+++ /dev/null
-// Copyright (c) 2013-2014 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-package addrmgr
-
-import (
- "fmt"
- "net"
-
- "github.com/btcsuite/btcd/wire"
-)
-
-var (
- // rfc1918Nets specifies the IPv4 private address blocks as defined by
- // by RFC1918 (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16).
- rfc1918Nets = []net.IPNet{
- ipNet("10.0.0.0", 8, 32),
- ipNet("172.16.0.0", 12, 32),
- ipNet("192.168.0.0", 16, 32),
- }
-
- // rfc2544Net specifies the the IPv4 block as defined by RFC2544
- // (198.18.0.0/15)
- rfc2544Net = ipNet("198.18.0.0", 15, 32)
-
- // rfc3849Net specifies the IPv6 documentation address block as defined
- // by RFC3849 (2001:DB8::/32).
- rfc3849Net = ipNet("2001:DB8::", 32, 128)
-
- // rfc3927Net specifies the IPv4 auto configuration address block as
- // defined by RFC3927 (169.254.0.0/16).
- rfc3927Net = ipNet("169.254.0.0", 16, 32)
-
- // rfc3964Net specifies the IPv6 to IPv4 encapsulation address block as
- // defined by RFC3964 (2002::/16).
- rfc3964Net = ipNet("2002::", 16, 128)
-
- // rfc4193Net specifies the IPv6 unique local address block as defined
- // by RFC4193 (FC00::/7).
- rfc4193Net = ipNet("FC00::", 7, 128)
-
- // rfc4380Net specifies the IPv6 teredo tunneling over UDP address block
- // as defined by RFC4380 (2001::/32).
- rfc4380Net = ipNet("2001::", 32, 128)
-
- // rfc4843Net specifies the IPv6 ORCHID address block as defined by
- // RFC4843 (2001:10::/28).
- rfc4843Net = ipNet("2001:10::", 28, 128)
-
- // rfc4862Net specifies the IPv6 stateless address autoconfiguration
- // address block as defined by RFC4862 (FE80::/64).
- rfc4862Net = ipNet("FE80::", 64, 128)
-
- // rfc5737Net specifies the IPv4 documentation address blocks as defined
- // by RFC5737 (192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24)
- rfc5737Net = []net.IPNet{
- ipNet("192.0.2.0", 24, 32),
- ipNet("198.51.100.0", 24, 32),
- ipNet("203.0.113.0", 24, 32),
- }
-
- // rfc6052Net specifies the IPv6 well-known prefix address block as
- // defined by RFC6052 (64:FF9B::/96).
- rfc6052Net = ipNet("64:FF9B::", 96, 128)
-
- // rfc6145Net specifies the IPv6 to IPv4 translated address range as
- // defined by RFC6145 (::FFFF:0:0:0/96).
- rfc6145Net = ipNet("::FFFF:0:0:0", 96, 128)
-
- // rfc6598Net specifies the IPv4 block as defined by RFC6598 (100.64.0.0/10)
- rfc6598Net = ipNet("100.64.0.0", 10, 32)
-
- // onionCatNet defines the IPv6 address block used to support Tor.
- // bitcoind encodes a .onion address as a 16 byte number by decoding the
- // address prior to the .onion (i.e. the key hash) base32 into a ten
- // byte number. It then stores the first 6 bytes of the address as
- // 0xfd, 0x87, 0xd8, 0x7e, 0xeb, 0x43.
- //
- // This is the same range used by OnionCat, which is part part of the
- // RFC4193 unique local IPv6 range.
- //
- // In summary the format is:
- // { magic 6 bytes, 10 bytes base32 decode of key hash }
- onionCatNet = ipNet("fd87:d87e:eb43::", 48, 128)
-
- // zero4Net defines the IPv4 address block for address staring with 0
- // (0.0.0.0/8).
- zero4Net = ipNet("0.0.0.0", 8, 32)
-
- // heNet defines the Hurricane Electric IPv6 address block.
