aboutsummaryrefslogtreecommitdiff
path: root/src/net.h
blob: 21a2919f4a8308dcbb7de88f766ba61168623c55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_NET_H
#define BITCOIN_NET_H

#include "bloom.h"
#include "compat.h"
#include "hash.h"
#include "limitedmap.h"
#include "mruset.h"
#include "netbase.h"
#include "protocol.h"
#include "random.h"
#include "sync.h"
#include "uint256.h"
#include "util.h"

#include <deque>
#include <stdint.h>

#ifndef WIN32
#include <arpa/inet.h>
#endif

#include <boost/foreach.hpp>
#include <boost/signals2/signal.hpp>

class CAddrMan;
class CBlockIndex;
class CNode;

namespace boost {
    class thread_group;
} // namespace boost

/** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
static const int PING_INTERVAL = 2 * 60;
/** Time after which to disconnect, after waiting for a ping response (or inactivity). */
static const int TIMEOUT_INTERVAL = 20 * 60;
/** The maximum number of entries in an 'inv' protocol message */
static const unsigned int MAX_INV_SZ = 50000;
/** -listen default */
static const bool DEFAULT_LISTEN = true;
/** -upnp default */
#ifdef USE_UPNP
static const bool DEFAULT_UPNP = USE_UPNP;
#else
static const bool DEFAULT_UPNP = false;
#endif

inline unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }

void AddOneShot(std::string strDest);
bool RecvLine(SOCKET hSocket, std::string& strLine);
bool GetMyExternalIP(CNetAddr& ipRet);
void AddressCurrentlyConnected(const CService& addr);
CNode* FindNode(const CNetAddr& ip);
CNode* FindNode(const CService& ip);
CNode* ConnectNode(CAddress addrConnect, const char *pszDest = NULL);
bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
void MapPort(bool fUseUPnP);
unsigned short GetListenPort();
bool BindListenPort(const CService &bindAddr, std::string& strError);
void StartNode(boost::thread_group& threadGroup);
bool StopNode();
void SocketSendData(CNode *pnode);

typedef int NodeId;

// Signals for message handling
struct CNodeSignals
{
    boost::signals2::signal<int ()> GetHeight;
    boost::signals2::signal<bool (CNode*)> ProcessMessages;
    boost::signals2::signal<bool (CNode*, bool)> SendMessages;
    boost::signals2::signal<void (NodeId, const CNode*)> InitializeNode;
    boost::signals2::signal<void (NodeId)> FinalizeNode;
};


CNodeSignals& GetNodeSignals();


enum
{
    LOCAL_NONE,   // unknown
    LOCAL_IF,     // address a local interface listens on
    LOCAL_BIND,   // address explicit bound to
    LOCAL_UPNP,   // address reported by UPnP
    LOCAL_HTTP,   // address reported by whatismyip.com and similar
    LOCAL_MANUAL, // address explicitly specified (-externalip=)

    LOCAL_MAX
};

void SetLimited(enum Network net, bool fLimited = true);
bool IsLimited(enum Network net);
bool IsLimited(const CNetAddr& addr);
bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
bool SeenLocal(const CService& addr);
bool IsLocal(const CService& addr);
bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
bool IsReachable(const CNetAddr &addr);
void SetReachable(enum Network net, bool fFlag = true);
CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);


extern bool fDiscover;
extern bool fListen;
extern uint64_t nLocalServices;
extern uint64_t nLocalHostNonce;
extern CAddrMan addrman;
extern int nMaxConnections;

extern std::vector<CNode*> vNodes;
extern CCriticalSection cs_vNodes;
extern std::map<CInv, CDataStream> mapRelay;
extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
extern CCriticalSection cs_mapRelay;
extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;

extern std::vector<std::string> vAddedNodes;
extern CCriticalSection cs_vAddedNodes;

extern NodeId nLastNodeId;
extern CCriticalSection cs_nLastNodeId;

struct LocalServiceInfo {
    int nScore;
    int nPort;
};

extern CCriticalSection cs_mapLocalHost;
extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;

class CNodeStats
{
public:
    NodeId nodeid;
    uint64_t nServices;
    int64_t nLastSend;
    int64_t nLastRecv;
    int64_t nTimeConnected;
    std::string addrName;
    int nVersion;
    std::string cleanSubVer;
    bool fInbound;
    int nStartingHeight;
    uint64_t nSendBytes;
    uint64_t nRecvBytes;
    bool fSyncNode;
    double dPingTime;
    double dPingWait;
    std::string addrLocal;
};




class CNetMessage {
public:
    bool in_data;                   // parsing header (false) or data (true)

    CDataStream hdrbuf;             // partially received header
    CMessageHeader hdr;             // complete header
    unsigned int nHdrPos;

    CDataStream vRecv;              // received message data
    unsigned int nDataPos;

    int64_t nTime;                  // time (in microseconds) of message receipt.

