def __dhcp4_client(self):
""" Obtain IPv4 address and default gateway using DHCP """
def __send_dhcp_packet(dhcp_packet_tx):
socket.send_to(
UdpMetadata(
local_ip_address=IPv4Address("0.0.0.0"),
local_port=68,
remote_ip_address=IPv4Address("255.255.255.255"),
remote_port=67,
raw_data=dhcp_packet_tx.get_raw_packet(),
))
socket = UdpSocket()
socket.bind(local_ip_address="0.0.0.0", local_port=68)
dhcp_xid = random.randint(0, 0xFFFFFFFF)
# Send DHCP Discover
__send_dhcp_packet(dhcp_packet_tx=ps_dhcp.DhcpPacket(
dhcp_xid=dhcp_xid,
dhcp_chaddr=self.mac_unicast,
dhcp_msg_type=ps_dhcp.DHCP_DISCOVER,
dhcp_param_req_list=
b"\x01\x1c\x02\x03\x0f\x06\x77\x0c\x2c\x2f\x1a\x79\x2a",
dhcp_host_name="PyTCP",
))
self.logger.debug("Sent out DHCP Discover message")
# Wait for DHCP Offer
if not (packet := socket.receive_from(timeout=5)):
self.logger.warning("Timeout waiting for DHCP Offer message")
socket.close()
return None, None
dhcp_xid=dhcp_xid,
dhcp_chaddr=self.mac_unicast,
dhcp_msg_type=ps_dhcp.DHCP_DISCOVER,
dhcp_param_req_list=
b"\x01\x1c\x02\x03\x0f\x06\x77\x0c\x2c\x2f\x1a\x79\x2a",
dhcp_host_name="PyTCP",
))
self.logger.debug("Sent out DHCP Discover message")
# Wait for DHCP Offer
if not (packet := socket.receive_from(timeout=5)):
self.logger.warning("Timeout waiting for DHCP Offer message")
socket.close()
return None, None
dhcp_packet_rx = ps_dhcp.DhcpPacket(packet.raw_data)
if dhcp_packet_rx.dhcp_msg_type != ps_dhcp.DHCP_OFFER:
self.logger.warning("Didn't receive DHCP Offer message")
socket.close()
return None, None
dhcp_srv_id = dhcp_packet_rx.dhcp_srv_id
dhcp_yiaddr = dhcp_packet_rx.dhcp_yiaddr
self.logger.debug(
f"ClientUdpDhcp: Received DHCP Offer from {dhcp_packet_rx.dhcp_srv_id}"
+
f"IP: {dhcp_packet_rx.dhcp_yiaddr}, Mask: {dhcp_packet_rx.dhcp_subnet_mask}, Router: {dhcp_packet_rx.dhcp_router}"
+
f"DNS: {dhcp_packet_rx.dhcp_dns}, Domain: {dhcp_packet_rx.dhcp_domain_name}"
)