Function dhcp_request

scapy/layers/dhcp.py:553–606

Send a DHCP discover request and return the answer. Usage:: >>> dhcp_request() # send DHCP discover >>> dhcp_request(req_type='request', ... requested_addr='10.53.4.34') # send DHCP request

(hw=None,
                 req_type='discover',
                 server_id=None,
                 requested_addr=None,
                 hostname=None,
                 iface=None,
                 **kargs)

@conf.commands.register
def dhcp_request(hw=None,
                 req_type='discover',
                 server_id=None,
                 requested_addr=None,
                 hostname=None,
                 iface=None,
                 **kargs):
    """
    Send a DHCP discover request and return the answer.

    Usage::

        >>> dhcp_request()  # send DHCP discover
        >>> dhcp_request(req_type='request',
        ...              requested_addr='10.53.4.34')  # send DHCP request
    """
    if conf.checkIPaddr:
        warning(
            "conf.checkIPaddr is enabled, may not be able to match the answer"
        )
    if hw is None:
        if iface is None:
            iface = conf.iface
        hw = get_if_hwaddr(iface)
    dhcp_options = [
        ('message-type', req_type),
        ('client_id', b'\x01' + mac2str(hw)),
    ]
    if requested_addr is not None:
        dhcp_options.append(('requested_addr', requested_addr))
    elif req_type == 'request':
        warning("DHCP Request without requested_addr will likely be ignored")
    if server_id is not None:
        dhcp_options.append(('server_id', server_id))
    if hostname is not None:
        dhcp_options.extend([
            ('hostname', hostname),
            ('client_FQDN', b'\x00\x00\x00' + bytes_encode(hostname)),
        ])
    dhcp_options.extend([
        ('vendor_class_id', b'MSFT 5.0'),
        ('param_req_list', [
            1, 3, 6, 15, 31, 33, 43, 44, 46, 47, 119, 121, 249, 252
        ]),
        'end'
    ])
    return srp1(
        Ether(dst="ff:ff:ff:ff:ff:ff", src=hw) /
        IP(src="0.0.0.0", dst="255.255.255.255") /
        UDP(sport=68, dport=67) /
        BOOTP(chaddr=hw, xid=RandInt(), flags="B") /
        DHCP(options=dhcp_options),
        iface=iface, **kargs
    )


class BOOTP_am(AnsweringMachine):