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tendermint/p2p/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 p2p
import (
"encoding/hex"
"flag"
"fmt"
"net"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
cmn "github.com/tendermint/tmlibs/common"
)
// NetAddress defines information about a peer on the network
// including its ID, IP address, and port.
type NetAddress struct {
ID ID
IP net.IP
Port uint16
str string
}
// NewNetAddress returns a new NetAddress using the provided TCP
// address. When testing, other net.Addr (except TCP) will result in
// using 0.0.0.0:0. When normal run, other net.Addr (except TCP) will
// panic.
// TODO: socks proxies?
func NewNetAddress(id ID, addr net.Addr) *NetAddress {
tcpAddr, ok := addr.(*net.TCPAddr)
if !ok {
if flag.Lookup("test.v") == nil { // normal run
cmn.PanicSanity(cmn.Fmt("Only TCPAddrs are supported. Got: %v", addr))
} else { // in testing
netAddr := NewNetAddressIPPort(net.IP("0.0.0.0"), 0)
netAddr.ID = id
return netAddr
}
}
ip := tcpAddr.IP
port := uint16(tcpAddr.Port)
netAddr := NewNetAddressIPPort(ip, port)
netAddr.ID = id
return netAddr
}
// NewNetAddressString returns a new NetAddress using the provided
// address in the form of "IP:Port". Also resolves the host if host
// is not an IP.
func NewNetAddressString(addr string) (*NetAddress, error) {
addr = removeProtocolIfDefined(addr)
var id ID
spl := strings.Split(addr, "@")
if len(spl) == 2 {
idStr := spl[0]
idBytes, err := hex.DecodeString(idStr)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("Address (%s) contains invalid ID", addr))
}
if len(idBytes) != 20 {
return nil, fmt.Errorf("Address (%s) contains ID of invalid length (%d). Should be 20 hex-encoded bytes", len(idBytes))
}
id, addr = ID(idStr), spl[1]
}
host, portStr, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
ip := net.ParseIP(host)
if ip == nil {
if len(host) > 0 {
ips, err := net.LookupIP(host)
if err != nil {
return nil, err
}
ip = ips[0]
}
}
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return nil, err
}
na := NewNetAddressIPPort(ip, uint16(port))
na.ID = id
return na, nil
}
// NewNetAddressStrings returns an array of NetAddress'es build using
// the provided strings.
func NewNetAddressStrings(addrs []string) ([]*NetAddress, []error) {
netAddrs := make([]*NetAddress, 0)
errs := make([]error, 0)
for _, addr := range addrs {
netAddr, err := NewNetAddressString(addr)
if err != nil {
errs = append(errs, fmt.Errorf("Error in address %s: %v", addr, err))
} else {
netAddrs = append(netAddrs, netAddr)
}
}
return netAddrs, errs
}
// NewNetAddressIPPort returns a new NetAddress using the provided IP
// and port number.
func NewNetAddressIPPort(ip net.IP, port uint16) *NetAddress {
na := &NetAddress{
IP: ip,
Port: port,
}
return na
}
// Equals reports whether na and other are the same addresses.
func (na *NetAddress) Equals(other interface{}) bool {
if o, ok := other.(*NetAddress); ok {
return na.String() == o.String()
}
return false
}
// String representation: <ID>@<IP>:<PORT>
func (na *NetAddress) String() string {
if na.str == "" {
addrStr := na.DialString()
if na.ID != "" {
addrStr = fmt.Sprintf("%s@%s", na.ID, addrStr)
}
na.str = addrStr
}
return na.str
}
func (na *NetAddress) DialString() string {
return net.JoinHostPort(
na.IP.String(),
strconv.FormatUint(uint64(na.Port), 10),
)
}
// Dial calls net.Dial on the address.
func (na *NetAddress) Dial() (net.Conn, error) {
conn, err := net.Dial("tcp", na.DialString())
if err != nil {
return nil, err
}
return conn, nil
}
// DialTimeout calls net.DialTimeout on the address.
func (na *NetAddress) DialTimeout(timeout time.Duration) (net.Conn, error) {
conn, err := net.DialTimeout("tcp", na.DialString(), timeout)
if err != nil {
return nil, err
}
return conn, nil
}
// Routable returns true if the address is routable.
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))
}
// Local returns true if it is a local address.
func (na *NetAddress) Local() bool {
return na.IP.IsLoopback() || zero4.Contains(na.IP)
}
// ReachabilityTo checks whenever o can be reached from na.
func (na *NetAddress) ReachabilityTo(o *NetAddress) int {
const (
Unreachable = 0
Default = iota
Teredo
Ipv6_weak
Ipv4
Ipv6_strong
)
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) }
func removeProtocolIfDefined(addr string) string {
if strings.Contains(addr, "://") {
return strings.Split(addr, "://")[1]
} else {
return addr
}
}