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dns_mgr.cc
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/*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <cmn/dns.h>
#include <bind/bind_util.h>
#include <mgr/dns_mgr.h>
#include <mgr/dns_oper.h>
#include <bind/bind_resolver.h>
#include <bind/named_config.h>
#include <agent/agent_xmpp_channel.h>
uint16_t DnsManager::g_trans_id_;
DnsManager::DnsManager()
: bind_status_(boost::bind(&DnsManager::BindEventHandler, this, _1)),
pending_done_queue_(TaskScheduler::GetInstance()->GetTaskId("dns::Config"), 0,
boost::bind(&DnsManager::PendingDone, this, _1)) {
std::vector<BindResolver::DnsServer> bind_servers;
bind_servers.push_back(BindResolver::DnsServer("127.0.0.1",
Dns::GetDnsPort()));
BindResolver::Init(*Dns::GetEventManager()->io_service(), bind_servers,
boost::bind(&DnsManager::HandleUpdateResponse,
this, _1));
Dns::SetDnsConfigManager(&config_mgr_);
DnsConfigManager::Observers obs;
obs.virtual_dns = boost::bind(&DnsManager::ProcessConfig<VirtualDnsConfig>,
this, _1, _2, _3);
obs.virtual_dns_record =
boost::bind(&DnsManager::ProcessConfig<VirtualDnsRecordConfig>,
this, _1, _2, _3);
obs.ipam = boost::bind(&DnsManager::ProcessConfig<IpamConfig>, this, _1, _2, _3);
obs.vnni = boost::bind(&DnsManager::ProcessConfig<VnniConfig>, this, _1, _2, _3);
Dns::GetDnsConfigManager()->RegisterObservers(obs);
DnsConfig::VdnsCallback = boost::bind(&DnsManager::DnsView, this, _1, _2);
DnsConfig::VdnsRecordCallback = boost::bind(&DnsManager::DnsRecord, this,
_1, _2);
DnsConfig::VdnsZoneCallback = boost::bind(&DnsManager::DnsPtrZone, this,
_1, _2, _3);
pending_timer_ =
TimerManager::CreateTimer(*Dns::GetEventManager()->io_service(),
"DnsRetransmitTimer",
TaskScheduler::GetInstance()->GetTaskId("dns::Config"), 0);
StartPendingTimer();
}
void DnsManager::Initialize(DB *config_db, DBGraph *config_graph,
const std::string& named_config_dir,
const std::string& named_config_file,
const std::string& named_log_file,
const std::string& rndc_config_file,
const std::string& rndc_secret,
const std::string& named_max_cache_size) {
NamedConfig::Init(named_config_dir, named_config_file,
named_log_file, rndc_config_file, rndc_secret,
named_max_cache_size);
// bind_status_.SetTrigger();
config_mgr_.Initialize(config_db, config_graph);
}
DnsManager::~DnsManager() {
pending_timer_->Cancel();
TimerManager::DeleteTimer(pending_timer_);
pending_done_queue_.Shutdown();
}
void DnsManager::Shutdown() {
config_mgr_.Terminate();
NamedConfig::Shutdown();
BindResolver::Shutdown();
}
template <typename ConfigType>
void DnsManager::ProcessConfig(IFMapNodeProxy *proxy,
const std::string &name,
DnsConfigManager::EventType event) {
IFMapNode *node = proxy->node();
ConfigType *config = ConfigType::Find(name);
switch (event) {
case DnsConfigManager::CFG_ADD:
if (!config) {
config = new ConfigType(node);
}
config->OnAdd(node);
break;
case DnsConfigManager::CFG_CHANGE:
if (config)
config->OnChange(node);
break;
case DnsConfigManager::CFG_DELETE:
if (config) {
config->OnDelete();
delete config;
}
break;
default:
assert(0);
}
}
void DnsManager::ProcessAgentUpdate(BindUtil::Operation event,
const std::string &name,
const std::string &vdns_name,
const DnsItem &item) {
tbb::mutex::scoped_lock lock(mutex_);
VirtualDnsRecordConfig *config = VirtualDnsRecordConfig::Find(name);
switch (event) {
case BindUtil::ADD_UPDATE:
