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|
// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
/// @file netconf.cc
/// Contains the Netconf agent methods.
#include <config.h>
#include <cc/command_interpreter.h>
#include <netconf/netconf.h>
#include <netconf/netconf_controller.h>
#include <netconf/netconf_log.h>
#include <yang/translator_config.h>
#include <yang/yang_revisions.h>
#include <sstream>
#include <vector>
using namespace std;
using namespace isc::config;
using namespace isc::data;
using namespace isc::netconf;
using namespace isc::yang;
using namespace libyang;
using namespace sysrepo;
namespace {
/// @brief Module change subscription callback.
class NetconfAgentCallback {
public:
/// @brief Constructor.
///
/// @param service_pair The service name and configuration pair.
NetconfAgentCallback(const CfgServersMapPair& service_pair)
: service_pair_(service_pair) {
}
/// @brief Server name and configuration pair.
CfgServersMapPair const service_pair_;
/// @brief Module configuration change callback.
///
/// This callback is called by sysrepo when there is a change to
/// module configuration.
///
/// @param sess The running datastore session.
/// @param module_name The module name.
/// @param event The event.
/// @param private_ctx The private context.
/// @return the sysrepo return code.
sysrepo::ErrorCode module_change(Session sess,
uint32_t /* subscription_id */,
string_view module_name,
optional<string_view> /* sub_xpath */,
Event event,
uint32_t /* request_id */) {
ostringstream event_type;
switch (event) {
case Event::Update:
// This could potentially be a hook point for mid-flight
// configuration changes.
event_type << "Event::Update";
break;
case Event::Change:
event_type << "Event::Change";
break;
case Event::Done:
event_type << "Event::Done";
break;
case Event::Abort:
event_type << "Event::Abort";
break;
case Event::Enabled:
event_type << "Event::Enabled";
break;
case Event::RPC:
event_type << "Event::RPC";
break;
default:
event_type << "UNKNOWN (" << event << ")";
break;
}
LOG_INFO(netconf_logger, NETCONF_CONFIG_CHANGE_EVENT)
.arg(event_type.str());
NetconfAgent::logChanges(sess, module_name);
switch (event) {
case Event::Change:
return (NetconfAgent::change(sess, service_pair_));
case Event::Done:
return (NetconfAgent::done(sess, service_pair_));
default:
return (sysrepo::ErrorCode::Ok);
}
}
void event_notif(Session /* session */,
uint32_t /* subscription_id */,
NotificationType const notification_type,
optional<DataNode> const notification_tree,
NotificationTimeStamp const /* timestamp */) {
string n;
switch (notification_type) {
case NotificationType::Realtime:
n = "NotificationType::Realtime";
break;
case NotificationType::Replay:
n = "NotificationType::Replay";
break;
case NotificationType::ReplayComplete:
n = "NotificationType::ReplayComplete";
break;
case NotificationType::Terminated:
n = "NotificationType::Terminated";
break;
case NotificationType::Modified:
n = "NotificationType::Modified";
break;
case NotificationType::Suspended:
n = "NotificationType::Suspended";
break;
case NotificationType::Resumed:
n = "NotificationType::Resumed";
break;
}
optional<string> const str(
notification_tree->printStr(DataFormat::JSON, PrintFlags::WithDefaultsExplicit));
string const tree(str ? *str : string());
LOG_INFO(netconf_logger, NETCONF_NOTIFICATION_RECEIVED)
.arg(n)
.arg(service_pair_.first)
.arg(tree);
}
}; // NetconfAgentCallback
} //anonymous namespace
namespace isc {
namespace netconf {
NetconfAgent::~NetconfAgent() {
clear();
}
void
NetconfAgent::init(NetconfCfgMgrPtr cfg_mgr) {
// Check for a configuration manager.
if (!cfg_mgr) {
isc_throw(Unexpected, "missing configuration manager");
return;
}
// Retrieve configuration from existing running DHCP daemons.
