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262 lines
7.5 KiB
262 lines
7.5 KiB
// Modified for Tendermint
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// Originally Copyright (c) 2013-2014 Conformal Systems LLC.
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// https://github.com/conformal/btcd/blob/master/LICENSE
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package p2p
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import (
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"flag"
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"fmt"
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"net"
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"strconv"
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"strings"
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"time"
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cmn "github.com/tendermint/tmlibs/common"
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)
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// NetAddress defines information about a peer on the network
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// including its IP address, and port.
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type NetAddress struct {
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IP net.IP
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Port uint16
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str string
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}
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// NewNetAddress returns a new NetAddress using the provided TCP
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// address. When testing, other net.Addr (except TCP) will result in
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// using 0.0.0.0:0. When normal run, other net.Addr (except TCP) will
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// panic.
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// TODO: socks proxies?
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func NewNetAddress(addr net.Addr) *NetAddress {
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tcpAddr, ok := addr.(*net.TCPAddr)
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if !ok {
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if flag.Lookup("test.v") == nil { // normal run
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cmn.PanicSanity(cmn.Fmt("Only TCPAddrs are supported. Got: %v", addr))
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} else { // in testing
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return NewNetAddressIPPort(net.IP("0.0.0.0"), 0)
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}
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}
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ip := tcpAddr.IP
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port := uint16(tcpAddr.Port)
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return NewNetAddressIPPort(ip, port)
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}
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// NewNetAddressString returns a new NetAddress using the provided
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// address in the form of "IP:Port". Also resolves the host if host
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// is not an IP.
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func NewNetAddressString(addr string) (*NetAddress, error) {
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host, portStr, err := net.SplitHostPort(removeProtocolIfDefined(addr))
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if err != nil {
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return nil, err
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}
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ip := net.ParseIP(host)
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if ip == nil {
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if len(host) > 0 {
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ips, err := net.LookupIP(host)
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if err != nil {
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return nil, err
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}
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ip = ips[0]
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}
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}
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port, err := strconv.ParseUint(portStr, 10, 16)
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if err != nil {
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return nil, err
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}
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na := NewNetAddressIPPort(ip, uint16(port))
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return na, nil
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}
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// NewNetAddressStrings returns an array of NetAddress'es build using
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// the provided strings.
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func NewNetAddressStrings(addrs []string) ([]*NetAddress, []error) {
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netAddrs := make([]*NetAddress, 0)
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errs := make([]error, 0)
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for _, addr := range addrs {
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netAddr, err := NewNetAddressString(addr)
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if err != nil {
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errs = append(errs, fmt.Errorf("Error in address %s: %v", addr, err))
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} else {
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netAddrs = append(netAddrs, netAddr)
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}
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}
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return netAddrs, errs
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}
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// NewNetAddressIPPort returns a new NetAddress using the provided IP
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// and port number.
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func NewNetAddressIPPort(ip net.IP, port uint16) *NetAddress {
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na := &NetAddress{
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IP: ip,
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Port: port,
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str: net.JoinHostPort(
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ip.String(),
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strconv.FormatUint(uint64(port), 10),
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),
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}
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return na
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}
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// Equals reports whether na and other are the same addresses.
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func (na *NetAddress) Equals(other interface{}) bool {
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if o, ok := other.(*NetAddress); ok {
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return na.String() == o.String()
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}
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return false
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}
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func (na *NetAddress) Less(other interface{}) bool {
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if o, ok := other.(*NetAddress); ok {
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return na.String() < o.String()
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}
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cmn.PanicSanity("Cannot compare unequal types")
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return false
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}
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// String representation.
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func (na *NetAddress) String() string {
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if na.str == "" {
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na.str = net.JoinHostPort(
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na.IP.String(),
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strconv.FormatUint(uint64(na.Port), 10),
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)
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}
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return na.str
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}
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// Dial calls net.Dial on the address.
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func (na *NetAddress) Dial() (net.Conn, error) {
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conn, err := net.Dial("tcp", na.String())
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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// DialTimeout calls net.DialTimeout on the address.
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func (na *NetAddress) DialTimeout(timeout time.Duration) (net.Conn, error) {
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conn, err := net.DialTimeout("tcp", na.String(), timeout)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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// Routable returns true if the address is routable.
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func (na *NetAddress) Routable() bool {
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// TODO(oga) bitcoind doesn't include RFC3849 here, but should we?
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return na.Valid() && !(na.RFC1918() || na.RFC3927() || na.RFC4862() ||
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na.RFC4193() || na.RFC4843() || na.Local())
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}
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// For IPv4 these are either a 0 or all bits set address. For IPv6 a zero
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// address or one that matches the RFC3849 documentation address format.
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func (na *NetAddress) Valid() bool {
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return na.IP != nil && !(na.IP.IsUnspecified() || na.RFC3849() ||
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na.IP.Equal(net.IPv4bcast))
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}
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// Local returns true if it is a local address.
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func (na *NetAddress) Local() bool {
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return na.IP.IsLoopback() || zero4.Contains(na.IP)
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}
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// ReachabilityTo checks whenever o can be reached from na.
