Added Read and Write timeouts.

conn.go

@@ -201,7 +201,7 @@ func (c *Conn) handleGreet(enhanced bool, arg string) {
 		}
 		if c.authAllowed() {
 			authCap := "AUTH"
-			for name, _ := range c.server.auths {
+			for name := range c.server.auths {
 				authCap += " " + name
 			}
 
@@ -471,19 +471,11 @@ func (c *Conn) greet() {
 	c.WriteResponse(220, fmt.Sprintf("%v ESMTP Service Ready", c.server.Domain))
 }
 
-// Calculate the next read or write deadline based on MaxIdleSeconds.
-func (c *Conn) nextDeadline() time.Time {
-	if c.server.MaxIdleSeconds == 0 {
-		return time.Time{} // No deadline
-	}
-
-	return time.Now().Add(time.Duration(c.server.MaxIdleSeconds) * time.Second)
-}
-
 func (c *Conn) WriteResponse(code int, text ...string) {
 	// TODO: error handling
-
-	c.conn.SetDeadline(c.nextDeadline())
+	if c.server.WriteTimeout != 0 {
+		c.conn.SetWriteDeadline(time.Now().Add(c.server.WriteTimeout))
+	}
 
 	for i := 0; i < len(text)-1; i++ {
 		c.text.PrintfLine("%v-%v", code, text[i])
@@ -493,8 +485,10 @@ func (c *Conn) WriteResponse(code int, text ...string) {
 
 // Reads a line of input
 func (c *Conn) ReadLine() (string, error) {
-	if err := c.conn.SetReadDeadline(c.nextDeadline()); err != nil {
-		return "", err
+	if c.server.ReadTimeout != 0 {
+		if err := c.conn.SetReadDeadline(time.Now().Add(c.server.ReadTimeout)); err != nil {
+			return "", err
+		}
 	}
 
 	return c.text.ReadLine()

example_test.go

@@ -139,7 +139,8 @@ func ExampleNewServer() {
 
 	s.Addr = ":1025"
 	s.Domain = "localhost"
-	s.MaxIdleSeconds = 300
+	s.WriteTimeout = 300
+	s.ReadTimeout = 300
 	s.MaxMessageBytes = 1024 * 1024
 	s.MaxRecipients = 50
 	s.AllowInsecureAuth = true

go.sum

@@ -0,0 +1,2 @@
+github.com/emersion/go-sasl v0.0.0-20161116183048-7e096a0a6197 h1:rDJPbyliyym8ZL/Wt71kdolp6yaD4fLIQz638E6JEt0=
+github.com/emersion/go-sasl v0.0.0-20161116183048-7e096a0a6197/go.mod h1:G/dpzLu16WtQpBfQ/z3LYiYJn3ZhKSGWn83fyoyQe/k=

server.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"sync"
+	"time"
 
 	"github.com/emersion/go-sasl"
 )
@@ -27,11 +28,12 @@ type Server struct {
 
 	Domain            string
 	MaxRecipients     int
-	MaxIdleSeconds    int
 	MaxMessageBytes   int
 	AllowInsecureAuth bool
 	Strict            bool
 	Debug             io.Writer
+	ReadTimeout       time.Duration
+	WriteTimeout      time.Duration
 
 	// If set, the AUTH command will not be advertised and authentication
 	// attempts will be rejected. This setting overrides AllowInsecureAuth.