Commit d20b1f2c authored by Marcin Siodelski's avatar Marcin Siodelski
Browse files

[2902] Direct traffic is optional in the Dhcp4Srv to allow unit testing.

parent b9be6a95
......@@ -57,7 +57,8 @@ static const char* SERVER_ID_FILE = "b10-dhcp4-serverid";
// These are hardcoded parameters. Currently this is a skeleton server that only
// grants those options and a single, fixed, hardcoded lease.
Dhcpv4Srv::Dhcpv4Srv(uint16_t port, const char* dbconfig, const bool use_bcast) {
Dhcpv4Srv::Dhcpv4Srv(uint16_t port, const char* dbconfig, const bool use_bcast,
const bool direct_response_desired) {
LOG_DEBUG(dhcp4_logger, DBG_DHCP4_START, DHCP4_OPEN_SOCKET).arg(port);
try {
// First call to instance() will create IfaceMgr (it's a singleton)
......@@ -67,7 +68,7 @@ Dhcpv4Srv::Dhcpv4Srv(uint16_t port, const char* dbconfig, const bool use_bcast)
// to the client which doesn't have address assigned. This capability
// may be lacking on some OSes, so there is no guarantee that server
// will be able to respond directly.
if (port) {
// open sockets only if port is non-zero. Port 0 is used
......@@ -61,15 +61,20 @@ class Dhcpv4Srv : public boost::noncopyable {
/// network interaction. Will instantiate lease manager, and load
/// old or create new DUID. It is possible to specify alternate
/// port on which DHCPv4 server will listen on. That is mostly useful
/// for testing purposes.
/// for testing purposes. The Last two arguments of the constructor
/// should be left at default values for normal server operation.
/// They should be disabled when creating an instance of this class
/// for unit testing as enabling them requires root privilegs.
/// @param port specifies port number to listen on
/// @param dbconfig Lease manager configuration string. The default
/// of the "memfile" manager is used for testing.
/// @param use_bcast configure sockets to support broadcast messages.
/// @param specifies if it is desired to support direct V4 traffic.
Dhcpv4Srv(uint16_t port = DHCP4_SERVER_PORT,
const char* dbconfig = "type=memfile",
const bool use_bcast = true);
const bool use_bcast = true,
const bool direct_response_desired = true);
/// @brief Destructor. Used during DHCPv4 service shutdown.
......@@ -50,10 +50,12 @@ public:
/// It disables configuration of broadcast options on
/// sockets that are opened by the Dhcpv4Srv constructor.
/// Setting broadcast options requires root privileges
/// which is not the case when running unit tests.
/// Also, disables the Direct V4 traffic as it requires
/// use of raw sockets. Use of broadcast as well as raw
/// sockets require root privileges, thus can't be used
/// in unit testing.
NakedDhcpv4Srv(uint16_t port = 0)
: Dhcpv4Srv(port, "type=memfile", false) {
: Dhcpv4Srv(port, "type=memfile", false, false) {
using Dhcpv4Srv::processDiscover;
......@@ -28,25 +28,12 @@ PktFilterInet::PktFilterInet()
// iface is only used when SO_BINDTODEVICE is defined and thus
// the code section using this variable is compiled.
int PktFilterInet::openSocket(const Iface& iface,
const isc::asiolink::IOAddress& addr,
const uint16_t port,
const bool receive_bcast,
const bool send_bcast) {
int PktFilterInet::openSocket(const Iface&,
const isc::asiolink::IOAddress& addr,
const uint16_t port,
const bool receive_bcast,
const bool send_bcast) {
struct sockaddr_in addr4;
memset(&addr4, 0, sizeof(sockaddr));
addr4.sin_family = AF_INET;
......@@ -54,7 +41,7 @@ int PktFilterInet::openSocket(const Iface&,
// If we are to receive broadcast messages we have to bind
// to "ANY" address.
if (receive_bcast) {
if (receive_bcast && iface.flag_broadcast_) {
addr4.sin_addr.s_addr = INADDR_ANY;
} else {
addr4.sin_addr.s_addr = htonl(addr);
......@@ -77,7 +64,7 @@ int PktFilterInet::openSocket(const Iface&,
if (send_bcast) {
if (send_bcast && iface.flag_broadcast_) {
// Enable sending to broadcast address.
int flag = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &flag, sizeof(flag)) < 0) {
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