bitcoin/src/netaddress.cpp at master · Dash-OS/bitcoin · GitHub

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// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <netaddress.h>

#include <hash.h>

#include <utilstrencodings.h>

#include <tinyformat.h>

static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };

static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};

// 0xFD + sha256("bitcoin")[0:5]

static const unsigned char g_internal_prefix[] = { 0xFD, 0x6B, 0x88, 0xC0, 0x87, 0x24 };

void CNetAddr::Init()

{

memset(ip, 0, sizeof(ip));

scopeId = 0;

}

void CNetAddr::SetIP(const CNetAddr& ipIn)

{

memcpy(ip, ipIn.ip, sizeof(ip));

}

void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)

{

switch(network)

{

case NET_IPV4:

memcpy(ip, pchIPv4, 12);

memcpy(ip+12, ip_in, 4);

break;

case NET_IPV6:

memcpy(ip, ip_in, 16);

break;

default:

assert(!"invalid network");

}

bool CNetAddr::SetInternal(const std::string &name)

{

if (name.empty()) {

return false;

}

unsigned char hash[32] = {};

CSHA256().Write((const unsigned char*)name.data(), name.size()).Finalize(hash);

memcpy(ip, g_internal_prefix, sizeof(g_internal_prefix));

memcpy(ip + sizeof(g_internal_prefix), hash, sizeof(ip) - sizeof(g_internal_prefix));

return true;

}

bool CNetAddr::SetSpecial(const std::string &strName)

{

if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") {

std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str());

if (vchAddr.size() != 16-sizeof(pchOnionCat))

return false;

memcpy(ip, pchOnionCat, sizeof(pchOnionCat));

for (unsigned int i=0; i<16-sizeof(pchOnionCat); i++)

ip[i + sizeof(pchOnionCat)] = vchAddr[i];

return true;

}

return false;

}

CNetAddr::CNetAddr()

{

Init();

}

CNetAddr::CNetAddr(const struct in_addr& ipv4Addr)

{

SetRaw(NET_IPV4, (const uint8_t*)&ipv4Addr);

}

CNetAddr::CNetAddr(const struct in6_addr& ipv6Addr, const uint32_t scope)

{

SetRaw(NET_IPV6, (const uint8_t*)&ipv6Addr);

scopeId = scope;

}

unsigned int CNetAddr::GetByte(int n) const

{

return ip[15-n];

}

bool CNetAddr::IsIPv4() const

{

return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);

}

bool CNetAddr::IsIPv6() const

{

return (!IsIPv4() && !IsTor() && !IsInternal());

}

bool CNetAddr::IsRFC1918() const

{

return IsIPv4() && (

GetByte(3) == 10 ||

(GetByte(3) == 192 && GetByte(2) == 168) ||

(GetByte(3) == 172 && (GetByte(2) >= 16 && GetByte(2) <= 31)));

}

bool CNetAddr::IsRFC2544() const

{

return IsIPv4() && GetByte(3) == 198 && (GetByte(2) == 18 || GetByte(2) == 19);

}

bool CNetAddr::IsRFC3927() const

{

return IsIPv4() && (GetByte(3) == 169 && GetByte(2) == 254);

}

bool CNetAddr::IsRFC6598() const

{

return IsIPv4() && GetByte(3) == 100 && GetByte(2) >= 64 && GetByte(2) <= 127;

}

bool CNetAddr::IsRFC5737() const

{

return IsIPv4() && ((GetByte(3) == 192 && GetByte(2) == 0 && GetByte(1) == 2) ||

(GetByte(3) == 198 && GetByte(2) == 51 && GetByte(1) == 100) ||

(GetByte(3) == 203 && GetByte(2) == 0 && GetByte(1) == 113));

}

bool CNetAddr::IsRFC3849() const

{

return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;

}

bool CNetAddr::IsRFC3964() const

{

return (GetByte(15) == 0x20 && GetByte(14) == 0x02);

}

bool CNetAddr::IsRFC6052() const

{

static const unsigned char pchRFC6052[] = {0,0x64,0xFF,0x9B,0,0,0,0,0,0,0,0};

return (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);

