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Copy pathserver.py
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187 lines (171 loc) · 6.37 KB
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from socket import *
from sys import stderr
import binascii
def convertBytes(value, length):
#print(value)
strValue = hex(value)
strValue = strValue[2:]
while len(strValue) < length*2 :
strValue = '0' + strValue
valueBytes = b''
valueBytes = binascii.unhexlify(strValue)
#print(valueBytes)
return valueBytes
class DHCPDiscover:
def __init__(self, data):
self.xid = b''
self.mac = b''
self.data = data
self.unPack()
def unPack(self):
print('********** Receive DHCP Discover **********')
self.xid = self.data[4:8]
self.mac = self.data[28:34]
xid = ''.join(map(lambda x: "%02x" % x, data[4:8]))
mac = ':'.join(map(lambda x: "%02x" % x, data[28:34]))
key = ['TransactionID', 'macAddress']
val = [xid, mac]
for i in range (0, len(key), 1):
print(' {0:20s} : {1:15s}'.format(key[i], val[i]))
class DHCPOffer:
def __init__(self, data, offerIP, nextServerIP, subnetMask, router, leaseTime, DHCPServer, DNS1, DNS2, DNS3):
self.xid = data.xid
self.mac = data.mac
self.offerIP = offerIP
self.nextServerIP = nextServerIP
self.subnetMask = subnetMask
self.router = router
self.leaseTime = leaseTime
self.server = DHCPServer
self.DNS1 = DNS1
self.DNS2 = DNS2
self.DNS3 = DNS3
#print(self.xid)
#print(self.mac)
def sendPacket(self):
packet = b''
packet += b'\x02' #Message type: Boot Reply (2)
packet += b'\x01' #Hardware type: Ethernet
packet += b'\x06' #Hardware address length: 6
packet += b'\x00' #Hops: 0
packet += self.xid
packet += b'\x00\x00' #Seconds elapsed: 0
packet += b'\x80\x00' #Bootp flags: 0x8000 (Broadcast) + reserved flags
packet += inet_aton('0.0.0.0')
packet += inet_aton(self.offerIP)
packet += inet_aton(self.nextServerIP)
packet += inet_aton('0.0.0.0')
packet += self.mac
packet += b'\x00' * 10
packet += b'\x00' * 192
packet += b'\x63\x82\x53\x63' #Magic Cookie
packet += b'\x35\x01\x02' # Message Type(Option 53 len=1 type=2(offer))
packet += b'\x01\x04' #subnet mask
packet += inet_aton(self.subnetMask)
packet += b'\x03\x04' #router
packet += inet_aton(self.router) #router
packet += b'\x33\x04' #lease time
packet += convertBytes(self.leaseTime,4)
packet += b'\x36\x04' #DHCP server
packet += inet_aton(self.server)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS1)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS2)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS3)
return bytes(packet)
class DHCPRequest:
def __init__(self, data):
self.xid = b''
self.mac = b''
self.data = data
self.unPack()
def unPack(self):
print('********** Receive DHCP Request ***********')
self.xid = data[4:8]
self.mac = data[28:34]
print(' success!\n')
print('Wait for another client...')
#print (self.xid)
#print (self.mac)
class DHCPAck:
def __init__(self, data, offerIP, nextServerIP, subnetMask, router, leaseTime, DHCPServer, DNS1, DNS2, DNS3):
self.xid = data.xid
self.mac = data.mac
self.offerIP = offerIP
self.nextServerIP = nextServerIP
self.subnetMask = subnetMask
self.router = router
self.leaseTime = leaseTime
self.server = DHCPServer
self.DNS1 = DNS1
self.DNS2 = DNS2
self.DNS3 = DNS3
def sendPacket(self):
packet = b''
packet += b'\x02' #Message type: Boot Reply (2)
packet += b'\x01' #Hardware type: Ethernet
packet += b'\x06' #Hardware address length: 6
packet += b'\x00' #Hops: 0
packet += self.xid
packet += b'\x00\x00' #Seconds elapsed: 0
packet += b'\x00\x00' #Bootp flags: 0x8000 (Broadcast) + reserved flags
packet += inet_aton('0.0.0.0')
packet += inet_aton(self.offerIP)
packet += inet_aton(self.nextServerIP)
packet += inet_aton('0.0.0.0')
packet += self.mac
packet += b'\x00' * 10
packet += b'\x00' * 192
packet += b'\x63\x82\x53\x63' #Magic Cookie
packet += b'\x35\x01\x05' # Message Type(Option 53 len=1 type=5(ACK))
packet += b'\x01\x04' #subnet mask
packet += inet_aton(self.subnetMask)
packet += b'\x03\x04' #router
packet += inet_aton(self.router) #router
packet += b'\x33\x04' #lease time
packet += convertBytes(self.leaseTime,4)
packet += b'\x36\x04' #DHCP server
packet += inet_aton(self.server)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS1)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS2)
packet += b'\x07\x04' #DNS servers
packet += inet_aton(self.DNS3)
return bytes(packet)
if __name__ == "__main__":
offerIP = '192.168.1.100'
nextServerIP = '192.168.1.1'
subnetMask = '255.255.255.0'
router = '192.168.1.1'
leaseTime = 86400
DHCPServer = '192.168.1.1'
DNS1 = '9.7.10.15'
DNS2 = '9.7.10.16'
DNS3 = '9.7.10.18'
#define the socket
s = socket(AF_INET, SOCK_DGRAM) # internet, UDP
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1) # broadcast
s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
try:
s.bind(('', 67))
except Exception as msg:
stderr.write("%s\n" % msg)
else:
print('DHCP Server')
s.settimeout(10)
try:
while True:
data = s.recv(1024)
discoverPacket = DHCPDiscover(data)
offerPacket = DHCPOffer(discoverPacket,offerIP,nextServerIP,subnetMask,router,leaseTime,DHCPServer,DNS1,DNS2,DNS3)
s.sendto(offerPacket.sendPacket(), ('<broadcast>', 68))
data = s.recv(1024)
requestPacket = DHCPRequest(data)
ackPacket = DHCPAck(requestPacket,offerIP,nextServerIP,subnetMask,router,leaseTime,DHCPServer,DNS1,DNS2,DNS3)
s.sendto(ackPacket.sendPacket(), ('<broadcast>', 68))
except timeout as msg:
stderr.write("%s\n" % msg)
s.close()