Implement GetUserAttributes in the InfoPipe

This patch adds support for requesting user data in the sysdb via
the InfoPipe. It currently has support for reading defined entries
of integral, floating-point or string types.

Tasks remaining:
1) Implement call to the provider when cache is out of date
2) Support byte arrays for userpic and similar

I modified sysdb_search_ctx in sysdb_search.c to accept an array of
attributes to pass into the LDB search.

I also made one additional related fix: the btreemap now sorts in the
correct order. Previously I had accidentally transposed the two
values for sorting, so the map would always have been in exact
reverse order.

1 files changed, 29 insertions, 0 deletions

diff --git a/server/infopipe/sysbus.c b/server/infopipe/sysbus.c
index 6ba1bb72d..a90f92d5f 100644
--- a/server/infopipe/sysbus.c
+++ b/server/infopipe/sysbus.c
@@ -165,3 +165,32 @@ struct sbus_conn_ctx *sysbus_get_sbus_conn(struct sysbus_ctx *sysbus)
 {
     return sysbus->sconn;
 }
+
+char *sysbus_get_caller(TALLOC_CTX *mem_ctx, DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+    char *caller;
+    const char *conn_name;
+    DBusError error;
+    uid_t uid;
+
+    /* Get the connection UID */
+    conn_name = dbus_message_get_sender(message);
+    if (conn_name == NULL) {
+        DEBUG(0, ("Critical error: D-BUS client has no unique name\n"));
+        return NULL;
+    }
+    dbus_error_init(&error);
+    uid = dbus_bus_get_unix_user(sbus_get_connection(sconn), conn_name, &error);
+    if (uid == -1) {
+        DEBUG(0, ("Could not identify unix user. Error message was '%s:%s'\n", error.name, error.message));
+        dbus_error_free(&error);
+        return NULL;
+    }
+    caller = get_username_from_uid(mem_ctx, uid);
+    if (caller == NULL) {
+        DEBUG(0, ("No username matched the connected UID\n"));
+        return NULL;
+    }
+
+    return caller;
+}