source: freewrt/package/base-files/default/etc/functions.sh@ 9e3d21f

#!/bin/ash

alias debug=${DEBUG:-:}

# valid interface?
if_valid() (
        ifconfig "$1" >&- 2>&- ||
        [ "${1%%[0-9]}" = br ] || {
                [ "${1%%[0-9]}" = vlan ] && (
                        i=${1#vlan}
                        hwname=$(nvram get vlan${i}hwname)
                        hwaddr=$(nvram get ${hwname}macaddr)
                        [ -z "$hwaddr" ] && return 1

                        vif=$(ifconfig -a | awk \
                            '/^eth.*'$hwaddr'/ {print $1; exit}' IGNORECASE=1)
                        debug "# vlan$i => $vif"

                        $DEBUG ifconfig $vif up
                        $DEBUG vconfig add $vif $i 2>&-
                )
        } || { debug "# missing interface '$1' ignored"; false; }
)

do_ifup() {
        if_proto=$(nvram get ${2}_proto)
        if=$(nvram get ${2}_ifname)
        [ "${if%%[0-9]}" = ppp ] && if=$(nvram get ${2}_device)

        pidfile=/var/run/${if}.pid
        [ -f $pidfile ] && $DEBUG kill $(<$pidfile)

        case $1 in
        static)
                ip=$(nvram get ${2}_ipaddr)
                netmask=$(nvram get ${2}_netmask)
                gateway=$(nvram get ${2}_gateway)
                mtu=$(nvram get ${2}_mtu)
                static_route=$(nvram get ${2}_static_route)

                $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} ${mtu:+mtu $(($mtu))} broadcast + up
                ${gateway:+$DEBUG route add default gw $gateway}

                [ -n "$static_route" ] && for route in $static_route; do
                        eval "set $(echo $route | sed 's/:/ /g')"
                        [ "$2" = "255.255.255.255" ] && opt=-host
                        $DEBUG route add ${opt:-"-net"} $1 netmask $2 gw $3 metric $4
                done

                [ -f /etc/resolv.conf ] || {
                        debug "# --- creating /etc/resolv.conf ---"
                        for dns in $(nvram get ${2}_dns); do
                                echo "nameserver $dns" >>/etc/resolv.conf
                        done
                }

                env -i ACTION=ifup INTERFACE="${2}" PROTO=static /sbin/hotplug iface &
                ;;
        dhcp)
                DHCP_IP=$(nvram get ${2}_ipaddr)
                DHCP_NETMASK=$(nvram get ${2}_netmask)
                mtu=$(nvram get ${2}_mtu)
                $DEBUG ifconfig $if $ip ${netmask:+netmask $netmask} ${mtu:+mtu $(($mtu))} broadcast + up

                DHCP_ARGS="-i $if ${DHCP_IP:+-r $DHCP_IP} -b -p $pidfile"
                DHCP_HOSTNAME=$(nvram get ${2}_hostname)
                DHCP_HOSTNAME=${DHCP_HOSTNAME%%.*}
                [ -z $DHCP_HOSTNAME ] || DHCP_ARGS="$DHCP_ARGS -H $DHCP_HOSTNAME"
                [ "$if_proto" = pptp ] && DHCP_ARGS="$DHCP_ARGS -n -q" || DHCP_ARGS="$DHCP_ARGS -R &"
                [ -r $pidfile ] && oldpid=$(<$pidfile)
                ${DEBUG:-eval} "udhcpc $DHCP_ARGS"
                [ -n "$oldpid" ] && pidof udhcpc | grep "$oldpid" >&- 2>&- && {
                        sleep 1
                        kill -9 $oldpid
                }
                # hotplug events are handled by /usr/share/udhcpc/default.script
                ;;
        none|"")
                ;;
        *)
                [ -x "/sbin/ifup.$1" ] && { $DEBUG /sbin/ifup.$1 ${2}; exit; }
                echo "### ifup ${2}: ignored ${2}_proto=\"$1\" (not supported)"
                ;;
        esac
}

load_modules() {
        sed 's/^[^#]/insmod &/' $* | ash 2>&- || :
}

user_exists() {
        grep -q "^$1:" $IPKG_INSTROOT/etc/passwd 2>&-
        return $?
}

group_exists() {
        grep -q "^$1:" $IPKG_INSTROOT/etc/group 2>&-
        return $?
}

service_exists() {
        grep -q "^$1[[:space:]]*$2" $IPKG_INSTROOT/etc/services 2>&-
        return $?
}

rcconf_exists() {
        grep -q "$1" $IPKG_INSTROOT/etc/rc.conf 2>&-
        return $?
}

add_user() {
        user_exists $1 || {
                echo "adding user $1 to /etc/passwd"
                echo "$1:x:$2:${3:-$2}:$1:${4:-/tmp}:${5:-/bin/false}" \
                    >>$IPKG_INSTROOT/etc/passwd
        }
}

add_group() {
        group_exists $1 || {
                echo "adding group $1 to /etc/group"
                echo "$1:x:$2:$3" >>$IPKG_INSTROOT/etc/group
        }
}

add_service() {
        service_exists $1 $2 || {
                echo "adding service $1 to /etc/services"
                echo -e "$1\t$2" >>$IPKG_INSTROOT/etc/services
        }
}

add_rcconf() {
        rcconf_exists $1 $2 || {
                 echo "adding service $1 to /etc/rc.conf"
                 echo -e "$2" >>$IPKG_INSTROOT/etc/rc.conf
        }
}

get_next_uid() {
        uid=$(grep -v -e ^nobody: -e ^admin: $IPKG_INSTROOT/etc/passwd | \
            tail -n 1 | awk -F : '{ print $3 }')
        echo $((uid+1))
}

get_next_gid() {
        gid=$(grep -v -e ^nogroup: -e ^admin: $IPKG_INSTROOT/etc/group | \
            tail -n 1 | awk -F : '{ print $3 }')
        echo $((gid+1))
}