From b750101eb236130cf056c675997decbac904cc49 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 17:35:18 +0200
Subject: Adding upstream version 252.22.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/basic/tmpfile-util.c | 360 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 360 insertions(+)
 create mode 100644 src/basic/tmpfile-util.c

(limited to 'src/basic/tmpfile-util.c')

diff --git a/src/basic/tmpfile-util.c b/src/basic/tmpfile-util.c
new file mode 100644
index 0000000..34d3016
--- /dev/null
+++ b/src/basic/tmpfile-util.c
@@ -0,0 +1,360 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/mman.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hexdecoct.h"
+#include "macro.h"
+#include "memfd-util.h"
+#include "missing_fcntl.h"
+#include "missing_syscall.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "random-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "tmpfile-util.h"
+#include "umask-util.h"
+
+int fopen_temporary(const char *path, FILE **ret_f, char **ret_temp_path) {
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_free_ char *t = NULL;
+        _cleanup_close_ int fd = -1;
+        int r;
+
+        if (path) {
+                r = tempfn_xxxxxx(path, NULL, &t);
+                if (r < 0)
+                        return r;
+        } else {
+                const char *d;
+
+                r = tmp_dir(&d);
+                if (r < 0)
+                        return r;
+
+                t = path_join(d, "XXXXXX");
+                if (!t)
+                        return -ENOMEM;
+        }
+
+        fd = mkostemp_safe(t);
+        if (fd < 0)
+                return -errno;
+
+        /* This assumes that returned FILE object is short-lived and used within the same single-threaded
+         * context and never shared externally, hence locking is not necessary. */
+
+        r = take_fdopen_unlocked(&fd, "w", &f);
+        if (r < 0) {
+                (void) unlink(t);
+                return r;
+        }
+
+        if (ret_f)
+                *ret_f = TAKE_PTR(f);
+
+        if (ret_temp_path)
+                *ret_temp_path = TAKE_PTR(t);
+
+        return 0;
+}
+
+/* This is much like mkostemp() but is subject to umask(). */
+int mkostemp_safe(char *pattern) {
+        assert(pattern);
+        BLOCK_WITH_UMASK(0077);
+        return RET_NERRNO(mkostemp(pattern, O_CLOEXEC));
+}
+
+int fmkostemp_safe(char *pattern, const char *mode, FILE **ret_f) {
+        _cleanup_close_ int fd = -1;
+        FILE *f;
+
+        fd = mkostemp_safe(pattern);
+        if (fd < 0)
+                return fd;
+
+        f = take_fdopen(&fd, mode);
+        if (!f)
+                return -errno;
+
+        *ret_f = f;
+        return 0;
+}
+
+static int tempfn_build(const char *p, const char *pre, const char *post, bool child, char **ret) {
+        _cleanup_free_ char *d = NULL, *fn = NULL, *nf = NULL, *result = NULL;
+        size_t len_pre, len_post, len_add;
+        int r;
+
+        assert(p);
+        assert(ret);
+
+        /*
+         * Turns this:
+         *         /foo/bar/waldo
+         *
+         * Into this :
+         *         /foo/bar/waldo/.#<pre><post> (child == true)
+         *         /foo/bar/.#<pre>waldo<post> (child == false)
+         */
+
+        if (pre && strchr(pre, '/'))
+                return -EINVAL;
+
+        if (post && strchr(post, '/'))
+                return -EINVAL;
+
+        len_pre = strlen_ptr(pre);
+        len_post = strlen_ptr(post);
+        /* NAME_MAX is counted *without* the trailing NUL byte. */
+        if (len_pre > NAME_MAX - STRLEN(".#") ||
+            len_post > NAME_MAX - STRLEN(".#") - len_pre)
+                return -EINVAL;
+
+        len_add = len_pre + len_post + STRLEN(".#");
+
+        if (child) {
+                d = strdup(p);
+                if (!d)
+                        return -ENOMEM;
+        } else {
+                r = path_extract_directory(p, &d);
+                if (r < 0 && r != -EDESTADDRREQ) /* EDESTADDRREQ → No directory specified, just a filename */
+                        return r;
+
+                r = path_extract_filename(p, &fn);
+                if (r < 0)
+                        return r;
+
+                if (strlen(fn) > NAME_MAX - len_add)
+                        /* We cannot simply prepend and append strings to the filename. Let's truncate the filename. */
+                        fn[NAME_MAX - len_add] = '\0';
+        }
+
+        nf = strjoin(".#", strempty(pre), strempty(fn), strempty(post));
+        if (!nf)
+                return -ENOMEM;
+
+        if (d) {
+                if (!path_extend(&d, nf))
+                        return -ENOMEM;
+
+                result = path_simplify(TAKE_PTR(d));
+        } else
+                result = TAKE_PTR(nf);
+
+        if (!path_is_valid(result)) /* New path is not valid? (Maybe because too long?) Refuse. */
+                return -EINVAL;
+
+        *ret = TAKE_PTR(result);
+        return 0;
+}
+
+int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
+        /*
+         * Turns this:
+         *         /foo/bar/waldo
+         *
+         * Into this:
+         *         /foo/bar/.#<extra>waldoXXXXXX
+         */
+
+        return tempfn_build(p, extra, "XXXXXX", /* child = */ false, ret);
+}
+