if (!config) {
config = new VirtualDnsRecordConfig(name, vdns_name, item);
}
config->OnAdd();
break;
case BindUtil::CHANGE_UPDATE:
if (config)
config->OnChange(item);
break;
case BindUtil::DELETE_UPDATE:
if (config) {
config->OnDelete();
delete config;
}
break;
default:
assert(0);
}
}
void DnsManager::DnsView(const DnsConfig *cfg, DnsConfig::DnsConfigEvent ev) {
if (!bind_status_.IsUp())
return;
const VirtualDnsConfig *config = static_cast<const VirtualDnsConfig *>(cfg);
DNS_BIND_TRACE(DnsBindTrace, "Virtual DNS <" << config->GetName() <<
"> " << DnsConfig::ToEventString(ev));
config->ClearNotified();
std::string dns_domain = config->GetDomainName();
if (dns_domain.empty()) {
DNS_BIND_TRACE(DnsBindTrace, "Virtual DNS <" << config->GetName() <<
"> doesnt have domain; ignoring event : " <<
DnsConfig::ToEventString(ev));
return;
}
NamedConfig *ncfg = NamedConfig::GetNamedConfigObject();
if (ev == DnsConfig::CFG_ADD) {
if (!CheckName(config->GetName(), dns_domain)) {
return;
}
config->MarkNotified();
ncfg->AddView(config);
} else if (ev == DnsConfig::CFG_CHANGE) {
if (CheckName(config->GetName(), dns_domain)) {
config->MarkNotified();
}
ncfg->ChangeView(config);
if (dns_domain != config->GetOldDomainName()) {
NotifyAllDnsRecords(config, ev);
} else if (config->HasReverseResolutionChanged()) {
bool reverse_resolution = config->IsReverseResolutionEnabled();
// if reverse resolution is enabled now, add the reverse records
// if reverse resolution is disabled now, mark them as not notified
NotifyReverseDnsRecords(config, ev, reverse_resolution);
}
} else {
ncfg->DelView(config);
PendingListViewDelete(config);
}
}
void DnsManager::DnsPtrZone(const Subnet &subnet, const VirtualDnsConfig *vdns,
DnsConfig::DnsConfigEvent ev) {
if (!bind_status_.IsUp())
return;
std::string dns_domain = vdns->GetDomainName();
if (dns_domain.empty()) {
DNS_BIND_TRACE(DnsBindTrace, "Ptr Zone <" << vdns->GetName() <<
"> ; ignoring event: " << DnsConfig::ToEventString(ev) <<
" Domain: " << dns_domain << " Reverse Resolution: " <<
(vdns->IsReverseResolutionEnabled()? "enabled" :
"disabled"));
return;
}
NamedConfig *ncfg = NamedConfig::GetNamedConfigObject();
if (ev == DnsConfig::CFG_DELETE) {
ncfg->DelZone(subnet, vdns);
PendingListZoneDelete(subnet, vdns);
} else {
ncfg->AddZone(subnet, vdns);
}
DNS_BIND_TRACE(DnsBindTrace, "Virtual DNS <" << vdns->GetName() << "> " <<
subnet.prefix.to_string() << "/" << subnet.plen << " " <<
DnsConfig::ToEventString(ev));
}
void DnsManager::DnsRecord(const DnsConfig *cfg, DnsConfig::DnsConfigEvent ev) {
if (!bind_status_.IsUp())
return;
const VirtualDnsRecordConfig *config =
static_cast<const VirtualDnsRecordConfig *>(cfg);
config->ClearNotified();
const DnsItem &item = config->GetRecord();
if (item.name == "" || item.data == "") {
DNS_BIND_TRACE(DnsBindError, "Virtual DNS Record <" <<
config->GetName() <<
"> doesnt have name / data; ignoring event : " <<
DnsConfig::ToEventString(ev));
return;
}
if (config->GetViewName() == "" || !config->GetVirtualDns()->IsValid()) {
return;
}
switch (ev) {
case DnsConfig::CFG_ADD:
case DnsConfig::CFG_CHANGE:
if (SendRecordUpdate(BindUtil::ADD_UPDATE, config))
config->MarkNotified();
break;
case DnsConfig::CFG_DELETE:
if (SendRecordUpdate(BindUtil::DELETE_UPDATE, config))
config->ClearNotified();
break;
default:
assert(0);
}
}
bool DnsManager::SendRecordUpdate(BindUtil::Operation op,
