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A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.Synchronous Event Demultiplexer: It is itself a system call that waits for one or more events to occur. The caller will be blocked when calling it until an event is generated on the synchronous event separator. For Linux, synchronous event splitter refers to common I/O multiplexing mechanisms, such as select, poll, epoll, etc. In the Java NIO domain, the corresponding component of the synchronous event separator is the Selector; The corresponding blocking method is the select method.当初在天下游荡了那么久，没有效忠于任何一个诸侯，直到最后遇到了韩信。林绍涛、周一鸣和贾宽自大学伊始，便是同窗好友，风雨十数载，如今携手一起迈入了四十岁门槛，在这个重要的人生中转站里，他们互相扶持面对来自事业、感情、友情等各方面的考验。一家惨杀事件幸存的少女藤子。不能像妈妈那样。不知不觉中，他变成了只追求幸福的杀人鬼。11岁的少女藤子作为一家惨杀事件的幸存者受到了精神创伤。但是她的人生不知什么时候开始发狂了我是能让人生重新来过的女人”，一边嘟囔着一边反复杀害。为什么她会杀人，是谁杀了她的家人，是对爱的渴望，还是对幸福的执着，当真相被揭开的时候，最高的余味和惊愕的结局，将观众推向了战栗和恸哭。本剧讲述了1949年3月 毛主席带领中共中央进驻北京香山 完成解放全中国 筹建新中国的进程 搭建起新中国的四梁八柱 于1949年10月1日 向全世界宣布中华人民共和国成立的伟大故事