const CfgServersMapPtr& servers =
cfg_mgr->getNetconfConfig()->getCfgServersMap();
for (auto const& pair : *servers) {
keaConfig(pair);
}
// Initialize sysrepo.
initSysrepo();
// Check modules / revisions.
checkModules(servers);
for (auto const& pair : *servers) {
yangConfig(pair);
subscribeToDataChanges(pair);
subscribeToNotifications(pair);
}
}
void
NetconfAgent::clear() {
subscriptions_.clear();
running_sess_.reset();
startup_sess_.reset();
}
void
NetconfAgent::keaConfig(const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
// If the boot-update flag is not set.
if (!configuration->getBootUpdate()) {
return;
}
CfgControlSocketPtr ctrl_sock = configuration->getCfgControlSocket();
if (!ctrl_sock) {
return;
}
ControlSocketBasePtr comm;
try {
comm = controlSocketFactory(ctrl_sock);
} catch (exception const& ex) {
ostringstream msg;
msg << "createControlSocket failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_GET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
ConstElementPtr answer;
int rcode;
ConstElementPtr config;
LOG_INFO(netconf_logger, NETCONF_GET_CONFIG_STARTED)
.arg(server);
try {
answer = comm->configGet(server);
config = parseAnswer(rcode, answer);
} catch (exception const& ex) {
ostringstream msg;
msg << "config-get command failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_GET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
if (rcode != CONTROL_RESULT_SUCCESS) {
ostringstream msg;
msg << "config-get command returned " << answerToText(answer);
LOG_ERROR(netconf_logger, NETCONF_GET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
if (!config) {
LOG_ERROR(netconf_logger, NETCONF_GET_CONFIG_FAILED)
.arg(server)
.arg("config-get command returned an empty configuration");
return;
}
LOG_DEBUG(netconf_logger, NETCONF_DBG_TRACE_DETAIL_DATA,
NETCONF_GET_CONFIG)
.arg(server)
.arg(prettyPrint(config));
}
void
NetconfAgent::initSysrepo() {
try {
running_sess_ = Connection{}.sessionStart();
running_sess_->switchDatastore(Datastore::Running);
startup_sess_ = Connection{}.sessionStart();
startup_sess_->switchDatastore(Datastore::Startup);
} catch (exception const& ex) {
isc_throw(Unexpected, "Can't establish a sysrepo session: "
<< ex.what());
}
// Retrieve names and revisions of installed modules from sysrepo.
getModules();
}
void NetconfAgent::getModules() {
vector<Module> modules;
try {
Context context(running_sess_->getContext());
modules = context.modules();
} catch (Error const& ex) {
isc_throw(Unexpected, "can't retrieve available modules: " << ex.what());
}
for (Module const& module : modules) {
string const name(module.name());
if (!module.revision()) {
isc_throw(Unexpected,
"could not retrieve module revision for module " << name);
}
string const revision(*module.revision());
modules_.emplace(name, revision);
}
}
bool
NetconfAgent::checkModule(const string& module_name) const {
auto module = modules_.find(module_name);
if (module == modules_.end()) {
LOG_ERROR(netconf_logger, NETCONF_MODULE_MISSING_ERR)
.arg(module_name);
return (false);
}
auto modrev = YANG_REVISIONS.find(module_name);
if (modrev == YANG_REVISIONS.end()) {
// Can't check revision?!
// It can happen only with a module which is not in
// YANG_REVISIONS but installed so likely on purpose.
