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dhcpc_fsm_model.py
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dhcpc_fsm_model.py
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from random import randint
from scapy.all import *
from scapy.layers.dhcp import BOOTP, DHCP
from scapy.layers.inet import *
from scapy.utils import mac2str, hex_bytes
from socket import *
from dhcp_sup import *
from dhcpc_utils import NonBlockingQueueSimpleFactory
from state_machine import State, Event, acts_as_state_machine, after, before, InvalidStateTransition
logger = logging.getLogger('dhcp_client')
SRC_PORT = 68
DST_PORT = 67
DHCPC_PKT_RETRANS_TIME = 10
DHCPC_SHOW_BIND_TIME = 3
# fix part + [0 - 65535]
def randomMAC(serial=False):
if (not hasattr(randomMAC, 'rand')): #hasattr函数的第一个变量为当前函数名，第二个为变量名，加单引号
randomMAC.rand = 0
randomMAC.rand += 1
if (serial):
mac = [ 0x08, 0x00, 0x27,
0x00,
randomMAC.rand >> 8 & 0xff,
randomMAC.rand & 0xff
]
else:
mac = [
0x08, 0x00, 0x27,
random.randint(0x00, 0xff),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff)
]
return ':'.join(map(lambda x: "%02x" % x, mac))
class DHCPC_PKT_CFG():
def __init__(self, pkt_cfg) -> None:
self.pkt_cfg = pkt_cfg
def get_op(self):
return self.pkt_cfg.get_op()
def get_htype(self):
return self.pkt_cfg.get_htype()
def get_hops(self):
return self.pkt_cfg.get_hops()
def get_xid(self):
return self.pkt_cfg.get_xid()
def get_secs(self):
return self.pkt_cfg.get_secs()
def get_flags(self)->str:
return self.pkt_cfg.get_flags()
def get_ciaddr(self)->str:
return self.pkt_cfg.get_ciaddr()
def get_yiaddr(self)->str:
return self.pkt_cfg.get_yiaddr()
def get_giaddr(self)->str:
return self.pkt_cfg.get_giaddr()
def get_chaddr(self)->str:
return self.pkt_cfg.get_chaddr()
def get_sname(self):
return self.pkt_cfg.get_sname()
def get_file(self):
return self.pkt_cfg.get_file()
def get_ops(self):
return self.pkt_cfg.get_ops()
class DHCPC_ENTRY_INST():
_giaddr_map = {}
def __init__(self, mode, pkt_cfg):
self.mode = mode
self.pkt_cfg = pkt_cfg
self.fixxid = False
self.req_attr = {
'giaddr' : None,
'xid' : None,
'mac' : None,
'chaddr' : None,
'hostname' : 'nbk',
'interval' : 10, # 重传时间，暂时没用到，目前统一重传
'req_list' : [1, 2, 3, 6, 12, 15, 17, 26, 28, 33, 40 , 41, 42, 121, 119, 249, 252],
}
self.get_attr = { 'server_id' : None,
'get_ip' : None,
}
@property
def giaddr_mac(self):
if self.req_attr['giaddr'] is None:
return None
if self.req_attr['giaddr'] in DHCPC_ENTRY_INST._giaddr_map:
return DHCPC_ENTRY_INST._giaddr_map[self.req_attr['giaddr']]
else:
DHCPC_ENTRY_INST._giaddr_map[self.req_attr['giaddr']] = randomMAC()
return DHCPC_ENTRY_INST._giaddr_map[self.req_attr['giaddr']]
def get_attr_by_dhcp(self, pkt):
for mess in pkt['DHCP options'].options:
if (len(mess) == 2 and mess[0] == "server_id"):
self.get_attr['server_id'] = mess[1]
self.get_attr['get_ip'] = pkt[BOOTP].yiaddr
def gen_request(self):
dhcp_pkt = DHCP(options=[("message-type", "request"),
("client_id", hex_bytes('01')+self.req_attr['chaddr']),