}

bool CNetAddr::IsRFC4380() const

{

return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);

}

bool CNetAddr::IsRFC4862() const

{

static const unsigned char pchRFC4862[] = {0xFE,0x80,0,0,0,0,0,0};

return (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);

}

bool CNetAddr::IsRFC4193() const

{

return ((GetByte(15) & 0xFE) == 0xFC);

}

bool CNetAddr::IsRFC6145() const

{

static const unsigned char pchRFC6145[] = {0,0,0,0,0,0,0,0,0xFF,0xFF,0,0};

return (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);

}

bool CNetAddr::IsRFC4843() const

{

return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);

}

bool CNetAddr::IsTor() const

{

return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);

}

bool CNetAddr::IsLocal() const

{

// IPv4 loopback

if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))

return true;

// IPv6 loopback (::1/128)

static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};

if (memcmp(ip, pchLocal, 16) == 0)

return true;

return false;

}

bool CNetAddr::IsValid() const

{

// Cleanup 3-byte shifted addresses caused by garbage in size field

// of addr messages from versions before 0.2.9 checksum.

// Two consecutive addr messages look like this:

// header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26...

// so if the first length field is garbled, it reads the second batch

// of addr misaligned by 3 bytes.

if (memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)

return false;

// unspecified IPv6 address (::/128)

unsigned char ipNone6[16] = {};

if (memcmp(ip, ipNone6, 16) == 0)

return false;

// documentation IPv6 address

if (IsRFC3849())

return false;

if (IsInternal())

return false;

if (IsIPv4())

{

// INADDR_NONE

uint32_t ipNone = INADDR_NONE;

if (memcmp(ip+12, &ipNone, 4) == 0)

return false;

// 0

ipNone = 0;

if (memcmp(ip+12, &ipNone, 4) == 0)

return false;

}

return true;

}

bool CNetAddr::IsRoutable() const

{

return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal() || IsInternal());

}

bool CNetAddr::IsInternal() const

{

return memcmp(ip, g_internal_prefix, sizeof(g_internal_prefix)) == 0;

}

enum Network CNetAddr::GetNetwork() const

{

if (IsInternal())

return NET_INTERNAL;

if (!IsRoutable())

return NET_UNROUTABLE;

if (IsIPv4())

return NET_IPV4;

if (IsTor())

return NET_TOR;

return NET_IPV6;

}

std::string CNetAddr::ToStringIP() const

{

if (IsTor())

return EncodeBase32(&ip[6], 10) + ".onion";

if (IsInternal())

return EncodeBase32(ip + sizeof(g_internal_prefix), sizeof(ip) - sizeof(g_internal_prefix)) + ".internal";

CService serv(*this, 0);

struct sockaddr_storage sockaddr;

socklen_t socklen = sizeof(sockaddr);

if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) {

char name[1025] = "";

if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), nullptr, 0, NI_NUMERICHOST))

return std::string(name);

}

if (IsIPv4())

return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0));

else

return strprintf("%x:%x:%x:%x:%x:%x:%x:%x",

GetByte(15) << 8 | GetByte(14), GetByte(13) << 8 | GetByte(12),

GetByte(11) << 8 | GetByte(10), GetByte(9) << 8 | GetByte(8),

GetByte(7) << 8 | GetByte(6), GetByte(5) << 8 | GetByte(4),

GetByte(3) << 8 | GetByte(2), GetByte(1) << 8 | GetByte(0));

}

std::string CNetAddr::ToString() const

{

return ToStringIP();

}

bool operator==(const CNetAddr& a, const CNetAddr& b)

{

return (memcmp(a.ip, b.ip, 16) == 0);

}

bool operator!=(const CNetAddr& a, const CNetAddr& b)

{

return (memcmp(a.ip, b.ip, 16) != 0);

}

bool operator<(const CNetAddr& a, const CNetAddr& b)

{

return (memcmp(a.ip, b.ip, 16) < 0);

}

bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const

{

if (!IsIPv4())

return false;

memcpy(pipv4Addr, ip+12, 4);

return true;