return (true);
}
if (modrev->second != module->second) {
LOG_ERROR(netconf_logger, NETCONF_MODULE_REVISION_ERR)
.arg(module_name)
.arg(modrev->second)
.arg(module->second);
return (false);
}
return (true);
}
void
NetconfAgent::checkModules(CfgServersMapPtr const& servers /* = {} */) const {
bool faulty_model(false);
if (servers) {
for (auto pair : *servers) {
if (!checkModule(pair.second->getModel())) {
faulty_model = true;
}
}
}
if (faulty_model) {
isc_throw(Unexpected, "YANG module is missing or its revision is not "
"supported. Check logs for details.");
}
for (auto modrev : YANG_REVISIONS) {
auto module = modules_.find(modrev.first);
if (module == modules_.end()) {
LOG_WARN(netconf_logger, NETCONF_MODULE_MISSING_WARN)
.arg(modrev.first);
continue;
}
if (modrev.second != module->second) {
LOG_WARN(netconf_logger, NETCONF_MODULE_REVISION_WARN)
.arg(modrev.first)
.arg(modrev.second)
.arg(module->second);
}
}
}
void
NetconfAgent::yangConfig(const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
// If we're shutting down, or the boot-update flag is not set or the model
// associated with it is not specified.
if (!configuration->getBootUpdate() ||
configuration->getModel().empty()) {
return;
}
// First we need a way to reach the actual servers.
CfgControlSocketPtr ctrl_sock = configuration->getCfgControlSocket();
if (!ctrl_sock) {
return;
}
LOG_INFO(netconf_logger, NETCONF_SET_CONFIG_STARTED)
.arg(server);
ElementPtr config;
try {
// Retrieve configuration from Sysrepo.
TranslatorConfig tc(*startup_sess_, configuration->getModel());
config = tc.getConfig();
if (!config) {
ostringstream msg;
msg << "YANG configuration for "
<< configuration->getModel()
<< " is empty";
LOG_ERROR(netconf_logger, NETCONF_SET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
} else {
LOG_DEBUG(netconf_logger, NETCONF_DBG_TRACE_DETAIL_DATA,
NETCONF_SET_CONFIG)
.arg(server)
.arg(prettyPrint(config));
}
} catch (exception const& ex) {
ostringstream msg;
msg << "get YANG configuration for " << server
<< " failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_SET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
ControlSocketBasePtr comm;
try {
comm = controlSocketFactory(ctrl_sock);
} catch (exception const& ex) {
ostringstream msg;
msg << "control socket creation failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_SET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
ConstElementPtr answer;
int rcode;
try {
answer = comm->configSet(config, server);
parseAnswer(rcode, answer);
} catch (exception const& ex) {
ostringstream msg;
msg << "config-set command failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_SET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
if (rcode != CONTROL_RESULT_SUCCESS) {
ostringstream msg;
msg << "config-set command returned " << answerToText(answer);
LOG_ERROR(netconf_logger, NETCONF_SET_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return;
}
LOG_INFO(netconf_logger, NETCONF_BOOT_UPDATE_COMPLETED)
.arg(server);
}
void
NetconfAgent::subscribeToDataChanges(const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
string const& model(configuration->getModel());
// If we're shutting down, or the subscribe-changes flag is not set or
// the model is not specified, give up on subscribing.
if (!configuration->getSubscribeChanges() || model.empty()) {
return;
}
LOG_INFO(netconf_logger, NETCONF_SUBSCRIBE_CONFIG)
.arg(server)
.arg(model);
auto callback = [=](Session session,
uint32_t subscription_id,
string_view module_name,
optional<string_view> sub_xpath,
Event event,
uint32_t request_id) {
NetconfAgentCallback agent(service_pair);
return agent.module_change(session, subscription_id, module_name, sub_xpath, event, request_id);
};
try {
SubscribeOptions options(SubscribeOptions::Default);
if (!configuration->getValidateChanges()) {
options = options | SubscribeOptions::DoneOnly;
}
Subscription subscription(
running_sess_->onModuleChange(model, callback, nullopt, 0, options));
subscriptions_.emplace(server, std::forward<Subscription>(subscription));
} catch (exception const& ex) {
ostringstream msg;
msg << "module change subscribe failed with " << ex.what();
msg << "change subscription for model " << model <<
" failed with: " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_SUBSCRIBE_CONFIG_FAILED)
.arg(server)
.arg(configuration->getModel())
.arg(msg.str());
return;
}
}
void
NetconfAgent::subscribeToNotifications(const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
string const& model(configuration->getModel());
// If we're shutting down, or the subscribe-changes flag is not set or
// the model is not specified, give up on subscribing.
