Xray-core/common/net/address.go

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2020-11-25 11:01:53 +00:00
package net
import (
"bytes"
"net"
"strings"
)
var (
// LocalHostIP is a constant value for localhost IP in IPv4.
LocalHostIP = IPAddress([]byte{127, 0, 0, 1})
// AnyIP is a constant value for any IP in IPv4.
AnyIP = IPAddress([]byte{0, 0, 0, 0})
// LocalHostDomain is a constant value for localhost domain.
LocalHostDomain = DomainAddress("localhost")
// LocalHostIPv6 is a constant value for localhost IP in IPv6.
LocalHostIPv6 = IPAddress([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1})
// AnyIPv6 is a constant value for any IP in IPv6.
AnyIPv6 = IPAddress([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
)
// AddressFamily is the type of address.
type AddressFamily byte
const (
// AddressFamilyIPv4 represents address as IPv4
AddressFamilyIPv4 = AddressFamily(0)
// AddressFamilyIPv6 represents address as IPv6
AddressFamilyIPv6 = AddressFamily(1)
// AddressFamilyDomain represents address as Domain
AddressFamilyDomain = AddressFamily(2)
)
// IsIPv4 returns true if current AddressFamily is IPv4.
func (af AddressFamily) IsIPv4() bool {
return af == AddressFamilyIPv4
}
// IsIPv6 returns true if current AddressFamily is IPv6.
func (af AddressFamily) IsIPv6() bool {
return af == AddressFamilyIPv6
}
// IsIP returns true if current AddressFamily is IPv6 or IPv4.
func (af AddressFamily) IsIP() bool {
return af == AddressFamilyIPv4 || af == AddressFamilyIPv6
}
// IsDomain returns true if current AddressFamily is Domain.
func (af AddressFamily) IsDomain() bool {
return af == AddressFamilyDomain
}
// Address represents a network address to be communicated with. It may be an IP address or domain
// address, not both. This interface doesn't resolve IP address for a given domain.
type Address interface {
IP() net.IP // IP of this Address
Domain() string // Domain of this Address
Family() AddressFamily
String() string // String representation of this Address
}
func isAlphaNum(c byte) bool {
return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
}
// ParseAddress parses a string into an Address. The return value will be an IPAddress when
// the string is in the form of IPv4 or IPv6 address, or a DomainAddress otherwise.
func ParseAddress(addr string) Address {
// Handle IPv6 address in form as "[2001:4860:0:2001::68]"
lenAddr := len(addr)
if lenAddr > 0 && addr[0] == '[' && addr[lenAddr-1] == ']' {
addr = addr[1 : lenAddr-1]
lenAddr -= 2
}
if lenAddr > 0 && (!isAlphaNum(addr[0]) || !isAlphaNum(addr[len(addr)-1])) {
addr = strings.TrimSpace(addr)
}
ip := net.ParseIP(addr)
if ip != nil {
return IPAddress(ip)
}
return DomainAddress(addr)
}
var bytes0 = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
// IPAddress creates an Address with given IP.
func IPAddress(ip []byte) Address {
switch len(ip) {
case net.IPv4len:
var addr ipv4Address = [4]byte{ip[0], ip[1], ip[2], ip[3]}
return addr
case net.IPv6len:
if bytes.Equal(ip[:10], bytes0) && ip[10] == 0xff && ip[11] == 0xff {
return IPAddress(ip[12:16])
}
var addr ipv6Address = [16]byte{
ip[0], ip[1], ip[2], ip[3],
ip[4], ip[5], ip[6], ip[7],
ip[8], ip[9], ip[10], ip[11],
ip[12], ip[13], ip[14], ip[15],
}
return addr
default:
newError("invalid IP format: ", ip).AtError().WriteToLog()
return nil
}
}
// DomainAddress creates an Address with given domain.
func DomainAddress(domain string) Address {
return domainAddress(domain)
}
type ipv4Address [4]byte
func (a ipv4Address) IP() net.IP {
return net.IP(a[:])
}
func (ipv4Address) Domain() string {
panic("Calling Domain() on an IPv4Address.")
}
func (ipv4Address) Family() AddressFamily {
return AddressFamilyIPv4
}
func (a ipv4Address) String() string {
return a.IP().String()
}
type ipv6Address [16]byte
func (a ipv6Address) IP() net.IP {
return net.IP(a[:])
}
func (ipv6Address) Domain() string {
panic("Calling Domain() on an IPv6Address.")
}
func (ipv6Address) Family() AddressFamily {
return AddressFamilyIPv6
}
func (a ipv6Address) String() string {
return "[" + a.IP().String() + "]"
}
type domainAddress string
func (domainAddress) IP() net.IP {
panic("Calling IP() on a DomainAddress.")
}
func (a domainAddress) Domain() string {
return string(a)
}
func (domainAddress) Family() AddressFamily {
return AddressFamilyDomain
}
func (a domainAddress) String() string {
return a.Domain()
}
// AsAddress translates IPOrDomain to Address.
func (d *IPOrDomain) AsAddress() Address {
if d == nil {
return nil
}
switch addr := d.Address.(type) {
case *IPOrDomain_Ip:
return IPAddress(addr.Ip)
case *IPOrDomain_Domain:
return DomainAddress(addr.Domain)
}
panic("Common|Net: Invalid address.")
}
// NewIPOrDomain translates Address to IPOrDomain
func NewIPOrDomain(addr Address) *IPOrDomain {
switch addr.Family() {
case AddressFamilyDomain:
return &IPOrDomain{
Address: &IPOrDomain_Domain{
Domain: addr.Domain(),
},
}
case AddressFamilyIPv4, AddressFamilyIPv6:
return &IPOrDomain{
Address: &IPOrDomain_Ip{
Ip: addr.IP(),
},
}
default:
panic("Unknown Address type.")
}
}