util/mkhtemp: add -q option (silence errors)

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/libreboot-utils/include/common.h

@@ -499,6 +499,8 @@ void b0rk(int nvm_errval, const char *msg, ...);
 int exit_cleanup(void);
 const char *getnvmprogname(void);
 
+void err_mkhtemp(int stfu, int errval, const char *msg, ...);
+
 /* libc hardening
  */
 

util/libreboot-utils/mkhtemp.c

@@ -10,6 +10,10 @@
  * generally provides much higher strictness than previous
  * implementations such as mktemp, mkstemp or even mkdtemp.
  *
+ * It uses several modern features by default, e.g. openat2
+ * and O_TMPFILE on Linux, with additional hardening; BSD
+ * projects only have openat so the code uses that there.
+ *
  * Many programs rely on mktemp, and they use TMPDIR in a way
  * that is quite insecure. Mkhtemp intends to change that,
  * quite dramatically, with: userspace sandbox (and use OS
@@ -87,20 +91,13 @@ main(int argc, char *argv[])
 
 	int fd = -1;
 	int type = MKHTEMP_FILE;
+	int stfu = 0; /* -q option */
 
 	if (lbgetprogname(argv[0]) == NULL)
-		err_no_cleanup(errno, "could not set progname");
+		err_mkhtemp(0, errno, "could not set progname");
-
-/* https://man.openbsd.org/pledge.2 */
-#if defined(__OpenBSD__) && defined(OpenBSD)
-#if (OpenBSD) >= 509
-	if (pledge("stdio flock rpath wpath cpath", NULL) == -1)
-		goto err_usage;
-#endif
-#endif
 
 	while ((c =
-	    getopt(argc, argv, "dp:")) != -1) {
+	    getopt(argc, argv, "qdp:")) != -1) {
 
 		switch (c) {
 		case 'd':
@@ -111,28 +108,40 @@ main(int argc, char *argv[])
 			tmpdir = optarg;
 			break;
 
+		case 'q': /* don't print errors */
+			  /* (exit status unchanged) */
+			stfu = 1;
+			break;
+
 		default:
 			goto err_usage;
 		}
 	}
 
+/* https://man.openbsd.org/pledge.2 */
+#if defined(__OpenBSD__) && defined(OpenBSD)
+#if (OpenBSD) >= 509
+	if (pledge("stdio flock rpath wpath cpath", NULL) == -1)
+		goto err_usage;
+#endif
+#endif
+
 	if (optind < argc)
 		template = argv[optind];
 	if (optind + 1 < argc)
-		err_no_cleanup(EINVAL,
+		goto err_usage;
-		    "usage: mkhtemp [-d] [-p dir] [template]\n");
 
 	/* custom template e.g. foo.XXXXXXXXXXXXXXXXXXXXX */
 	if (template != NULL) {	
 		if (slen(template, maxlen, &tlen) < 0)
-			err_no_cleanup(EINVAL,
+			err_mkhtemp(stfu, EINVAL,
 			    "invalid template");
 
 		for (p = template + tlen;
 		    p > template && *--p == 'X'; xc++);
 
 		if (xc < 6)
-			err_no_cleanup(EINVAL,
+			err_mkhtemp(stfu, EINVAL,
 			    "template must end in at least 6 X");
 	}
 
@@ -146,38 +155,35 @@ main(int argc, char *argv[])
 	if (tmpdir != NULL) {
 		rp = realpath(tmpdir, resolved);
 		if (rp == NULL)
-			err_no_cleanup(errno,
+			err_mkhtemp(stfu, errno, "%s", tmpdir);
-			    "%s", tmpdir);
 
 		tmpdir = resolved;
 	}
 
 	if (new_tmp_common(&fd, &s, type,
 	    tmpdir, template) < 0)
-		err_no_cleanup(errno, "%s", s);
+		err_mkhtemp(stfu, errno, "%s", s);
 
 #if defined(__OpenBSD__) && defined(OpenBSD)
 #if (OpenBSD) >= 509
 	if (pledge("stdio", NULL) == -1)
-		err_no_cleanup(errno, "pledge, exit");
+		err_mkhtemp(errno, "pledge, exit");
 #endif
 #endif
 
 	if (s == NULL)
-		err_no_cleanup(EFAULT, "bad string initialisation");
+		err_mkhtemp(stfu, EFAULT, "bad string initialisation");
-
 	if (*s == '\0')
-		err_no_cleanup(EFAULT, "empty string initialisation");
+		err_mkhtemp(stfu, EFAULT, "empty string initialisation");
-
 	if (slen(s, maxlen, &len) < 0)
-		err_no_cleanup(EFAULT, "unterminated string initialisation");
+		err_mkhtemp(stfu, EFAULT, "unterminated string initialisiert");
 
 	printf("%s\n", s);
 
 	return EXIT_SUCCESS;
 
 err_usage:
-	err_no_cleanup(EINVAL,
+	err_mkhtemp(stfu, EINVAL,
 	    "usage: %s [-d] [-p dir] [template]\n", getnvmprogname());
 }/* 
 
@@ -191,3 +197,33 @@ err_usage:
 
 
                                                                              */
+
+void
+err_mkhtemp(int stfu,
+    int errval, const char *msg, ...)
+{
+	va_list args;
+
+	if (stfu || msg == NULL)
+		goto out;
+
+	va_start(args, msg);
+	vfprintf(stderr, msg, args);
+	va_end(args);
+
+	err_no_cleanup(errval, msg, args);
+out:
+	exit(EXIT_FAILURE);
+}
+
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+