From 85c3fe47292f4e4e47a1f58f1347cb1f6d03b37e Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Tue, 20 Oct 2020 15:31:52 +0200
Subject: [BUILD] add option to build the dnbd3-server with afl-fuzz support

The afl-fuzz support for the dnbd3-server requires an AFL C compiler
like afl-gcc and can be enabled with the CMake option DNBD3_SERVER_AFL.
---
 src/server/CMakeLists.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/server/CMakeLists.txt')

diff --git a/src/server/CMakeLists.txt b/src/server/CMakeLists.txt
index 1855d91..aa981f6 100644
--- a/src/server/CMakeLists.txt
+++ b/src/server/CMakeLists.txt
@@ -13,9 +13,27 @@ endif(NOT JANSSON_FOUND)
 add_definitions(-D_GNU_SOURCE)
 
 if(DNBD3_SERVER_AFL)
+    # check if DNBD3_RELEASE_HARDEN is disabled
+    if(DNBD3_RELEASE_HARDEN)
+        message(FATAL_ERROR "DNBD3_SERVER_AFL can only be enabled if DNBD3_RELEASE_HARDEN is disabled")
+    endif(DNBD3_RELEASE_HARDEN)
+
     # build dnbd3-server with AFL support
     message(STATUS "Building dnbd3-server with AFL support")
     add_definitions(-DDNBD3_SERVER_AFL)
+
+    # change compiler for dnbd3-server sources if AFL enabled
+    include(CheckAFLCCompiler)
+    check_afl_c_compiler(AFL_C_COMPILER AFL_C_COMPILER_NAME ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ID})
+    if(AFL_C_COMPILER)
+        message(STATUS "Check for working AFL C compiler: ${AFL_C_COMPILER} - done")
+        # change C compiler to a corresponding AFL C compiler
+        set(CMAKE_C_COMPILER "${AFL_C_COMPILER}")
+    else(AFL_C_COMPILER)
+        # no corresponding AFL C compiler found
+        message(STATUS "Check for working AFL C compiler: ${AFL_C_COMPILER_NAME} - failed")
+        message(FATAL_ERROR "No corresponding AFL C compiler ${AFL_C_COMPILER_NAME} was found for the C compiler ${CMAKE_C_COMPILER}!")
+    endif(AFL_C_COMPILER)
 endif(DNBD3_SERVER_AFL)
 
 add_executable(dnbd3-server ${CMAKE_CURRENT_SOURCE_DIR}/altservers.c
-- 
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