/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager system settings service
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * (C) Copyright 2010 Red Hat, Inc.
 */

#include <glib.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"


static const char temp_letters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

/*
 * Check '.[a-zA-Z0-9]{6}' file suffix used for temporary files by g_file_set_contents() (mkstemp()).
 */
static gboolean
check_mkstemp_suffix (const char *path)
{
	const char *ptr;

	g_return_val_if_fail (path != NULL, FALSE);

	/* Matches *.[a-zA-Z0-9]{6} suffix of mkstemp()'s temporary files */
	ptr = strrchr (path, '.');
	if (ptr && (strspn (ptr + 1, temp_letters) == 6) && (! ptr[7]))
		return TRUE;
	return FALSE;
}

static gboolean
check_prefix (const char *base, const char *tag)
{
	int len, tag_len;

	g_return_val_if_fail (base != NULL, TRUE);
	g_return_val_if_fail (tag != NULL, TRUE);

	len = strlen (base);
	tag_len = strlen (tag);
	if ((len > tag_len) && !strncasecmp (base, tag, tag_len))
		return TRUE;
	return FALSE;
}

static gboolean
check_suffix (const char *base, const char *tag)
{
	int len, tag_len;

	g_return_val_if_fail (base != NULL, TRUE);
	g_return_val_if_fail (tag != NULL, TRUE);

	len = strlen (base);
	tag_len = strlen (tag);
	if ((len > tag_len) && !strcasecmp (base + len - tag_len, tag))
		return TRUE;
	return FALSE;
}

#define SWP_TAG ".swp"
#define SWPX_TAG ".swpx"
#define PEM_TAG ".pem"
#define DER_TAG ".der"

gboolean
nm_keyfile_plugin_utils_should_ignore_file (const char *filename)
{
	char *base;
	gboolean ignore = FALSE;

	g_return_val_if_fail (filename != NULL, TRUE);

	base = g_path_get_basename (filename);
	g_return_val_if_fail (base != NULL, TRUE);

	/* Ignore files with certain patterns */
	if (   (check_prefix (base, ".") && check_suffix (base, SWP_TAG))   /* vim temporary files: .filename.swp */
	    || (check_prefix (base, ".") && check_suffix (base, SWPX_TAG))  /* vim temporary files: .filename.swpx */
	    || check_suffix (base, PEM_TAG)                                 /* 802.1x certificates and keys */
	    || check_suffix (base, DER_TAG)                                 /* 802.1x certificates and keys */
	    || check_mkstemp_suffix (base)                                  /* temporary files created by mkstemp() */
	    || check_prefix (base, ".#")                                    /* Emacs locking file (link) */
	    || base[strlen (base) - 1] == '~')
		ignore = TRUE;

	g_free (base);
	return ignore;
}

