OpenWrt – Rev 4

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#!/bin/sh
. /lib/functions.sh
. /lib/netifd/netifd-proto.sh

find_3g_iface() {
        local cfg="$1"
        local tty="$2"

        local proto
        config_get proto "$cfg" proto
        [ "$proto" = 3g ] || [ "$proto" = ncm ] || return 0

        # bypass state vars here because 00-netstate could clobber .device
        local dev=$(uci_get network "$cfg" device)

        if [ "${dev##*/}" = "${tty##*/}" ]; then
                if [ "$ACTION" = add ]; then
                        available=1
                else
                        available=0
                fi
                proto_set_available "$cfg" $available
        fi
}

case "$DEVICENAME" in
        tty*)
                [ -e "/dev/$DEVICENAME" ] || [ "$ACTION" = remove ] || exit 0
                config_load network
                config_foreach find_3g_iface interface "/dev/$DEVICENAME"
        ;;
esac