diff options
| author | sirius-m <sirius-m@1a98c847-1fd6-4fd8-948a-caf3550aa51b> | 2009-08-30 03:46:39 +0000 |
|---|---|---|
| committer | sirius-m <sirius-m@1a98c847-1fd6-4fd8-948a-caf3550aa51b> | 2009-08-30 03:46:39 +0000 |
| commit | e071a3f6c06f41068ad17134189a4ac3073ef76b (patch) | |
| tree | 1e8dec58f70505a3dd554918ce9b07384d047415 /net.h | |
| download | bitcoin-e071a3f6c06f41068ad17134189a4ac3073ef76b.tar.xz | |
First commit
git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@1 1a98c847-1fd6-4fd8-948a-caf3550aa51b
Diffstat (limited to 'net.h')
| -rw-r--r-- | net.h | 856 |
1 files changed, 856 insertions, 0 deletions
@@ -0,0 +1,856 @@ +// Copyright (c) 2009 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+class CMessageHeader;
+class CAddress;
+class CInv;
+class CRequestTracker;
+class CNode;
+
+
+
+static const unsigned short DEFAULT_PORT = htons(8333);
+static const unsigned int PUBLISH_HOPS = 5;
+enum
+{
+ NODE_NETWORK = (1 << 0),
+};
+
+
+
+
+
+
+bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet);
+bool GetMyExternalIP(unsigned int& ipRet);
+bool AddAddress(CAddrDB& addrdb, const CAddress& addr);
+CNode* FindNode(unsigned int ip);
+CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
+void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
+bool AnySubscribed(unsigned int nChannel);
+void ThreadBitcoinMiner(void* parg);
+bool StartNode(string& strError=REF(string()));
+bool StopNode();
+void CheckForShutdown(int n);
+
+
+
+
+
+
+
+
+
+//
+// Message header
+// (4) message start
+// (12) command
+// (4) size
+
+// The message start string is designed to be unlikely to occur in normal data.
+// The characters are rarely used upper ascii, not valid as UTF-8, and produce
+// a large 4-byte int at any alignment.
+static const char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
+
+class CMessageHeader
+{
+public:
+ enum { COMMAND_SIZE=12 };
+ char pchMessageStart[sizeof(::pchMessageStart)];
+ char pchCommand[COMMAND_SIZE];
+ unsigned int nMessageSize;
+
+ CMessageHeader()
+ {
+ memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
+ memset(pchCommand, 0, sizeof(pchCommand));
+ pchCommand[1] = 1;
+ nMessageSize = -1;
+ }
+
+ CMessageHeader(const char* pszCommand, unsigned int nMessageSizeIn)
+ {
+ memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart));
+ strncpy(pchCommand, pszCommand, COMMAND_SIZE);
+ nMessageSize = nMessageSizeIn;
+ }
+
+ IMPLEMENT_SERIALIZE
+ (
+ READWRITE(FLATDATA(pchMessageStart));
+ READWRITE(FLATDATA(pchCommand));
+ READWRITE(nMessageSize);
+ )
+
+ string GetCommand()
+ {
+ if (pchCommand[COMMAND_SIZE-1] == 0)
+ return string(pchCommand, pchCommand + strlen(pchCommand));
+ else
+ return string(pchCommand, pchCommand + COMMAND_SIZE);
+ }
+
+ bool IsValid()
+ {
+ // Check start string
+ if (memcmp(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)) != 0)
+ return false;
+
+ // Check the command string for errors
+ for (char* p1 = pchCommand; p1 < pchCommand + COMMAND_SIZE; p1++)
+ {
+ if (*p1 == 0)
+ {
+ // Must be all zeros after the first zero
+ for (; p1 < pchCommand + COMMAND_SIZE; p1++)
+ if (*p1 != 0)
+ return false;
+ }
+ else if (*p1 < ' ' || *p1 > 0x7E)
+ return false;
+ }
+
+ // Message size
+ if (nMessageSize > 0x10000000)
+ {
+ printf("CMessageHeader::IsValid() : nMessageSize too large %u\n", nMessageSize);
+ return false;
+ }
+
+ return true;
+ }
+};
+
+
+
+
+
+
+static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
+
+class CAddress
+{
+public:
+ uint64 nServices;
