aboutsummaryrefslogtreecommitdiff
path: root/src/netbase.cpp
blob: 92ac1c4c85c66f64e5bf7eb7d0a3f347a5122f7f (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
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <netbase.h>

#include <hash.h>
#include <sync.h>
#include <uint256.h>
#include <random.h>
#include <util.h>
#include <utilstrencodings.h>

#include <atomic>

#ifndef WIN32
#include <fcntl.h>
#endif

#include <boost/algorithm/string/case_conv.hpp> // for to_lower()
#include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()

#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif

// Settings
static proxyType proxyInfo[NET_MAX];
static proxyType nameProxy;
static CCriticalSection cs_proxyInfos;
int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
bool fNameLookup = DEFAULT_NAME_LOOKUP;

// Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
static std::atomic<bool> interruptSocks5Recv(false);

enum Network ParseNetwork(std::string net) {
    boost::to_lower(net);
    if (net == "ipv4") return NET_IPV4;
    if (net == "ipv6") return NET_IPV6;
    if (net == "tor" || net == "onion")  return NET_TOR;
    return NET_UNROUTABLE;
}

std::string GetNetworkName(enum Network net) {
    switch(net)
    {
    case NET_IPV4: return "ipv4";
    case NET_IPV6: return "ipv6";
    case NET_TOR: return "onion";
    default: return "";
    }
}

bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
{
    vIP.clear();

    {
        CNetAddr addr;
        if (addr.SetSpecial(std::string(pszName))) {
            vIP.push_back(addr);
            return true;
        }
    }

    struct addrinfo aiHint;
    memset(&aiHint, 0, sizeof(struct addrinfo));

    aiHint.ai_socktype = SOCK_STREAM;
    aiHint.ai_protocol = IPPROTO_TCP;
    aiHint.ai_family = AF_UNSPEC;
#ifdef WIN32
    aiHint.ai_flags = fAllowLookup ? 0 : AI_NUMERICHOST;
#else
    aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
#endif
    struct addrinfo *aiRes = nullptr;
    int nErr = getaddrinfo(pszName, nullptr, &aiHint, &aiRes);
    if (nErr)
        return false;

    struct addrinfo *aiTrav = aiRes;
    while (aiTrav != nullptr && (nMaxSolutions == 0 || vIP.size() < nMaxSolutions))
    {
        CNetAddr resolved;
        if (aiTrav->ai_family == AF_INET)
        {
            assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in));
            resolved = CNetAddr(((struct sockaddr_in*)(aiTrav->ai_addr))->sin_addr);
        }

        if (aiTrav->ai_family == AF_INET6)
        {
            assert(aiTrav->ai_addrlen >= sizeof(sockaddr_in6));
            struct sockaddr_in6* s6 = (struct sockaddr_in6*) aiTrav->ai_addr;
            resolved = CNetAddr(s6->sin6_addr, s6->sin6_scope_id);
        }
        /* Never allow resolving to an internal address. Consider any such result invalid */
        if (!resolved.IsInternal()) {
            vIP.push_back(resolved);
        }

        aiTrav = aiTrav->ai_next;
    }

    freeaddrinfo(aiRes);

    return (vIP.size() > 0);
}

bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
{
    std::string strHost(pszName);
    if (strHost.empty())
        return false;
    if (boost::algorithm::starts_with(strHost, "[") && boost::algorithm::ends_with(strHost, "]"))
    {
        strHost = strHost.substr(1, strHost.size() - 2);
    }

    return LookupIntern(strHost.c_str(), vIP, nMaxSolutions, fAllowLookup);
}

bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup)
{
    std::vector<CNetAddr> vIP;
    LookupHost(pszName, vIP, 1, fAllowLookup);
    if(vIP.empty())
        return false;
    addr = vIP.front();
    return true;
}

bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions)
{
    if (pszName[0] == 0)
        return false;
    int port = portDefault;
    std::string hostname;
    SplitHostPort(std::string(pszName), port, hostname);

    std::vector<CNetAddr> vIP;
    bool fRet = LookupIntern(hostname.c_str(), vIP, nMaxSolutions, fAllowLookup);
    if (!fRet)
        return false;
    vAddr.resize(vIP.size());
    for (unsigned int i = 0; i < vIP.size(); i++)
        vAddr[i] = CService(vIP[i], port);
    return true;
}

bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup)
{
    std::vector<CService> vService;
    bool fRet = Lookup(pszName, vService, portDefault, fAllowLookup, 1);
    if (!fRet)
        return false;
    addr = vService[0];
    return true;
}