- heNet = ipNet("2001:470::", 32, 128)
-)
-
-// ipNet returns a net.IPNet struct given the passed IP address string, number
-// of one bits to include at the start of the mask, and the total number of bits
-// for the mask.
-func ipNet(ip string, ones, bits int) net.IPNet {
- return net.IPNet{IP: net.ParseIP(ip), Mask: net.CIDRMask(ones, bits)}
-}
-
-// IsIPv4 returns whether or not the given address is an IPv4 address.
-func IsIPv4(na *wire.NetAddress) bool {
- return na.IP.To4() != nil
-}
-
-// IsLocal returns whether or not the given address is a local address.
-func IsLocal(na *wire.NetAddress) bool {
- return na.IP.IsLoopback() || zero4Net.Contains(na.IP)
-}
-
-// IsOnionCatTor returns whether or not the passed address is in the IPv6 range
-// used by bitcoin to support Tor (fd87:d87e:eb43::/48). Note that this range
-// is the same range used by OnionCat, which is part of the RFC4193 unique local
-// IPv6 range.
-func IsOnionCatTor(na *wire.NetAddress) bool {
- return onionCatNet.Contains(na.IP)
-}
-
-// IsRFC1918 returns whether or not the passed address is part of the IPv4
-// private network address space as defined by RFC1918 (10.0.0.0/8,
-// 172.16.0.0/12, or 192.168.0.0/16).
-func IsRFC1918(na *wire.NetAddress) bool {
- for _, rfc := range rfc1918Nets {
- if rfc.Contains(na.IP) {
- return true
- }
- }
- return false
-}
-
-// IsRFC2544 returns whether or not the passed address is part of the IPv4
-// address space as defined by RFC2544 (198.18.0.0/15)
-func IsRFC2544(na *wire.NetAddress) bool {
- return rfc2544Net.Contains(na.IP)
-}
-
-// IsRFC3849 returns whether or not the passed address is part of the IPv6
-// documentation range as defined by RFC3849 (2001:DB8::/32).
-func IsRFC3849(na *wire.NetAddress) bool {
- return rfc3849Net.Contains(na.IP)
-}
-
-// IsRFC3927 returns whether or not the passed address is part of the IPv4
-// autoconfiguration range as defined by RFC3927 (169.254.0.0/16).
-func IsRFC3927(na *wire.NetAddress) bool {
- return rfc3927Net.Contains(na.IP)
-}
-
-// IsRFC3964 returns whether or not the passed address is part of the IPv6 to
-// IPv4 encapsulation range as defined by RFC3964 (2002::/16).
-func IsRFC3964(na *wire.NetAddress) bool {
- return rfc3964Net.Contains(na.IP)
-}
-
-// IsRFC4193 returns whether or not the passed address is part of the IPv6
-// unique local range as defined by RFC4193 (FC00::/7).
-func IsRFC4193(na *wire.NetAddress) bool {
- return rfc4193Net.Contains(na.IP)
-}
-
-// IsRFC4380 returns whether or not the passed address is part of the IPv6
-// teredo tunneling over UDP range as defined by RFC4380 (2001::/32).
-func IsRFC4380(na *wire.NetAddress) bool {
- return rfc4380Net.Contains(na.IP)
-}
-
-// IsRFC4843 returns whether or not the passed address is part of the IPv6
-// ORCHID range as defined by RFC4843 (2001:10::/28).
-func IsRFC4843(na *wire.NetAddress) bool {
- return rfc4843Net.Contains(na.IP)
-}
-
-// IsRFC4862 returns whether or not the passed address is part of the IPv6
-// stateless address autoconfiguration range as defined by RFC4862 (FE80::/64).
-func IsRFC4862(na *wire.NetAddress) bool {
- return rfc4862Net.Contains(na.IP)
-}
-
-// IsRFC5737 returns whether or not the passed address is part of the IPv4
-// documentation address space as defined by RFC5737 (192.0.2.0/24,
-// 198.51.100.0/24, 203.0.113.0/24)
-func IsRFC5737(na *wire.NetAddress) bool {
- for _, rfc := range rfc5737Net {
- if rfc.Contains(na.IP) {
- return true
- }
- }
-
- return false
-}
-
-// IsRFC6052 returns whether or not the passed address is part of the IPv6
-// well-known prefix range as defined by RFC6052 (64:FF9B::/96).
