73 lines
1.9 KiB
Bash
Executable file
73 lines
1.9 KiB
Bash
Executable file
#!/bin/ash
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#
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#
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#==========================================================================
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#==========================================================================
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#
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# this script collects all mdns names and converts them to a file in /etc/hosts style
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# This file can then be fed to a regular dns server
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#
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# This file should be executed frequently via cron
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FILENAME=/tmp/mdns_hosts
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TMP="/tmp"
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# resolve the name chunksize hosts at the same time.
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chunksize=15
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scriptname=$(basename $0)
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# where should the lockfile be kept?
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LOCKDIR="$TMP/$scriptname"
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# use this executable to resolve a host that was announced via mdns
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RESOLVER="/usr/bin/avahi-resolve-host-name"
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# set to -6 if you want to resolve IPv6 address
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# -4 otherwise
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RESOLVER_ARGS="-4"
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# Path to xargs
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XARGS="/usr/bin/xargs"
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cleanup()
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{
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local exitcode
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local i
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exitcode=$1
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rm -f ${host_tmp}
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if [ ! $exitcode -eq 0 ]
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then
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echo "aborted due to error" >&2
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fi
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trap - 1 2 3 6 9 13 14 15
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rm -f "${LOCKDIR}/PID"
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rm -rf "${LOCKDIR}"
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exit ${exitcode:-1}
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}
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trap 'cleanup 1' 1 2 3 6 9 13 14 15
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# obtain lock
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while ! ( $(mkdir ${LOCKDIR} 2>/dev/null) )
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do
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echo there is already an instance of $(basename $0) running as PID: $(cat "${LOCKDIR}/PID" 2>/dev/null)
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sleep 1
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done
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# lock obtained
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echo $$ > "${LOCKDIR}/PID"
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host_tmp=$(mktemp ${TMP}/$scriptname.XXXXXX)
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hostnames=$(avahi-browse -t -p _workstation._tcp|cut -d\; -f4|cut -d\\ -f1|sort -u|awk '{print $1 ".local"}')
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echo $hostnames | $XARGS -n $chunksize $RESOLVER $RESOLVER_ARGS 2>/dev/null |awk '{print $2 " " $1}' >"${host_tmp}"
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mv "${host_tmp}" "${FILENAME}"
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killall -SIGHUP dnsmasq
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cleanup 0
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