908 lines
26 KiB
C++
908 lines
26 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
|
|
// Copyright (c) 2009-2020 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 <cstdint>
|
|
#include <netaddress.h>
|
|
#include <hash.h>
|
|
#include <util/strencodings.h>
|
|
#include <util/asmap.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 };
|
|
|
|
/**
|
|
* Construct an unspecified IPv6 network address (::/128).
|
|
*
|
|
* @note This address is considered invalid by CNetAddr::IsValid()
|
|
*/
|
|
CNetAddr::CNetAddr()
|
|
{
|
|
memset(ip, 0, sizeof(ip));
|
|
}
|
|
|
|
void CNetAddr::SetIP(const CNetAddr& ipIn)
|
|
{
|
|
m_net = ipIn.m_net;
|
|
memcpy(ip, ipIn.ip, sizeof(ip));
|
|
}
|
|
|
|
void CNetAddr::SetLegacyIPv6(const uint8_t ipv6[16])
|
|
{
|
|
if (memcmp(ipv6, pchIPv4, sizeof(pchIPv4)) == 0) {
|
|
m_net = NET_IPV4;
|
|
} else if (memcmp(ipv6, pchOnionCat, sizeof(pchOnionCat)) == 0) {
|
|
m_net = NET_ONION;
|
|
} else if (memcmp(ipv6, g_internal_prefix, sizeof(g_internal_prefix)) == 0) {
|
|
m_net = NET_INTERNAL;
|
|
} else {
|
|
m_net = NET_IPV6;
|
|
}
|
|
memcpy(ip, ipv6, 16);
|
|
}
|
|
|
|
void CNetAddr::SetRaw(Network network, const uint8_t *ip_in)
|
|
{
|
|
switch(network)
|
|
{
|
|
case NET_IPV4:
|
|
m_net = NET_IPV4;
|
|
memcpy(ip, pchIPv4, 12);
|
|
memcpy(ip+12, ip_in, 4);
|
|
break;
|
|
case NET_IPV6:
|
|
SetLegacyIPv6(ip_in);
|
|
break;
|
|
default:
|
|
assert(!"invalid network");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Try to make this a dummy address that maps the specified name into IPv6 like
|
|
* so: (0xFD + %sha256("bitcoin")[0:5]) + %sha256(name)[0:10]. Such dummy
|
|
* addresses have a prefix of fd6b:88c0:8724::/48 and are guaranteed to not be
|
|
* publicly routable as it falls under RFC4193's fc00::/7 subnet allocated to
|
|
* unique-local addresses.
|
|
*
|
|
* CAddrMan uses these fake addresses to keep track of which DNS seeds were
|
|
* used.
|
|
*
|
|
* @returns Whether or not the operation was successful.
|
|
*
|
|
* @see CNetAddr::IsInternal(), CNetAddr::IsRFC4193()
|
|
*/
|
|
bool CNetAddr::SetInternal(const std::string &name)
|
|
{
|
|
if (name.empty()) {
|
|
return false;
|
|
}
|
|
m_net = NET_INTERNAL;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Try to make this a dummy address that maps the specified onion address into
|
|
* IPv6 using OnionCat's range and encoding. Such dummy addresses have a prefix
|
|
* of fd87:d87e:eb43::/48 and are guaranteed to not be publicly routable as they
|
|
* fall under RFC4193's fc00::/7 subnet allocated to unique-local addresses.
|
|
*
|
|
* @returns Whether or not the operation was successful.
|
|
*
|
|
* @see CNetAddr::IsTor(), CNetAddr::IsRFC4193()
|
|
*/
|
|
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;
|
|
m_net = NET_ONION;
|
|
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(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::IsBindAny() const
|
|
{
|
|
const int cmplen = IsIPv4() ? 4 : 16;
|
|
for (int i = 0; i < cmplen; ++i) {
|
|
if (GetByte(i)) return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CNetAddr::IsIPv4() const { return m_net == NET_IPV4; }
|
|
|
|
bool CNetAddr::IsIPv6() const { return m_net == NET_IPV6; }
|
|
|
|
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 IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
|
|
GetByte(13) == 0x0D && GetByte(12) == 0xB8;
|
|
}
|
|
|
|
bool CNetAddr::IsRFC3964() const
|
|
{
|
|
return IsIPv6() && 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 IsIPv6() && memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0;
|
|
}
|
|
|
|
bool CNetAddr::IsRFC4380() const
|
|
{
|
|
return IsIPv6() && 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 IsIPv6() && memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0;
|
|
}
|
|
|
|
bool CNetAddr::IsRFC4193() const
|
|
{
|
|
return IsIPv6() && (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 IsIPv6() && memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0;
|
|
}
|
|
|
|
bool CNetAddr::IsRFC4843() const
|
|
{
|
|
return IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
|
|
GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10;
|
|
}
|
|
|
|
bool CNetAddr::IsRFC7343() const
|
|
{
|
|
return IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
|
|
GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x20;
|
|
}
|
|
|
|
bool CNetAddr::IsHeNet() const
|
|
{
|
|
return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70);
|
|
}
|
|
|
|
/**
|
|
* @returns Whether or not this is a dummy address that maps an onion address
|
|
* into IPv6.
