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Merged
UdjinM6 merged 6 commits into from
Jan 29, 2021
Merged

Backport partial addrv2 support #3939

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e8c6989
Merge #19360: net: improve encapsulation of CNetAddr
laanwj Jul 15, 2020
78328c1
Fix CService (de)serialization
UdjinM6 Jan 18, 2021
a9a9c3d
Very partial merge bitcoin#19219
PastaPastaPasta Jan 16, 2021
233232c
Merge #15689: netaddress: Update CNetAddr for ORCHIDv2
laanwj Jun 6, 2019
3af7c99
Merge #19351: test: add two edge case tests for CSubNet
laanwj Jun 22, 2020
888f36a
Merge #19534: net: save the network type explicitly in CNetAddr
laanwj Jul 29, 2020
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90 changes: 50 additions & 40 deletions src/netaddress.cpp
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,19 +24,35 @@ CNetAddr::CNetAddr()

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:
memcpy(ip, ip_in, 16);
SetLegacyIPv6(ip_in);
break;
default:
assert(!"invalid network");
Expand All @@ -48,6 +64,7 @@ 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));
Expand All @@ -61,6 +78,7 @@ bool CNetAddr::SetSpecial(const std::string &strName)
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];
Expand Down Expand Up @@ -95,15 +113,9 @@ bool CNetAddr::IsBindAny() const
return true;
}

bool CNetAddr::IsIPv4() const
{
return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
}
bool CNetAddr::IsIPv4() const { return m_net == NET_IPV4; }

bool CNetAddr::IsIPv6() const
{
return (!IsIPv4() && !IsTor() && !IsInternal());
}
bool CNetAddr::IsIPv6() const { return m_net == NET_IPV6; }

bool CNetAddr::IsRFC1918() const
{
Expand Down Expand Up @@ -137,52 +149,58 @@ bool CNetAddr::IsRFC5737() const

bool CNetAddr::IsRFC3849() const
{
return GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x0D && GetByte(12) == 0xB8;
return IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
GetByte(13) == 0x0D && GetByte(12) == 0xB8;
}

bool CNetAddr::IsRFC3964() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x02);
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 (memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0);
return IsIPv6() && memcmp(ip, pchRFC6052, sizeof(pchRFC6052)) == 0;
}

bool CNetAddr::IsRFC4380() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0 && GetByte(12) == 0);
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 (memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0);
return IsIPv6() && memcmp(ip, pchRFC4862, sizeof(pchRFC4862)) == 0;
}

bool CNetAddr::IsRFC4193() const
{
return ((GetByte(15) & 0xFE) == 0xFC);
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 (memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0);
return IsIPv6() && memcmp(ip, pchRFC6145, sizeof(pchRFC6145)) == 0;
}

bool CNetAddr::IsRFC4843() const
{
return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
return IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10;
}

bool CNetAddr::IsTor() const
bool CNetAddr::IsRFC7343() const
{
return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
return IsIPv6() && GetByte(15) == 0x20 && GetByte(14) == 0x01 &&
GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x20;
}

bool CNetAddr::IsTor() const { return m_net == NET_ONION; }

bool CNetAddr::IsLocal() const
{
// IPv4 loopback
Expand All @@ -191,7 +209,7 @@ bool CNetAddr::IsLocal() const

// 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)
if (IsIPv6() && memcmp(ip, pchLocal, 16) == 0)
return true;

return false;
Expand All @@ -205,12 +223,12 @@ bool CNetAddr::IsValid() const
// 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)
if (IsIPv6() && memcmp(ip, pchIPv4+3, sizeof(pchIPv4)-3) == 0)
return false;

// unspecified IPv6 address (::/128)
unsigned char ipNone6[16] = {};
if (memcmp(ip, ipNone6, 16) == 0)
if (IsIPv6() && memcmp(ip, ipNone6, 16) == 0)
return false;

// documentation IPv6 address
Expand Down Expand Up @@ -242,12 +260,12 @@ bool CNetAddr::IsRoutable() const
return false;
if (!fAllowPrivateNet && IsRFC1918())
return false;
return !(IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsLocal() || IsInternal());
return !(IsRFC2544() || IsRFC3927() || IsRFC4862() || IsRFC6598() || IsRFC5737() || (IsRFC4193() && !IsTor()) || IsRFC4843() || IsRFC7343() || IsLocal() || IsInternal());
}

bool CNetAddr::IsInternal() const
{
return memcmp(ip, g_internal_prefix, sizeof(g_internal_prefix)) == 0;
return m_net == NET_INTERNAL;
}

enum Network CNetAddr::GetNetwork() const
Expand All @@ -258,13 +276,7 @@ enum Network CNetAddr::GetNetwork() const
if (!IsRoutable())
return NET_UNROUTABLE;

if (IsIPv4())
return NET_IPV4;

if (IsTor())
return NET_ONION;

return NET_IPV6;
return m_net;
}

std::string CNetAddr::ToStringIP(bool fUseGetnameinfo) const
Expand Down Expand Up @@ -301,12 +313,12 @@ std::string CNetAddr::ToString() const

bool operator==(const CNetAddr& a, const CNetAddr& b)
{
return (memcmp(a.ip, b.ip, 16) == 0);
return a.m_net == b.m_net && memcmp(a.ip, b.ip, 16) == 0;
}

bool operator<(const CNetAddr& a, const CNetAddr& b)
{
return (memcmp(a.ip, b.ip, 16) < 0);
return a.m_net < b.m_net || (a.m_net == b.m_net && memcmp(a.ip, b.ip, 16) < 0);
}

bool CNetAddr::GetInAddr(struct in_addr* pipv4Addr) const
Expand Down Expand Up @@ -568,12 +580,10 @@ bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const

