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-rw-r--r--src/libsystemd-bus/bus-internal.h9
-rw-r--r--src/libsystemd-bus/sd-bus.c223
-rw-r--r--src/libsystemd-bus/sd-bus.h16
-rw-r--r--src/libsystemd-bus/test-bus-chat.c58
4 files changed, 285 insertions, 21 deletions
diff --git a/src/libsystemd-bus/bus-internal.h b/src/libsystemd-bus/bus-internal.h
index 56514aebbc..82f60849d5 100644
--- a/src/libsystemd-bus/bus-internal.h
+++ b/src/libsystemd-bus/bus-internal.h
@@ -48,6 +48,14 @@ struct filter_callback {
LIST_FIELDS(struct filter_callback, callbacks);
};
+struct object_callback {
+ sd_message_handler_t callback;
+ void *userdata;
+
+ char *path;
+ bool is_fallback;
+};
+
enum bus_state {
BUS_OPENING,
BUS_AUTHENTICATING,
@@ -81,6 +89,7 @@ struct sd_bus {
Prioq *reply_callbacks_prioq;
Hashmap *reply_callbacks;
LIST_HEAD(struct filter_callback, filter_callbacks);
+ Hashmap *object_callbacks;
union {
struct sockaddr sa;
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 73774ba308..88f17a2600 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -40,6 +40,7 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
static void bus_free(sd_bus *b) {
struct filter_callback *f;
+ struct object_callback *c;
unsigned i;
assert(b);
@@ -68,6 +69,13 @@ static void bus_free(sd_bus *b) {
free(f);
}
+ while ((c = hashmap_steal_first(b->object_callbacks))) {
+ free(c->path);
+ free(c);
+ }
+
+ hashmap_free(b->object_callbacks);
+
free(b);
}
@@ -1552,6 +1560,43 @@ static int process_timeout(sd_bus *bus) {
return r < 0 ? r : 1;
}
+static int process_reply(sd_bus *bus, sd_bus_message *m) {
+ struct reply_callback *c;
+ int r;
+
+ assert(bus);
+ assert(m);
+
+ if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_RETURN &&
+ m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR)
+ return 0;
+
+ c = hashmap_remove(bus->reply_callbacks, &m->reply_serial);
+ if (!c)
+ return 0;
+
+ if (c->timeout != 0)
+ prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
+
+ r = c->callback(bus, 0, m, c->userdata);
+ free(c);
+
+ return r;
+}
+
+static int process_filter(sd_bus *bus, sd_bus_message *m) {
+ struct filter_callback *l;
+ int r;
+
+ LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
+ r = l->callback(bus, 0, m, l->userdata);
+ if (r != 0)
+ return r;
+ }
+
+ return 0;
+}
+
static int process_builtin(sd_bus *bus, sd_bus_message *m) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
int r;
@@ -1603,36 +1648,90 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) {
return 1;
}
-static int process_message(sd_bus *bus, sd_bus_message *m) {
- struct filter_callback *l;
+static int process_object(sd_bus *bus, sd_bus_message *m) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT;
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ struct object_callback *c;
+ char *p;
int r;
+ bool found = false;
assert(bus);
assert(m);
- if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN || m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) {
- struct reply_callback *c;
+ if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+ return 0;
- c = hashmap_remove(bus->reply_callbacks, &m->reply_serial);
- if (c) {
- if (c->timeout != 0)
- prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
+ if (hashmap_isempty(bus->object_callbacks))
+ return 0;
- r = c->callback(bus, 0, m, c->userdata);
- free(c);
+ c = hashmap_get(bus->object_callbacks, m->path);
+ if (c) {
+ r = c->callback(bus, 0, m, c->userdata);
+ if (r != 0)
+ return r;
+
+ found = true;
+ }
+ /* Look for fallback prefixes */
+ p = strdupa(m->path);
+ for (;;) {
+ char *e;
+
+ e = strrchr(p, '/');
