优化 telnet组件可独立设置用户

extensions/telnet/telnetd.c

@@ -154,6 +154,11 @@ static void telnetdConnection(int client)
     shellCompanionAdd(telnetdShell, SHELL_COMPANION_ID_TELNETD, (void *)client);
     shellInit(telnetdShell, shellBuffer, TELNETD_SHELL_BUFFER_SIZE);
 
+    if (TELNETD_SHELL_USER)
+    {
+        shellRun(telnetdShell, TELNETD_SHELL_USER);
+    }
+
     while (1)
     {
         len = recv(client, data, 1, 0);

extensions/telnet/telnetd.h

@@ -36,6 +36,11 @@
  */
 #define TELNETD_SHELL_BUFFER_SIZE   512
 
+/**
+ * @brief telnet shell的用户名，使用默认shell用户设置为NULL即可
+ */
+#define TELNETD_SHELL_USER          NULL
+
 /**
  * @brief 新线程接口
  *