From 1d99026dbcf73d9bcf193ed15f87e0b3451ec7e2 Mon Sep 17 00:00:00 2001
From: hyung-hwan <hyunghwan.chung@gmail.com>
Date: Fri, 20 Nov 2015 03:12:07 +0000
Subject: [PATCH] enhanced awk to detected divide-by-zero error when folding
 constans

---
 qse/lib/awk/parse.c      | 17 ++++++++++++++++-
 qse/lib/http/httpd-std.c |  7 +++++--
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/qse/lib/awk/parse.c b/qse/lib/awk/parse.c
index 758aa4c7..61a0cf30 100644
--- a/qse/lib/awk/parse.c
+++ b/qse/lib/awk/parse.c
@@ -3364,6 +3364,12 @@ static int fold_constants_for_binop (
 				break;
 
 			case QSE_AWK_BINOP_DIV:
+				if (((qse_awk_nde_int_t*)right)->val == 0)
+				{
+					qse_awk_seterrnum (awk, QSE_AWK_EDIVBY0, QSE_NULL);
+					return QSE_NULL;
+				}
+
 				if (INT_BINOP_INT(left,%,right))
 				{
 					folded->r = (qse_awk_flt_t)((qse_awk_nde_int_t*)left)->val / 
@@ -3371,8 +3377,17 @@ static int fold_constants_for_binop (
 					fold = QSE_AWK_NDE_FLT;
 					break;
 				}
-				/* fall through here */
+
+				folded->l = INT_BINOP_INT(left,/,right);
+				break;
+
 			case QSE_AWK_BINOP_IDIV:
+				if (((qse_awk_nde_int_t*)right)->val == 0)
+				{
+					qse_awk_seterrnum (awk, QSE_AWK_EDIVBY0, QSE_NULL);
+					return QSE_NULL;
+				}
+
 				folded->l = INT_BINOP_INT(left,/,right);
 				break;
 
diff --git a/qse/lib/http/httpd-std.c b/qse/lib/http/httpd-std.c
index 01d8908c..6c5d47e0 100644
--- a/qse/lib/http/httpd-std.c
+++ b/qse/lib/http/httpd-std.c
@@ -1174,11 +1174,14 @@ static int server_accept (
 		 * the same addresses. however, the port number may be different
 		 * as a typical TPROXY rule is set to change the port number.
 		 * However, this check is fragile if the server port number is
-		 * set to 0. */
+		 * set to 0. 
+		 *
+		 * Take note that if the TPROXY rule doesn't change the port 
+		 * number the above assumption gets wrong. so it won't be able
+		 * to handle such a TPROXYed packet without port transformation. */
 		client->status |= QSE_HTTPD_CLIENT_INTERCEPTED;
 	}
 	#if 0
-/* TODO: how to set intercepted when TPROXY is used? */
 	else if ((client->initial_ifindex = resolve_ifindex (fd, client->local_addr)) <= -1)
 	{
 		/* the local_address is not one of a local address.