With the addition of so many new scoping flags, it's necessary to have
some sort of validation that they really work. There were no vfs
self-tests in the past, so this also includes a basic framework that
future VFS tests can use.
Signed-off-by: Aleksa Sarai <cyp...@cyphar.com>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/vfs/.gitignore | 1 +
tools/testing/selftests/vfs/Makefile | 13 ++
tools/testing/selftests/vfs/at_flags.h | 40 +++++
tools/testing/selftests/vfs/common.sh | 37 +++++
.../selftests/vfs/tests/0001_at_beneath.sh | 72 ++++++++
.../selftests/vfs/tests/0002_at_xdev.sh | 54 ++++++
.../vfs/tests/0003_at_no_proclinks.sh | 50 ++++++
.../vfs/tests/0004_at_no_symlinks.sh | 49 ++++++
.../selftests/vfs/tests/0005_at_this_root.sh | 66 ++++++++
tools/testing/selftests/vfs/vfs_helper.c | 154 ++++++++++++++++++
11 files changed, 537 insertions(+)
create mode 100644 tools/testing/selftests/vfs/.gitignore
create mode 100644 tools/testing/selftests/vfs/Makefile
create mode 100644 tools/testing/selftests/vfs/at_flags.h
create mode 100644 tools/testing/selftests/vfs/common.sh
create mode 100755 tools/testing/selftests/vfs/tests/0001_at_beneath.sh
create mode 100755 tools/testing/selftests/vfs/tests/0002_at_xdev.sh
create mode 100755 tools/testing/selftests/vfs/tests/0003_at_no_proclinks.sh
create mode 100755 tools/testing/selftests/vfs/tests/0004_at_no_symlinks.sh
create mode 100755 tools/testing/selftests/vfs/tests/0005_at_this_root.sh
create mode 100644 tools/testing/selftests/vfs/vfs_helper.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index f1fe492c8e17..6f814e49071f 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -43,6 +43,7 @@ ifneq (1, $(quicktest))
TARGETS += timers
endif
TARGETS += user
+TARGETS += vfs
TARGETS += vm
TARGETS += x86
TARGETS += zram
diff --git a/tools/testing/selftests/vfs/.gitignore
b/tools/testing/selftests/vfs/.gitignore
new file mode 100644
index 000000000000..c57ebcba14c0
--- /dev/null
+++ b/tools/testing/selftests/vfs/.gitignore
@@ -0,0 +1 @@
+/vfs_helper
diff --git a/tools/testing/selftests/vfs/Makefile
b/tools/testing/selftests/vfs/Makefile
new file mode 100644
index 000000000000..8ca3cef43dc3
--- /dev/null
+++ b/tools/testing/selftests/vfs/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+# Makefile for mount selftests.
+CFLAGS = -Wall \
+ -O2 \
+ -I../../../../usr/include/
+
+TEST_PROGS := $(wildcard tests/*.sh)
+TEST_GEN_FILES := vfs_helper
+
+include ../lib.mk
diff --git a/tools/testing/selftests/vfs/at_flags.h
b/tools/testing/selftests/vfs/at_flags.h
new file mode 100644
index 000000000000..a8ca8f689753
--- /dev/null
+++ b/tools/testing/selftests/vfs/at_flags.h
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Aleksa Sarai <cyp...@cyphar.com>
+ * Copyright (C) 2018 SUSE LLC.
