[fuzz] add CLI UART input to fuzz tests (#3482)

tests/fuzz/Makefile.am

@@ -29,6 +29,7 @@
 include $(abs_top_nlbuild_autotools_dir)/automake/pre.am
 
 bin_PROGRAMS                                              = \
+    cli-uart-received-fuzzer                                \
     ip6-send-fuzzer                                         \
     radio-receive-done-fuzzer                               \
     ncp-uart-received-fuzzer                                \
@@ -40,19 +41,29 @@ AM_CPPFLAGS                                               = \
     $(NULL)
 
 COMMON_LDADD                                              = \
-    $(top_builddir)/src/ncp/libopenthread-ncp-ftd.a         \
     $(top_builddir)/src/core/libopenthread-ftd.a            \
     $(top_builddir)/third_party/mbedtls/libmbedcrypto.a     \
     $(LIB_FUZZING_ENGINE)                                   \
     $(NULL)
 
+cli_uart_received_fuzzer_LDADD                            = \
+    $(top_builddir)/src/cli/libopenthread-cli-ftd.a         \
+    $(COMMON_LDADD)                                         \
+    $(NULL)
+
+cli_uart_received_fuzzer_SOURCES                          = cli_uart_received.cpp fuzzer_platform.c
+
 ip6_send_fuzzer_LDADD                                     = $(COMMON_LDADD)
 ip6_send_fuzzer_SOURCES                                   = ip6_send.cpp fuzzer_platform.c
 
 radio_receive_done_fuzzer_LDADD                           = $(COMMON_LDADD)
 radio_receive_done_fuzzer_SOURCES                         = radio_receive_done.cpp fuzzer_platform.c
 
-ncp_uart_received_fuzzer_LDADD                            = $(COMMON_LDADD)
+ncp_uart_received_fuzzer_LDADD                            = \
+    $(top_builddir)/src/ncp/libopenthread-ncp-ftd.a         \
+    $(COMMON_LDADD)                                         \
+    $(NULL)
+
 ncp_uart_received_fuzzer_SOURCES                          = ncp_uart_received.cpp fuzzer_platform.c
 
 include $(abs_top_nlbuild_autotools_dir)/automake/post.am

tests/fuzz/cli_uart_received.cpp

@@ -0,0 +1,81 @@
+/*
+ *  Copyright (c) 2019, The OpenThread Authors.
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the copyright holder nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <openthread/cli.h>
+#include <openthread/instance.h>
+#include <openthread/ip6.h>
+#include <openthread/link.h>
+#include <openthread/thread.h>
+#include <openthread/thread_ftd.h>
+#include <openthread/platform/uart.h>
+
+#include "common/code_utils.hpp"
+
+extern "C" void FuzzerPlatformInit(void);
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    const otPanId panId = 0xdead;
+
+    otInstance *instance = NULL;
+    uint8_t *   buf      = NULL;
+
+    VerifyOrExit(size <= 65536);
+
+    FuzzerPlatformInit();
+
+    instance = otInstanceInitSingle();
+    otCliUartInit(instance);
+    otLinkSetPanId(instance, panId);
+    otIp6SetEnabled(instance, true);
+    otThreadSetEnabled(instance, true);
+    otThreadBecomeLeader(instance);
+
+    buf = static_cast<uint8_t *>(malloc(size));
+
+    memcpy(buf, data, size);
+
+    otPlatUartReceived(buf, (uint16_t)size);
+
+exit:
+
+    if (buf != NULL)
+    {
+        free(buf);
+    }
+
+    if (instance != NULL)
+    {
+        otInstanceFinalize(instance);
+    }
+
+    return 0;
+}

tests/fuzz/fuzzer_platform.c

@@ -78,6 +78,19 @@ void otPlatAlarmMicroStop(otInstance *aInstance)
     (void)aInstance;
 }
 
+bool otDiagIsEnabled(void)
+{
+    return false;
+}
+
+void otDiagProcessCmd(int aArgCount, char *aArgVector[], char *aOutput, size_t aOutputMaxLen)
+{
+    (void)aArgCount;
+    (void)aArgVector;
+    (void)aOutput;
+    (void)aOutputMaxLen;
+}
+
 void otDiagProcessCmdLine(const char *aString, char *aOutput, size_t aOutputMaxLen)
 {
     (void)aString;