周末工程 伊阿宋

周末工程 伊阿宋昨天晚上autro和今天上午,花了大约8小时,写了一个小程序。这个小程序的名字叫做Jason,不是英文的詹森,而是希腊神话里大名鼎鼎的伊
阿宋。叫这个名字的原因后面再说,先说说它的作用是这样的。1. 环境和需求
已知电驴支持WEB远程管理。
一台服务器工作在NAT之内,NAT的外网IP是电信链路,动态IP。
在NAT上做电驴和FTP的端口映射(虚拟服务器)。在这种情况下,如果知道NAT 的外网IP,就可以通过IP和端口访问NAT内网的电驴
WEB界面和FTP了。伊阿宋 能回答服务器的外网IP。2. 原理伊阿宋 是Emacs下的lisp程序,
调用了jabber.el。插话,jabber是用于网络聊天的协议,著名的Gtalk使用了这一协议,
另一个著名的聊天工具,MSN,也可以与jabber的服务器群(是这么叫么?)连
起来。还有一个著名的聊天工具 QQ, 也可以与它们相连,不同QQ协议是企业保
密的协议,不公开,反向工具是可能判有期徒刑的。jabber.el是工具在emacs下的jabber客户端,因此也可以视为
gtalk/msn/oicq/qq等的客户端。伊阿宋调用了jabber。当我在NAT外网――也可以是内网,举外网为例是说明它比较强大的意思――或者
任何地方用GTALK联系一下伊阿宋,它已经在NAT内网的一台计算机上运行了。伊阿宋接到GTALK聊天以后,会忽略绝大部分内容,如果没有人操作,看起来就
像一个挂在线上主人离开的GTALK。如果伊阿宋接收到的消息是"/ip",则视为指令,用curl(一个工具,不知请
GOOGLE之)访问某个可以获取外网IP(public IP)的站点,从而得到自己的外
网IP,然后这一IP用消息发送给刚刚发出"/ip"请求的GTALK用户。curl为什么能获取到请求者的外网IP呢?熟悉php/asp/jsp的同学一定知道这些
语言都支持获取浏览器客户端的IP等信息吧。curl在这里扮演了浏览器的角色。
事实上,你可以视curl为命令行的浏览器。伊阿宋把外网IP发送给我的GTALK客户端――上面提到,我在外网。然后我用外网IP加上事先就知道的端口,就可以在世界上任何有网络或有
GPRS/3G的地方,把要下载的电驴资源提交到我的电驴上――运行在NAT内网,配
置了web管理。电驴web管理界面的IP地址是,正是伊阿宋告诉我的。伊阿宋运行
在与电驴相同的NAT内网,具有相同的外网IP。最后,我还可以根据这一外网IP通过FTP下载或移除已经下完成的电驴资源,只
要设置电驴的incoming目录可以被FTP服务器访问就可以了。3. 命名这个小程序为啥叫伊阿宋呢?这个小子当年因为啥啥需要金羊毛,组织了个敢死队,历尽艰险。话说伊阿宋是个牛人,他的老师是个马人,错了,半人马。这匹半人马叫做喀戎,
是比伊阿宋还著名的――最著名的英雄赫拉克勒斯的老师,后来被赫英雄误伤死
了。而赫英雄做了N件伟业,像徒手杀狮子(载于初中语文课本来着),是后来阿喀硫
斯的偶像。阿喀硫斯,这个就牛到大部分人都知道了,就是 布拉德・比特 在特洛伊里扮演
的那个家伙。他的事迹,我就不赘述了。赫英雄的老师也教了伊阿宋。伊阿宋没啥太多的英雄事迹,不过似乎是个领导,
他带了一船人去整金羊毛,这一船人后来有N多都载入了史册。恩,载入了神话。其中有 赫拉克勒斯,刚才我们说过了;还有埃阿斯他爸,埃英雄在特洛伊中戏份
也不少,特洛伊里有两个非亲非故同名的埃阿斯,这个不知道是哪个的爸――查
到了,两位爸爸都在;还有阿喀琉斯他爸,这位兄弟娶了一位女海神,就是她整
出了阿喀硫斯的脚踵;还有忒修斯,后来是雅典的国王……这里N多都是宙斯的
儿子或者波塞东的儿子之类。总之,这么个富二代官二代,及后来的牛人的爹们组成的全明星队,居然拿不到
金羊毛。最后多亏了一位女巫 美狄亚,与我们有关的,她最大的优势就是她是内部人。她
喜欢上了英俊的伊阿宋,背叛了自己的祖国啥的,跟我们的评书里弃暗投明的肖
太后她姑娘有得一拼。伊阿宋答应并兑现诺言娶了美狄亚,但是后来他背信弃义抛弃了她。她诅咒伊阿
宋和并杀害了他们的两个儿子,跑了。后面悲惨的结局不是关键,伊阿宋是通过内部的美狄亚才取得了外网IP,从而得
到金羊毛,这是伊阿宋的故事的亮点。

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