traverse_TCP_states.cpp

#include <string>
#include <vector>
#include <unordered_map>
std::unordered_map<std::string,std::vector<std::pair<std::string,std::string>>> routing = {{"CLOSED",{{"APP_PASSIVE_OPEN","LISTEN"},{"APP_ACTIVE_OPEN","SYN_SENT"}}},
                                                                                           {"LISTEN",{{"RCV_SYN","SYN_RCVD"},{"APP_SEND","SYN_SENT"},{"APP_CLOSE","CLOSED"}}},
                                                                                           {"SYN_RCVD",{{"APP_CLOSE","FIN_WAIT_1"},{"RCV_ACK","ESTABLISHED"}}},
                                                                                           {"SYN_SENT",{{"RCV_SYN","SYN_RCVD"},{"RCV_SYN_ACK","ESTABLISHED"},{"APP_CLOSE","CLOSED"}}},
                                                                                           {"ESTABLISHED",{{"APP_CLOSE","FIN_WAIT_1"},{"RCV_FIN","CLOSE_WAIT"}}},
                                                                                           {"FIN_WAIT_1",{{"RCV_FIN","CLOSING"},{"RCV_FIN_ACK","TIME_WAIT"},{"RCV_ACK","FIN_WAIT_2"}}},
                                                                                           {"CLOSING",{{"RCV_ACK","TIME_WAIT"}}},
                                                                                           {"FIN_WAIT_2",{{"RCV_FIN","TIME_WAIT"}}},
                                                                                           {"TIME_WAIT",{{"APP_TIMEOUT","CLOSED"}}},
                                                                                           {"CLOSE_WAIT",{{"APP_CLOSE","LAST_ACK"}}},
                                                                                           {"LAST_ACK",{{"RCV_ACK","CLOSED"}}}};
std::string traverse_TCP_states(const std::vector<std::string> &events){
    std::string state = "CLOSED";
    for (auto ha:events){
        std::string temp = state;
        for (auto a:routing[state]){
            if(a.first==ha)
                state=a.second;
        }
        if(state==temp){
            return "ERROR";
        }

    }
    return state;
}