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smtp.c

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/**
 * \file smtp.c
 * \brief This file has SMTP related code
 *
 * \author Fernando J. Pereda <ferdy@ferdyx.org>
 * \author Ricardo Cervera Navarro <ricardo@zonasiete.org>
 *
 * This is part of nbsmtp. nbsmtp 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
 * of the License, or (at your option) any later version.
 *
 * nbsmtp 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with nbsmtp; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * See COPYING for details.
 */

#include <stdio.h>
#include <syslog.h>
#include <stdlib.h>
#include <string.h>

#include "fdutil.h"
#include "smtp.h"
#include "util.h"

/**
 * \brief Las message from the server
 */
00038 char *smtp_stored_message;

/**
 * \brief Calls fd_puts appending CR LF
 *
 * \param[in] serverinfo      A pointer to a servinfo_t struct with the socket information
 * \param[in] str       A pointer to the string to be written
 * \returns We return what fd_puts returns
 * \see fd_puts()
 */
00048 ssize_t smtp_write(servinfo_t *serverinfo, char *str)
{
      char *buf;
      ssize_t ret;

      asprintf(&buf,"%s\r\n",str);

      ret = fd_puts(serverinfo,buf,strlen(buf));
      log_msg(LOG_DEBUG,"[->] %s",buf);
      free(buf);

      return ret;
}

/**
 * \brief Returns the last message from the server
 *
 * \returns A pointer to the string with the last message from the server
 */
00067 char *smtp_last_message()
{
      return smtp_stored_message;
}

/**
 * \brief Gets a line from a socket an returns its first digit ( borrowed from sSMTP )
 *
 * \param[in]     serverinfo  A pointer to a servinfo_t struct with the socket information
 * \param[out]    response    A pointer where we will store the line read
 * \returns The first digit of the line we read
 * \see fd_gets()
 */
00080 int smtp_read(servinfo_t *serverinfo, char *response)
{
      char *p;

      do
      {
            if (fd_gets(response,BUF_SIZE,serverinfo)==NULL)
            {
                  return 0;
            }

            log_msg(LOG_DEBUG,"[<-] %s",response);
      } while (response[3]=='-');


      /* Free last message if neccesary */
      if (smtp_stored_message!=NULL)
      {
            free(smtp_stored_message);
      }


      /* Find the first space (numbers finish there) */
      p = strchr(response,' ');

      /* Avoid possible missbehavior */
      if (p != NULL)
      {
            p++;

            smtp_stored_message = (char *)strdup(p);
      }
      else
      {
            smtp_stored_message = (char *)strdup("");
      }

      return(atoi(response)/100); /* response[0] ? */
}

/**
 * \brief Gets a line using smtp_read and if it returns 2 we return 1 (borrowed from sSMTP)
 *
 * \param[in] serverinfo A pointer to a servinfo_t struct with the socket info
 * \return 1 if smtp_read returns 2 and 0 in other case
 * \see smtp_read()
 */
00127 int smtp_okay(servinfo_t *serverinfo)
{
      char response[BUF_SIZE];

      return((smtp_read(serverinfo,response)==2) ? 1 : 0);
}

/**
 * \brief Writes data to the socket (actually it writes the message body and headers)
 *
 * \param[in] serverinfo      A pointer to a servinfo_t structure with the information needed
 * \param[in] msg             A pointer to the buffer with the message
 * \param[in] length          An integer with the number of bytes to be written
 * \return 1 in case of error, 0 if everything goes allright
 */
00142 int smtp_write_data(servinfo_t *serverinfo, char *msg, int length)
{
      char *p;
      int i = 0; /* Avoid segfault if msg[0]=='\n' or msg[0]=='.' */
      char r = '\r';
      char dot = '.';

      for ( p = msg ; *p && i < length; p++ )
      {
            if (*p=='\n')
            {
                  if (i>0 && *(p-1)!='\r')
                  {
                        if (fd_putc(serverinfo,&r)<1)
                        {
                              return 1;
                        }
                  }
                  else if (i==0)
                  {
                        if (fd_putc(serverinfo,&r)<1)
                        {
                              return 1;
                        }
                  }
            }
            else if (*p=='.' && i>0 && *(p-1)=='\n')
            {
                  if (fd_putc(serverinfo,&dot)<1)
                  {
                        return 1;
                  }
            }

            if (fd_putc(serverinfo,p)<1)
            {
                  return 1;
            }

            i++;
      }

      return 0;
}

/**
 * \brief Cleans up the smtp module
 */
00190 void smtp_exit(void)
{
      if (smtp_stored_message)
      {
            free(smtp_stored_message);
      }

      return;
}

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