// Modified for Tendermint // Originally Copyright (c) 2013-2014 Conformal Systems LLC. // https://github.com/conformal/btcd/blob/master/LICENSE package p2p import ( "fmt" "net" "strconv" "time" ) type NetAddress struct { IP net.IP Port uint16 str string } // TODO: socks proxies? func NewNetAddress(addr net.Addr) *NetAddress { tcpAddr, ok := addr.(*net.TCPAddr) if !ok { panic(fmt.Sprintf("Only TCPAddrs are supported. Got: %v", addr)) } 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, str: net.JoinHostPort( ip.String(), strconv.FormatUint(uint64(port), 10), ), } return na } func (na *NetAddress) Equals(other interface{}) bool { if o, ok := other.(*NetAddress); ok { return na.String() == o.String() } else { return false } } func (na *NetAddress) Less(other interface{}) bool { if o, ok := other.(*NetAddress); ok { return na.String() < o.String() } else { panic("Cannot compare unequal types") } } func (na *NetAddress) String() string { if na.str == "" { na.str = net.JoinHostPort( na.IP.String(), strconv.FormatUint(uint64(na.Port), 10), ) } return na.str } func (na *NetAddress) Dial() (net.Conn, error) { conn, err := net.Dial("tcp", na.String()) if err != nil { return nil, err } return conn, nil } func (na *NetAddress) DialTimeout(timeout time.Duration) (net.Conn, error) { conn, err := net.DialTimeout("tcp", na.String(), timeout) if err != nil { return nil, err } return 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) }