logind: add virtual object paths that always can be used to refer to the callers session, user, seat or machine object

This way clients can skip invoking GetSessionByPID() for their own PID
or a similar call to access these objects.

2 files changed, 62 insertions, 42 deletions

diff --git a/src/machine/machine-dbus.c b/src/machine/machine-dbus.c
index ddd6b4b10e..db379d2f8b 100644
--- a/src/machine/machine-dbus.c
+++ b/src/machine/machine-dbus.c
@@ -23,6 +23,7 @@
 #include <string.h>
 
 #include "bus-util.h"
+#include "strv.h"
 #include "machine.h"
 
 static int property_get_id(
@@ -142,10 +143,9 @@ const sd_bus_vtable machine_vtable[] = {
 };
 
 int machine_object_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
-        _cleanup_free_ char *e = NULL;
         Manager *m = userdata;
         Machine *machine;
-        const char *p;
+        int r;
 
         assert(bus);
         assert(path);
@@ -153,17 +153,37 @@ int machine_object_find(sd_bus *bus, const char *path, const char *interface, vo
         assert(found);
         assert(m);
 
-        p = startswith(path, "/org/freedesktop/machine1/machine/");
-        if (!p)
-                return 0;
+        if (streq(path, "/org/freedesktop/machine1/machine/self")) {
+                sd_bus_message *message;
+                pid_t pid;
 
-        e = bus_path_unescape(p);
-        if (!e)
-                return -ENOMEM;
+                message = sd_bus_get_current(bus);
+                if (!message)
+                        return 0;
 
-        machine = hashmap_get(m->machines, e);
-        if (!machine)
-                return 0;
+                r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
+                if (r < 0)
+                        return 0;
+
+                r = manager_get_machine_by_pid(m, pid, &machine);
+                if (r <= 0)
+                        return 0;
+        } else {
+                _cleanup_free_ char *e = NULL;
+                const char *p;
+
+                p = startswith(path, "/org/freedesktop/machine1/machine/");
+                if (!p)
+                        return 0;
+
+                e = bus_path_unescape(p);
+                if (!e)
+                        return -ENOMEM;
+
+                machine = hashmap_get(m->machines, e);
+                if (!machine)
+                        return 0;
+        }
 
         *found = machine;
         return 1;
@@ -181,6 +201,37 @@ char *machine_bus_path(Machine *m) {
         return strappend("/org/freedesktop/machine1/machine/", e);
 }
 
+int machine_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
+        _cleanup_strv_free_ char **l = NULL;
+        Machine *machine = NULL;
+        Manager *m = userdata;
+        Iterator i;
+        int r;
+
+        assert(bus);
+        assert(path);
+        assert(nodes);
+
+        HASHMAP_FOREACH(machine, m->machines, i) {
+                char *p;
+
+                p = machine_bus_path(machine);
+                if (!p)
+                        return -ENOMEM;
+
+                r = strv_push(&l, p);
+                if (r < 0) {
+                        free(p);
+                        return r;
+                }
+        }
+
+        *nodes = l;
+        l = NULL;
+
+        return 1;
+}
+
 int machine_send_signal(Machine *m, bool new_machine) {
         _cleanup_free_ char *p = NULL;
 
diff --git a/src/machine/machined-dbus.c b/src/machine/machined-dbus.c
index 505bc17e6a..11256da989 100644
--- a/src/machine/machined-dbus.c
+++ b/src/machine/machined-dbus.c
@@ -342,37 +342,6 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_END
 };
 
-int machine_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
-        _cleanup_strv_free_ char **l = NULL;
-        Machine *machine = NULL;
-        Manager *m = userdata;
-        Iterator i;
-        int r;
-
-        assert(bus);
-        assert(path);
-        assert(nodes);
-
-        HASHMAP_FOREACH(machine, m->machines, i) {
-                char *p;
-
-                p = machine_bus_path(machine);
-                if (!p)
-                        return -ENOMEM;
-
-                r = strv_push(&l, p);
-                if (r < 0) {
-                        free(p);
-                        return r;
-                }
-        }
-
-        *nodes = l;
-        l = NULL;
-
-        return 1;
-}
-
 int match_job_removed(sd_bus *bus, sd_bus_message *message, void *userdata) {
         const char *path, *result, *unit;
         Manager *m = userdata;