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44 lines
1.3 KiB
Bash
44 lines
1.3 KiB
Bash
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#!/usr/bin/env bash
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set -x
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# This is otherwise the same as resolv.conf-generate.bash, but only adds
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# systemd-resolved as a DNS server. And then it also took parts of the
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# restore script.
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# I know there are old versions that used something else, but I don't remember
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# that name and they are ancient.
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if ! hash resolvectl 2>/dev/null; then
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echo "You don't seem to have systemd-resolved (or resolvectl) installed." 1>&2
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exit 1
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fi
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# Require root or exit
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if [ "$(id -u)" != "0" ]; then
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echo "This script requires root." 1>&2
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exit 1
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fi
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# It's pointless to point at the service if it's not running.
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systemctl enable --now systemd-resolved.service
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# In case I am behind the /etc/resolv.conf, it's immutable and read-only,
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# which won't allow it to be rewritten.
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chattr -V -i /etc/resolv.conf
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chmod -v +w /etc/resolv.conf
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# Or it's a symlink to e.g. /run/systemd/resolve/stub-resolv.conf
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rm -v /etc/resolv.conf
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# tee -p = operate in a more appropriate MODE with pipes.
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printf 'nameserver 127.0.0.53\noptions edns0 trust-ad timeout:1 attempts:5\nsearch .\n' | tee -p /etc/resolv.conf
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# Remove all other permissions than everyone reading resolv.conf
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chmod -v a=r /etc/resolv.conf
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# Make resolv.conf immutable again so it's pretty sure nothing else edits it.
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chattr -V +i /etc/resolv.conf
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# Let's just see it's ok
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ls -l /etc/resolv.conf
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cat /etc/resolv.conf
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set +x
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