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Commit 1afa4e24 authored by Marcin Siodelski's avatar Marcin Siodelski
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[master] Merge branch 'trac3690' 

Conflicts:
	src/lib/dhcpsrv/tests/alloc_engine_unittest.cc
parents 46f2a7b5 6c5a15b0
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src/lib/dhcpsrv/alloc_engine.cc
View file @ 1afa4e24
......@@ -827,7 +827,7 @@ AllocEngine::allocateLease4(const SubnetPtr& subnet, const ClientIdPtr& clientid
/// API which would in turn require lots of changes in unit tests.
/// The ticket introducing a context and host reservation in the
/// allocation engine is complex enough by itself to warrant that
/// the API change is done with a separate ticket.
/// the API change is done with a separate ticket (#3709).
ClientContext4 ctx;
ctx.subnet_ = subnet;
ctx.clientid_ = clientid;
......@@ -918,52 +918,70 @@ AllocEngine::allocateLease4(const SubnetPtr& subnet, const ClientIdPtr& clientid
return (Lease4Ptr());
}
// The reserved address always takes precedence over an address
// supplied by the client (renewed address or requested).
const IOAddress& candidate = ctx.host_ ?
ctx.host_->getIPv4Reservation() : ctx.requested_address_;
// Now let's pick an address to be allocated to the client. The
// candidate address may either be a reserved one or the one that
// the client requests.
IOAddress candidate = 0;
ConstHostPtr other_host;
if (ctx.host_) {
candidate = ctx.host_->getIPv4Reservation();
// Once we picked an address we want to allocate, we have to check
// if this address is available.
existing = LeaseMgrFactory::instance().getLease4(candidate);
if (!existing) {
// The candidate address is currently unused. Let's create a
// lease for it.
Lease4Ptr lease = createLease4(subnet, clientid, hwaddr,
candidate, fwd_dns_update,
rev_dns_update,
hostname, callout_handle,
fake_allocation);
// If we have allocated the lease let's return it. Also,
// always return when tried to allocate reserved address,
// regardless if allocation was successful or not. If it
// was not successful, we will return a NULL pointer which
// indicates to the server that it should send NAK to the
// client.
if (lease || ctx.host_) {
return (lease);
}
// There is a lease for this address in the lease database but
// it is possible that the lease has expired, in which case
// we will be able to reuse it.
} else {
if (existing->expired()) {
// Save the old lease, before reusing it.
old_lease.reset(new Lease4(*existing));
return (reuseExpiredLease(existing, ctx));
// The existing lease is not expired (is in use by some
// other client). If we are trying to get this lease because
// the address has been reserved for the client we have no
// choice but to return a NULL lease to indicate that the
// allocation has failed.
} else if (ctx.host_) {
candidate = ctx.requested_address_;
// If client is requesting an address we have to check if this address
// is not reserved for someone else. Note that for DHCPDISCOVER we
// treat the requested address as a hint and we don't return an empty
// lease.
other_host = HostMgr::instance().get4(ctx.subnet_->getID(), candidate);
if (!ctx.fake_allocation_ && other_host) {
return (Lease4Ptr());
}
}
// If address is not reserved for another client, let's try allocate it.
if (!other_host) {
// Once we picked an address we want to allocate, we have to check
// if this address is available.
existing = LeaseMgrFactory::instance().getLease4(candidate);
if (!existing) {
// The candidate address is currently unused. Let's create a
// lease for it.
Lease4Ptr lease = createLease4(subnet, clientid, hwaddr,
candidate, fwd_dns_update,
rev_dns_update,
hostname, callout_handle,
fake_allocation);
// If we have allocated the lease let's return it. Also,
// always return when tried to allocate reserved address,
// regardless if allocation was successful or not. If it
// was not successful, we will return a NULL pointer which
// indicates to the server that it should send NAK to the
// client.
if (lease || ctx.host_) {
return (lease);
}
// There is a lease for this address in the lease database but
// it is possible that the lease has expired, in which case
// we will be able to reuse it.
} else {
if (existing->expired()) {
// Save the old lease, before reusing it.
old_lease.reset(new Lease4(*existing));
return (reuseExpiredLease(existing, ctx));
// The existing lease is not expired (is in use by some
// other client). If we are trying to get this lease because
// the address has been reserved for the client we have no
// choice but to return a NULL lease to indicate that the
// allocation has failed.
} else if (ctx.host_) {
return (Lease4Ptr());
}
}
}
}
......
src/lib/dhcpsrv/tests/alloc_engine_unittest.cc
View file @ 1afa4e24
......@@ -2780,6 +2780,42 @@ TEST_F(AllocEngine4Test, reservedAddressVsDynamicPool) {
EXPECT_NE(allocated_lease->addr_.toText(), "192.0.2.100");
}
// This test checks that the client requesting an address which is
// reserved for another client will get no lease or a different
// address will be assigned if the client is sending a DHCPDISCOVER.
TEST_F(AllocEngine4Test, reservedAddressHintUsedByOtherClient) {
// Create a reservation for the client.
HostPtr host(new Host(&hwaddr2_->hwaddr_[0], hwaddr_->hwaddr_.size(),
Host::IDENT_HWADDR, subnet_->getID(),
SubnetID(0), IOAddress("192.0.2.100")));
CfgMgr::instance().getStagingCfg()->getCfgHosts()->add(host);
CfgMgr::instance().commit();
AllocEngine engine(AllocEngine::ALLOC_ITERATIVE, 100, false);
// Different client is requesting this address.
Lease4Ptr allocated_lease = engine.allocateLease4(subnet_, ClientIdPtr(),
hwaddr_,
IOAddress("192.0.2.100"),
false, false, "", false,
CalloutHandlePtr(),
old_lease_);
// The client should get no lease (DHCPNAK).
ASSERT_FALSE(allocated_lease);
// The same client should get a different lease than requested if
// if is sending a DHCPDISCOVER (fake allocation is true).
allocated_lease = engine.allocateLease4(subnet_, ClientIdPtr(),
hwaddr_,
IOAddress("192.0.2.100"),
false, false, "", true,
CalloutHandlePtr(),
old_lease_);
ASSERT_TRUE(allocated_lease);
// Make sure the lease obtained is for a different address.
EXPECT_NE(allocated_lease->addr_.toText(), "192.0.2.100");
}
// This test checks that the allocation engine refuses to allocate an
// address when the pool is exhausted, and the only one available
// address is reserved for a different client.
......
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