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|
#!/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 <addr>/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 <addr>/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
|