}

bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const

{

memcpy(pipv6Addr, ip, 16);

return true;

}

// get canonical identifier of an address' group

// no two connections will be attempted to addresses with the same group

std::vector<unsigned char> CNetAddr::GetGroup() const

{

std::vector<unsigned char> vchRet;

int nClass = NET_IPV6;

int nStartByte = 0;

int nBits = 16;

// all local addresses belong to the same group

if (IsLocal())

{

nClass = 255;

nBits = 0;

}

// all internal-usage addresses get their own group

if (IsInternal())

{

nClass = NET_INTERNAL;

nStartByte = sizeof(g_internal_prefix);

nBits = (sizeof(ip) - sizeof(g_internal_prefix)) * 8;

}

// all other unroutable addresses belong to the same group

else if (!IsRoutable())

{

nClass = NET_UNROUTABLE;

nBits = 0;

}

// for IPv4 addresses, '1' + the 16 higher-order bits of the IP

// includes mapped IPv4, SIIT translated IPv4, and the well-known prefix

else if (IsIPv4() || IsRFC6145() || IsRFC6052())

{

nClass = NET_IPV4;

nStartByte = 12;

}

// for 6to4 tunnelled addresses, use the encapsulated IPv4 address

else if (IsRFC3964())

{

nClass = NET_IPV4;

nStartByte = 2;

}

// for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address

else if (IsRFC4380())

{

vchRet.push_back(NET_IPV4);

vchRet.push_back(GetByte(3) ^ 0xFF);

vchRet.push_back(GetByte(2) ^ 0xFF);

return vchRet;

}

else if (IsTor())

{

nClass = NET_TOR;

nStartByte = 6;

nBits = 4;

}

// for he.net, use /36 groups

else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70)

nBits = 36;

// for the rest of the IPv6 network, use /32 groups

else

nBits = 32;

vchRet.push_back(nClass);

while (nBits >= 8)

{

vchRet.push_back(GetByte(15 - nStartByte));

nStartByte++;

nBits -= 8;

}

if (nBits > 0)

vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));

return vchRet;

}

uint64_t CNetAddr::GetHash() const

{

uint256 hash = Hash(&ip[0], &ip[16]);

uint64_t nRet;

memcpy(&nRet, &hash, sizeof(nRet));

return nRet;

}

// private extensions to enum Network, only returned by GetExtNetwork,

// and only used in GetReachabilityFrom

static const int NET_UNKNOWN = NET_MAX + 0;

static const int NET_TEREDO = NET_MAX + 1;

int static GetExtNetwork(const CNetAddr *addr)

{

if (addr == nullptr)

return NET_UNKNOWN;

if (addr->IsRFC4380())

return NET_TEREDO;

return addr->GetNetwork();

}

/** Calculates a metric for how reachable (*this) is from a given partner */

int CNetAddr::GetReachabilityFrom(const CNetAddr *paddrPartner) const

{

enum Reachability {

REACH_UNREACHABLE,

REACH_DEFAULT,

REACH_TEREDO,

REACH_IPV6_WEAK,

REACH_IPV4,

REACH_IPV6_STRONG,

REACH_PRIVATE

};

if (!IsRoutable() || IsInternal())

return REACH_UNREACHABLE;

int ourNet = GetExtNetwork(this);

int theirNet = GetExtNetwork(paddrPartner);

bool fTunnel = IsRFC3964() || IsRFC6052() || IsRFC6145();

switch(theirNet) {

case NET_IPV4:

switch(ourNet) {

default: return REACH_DEFAULT;

case NET_IPV4: return REACH_IPV4;

}

case NET_IPV6:

switch(ourNet) {

default: return REACH_DEFAULT;

case NET_TEREDO: return REACH_TEREDO;

case NET_IPV4: return REACH_IPV4;

case NET_IPV6: return fTunnel ? REACH_IPV6_WEAK : REACH_IPV6_STRONG; // only prefer giving our IPv6 address if it's not tunnelled

