1 files changed, 108 insertions, 0 deletions
diff --git a/lib/util/strtoid.c b/lib/util/strtoid.c
new file mode 100644
index 0000000..fe5b44d
--- /dev/null
+++ b/lib/util/strtoid.c
@@ -0,0 +1,108 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2020 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 <sys/types.h>			/* for id_t */
+
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_gettext.h"
+#include "sudo_util.h"
+
+/*
+ * Make sure that the ID ends with a valid separator char.
+ */
+static bool
+valid_separator(const char *p, const char *ep, const char *sep)
+{
+    bool valid = false;
+
+    if (ep != p) {
+	/* check for valid separator (including '\0') */
+	if (sep == NULL)
+	    sep = "";
+	do {
+	    if (*ep == *sep)
+		valid = true;
+	} while (*sep++ != '\0');
+    }
+    return valid;
+}
+
+/*
+ * Parse a uid/gid in string form.
+ * If sep is non-NULL, it contains valid separator characters (e.g. comma, space)
+ * If endp is non-NULL it is set to the next char after the ID.
+ * On success, returns the parsed ID and clears errstr.
+ * On error, returns 0 and sets errstr.
+ */
+id_t
+sudo_strtoidx_v1(const char *p, const char *sep, char **endp, const char **errstrp)
+{
+    const char *errstr;
+    char *ep;
+    id_t ret;
+    debug_decl(sudo_strtoid, SUDO_DEBUG_UTIL);
+
+    ret = sudo_strtonumx(p, INT_MIN, UINT_MAX, &ep, &errstr);
+    if (errstr == NULL) {
+	/*
+	 * Disallow id -1 (UINT_MAX), which means "no change"
+	 * and check for a valid separator (if specified).
+	 */
+	if (ret == (id_t)-1 || ret == (id_t)UINT_MAX || !valid_separator(p, ep, sep)) {
+	    errstr = N_("invalid value");
+	    errno = EINVAL;
+	    ret = 0;
+	}
+    }
+    if (errstrp != NULL)
+	*errstrp = errstr;
+    if (endp != NULL)
+	*endp = ep;
+    debug_return_id_t(ret);
+}
+
+/* Backward compatibility */
+id_t
+sudo_strtoid_v1(const char *p, const char *sep, char **endp, const char **errstrp)
+{
+    return sudo_strtoidx_v1(p, sep, endp, errstrp);
+}
+
+/* Simplified interface */
+id_t
+sudo_strtoid_v2(const char *p, const char **errstrp)
+{
+    return sudo_strtoidx_v1(p, NULL, NULL, errstrp);
+}