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Merged
Easton97-Jens merged 5 commits into from
Apr 8, 2026
Merged

Add internal JSON backend layer, autotools integration and backend placeholders #53

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121ccb9
Implement functional json-c and nlohmann walkers with improved config…
Easton97-Jens Apr 8, 2026
aff8403
Fix JSON backend selection robustness and generator correctness
Easton97-Jens Apr 8, 2026
f4380f2
Fix build bootstrap and JSON generator/backend integration issues
Easton97-Jens Apr 8, 2026
cbb0756
Fix backend resolver semantics and harden JSON UTF-8 escaping
Easton97-Jens Apr 8, 2026
3697f57
Fix JSON support gating with YAJL and tighten resolver tests
Easton97-Jens Apr 8, 2026
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326 changes: 325 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,320 @@ PROG_YAJL

AM_CONDITIONAL([YAJL_VERSION], [test "$YAJL_VERSION" != ""])

AC_ARG_WITH([json-c],
[AS_HELP_STRING([--with-json-c=auto|yyjson|json-c|jansson|cjson|none],
[Select the C JSON backend (default: auto)])],
[with_json_c="$withval"], [with_json_c="auto"])

AC_ARG_WITH([json-cxx],
[AS_HELP_STRING([--with-json-cxx=auto|nlohmannjson|jsoncpp|jsoncons|simdjson|glaze|none],
[Select the C++ JSON backend (default: auto)])],
[with_json_cxx="$withval"], [with_json_cxx="auto"])

AC_ARG_WITH([json-prefer],
[AS_HELP_STRING([--with-json-prefer=system|bundled|auto],
[Prefer system or bundled JSON dependencies when both are available (default: auto)])],
[with_json_prefer="$withval"], [with_json_prefer="auto"])

AC_ARG_WITH([json-mode],
[AS_HELP_STRING([--with-json-mode=auto|dom|events],
[Preferred internal JSON mode (default: auto)])],
[with_json_mode="$withval"], [with_json_mode="auto"])

AC_ARG_ENABLE([json-backend-debug],
[AS_HELP_STRING([--enable-json-backend-debug],
[Enable JSON backend debug traces and checks])],
[enable_json_backend_debug="$enableval"], [enable_json_backend_debug="no"])

case "x$with_json_prefer" in
xsystem|xbundled|xauto) ;;
*) AC_MSG_ERROR([Invalid value for --with-json-prefer: $with_json_prefer]) ;;
esac

case "x$with_json_mode" in
xauto|xdom|xevents) ;;
*) AC_MSG_ERROR([Invalid value for --with-json-mode: $with_json_mode]) ;;
esac

JSON_BACKEND_CFLAGS=""
JSON_BACKEND_LDADD=""
JSON_BACKEND_LDFLAGS=""
JSON_C_BACKEND_SOURCE=""
JSON_CXX_BACKEND_SOURCE=""
JSON_C_BACKEND=""
JSON_CXX_BACKEND="none"

