[计算机网络] C++模拟telnet登陆SMTP服务发送邮件过程

  1 #include <winsock.h>
  2 #include <stdio.h>
  3 #include <string>
  4 #include <iostream>
  5 using namespace std;
  6 #define WSWENS MAKEWORD(2,0)
  7 #define MAXLINE 10240
  8 
  9 //将服务器回应的信息打印
 10 void response(SOCKET sock,char buff[])
 11 {
 12     int len = recv(sock, buff, MAXLINE, 0);
 13     buff[len]=0;
 14     cout<<buff<<endl;
 15 }
 16 
 17 int main()
 18 {
 19     sockaddr_in sin;
 20     WSADATA wsadata;
 21 
 22     //对Winsock服务初始化
 23     if(WSAStartup(WSWENS, &wsadata) !=0)
 24         cout<<"startup failed"<<endl;
 25 
 26     //创建套接字，指定端口号
 27     SOCKET s = socket(PF_INET,SOCK_STREAM,0);
 28     memset(&sin, 0, sizeof(sin));
 29     sin.sin_family = AF_INET;
 30     sin.sin_port = htons(25);
 31 
 32     //获取服务器IP地址
 33     hostent* hptr = gethostbyname("smtp.163.com");
 34     memcpy(&sin.sin_addr.S_un.S_addr, hptr->h_addr_list[0], hptr->h_length);
 35     printf("IP of smpt.163.com is : %d:%d:%d:%d",
 36            sin.sin_addr.S_un.S_un_b.s_b1,
 37            sin.sin_addr.S_un.S_un_b.s_b2,
 38            sin.sin_addr.S_un.S_un_b.s_b3,
 39            sin.sin_addr.S_un.S_un_b.s_b4);
 40     cout << endl;
 41 
 42     //建立与服务器的连接
 43     if(connect(s, (sockaddr*)&sin, sizeof(sin)))
 44     {
 45         cout << "connect failed!" << endl;
 46         exit(0);
 47     }
 48     else
 49     {
 50         cout << "connect success!" << endl;
 51     }
 52 
 53     char bufferresv[10240];
 54     response(s, bufferresv);
 55 
 56     // send "ehlo"
 57     char bufferHello[] = "ehlo lca\r\n";
 58     cout << "ehlo..." << endl;
 59     send(s, bufferHello, strlen(bufferHello), 0);
 60     response(s,bufferresv);
 61 
 62     // send "auth login"
 63     char bufferLogin[] = "auth login\r\n";
 64     cout << "auth login..." << endl;
 65     send(s, bufferLogin, strlen(bufferLogin),0);
 66     response(s,bufferresv);
 67 
 68     // send "username", "psw"
 69     char bufferUserName[] = "bGNhMTgyNkAxNjMuY29t\r\n";
 70     //发送邮箱名lca1826@163.com的BASE64编码
 71     char bufferpsw[] = "bGNhMTgyNg==\r\n";
 72     //发送邮箱密码lca182600的BASE64编码
 73 
 74     cout << "input username...." << endl;
 75     send(s,bufferUserName,strlen(bufferUserName),0);
 76     response(s,bufferresv);
 77 
 78     cout << "input password..." << endl;
 79     send(s,bufferpsw,strlen(bufferpsw),0);
 80     response(s,bufferresv);
 81 
 82     // mail from:<lca1826@163.com>
 83     char bufferMailFrom[] = "mail from:<lca1826@163.com>\r\n";
 84     cout << "mail from:<lca1826@163.com>..." << endl;
 85     send(s, bufferMailFrom, strlen(bufferMailFrom), 0);
 86     response(s,bufferresv);
 87 
 88     // rcpt to:<lca1826@sina.com>
 89     char bufferRcptTo[] = "rcpt to:<lca1826@sina.com>\r\n";
 90     cout << "rcpt to:<lca1826@sina.com>..." << endl;
 91     send(s, bufferRcptTo, strlen(bufferRcptTo), 0);
 92     response(s,bufferresv);
 93 
 94     // data
 95     char bufferData[] = "data\r\n";
 96     cout << "data..." << endl;
 97     send(s, bufferData,strlen(bufferData), 0);
 98     response(s,bufferresv);
 99 
100     // from.. to.. subject..
101     char bufferFrom[] = "from:lca1826@163.com\r\n";
102     char bufferTo[] = "to:lca1826@sina.com\r\n";
103     char bufferSubject[] = "subject:hello from test\r\n";
104 
105     cout << "from:lca1826@163.com..." << endl;
106     send(s, bufferFrom, strlen(bufferFrom), 0);
107     cout << "to:lca1826@sina.com... " << endl;
108     send(s, bufferTo, strlen(bufferTo), 0);
109     cout << "subject:hello from test..." << endl;
110     send(s, bufferSubject, strlen(bufferSubject), 0);
111 
112     //content
113     char buffersend[] = "virus!!!\r\n";
114     cout<<"virus!!!"<<endl;
115     send(s, buffersend, strlen(buffersend), 0);
116 
117     //end
118     char bufferPoint[] = ".\r\n";
119     send(s, bufferPoint, strlen(bufferPoint), 0);
120     response(s,bufferresv);
121 
122     //quit
123     char bufferend[] = "quit\r\n";
124     send(s, bufferend, strlen(bufferend), 0);
125     response(s,bufferresv);
126     return 0;
127 }