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/*************************************************************
 *  smtp.cpp - Use SMTP to send an eMail with an Attachment and verify  *
 *  Copyright (C) 2001-2002 by ShadowStar.                                          *
 *  Use and modify freely.                                                                      *
 *  http://shadowstar.126.com/                                                               *
 *************************************************************
 */
//---------------------------------------------------------------------------

#include <winsock2.h>
#include <string.h>
#include <stdio.h>

const int  BASE64_MAXLINE = 76;
const char EOL[] = " ";
const char BASE64_TAB[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
      "abcdefghijklmnopqrstuvwxyz0123456789+/";
const char HEADER[] =
  "HELO support.com "
  //"AUTH LOGIN " //+ BASE64 USER + BASE64 PASS
  "MAIL FROM: chinansl@support.com "
  "RCPT TO: shadowstar@support.com "
  "DATA "
  "FROM: chinansl@support.com "
  "TO: shadowstar@support.com "
  "SUBJECT: this is a test "
  "Date: 2002-5-14 "
  "X-Mailer: shadowstar's mailer "
  "MIME-Version: 1.0 "
  "Content-type: multipart/mixed; boundary="#BOUNDARY#" "
  //"Content-Type: text/plain; charset=gb2312 "
  " ";
const char CONTENT[] =
  " --#BOUNDARY# "
  "Content-Type: text/plain; charset=gb2312 "
  "Content-Transfer-Encoding: quoted-printable "
  " "
  "/*************************************************************"
  " *  smtp.cpp - Use SMTP to send an eMail with an Attachment and verify  *"
  " *  Copyright (C) 2001-2002 by ShadowStar.                                          *"
  " *  Use and modify freely.                                                                      *"
  " *  http://shadowstar.126.com/                                                               *"
  " *************************************************************"
  " */ "
  " ";
const char ATT_HEADER[] =
  " --#BOUNDARY# "
  "Content-Type: application/octet-stream; name=smtp.exe "
  "Content-Disposition: attachment; filename=smtp.exe "
  "Content-Transfer-Encoding: base64 "
  " ";

//---------------------------------------------------------------------------
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen);

int main(int argc, char* argv[])
{
 WSADATA wsaData;
 int  SockFD;
 struct sockaddr_in ServAddr;
 char  buf[0x100];
 int     x;
 FILE    *fp;
 char    *aatt = new char[0x400000];
 char *batt = new char[0x555556];

 WSAStartup(MAKEWORD(2,2), &wsaData);

 LPHOSTENT pHost = gethostbyname("172.16.234.111");
 SockFD = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 ServAddr.sin_family = AF_INET;
 ServAddr.sin_addr.s_addr = *(ULONG *)pHost->h_addr_list[0];
 ServAddr.sin_port = htons(25);

 connect(SockFD, (struct sockaddr *)&ServAddr, sizeof(ServAddr));
 //send HEADER
 send(SockFD, HEADER, strlen(HEADER), 0);
 //send CONTENT
 send(SockFD, CONTENT, strlen(CONTENT), 0);
 //send ATT_HEADER
 send(SockFD, ATT_HEADER, strlen(ATT_HEADER), 0);
 //read attachment
 fp = fopen(argv[0], "rb");
 fseek(fp, 0, 2);
 x = ftell(fp);
 if (x > 0x400000)
  x = 0;
 rewind(fp);
 fread(aatt, x, 1, fp);
 fclose(fp);
 x = ANSIToBase64(aatt, x, batt, 0x555556);
 //send base64 attachment
 send(SockFD, batt, x, 0);

 send(SockFD, ". ", strlen(". "), 0);   //end
 send(SockFD, "QUIT ", strlen("QUIT "), 0); //quit

 closesocket(SockFD);
 WSACleanup();

 delete []aatt;
 delete []batt;
 return 0;
}
//---------------------------------------------------------------------------
int ANSIToBase64(const char *szInANSI, int nInLen, char *szOutBase64, int nOutLen)
{
 //Input Parameter validation
 if ((szInANSI == NULL) || (nInLen == 0) || (szOutBase64 == NULL) || (nOutLen == 0))
  return 0;
 if (nOutLen < (nInLen*4/3 + 1 + nInLen*4/3/BASE64_MAXLINE*2 + 1 + 4))
  return 0;

 //Set up the parameters prior to the main encoding loop
 int nInPos  = 0;
 int nOutPos = 0;
 int nLineLen = 0;
 int c1, c2, c3;
 int i;

 // Get three characters at a time from the input buffer and encode them
 for (i=0; i<nInLen/3; ++i)
 {
  //Get the next 2 characters
  c1 = szInANSI[nInPos++] & 0xFF;
  c2 = szInANSI[nInPos++] & 0xFF;
  c3 = szInANSI[nInPos++] & 0xFF;

  //Encode into the 4 6 bit characters
  szOutBase64[nOutPos++] = BASE64_TAB[c1 >> 2];
  szOutBase64[nOutPos++] = BASE64_TAB[((c1 << 4) | (c2 >> 4)) & 0x3F];
  szOutBase64[nOutPos++] = BASE64_TAB[((c2 << 2) | (c3 >> 6)) & 0x3F];
  szOutBase64[nOutPos++] = BASE64_TAB[c3 & 0x3F];
  nLineLen += 4;

  //Handle the case where we have gone over the max line boundary
  if (nLineLen > BASE64_MAXLINE - 4)
  {
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   nLineLen = 0;
  }
 }

 // Encode the remaining one or two characters in the input buffer
 switch (nInLen % 3)
 {
  case 0:
  {
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  case 1:
  {
   c1 = szInANSI[nInPos] & 0xFF;
   szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
   szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4)];
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  case 2:
  {
   c1 = szInANSI[nInPos++] & 0xFF;
   c2 = szInANSI[nInPos] & 0xFF;
   szOutBase64[nOutPos++] = BASE64_TAB[(c1 & 0xFC) >> 2];
   szOutBase64[nOutPos++] = BASE64_TAB[((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4)];
   szOutBase64[nOutPos++] = BASE64_TAB[((c2 & 0x0F) << 2)];
   szOutBase64[nOutPos++] = '=';
   szOutBase64[nOutPos++] = EOL[0];
   szOutBase64[nOutPos++] = EOL[1];
   break;
  }
  default:
  {
   return 0;
  }
 }

 szOutBase64[nOutPos] = 0;

 return nOutPos;
}