1 files changed, 122 insertions, 0 deletions
diff --git a/src/regress/ttyname/check_ttyname.c b/src/regress/ttyname/check_ttyname.c
new file mode 100644
index 0000000..715423d
--- /dev/null
+++ b/src/regress/ttyname/check_ttyname.c
@@ -0,0 +1,122 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2020, 2022 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif /* HAVE_STDBOOL_H */
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+
+#include <sudo_compat.h>
+#include <sudo_fatal.h>
+#include <sudo_util.h>
+#include <sudo_debug.h>
+
+sudo_dso_public int main(int argc, char *argv[]);
+
+int sudo_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
+extern char *get_process_ttyname(char *name, size_t namelen);
+
+static int
+match_ttys(const char *tty1, const char *tty2)
+{
+    struct stat sb1, sb2;
+
+    if (tty1 != NULL && tty2 != NULL) {
+	if (strcmp(tty1, tty2) == 0)
+	    return 0;
+	/* Could be the same device with a different name. */
+	if (stat(tty1, &sb1) == 0 && S_ISCHR(sb1.st_mode) &&
+	    stat(tty2, &sb2) == 0 && S_ISCHR(sb2.st_mode)) {
+	    if (sb1.st_rdev == sb2.st_rdev)
+		return 0;
+	}
+    } else if (tty1 == NULL && tty2 == NULL) {
+	return 0;
+    }
+
+    return 1;
+}
+
+int
+main(int argc, char *argv[])
+{
+    char *tty_libc = NULL, *tty_sudo = NULL;
+    char pathbuf[PATH_MAX];
+    bool verbose = false;
+    int ch, errors = 0, ntests = 1;
+
+    initprogname(argc > 0 ? argv[0] : "check_ttyname");
+
+    while ((ch = getopt(argc, argv, "v")) != -1) {
+	switch (ch) {
+	case 'v':
+	    verbose = true;
+	    break;
+	default:
+	    fprintf(stderr, "usage: %s [-v]\n", getprogname());
+	    return EXIT_FAILURE;
+	}
+    }
+
+    /* Lookup tty name using kernel info if possible. */
+    if (get_process_ttyname(pathbuf, sizeof(pathbuf)) != NULL)
+	tty_sudo = pathbuf;
+
+#if defined(HAVE_KINFO_PROC2_NETBSD) || \
+    defined(HAVE_KINFO_PROC_OPENBSD) || \
+    defined(HAVE_KINFO_PROC_FREEBSD) || \
+    defined(HAVE_KINFO_PROC_DFLY) || \
+    defined(HAVE_KINFO_PROC_44BSD) || \
+    defined(HAVE__TTYNAME_DEV) || defined(HAVE_STRUCT_PSINFO_PR_TTYDEV) || \
+    defined(HAVE_PSTAT_GETPROC) || defined(__linux__)
+
+    /* Lookup tty name attached to stdin via libc. */
+    tty_libc = ttyname(STDIN_FILENO);
+#endif
+
+    /* Compare libc and kernel ttys. */
+    if (match_ttys(tty_libc, tty_sudo) == 0) {
+	if (verbose)
+	    printf("%s: OK (%s)\n", getprogname(), tty_sudo ? tty_sudo : "none");
+    } else if (tty_libc == NULL) {
+	if (verbose)
+	    printf("%s: SKIP (%s)\n", getprogname(), tty_sudo ? tty_sudo : "none");
+	ntests = 0;
+    } else {
+	printf("%s: FAIL %s (sudo) vs. %s (libc)\n", getprogname(),
+	    tty_sudo ? tty_sudo : "none", tty_libc ? tty_libc : "none");
+	errors++;
+    }
+
+    if (ntests != 0) {
+	printf("%s: %d tests run, %d errors, %d%% success rate\n",
+	    getprogname(), ntests, errors, (ntests - errors) * 100 / ntests);
+    }
+    return errors;
+}