关于Windows XP上telnet服务器的返回值 [英] About the return values of the telnet server on windows xp

问题描述

我正在xp上写一个telnet代理.现在，我可以telnet到系统的telnet服务器，并打印其返回值发送回我的程序.

I am writing a telnet proxy on xp. Now I can telnet to system's telnet server and print its return values sending back to my procedure.

我发现一个非常令人困惑的现象.当我第一次远程登录服务器时，它将要求我登录.我键入"tamlok"，我可以看到它发回给我的"116,97,109,108,111,107,10,13"是"tamlok"(10 and 13 means '\n' and '\r')的ascii值.

I find a very puzzling phenomenon. When I first telnet to the server,it will ask me to log in. I type in "tamlok", and I can see that it sending back to me that "116,97,109,108,111,107,10,13" which is the ascii value of "tamlok"(10 and 13 means '\n' and '\r').

但是，登录后，我再次输入"tamlok".它发回给我"27,91,56,59,51,52,72,116,0,97,0,108,0,111,0,107,0,27,91,57,59,49,72".

However after I log in,I type in "tamlok" again. It sends back to me that "27,91,56,59,51,52,72,116,0,97,0,108,0,111,0,107,0,27,91,57,59,49,72".

我建议它返回unicode，以便"116"变成"116,0"，依此类推.但是我无法理解序列"27,91,56,59,51,52,72"和"27,91,57,59,49,72".我认为这可能是特殊功能的序列，就像{0x1B, 0x5B, 0x48, 0x1B, 0x5B, 0x4A}会清除控制台一样.

I suggest that it returns the unicode so that "116" turns into "116,0" and so on. But I can't understand the sequence "27,91,56,59,51,52,72" and "27,91,57,59,49,72". I think it maybe a sequence for a special function, just like {0x1B, 0x5B, 0x48, 0x1B, 0x5B, 0x4A} will clear the console.

那么，如何解释呢? 欢迎任何帮助！

So,how to interpret this? Any help is welcome!

推荐答案

感谢Joachim Pileborg.现在很明显，它是终端控制代码. 示例. 因此，"27,91,56,59,51,52,72"为"[Esc] [8; 34H""，适合以下格式: 光标首页[{ROW}; {COLUMN} H 设置光标位置，随后的文本将在该位置开始.如果未提供行/列参数(即[H])，则光标将移至屏幕左上方的原始位置. 27,91,57,59,49,72也是如此.

Thanks to Joachim Pileborg.Now it is clear that it is terminal control codes. An example. So "27,91,56,59,51,52,72" is "[Esc][8;34H" which suits the pattern: Cursor Home [{ROW};{COLUMN}H Sets the cursor position where subsequent text will begin. If no row/column parameters are provided (ie. [H), the cursor will move to the home position, at the upper left of the screen. So does 27,91,57,59,49,72".

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