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From 18eac67c0a15b673c8d27002c248651b308093e4 Mon Sep 17 00:00:00 2001
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From: Steven Siloti <ssiloti@gmail.com>
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Date: Sun, 13 Jan 2019 22:56:36 +0000
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Subject: [PATCH 30/32] Fix entries in /etc/hosts disabling static leases.
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It is possible for a config entry to have one address family specified by a
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dhcp-host directive and the other added from /etc/hosts. This is especially
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common on OpenWrt because it uses odhcpd for DHCPv6 and IPv6 leases are
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imported into dnsmasq via a hosts file.
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To handle this case there need to be separate *_HOSTS flags for IPv4 and IPv6.
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Otherwise when the hosts file is reloaded it will clear the CONFIG_ADDR(6) flag
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which was set by the dhcp-host directive.
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Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
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---
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src/dhcp-common.c | 8 ++++++--
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src/dnsmasq.h | 1 +
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2 files changed, 7 insertions(+), 2 deletions(-)
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--- a/src/dhcp-common.c
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+++ b/src/dhcp-common.c
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@@ -372,7 +372,11 @@ void dhcp_update_configs(struct dhcp_con
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for (config = configs; config; config = config->next)
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if (config->flags & CONFIG_ADDR_HOSTS)
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- config->flags &= ~(CONFIG_ADDR | CONFIG_ADDR6 | CONFIG_ADDR_HOSTS);
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+ config->flags &= ~(CONFIG_ADDR | CONFIG_ADDR_HOSTS);
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+#ifdef HAVE_DHCP6
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+ if (config->flags & CONFIG_ADDR6_HOSTS)
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+ config->flags &= ~(CONFIG_ADDR6 | CONFIG_ADDR6_HOSTS);
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+#endif
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#ifdef HAVE_DHCP6
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again:
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@@ -421,7 +425,7 @@ void dhcp_update_configs(struct dhcp_con
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(!(conf_tmp = config_find_by_address6(configs, &crec->addr.addr6, 128, 0)) || conf_tmp == config))
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{
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memcpy(&config->addr6, &crec->addr.addr6, IN6ADDRSZ);
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- config->flags |= CONFIG_ADDR6 | CONFIG_ADDR_HOSTS;
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+ config->flags |= CONFIG_ADDR6 | CONFIG_ADDR6_HOSTS;
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continue;
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}
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#endif
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--- a/src/dnsmasq.h
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+++ b/src/dnsmasq.h
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@@ -789,6 +789,7 @@ struct dhcp_config {
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#define CONFIG_BANK 2048 /* from dhcp hosts file */
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#define CONFIG_ADDR6 4096
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#define CONFIG_WILDCARD 8192
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+#define CONFIG_ADDR6_HOSTS 16384 /* address added by from /etc/hosts */
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struct dhcp_opt {
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int opt, len, flags;
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