+ unsigned char pchReserved[12];
+ unsigned int ip;
+ unsigned short port;
+
+ // disk only
+ unsigned int nTime;
+
+ // memory only
+ unsigned int nLastFailed;
+
+ CAddress()
+ {
+ nServices = 0;
+ memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
+ ip = 0;
+ port = DEFAULT_PORT;
+ nTime = GetAdjustedTime();
+ nLastFailed = 0;
+ }
+
+ CAddress(unsigned int ipIn, unsigned short portIn=DEFAULT_PORT, uint64 nServicesIn=0)
+ {
+ nServices = nServicesIn;
+ memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
+ ip = ipIn;
+ port = portIn;
+ nTime = GetAdjustedTime();
+ nLastFailed = 0;
+ }
+
+ explicit CAddress(const struct sockaddr_in& sockaddr, uint64 nServicesIn=0)
+ {
+ nServices = nServicesIn;
+ memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
+ ip = sockaddr.sin_addr.s_addr;
+ port = sockaddr.sin_port;
+ nTime = GetAdjustedTime();
+ nLastFailed = 0;
+ }
+
+ explicit CAddress(const char* pszIn, uint64 nServicesIn=0)
+ {
+ nServices = nServicesIn;
+ memcpy(pchReserved, pchIPv4, sizeof(pchReserved));
+ ip = 0;
+ port = DEFAULT_PORT;
+ nTime = GetAdjustedTime();
+ nLastFailed = 0;
+
+ char psz[100];
+ if (strlen(pszIn) > ARRAYLEN(psz)-1)
+ return;
+ strcpy(psz, pszIn);
+ unsigned int a, b, c, d, e;
+ if (sscanf(psz, "%u.%u.%u.%u:%u", &a, &b, &c, &d, &e) < 4)
+ return;
+ char* pszPort = strchr(psz, ':');
+ if (pszPort)
+ {
+ *pszPort++ = '\0';
+ port = htons(atoi(pszPort));
+ }
+ ip = inet_addr(psz);
+ }
+
+ IMPLEMENT_SERIALIZE
+ (
+ if (nType & SER_DISK)
+ {
+ READWRITE(nVersion);
+ READWRITE(nTime);
+ }
+ READWRITE(nServices);
+ READWRITE(FLATDATA(pchReserved));
+ READWRITE(ip);
+ READWRITE(port);
+ )
+
+ friend inline bool operator==(const CAddress& a, const CAddress& b)
+ {
+ return (memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved)) == 0 &&
+ a.ip == b.ip &&
+ a.port == b.port);
+ }
+
+ friend inline bool operator<(const CAddress& a, const CAddress& b)
+ {
+ int ret = memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved));
+ if (ret < 0)
+ return true;
+ else if (ret == 0)
+ {
+ if (ntohl(a.ip) < ntohl(b.ip))
+ return true;
+ else if (a.ip == b.ip)
+ return ntohs(a.port) < ntohs(b.port);
+ }
+ return false;
+ }
+
+ vector<unsigned char> GetKey() const
+ {
+ CDataStream ss;
+ ss.reserve(18);
+ ss << FLATDATA(pchReserved) << ip << port;
+
+ #if defined(_MSC_VER) && _MSC_VER < 1300
+ return vector<unsigned char>((unsigned char*)&ss.begin()[0], (unsigned char*)&ss.end()[0]);
+ #else
+ return vector<unsigned char>(ss.begin(), ss.end());
+ #endif
+ }
+
+ struct sockaddr_in GetSockAddr() const
+ {
+ struct sockaddr_in sockaddr;
+ sockaddr.sin_family = AF_INET;
+ sockaddr.sin_addr.s_addr = ip;
+ sockaddr.sin_port = port;
+ return sockaddr;
+ }
+
+ bool IsIPv4() const
+ {
+ return (memcmp(pchReserved, pchIPv4, sizeof(pchIPv4)) == 0);
+ }
+
+ bool IsRoutable() const
+ {
+ return !(GetByte(3) == 10 || (GetByte(3) == 192 && GetByte(2) == 168) || GetByte(3) == 127 || GetByte(3) == 0);
+ }
+
+ unsigned char GetByte(int n) const
+ {
+ return ((unsigned char*)&ip)[3-n];
+ }
+
+ string ToStringIPPort() const
+ {
+ return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
+ }
+
+ string ToStringIP() const
+ {
+ return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
+ }
+
+ string ToString() const
+ {
+ return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port));
+ //return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));
+ }
+
+ void print() const
+ {
+ printf("CAddress(%s)\n", ToString().c_str());
+ }
+};
+
+
+
+
+
+
+
+enum
