dnsmasq: backport remove ping check of configured dhcp address

Remove ping check in DHCPDISCOVER case as too many buggy clients leave
an interface in configured state causing the ping check to fail.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/network/services/dnsmasq/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dnsmasq
 PKG_VERSION:=2.77
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://thekelleys.org.uk/dnsmasq/

package/network/services/dnsmasq/patches/011-Remove-ping-check-of-configured-DHCP-address.patch

@@ -0,0 +1,28 @@
+From 1d224949cced9e82440d00b3dbaf32c262bac2ff Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Sat, 8 Jul 2017 20:52:55 +0100
+Subject: [PATCH 1/2] Remove ping-check of configured DHCP address.
+
+This was added in 5ce3e76fbf89e942e8c54ef3e3389facf0d9067a but
+it trips over too many buggy clients that leave an interface configured
+even in DHCPDISCOVER case.
+---
+ src/rfc2131.c | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/src/rfc2131.c b/src/rfc2131.c
+index 86230b4..785e15c 100644
+--- a/src/rfc2131.c
++++ b/src/rfc2131.c
+@@ -1040,8 +1040,6 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
+ 		  else if (have_config(config, CONFIG_DECLINED) &&
+ 			   difftime(now, config->decline_time) < (float)DECLINE_BACKOFF)
+ 		    my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs);
+-		  else if ((!lease || lease->addr.s_addr != config->addr.s_addr) && !do_icmp_ping(now, config->addr, 0, loopback))
+-		    my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by another host"), addrs);
+ 		  else
+ 		    conf = config->addr;
+ 		}
+-- 
+2.13.2
+