answer,
	385	allow & and stop processing,
	386	continue processing,
	387	modify header: (servfail\|refused\|notimp), set TC=1,
	388	send to pool */
	389
	390	class DNSAction
	391	{
	392	public:
7b3865cd	393	enum class Action { Drop, Nxdomain, Spoof, Allow, HeaderModify, Pool, Delay, None};
497a6e3a	394	virtual Action operator()(DNSQuestion, string ruleresult) const =0;
0940e4eb	395	virtual string toString() const = 0;
	396	};
	397
da4e7813	398	using NumberedServerVector = NumberedVector<shared_ptr<DownstreamState>>;
497a6e3a	399	typedef std::function<shared_ptr<DownstreamState>(const NumberedServerVector& servers, const DNSQuestion*)> policyfunc_t;
df111b53	400
	401	struct ServerPolicy
	402	{
	403	string name;
70a57b05	404	policyfunc_t policy;
df111b53	405	};
df111b53	406
42fae326	407	struct CarbonConfig
	408	{
	409	ComboAddress server{"0.0.0.0", 0};
	410	std::string ourname;
	411	unsigned int interval{30};
	412	};
	413
ca404e94 RG	414	enum ednsHeaderFlags {
	415	EDNS_HEADER_FLAG_NONE = 0,
	416	EDNS_HEADER_FLAG_DO = 32768
	417	};
	418
	419	enum ednsOptionCodes {
	420	EDNS0_OPTION_CODE_NONE = 0,
	421	EDNS0_OPTION_CODE_ECS = 8,
	422	};
	423
42fae326	424	extern GlobalStateHolder<CarbonConfig> g_carbon;
ecbe9133	425	extern GlobalStateHolder<ServerPolicy> g_policy;
ecbe9133	426	extern GlobalStateHolder<servers_t> g_dstates;
0940e4eb	427	extern GlobalStateHolder<vector<pair<std::shared_ptr<DNSRule>, std::shared_ptr<DNSAction> > > > g_rulactions;
638184e9	428	extern GlobalStateHolder<NetmaskGroup> g_ACL;
2e72cc0e	429
ecbe9133	430	extern ComboAddress g_serverControl; // not changed during runtime
ecbe9133	431
652a7355	432	extern std::vector<std::pair<ComboAddress, bool>> g_locals; // not changed at runtime (we hope XXX)
963bef8d	433	extern vector<ClientState*> g_frontends;
ecbe9133	434	extern std::string g_key; // in theory needs locking
6ad8b29a	435	extern bool g_truncateTC;
b29edbee	436	extern bool g_fixupCase;
3f6d07a4 RG	437	extern int g_tcpRecvTimeout;
3f6d07a4 RG	438	extern int g_tcpSendTimeout;
e41f8165 RG	439	extern uint16_t g_maxOutstanding;
	440	extern std::atomic<bool> g_configurationDone;
	441	extern std::atomic<uint64_t> g_maxTCPClientThreads;
ca404e94 RG	442	extern uint16_t g_ECSSourcePrefixV4;
	443	extern uint16_t g_ECSSourcePrefixV6;
	444	extern bool g_ECSOverride;
	445
ecbe9133	446	struct dnsheader;
	447
	448	void controlThread(int fd, ComboAddress local);
839f3021	449	vector<std::function<void(void)>> setupLua(bool client, const std::string& config);
da4e7813	450	NumberedServerVector getDownstreamCandidates(const servers_t& servers, const std::string& pool);
da4e7813	451
497a6e3a	452	std::shared_ptr<DownstreamState> firstAvailable(const NumberedServerVector& servers, const DNSQuestion* dq);
ecbe9133	453
497a6e3a RG	454	std::shared_ptr<DownstreamState> leastOutstanding(const NumberedServerVector& servers, const DNSQuestion* dq);
	455	std::shared_ptr<DownstreamState> wrandom(const NumberedServerVector& servers, const DNSQuestion* dq);
	456	std::shared_ptr<DownstreamState> whashed(const NumberedServerVector& servers, const DNSQuestion* dq);
	457	std::shared_ptr<DownstreamState> roundrobin(const NumberedServerVector& servers, const DNSQuestion* dq);
520eb5a0	458	int getEDNSZ(const char* packet, unsigned int len);
6ca7a40a	459	void spoofResponseFromString(DNSQuestion& dq, const string& spoofContent);
ca404e94	460	uint16_t getEDNSOptionCode(const char * packet, size_t len);
50bed881	461	void dnsdistWebserverThread(int sock, const ComboAddress& local, const string& password);
6885d4bf	462	bool getMsgLen32(int fd, uint32_t* len);
6885d4bf	463	bool putMsgLen32(int fd, uint32_t len);
d8d85a30	464	void* tcpAcceptorThread(void* p);
80a216c9	465
80a216c9	466	void moreLua();
ffb07158	467	void doClient(ComboAddress server, const std::string& command);
	468	void doConsole();
	469	void controlClientThread(int fd, ComboAddress client);
	470	extern "C" {
	471	char** my_completion( const char * text , int start, int end);
	472	}
f758857a	473	void setLuaNoSideEffect(); // if nothing has been declared, set that there are no side effects
	474	void setLuaSideEffect(); // set to report a side effect, cancelling all _no_ side effect calls
	475	bool getLuaNoSideEffect(); // set if there were only explicit declarations of _no_ side effect
	476	void resetLuaSideEffect(); // reset to indeterminate state
11e1e08b RG	477
	478	#ifdef HAVE_DNSCRYPT
	479	extern std::vector<std::pair<ComboAddress,DnsCryptContext>> g_dnsCryptLocals;
	480
	481	int handleDnsCryptQuery(DnsCryptContext* ctx, char* packet, uint16_t len, std::shared_ptr<DnsCryptQuery>& query, uint16_t* decryptedQueryLen, bool tcp, std::vector<uint8_t>& reponse);
	482	#endif