Merge #8688: Move static global randomizer seeds into CConnman

d9ff591 Move static global randomizer seeds into CConnman (Pieter Wuille)

Author: laanwj

src/init.cpp

@@ -1116,7 +1116,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     // ********************************************************* Step 6: network initialization
 
     assert(!g_connman);
-    g_connman = std::unique_ptr<CConnman>(new CConnman());
+    g_connman = std::unique_ptr<CConnman>(new CConnman(GetRand(std::numeric_limits<uint64_t>::max()), GetRand(std::numeric_limits<uint64_t>::max())));
     CConnman& connman = *g_connman;
 
     RegisterNodeSignals(GetNodeSignals());

src/main.cpp

@@ -113,6 +113,8 @@ CScript COINBASE_FLAGS;
 
 const string strMessageMagic = "Bitcoin Signed Message:\n";
 
+static const uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL; // SHA256("main address relay")[0:8]
+
 // Internal stuff
 namespace {
 
@@ -4739,11 +4741,9 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
     // Relay to a limited number of other nodes
     // Use deterministic randomness to send to the same nodes for 24 hours
     // at a time so the addrKnowns of the chosen nodes prevent repeats
-    static const uint64_t salt0 = GetRand(std::numeric_limits<uint64_t>::max());
-    static const uint64_t salt1 = GetRand(std::numeric_limits<uint64_t>::max());
     uint64_t hashAddr = addr.GetHash();
     std::multimap<uint64_t, CNode*> mapMix;
-    const CSipHasher hasher = CSipHasher(salt0, salt1).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
+    const CSipHasher hasher = connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
 
     auto sortfunc = [&mapMix, &hasher](CNode* pnode) {
         if (pnode->nVersion >= CADDR_TIME_VERSION) {

src/net.cpp

@@ -63,6 +63,7 @@
 
 const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
 
+static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL; // SHA256("netgroup")[0:8]
 //
 // Global state variables
 //
@@ -387,7 +388,7 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
         addrman.Attempt(addrConnect, fCountFailure);
 
         // Add node
-        CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addrConnect, pszDest ? pszDest : "", false);
+        CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), pszDest ? pszDest : "", false);
         GetNodeSignals().InitializeNode(pnode->GetId(), pnode);
         pnode->AddRef();
 
@@ -1022,7 +1023,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
         }
     }
 
-    CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addr, "", true);
+    CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), "", true);
     GetNodeSignals().InitializeNode(pnode->GetId(), pnode);
     pnode->AddRef();
     pnode->fWhitelisted = whitelisted;
@@ -2023,7 +2024,7 @@ void Discover(boost::thread_group& threadGroup)
 #endif
 }
 
-CConnman::CConnman()
+CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In) : nSeed0(nSeed0In), nSeed1(nSeed1In)
 {
     setBannedIsDirty = false;
     fAddressesInitialized = false;
@@ -2109,7 +2110,7 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st
     if (pnodeLocalHost == NULL) {
         CNetAddr local;
         LookupHost("127.0.0.1", local, false);
-        pnodeLocalHost = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), INVALID_SOCKET, CAddress(CService(local, 0), nLocalServices));
+        pnodeLocalHost = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), INVALID_SOCKET, CAddress(CService(local, 0), nLocalServices), 0);
         GetNodeSignals().InitializeNode(pnodeLocalHost->GetId(), pnodeLocalHost);
     }
 
@@ -2499,10 +2500,10 @@ void CNode::Fuzz(int nChance)
 unsigned int CConnman::GetReceiveFloodSize() const { return nReceiveFloodSize; }
 unsigned int CConnman::GetSendBufferSize() const{ return nSendBufferMaxSize; }
 
-CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, const std::string& addrNameIn, bool fInboundIn) :
+CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, uint64_t nKeyedNetGroupIn, const std::string& addrNameIn, bool fInboundIn) :
     ssSend(SER_NETWORK, INIT_PROTO_VERSION),
     addr(addrIn),
-    nKeyedNetGroup(CalculateKeyedNetGroup(addrIn)),
+    nKeyedNetGroup(nKeyedNetGroupIn),
     addrKnown(5000, 0.001),
     filterInventoryKnown(50000, 0.000001)
 {
@@ -2695,12 +2696,14 @@ int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) {
     return nNow + (int64_t)(log1p(GetRand(1ULL << 48) * -0.0000000000000035527136788 /* -1/2^48 */) * average_interval_seconds * -1000000.0 + 0.5);
 }
 
-/* static */ uint64_t CNode::CalculateKeyedNetGroup(const CAddress& ad)
+CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id)
 {
-    static const uint64_t k0 = GetRand(std::numeric_limits<uint64_t>::max());
-    static const uint64_t k1 = GetRand(std::numeric_limits<uint64_t>::max());
+    return CSipHasher(nSeed0, nSeed1).Write(id);
+}
 
+uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& ad)
+{
     std::vector<unsigned char> vchNetGroup(ad.GetGroup());
 
