什么是Raw Socket呢？下面是來自wikipedia的解釋： In computer networking, a raw socket is a socket that allows direct access to packet's headers. Due to the fact that raw sockets allow users to craft packets' headers, their power can be abused to perform attacks such as IP address spoofing in hand with denial-of-service. Raw Socket的最大特點就是允許用戶自己定義packet header，如果這一功能被濫用，就可以被用來實現IP地址欺騙，以及DoS***。 Raw sockets are not a programming language-level construct, they are part of the underlying operating system's networking API. Most socket interfaces, especially those based on the Berkeley sockets, support them. Raw Socket不是編程語言級別的標準構造，由OS里面的低層API支持，大多數的網絡接口都支持Raw Socket。 Usually raw sockets receive packets containing the header, as opposed to standard sockets, which receive just the payload with the headers stripped for programmer's convenience. For outgoing packets, whether or not a header is automatically prepended is usually a raw socket's configurable option. 通過Raw Socket接收到的數據包帶有包頭，通過標準Socket只能接收到凈載，通過Raw Socket發出數據時，要不要自動生成pocket header是可配置的。 Raw sockets are usually used on the network's transport layer or network layer. Raw Socket通常用在傳輸層和網絡層。

轉載于:https://blog.51cto.com/simon/76043

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