From 3fef9d2d71eaae0b862f114fafc756b1706f0e6d Mon Sep 17 00:00:00 2001
From: Jernej Jakob <jernej.jakob@gmail.com>
Date: Fri, 8 May 2020 14:58:06 +0200
Subject: dhcp-server: T2438: change systemd service type, validate config file

The default of systemd services Type=simple isn't suitable for dhcpd and
other daemons.

- change service type to forking
- add RuntimeDirectory
- set paths to files in Environment
- set PIDFile
- validate config and lease file in ExecStartPre
- add -q to make dhcpd quiet and only log to syslog
- set Restart=always
---
 src/systemd/isc-dhcp-server.service | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/systemd/isc-dhcp-server.service b/src/systemd/isc-dhcp-server.service
index d848e3df1..e13c66dc6 100644
--- a/src/systemd/isc-dhcp-server.service
+++ b/src/systemd/isc-dhcp-server.service
@@ -6,14 +6,19 @@ ConditionPathExists=/run/dhcp-server/dhcpd.conf
 After=vyos-router.service
 
 [Service]
+Type=forking
 WorkingDirectory=/run/dhcp-server
-# The leases files need to be root:vyattacfg even when dropping privileges
-ExecStart=/bin/sh -ec '\
-    CONFIG_FILE=/run/dhcp-server/dhcpd.conf; \
-    [ -e /config/dhcpd.leases ] || touch /config/dhcpd.leases; \
-    chown root:vyattacfg /config/dhcpd.leases; \
-    chmod 664 /config/dhcpd.leases; \
-    exec /usr/sbin/dhcpd -user nobody -group nogroup -f -4 -pf /run/dhcp-server/dhcpd.pid -cf $CONFIG_FILE -lf /config/dhcpd.leases'
+RuntimeDirectory=dhcp-server
+RuntimeDirectoryPreserve=yes
+Environment=PID_FILE=/run/dhcp-server/dhcpd.pid CONFIG_FILE=/run/dhcp-server/dhcpd.conf LEASE_FILE=/config/dhcpd.leases
+PIDFile=/run/dhcp-server/dhcpd.pid
+ExecStartPre=/bin/sh -ec '\
+touch ${LEASE_FILE}; \
+chown nobody:nogroup ${LEASE_FILE}* ; \
+chmod 664 ${LEASE_FILE}* ; \
+/usr/sbin/dhcpd -4 -t -T -q -user nobody -group nogroup -pf ${PID_FILE} -cf ${CONFIG_FILE} -lf ${LEASE_FILE} '
+ExecStart=/usr/sbin/dhcpd -4 -q -user nobody -group nogroup -pf ${PID_FILE} -cf ${CONFIG_FILE} -lf ${LEASE_FILE}
+Restart=always
 
 [Install]
 WantedBy=multi-user.target
-- 
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