#!/bin/sh PROGRAM=setup-interfaces PREFIX= . $PREFIX/lib/libalpine.sh detect_interfaces() { ip addr | grep -v ' lo:' | awk -F : '/^[0-9]*:/ { print $2}' } get_first_unconfigured() { ls *.noconf 2>/dev/null | head -n 1 | sed 's/.noconf//' } get_default_addr() { # check if dhcpcd is running if pidof dhcpcd > /dev/null && [ -f "$ROOT/var/lib/dhcpc/dhcpcd-$1.info" ]; then echo dhcp else ip addr show $1 | awk '/inet / {print $2}' | head -n 1 | sed 's:/.*::' fi } get_default_mask() { if [ "$1" ] ; then ipcalc -m $1 | sed 's/.*=//' else echo "255.255.255.0" fi } get_default_gateway() { ip route show dev $1 | awk '/^default/ {print $3}' } config_iface() { local iface=$1 local prefix=$2 local address local netmask local gateway local conf=$prefix$iface.conf # use ipcalc to validate the address. we do accept /mask # we are no interested in the result, only error code, so # we send result to /dev/null while ! ipcalc -s -m $address >/dev/null 2>&1; do address=`get_default_addr $iface` [ -z "$address" ] && address="dhcp" echon "Ip address for $iface? (or 'dhcp') [$address] " default_read address $address [ "$address" = "abort" ] && return if [ "$address" = "dhcp" ] ; then HAS_DHCP=yes echo "type=dhcp" > $conf rm $iface.noconf return fi done # extract netmask if entered together with address if [ "$address" != "${address%%/*}" ]; then netmask=$(ipcalc -s -m $address | cut -d= -f2) fi # use ipcalc -m to validate netmask. we dont accept /mask suffix # so we pass on a dummy mask to ipcalc. while ! ipcalc -s -m $netmask/0 >/dev/null 2>&1; do netmask=`get_default_mask $address` echon "Netmask? [$netmask] " default_read netmask "$netmask" [ "$netmask" = "abort" ] && return done # use ipcalc -m to validate netmask. we dont accept /mask suffix # so we pass on a dummy mask to ipcalc. while ! ipcalc -s -m $gateway/0 >/dev/null 2>&1; do gateway=`get_default_gateway $iface` [ -z "$gateway" ] && gateway=none echon "Gateway? (or 'none') [$gateway] " default_read gateway $gateway [ "$gateway" = "abort" ] && return [ "$gateway" = "none" ] && gateway="" [ -z "$gateway" ] && break done echo "type=static" > $conf echo "address=${address%%/*}" >> $conf #strip off /mask if there echo "netmask=$netmask" >> $conf echo "gateway=$gateway" >> $conf # print summary echo "Configuration for $iface:" sed 's/^/ /' $conf rm $iface.noconf } usage() { cat <<__EOF__ usage: setup-interfaces [-h] [-i read custom /etc/network/interfaces from stdin] Setup network interfaces options: -h Show this help -i Read new contents of /etc/network/interfaces from stdin __EOF__ exit 1 } prompt_for_interfaces() { init_tmpdir TMP cd $TMP for i in $(detect_interfaces); do touch $i.noconf done index=1 while ls *.noconf > /dev/null 2>&1 ; do echon "Available interfaces are:" for i in *.noconf; do echon " `basename $i .noconf`" done echo "." firstif=`get_first_unconfigured` echon "Which one do you want to initialize? (or 'done') [$firstif] " default_read iface "$firstif" [ "$iface" = "done" ] && break [ -f $iface.noconf ] || continue config_iface $iface $(printf "%.3d~" $index) index=$(( $index + 1 )) done echo "type=loopback" > 000~lo.conf echo "" > interface hostname=$(cat /etc/hostname 2>/dev/null) for i in *.conf ; do iface=`basename $i .conf` iface=${iface#[0-9]*~} . ./$i echo "auto $iface" >> interfaces echo "iface $iface inet $type" >> interfaces case $type in dhcp) [ -n "$hostname" ] \ && echo -e "\thostname $hostname" >> interfaces ;; static) echo -e "\taddress $address" >> interfaces echo -e "\tnetmask $netmask" >> interfaces [ "$gateway" ] \ && echo -e "\tgateway $gateway" >> interfaces ;; esac echo "" >> interfaces done while [ "$answer" != "yes" ] && [ "$answer" != "no" ] ; do echon "Do you want to do any manual network configuration? [no] " default_read answer no done if [ "$answer" = "yes" ]; then case "$EDITOR" in nano) pkg_inst nano;; vim) pkg_inst vim;; esac ${EDITOR:-vi} interfaces fi mkdir -p $ROOT/etc/network cp interfaces $ROOT/etc/network/ } while getopts "hi" opt; do case $opt in h) usage;; i) STDINPUT=1;; esac done if [ "$STDINPUT" = "1" ]; then mkdir -p $ROOT/etc/network cat > $ROOT/etc/network/interfaces else prompt_for_interfaces fi