telebit/mplexer/routemux.go

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package telebit
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import (
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"fmt"
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"io"
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"net"
"strconv"
"strings"
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"time"
)
// A RouteMux is a net.Conn multiplexer.
//
// It matches the port, domain, or connection type of a connection
// and selects the matching handler.
type RouteMux struct {
defaultTimeout time.Duration
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routes []meta
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}
type meta struct {
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addr string
handler Handler
terminate bool
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}
// NewRouteMux allocates and returns a new RouteMux.
func NewRouteMux() *RouteMux {
mux := &RouteMux{
defaultTimeout: 45 * time.Second,
}
return mux
}
// Serve dispatches the connection to the handler whose selectors matches the attributes.
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func (m *RouteMux) Serve(client net.Conn) error {
var wconn *ConnWrap
switch conn := client.(type) {
case *ConnWrap:
wconn = conn
default:
wconn = &ConnWrap{Conn: client}
}
var servername string
var port string
// TODO go back to Servername on conn, but with SNI
//servername := wconn.Servername()
fam := wconn.LocalAddr().Network()
if "tun" == fam {
switch laddr := wconn.LocalAddr().(type) {
case *Addr:
servername = laddr.Hostname()
port = ":" + strconv.Itoa(laddr.Port())
default:
panic("impossible type switch: Addr is 'tun' but didn't match")
}
} else {
// TODO make an AddrWrap to do this switch
addr := wconn.LocalAddr().String()
parts := strings.Split(addr, ":")
port = ":" + parts[len(parts)-1]
servername = strings.Join(parts[:len(parts)-1], ":")
}
fmt.Println("Addr:", fam, servername, port)
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for _, meta := range m.routes {
// TODO '*.example.com'
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if meta.terminate {
servername = wconn.Servername()
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}
fmt.Println("Meta:", meta.addr, servername)
if servername == meta.addr || "*" == meta.addr || port == meta.addr {
//fmt.Println("[debug] test of route:", meta)
if err := meta.handler.Serve(wconn); nil != err {
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// error should be EOF if successful
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return err
}
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// nil err means skipped
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}
}
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fmt.Println("No match found for", wconn.Scheme(), wconn.Servername())
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return client.Close()
}
// ForwardTCP creates and returns a connection to a local handler target.
func (m *RouteMux) ForwardTCP(servername string, target string, timeout time.Duration) error {
// TODO check servername
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m.routes = append(m.routes, meta{
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addr: servername,
terminate: false,
handler: NewForwarder(target, timeout),
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})
return nil
}
// HandleTCP creates and returns a connection to a local handler target.
func (m *RouteMux) HandleTCP(servername string, handler Handler) error {
// TODO check servername
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m.routes = append(m.routes, meta{
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addr: servername,
terminate: false,
handler: handler,
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})
return nil
}
// HandleTLS creates and returns a connection to a local handler target.
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func (m *RouteMux) HandleTLS(servername string, acme *ACME, handler Handler) error {
// TODO check servername
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m.routes = append(m.routes, meta{
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addr: servername,
terminate: true,
handler: HandlerFunc(func(client net.Conn) error {
var wconn *ConnWrap
switch conn := client.(type) {
case *ConnWrap:
wconn = conn
default:
panic("HandleTLS is special in that it must receive &ConnWrap{ Conn: conn }")
}
if wconn.isTerminated() {
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// nil to skip
return nil
}
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//NewTerminator(acme, handler)(client)
//return handler.Serve(client)
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err := handler.Serve(TerminateTLS(wconn, acme))
if nil == err || io.EOF == err {
return io.EOF
}
return err
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}),
})
return nil
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}