("param_req_list", self.req_attr['req_list']),
("max_dhcp_size", 576),
("hostname", self.req_attr['hostname']),
("requested_addr", self.get_attr['get_ip']),
("server_id", self.get_attr['server_id']),
"end"])
bootp_pkt = BOOTP(chaddr = self.req_attr['chaddr'], xid = self.req_attr['xid'], yiaddr = self.get_attr['get_ip'], flags=0x8000)
udp_header = UDP(sport=SRC_PORT, dport=DST_PORT)
ip_header = IP(src = ZERO_IP, dst = BROADSTCAST_IP)
eth_header = Ether(src = self.req_attr['mac'], dst=BROADSTCAST_MAC)
if self.req_attr['giaddr'] != None:
return Ether(src = self.giaddr_mac, dst=BROADSTCAST_MAC) / IP(src = self.req_attr['giaddr'], dst = BROADSTCAST_IP) / udp_header / \
BOOTP(chaddr = self.req_attr['chaddr'], xid = self.req_attr['xid'], yiaddr = self.get_attr['get_ip'], giaddr = self.req_attr['giaddr'], flags=0x8000) \
/ dhcp_pkt
return eth_header / ip_header / udp_header / bootp_pkt / dhcp_pkt
def gen_discover(self):
if self.mode == 1:
return self.gen_detail_pkt(self.pkt_cfg)
if self.req_attr['mac'] is None:
self.req_attr['mac'] = randomMAC()
if self.fixxid is not True:
self.req_attr['xid'] = randint(0, 0xffffffff)
self.req_attr['chaddr'] = mac2str(self.req_attr['mac'])
dhcp_pkt = DHCP(options=[("message-type", "discover"),
("client_id", hex_bytes('01')+self.req_attr['chaddr']),
("param_req_list", self.req_attr['req_list']),
("max_dhcp_size", 576),
("hostname", self.req_attr['hostname']),
("vendor_class_id", None),
"end"])
bootp_pkt = BOOTP(chaddr=self.req_attr['chaddr'], xid=self.req_attr['xid'], flags=0x8000)
udp_header = UDP(sport=SRC_PORT, dport=DST_PORT)
ip_header = IP(src = ZERO_IP, dst = BROADSTCAST_IP)
eth_header = Ether(src = self.req_attr['mac'], dst=BROADSTCAST_MAC)
if self.req_attr['giaddr'] != None:
# DhcpcControlCenter.sup.add_dhcp_bind(self.req_attr['giaddr'], self.giaddr_mac)
return Ether(src = self.giaddr_mac, dst=BROADSTCAST_MAC) / IP(src = self.req_attr['giaddr'], dst = BROADSTCAST_IP) / udp_header / \
BOOTP(chaddr=self.req_attr['chaddr'], xid=self.req_attr['xid'], giaddr = self.req_attr['giaddr'], flags=0x8000) \
/ dhcp_pkt
return eth_header / ip_header / udp_header / bootp_pkt / dhcp_pkt
def set_options(self, ops):
options = [
("subnet_mask", ops[1]),
("time_zone", int(ops[2]) if ops[2] else None),
("router", ops[3]),
("time_server", ops[4]),
("IEN_name_server", ops[5]),
("name_server", ops[6]),
("log_server", ops[7]),
("cookie_server", ops[8]),
("lpr_server", ops[9]),
("impress-servers", ops[10]),
("resource-location-servers", ops[11]),
("hostname", ops[12]),
("boot-size", int(ops[13]) if ops[13] else None),
# ("dump_path", ops[14]),
# ("domain", ops[15]),
("swap-server", ops[16]),
# ("root_disk_path", ops[17]),
# ("extensions-path", ops[18]),
("ip-forwarding", int(ops[19]) if ops[19] else None),
("non-local-source-routing", int(ops[20]) if ops[20] else None),
("policy-filter", ops[21]),
("max_dgram_reass_size", int(ops[22]) if ops[22] else None),
("default_ttl", int(ops[23]) if ops[23] else None),