if (!configuration->getSubscribeNotifications() || model.empty()) {
return;
}
LOG_INFO(netconf_logger, NETCONF_SUBSCRIBE_NOTIFICATIONS)
.arg(server)
.arg(model);
auto callback = [=](Session session,
uint32_t subscription_id,
NotificationType const notification_type,
optional<DataNode> const notification_tree,
NotificationTimeStamp const timestamp) {
NetconfAgentCallback agent(service_pair);
return agent.event_notif(session, subscription_id, notification_type, notification_tree, timestamp);
};
try {
Subscription subscription(running_sess_->onNotification(model, callback));
subscriptions_.emplace(server, std::forward<Subscription>(subscription));
} catch (exception const& ex) {
ostringstream msg;
msg << "event notification subscription for model " << model <<
" failed with: " << ex.what();
LOG_WARN(netconf_logger, NETCONF_NOT_SUBSCRIBED_TO_NOTIFICATIONS)
.arg(server)
.arg(configuration->getModel())
.arg(msg.str());
return;
}
}
sysrepo::ErrorCode
NetconfAgent::change(Session sess, const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
// If we're shutting down, or the subscribe-changes or the
// validate-changes flag is not set or the model associated with
// it is not specified.
if (!configuration->getSubscribeChanges() ||
!configuration->getValidateChanges() ||
configuration->getModel().empty()) {
return (sysrepo::ErrorCode::Ok);
}
CfgControlSocketPtr ctrl_sock = configuration->getCfgControlSocket();
if (!ctrl_sock) {
return (sysrepo::ErrorCode::Ok);
}
LOG_INFO(netconf_logger, NETCONF_VALIDATE_CONFIG_STARTED)
.arg(server);
ElementPtr config;
try {
TranslatorConfig tc(sess, configuration->getModel());
config = tc.getConfig();
if (!config) {
ostringstream msg;
msg << "YANG configuration for "
<< configuration->getModel()
<< " is empty";
LOG_ERROR(netconf_logger, NETCONF_VALIDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::OperationFailed);
} else {
LOG_DEBUG(netconf_logger, NETCONF_DBG_TRACE_DETAIL_DATA,
NETCONF_VALIDATE_CONFIG)
.arg(server)
.arg(prettyPrint(config));
}
} catch (exception const& ex) {
ostringstream msg;
msg << "get YANG configuration for " << server
<< " failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_VALIDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
ControlSocketBasePtr comm;
try {
comm = controlSocketFactory(ctrl_sock);
} catch (exception const& ex) {
ostringstream msg;
msg << "createControlSocket failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_VALIDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::Ok);
}
ConstElementPtr answer;
int rcode;
try {
answer = comm->configTest(config, server);
parseAnswer(rcode, answer);
} catch (exception const& ex) {
stringstream msg;
msg << "configTest failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_VALIDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
if (rcode != CONTROL_RESULT_SUCCESS) {
stringstream msg;
msg << "configTest returned " << answerToText(answer);
LOG_ERROR(netconf_logger, NETCONF_VALIDATE_CONFIG_REJECTED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
LOG_INFO(netconf_logger, NETCONF_VALIDATE_CONFIG_COMPLETED)
.arg(server);
return (sysrepo::ErrorCode::Ok);
}
sysrepo::ErrorCode
NetconfAgent::done(Session sess, const CfgServersMapPair& service_pair) {
string const& server(service_pair.first);
CfgServerPtr const& configuration(service_pair.second);
// Check if we should and can process this update.
if (!configuration->getSubscribeChanges() ||
configuration->getModel().empty()) {
return (sysrepo::ErrorCode::Ok);
}
CfgControlSocketPtr ctrl_sock = configuration->getCfgControlSocket();
if (!ctrl_sock) {
return (sysrepo::ErrorCode::Ok);
}
// All looks good, let's get started. Print an info that we're about
// to update the configuration.
