fix: snmpv3 in ipv6

sshsvc/sshsvc.go

@@ -379,7 +379,7 @@ func handleSSHConnection(conn net.Conn, serverConfig *ssh.ServerConfig) {
 		if sshCC > int(conf.Sshd.MaxConnNum) {
 			sshMu.Unlock()
 			log.Error("Maximum number of connections exceeded")
-			//conn.Write([]byte("Reach max connections"))
+			channel.Write([]byte(fmt.Sprintf("Connection limit reached (limit=%d). Try again later.\r\n", conf.Sshd.MaxConnNum)))
 			conn.Close()
 			continue
 		}
@@ -446,15 +446,19 @@ func handleSSHShell(sshConn *ssh.ServerConn, channel ssh.Channel) {
 		Version:      global.Version,
 		Output:       mmlp.DefaultFormatType,
 		MmlHome:      conf.Sshd.MmlHome,
-		Limit:        50,
+		Limit:        conf.Sshd.MaxConnNum,
 		User:         sshConn.User(),
 		SessionToken: fmt.Sprintf("%x", sshConn.SessionID()),
 		HttpUri:      conf.OMC.HttpUri,
 		UserAgent:    config.GetDefaultUserAgent(),
 		TagNE:        conf.Sshd.TagNE,
 	}
-
 	term := term.NewTerminal(channel, fmt.Sprintf("[%s@%s]> ", omcMmlVar.User, omcMmlVar.TagNE))
+	msg := fmt.Sprintf("\r\nWelcome to the %s server!\r\n", strings.ToUpper(omcMmlVar.TagNE))
+	term.Write([]byte(msg))
+	msg = fmt.Sprintf("Last login: %s from %s \r\n\r\n", time.Now().Format(time.RFC1123), sshConn.RemoteAddr())
+	term.Write([]byte(msg))
+
 	// 启动交互式shell会话
 	for {
 		line, err := term.ReadLine()
@@ -472,6 +476,13 @@ func handleSSHShell(sshConn *ssh.ServerConn, channel ssh.Channel) {
 		}
 		var response string
 		switch cmdline {
+		case "hello":
+			term.Write([]byte("Hello, world!\r\n"))
+			goto continueLoop
+		case "time":
+			response = fmt.Sprintf("Current time: %s\r\n", time.Now().Format(time.RFC1123))
+			term.Write([]byte(response))
+			goto continueLoop
 		case "exit", "quit":
 			goto exitLoop
 		case "":