+ */
+
+#ifndef __AT_FLAGS_H__
+#define __AT_FLAGS_H__
+
+/* These come from <uapi/asm-generic/linux/fcntl.h> */
+#ifndef O_BENEATH
+# define O_BENEATH 00040000000
+# define O_XDEV 00100000000
+# define O_NOPROCLINKS 00200000000
+# define O_NOSYMLINKS 01000000000
+# define O_THISROOT 02000000000
+#endif
+#ifndef AT_BENEATH
+# define AT_BENEATH 0x8000
+# define AT_XDEV 0x10000
+# define AT_NO_PROCLINKS 0x20000
+# define AT_NO_SYMLINKS 0x40000
+# define AT_THIS_ROOT 0x80000
+#endif
+
+struct flag {
+ const char *name;
+ unsigned int at_flag, open_flag;
+};
+
+struct flag AT_FLAGS[] = {
+ { .name = "beneath", .at_flag = AT_BENEATH, .open_flag =
O_BENEATH },
+ { .name = "xdev", .at_flag = AT_XDEV, .open_flag =
O_XDEV },
+ { .name = "no_proclinks", .at_flag = AT_NO_PROCLINKS, .open_flag =
O_NOPROCLINKS },
+ { .name = "no_symlinks", .at_flag = AT_NO_SYMLINKS, .open_flag =
O_NOSYMLINKS },
+ { .name = "this_root", .at_flag = AT_THIS_ROOT, .open_flag =
O_THISROOT },
+ { 0 }, /* terminate */
+};
+
+#endif /* !defined(__AT_FLAGS_H__) */
diff --git a/tools/testing/selftests/vfs/common.sh
b/tools/testing/selftests/vfs/common.sh
new file mode 100644
index 000000000000..82ac8ad2a5a5
--- /dev/null
+++ b/tools/testing/selftests/vfs/common.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+set -e -o pipefail
+
+tmpdir="$(mktemp -d --tmpdir vfs_test.XXXXXX)"
+trap "rm -rf $tmpdir" EXIT
+
+root="$tmpdir/root"
+mkdir -p "$root"
+
+function fail() {
+ echo "# not ok" "$@"
+ exit 1
+}
+
+ksft_skip=4
+function skip() {
+ echo "# skip" "$@"
+ exit "$ksft_skip"
+}
+
+function run() {
+ local old_flags="$-"
+ set +eET
+ output="$("$@" 2>&1)"
+ status="$?"
+ set "-$old_flags"
+}
+
+testrootdir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+function vfs_helper() {
+ run "$testrootdir/vfs_helper" "$@"
+}
+vfs_ops=( "open" "stat" "lstat" )
diff --git a/tools/testing/selftests/vfs/tests/0001_at_beneath.sh
b/tools/testing/selftests/vfs/tests/0001_at_beneath.sh
new file mode 100755
index 000000000000..9a03b0953032
--- /dev/null
+++ b/tools/testing/selftests/vfs/tests/0001_at_beneath.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+sourcedir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+source "$sourcedir/../common.sh"
+
+touch "$root/inside"
+ln -s / "$root/rootlink"
+ln -s .. "$root/dotdot"
+ln -s "/../../../../../../$root" "$root/badlink"
+
+mkdir -p "$root/subdir"
+ln -s ../inside "$root/subdir/dotdotinside"
+ln -s ../subdir "$root/subdir/dotdotsubdir"
+ln -s subdir "$root/subdirlink"
+ln -s ../subdirlink/../../inside "$root/subdir/complexlink"
+
+for op in "${vfs_ops[@]}"
+do
+ vfs_helper -o "$op" -F beneath -d "$root" ..
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath [/root/].."
