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[3234] Subnet-id is now set properly in b10-dhcp{4,6} servers

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This commit is contained in:
Tomek Mrugalski 2013-12-30 18:38:37 +01:00
parent 7715d34151
commit 09cfa792bf
7 changed files with 156 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
7XX. [bug] tomek
b10-dhcp4,b10-dhcp6: Both servers used to unnecessarily increase
subnet-id values after reconfiguration. The subnet-ids are now reset
to 1 every time a server is reconfigured.
(Trac #3234, git abcd)
720. [func] tmark
Added the initial implementation of the class, NameAddTransaction,
to b10-dhcp-ddns. This class provides a state machine which implements

4
src/bin/dhcp4/config_parser.cc
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@ -433,6 +433,10 @@ configureDhcp4Server(Dhcpv4Srv&, isc::data::ConstElementPtr config_set) {
LOG_DEBUG(dhcp4_logger, DBG_DHCP4_COMMAND,
DHCP4_CONFIG_START).arg(config_set->str());
// Before starting any subnet operations, let's reset the subnet-id counter,
// so newly recreated configuration starts with first subnet-id equal 1.
Subnet::resetSubnetID();
// Some of the values specified in the configuration depend on
// other values. Typically, the values in the subnet4 structure
// depend on the global values. Also, option values configuration

64
src/bin/dhcp4/tests/config_parser_unittest.cc
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@ -410,8 +410,72 @@ TEST_F(Dhcp4ParserTest, subnetGlobalDefaults) {
EXPECT_EQ(1000, subnet->getT1());
EXPECT_EQ(2000, subnet->getT2());
EXPECT_EQ(4000, subnet->getValid());
// Check that subnet-id is 1
EXPECT_EQ(1, subnet->getID());
}
// Goal of this test is to verify that multiple subnets get unique
// subnet-ids. Also, test checks that it's possible to do reconfiguration
// multiple times.
TEST_F(Dhcp4ParserTest, multipleSubnets) {
ConstElementPtr x;
string config = "{ \"interfaces\": [ \"*\" ],"
"\"rebind-timer\": 2000, "
"\"renew-timer\": 1000, "
"\"subnet4\": [ { "
" \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
" \"subnet\": \"192.0.2.0/24\" "
" },"
" {"
" \"pool\": [ \"192.0.3.101 - 192.0.3.150\" ],"
" \"subnet\": \"192.0.3.0/24\" "
" },"
" {"
" \"pool\": [ \"192.0.4.101 - 192.0.4.150\" ],"
" \"subnet\": \"192.0.4.0/24\" "
" },"
" {"
" \"pool\": [ \"192.0.5.101 - 192.0.5.150\" ],"
" \"subnet\": \"192.0.5.0/24\" "
" } ],"
"\"valid-lifetime\": 4000 }";
ElementPtr json = Element::fromJSON(config);
EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
ASSERT_TRUE(x);
comment_ = parseAnswer(rcode_, x);
ASSERT_EQ(0, rcode_);
int cnt = 0; // Number of reconfigurations
do {
ElementPtr json = Element::fromJSON(config);
EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
ASSERT_TRUE(x);
comment_ = parseAnswer(rcode_, x);
ASSERT_EQ(0, rcode_);
const Subnet4Collection* subnets = CfgMgr::instance().getSubnets4();
ASSERT_TRUE(subnets);
ASSERT_EQ(4, subnets->size()); // We expect 4 subnets
// Check subnet-ids of each subnet (it should be monotonously increasing)
EXPECT_EQ(1, subnets->at(0)->getID());
EXPECT_EQ(2, subnets->at(1)->getID());
EXPECT_EQ(3, subnets->at(2)->getID());
EXPECT_EQ(4, subnets->at(3)->getID());
// Repeat reconfiguration process 10 times and check that the subnet-id
// is set to the same value. Technically, just two iterations would be
// sufficient, but it's nice to have a test that exercises reconfiguration
// a bit.
} while (++cnt < 10);
}
// Checks if the next-server defined as global parameter is taken into
// consideration.
TEST_F(Dhcp4ParserTest, nextServerGlobal) {

4
src/bin/dhcp6/config_parser.cc
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@ -646,6 +646,10 @@ configureDhcp6Server(Dhcpv6Srv&, isc::data::ConstElementPtr config_set) {
LOG_DEBUG(dhcp6_logger, DBG_DHCP6_COMMAND,
DHCP6_CONFIG_START).arg(config_set->str());
// Before starting any subnet operations, let's reset the subnet-id counter,
// so newly recreated configuration starts with first subnet-id equal 1.
Subnet::resetSubnetID();
// Some of the values specified in the configuration depend on
// other values. Typically, the values in the subnet6 structure
// depend on the global values. Also, option values configuration

