twister dns seeder
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#include <stdint.h>
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#include <math.h>
#include <set>
#include <map>
#include <vector>
#include <deque>
#include "netbase.h"
#include "protocol.h"
#include "util.h"
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#define MIN_RETRY 1000
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std::string static inline ToString(const CIPPort &ip) {
std::string str = ip.ToString();
while (str.size() < 22) str += ' ';
return str;
}
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class CAddrStat {
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private:
float weight;
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float count;
float reliability;
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public:
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CAddrStat() : weight(0), count(0), reliability(0) {}
void Update(bool good, int64 age, double tau) {
double f = exp(-age/tau);
reliability = reliability * f + (good ? (1.0-f) : 0);
count = count * f + 1;
weight = weight * f + (1.0-f);
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}
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IMPLEMENT_SERIALIZE (
READWRITE(weight);
READWRITE(count);
READWRITE(reliability);
)
friend class CAddrInfo;
};
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class CAddrReport {
public:
CIPPort ip;
int clientVersion;
double uptime[5];
std::string clientSubVersion;
};
class CAddrInfo {
private:
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CIPPort ip;
uint64_t services;
int64 lastTry;
int64 ourLastTry;
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int64 ignoreTill;
CAddrStat stat2H;
CAddrStat stat8H;
CAddrStat stat1D;
CAddrStat stat1W;
CAddrStat stat1M;
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int clientVersion;
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int total;
int success;
std::string clientSubVersion;
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public:
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CAddrInfo() : services(0), lastTry(0), ourLastTry(0), ignoreTill(0), clientVersion(0), total(0), success(0) {}
CAddrReport GetReport() const {
CAddrReport ret;
ret.ip = ip;
ret.clientVersion = clientVersion;
ret.clientSubVersion = clientSubVersion;
ret.uptime[0] = stat2H.reliability;
ret.uptime[1] = stat8H.reliability;
ret.uptime[2] = stat1D.reliability;
ret.uptime[3] = stat1W.reliability;
ret.uptime[4] = stat1M.reliability;
return ret;
}
bool IsGood() const {
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if (ip.GetPort() != 8333) return false;
if (!(services & NODE_NETWORK)) return false;
if (!ip.IsRoutable()) return false;
if (!ip.IsIPv4()) return false;
if (clientVersion && clientVersion < 32400) return false;
if (total <= 3 && success * 2 >= total) return true;
if (stat2H.reliability > 0.7 && stat2H.count > 1) return true;
if (stat8H.reliability > 0.6 && stat8H.count > 2) return true;
if (stat1D.reliability > 0.5 && stat1D.count > 4) return true;
if (stat1W.reliability > 0.4 && stat1W.count > 8) return true;
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return false;
}
int GetBanTime() const {
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if (IsGood()) return 0;
if (clientVersion && clientVersion < 31900) { return 1000000; }
if (stat1D.reliability < 0.01 && stat1D.count > 5) { return 500000; }
if (stat1W.reliability - stat1W.weight + 1.0 < 0.10 && stat1W.count > 4) { return 240*3600; }
return 0;
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}
int GetIgnoreTime() const {
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if (IsGood()) return 0;
if (stat2H.reliability - stat2H.weight + 1.0 < 0.2 && stat2H.count > 3) { return 3*3600; }
if (stat8H.reliability - stat8H.weight + 1.0 < 0.2 && stat8H.count > 6) { return 12*3600; }
if (stat1D.reliability - stat1D.weight + 1.0 < 0.2 && stat1D.count > 9) { return 36*3600; }
return 0;
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}
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void Update(bool good);
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friend class CAddrDb;
IMPLEMENT_SERIALIZE (
unsigned char version = 2;
READWRITE(version);
READWRITE(ip);
READWRITE(services);
READWRITE(lastTry);
unsigned char tried = ourLastTry != 0;
READWRITE(tried);
if (tried) {
READWRITE(ourLastTry);
READWRITE(ignoreTill);
READWRITE(stat2H);
READWRITE(stat8H);
READWRITE(stat1D);
READWRITE(stat1W);
if (version >= 1)
READWRITE(stat1M);
else
if (!fWrite)
*((CAddrStat*)(&stat1M)) = stat1W;
READWRITE(total);
READWRITE(success);
READWRITE(clientVersion);
if (version >= 2)
READWRITE(clientSubVersion);
}
)
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};
class CAddrDbStats {
public:
int nBanned;
int nAvail;
int nTracked;
int nNew;
int nGood;
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int nAge;
};
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// seen nodes
// / \
// (a) banned nodes available nodes--------------
// / | \
// tracked nodes (b) unknown nodes (e) active nodes
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// / \
