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import sys
from scapy.all import *
def p(s):
print 'DHCP client: {}'.format(s)
def main(argv):
src_mac = argv[1]
dhcp_src = argv[2]
# needed for scapy not to match replies since DHCP uses broadcast addresses
# which wouldn't work
conf.checkIPaddr = False
while True:
discover = Ether(dst='ff:ff:ff:ff:ff:ff', src=src_mac)/ \
IP(src='0.0.0.0', dst='255.255.255.255')/ \
UDP(dport=67,sport=68)/ \
BOOTP(op=1, chaddr=src_mac)/ \
DHCP(options=[('message-type', 'discover'), ('end')])
ans,unans = srp(discover, timeout=3)
for snd,rcv in ans:
if rcv[IP].src == dhcp_src:
exit(0)
else:
p('Unexpected DHCP packet source address! ({})'.format(rcv[IP].src))
exit(1)
if __name__ == "__main__":
main(sys.argv)
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