144 lines
3.2 KiB
Bash
Executable File
144 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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# 2023-05-18 Hyperling
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# Keep afraid.org dynamic DNS synced on ISP connections without static IPs.
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## Setup ##
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DIR="`dirname $0`"
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PROG=`basename $0`
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if [[ $DIR == "."* ]]; then
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DIR="`pwd`"
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fi
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DOMAIN="sync.afraid.org"
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PROTOCOL="http"
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KEYFILE_NAME="private.key"
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KEYFILE="$DIR/$KEYFILE_NAME"
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## Functions ##
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function usage {
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# Accepts 1 parameter: The exit code to use.
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exit_status=$1
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echo "Usage: $PROG [-4] [-6] [-d | -t] [-v] [-h]" 1>&2
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cat <<- EOF
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Program reads the local $KEYFILE_NAME and syncs with the Dynamic DNS provider.
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Current DNS providers are mentioned in the README, but initally only
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afraid.org is being supported since that is the maintainer's primary
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usage. More may be added eventually or you're welcome to contribute.
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Parameters:
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-4 : Update IPV4.
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-6 : Update IPV6.
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* If neither 4 or 6 are provided, 4 is assumed as Yes.
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-d : Perform a dry run, echoing the commands rather than doing the update.
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-t : Test run. Alias for the dry run option above.
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-v : Enable extra output, helpful for debugging.
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-h : Print this list of parameters.
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EOF
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exit $exit_status
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}
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function check {
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# Accepts parameter of status and whether the program is needs to quit.
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status=$1
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quit=$2
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if [[ $status != 0 ]]; then
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echo "ERROR: Did not receive a successful return message, got $status." 1>&2
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if [[ $quit == "Y" ]]; then
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exit $status
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fi
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fi
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echo "Status $status is acceptable."
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}
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## Validations ##
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# Ensure the account key is present and has contents.
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if [[ ! -s $KEYFILE ]]; then
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echo "ERROR: Key file '$KEYFILE' is empty or does not exist." 1>&2
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echo -e "Please see '$DIR/README.md' for instructions.\n"
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usage
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fi
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## Parameters ##
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while getopts ":46dtvh" opt; do
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case $opt in
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4) v4="Y"
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;;
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6) v6="Y"
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;;
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d | t) dry_run="Y"
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;;
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v) set -x
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;;
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h) usage 0
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;;
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*) echo "ERROR: Parameter $opt not recognized."
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usage 1
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;;
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esac
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done
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# Cannot set both 4 and 6, otherwise only the 2nd takes effect.
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if [[ -n $v4 && -n $v6 ]]; then
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echo "ERROR: Cannot set both v4 and v6, please only choose one." 1>&2
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usage 1
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fi
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# If neither parameter was passed, assume 4 is wanted.
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if [[ -z $v4 && -z $v6 ]]; then
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v4="Y"
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fi
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## Main ##
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# Use echo instead of cURL if doing a dry/test run.
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command="curl -w HTTP%{http_code}\n"
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if [[ $dry_run == "Y" ]]; then
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command="echo $command"
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fi
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# Ensure permissions are strict.
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chmod -c 600 $KEYFILE
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# Get the user's key
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if [[ -n $KEYFILE ]]; then
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key=`cat $KEYFILE`
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else
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echo "ERROR: Cannot find '$KEYFILE'. Please set up your account key." 1>&2
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usage 1
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fi
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# Remove any padding like newlines or trailing spaces
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key=`echo $key`
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# Ensure we got a value
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if [[ -z $key ]]; then
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echo "ERROR: Key contents were not read, is '$KEYFILE' set up proerly?." 1>&2
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usage 1
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fi
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# Try to ensure the key is not going to cause a malformed link somehow.
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if [[ $key == *" "* ]]; then
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echo "WARNING: Space character found in key. Is that correct? Converting to %20." 1>&2
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key=${key// /%20}
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fi
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uri="$DOMAIN/u/$key/"
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# Connect with the provider.
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if [[ $v4 == "Y" ]]; then
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$command $PROTOCOL://$uri
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check $? Y
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fi
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if [[ $v6 == "Y" ]]; then
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$command $PROTOCOL://v6.$uri
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check $? Y
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fi
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exit 0
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