+
+ vfs_helper -o "$op" -F beneath -d "$root" ../root
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]../root"
+
+ vfs_helper -o "$op" -F beneath -d "$root" dotdot/root
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]dotdot(=..)/root"
+
+ vfs_helper -o "$op" -F beneath -d "$root" "$root"
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]/root"
+
+ vfs_helper -o "$op" -F beneath -d "$root" rootlink
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op beneath [/root/]rootlink(=/)"
+ else
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]rootlink(=/)"
+ fi
+
+ vfs_helper -o "$op" -F beneath -d "$root" rootlink/
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]rootlink(=/)/"
+
+ vfs_helper -o "$op" -F beneath -d "$root" "rootlink/$root"
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]rootlink(=/)/root"
+
+ vfs_helper -o "$op" -F beneath -d "$root" badlink
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op beneath
[/root/]badlink(=/../.../root)"
+ else
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]badlink(=/../.../root)"
+ fi
+
+ vfs_helper -o "$op" -F beneath -d "$root" subdir/../inside
+ [[ "$status" -eq 0 ]] || fail "$op beneath [/root/]subdir/../inside"
+
+ vfs_helper -o "$op" -F beneath -d "$root" subdir/dotdotinside
+ [[ "$status" -eq 0 ]] || fail "$op beneath
[/root/]subdir/dotdotinside(=../inside)"
+
+ vfs_helper -o "$op" -F beneath -d "$root" subdir/dotdotsubdir/
+ [[ "$status" -eq 0 ]] || fail "$op beneath
[/root/]subdir/dotdotsubdir(=../subdir)/"
+
+ vfs_helper -o "$op" -F beneath -d "$root" subdir/complexlink
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op beneath
[/root/]complexlink(=../subdirlink/../../inside)"
+ else
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op beneath
[/root/]complexlink(=../subdirlink/../../inside)"
+ fi
+done
diff --git a/tools/testing/selftests/vfs/tests/0002_at_xdev.sh
b/tools/testing/selftests/vfs/tests/0002_at_xdev.sh
new file mode 100755
index 000000000000..06be58a8ffe7
--- /dev/null
+++ b/tools/testing/selftests/vfs/tests/0002_at_xdev.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+sourcedir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+source "$sourcedir/../common.sh"
+
+( mountpoint -q "/tmp" ) || skip "/tmp is not a mountpoint"
+
+touch /tmp/foo
+
+ln -s /tmp "$root/link_tmp"
+
+for op in "${vfs_ops[@]}"
+do
+ vfs_helper -o "$op" -F xdev -d / tmp/
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/]tmp/"
+
+ vfs_helper -o "$op" -F xdev -d / tmp/foo
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/]tmp/foo"
+
+ vfs_helper -o "$op" -F xdev -d "$root" /tmp
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/root/]/tmp"
+
+ vfs_helper -o "$op" -F xdev -d "$root" /tmp/
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/root/]/tmp/"
+
+ vfs_helper -o "$op" -F xdev -d "$root" /tmp/foo
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev
[/root/]/tmp/foo"
+
+ vfs_helper -o "$op" -F xdev -d /tmp foo
+ [[ "$status" = 0 ]] || fail "$op xdev [/tmp/]foo"
+
+ vfs_helper -o "$op" -F xdev -d /tmp ..
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/tmp/].."
+
+ vfs_helper -o "$op" -F xdev -d /tmp ../
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/tmp/]../"
+
+ vfs_helper -o "$op" -F xdev -d /tmp ../tmp
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev [/tmp/]../tmp"
+
+ vfs_helper -o "$op" -F xdev -d "$root" link_tmp
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op xdev [/root/]link_tmp(=/tmp)"
+ else
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev
[/root/]link_tmp(=/tmp)"
+ fi
+
+ vfs_helper -o "$op" -F xdev -d "$root" link_tmp/
+ [[ "$(errno "$status")" =~ "EXDEV "* ]] || fail "$op xdev
[/root/]link_tmp(=/tmp)/"
+done
diff --git a/tools/testing/selftests/vfs/tests/0003_at_no_proclinks.sh
b/tools/testing/selftests/vfs/tests/0003_at_no_proclinks.sh
new file mode 100755
index 000000000000..41d9655a1e46
--- /dev/null
