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bind.go
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bind.go
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package wireguard
import (
"context"
"errors"
"io"
"net"
"net/netip"
"strconv"
"sync"
"golang.zx2c4.com/wireguard/conn"
xnet "github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/transport/internet"
)
type netReadInfo struct {
// status
waiter sync.WaitGroup
// param
buff []byte
// result
bytes int
endpoint conn.Endpoint
err error
}
// reduce duplicated code
type netBind struct {
dns dns.Client
dnsOption dns.IPOption
workers int
readQueue chan *netReadInfo
}
// SetMark implements conn.Bind
func (bind *netBind) SetMark(mark uint32) error {
return nil
}
// ParseEndpoint implements conn.Bind
func (n *netBind) ParseEndpoint(s string) (conn.Endpoint, error) {
ipStr, port, err := net.SplitHostPort(s)
if err != nil {
return nil, err
}
portNum, err := strconv.Atoi(port)
if err != nil {
return nil, err
}
addr := xnet.ParseAddress(ipStr)
if addr.Family() == xnet.AddressFamilyDomain {
ips, err := n.dns.LookupIP(addr.Domain(), n.dnsOption)
if err != nil {
return nil, err
} else if len(ips) == 0 {
return nil, dns.ErrEmptyResponse
}
addr = xnet.IPAddress(ips[0])
}
dst := xnet.Destination{
Address: addr,
Port: xnet.Port(portNum),
Network: xnet.Network_UDP,
}
return &netEndpoint{
dst: dst,
}, nil
}
// BatchSize implements conn.Bind
func (bind *netBind) BatchSize() int {
return 1
}
// Open implements conn.Bind
func (bind *netBind) Open(uport uint16) ([]conn.ReceiveFunc, uint16, error) {
bind.readQueue = make(chan *netReadInfo)
fun := func(bufs [][]byte, sizes []int, eps []conn.Endpoint) (n int, err error) {
defer func() {
if r := recover(); r != nil {
n = 0
err = errors.New("channel closed")
}
}()
r := &netReadInfo{
buff: bufs[0],
}
r.waiter.Add(1)
bind.readQueue <- r
r.waiter.Wait() // wait read goroutine done, or we will miss the result
sizes[0], eps[0] = r.bytes, r.endpoint
return 1, r.err
}
workers := bind.workers
if workers <= 0 {
workers = 1
}
arr := make([]conn.ReceiveFunc, workers)
for i := 0; i < workers; i++ {
arr[i] = fun
}
return arr, uint16(uport), nil
}
// Close implements conn.Bind
func (bind *netBind) Close() error {
if bind.readQueue != nil {
close(bind.readQueue)
}
return nil
}
type netBindClient struct {
netBind
dialer internet.Dialer
reserved []byte
}
func (bind *netBindClient) connectTo(endpoint *netEndpoint) error {
c, err := bind.dialer.Dial(context.Background(), endpoint.dst)
if err != nil {
return err
}
endpoint.conn = c
go func(readQueue <-chan *netReadInfo, endpoint *netEndpoint) {
for {
v, ok := <-readQueue
if !ok {
return
}
i, err := c.Read(v.buff)
if i > 3 {
v.buff[1] = 0
v.buff[2] = 0
v.buff[3] = 0
}
v.bytes = i
v.endpoint = endpoint
v.err = err
v.waiter.Done()
if err != nil && errors.Is(err, io.EOF) {
endpoint.conn = nil
return
}
}
}(bind.readQueue, endpoint)
return nil
}
func (bind *netBindClient) Send(buff [][]byte, endpoint conn.Endpoint) error {
var err error
nend, ok := endpoint.(*netEndpoint)
if !ok {
return conn.ErrWrongEndpointType
}
if nend.conn == nil {
err = bind.connectTo(nend)
if err != nil {
return err
}
}
for _, buff := range buff {
if len(buff) > 3 && len(bind.reserved) == 3 {
copy(buff[1:], bind.reserved)
}
if _, err = nend.conn.Write(buff); err != nil {
return err
}
}
return nil
}
type netBindServer struct {
netBind
}
func (bind *netBindServer) Send(buff [][]byte, endpoint conn.Endpoint) error {
var err error
nend, ok := endpoint.(*netEndpoint)
if !ok {
return conn.ErrWrongEndpointType
}
if nend.conn == nil {
return newError("connection not open yet")
}
for _, buff := range buff {
if _, err = nend.conn.Write(buff); err != nil {
return err
}
}
return err
}
type netEndpoint struct {
dst xnet.Destination
conn net.Conn
}
func (netEndpoint) ClearSrc() {}
func (e netEndpoint) DstIP() netip.Addr {
return netip.Addr{}
}
func (e netEndpoint) SrcIP() netip.Addr {
return netip.Addr{}
}
func (e netEndpoint) DstToBytes() []byte {
var dat []byte
if e.dst.Address.Family().IsIPv4() {
dat = e.dst.Address.IP().To4()[:]
} else {
dat = e.dst.Address.IP().To16()[:]
}
dat = append(dat, byte(e.dst.Port), byte(e.dst.Port>>8))
return dat
}
func (e netEndpoint) DstToString() string {
return e.dst.NetAddr()
}
func (e netEndpoint) SrcToString() string {
return ""
}
func toNetIpAddr(addr xnet.Address) netip.Addr {
if addr.Family().IsIPv4() {
ip := addr.IP()
return netip.AddrFrom4([4]byte{ip[0], ip[1], ip[2], ip[3]})
} else {
ip := addr.IP()
arr := [16]byte{}
for i := 0; i < 16; i++ {
arr[i] = ip[i]
}
return netip.AddrFrom16(arr)
}
}