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352 lines
9.7 KiB
352 lines
9.7 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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"encoding/hex"
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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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"github.com/pkg/errors"
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)
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// NetAddress defines information about a peer on the network
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// including its ID, IP address, and port.
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type NetAddress struct {
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ID ID `json:"id"`
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IP net.IP `json:"ip"`
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Port uint16 `json:"port"`
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// TODO:
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// Name string `json:"name"` // optional DNS name
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// memoize .String()
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str string
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}
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// IDAddressString returns id@hostPort. It strips the leading
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// protocol from protocolHostPort if it exists.
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func IDAddressString(id ID, protocolHostPort string) string {
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hostPort := removeProtocolIfDefined(protocolHostPort)
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return fmt.Sprintf("%s@%s", id, hostPort)
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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. Panics if ID is invalid.
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// TODO: socks proxies?
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func NewNetAddress(id ID, 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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panic(fmt.Sprintf("Only TCPAddrs are supported. Got: %v", addr))
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} else { // in testing
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netAddr := NewNetAddressIPPort(net.IP("0.0.0.0"), 0)
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netAddr.ID = id
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return netAddr
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}
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}
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if err := validateID(id); err != nil {
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panic(fmt.Sprintf("Invalid ID %v: %v (addr: %v)", id, err, addr))
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}
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ip := tcpAddr.IP
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port := uint16(tcpAddr.Port)
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na := NewNetAddressIPPort(ip, port)
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na.ID = id
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return na
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}
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// NewNetAddressString returns a new NetAddress using the provided address in
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// the form of "ID@IP:Port".
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// Also resolves the host if host is not an IP.
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// Errors are of type ErrNetAddressXxx where Xxx is in (NoID, Invalid, Lookup)
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func NewNetAddressString(addr string) (*NetAddress, error) {
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addrWithoutProtocol := removeProtocolIfDefined(addr)
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spl := strings.Split(addrWithoutProtocol, "@")
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if len(spl) != 2 {
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return nil, ErrNetAddressNoID{addr}
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}
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// get ID
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if err := validateID(ID(spl[0])); err != nil {
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return nil, ErrNetAddressInvalid{addrWithoutProtocol, err}
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}
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var id ID
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id, addrWithoutProtocol = ID(spl[0]), spl[1]
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// get host and port
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host, portStr, err := net.SplitHostPort(addrWithoutProtocol)
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if err != nil {
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return nil, ErrNetAddressInvalid{addrWithoutProtocol, err}
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}
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if len(host) == 0 {
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return nil, ErrNetAddressInvalid{
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addrWithoutProtocol,
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errors.New("host is empty")}
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}
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ip := net.ParseIP(host)
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if ip == nil {
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ips, err := net.LookupIP(host)
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if err != nil {
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return nil, ErrNetAddressLookup{host, err}
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}
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ip = ips[0]
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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, ErrNetAddressInvalid{portStr, err}
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}
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na := NewNetAddressIPPort(ip, uint16(port))
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na.ID = id
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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, 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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return &NetAddress{
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IP: ip,
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Port: port,
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}
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}
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// Equals reports whether na and other are the same addresses,
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// including their ID, IP, and Port.
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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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// Same returns true is na has the same non-empty ID or DialString as other.
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func (na *NetAddress) Same(other interface{}) bool {
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if o, ok := other.(*NetAddress); ok {
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if na.DialString() == o.DialString() {
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return true
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}
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if na.ID != "" && na.ID == o.ID {
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return true
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}
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}
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return false
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}
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// String representation: <ID>@<IP>:<PORT>
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func (na *NetAddress) String() string {
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if na == nil {
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return "<nil-NetAddress>"
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}
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if na.str == "" {
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addrStr := na.DialString()
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if na.ID != "" {
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addrStr = IDAddressString(na.ID, addrStr)
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}
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na.str = addrStr
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}
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return na.str
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}
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func (na *NetAddress) DialString() string {
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if na == nil {
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return "<nil-NetAddress>"
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}
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return 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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// 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.DialString())
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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.DialString(), 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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if err := na.Valid(); err != nil {
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return false
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}
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// TODO(oga) bitcoind doesn't include RFC3849 here, but should we?
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return !(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() error {
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if err := validateID(na.ID); err != nil {
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return errors.Wrap(err, "invalid ID")
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}
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if na.IP == nil {
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return errors.New("no IP")
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}
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if na.IP.IsUnspecified() || na.RFC3849() || na.IP.Equal(net.IPv4bcast) {
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return errors.New("invalid IP")
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}
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return nil
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}
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// HasID returns true if the address has an ID.
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// NOTE: It does not check whether the ID is valid or not.
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func (na *NetAddress) HasID() bool {
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return string(na.ID) != ""
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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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Ipv6Weak
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Ipv4
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Ipv6Strong
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)
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switch {
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case !na.Routable():
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return Unreachable
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case na.RFC4380():
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switch {
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case !o.Routable():
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return Default
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case o.RFC4380():
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return Teredo
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case o.IP.To4() != nil:
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return Ipv4
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default: // ipv6
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return Ipv6Weak
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}
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case 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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default: /* 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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switch {
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case !o.Routable():
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return Default
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case o.RFC4380():
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return Teredo
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case o.IP.To4() != nil:
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return Ipv4
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case tunnelled:
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// only prioritise ipv6 if we aren't tunnelling it.
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return Ipv6Weak
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}
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return Ipv6Strong
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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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}
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return addr
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}
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func validateID(id ID) error {
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if len(id) == 0 {
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return errors.New("no ID")
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}
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idBytes, err := hex.DecodeString(string(id))
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if err != nil {
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return err
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}
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if len(idBytes) != IDByteLength {
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return fmt.Errorf("invalid hex length - got %d, expected %d", len(idBytes), IDByteLength)
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}
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return nil
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}
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