1 files changed, 589 insertions, 0 deletions

diff --git a/src/nvme/json.c b/src/nvme/json.c
new file mode 100644
index 0000000..b49498a
--- /dev/null
+++ b/src/nvme/json.c
@@ -0,0 +1,589 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * This file is part of libnvme.
+ * Copyright (c) 2021 SUSE Software Solutions
+ *
+ * Authors: Hannes Reinecke <hare@suse.de>
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <json.h>
+
+#include "cleanup.h"
+#include "fabrics.h"
+#include "log.h"
+#include "private.h"
+#include "linux.h"
+
+#define JSON_UPDATE_INT_OPTION(c, k, a, o)				\
+	if (!strcmp(# a, k ) && !c->a) c->a = json_object_get_int(o);
+#define JSON_UPDATE_BOOL_OPTION(c, k, a, o)				\
+	if (!strcmp(# a, k ) && !c->a) c->a = json_object_get_boolean(o);
+
+static void json_update_attributes(nvme_ctrl_t c,
+				   struct json_object *ctrl_obj)
+{
+	struct nvme_fabrics_config *cfg = nvme_ctrl_get_config(c);
+
+	json_object_object_foreach(ctrl_obj, key_str, val_obj) {
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       nr_io_queues, val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       nr_write_queues, val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       nr_poll_queues, val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       queue_size, val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       keep_alive_tmo, val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       reconnect_delay, val_obj);
+		if (!strcmp("ctrl_loss_tmo", key_str) &&
+		    cfg->ctrl_loss_tmo != NVMF_DEF_CTRL_LOSS_TMO)
+			cfg->ctrl_loss_tmo = json_object_get_int(val_obj);
+		JSON_UPDATE_INT_OPTION(cfg, key_str,
+				       fast_io_fail_tmo, val_obj);
+		if (!strcmp("tos", key_str) && cfg->tos != -1)
+			cfg->tos = json_object_get_int(val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					duplicate_connect, val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					disable_sqflow, val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					hdr_digest, val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					data_digest, val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					tls, val_obj);
+		JSON_UPDATE_BOOL_OPTION(cfg, key_str,
+					concat, val_obj);
+		if (!strcmp("persistent", key_str) &&
+		    !nvme_ctrl_is_persistent(c))
+			nvme_ctrl_set_persistent(c, true);
+		if (!strcmp("discovery", key_str) &&
+		    !nvme_ctrl_is_discovery_ctrl(c))
+			nvme_ctrl_set_discovery_ctrl(c, true);
+		/*
+		 * The JSON configuration holds the keyring description
+		 * which needs to be converted into the keyring serial number.
+		 */
+		if (!strcmp("keyring", key_str) && cfg->keyring == 0) {
+			long keyring;
+
+			keyring = nvme_lookup_keyring(json_object_get_string(val_obj));
+			if (keyring) {
+				cfg->keyring = keyring;
+				nvme_set_keyring(cfg->keyring);
+			}
+		}
+		if (!strcmp("tls_key", key_str) && cfg->tls_key == 0) {
+			long key;
+
+			key = nvme_lookup_key("psk",
+					      json_object_get_string(val_obj));
+			if (key)
+				cfg->tls_key = key;
+		}
+	}
+}
+
+static void json_parse_port(nvme_subsystem_t s, struct json_object *port_obj)
+{
+	nvme_ctrl_t c;
+	struct json_object *attr_obj;
+	const char *transport, *traddr = NULL;
