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131 lines
4.3 KiB
Bash
Executable File
131 lines
4.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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usage() {
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printf "Usage: %s: <routerAliasIp:gateway:netmask:start_ip_of_subnet:-routerAlisIp:gateway:....>\n" $(basename $0) >&2
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}
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source /root/func.sh
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lock="biglock"
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locked=$(getLockFile $lock)
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if [ "$locked" != "1" ]
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then
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exit 1
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fi
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#set -x
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#backup the old config file
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DHCP_CONFIG=/etc/dnsmasq.d/multiple_ranges.conf
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DHCP_CONFIG_BAK=/etc/dnsmasq.d/multiple_ranges.conf.bak
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DHCP_CONFIG_MAIN=/etc/dnsmasq.conf
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DHCP_CONFIG_MAIN_BAK=/etc/dnsmasq.conf.bak
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DHCP_FAILURE_CONFIG=/etc/multiple_ranges.conf.failure
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DHCP_FAILURE_CONFIG_MAIN=/etc/dnsmasq.conf.failure
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CMDLINE=$(cat /var/cache/cloud/cmdline | tr '\n' ' ')
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#take a backup copy of the dnsmasq file.
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cp "$DHCP_CONFIG_MAIN" "$DHCP_CONFIG_MAIN_BAK"
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cp "$DHCP_CONFIG" "$DHCP_CONFIG_BAK"
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#empty the config file
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echo > $DHCP_CONFIG
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var="$1"
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dhcp_range=""
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dhcp_gateway=""
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dhcp_netmask=""
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dns_option=""
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dns_servers=""
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count=0
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# fetching the dns Ips from the command line.
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dns1=$(echo "$CMDLINE" | grep -o " dns1=[[:digit:]].* " | sed -e 's/dns1=//' | awk '{print $1}')
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dns2=$(echo "$CMDLINE" | grep -o " dns2=[[:digit:]].* " | sed -e 's/dns2=//' | awk '{print $1}')
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dns_servers="${dns1}"
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if [ -n "$dns2" ]
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then
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dns_servers="${dns1},${dns2}"
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fi
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# check if useextdns is true
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use_ext_dns=$(echo "$CMDLINE" | grep -o "useextdns=true")
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while [ -n "$var" ]
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do
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var1=$(echo $var | cut -f1 -d "-")
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routerip=$( echo $var1 | cut -f1 -d ":" )
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gateway=$(echo $var1 | cut -f2 -d ":")
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netmask=$(echo $var1 | cut -f3 -d ":")
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start_ip_of_subnet=$(echo $var1 | cut -f4 -d ":")
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dhcp_range="${dhcp_range}"'dhcp-range=set:range'$count","$start_ip_of_subnet",static \n"
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dhcp_gateway="${dhcp_gateway}"'dhcp-option=tag:range'$count",3,"$gateway" \n"
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dhcp_netmask="${dhcp_netmask}"'dhcp-option=tag:range'$count",1,"$netmask" \n"
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if [ -n "$use_ext_dns" ]
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then
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dns_option="${dns_option}"'dhcp-option=tag:range'$count",6,"$dns_servers" \n"
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else
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dns_option="${dns_option}"'dhcp-option=tag:range'$count",6,$routerip"","$dns_servers" \n"
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fi
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var=$( echo $var | sed "s/${var1}-//" )
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count=$[$count+1]
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done
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#logging the configuration being removed.
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log=""
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log="${log}"`grep "^dhcp-option=6" "$DHCP_CONFIG_MAIN"`"\n"
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log="${log}"`grep "^dhcp-option=option:router" "$DHCP_CONFIG_MAIN"`"\n"
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log="${log}"`grep "^dhcp-range=" "$DHCP_CONFIG_MAIN"`"\n"
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if [ "$log" != '\n\n\n' ]
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then
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#Cleaning the existing dhcp confgiuration
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logger -t cloud "dnsmasq.sh: remvoing the primaryip confg from dnsmasq.conf and adding it to /etc/dnsmaq.d/multiple_ranges.conf"
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logger -t cloud "dnsmasq.sh: config removed from dnsmasq.conf is $log"
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sed -i -e '/dhcp-option=6/d' "$DHCP_CONFIG_MAIN"
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sed -i -e '/dhcp-option=option:router/d' "$DHCP_CONFIG_MAIN"
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sed -i -e '/^dhcp-range=/d' "$DHCP_CONFIG_MAIN"
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fi
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#wrting the new config into the config file.
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echo -e "$dhcp_range" >> "$DHCP_CONFIG"
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echo -e "$dhcp_gateway" >> "$DHCP_CONFIG"
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echo -e "$dhcp_netmask" >> "$DHCP_CONFIG"
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echo -e "$dns_option" >> "$DHCP_CONFIG"
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#restart the dnsmasq
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service dnsmasq restart
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result=$?
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if [ "$result" -ne "0" ]
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then
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logger -t cloud "dnsmasq.sh: could not configure dnsmasq"
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logger -t cloud "dnsmasq.sh: reverting to the old config"
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logger -t cloud "dnsmasq.sh: copying the failure config to `$DHCP_FAILURE_CONFIG` and `$DHCP_FAILURE_CONFIG_MAIN`"
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cp "$DHCP_CONFIG" "$DHCP_FAILURE_CONFIG"
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cp "$DHCP_CONFIG_MAIN" "$DHCP_FAILURE_CONFIG_MAIN"
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cp "$DHCP_CONFIG_BAK" "$DHCP_CONFIG"
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cp "$DHCP_CONFIG_MAIN_BAK" "$DHCP_CONFIG_MAIN"
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service dnsmasq restart
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unlock_exit $result $lock $locked
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fi
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rm "$DHCP_CONFIG_BAK"
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rm "$DHCP_CONFIG_MAIN_BAK"
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unlock_exit $result $lock $locked
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