|
|
*
|
|
* @see CNetAddr::SetSpecial(const std::string &)
|
|
*/
|
|
bool CNetAddr::IsTor() const { return m_net == NET_ONION; }
|
|
|
|
bool CNetAddr::IsLocal() const
|
|
{
|
|
// IPv4 loopback (127.0.0.0/8 or 0.0.0.0/8)
|
|
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 (IsIPv6() && memcmp(ip, pchLocal, 16) == 0)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @returns Whether or not this network address is a valid address that @a could
|
|
* be used to refer to an actual host.
|
|
*
|
|
* @note A valid address may or may not be publicly routable on the global
|
|
* internet. As in, the set of valid addresses is a superset of the set of
|
|
* publicly routable addresses.
|
|
*
|
|
* @see CNetAddr::IsRoutable()
|
|
*/
|
|
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 (IsIPv6() && memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
|
|
return false;
|
|
|
|
// unspecified IPv6 address (::/128)
|
|
unsigned char ipNone6[16] = {};
|
|
if (IsIPv6() && 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;
|
|
}
|
|
|
|
/**
|
|
* @returns Whether or not this network address is publicly routable on the
|
|
* global internet.
|
|
*
|
|
* @note A routable address is always valid. As in, the set of routable addresses
|
|
* is a subset of the set of valid addresses.
|
|
*
|
|
* @see CNetAddr::IsValid()
|
|
*/
|
|
bool CNetAddr::IsRoutable() const
|
|
{
|
|
return IsValid() && !(IsRFC1918() || IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsRFC7343() || IsLocal() || IsInternal());
|
|
}
|
|
|
|
/**
|
|
* @returns Whether or not this is a dummy address that maps a name into IPv6.
|
|
*
|
|
* @see CNetAddr::SetInternal(const std::string &)
|
|
*/
|
|
bool CNetAddr::IsInternal() const
|
|
{
|
|
return m_net == NET_INTERNAL;
|
|
}
|
|
|
|
enum Network CNetAddr::GetNetwork() const
|
|
{
|
|
if (IsInternal())
|
|
return NET_INTERNAL;
|
|
|
|
if (!IsRoutable())
|
|
return NET_UNROUTABLE;
|
|
|
|
return m_net;
|
|
}
|
|
|
|
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 a.m_net == b.m_net && memcmp(a.ip, b.ip, 16) == 0;
|
|
}
|
|
|
|
bool operator<(const CNetAddr& a, const CNetAddr& b)
|
|
{
|
|
return a.m_net < b.m_net || (a.m_net == b.m_net && memcmp(a.ip, b.ip, 16) < 0);
|
|
}
|
|
|
|
/**
|
|
* Try to get our IPv4 address.
|
|
*
|
|
* @param[out] pipv4Addr The in_addr struct to which to copy.
|
|
*
|
|
* @returns Whether or not the operation was successful, in particular, whether
|
|
* or not our address was an IPv4 address.
|
|
*
|
|
* @see CNetAddr::IsIPv4()
|
|
*/
|
|
bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
|
|
{
|
|
if (!IsIPv4())
|
|
return false;
|
|
memcpy(pipv4Addr, ip+12, 4);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Try to get our IPv6 address.
|
|
*
|
|
* @param[out] pipv6Addr The in6_addr struct to which to copy.
|
|
*
|
|
* @returns Whether or not the operation was successful, in particular, whether
|
|
* or not our address was an IPv6 address.
