package/nginx-naxsi: fix build without x_forwarded_for

Fix the following build failure without x_forwarded_for raised since
bump to version 1.3 in commit 3335c8d8685119ebb5b2a9a6e575f3a5337c4d90:

/home/buildroot/autobuild/instance-3/output-1/build/nginx-naxsi-1.3/naxsi_src/naxsi_runtime.c: In function 'ngx_http_naxsi_data_parse':
/home/buildroot/autobuild/instance-3/output-1/build/nginx-naxsi-1.3/naxsi_src/naxsi_runtime.c:2846:20: error: 'ngx_http_headers_in_t' has no member named 'x_forwarded_for'
   if (r->headers_in.x_forwarded_for.nelts >= 1) {
                    ^

Fixes:
 - http://autobuild.buildroot.org/results/cdbc1536f6b5de3d4c836efa2f0dcaf0cdbb1462

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/nginx-naxsi/0001-naxsi_src-naxsi_runtime.c-fix-build-without-x_forwar.patch

@@ -0,0 +1,63 @@
+From 8ea5218b07f715e9616a846bf305633ef1b3aa2a Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sat, 14 Aug 2021 11:46:08 +0200
+Subject: [PATCH] naxsi_src/naxsi_runtime.c: fix build without x_forwarded_for
+
+x_forwarded_for is not available if realip, geo, geoip or proxy modules
+aren't enabled resulting in the following build failure since version
+1.1a and
+https://github.com/nbs-system/naxsi/commit/07a056ccd36bc3c5c40dc17991db226cb8cf6241:
+
+/home/buildroot/autobuild/instance-3/output-1/build/nginx-naxsi-1.3/naxsi_src/naxsi_runtime.c: In function 'ngx_http_naxsi_data_parse':
+/home/buildroot/autobuild/instance-3/output-1/build/nginx-naxsi-1.3/naxsi_src/naxsi_runtime.c:2846:20: error: 'ngx_http_headers_in_t' has no member named 'x_forwarded_for'
+   if (r->headers_in.x_forwarded_for.nelts >= 1) {
+                    ^
+
+Fixes:
+ - http://autobuild.buildroot.org/results/cdbc1536f6b5de3d4c836efa2f0dcaf0cdbb1462
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/nbs-system/naxsi/pull/568]
+---
+ naxsi_src/naxsi_runtime.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/naxsi_src/naxsi_runtime.c b/naxsi_src/naxsi_runtime.c
+index 28e0b29..6a723d2 100644
+--- a/naxsi_src/naxsi_runtime.c
++++ b/naxsi_src/naxsi_runtime.c
+@@ -2842,10 +2842,12 @@ ngx_http_naxsi_data_parse(ngx_http_request_ctx_t* ctx, ngx_http_request_t* r)
+   unsigned int      n = 0;
+   ngx_table_elt_t** h = NULL;
+   ngx_array_t       a;
++#if (NGX_HTTP_X_FORWARDED_FOR)
+   if (r->headers_in.x_forwarded_for.nelts >= 1) {
+     a = r->headers_in.x_forwarded_for;
+     n = a.nelts;
+   }
++#endif
+   if (n >= 1)
+     h = a.elts;
+   if (n >= 1) {
+@@ -2879,6 +2881,7 @@ ngx_http_naxsi_update_current_ctx_status(ngx_http_request_ctx_t*    ctx,
+ 
+   /*cr, sc, cf, ctx*/
+   if (cf->check_rules && ctx->special_scores) {
++#if (NGX_HTTP_X_FORWARDED_FOR)
+     if (r->headers_in.x_forwarded_for.nelts >= 1) {
+       a = r->headers_in.x_forwarded_for;
+       n = a.nelts;
+@@ -2896,7 +2899,9 @@ ngx_http_naxsi_update_current_ctx_status(ngx_http_request_ctx_t*    ctx,
+         memcpy(ip.data, h[0]->value.data, ip.len);
+         ignore = nx_can_ignore_ip(&ip, cf) || nx_can_ignore_cidr(&ip, cf);
+       }
+-    } else {
++    } else
++#endif
++    {
+       ngx_str_t* ip = &r->connection->addr_text;
+       NX_DEBUG(_debug_whitelist_ignore,
+                NGX_LOG_DEBUG_HTTP,
+-- 
+2.30.2
+