+	const char *host_traddr = NULL, *host_iface = NULL, *trsvcid = NULL;
+
+	attr_obj = json_object_object_get(port_obj, "transport");
+	if (!attr_obj)
+		return;
+	transport = json_object_get_string(attr_obj);
+	attr_obj = json_object_object_get(port_obj, "traddr");
+	if (attr_obj)
+		traddr = json_object_get_string(attr_obj);
+	attr_obj = json_object_object_get(port_obj, "host_traddr");
+	if (attr_obj)
+		host_traddr = json_object_get_string(attr_obj);
+	attr_obj = json_object_object_get(port_obj, "host_iface");
+	if (attr_obj)
+		host_iface = json_object_get_string(attr_obj);
+	attr_obj = json_object_object_get(port_obj, "trsvcid");
+	if (attr_obj)
+		trsvcid = json_object_get_string(attr_obj);
+	c = nvme_lookup_ctrl(s, transport, traddr, host_traddr,
+			     host_iface, trsvcid, NULL);
+	if (!c)
+		return;
+	json_update_attributes(c, port_obj);
+	attr_obj = json_object_object_get(port_obj, "dhchap_key");
+	if (attr_obj)
+		nvme_ctrl_set_dhchap_host_key(c, json_object_get_string(attr_obj));
+	attr_obj = json_object_object_get(port_obj, "dhchap_ctrl_key");
+	if (attr_obj)
+		nvme_ctrl_set_dhchap_key(c, json_object_get_string(attr_obj));
+}
+
+static void json_parse_subsys(nvme_host_t h, struct json_object *subsys_obj)
+{
+	struct json_object *nqn_obj, *app_obj, *port_array;
+	nvme_subsystem_t s;
+	const char *nqn;
+	int p;
+
+	nqn_obj = json_object_object_get(subsys_obj, "nqn");
+	if (!nqn_obj)
+		return;
+	nqn = json_object_get_string(nqn_obj);
+	s = nvme_lookup_subsystem(h, NULL, nqn);
+	if (!s)
+		return;
+	app_obj = json_object_object_get(subsys_obj, "application");
+	if (app_obj)
+		nvme_subsystem_set_application(s, json_object_get_string(app_obj));
+
+	port_array = json_object_object_get(subsys_obj, "ports");
+	if (!port_array)
+		return;
+	for (p = 0; p < json_object_array_length(port_array); p++) {
+		struct json_object *port_obj;
+
+		port_obj = json_object_array_get_idx(port_array, p);
+		if (port_obj)
+			json_parse_port(s, port_obj);
+	}
+}
+
+static void json_parse_host(nvme_root_t r, struct json_object *host_obj)
+{
+	struct json_object *attr_obj, *subsys_array, *subsys_obj;
+	nvme_host_t h;
+	const char *hostnqn, *hostid = NULL;
+	int s;
+
+	attr_obj = json_object_object_get(host_obj, "hostnqn");
+	if (!attr_obj)
+		return;
+	hostnqn = json_object_get_string(attr_obj);
+	attr_obj = json_object_object_get(host_obj, "hostid");
+	if (attr_obj)
+		hostid = json_object_get_string(attr_obj);
+	h = nvme_lookup_host(r, hostnqn, hostid);
+	attr_obj = json_object_object_get(host_obj, "dhchap_key");
+	if (attr_obj)
+		nvme_host_set_dhchap_key(h, json_object_get_string(attr_obj));
+	attr_obj = json_object_object_get(host_obj, "hostsymname");
+	if (attr_obj)
+		nvme_host_set_hostsymname(h, json_object_get_string(attr_obj));
+	attr_obj = json_object_object_get(host_obj, "persistent_discovery_ctrl");
+	if (attr_obj)
+		nvme_host_set_pdc_enabled(h, json_object_get_boolean(attr_obj));
+	subsys_array = json_object_object_get(host_obj, "subsystems");
+	if (!subsys_array)
+		return;
+	for (s = 0; s < json_object_array_length(subsys_array); s++) {
+		subsys_obj = json_object_array_get_idx(subsys_array, s);
+		if (subsys_obj)
+			json_parse_subsys(h, subsys_obj);
