evenet/tinc-up

152 lines
3.5 KiB
Bash
Executable File

#!/usr/bin/env bash
set -eu
has() {
command -v "$1" >/dev/null 2>&1
}
die() {
echo $1 &>2
exit 1
}
set_mac() {
local interface=$1
local mac_address=$2
if has ifconfig; then
current_mac=$(ifconfig "$interface" | awk '/ether/ {print $2}')
if [[ "${current_mac,,}" == "${mac_address,,}" ]]; then
return
fi
ifconfig "$interface" down
if [[ "$OSTYPE" == "linux-gnu" ]]; then
ifconfig "$interface" hw ether "$mac_address"
else
ifconfig "$interface" ether "$mac_address"
fi
ifconfig "$interface" up
elif has ip; then
ip link set dev "$interface" down
ip link set dev "$interface" address "$mac_address"
ip link set dev "$interface" up
else
die "no suitable program found to configure the network interface, need iproute2 or ifconfig"
fi
}
mask2cidr() {
local netmask=$1
local nbits=0
IFS=.
for dec in "$netmask"; do
case $dec in
255) let nbits+=8;;
254) let nbits+=7;;
252) let nbits+=6;;
248) let nbits+=5;;
240) let nbits+=4;;
224) let nbits+=3;;
192) let nbits+=2;;
128) let nbits+=1;;
0);;
*) die "Error: $dec is not recognised"
esac
done
echo "$nbits"
}
set_ip() {
local interface=$1
local ip=$2
local netmask=$3
if has ifconfig; then
ifconfig "$interface" "$ip" netmask "$netmask"
elif has ip; then
ip addr add "$ip" dev "$interface"
else
die "no suitable program found to set ip address, need iproute2 or ifconfig"
fi
}
start_dhclient() {
local interface=$1
if [[ "$OSTYPE" == "linux-gnu" ]]; then
dhclient -x
dhclient -nw "$interface"
elif [[ "$OSTYPE" == "freebsd"* ]]; then
# prefer isc-dhcp-client as it supports dhcpv6
if [[ -x /usr/local/sbin/dhclient ]]; then
/usr/local/sbin/dhclient -x
/usr/local/sbin/dhclient -nw "$interface"
else
dhclient -b "$interface"
fi
else
nohup setsid dhclient "$interface" >/dev/null 2>&1
fi
}
start_dhcp() {
local interface=$1
if has dhcpcd; then
dhcpcd -b -n "$interface"
elif has dhclient; then
start_dhclient "$interface"
elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO untested
ipconfig set "$interface" DHCP
else
die "no suitable dhcp program found, need dhcpcd or dhclient"
fi
}
disable_ipv6_privacy() {
local interface=$1
if [[ "$OSTYPE" == "linux-gnu" ]]; then
sysctl -w "net.ipv6.conf.${interface}.use_tempaddr=0"
elif [[ "$OSTYPE" == "openbsd"* ]]; then
ifconfig "${interface}" -autoconfprivacy
elif has sysctl; then
sysctl -w net.inet6.ip6.use_tempaddr=0
fi
}
[ -z "${INTERFACE:-}" ] && die "no INTERFACE environment variable set"
DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
MAC_ADDRESS_FILE="${DIR}/tinc-macaddr"
LOCAL_HOOK_FILE="${DIR}/tinc-up.local"
TINCRC="${DIR}/tincrc"
MAC_ADDRESS=""
SUBNET=""
DHCP="yes"
IPV6_PRIVACY="yes"
source "${TINCRC}" || true
if [ -z "$MAC_ADDRESS" ]; then
echo "${MAC_ADDRESS_FILE} does not exists. Generate it with ./tinc-generate-mac..."
"$DIR/tinc-generate-mac"
source "$TINCRC"
fi
set_mac "$INTERFACE" "$MAC_ADDRESS"
if [ -n "$SUBNET" ]; then
IFS=' ' read ip netmask <<< "$SUBNET"
[ -z "$ip" ] && die "no ip set in SUBNET"
[ -z "$netmask" ] && die "no netmask set in SUBNET"
set_ip "$INTERFACE" "$ip" "$netmask"
fi
if [ "${DHCP,,}" = "yes" ]; then
start_dhcp "$INTERFACE"
fi
if [[ "${IPV6_PRIVACY,,}" != "yes" ]]; then
disable_ipv6_privacy "$INTERFACE"
fi
[ -x "${DIR}/tinc-up.local" ] && "${DIR}/tinc-up.local" || true