const VirtualDnsRecordConfig *config) {
DnsItem item = config->GetRecord();
const autogen::VirtualDnsType vdns = config->GetVDns();
std::string zone;
if (item.type == DNS_PTR_RECORD) {
if (!vdns.reverse_resolution) {
DNS_BIND_TRACE(DnsBindTrace, "Virtual DNS Record <" <<
config->GetName() << "> PTR name " << item.name <<
" not added - reverse resolution is not enabled");
return false;
}
uint32_t addr;
if (BindUtil::IsIPv4(item.name, addr)) {
BindUtil::GetReverseZone(addr, 32, item.name);
} else {
if (!BindUtil::GetAddrFromPtrName(item.name, addr)) {
DNS_BIND_TRACE(DnsBindError, "Virtual DNS Record <" <<
config->GetName() << "> invalid PTR name " <<
item.name << "; ignoring");
return false;
}
}
if (!CheckName(config->GetName(), item.data)) {
return false;
}
Subnet net;
if (!config->GetVirtualDns()->GetSubnet(addr, net)) {
DNS_BIND_TRACE(DnsBindError, "Virtual DNS Record <" <<
config->GetName() <<
"> doesnt belong to a known subnet; ignoring");
return false;
}
BindUtil::GetReverseZone(addr, net.plen, zone);
item.data = BindUtil::GetFQDN(item.data, vdns.domain_name, ".");
} else {
// Bind allows special chars in CNAME, NS names and in CNAME data
if ((item.type == DNS_A_RECORD || item.type == DNS_AAAA_RECORD) &&
!CheckName(config->GetName(), item.name)) {
return false;
}
zone = config->GetVDns().domain_name;
item.name = BindUtil::GetFQDN(item.name,
vdns.domain_name, vdns.domain_name);
if (item.type == DNS_CNAME_RECORD || item.type == DNS_MX_RECORD)
item.data = BindUtil::GetFQDN(item.data, vdns.domain_name, ".");
// In case of NS record, ensure that there are no special characters in data.
// When it is virtual dns name, we could have chars like ':'
if (item.type == DNS_NS_RECORD)
BindUtil::RemoveSpecialChars(item.data);
}
DnsItems items;
items.push_back(item);
std::string view_name = config->GetViewName();
SendUpdate(op, view_name, zone, items);
return true;
}
void DnsManager::SendUpdate(BindUtil::Operation op, const std::string &view,
const std::string &zone, DnsItems &items) {
uint8_t *pkt = new uint8_t[BindResolver::max_pkt_size];
uint16_t xid = GetTransId();
int len = BindUtil::BuildDnsUpdate(pkt, op, xid, view, zone, items);
if (BindResolver::Resolver()->DnsSend(pkt, 0, len)) {
DNS_BIND_TRACE(DnsBindTrace, "DNS Update sent for DNS record; xid = " <<
xid << "; View = " << view << "; Zone = " << zone << "; " <<
DnsItemsToString(items));
AddPendingList(xid, view, zone, items, op);
}
}
void DnsManager::SendRetransmit(uint16_t xid, BindUtil::Operation op,
const std::string &view,
const std::string &zone, DnsItems &items) {
uint8_t *pkt = new uint8_t[BindResolver::max_pkt_size];
int len = BindUtil::BuildDnsUpdate(pkt, op, xid, view, zone, items);
if (BindResolver::Resolver()->DnsSend(pkt, 0, len)) {
DNS_BIND_TRACE(DnsBindTrace, "DNS retransmit sent for DNS record; xid = " <<
xid << "; View = " << view << "; Zone = " << zone << "; " <<
DnsItemsToString(items));
}
}
void DnsManager::UpdateAll() {
VirtualDnsConfig::DataMap vmap = VirtualDnsConfig::GetVirtualDnsMap();
for (VirtualDnsConfig::DataMap::iterator it = vmap.begin();
it != vmap.end(); ++it) {
VirtualDnsConfig *vdns = it->second;
if (!vdns->GetDomainName().empty() &&
CheckName(vdns->GetName(), vdns->GetDomainName())) {
vdns->MarkNotified();
DNS_BIND_TRACE(DnsBindTrace, "Virtual DNS <" << vdns->GetName() <<
"> Add");
} else {
vdns->ClearNotified();
}
}