+	}
+}
+
+static DEFINE_CLEANUP_FUNC(cleanup_tokener, json_tokener *, json_tokener_free)
+#define _cleanup_tokener_ __cleanup__(cleanup_tokener)
+
+static struct json_object *parse_json(nvme_root_t r, int fd)
+{
+	char buf[JSON_FILE_BUF_SIZE];
+	struct json_object *obj;
+	char *str = NULL;
+	_cleanup_tokener_ json_tokener *tok = NULL;
+	int ret;
+	_cleanup_free_ void *ptr = NULL;
+	int len = 0;
+
+	while ((ret = read(fd, buf, JSON_FILE_BUF_SIZE)) > 0) {
+		str = realloc(ptr, len + ret);
+		if (!str)
+			return NULL;
+		memcpy(&str[len], buf, ret);
+		len += ret;
+		ptr = str;
+	}
+
+	if (ret < 0 || !len)
+		return NULL;
+
+	tok = json_tokener_new_ex(JSON_TOKENER_DEFAULT_DEPTH);
+	if (!tok)
+		return NULL;
+
+	/* Enforce correctly formatted JSON */
+	tok->flags = JSON_TOKENER_STRICT;
+
+	obj = json_tokener_parse_ex(tok, str, len);
+	if (!obj)
+		nvme_msg(r, LOG_DEBUG, "JSON parsing failed: %s\n",
+			 json_util_get_last_err());
+
+	return obj;
+}
+
+int json_read_config(nvme_root_t r, const char *config_file)
+{
+	struct json_object *json_root, *host_obj;
+	int fd, h;
+
+	fd = open(config_file, O_RDONLY);
+	if (fd < 0) {
+		nvme_msg(r, LOG_DEBUG, "Error opening %s, %s\n",
+			 config_file, strerror(errno));
+		return fd;
+	}
+	json_root = parse_json(r, fd);
+	close(fd);
+	if (!json_root) {
+		errno = EPROTO;
+		return -1;
+	}
+	if (!json_object_is_type(json_root, json_type_array)) {
+		nvme_msg(r, LOG_DEBUG, "Wrong format, expected array\n");
+		json_object_put(json_root);
+		errno = EPROTO;
+		return -1;
+	}
+	for (h = 0; h < json_object_array_length(json_root); h++) {
+		host_obj = json_object_array_get_idx(json_root, h);
+		if (host_obj)
+			json_parse_host(r, host_obj);
+	}
+	json_object_put(json_root);
+	return 0;
+}
+
+#define JSON_STRING_OPTION(c, p, o)					\
+	if ((c)->o && strcmp((c)->o, "none"))				\
+		json_object_object_add((p), # o ,			\
+				       json_object_new_string((c)->o))
+#define JSON_INT_OPTION(c, p, o, d)					\
+	if ((c)->o != d)						\
+		json_object_object_add((p), # o ,			\
+				       json_object_new_int((c)->o))
+#define JSON_BOOL_OPTION(c, p, o)					\
+	if ((c)->o)							\
+		json_object_object_add((p), # o ,			\
+				       json_object_new_boolean((c)->o))
+
+static void json_update_port(struct json_object *ctrl_array, nvme_ctrl_t c)
+{
+	struct nvme_fabrics_config *cfg = nvme_ctrl_get_config(c);
+	struct json_object *port_obj = json_object_new_object();
+	const char *transport, *value;
+
+	transport = nvme_ctrl_get_transport(c);
+	json_object_object_add(port_obj, "transport",
+			       json_object_new_string(transport));
+	value = nvme_ctrl_get_traddr(c);
+	if (value)
+		json_object_object_add(port_obj, "traddr",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_host_traddr(c);
+	if (value)
+		json_object_object_add(port_obj, "host_traddr",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_host_iface(c);
+	if (value)
+		json_object_object_add(port_obj, "host_iface",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_trsvcid(c);
+	if (value)
+		json_object_object_add(port_obj, "trsvcid",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_dhchap_host_key(c);
+	if (value)