57
src/bin/dhcp6/tests/config_parser_unittest.cc
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@ -436,6 +436,63 @@ TEST_F(Dhcp6ParserTest, subnetGlobalDefaults) {
EXPECT_EQ(2000, subnet->getT2());
EXPECT_EQ(3000, subnet->getPreferred());
EXPECT_EQ(4000, subnet->getValid());
// Check that subnet-id is 1
EXPECT_EQ(1, subnet->getID());
}
// Goal of this test is to verify that multiple subnets get unique
// subnet-ids. Also, test checks that it's possible to do reconfiguration
// multiple times.
TEST_F(Dhcp6ParserTest, multipleSubnets) {
ConstElementPtr x;
string config = "{ \"interfaces\": [ \"*\" ],"
"\"preferred-lifetime\": 3000,"
"\"rebind-timer\": 2000, "
"\"renew-timer\": 1000, "
"\"subnet6\": [ { "
" \"pool\": [ \"2001:db8:1::/80\" ],"
" \"subnet\": \"2001:db8:1::/64\" "
" },"
" {"
" \"pool\": [ \"2001:db8:2::/80\" ],"
" \"subnet\": \"2001:db8:2::/64\" "
" },"
" {"
" \"pool\": [ \"2001:db8:3::/80\" ],"
" \"subnet\": \"2001:db8:3::/64\" "
" },"
" {"
" \"pool\": [ \"2001:db8:4::/80\" ],"
" \"subnet\": \"2001:db8:4::/64\" "
" } ],"
"\"valid-lifetime\": 4000 }";
int cnt = 0; // Number of reconfigurations
do {
ElementPtr json = Element::fromJSON(config);
EXPECT_NO_THROW(x = configureDhcp6Server(srv_, json));
ASSERT_TRUE(x);
comment_ = parseAnswer(rcode_, x);
ASSERT_EQ(0, rcode_);
const Subnet6Collection* subnets = CfgMgr::instance().getSubnets6();
ASSERT_TRUE(subnets);
ASSERT_EQ(4, subnets->size()); // We expect 4 subnets
// Check subnet-ids of each subnet (it should be monotonously increasing)
EXPECT_EQ(1, subnets->at(0)->getID());
EXPECT_EQ(2, subnets->at(1)->getID());
EXPECT_EQ(3, subnets->at(2)->getID());
EXPECT_EQ(4, subnets->at(3)->getID());
// Repeat reconfiguration process 10 times and check that the subnet-id
// is set to the same value. Technically, just two iterations would be
// sufficient, but it's nice to have a test that exercises reconfiguration
// a bit.
} while (++cnt < 10);
}
// This test checks if it is possible to override global values

3
src/lib/dhcpsrv/subnet.cc
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@ -24,6 +24,9 @@ using namespace isc::asiolink;
namespace isc {
namespace dhcp {
// This is an initial value of subnet-id. See comments in subnet.h for details.
SubnetID Subnet::static_id_ = 1;
Subnet::Subnet(const isc::asiolink::IOAddress& prefix, uint8_t len,
const Triplet<uint32_t>& t1,
const Triplet<uint32_t>& t2,

20
src/lib/dhcpsrv/subnet.h
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@ -366,6 +366,15 @@ public:
/// @return textual representation
virtual std::string toText() const;
/// @brief Resets subnet-id counter to its initial value (1)
///
/// This should be called during reconfiguration, before any new
/// subnet objects are created. It will ensure that the subnet_id will
/// be consistent between reconfigures.
static void resetSubnetID() {
static_id_ = 1;
}
protected:
/// @brief Returns all pools (non-const variant)
///
@ -390,12 +399,19 @@ protected:
/// derive from this class.
virtual ~Subnet() { };
/// @brief keeps the subnet-id value
///
/// It is inreased every time a new Subnet object is created.
/// It is reset (@ref resetSubnetId) every time reconfiguration occurs.
///
/// Static value initialized in subnet.cc.
static SubnetID static_id_;
/// @brief returns the next unique Subnet-ID
///
/// @return the next unique Subnet-ID
static SubnetID getNextID() {
static SubnetID id = 0;
return (id++);
return (static_id_++);
}
/// @brief Checks if used pool type is valid