mirror of
https://github.com/KusakabeShi/EtherGuard-VPN.git
synced 2024-12-01 11:43:11 +01:00
10533c3e73
Instead of hard-coding exactly two sources from which to receive packets (an IPv4 source and an IPv6 source), allow the conn.Bind to specify a set of sources. Beneficial consequences: * If there's no IPv6 support on a system, conn.Bind.Open can choose not to return a receive function for it, which is simpler than tracking that state in the bind. This simplification removes existing data races from both conn.StdNetBind and bindtest.ChannelBind. * If there are more than two sources on a system, the conn.Bind no longer needs to add a separate muxing layer. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
132 lines
3.0 KiB
Go
132 lines
3.0 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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"strconv"
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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 _ conn.Bind = (*ChannelBind)(nil)
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var _ conn.Endpoint = (*ChannelEndpoint)(nil)
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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() net.IP { return net.IPv4(127, 0, 0, 1) }
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func (c ChannelEndpoint) SrcIP() net.IP { return nil }
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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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_, port, err := net.SplitHostPort(s)
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if err != nil {
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return nil, err
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}
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i, err := strconv.ParseUint(port, 10, 16)
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if err != nil {
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return nil, err
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}
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return ChannelEndpoint(i), nil
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}
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