50 lines
1.2 KiB
Bash
50 lines
1.2 KiB
Bash
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#!/bin/sh
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# env
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# Written in 2019 by Lucas
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# CC0 1.0 Universal/Public domain - No rights reserved
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty. You should have received a copy of the CC0 Public Domain
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# Dedication along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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usage() {
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cat - <<. >&2
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Usage:
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${0##*/} attach TRUNK_DEV URNDIS_DEV
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${0##*/} detach TRUNK_DEV URNDIS_DEV
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.
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exit 1
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}
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renew_dhcp_if_needed() {
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iface=$1
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hostname_if=/etc/hostname."$iface"
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[ ! -r "$hostname_if" ] && return
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while read -r line; do
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[ "$line" = dhcp ] && dhclient "$iface" && break
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done <"$hostname_if"
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}
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if [ $# -ne 3 ] || [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then
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usage
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fi
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cmd=$1
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trunk=$2
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urndis=$3
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case $cmd in
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attach) ifconfig "$urndis" up
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ifconfig "$trunk" trunkport "$urndis"
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renew_dhcp_if_needed "$trunk"
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;;
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detach) # $urndis could be already removed
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ifconfig "$trunk" -trunkport "$urndis" 2>/dev/null || true
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renew_dhcp_if_needed "$trunk"
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;;
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*) usage
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;;
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esac
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