BIND 10 trac2902, updated. 85d28a85b04c5c6a6905c6e018dc9a899afc4494 [2902] Do not allow to set new packet filter when there are sockets open.
BIND 10 source code commits
bind10-changes at lists.isc.org
Fri Apr 26 14:49:17 UTC 2013
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via 85d28a85b04c5c6a6905c6e018dc9a899afc4494 (commit)
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- Log -----------------------------------------------------------------
commit 85d28a85b04c5c6a6905c6e018dc9a899afc4494
Author: Marcin Siodelski <marcin at isc.org>
Date: Fri Apr 26 16:48:59 2013 +0200
[2902] Do not allow to set new packet filter when there are sockets open.
-----------------------------------------------------------------------
Summary of changes:
src/lib/dhcp/iface_mgr.cc | 30 ++++++++++++++++++++++++++++++
src/lib/dhcp/iface_mgr.h | 19 ++++++++++++-------
src/lib/dhcp/tests/iface_mgr_unittest.cc | 29 +++++++++++++++++++++--------
3 files changed, 63 insertions(+), 15 deletions(-)
-----------------------------------------------------------------------
diff --git a/src/lib/dhcp/iface_mgr.cc b/src/lib/dhcp/iface_mgr.cc
index b5c155b..93e6205 100644
--- a/src/lib/dhcp/iface_mgr.cc
+++ b/src/lib/dhcp/iface_mgr.cc
@@ -203,6 +203,36 @@ IfaceMgr::isDirectResponseSupported() const {
return (packet_filter_->isDirectResponseSupported());
}
+void
+IfaceMgr::setPacketFilter(const boost::shared_ptr<PktFilter>& packet_filter) {
+ // Do not allow NULL pointer.
+ if (!packet_filter) {
+ isc_throw(InvalidPacketFilter, "NULL packet filter object specified");
+ }
+ // Different packet filters use different socket types. It does not make
+ // sense to allow the change of packet filter when there are IPv4 sockets
+ // open because they can't be used by the receive/send functions of the
+ // new packet filter. Below, we check that there are no open IPv4 sockets.
+ // If we find at least one, we have to fail. However, caller still has a
+ // chance to replace the packet filter if he closes sockets explicitly.
+ for (IfaceCollection::const_iterator iface = ifaces_.begin();
+ iface != ifaces_.end(); ++iface) {
+ const Iface::SocketCollection& sockets = iface->getSockets();
+ for (Iface::SocketCollection::const_iterator sock = sockets.begin();
+ sock != sockets.end(); ++sock) {
+ // There is at least one socket open, so we have to fail.
+ if (sock->family_ == AF_INET) {
+ isc_throw(PacketFilterChangeDenied, "it is not allowed to set new packet"
+ << " filter when there are open IPv4 sockets - need"
+ << " to close them first");
+ }
+ }
+ }
+ // Everything is fine, so replace packet filter.
+ packet_filter_ = packet_filter;
+}
+
+
void IfaceMgr::stubDetectIfaces() {
string ifaceName;
const string v4addr("127.0.0.1"), v6addr("::1");
diff --git a/src/lib/dhcp/iface_mgr.h b/src/lib/dhcp/iface_mgr.h
index 7dd8bac..6eb9740 100644
--- a/src/lib/dhcp/iface_mgr.h
+++ b/src/lib/dhcp/iface_mgr.h
@@ -39,6 +39,13 @@ public:
isc::Exception(file, line, what) { };
};
+/// @brief Exception thrown when it is not allowed to set new Packet Filter.
+class PacketFilterChangeDenied : public Exception {
+public:
+ PacketFilterChangeDenied(const char* file, size_t line, const char* what) :
+ isc::Exception(file, line, what) { };
+};
+
/// @brief IfaceMgr exception thrown thrown when socket opening
/// or configuration failed.
class SocketConfigError : public Exception {
@@ -602,18 +609,16 @@ public:
/// Packet Filters expose low-level functions handling sockets opening
/// and sending/receiving packets through those sockets. This function
/// sets custom Packet Filter (represented by a class derived from PktFilter)
- /// to be used by IfaceMgr.
+ /// to be used by IfaceMgr. Note that, there must be no IPv4 sockets
+ /// when this function is called. Call closeSockets(AF_INET) to close
+ /// all hanging IPv4 sockets opened by the current packet filter object.
///
/// @param packet_filter new packet filter to be used by IfaceMgr to send/receive
/// packets and open sockets.
///
/// @throw InvalidPacketFilter if provided packet filter object is NULL.
- void setPacketFilter(const boost::shared_ptr<PktFilter>& packet_filter) {
- if (!packet_filter) {
- isc_throw(InvalidPacketFilter, "NULL packet filter object specified");
- }
- packet_filter_ = packet_filter;
- }
+ /// @throw PacketFilterChangeDenied if there are open IPv4 sockets
+ void setPacketFilter(const boost::shared_ptr<PktFilter>& packet_filter);
/// @brief Set Packet Filter object to handle send/receive packets.
///
diff --git a/src/lib/dhcp/tests/iface_mgr_unittest.cc b/src/lib/dhcp/tests/iface_mgr_unittest.cc
index e2e5191..89a2110 100644
--- a/src/lib/dhcp/tests/iface_mgr_unittest.cc
+++ b/src/lib/dhcp/tests/iface_mgr_unittest.cc
@@ -689,19 +689,23 @@ TEST_F(IfaceMgrTest, socketsFromRemoteAddress) {
// open sockets on the same ports.
ifacemgr->closeSockets();
- // The following test is currently disabled for OSes other than
- // Linux because interface detection is not implemented on them.
- // @todo enable this test for all OSes once interface detection
- // is implemented.
-#if defined(OS_LINUX)
+ // The check below has been commented out. It verified the ability
+ // to open suitable socket for sending broadcast request. However,
+ // there is no guarantee for such test to work on all systems
+ // because some systems may have no broadcast capable interfaces at all.
+
+/* #if defined(OS_LINUX)
// Open v4 socket to connect to broadcast address.
int socket3 = 0;
IOAddress bcastAddr("255.255.255.255");
- EXPECT_NO_THROW(
+ try {
socket3 = ifacemgr->openSocketFromRemoteAddress(bcastAddr, PORT2);
- );
+ } catch (const Exception& ex) {
+ std::cout << ex.what() << std::endl;
+ FAIL();
+ }
EXPECT_GT(socket3, 0);
-#endif
+#endif */
// Do not call closeSockets() because it is called by IfaceMgr's
// virtual destructor.
@@ -919,6 +923,15 @@ TEST_F(IfaceMgrTest, setPacketFilter) {
EXPECT_TRUE(custom_packet_filter->open_socket_called_);
// This function always returns fake socket descriptor equal to 1024.
EXPECT_EQ(1024, socket1);
+
+ // Replacing current packet filter object while there are IPv4
+ // sockets open is not allowed!
+ EXPECT_THROW(iface_mgr->setPacketFilter(custom_packet_filter),
+ PacketFilterChangeDenied);
+
+ // So, let's close the open IPv4 sockets and retry. Now it should succeed.
+ iface_mgr->closeSockets(AF_INET);
+ EXPECT_NO_THROW(iface_mgr->setPacketFilter(custom_packet_filter));
}
#if defined OS_LINUX
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