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.

1 files changed, 29 insertions, 13 deletions

diff --git a/src/login/logind-user-dbus.c b/src/login/logind-user-dbus.c
index dbd617f7a..563c7ef6b 100644
--- a/src/login/logind-user-dbus.c
+++ b/src/login/logind-user-dbus.c
@@ -236,11 +236,7 @@ const sd_bus_vtable user_vtable[] = {
 };
 
 int user_object_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
-
-        _cleanup_free_ char *e = NULL;
         Manager *m = userdata;
-        unsigned long lu;
-        const char *p;
         User *user;
         int r;
 
@@ -250,17 +246,37 @@ int user_object_find(sd_bus *bus, const char *path, const char *interface, void
         assert(found);
         assert(m);
 
-        p = startswith(path, "/org/freedesktop/login1/user/_");
-        if (!p)
-                return 0;
+        if (streq(path, "/org/freedesktop/login1/user/self")) {
+                sd_bus_message *message;
+                pid_t pid;
 
-        r = safe_atolu(p, &lu);
-        if (r < 0)
-                return 0;
+                message = sd_bus_get_current(bus);
+                if (!message)
+                        return 0;
 
-        user = hashmap_get(m->users, ULONG_TO_PTR(lu));
-        if (!user)
-                return 0;
+                r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
+                if (r < 0)
+                        return 0;
+
+                r = manager_get_user_by_pid(m, pid, &user);
+                if (r <= 0)
+                        return 0;
+        } else {
+                unsigned long lu;
+                const char *p;
+
+                p = startswith(path, "/org/freedesktop/login1/user/_");
+                if (!p)
+                        return 0;
+
+                r = safe_atolu(p, &lu);
+                if (r < 0)
+                        return 0;
+
+                user = hashmap_get(m->users, ULONG_TO_PTR(lu));
+                if (!user)
+                        return 0;
+        }
 
         *found = user;
         return 1;