    CNetMessage(int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), vRecv(nTypeIn, nVersionIn) {
        hdrbuf.resize(24);
        in_data = false;
        nHdrPos = 0;
        nDataPos = 0;
        nTime = 0;
    }

    bool complete() const
    {
        if (!in_data)
            return false;
        return (hdr.nMessageSize == nDataPos);
    }

    void SetVersion(int nVersionIn)
    {
        hdrbuf.SetVersion(nVersionIn);
        vRecv.SetVersion(nVersionIn);
    }

    int readHeader(const char *pch, unsigned int nBytes);
    int readData(const char *pch, unsigned int nBytes);
};





/** Information about a peer */
class CNode
{
public:
    // socket
    uint64_t nServices;
    SOCKET hSocket;
    CDataStream ssSend;
    size_t nSendSize; // total size of all vSendMsg entries
    size_t nSendOffset; // offset inside the first vSendMsg already sent
    uint64_t nSendBytes;
    std::deque<CSerializeData> vSendMsg;
    CCriticalSection cs_vSend;

    std::deque<CInv> vRecvGetData;
    std::deque<CNetMessage> vRecvMsg;
    CCriticalSection cs_vRecvMsg;
    uint64_t nRecvBytes;
    int nRecvVersion;

    int64_t nLastSend;
    int64_t nLastRecv;
    int64_t nTimeConnected;
    CAddress addr;
    std::string addrName;
    CService addrLocal;
    int nVersion;
    // strSubVer is whatever byte array we read from the wire. However, this field is intended
    // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
    // store the sanitized version in cleanSubVer. The original should be used when dealing with
    // the network or wire types and the cleaned string used when displayed or logged.
    std::string strSubVer, cleanSubVer;
    bool fOneShot;
    bool fClient;
    bool fInbound;
    bool fNetworkNode;
    bool fSuccessfullyConnected;
    bool fDisconnect;
    // We use fRelayTxes for two purposes -
    // a) it allows us to not relay tx invs before receiving the peer's version message
    // b) the peer may tell us in their version message that we should not relay tx invs
    //    until they have initialized their bloom filter.
    bool fRelayTxes;
    CSemaphoreGrant grantOutbound;
    CCriticalSection cs_filter;
    CBloomFilter* pfilter;
    int nRefCount;
    NodeId id;
protected:

    // Denial-of-service detection/prevention
    // Key is IP address, value is banned-until-time
    static std::map<CNetAddr, int64_t> setBanned;
    static CCriticalSection cs_setBanned;

    // Basic fuzz-testing
    void Fuzz(int nChance); // modifies ssSend

public:
    uint256 hashContinue;
    CBlockIndex* pindexLastGetBlocksBegin;
    uint256 hashLastGetBlocksEnd;
    int nStartingHeight;
    bool fStartSync;

    // flood relay
    std::vector<CAddress> vAddrToSend;
    mruset<CAddress> setAddrKnown;
    bool fGetAddr;
    std::set<uint256> setKnown;

    // inventory based relay
    mruset<CInv> setInventoryKnown;
    std::vector<CInv> vInventoryToSend;
    CCriticalSection cs_inventory;
    std::multimap<int64_t, CInv> mapAskFor;

    // Ping time measurement:
    // The pong reply we're expecting, or 0 if no pong expected.
    uint64_t nPingNonceSent;
    // Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
    int64_t nPingUsecStart;
    // Last measured round-trip time.
    int64_t nPingUsecTime;
    // Whether a ping is requested.
    bool fPingQueued;

    CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : ssSend(SER_NETWORK, INIT_PROTO_VERSION), setAddrKnown(5000)
    {
        nServices = 0;
        hSocket = hSocketIn;
        nRecvVersion = INIT_PROTO_VERSION;
        nLastSend = 0;
        nLastRecv = 0;
        nSendBytes = 0;
        nRecvBytes = 0;
        nTimeConnected = GetTime();
        addr = addrIn;
        addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
        nVersion = 0;
        strSubVer = "";
        fOneShot = false;
        fClient = false; // set by version message
        fInbound = fInboundIn;
        fNetworkNode = false;
        fSuccessfullyConnected = false;
        fDisconnect = false;
        nRefCount = 0;
        nSendSize = 0;
        nSendOffset = 0;
        hashContinue = 0;
        pindexLastGetBlocksBegin = 0;
        hashLastGetBlocksEnd = 0;
        nStartingHeight = -1;
        fStartSync = false;
        fGetAddr = false;
        fRelayTxes = false;
        setInventoryKnown.max_size(SendBufferSize() / 1000);
        pfilter = new CBloomFilter();
        nPingNonceSent = 0;
        nPingUsecStart = 0;
        nPingUsecTime = 0;
        fPingQueued = false;

        {
            LOCK(cs_nLastNodeId);
            id = nLastNodeId++;
        }

        if (fLogIPs)
            LogPrint("net", "Added connection to %s peer=%d\n", addrName, id);
        else
            LogPrint("net", "Added connection peer=%d\n", id);

        // Be shy and don't send version until we hear
        if (hSocket != INVALID_SOCKET && !fInbound)
            PushVersion();

        GetNodeSignals().InitializeNode(GetId(), this);
    }

    ~CNode()
    {
        if (hSocket != INVALID_SOCKET)
        {
            closesocket(hSocket);
            hSocket = INVALID_SOCKET;
        }
        if (pfilter)
            delete pfilter;
        GetNodeSignals().FinalizeNode(GetId());
    }

private:
    // Network usage totals
    static CCriticalSection cs_totalBytesRecv;
    static CCriticalSection cs_totalBytesSent;
    static uint64_t nTotalBytesRecv;
    static uint64_t nTotalBytesSent;

    CNode(const CNode&);
    void operator=(const CNode&);

public:

    NodeId GetId() const {
      return id;
    }

    int GetRefCount()
    {
        assert(nRefCount >= 0);
        return nRefCount;
    }

    // requires LOCK(cs_vRecvMsg)
    unsigned int GetTotalRecvSize()
    {
        unsigned int total = 0;
        BOOST_FOREACH(const CNetMessage &msg, vRecvMsg)
            total += msg.vRecv.size() + 24;
        return total;
    }

    // requires LOCK(cs_vRecvMsg)
    bool ReceiveMsgBytes(const char *pch, unsigned int nBytes);

    // requires LOCK(cs_vRecvMsg)
    void SetRecvVersion(int nVersionIn)
    {
        nRecvVersion = nVersionIn;
        BOOST_FOREACH(CNetMessage &msg, vRecvMsg)
            msg.SetVersion(nVersionIn);
    }

    CNode* AddRef()
    {
        nRefCount++;
        return this;
    }

    void Release()
    {
        nRefCount--;
    }



    void AddAddressKnown(const CAddress& addr)
    {
        setAddrKnown.insert(addr);
    }

    void PushAddress(const CAddress& addr)
    {
        // Known checking here is only to save space from duplicates.
        // SendMessages will filter it again for knowns that were added
        // after addresses were pushed.
        if (addr.IsValid() && !setAddrKnown.count(addr))
            vAddrToSend.push_back(addr);
    }


    void AddInventoryKnown(const CInv& inv)
    {
        {
            LOCK(cs_inventory);
            setInventoryKnown.insert(inv);
        }
    }

    void PushInventory(const CInv& inv)
    {
        {
            LOCK(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_t nRequestTime;
        limitedmap<CInv, int64_t>::const_iterator it = mapAlreadyAskedFor.find(inv);
        if (it != mapAlreadyAskedFor.end())
            nRequestTime = it->second;
        else
            nRequestTime = 0;
        LogPrint("net", "askfor %s  %d (%s) peer=%d\n", inv.ToString(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000).c_str(), id);

        // Make sure not to reuse time indexes to keep things in the same order
        int64_t nNow = GetTimeMicros() - 1000000;
        static int64_t nLastTime;
        ++nLastTime;
        nNow = std::max(nNow, nLastTime);
        nLastTime = nNow;

        // Each retry is 2 minutes after the last
        nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
        if (it != mapAlreadyAskedFor.end())
            mapAlreadyAskedFor.update(it, nRequestTime);
        else
            mapAlreadyAskedFor.insert(std::make_pair(inv, nRequestTime));
        mapAskFor.insert(std::make_pair(nRequestTime, inv));
    }



