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https://github.com/ben-grande/qusal.git
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61 lines
1.5 KiB
Bash
Executable File
61 lines
1.5 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-FileCopyrightText: 2023 - 2024 Benjamin Grande M. S. <ben.grande.b@gmail.com>
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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set -eu
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wg_conf="/etc/wireguard/wireguard.conf"
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nft_conf="/var/run/wireguard/dnat.nft"
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mkdir -p -- "${nft_conf%/*}"
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rm -f -- "${nft_conf}"
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touch -- "${nft_conf}"
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set_nft(){
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echo "${*}" | tee -a -- "${nft_conf}" >/dev/null
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}
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set_nft_dnat(){
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ipv="${1}" # empty(4), 6
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proto="${2}" # tcp, udp
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dns_host="${3}"
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rule_prefix="insert rule ip${ipv} qubes custom-dnat iifgroup 2 ${proto}"
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rule_suffix="dport 53 dnat to ${dns_host}"
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set_nft "${rule_prefix} ${rule_suffix}"
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}
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dns="$(grep -s -e "^\s*DNS\s*=\s*\S\+" -- "${wg_conf}" |
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sed -e "s/.*=//;s/ //g")"
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if test -z "${dns}"; then
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set_nft "insert rule ip qubes custom-dnat drop"
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set_nft "insert rule ip6 qubes custom-dnat drop"
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exit
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fi
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dns_primary="$(echo "${dns}" | cut -d "," -f 1)"
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dns_secondary="$(echo "${dns}" | cut -d "," -f 2)"
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dns_primary_ipv=""
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if echo "${dns_primary}" | grep -qF -e ":"; then
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dns_primary_ipv=6
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fi
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dns_secondary_ipv=""
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if echo "${dns_secondary}" | grep -qF -e ":"; then
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dns_secondary_ipv=6
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fi
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if test -n "${dns}"; then
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set_nft_dnat "${dns_primary_ipv}" udp "${dns_primary}"
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set_nft_dnat "${dns_primary_ipv}" tcp "${dns_primary}"
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if echo "${dns}" | grep -qF -e ","; then
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set_nft_dnat "${dns_secondary_ipv}" udp "${dns_secondary}"
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set_nft_dnat "${dns_secondary_ipv}" tcp "${dns_secondary}"
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fi
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fi
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ln -sf -- /run/resolvconf/resolv.conf /etc/resolv.conf
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