handler.c

这是有名的＜＜嵌入式系统TCP/IP应用层协议＞＞,M.Tim Jones 著

/*
 *  Embedded SMTP Server Handler Function Examples
 *
 *  ./software/ch5/emsmtpd/handler.c
 *
 *  [e-mail]
 *
 *  Copyright 2001,2002 M. Tim Jones <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 */

#include <unistd.h>
#include <stdio.h>
#include "server.h"
#include "client.h"

/*
 *  emitStatusResponse()
 *
 *  Emits a "device status" response to the sender of the mail
 *  referenced by the passed argument 'mail'.
 *
 */

int emitStatusResponse( parseMailType *mail )
{
  struct mailHeader response;
  char   buffer[512];

  memset(&response, 0, sizeof(struct mailHeader));

  /* Make the sender the new recipient */
  strcpy(response.recipient, mail->sender);

  /* Acknowledge receipt of the message */
  strcpy(response.subject, "Device Status");

  strcpy(response.contentType, "text/plain");

  response.contents = buffer;
  memset(response.contents, 0, sizeof(buffer));

  sprintf(response.contents, 
          "Received status request from %s.\n\n", mail->sender);

  sendMail(&response);

  return(0);
}


/*
 *  emitUpdateResponse()
 *
 *  Emits an "update status" response to the sender of the mail
 *  referenced by the passed argument 'mail'.
 *
 */

int emitUpdateResponse( parseMailType  *mail )
{
  struct mailHeader response;
  char   buffer[512];

  memset(&response, 0, sizeof(struct mailHeader));

  /* Make the sender the new recipient */
  strcpy(response.recipient, mail->sender);

  /* Acknowledge receipt of the message */
  strcpy(response.subject, "Received Attachment");

  strcpy(response.contentType, "text/plain");

  response.contents = buffer;

  if (mail->attachlen) {
    sprintf(response.contents,
            "Received email attachment from %s.\n\n", mail->sender );
    sprintf(&response.contents[strlen(response.contents)],
            "File was %s of size %d\n", mail->filename, mail->attachlen);
  } else {
    sprintf(response.contents,
            "Error- Received no email attachment from %s.\n\n", mail->sender );
  }

  sendMail(&response);

  return(0);
}