email 邮件发送源代码（c++实现）

//ZBase64为base64编码的实现类，参考我前面的文章

bool CreateSocket() {
if(WSAStartup(MAKEWORD(2,2),&wsadata_) == SOCKET_ERROR)
{
        errornum_=WSA_STARTUP_ERROR;
  ReleaseSocket();
  return false;
}

if((socket_ = socket(AF_INET,SOCK_STREAM,0)) == SOCKET_ERROR)
{
        errornum_=WSA_SOCKET_ERROR;
        ReleaseSocket();
        return false;
    }

int time = 5000;
    if(setsockopt(socket_,SOL_SOCKET,SO_RCVTIMEO,(char *)&time,sizeof(time)) == SOCKET_ERROR)
    {
        errornum_=WSA_SETSOCKAPT_ERROR;
        ReleaseSocket();
        return false;
    }
    if(setsockopt(socket_,SOL_SOCKET,SO_SNDTIMEO,(char *)&time,sizeof(time)) == SOCKET_ERROR)
    {
        errornum_=WSA_SETSOCKAPT_ERROR;
        ReleaseSocket();
        return false;
    }

errornum_=ZSMTP_NO_ERROR;
return true;
}

bool CheckResponse(const char* RecvCode) {
  char Buf[1024]={0};
  if(recv(socket_,Buf,1024,0) == SOCKET_ERROR)
        {
            errornum_=WSA_RECV_ERROR;
            return false;
        }
  return RecvCode[0] == Buf[0] && \
      RecvCode[1] == Buf[1] && \
      RecvCode[2] == Buf[2] ? true : false;

}

/**    @fn Connect
*    @brief connect to smtp server
*    @param
*    @return true if success
*/
bool Connect() {
    if (smtpaddr_.empty())
    {
        errornum_=UNDEF_SERVERADDR;
        return false;
    }
    if (port_==0)
    {
        errornum_=UNDEF_SERVERPORT;
        return false;
    }
if(!CreateSocket())
  return false;

if((hostent_=gethostbyname(smtpaddr_.c_str()))==NULL)
{
        errornum_=WSA_GETHOSTBYNAME_ERROR;
  ReleaseSocket();
  return false;
}

if(hostent_->h_addr_list[0] == NULL)
{
        errornum_=WSA_GETHOSTBYNAME_ERROR;
  ReleaseSocket();
  return false;
}

memset(&sockaddr_in_,0,sizeof(sockaddr_in_));
sockaddr_in_.sin_family = AF_INET;
sockaddr_in_.sin_port = htons(port_);
sockaddr_in_.sin_addr.S_un.S_addr = *(ULONG *)hostent_->h_addr_list[0];

//连接服务器
if(connect(socket_,(sockaddr *)&sockaddr_in_,sizeof(sockaddr_in_)) == SOCKET_ERROR)
{
        errornum_=WSA_CONNECT_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("220")) return false;

//向服务器发送"HELO "+服务器名
string strTmp="HELO "+smtpaddr_+"\r\n";
if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
{
        errornum_=COMMAND_HELO;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("250"))
    {
        errornum_=SERVER_NOT_READY;
        return false;
    }

return true;
}

/**    @fn Validate
*    @brief validate username_ and password_
*    @param
*    @return true if username_ and password_ are correct
*/
bool Validate() {
    if (username_.empty())
    {
        errornum_=UNDEF_USER_NAME;
        return false;
    }
    if (password_.empty())
    {
        errornum_=UNDEF_PASSWORD;
        return false;
    }
ZBase64 base64;

//发送"AUTH LOGIN"
if(send(socket_,"AUTH LOGIN\r\n",strlen("AUTH LOGIN\r\n"),0) == SOCKET_ERROR)
{
        errornum_=COMMAND_AUTH_LOGIN;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("334"))
    {
        errornum_=COMMAND_AUTH_LOGIN;
        return false;
    }

//发送经base64编码的用户名
string strUserName=base64.Encode((unsigned char *)username_.c_str(),username_.length())+"\r\n";
if(send(socket_,strUserName.c_str(),strUserName.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("334")) return false;

//发送经base64编码的密码
string strPassword=base64.Encode((unsigned char *)password_.c_str(),password_.length())+"\r\n";
if(send(socket_,strPassword.c_str(),strPassword.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("235"))
    {
        errornum_=BAD_LOGIN_PASS;
        return false;
    }

return true;
}

/**    @fn Send
*    @brief send an email
*    @param
*    @return true if success
*/
bool Send() {
    if (!Connect())
    {
        return false;
    }
    if (!Validate())
    {
        return false;
    }
if(sendfrom_.empty())
    {
        errornum_=UNDEF_SEND_FROM;
        return false;
    }
if(recipient_.size()<=0)
    {
        errornum_=UNDEF_RECIPIENTS;
        return false;
    }

if (sendername_.empty())
    {
        errornum_=UNDEF_SENDER_NAME;
        return false;
    }
    if (receivername_.empty())
    {
        errornum_=UNDEF_RECEVER_NAME;
        return false;
    }
    if (subject_.empty())
    {
        errornum_=UNDEF_SUBJECT;
        return false;
    }

string strTmp;
ZBase64 base64;