CService LookupNumeric(const char *pszName, int portDefault)
{
    CService addr;
    // "1.2:345" will fail to resolve the ip, but will still set the port.
    // If the ip fails to resolve, re-init the result.
    if(!Lookup(pszName, addr, portDefault, false))
        addr = CService();
    return addr;
}

struct timeval MillisToTimeval(int64_t nTimeout)
{
    struct timeval timeout;
    timeout.tv_sec  = nTimeout / 1000;
    timeout.tv_usec = (nTimeout % 1000) * 1000;
    return timeout;
}

/** SOCKS version */
enum SOCKSVersion: uint8_t {
    SOCKS4 = 0x04,
    SOCKS5 = 0x05
};

/** Values defined for METHOD in RFC1928 */
enum SOCKS5Method: uint8_t {
    NOAUTH = 0x00,        //! No authentication required
    GSSAPI = 0x01,        //! GSSAPI
    USER_PASS = 0x02,     //! Username/password
    NO_ACCEPTABLE = 0xff, //! No acceptable methods
};

/** Values defined for CMD in RFC1928 */
enum SOCKS5Command: uint8_t {
    CONNECT = 0x01,
    BIND = 0x02,
    UDP_ASSOCIATE = 0x03
};

/** Values defined for REP in RFC1928 */
enum SOCKS5Reply: uint8_t {
    SUCCEEDED = 0x00,        //! Succeeded
    GENFAILURE = 0x01,       //! General failure
    NOTALLOWED = 0x02,       //! Connection not allowed by ruleset
    NETUNREACHABLE = 0x03,   //! Network unreachable
    HOSTUNREACHABLE = 0x04,  //! Network unreachable
    CONNREFUSED = 0x05,      //! Connection refused
    TTLEXPIRED = 0x06,       //! TTL expired
    CMDUNSUPPORTED = 0x07,   //! Command not supported
    ATYPEUNSUPPORTED = 0x08, //! Address type not supported
};

/** Values defined for ATYPE in RFC1928 */
enum SOCKS5Atyp: uint8_t {
    IPV4 = 0x01,
    DOMAINNAME = 0x03,
    IPV6 = 0x04,
};

/** Status codes that can be returned by InterruptibleRecv */
enum class IntrRecvError {
    OK,
    Timeout,
    Disconnected,
    NetworkError,
    Interrupted
};

/**
 * Read bytes from socket. This will either read the full number of bytes requested
 * or return False on error or timeout.
 * This function can be interrupted by calling InterruptSocks5()
 *
 * @param data Buffer to receive into
 * @param len  Length of data to receive
 * @param timeout  Timeout in milliseconds for receive operation
 *
 * @note This function requires that hSocket is in non-blocking mode.
 */
static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const SOCKET& hSocket)
{
    int64_t curTime = GetTimeMillis();
    int64_t endTime = curTime + timeout;
    // Maximum time to wait in one select call. It will take up until this time (in millis)
    // to break off in case of an interruption.
    const int64_t maxWait = 1000;
    while (len > 0 && curTime < endTime) {
        ssize_t ret = recv(hSocket, (char*)data, len, 0); // Optimistically try the recv first
        if (ret > 0) {
            len -= ret;
            data += ret;
        } else if (ret == 0) { // Unexpected disconnection
            return IntrRecvError::Disconnected;
        } else { // Other error or blocking
            int nErr = WSAGetLastError();
            if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
                if (!IsSelectableSocket(hSocket)) {
                    return IntrRecvError::NetworkError;
                }
                struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
                fd_set fdset;
                FD_ZERO(&fdset);
                FD_SET(hSocket, &fdset);
                int nRet = select(hSocket + 1, &fdset, nullptr, nullptr, &tval);
                if (nRet == SOCKET_ERROR) {
                    return IntrRecvError::NetworkError;
                }
            } else {
                return IntrRecvError::NetworkError;
            }
        }
        if (interruptSocks5Recv)
            return IntrRecvError::Interrupted;
        curTime = GetTimeMillis();
    }
    return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout;
}

