Refs #21751. Added static assertions for structure sizes.

Signed-off-by: Miguel Company <miguelcompany@eprosima.com>

test/blackbox/common/BlackboxTestsTransportUDP.cpp

@@ -645,10 +645,16 @@ static void KeyOnlyBigPayloadIgnored(
 {
  struct KeyOnlyBigPayloadDatagram
  {
- std::array<char, 4> rtps_id{ {'R', 'T', 'P', 'S'} };
- std::array<uint8_t, 2> protocol_version{ {2, 3} };
- std::array<uint8_t, 2> vendor_id{ {0x01, 0x0F} };
- GuidPrefix_t sender_prefix{};
+ struct RTPSHeader
+ {
+ std::array<char, 4> rtps_id{ {'R', 'T', 'P', 'S'} };
+ std::array<uint8_t, 2> protocol_version{ {2, 3} };
+ std::array<uint8_t, 2> vendor_id{ {0x01, 0x0F} };
+ GuidPrefix_t sender_prefix{};
+ }
+ header;
+
+ static_assert(sizeof(RTPSHeader) == RTPSMESSAGE_HEADER_SIZE, "Unexpected size for RTPS header");
 
  struct DataSubMsg
  {
@@ -668,6 +674,8 @@ static void KeyOnlyBigPayloadIgnored(
  SequenceNumber_t sn{ 2 };
  };
 
+ static_assert(sizeof(Header) == RTPSMESSAGE_DATA_MIN_LENGTH, "Unexpected size for DATA header");
+
  struct InlineQoS
  {
  // PID_STATUS_INFO (unregistered + disposed)
@@ -688,20 +696,34 @@ static void KeyOnlyBigPayloadIgnored(
  Sentinel sentinel;
  };
 
+ static_assert(sizeof(InlineQoS) == 8 + 4, "Unexpected size for InlineQoS");
+
  struct SerializedData
  {
  std::array<uint8_t, 2> encapsulation {{0}};
  std::array<uint8_t, 2> encapsulation_opts {{0}};
  std::array<uint8_t, 0x24> data {{0}};
  };
 
+ static_assert(sizeof(SerializedData) == 0x24 + 2 + 2, "Unexpected size for SerializedData");
+
  Header header;
  InlineQoS qos;
  SerializedData payload;
  }
  data;
+
+ static_assert(
+ sizeof(DataSubMsg) ==
+ sizeof(DataSubMsg::Header) + sizeof(DataSubMsg::InlineQoS) + sizeof(DataSubMsg::SerializedData),
+ "Unexpected size for DataSubMsg");
  };
 
+ static_assert(
+ sizeof(KeyOnlyBigPayloadDatagram) ==
+ sizeof(KeyOnlyBigPayloadDatagram::RTPSHeader) + sizeof(KeyOnlyBigPayloadDatagram::DataSubMsg),
+ "Unexpected size for KeyOnlyBigPayloadDatagram");
+
  UDPMessageSender fake_msg_sender;
 
  // Force using UDP transport
@@ -743,7 +765,7 @@ static void KeyOnlyBigPayloadIgnored(
  auto writer_guid = writer.datawriter_guid();
 
  KeyOnlyBigPayloadDatagram malicious_packet{};
- malicious_packet.sender_prefix = writer_guid.guidPrefix;
+ malicious_packet.header.sender_prefix = writer_guid.guidPrefix;
  malicious_packet.data.header.writer_id = writer_guid.entityId;
  malicious_packet.data.header.reader_id = reader.datareader_guid().entityId;
  malicious_packet.data.payload.encapsulation[1] = CDR_LE;