/*-
 * Copyright (c) 2011 Juan Romero Pardines.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <sys/param.h>

#include <xbps_api.h>
#include "defs.h"

/*
 * Checks package integrity of an installed package.
 * The following tasks are processed in that order:
 *
 * 	o Check for missing installed files.
 *
 * 	o Check the hash for all installed files, except
 * 	  configuration files (which is expected if they are modified).
 *
 * Return 0 if test ran successfully, 1 otherwise and -1 on error.
 */
int
check_pkg_files(prop_dictionary_t pkgd_regpkgdb,
		prop_dictionary_t pkg_propsd,
		prop_dictionary_t pkg_filesd)
{
	struct xbps_handle *xhp = xbps_handle_get();
	prop_array_t array;
	prop_object_t obj;
	prop_object_iterator_t iter;
	const char *pkgname, *file, *sha256;
	char *path;
	int rv = 0;
	bool broken = false, test_broken = false;

	(void)pkg_propsd;
	prop_dictionary_get_cstring_nocopy(pkgd_regpkgdb, "pkgname", &pkgname);

	array = prop_dictionary_get(pkg_filesd, "files");
	if ((prop_object_type(array) == PROP_TYPE_ARRAY) &&
	     prop_array_count(array) > 0) {
		iter = xbps_array_iter_from_dict(pkg_filesd, "files");
		if (iter == NULL)
			return -1;

		while ((obj = prop_object_iterator_next(iter))) {
			prop_dictionary_get_cstring_nocopy(obj, "file", &file);
			path = xbps_xasprintf("%s/%s", xhp->rootdir, file);
			if (path == NULL) {
				prop_object_iterator_release(iter);
				return -1;
			}
                        prop_dictionary_get_cstring_nocopy(obj,
                            "sha256", &sha256);
			rv = xbps_file_hash_check(path, sha256);
			switch (rv) {
			case 0:
				break;
			case ENOENT:
				xbps_error_printf("%s: unexistent file %s.\n",
				    pkgname, file);
				test_broken = true;
				break;
			case ERANGE:
                                xbps_error_printf("%s: hash mismatch for %s.\n",
				    pkgname, file);
				test_broken = true;
				break;
			default:
				xbps_error_printf(
				    "%s: can't check `%s' (%s)\n",
				    pkgname, file, strerror(rv));
				break;
			}
			free(path);
                }
                prop_object_iterator_release(iter);
	}
	if (test_broken) {
		xbps_error_printf("%s: files check FAILED.\n", pkgname);
		test_broken = false;
		broken = true;
	}

	/*
	 * Check for missing configuration files.
	 */
	array = prop_dictionary_get(pkg_filesd, "conf_files");
	if (array && prop_object_type(array) == PROP_TYPE_ARRAY &&
	    prop_array_count(array) > 0) {
		iter = xbps_array_iter_from_dict(pkg_filesd, "conf_files");
		if (iter == NULL)
			return -1;

		while ((obj = prop_object_iterator_next(iter))) {
			prop_dictionary_get_cstring_nocopy(obj, "file", &file);
			path = xbps_xasprintf("%s/%s", xhp->rootdir, file);
			if (path == NULL) {
				prop_object_iterator_release(iter);
				return -1;
			}
			if ((rv = access(path, R_OK)) == -1) {
				if (errno == ENOENT) {
					xbps_error_printf(
					    "%s: unexistent file %s\n",
					    pkgname, file);
					test_broken = true;
				} else
					xbps_error_printf(
					    "%s: can't check `%s' (%s)\n",
					    pkgname, file,
					    strerror(errno));
			}
			free(path);
		}
		prop_object_iterator_release(iter);
	}
	if (test_broken) {
		xbps_error_printf("%s: conf files check FAILED.\n", pkgname);
		broken = true;
	}

	return broken;
}