AC_MSG_NOTICE([Resolving C JSON backend (${with_json_c})])
case "x$with_json_c" in
xauto)
_msc_json_c_order="yyjson json-c jansson cjson"
if test "x$with_json_prefer" = "xbundled"; then
if test -f "${srcdir}/third_party/json-c/include/json-c/json.h"; then
JSON_C_BACKEND="json-c"
JSON_C_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="-I\$(top_srcdir)/third_party/json-c/include"
fi
fi
for _msc_cand in $_msc_json_c_order; do
if test "x$JSON_C_BACKEND" != "x"; then
break
fi
case "$_msc_cand" in
yyjson)
MSC_CHECK_LIB([YYJSON], [yyjson], [yyjson.h], [yyjson], [])
if test "x$YYJSON_FOUND" = "x1"; then
JSON_C_BACKEND="yyjson"
JSON_BACKEND_CFLAGS="$YYJSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$YYJSON_LDFLAGS"
JSON_BACKEND_LDADD="$YYJSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
json-c)
MSC_CHECK_LIB([JSONC], [json-c], [json-c/json.h], [json-c], [-DWITH_JSON_C])
if test "x$JSONC_FOUND" = "x1"; then
JSON_C_BACKEND="json-c"
JSON_BACKEND_CFLAGS="$JSONC_CFLAGS"
JSON_BACKEND_LDFLAGS="$JSONC_LDFLAGS"
JSON_BACKEND_LDADD="$JSONC_LDADD"
JSON_C_BACKEND_SOURCE="system"
elif test "x$with_json_prefer" != "xsystem" && test -f "${srcdir}/third_party/json-c/include/json-c/json.h"; then
JSON_C_BACKEND="json-c"
JSON_C_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="-I\$(top_srcdir)/third_party/json-c/include"
fi
;;
jansson)
MSC_CHECK_LIB([JANSSON], [jansson], [jansson.h], [jansson], [])
if test "x$JANSSON_FOUND" = "x1"; then
JSON_C_BACKEND="jansson"
JSON_BACKEND_CFLAGS="$JANSSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$JANSSON_LDFLAGS"
JSON_BACKEND_LDADD="$JANSSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
cjson)
MSC_CHECK_LIB([CJSON], [libcjson cjson], [cjson/cJSON.h], [cjson], [])
if test "x$CJSON_FOUND" = "x1"; then
JSON_C_BACKEND="cjson"
JSON_BACKEND_CFLAGS="$CJSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$CJSON_LDFLAGS"
JSON_BACKEND_LDADD="$CJSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
esac
done
if test "x$JSON_C_BACKEND" = "x"; then
JSON_C_BACKEND="none"
JSON_C_BACKEND_SOURCE="disabled"
fi
;;
xyyjson|xjson-c|xjansson|xcjson)
_msc_explicit_c="$with_json_c"
if test "x$with_json_prefer" = "xbundled" && test "x$_msc_explicit_c" = "xjson-c"; then
if test -f "${srcdir}/third_party/json-c/include/json-c/json.h"; then
JSON_C_BACKEND="json-c"
JSON_C_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="-I\$(top_srcdir)/third_party/json-c/include"
else
AC_MSG_ERROR([Vendored json-c selected but headers missing: third_party/json-c/include/json-c/json.h])
fi
fi
if test "x$JSON_C_BACKEND" = "x"; then
case "$_msc_explicit_c" in
yyjson)
MSC_CHECK_LIB([YYJSON], [yyjson], [yyjson.h], [yyjson], [])
if test "x$YYJSON_FOUND" = "x1"; then
JSON_C_BACKEND="yyjson"
JSON_BACKEND_CFLAGS="$YYJSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$YYJSON_LDFLAGS"
JSON_BACKEND_LDADD="$YYJSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
json-c)
MSC_CHECK_LIB([JSONC], [json-c], [json-c/json.h], [json-c], [-DWITH_JSON_C])
if test "x$JSONC_FOUND" = "x1"; then
JSON_C_BACKEND="json-c"
JSON_BACKEND_CFLAGS="$JSONC_CFLAGS"
JSON_BACKEND_LDFLAGS="$JSONC_LDFLAGS"
JSON_BACKEND_LDADD="$JSONC_LDADD"
JSON_C_BACKEND_SOURCE="system"
elif test "x$with_json_prefer" != "xsystem" && test -f "${srcdir}/third_party/json-c/include/json-c/json.h"; then
JSON_C_BACKEND="json-c"
JSON_C_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="-I\$(top_srcdir)/third_party/json-c/include"
fi
;;
jansson)
MSC_CHECK_LIB([JANSSON], [jansson], [jansson.h], [jansson], [])
if test "x$JANSSON_FOUND" = "x1"; then
JSON_C_BACKEND="jansson"
JSON_BACKEND_CFLAGS="$JANSSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$JANSSON_LDFLAGS"
JSON_BACKEND_LDADD="$JANSSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
cjson)
MSC_CHECK_LIB([CJSON], [libcjson cjson], [cjson/cJSON.h], [cjson], [])
if test "x$CJSON_FOUND" = "x1"; then
JSON_C_BACKEND="cjson"
JSON_BACKEND_CFLAGS="$CJSON_CFLAGS"
JSON_BACKEND_LDFLAGS="$CJSON_LDFLAGS"
JSON_BACKEND_LDADD="$CJSON_LDADD"
JSON_C_BACKEND_SOURCE="system"
fi
;;
esac
fi
if test "x$JSON_C_BACKEND" = "x"; then
AC_MSG_ERROR([Requested C JSON backend '$with_json_c' is not available with current --with-json-prefer=${with_json_prefer}.])
fi
;;
xnone)
JSON_C_BACKEND="none"
JSON_C_BACKEND_SOURCE="disabled"
;;
*)
AC_MSG_ERROR([Invalid value for --with-json-c: $with_json_c])
;;
esac

