sing-box/inbound/default_tcp.go

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package inbound
import (
"context"
"net"
"github.com/sagernet/sing-box/adapter"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing/common/control"
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E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
func (a *myInboundAdapter) ListenTCP() (net.Listener, error) {
var err error
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bindAddr := M.SocksaddrFrom(a.listenOptions.Listen.Build(), a.listenOptions.ListenPort)
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var tcpListener net.Listener
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var listenConfig net.ListenConfig
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// TODO: Add an option to customize the keep alive period
listenConfig.KeepAlive = C.TCPKeepAliveInitial
listenConfig.Control = control.Append(listenConfig.Control, control.SetKeepAlivePeriod(C.TCPKeepAliveInitial, C.TCPKeepAliveInterval))
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if a.listenOptions.TCPMultiPath {
if !go121Available {
return nil, E.New("MultiPath TCP requires go1.21, please recompile your binary.")
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}
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setMultiPathTCP(&listenConfig)
}
if a.listenOptions.TCPFastOpen {
if !go120Available {
return nil, E.New("TCP Fast Open requires go1.20, please recompile your binary.")
}
tcpListener, err = listenTFO(listenConfig, a.ctx, M.NetworkFromNetAddr(N.NetworkTCP, bindAddr.Addr), bindAddr.String())
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} else {
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tcpListener, err = listenConfig.Listen(a.ctx, M.NetworkFromNetAddr(N.NetworkTCP, bindAddr.Addr), bindAddr.String())
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}
if err == nil {
a.logger.Info("tcp server started at ", tcpListener.Addr())
}
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if a.listenOptions.ProxyProtocol || a.listenOptions.ProxyProtocolAcceptNoHeader {
return nil, E.New("Proxy Protocol is deprecated and removed in sing-box 1.6.0")
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}
a.tcpListener = tcpListener
return tcpListener, err
}
func (a *myInboundAdapter) loopTCPIn() {
tcpListener := a.tcpListener
for {
conn, err := tcpListener.Accept()
if err != nil {
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//goland:noinspection GoDeprecation
//nolint:staticcheck
if netError, isNetError := err.(net.Error); isNetError && netError.Temporary() {
a.logger.Error(err)
continue
}
if a.inShutdown.Load() && E.IsClosed(err) {
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return
}
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a.tcpListener.Close()
a.logger.Error("serve error: ", err)
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continue
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}
go a.injectTCP(conn, adapter.InboundContext{})
}
}
func (a *myInboundAdapter) injectTCP(conn net.Conn, metadata adapter.InboundContext) {
ctx := log.ContextWithNewID(a.ctx)
metadata = a.createMetadata(conn, metadata)
a.logger.InfoContext(ctx, "inbound connection from ", metadata.Source)
hErr := a.connHandler.NewConnection(ctx, conn, metadata)
if hErr != nil {
conn.Close()
a.NewError(ctx, E.Cause(hErr, "process connection from ", metadata.Source))
}
}
func (a *myInboundAdapter) routeTCP(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) {
a.logger.InfoContext(ctx, "inbound connection from ", metadata.Source)
hErr := a.newConnection(ctx, conn, metadata)
if hErr != nil {
conn.Close()
a.NewError(ctx, E.Cause(hErr, "process connection from ", metadata.Source))
}
}