/* pdumpq - Pcap Dump for Linux/Netfilter QUEUE
 *
 * Copyright (C) 2001 Ian Jones <roux@speakeasy.org>
 *
 * 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
 * of the License, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <app.h>

/* init for mail buffer */
void
mail_init (void)
{
  char *decoder;
  if (access (decoder = strndup (MAILCMD, strcspn (MAILCMD, " ")), X_OK) != 0)
    crash (decoder);
  if ((queue = malloc (sizeof (Queue))) == NULL)
    crash ("malloc:mail_init");
  memset (queue, 0, sizeof (Queue));
  queue->stream = open_memstream (&queue->queue, &queue->size);
  if (write_file_header (queue->stream) != 1)
    crash ("mail_init, write_file_header");
}

/* save pkt to buffer, set ALRM if it's the first */
void
mail_enqueue (ipq_packet_msg_t * m)
{
  if (dump_pkt (m, queue->stream))
    queue->num++;
  else
    crash ("enqueueing mail buffer:pdumpq");
  if (queue->num == 1)
    alarm (v.timer);		/* set the timer, first alert in queue */
  if (queue->num == v.maxq)
    queue->flush = 1;		/* flush to mail if capacity is reached */
}

/* flush to mail and reset buffer */
void
mail (void)
{
  int nbytes;
  FILE *mailst;
  char email[strlen (MAILCMD) + strlen (v.email) + 1];
  stpcpy (stpcpy (email, MAILCMD), v.email);
  alarm (0);
  if ((mailst = popen (email, "w")) == NULL)
    crash (email);
  for (nbytes = 0; nbytes < queue->size;
       nbytes +=
       TEMP_FAILURE_RETRY (write
			   (fileno (mailst), queue->queue, queue->size)));
  fflush (mailst);
  syslog (LOG_INFO, "Flushed %d packets to mail", queue->num);
  if (pclose (mailst) == -1)
    crash ("closing mail()");

  rewind (queue->stream);
  if (write_file_header (queue->stream) != 1)
    crash ("mail(), write_file_header");
  queue->num = queue->flush = 0;
}