/*
 * Check decoding of faccessat2 syscall.
 *
 * Copyright (c) 2016-2021 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "tests.h"
#include "scno.h"

#include "xmalloc.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>

#define XLAT_MACROS_ONLY
# include "xlat/faccessat_flags.h"
#undef XLAT_MACROS_ONLY

#ifndef FD_PATH
# define FD_PATH ""
#else
# define YFLAG
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif

static const char *errstr;

static long
k_faccessat2(const unsigned int dirfd,
	     const void *const pathname,
	     const unsigned int mode,
	     const unsigned int flags)
{
	const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
	const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;

	const kernel_ulong_t arg1 = fill | dirfd;
	const kernel_ulong_t arg2 = (uintptr_t) pathname;
	const kernel_ulong_t arg3 = fill | mode;
	const kernel_ulong_t arg4 = fill | flags;
	const long rc = syscall(__NR_faccessat2,
				arg1, arg2, arg3, arg4, bad, bad);
	errstr = sprintrc(rc);
	return rc;
}

int
main(void)
{
	SKIP_IF_PROC_IS_UNAVAILABLE;

	TAIL_ALLOC_OBJECT_CONST_PTR(const char, unterminated);
	char *unterminated_str = xasprintf("%p", unterminated);
	const void *const efault = unterminated + 1;
	char *efault_str = xasprintf("%p", efault);

	typedef struct {
		char sym;
		char null;
	} sym_null;

	TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, dot);
	dot->sym = '.';
	dot->null = '\0';
	const char *const null = &dot->null;

	TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, slash);
	slash->sym = '/';
	slash->null = '\0';

	static const char path[] = "/dev/full";
	const char *const fd_path = tail_memdup(path, sizeof(path));
        int fd = open(path, O_WRONLY);
        if (fd < 0)
                perror_msg_and_fail("open: %s", path);
	char *fd_str = xasprintf("%d%s", fd, FD_PATH);
	const char *at_fdcwd_str =
#ifdef YFLAG
		xasprintf("AT_FDCWD<%s>", get_fd_path(get_dir_fd(".")));
#else
		"AT_FDCWD";
#endif

	char *path_quoted = xasprintf("\"%s\"", path);

	struct {
		int val;
		const char *str;
	} dirfds[] = {
		{ ARG_STR(-1) },
		{ -100, at_fdcwd_str },
		{ fd, fd_str },
	}, modes[] = {
		{ ARG_STR(F_OK) },
		{ ARG_STR(R_OK) },
		{ ARG_STR(W_OK) },
		{ ARG_STR(X_OK) },
		{ ARG_STR(R_OK|W_OK) },
		{ ARG_STR(R_OK|X_OK) },
		{ ARG_STR(W_OK|X_OK) },
		{ ARG_STR(R_OK|W_OK|X_OK) },
		{ 8, "0x8 /* ?_OK */" },
		{ -1, "R_OK|W_OK|X_OK|0xfffffff8" },
	}, flags[] = {
		{ ARG_STR(0) },
		{ ARG_STR(AT_SYMLINK_NOFOLLOW) },
		{ ARG_STR(AT_EACCESS) },
		{ ARG_STR(AT_EMPTY_PATH) },
		{ ARG_STR(AT_SYMLINK_NOFOLLOW|AT_EACCESS) },
		{ ARG_STR(AT_SYMLINK_NOFOLLOW|AT_EMPTY_PATH) },
		{ ARG_STR(AT_EACCESS|AT_EMPTY_PATH) },
		{ ARG_STR(AT_SYMLINK_NOFOLLOW|AT_EACCESS|AT_EMPTY_PATH) },
		{ 1, "0x1 /* AT_??? */" },
		{ -1, "AT_SYMLINK_NOFOLLOW|AT_EACCESS|AT_EMPTY_PATH|0xffffecff" },
	};

	struct {
		const void *val;
		const char *str;
	} paths[] = {
		{ 0, "NULL" },
		{ efault, efault_str },
		{ unterminated, unterminated_str },
		{ null, "\"\"" },
		{ &dot->sym, "\".\"" },
		{ &slash->sym, "\"/\"" },
		{ fd_path, path_quoted },
	};

	for (unsigned int dirfd_i = 0;
	     dirfd_i < ARRAY_SIZE(dirfds);
	     ++dirfd_i) {
		for (unsigned int path_i = 0;
		     path_i < ARRAY_SIZE(paths);
		     ++path_i) {
			for (unsigned int mode_i = 0;
			     mode_i < ARRAY_SIZE(modes);
			     ++mode_i) {
				for (unsigned int flag_i = 0;
				     flag_i < ARRAY_SIZE(flags);
				     ++flag_i) {
					k_faccessat2(dirfds[dirfd_i].val,
						    paths[path_i].val,
						    modes[mode_i].val,
						    flags[flag_i].val);
#ifdef PATH_TRACING
					if (dirfds[dirfd_i].val == fd ||
					    paths[path_i].val == fd_path)
#endif
					printf("faccessat2(%s, %s, %s, %s) = %s\n",
					       dirfds[dirfd_i].str,
					       paths[path_i].str,
					       modes[mode_i].str,
					       flags[flag_i].str,
					       errstr);
				}
			}
		}
	}

	puts("+++ exited with 0 +++");
	return 0;
}