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https://codeberg.org/libreboot/lbmk.git
synced 2026-07-11 14:02:52 +02:00
Leah Rowe
2c40ad7816
and remove manual prototypes; fchmod, realpath and so on rely on the _XOPEN_SOURCE macro. the POSIX macro wasn't needed: _XOPEN_SOURCE is sufficient. Signed-off-by: Leah Rowe <leah@libreboot.org>
144 lines
2.9 KiB
C
144 lines
2.9 KiB
C
/* SPDX-License-Identifier: MIT ( >:3 )
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* Copyright (c) 2026 Leah Rowe <leah@libreboot.org> /| |\
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* / \
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* Hardened mktemp (mkhtemp!)
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*
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* WORK IN PROGRESS (proof of concept), or, v0.0000001
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* DO NOT PUT THIS IN YOUR LINUX DISTRO YET.
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*
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* In other words: for reference only -- PATCHES WELCOME!
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*
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* I will remove this notice when the code is mature, and
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* probably contact several of your projects myself.
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*
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* See README. This is an ongoing project; no proper docs
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* yet, and no manpage (yet!) - the code is documentation,
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* while the specification that it implements evolves.
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*/
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#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE 700
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "include/common.h"
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static void
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exit_cleanup(void);
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int
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main(int argc, char *argv[])
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{
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size_t len;
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size_t tlen;
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size_t xc = 0;
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char *tmpdir = NULL;
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char *template = NULL;
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char *p;
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char *s = NULL;
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char *rp;
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char resolved[PATH_MAX];
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char c;
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int fd = -1;
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int type = MKHTEMP_FILE;
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(void) errhook(exit_cleanup);
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(void) lbsetprogname(argv[0]);
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/* https://man.openbsd.org/pledge.2 */
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xpledgex("stdio flock rpath wpath cpath", NULL);
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while ((c =
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getopt(argc, argv, "qdp:")) != -1) {
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switch (c) {
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case 'd':
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type = MKHTEMP_DIR;
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break;
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case 'p':
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tmpdir = optarg;
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break;
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case 'q': /* don't print errors */
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/* (exit status unchanged) */
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break;
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default:
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goto err_usage;
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}
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}
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if (optind < argc)
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template = argv[optind];
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if (optind + 1 < argc)
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goto err_usage;
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/* custom template e.g. foo.XXXXXXXXXXXXXXXXXXXXX */
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if (template != NULL) {
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for (p = template + slen(template, PATH_MAX, &tlen);
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p > template && *--p == 'X'; xc++);
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if (xc < 3) /* the gnu mktemp errs on less than 3 */
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exitf(
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"template must have 3 X or more on end (12+ advised");
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}
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/* user supplied -p PATH - WARNING:
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* this permits symlinks, but only here,
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* not in the library, so they are resolved
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* here first, and *only here*. the mkhtemp
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* library blocks them. be careful
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* when using -p
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*/
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if (tmpdir != NULL) {
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rp = realpath(tmpdir, resolved);
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if (rp == NULL)
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exitf("%s", tmpdir);
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tmpdir = resolved;
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}
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if (new_tmp_common(&fd, &s, type,
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tmpdir, template) < 0)
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exitf("%s", s);
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xpledgex("stdio", NULL);
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if (s == NULL)
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exitf("bad string initialisation");
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if (*s == '\0')
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exitf("empty string initialisation");
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slen(s, PATH_MAX, &len); /* Nullterminierung prüfen */
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/* for good measure. (bonus: also re-checks length overflow) */
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printf("%s\n", s);
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return EXIT_SUCCESS;
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err_usage:
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exitf(
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"usage: %s [-d] [-p dir] [template]\n", lbgetprogname());
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}
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static void
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exit_cleanup(void)
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{
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return;
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}
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