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The sockstreet attack first completes the tcp three-way handshake the tcp connection is established, but in the last ack reply of the three-way handshake, the attacker sets its tcp window to 0 and then makes a data request. When the target discovers that the TCP window size at the receiving end is 0 when transmitting data, it will stop transmitting data and issue a TCP window probe packet to ask the attacker if its TCP window has been updated. Since the attacker does not change the size of the tcp window, the target will always maintain the tcp connection waiting for data to be sent and continuously carry out window update detection. If the attacker uses a large number of controlled hosts to carry out sockstreet attacks, the target will always maintain a large number of tcp connections and carry out a large number of window update detection, and its tcp connection table will gradually run out.Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:打工仔与设计师的时尚恋爱。胸无大志的严英宇每天就以外卖、快递等跑腿的活为生。一天给时尚公司送快递时，意外弄坏了设计师金基镇的衣服，过了几天送外卖时，竟又遇见了他。不打不相识的两人相约喝酒，次日在房间里醒来，基镇发现英宇竟拥有自己梦寐以求的模特理想身材……学校里新来的女孩爱上了她最好的朋友，并且确信他们是命中注定，即使她似乎永远都走不出"朋友区"。　　(*^◎^*)胡宗宪露出了与俞大猷听闻杭州陷落时相同的表情，但与俞大猷的处境不同，他能切实地感受到脚下地面的颤抖。当然，作为选秀的结果，本剧中理所应当的出现了新角色。Olivia Wilde (出演过The Black Donnellys)，在本剧中出演一个让House搞不定的家伙。他说“每周都会有新人被淘汰出局，大家都希望看到Ryan Seacrest在那煽情的喊\' 如果您支持13号选手，请编辑短信13，移动用户发送倒～～联通～～小灵通～～\'（也不知道米国是什么号码啦！）\"