+int tempfn_random(const char *p, const char *extra, char **ret) {
+        _cleanup_free_ char *s = NULL;
+
+        assert(p);
+        assert(ret);
+
+        /*
+         * Turns this:
+         *         /foo/bar/waldo
+         *
+         * Into this:
+         *         /foo/bar/.#<extra>waldobaa2a261115984a9
+         */
+
+        if (asprintf(&s, "%016" PRIx64, random_u64()) < 0)
+                return -ENOMEM;
+
+        return tempfn_build(p, extra, s, /* child = */ false, ret);
+}
+
+int tempfn_random_child(const char *p, const char *extra, char **ret) {
+        _cleanup_free_ char *s = NULL;
+        int r;
+
+        assert(ret);
+
+        /* Turns this:
+         *         /foo/bar/waldo
+         * Into this:
+         *         /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
+         */
+
+        if (!p) {
+                r = tmp_dir(&p);
+                if (r < 0)
+                        return r;
+        }
+
+        if (asprintf(&s, "%016" PRIx64, random_u64()) < 0)
+                return -ENOMEM;
+
+        return tempfn_build(p, extra, s, /* child = */ true, ret);
+}
+
+int open_tmpfile_unlinkable(const char *directory, int flags) {
+        char *p;
+        int fd, r;
+
+        if (!directory) {
+                r = tmp_dir(&directory);
+                if (r < 0)
+                        return r;
+        } else if (isempty(directory))
+                return -EINVAL;
+
+        /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
+
+        /* Try O_TMPFILE first, if it is supported */
+        fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
+        if (fd >= 0)
+                return fd;
+
+        /* Fall back to unguessable name + unlinking */
+        p = strjoina(directory, "/systemd-tmp-XXXXXX");
+
+        fd = mkostemp_safe(p);
+        if (fd < 0)
+                return fd;
+
+        (void) unlink(p);
+
+        return fd;
+}
+
+int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
+        _cleanup_free_ char *tmp = NULL;
+        int r, fd;
+
+        assert(target);
+        assert(ret_path);
+
+        /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
+        assert((flags & O_EXCL) == 0);
+
+        /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
+         * which case "ret_path" will be returned as NULL. If not possible the temporary path name used is returned in
+         * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
+
+        fd = open_parent(target, O_TMPFILE|flags, 0640);
+        if (fd >= 0) {
+                *ret_path = NULL;
+                return fd;
+        }
+
+        log_debug_errno(fd, "Failed to use O_TMPFILE for %s: %m", target);
+
+        r = tempfn_random(target, NULL, &tmp);
+        if (r < 0)
+                return r;
+
+        fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
+        if (fd < 0)
+                return -errno;
+
+        *ret_path = TAKE_PTR(tmp);
+
+        return fd;
+}
+
+int fopen_tmpfile_linkable(const char *target, int flags, char **ret_path, FILE **ret_file) {
+        _cleanup_free_ char *path = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_close_ int fd = -1;
+
+        assert(target);
+        assert(ret_file);
+        assert(ret_path);
+
+        fd = open_tmpfile_linkable(target, flags, &path);
+        if (fd < 0)
+                return fd;
+
+        f = take_fdopen(&fd, "w");
+        if (!f)
+                return -ENOMEM;
+
+        *ret_path = TAKE_PTR(path);
+        *ret_file = TAKE_PTR(f);
+        return 0;
+}
+
+int link_tmpfile(int fd, const char *path, const char *target) {
+        assert(fd >= 0);
+        assert(target);
+
+        /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
+         * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
+         * on the directory, and renameat2() is used instead.
+         *
+         * Note that in both cases we will not replace existing files. This is because linkat() does not support this
+         * operation currently (renameat2() does), and there is no nice way to emulate this. */
+
+        if (path)
+                return rename_noreplace(AT_FDCWD, path, AT_FDCWD, target);
+
+        return RET_NERRNO(linkat(AT_FDCWD, FORMAT_PROC_FD_PATH(fd), AT_FDCWD, target, AT_SYMLINK_FOLLOW));
+}
+
+int flink_tmpfile(FILE *f, const char *path, const char *target) {
+        int fd, r;
+
+        assert(f);
+        assert(target);
+
+        fd = fileno(f);
+        if (fd < 0) /* Not all FILE* objects encapsulate fds */
+                return -EBADF;
+
+        r = fflush_sync_and_check(f);
+        if (r < 0)
+                return r;
+
+        return link_tmpfile(fd, path, target);
+}
+
+int mkdtemp_malloc(const char *template, char **ret) {
+        _cleanup_free_ char *p = NULL;
+        int r;
+
+        assert(ret);
+
+        if (template)
+                p = strdup(template);
+        else {
+                const char *tmp;
+
+                r = tmp_dir(&tmp);
+                if (r < 0)
+                        return r;
+
+                p = path_join(tmp, "XXXXXX");
+        }
+        if (!p)
+                return -ENOMEM;
+
+        if (!mkdtemp(p))
+                return -errno;
+
+        *ret = TAKE_PTR(p);
+        return 0;
+}
-- 
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