計網課設c/c++ 電子郵件客戶端程式實作發送接收郵件

參照教材 6.5 節原理，設計一個電子郵件客戶端程式，
可實作發送與接受，
如果發送郵件出去接受不到請把代碼中的輸出注釋取消，運行確定錯誤地點
不懂的評論問
base64在線轉碼：
https://base64.us/

#include <iostream>
#include <string>
#include <WinSock2.h>
#include <stdio.h>
#include <unistd.h>

using namespace std;
#pragma comment(lib, "ws2_32.lib") /*鏈接ws2_32.lib元件*/

int main() {
    char buff[50000]; //收到recv函式回傳的結果
    string message;
    string info;
    string subject;
    WSADATA wsaData;
    WORD wVersionRequested = MAKEWORD(2, 1);
    //WSAStarup，即WSA(Windows SocKNDs Asynchronous，Windows套接字異步)的啟動命令
    int err = WSAStartup(wVersionRequested, &wsaData);
    SOCKADDR_IN addrServer; //服務端地址
    HOSTENT *pHostent;//hostent是host entry的縮寫，該結構記錄主機的資訊，包括主機名、別名、地址型別、地址長度和地址串列
    SOCKET sockClient; //客戶端的套接字
    /*
    使用 MAIL 命令指定發送者
    使用 RCPT 命令指定接收者，可以重復使用RCPT指定多個接收者
    */
    cout << "你想查看郵件還是發郵件？\n\t1.查看郵箱\n\t2.發送郵件\n";
    int call;
    cin >> call;
    if (call == 2) {
        sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket物件
        pHostent = gethostbyname("smtp.qq.com"); //得到有關于域名的資訊,鏈接到qq郵箱服務器
        addrServer.sin_addr.S_un.S_addr = *((DWORD *) pHostent->h_addr_list[0]); //得到smtp服務器的網路位元組序的ip地址
        addrServer.sin_family = AF_INET;
        addrServer.sin_port = htons(25); //連接埠25
        //int connect (SOCKET s , const struct sockaddr FAR *name , int namelen ); //函式原型
        err = connect(sockClient, (SOCKADDR *) &addrServer, sizeof(SOCKADDR)); //向服務器發送請求
        buff[recv(sockClient, buff, 500, 0)] = '\0';
        /*
        登錄郵件服務器
        */
        message = "ehlo qq.com\r\n";
        send(sockClient, message.c_str(), message.length(), 0); //發送ehlo命令
        buff[recv(sockClient, buff, 500, 0)] = '\0';   //接識訓傳值
       // cout <<"1" <<  buff << endl;

        message = "auth login\r\n";
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"2" <<  buff << endl;
        /*
        發送base64加密的用戶名、密碼
        */
        message = "MTc2NjQ2ODQzNA==\r\n";
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"3" <<  buff << endl;

        message = "bmVmdHltemNpd2lxY2ZmaQ==\r\n";/**/
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"4" <<  buff << endl;
        string mail;
        cout << "請輸入收件人郵箱：";
        cin >> mail;

        message = "MAIL FROM:<1766468434@qq.com> \r\nRCPT TO:<";
        message.append(mail);
        message.append("> \r\n");
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"5" <<  buff << endl;
        // buff[recv(sockClient, buff, 500, 0)] = '\0';
        /*
        使用 DATA 命令告訴服務器要發送郵件內容
        */
        message = "DATA\r\n";
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"6" <<  buff << endl;
        message = "From: 1766468434@qq.com\r\nTo: " + mail + "\r\nsubject:";
        cout << "主題：";
        cin >> subject;
        message.append(subject);
        message.append("\r\n\r\n");
        cout << "內容：";
        cin >> info;
        message.append(info);
        message.append("\r\n.\r\n");

        send(sockClient, message.c_str(), message.length(), 0);
       // cout <<"7" <<  buff << endl;
        message = "QUIT\r\n";
        send(sockClient, message.c_str(), message.length(), 0);
        buff[recv(sockClient, buff, 500, 0)] = '\0';
       // cout <<"8" <<  buff << endl;

        cout << "發送成功！" << endl;
        //system("pause");
    }
    if (call == 1) {
        sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket物件
        const char *host_id = "pop3.126.com";
        pHostent = gethostbyname("pop.qq.com");
        int port = 110;
        addrServer.sin_addr.S_un.S_addr = *((DWORD *) pHostent->h_addr_list[0]); //得到smtp服務器的網路位元組序的ip地址
        addrServer.sin_family = AF_INET;
        addrServer.sin_port = htons(port); //連接埠110
        err = connect(sockClient, (SOCKADDR *) &addrServer, sizeof(SOCKADDR)); //向服務器發送請求
        buff[recv(sockClient, buff, 500, 0)] = '\0';

        message = "user 1766468434@qq.com\r\n";
        send(sockClient, message.c_str(), message.length(), 0); //發送賬號
        buff[recv(sockClient, buff, 500, 0)] = '\0';   //接識訓傳值
        std::cout << "Client : send name \nServer:"
                  << buff << std::endl;

        message = "pass neftymzciwiqcffi\r\n";
        send(sockClient, message.c_str(), message.length(), 0); //發送Mima
        buff[recv(sockClient, buff, 500, 0)] = '\0';   //接識訓傳值
        std::cout << "Client : send pass \nServer:"
                  << buff << std::endl;

        message = "stat\r\n";
        send(sockClient, message.c_str(), message.length(), 0); //發送狀態
        buff[recv(sockClient, buff, 500, 0)] = '\0';   //接識訓傳值
        sleep(1);
        std::cout << "Client : send stat \nServer : "
                  << buff << std::endl;

        message = "list\r\n";
        send(sockClient, message.c_str(), message.length(), 0); //發送狀態
        buff[recv(sockClient, buff, 50000, 0)] = '\0';   //接識訓傳值
        sleep(1);
        std::cout << "Client : send list \nServer :"
                  << buff << std::endl;
        int n;
        std::cout << "你先想查看那一封郵件？輸入序號"
                  << std::endl;
        cin >> n;
        message = "retr " + to_string(n) + "\r\n";

        send(sockClient, message.c_str(), message.length(), 0); //發送狀態
        sleep(1);
        std::cout << "Client : send retr (...) \n";
        //下面的while回圈有些問題，目前還沒有想到解決方法，以后改正！
        //  while(1)
        // {
        buff[recv(sockClient, buff, 50000, 0)] = '\0';   //接識訓傳值
        std::cout << "Server ：" << buff << std::endl;

        /*int num = sock.recv_socket();
        std::cout << "Server ：" << sock.get_recvbuf() << std::endl;*/
        /* if(num <= 0)
         {
             break;
         }*/
        //  }

        /*  sock.send_socket("quit\r\n");
          std::cout << "Client : send quit \nServer :"
                    << sock.get_recvbuf() << std::endl;}*/
    }
}