|
|
*
|
|
* @see CNetAddr::IsIPv6()
|
|
*/
|
|
bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
|
|
{
|
|
if (!IsIPv6()) {
|
|
return false;
|
|
}
|
|
memcpy(pipv6Addr, ip, 16);
|
|
return true;
|
|
}
|
|
|
|
bool CNetAddr::HasLinkedIPv4() const
|
|
{
|
|
return IsRoutable() && (IsIPv4() || IsRFC6145() || IsRFC6052() || IsRFC3964() || IsRFC4380());
|
|
}
|
|
|
|
uint32_t CNetAddr::GetLinkedIPv4() const
|
|
{
|
|
if (IsIPv4() || IsRFC6145() || IsRFC6052()) {
|
|
// IPv4, mapped IPv4, SIIT translated IPv4: the IPv4 address is the last 4 bytes of the address
|
|
return ReadBE32(ip + 12);
|
|
} else if (IsRFC3964()) {
|
|
// 6to4 tunneled IPv4: the IPv4 address is in bytes 2-6
|
|
return ReadBE32(ip + 2);
|
|
} else if (IsRFC4380()) {
|
|
// Teredo tunneled IPv4: the IPv4 address is in the last 4 bytes of the address, but bitflipped
|
|
return ~ReadBE32(ip + 12);
|
|
}
|
|
assert(false);
|
|
}
|
|
|
|
uint32_t CNetAddr::GetNetClass() const {
|
|
uint32_t net_class = NET_IPV6;
|
|
if (IsLocal()) {
|
|
net_class = 255;
|
|
}
|
|
if (IsInternal()) {
|
|
net_class = NET_INTERNAL;
|
|
} else if (!IsRoutable()) {
|
|
net_class = NET_UNROUTABLE;
|
|
} else if (HasLinkedIPv4()) {
|
|
net_class = NET_IPV4;
|
|
} else if (IsTor()) {
|
|
net_class = NET_ONION;
|
|
}
|
|
return net_class;
|
|
}
|
|
|
|
uint32_t CNetAddr::GetMappedAS(const std::vector<bool> &asmap) const {
|
|
uint32_t net_class = GetNetClass();
|
|
if (asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) {
|
|
return 0; // Indicates not found, safe because AS0 is reserved per RFC7607.
|
|
}
|
|
std::vector<bool> ip_bits(128);
|
|
if (HasLinkedIPv4()) {
|
|
// For lookup, treat as if it was just an IPv4 address (pchIPv4 prefix + IPv4 bits)
|
|
for (int8_t byte_i = 0; byte_i < 12; ++byte_i) {
|
|
for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
|
|
ip_bits[byte_i * 8 + bit_i] = (pchIPv4[byte_i] >> (7 - bit_i)) & 1;
|
|
}
|
|
}
|
|
uint32_t ipv4 = GetLinkedIPv4();
|
|
for (int i = 0; i < 32; ++i) {
|
|
ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1;
|
|
}
|
|
} else {
|
|
// Use all 128 bits of the IPv6 address otherwise
|
|
for (int8_t byte_i = 0; byte_i < 16; ++byte_i) {
|
|
uint8_t cur_byte = GetByte(15 - byte_i);
|
|
for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) {
|
|
ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1;
|
|
}
|
|
}
|
|
}
|
|
uint32_t mapped_as = Interpret(asmap, ip_bits);
|
|
return mapped_as;
|
|
}
|
|
|
|
/**
|
|
* Get the canonical identifier of our network group
|
|
*
|
|
* The groups are assigned in a way where it should be costly for an attacker to
|
|
* obtain addresses with many different group identifiers, even if it is cheap
|
|
* to obtain addresses with the same identifier.
|
|
*
|
|
* @note No two connections will be attempted to addresses with the same network
|
|
* group.
|
|
*/
|
|
std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) const
|
|
{
|
|
std::vector<unsigned char> vchRet;
|
|
uint32_t net_class = GetNetClass();
|
|
// If non-empty asmap is supplied and the address is IPv4/IPv6,
|
|
// return ASN to be used for bucketing.
|
|
uint32_t asn = GetMappedAS(asmap);
|
|
if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR).
|
|
vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket
|
|
for (int i = 0; i < 4; i++) {
|
|
vchRet.push_back((asn >> (8 * i)) & 0xFF);
|
|
}
|
|
return vchRet;
|
|
}
|
|
|
|
vchRet.push_back(net_class);
|
|
int nStartByte = 0;
|
|
int nBits = 16;
|
|
|
|
if (IsLocal()) {
|
|
// all local addresses belong to the same group
|
|
nBits = 0;
|
|
} else if (IsInternal()) {
|
|
// all internal-usage addresses get their own group
|
|
nStartByte = sizeof(g_internal_prefix);
|
|
nBits = (sizeof(ip) - sizeof(g_internal_prefix)) * 8;
|
|
} else if (!IsRoutable()) {
|
|
// all other unroutable addresses belong to the same group
|
|
nBits = 0;
|
|
} else if (HasLinkedIPv4()) {
|
|
// IPv4 addresses (and mapped IPv4 addresses) use /16 groups
|
|
uint32_t ipv4 = GetLinkedIPv4();
|
|
vchRet.push_back((ipv4 >> 24) & 0xFF);
|
|
vchRet.push_back((ipv4 >> 16) & 0xFF);
|
|
return vchRet;
|
|
} else if (IsTor()) {
|
|
nStartByte = 6;
|
|
nBits = 4;
|
|
} else if (IsHeNet()) {
|
|
// for he.net, use /36 groups
|
|
nBits = 36;
|
|
} else {
|
|
// for the rest of the IPv6 network, use /32 groups
|
|
nBits = 32;
|
|
}
|
|
|
|
// push our ip onto vchRet byte by byte...
