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-rw-r--r--lib/util/strtoid.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/util/strtoid.c b/lib/util/strtoid.c
new file mode 100644
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+++ 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);
+}