mirror of
https://github.com/daeuniverse/dae.git
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94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
/*
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* SPDX-License-Identifier: AGPL-3.0-only
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* Copyright (c) since 2022, v2rayA Organization <team@v2raya.org>
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*/
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package control
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/mzz2017/softwind/pkg/zeroalloc/io"
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"github.com/v2rayA/dae/common"
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"github.com/v2rayA/dae/common/consts"
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"golang.org/x/sys/unix"
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"net"
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"net/netip"
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"time"
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)
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func (c *ControlPlane) handleConn(lConn net.Conn) (err error) {
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defer lConn.Close()
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rAddr := lConn.RemoteAddr().(*net.TCPAddr).AddrPort()
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ip6 := rAddr.Addr().As16()
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var value bpfIpPortOutbound
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if err := c.bpf.DstMap.Lookup(bpfIpPortProto{
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Ip: common.Ipv6ByteSliceToUint32Array(ip6[:]),
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Port: swap16(rAddr.Port()),
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Proto: unix.IPPROTO_TCP,
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}, &value); err != nil {
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return fmt.Errorf("reading map: key %v: %w", rAddr.String(), err)
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}
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var dstIP [4]byte
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binary.LittleEndian.PutUint32(dstIP[:], value.Ip[3])
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dst := netip.AddrPortFrom(netip.AddrFrom4(dstIP), swap16(value.Port))
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switch consts.OutboundIndex(value.Outbound) {
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case consts.OutboundDirect:
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case consts.OutboundControlPlaneDirect:
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value.Outbound = uint8(consts.OutboundDirect)
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c.log.Debugf("outbound: %v => %v",
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consts.OutboundControlPlaneDirect.String(),
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consts.OutboundIndex(value.Outbound).String(),
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)
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default:
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}
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outbound := c.outbounds[value.Outbound]
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// TODO: Set-up ip to domain mapping and show domain if possible.
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c.log.Infof("TCP: %v <-[%v]-> %v", lConn.RemoteAddr(), outbound.Name, dst.String())
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if value.Outbound < 0 || int(value.Outbound) >= len(c.outbounds) {
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return fmt.Errorf("outbound id from bpf is out of range: %v not in [0, %v]", value.Outbound, len(c.outbounds)-1)
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}
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rConn, err := outbound.Dial("tcp", dst.String())
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if err != nil {
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return fmt.Errorf("failed to dial %v: %w", dst, err)
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}
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defer rConn.Close()
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if err = RelayTCP(lConn, rConn); err != nil {
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var netErr net.Error
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if errors.As(err, &netErr) && netErr.Timeout() {
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return nil // ignore i/o timeout
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}
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return fmt.Errorf("handleTCP relay error: %w", err)
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}
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return nil
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}
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type WriteCloser interface {
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CloseWrite() error
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}
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func RelayTCP(lConn, rConn net.Conn) (err error) {
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eCh := make(chan error, 1)
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go func() {
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_, e := io.Copy(rConn, lConn)
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if rConn, ok := rConn.(WriteCloser); ok {
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rConn.CloseWrite()
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}
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rConn.SetReadDeadline(time.Now().Add(10 * time.Second))
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eCh <- e
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}()
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_, e := io.Copy(lConn, rConn)
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if lConn, ok := lConn.(WriteCloser); ok {
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lConn.CloseWrite()
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}
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lConn.SetReadDeadline(time.Now().Add(10 * time.Second))
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if e != nil {
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<-eCh
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return e
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}
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return <-eCh
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}
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