+++ b/tools/testing/selftests/vfs/tests/0003_at_no_proclinks.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+sourcedir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+source "$sourcedir/../common.sh"
+
+[ -e "/proc/$$/cwd" ] || skip "/proc/$$/cwd doesn't exist"
+
+ln -s / "$root/testlink"
+
+for op in "${vfs_ops[@]}"
+do
+ for flags in {no_proclinks,no_symlinks,"no_proclinks,no_symlinks"}
+ do
+ vfs_helper -o "$op" -F "$flags" "/proc/$$/stat"
+ [[ "$status" = 0 ]] || fail "$op $flags /proc/$$/stat"
+
+ vfs_helper -o "$op" -F "$flags" "/proc/$$/cwd"
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op $flags /proc/$$/cwd"
+ else
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op
$flags /proc/$$/cwd"
+ fi
+
+ vfs_helper -o "$op" -F "$flags" -d "$root" "testlink/"
+ if [[ "$flags" == "no_proclinks" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op $flags
[/root/]testlink/"
+ else
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op
$flags [/root/]testlink/"
+ fi
+
+ vfs_helper -o "$op" -F "$flags" "/proc/$$/cwd/"
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op $flags
/proc/$$/cwd/"
+
+ vfs_helper -o "$op" -F "$flags" "/proc/$$/cwd/$BASH_SOURCE"
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op $flags
/proc/$$/cwd/$BASH_SOURCE"
+
+ vfs_helper -o "$op" -F "$flags" -d "/proc/self" cwd
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op $flags
[/proc/self/]cwd"
+ else
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op
$flags [/proc/self]/cwd"
+ fi
+ done
+done
diff --git a/tools/testing/selftests/vfs/tests/0004_at_no_symlinks.sh
b/tools/testing/selftests/vfs/tests/0004_at_no_symlinks.sh
new file mode 100755
index 000000000000..f7ec7e37f06a
--- /dev/null
+++ b/tools/testing/selftests/vfs/tests/0004_at_no_symlinks.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+sourcedir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+source "$sourcedir/../common.sh"
+
+mkdir -p "$root/dir"
+touch "$root/foo"
+
+ln -s . "$root/link_dot"
+ln -s .. "$root/link_dotdot"
+ln -s foo "$root/link_foo"
+
+for op in "${vfs_ops[@]}"
+do
+ vfs_helper -o "$op" -F no_symlinks -d "$root" foo
+ [[ "$status" = 0 ]] || fail "$op no_symlinks [/root/]foo"
+
+ vfs_helper -o "$op" -F no_symlinks -d "$root" ../root/foo
+ [[ "$status" = 0 ]] || fail "$op no_symlinks [/root/]../root/foo"
+
+ vfs_helper -o "$op" -F no_symlinks -d "$root" link_foo
+ if [[ "$op" == "lstat" ]]
+ then
+ [[ "$status" = 0 ]] || fail "$op no_symlinks
[/root/]link_foo(=foo)"
+ else
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op
no_symlinks [/root/]link_foo(=foo)"
+ fi
+
+ vfs_helper -o "$op" -F no_proclinks -d "$root" link_foo
+ [[ "$status" = 0 ]] || fail "$op no_proclinks [/root/]link_foo(=foo)"
+
+ vfs_helper -o "$op" -F no_symlinks -d "$root" link_dotdot/
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op no_symlinks
[/root/]link_dotdot(=..)/"
+
+ vfs_helper -o "$op" -F no_proclinks -d "$root" link_dotdot/
+ [[ "$status" = 0 ]] || fail "$op no_proclinks [/root/]link_dotdot(=..)/"
+
+ vfs_helper -o "$op" -F no_symlinks -d "$root" link_dot/dir
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op no_symlinks
[/root/]link_dot(=.)/dir"
+
+ vfs_helper -o "$op" -F no_proclinks -d "$root" link_dot/dir
+ [[ "$status" = 0 ]] || fail "$op no_proclinks [/root/]link_dot(=.)/dir"
+
+ vfs_helper -o "$op" -F no_symlinks -d "$root"
../root/link_dot/link_dotdot/root/dir
+ [[ "$(errno "$status")" =~ "ELOOP "* ]] || fail "$op no_symlinks
[/root/]../root/link_dot(=.)/link_dotdot(=..)/root/dir"
+done
diff --git a/tools/testing/selftests/vfs/tests/0005_at_this_root.sh
b/tools/testing/selftests/vfs/tests/0005_at_this_root.sh
new file mode 100755
index 000000000000..aba23c28a7b7
--- /dev/null
+++ b/tools/testing/selftests/vfs/tests/0005_at_this_root.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Author: Aleksa Sarai <cyp...@cyphar.com>
+# Copyright (C) 2018 SUSE LLC.