+ if (e == p || !e)
+ break;
+
+ *e = 0;
+
+ c = hashmap_get(bus->object_callbacks, p);
+ if (c && c->is_fallback) {
+ r = c->callback(bus, 0, m, c->userdata);
if (r != 0)
return r;
+
+ found = true;
}
}
- LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
- r = l->callback(bus, 0, m, l->userdata);
- if (r != 0)
- return r;
- }
+ if (!found)
+ return 0;
+
+ sd_bus_error_set(&error,
+ "org.freedesktop.DBus.Error.UnknownMethod",
+ "Unknown method '%s' or interface '%s'.", m->member, m->interface);
+
+ r = sd_bus_message_new_method_error(bus, m, &error, &reply);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_send(bus, reply, NULL);
+ if (r < 0)
+ return r;
- return process_builtin(bus, m);
+ return 1;
+}
+
+static int process_message(sd_bus *bus, sd_bus_message *m) {
+ int r;
+
+ assert(bus);
+ assert(m);
+
+ r = process_reply(bus, m);
+ if (r != 0)
+ return r;
+
+ r = process_filter(bus, m);
+ if (r != 0)
+ return r;
+
+ r = process_builtin(bus, m);
+ if (r != 0)
+ return r;
+
+ return process_object(bus, m);
}
int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
@@ -1874,3 +1973,95 @@ int sd_bus_remove_filter(sd_bus *bus, sd_message_handler_t callback, void *userd
return 0;
}
+
+static int bus_add_object(
+ sd_bus *bus,
+ bool fallback,
+ const char *path,
+ sd_message_handler_t callback,
+ void *userdata) {
+
+ struct object_callback *c;
+ int r;
+
+ if (!bus)
+ return -EINVAL;
+ if (!path)
+ return -EINVAL;
+ if (!callback)
+ return -EINVAL;
+
+ r = hashmap_ensure_allocated(&bus->object_callbacks, string_hash_func, string_compare_func);
+ if (r < 0)
+ return r;
+
+ c = new(struct object_callback, 1);
+ if (!c)
+ return -ENOMEM;
+
+ c->path = strdup(path);
+ if (!path) {
+ free(c);
+ return -ENOMEM;
+ }
+
+ c->callback = callback;
+ c->userdata = userdata;
+ c->is_fallback = fallback;
+
+ r = hashmap_put(bus->object_callbacks, c->path, c);
+ if (r < 0) {
+ free(c->path);
+ free(c);
+ return r;
+ }
+
+ return 0;
+}
+
+static int bus_remove_object(
+ sd_bus *bus,
+ bool fallback,
+ const char *path,
+ sd_message_handler_t callback,
+ void *userdata) {
+
+ struct object_callback *c;
+
+ if (!bus)
+ return -EINVAL;
+ if (!path)
+ return -EINVAL;
+ if (!callback)
+ return -EINVAL;
+
+ c = hashmap_get(bus->object_callbacks, path);
+ if (!c)
+ return 0;
+
+ if (c->callback != callback || c->userdata != userdata || c->is_fallback != fallback)
+ return 0;
+
+ assert_se(c == hashmap_remove(bus->object_callbacks, c->path));
+
+ free(c->path);
+ free(c);
+
+ return 1;
+}
+
+int sd_bus_add_object(sd_bus *bus, const char *path, sd_message_handler_t callback, void *userdata) {
+ return bus_add_object(bus, false, path, callback, userdata);
+}
+
+int sd_bus_remove_object(sd_bus *bus, const char *path, sd_message_handler_t callback, void *userdata) {
+ return bus_remove_object(bus, false, path, callback, userdata);
+}
+
+int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_message_handler_t callback, void *userdata) {
+ return bus_add_object(bus, true, prefix, callback, userdata);
+}
+
+int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_message_handler_t callback, void *userdata) {
+ return bus_remove_object(bus, true, prefix, callback, userdata);
+}
diff --git a/src/libsystemd-bus/sd-bus.h b/src/libsystemd-bus/sd-bus.h
index 73710d1511..b82caec5f6 100644
--- a/src/libsystemd-bus/sd-bus.h
+++ b/src/libsystemd-bus/sd-bus.h
@@ -28,15 +28,15 @@
#include "sd-bus-protocol.h"
/* TODO:
- *
* - make unix fd passing work
- * - add page donation logic
- * - api for appending/reading fixed arrays
- * - merge busctl into systemctl or so?