NamedConfig *ncfg = NamedConfig::GetNamedConfigObject();
ncfg->AddAllViews();
for (VirtualDnsConfig::DataMap::iterator it = vmap.begin();
it != vmap.end(); ++it) {
VirtualDnsConfig *vdns = it->second;
if (!vdns->IsNotified())
continue;
NotifyAllDnsRecords(vdns, DnsConfig::CFG_ADD);
}
}
void DnsManager::HandleUpdateResponse(uint8_t *pkt) {
dns_flags flags;
uint16_t xid;
DnsItems ques, ans, auth, add;
if (BindUtil::ParseDnsResponse(pkt, xid, flags, ques, ans, auth, add)) {
if (flags.ret) {
DNS_BIND_TRACE(DnsBindError, "Update failed : " <<
BindUtil::DnsResponseCode(flags.ret) <<
"; xid = " << xid);
// ResendRecord(xid);
} else {
DNS_BIND_TRACE(DnsBindTrace, "Update successful; xid = " << xid);
pending_done_queue_.Enqueue(xid);
}
}
delete [] pkt;
}
bool DnsManager::PendingDone(uint16_t xid) {
DeletePendingList(xid);
return true;
}
void DnsManager::ResendAllRecords() {
for (PendingListMap::iterator it = pending_map_.begin();
it != pending_map_.end(); ) {
SendRetransmit(it->first, it->second.op, it->second.view,
it->second.zone, it->second.items);
it->second.retransmit_count++;
if (it->second.retransmit_count > kMaxRetransmitCount) {
DNS_BIND_TRACE(DnsBindTrace, "DNS records max retransmits reached;"
<< "no more retransmission; xid = " << it->first);
pending_map_.erase(it++);
} else {
it++;
}
}
}
void DnsManager::AddPendingList(uint16_t xid, const std::string &view,
const std::string &zone, const DnsItems &items,
BindUtil::Operation op) {
// delete earlier entries for the same items
UpdatePendingList(view, zone, items);
PendingListMap::iterator it = pending_map_.find(xid);
if (it != pending_map_.end()) {
it->second.view = view;
it->second.zone = zone;
it->second.items = items;
it->second.op = op;
it->second.retransmit_count = 0;
return;
}
pending_map_.insert(PendingListPair(xid, PendingList(xid, view, zone,
items, op)));
}
// if there is an update for an item which is already in pending list,
// remove it from the pending list
void DnsManager::UpdatePendingList(const std::string &view,
const std::string &zone,
const DnsItems &items) {
for (PendingListMap::iterator it = pending_map_.begin();
it != pending_map_.end(); ) {
if (it->second.view == view &&
it->second.zone == zone &&
it->second.items == items)
pending_map_.erase(it++);
else
it++;
}
}
void DnsManager::DeletePendingList(uint16_t xid) {
pending_map_.erase(xid);
}
void DnsManager::ClearPendingList() {
pending_map_.clear();
}
// Remove entries from pending list, upon a view delete
void DnsManager::PendingListViewDelete(const VirtualDnsConfig *config) {
for (PendingListMap::iterator it = pending_map_.begin();
it != pending_map_.end(); ) {
if (it->second.view == config->GetViewName())
pending_map_.erase(it++);
else
it++;
}
}
bool DnsManager::CheckZoneDelete(ZoneList &zones, PendingList &pend) {
for (uint32_t i = 0; i < zones.size(); i++) {
if (zones[i] == pend.zone)
return true;
}
return false;
}
// Remove entries from pending list, upon a zone delete
void DnsManager::PendingListZoneDelete(const Subnet &subnet,
const VirtualDnsConfig *config) {
ZoneList zones;
BindUtil::GetReverseZones(subnet, zones);
for (PendingListMap::iterator it = pending_map_.begin();
it != pending_map_.end(); ) {
if (it->second.view == config->GetViewName() &&
CheckZoneDelete(zones, it->second))
pending_map_.erase(it++);
else
it++;
}
}
void DnsManager::StartPendingTimer() {
if (!pending_timer_->running()) {
