support expect pass sleep

README.cn.md

@@ -428,6 +428,11 @@ trzsz-ssh ( tssh ) 设计为 ssh 客户端的直接替代品，提供与 openssh
       #!! ExpectSendText2 \|1\|\|\r  # 先 sleep 100ms，然后发送 1，再 sleep 200ms，最后发送 \r 回车
   ```
 
+- 有些服务器连密码也不支持连着发送，则需要配置 `ExpectPassSleep`，默认为 `no`，可配置为 `each` 或 `enter`：
+
+  - 配置 `ExpectPassSleep each` 则每输入一个字符就 sleep 一小段时间，默认 100 毫秒，可配置 `ExpectSleepMS` 进行调整。
+  - 配置 `ExpectPassSleep enter` 则只是在发送 `\r` 回车之前 sleep 一小段时间，默认 100 毫秒，可配置 `ExpectSleepMS` 进行调整。
+
 - 如果不知道 `ExpectPattern2` 如何配置，可以先将 `ExpectCount` 配置为 `2`，然后使用 `tssh --debug` 登录，就会看到 `expect` 捕获到的输出，可以直接复制输出的最后部分来配置 `ExpectPattern2`。把 `2` 换成其他任意的数字也适用。
 
 ## 记住密码

README.en.md

@@ -428,6 +428,11 @@ trzsz-ssh ( tssh ) is an ssh client designed as a drop-in replacement for the op
       #!! ExpectSendText2 \|1\|\|\r  # Configures the second automated input, sleep 100ms, send 1, sleep 200ms, send \r.
   ```
 
+- Some servers may not support sending password continuously. Then you need to configure `ExpectPassSleep`, which is `no` by default, and can be configured as `each` or `enter`:
+
+  - Configuring `ExpectPassSleep each` will sleep for a short period of time for each character send, the default is 100 milliseconds, and you can configure `ExpectSleepMS` to adjust it.
+  - Configuring `ExpectPassSleep enter` will only sleep for a short period of time before `\r` send, the default is 100 milliseconds, and you can configure `ExpectSleepMS` to adjust it.
+
 - If you don’t know how to configure `ExpectPattern2`, you can first configure `ExpectCount` to `2`, then use `tssh --debug` to log in, you will see the output captured by `expect`, and you can directly copy the last part of the output to configure `ExpectPattern2`. Replacing `2` with any other number will also work.
 
 ## Remember Password

tssh/expect.go

@@ -122,6 +122,18 @@ func (s *expectSender) decodeText(text string) [][]string {
 	return texts
 }
 
+func (s *expectSender) getExpectPsssSleep() (bool, bool) {
+	passSleep := getExConfig(s.expect.alias, fmt.Sprintf("%sExpectPassSleep", s.expect.pre))
+	switch strings.ToLower(passSleep) {
+	case "each":
+		return true, false
+	case "enter":
+		return false, true
+	default:
+		return false, false
+	}
+}
+
 func (s *expectSender) getExpectSleepTime() time.Duration {
 	expectSleepMS := getExConfig(s.expect.alias, fmt.Sprintf("%sExpectSleepMS", s.expect.pre))
 	if expectSleepMS == "" {
@@ -140,15 +152,34 @@ func (s *expectSender) sendInput(writer io.Writer, id string) bool {
 		warning("expect %s send nothing", id)
 		return true
 	}
+	var sleepTime time.Duration
 	if s.passwd {
-		debug("expect %s send: %s\\r", id, strings.Repeat("*", len(s.input)))
-		if err := writeAll(writer, []byte(s.input+"\r")); err != nil {
+		eachSleep, enterSleep := s.getExpectPsssSleep()
+		if eachSleep || enterSleep {
+			sleepTime = s.getExpectSleepTime()
+		}
+		for _, input := range []byte(s.input) {
+			debug("expect %s send: %s", id, "*")
+			if err := writeAll(writer, []byte{input}); err != nil {
+				warning("expect %s send input failed: %v", id, err)
+				return false
+			}
+			if eachSleep {
+				debug("expect %s sleep: %v", id, sleepTime)
+				time.Sleep(sleepTime)
+			}
+		}
+		if enterSleep {
+			debug("expect %s sleep: %v", id, sleepTime)
+			time.Sleep(sleepTime)
+		}
+		debug("expect %s send: \\r", id)
+		if err := writeAll(writer, []byte("\r")); err != nil {
 			warning("expect %s send input failed: %v", id, err)
 			return false
 		}
 		return true
 	}
-	var sleepTime time.Duration
 	for i, text := range s.decodeText(s.input) {
 		if i > 0 {
 			if i == 1 {