+{
+ MSG_TX = 1,
+ MSG_BLOCK,
+ MSG_REVIEW,
+ MSG_PRODUCT,
+ MSG_TABLE,
+};
+
+static const char* ppszTypeName[] =
+{
+ "ERROR",
+ "tx",
+ "block",
+ "review",
+ "product",
+ "table",
+};
+
+class CInv
+{
+public:
+ int type;
+ uint256 hash;
+
+ CInv()
+ {
+ type = 0;
+ hash = 0;
+ }
+
+ CInv(int typeIn, const uint256& hashIn)
+ {
+ type = typeIn;
+ hash = hashIn;
+ }
+
+ CInv(const string& strType, const uint256& hashIn)
+ {
+ int i;
+ for (i = 1; i < ARRAYLEN(ppszTypeName); i++)
+ {
+ if (strType == ppszTypeName[i])
+ {
+ type = i;
+ break;
+ }
+ }
+ if (i == ARRAYLEN(ppszTypeName))
+ throw std::out_of_range(strprintf("CInv::CInv(string, uint256) : unknown type '%s'", strType.c_str()));
+ hash = hashIn;
+ }
+
+ IMPLEMENT_SERIALIZE
+ (
+ READWRITE(type);
+ READWRITE(hash);
+ )
+
+ friend inline bool operator<(const CInv& a, const CInv& b)
+ {
+ return (a.type < b.type || (a.type == b.type && a.hash < b.hash));
+ }
+
+ bool IsKnownType() const
+ {
+ return (type >= 1 && type < ARRAYLEN(ppszTypeName));
+ }
+
+ const char* GetCommand() const
+ {
+ if (!IsKnownType())
+ throw std::out_of_range(strprintf("CInv::GetCommand() : type=% unknown type", type));
+ return ppszTypeName[type];
+ }
+
+ string ToString() const
+ {
+ return strprintf("%s %s", GetCommand(), hash.ToString().substr(0,14).c_str());
+ }
+
+ void print() const
+ {
+ printf("CInv(%s)\n", ToString().c_str());
+ }
+};
+
+
+
+
+
+class CRequestTracker
+{
+public:
+ void (*fn)(void*, CDataStream&);
+ void* param1;
+
+ explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
+ {
+ fn = fnIn;
+ param1 = param1In;
+ }
+
+ bool IsNull()
+ {
+ return fn == NULL;
+ }
+};
+
+
+
+
+
+extern bool fClient;
+extern uint64 nLocalServices;
+extern CAddress addrLocalHost;
+extern CNode* pnodeLocalHost;
+extern bool fShutdown;
+extern array<bool, 10> vfThreadRunning;
+extern vector<CNode*> vNodes;
+extern CCriticalSection cs_vNodes;
+extern map<vector<unsigned char>, CAddress> mapAddresses;
+extern CCriticalSection cs_mapAddresses;
+extern map<CInv, CDataStream> mapRelay;
+extern deque<pair<int64, CInv> > vRelayExpiration;
+extern CCriticalSection cs_mapRelay;
+extern map<CInv, int64> mapAlreadyAskedFor;
+extern CAddress addrProxy;
+
+
+
+
+
+class CNode
+{
+public:
+ // socket
+ uint64 nServices;
+ SOCKET hSocket;
+ CDataStream vSend;
+ CDataStream vRecv;
+ CCriticalSection cs_vSend;
+ CCriticalSection cs_vRecv;
+ unsigned int nPushPos;
+ CAddress addr;
+ int nVersion;
+ bool fClient;
+ bool fInbound;
+ bool fNetworkNode;
+ bool fDisconnect;
+protected:
+ int nRefCount;
+public:
+ int64 nReleaseTime;
+ map<uint256, CRequestTracker> mapRequests;
+ CCriticalSection cs_mapRequests;
+
+ // flood
+ vector<CAddress> vAddrToSend;
+ set<CAddress> setAddrKnown;
+
+ // inventory based relay
+ set<CInv> setInventoryKnown;
+ set<CInv> setInventoryKnown2;
+ vector<CInv> vInventoryToSend;
+ CCriticalSection cs_inventory;
+ multimap<int64, CInv> mapAskFor;
+
+ // publish and subscription
+ vector<char> vfSubscribe;
+
+
+ CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
+ {
+ nServices = 0;
+ hSocket = hSocketIn;
+ vSend.SetType(SER_NETWORK);
+ vRecv.SetType(SER_NETWORK);
+ nPushPos = -1;
+ addr = addrIn;
+ nVersion = 0;
+ fClient = false; // set by version message
+ fInbound = fInboundIn;
+ fNetworkNode = false;
+ fDisconnect = false;
+ nRefCount = 0;
+ nReleaseTime = 0;
+ vfSubscribe.assign(256, false);
+
+ // Push a version message
+ /// when NTP implemented, change to just nTime = GetAdjustedTime()