case "x$JSON_C_BACKEND" in
xyyjson) JSON_C_BACKEND_DEFINE="-DMSC_JSON_C_BACKEND_YYJSON" ;;
xjson-c) JSON_C_BACKEND_DEFINE="-DMSC_JSON_C_BACKEND_JSONC" ;;
xjansson) JSON_C_BACKEND_DEFINE="-DMSC_JSON_C_BACKEND_JANSSON" ;;
xcjson) JSON_C_BACKEND_DEFINE="-DMSC_JSON_C_BACKEND_CJSON" ;;
xnone) JSON_C_BACKEND_DEFINE="-DMSC_JSON_C_BACKEND_NONE" ;;
esac
if test "x$JSON_C_BACKEND_SOURCE" = "xsystem"; then
JSON_C_BACKEND_DEFINE="$JSON_C_BACKEND_DEFINE -DMSC_JSON_C_BACKEND_SYSTEM"
elif test "x$JSON_C_BACKEND_SOURCE" = "xvendored"; then
JSON_C_BACKEND_DEFINE="$JSON_C_BACKEND_DEFINE -DMSC_JSON_C_BACKEND_VENDORED"
fi

AC_MSG_NOTICE([Resolving C++ JSON backend (${with_json_cxx})])
JSON_CXX_BACKEND="none"
JSON_CXX_BACKEND_SOURCE="disabled"
case "x$with_json_cxx" in
xauto)
if test "x$with_json_prefer" = "xbundled" && test -f "${srcdir}/third_party/nlohmann_json/include/nlohmann/json.hpp"; then
JSON_CXX_BACKEND="nlohmannjson"
JSON_CXX_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -I\$(top_srcdir)/third_party/nlohmann_json/include"
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([simdjson.h], [JSON_CXX_BACKEND="simdjson"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([nlohmann/json.hpp], [JSON_CXX_BACKEND="nlohmannjson"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([jsoncons/json.hpp], [JSON_CXX_BACKEND="jsoncons"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([json/json.h], [JSON_CXX_BACKEND="jsoncpp"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([glaze/glaze.hpp], [JSON_CXX_BACKEND="glaze"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone" && test "x$with_json_prefer" != "xsystem" && test -f "${srcdir}/third_party/nlohmann_json/include/nlohmann/json.hpp"; then

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P1 Badge Honor explicit --with-json-cxx backend requests

When an explicit C++ backend is requested (for example --with-json-cxx=jsoncpp) and that backend is not found, this fallback still picks vendored nlohmann if --with-json-prefer is not system. Because third_party/nlohmann_json/include/nlohmann/json.hpp is shipped in-tree, configure succeeds instead of reaching the explicit-request failure path, so builds can silently use a different backend than the one the user asked for.

