frp/vendor/github.com/pires/go-proxyproto/addr_proto.go

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2019-04-10 02:53:45 +00:00
package proxyproto
// AddressFamilyAndProtocol represents address family and transport protocol.
type AddressFamilyAndProtocol byte
const (
UNSPEC = '\x00'
TCPv4 = '\x11'
UDPv4 = '\x12'
TCPv6 = '\x21'
UDPv6 = '\x22'
UnixStream = '\x31'
UnixDatagram = '\x32'
)
var supportedTransportProtocol = map[AddressFamilyAndProtocol]bool{
TCPv4: true,
UDPv4: true,
TCPv6: true,
UDPv6: true,
UnixStream: true,
UnixDatagram: true,
}
// IsIPv4 returns true if the address family is IPv4 (AF_INET4), false otherwise.
func (ap AddressFamilyAndProtocol) IsIPv4() bool {
return 0x10 == ap&0xF0
}
// IsIPv6 returns true if the address family is IPv6 (AF_INET6), false otherwise.
func (ap AddressFamilyAndProtocol) IsIPv6() bool {
return 0x20 == ap&0xF0
}
// IsUnix returns true if the address family is UNIX (AF_UNIX), false otherwise.
func (ap AddressFamilyAndProtocol) IsUnix() bool {
return 0x30 == ap&0xF0
}
// IsStream returns true if the transport protocol is TCP or STREAM (SOCK_STREAM), false otherwise.
func (ap AddressFamilyAndProtocol) IsStream() bool {
return 0x01 == ap&0x0F
}
// IsDatagram returns true if the transport protocol is UDP or DGRAM (SOCK_DGRAM), false otherwise.
func (ap AddressFamilyAndProtocol) IsDatagram() bool {
return 0x02 == ap&0x0F
}
// IsUnspec returns true if the transport protocol or address family is unspecified, false otherwise.
func (ap AddressFamilyAndProtocol) IsUnspec() bool {
return (0x00 == ap&0xF0) || (0x00 == ap&0x0F)
}
func (ap AddressFamilyAndProtocol) toByte() byte {
if ap.IsIPv4() && ap.IsStream() {
return TCPv4
} else if ap.IsIPv4() && ap.IsDatagram() {
return UDPv4
} else if ap.IsIPv6() && ap.IsStream() {
return TCPv6
} else if ap.IsIPv6() && ap.IsDatagram() {
return UDPv6
} else if ap.IsUnix() && ap.IsStream() {
return UnixStream
} else if ap.IsUnix() && ap.IsDatagram() {
return UnixDatagram
}
return UNSPEC
}