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v1.go
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v1.go
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package proxyproto
import (
"bufio"
"bytes"
"net"
"strconv"
"strings"
)
const (
CRLF = "\r\n"
SEPARATOR = " "
)
func initVersion1() *Header {
header := new(Header)
header.Version = 1
// Command doesn't exist in v1
header.Command = PROXY
return header
}
func parseVersion1(reader *bufio.Reader) (*Header, error) {
// Make sure we have a v1 header
line, err := reader.ReadString('\n')
if !strings.HasSuffix(line, CRLF) {
return nil, ErrCantReadProtocolVersionAndCommand
}
tokens := strings.Split(line[:len(line)-2], SEPARATOR)
if len(tokens) < 6 {
return nil, ErrCantReadProtocolVersionAndCommand
}
header := initVersion1()
// Read address family and protocol
switch tokens[1] {
case "TCP4":
header.TransportProtocol = TCPv4
case "TCP6":
header.TransportProtocol = TCPv6
default:
header.TransportProtocol = UNSPEC
}
// Read addresses and ports
header.SourceAddress, err = parseV1IPAddress(header.TransportProtocol, tokens[2])
if err != nil {
return nil, err
}
header.DestinationAddress, err = parseV1IPAddress(header.TransportProtocol, tokens[3])
if err != nil {
return nil, err
}
header.SourcePort, err = parseV1PortNumber(tokens[4])
if err != nil {
return nil, err
}
header.DestinationPort, err = parseV1PortNumber(tokens[5])
if err != nil {
return nil, err
}
return header, nil
}
func (header *Header) formatVersion1() ([]byte, error) {
// As of version 1, only "TCP4" ( \x54 \x43 \x50 \x34 ) for TCP over IPv4,
// and "TCP6" ( \x54 \x43 \x50 \x36 ) for TCP over IPv6 are allowed.
proto := "UNKNOWN"
if header.TransportProtocol == TCPv4 {
proto = "TCP4"
} else if header.TransportProtocol == TCPv6 {
proto = "TCP6"
}
var buf bytes.Buffer
buf.Write(SIGV1)
buf.WriteString(SEPARATOR)
buf.WriteString(proto)
buf.WriteString(SEPARATOR)
buf.WriteString(header.SourceAddress.String())
buf.WriteString(SEPARATOR)
buf.WriteString(header.DestinationAddress.String())
buf.WriteString(SEPARATOR)
buf.WriteString(strconv.Itoa(int(header.SourcePort)))
buf.WriteString(SEPARATOR)
buf.WriteString(strconv.Itoa(int(header.DestinationPort)))
buf.WriteString(CRLF)
return buf.Bytes(), nil
}
func parseV1PortNumber(portStr string) (port uint16, err error) {
_port, _err := strconv.Atoi(portStr)
if _err == nil {
if _port < 0 || _port > 65535 {
err = ErrInvalidPortNumber
} else {
port = uint16(_port)
}
} else {
err = ErrInvalidPortNumber
}
return
}
func parseV1IPAddress(protocol AddressFamilyAndProtocol, addrStr string) (addr net.IP, err error) {
addr = net.ParseIP(addrStr)
tryV4 := addr.To4()
if (protocol == TCPv4 && tryV4 == nil) || (protocol == TCPv6 && tryV4 != nil) {
err = ErrInvalidAddress
}
return
}