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JSON_CXX_BACKEND="nlohmannjson"
JSON_CXX_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -I\$(top_srcdir)/third_party/nlohmann_json/include"
fi
;;
xsimdjson|xnlohmannjson|xjsoncons|xjsoncpp|xglaze)
_msc_explicit_cxx="$with_json_cxx"
if test "x$_msc_explicit_cxx" = "xnlohmannjson"; then
if test "x$with_json_prefer" = "xbundled"; then
if test -f "${srcdir}/third_party/nlohmann_json/include/nlohmann/json.hpp"; then
JSON_CXX_BACKEND="nlohmannjson"
JSON_CXX_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -I\$(top_srcdir)/third_party/nlohmann_json/include"
else
AC_MSG_ERROR([Vendored nlohmann/json selected but header missing: third_party/nlohmann_json/include/nlohmann/json.hpp])
fi
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_CHECK_HEADER([nlohmann/json.hpp], [JSON_CXX_BACKEND="nlohmannjson"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone" && test "x$with_json_prefer" != "xsystem" && test -f "${srcdir}/third_party/nlohmann_json/include/nlohmann/json.hpp"; then
JSON_CXX_BACKEND="nlohmannjson"
JSON_CXX_BACKEND_SOURCE="vendored"
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -I\$(top_srcdir)/third_party/nlohmann_json/include"
fi
elif test "x$_msc_explicit_cxx" = "xsimdjson"; then
AC_CHECK_HEADER([simdjson.h], [JSON_CXX_BACKEND="simdjson"; JSON_CXX_BACKEND_SOURCE="system"])
elif test "x$_msc_explicit_cxx" = "xjsoncons"; then
AC_CHECK_HEADER([jsoncons/json.hpp], [JSON_CXX_BACKEND="jsoncons"; JSON_CXX_BACKEND_SOURCE="system"])
elif test "x$_msc_explicit_cxx" = "xjsoncpp"; then
AC_CHECK_HEADER([json/json.h], [JSON_CXX_BACKEND="jsoncpp"; JSON_CXX_BACKEND_SOURCE="system"])
elif test "x$_msc_explicit_cxx" = "xglaze"; then
AC_CHECK_HEADER([glaze/glaze.hpp], [JSON_CXX_BACKEND="glaze"; JSON_CXX_BACKEND_SOURCE="system"])
fi
if test "x$JSON_CXX_BACKEND" = "xnone"; then
AC_MSG_ERROR([Requested C++ JSON backend '$with_json_cxx' is not available with current --with-json-prefer=${with_json_prefer}.])
fi
;;
xnone)
;;
*)
AC_MSG_ERROR([Invalid value for --with-json-cxx: $with_json_cxx])
;;
esac

case "x$JSON_CXX_BACKEND" in
xsimdjson) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_SIMDJSON" ;;
xnlohmannjson) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_NLOHMANNJSON" ;;
xjsoncons) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_JSONCONS" ;;
xjsoncpp) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_JSONCPP" ;;
xglaze) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_GLAZE" ;;
*) JSON_CXX_BACKEND_DEFINE="-DMSC_JSON_CXX_BACKEND_NONE" ;;
esac
if test "x$JSON_CXX_BACKEND_SOURCE" = "xsystem"; then
JSON_CXX_BACKEND_DEFINE="$JSON_CXX_BACKEND_DEFINE -DMSC_JSON_CXX_BACKEND_SYSTEM"
elif test "x$JSON_CXX_BACKEND_SOURCE" = "xvendored"; then
JSON_CXX_BACKEND_DEFINE="$JSON_CXX_BACKEND_DEFINE -DMSC_JSON_CXX_BACKEND_VENDORED"
fi

if test "x$JSON_C_BACKEND" != "xnone"; then
AC_DEFINE([WITH_JSON_SUPPORT], [1], [Define if a JSON backend is enabled for JSON generation])
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS $JSON_C_BACKEND_DEFINE $JSON_CXX_BACKEND_DEFINE -DWITH_JSON_SUPPORT"
Comment on lines +397 to +410

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P1 Badge Keep JSON support enabled when YAJL is the only backend

This gate disables WITH_JSON_SUPPORT whenever JSON_C_BACKEND resolves to none, but the new resolver never includes YAJL in its C-backend candidates. In environments that only have YAJL (a common existing setup), --with-json-c=auto now resolves to none, so Transaction::toJSON and ModSecurity::processContentOffset are compiled out and return the "not compiled with JSON support" path despite YAJL being present. That is a functional regression from the previous YAJL-based JSON generation behavior.