LOG_INFO(netconf_logger, NETCONF_UPDATE_CONFIG_STARTED)
.arg(server);
// Retrieve the configuration from SYSREPO first.
ElementPtr config;
try {
TranslatorConfig tc(sess, configuration->getModel());
config = tc.getConfig();
if (!config) {
ostringstream msg;
msg << "YANG configuration for "
<< configuration->getModel()
<< " is empty";
LOG_ERROR(netconf_logger, NETCONF_UPDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
} else {
LOG_DEBUG(netconf_logger, NETCONF_DBG_TRACE_DETAIL_DATA,
NETCONF_UPDATE_CONFIG)
.arg(server)
.arg(prettyPrint(config));
}
} catch (exception const& ex) {
ostringstream msg;
msg << "get YANG configuration for " << server
<< " failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_UPDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
// Ok, now open the control socket. We need this to send the config to
// the server.
ControlSocketBasePtr comm;
try {
comm = controlSocketFactory(ctrl_sock);
} catch (exception const& ex) {
ostringstream msg;
msg << "createControlSocket failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_UPDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::Ok);
}
// Now apply the config using config-set command.
ConstElementPtr answer;
int rcode;
try {
answer = comm->configSet(config, server);
parseAnswer(rcode, answer);
} catch (exception const& ex) {
stringstream msg;
msg << "configSet failed with " << ex.what();
LOG_ERROR(netconf_logger, NETCONF_UPDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
// rcode == CONTROL_RESULT_SUCCESS, unless the docs say otherwise :).
if (rcode != CONTROL_RESULT_SUCCESS) {
stringstream msg;
msg << "configSet returned " << answerToText(answer);
LOG_ERROR(netconf_logger, NETCONF_UPDATE_CONFIG_FAILED)
.arg(server)
.arg(msg.str());
return (sysrepo::ErrorCode::ValidationFailed);
}
LOG_INFO(netconf_logger, NETCONF_UPDATE_CONFIG_COMPLETED)
.arg(server);
return (sysrepo::ErrorCode::Ok);
}
void
NetconfAgent::logChanges(Session sess, string_view const& model) {
ostringstream stream;
stream << "/" << model << ":*//.";
string const xpath(stream.str());
ChangeCollection const changes(sess.getChanges(xpath));
for (Change const& change : changes) {
ostringstream msg;
switch (change.operation) {
case sysrepo::ChangeOperation::Created:
msg << "created: ";
break;
case sysrepo::ChangeOperation::Deleted:
msg << "deleted: ";
break;
case sysrepo::ChangeOperation::Modified:
msg << "modified: ";
break;
case sysrepo::ChangeOperation::Moved:
msg << "moved: ";
break;
default:
msg << "unknown operation (" << change.operation << "): ";
}
string const path(change.node.path());
msg << path;
SchemaNode const& schema(change.node.schema());
NodeType const node_type(schema.nodeType());
if (node_type == NodeType::Container) {
msg << " (container)";
} else if (node_type == NodeType::List) {
msg << " (list)";
} else {
optional<string> const str(
Translator::translateToYang(Translator::translateFromYang(change.node),
LeafBaseType::Unknown));
if (str) {
msg << " = " << *str;
}
}
LOG_DEBUG(netconf_logger, NETCONF_DBG_TRACE_DETAIL_DATA,
NETCONF_CONFIG_CHANGED_DETAIL)
.arg(msg.str());
}
}
void
NetconfAgent::announceShutdown() const {
isc::process::DControllerBasePtr& controller(NetconfController::instance());
if (controller) {
boost::dynamic_pointer_cast<NetconfController>(controller)
->getNetconfProcess()
->setShutdownFlag(true);
}
}
bool NetconfAgent::shouldShutdown() const {
return boost::dynamic_pointer_cast<NetconfController>(NetconfController::instance())
->getNetconfProcess()
->shouldShutdown();
}
} // namespace netconf
} // namespace isc
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