130 lines
3 KiB
Go
130 lines
3 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package bindtest
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import (
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"fmt"
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"math/rand"
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"net"
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"os"
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"golang.zx2c4.com/go118/netip"
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"golang.zx2c4.com/wireguard/conn"
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)
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type ChannelBind struct {
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rx4, tx4 *chan []byte
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rx6, tx6 *chan []byte
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closeSignal chan bool
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source4, source6 ChannelEndpoint
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target4, target6 ChannelEndpoint
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}
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type ChannelEndpoint uint16
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var (
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_ conn.Bind = (*ChannelBind)(nil)
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_ conn.Endpoint = (*ChannelEndpoint)(nil)
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)
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func NewChannelBinds() [2]conn.Bind {
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arx4 := make(chan []byte, 8192)
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brx4 := make(chan []byte, 8192)
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arx6 := make(chan []byte, 8192)
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brx6 := make(chan []byte, 8192)
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var binds [2]ChannelBind
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binds[0].rx4 = &arx4
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binds[0].tx4 = &brx4
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binds[1].rx4 = &brx4
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binds[1].tx4 = &arx4
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binds[0].rx6 = &arx6
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binds[0].tx6 = &brx6
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binds[1].rx6 = &brx6
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binds[1].tx6 = &arx6
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binds[0].target4 = ChannelEndpoint(1)
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binds[1].target4 = ChannelEndpoint(2)
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binds[0].target6 = ChannelEndpoint(3)
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binds[1].target6 = ChannelEndpoint(4)
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binds[0].source4 = binds[1].target4
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binds[0].source6 = binds[1].target6
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binds[1].source4 = binds[0].target4
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binds[1].source6 = binds[0].target6
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return [2]conn.Bind{&binds[0], &binds[1]}
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}
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func (c ChannelEndpoint) ClearSrc() {}
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func (c ChannelEndpoint) SrcToString() string { return "" }
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func (c ChannelEndpoint) DstToString() string { return fmt.Sprintf("127.0.0.1:%d", c) }
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func (c ChannelEndpoint) DstToBytes() []byte { return []byte{byte(c)} }
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func (c ChannelEndpoint) DstIP() netip.Addr { return netip.AddrFrom4([4]byte{127, 0, 0, 1}) }
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func (c ChannelEndpoint) SrcIP() netip.Addr { return netip.Addr{} }
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func (c *ChannelBind) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
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c.closeSignal = make(chan bool)
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fns = append(fns, c.makeReceiveFunc(*c.rx4))
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fns = append(fns, c.makeReceiveFunc(*c.rx6))
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if rand.Uint32()&1 == 0 {
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return fns, uint16(c.source4), nil
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} else {
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return fns, uint16(c.source6), nil
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}
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}
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func (c *ChannelBind) Close() error {
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if c.closeSignal != nil {
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select {
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case <-c.closeSignal:
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default:
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close(c.closeSignal)
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}
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}
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return nil
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}
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func (c *ChannelBind) SetMark(mark uint32) error { return nil }
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func (c *ChannelBind) makeReceiveFunc(ch chan []byte) conn.ReceiveFunc {
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return func(b []byte) (n int, ep conn.Endpoint, err error) {
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select {
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case <-c.closeSignal:
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return 0, nil, net.ErrClosed
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case rx := <-ch:
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return copy(b, rx), c.target6, nil
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}
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}
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}
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func (c *ChannelBind) Send(b []byte, ep conn.Endpoint) error {
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select {
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case <-c.closeSignal:
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return net.ErrClosed
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default:
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bc := make([]byte, len(b))
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copy(bc, b)
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if ep.(ChannelEndpoint) == c.target4 {
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*c.tx4 <- bc
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} else if ep.(ChannelEndpoint) == c.target6 {
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*c.tx6 <- bc
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} else {
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return os.ErrInvalid
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}
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}
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return nil
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}
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func (c *ChannelBind) ParseEndpoint(s string) (conn.Endpoint, error) {
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addr, err := netip.ParseAddrPort(s)
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if err != nil {
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return nil, err
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}
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return ChannelEndpoint(addr.Port()), nil
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}
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