How to use the control.libexec.workspace-control.dhcp-conf-alter.InvalidInput function in control

log.debug("    gateway  = %s" % opts.gateway)

    # list of dns IPs
    opts.dns = []
    if opts.dnsstr:
        log.debug("    supplied dns servers: %s" % opts.dnsstr)
        dnsservers = opts.dnsstr.split(",")
        allvalid = True
        for server in dnsservers:
            if not IPRE.match(server):
                allvalid = False
                log.error("DNS server is not a valid address: %s" % server)
            else:
                opts.dns.append(server)
        if not allvalid:
            raise InvalidInput("all DNS servers must be valid IPs")
        log.debug("    validated dns servers = %s" % opts.dns)

    # [default_lease_time, max_lease_time]
    opts.leasetime = []
    if opts.leasetimestr:
        log.debug("    supplied leasetimes: %s" % opts.leasetimestr)
        times = opts.leasetimestr.split(",")
        if len(times) != 2:
            raise InvalidInput("only supply two lease times: default and max")
        try:
            x = int(times[0])
            if x < 1:
                raise InvalidInput("default lease time is less than one")
            y = int(times[1])
            if y < 1:
                raise InvalidInput("max lease time is less than one")

opts.dns.append(server)
        if not allvalid:
            raise InvalidInput("all DNS servers must be valid IPs")
        log.debug("    validated dns servers = %s" % opts.dns)

    # [default_lease_time, max_lease_time]
    opts.leasetime = []
    if opts.leasetimestr:
        log.debug("    supplied leasetimes: %s" % opts.leasetimestr)
        times = opts.leasetimestr.split(",")
        if len(times) != 2:
            raise InvalidInput("only supply two lease times: default and max")
        try:
            x = int(times[0])
            if x < 1:
                raise InvalidInput("default lease time is less than one")
            y = int(times[1])
            if y < 1:
                raise InvalidInput("max lease time is less than one")
            if x > y:
                raise InvalidInput("max lease time is greater than default...")
            opts.leasetime.append(x)
            opts.leasetime.append(y)
        except ValueError:
            raise InvalidInput("a lease time is not an integer")

        log.debug("    default lease time = %d" % opts.leasetime[0])
        log.debug("    max lease time     = %d" % opts.leasetime[1])

def validate(opts):

    actions = [opts.add, opts.remove]

    count = 0
    for action in actions:
        if action:
            count += 1

    if not count:
        raise InvalidInput("You must supply an action, see help (-h).")

    if count != 1:
        raise InvalidInput("You may only supply one action, see help (-h).")

    if opts.add:
        log.debug("---   action = add")
    elif opts.remove:
        log.debug("---   action = remove")

    if not opts.ipaddress:
        raise InvalidInput("You must supply an IP address, see help (-h).")

    if not IPRE.match(opts.ipaddress):
        raise InvalidInput("IP is not a valid address: %s" % opts.ipaddress)

    log.debug("   ipaddress = %s" % opts.ipaddress)

if opts.add:
        log.debug("---   action = add")
    elif opts.remove:
        log.debug("---   action = remove")

    if not opts.ipaddress:
        raise InvalidInput("You must supply an IP address, see help (-h).")

    if not IPRE.match(opts.ipaddress):
        raise InvalidInput("IP is not a valid address: %s" % opts.ipaddress)

    log.debug("   ipaddress = %s" % opts.ipaddress)

    if not opts.policyfile:
        raise InvalidInput("You must supply a DHCP configuration file to alter, see help (-h).")

    if not os.path.isabs(opts.policyfile):
        raise InvalidInput("You must specify the DHCP configuration file with an absolute path.")
    else:
        opts.policyfile = os.path.realpath(opts.policyfile)
        log.debug("  policyfile = %s" % opts.policyfile)

    if opts.add:
        if not opts.macaddress:
            raise InvalidInput("Add requires a MAC address, see help (-h).")
        else:
            if not MACRE.match(opts.macaddress):
                raise InvalidInput("MAC is not a valid address: %s" % opts.macaddress)
            log.debug("  macaddress = %s" % opts.macaddress)
        if not opts.hostname or opts.hostname.lower().strip() == 'none':
            raise InvalidInput("Add requires a hostname, see help (-h).")

def validate(opts):

    actions = [opts.add, opts.remove]

    count = 0
    for action in actions:
        if action:
            count += 1

    if not count:
        raise InvalidInput("You must supply an action, see help (-h).")

    if count != 1:
        raise InvalidInput("You may only supply one action, see help (-h).")

    if opts.add:
        log.debug("---   action = add")
    elif opts.remove:
        log.debug("---   action = remove")

    if not opts.ipaddress:
        raise InvalidInput("You must supply an IP address, see help (-h).")

    if not IPRE.match(opts.ipaddress):
        raise InvalidInput("IP is not a valid address: %s" % opts.ipaddress)

    log.debug("   ipaddress = %s" % opts.ipaddress)

    if not opts.policyfile:
        raise InvalidInput("You must supply a DHCP configuration file to alter, see help (-h).")

if not os.path.isabs(opts.policyfile):
        raise InvalidInput("You must specify the DHCP configuration file with an absolute path.")
    else:
        opts.policyfile = os.path.realpath(opts.policyfile)
        log.debug("  policyfile = %s" % opts.policyfile)

    if opts.add:
        if not opts.macaddress:
            raise InvalidInput("Add requires a MAC address, see help (-h).")
        else:
            if not MACRE.match(opts.macaddress):
                raise InvalidInput("MAC is not a valid address: %s" % opts.macaddress)
            log.debug("  macaddress = %s" % opts.macaddress)
        if not opts.hostname or opts.hostname.lower().strip() == 'none':
            raise InvalidInput("Add requires a hostname, see help (-h).")
        else:
            log.debug("    hostname = %s" % opts.hostname)

    if opts.subnetmask:
        if not IPRE.match(opts.subnetmask):
            raise InvalidInput("subnet is not a valid address (note that /# addresses are not supported yet): %s" % opts.subnetmask)
        log.debug("  subnetmask = %s" % opts.subnetmask)

    if opts.broadcast:
        if not IPRE.match(opts.broadcast):
            raise InvalidInput("broadcast is not a valid address: %s" % opts.broadcast)
        log.debug("   broadcast = %s" % opts.broadcast)

    if opts.gateway:
        if not IPRE.match(opts.gateway):
            raise InvalidInput("gateway is not a valid address: %s" % opts.gateway)