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#!/bin/sh
BRNUM=0
CNET="10.$BRNUM.0"
IFACE_LIST=/tmp/interfaces
get_interfaces() {
[ -f "$IFACE_LIST" ] || tail -n +3 /proc/net/dev \
| awk -F: '$1 !~ /lo/ { print $1 }' > "$IFACE_LIST"
cat "$IFACE_LIST"
}
make_dhcp_subnet() {
local num=$1
local iface=$2
local network="$CNET.$num"
local netmask=255.255.255.240
local router="$CNET.$(( $num + 1 ))"
local poolstart="$CNET.$(( $num + 2 ))"
local poolend="$CNET.$(( $num + 14 ))"
echo "subnet $network netmask $netmask {"
echo " range $poolstart $poolend;"
echo " option routers $router;"
echo "}"
echo ""
ip addr add $router/28 dev $iface || echo "Failed to set address $router/28 on $iface" >&2
ip link set dev $iface up
iptables -t nat -A PREROUTING -i $iface -j DNAT --to-destination $router
}
make_dhcp_global() {
echo "option domain-name \"bootstrap.invalid\";"
echo "option domain-name-servers $CNET.1;"
echo "ddns-update-style none;"
echo ""
}
# parse args
while getopts "b:" opts; do
case "$opts" in
b) BRNUM="$OPTARG";;
h) usage;;
esac
done
shift $(( $OPTIND - 1 ))
hostname alpine
# install needed packages
apk_add dhcp iptables tinydns acf-apk "$@"
# config dhcp server
make_dhcp_global > /etc/dhcp/dhcpd.conf
count=0
for i in $(get_interfaces); do
# maximum 16 network interfaces
[ $count -ge 16 ] && break
make_dhcp_subnet $(( $count * 16 )) $i >> /etc/dhcp/dhcpd.conf
count=$(( $count + 1 ))
done
/etc/init.d/syslog start
/etc/init.d/dhcpd start
FORCE_SETUP_WEBCONF=yes setup-webconf apk "$@"
# set up http listener/forwarder
mkdir -p /var/www/redirect
cat <<EOF >/var/www/redirect/index.html
<html>
<head>
<meta HTTP-EQUIV="REFRESH" content="0; url=https://$(hostname)">
</head>
<body>
</body>
</html>
EOF
httpd -h /var/www/redirect
# dummy dns
echo "* $CNET.1" > /etc/dnsd.conf
/etc/init.d/dnsd start
exit 0
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