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<b>DNS</b><br />可在www.armecos.com下载完整文档。<br /><br />请问那位高手移植过动态域名解析程序到ARM上<br />lizhenarm 发表于 2006-2-22 09:22 ZLG-ARM<br /><br /><br />你看看RFC1034/1035就知道如何写DNS程序了<br />gdtyy 发表于 2006-2-22 18:07:58 ZLG-ARM<br /><br /> 你按照协议要求组成一个请求包，然后解析应答包内容就可以从域名得到IP地址。下面有一个示例，你可以参考一下。一般在单片机里实现的DNS就是指域名到IP转换，不必实现完整协议。你可以试试在ECOS或LINUX里找源码。<br /><br /> 因为对外的IP地址可能动态变化，所以最好用域名，方便用户访问。<br /> 可以使用代理网关，或者ADSL，或CDMA等连接公网，关键是得到公网IP才能被访问，否则只能发起主动连接。当得到动态公网IP时，就刷新DNS，用户用DNS就能间接访问到WEB。<br /><br />www.163.com域名解析实例(2005/03/08 12:45 test by YangYi)<br /><br />dns send 29 bytes:0,0,1,0,0,1,0,0,0,0,0,0,3,77,77,77,3,31,36,33,3,63,6f,6d,0,0,1,0,1<br /><br />dns recv 230 bytes:0,0,81,80,0,1,0,6,0,2,0,2,3,77,77,77,3,31,36,33,3,63,6f,6d,0,<br />0,1,0,1,c0,c,0,5,0,1,0,0,3a,c9,0,1d,3,77,77,77,5,63,61,63,68,65,5,73,70,6c,69,74<br />,7,6e,65,74,65,61,73,65,3,63,6f,6d,0,c0,29,0,1,0,1,0,0,8,60,0,4,ca,6a,a8,6d,c0,2<br />9,0,1,0,1,0,0,8,60,0,4,ca,6a,a8,79,c0,29,0,1,0,1,0,0,8,60,0,4,ca,6c,24,99,c0,29,<br />0,1,0,1,0,0,8,60,0,4,ca,6a,a8,67,c0,29,0,1,0,1,0,0,8,60,0,4,ca,6a,a8,68,c0,33,0,<br />2,0,1,0,0,40,a0,0,c,9,6e,73,2d,73,70,6c,69,74,32,c0,39,c0,33,0,2,0,1,0,0,40,a0,0<br />,c,9,6e,73,2d,73,70,6c,69,74,31,c0,39,c0,a2,0,1,0,1,0,0,3a,be,0,4,ca,6a,ba,7d,c0<br />,ba,0,1,0,1,0,0,3a,b0,0,4,ca,6a,a8,4f<br /><br />PASS:<www.cache.split.netease.com. is 202.106.168.109><br /><br />name = "www.163.com" <-----> IP = 202.106.168.109
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