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-rw-r--r--src/libsystemd/sd-bus/bus-signature.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-signature.c b/src/libsystemd/sd-bus/bus-signature.c
new file mode 100644
index 0000000..78c7436
--- /dev/null
+++ b/src/libsystemd/sd-bus/bus-signature.c
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-bus.h"
+
+#include "bus-signature.h"
+#include "bus-type.h"
+
+static int signature_element_length_internal(
+ const char *s,
+ bool allow_dict_entry,
+ unsigned array_depth,
+ unsigned struct_depth,
+ size_t *l) {
+
+ int r;
+
+ if (!s)
+ return -EINVAL;
+
+ assert(l);
+
+ if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) {
+ *l = 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_ARRAY) {
+ size_t t;
+
+ if (array_depth >= 32)
+ return -EINVAL;
+
+ r = signature_element_length_internal(s + 1, true, array_depth+1, struct_depth, &t);
+ if (r < 0)
+ return r;
+
+ *l = t + 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_STRUCT_BEGIN) {
+ const char *p = s + 1;
+
+ if (struct_depth >= 32)
+ return -EINVAL;
+
+ while (*p != SD_BUS_TYPE_STRUCT_END) {
+ size_t t;
+
+ r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t);
+ if (r < 0)
+ return r;
+
+ p += t;
+ }
+
+ if (p - s < 2)
+ /* D-Bus spec: Empty structures are not allowed; there
+ * must be at least one type code between the parentheses.
+ */
+ return -EINVAL;
+
+ *l = p - s + 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_DICT_ENTRY_BEGIN && allow_dict_entry) {
+ const char *p = s + 1;
+ unsigned n = 0;
+
+ if (struct_depth >= 32)
+ return -EINVAL;
+
+ while (*p != SD_BUS_TYPE_DICT_ENTRY_END) {
+ size_t t;
+
+ if (n == 0 && !bus_type_is_basic(*p))
+ return -EINVAL;
+
+ r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t);
+ if (r < 0)
+ return r;
+
+ p += t;
+ n++;
+ }
+
+ if (n != 2)
+ return -EINVAL;
+
+ *l = p - s + 1;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+int signature_element_length(const char *s, size_t *l) {
+ return signature_element_length_internal(s, true, 0, 0, l);
+}
+
+bool signature_is_single(const char *s, bool allow_dict_entry) {
+ int r;
+ size_t t;
+
+ if (!s)
+ return false;
+
+ r = signature_element_length_internal(s, allow_dict_entry, 0, 0, &t);
+ if (r < 0)
+ return false;
+
+ return s[t] == 0;
+}
+
+bool signature_is_pair(const char *s) {
+
+ if (!s)
+ return false;
+
+ if (!bus_type_is_basic(*s))
+ return false;
+
+ return signature_is_single(s + 1, false);
+}
+
+bool signature_is_valid(const char *s, bool allow_dict_entry) {
+ const char *p;
+ int r;
+
+ if (!s)
+ return false;
+
+ p = s;
+ while (*p) {
+ size_t t;
+
+ r = signature_element_length_internal(p, allow_dict_entry, 0, 0, &t);
+ if (r < 0)
+ return false;
+
+ p += t;
+ }
+
+ return p - s <= SD_BUS_MAXIMUM_SIGNATURE_LENGTH;
+}