353 lines
13 KiB
Bash
Executable File
353 lines
13 KiB
Bash
Executable File
#!/bin/bash
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### Define functions
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function scriptHelp {
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echo -e "\e[1;39mUsage:"
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echo -e "\e[1;36m$(basename ${0})" \
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"\e[1;35m-f /path/to/account/details.file"
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echo -e "\t\e[1;33m-r record.to.update [-r another.record.to.update -r ...]"
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echo -e "\t\e[0;92m[optional parameters]\e[0m\n"
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echo -e "\e[1;39mNotes:\e[0m"
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echo -e "-f and -r parameters are REQUIRED."
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echo -e "Multiple A/AAAA records to update can be specified by supplying"
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echo -e "\tmultiple -r parameters (see examples below)."
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echo "This script can operate only in either IP4 OR IP6 mode. See below."
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echo "This script will NOT verify the format or validity of supplied IP"
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echo -e "\taddresses."
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echo -e "\n\e[1;39mOptional parameters\e[0m"
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echo -e "-i\tUse this IP address when updating DNS records"
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echo -e "\tIf NOT supplied, the script will attempt to auto-detect this"
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echo -e "\tmachine's IP address (depending on -4 or -6 parameters) and"
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echo -e "\tuse that address for DNS updates. The script does NOT check"
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echo -e "\tthe validity of an address supplied using this parameter nor"
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echo -e "\tthe protocol type (IP4 vs IP6)."
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echo -e "-4\tOperate in IP4 mode and update A records (default)"
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echo -e "\tThis is the default operating mode and does not need to be"
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echo -e "\texplicitly specified. Ensure you have supplied a valid IP4"
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echo -e "\taddress using the -i parameter or that your machine's IP4"
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echo -e "\taddress can be correctly detected externally."
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echo -e "-6\tOperate in IP6 mode and update AAAA records"
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echo -e "\tONLY AAAA records will be updated. Ensure you have supplied"
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echo -e "\ta valid IP6 address using the -i parameter or that your"
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echo -e "\tmachine's IP6 address can be correctly detected externally."
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echo -e "-h\tDisplay this help page"
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echo -e "-x\tDisplay script examples"
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echo -e "-l\tLocation for log file output"
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echo -e "\tDefault: scriptname.ext.log in same directory as this script"
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echo -e "\n\e[1;39mExamples:"
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echo -e "\e[0;39mRun \e[1;36m$(basename ${0}) \e[1;92m-x\e[0m\n"
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echo -e "\n"
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# exit with any error code used to call this help screen
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quit none $1
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}
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function scriptExamples {
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echo -e "\n\e[1;39m$(basename ${0}) Examples:\e[0m"
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echo -e "\n\e[1;39mExample: \e[0mUse details from myCloudFlareDetails.info"
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echo -e "file in /home/janedoe directory. Update server.mydomain.com A record"
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echo -e "with this machine's auto-detected IP4 address."
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echo -e "\t\e[1;36m$(basename ${0})" \
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"\e[1;35m-f /home/janedoe/myCloudFlareDetails.info"
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echo -e "\t\e[1;33m-r server.mydomain.com\e[0m"
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echo -e "\n\e[1;39mExample: \e[0mUse details from myCloudFlareDetails.info"
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echo -e "file in /home/janedoe directory. Update server.mydomain.com AND"
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echo -e "server2.mydomain.com A records with this machine's auto-detected IP6"
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echo -e "address."
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echo -e "\t\e[1;36m$(basename ${0})" \
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"\e[1;35m-f /home/janedoe/myCloudFlareDetails.info"
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echo -e "\t\e[1;33m-r server.mydomain.com" \
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"-r server2.mydomain.com \e[1;92m-6\e[0m"
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echo -e "\n\e[1;39mExample: \e[0mUse details from myCloudFlareDetails.info"
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echo -e "file in /home/janedoe directory. Update server.mydomain.com A record"
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echo -e "using IP4 address 1.2.3.4."
