fix api_fuzzer for srv request

PiperOrigin-RevId: 650375294

test/core/end2end/fuzzers/api_fuzzer.cc

@@ -212,7 +212,7 @@ class FuzzerDNSResolver : public grpc_core::DNSResolver {
 
 }  // namespace
 
-grpc_ares_request* my_dns_lookup_ares(
+grpc_ares_request* my_dns_lookup_hostname_ares(
     const char* /*dns_server*/, const char* addr, const char* /*default_port*/,
     grpc_pollset_set* /*interested_parties*/, grpc_closure* on_done,
     std::unique_ptr<grpc_core::EndpointAddressesList>* addresses,
@@ -229,8 +229,25 @@ grpc_ares_request* my_dns_lookup_ares(
   return nullptr;
 }
 
+grpc_ares_request* my_dns_lookup_srv_ares(
+    const char* /*dns_server*/, const char* name,
+    grpc_pollset_set* /*interested_parties*/, grpc_closure* on_done,
+    std::unique_ptr<grpc_core::EndpointAddressesList>* balancer_addresses,
+    int /*query_timeout*/) {
+  addr_req r;
+  r.addr = gpr_strdup(name);
+  r.on_done = on_done;
+  r.addresses = balancer_addresses;
+  GetDefaultEventEngine()->RunAfter(grpc_core::Duration::Seconds(1), [r] {
+    grpc_core::ApplicationCallbackExecCtx callback_exec_ctx;
+    grpc_core::ExecCtx exec_ctx;
+    finish_resolve(r);
+  });
+  return nullptr;
+}
+
 static void my_cancel_ares_request(grpc_ares_request* request) {
-  CHECK_EQ(request, nullptr);
+  CHECK_NE(request, nullptr);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -400,7 +417,8 @@ namespace testing {
 ApiFuzzer::ApiFuzzer(const fuzzing_event_engine::Actions& actions)
     : BasicFuzzer(actions) {
   ResetDNSResolver(std::make_unique<FuzzerDNSResolver>(engine().get()));
-  grpc_dns_lookup_hostname_ares = my_dns_lookup_ares;
+  grpc_dns_lookup_hostname_ares = my_dns_lookup_hostname_ares;
+  grpc_dns_lookup_srv_ares = my_dns_lookup_srv_ares;
   grpc_cancel_ares_request = my_cancel_ares_request;
 
   CHECK_EQ(channel_, nullptr);

test/core/end2end/fuzzers/api_fuzzer_corpus/testcase-6068690547703808

@@ -0,0 +1,14 @@
+actions {
+  create_channel {
+    target: "ugsix: "
+    channel_args {
+      args {
+        key: "grpc.dns_enable_srv_queries"
+        i: 101097569197329
+      }
+    }
+  }
+}
+actions {
+  check_connectivity: true
+}