+ int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
+ PushMessage("version", VERSION, nLocalServices, nTime, addr);
+ }
+
+ ~CNode()
+ {
+ if (hSocket != INVALID_SOCKET)
+ closesocket(hSocket);
+ }
+
+private:
+ CNode(const CNode&);
+ void operator=(const CNode&);
+public:
+
+
+ bool ReadyToDisconnect()
+ {
+ return fDisconnect || GetRefCount() <= 0;
+ }
+
+ int GetRefCount()
+ {
+ return max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
+ }
+
+ void AddRef(int64 nTimeout=0)
+ {
+ if (nTimeout != 0)
+ nReleaseTime = max(nReleaseTime, GetTime() + nTimeout);
+ else
+ nRefCount++;
+ }
+
+ void Release()
+ {
+ nRefCount--;
+ }
+
+
+
+ void AddInventoryKnown(const CInv& inv)
+ {
+ CRITICAL_BLOCK(cs_inventory)
+ setInventoryKnown.insert(inv);
+ }
+
+ void PushInventory(const CInv& inv)
+ {
+ CRITICAL_BLOCK(cs_inventory)
+ if (!setInventoryKnown.count(inv))
+ vInventoryToSend.push_back(inv);
+ }
+
+ void AskFor(const CInv& inv)
+ {
+ // We're using mapAskFor as a priority queue,
+ // the key is the earliest time the request can be sent
+ int64& nRequestTime = mapAlreadyAskedFor[inv];
+ printf("askfor %s %I64d\n", inv.ToString().c_str(), nRequestTime);
+
+ // Make sure not to reuse time indexes to keep things in the same order
+ int64 nNow = (GetTime() - 1) * 1000000;
+ static int64 nLastTime;
+ nLastTime = nNow = max(nNow, ++nLastTime);
+
+ // Each retry is 2 minutes after the last
+ nRequestTime = max(nRequestTime + 2 * 60 * 1000000, nNow);
+ mapAskFor.insert(make_pair(nRequestTime, inv));
+ }
+
+
+
+ void BeginMessage(const char* pszCommand)
+ {
+ EnterCriticalSection(&cs_vSend);
+ if (nPushPos != -1)
+ AbortMessage();
+ nPushPos = vSend.size();
+ vSend << CMessageHeader(pszCommand, 0);
+ printf("sending: %-12s ", pszCommand);
+ }
+
+ void AbortMessage()
+ {
+ if (nPushPos == -1)
+ return;
+ vSend.resize(nPushPos);
+ nPushPos = -1;
+ LeaveCriticalSection(&cs_vSend);
+ printf("(aborted)\n");
+ }
+
+ void EndMessage()
+ {
+ extern int nDropMessagesTest;
+ if (nDropMessagesTest > 0 && GetRand(nDropMessagesTest) == 0)
+ {
+ printf("dropmessages DROPPING SEND MESSAGE\n");
+ AbortMessage();
+ return;
+ }
+
+ if (nPushPos == -1)
+ return;
+
+ // Patch in the size
+ unsigned int nSize = vSend.size() - nPushPos - sizeof(CMessageHeader);
+ memcpy((char*)&vSend[nPushPos] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
+
+ printf("(%d bytes) ", nSize);
+ //for (int i = nPushPos+sizeof(CMessageHeader); i < min(vSend.size(), nPushPos+sizeof(CMessageHeader)+20U); i++)
+ // printf("%02x ", vSend[i] & 0xff);
+ printf("\n");
+
+ nPushPos = -1;
+ LeaveCriticalSection(&cs_vSend);
+ }
+
+ void EndMessageAbortIfEmpty()
+ {
+ if (nPushPos == -1)
+ return;
+ int nSize = vSend.size() - nPushPos - sizeof(CMessageHeader);
+ if (nSize > 0)
+ EndMessage();
+ else
+ AbortMessage();
+ }
+
+ const char* GetMessageCommand() const
+ {
+ if (nPushPos == -1)
+ return "";
+ return &vSend[nPushPos] + offsetof(CMessageHeader, pchCommand);
+ }
+
+
+
+
+ void PushMessage(const char* pszCommand)
+ {
+ try
+ {
+ BeginMessage(pszCommand);
+ EndMessage();
+ }
+ catch (...)
+ {
+ AbortMessage();
+ throw;
+ }
+ }
+
+ template<typename T1>
+ void PushMessage(const char* pszCommand, const T1& a1)
+ {
+ try
+ {
+ BeginMessage(pszCommand);
+ vSend << a1;
+ EndMessage();
+ }
+ catch (...)
+ {
+ AbortMessage();
+ throw;
+ }
+ }
+
+ template<typename T1, typename T2>
+ void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
+ {
+ try
+ {
+ BeginMessage(pszCommand);
+ vSend << a1 << a2;
+ EndMessage();
+ }
+ catch (...)
