[fuzz] add support to build fuzzing targets (openthread#2014)

This enables adding OpenThread to OSS-Fuzz.

configure.ac

@@ -297,6 +297,29 @@ NL_ENABLE_OPTIMIZATION([yes])
 
 AM_CONDITIONAL([OPENTHREAD_BUILD_OPTIMIZED], [test "${nl_cv_build_optimized}" = "yes"])
 
+# Fuzz Targets
+
+AC_MSG_CHECKING([whether to build fuzz targets])
+AC_ARG_ENABLE(fuzz-targets,
+    [AS_HELP_STRING([--enable-fuzz-targets],[Enable building of fuzz targets @<:@default=no@:>@.])],
+    [
+        case "${enableval}" in
+
+        no|yes)
+            enable_fuzz_targets=${enableval}
+            ;;
+
+        *)
+            AC_MSG_ERROR([Invalid value ${enableval} for --enable-fuzz-targets])
+            ;;
+
+        esac
+    ],
+    [enable_fuzz_targets=no])
+AC_MSG_RESULT(${enable_fuzz_targets})
+
+AM_CONDITIONAL([OPENTHREAD_ENABLE_FUZZ_TARGETS], [test "${enable_fuzz_targets}" = "yes"])
+
 # Address Sanitizer
 
 AC_MSG_CHECKING([whether to build with Address Sanitizer support])
@@ -1376,6 +1399,7 @@ tools/harness-automation/Makefile
 tools/harness-thci/Makefile
 tools/spi-hdlc-adapter/Makefile
 tests/Makefile
+tests/fuzz/Makefile
 tests/scripts/Makefile
 tests/scripts/thread-cert/Makefile
 tests/unit/Makefile
@@ -1413,6 +1437,7 @@ AC_MSG_NOTICE([
   Lcov                                      : ${LCOV:--}
   Genhtml                                   : ${GENHTML:--}
   Build tests                               : ${nl_cv_build_tests}
+  Build fuzz targets                        : ${enable_fuzz_targets}
   Build tools                               : ${build_tools}
   OpenThread tests                          : ${with_tests}
   Prefix                                    : ${prefix}

tests/Makefile.am

@@ -33,24 +33,33 @@ include $(abs_top_nlbuild_autotools_dir)/automake/pre.am
 DIST_SUBDIRS                            = \
     unit                                  \
     scripts                               \
+    fuzz                                  \
     $(NULL)
 
 # Always build (e.g. for 'make all') these subdirectories.
 
-if OPENTHREAD_EXAMPLES_POSIX
-if OPENTHREAD_ENABLE_CLI
 SUBDIRS                                 = \
-    unit                                  \
-    scripts                               \
     $(NULL)
-endif
-endif
 
 # Always pretty (e.g. for 'make pretty') these subdirectories.
 
 PRETTY_SUBDIRS                          = \
+    fuzz                                  \
+    unit                                  \
+    $(NULL)
+
+if OPENTHREAD_EXAMPLES_POSIX
+if OPENTHREAD_ENABLE_CLI
+SUBDIRS                                += \
     unit                                  \
+    scripts                               \
     $(NULL)
+endif
+endif
+
+if OPENTHREAD_ENABLE_FUZZ_TARGETS
+SUBDIRS                                += fuzz
+endif
 
 if OPENTHREAD_BUILD_TESTS
 if OPENTHREAD_BUILD_COVERAGE

tests/fuzz/Makefile.am

@@ -0,0 +1,49 @@
+#
+#  Copyright (c) 2017, 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 $(abs_top_nlbuild_autotools_dir)/automake/pre.am
+
+bin_PROGRAMS                                              = \
+    radio-receive-done-fuzzer                               \
+    $(NULL)
+
+AM_CPPFLAGS                                               = \
+    -I$(top_srcdir)/include                                 \
+    -I$(top_srcdir)/src/core                                \
+    $(NULL)
+
+COMMON_LDADD                                              = \
+    $(top_builddir)/src/core/libopenthread-ftd.a            \
+    $(top_builddir)/third_party/mbedtls/libmbedcrypto.a     \
+    $(LIB_FUZZING_ENGINE)                                   \
+    $(NULL)
+
+radio_receive_done_fuzzer_LDADD                           = $(COMMON_LDADD)
+radio_receive_done_fuzzer_SOURCES                         = radio_receive_done.cpp fuzzer_platform.c
+
+include $(abs_top_nlbuild_autotools_dir)/automake/post.am