move fuzz into test/fuzz

test/fuzz/net_fuzz.cc

@@ -0,0 +1,82 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Nathaniel Brough
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "tusb_config.h"
+#if defined(CFG_TUD_ECM_RNDIS) || defined(CFG_TUD_NCM)
+
+#include "class/net/net_device.h"
+#include "fuzz_private.h"
+#include <cassert>
+#include <cstdint>
+#include <vector>
+#include "lwip/sys.h"
+
+extern "C" {
+bool tud_network_recv_cb(const uint8_t *src, uint16_t size) {
+  assert(_fuzz_data_provider.has_value());
+  (void)src;
+  (void)size;
+  return _fuzz_data_provider->ConsumeBool();
+}
+
+// client must provide this: copy from network stack packet pointer to dst
+uint16_t tud_network_xmit_cb(uint8_t *dst, void *ref, uint16_t arg) {
+  (void)ref;
+  (void)arg;
+
+  assert(_fuzz_data_provider.has_value());
+
+  uint16_t size = _fuzz_data_provider->ConsumeIntegral<uint16_t>();
+  std::vector<uint8_t> temp = _fuzz_data_provider->ConsumeBytes<uint8_t>(size);
+  memcpy(dst, temp.data(), temp.size());
+  return size;
+}
+
+/* lwip has provision for using a mutex, when applicable */
+sys_prot_t sys_arch_protect(void) { return 0; }
+void sys_arch_unprotect(sys_prot_t pval) { (void)pval; }
+
+//------------- ECM/RNDIS -------------//
+
+// client must provide this: initialize any network state back to the beginning
+void tud_network_init_cb(void) {
+  // NoOp.
+}
+
+// client must provide this: 48-bit MAC address
+// TODO removed later since it is not part of tinyusb stack
+const uint8_t tud_network_mac_address[6] = {0};
+
+//------------- NCM -------------//
+
+// callback to client providing optional indication of internal state of network
+// driver
+void tud_network_link_state_cb(bool state) {
+  (void)state;
+  // NoOp.
+}
+}
+
+#endif