+ struct proto_shell_state *state;
+ struct proto_shell_handler *handler;
+ const char *argv[5];
+ char *config;
+ int ret;
+
+ state = container_of(proto, struct proto_shell_state, proto);
+ handler = state->handler;
+
+ config = blobmsg_format_json(state->config, true);
+ if (!config)
+ return -1;
+
+ argv[0] = handler->script_name;
+ argv[1] = handler->proto.name;
+ argv[2] = "teardown";
+ argv[3] = config;
+ argv[4] = NULL;
+
+ switch(cmd) {
+ case PROTO_CMD_SETUP:
+ argv[2] = "setup";
+ /* fall through */
+ case PROTO_CMD_TEARDOWN:
+ ret = run_script(argv);
+ break;
+ }
+
+ free(config);
+
+ return ret;
+}
+
+static void
+proto_shell_free(struct interface_proto_state *proto)
+{
+ struct proto_shell_state *state;
+
+ state = container_of(proto, struct proto_shell_state, proto);
+ free(state->config);
+ free(state);
+}
+
+struct interface_proto_state *
+proto_shell_attach(const struct proto_handler *h, struct interface *iface,
+ struct blob_attr *attr)
+{
+ struct proto_shell_state *state;
+
+ state = calloc(1, sizeof(*state));
+ state->config = malloc(blob_pad_len(attr));
+ if (!state->config)
+ goto error;
+
+ memcpy(state->config, attr, blob_pad_len(attr));
+ state->proto.free = proto_shell_free;
+ state->proto.cb = proto_shell_handler;
+ state->handler = container_of(h, struct proto_shell_handler, proto);
+
+ return &state->proto;
+
+error:
+ free(state);
+ return NULL;
+}
+
+static json_object *
+check_type(json_object *obj, json_type type)
+{
+ if (!obj)
+ return NULL;
+
+ if (json_object_get_type(obj) != type)
+ return NULL;
+
+ return obj;
+}
+
+static inline json_object *
+get_field(json_object *obj, const char *name, json_type type)
+{
+ return check_type(json_object_object_get(obj, name), type);
+}
+
+static char *
+proto_shell_parse_config(struct config_param_list *config, json_object *obj)
+{
+ struct blobmsg_policy *attrs;
+ char *str_buf, *str_cur;
+ int str_len = 0;
+ int i;
+
+ attrs = calloc(1, sizeof(*attrs));
+ if (!attrs)
+ return NULL;
+
+ config->n_params = json_object_array_length(obj);
+ config->params = attrs;
+ for (i = 0; i < config->n_params; i++) {
+ json_object *cur, *name, *type;
+
+ cur = check_type(json_object_array_get_idx(obj, i), json_type_array);
+ if (!cur)
+ goto error;
+
+ name = check_type(json_object_array_get_idx(cur, 0), json_type_string);
+ if (!name)
+ goto error;
+
+ type = check_type(json_object_array_get_idx(cur, 1), json_type_int);
+ if (!type)
+ goto error;
+
+ attrs[i].name = json_object_get_string(name);
+ attrs[i].type = json_object_get_int(type);
+ if (attrs[i].type > BLOBMSG_TYPE_LAST)
+ goto error;
+
+ str_len += strlen(attrs[i].name + 1);
+ }
+
+ str_buf = malloc(str_len);
+ if (!str_buf)
+ goto error;
+
+ str_cur = str_buf;
+ for (i = 0; i < config->n_params; i++) {
+ const char *name = attrs[i].name;
+
+ attrs[i].name = str_cur;
+ str_cur += sprintf(str_cur, "%s", name) + 1;
+ }
+
+ return str_buf;
+
+error:
+ free(attrs);
+ config->n_params = 0;
+ return NULL;
+}
+
+static void
+proto_shell_add_handler(const char *script, json_object *obj)
+{
+ struct proto_shell_handler *handler;
+ struct proto_handler *proto;
+ json_object *config, *tmp;
+ const char *name;
+ char *str;
+
+ if (!check_type(obj, json_type_object))
+ return;
+
+ tmp = get_field(obj, "name", json_type_string);
+ if (!tmp)