pending_timer_->Start(kPendingRecordRetransmitTime,
boost::bind(&DnsManager::PendingTimerExpiry, this));
}
}
void DnsManager::CancelPendingTimer() {
pending_timer_->Cancel();
}
bool DnsManager::PendingTimerExpiry() {
// TODO: change timer to be per record & resend only on individual timeout
ResendAllRecords();
return true;
}
void DnsManager::NotifyAllDnsRecords(const VirtualDnsConfig *config,
DnsConfig::DnsConfigEvent ev) {
for (VirtualDnsConfig::VDnsRec::const_iterator it =
config->virtual_dns_records_.begin();
it != config->virtual_dns_records_.end(); ++it) {
if ((*it)->IsValid())
DnsRecord(*it, ev);
}
}
void DnsManager::NotifyReverseDnsRecords(const VirtualDnsConfig *config,
DnsConfig::DnsConfigEvent ev,
bool notify) {
for (VirtualDnsConfig::VDnsRec::const_iterator it =
config->virtual_dns_records_.begin();
it != config->virtual_dns_records_.end(); ++it) {
DnsItem item = (*it)->GetRecord();
if (item.type == DNS_PTR_RECORD) {
(*it)->ClearNotified();
if ((*it)->IsValid() && notify) {
DnsRecord(*it, ev);
}
}
}
}
inline uint16_t DnsManager::GetTransId() {
return (++g_trans_id_ == 0 ? ++g_trans_id_ : g_trans_id_);
}
inline bool DnsManager::CheckName(std::string rec_name, std::string name) {
if (BindUtil::HasSpecialChars(name)) {
DNS_CONFIGURATION_LOG(
g_vns_constants.CategoryNames.find(Category::DNSAGENT)->second,
SandeshLevel::SYS_ERR,
"Invalid DNS Name - cannot use special characters in DNS name",
rec_name, name);
return false;
}
return true;
}
void DnsManager::BindEventHandler(BindStatus::Event event) {
switch (event) {
case BindStatus::Up: {
DNS_OPERATIONAL_LOG(
g_vns_constants.CategoryNames.find(Category::DNSAGENT)->second,
SandeshLevel::SYS_NOTICE, "BIND named up; DNS is operational");
UpdateAll();
break;
}
case BindStatus::Down: {
DNS_OPERATIONAL_LOG(
g_vns_constants.CategoryNames.find(Category::DNSAGENT)->second,
SandeshLevel::SYS_NOTICE, "BIND named down; DNS is not operational");
NamedConfig *ncfg = NamedConfig::GetNamedConfigObject();
ncfg->Reset();
ClearPendingList();
break;
}
default:
assert(0);
}
}
void ShowDnsConfig::HandleRequest() const {
DnsConfigResponse *resp = new DnsConfigResponse();
resp->set_context(context());
VirtualDnsConfig::DataMap vdns = VirtualDnsConfig::GetVirtualDnsMap();
std::vector<VirtualDnsSandesh> vdns_list_sandesh;
for (VirtualDnsConfig::DataMap::iterator vdns_it = vdns.begin();
vdns_it != vdns.end(); ++vdns_it) {
VirtualDnsConfig *vdns_config = vdns_it->second;
VirtualDnsSandesh vdns_sandesh;
VirtualDnsTraceData vdns_trace_data;
vdns_config->VirtualDnsTrace(vdns_trace_data);
std::vector<VirtualDnsRecordTraceData> rec_list_sandesh;
for (VirtualDnsConfig::VDnsRec::iterator rec_it =
vdns_config->virtual_dns_records_.begin();
rec_it != vdns_config->virtual_dns_records_.end(); ++rec_it) {
VirtualDnsRecordTraceData rec_trace_data;
(*rec_it)->VirtualDnsRecordTrace(rec_trace_data);
rec_list_sandesh.push_back(rec_trace_data);
}
std::vector<std::string> net_list_sandesh;
for (VirtualDnsConfig::IpamList::iterator ipam_iter =
vdns_config->ipams_.begin();
ipam_iter != vdns_config->ipams_.end(); ++ipam_iter) {
IpamConfig *ipam = *ipam_iter;
const IpamConfig::VnniList &vnni = ipam->GetVnniList();
for (IpamConfig::VnniList::iterator vnni_it = vnni.begin();
vnni_it != vnni.end(); ++vnni_it) {
Subnets &subnets = (*vnni_it)->GetSubnets();
for (unsigned int i = 0; i < subnets.size(); i++) {
