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listener.go
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listener.go
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package websocket
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"strings"
"github.com/libp2p/go-libp2p/core/transport"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
)
type listener struct {
nl net.Listener
server http.Server
// The Go standard library sets the http.Server.TLSConfig no matter if this is a WS or WSS,
// so we can't rely on checking if server.TLSConfig is set.
isWss bool
laddr ma.Multiaddr
closed chan struct{}
incoming chan *Conn
}
func (pwma *parsedWebsocketMultiaddr) toMultiaddr() ma.Multiaddr {
if !pwma.isWSS {
return pwma.restMultiaddr.Encapsulate(wsComponent)
}
if pwma.sni == nil {
return pwma.restMultiaddr.Encapsulate(tlsComponent).Encapsulate(wsComponent)
}
return pwma.restMultiaddr.Encapsulate(tlsComponent).Encapsulate(pwma.sni).Encapsulate(wsComponent)
}
// newListener creates a new listener from a raw net.Listener.
// tlsConf may be nil (for unencrypted websockets).
func newListener(a ma.Multiaddr, tlsConf *tls.Config) (*listener, error) {
parsed, err := parseWebsocketMultiaddr(a)
if err != nil {
return nil, err
}
if parsed.isWSS && tlsConf == nil {
return nil, fmt.Errorf("cannot listen on wss address %s without a tls.Config", a)
}
lnet, lnaddr, err := manet.DialArgs(parsed.restMultiaddr)
if err != nil {
return nil, err
}
nl, err := net.Listen(lnet, lnaddr)
if err != nil {
return nil, err
}
laddr, err := manet.FromNetAddr(nl.Addr())
if err != nil {
return nil, err
}
first, _ := ma.SplitFirst(a)
// Don't resolve dns addresses.
// We want to be able to announce domain names, so the peer can validate the TLS certificate.
if c := first.Protocol().Code; c == ma.P_DNS || c == ma.P_DNS4 || c == ma.P_DNS6 || c == ma.P_DNSADDR {
_, last := ma.SplitFirst(laddr)
laddr = first.Encapsulate(last)
}
parsed.restMultiaddr = laddr
ln := &listener{
nl: nl,
laddr: parsed.toMultiaddr(),
incoming: make(chan *Conn),
closed: make(chan struct{}),
}
ln.server = http.Server{Handler: ln}
if parsed.isWSS {
ln.isWss = true
ln.server.TLSConfig = tlsConf
}
return ln, nil
}
func (l *listener) serve() {
defer close(l.closed)
if !l.isWss {
l.server.Serve(l.nl)
} else {
l.server.ServeTLS(l.nl, "", "")
}
}
func (l *listener) ServeHTTP(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
// The upgrader writes a response for us.
return
}
select {
case l.incoming <- NewConn(c, l.isWss):
case <-l.closed:
c.Close()
}
// The connection has been hijacked, it's safe to return.
}
func (l *listener) Accept() (manet.Conn, error) {
select {
case c, ok := <-l.incoming:
if !ok {
return nil, transport.ErrListenerClosed
}
mnc, err := manet.WrapNetConn(c)
if err != nil {
c.Close()
return nil, err
}
return mnc, nil
case <-l.closed:
return nil, transport.ErrListenerClosed
}
}
func (l *listener) Addr() net.Addr {
return l.nl.Addr()
}
func (l *listener) Close() error {
l.server.Close()
err := l.nl.Close()
<-l.closed
if strings.Contains(err.Error(), "use of closed network connection") {
return transport.ErrListenerClosed
}
return err
}
func (l *listener) Multiaddr() ma.Multiaddr {
return l.laddr
}
type transportListener struct {
transport.Listener
}
func (l *transportListener) Accept() (transport.CapableConn, error) {
conn, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return &capableConn{CapableConn: conn}, nil
}