+		json_object_object_add(port_obj, "dhchap_key",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_dhchap_key(c);
+	if (value)
+		json_object_object_add(port_obj, "dhchap_ctrl_key",
+				       json_object_new_string(value));
+	JSON_INT_OPTION(cfg, port_obj, nr_io_queues, 0);
+	JSON_INT_OPTION(cfg, port_obj, nr_write_queues, 0);
+	JSON_INT_OPTION(cfg, port_obj, nr_poll_queues, 0);
+	JSON_INT_OPTION(cfg, port_obj, queue_size, 0);
+	JSON_INT_OPTION(cfg, port_obj, keep_alive_tmo, 0);
+	JSON_INT_OPTION(cfg, port_obj, reconnect_delay, 0);
+	if (strcmp(transport, "loop")) {
+		JSON_INT_OPTION(cfg, port_obj, ctrl_loss_tmo,
+				NVMF_DEF_CTRL_LOSS_TMO);
+		JSON_INT_OPTION(cfg, port_obj, fast_io_fail_tmo, 0);
+	}
+	JSON_INT_OPTION(cfg, port_obj, tos, -1);
+	JSON_BOOL_OPTION(cfg, port_obj, duplicate_connect);
+	JSON_BOOL_OPTION(cfg, port_obj, disable_sqflow);
+	JSON_BOOL_OPTION(cfg, port_obj, hdr_digest);
+	JSON_BOOL_OPTION(cfg, port_obj, data_digest);
+	JSON_BOOL_OPTION(cfg, port_obj, tls);
+	JSON_BOOL_OPTION(cfg, port_obj, concat);
+	if (nvme_ctrl_is_persistent(c))
+		json_object_object_add(port_obj, "persistent",
+				       json_object_new_boolean(true));
+	if (nvme_ctrl_is_discovery_ctrl(c))
+		json_object_object_add(port_obj, "discovery",
+				       json_object_new_boolean(true));
+	/*
+	 * Store the keyring description in the JSON config file.
+	 */
+	if (cfg->keyring) {
+		_cleanup_free_ char *desc =
+			nvme_describe_key_serial(cfg->keyring);
+
+		if (desc) {
+			json_object_object_add(port_obj, "keyring",
+					       json_object_new_string(desc));
+		}
+	}
+	if (cfg->tls_key) {
+		_cleanup_free_ char *desc =
+			nvme_describe_key_serial(cfg->tls_key);
+
+		if (desc) {
+			json_object_object_add(port_obj, "tls_key",
+					       json_object_new_string(desc));
+		}
+	}
+
+	json_object_array_add(ctrl_array, port_obj);
+}
+
+static void json_update_subsys(struct json_object *subsys_array,
+			       nvme_subsystem_t s)
+{
+	nvme_ctrl_t c;
+	const char *subsysnqn = nvme_subsystem_get_nqn(s), *app;
+	struct json_object *subsys_obj = json_object_new_object();
+	struct json_object *port_array;
+
+	/* Skip discovery subsystems as the nqn is not unique */
+	if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME))
+		return;
+
+	json_object_object_add(subsys_obj, "nqn",
+			       json_object_new_string(subsysnqn));
+	app = nvme_subsystem_get_application(s);
+	if (app)
+		json_object_object_add(subsys_obj, "application",
+				       json_object_new_string(app));
+	port_array = json_object_new_array();
+	nvme_subsystem_for_each_ctrl(s, c) {
+		json_update_port(port_array, c);
+	}
+	if (json_object_array_length(port_array))
+		json_object_object_add(subsys_obj, "ports", port_array);
+	else
+		json_object_put(port_array);
+	json_object_array_add(subsys_array, subsys_obj);
+}
+
+int json_update_config(nvme_root_t r, const char *config_file)
+{
+	nvme_host_t h;
+	struct json_object *json_root, *host_obj;
+	struct json_object *subsys_array;
+	int ret = 0;
+
+	json_root = json_object_new_array();
+	nvme_for_each_host(r, h) {
+		nvme_subsystem_t s;
+		const char *hostnqn, *hostid, *dhchap_key, *hostsymname;
+
+		host_obj = json_object_new_object();
+		if (!host_obj)
+			continue;
+		hostnqn = nvme_host_get_hostnqn(h);