|
|
while (nBits >= 8)
|
|
{
|
|
vchRet.push_back(GetByte(15 - nStartByte));
|
|
nStartByte++;
|
|
nBits -= 8;
|
|
}
|
|
// ...for the last byte, push nBits and for the rest of the byte push 1's
|
|
if (nBits > 0)
|
|
vchRet.push_back(GetByte(15 - nStartByte) | ((1 << (8 - nBits)) - 1));
|
|
|
|
return vchRet;
|
|
}
|
|
|
|
uint64_t CNetAddr::GetHash() const
|
|
{
|
|
uint256 hash = Hash(ip);
|
|
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_ONION:
|
|
switch(ourNet) {
|
|
default: return REACH_DEFAULT;
|
|
case NET_IPV4: return REACH_IPV4; // Tor users can connect to IPv4 as well
|
|
case NET_ONION: 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_ONION: return REACH_PRIVATE; // either from Tor, or don't care about our address
|
|
}
|
|
}
|
|
}
|
|
|
|
CService::CService() : port(0)
|
|
{
|
|
}
|
|
|
|
CService::CService(const CNetAddr& cip, uint16_t portIn) : CNetAddr(cip), port(portIn)
|
|
{
|
|
}
|
|
|
|
CService::CService(const struct in_addr& ipv4Addr, uint16_t portIn) : CNetAddr(ipv4Addr), port(portIn)
|
|
{
|
|
}
|
|
|
|
CService::CService(const struct in6_addr& ipv6Addr, uint16_t 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;
|
|
}
|
|
}
|
|
|
|
uint16_t CService::GetPort() const
|
|
{
|
|
return port;
|
|
}
|
|
|
|
bool operator==(const CService& a, const CService& b)
|
|
{
|
|
return static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port == b.port;
|
|
}
|
|
|
|
bool operator<(const CService& a, const CService& b)
|
|
{
|
|
return static_cast<CNetAddr>(a) < static_cast<CNetAddr>(b) || (static_cast<CNetAddr>(a) == static_cast<CNetAddr>(b) && a.port < b.port);
|
|
}
|
|
|
|
/**
|
|
* Obtain the IPv4/6 socket address this represents.
|
|
*
|
|
* @param[out] paddr The obtained socket address.
|
|
* @param[in,out] addrlen The size, in bytes, of the address structure pointed
|
|
* to by paddr. The value that's pointed to by this
|
|
* parameter might change after calling this function if
|
|
* the size of the corresponding address structure
|
|
* changed.
|
|
*
|
|
* @returns Whether or not the operation was successful.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* @returns An identifier unique to this service's address and port number.
|
|
*/
|
|
std::vector<unsigned char> CService::GetKey() const
|
|
{
|
|
auto key = GetAddrBytes();
|
|
key.push_back(port / 0x100); // most significant byte of our port
|
|
key.push_back(port & 0x0FF); // least significant byte of our port
|
|
return key;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* @returns True if this subnet is valid, the specified address is valid, and
|
|
* the specified address belongs in this subnet.
|
|
*/
|
|
bool CSubNet::Match(const CNetAddr &addr) const
|
|
{
|
|
if (!valid || !addr.IsValid() || network.m_net != addr.m_net)
|
|
return false;
|
|
for(int x=0; x<16; ++x)
|
|
if ((addr.ip[x] & netmask[x]) != network.ip[x])
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @returns The number of 1-bits in the prefix of the specified subnet mask. If
|
|
* the specified subnet mask is not a valid one, -1.
|
|
*/
|
|
static inline int NetmaskBits(uint8_t x)
|
|
{
|
|
switch(x) {
|
|
case 0x00: return 0;
|
|
case 0x80: return 1;
|
|
case 0xc0: return 2;
|
|
case 0xe0: return 3;
|
|
case 0xf0: return 4;
|
|
case 0xf8: return 5;
|
|
case 0xfc: return 6;
|
|
case 0xfe: return 7;
|
|
case 0xff: return 8;
|
|
default: return -1;
|
|
}
|
|
}
|
|
|
|
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.network < b.network || (a.network == b.network && memcmp(a.netmask, b.netmask, 16) < 0));
|
|
}
|
|
|
|
bool SanityCheckASMap(const std::vector<bool>& asmap)
|
|
{
|
|
return SanityCheckASMap(asmap, 128); // For IP address lookups, the input is 128 bits
|
|
}
|