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addr.go
61 lines (55 loc) · 1.29 KB
/
addr.go
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package socks
import (
"encoding/binary"
"io"
"net/netip"
"github.com/ringo-is-a-color/heteroglossia/transport"
"github.com/ringo-is-a-color/heteroglossia/util/errors"
"github.com/ringo-is-a-color/heteroglossia/util/ioutil"
)
const (
ConnectionAddressIpv4 byte = 1
ConnectionAddressIpv6 byte = 4
ConnectionAddressDomain byte = 3
)
func ReadSOCKS5Address(r io.Reader) (dest *transport.SocketAddress, err error) {
addressType, err := ioutil.Read1(r)
if err != nil {
return
}
var ip *netip.Addr
var domain string
switch addressType {
case ConnectionAddressIpv4:
ipv4, err := ioutil.ReadN(r, 4)
if err != nil {
return nil, err
}
addr := netip.AddrFrom4([4]byte(ipv4))
ip = &addr
case ConnectionAddressIpv6:
ipv6, err := ioutil.ReadN(r, 16)
if err != nil {
return nil, err
}
addr := netip.AddrFrom16([16]byte(ipv6))
ip = &addr
case ConnectionAddressDomain:
domain, err = ioutil.ReadStringByUint8(r)
if err != nil {
return nil, err
}
default:
err = errors.Newf("unknown address type %v", addressType)
return
}
portBs, err := ioutil.ReadN(r, 2)
if err != nil {
return
}
port := binary.BigEndian.Uint16(portBs)
if ip != nil {
return transport.NewSocketAddressByIP(ip, port), nil
}
return transport.NewSocketAddressByDomain(domain, port), nil
}