From d3527ec67a9ddad9c189ae360d4f6181d5413bfa Mon Sep 17 00:00:00 2001
From: uhliarik <luhliari@redhat.com>
Date: Mon, 15 Jul 2019 03:42:39 +0000
Subject: [PATCH] Bug 4966: Lower cache_peer hostname (#420)

When parsing entries from /etc/hosts file, they are all lowered
(see bug 3040). If cache_peer hostname is uppercase, it will
lead to DNS resolution failure. Lowering cache_peer host fixes
this issue.

This change may expose broken Squid configurations that
incorrectly relied on non-lowercase peer host names to
bypass Squid's "is this cache_peer different from me?"
check. Though such configurations should encounter
forwarding loop errors later anyway.
---
 src/cache_cf.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/cache_cf.cc b/src/cache_cf.cc
index 8886b68..e6b231c 100644
--- a/src/cache_cf.cc
+++ b/src/cache_cf.cc
@@ -2075,7 +2075,7 @@ parse_peer(CachePeer ** head)
         self_destruct();
 
     p->host = xstrdup(token);
-
+    Tolower(p->host);
     p->name = xstrdup(token);
 
     if ((token = ConfigParser::NextToken()) == NULL)