From 57330da9a1ccb53bab15b92f2e4568e42db1fad5 Mon Sep 17 00:00:00 2001
From: Felipe Zimmerle <felipe@zimmerle.org>
Date: Wed, 18 Sep 2013 09:19:41 -0300
Subject: [PATCH] nginx: Makes the build script to check for deps

The ModSecurity module has some dependencies that may not be part
of the Nginx build, and so it is not part of the configuration
options. In order to resolve this dependencies automatically this
`config' is now making use of the pkg-config, utility that is
popular to make this compatible layer between different Linux
distributions and operational systems.
---
 nginx/modsecurity/config | 80 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 4 deletions(-)

diff --git a/nginx/modsecurity/config b/nginx/modsecurity/config
index a77538ba..f0bf507a 100644
--- a/nginx/modsecurity/config
+++ b/nginx/modsecurity/config
@@ -1,7 +1,79 @@
+#!/bin/sh
+
+dependencies='apr-1 apr-util-1 libxml-2.0'
+
+if [ ! -e "$ngx_addon_dir/../../standalone/.libs/standalone.a" ]
+then
+  echo "Aborting. ModSecurity must be compiled with \
+--enable-standalone-module option prior to the Nginx compilation."
+  exit 1
+fi
+
+echo -n "Checking for Apache headers using apx2... "
+apache_include_dir=`apxs2 -q INCLUDEDIR 2> /dev/null`
+RETVAL=$?
+if [ $RETVAL -eq 0 ]
+then
+  CORE_INCS="$CORE_INCS $apache_include_dir"
+  echo "Ok"
+else
+  echo "FAIL"
+  echo "Aborting. Apache apx2 is not installed or fails to point\
+Apache headers."
+  exit 1;
+fi
+
+missing=""
+for element in $dependencies;
+do
+  echo -n "Checking for $element... ";
+
+  cflags=`pkg-config --cflags-only-I $element 2> /dev/null | sed -s 's/-I//'`
+  libs=`pkg-config --libs $element 2> /dev/null`
+  RETVAL=$?
+
+  if [ $RETVAL -eq 0 ]
+  then
+    CORE_INCS="$CORE_INCS $cflags"
+    CORE_LIBS="$CORE_LIBS $libs"
+    echo "Ok"
+  else
+    echo "FAIL"
+    missing="$missing $element"
+  fi
+done
+
+if [ ! -z $missing ]
+then
+  echo "Aborting. Following dependencies are missing: $missing"
+  exit 1
+fi
+
+if [ $USE_PCRE = DISABLED ]
+then
+  echo "Aborting. PCRE support must be enabled on Nginx compilation"
+  exit 1
+fi
+
 ngx_addon_name=ngx_http_modsecurity
+
 CORE_MODULES="$CORE_MODULES ngx_pool_context_module"
+
 HTTP_AUX_FILTER_MODULES="ngx_http_modsecurity $HTTP_AUX_FILTER_MODULES"
-NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_modsecurity.c $ngx_addon_dir/apr_bucket_nginx.c $ngx_addon_dir/ngx_pool_context.c"
-NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/apr_bucket_nginx.h $ngx_addon_dir/ngx_pool_context.h"
-CORE_LIBS="$CORE_LIBS $ngx_addon_dir/../../standalone/.libs/standalone.a -L/usr/local/apr/lib -lapr-1  -L/usr/local/apr/lib -laprutil-1 -lpcre -lxml2 -lz -lm -ldl  "
-CORE_INCS="$CORE_INCS $ngx_addon_dir $ngx_addon_dir/../../standalone $ngx_addon_dir/../../apache2 /usr/include/libxml2  /usr/local/apache2/include /usr/local/apr/include/apr-1 /usr/local/apr/include/apr-1"
+
+NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
+		$ngx_addon_dir/ngx_http_modsecurity.c \
+		$ngx_addon_dir/apr_bucket_nginx.c \
+		$ngx_addon_dir/ngx_pool_context.c"
+
+NGX_ADDON_DEPS="$NGX_ADDON_DEPS \
+		$ngx_addon_dir/apr_bucket_nginx.h \
+		$ngx_addon_dir/ngx_pool_context.h"
+
+CORE_LIBS="$ngx_addon_dir/../../standalone/.libs/standalone.a $CORE_LIBS"
+
+CORE_INCS="$CORE_INCS \
+	$ngx_addon_dir \
+	$ngx_addon_dir/../../standalone \
+	$ngx_addon_dir/../../apache2"
+