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