+		json_object_object_add(host_obj, "hostnqn",
+				       json_object_new_string(hostnqn));
+		hostid = nvme_host_get_hostid(h);
+		if (hostid)
+			json_object_object_add(host_obj, "hostid",
+					       json_object_new_string(hostid));
+		dhchap_key = nvme_host_get_dhchap_key(h);
+		if (dhchap_key)
+			json_object_object_add(host_obj, "dhchap_key",
+					       json_object_new_string(dhchap_key));
+		hostsymname = nvme_host_get_hostsymname(h);
+		if (hostsymname)
+			json_object_object_add(host_obj, "hostsymname",
+					       json_object_new_string(hostsymname));
+		if (h->pdc_enabled_valid)
+			json_object_object_add(host_obj, "persistent_discovery_ctrl",
+					       json_object_new_boolean(h->pdc_enabled));
+		subsys_array = json_object_new_array();
+		nvme_for_each_subsystem(h, s) {
+			json_update_subsys(subsys_array, s);
+		}
+		if (json_object_array_length(subsys_array))
+			json_object_object_add(host_obj, "subsystems",
+						    subsys_array);
+		else
+			json_object_put(subsys_array);
+		json_object_array_add(json_root, host_obj);
+	}
+	if (!config_file) {
+		ret = json_object_to_fd(1, json_root, JSON_C_TO_STRING_PRETTY);
+		printf("\n");
+	} else
+		ret = json_object_to_file_ext(config_file, json_root,
+					      JSON_C_TO_STRING_PRETTY);
+	if (ret < 0) {
+		nvme_msg(r, LOG_ERR, "Failed to write to %s, %s\n",
+			 config_file ? "stdout" : config_file,
+			 json_util_get_last_err());
+		ret = -1;
+		errno = EIO;
+	}
+	json_object_put(json_root);
+
+	return ret;
+}
+
+static void json_dump_ctrl(struct json_object *ctrl_array, nvme_ctrl_t c)
+{
+	struct nvme_fabrics_config *cfg = nvme_ctrl_get_config(c);
+	struct json_object *ctrl_obj = json_object_new_object();
+	const char *name, *transport, *value;
+
+	name = nvme_ctrl_get_name(c);
+	if (name && strlen(name))
+		json_object_object_add(ctrl_obj, "name",
+				       json_object_new_string(name));
+	transport = nvme_ctrl_get_transport(c);
+	json_object_object_add(ctrl_obj, "transport",
+			       json_object_new_string(transport));
+	value = nvme_ctrl_get_traddr(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "traddr",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_host_traddr(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "host_traddr",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_host_iface(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "host_iface",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_trsvcid(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "trsvcid",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_dhchap_host_key(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "dhchap_key",
+				       json_object_new_string(value));
+	value = nvme_ctrl_get_dhchap_key(c);
+	if (value)
+		json_object_object_add(ctrl_obj, "dhchap_ctrl_key",
+				       json_object_new_string(value));
+	JSON_INT_OPTION(cfg, ctrl_obj, nr_io_queues, 0);
+	JSON_INT_OPTION(cfg, ctrl_obj, nr_write_queues, 0);
+	JSON_INT_OPTION(cfg, ctrl_obj, nr_poll_queues, 0);
+	JSON_INT_OPTION(cfg, ctrl_obj, queue_size, 0);
+	JSON_INT_OPTION(cfg, ctrl_obj, keep_alive_tmo, 0);
+	JSON_INT_OPTION(cfg, ctrl_obj, reconnect_delay, 0);
+	if (strcmp(transport, "loop")) {
