Merge #20247: fuzz: Check for addrv1 compatibility before using addrv…

…1 serializer. Fuzz addrv2 serialization.

903f3d0 fuzz: Check for addrv1 compatibility before using addrv1 serializer (practicalswift)

Pull request description:

  Fuzz addrv2 address serialization.

  Check for addrv1 compatibility before using addrv1 serializer.

  Before this

  ```
  $ src/test/fuzz/netaddr_deserialize
  netaddr_deserialize: test/fuzz/deserialize.cpp:84: void
      (anonymous namespace)::AssertEqualAfterSerializeDeserialize(const T &) [T = CNetAddr]:
      Assertion `Deserialize<T>(Serialize(obj)) == obj' failed.
  ```

  After this patch:

  ```
  $ src/test/fuzz/netaddr_deserialize
  …
  ```

ACKs for top commit:
  MarcoFalke:
    review ACK 903f3d0

Tree-SHA512: a9ddb71cc31c877fa3dd78dbc908d1e30b4790398fefe19e6541f1fca81e8560f7a11fa099ef3943b94401974c472e523484fdf66f1c23ff2e998558ba4b65de

src/test/fuzz/deserialize.cpp

@@ -13,6 +13,7 @@
 #include <key.h>
 #include <merkleblock.h>
 #include <net.h>
+#include <netbase.h>
 #include <node/utxo_snapshot.h>
 #include <primitives/block.h>
 #include <protocol.h>
@@ -44,9 +45,9 @@ struct invalid_fuzzing_input_exception : public std::exception {
 };
 
 template <typename T>
-CDataStream Serialize(const T& obj)
+CDataStream Serialize(const T& obj, const int version = INIT_PROTO_VERSION)
 {
-    CDataStream ds(SER_NETWORK, INIT_PROTO_VERSION);
+    CDataStream ds(SER_NETWORK, version);
     ds << obj;
     return ds;
 }
@@ -79,9 +80,9 @@ void DeserializeFromFuzzingInput(const std::vector<uint8_t>& buffer, T& obj)
 }
 
 template <typename T>
-void AssertEqualAfterSerializeDeserialize(const T& obj)
+void AssertEqualAfterSerializeDeserialize(const T& obj, const int version = INIT_PROTO_VERSION)
 {
-    assert(Deserialize<T>(Serialize(obj)) == obj);
+    assert(Deserialize<T>(Serialize(obj, version)) == obj);
 }
 
 } // namespace
@@ -183,7 +184,10 @@ void test_one_input(const std::vector<uint8_t>& buffer)
 #elif NETADDR_DESERIALIZE
         CNetAddr na;
         DeserializeFromFuzzingInput(buffer, na);
-        AssertEqualAfterSerializeDeserialize(na);
+        if (na.IsAddrV1Compatible()) {
+            AssertEqualAfterSerializeDeserialize(na);
+        }
+        AssertEqualAfterSerializeDeserialize(na, INIT_PROTO_VERSION | ADDRV2_FORMAT);
 #elif SERVICE_DESERIALIZE
         CService s;
         DeserializeFromFuzzingInput(buffer, s);