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35 lines
1.3 KiB
35 lines
1.3 KiB
5 years ago
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#!/usr/bin/env bash
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auto-mtu() {
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local mtu=0 endpoint output
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while read -r _ endpoint; do
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[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
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output="$(ip route get "${BASH_REMATCH[1]}" || true)"
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
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done < <(wg show "$1" endpoints)
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if [[ $mtu -eq 0 ]]; then
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read -r output < <(ip route show default || true) || true
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
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fi
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[[ $mtu -gt 0 ]] || mtu=1500
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ip link set mtu $(( mtu - 80 )) up dev "$1"
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}
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# probe for any modules that may be needed
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modprobe wireguard
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modprobe tun
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# try wireguard kernel module first
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ip link add "$1" type wireguard && exit
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# try boringtun and let it drop privileges
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boringtun "$1" && auto-mtu "$1" && exit
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# try boringtun w/o dropping privileges
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WG_SUDO=1 boringtun "$1" && auto-mtu "$1" && exit
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# try wireguard-go - p.s. should not use wireguard-go, it leaks memory
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WG_I_PREFER_BUGGY_USERSPACE_TO_POLISHED_KMOD=1 wireguard-go "$1" && auto-mtu "$1" && exit
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exit 1
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