Smalls improvements

- Improve robustness reading a BCM socket
  Adding checks on system calls and remove the initialization of the
  struct that will hold the received message, not so much needed in
  that case.
- More accurate log message at subscription/unsubscription step whether
  this is a FD CAN messages or not and if this a subscription or an
  unsubscription that is requested.
- Initialize the full struct of vehicle message to avoid memory warning
  about conditionnal jump based on uninitialized bytes.
- Memleak: Free raw pointer on active diagnostic requests

Change-Id: I4bbf4d851c0fa1efdb6fa6034fac3d1dcafa1a73
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

2 files changed, 14 insertions, 3 deletions

diff --git a/low-can-binding/utils/openxc-utils.cpp b/low-can-binding/utils/openxc-utils.cpp
index e454121b..c06beabb 100644
--- a/low-can-binding/utils/openxc-utils.cpp
+++ b/low-can-binding/utils/openxc-utils.cpp
@@ -34,6 +34,7 @@
 const openxc_VehicleMessage build_VehicleMessage(active_diagnostic_request_t* request, const DiagnosticResponse& response, float parsed_value)
 {
 	openxc_VehicleMessage message;
+	::memset(&message, 0, sizeof(message));
 	application_t& app = application_t::instance();
 
 	message.has_type = true;
@@ -98,6 +99,7 @@ const openxc_VehicleMessage build_VehicleMessage(active_diagnostic_request_t* re
 const openxc_VehicleMessage build_VehicleMessage(const openxc_SimpleMessage& message, uint64_t timestamp)
 {
 	openxc_VehicleMessage v;
+	::memset(&v, 0, sizeof(v));
 
 	v.has_type = true,
 	v.type = openxc_VehicleMessage_Type::openxc_VehicleMessage_Type_SIMPLE;
@@ -120,6 +122,7 @@ const openxc_VehicleMessage build_VehicleMessage(const openxc_SimpleMessage& mes
 const openxc_VehicleMessage build_VehicleMessage(const openxc_SimpleMessage& message)
 {
 	openxc_VehicleMessage v;
+	::memset(&v, 0, sizeof(v));
 
 	v.has_type = true,
 	v.type = openxc_VehicleMessage_Type::openxc_VehicleMessage_Type_SIMPLE;
@@ -141,7 +144,7 @@ openxc_VehicleMessage build_VehicleMessage()
 {
 	openxc_VehicleMessage v;
 
-	::memset(&v, 0, sizeof(openxc_VehicleMessage));
+	::memset(&v, 0, sizeof(v));
 	return v;
 }
 
diff --git a/low-can-binding/utils/socketcan-bcm.cpp b/low-can-binding/utils/socketcan-bcm.cpp
index d1fd8e0a..3f3a0968 100644
--- a/low-can-binding/utils/socketcan-bcm.cpp
+++ b/low-can-binding/utils/socketcan-bcm.cpp
@@ -74,14 +74,22 @@ namespace utils
 	{
 		struct utils::bcm_msg msg;
 
-		::memset(&msg, 0, sizeof(msg));
 		const struct sockaddr_can& addr = s.get_tx_address();
 		socklen_t addrlen = sizeof(addr);
 		struct ifreq ifr;
 
 		ssize_t nbytes = ::recvfrom(s.socket(), &msg, sizeof(msg), 0, (struct sockaddr*)&addr, &addrlen);
+		if(nbytes < 0)
+		{
+			AFB_ERROR("Can't read the next message from socket '%d'. '%s'", s.socket(), strerror(errno));
+			return s;
+		}
 		ifr.ifr_ifindex = addr.can_ifindex;
-		ioctl(s.socket(), SIOCGIFNAME, &ifr);
+		if(ioctl(s.socket(), SIOCGIFNAME, &ifr) < 0)
+		{
+			AFB_ERROR("Can't read the interface name. '%s'", strerror(errno));
+			return s;
+		}
 		long unsigned int frame_size = nbytes-sizeof(struct bcm_msg_head);
 
 		AFB_DEBUG("Data available: %li bytes read. BCM head, opcode: %i, can_id: %i, nframes: %i", frame_size, msg.msg_head.opcode, msg.msg_head.can_id, msg.msg_head.nframes);