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-rw-r--r--src/libsystemd-bus/bus-internal.h2
-rw-r--r--src/libsystemd-bus/sd-bus.c32
2 files changed, 29 insertions, 5 deletions
diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index c25a208aea..345e6568dc 100644
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -123,6 +123,8 @@ struct sd_bus {
char *exec_path;
char **exec_argv;
+
+ uint64_t hello_serial;
};
static inline void bus_unrefp(sd_bus **b) {
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 08a218b7cc..314fa6b6bf 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -244,11 +244,7 @@ static int bus_send_hello(sd_bus *bus) {
if (r < 0)
return r;
- r = sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, NULL);
- if (r < 0)
- return r;
-
- return r;
+ return sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, &bus->hello_serial);
}
int bus_start_running(sd_bus *bus) {
@@ -1421,6 +1417,28 @@ static int process_timeout(sd_bus *bus) {
return r < 0 ? r : 1;
}
+static int process_hello(sd_bus *bus, sd_bus_message *m) {
+ assert(bus);
+ assert(m);
+
+ if (bus->state != BUS_HELLO)
+ return 0;
+
+ /* Let's make sure the first message on the bus is the HELLO
+ * reply. But note that we don't actually parse the message
+ * here (we leave that to the usual reply handling), we just
+ * verify we don't let any earlier msg through. */
+
+ if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_RETURN &&
+ m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
+ return -EIO;
+
+ if (m->reply_serial != bus->hello_serial)
+ return -EIO;
+
+ return 0;
+}
+
static int process_reply(sd_bus *bus, sd_bus_message *m) {
struct reply_callback *c;
int r;
@@ -1675,6 +1693,10 @@ static int process_message(sd_bus *bus, sd_bus_message *m) {
assert(bus);
assert(m);
+ r = process_hello(bus, m);
+ if (r != 0)
+ return r;
+
r = process_reply(bus, m);
if (r != 0)
return r;