1 files changed, 100 insertions, 0 deletions
diff --git a/lib/util/progname.c b/lib/util/progname.c
new file mode 100644
index 0000000..a5f93b2
--- /dev/null
+++ b/lib/util/progname.c
@@ -0,0 +1,100 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2015, 2020-2021 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+
+/*
+ * Declare/define __progname[] if necessary.
+ * Assumes __progname[] is present if we have getprogname(3).
+ */
+#ifndef HAVE_SETPROGNAME
+# if defined(HAVE_GETPROGNAME) || defined(HAVE___PROGNAME)
+extern const char *__progname;
+# else
+static const char *__progname = "";
+# endif /* HAVE_GETPROGNAME || HAVE___PROGNAME */
+#endif /* HAVE_SETPROGNAME */
+
+#ifndef HAVE_GETPROGNAME
+const char *
+sudo_getprogname(void)
+{
+    return __progname;
+}
+#endif
+
+#ifndef HAVE_SETPROGNAME
+void
+sudo_setprogname(const char *name)
+{
+    __progname = sudo_basename(name);
+}
+#endif
+
+void
+initprogname2(const char *name, const char * const * allowed)
+{
+    const char *progname;
+    int i;
+
+    /* Fall back on "name" if getprogname() returns an empty string. */
+    if ((progname = getprogname()) != NULL && *progname != '\0') {
+	name = progname;
+    } else {
+	/* Make sure user-specified name is relative. */
+	name = sudo_basename(name);
+    }
+
+    /* Check for libtool prefix and strip it if present. */
+    if (name[0] == 'l' && name[1] == 't' && name[2] == '-' && name[3] != '\0')
+	name += 3;
+
+    /* Check allow list if present (first element is the default). */
+    if (allowed != NULL) {
+	for (i = 0; ; i++) {
+	    if (allowed[i] == NULL) {
+		name = allowed[0];
+		break;
+	    }
+	    if (strcmp(allowed[i], name) == 0)
+		break;
+	}
+    }
+
+    /* Update internal progname if needed. */
+    if (name != progname)
+	setprogname(name);
+    return;
+}
+
+void
+initprogname(const char *name)
+{
+    initprogname2(name, NULL);
+}