-    return CSipHasher(k0, k1).Write(&vchNetGroup[0], vchNetGroup.size()).Finalize();
+    return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(&vchNetGroup[0], vchNetGroup.size()).Finalize();
 }

src/net.h

@@ -11,6 +11,7 @@
 #include "amount.h"
 #include "bloom.h"
 #include "compat.h"
+#include "hash.h"
 #include "limitedmap.h"
 #include "netaddress.h"
 #include "protocol.h"
@@ -125,7 +126,7 @@ class CConnman
         uint64_t nMaxOutboundTimeframe = 0;
         uint64_t nMaxOutboundLimit = 0;
     };
-    CConnman();
+    CConnman(uint64_t seed0, uint64_t seed1);
     ~CConnman();
     bool Start(boost::thread_group& threadGroup, CScheduler& scheduler, std::string& strNodeError, Options options);
     void Stop();
@@ -298,6 +299,8 @@ class CConnman
     void SetBestHeight(int height);
     int GetBestHeight() const;
 
+    /** Get a unique deterministic randomizer. */
+    CSipHasher GetDeterministicRandomizer(uint64_t id);
 
 private:
     struct ListenSocket {
@@ -315,6 +318,8 @@ class CConnman
     void ThreadSocketHandler();
     void ThreadDNSAddressSeed();
 
+    uint64_t CalculateKeyedNetGroup(const CAddress& ad);
+
     CNode* FindNode(const CNetAddr& ip);
     CNode* FindNode(const CSubNet& subNet);
     CNode* FindNode(const std::string& addrName);
@@ -392,6 +397,9 @@ class CConnman
     int nMaxFeeler;
     std::atomic<int> nBestHeight;
     CClientUIInterface* clientInterface;
+
+    /** SipHasher seeds for deterministic randomness */
+    const uint64_t nSeed0, nSeed1;
 };
 extern std::unique_ptr<CConnman> g_connman;
 void Discover(boost::thread_group& threadGroup);
@@ -660,14 +668,13 @@ class CNode
     CAmount lastSentFeeFilter;
     int64_t nextSendTimeFeeFilter;
 
-    CNode(NodeId id, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress &addrIn, const std::string &addrNameIn = "", bool fInboundIn = false);
+    CNode(NodeId id, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress &addrIn, uint64_t nKeyedNetGroupIn, const std::string &addrNameIn = "", bool fInboundIn = false);
     ~CNode();
 
 private:
     CNode(const CNode&);
     void operator=(const CNode&);
 
-    static uint64_t CalculateKeyedNetGroup(const CAddress& ad);
 
     uint64_t nLocalHostNonce;
     ServiceFlags nLocalServices;

src/test/DoS_tests.cpp

@@ -48,7 +48,7 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
 {
     connman->ClearBanned();
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, "", true);
+    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, "", true);
     GetNodeSignals().InitializeNode(dummyNode1.GetId(), &dummyNode1);
     dummyNode1.nVersion = 1;
     Misbehaving(dummyNode1.GetId(), 100); // Should get banned
@@ -57,7 +57,7 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     BOOST_CHECK(!connman->IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
 
     CAddress addr2(ip(0xa0b0c002), NODE_NONE);
-    CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, "", true);
+    CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, "", true);
     GetNodeSignals().InitializeNode(dummyNode2.GetId(), &dummyNode2);
     dummyNode2.nVersion = 1;
     Misbehaving(dummyNode2.GetId(), 50);
@@ -74,7 +74,7 @@ BOOST_AUTO_TEST_CASE(DoS_banscore)
     connman->ClearBanned();
     mapArgs["-banscore"] = "111"; // because 11 is my favorite number
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, "", true);
+    CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 3, "", true);
     GetNodeSignals().InitializeNode(dummyNode1.GetId(), &dummyNode1);
     dummyNode1.nVersion = 1;
     Misbehaving(dummyNode1.GetId(), 100);
@@ -96,7 +96,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
     SetMockTime(nStartTime); // Overrides future calls to GetTime()
 
     CAddress addr(ip(0xa0b0c001), NODE_NONE);
-    CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, "", true);
+    CNode dummyNode(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr, 4, "", true);
     GetNodeSignals().InitializeNode(dummyNode.GetId(), &dummyNode);
     dummyNode.nVersion = 1;
 

src/test/net_tests.cpp

@@ -164,12 +164,12 @@ BOOST_AUTO_TEST_CASE(cnode_simple_test)
     bool fInboundIn = false;
 
     // Test that fFeeler is false by default.
-    CNode* pnode1 = new CNode(id++, NODE_NETWORK, height, hSocket, addr, pszDest, fInboundIn);
+    CNode* pnode1 = new CNode(id++, NODE_NETWORK, height, hSocket, addr, 0, pszDest, fInboundIn);
     BOOST_CHECK(pnode1->fInbound == false);
     BOOST_CHECK(pnode1->fFeeler == false);
 
     fInboundIn = true;
-    CNode* pnode2 = new CNode(id++, NODE_NETWORK, height, hSocket, addr, pszDest, fInboundIn);
+    CNode* pnode2 = new CNode(id++, NODE_NETWORK, height, hSocket, addr, 1, pszDest, fInboundIn);
     BOOST_CHECK(pnode2->fInbound == true);
     BOOST_CHECK(pnode2->fFeeler == false);
 }

src/test/test_bitcoin.cpp

@@ -72,7 +72,7 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
         nScriptCheckThreads = 3;
         for (int i=0; i < nScriptCheckThreads-1; i++)
             threadGroup.create_thread(&ThreadScriptCheck);
-        g_connman = std::unique_ptr<CConnman>(new CConnman());
+        g_connman = std::unique_ptr<CConnman>(new CConnman(0x1337, 0x1337)); // Deterministic randomness for tests.
         connman = g_connman.get();
         RegisterNodeSignals(GetNodeSignals());
 }