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echo -e "\t\e[1;36m$(basename ${0})" \
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"\e[1;35m-f /home/janedoe/myCloudFlareDetails.info"
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echo -e "\t\e[1;33m-r server.mydomain.com \e[1;92m-i 1.2.3.4\e[0m"
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echo -e "\n\e[1;39mExample: \e[0mUse details from myCloudFlareDetails.info"
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echo -e "file in /home/janedoe directory. Update server3.mydomain.com AND"
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echo -e "server7.mydomain.com AAAA records using IP6 address FE80::286A:FF91."
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echo -e "\t\e[1;36m$(basename ${0})" \
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"\e[1;35m-f /home/janedoe/myCloudFlareDetails.info"
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echo -e "\t\e[1;33m-r server.mydomain.com" \
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"\e[1;33m-r server2.mydomain.com \e[1;92m-i FE80::286A:FF91\e[0m"
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quit none
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}
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function quit {
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if [ -z "$1" ]; then
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# exit cleanly
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echo -e "\e[1;32m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"--[SUCCESS] Script completed --\e[0m" >> "$logFile"
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exit 0
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elif [ "$1" = "none" ]; then
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if [ -z "$2" ]; then
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# exit cleanly
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exit 0
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else
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# exit with error code but don't log/display it
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exit "$2"
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fi
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elif [ "$1" = "199" ]; then
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# list DNS entries that were not updated
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for failedName in "${failedDNS[@]}"; do
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echo -e "\e[1;31m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"-- [ERROR] $failedName was NOT updated --\e[0m" >> "$logFile"
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done
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exit "$1"
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else
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# notify use that error has occurred and provide exit code
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echo -e "\e[1;31m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"-- [ERROR] Script exited with code $1 --" >> "$logFile"
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echo -e "\e[0;31m${errorExplain[$1]}\e[0m" >> "$logFile"
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exit "$1"
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fi
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}
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### end of functions
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### unset environment variables used in this script and initialize arrays
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unset PARAMS
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unset accountFile
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unset ipAddress
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errorExplain=()
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dnsRecords=()
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cfDetails=()
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cfRecords=()
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currentIP=()
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recordID=()
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failedDNS=()
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ip4=1
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ip6=0
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## define error code explainations
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errorExplain[1]="Missing or invalid parameters on script invocation."
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errorExplain[2]="curl is required to access CloudFlare API. Please install curl. (apt-get install curl on debian/ubuntu)."
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errorExplain[101]="Location of file with CloudFlare account details was NOT provided (-f parameter missing)."
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errorExplain[102]="CloudFlare account details file is empty or does not exist"
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errorExplain[103]="No DNS records to update were specified (-r parameter(s) missing)."
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errorExplain[104]="There are no DNS records specified that match those found in your CloudFlare account to update."
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errorExplain[201]="Could not detect this machine's IP address. Please re-run this script with the -i option."
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errorExplain[254]="Could not connect with CloudFlare API. Please re-run this script later."
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## Logging parameters -- default set to scriptname.ext.log in same
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## directory as this script
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scriptPath="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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scriptName="$(basename ${0})"
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logFile="$scriptPath/${scriptName%.*}.log"
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### Process script parameters
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if [ -z $1 ]; then
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scriptHelp 1
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fi
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while getopts ':f:r:i:46hxl:' PARAMS; do
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case "$PARAMS" in
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f)
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# path to file with CloudFlare account details
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accountFile="${OPTARG}"
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;;
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r)
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# DNS records to update
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dnsRecords+=($OPTARG)
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;;
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i)
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# IP address to use -- NOT parsed for correctness
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ipAddress="$OPTARG"
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;;
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4)
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# Put script in IP4 mode (default)
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ip4=1
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ip6=0
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;;
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6)
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# Put script in IP6 mode
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ip4=0
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ip6=1
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;;
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h)
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# Display info on script usage
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scriptHelp
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;;
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x)
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# Show examples of script usage
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scriptExamples
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;;
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l)
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# Path to write log file
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logFile="${OPTARG}"
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;;
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?)