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else
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS $JSON_C_BACKEND_DEFINE $JSON_CXX_BACKEND_DEFINE"
fi

AC_SUBST([JSON_BACKEND_CFLAGS])
AC_SUBST([JSON_BACKEND_LDADD])
AC_SUBST([JSON_BACKEND_LDFLAGS])
AC_SUBST([JSON_C_BACKEND])
AC_SUBST([JSON_C_BACKEND_SOURCE])
AC_SUBST([JSON_CXX_BACKEND])
AC_SUBST([JSON_CXX_BACKEND_SOURCE])
AC_SUBST([JSON_PREFER_MODE], [$with_json_prefer])
AC_SUBST([JSON_OPERATING_MODE], [$with_json_mode])

if test "x$enable_json_backend_debug" = "xyes"; then
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -DMSC_JSON_BACKEND_DEBUG=1"
AC_DEFINE([MSC_JSON_BACKEND_DEBUG], [1], [Define to enable JSON backend debug logging])
fi

case "x$with_json_mode" in
xdom)
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -DMSC_JSON_MODE_DOM=1"
;;
xevents)
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -DMSC_JSON_MODE_EVENTS=1"
;;
*)
JSON_BACKEND_CFLAGS="$JSON_BACKEND_CFLAGS -DMSC_JSON_MODE_AUTO=1"
;;
esac

# Check for LibGeoIP
PROG_GEOIP

Expand Down Expand Up @@ -452,6 +766,17 @@ fi

MSC_STATUS_LIB([LibCURL ], [CURL])
MSC_STATUS_LIB([YAJL ], [YAJL])
echo " + JSON C backend ....${JSON_C_BACKEND} (${JSON_C_BACKEND_SOURCE})"
echo " + JSON C++ backend ....${JSON_CXX_BACKEND} (${JSON_CXX_BACKEND_SOURCE})"
echo " + JSON backend ....${JSON_C_BACKEND} (${JSON_C_BACKEND_SOURCE})"
echo " + JSON C++ backend (effective) ....${JSON_CXX_BACKEND} (${JSON_CXX_BACKEND_SOURCE})"
echo " + JSON preference ....${with_json_prefer}"
echo " + JSON mode ....${with_json_mode}"
if test "x$enable_json_backend_debug" = "xyes"; then
echo " + JSON backend debug ....enabled"
else
echo " + JSON backend debug ....disabled"
fi
MSC_STATUS_LIB([LMDB ], [LMDB])
MSC_STATUS_LIB([LibXML2 ], [LIBXML2])
MSC_STATUS_LIB([SSDEEP ], [SSDEEP])
Expand Down Expand Up @@ -532,4 +857,3 @@ if test "$aflFuzzer" = "true"; then
echo " $ export CC=afl-clang-fast "
echo " "
fi

12 changes: 12 additions & 0 deletions docs/json-backends/autotools-integration.md
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@@ -0,0 +1,12 @@
# Moved documentation
# Verschobene Dokumentation

## English
This document moved. Please see:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`

## Deutsch
Dieses Dokument wurde verschoben. Siehe:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`
12 changes: 12 additions & 0 deletions docs/json-backends/backend-cjson.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
# Moved documentation
# Verschobene Dokumentation

## English
This document moved. Please see:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`

## Deutsch
Dieses Dokument wurde verschoben. Siehe:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`
12 changes: 12 additions & 0 deletions docs/json-backends/backend-glaze.md
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@@ -0,0 +1,12 @@
# Moved documentation
# Verschobene Dokumentation

## English
This document moved. Please see:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`

## Deutsch
Dieses Dokument wurde verschoben. Siehe:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`
12 changes: 12 additions & 0 deletions docs/json-backends/backend-jansson.md
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@@ -0,0 +1,12 @@
# Moved documentation
# Verschobene Dokumentation

## English
This document moved. Please see:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`

## Deutsch
Dieses Dokument wurde verschoben. Siehe:
- `docs/json-backends/build.md`
- `docs/json-backends/backends/`
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