smtp_socket_email.cpp

#include <winsock2.h>

#pragma comment(lib,"ws2_32.lib")

int Base64Enc(char *buf, char*text,int size) 

{ //摘抄自网络。

  static char *base64_encoding = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  int buflen = 0; 

  while(size>0)

  {

    *buf++ = base64_encoding[ (text[0] >> 2 ) & 0x3f];

    if(size>2)

    {

      *buf++ = base64_encoding[((text[0] & 3) << 4) | (text[1] >> 4)];

      *buf++ = base64_encoding[((text[1] & 0xF) << 2) | (text[2] >> 6)];

      *buf++ = base64_encoding[text[2] & 0x3F];

    }

    else

    {

      switch(size)

      {

      case 1:

        *buf++ = base64_encoding[(text[0] & 3) << 4 ];

        *buf++ = '=';

        *buf++ = '=';

        break;

      case 2: 

        *buf++ = base64_encoding[((text[0] & 3) << 4) | (text[1] >> 4)]; 

        *buf++ = base64_encoding[((text[1] & 0x0F) << 2) | (text[2] >> 6)]; 

        *buf++ = '='; 

        break; 

      } 

    } 

    text +=3; 

    size -=3; 

    buflen +=4; 

  } 

  *buf = 0; 

  return buflen; 

}

int main()

{

  //以下代码改编自网上的汇编代码，注意暂时没有添加附件的功能。

  //听说telnet也可以实现，但没有试验过，或则没有实验成功。

  //原理搞懂，改写成类，那太容易了。

  WSADATA wsa;

  WSAStartup(MAKEWORD(2,2),&wsa);

  SOCKET hSocket = socket( AF_INET, SOCK_STREAM, 0);

  hostent * localHost = gethostbyname("smtp.126.com");

  char * localIP = inet_ntoa (*(struct in_addr *)*localHost->h_addr_list);

  SOCKADDR_IN stSin;

  stSin.sin_family = AF_INET;

  stSin.sin_port = htons(25);

  stSin.sin_addr.s_addr = inet_addr(localIP);//这里可以直接填写ip地址，省去了上面的两行。

  connect(hSocket, (const sockaddr *)&stSin, sizeof (stSin));

  char szRcvBuffer[1024] = {0};

  recv(hSocket, szRcvBuffer,sizeof (szRcvBuffer),0);

  int x = send( hSocket,"EHLO Local\r\n", lstrlenA ("EHLO Local\r\n"), 0);//\r\n也可以。\n也可以.

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  x = send(hSocket,"AUTH LOGIN\r\n",lstrlenA ("AUTH LOGIN\r\n"), 0);//千万不要用sizeof.

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  char en_name[260] = {0};

  Base64Enc(en_name,"leguanyuan",lstrlenA("leguanyuan"));

  x = lstrlenA(en_name);

  en_name[x] = 13;

  en_name[x + 1] = 10;

  send(hSocket, en_name, lstrlenA(en_name), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  char en_psd[260] = {0};

  Base64Enc(en_psd,"**********",lstrlenA("*********"));//注释，密码暂时隐藏。

  x = lstrlenA(en_psd);

  en_psd[x] = 13;

  en_psd[x + 1] = 10;

  send(hSocket, en_psd, lstrlenA(en_psd), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  send(hSocket, "MAIL FROM:<leguanyuan@126.com>\r\n", lstrlenA("MAIL FROM:<leguanyuan@126.com>\r\n"), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  send(hSocket, "RCPT TO:<112426112@qq.com>\r\n", lstrlenA("RCPT TO:<112426112@qq.com>\r\n"), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  send(hSocket, "DATA\r\n", lstrlenA("DATA\r\n"), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  send(hSocket, "From:leguanyuan@126.com\r\n", lstrlenA("From:leguanyuan@126.com\r\n"), 0);

  send(hSocket, "TO:112426112@qq.com\r\n", lstrlenA("TO:112426112@qq.com\r\n"), 0);

  send(hSocket, "SUBJECT:hello\r\n", lstrlenA("SUBJECT:hello\r\n"), 0);

  send(hSocket, "Reply-TO:leguanyuan@126.com\r\n", lstrlenA("Reply-TO:leguanyuan@126.com\r\n"), 0);

  send(hSocket, "\r\n", lstrlenA("\r\n"), 0);

  send(hSocket, "hello\r\n", lstrlenA("hello\r\n"), 0);

  send(hSocket, ".\r\n", lstrlenA(".\r\n"), 0);

  RtlZeroMemory(szRcvBuffer,sizeof (szRcvBuffer));

  recv(hSocket,szRcvBuffer,sizeof (szRcvBuffer),0);

  send(hSocket, "QUIT\r\n", lstrlenA("QUIT\r\n"), 0);

  closesocket(hSocket);

  WSACleanup();

  return 0;

}

//made at 2011.12.06