    // TODO: Document the postcondition of this function.  Is cs_vSend locked?
    void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend)
    {
        ENTER_CRITICAL_SECTION(cs_vSend);
        assert(ssSend.size() == 0);
        ssSend << CMessageHeader(pszCommand, 0);
        LogPrint("net", "sending: %s ", pszCommand);
    }

    // TODO: Document the precondition of this function.  Is cs_vSend locked?
    void AbortMessage() UNLOCK_FUNCTION(cs_vSend)
    {
        ssSend.clear();

        LEAVE_CRITICAL_SECTION(cs_vSend);

        LogPrint("net", "(aborted)\n");
    }

    // TODO: Document the precondition of this function.  Is cs_vSend locked?
    void EndMessage() UNLOCK_FUNCTION(cs_vSend)
    {
        // The -*messagestest options are intentionally not documented in the help message,
        // since they are only used during development to debug the networking code and are
        // not intended for end-users.
        if (mapArgs.count("-dropmessagestest") && GetRand(GetArg("-dropmessagestest", 2)) == 0)
        {
            LogPrint("net", "dropmessages DROPPING SEND MESSAGE\n");
            AbortMessage();
            return;
        }
        if (mapArgs.count("-fuzzmessagestest"))
            Fuzz(GetArg("-fuzzmessagestest", 10));

        if (ssSend.size() == 0)
            return;

        // Set the size
        unsigned int nSize = ssSend.size() - CMessageHeader::HEADER_SIZE;
        memcpy((char*)&ssSend[CMessageHeader::MESSAGE_SIZE_OFFSET], &nSize, sizeof(nSize));

        // Set the checksum
        uint256 hash = Hash(ssSend.begin() + CMessageHeader::HEADER_SIZE, ssSend.end());
        unsigned int nChecksum = 0;
        memcpy(&nChecksum, &hash, sizeof(nChecksum));
        assert(ssSend.size () >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
        memcpy((char*)&ssSend[CMessageHeader::CHECKSUM_OFFSET], &nChecksum, sizeof(nChecksum));

        LogPrint("net", "(%d bytes) peer=%d\n", nSize, id);

        std::deque<CSerializeData>::iterator it = vSendMsg.insert(vSendMsg.end(), CSerializeData());
        ssSend.GetAndClear(*it);
        nSendSize += (*it).size();

        // If write queue empty, attempt "optimistic write"
        if (it == vSendMsg.begin())
            SocketSendData(this);

        LEAVE_CRITICAL_SECTION(cs_vSend);
    }

    void PushVersion();


    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);
            ssSend << a1;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << 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);
            ssSend << 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);
            ssSend << a1 << a2 << a3 << a4;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2, typename T3, typename T4, typename T5>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
    {
        try
        {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
            EndMessage();
        }
        catch (...)
        {
            AbortMessage();
            throw;
        }
    }

    bool IsSubscribed(unsigned int nChannel);
    void Subscribe(unsigned int nChannel, unsigned int nHops=0);
    void CancelSubscribe(unsigned int nChannel);
    void CloseSocketDisconnect();

    // Denial-of-service detection/prevention
    // The idea is to detect peers that are behaving
    // badly and disconnect/ban them, but do it in a
    // one-coding-mistake-won't-shatter-the-entire-network
    // way.
    // IMPORTANT:  There should be nothing I can give a
    // node that it will forward on that will make that
    // node's peers drop it. If there is, an attacker
    // can isolate a node and/or try to split the network.
    // Dropping a node for sending stuff that is invalid
    // now but might be valid in a later version is also
    // dangerous, because it can cause a network split
    // between nodes running old code and nodes running
    // new code.
    static void ClearBanned(); // needed for unit testing
    static bool IsBanned(CNetAddr ip);
    static bool Ban(const CNetAddr &ip);
    void copyStats(CNodeStats &stats);

    // Network stats
    static void RecordBytesRecv(uint64_t bytes);
    static void RecordBytesSent(uint64_t bytes);

    static uint64_t GetTotalBytesRecv();
    static uint64_t GetTotalBytesSent();
};



class CTransaction;
void RelayTransaction(const CTransaction& tx);
void RelayTransaction(const CTransaction& tx, const CDataStream& ss);

/** Access to the (IP) address database (peers.dat) */
class CAddrDB
{
private:
    boost::filesystem::path pathAddr;
public:
    CAddrDB();
    bool Write(const CAddrMan& addr);
    bool Read(CAddrMan& addr);
};

#endif