/etc/ppp/ip-up.d/000resolvconf is in openresolv 3.8.0-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
# ppp.ip-up hook script for resolvconf
# Written by Roy Marples <roy@marples.name> under the BSD-2 license
[ -x /sbin/resolvconf ] || exit 0
if [ -n "$DNS1" -o -n "$DNS2" ]; then
conf="# Generated by ppp.ip-up for $PPP_IFACE\n"
[ -n "$DNS1" ] && conf="${conf}nameserver $DNS1\n"
[ -n "$DNS2" ] && conf="${conf}nameserver $DNS2\n"
printf "$conf" | /sbin/resolvconf -a "$PPP_IFACE"
fi
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