+
+sourcedir="$(readlink -f "$(dirname "$BASH_SOURCE")")"
+source "$sourcedir/../common.sh"
+
+mkdir -p "$root/var" "$root/etc" "$root/usr/bin" "$root/usr/local/bin"
+ln -s bash "$root/usr/bin/sh"
+ln -s ../../bin/bash "$root/usr/local/bin/bash"
+ln -s /bin/sh "$root/usr/local/bin/sh"
+ln -s ../bin3 "$root/var/bin"
+ln -s /usr/bin "$root/bin"
+ln -s /usr/local/bin "$root/bin4"
+ln -s ../../../../../../../../../bin "$root/bin2"
+ln -s /../../../../../../../../../bin "$root/bin3"
+touch "$root/etc/passwd" "$root/usr/bin/bash"
+
+# How should each path be mapped to a host path, in the form
+# 'path:hostpath[:hostpath_trailing]'. Everything is assumed to be ${root}
+# prefixed.
+host_mappings=(
+ # Basic paths.
+ "..:."
+ "/:."
+ "/../../../../../../:."
+ "../var/../../../../../etc/passwd:etc/passwd"
+ "/var/../../../../../etc/passwd:etc/passwd"
+ "/../../../../../../var/../../../../../etc/passwd:etc/passwd"
+ "etc/passwd:etc/passwd"
+ "/etc/passwd:etc/passwd"
+
+ # Basic symlink paths.
+ "/bin/bash:usr/bin/bash"
+ "/bin/sh:usr/bin/bash:usr/bin/sh"
+ "/bin2/bash:usr/bin/bash"
+ "/bin2/sh:usr/bin/bash:usr/bin/sh"
+ "/bin3/sh:usr/bin/bash:usr/bin/sh"
+ "/bin3/bash:usr/bin/bash"
+
+ # More complicated symlink paths.
+ "/bin4/../../local/bin/bash:usr/bin/bash:usr/local/bin/bash"
+ "/bin4/../../local/bin/sh:usr/bin/bash:usr/local/bin/sh"
+
"/bin4/../../../../../../../../../../usr/local/bin/bash:usr/bin/bash:usr/local/bin/bash"
+
"/bin4/../../../../../../../../../../usr/local/bin/sh:usr/bin/bash:usr/local/bin/sh"
+ "/bin/../../bin4/../../local/bin/bash:usr/bin/bash:usr/local/bin/bash"
+ "/bin/../../bin4/../../local/bin/sh:usr/bin/bash:usr/local/bin/sh"
+)
+
+for op in "${vfs_ops[@]}"
+do
+ for mapping in "${host_mappings[@]}"
+ do
+ IFS=":" read path hostpath hostpath_trailing <<< "$mapping"
+ [[ "$hostpath_trailing" ]] || export
hostpath_trailing="$hostpath"
+ [[ "$op" == "lstat" ]] && export hostpath="$hostpath_trailing"
+
+ # Compare with and without this_root...
+ vfs_helper -o "$op" -d "$root" "$hostpath"
+ old_status="$status" old_output="$output"
+ vfs_helper -o "$op" -F this_root -d "$root" "$path"
+ [[ "$status" = "$old_status" ]] || fail "$op this_root
$path=$status neq $old_status"
+ [[ "$output" == "$old_output" ]] || fail "$op this_root
$path=$output neq $old_output"
+ done
+done
diff --git a/tools/testing/selftests/vfs/vfs_helper.c
b/tools/testing/selftests/vfs/vfs_helper.c
new file mode 100644
index 000000000000..d67ec74a3fca
--- /dev/null
+++ b/tools/testing/selftests/vfs/vfs_helper.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Aleksa Sarai <cyp...@cyphar.com>
+ * Copyright (C) 2018 SUSE LLC.