// (d) good nodes (c) non-good nodes
class CAddrDb {
private:
mutable CCriticalSection cs;
int nId; // number of address id's
std::map<int, CAddrInfo> idToInfo; // map address id to address info (b,c,d,e)
std::map<CIPPort, int> ipToId; // map ip to id (b,c,d,e)
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std::deque<int> ourId; // sequence of tried nodes, in order we have tried connecting to them (c,d)
std::set<int> unkId; // set of nodes not yet tried (b)
std::set<int> goodId; // set of good nodes (d, good e)
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int nDirty;
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protected:
// internal routines that assume proper locks are acquired
void Add_(const CAddress &addr, bool force); // add an address
bool Get_(CIPPort &ip, int& wait); // get an IP to test (must call Good_, Bad_, or Skipped_ on result afterwards)
void Good_(const CIPPort &ip, int clientV, std::string clientSV); // mark an IP as good (must have been returned by Get_)
void Bad_(const CIPPort &ip, int ban); // mark an IP as bad (and optionally ban it) (must have been returned by Get_)
void Skipped_(const CIPPort &ip); // mark an IP as skipped (must have been returned by Get_)
int Lookup_(const CIPPort &ip); // look up id of an IP
void GetIPs_(std::set<CIP>& ips, int max, bool fOnlyIPv4); // get a random set of IPs (shared lock only)
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public:
std::map<CIPPort, time_t> banned; // nodes that are banned, with their unban time (a)
void GetStats(CAddrDbStats &stats) {
SHARED_CRITICAL_BLOCK(cs) {
stats.nBanned = banned.size();
stats.nAvail = idToInfo.size();
stats.nTracked = ourId.size();
stats.nGood = goodId.size();
stats.nNew = unkId.size();
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stats.nAge = time(NULL) - idToInfo[ourId[0]].ourLastTry;
}
}
std::vector<CAddrReport> GetAll() {
std::vector<CAddrReport> ret;
SHARED_CRITICAL_BLOCK(cs) {
for (std::deque<int>::const_iterator it = ourId.begin(); it != ourId.end(); it++) {
const CAddrInfo &info = idToInfo[*it];
if (info.success > 0) {
ret.push_back(info.GetReport());
}
}
}
return ret;
}
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// serialization code
// format:
// nVersion (0 for now)
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// n (number of ips in (b,c,d))
// CAddrInfo[n]
// banned
// acquires a shared lock (this does not suffice for read mode, but we assume that only happens at startup, single-threaded)
// this way, dumping does not interfere with GetIPs_, which is called from the DNS thread
IMPLEMENT_SERIALIZE (({
int nVersion = 0;
READWRITE(nVersion);
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SHARED_CRITICAL_BLOCK(cs) {
if (fWrite) {
CAddrDb *db = const_cast<CAddrDb*>(this);
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int n = ourId.size() + unkId.size();
READWRITE(n);
for (std::deque<int>::const_iterator it = ourId.begin(); it != ourId.end(); it++) {
std::map<int, CAddrInfo>::iterator ci = db->idToInfo.find(*it);
READWRITE((*ci).second);
}
for (std::set<int>::const_iterator it = unkId.begin(); it != unkId.end(); it++) {
std::map<int, CAddrInfo>::iterator ci = db->idToInfo.find(*it);
READWRITE((*ci).second);
}
} else {
CAddrDb *db = const_cast<CAddrDb*>(this);
db->nId = 0;
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int n;
READWRITE(n);
for (int i=0; i<n; i++) {
CAddrInfo info;
READWRITE(info);
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if (!info.GetBanTime()) {
int id = db->nId++;
db->idToInfo[id] = info;
db->ipToId[info.ip] = id;
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if (info.ourLastTry) {
db->ourId.push_back(id);
if (info.IsGood()) db->goodId.insert(id);
} else {
db->unkId.insert(id);
}
}
}
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db->nDirty++;
}
READWRITE(banned);
}
});)
void Add(const CAddress &addr, bool fForce = false) {
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CRITICAL_BLOCK(cs)
Add_(addr, fForce);
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}
void Add(const std::vector<CAddress> &vAddr, bool fForce = false) {
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CRITICAL_BLOCK(cs)
for (int i=0; i<vAddr.size(); i++)
Add_(vAddr[i], fForce);
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}
void Good(const CIPPort &addr, int clientVersion, std::string clientSubVersion) {
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CRITICAL_BLOCK(cs)
Good_(addr, clientVersion, clientSubVersion);
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}
void Skipped(const CIPPort &addr) {
CRITICAL_BLOCK(cs)
Skipped_(addr);
}
void Bad(const CIPPort &addr, int ban = 0) {
CRITICAL_BLOCK(cs)
Bad_(addr, ban);
}
bool Get(CIPPort &ip, int& wait) {
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CRITICAL_BLOCK(cs)
return Get_(ip, wait);
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}
void GetIPs(std::set<CIP>& ips, int max, bool fOnlyIPv4 = true) {
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SHARED_CRITICAL_BLOCK(cs)
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GetIPs_(ips, max, fOnlyIPv4);
}
};