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tendermint/peer/netaddress.go

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// Modified for Tendermint
// Originally Copyright (c) 2013-2014 Conformal Systems LLC.
// https://github.com/conformal/btcd/blob/master/LICENSE
package peer
import (
. "github.com/tendermint/tendermint/binary"
"io"
"net"
"strconv"
)
/* NetAddress */
type NetAddress struct {
IP net.IP
Port UInt16
}
// TODO: socks proxies?
func NewNetAddress(addr net.Addr) *NetAddress {
tcpAddr, ok := addr.(*net.TCPAddr)
if !ok { panic("Only TCPAddrs are supported") }
ip := tcpAddr.IP
port := UInt16(tcpAddr.Port)
return NewNetAddressIPPort(ip, port)
}
func NewNetAddressString(addr string) *NetAddress {
host, portStr, err := net.SplitHostPort(addr)
if err != nil { panic(err) }
ip := net.ParseIP(host)
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil { panic(err) }
na := NewNetAddressIPPort(ip, UInt16(port))
return na
}
func NewNetAddressIPPort(ip net.IP, port UInt16) *NetAddress {
na := NetAddress{
IP: ip,
Port: port,
}
return &na
}
func ReadNetAddress(r io.Reader) *NetAddress {
return &NetAddress{
IP: net.IP(ReadByteSlice(r)),
Port: ReadUInt16(r),
}
}
func (na *NetAddress) WriteTo(w io.Writer) (n int64, err error) {
n, err = WriteOnto(ByteSlice(na.IP.To16()), w, n, err)
n, err = WriteOnto(na.Port, w, n, err)
return
}
func (na *NetAddress) Equals(other Binary) bool {
if o, ok := other.(*NetAddress); ok {
return na.String() == o.String()
} else {
return false
}
}
func (na *NetAddress) Less(other Binary) bool {
if o, ok := other.(*NetAddress); ok {
return na.String() < o.String()
} else {
panic("Cannot compare unequal types")
}
}
func (na *NetAddress) String() string {
port := strconv.FormatUint(uint64(na.Port), 10)
addr := net.JoinHostPort(na.IP.String(), port)
return addr
}
func (na *NetAddress) Dial() (*Connection, error) {
conn, err := net.Dial("tcp", na.String())
if err != nil { return nil, err }
return NewConnection(conn), nil
}
func (na *NetAddress) Routable() bool {
// TODO(oga) bitcoind doesn't include RFC3849 here, but should we?
return na.Valid() && !(na.RFC1918() || na.RFC3927() || na.RFC4862() ||
na.RFC4193() || na.RFC4843() || na.Local())
}
// For IPv4 these are either a 0 or all bits set address. For IPv6 a zero
// address or one that matches the RFC3849 documentation address format.
func (na *NetAddress) Valid() bool {
return na.IP != nil && !(na.IP.IsUnspecified() || na.RFC3849() ||
na.IP.Equal(net.IPv4bcast))
}
func (na *NetAddress) Local() bool {
return na.IP.IsLoopback() || zero4.Contains(na.IP)
}
func (na *NetAddress) ReachabilityTo(o *NetAddress) int {
const (
Unreachable = 0
Default = iota
Teredo
Ipv6_weak
Ipv4
Ipv6_strong
Private
)
if !na.Routable() {
return Unreachable
} else if na.RFC4380() {
if !o.Routable() {
return Default
} else if o.RFC4380() {
return Teredo
} else if o.IP.To4() != nil {
return Ipv4
} else { // ipv6
return Ipv6_weak
}
} else if na.IP.To4() != nil {
if o.Routable() && o.IP.To4() != nil {
return Ipv4
}
return Default
} else /* ipv6 */ {
var tunnelled bool
// Is our v6 is tunnelled?
if o.RFC3964() || o.RFC6052() || o.RFC6145() {
tunnelled = true
}
if !o.Routable() {
return Default
} else if o.RFC4380() {
return Teredo
} else if o.IP.To4() != nil {
return Ipv4
} else if tunnelled {
// only prioritise ipv6 if we aren't tunnelling it.
return Ipv6_weak
}
return Ipv6_strong
}
}
// RFC1918: IPv4 Private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
// RFC3849: IPv6 Documentation address (2001:0DB8::/32)
// RFC3927: IPv4 Autoconfig (169.254.0.0/16)
// RFC3964: IPv6 6to4 (2002::/16)
// RFC4193: IPv6 unique local (FC00::/7)
// RFC4380: IPv6 Teredo tunneling (2001::/32)
// RFC4843: IPv6 ORCHID: (2001:10::/28)
// RFC4862: IPv6 Autoconfig (FE80::/64)
// RFC6052: IPv6 well known prefix (64:FF9B::/96)
// RFC6145: IPv6 IPv4 translated address ::FFFF:0:0:0/96
var rfc1918_10 = net.IPNet{IP: net.ParseIP("10.0.0.0"), Mask: net.CIDRMask(8, 32)}
var rfc1918_192 = net.IPNet{IP: net.ParseIP("192.168.0.0"), Mask: net.CIDRMask(16, 32)}
var rfc1918_172 = net.IPNet{IP: net.ParseIP("172.16.0.0"), Mask: net.CIDRMask(12, 32)}
var rfc3849 = net.IPNet{IP: net.ParseIP("2001:0DB8::"), Mask: net.CIDRMask(32, 128)}
var rfc3927 = net.IPNet{IP: net.ParseIP("169.254.0.0"), Mask: net.CIDRMask(16, 32)}
var rfc3964 = net.IPNet{IP: net.ParseIP("2002::"), Mask: net.CIDRMask(16, 128)}
var rfc4193 = net.IPNet{IP: net.ParseIP("FC00::"), Mask: net.CIDRMask(7, 128)}
var rfc4380 = net.IPNet{IP: net.ParseIP("2001::"), Mask: net.CIDRMask(32, 128)}
var rfc4843 = net.IPNet{IP: net.ParseIP("2001:10::"), Mask: net.CIDRMask(28, 128)}
var rfc4862 = net.IPNet{IP: net.ParseIP("FE80::"), Mask: net.CIDRMask(64, 128)}
var rfc6052 = net.IPNet{IP: net.ParseIP("64:FF9B::"), Mask: net.CIDRMask(96, 128)}
var rfc6145 = net.IPNet{IP: net.ParseIP("::FFFF:0:0:0"), Mask: net.CIDRMask(96, 128)}
var zero4 = net.IPNet{IP: net.ParseIP("0.0.0.0"), Mask: net.CIDRMask(8, 32)}
func (na *NetAddress) RFC1918() bool { return rfc1918_10.Contains(na.IP) ||
rfc1918_192.Contains(na.IP) ||
rfc1918_172.Contains(na.IP) }
func (na *NetAddress) RFC3849() bool { return rfc3849.Contains(na.IP) }
func (na *NetAddress) RFC3927() bool { return rfc3927.Contains(na.IP) }
func (na *NetAddress) RFC3964() bool { return rfc3964.Contains(na.IP) }
func (na *NetAddress) RFC4193() bool { return rfc4193.Contains(na.IP) }
func (na *NetAddress) RFC4380() bool { return rfc4380.Contains(na.IP) }
func (na *NetAddress) RFC4843() bool { return rfc4843.Contains(na.IP) }
func (na *NetAddress) RFC4862() bool { return rfc4862.Contains(na.IP) }
func (na *NetAddress) RFC6052() bool { return rfc6052.Contains(na.IP) }
func (na *NetAddress) RFC6145() bool { return rfc6145.Contains(na.IP) }