/** Credentials for proxy authentication */
struct ProxyCredentials
{
    std::string username;
    std::string password;
};

/** Convert SOCKS5 reply to an error message */
std::string Socks5ErrorString(uint8_t err)
{
    switch(err) {
        case SOCKS5Reply::GENFAILURE:
            return "general failure";
        case SOCKS5Reply::NOTALLOWED:
            return "connection not allowed";
        case SOCKS5Reply::NETUNREACHABLE:
            return "network unreachable";
        case SOCKS5Reply::HOSTUNREACHABLE:
            return "host unreachable";
        case SOCKS5Reply::CONNREFUSED:
            return "connection refused";
        case SOCKS5Reply::TTLEXPIRED:
            return "TTL expired";
        case SOCKS5Reply::CMDUNSUPPORTED:
            return "protocol error";
        case SOCKS5Reply::ATYPEUNSUPPORTED:
            return "address type not supported";
        default:
            return "unknown";
    }
}

/** Connect using SOCKS5 (as described in RFC1928) */
static bool Socks5(const std::string& strDest, int port, const ProxyCredentials *auth, const SOCKET& hSocket)
{
    IntrRecvError recvr;
    LogPrint(BCLog::NET, "SOCKS5 connecting %s\n", strDest);
    if (strDest.size() > 255) {
        return error("Hostname too long");
    }
    // Accepted authentication methods
    std::vector<uint8_t> vSocks5Init;
    vSocks5Init.push_back(SOCKSVersion::SOCKS5);
    if (auth) {
        vSocks5Init.push_back(0x02); // Number of methods
        vSocks5Init.push_back(SOCKS5Method::NOAUTH);
        vSocks5Init.push_back(SOCKS5Method::USER_PASS);
    } else {
        vSocks5Init.push_back(0x01); // Number of methods
        vSocks5Init.push_back(SOCKS5Method::NOAUTH);
    }
    ssize_t ret = send(hSocket, (const char*)vSocks5Init.data(), vSocks5Init.size(), MSG_NOSIGNAL);
    if (ret != (ssize_t)vSocks5Init.size()) {
        return error("Error sending to proxy");
    }
    uint8_t pchRet1[2];
    if ((recvr = InterruptibleRecv(pchRet1, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
        LogPrintf("Socks5() connect to %s:%d failed: InterruptibleRecv() timeout or other failure\n", strDest, port);
        return false;
    }
    if (pchRet1[0] != SOCKSVersion::SOCKS5) {
        return error("Proxy failed to initialize");
    }
    if (pchRet1[1] == SOCKS5Method::USER_PASS && auth) {
        // Perform username/password authentication (as described in RFC1929)
        std::vector<uint8_t> vAuth;
        vAuth.push_back(0x01); // Current (and only) version of user/pass subnegotiation
        if (auth->username.size() > 255 || auth->password.size() > 255)
            return error("Proxy username or password too long");
        vAuth.push_back(auth->username.size());
        vAuth.insert(vAuth.end(), auth->username.begin(), auth->username.end());
        vAuth.push_back(auth->password.size());
        vAuth.insert(vAuth.end(), auth->password.begin(), auth->password.end());
        ret = send(hSocket, (const char*)vAuth.data(), vAuth.size(), MSG_NOSIGNAL);
        if (ret != (ssize_t)vAuth.size()) {
            return error("Error sending authentication to proxy");
        }
        LogPrint(BCLog::PROXY, "SOCKS5 sending proxy authentication %s:%s\n", auth->username, auth->password);
        uint8_t pchRetA[2];
        if ((recvr = InterruptibleRecv(pchRetA, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
            return error("Error reading proxy authentication response");
