Commit b30b2961 authored by Thomas Markwalder's avatar Thomas Markwalder
Browse files

[3222] b10-dhcp6 now controls D2ClientMgr

Added D2ClientMgr send mode control and error handler
to Dhcp6vSrv and use of each to ControlledDhcpv6Srv.
Added new unit test files d2_unittest.h and cc.
parent 2da25a59
......@@ -114,6 +114,16 @@ ControlledDhcpv6Srv::dhcp6ConfigHandler(ConstElementPtr new_config) {
return (answer);
// Server will start DDNS communications if its enabled.
try {
} catch (const std::exception& ex) {
std::ostringstream err;
err << "error starting DHCP_DDNS client "
" after server reconfiguration: " << ex.what();
return (isc::config::createAnswer(1, err.str()));
// Configuration may change active interfaces. Therefore, we have to reopen
// sockets according to new configuration. This operation is not exception
// safe and we really don't want to emit exceptions to the callback caller.
......@@ -212,6 +222,10 @@ void ControlledDhcpv6Srv::establishSession() {
try {
// Pull the full configuration out from the session.
configureDhcp6Server(*this, config_session_->getFullConfig());
// Server will start DDNS communications if its enabled.
// Configuration may disable or enable interfaces so we have to
// reopen sockets according to new configuration.
......@@ -544,3 +544,8 @@ recently and does not recognize its well-behaving clients. This is more
probable if you see many such messages. Clients will recover from this,
but they will most likely get a different IP addresses and experience
a brief service interruption.
% DHCP6_DDNS_REQUEST_SEND_FAILED failed sending a request to b10-dhcp-ddns, error : %1, ncr: %2
This error message indicates that IPv6 DHCP server attempted to send a DDNS
update reqeust to the DHCP-DDNS server. This is most likely a configuration or
networking error.
......@@ -2455,5 +2455,29 @@ Dhcpv6Srv::generateFqdn(const Pkt6Ptr& answer) {
Dhcpv6Srv::startD2() {
D2ClientMgr& d2_mgr = CfgMgr::instance().getD2ClientMgr();
if (d2_mgr.ddnsEnabled()) {
// Updates are enabled, so lets start the sender, passing in
// our error handler.
// This may throw so wherever this is called needs to ready.
this, _1, _2));
dhcp_ddns::NameChangeSender::Result result,
dhcp_ddns::NameChangeRequestPtr& ncr) {
arg(result).arg((ncr ? ncr->toText() : " NULL "));
// We cannot communicate with b10-dhcp-ddns, suspend futher updates.
/// @todo We may wish to revisit this, but for now we will simpy turn
/// them off.
......@@ -24,6 +24,7 @@
#include <dhcp/option_definition.h>
#include <dhcp/pkt6.h>
#include <dhcpsrv/alloc_engine.h>
#include <dhcpsrv/d2_client_mgr.h>
#include <dhcpsrv/subnet.h>
#include <hooks/callout_handle.h>
......@@ -117,6 +118,31 @@ public:
/// @param port UDP port on which server should listen.
static void openActiveSockets(const uint16_t port);
/// @brief Starts DHCP_DDNS client IO if DDNS updates are enabled.
/// If updates are enabled, it Instructs the D2ClientMgr singleton to
/// enter send mode. If D2ClientMgr encounters errors it may throw
/// D2ClientErrors. This method does not catch exceptions.
void startD2();
/// @brief Implements the error handler for DHCP_DDNS IO errors
/// Invoked when a NameChangeRequest send to b10-dhcp-ddns completes with
/// a failed status. These are communications errors, not data related
/// failures.
/// This method logs the failure and then suspends all further updates.
/// Updating can only be restored by reconfiguration or restarting the
/// server. There is currently no retry logic so the first IO error that
/// occurs will suspend updates.
/// @todo We may wish to make this more robust or sophisticated.
/// @param result Result code of the send operation.
/// @param ncr NameChangeRequest which failed to send.
virtual void d2ClientErrorHandler(const dhcp_ddns::
NameChangeSender::Result result,
dhcp_ddns::NameChangeRequestPtr& ncr);
/// @brief Compare received server id with our server id
......@@ -75,6 +75,7 @@ dhcp6_unittests_SOURCES +=
dhcp6_unittests_SOURCES += dhcp6_test_utils.h
dhcp6_unittests_SOURCES +=
dhcp6_unittests_SOURCES +=
dhcp6_unittests_SOURCES += d2_unittest.h
dhcp6_unittests_SOURCES +=
dhcp6_unittests_SOURCES += ../dhcp6_srv.h ../
dhcp6_unittests_SOURCES += ../dhcp6_log.h ../
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