X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibelogind%2Fsd-bus%2Fbus-message.c;h=c37a44493aaf1fcaf10bc383d8d140a3969ee2a9;hp=18685be8ff53d13db7776ca5114760c21bdaf3ab;hb=133c3e1cd0fa015721410e0f06de6ed7f415d067;hpb=c075af2785a99062537699a87b5f83dd666144b7

diff --git a/src/libelogind/sd-bus/bus-message.c b/src/libelogind/sd-bus/bus-message.c
index 18685be8f..c37a44493 100644
--- a/src/libelogind/sd-bus/bus-message.c
+++ b/src/libelogind/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;
@@ -3954,12 +3969,6 @@ static int enter_struct_or_dict_entry(
                 if (r < 0)
                         return r;
 
-        } else if (c->item_size <= 0) {
-
-                /* gvariant empty struct */
-                *item_size = 0;
-                *offsets = NULL;
-                *n_offsets = 0;
         } else
                 /* gvariant with contents */
                 return build_struct_offsets(m, contents, c->item_size, item_size, offsets, n_offsets);
@@ -4146,7 +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;
@@ -4756,7 +4772,6 @@ _public_ int sd_bus_message_skip(sd_bus_message *m, const char *types) {
                         r = sd_bus_message_skip(m, s);
                         if (r < 0)
                                 return r;
-                        assert(r != 0);
 
                         r = sd_bus_message_exit_container(m);
                         if (r < 0)