2020-01-19 12:00:53 +00:00
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package ldapserver
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import (
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"bufio"
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"net"
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"sync"
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"time"
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)
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// Server is an LDAP server.
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type Server struct {
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Listener net.Listener
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ReadTimeout time.Duration // optional read timeout
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WriteTimeout time.Duration // optional write timeout
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wg sync.WaitGroup // group of goroutines (1 by client)
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chDone chan bool // Channel Done, value => shutdown
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// OnNewConnection, if non-nil, is called on new connections.
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// If it returns non-nil, the connection is closed.
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OnNewConnection func(c net.Conn) error
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// Handler handles ldap message received from client
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// it SHOULD "implement" RequestHandler interface
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Handler Handler
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NewUserState func() UserState
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}
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//NewServer return a LDAP Server
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func NewServer() *Server {
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return &Server{
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chDone: make(chan bool),
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}
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}
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// Handle registers the handler for the server.
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// If a handler already exists for pattern, Handle panics
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func (s *Server) Handle(h Handler) {
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if s.Handler != nil {
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2020-02-01 14:05:44 +00:00
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Logger.Fatal("LDAP: multiple Handler registrations")
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2020-01-19 12:00:53 +00:00
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}
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s.Handler = h
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}
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// ListenAndServe listens on the TCP network address s.Addr and then
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// calls Serve to handle requests on incoming connections. If
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// s.Addr is blank, ":389" is used.
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func (s *Server) ListenAndServe(addr string, options ...func(*Server)) error {
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if addr == "" {
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addr = ":389"
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}
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var e error
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s.Listener, e = net.Listen("tcp", addr)
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if e != nil {
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return e
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}
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Logger.Printf("Listening on %s\n", addr)
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for _, option := range options {
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option(s)
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}
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return s.serve()
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}
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// Handle requests messages on the ln listener
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func (s *Server) serve() error {
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defer s.Listener.Close()
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if s.Handler == nil {
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Logger.Panicln("No LDAP Request Handler defined")
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}
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i := 0
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for {
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select {
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case <-s.chDone:
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Logger.Print("Stopping server")
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s.Listener.Close()
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return nil
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default:
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}
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rw, err := s.Listener.Accept()
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if s.ReadTimeout != 0 {
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rw.SetReadDeadline(time.Now().Add(s.ReadTimeout))
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}
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if s.WriteTimeout != 0 {
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rw.SetWriteDeadline(time.Now().Add(s.WriteTimeout))
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}
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if nil != err {
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if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
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continue
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}
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Logger.Println(err)
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}
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cli, err := s.newClient(rw)
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if err != nil {
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continue
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}
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i = i + 1
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cli.Numero = i
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Logger.Printf("Connection client [%d] from %s accepted", cli.Numero, cli.rwc.RemoteAddr().String())
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s.wg.Add(1)
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go cli.serve()
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}
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return nil
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}
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// Return a new session with the connection
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// client has a writer and reader buffer
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func (s *Server) newClient(rwc net.Conn) (c *client, err error) {
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c = &client{
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srv: s,
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rwc: rwc,
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br: bufio.NewReader(rwc),
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bw: bufio.NewWriter(rwc),
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userState: s.NewUserState(),
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}
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return c, nil
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}
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// Termination of the LDAP session is initiated by the server sending a
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// Notice of Disconnection. In this case, each
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// protocol peer gracefully terminates the LDAP session by ceasing
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// exchanges at the LDAP message layer, tearing down any SASL layer,
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// tearing down any TLS layer, and closing the transport connection.
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// A protocol peer may determine that the continuation of any
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// communication would be pernicious, and in this case, it may abruptly
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// terminate the session by ceasing communication and closing the
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// transport connection.
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// In either case, when the LDAP session is terminated.
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func (s *Server) Stop() {
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close(s.chDone)
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Logger.Print("gracefully closing client connections...")
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s.wg.Wait()
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Logger.Print("all clients connection closed")
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}
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