/*  MasqMail
    Copyright (C) 2000-2001 Oliver Kurth
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <sys/wait.h>

#include "masqmail.h"
#include "peopen.h"
#include "readsock.h"

gboolean fail_msg(message *msg, gchar *template,
		  GList *failed_rcpts, gchar *err_fmt, va_list args)
{
  gboolean ok = FALSE;
  address *ret_path = NULL;

  /* do not bounce bounces, send to postmaster instead */
  if(msg->return_path->local_part[0] == 0){
    GList *node;

    ret_path = create_address_qualified("postmaster", TRUE, conf.host_name);
    foreach(failed_rcpts, node){
      address *addr = (address *)(node->data);
      if(addr_isequal_parent(addr, ret_path)){
	logwrite(LOG_ALERT, "%s == %s: postmaster address failed\n",
		 msg->uid, addr_string(ret_path));
	return FALSE;
      }
    }
  }else
    ret_path = copy_address(msg->return_path);

  DEBUG(1) debugf("sending failure notice to %s.\n", addr_string(ret_path));

  if(template){
    FILE *file;
    GList *var_table = var_table_conf(var_table_msg(NULL, msg));
    gchar *err_msg = g_strdup_vprintf(err_fmt, args);

    var_table = g_list_prepend(var_table, create_pair_string("err_msg", err_msg));
    g_free(err_msg);

    if((file = fopen(template, "r"))){
      FILE *out;
      gchar *cmd;
      pid_t pid;

      //      cmd = g_strdup_printf(SBINDIR"/masqmail -oi -f \"<>\" %s@%s",
      //			    ret_path->local_part, ret_path->domain);
      cmd = g_strdup_printf(SBINDIR"/masqmail -oi -f <> %s@%s",
			    ret_path->local_part, ret_path->domain);
      if((out = peidopen(cmd, "w", environ, &pid, conf.mail_uid, conf.mail_gid))){
	gchar fmt[256], line[256];
	int status, ret;

	while((ret = read_sockline(file, fmt, 256, 0, 0)) > 0){
	  if(fmt[0] == '@'){
	    GList *node;
	    if(strncmp(fmt, "@failed_rcpts", 13) == 0){
	      foreach(failed_rcpts, node){
		address *rcpt = (address *)(node->data);
		fprintf(out, "\t%s\n", addr_string(rcpt));
	      }
	    }else if(strncmp(fmt, "@msg_headers", 12) == 0){
	      foreach(msg->hdr_list, node){
		header *hdr = (header *)(node->data);
		fputs(hdr->header, out);
	      }
	    }else if(strncmp(fmt, "@msg_body", 9) == 0){
	      /* we may have to read the data at this point
		 and remember if we did */
	      gboolean flag = (msg->data_list == NULL);
	      if(flag){
		if(!spool_read_data(msg)){
		  logwrite(LOG_ALERT, "could not open data spool file %s\n",
			   msg->uid);
		}
	      }
	      foreach(msg->data_list, node){
		gchar *line = (gchar *)(node->data);
		fputs(line, out);
	      }
	      if(flag) msg_free_data(msg);
	    }
	  }else{
	    expand(var_table, fmt, line, 256);
	    fputs(line, out);
	  }
	}

	fclose(out);
	waitpid(pid, &status, 0);
	if((WEXITSTATUS(status) != EXIT_SUCCESS) || WIFSIGNALED(status)){
	  if(WEXITSTATUS(status) != EXIT_SUCCESS)
	    logwrite(LOG_WARNING, "child returned %d\n", WEXITSTATUS(status));
	  if(WIFSIGNALED(status))
	    logwrite(LOG_WARNING, "child got signal: %d\n", WTERMSIG(status));
	}else ok = TRUE;
      }else{
	logwrite(LOG_ERR, "peopen failed: %s\n", strerror(errno));
      }
      g_free(cmd);
      fclose(file);
    }else
      logwrite(LOG_ALERT, "could not open failure message template %s: %s\n",
	       conf.errmsg_file, strerror(errno));

    destroy_table(var_table);
  }
    
  destroy_address(ret_path);

  return ok;
}

/*
ival  : |--|--|----|--------|--------|
warned: |-------W-------------W------
result: |nnnyyyynnnnyyyyyyyyyynnnnnnn
*/

static
gboolean warn_msg_is_due(message *msg)
{
  time_t now = time(NULL);
  gint dummy;
  
  GList *node;
  for(node = g_list_last(conf.warn_intervals); node; node = g_list_previous(node)){
    gchar *str_ival = (gchar *)(node->data);
    gint ival = time_interval(str_ival, &dummy);
    if(ival >= 0){
      DEBUG(5) debugf("ival = %d\n", ival);
      DEBUG(5) debugf("now - msg->received_time = %d\n", now - msg->received_time);
      if((now - msg->received_time) > ival){
	if(msg->warned_time != 0){
	  if((msg->warned_time - msg->received_time) < ival)
	    return TRUE;
	}else
	  return TRUE;
      }
    }else
      logwrite(LOG_WARNING, "invalid time interval: %s\n", str_ival);
  }
  return FALSE;
}

gboolean warn_msg(message *msg, gchar *template,
		  GList *defered_rcpts, gchar *err_fmt, va_list args)
{
  time_t now = time(NULL);

  if(warn_msg_is_due(msg)){
    if(fail_msg(msg, template, defered_rcpts, err_fmt, args)){
      msg->warned_time = now;
      return TRUE;
    }else
      return FALSE;
  }
  return TRUE;
}