+ {
+ AbortMessage();
+ throw;
+ }
+ }
+
+ template<typename T1, typename T2, typename T3>
+ void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
+ {
+ try
+ {
+ BeginMessage(pszCommand);
+ vSend << a1 << a2 << a3;
+ EndMessage();
+ }
+ catch (...)
+ {
+ AbortMessage();
+ throw;
+ }
+ }
+
+ template<typename T1, typename T2, typename T3, typename T4>
+ void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
+ {
+ try
+ {
+ BeginMessage(pszCommand);
+ vSend << a1 << a2 << a3 << a4;
+ EndMessage();
+ }
+ catch (...)
+ {
+ AbortMessage();
+ throw;
+ }
+ }
+
+
+ void PushRequest(const char* pszCommand,
+ void (*fn)(void*, CDataStream&), void* param1)
+ {
+ uint256 hashReply;
+ RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
+
+ CRITICAL_BLOCK(cs_mapRequests)
+ mapRequests[hashReply] = CRequestTracker(fn, param1);
+
+ PushMessage(pszCommand, hashReply);
+ }
+
+ template<typename T1>
+ void PushRequest(const char* pszCommand, const T1& a1,
+ void (*fn)(void*, CDataStream&), void* param1)
+ {
+ uint256 hashReply;
+ RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
+
+ CRITICAL_BLOCK(cs_mapRequests)
+ mapRequests[hashReply] = CRequestTracker(fn, param1);
+
+ PushMessage(pszCommand, hashReply, a1);
+ }
+
+ template<typename T1, typename T2>
+ void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
+ void (*fn)(void*, CDataStream&), void* param1)
+ {
+ uint256 hashReply;
+ RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
+
+ CRITICAL_BLOCK(cs_mapRequests)
+ mapRequests[hashReply] = CRequestTracker(fn, param1);
+
+ PushMessage(pszCommand, hashReply, a1, a2);
+ }
+
+
+
+ bool IsSubscribed(unsigned int nChannel);
+ void Subscribe(unsigned int nChannel, unsigned int nHops=0);
+ void CancelSubscribe(unsigned int nChannel);
+ void Disconnect();
+};
+
+
+
+
+
+
+
+
+
+
+inline void RelayInventory(const CInv& inv)
+{
+ // Put on lists to offer to the other nodes
+ CRITICAL_BLOCK(cs_vNodes)
+ foreach(CNode* pnode, vNodes)
+ pnode->PushInventory(inv);
+}
+
+template<typename T>
+void RelayMessage(const CInv& inv, const T& a)
+{
+ CDataStream ss(SER_NETWORK);
+ ss.reserve(10000);
+ ss << a;
+ RelayMessage(inv, ss);
+}
+
+template<>
+inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
+{
+ CRITICAL_BLOCK(cs_mapRelay)
+ {
+ // Expire old relay messages
+ while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
+ {
+ mapRelay.erase(vRelayExpiration.front().second);
+ vRelayExpiration.pop_front();
+ }
+
+ // Save original serialized message so newer versions are preserved
+ mapRelay[inv] = ss;
+ vRelayExpiration.push_back(make_pair(GetTime() + 15 * 60, inv));
+ }
+
+ RelayInventory(inv);
+}
+
+
+
+
+
+
+
+
+//
+// Templates for the publish and subscription system.
+// The object being published as T& obj needs to have:
+// a set<unsigned int> setSources member
+// specializations of AdvertInsert and AdvertErase
+// Currently implemented for CTable and CProduct.
+//
+
+template<typename T>
+void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
+{
+ // Add to sources
+ obj.setSources.insert(pfrom->addr.ip);
+
+ if (!AdvertInsert(obj))
+ return;
+
+ // Relay
+ CRITICAL_BLOCK(cs_vNodes)
+ foreach(CNode* pnode, vNodes)
+ if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
+ pnode->PushMessage("publish", nChannel, nHops, obj);
+}
+
+template<typename T>
+void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
+{
+ uint256 hash = obj.GetHash();
+
+ CRITICAL_BLOCK(cs_vNodes)
+ foreach(CNode* pnode, vNodes)
+ if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
+ pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
+
+ AdvertErase(obj);
+}
+
+template<typename T>
+void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
+{
+ // Remove a source
+ obj.setSources.erase(pfrom->addr.ip);
+
+ // If no longer supported by any sources, cancel it
+ if (obj.setSources.empty())
+ AdvertStopPublish(pfrom, nChannel, nHops, obj);
+}
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