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[github23] Corrected setting port number for DHCPv4 server.

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For the DHCPINFORM case set destination port 68 if:
- direct message sent without ciaddr,
- ciaddr present

Also updated unit test to verify port number for the directly
sent DHCPINFORM without ciaddr.
This commit is contained in:
Marcin Siodelski 2016-07-25 19:35:12 +02:00
parent bdf81033b6
commit 4216a4bedf
3 changed files with 19 additions and 5 deletions
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20
src/bin/dhcp4/dhcp4_srv.cc
View File

@ -1776,15 +1776,25 @@ Dhcpv4Srv::adjustIfaceData(Dhcpv4Exchange& ex) {
Pkt4Ptr query = ex.getQuery();
Pkt4Ptr response = ex.getResponse();
// For the non-relayed message, the destination port is the client's port.
// For the relayed message, the server/relay port is a destination unless
// the message is DHCPINFORM.
// The DHCPINFORM is generally unicast to the client. The only situation
// when the server is unable to unicast to the client is when the client
// doesn't include ciaddr and the message is relayed. In this case the
// server has to reply via relay agent. For other messages we send back
// through relay if message is relayed, and unicast to the client if the
// message is not relayed.
// Note that the call to this function may throw if invalid combination
// of hops and giaddr is found (hops = 0 if giaddr = 0 and hops != 0 if
// giaddr != 0). The exception will propagate down and eventually cause the
// packet to be discarded.
const bool server_port = query->isRelayed() && ((query->getType() == DHCPINFORM) ? query->getCiaddr().isV4Zero() : true);
response->setRemotePort(server_port ? DHCP4_SERVER_PORT : DHCP4_CLIENT_PORT);
if (((query->getType() == DHCPINFORM) &&
((!query->getCiaddr().isV4Zero()) ||
(!query->isRelayed() && !query->getRemoteAddr().isV4Zero()))) ||
((query->getType() != DHCPINFORM) && !query->isRelayed())) {
response->setRemotePort(DHCP4_CLIENT_PORT);
} else {
response->setRemotePort(DHCP4_SERVER_PORT);
}
IOAddress local_addr = query->getLocalAddr();

2
src/bin/dhcp4/tests/dhcp4_client.cc
View File

@ -467,6 +467,8 @@ Dhcp4Client::receiveOneMsg() {
msg->getBuffer().getLength()));
msg_copy->setRemoteAddr(msg->getLocalAddr());
msg_copy->setLocalAddr(msg->getRemoteAddr());
msg_copy->setRemotePort(msg->getLocalPort());
msg_copy->setLocalPort(msg->getRemotePort());
msg_copy->setIface(msg->getIface());
msg_copy->unpack();

2
src/bin/dhcp4/tests/inform_unittest.cc
View File

@ -268,6 +268,8 @@ TEST_F(InformTest, directClientNoCiaddr) {
EXPECT_EQ(IOAddress("10.0.0.56"), resp->getLocalAddr());
// Response must not be relayed.
EXPECT_FALSE(resp->isRelayed());
EXPECT_EQ(DHCP4_CLIENT_PORT, resp->getLocalPort());
EXPECT_EQ(DHCP4_SERVER_PORT, resp->getRemotePort());
// Make sure that the server id is present.
EXPECT_EQ("10.0.0.1", client.config_.serverid_.toText());
// Make sure that the Routers option has been received.