+ */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+
+#include "at_flags.h"
+#include "../kselftest.h"
+
+#define bail(...) \
+ do { \
+ fprintf(stderr, __VA_ARGS__); \
+ fputs("\n", stderr); \
+ exit(1); \
+ } while (0)
+
+extern char *__progname;
+#define usage()
\
+ bail("usage: %s -o {open|stat|lstat} [-d <dirfd-path>] " \
+ "[-F [<flag1>,...<flagN>] <path>", __progname)
+
+static unsigned int parse_at_flags(char *opts)
+{
+ char *opt, *saveptr = NULL;
+ unsigned int flags = 0;
+
+ opt = strtok_r(opts, ",", &saveptr);
+ do {
+ unsigned int found = 0;
+
+ if (!*opt)
+ continue;
+ for (struct flag *flag = AT_FLAGS; flag->name != NULL; flag++) {
+ if (!strcmp(opt, flag->name))
+ found |= flag->at_flag;
+ }
+ if (!found)
+ bail("unknown openat(2) flag: %s", opt);
+ flags |= found;
+ } while ((opt = strtok_r(NULL, ",", &saveptr)) != NULL);
+
+ return flags;
+}
+
+int stat_wrapper(int dirfd, const char *pathname, unsigned int flags)
+{
+ struct stat st = {0};
+ int err;
+
+ err = fstatat(dirfd, pathname, &st, flags);
+ if (err < 0)
+ return err;
+
+ printf("%lu:%lu\n", st.st_dev, st.st_ino);
+ return 0;
+}
+
+int lstat_wrapper(int dirfd, const char *pathname, unsigned int flags)
+{
+ return stat_wrapper(dirfd, pathname, flags | AT_SYMLINK_NOFOLLOW);
+}
+
+int openat_wrapper(int dirfd, const char *pathname, unsigned int flags)
+{
+ int fd;
+ char *fdpath = NULL, fullpath[PATH_MAX] = {0};
+
+ fd = openat(dirfd, pathname, flags);
+ if (fd < 0)
+ return fd;
+
+ /* Print the fully-qualified path using /proc/pid/fd/... */
+ if (asprintf(&fdpath, "/proc/self/fd/%d", fd) < 0)
+ bail("asprintf /proc/self/fd/%d: %m", fd);
+ if (readlink(fdpath, fullpath, PATH_MAX) < 0)
+ bail("readlink %s: %m", fdpath);
+ puts(fullpath);
+ return fd;
+}
+
+int main(int argc, char **argv)
+{
+ int opt, ret, dirfd;
+ unsigned int flags = 0;
+ char *opstr = NULL, *dir_path = NULL, *path = NULL;
+ int (*opfunc)(int dirfd, const char *pathname, unsigned int flags);
+
+ while ((opt = getopt(argc, argv, "o:d:F:")) != -1) {
+ switch (opt) {
+ case 'o':
+ opstr = optarg;
+ break;
+ case 'd':
+ dir_path = optarg;
+ break;
+ case 'F':
+ flags |= parse_at_flags(optarg);
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc != 1)
+ usage();
+ path = argv[0];
+
+ if (!opstr)
+ usage();
+ else if (!strcmp(opstr, "stat"))
+ opfunc = stat_wrapper;
+ else if (!strcmp(opstr, "lstat"))
+ opfunc = lstat_wrapper;
+ else if (!strcmp(opstr, "open"))
+ opfunc = openat_wrapper;
+ else
+ usage();
+
+ if (opfunc == openat_wrapper) {
+ unsigned int open_flags = 0;
+
+ for (struct flag *flag = AT_FLAGS; flag->name != NULL; flag++) {
+ if (flags & flag->at_flag)
+ open_flags |= flag->open_flag;
+ }
+ flags = open_flags;
+ }
+
+ dirfd = AT_FDCWD;
+ if (dir_path) {
+ dirfd = open(dir_path, O_PATH|O_DIRECTORY);
+ if (dirfd < 0)
+ bail("cannot open dir_path: %m");
+ }
+
+ ret = opfunc(dirfd, path, flags);
+ if (ret < 0)
+ ret = -errno;
+ return (ret < 0) ? -ret : 0;
+}
--
2.19.0