//发送MAIL FROM:<abc@xyz.com>
strTmp="MAIL FROM:<"+sendfrom_+">\r\n";
if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("250"))
    {
        errornum_=COMMAND_MAIL_FROM;
        return false;
    }

//发送RCPT To:<abc@xyz.com>
for(unsigned int i=0;i<recipient_.size();++i)
{
  strTmp="RCPT To:<"+recipient_[i]+">\r\n";
  if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
  {
            errornum_=WSA_SEND_ERROR;
   ReleaseSocket();
   return false;
  }
  if(!CheckResponse("250"))
        {
            errornum_=COMMAND_RCPT_TO;
            return false;
        }
}

//发送"DATA\r\n"
if(send(socket_,"DATA\r\n",strlen("DATA\r\n"),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("354"))
    {
        errornum_=COMMAND_DATA;
        return false;
    }

//"Mail From:sendername_<xxx@mail.com>\r\n"
strTmp="From:"+sendername_+"<"+sendfrom_+">\r\n";

//"subject_: 邮件主题\r\n"
strTmp+="Subject:"+subject_+"\r\n";

//"MIME_Version:1.0\r\n"
strTmp+="MIME_Version:1.0\r\n";

//"X-Mailer:Smtp Client By xxx"//版权信息
strTmp+="X-Mailer:"; strTmp+=COPYRIGHT; strTmp+="\r\n";

//"MIME_Version:1.0\r\n"
strTmp+="MIME_Version:1.0\r\n";

//"content_-type:multipart/mixed;Boundary=xxx\r\n\r\n";
strTmp+="Content-type:multipart/mixed;Boundary=";
strTmp+=BOUNDARY;
strTmp+="\r\n\r\n";

//先将HEADER部分发送过去
if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}

//邮件主体
strTmp="--";
strTmp+=BOUNDARY;
strTmp+="\r\n";
strTmp+=ishtml_ ? "Content-type:text/html;Charset=gb2312\r\n" : "Content-type:text/plain;Charset=gb2312\r\n";
strTmp+="Content-Transfer-Encoding:8bit\r\n\r\n";

//邮件内容
strTmp+=content_+"\r\n\r\n";

//将邮件内容发送出去
if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}

/*
附件处理
对文件内容分段进行base64编码,编码一小段,传送一小段
*/

for(unsigned int i=0;i<files_.size();++i)
{
  strTmp="--";
  strTmp+=BOUNDARY;
  strTmp+="\r\n";

strTmp+="Content-Type:application/octet-stream;Name=";
  strTmp+=files_[i].substr(files_[i].find_last_of("\\")+1).c_str();
  strTmp+="\r\n";
  strTmp+="Content-Disposition:attachment;FileName=";
  strTmp+=files_[i].substr(files_[i].find_last_of("\\")+1).c_str();
  strTmp+="\r\n";
  strTmp+="Content-Transfer-Encoding:Base64\r\n\r\n";

if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
  {
            errornum_=WSA_SEND_ERROR;
   ReleaseSocket();
   return false;
  }
  errno_t err;
  FILE* fin;
  err=fopen_s(&fin,files_[i].c_str(),"rb");
        if (err!=0)
        {
            errornum_=OPEN_FILE_ERROR;
        }
        char* Buf=new(std::nothrow) char[BUFFER_READ+1];
        if (Buf==NULL)
        {
            errornum_=LACK_OF_MEMORY;
            return false;
        }
  memset(Buf,0,BUFFER_READ+1);
  size_t ReadSize=fread(Buf,sizeof(char),BUFFER_READ,fin);
  while((ReadSize>0))
  {

   strTmp=base64.Encode((unsigned char*)Buf,ReadSize);
   if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
   {
                errornum_=WSA_SEND_ERROR;
    ReleaseSocket();
    return false;
   }
   memset(Buf,0,BUFFER_READ+1);
   ReadSize=fread(Buf,1,BUFFER_READ,fin);
  }
  delete[] Buf;
  fclose(fin);
} // end for

//界尾
strTmp="--";
strTmp+=BOUNDARY;
strTmp+="--\r\n.\r\n";

if(send(socket_,strTmp.c_str(),strTmp.length(),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("250"))
    {
        errornum_=SERVER_NOT_READY;
        return false;
    }

//退出
if(send(socket_,"QUIT\r\n",strlen("QUIT\r\n"),0) == SOCKET_ERROR)
{
        errornum_=WSA_SEND_ERROR;
  ReleaseSocket();
  return false;
}
if(!CheckResponse("221"))
    {
        errornum_=COMMAND_QUIT;
        return false;
    }
ReleaseSocket();
return true;
}

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