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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2022 WireGuard LLC. All Rights Reserved.
*/
package bindtest
import (
"fmt"
"math/rand"
"net"
"net/netip"
"os"
"golang.zx2c4.com/wireguard/conn"
)
type ChannelBind struct {
rx4, tx4 *chan []byte
rx6, tx6 *chan []byte
closeSignal chan bool
source4, source6 ChannelEndpoint
target4, target6 ChannelEndpoint
}
type ChannelEndpoint uint16
var (
_ conn.Bind = (*ChannelBind)(nil)
_ conn.Endpoint = (*ChannelEndpoint)(nil)
)
func NewChannelBinds() [2]conn.Bind {
arx4 := make(chan []byte, 8192)
brx4 := make(chan []byte, 8192)
arx6 := make(chan []byte, 8192)
brx6 := make(chan []byte, 8192)
var binds [2]ChannelBind
binds[0].rx4 = &arx4
binds[0].tx4 = &brx4
binds[1].rx4 = &brx4
binds[1].tx4 = &arx4
binds[0].rx6 = &arx6
binds[0].tx6 = &brx6
binds[1].rx6 = &brx6
binds[1].tx6 = &arx6
binds[0].target4 = ChannelEndpoint(1)
binds[1].target4 = ChannelEndpoint(2)
binds[0].target6 = ChannelEndpoint(3)
binds[1].target6 = ChannelEndpoint(4)
binds[0].source4 = binds[1].target4
binds[0].source6 = binds[1].target6
binds[1].source4 = binds[0].target4
binds[1].source6 = binds[0].target6
return [2]conn.Bind{&binds[0], &binds[1]}
}
func (c ChannelEndpoint) ClearSrc() {}
func (c ChannelEndpoint) SrcToString() string { return "" }
func (c ChannelEndpoint) DstToString() string { return fmt.Sprintf("127.0.0.1:%d", c) }
func (c ChannelEndpoint) DstToBytes() []byte { return []byte{byte(c)} }
func (c ChannelEndpoint) DstIP() netip.Addr { return netip.AddrFrom4([4]byte{127, 0, 0, 1}) }
func (c ChannelEndpoint) SrcIP() netip.Addr { return netip.Addr{} }
func (c *ChannelBind) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
c.closeSignal = make(chan bool)
fns = append(fns, c.makeReceiveFunc(*c.rx4))
fns = append(fns, c.makeReceiveFunc(*c.rx6))
if rand.Uint32()&1 == 0 {
return fns, uint16(c.source4), nil
} else {
return fns, uint16(c.source6), nil
}
}
func (c *ChannelBind) Close() error {
if c.closeSignal != nil {
select {
case <-c.closeSignal:
default:
close(c.closeSignal)
}
}
return nil
}
func (c *ChannelBind) SetMark(mark uint32) error { return nil }
func (c *ChannelBind) makeReceiveFunc(ch chan []byte) conn.ReceiveFunc {
return func(b []byte) (n int, ep conn.Endpoint, err error) {
select {
case <-c.closeSignal:
return 0, nil, net.ErrClosed
case rx := <-ch:
return copy(b, rx), c.target6, nil
}
}
}
func (c *ChannelBind) Send(b []byte, ep conn.Endpoint) error {
select {
case <-c.closeSignal:
return net.ErrClosed
default:
bc := make([]byte, len(b))
copy(bc, b)
if ep.(ChannelEndpoint) == c.target4 {
*c.tx4 <- bc
} else if ep.(ChannelEndpoint) == c.target6 {
*c.tx6 <- bc
} else {
return os.ErrInvalid
}
}
return nil
}
func (c *ChannelBind) ParseEndpoint(s string) (conn.Endpoint, error) {
addr, err := netip.ParseAddrPort(s)
if err != nil {
return nil, err
}
return ChannelEndpoint(addr.Port()), nil
}
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