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

# Version
VERSION="0.1.3"

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

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

# 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

# endless loop
while true;
do
#path
if [ "$FORCED" = 1 ]; then # forced download (#474)
DOWN_PATH="$FULL_PATH/1"
FORCED=0
else
DOWN_PATH="$FULL_PATH"
fi
# download
TMPFILE=`mktemp`
echo "[INFO] `date -R` Downloading ISC DHCP SERVER config from (${PATH_FN})"

status=`curl -s -o "$TMPFILE" -w "%{http_code}" "$DOWN_PATH"`

# 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)"
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"
#restart DHCP server
echo "[INFO] `date -R` Restarting ISC DHCP server"

service isc-dhcp-server restart 2>&1 >/dev/null
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
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