- * - add object handlers
* - implicitly add stub introspection calls
* - implement unix exec protocol
* - server side
+ *
+ * Later:
+ * - add page donation logic
+ * - api for appending/reading fixed arrays
+ * - merge busctl into systemctl or so?
*/
typedef struct sd_bus sd_bus;
@@ -80,6 +80,12 @@ int sd_bus_flush(sd_bus *bus);
int sd_bus_add_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata);
int sd_bus_remove_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata);
+int sd_bus_add_object(sd_bus *bus, const char *path, sd_message_handler_t callback, void *userdata);
+int sd_bus_remove_object(sd_bus *bus, const char *path, sd_message_handler_t callback, void *userdata);
+
+int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_message_handler_t callback, void *userdata);
+int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_message_handler_t callback, void *userdata);
+
/* Message object */
int sd_bus_message_new_signal(sd_bus *bus, const char *path, const char *interface, const char *member, sd_bus_message **m);
diff --git a/src/libsystemd-bus/test-bus-chat.c b/src/libsystemd-bus/test-bus-chat.c
index 23b00c7201..92fdd13faf 100644
--- a/src/libsystemd-bus/test-bus-chat.c
+++ b/src/libsystemd-bus/test-bus-chat.c
@@ -31,6 +31,37 @@
#include "bus-message.h"
#include "bus-error.h"
+static int object_callback(sd_bus *bus, int error, sd_bus_message *m, void *userdata) {
+ int r;
+
+ assert(bus);
+
+ if (error != 0)
+ return 0;
+
+ if (sd_bus_message_is_method_call(m, "org.object.test", "Foobar")) {
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+
+ log_info("Invoked Foobar() on %s", sd_bus_message_get_path(m));
+
+ r = sd_bus_message_new_method_return(bus, m, &reply);
+ if (r < 0) {
+ log_error("Failed to allocate return: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_send(bus, reply, NULL);
+ if (r < 0) {
+ log_error("Failed to send reply: %s", strerror(-r));
+ return r;
+ }
+
+ return 1;
+ }
+
+ return 0;
+}
+
static int server_init(sd_bus **_bus) {
sd_bus *bus = NULL;
sd_id128_t id;
@@ -67,6 +98,12 @@ static int server_init(sd_bus **_bus) {
goto fail;
}
+ r = sd_bus_add_fallback(bus, "/foo/bar", object_callback, NULL);
+ if (r < 0) {
+ log_error("Failed to add object: %s", strerror(-r));
+ goto fail;
+ }
+
*_bus = bus;
return 0;
@@ -297,6 +334,27 @@ static void* client2(void*p) {
r = sd_bus_message_new_method_call(
bus,
"org.freedesktop.systemd.test",
+ "/foo/bar/waldo/piep",
+ "org.object.test",
+ "Foobar",
+ &m);
+ if (r < 0) {
+ log_error("Failed to allocate method call: %s", strerror(-r));
+ goto finish;
+ }
+
+ r = sd_bus_send(bus, m, NULL);
+ if (r < 0) {
+ log_error("Failed to issue method call: %s", bus_error_message(&error, -r));
+ goto finish;
+ }
+
+ sd_bus_message_unref(m);
+ m = NULL;
+
+ r = sd_bus_message_new_method_call(
+ bus,
+ "org.freedesktop.systemd.test",
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId",
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-12 05:49:57 +0000