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;
auto key = GetAddrBytes();
key.push_back(port / 0x100);
key.push_back(port & 0x0FF);
return key;
}

std::string CService::ToStringPort() const
Expand Down Expand Up @@ -658,7 +668,7 @@ CSubNet::CSubNet(const CNetAddr &addr):

bool CSubNet::Match(const CNetAddr &addr) const
{
if (!valid || !addr.IsValid())
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])
Expand Down
92 changes: 81 additions & 11 deletions src/netaddress.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,21 +19,50 @@

extern bool fAllowPrivateNet;

/**
* A network type.
* @note An address may belong to more than one network, for example `10.0.0.1`
* belongs to both `NET_UNROUTABLE` and `NET_IPV4`.
* Keep these sequential starting from 0 and `NET_MAX` as the last entry.
* We have loops like `for (int i = 0; i < NET_MAX; i++)` that expect to iterate
* over all enum values and also `GetExtNetwork()` "extends" this enum by
* introducing standalone constants starting from `NET_MAX`.
*/
enum Network
{
/// Addresses from these networks are not publicly routable on the global Internet.
NET_UNROUTABLE = 0,

/// IPv4
NET_IPV4,

/// IPv6
NET_IPV6,

/// TORv2
NET_ONION,

/// A set of dummy addresses that map a name to an IPv6 address. These
/// addresses belong to RFC4193's fc00::/7 subnet (unique-local addresses).
/// We use them to map a string or FQDN to an IPv6 address in CAddrMan to
/// keep track of which DNS seeds were used.
NET_INTERNAL,

/// Dummy value to indicate the number of NET_* constants.
NET_MAX,
};

/** IP address (IPv6, or IPv4 using mapped IPv6 range (::FFFF:0:0/96)) */
/**
* Network address.
*/
class CNetAddr
{
protected:
/**
* Network to which this address belongs.
*/
Network m_net{NET_IPV6};

unsigned char ip[16]; // in network byte order
uint32_t scopeId{0}; // for scoped/link-local ipv6 addresses

Expand All @@ -42,6 +71,14 @@ class CNetAddr
explicit CNetAddr(const struct in_addr& ipv4Addr);
void SetIP(const CNetAddr& ip);

/**
* Set from a legacy IPv6 address.
* Legacy IPv6 address may be a normal IPv6 address, or another address
* (e.g. IPv4) disguised as IPv6. This encoding is used in the legacy
* `addr` encoding.
*/
void SetLegacyIPv6(const uint8_t ipv6[16]);

private:
/**
* Set raw IPv4 or IPv6 address (in network byte order)
Expand Down Expand Up @@ -69,7 +106,8 @@ class CNetAddr
bool IsRFC3964() const; // IPv6 6to4 tunnelling (2002::/16)
bool IsRFC4193() const; // IPv6 unique local (FC00::/7)
bool IsRFC4380() const; // IPv6 Teredo tunnelling (2001::/32)
bool IsRFC4843() const; // IPv6 ORCHID (2001:10::/28)
bool IsRFC4843() const; // IPv6 ORCHID (deprecated) (2001:10::/28)
bool IsRFC7343() const; // IPv6 ORCHIDv2 (2001:20::/28)
bool IsRFC4862() const; // IPv6 autoconfig (FE80::/64)
bool IsRFC6052() const; // IPv6 well-known prefix (64:FF9B::/96)
bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
Expand All @@ -85,6 +123,7 @@ class CNetAddr
uint64_t GetHash() const;
bool GetInAddr(struct in_addr* pipv4Addr) const;
std::vector<unsigned char> GetGroup() const;
std::vector<unsigned char> GetAddrBytes() const { return {std::begin(ip), std::end(ip)}; }
int GetReachabilityFrom(const CNetAddr *paddrPartner = nullptr) const;

explicit CNetAddr(const struct in6_addr& pipv6Addr, const uint32_t scope = 0);
Expand All @@ -94,11 +133,26 @@ class CNetAddr
friend bool operator!=(const CNetAddr& a, const CNetAddr& b) { return !(a == b); }
friend bool operator<(const CNetAddr& a, const CNetAddr& b);

ADD_SERIALIZE_METHODS;
/**
* Serialize to a stream.
*/
template <typename Stream>
void Serialize(Stream& s) const
{
s << ip;
}

template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(ip);
/**
* Unserialize from a stream.
*/
template <typename Stream>
void Unserialize(Stream& s)
{
unsigned char ip_temp[sizeof(ip)];
s >> ip_temp;
// Use SetLegacyIPv6() so that m_net is set correctly. For example
// ::FFFF:0102:0304 should be set as m_net=NET_IPV4 (1.2.3.4).
SetLegacyIPv6(ip_temp);
}

friend class CSubNet;
Expand Down Expand Up @@ -167,12 +221,28 @@ class CService : public CNetAddr
CService(const struct in6_addr& ipv6Addr, unsigned short port);
explicit CService(const struct sockaddr_in6& addr);

ADD_SERIALIZE_METHODS;
/**
* Serialize to a stream.
*/
template <typename Stream>
void Serialize(Stream& s) const
{
s << ip;
s << WrapBigEndian(port);
}

template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(ip);
READWRITE(WrapBigEndian(port));
/**
* Unserialize from a stream.
*/
template <typename Stream>
void Unserialize(Stream& s)
{
unsigned char ip_temp[sizeof(ip)];
s >> ip_temp;
// Use SetLegacyIPv6() so that m_net is set correctly. For example
// ::FFFF:0102:0304 should be set as m_net=NET_IPV4 (1.2.3.4).
SetLegacyIPv6(ip_temp);
s >> WrapBigEndian(port);
}
};

Expand Down
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