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scriptHelp 1
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;;
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esac
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done
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# Log beginning of script
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echo -e "\e[1;32m[`date +%Y-%m-%d` `date +%H:%M:%S`] -- Start CloudFlare" \
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"DDNS script execution --\e[0m" >> "$logFile"
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# Check validity of parameters
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if [ -z "$accountFile" ] || [[ $accountFile == -* ]]; then
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quit 101
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elif [ ! -s "$accountFile" ]; then
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quit 102
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elif [ -z ${dnsRecords} ]; then
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quit 103
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fi
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# Check if curl is installed
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command -v curl >> /dev/null
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curlResult=$(echo "$?")
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if [ $curlResult -ne 0 ]; then
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quit 2
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fi
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# Log operating mode
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if [ $ip4 -eq 1 ]; then
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echo -e "\e[1;36m[`date +%Y-%m-%d` `date +%H:%M:%S`] Script running in" \
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"IP4 mode\e[0m" >> "$logFile"
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elif [ $ip6 -eq 1 ]; then
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echo -e "\e[1;36m [`date +%Y-%m-%d` `date +%H:%M:%S`] Script running in" \
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"IP6 mode\e[0m" >> "$logFile"
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fi
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## Extract needed information from accountDetails file
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mapfile -t cfDetails < "$accountFile"
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## Get current IP address, if not provided in parameters
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if [ -z "$ipAddress" ]; then
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echo -e "\e[1;36m[`date +%Y-%m-%d` `date +%H:%M:%S`] No IP address for" \
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"update provided. Detecting this machine's IP address..." \
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>> "$logFile"
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if [ $ip4 -eq 1 ]; then
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ipAddress=$(curl -s http://ipv4.icanhazip.com)
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elif [ $ip6 -eq 1 ]; then
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ipAddress=$(curl -s http://ipv6.icanhazip.com)
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fi
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# check if curl reported any errors
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ipLookupResult=$(echo "$?")
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if [ "$ipLookupResult" -ne 0 ]; then
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quit 201
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fi
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fi
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echo -e "\e[1;36m[`date +%Y-%m-%d` `date +%H:%M:%S`] Using IP address:" \
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"$ipAddress" >> "$logFile"
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## Check if desired record(s) exist at CloudFlare
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echo -e "\e[0m[`date +%Y-%m-%d` `date +%H:%M:%S`] Performing CloudFlare" \
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"lookup on specified DNS records...\e[0m" >> "$logFile"
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# perform checks on A or AAAA records based on invocation options
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if [ $ip4 -eq 1 ]; then
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echo -e "[`date +%Y-%m-%d` `date +%H:%M:%S`] (IP4: ${dnsRecords[*]})" \
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>> "$logFile"
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for cfLookup in "${dnsRecords[@]}"; do
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cfRecords+=("$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${cfDetails[2]}/dns_records?name=$cfLookup&type=A" -H "X-Auth-Email: ${cfDetails[0]}" -H "X-Auth-Key: ${cfDetails[1]}" -H "Content-Type: application/json")")
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done
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elif [ $ip6 -eq 1 ]; then
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echo -e "[`date +%Y-%m-%d` `date +%H:%M:%S`] (IP6: ${dnsRecords[*]})" \
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>> "$logFile"
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for cfLookup in "${dnsRecords[@]}"; do
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cfRecords+=("$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/${cfDetails[2]}/dns_records?name=$cfLookup&type=AAAA" -H "X-Auth-Email: ${cfDetails[0]}" -H "X-Auth-Key: ${cfDetails[1]}" -H "Content-Type: application/json")")
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done
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fi
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# check for curl errors
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cfLookupResult=$(echo "$?")
