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v2fly/common/net/address.go

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package net
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import (
"net"
"strconv"
"github.com/v2ray/v2ray-core/common/log"
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)
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// 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 {
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IP() net.IP // IP of this Address
Domain() string // Domain of this Address
Port() uint16 // Port of this Address
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PortBytes() []byte // Port in bytes, network byte order
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IsIPv4() bool // True if this Address is an IPv4 address
IsIPv6() bool // True if this Address is an IPv6 address
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IsDomain() bool // True if this Address is an domain address
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String() string // String representation of this Address
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}
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func allZeros(data []byte) bool {
for _, v := range data {
if v != 0 {
return false
}
}
return true
}
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// IPAddress creates an Address with given IP and port.
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func IPAddress(ip []byte, port uint16) Address {
switch len(ip) {
case net.IPv4len:
return IPv4Address{
PortAddress: PortAddress{port: port},
ip: [4]byte{ip[0], ip[1], ip[2], ip[3]},
}
case net.IPv6len:
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if allZeros(ip[0:10]) && ip[10] == 0xff && ip[11] == 0xff {
return IPAddress(ip[12:16], port)
}
return IPv6Address{
PortAddress: PortAddress{port: port},
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ip: [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],
},
}
default:
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log.Error("Invalid IP format: %v", ip)
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return nil
}
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}
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// DomainAddress creates an Address with given domain and port.
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func DomainAddress(domain string, port uint16) Address {
return DomainAddressImpl{
domain: domain,
PortAddress: PortAddress{port: port},
}
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}
type PortAddress struct {
port uint16
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}
func (addr PortAddress) Port() uint16 {
return addr.port
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}
func (addr PortAddress) PortBytes() []byte {
return []byte{byte(addr.port >> 8), byte(addr.port)}
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}
type IPv4Address struct {
PortAddress
ip [4]byte
}
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func (addr IPv4Address) IP() net.IP {
return net.IP(addr.ip[:])
}
func (addr IPv4Address) Domain() string {
panic("Calling Domain() on an IPv4Address.")
}
func (addr IPv4Address) IsIPv4() bool {
return true
}
func (addr IPv4Address) IsIPv6() bool {
return false
}
func (addr IPv4Address) IsDomain() bool {
return false
}
func (addr IPv4Address) String() string {
return addr.IP().String() + ":" + strconv.Itoa(int(addr.PortAddress.port))
}
type IPv6Address struct {
PortAddress
ip [16]byte
}
func (addr IPv6Address) IP() net.IP {
return net.IP(addr.ip[:])
}
func (addr IPv6Address) Domain() string {
panic("Calling Domain() on an IPv6Address.")
}
func (addr IPv6Address) IsIPv4() bool {
return false
}
func (addr IPv6Address) IsIPv6() bool {
return true
}
func (addr IPv6Address) IsDomain() bool {
return false
}
func (addr IPv6Address) String() string {
return "[" + addr.IP().String() + "]:" + strconv.Itoa(int(addr.PortAddress.port))
}
type DomainAddressImpl struct {
PortAddress
domain string
}
func (addr DomainAddressImpl) IP() net.IP {
panic("Calling IP() on a DomainAddress.")
}
func (addr DomainAddressImpl) Domain() string {
return addr.domain
}
func (addr DomainAddressImpl) IsIPv4() bool {
return false
}
func (addr DomainAddressImpl) IsIPv6() bool {
return false
}
func (addr DomainAddressImpl) IsDomain() bool {
return true
}
func (addr DomainAddressImpl) String() string {
return addr.domain + ":" + strconv.Itoa(int(addr.PortAddress.port))
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}