std::stringstream str;
str << subnets[i].prefix.to_string();
str << "/";
str << subnets[i].plen;
net_list_sandesh.push_back(str.str());
}
}
}
vdns_sandesh.set_virtual_dns(vdns_trace_data);
vdns_sandesh.set_records(rec_list_sandesh);
vdns_sandesh.set_subnets(net_list_sandesh);
vdns_list_sandesh.push_back(vdns_sandesh);
}
resp->set_virtual_dns(vdns_list_sandesh);
resp->Response();
}
void ShowVirtualDnsServers::HandleRequest() const {
VirtualDnsServersResponse *resp = new VirtualDnsServersResponse();
resp->set_context(context());
VirtualDnsConfig::DataMap vdns = VirtualDnsConfig::GetVirtualDnsMap();
std::vector<VirtualDnsServersSandesh> vdns_list_sandesh;
for (VirtualDnsConfig::DataMap::iterator vdns_it = vdns.begin();
vdns_it != vdns.end(); ++vdns_it) {
VirtualDnsConfig *vdns_config = vdns_it->second;
VirtualDnsServersSandesh vdns_sandesh;
VirtualDnsTraceData vdns_trace_data;
vdns_config->VirtualDnsTrace(vdns_trace_data);
std::vector<std::string> net_list_sandesh;
for (VirtualDnsConfig::IpamList::iterator ipam_iter =
vdns_config->ipams_.begin();
ipam_iter != vdns_config->ipams_.end(); ++ipam_iter) {
IpamConfig *ipam = *ipam_iter;
const IpamConfig::VnniList &vnni = ipam->GetVnniList();
for (IpamConfig::VnniList::iterator vnni_it = vnni.begin();
vnni_it != vnni.end(); ++vnni_it) {
Subnets &subnets = (*vnni_it)->GetSubnets();
for (unsigned int i = 0; i < subnets.size(); i++) {
std::stringstream str;
str << subnets[i].prefix.to_string();
str << "/";
str << subnets[i].plen;
net_list_sandesh.push_back(str.str());
}
}
}
vdns_sandesh.set_virtual_dns(vdns_trace_data);
vdns_sandesh.set_records(vdns_config->GetName());
vdns_sandesh.set_num_records(vdns_config->virtual_dns_records_.size());
vdns_sandesh.set_subnets(net_list_sandesh);
vdns_list_sandesh.push_back(vdns_sandesh);
}
resp->set_virtual_dns_servers(vdns_list_sandesh);
resp->Response();
}
void ShowVirtualDnsRecords::HandleRequest() const {
VirtualDnsRecordsResponse *resp = new VirtualDnsRecordsResponse();
VirtualDnsConfig::DataMap vdns = VirtualDnsConfig::GetVirtualDnsMap();
std::stringstream ss(get_virtual_dns_server());
std::string vdns_server, next_iterator;
VirtualDnsRecordConfig *next_iterator_key = NULL;
std::getline(ss, vdns_server, '@');
std::getline(ss, next_iterator);
if (!next_iterator.empty()) {
std::stringstream next_iter(next_iterator);
uint64_t value = 0;
next_iter >> value;
next_iterator_key = (VirtualDnsRecordConfig *) value;
}
std::vector<VirtualDnsRecordTraceData> rec_list_sandesh;
VirtualDnsConfig::DataMap::iterator vdns_it = vdns.find(vdns_server);
if (vdns_it != vdns.end()) {
VirtualDnsConfig *vdns_config = vdns_it->second;
int count = 0;
for (VirtualDnsConfig::VDnsRec::iterator rec_it =
vdns_config->virtual_dns_records_.lower_bound(next_iterator_key);
rec_it != vdns_config->virtual_dns_records_.end(); ++rec_it) {
VirtualDnsRecordTraceData rec_trace_data;
(*rec_it)->VirtualDnsRecordTrace(rec_trace_data);
rec_list_sandesh.push_back(rec_trace_data);
if (++count == DnsManager::max_records_per_sandesh) {
if (++rec_it == vdns_config->virtual_dns_records_.end())
break;
std::stringstream str;
uint64_t value = (uint64_t)(*rec_it);
str << vdns_server << "@" << value;
resp->set_getnext_record_set(str.str());
break;
}
}
}
resp->set_context(context());
resp->set_virtual_dns_server(vdns_server);
resp->set_records(rec_list_sandesh);
resp->Response();
}