("pmtu_timeout", int(ops[24]) if ops[24] else None),
("path-mtu-plateau-table", int(ops[25]) if ops[25] else None),
("interface-mtu", int(ops[26]) if ops[26] else None),
("all-subnets-local", int(ops[27]) if ops[27] else None),
("broadcast_address", ops[28]),
("perform-mask-discovery", int(ops[29]) if ops[29] else None),
("mask-supplier", int(ops[30]) if ops[30] else None),
("router-discovery", int(ops[31]) if ops[31] else None),
("router-solicitation-address", ops[32]),
("static-routes", ops[33]),
("trailer-encapsulation", int(ops[34]) if ops[34] else None),
("arp_cache_timeout", int(ops[35]) if ops[35] else None),
("ieee802-3-encapsulation", int(ops[36]) if ops[36] else None),
("tcp_ttl", int(ops[37]) if ops[37] else None),
("tcp_keepalive_interval", int(ops[38]) if ops[38] else None),
("tcp_keepalive_garbage", int(ops[39]) if ops[39] else None),
("NIS_domain", ops[40]),
("NIS_server", ops[41]),
("NTP_server", ops[42]),
# ("vendor_specific", ops[43]),
("NetBIOS_server", ops[44]),
("NetBIOS_dist_server", ops[45]),
("NetBIOS_node_type", int(ops[46]) if ops[46] else None),
# ("netbios-scope", ops[47]),
("font-servers", ops[48]),
("x-display-manager", ops[49]),
("requested_addr", ops[50]),
("lease_time", int(ops[51]) if ops[51] else None),
("dhcp-option-overload", int(ops[52]) if ops[52] else None),
("message-type", ops[53]),
("server_id", ops[54]),
("param_req_list", [int(x) for x in ops[55].split(",")]),
# ("error_message", ops[56]),
("max_dhcp_size", int(ops[57]) if ops[57] else None),
("renewal_time", int(ops[58]) if ops[58] else None),
("rebinding_time", int(ops[59]) if ops[59] else None),
("vendor_class_id", ops[60]),
("client_id", ops[61]),
# ("nwip-domain-name", ops[62]),
# ("NISplus_domain", ops[64]),
("NISplus_server", ops[65]),
# ("tftp_server_name", ops[66]),
("boot-file-name", ops[67]),
("mobile-ip-home-agent", ops[68]),
("SMTP_server", ops[69]),
("POP3_server", ops[70]),
("NNTP_server", ops[71]),
("WWW_server", ops[72]),
("Finger_server", ops[73]),
("IRC_server", ops[74]),
("StreetTalk_server", ops[75]),
("StreetTalk_Dir_Assistance", ops[76]),
# ("user_class", ops[77]),
# ("slp_service_agent", ops[78]),
# ("slp_service_scope", ops[79]),
# ("client_FQDN", ops[81]),
# ("relay_agent_information", ops[82]),
("nds-server", ops[85]),
("nds-tree-name", ops[86]),
("nds-context", ops[87]),
# ("bcms-controller-namesi", ops[88]),
# ("bcms-controller-address", ops[89]),
("client-last-transaction-time", int(ops[91]) if ops[91] else None),
("associated-ip", ops[92]),
# pxe_client_architecture ops[93]
# ("pxe_client_network_interface", ops[94]),
# ("pxe_client_machine_identifier", ops[97]),
("uap-servers", ops[98]),
("pcode", ops[100]),
("tcode", ops[101]),
("netinfo-server-address", ops[112]),
("netinfo-server-tag", ops[113]),
("default-url", ops[114]),
("auto-config", int(ops[116]) if ops[116] else None),
("name-service-search", int(ops[117]) if ops[117] else None),
# ("vendor_class", ops[118]),
("subnet-selection", ops[124]),
