81 lines
2.7 KiB
Go
81 lines
2.7 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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// AddressFamilyAndProtocol enum values.
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const (
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UNSPEC AddressFamilyAndProtocol = '\x00'
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TCPv4 AddressFamilyAndProtocol = '\x11'
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UDPv4 AddressFamilyAndProtocol = '\x12'
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TCPv6 AddressFamilyAndProtocol = '\x21'
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UDPv6 AddressFamilyAndProtocol = '\x22'
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UnixStream AddressFamilyAndProtocol = '\x31'
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UnixDatagram AddressFamilyAndProtocol = '\x32'
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)
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// supportedTransportProtocol is the set of address-family/transport-protocol
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// bytes defined by the PROXY protocol v2 spec (section 2.2). Any other value is
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// rejected during v2 parsing. This matters for bytes that share a known family
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// but an undefined transport (e.g. 0x13: IPv4 family, transport 3): they pass
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// the IsIPv4/IsIPv6 family checks yet are neither stream nor datagram, so
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// newIPAddr would return a nil net.Addr and later panic callers of
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// RemoteAddr().String() / LocalAddr().String().
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var supportedTransportProtocol = map[AddressFamilyAndProtocol]bool{
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UNSPEC: true,
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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 ap&0xF0 == 0x10
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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 ap&0xF0 == 0x20
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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 ap&0xF0 == 0x30
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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 ap&0x0F == 0x01
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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 ap&0x0F == 0x02
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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 (ap&0xF0 == 0x00) || (ap&0x0F == 0x00)
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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 byte(TCPv4)
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} else if ap.IsIPv4() && ap.IsDatagram() {
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return byte(UDPv4)
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} else if ap.IsIPv6() && ap.IsStream() {
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return byte(TCPv6)
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} else if ap.IsIPv6() && ap.IsDatagram() {
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return byte(UDPv6)
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} else if ap.IsUnix() && ap.IsStream() {
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return byte(UnixStream)
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} else if ap.IsUnix() && ap.IsDatagram() {
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return byte(UnixDatagram)
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}
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return byte(UNSPEC)
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}
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