}

case NET_TOR:

switch(ourNet) {

default: return REACH_DEFAULT;

case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well

case NET_TOR: return REACH_PRIVATE;

}

case NET_TEREDO:

switch(ourNet) {

default: return REACH_DEFAULT;

case NET_TEREDO: return REACH_TEREDO;

case NET_IPV6: return REACH_IPV6_WEAK;

case NET_IPV4: return REACH_IPV4;

}

case NET_UNKNOWN:

case NET_UNROUTABLE:

default:

switch(ourNet) {

default: return REACH_DEFAULT;

case NET_TEREDO: return REACH_TEREDO;

case NET_IPV6: return REACH_IPV6_WEAK;

case NET_IPV4: return REACH_IPV4;

case NET_TOR: return REACH_PRIVATE; // either from Tor, or don't care about our address

}

void CService::Init()

{

port = 0;

}

CService::CService()

{

Init();

}

CService::CService(const CNetAddr& cip, unsigned short portIn) : CNetAddr(cip), port(portIn)

{

}

CService::CService(const struct in_addr& ipv4Addr, unsigned short portIn) : CNetAddr(ipv4Addr), port(portIn)

{

}

CService::CService(const struct in6_addr& ipv6Addr, unsigned short portIn) : CNetAddr(ipv6Addr), port(portIn)

{

}

CService::CService(const struct sockaddr_in& addr) : CNetAddr(addr.sin_addr), port(ntohs(addr.sin_port))

{

assert(addr.sin_family == AF_INET);

}

CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr, addr.sin6_scope_id), port(ntohs(addr.sin6_port))

{

assert(addr.sin6_family == AF_INET6);

}

bool CService::SetSockAddr(const struct sockaddr *paddr)

{

switch (paddr->sa_family) {

case AF_INET:

*this = CService(*(const struct sockaddr_in*)paddr);

return true;

case AF_INET6:

*this = CService(*(const struct sockaddr_in6*)paddr);

return true;

default:

return false;

}

unsigned short CService::GetPort() const

{

return port;

}

bool operator==(const CService& a, const CService& b)

{

return (CNetAddr)a == (CNetAddr)b && a.port == b.port;

}

bool operator!=(const CService& a, const CService& b)

{

return (CNetAddr)a != (CNetAddr)b || a.port != b.port;

}

bool operator<(const CService& a, const CService& b)

{

return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);

}

bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const

{

if (IsIPv4()) {

if (*addrlen < (socklen_t)sizeof(struct sockaddr_in))

return false;

*addrlen = sizeof(struct sockaddr_in);

struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;

memset(paddrin, 0, *addrlen);

if (!GetInAddr(&paddrin->sin_addr))

return false;

paddrin->sin_family = AF_INET;

paddrin->sin_port = htons(port);

return true;

}

if (IsIPv6()) {

if (*addrlen < (socklen_t)sizeof(struct sockaddr_in6))

return false;

*addrlen = sizeof(struct sockaddr_in6);

struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;

memset(paddrin6, 0, *addrlen);

if (!GetIn6Addr(&paddrin6->sin6_addr))

return false;

paddrin6->sin6_scope_id = scopeId;

paddrin6->sin6_family = AF_INET6;

paddrin6->sin6_port = htons(port);

return true;

}

return false;

}

std::vector<unsigned char> CService::GetKey() const

{

std::vector<unsigned char> vKey;

vKey.resize(18);

memcpy(vKey.data(), ip, 16);

vKey[16] = port / 0x100;

vKey[17] = port & 0x0FF;

return vKey;

}

std::string CService::ToStringPort() const

{

return strprintf("%u", port);

}

std::string CService::ToStringIPPort() const

{

if (IsIPv4() || IsTor() || IsInternal()) {

return ToStringIP() + ":" + ToStringPort();

} else {

return "[" + ToStringIP() + "]:" + ToStringPort();

}

std::string CService::ToString() const

{

return ToStringIPPort();

}

CSubNet::CSubNet():

valid(false)

{

memset(netmask, 0, sizeof(netmask));

