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HandleConn: propagate src IP via context #48

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HandleConn: propagate src IP via context #48

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8 changes: 7 additions & 1 deletion tcpproxy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,12 @@ type Target interface {
HandleConn(net.Conn)
}

type contextKey struct{}

// SourceAddrContextKey is the context key used by DialProxy.HandleConn to
// pass the incoming connection's remote address (net.Addr) to DialContext.
var SourceAddrContextKey = contextKey{}

// To is shorthand way of writing &tcpproxy.DialProxy{Addr: addr}.
func To(addr string) *DialProxy {
return &DialProxy{Addr: addr}
Expand Down Expand Up @@ -374,7 +380,7 @@ func closeWrite(c net.Conn) {

// HandleConn implements the Target interface.
func (dp *DialProxy) HandleConn(src net.Conn) {
ctx := context.Background()
ctx := context.WithValue(context.Background(), SourceAddrContextKey, src.RemoteAddr())
var cancel context.CancelFunc
if dp.DialTimeout >= 0 {
ctx, cancel = context.WithTimeout(ctx, dp.dialTimeout())
Expand Down