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-rw-r--r--src/libsystemd/sd-bus/bus-gvariant.c21
-rw-r--r--src/libsystemd/sd-bus/bus-message.c26
-rw-r--r--src/libsystemd/sd-bus/test-bus-gvariant.c2
3 files changed, 38 insertions, 11 deletions
diff --git a/src/libsystemd/sd-bus/bus-gvariant.c b/src/libsystemd/sd-bus/bus-gvariant.c
index 2d18a4e6c1..402d43d66d 100644
--- a/src/libsystemd/sd-bus/bus-gvariant.c
+++ b/src/libsystemd/sd-bus/bus-gvariant.c
@@ -75,14 +75,19 @@ int bus_gvariant_get_size(const char *signature) {
case SD_BUS_TYPE_STRUCT_BEGIN:
case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
- char t[n-1];
-
- memcpy(t, p + 1, n - 2);
- t[n - 2] = 0;
-
- r = bus_gvariant_get_size(t);
- if (r < 0)
- return r;
+ if (n == 2) {
+ /* unary type () has fixed size of 1 */
+ r = 1;
+ } else {
+ char t[n-1];
+
+ memcpy(t, p + 1, n - 2);
+ t[n - 2] = 0;
+
+ r = bus_gvariant_get_size(t);
+ if (r < 0)
+ return r;
+ }
sum += r;
break;
diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
index c8806d516a..c37a44493a 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -2209,7 +2209,14 @@ static int bus_message_close_struct(sd_bus_message *m, struct bus_container *c,
assert(!c->need_offsets || i == c->n_offsets);
assert(c->need_offsets || n_variable == 0);
- if (n_variable <= 0) {
+ if (isempty(c->signature)) {
+ /* The unary type is encoded as fixed 1 byte padding */
+ a = message_extend_body(m, 1, 1, add_offset, false);
+ if (!a)
+ return -ENOMEM;
+
+ *a = 0;
+ } else if (n_variable <= 0) {
int alignment = 1;
/* Structures with fixed-size members only have to be
@@ -3814,6 +3821,14 @@ static int build_struct_offsets(
assert(n_offsets);
if (isempty(signature)) {
+ /* Unary type is encoded as *fixed* 1 byte padding */
+ r = message_peek_body(m, &m->rindex, 1, 1, &q);
+ if (r < 0)
+ return r;
+
+ if (*(uint8_t *) q != 0)
+ return -EBADMSG;
+
*item_size = 0;
*offsets = NULL;
*n_offsets = 0;
@@ -4140,7 +4155,14 @@ _public_ int sd_bus_message_enter_container(sd_bus_message *m,
w->before = before;
w->begin = m->rindex;
- w->end = m->rindex + c->item_size;
+
+ /* Unary type has fixed size of 1, but virtual size of 0 */
+ if (BUS_MESSAGE_IS_GVARIANT(m) &&
+ type == SD_BUS_TYPE_STRUCT &&
+ isempty(signature))
+ w->end = m->rindex + 0;
+ else
+ w->end = m->rindex + c->item_size;
w->array_size = array_size;
w->item_size = item_size;
diff --git a/src/libsystemd/sd-bus/test-bus-gvariant.c b/src/libsystemd/sd-bus/test-bus-gvariant.c
index 9b7dd2e499..b078bdc5f6 100644
--- a/src/libsystemd/sd-bus/test-bus-gvariant.c
+++ b/src/libsystemd/sd-bus/test-bus-gvariant.c
@@ -59,7 +59,7 @@ static void test_bus_gvariant_is_fixed_size(void) {
static void test_bus_gvariant_get_size(void) {
assert_se(bus_gvariant_get_size("") == 0);
- assert_se(bus_gvariant_get_size("()") == 0);
+ assert_se(bus_gvariant_get_size("()") == 1);
assert_se(bus_gvariant_get_size("y") == 1);
assert_se(bus_gvariant_get_size("u") == 4);
assert_se(bus_gvariant_get_size("b") == 1);