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>

2 files changed, 4 insertions, 0 deletions

diff --git a/src/util/util_errors.c b/src/util/util_errors.c
index d27d20b0a..90faa3e42 100644
--- a/src/util/util_errors.c
+++ b/src/util/util_errors.c
@@ -56,6 +56,8 @@ struct err_string error_to_str[] = {
     { "No POSIX attributes detected" }, /* ERR_NO_POSIX */
     { "Extra attribute is a duplicate" }, /* ERR_DUP_EXTRA_ATTR */
     { "Malformed extra attribute" }, /* ERR_INVALID_EXTRA_ATTR */
+    { "Cannot get bus message sender" }, /* ERR_SBUS_GET_SENDER_ERROR */
+    { "Bus message has no sender" }, /* ERR_SBUS_NO_SENDER */
 };
 
 
diff --git a/src/util/util_errors.h b/src/util/util_errors.h
index f03fc16b1..4d9f16c0a 100644
--- a/src/util/util_errors.h
+++ b/src/util/util_errors.h
@@ -78,6 +78,8 @@ enum sssd_errors {
     ERR_NO_POSIX,
     ERR_DUP_EXTRA_ATTR,
     ERR_INVALID_EXTRA_ATTR,
+    ERR_SBUS_GET_SENDER_ERROR,
+    ERR_SBUS_NO_SENDER,
     ERR_LAST            /* ALWAYS LAST */
 };