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49 lines
1.2 KiB
Bash
Executable File
49 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-FileCopyrightText: 2023 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="/home/user/wireguard.conf"
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nft_conf="/var/run/wireguard/dnat.nft"
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mkdir -p /var/run/wireguard/
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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="${3}"
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set_nft "insert rule ip${ipv} qubes custom-dnat iifgroup 2 ${proto} dport 53 dnat to ${dns_host}"
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}
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dns="$(grep -s "^\s*DNS\s*=\s*\S\+" "${wg_conf}" | sed "s/.*=//;s/ //g")"
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dns_primary="$(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 ":"; 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 "${dns_secondary}" | grep -qF ":"; then
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dns_secondary_ipv=6
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fi
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if test -n "${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 "${dns}" | grep -qF ","; then
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set_nft_dnat "${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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