dhcpc.py

#!/usr/bin/env python

from scapy.all import *

conf.checkIPaddr=False

# configuration
localiface = 'en0'
myhostname='vektor'
localmac = get_if_hwaddr(localiface)

# craft DHCP DISCOVER
dhcp_discover = Ether(src=localmac, dst='ff:ff:ff:ff:ff:ff')/IP(src='0.0.0.0', dst='255.255.255.255')/UDP(dport=67, sport=68)/BOOTP(chaddr="8c859039f517",xid=RandInt())/DHCP(options=[('message-type', 'discover'), 'end'])
print(dhcp_discover.display())

# send discover, wait for reply
dhcp_offer = srp1(dhcp_discover,iface=localiface)
print(dhcp_offer.display())

# craft DHCP REQUEST from DHCP OFFER
myip=dhcp_offer[BOOTP].yiaddr
sip=dhcp_offer[BOOTP].siaddr
xid=dhcp_offer[BOOTP].xid
dhcp_request = Ether(src=localmac,dst="ff:ff:ff:ff:ff:ff")/IP(src="0.0.0.0",dst="255.255.255.255")/UDP(sport=68,dport=67)/BOOTP(chaddr="8c859039f517",xid=xid)/DHCP(options=[("message-type","request"),("server_id",sip),("requested_addr",myip),("hostname",myhostname),("param_req_list","pad"),"end"])
print(dhcp_request.display())

# send request, wait for ack
dhcp_ack = srp1(dhcp_request,iface=localiface)
print(dhcp_ack.display())