Bind identd to config address, set read/write deadlines in ident.Server, only reply to ident queries where the remote hosts match

pkg/ident/server.go

@@ -6,23 +6,37 @@ import (
 	"net"
 	"strings"
 	"sync"
+	"time"
 )
 
 var (
+	// DefaultAddr is the address a Server listens on when no Addr is specified
 	DefaultAddr = ":113"
+	// DefaultTimeout is the the time a Server will wait before failing
+	// reads and writes if no Timeout is specified
+	DefaultTimeout = 5 * time.Second
 )
 
+// Server implements the server-side of the Ident protocol
 type Server struct {
+	// Addr is the host:port address to listen on
 	Addr string
+	// Timeout is the time to wait before failing reads and writes
+	Timeout time.Duration
 
-	idents   map[string]string
+	entries  map[string]entry
 	listener net.Listener
 	lock     sync.Mutex
 }
 
+type entry struct {
+	remoteHost string
+	ident      string
+}
+
 func NewServer() *Server {
 	return &Server{
-		idents: map[string]string{},
+		entries: map[string]entry{},
 	}
 }
 
@@ -54,35 +68,77 @@ func (s *Server) Stop() error {
 	return s.listener.Close()
 }
 
-func (s *Server) Add(local, remote, ident string) {
+func (s *Server) Add(local, remote net.Addr, ident string) {
+	if local == nil || remote == nil {
+		return
+	}
+
+	_, localPort, err := net.SplitHostPort(local.String())
+	if err != nil {
+		return
+	}
+
+	remoteHost, remotePort, err := net.SplitHostPort(remote.String())
+	if err != nil {
+		return
+	}
+
 	s.lock.Lock()
-	s.idents[local+","+remote] = ident
+	s.entries[localPort+","+remotePort] = entry{
+		remoteHost: remoteHost,
+		ident:      ident,
+	}
 	s.lock.Unlock()
 }
 
-func (s *Server) Remove(local, remote string) {
+func (s *Server) Remove(local, remote net.Addr) {
+	if local == nil || remote == nil {
+		return
+	}
+
+	_, localPort, err := net.SplitHostPort(local.String())
+	if err != nil {
+		return
+	}
+
+	_, remotePort, err := net.SplitHostPort(remote.String())
+	if err != nil {
+		return
+	}
+
 	s.lock.Lock()
-	delete(s.idents, local+","+remote)
+	delete(s.entries, localPort+","+remotePort)
 	s.lock.Unlock()
 }
 
 func (s *Server) handle(conn net.Conn) {
 	defer conn.Close()
 
+	timeout := s.Timeout
+	if timeout == 0 {
+		timeout = DefaultTimeout
+	}
+
 	scan := bufio.NewScanner(conn)
 	scan.Buffer(make([]byte, 32), 32)
+
+	conn.SetReadDeadline(time.Now().Add(timeout))
 	if !scan.Scan() {
 		return
 	}
-
-	line := scan.Text()
-	ports := strings.ReplaceAll(line, " ", "")
+	query := scan.Text()
 
 	s.lock.Lock()
-	ident, ok := s.idents[ports]
+	entry, ok := s.entries[strings.ReplaceAll(query, " ", "")]
 	s.lock.Unlock()
 
 	if ok {
-		conn.Write([]byte(fmt.Sprintf("%s : USERID : Dispatch : %s\r\n", line, ident)))
+		remoteHost, _, err := net.SplitHostPort(conn.RemoteAddr().String())
+		if err != nil || remoteHost != entry.remoteHost {
+			return
+		}
+
+		conn.SetWriteDeadline(time.Now().Add(timeout))
+		conn.Write([]byte(fmt.Sprintf("%s : USERID : Dispatch : %s\r\n", query, entry.ident)))
 	}
 }

pkg/irc/client.go

@@ -195,17 +195,24 @@ func (c *Client) Host() string {
 	return c.Config.Host
 }
 
-func (c *Client) LocalPort() string {
+func (c *Client) LocalAddr() net.Addr {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	if c.conn != nil {
-		_, local, err := net.SplitHostPort(c.conn.LocalAddr().String())
-		if err == nil {
-			return local
+		return c.conn.LocalAddr()
 	}
+	return nil
 }
-	return ""
+
+func (c *Client) RemoteAddr() net.Addr {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	if c.conn != nil {
+		return c.conn.RemoteAddr()
+	}
+	return nil
 }
 
 func (c *Client) MOTD() []string {

server/irc_handler.go

@@ -3,6 +3,7 @@ package server
 import (
 	"fmt"
 	"log"
+	"net"
 	"os"
 	"strconv"
 	"strings"
@@ -46,7 +47,8 @@ func newIRCHandler(client *irc.Client, state *State) *ircHandler {
 
 func (i *ircHandler) run() {
 	var lastConnErr error
-	var localPort string
+	var localAddr net.Addr
+	var remoteAddr net.Addr
 
 	for {
 		select {
@@ -61,11 +63,10 @@ func (i *ircHandler) run() {
 		case state := <-i.client.ConnectionChanged:
 			if identd := i.state.srv.identd; identd != nil {
 				if state.Connected {
-					if localPort = i.client.LocalPort(); localPort != "" {
-						identd.Add(localPort, i.client.Config.Port, i.client.Config.Username)
-					}
+					localAddr, remoteAddr = i.client.LocalAddr(), i.client.RemoteAddr()
+					identd.Add(localAddr, remoteAddr, i.client.Config.Username)
 				} else {
-					identd.Remove(localPort, i.client.Config.Port)
+					identd.Remove(localAddr, remoteAddr)
 				}
 			}
 
@@ -310,9 +311,7 @@ func (i *ircHandler) info(msg *irc.Message) {
 		}
 
 		if identd := i.state.srv.identd; identd != nil {
-			if localPort := i.client.LocalPort(); localPort != "" {
-				identd.Remove(localPort, i.client.Config.Port)
-			}
+			identd.Remove(i.client.LocalAddr(), i.client.RemoteAddr())
 		}
 
 		if network, ok := i.state.network(i.client.Host()); ok {

server/server.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"log"
+	"net"
 	"net/http"
 	"os"
 	"strconv"
@@ -64,6 +65,7 @@ func (d *Dispatch) Run() {
 
 	if cfg.Identd {
 		d.identd = ident.NewServer()
+		d.identd.Addr = net.JoinHostPort(cfg.Address, "113")
 		go d.identd.Listen()
 	}
 
@@ -74,7 +76,7 @@ func (d *Dispatch) Run() {
 
 	d.loadUsers()
 	d.initFileServer()
-	d.startHTTP()
+	d.serveHTTP()
 }
 
 func (d *Dispatch) loadUsers() {
@@ -119,12 +121,12 @@ func (d *Dispatch) loadUser(user *storage.User) {
 	}
 }
 
-func (d *Dispatch) startHTTP() {
+func (d *Dispatch) serveHTTP() {
 	cfg := d.Config()
 
 	port := cfg.Port
 	if cfg.Dev {
-		// The node dev network will proxy index page requests and
+		// The node dev server will proxy index page requests and
 		// websocket connections to this port
 		port = "1337"
 	}