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#! /bin/sh
#
# printf '%s %s\n' hostname IP-address for each known public retiolum address
#
set -eu
_list_hostname_address() {
cd /etc/tinc/retiolum/hosts
grep --with-filename '^Address' * |
sed -n '
s/: */ /
s/ *= */ /
s/ Address \([a-zA-Z0-9.:_]*\) \?.*/ \1/p'
}
_lookup_address() {
sed '
/:/!{/ [0-9.]*$/!{s/ / `dig +short /;s/$/` \&/}}
s/^/echo /
$s/$/\nwait/
' | sh
}
_filter_public() {
sed '
# drop private IPv4 addresses
/ 10\./d
/ 172\.\(1[6-9]\|2[0-9]\|3[01]\)\./d
/ 192\.168\./d
# TODO drop private IPv6 addresses
'
}
_filter_online() {
awk '
{print"nc -zw 2 "$2" 655 2>/dev/null && echo "$1" "$2" &"}
END {print"wait"}
' | sh
}
_list_hostname_address | _lookup_address | _filter_public | _filter_online
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