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[5393] Fixed conflict resolution in allocation engine.

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This now works for any identifier, instead of just MAC address.
This commit is contained in:
Marcin Siodelski
2017-10-20 12:10:31 +02:00
parent 024f18bb27
commit e3a6262f47
2 changed files with 94 additions and 16 deletions
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83
src/bin/dhcp4/tests/dora_unittest.cc
View File

@@ -103,6 +103,11 @@ namespace {
/// - Configuration 10:
/// - Simple configuration with a single subnet and single pool
/// - Using Cassandra lease database backend to store leases
///
/// - Configuration 11:
/// - Simple configuration with a single subnet
/// - One in-pool reservation for a circuit-id of 'charter950'
///
const char* DORA_CONFIGS[] = {
// Configuration 0
"{ \"interfaces-config\": {"
@@ -383,7 +388,25 @@ const char* DORA_CONFIGS[] = {
" \"id\": 1,"
" \"pools\": [ { \"pool\": \"10.0.0.10-10.0.0.100\" } ]"
" } ]"
"}",
// Configuration 11
"{ \"interfaces-config\": {"
" \"interfaces\": [ \"*\" ]"
"},"
"\"host-reservation-identifiers\": [ \"circuit-id\" ],"
"\"valid-lifetime\": 600,"
"\"subnet4\": [ { "
" \"subnet\": \"10.0.0.0/24\", "
" \"pools\": [ { \"pool\": \"10.0.0.5-10.0.0.100\" } ],"
" \"reservations\": [ "
" {"
" \"circuit-id\": \"'charter950'\","
" \"ip-address\": \"10.0.0.9\""
" }"
" ]"
"} ]"
"}",
};
/// @brief Test fixture class for testing 4-way (DORA) exchanges.
@@ -1658,6 +1681,66 @@ TEST_F(DORATest, customServerIdentifier) {
EXPECT_EQ("3.4.5.6", client3.config_.serverid_.toText());
}
// This test verifies that reserved lease is not assigned to a client which
// identifier doesn't match the identifier in the reservation.
TEST_F(DORATest, changingCircuitId) {
Dhcp4Client client(Dhcp4Client::SELECTING);
client.setHWAddress("aa:bb:cc:dd:ee:ff");
// Use relay agent so as the circuit-id can be inserted.
client.useRelay(true, IOAddress("10.0.0.1"), IOAddress("10.0.0.2"));
// Configure DHCP server.
configure(DORA_CONFIGS[11], *client.getServer());
// Send DHCPDISCOVER.
boost::shared_ptr<IOAddress> requested_address(new IOAddress("10.0.0.9"));
ASSERT_NO_THROW(client.doDiscover(requested_address));
// Make sure that the server responded.
ASSERT_TRUE(client.getContext().response_);
Pkt4Ptr resp = client.getContext().response_;
// Make sure that the server has responded with DHCPOFFER
ASSERT_EQ(DHCPOFFER, static_cast<int>(resp->getType()));
// Make sure that the client has been offerred a different address
// given that circuit-id is not used.
ASSERT_NE(resp->getYiaddr().toText(), "10.0.0.9");
// Specify circuit-id matching the one in the configuration.
client.setCircuitId("charter950");
// Send DHCPDISCOVER.
ASSERT_NO_THROW(client.doDiscover());
// Make sure that the server responded.
ASSERT_TRUE(client.getContext().response_);
resp = client.getContext().response_;
// Make sure that the server has responded with DHCPOFFER
ASSERT_EQ(DHCPOFFER, static_cast<int>(resp->getType()));
// Make sure that the client has been offerred reserved address given that
// matching circuit-id has been specified.
ASSERT_EQ("10.0.0.9", resp->getYiaddr().toText());
// Let's now change the circuit-id.
client.setCircuitId("gdansk");
// The client requests offerred address but should be refused this address
// given that the circuit-id is not matching.
ASSERT_NO_THROW(client.doRequest());
// Make sure that the server responded.
ASSERT_TRUE(client.getContext().response_);
resp = client.getContext().response_;
// The client should be refused this address.
ASSERT_EQ(DHCPNAK, static_cast<int>(resp->getType()));
// In this case, the client falls back to the 4-way exchange and should be
// allocated an address from the dynamic pool.
ASSERT_NO_THROW(client.doDORA());
// Make sure that the server responded.
ASSERT_TRUE(client.getContext().response_);
resp = client.getContext().response_;
// The client should be allocated some address.
ASSERT_EQ(DHCPACK, static_cast<int>(resp->getType()));
ASSERT_NE(client.config_.lease_.addr_.toText(), "10.0.0.9");
}
// Starting tests which require MySQL backend availability. Those tests
// will not be executed if Kea has been compiled without the
// --with-dhcp-mysql.

25
src/lib/dhcpsrv/alloc_engine.cc
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@@ -2336,9 +2336,10 @@ namespace {
/// @brief Check if the specific address is reserved for another client.
///
/// This function uses the HW address from the context to check if the
/// requested address (specified as first parameter) is reserved for
/// another client, i.e. client using a different HW address.
/// This function finds a host reservation for a given address and then
/// it verifies if the host identifier for this reservation is matching
/// a host identifier found for the current client. If it does not, the
/// address is assumed to be reserved for another client.
///
/// @param address An address for which the function should check if
/// there is a reservation for the different client.
@@ -2349,21 +2350,15 @@ namespace {
bool
addressReserved(const IOAddress& address, const AllocEngine::ClientContext4& ctx) {
ConstHostPtr host = HostMgr::instance().get4(ctx.subnet_->getID(), address);
HWAddrPtr host_hwaddr;
if (host) {
host_hwaddr = host->getHWAddress();
if (ctx.hwaddr_ && host_hwaddr) {
/// @todo Use the equality operators for HWAddr class.
/// Currently, this is impossible because the HostMgr uses the
/// HTYPE_ETHER type, whereas the unit tests may use other types
/// which HostMgr doesn't support yet.
return (host_hwaddr->hwaddr_ != ctx.hwaddr_->hwaddr_);
} else {
return (false);
for (auto id = ctx.host_identifiers_.cbegin(); id != ctx.host_identifiers_.cend();
++id) {
if (id->first == host->getIdentifierType()) {
return (id->second != host->getIdentifier());
}
}
return (true);
}
return (false);
}