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if [ "$cfLookupResult" -ne 0 ]; then
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quit 254
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fi
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# check for any non-existant domain names and remove from array
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for recordIdx in "${!cfRecords[@]}"; do
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if [[ ${cfRecords[recordIdx]} == *"\"count\":0"* ]]; then
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# inform user that domain not found in CloudFlare DNS records
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echo -e "\e[0;31m[`date +%Y-%m-%d` `date +%H:%M:%S`] ***" \
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"${dnsRecords[recordIdx]} not found in your" \
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"CloudFlare DNS records***\e[0m" >> "$logFile"
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# remove the entry from the dnsRecords array
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unset dnsRecords[$recordIdx]
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# remove the entry from the records array
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unset cfRecords[$recordIdx]
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fi
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done
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# contract the dnsRecords and cfRecords arrays to re-order them after any
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# deleted records
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dnsRecords=("${dnsRecords[@]}")
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cfRecords=("${cfRecords[@]}")
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# after trimming errant records, it's possible dnsRecords array is empty
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# check for this condition and exit (nothing to do), otherwise list arrays
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if [ -z ${dnsRecords} ]; then
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quit 104
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else
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for recordIdx in "${!cfRecords[@]}"; do
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echo -e "\e[1;39m[`date +%Y-%m-%d` `date +%H:%M:%S`] Found" \
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"${dnsRecords[recordIdx]} (Index: $recordIdx):\e[0m" \
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>> "$logFile"
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done
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fi
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## Get existing IP address and identifier in CloudFlare's DNS records
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for recordIdx in "${!cfRecords[@]}"; do
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currentIP+=($(echo "${cfRecords[recordIdx]}" | \
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grep -Po '(?<="content":")[^"]*'))
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recordID+=($(echo "${cfRecords[recordIdx]}" | \
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grep -Po '(?<="id":")[^"]*'))
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echo -e "\e[0m[`date +%Y-%m-%d` `date +%H:%M:%S`] Index $recordIdx:" \
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"For record ${dnsRecords[recordIdx]}" \
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"with ID: ${recordID[recordIdx]}" \
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"the current IP is \e[1;35m ${currentIP[recordIdx]}" \
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"\e[0m" >> "$logFile"
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done
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## Check whether new IP matches old IP and update if they do not match
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for recordIdx in "${!currentIP[@]}"; do
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if [ ${currentIP[recordIdx]} = $ipAddress ]; then
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echo -e "\e[1;32m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"${dnsRecords[recordIdx]} is up-to-date.\e[0m" \
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>> "$logFile"
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else
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echo -e "\e[0;31m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"${dnsRecords[recordIdx]} needs updating...\e[0m" \
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>> "$logFile"
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if [ $ip4 -eq 1 ]; then
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# update record at CloudFlare with new IP
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update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/${cfDetails[2]}/dns_records/${recordID[recordIdx]}" -H "X-Auth-Email: ${cfDetails[0]}" -H "X-Auth-Key: ${cfDetails[1]}" -H "Content-Type: application/json" --data "{\"id\":\"${cfDetails[2]}\",\"type\":\"A\",\"proxied\":false,\"name\":\"${dnsRecords[recordIdx]}\",\"content\":\"$ipAddress\"}")
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elif [ $ip6 -eq 1 ]; then
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# update record at CloudFlare with new IP
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update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/${cfDetails[2]}/dns_records/${recordID[recordIdx]}" -H "X-Auth-Email: ${cfDetails[0]}" -H "X-Auth-Key: ${cfDetails[1]}" -H "Content-Type: application/json" --data "{\"id\":\"${cfDetails[2]}\",\"type\":\"AAAA\",\"proxied\":false,\"name\":\"${dnsRecords[recordIdx]}\",\"content\":\"$ipAddress\"}")
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fi
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# check for success code from CloudFlare
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if [[ $update == *"\"success\":true"* ]]; then
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echo -e "\e[1;32m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"${dnsRecords[recordIdx]} updated.\e[0m" >> "$logFile"
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else
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echo -e "\e[1;31m[`date +%Y-%m-%d` `date +%H:%M:%S`]" \
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"${dnsRecords[recordIdx]} update failed\e[0m" >> "$logFile"
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echo -e "\e[0;39m$update\e[0m" >> "$logFile"
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failedDNS+=("${dnsRecords[recordIdx]}")
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fi
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fi
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done
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# Check if failedDNS array contains entries and exit with error, else exit 0
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if [ -z "${failedDNS}" ]; then
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quit
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else
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quit 199
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fi
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# this code should never be executed
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exit 99
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