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listener.go
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listener.go
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package servers
import (
"crypto/tls"
"errors"
"net/http"
"time"
"github.com/Doridian/wsvpn/server/upgraders"
"github.com/Doridian/wsvpn/shared"
)
const ReadHeaderTimeout = time.Duration(10) * time.Second
func (s *Server) listenUpgraders() {
for _, upgrader := range s.upgraders {
s.serveWaitGroup.Add(1)
upgrader.SetHeaders(s.headers)
go func(upgrader upgraders.SocketUpgrader) {
defer s.serveWaitGroup.Done()
err := upgrader.ListenAndServe()
s.setServeError(err)
}(upgrader)
}
}
func (s *Server) addUpgrader(upgrader upgraders.SocketUpgrader) {
s.upgraders = append(s.upgraders, upgrader)
s.addCloser(upgrader)
}
func (s *Server) setUpgraderHeaders() {
for _, upgrader := range s.upgraders {
upgrader.SetHeaders(s.headers)
}
}
func (s *Server) listenPlaintext(httpHandlerFunc http.HandlerFunc) {
if s.HTTP3Enabled {
s.setServeError(errors.New("HTTP/3 requires TLS"))
return
}
s.addUpgrader(upgraders.NewWebSocketUpgrader())
s.listenUpgraders()
server := &http.Server{
Addr: s.ListenAddr,
Handler: httpHandlerFunc,
ReadHeaderTimeout: ReadHeaderTimeout,
}
s.addCloser(server)
s.serveWaitGroup.Add(1)
go func() {
err := server.ListenAndServe()
s.setServeError(err)
}()
}
func (s *Server) listenEncrypted(httpHandlerFunc http.HandlerFunc) {
if s.HTTP3Enabled {
webtransportUpgrader := upgraders.NewWebTransportUpgrader(&upgraders.QuicServerConfig{
Addr: s.ListenAddr,
TLSConfig: s.TLSConfig,
Handler: httpHandlerFunc,
})
s.addUpgrader(webtransportUpgrader) // This calls addCloser for us
httpHandlerFunc = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_ = webtransportUpgrader.SetQUICHeaders(w.Header())
s.serveSocket(w, r)
})
}
server := &http.Server{
Addr: s.ListenAddr,
TLSConfig: s.TLSConfig,
Handler: httpHandlerFunc,
ReadHeaderTimeout: ReadHeaderTimeout,
}
s.addCloser(server)
s.addUpgrader(upgraders.NewWebSocketUpgrader())
s.listenUpgraders()
s.serveWaitGroup.Add(1)
go func() {
err := server.ListenAndServeTLS("", "")
s.setServeError(err)
}()
}
func (s *Server) listen() {
s.upgraders = make([]upgraders.SocketUpgrader, 0)
tlsConfigTemp := s.TLSConfig
if tlsConfigTemp != nil && tlsConfigTemp.GetConfigForClient != nil {
tlsConfigTemp, _ = tlsConfigTemp.GetConfigForClient(nil)
}
s.log.Printf("VPN server online at %s (HTTP/3 %s, TLS %s, mTLS %s), Mode %s, Subnet %s (%d max clients), MTU %d",
s.ListenAddr, shared.BoolToEnabled(s.HTTP3Enabled), shared.BoolToEnabled(tlsConfigTemp != nil),
shared.BoolToEnabled(tlsConfigTemp != nil && tlsConfigTemp.ClientAuth == tls.RequireAndVerifyClientCert), s.Mode.ToString(), s.VPNNet.GetRaw(), s.VPNNet.GetClientSlots(), s.mtu)
httpHandlerFunc := http.HandlerFunc(s.serveSocket)
if tlsConfigTemp == nil {
s.listenPlaintext(httpHandlerFunc)
} else {
s.listenEncrypted(httpHandlerFunc)
}
}