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from socket import AF_INET, inet_ntop, inet_pton
from pyroute2.dhcp import Policy, dhcpmsg, option
from pyroute2.dhcp.enums.dhcp import Option
class dhcp4msg(dhcpmsg):
#
# https://www.ietf.org/rfc/rfc2131.txt
#
fields = (
('op', 'uint8', 1), # request
('htype', 'uint8', 1), # ethernet
('hlen', 'uint8', 6), # ethernet addr len
('hops', 'uint8'),
('xid', 'be32'),
('secs', 'be16'),
('flags', 'be16'),
('ciaddr', 'ip4addr'),
('yiaddr', 'ip4addr'),
('siaddr', 'ip4addr'),
('giaddr', 'ip4addr'),
('chaddr', 'l2paddr'),
('sname', '64s'),
('file', '128s'),
('cookie', '4s', b'c\x82Sc'),
)
#
# https://www.ietf.org/rfc/rfc2132.txt
#
options = (
# TODO: add & test more options
(Option.PAD, 'none'),
(Option.SUBNET_MASK, 'ip4addr'),
(Option.TIME_OFFSET, 'be32'),
(Option.ROUTER, 'ip4list'),
(Option.TIME_SERVER, 'ip4list'),
(Option.IEN_NAME_SERVER, 'ip4list'),
(Option.NAME_SERVER, 'ip4list'),
(Option.LOG_SERVER, 'ip4list'),
(Option.COOKIE_SERVER, 'ip4list'),
(Option.LPR_SERVER, 'ip4list'),
(Option.IMPRESS_SERVER, 'ip4list'),
(Option.RESOURCE_LOCATION_SERVER, 'ip4list'),
(Option.HOST_NAME, 'string'),
# in multiples of 512 bytes
(Option.BOOT_FILE_SIZE, 'be16'),
(Option.MERIT_DUMP_FILE, 'string'),
(Option.DOMAIN_NAME, 'string'),
(Option.SWAP_SERVER, 'ip4addr'),
(Option.ROOT_PATH, 'string'),
(Option.EXTENSIONS_PATH, 'string'),
(Option.IP_FORWARDING, 'bool'),
(Option.NON_LOCAL_SOURCE_ROUTING, 'bool'),
# TODO: dict of ip/mask pairs
# (Option.POLICY_FILTER, '?'),
# minimum legal value is 567 according to rfc
(Option.MAX_DATAGRAM_REASSEMBLY, 'be16'),
(Option.DEFAULT_TTL, 'uint8'),
(Option.PATH_MTU_AGING_TIMEOUT, 'be32'),
# TODO: list of be16
# (Option.PATH_MTU_PLATEAU_TABLE, '?'),
(Option.INTERFACE_MTU, 'be16'),
(Option.ALL_SUBNETS_LOCAL, 'bool'),
(Option.BROADCAST_ADDRESS, 'ip4addr'),
(Option.PERFORM_MASK_DISCOVERY, 'bool'),
(Option.MASK_SUPPLIER, 'bool'),
(Option.PERFORM_ROUTER_DISCOVERY, 'bool'),
(Option.ROUTER_SOLICITATION_ADDRESS, 'ip4addr'),
# TODO: dict of ip addrs
# (Option.STATIC_ROUTE, '?')
(Option.TRAILER_ENCAPSULATION, 'bool'),
(Option.ARP_CACHE_TIMEOUT, 'be32'),
(Option.ETHERNET_ENCAPSULATION, 'bool'),
(Option.TCP_DEFAULT_TTL, 'uint8'),
(Option.TCP_KEEPALIVE_INTERVAL, 'be32'),
(Option.TCP_KEEPALIVE_GARBAGE, 'bool'),
(Option.NIS_DOMAIN, 'string'),
(Option.NDS_SERVERS, 'ip4list'),
(Option.NTP_SERVERS, 'ip4list'),
(Option.VENDOR_SPECIFIC_INFORMATION, 'string'),
(Option.NETBIOS_NAME_SERVER, 'ip4list'),
(Option.NETBIOS_DDG_SERVER, 'ip4list'),
# 1=B, 2=P, 4=M, 8=H, probably obsolete & unused
(Option.NETBIOS_NODE_TYPE, 'uint8'),
(Option.NETBIOS_SCOPE, 'string'),
(Option.X_WINDOW_FONT_SERVER, 'ip4list'),
(Option.X_WINDOW_DISPLAY_MANAGER, 'ip4list'),
(Option.REQUESTED_IP, 'ip4addr'),
(Option.LEASE_TIME, 'sbe32'),
# 1: options in file, 2: options in sname, 4, both
(Option.OPTION_OVERLOAD, 'uint8'),
(Option.TFTP_SERVER_NAME, 'string'),
(Option.BOOTFILE_NAME, 'string'),
(Option.MESSAGE_TYPE, 'message_type'),
(Option.SERVER_ID, 'ip4addr'),
(Option.PARAMETER_LIST, 'array8'),
(Option.MESSAGE, 'string'),
# minimum value: 576 bytes
(Option.MAX_MSG_SIZE, 'be16'),
(Option.RENEWAL_TIME, 'sbe32'),
(Option.REBINDING_TIME, 'sbe32'),
(Option.VENDOR_ID, 'string'),
(Option.CLIENT_ID, 'client_id'),
(Option.END, 'none'),
)
class ip4addr(option):
policy = Policy(
format='4s',
encode=lambda x: inet_pton(AF_INET, x),
decode=lambda x: inet_ntop(AF_INET, x),
)
class ip4list(option):
policy = Policy(
format='string',
encode=lambda x: b''.join([inet_pton(AF_INET, i) for i in x]),
decode=lambda x: [
inet_ntop(AF_INET, x[i * 4 : i * 4 + 4])
for i in range(len(x) // 4)
],
)