SBUS: Add an async request to retrieve the caller ID

Adds an async request sbus_get_sender_id_{send,recv} that allows
retrieval of UID based on "sender" as returned by
dbus_message_get_sender().

The UID is an int64_t to be able to use "-1" to as a fallback value for
uknown or error cases.

The unit test is added as a standalone one, not part of the sbus_tests
because the request, and by extension the unit test relies on being
connected to the system bus, which is very unlikely to work in a build
system.

Reviewed-by: Pavel Březina <pbrezina@redhat.com>
Reviewed-by: Stef Walter <stefw@redhat.com>
(cherry picked from commit 0161a3c5637a0c0092bf54c436bb3d6508d7df26)

Conflicts:
	Makefile.am

1 files changed, 7 insertions, 0 deletions

diff --git a/src/sbus/sssd_dbus_connection.c b/src/sbus/sssd_dbus_connection.c
index 33d5b1a38..b42020bc2 100644
--- a/src/sbus/sssd_dbus_connection.c
+++ b/src/sbus/sssd_dbus_connection.c
@@ -173,6 +173,13 @@ int sbus_init_connection(TALLOC_CTX *ctx,
     conn->dbus.conn = dbus_conn;
     conn->connection_type = connection_type;
 
+    ret = sss_hash_create(conn, 32, &conn->clients);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create clients hash table\n");
+        talloc_free(conn);
+        return EIO;
+    }
+
     ret = sbus_conn_set_fns(conn);
     if (ret != EOK) {
         talloc_free(conn);