-func IsRFC6052(na *wire.NetAddress) bool {
- return rfc6052Net.Contains(na.IP)
-}
-
-// IsRFC6145 returns whether or not the passed address is part of the IPv6 to
-// IPv4 translated address range as defined by RFC6145 (::FFFF:0:0:0/96).
-func IsRFC6145(na *wire.NetAddress) bool {
- return rfc6145Net.Contains(na.IP)
-}
-
-// IsRFC6598 returns whether or not the passed address is part of the IPv4
-// shared address space specified by RFC6598 (100.64.0.0/10)
-func IsRFC6598(na *wire.NetAddress) bool {
- return rfc6598Net.Contains(na.IP)
-}
-
-// IsValid returns whether or not the passed address is valid. The address is
-// considered invalid under the following circumstances:
-// IPv4: It is either a zero or all bits set address.
-// IPv6: It is either a zero or RFC3849 documentation address.
-func IsValid(na *wire.NetAddress) bool {
- // IsUnspecified returns if address is 0, so only all bits set, and
- // RFC3849 need to be explicitly checked.
- return na.IP != nil && !(na.IP.IsUnspecified() ||
- na.IP.Equal(net.IPv4bcast))
-}
-
-// IsRoutable returns whether or not the passed address is routable over
-// the public internet. This is true as long as the address is valid and is not
-// in any reserved ranges.
-func IsRoutable(na *wire.NetAddress) bool {
- return IsValid(na) && !(IsRFC1918(na) || IsRFC2544(na) ||
- IsRFC3927(na) || IsRFC4862(na) || IsRFC3849(na) ||
- IsRFC4843(na) || IsRFC5737(na) || IsRFC6598(na) ||
- IsLocal(na) || (IsRFC4193(na) && !IsOnionCatTor(na)))
-}
-
-// GroupKey returns a string representing the network group an address is part
-// of. This is the /16 for IPv4, the /32 (/36 for he.net) for IPv6, the string
-// "local" for a local address, the string "tor:key" where key is the /4 of the
-// onion address for Tor address, and the string "unroutable" for an unroutable
-// address.
-func GroupKey(na *wire.NetAddress) string {
- if IsLocal(na) {
- return "local"
- }
- if !IsRoutable(na) {
- return "unroutable"
- }
- if IsIPv4(na) {
- return na.IP.Mask(net.CIDRMask(16, 32)).String()
- }
- if IsRFC6145(na) || IsRFC6052(na) {
- // last four bytes are the ip address
- ip := na.IP[12:16]
- return ip.Mask(net.CIDRMask(16, 32)).String()
- }
-
- if IsRFC3964(na) {
- ip := na.IP[2:6]
- return ip.Mask(net.CIDRMask(16, 32)).String()
-
- }
- if IsRFC4380(na) {
- // teredo tunnels have the last 4 bytes as the v4 address XOR
- // 0xff.
- ip := net.IP(make([]byte, 4))
- for i, byte := range na.IP[12:16] {
- ip[i] = byte ^ 0xff
- }
- return ip.Mask(net.CIDRMask(16, 32)).String()
- }
- if IsOnionCatTor(na) {
- // group is keyed off the first 4 bits of the actual onion key.
- return fmt.Sprintf("tor:%d", na.IP[6]&((1<<4)-1))
- }
-
- // OK, so now we know ourselves to be a IPv6 address.
- // bitcoind uses /32 for everything, except for Hurricane Electric's
- // (he.net) IP range, which it uses /36 for.
- bits := 32
- if heNet.Contains(na.IP) {
- bits = 36
- }
-
- return na.IP.Mask(net.CIDRMask(bits, 128)).String()
-}
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