        }
        if (pchRetA[0] != 0x01 || pchRetA[1] != 0x00) {
            return error("Proxy authentication unsuccessful");
        }
    } else if (pchRet1[1] == SOCKS5Method::NOAUTH) {
        // Perform no authentication
    } else {
        return error("Proxy requested wrong authentication method %02x", pchRet1[1]);
    }
    std::vector<uint8_t> vSocks5;
    vSocks5.push_back(SOCKSVersion::SOCKS5); // VER protocol version
    vSocks5.push_back(SOCKS5Command::CONNECT); // CMD CONNECT
    vSocks5.push_back(0x00); // RSV Reserved must be 0
    vSocks5.push_back(SOCKS5Atyp::DOMAINNAME); // ATYP DOMAINNAME
    vSocks5.push_back(strDest.size()); // Length<=255 is checked at beginning of function
    vSocks5.insert(vSocks5.end(), strDest.begin(), strDest.end());
    vSocks5.push_back((port >> 8) & 0xFF);
    vSocks5.push_back((port >> 0) & 0xFF);
    ret = send(hSocket, (const char*)vSocks5.data(), vSocks5.size(), MSG_NOSIGNAL);
    if (ret != (ssize_t)vSocks5.size()) {
        return error("Error sending to proxy");
    }
    uint8_t pchRet2[4];
    if ((recvr = InterruptibleRecv(pchRet2, 4, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
        if (recvr == IntrRecvError::Timeout) {
            /* If a timeout happens here, this effectively means we timed out while connecting
             * to the remote node. This is very common for Tor, so do not print an
             * error message. */
            return false;
        } else {
            return error("Error while reading proxy response");
        }
    }
    if (pchRet2[0] != SOCKSVersion::SOCKS5) {
        return error("Proxy failed to accept request");
    }
    if (pchRet2[1] != SOCKS5Reply::SUCCEEDED) {
        // Failures to connect to a peer that are not proxy errors
        LogPrintf("Socks5() connect to %s:%d failed: %s\n", strDest, port, Socks5ErrorString(pchRet2[1]));
        return false;
    }
    if (pchRet2[2] != 0x00) { // Reserved field must be 0
        return error("Error: malformed proxy response");
    }
    uint8_t pchRet3[256];
    switch (pchRet2[3])
    {
        case SOCKS5Atyp::IPV4: recvr = InterruptibleRecv(pchRet3, 4, SOCKS5_RECV_TIMEOUT, hSocket); break;
        case SOCKS5Atyp::IPV6: recvr = InterruptibleRecv(pchRet3, 16, SOCKS5_RECV_TIMEOUT, hSocket); break;
        case SOCKS5Atyp::DOMAINNAME:
        {
            recvr = InterruptibleRecv(pchRet3, 1, SOCKS5_RECV_TIMEOUT, hSocket);
            if (recvr != IntrRecvError::OK) {
                return error("Error reading from proxy");
            }
            int nRecv = pchRet3[0];
            recvr = InterruptibleRecv(pchRet3, nRecv, SOCKS5_RECV_TIMEOUT, hSocket);
            break;
        }
        default: return error("Error: malformed proxy response");
    }
    if (recvr != IntrRecvError::OK) {
        return error("Error reading from proxy");
    }
    if ((recvr = InterruptibleRecv(pchRet3, 2, SOCKS5_RECV_TIMEOUT, hSocket)) != IntrRecvError::OK) {
        return error("Error reading from proxy");
    }
    LogPrint(BCLog::NET, "SOCKS5 connected %s\n", strDest);
    return true;
}

SOCKET CreateSocket(const CService &addrConnect)
{
    struct sockaddr_storage sockaddr;
    socklen_t len = sizeof(sockaddr);
    if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
        LogPrintf("Cannot create socket for %s: unsupported network\n", addrConnect.ToString());
        return INVALID_SOCKET;
    }

    SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
    if (hSocket == INVALID_SOCKET)
        return INVALID_SOCKET;

    if (!IsSelectableSocket(hSocket)) {
        CloseSocket(hSocket);
        LogPrintf("Cannot create connection: non-selectable socket created (fd >= FD_SETSIZE ?)\n");
        return INVALID_SOCKET;
    }

#ifdef SO_NOSIGPIPE
    int set = 1;
    // Different way of disabling SIGPIPE on BSD
    setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
#endif

    //Disable Nagle's algorithm
    SetSocketNoDelay(hSocket);

    // Set to non-blocking
    if (!SetSocketNonBlocking(hSocket, true)) {
        CloseSocket(hSocket);
        LogPrintf("ConnectSocketDirectly: Setting socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
    }
    return hSocket;
}

bool ConnectSocketDirectly(const CService &addrConnect, const SOCKET& hSocket, int nTimeout)
{
    struct sockaddr_storage sockaddr;
    socklen_t len = sizeof(sockaddr);
    if (hSocket == INVALID_SOCKET) {
        LogPrintf("Cannot connect to %s: invalid socket\n", addrConnect.ToString());
        return false;
    }
    if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
        LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToString());
        return false;
    }
    if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
    {
        int nErr = WSAGetLastError();
        // WSAEINVAL is here because some legacy version of winsock uses it
        if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL)
        {
            struct timeval timeout = MillisToTimeval(nTimeout);
            fd_set fdset;
            FD_ZERO(&fdset);
            FD_SET(hSocket, &fdset);
            int nRet = select(hSocket + 1, nullptr, &fdset, nullptr, &timeout);
            if (nRet == 0)
            {
                LogPrint(BCLog::NET, "connection to %s timeout\n", addrConnect.ToString());
                return false;
            }
            if (nRet == SOCKET_ERROR)
            {
                LogPrintf("select() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
                return false;
            }
            socklen_t nRetSize = sizeof(nRet);
#ifdef WIN32
            if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
#else
            if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
#endif
            {
                LogPrintf("getsockopt() for %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
                return false;
            }
            if (nRet != 0)
            {
                LogPrintf("connect() to %s failed after select(): %s\n", addrConnect.ToString(), NetworkErrorString(nRet));
                return false;
            }
        }
#ifdef WIN32
        else if (WSAGetLastError() != WSAEISCONN)
#else
        else
#endif
        {
            LogPrintf("connect() to %s failed: %s\n", addrConnect.ToString(), NetworkErrorString(WSAGetLastError()));
            return false;
        }
    }
    return true;
}

bool SetProxy(enum Network net, const proxyType &addrProxy) {
    assert(net >= 0 && net < NET_MAX);
    if (!addrProxy.IsValid())
        return false;
    LOCK(cs_proxyInfos);
    proxyInfo[net] = addrProxy;
    return true;
}

bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
    assert(net >= 0 && net < NET_MAX);
    LOCK(cs_proxyInfos);
    if (!proxyInfo[net].IsValid())
        return false;
    proxyInfoOut = proxyInfo[net];
    return true;
}

bool SetNameProxy(const proxyType &addrProxy) {
    if (!addrProxy.IsValid())
        return false;
    LOCK(cs_proxyInfos);
    nameProxy = addrProxy;
    return true;
}

bool GetNameProxy(proxyType &nameProxyOut) {
    LOCK(cs_proxyInfos);
    if(!nameProxy.IsValid())
        return false;
    nameProxyOut = nameProxy;
    return true;
}

bool HaveNameProxy() {
    LOCK(cs_proxyInfos);
    return nameProxy.IsValid();
}

bool IsProxy(const CNetAddr &addr) {
    LOCK(cs_proxyInfos);
    for (int i = 0; i < NET_MAX; i++) {
        if (addr == static_cast<CNetAddr>(proxyInfo[i].proxy))
            return true;
    }
    return false;
}

bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDest, int port, const SOCKET& hSocket, int nTimeout, bool *outProxyConnectionFailed)
{
    // first connect to proxy server
    if (!ConnectSocketDirectly(proxy.proxy, hSocket, nTimeout)) {
        if (outProxyConnectionFailed)
            *outProxyConnectionFailed = true;
        return false;
    }
    // do socks negotiation
    if (proxy.randomize_credentials) {
        ProxyCredentials random_auth;
        static std::atomic_int counter(0);
        random_auth.username = random_auth.password = strprintf("%i", counter++);
        if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket)) {
            return false;
        }
    } else {
        if (!Socks5(strDest, (unsigned short)port, 0, hSocket)) {
            return false;
        }
    }
    return true;
}
bool LookupSubNet(const char* pszName, CSubNet& ret)
{
    std::string strSubnet(pszName);
    size_t slash = strSubnet.find_last_of('/');
    std::vector<CNetAddr> vIP;

    std::string strAddress = strSubnet.substr(0, slash);
    if (LookupHost(strAddress.c_str(), vIP, 1, false))
    {
        CNetAddr network = vIP[0];
        if (slash != strSubnet.npos)
        {
            std::string strNetmask = strSubnet.substr(slash + 1);
            int32_t n;
            // IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n
            if (ParseInt32(strNetmask, &n)) { // If valid number, assume /24 syntax
                ret = CSubNet(network, n);
                return ret.IsValid();
            }
            else // If not a valid number, try full netmask syntax
            {
                // Never allow lookup for netmask
                if (LookupHost(strNetmask.c_str(), vIP, 1, false)) {
                    ret = CSubNet(network, vIP[0]);
                    return ret.IsValid();
                }
            }
        }
        else
        {
            ret = CSubNet(network);
            return ret.IsValid();
        }
    }
    return false;
}

#ifdef WIN32
std::string NetworkErrorString(int err)
{
    char buf[256];
    buf[0] = 0;
    if(FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
            nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            buf, sizeof(buf), nullptr))
    {
        return strprintf("%s (%d)", buf, err);
    }
    else
    {
        return strprintf("Unknown error (%d)", err);
    }
}
#else
std::string NetworkErrorString(int err)
{
    char buf[256];
    buf[0] = 0;
    /* Too bad there are two incompatible implementations of the
     * thread-safe strerror. */
    const char *s;
#ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
    s = strerror_r(err, buf, sizeof(buf));
#else /* POSIX variant always returns message in buffer */
    s = buf;
    if (strerror_r(err, buf, sizeof(buf)))
        buf[0] = 0;
#endif
    return strprintf("%s (%d)", s, err);
}
#endif

bool CloseSocket(SOCKET& hSocket)
{
    if (hSocket == INVALID_SOCKET)
        return false;
#ifdef WIN32
    int ret = closesocket(hSocket);
#else
    int ret = close(hSocket);
#endif
    if (ret) {
        LogPrintf("Socket close failed: %d. Error: %s\n", hSocket, NetworkErrorString(WSAGetLastError()));
    }
    hSocket = INVALID_SOCKET;
    return ret != SOCKET_ERROR;
}

bool SetSocketNonBlocking(const SOCKET& hSocket, bool fNonBlocking)
{
    if (fNonBlocking) {
#ifdef WIN32
        u_long nOne = 1;
        if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) {
#else
        int fFlags = fcntl(hSocket, F_GETFL, 0);
        if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == SOCKET_ERROR) {
#endif
            return false;
        }
    } else {
#ifdef WIN32
        u_long nZero = 0;
        if (ioctlsocket(hSocket, FIONBIO, &nZero) == SOCKET_ERROR) {
#else
        int fFlags = fcntl(hSocket, F_GETFL, 0);
        if (fcntl(hSocket, F_SETFL, fFlags & ~O_NONBLOCK) == SOCKET_ERROR) {
#endif
            return false;
        }
    }

    return true;
}

bool SetSocketNoDelay(const SOCKET& hSocket)
{
    int set = 1;
    int rc = setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
    return rc == 0;
}

void InterruptSocks5(bool interrupt)
{
    interruptSocks5Recv = interrupt;
}