}

CSubNet::CSubNet(const CNetAddr &addr, int32_t mask)

{

valid = true;

network = addr;

// Default to /32 (IPv4) or /128 (IPv6), i.e. match single address

memset(netmask, 255, sizeof(netmask));

// IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n

const int astartofs = network.IsIPv4() ? 12 : 0;

int32_t n = mask;

if(n >= 0 && n <= (128 - astartofs*8)) // Only valid if in range of bits of address

{

n += astartofs*8;

// Clear bits [n..127]

for (; n < 128; ++n)

netmask[n>>3] &= ~(1<<(7-(n&7)));

} else

valid = false;

// Normalize network according to netmask

for(int x=0; x<16; ++x)

network.ip[x] &= netmask[x];

}

CSubNet::CSubNet(const CNetAddr &addr, const CNetAddr &mask)

{

valid = true;

network = addr;

// Default to /32 (IPv4) or /128 (IPv6), i.e. match single address

memset(netmask, 255, sizeof(netmask));

// IPv4 addresses start at offset 12, and first 12 bytes must match, so just offset n

const int astartofs = network.IsIPv4() ? 12 : 0;

for(int x=astartofs; x<16; ++x)

netmask[x] = mask.ip[x];

// Normalize network according to netmask

for(int x=0; x<16; ++x)

network.ip[x] &= netmask[x];

}

CSubNet::CSubNet(const CNetAddr &addr):

valid(addr.IsValid())

{

memset(netmask, 255, sizeof(netmask));

network = addr;

}

bool CSubNet::Match(const CNetAddr &addr) const

{

if (!valid || !addr.IsValid())

return false;

for(int x=0; x<16; ++x)

if ((addr.ip[x] & netmask[x]) != network.ip[x])

return false;

return true;

}

static inline int NetmaskBits(uint8_t x)

{

switch(x) {

case 0x00: return 0; break;

case 0x80: return 1; break;

case 0xc0: return 2; break;

case 0xe0: return 3; break;

case 0xf0: return 4; break;

case 0xf8: return 5; break;

case 0xfc: return 6; break;

case 0xfe: return 7; break;

case 0xff: return 8; break;

default: return -1; break;

}

std::string CSubNet::ToString() const

{

/* Parse binary 1{n}0{N-n} to see if mask can be represented as /n */

int cidr = 0;

bool valid_cidr = true;

int n = network.IsIPv4() ? 12 : 0;

for (; n < 16 && netmask[n] == 0xff; ++n)

cidr += 8;

if (n < 16) {

int bits = NetmaskBits(netmask[n]);

if (bits < 0)

valid_cidr = false;

else

cidr += bits;

++n;

}

for (; n < 16 && valid_cidr; ++n)

if (netmask[n] != 0x00)

valid_cidr = false;

/* Format output */

std::string strNetmask;

if (valid_cidr) {

strNetmask = strprintf("%u", cidr);

} else {

if (network.IsIPv4())

strNetmask = strprintf("%u.%u.%u.%u", netmask[12], netmask[13], netmask[14], netmask[15]);

else

strNetmask = strprintf("%x:%x:%x:%x:%x:%x:%x:%x",

netmask[0] << 8 | netmask[1], netmask[2] << 8 | netmask[3],

netmask[4] << 8 | netmask[5], netmask[6] << 8 | netmask[7],

netmask[8] << 8 | netmask[9], netmask[10] << 8 | netmask[11],

netmask[12] << 8 | netmask[13], netmask[14] << 8 | netmask[15]);

}

return network.ToString() + "/" + strNetmask;

}

bool CSubNet::IsValid() const

{

return valid;

}

bool operator==(const CSubNet& a, const CSubNet& b)

{

return a.valid == b.valid && a.network == b.network && !memcmp(a.netmask, b.netmask, 16);

}

bool operator!=(const CSubNet& a, const CSubNet& b)

{

return !(a==b);

}

bool operator<(const CSubNet& a, const CSubNet& b)

{

return (a.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));

}

bitcoin/src/netaddress.cpp at master · Dash-OS/bitcoin · GitHub

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