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freenetis-dhcp-github/freenetis-dhcp-sync.sh @ master

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#!/bin/bash
################################################################################
# #
# Author: Michal Kliment #
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# Description: This script generates config file of DHCP server #
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# from FreenetIS #
# #
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# Version: 0.1.3 #
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# #
################################################################################

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# Version
VERSION="0.1.3"

# Variables
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CONFIG=/etc/freenetis/freenetis-dhcp.conf
FORCED=1

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# Vesion info? Only possible arg.
if [ $# -eq 1 ]; then
if [ "$1" == "version" ]; then
echo "$VERSION"
exit 0
fi
fi

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# Load variables
if [ -e $CONFIG ]; then
. $CONFIG || true
else
echo "`date -R` Config file is missing at path $CONFIG. Terminating..."
exit 0
fi

# check config
if [[ ! "$DEVICE_ID" =~ ^[0-9]+$ ]] || [ $DEVICE_ID -lt 1 ]; then
echo "[ERROR] `date -R` Wrong configuration (ID not set properly)"
exit 1
fi

if [[ ! "$TIMEOUT" =~ ^[0-9]+$ ]] || [ $TIMEOUT -lt 1 ]; then
echo "[ERROR] `date -R` Wrong configuration (TIMEOUT not set properly)"
exit 1
fi

c988d1b0 Michal Kliment
# for old config backward compatibility
if [[ -z "$SERVER" && "$FULL_PATH" == *"etc-dhcp-dhcpd"* ]];
then
SERVER="isc-dhcp"
fi

# DHCP server is old ISC DHCP
if [[ "$SERVER" == "isc-dhcp" ]];
then
DHCP_CONF=${DHCP_CONF:="/etc/dhcp/dhcp.conf"}
CUSTOM_DHCP_CONF=${CUSTOM_DHCP_CONF:="/etc/dhcp/dhcp.conf.custom"}
FULL_PATH=$PATH_FN"/index.php/en/devices/export/"$DEVICE_ID"/debian-etc-dhcp-dhcpd/text"
# DHCP server is newer ISC KEA
elif [[ "$SERVER" == "isc-kea" ]];
then
DHCP_CONF=${DHCP_CONF:="/etc/kea/kea-dhcp4.conf"}
# custom dhcp config is not possible for ISC KEA
CUSTOM_DHCP_CONF=""
FULL_PATH=$PATH_FN"/index.php/en/devices/export/"$DEVICE_ID"/debian-etc-kea-kea-dhcp4/text"
# another DHCP servers are not implemented yet
else
echo "[ERROR] `date -R` Wrong configuration (SERVER not set properly)"
exit 1
fi

# test downloaded config
test_config ()
{
if [[ "$SERVER" == "isc-dhcp" ]];
then
dhcpd -4 -t -cf "$TMPFILE" &>/dev/null
elif [[ "$SERVER" == "isc-kea" ]];
then
kea-dhcp4 -t "$TMPFILE" &>/dev/null
fi
}

e80eb689 Michal Kliment
# restart DHCP server and test PID
restart_dhcp ()
{
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if [[ "$SERVER" == "isc-dhcp" ]];
then
killall -w dhcpd 2>/dev/null
dhcpd -4 -q -cf "$DHCP_CONF"
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pidof -q dhcpd
elif [[ "$SERVER" == "isc-kea" ]];
then
if pidof -q kea-dhcp4;
then
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killall -w -s SIGHUP kea-dhcp4 2>/dev/null
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else
systemctl start isc-kea-dhcp4-server.service
fi

pidof -q kea-dhcp4
fi
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}

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# endless loop
while true;
do
#path
if [ "$FORCED" = 1 ]; then # forced download (#474)
DOWN_PATH="$FULL_PATH/1"
FORCED=0
else
DOWN_PATH="$FULL_PATH"
fi
# download
TMPFILE=`mktemp`
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echo "[INFO] `date -R` Downloading DHCP SERVER config from (${PATH_FN})"
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status=`curl -s -o "$TMPFILE" -w "%{http_code}" "$DOWN_PATH"`
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# make sure that config exist
touch "$DHCP_CONF"

# check download
if [ "$status" = "200" ]; then
# attach custom conf if exists
if [ -r "$CUSTOM_DHCP_CONF" ]; then
cat "$CUSTOM_DHCP_CONF" >> "$TMPFILE"
fi
# config has been change
if [ `diff "$TMPFILE" "$DHCP_CONF" | wc -l` -gt 0 ]; then
echo "[INFO] `date -R` Downloaded (code: $status)"
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echo "[INFO] `date -R` Testing new config..."
# new config is valid
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if test_config;
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then
echo "[INFO] `date -R` New config is valid"
echo "[INFO] `date -R` Backuping old config to $DHCP_CONF.save"
mv -f "$DHCP_CONF" "$DHCP_CONF".save
echo "[INFO] `date -R` Loading new config to $DHCP_CONF.save..."
# copy config
mv -f "$TMPFILE" "$DHCP_CONF"
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# make readable for all
chmod +r "$DHCP_CONF"
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# restart DHCP server with new configuration
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echo "[INFO] `date -R` Restarting DHCP server"
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if ! restart_dhcp;
then
echo "[ERROR] `date -R` DHCP server is not running -> keeping old configuration"
mv -f "$DHCP_CONF".save "$DHCP_CONF"
# restart DHCP server with old configuration
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echo "[INFO] `date -R` Restarting DHCP server"
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if restart_dhcp;
then
echo "[INFO] `date -R` Restart completed"
else
echo "[ERROR] `date -R` DHCP server is not running"
fi
else
echo "[INFO] `date -R` Restart completed"
fi
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else
echo "[ERROR] `date -R` Invalid new config -> keeping old configuration"
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mv -f "$DHCP_CONF".save "$DHCP_CONF"
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fi
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else
echo "[INFO] `date -R` No change -> keeping old configuration"
fi
elif [[ "$status" =~ ^30[0-9] ]]; then
echo "[INFO] `date -R` DHCP configuration not changed"
elif [ "$status" = "404" ]; then
echo "[ERROR] `date -R` Download failed (code: $status). Wrong path to FreenetIS or device $DEVICE_ID not exists."
elif [ "$status" = "403" ]; then
echo "[ERROR] `date -R` Download failed (code: $status). Device $DEVICE_ID not configured properly."
else
echo "[ERROR] `date -R` Download failed (code: $status)"
fi

rm -f "$TMPFILE"
sleep $TIMEOUT
done