Source

File: wp-includes/class-wp-xmlrpc-server.php

protected function _multisite_getUsersBlogs( $args ) {
		$current_blog = get_site();

		$domain = $current_blog->domain;
		$path   = $current_blog->path . 'xmlrpc.php';

		$rpc = new IXR_Client( set_url_scheme( "http://{$domain}{$path}" ) );
		$rpc->query( 'wp.getUsersBlogs', $args[1], $args[2] );
		$blogs = $rpc->getResponse();

		if ( isset( $blogs['faultCode'] ) ) {
			return new IXR_Error( $blogs['faultCode'], $blogs['faultString'] );
		}

		if ( $_SERVER['HTTP_HOST'] == $domain && $_SERVER['REQUEST_URI'] == $path ) {
			return $blogs;
		} else {
			foreach ( (array) $blogs as $blog ) {
				if ( strpos( $blog['url'], $_SERVER['HTTP_HOST'] ) ) {
					return array( $blog );
				}
			}
			return array();
		}
	}