RFC1948中提出了一个较好的初始化序列号ISN随机生成算法，简单描述就是：
ISN = C +H(sourceIP, sourcePort, destIP, destPort)
H中的4个参数分别是：源IP，，源端口号，目的IP，目的端口号。
闲话少说，看代码。
#include<iostream>#include<string>#include<fstream>#include<unistd.h>//unsleep()using namespace std;unsigned int SDBMHash(char* str){unsigned int hash = 0;while(*str){hash = (*str++) + (hash << 6) + (hash << 16) – hash;}return (hash & 0x7FFFFFFF);}unsigned int JSHash(char* str){unsigned int hash = 1315423911;while(*str)hash = (hash << 5) + (*str++) + (hash >> 2);return (hash & 0x7FFFFFFF);}unsigned int ELFHash(char* str){unsigned int hash = 0;unsigned int x = 0;while(*str){hash = (hash << 4) + (*str++);if((x= (hash & 0xF0000000L)) != 0){hash = (x >> 24);hash &=~x;}}return (hash & 0x7FFFFFFF);}unsigned int DJBHash(char* str){unsigned int hash = 5381;while(*str)hash += (hash << 5) + (*str++);return (hash & 0x7FFFFFFF);}clock_t getTime(){return clock();}int main(int argc, char* argv[]){unsigned int hash;//输入5个参数,格式为:exe名 源IP地址 源端口号 目的IP地址 目的端口号hash = SDBMHash(argv[1]) + JSHash(argv[2]) + ELFHash(argv[3]) + DJBHash(argv[4]); ofstream outfile("result.txt");if(!outfile)cout << "Open result.txt error!" << endl;while(!usleep(4)){outfile << hash + getTime() << endl;}outfile.close();return 0;}
当你感到悲哀痛苦时，最好是去学些什么东西。