# ("vendor_specific_information", ops[125]),
("tftp_server_ip_address", ops[128]),
("pana-agent", ops[136]),
# ("v4-lost", ops[137]),
("capwap-ac-v4", ops[138]),
# ("sip_ua_service_domains", ops[141]),
# ("rdnss-selection", ops[146]),
("tftp_server_address", ops[150]),
# ("v4-portparams", ops[159]),
("v4-captive-portal", ops[160]),
("mud-url", ops[161]),
# ("pxelinux_magic", ops[208]),
# ("pxelinux_configuration_file", ops[209]),
# ("pxelinux_path_prefix", ops[210]),
# ("pxelinux_reboot_time", ops[211]),
# ("option-6rd", ops[212]),
# ("v4-access-domain", ops[213]),
"end"
]
re_options = list()
for v in options:
if (type(v) == tuple):
if v[1] != None and v[1] != '':
re_options.append(v)
re_options.append("end")
return re_options
def gen_detail_pkt(self, pkt_cfg:DHCPC_PKT_CFG):
self.req_attr['mac'] = pkt_cfg.get_chaddr()
self.req_attr['xid'] = pkt_cfg.get_xid()
self.req_attr['chaddr'] = mac2str(self.req_attr['mac'])
ops = pkt_cfg.get_ops()
if (ops[53]):
msgtype = ops[53]
else:
logger.debug("ERROR message-type")
return None
if (ops[55]):
self.req_attr['req_list'] = [int(x) for x in ops[55].split(",")]
max_dhcp_size = 576
if (ops[57]):
max_dhcp_size = int(ops[57])
if (ops[12]):
self.req_attr['hostname'] = ops[12]
flags = 0x0
if (pkt_cfg.get_flags() == "broadcast"):
flags = 0x8000
dhcp_pkt = DHCP(options=self.set_options(ops))
bootp_pkt = BOOTP(chaddr=self.req_attr['chaddr'], xid=self.req_attr['xid'], flags=flags)
udp_header = UDP(sport=SRC_PORT, dport=DST_PORT)
ip_header = IP(src = ZERO_IP, dst = BROADSTCAST_IP)
eth_header = Ether(src = self.req_attr['mac'], dst=BROADSTCAST_MAC)
if self.req_attr['giaddr'] != None:
# DhcpcControlCenter.sup.add_dhcp_bind(self.req_attr['giaddr'], self.giaddr_mac)
return Ether(src = self.giaddr_mac, dst=BROADSTCAST_MAC) / IP(src = self.req_attr['giaddr'], dst = BROADSTCAST_IP) / udp_header / \
BOOTP(chaddr=self.req_attr['chaddr'], xid=self.req_attr['xid'], giaddr = self.req_attr['giaddr'], flags=0x8000) \
/ dhcp_pkt
pkt = eth_header / ip_header / udp_header / bootp_pkt / dhcp_pkt
return pkt
class DhcpcBindsEntryInfo():
def __init__(self, ip, mac) -> None:
self.ip = ip
self.mac = mac
class DHCPC_ENTRY_FSM_MSG():
def __init__(self, func) -> None:
self.func = func
@acts_as_state_machine
class DHCPC_ENTRY_FSM():
nty_userbind_gen_cb = None
non_userbind_cb = None
max_retrans_times = 3
__entry_id = 0
dhcpc_que = NonBlockingQueueSimpleFactory.create_nonblockingqueue("realize")
INIT = State(initial=True)
SELECTING = State()
REQUESTING = State()
BOUND = State()
# [TODO]
# RENEWING = State()
# REBINDING = State()
# INIT_REBOOT = State()
# REBOOTING = State()
fsm_start = Event(from_states=(INIT, SELECTING, REQUESTING), to_state=SELECTING)
resend_discoverpkt = Event(from_states=SELECTING, to_state=SELECTING)
fsm_select = Event(from_states=SELECTING, to_state=SELECTING)
fsm_selected = Event(from_states=SELECTING, to_state=REQUESTING)
resend_requestpkt = Event(from_states=REQUESTING, to_state=REQUESTING)