+		JSON_INT_OPTION(cfg, ctrl_obj, ctrl_loss_tmo,
+				NVMF_DEF_CTRL_LOSS_TMO);
+		JSON_INT_OPTION(cfg, ctrl_obj, fast_io_fail_tmo, 0);
+	}
+	JSON_INT_OPTION(cfg, ctrl_obj, tos, -1);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, duplicate_connect);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, disable_sqflow);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, hdr_digest);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, data_digest);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, tls);
+	JSON_BOOL_OPTION(cfg, ctrl_obj, concat);
+	if (nvme_ctrl_is_persistent(c))
+		json_object_object_add(ctrl_obj, "persistent",
+				       json_object_new_boolean(true));
+	if (nvme_ctrl_is_discovery_ctrl(c))
+		json_object_object_add(ctrl_obj, "discovery",
+				       json_object_new_boolean(true));
+	json_object_array_add(ctrl_array, ctrl_obj);
+}
+
+static void json_dump_subsys(struct json_object *subsys_array,
+			       nvme_subsystem_t s)
+{
+	nvme_ctrl_t c;
+	struct json_object *subsys_obj = json_object_new_object();
+	struct json_object *ctrl_array;
+
+	json_object_object_add(subsys_obj, "name",
+			       json_object_new_string(nvme_subsystem_get_name(s)));
+	json_object_object_add(subsys_obj, "nqn",
+			       json_object_new_string(nvme_subsystem_get_nqn(s)));
+	ctrl_array = json_object_new_array();
+	nvme_subsystem_for_each_ctrl(s, c) {
+		json_dump_ctrl(ctrl_array, c);
+	}
+	if (json_object_array_length(ctrl_array))
+		json_object_object_add(subsys_obj, "controllers", ctrl_array);
+	else
+		json_object_put(ctrl_array);
+	json_object_array_add(subsys_array, subsys_obj);
+}
+
+int json_dump_tree(nvme_root_t r)
+{
+	nvme_host_t h;
+	struct json_object *json_root, *host_obj;
+	struct json_object *host_array, *subsys_array;
+	int ret = 0;
+
+	json_root = json_object_new_object();
+	host_array = json_object_new_array();
+	nvme_for_each_host(r, h) {
+		nvme_subsystem_t s;
+		const char *hostid, *dhchap_key;
+
+		host_obj = json_object_new_object();
+		json_object_object_add(host_obj, "hostnqn",
+				       json_object_new_string(nvme_host_get_hostnqn(h)));
+		hostid = nvme_host_get_hostid(h);
+		if (hostid)
+			json_object_object_add(host_obj, "hostid",
+					       json_object_new_string(hostid));
+		dhchap_key = nvme_host_get_dhchap_key(h);
+		if (dhchap_key)
+			json_object_object_add(host_obj, "dhchap_key",
+					       json_object_new_string(dhchap_key));
+		if (h->pdc_enabled_valid)
+			json_object_object_add(host_obj, "persistent_discovery_ctrl",
+					       json_object_new_boolean(h->pdc_enabled));
+		subsys_array = json_object_new_array();
+		nvme_for_each_subsystem(h, s) {
+			json_dump_subsys(subsys_array, s);
+		}
+		if (json_object_array_length(subsys_array))
+			json_object_object_add(host_obj, "subsystems",
+					       subsys_array);
+		else
+			json_object_put(subsys_array);
+		json_object_array_add(host_array, host_obj);
+	}
+	json_object_object_add(json_root, "hosts", host_array);
+
+	ret = json_object_to_fd(fileno(r->fp), json_root, JSON_C_TO_STRING_PRETTY);
+	if (ret < 0) {
+		nvme_msg(r, LOG_ERR, "Failed to write, %s\n",
+			 json_util_get_last_err());
+		ret = -1;
+		errno = EIO;
+	}
+	json_object_put(json_root);
+
+	return ret;
+}