sbus: Refactor how we export DBus interfaces

Most importantly, stop using per connection private data. This doesn't
scale when you have more than one thing exporting or exported on a
connection.

Remove struct sbus_interface and expand sbus_conn_add_interface()
function. Remove various struct sbus_interface args to connection
initialization functions and make callers use sbus_conn_add_interface()
directly. The old method was optimized for exporting one interface
on a connection. We'll have connections that export zero, one or more
interfaces.

To export an interface on a DBus server, call sbus_conn_add_interface()
from within the sbus_server_conn_init_fn. To export an interface on
a DBus client, call sbus_conn_add_interface() after sbus_new_connection()
returns.

As before struct sbus_interface represents an object exported via DBus.
However it is now talloc allocated. One can set instance data on the
struct sbus_interface. This instance data is passed to the various
handlers and used in their implementation.

However, we now have type safe interface exporting in the various
high level sss_process_init() sss_monitor_init() and so on.

Introspection support was not in use, and is now gone until we
implement it using the metadata (future patch).

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Pavel Březina <pbrezina@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
(cherry picked from commit 07e941c1bbdc752142bbd3b838c540bc7ecd0ed7)

1 files changed, 2 insertions, 14 deletions

diff --git a/src/responder/ssh/sshsrv.c b/src/responder/ssh/sshsrv.c
index fb0738f6c..30142ae0d 100644
--- a/src/responder/ssh/sshsrv.c
+++ b/src/responder/ssh/sshsrv.c
@@ -40,12 +40,6 @@ struct mon_cli_iface monitor_ssh_methods = {
     .clearEnumCache = NULL,
 };
 
-struct sbus_interface monitor_ssh_interface = {
-    MONITOR_PATH,
-    &monitor_ssh_methods.vtable,
-    NULL
-};
-
 static struct data_provider_iface ssh_dp_methods = {
     { &data_provider_iface_meta, 0 },
     .RegisterService = NULL,
@@ -57,12 +51,6 @@ static struct data_provider_iface ssh_dp_methods = {
     .getAccountInfo = NULL,
 };
 
-struct sbus_interface ssh_dp_interface = {
-    DP_PATH,
-    &ssh_dp_methods.vtable,
-    NULL
-};
-
 static void ssh_dp_reconnect_init(struct sbus_connection *conn,
                                   int status, void *pvt)
 {
@@ -107,9 +95,9 @@ int ssh_process_init(TALLOC_CTX *mem_ctx,
                            CONFDB_SSH_CONF_ENTRY,
                            SSS_SSH_SBUS_SERVICE_NAME,
                            SSS_SSH_SBUS_SERVICE_VERSION,
-                           &monitor_ssh_interface,
+                           &monitor_ssh_methods,
                            "SSH",
-                           &ssh_dp_interface,
+                           &ssh_dp_methods.vtable,
                            &rctx);
     if (ret != EOK) {
         DEBUG(SSSDBG_FATAL_FAILURE, "sss_process_init() failed\n");