fsm_noreply = Event(from_states=(SELECTING, REQUESTING, BOUND), to_state=INIT)
fsm_bound = Event(from_states=REQUESTING, to_state=BOUND)
fsm_admin_down = Event(from_states=(SELECTING, REQUESTING, BOUND), to_state=INIT)
@after('fsm_admin_down')
def _(self):
logger.debug("admin down")
self.clear_flag = True
@after('fsm_noreply')
def _(self):
self.retrans_times = 0
@after('fsm_start')
def _(self):
logger.debug("send a discover")
self.retrans_times = 0
self.gen_pkt = self.entry.gen_discover()
DHCPC_ENTRY_FSM.dhcpc_retrans_check(self)
sendp(self.gen_pkt, iface = conf.iface, verbose = False)
@after('resend_discoverpkt')
def _(self):
self.retrans_times += 1
if (self.retrans_times > DHCPC_ENTRY_FSM.max_retrans_times):
self.fsm_start()
return
sendp(self.gen_pkt, iface = conf.iface, verbose = False)
@after('fsm_select')
def _(self):
logger.debug("select a offer")
self.fsm_selected()
@after('resend_requestpkt')
def _(self):
self.retrans_times += 1
if (self.retrans_times > DHCPC_ENTRY_FSM.max_retrans_times):
self.fsm_start()
return
sendp(self.gen_pkt, iface = conf.iface, verbose = False)
@after('fsm_selected')
def _(self):
logger.debug("send a request")
self.retrans_times = 0
self.entry.get_attr_by_dhcp(self.rc_pkt)
self.gen_pkt = self.entry.gen_request()
sendp(self.gen_pkt, iface = conf.iface, verbose = False)
@before('fsm_bound')
def _(self):
logger.debug("recv ack")
self.entry.get_attr_by_dhcp(self.rc_pkt)
self.entry.req_attr['xid'] = 0x0
# if (sth is wrong):
# [TODO]
@after('fsm_bound')
def _(self):
logger.debug("do bound")
DHCPC_ENTRY_FSM.nty_userbind_gen_cb(self.entry)
DHCPC_ENTRY_FSM.dhcpc_retrans_check(self)
def __init__(self, mode, pkt_cfg) -> None:
DHCPC_ENTRY_FSM.__entry_id += 1
self.id = DHCPC_ENTRY_FSM.__entry_id
self.entry = DHCPC_ENTRY_INST(mode, pkt_cfg)
self.rc_pkt = None
self.gen_pkt = None
self.retrans_times = 0
self.clear_flag = False
def set_nty_userbind_gen_cb(cb):
DHCPC_ENTRY_FSM.nty_userbind_gen_cb = cb
def set_dhcpc_retrans_check(cb):
DHCPC_ENTRY_FSM.dhcpc_retrans_check = cb
def get_current_state(self):
return self.current_state
def start(self):
if (self.get_current_state() == "BOUND"):
return
self.fsm_start()
def stop(self):
DHCPC_ENTRY_FSM.join_event_queue(self.fsm_admin_down)
def bound_show(self):
if (self.get_current_state() == "BOUND"):
logger.debug("local bound, id:%d :ip(%s), mac(%s), server(%s)\n" % (self.id, self.entry.get_attr['get_ip'], self.entry.req_attr['mac'], self.entry.get_attr['server_id']))
# thread safe
def join_event_queue(func):
DHCPC_ENTRY_FSM.dhcpc_que.put(DHCPC_ENTRY_FSM_MSG(func))
def fsm_event_queue_process():
DHCPC_ENTRY_FSM.dhcpc_que.foreach(DHCPC_ENTRY_FSM.deal_fsm_event_cb)
PseudoThread.async_run_later_event(DHCPC_ENTRY_FSM.fsm_event_queue_process, 0.1)
def get_fsm_event():
return DHCPC_ENTRY_FSM.dhcpc_que.get()
def deal_fsm_event_cb(msg:DHCPC_ENTRY_FSM_MSG):
if msg and msg.func:
try:
# [TODO] if (self.clear_flag): return
msg.func()
except InvalidStateTransition as err:
pass