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func (na *NetAddress) ReachabilityTo(o *NetAddress) int {
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const (
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Unreachable = 0
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Default = iota
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Teredo
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Ipv6_weak
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Ipv4
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Ipv6_strong
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)
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if !na.Routable() {
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return Unreachable
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} else if na.RFC4380() {
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if !o.Routable() {
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return Default
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} else if o.RFC4380() {
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return Teredo
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} else if o.IP.To4() != nil {
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return Ipv4
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} else { // ipv6
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return Ipv6_weak
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}
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} else if na.IP.To4() != nil {
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if o.Routable() && o.IP.To4() != nil {
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return Ipv4
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}
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return Default
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} else /* ipv6 */ {
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var tunnelled bool
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// Is our v6 is tunnelled?
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if o.RFC3964() || o.RFC6052() || o.RFC6145() {
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tunnelled = true
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}
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if !o.Routable() {
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return Default
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} else if o.RFC4380() {
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return Teredo
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} else if o.IP.To4() != nil {
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return Ipv4
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} else if tunnelled {
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// only prioritise ipv6 if we aren't tunnelling it.
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return Ipv6_weak
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}
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return Ipv6_strong
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}
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}
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// RFC1918: IPv4 Private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
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// RFC3849: IPv6 Documentation address (2001:0DB8::/32)
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// RFC3927: IPv4 Autoconfig (169.254.0.0/16)
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// RFC3964: IPv6 6to4 (2002::/16)
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// RFC4193: IPv6 unique local (FC00::/7)
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// RFC4380: IPv6 Teredo tunneling (2001::/32)
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// RFC4843: IPv6 ORCHID: (2001:10::/28)
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// RFC4862: IPv6 Autoconfig (FE80::/64)
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// RFC6052: IPv6 well known prefix (64:FF9B::/96)
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// RFC6145: IPv6 IPv4 translated address ::FFFF:0:0:0/96
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var rfc1918_10 = net.IPNet{IP: net.ParseIP("10.0.0.0"), Mask: net.CIDRMask(8, 32)}
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var rfc1918_192 = net.IPNet{IP: net.ParseIP("192.168.0.0"), Mask: net.CIDRMask(16, 32)}
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var rfc1918_172 = net.IPNet{IP: net.ParseIP("172.16.0.0"), Mask: net.CIDRMask(12, 32)}
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var rfc3849 = net.IPNet{IP: net.ParseIP("2001:0DB8::"), Mask: net.CIDRMask(32, 128)}
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var rfc3927 = net.IPNet{IP: net.ParseIP("169.254.0.0"), Mask: net.CIDRMask(16, 32)}
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var rfc3964 = net.IPNet{IP: net.ParseIP("2002::"), Mask: net.CIDRMask(16, 128)}
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var rfc4193 = net.IPNet{IP: net.ParseIP("FC00::"), Mask: net.CIDRMask(7, 128)}
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var rfc4380 = net.IPNet{IP: net.ParseIP("2001::"), Mask: net.CIDRMask(32, 128)}
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var rfc4843 = net.IPNet{IP: net.ParseIP("2001:10::"), Mask: net.CIDRMask(28, 128)}
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var rfc4862 = net.IPNet{IP: net.ParseIP("FE80::"), Mask: net.CIDRMask(64, 128)}
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var rfc6052 = net.IPNet{IP: net.ParseIP("64:FF9B::"), Mask: net.CIDRMask(96, 128)}
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var rfc6145 = net.IPNet{IP: net.ParseIP("::FFFF:0:0:0"), Mask: net.CIDRMask(96, 128)}
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var zero4 = net.IPNet{IP: net.ParseIP("0.0.0.0"), Mask: net.CIDRMask(8, 32)}
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func (na *NetAddress) RFC1918() bool {
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return rfc1918_10.Contains(na.IP) ||
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rfc1918_192.Contains(na.IP) ||
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rfc1918_172.Contains(na.IP)
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}
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func (na *NetAddress) RFC3849() bool { return rfc3849.Contains(na.IP) }
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func (na *NetAddress) RFC3927() bool { return rfc3927.Contains(na.IP) }
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func (na *NetAddress) RFC3964() bool { return rfc3964.Contains(na.IP) }
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func (na *NetAddress) RFC4193() bool { return rfc4193.Contains(na.IP) }
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func (na *NetAddress) RFC4380() bool { return rfc4380.Contains(na.IP) }
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func (na *NetAddress) RFC4843() bool { return rfc4843.Contains(na.IP) }
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func (na *NetAddress) RFC4862() bool { return rfc4862.Contains(na.IP) }
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func (na *NetAddress) RFC6052() bool { return rfc6052.Contains(na.IP) }
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func (na *NetAddress) RFC6145() bool { return rfc6145.Contains(na.IP) }
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func removeProtocolIfDefined(addr string) string {
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if strings.Contains(addr, "://") {
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return strings.Split(addr, "://")[1]
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} else {
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return addr
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}
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}
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