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[trac4000] Exception handling in DHCPv6 improved

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- std::exception is now caught
 - try/catch clause added around handleSignal
This commit is contained in:
Tomek Mrugalski
2015-08-20 16:36:24 +02:00
parent f71885fb8a
commit be4c905d3d
2 changed files with 29 additions and 3 deletions
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8
src/bin/dhcp6/dhcp6_messages.mes
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@@ -242,6 +242,14 @@ probable if you see many such messages. Clients will recover from this,
but they will most likely get a different IP addresses and experience
a brief service interruption.
% DHCP6_HANDLE_SIGNAL_EXCEPTION_ISC An ISC exception was thrown while handing signal: %1
This error message is printed when an ISC exception was raised during signal
processing. This likely indicates a coding error and should be reported to ISC.
% DHCP6_HANDLE_SIGNAL_EXCEPTION_STD An standard exception was thrown while handing signal: %1
This error message is printed when a standard type exception was raised during signal
processing. This likely indicates a coding error and should be reported to ISC.
% DHCP6_HOOKS_LIBS_RELOAD_FAIL reload of hooks libraries failed
A "libreload" command was issued to reload the hooks libraries but for
some reason the reload failed. Other error messages issued from the

24
src/bin/dhcp6/dhcp6_srv.cc
View File

@@ -382,7 +382,24 @@ bool Dhcpv6Srv::run() {
// is called. If the function was called before receivePacket the
// process could wait up to the duration of timeout of select() to
// terminate.
handleSignal();
try {
handleSignal();
} catch (const isc::Exception& e) {
// ISC-derived exception occurred. The nature of this exception
// indicates that it originated from ISC code. If this happens,
// it will be easy to fix as it is in the code that is under
// ISC control.
LOG_ERROR(dhcp6_logger, DHCP6_HANDLE_SIGNAL_EXCEPTION_ISC)
.arg(e.what());
} catch (const std::exception& e) {
// Standard exception occurred. The nature of this exception
// indicates that it was caused in non-ISC code. Fixing this
// issue will be somewhat more difficult than the one caused
// by ISC code.
LOG_ERROR(dhcp6_logger, DHCP6_HANDLE_SIGNAL_EXCEPTION_STD)
.arg(e.what());
}
// Execute ready timers for the lease database, e.g. Lease File Cleanup.
try {
@@ -585,11 +602,12 @@ bool Dhcpv6Srv::run() {
// Increase the statistic of dropped packets.
StatsMgr::instance().addValue("pkt6-receive-drop", static_cast<int64_t>(1));
} catch (const isc::Exception& e) {
} catch (const std::exception& e) {
// Catch-all exception (at least for ones based on the isc Exception
// class, which covers more or less all that are explicitly raised
// in the Kea code). Just log the problem and ignore the packet.
// in the Kea code), but also the standard one, which may possibly be
// thrown from boost code. Just log the problem and ignore the packet.
// (The problem is logged as a debug message because debug is
// disabled by default - it prevents a DDOS attack based on the
// sending of problem packets.)