def check_dhcp_on_eth(iface, timeout):
"""Check if there is roque dhcp server in network on given iface
@iface - name of the ethernet interface
@timeout - scapy timeout for waiting on response
>>> check_dhcp_on_eth('eth1')
"""
scapy.conf.iface = iface
scapy.conf.checkIPaddr = False
dhcp_options = [("message-type", "discover"),
("param_req_list", utils.format_options(
[1, 2, 3, 4, 5, 6,
11, 12, 13, 15, 16, 17, 18, 22, 23,
28, 40, 41, 42, 43, 50, 51, 54, 58, 59, 60, 66, 67])),
"end"]
fam, hw = scapy.get_if_raw_hwaddr(iface)
dhcp_discover = (
scapy.Ether(src=hw, dst="ff:ff:ff:ff:ff:ff") /
scapy.IP(src="0.0.0.0", dst="255.255.255.255") /
scapy.UDP(sport=68, dport=67) /
scapy.BOOTP(chaddr=hw) /
scapy.DHCP(options=dhcp_options))
ans, unans = scapy.srp(dhcp_discover, multi=True,
nofilter=1, timeout=timeout, verbose=0)
return ans
def check_dhcp_on_eth(iface, timeout):
"""Check if there is roque dhcp server in network on given iface
@iface - name of the ethernet interface
@timeout - scapy timeout for waiting on response
>>> check_dhcp_on_eth('eth1')
"""
conf.iface = iface
conf.checkIPaddr = False
dhcp_options = [("message-type", "discover"),
("param_req_list",
utils.format_options([
1, 2, 3, 4, 5, 6, 11, 12, 13, 15, 16, 17, 18, 22, 23,
28, 40, 41, 42, 43, 50, 51, 54, 58, 59, 60, 66, 67
])), "end"]
fam, hw = get_if_raw_hwaddr(iface)
dhcp_discover = (Ether(src=hw, 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=hw) /
DHCP(options=dhcp_options))
ans, unans = srp(dhcp_discover,
multi=True,
nofilter=1,
timeout=timeout,
verbose=0)
return ans
def _get_dhcp_discover_message(iface):
dhcp_options = [("message-type", "discover"),
("param_req_list",
utils.format_options([
1, 2, 3, 4, 5, 6, 11, 12, 13, 15, 16, 17, 18, 22, 23,
28, 40, 41, 42, 43, 50, 51, 54, 58, 59, 60, 66, 67
])), "end"]
fam, hw = scapy.get_if_raw_hwaddr(iface)
dhcp_discover = (scapy.Ether(src=hw, dst="ff:ff:ff:ff:ff:ff") /
scapy.IP(src="0.0.0.0", dst="255.255.255.255") /
scapy.UDP(sport=68, dport=67) / scapy.BOOTP(chaddr=hw) /
scapy.DHCP(options=dhcp_options))
return dhcp_discover
def _get_dhcp_discover_message(iface):
dhcp_options = [("message-type", "discover"),
("param_req_list", utils.format_options(
[1, 2, 3, 4, 5, 6,
11, 12, 13, 15, 16, 17, 18, 22, 23,
28, 40, 41, 42, 43, 50, 51, 54, 58, 59, 60, 66, 67])),
"end"]
fam, hw = scapy.get_if_raw_hwaddr(iface)
dhcp_discover = (
scapy.Ether(src=hw, dst="ff:ff:ff:ff:ff:ff") /
scapy.IP(src="0.0.0.0", dst="255.255.255.255") /
scapy.UDP(sport=68, dport=67) /
scapy.BOOTP(chaddr=hw) /
scapy.DHCP(options=dhcp_options))
return dhcp_discover
