def getICMPPacket(self):
"""
构造ICMP报文
:return:
"""
try:
icmp_packet = IP() / ICMP()
icmp_packet.version = int(self.entries[2].get())
icmp_packet.id = int(self.entries[3].get())
icmp_packet.flags = int(self.entries[4].get())
icmp_packet.frag = int(self.entries[5].get())
icmp_packet.ttl = int(self.entries[6].get())
# ip_packet.chksum = str(self.entries[7].get())
icmp_packet.src = str(self.entries[8].get())
icmp_packet.dst = str(self.entries[9].get())
icmp_packet.type = int(self.entries[0].get())
# icmp_packet.chksum = str(self.entries[1].get())
# 获得数据包的二进制值
pkg_raw = raw(icmp_packet)
# 构造数据包，自动计算校验和
icmp_packet = IP(pkg_raw)
# 去除数据包的IP首部，并构建ICMP对象，这样可以获得ICMP的校验和
pkg_icmp = pkg_raw[20:]
pkg_icmp = ICMP(pkg_icmp)
print("scapy自动计算的ICMP的校验和为：%04x" % pkg_icmp.chksum)
self.entries[1].delete(0, END)
self.entries[1].insert(0, hex(pkg_icmp.chksum))
self.entries[7].delete(0, END)
self.entries[7].insert(0, hex(icmp_packet.chksum))
icmp_packet.show()
self.resultText.insert('end', icmp_packet.summary() + '\n')
self.resultText.insert('end', str(icmp_packet) + '\n')
return Ether() / icmp_packet
except Exception as e:
print(e.with_traceback())
finally:
pass
#!/usr/bin/python3
from scapy.all import *
# Construct IP header
from scapy.layers.inet import IP
#src="l49.127.74.171",
ip = IP(src="49.127.74.171", dst="seanyiyi.com")
ip.id = 1000 # Identification
ip.frag = 0 # Offset of this IP fragment
ip.flags = 1 # Flags
# Construct UDP header
udp = UDP(sport=7070, dport=9090, chksum=0)
udp.len = 200 # This should be the combined length of all fragments
# Construct payload
payload = "A" * 72 # Put 80 bytes in the first fragment (72 byte from payload + 8byte udp header)
# Construct the entire packet and send it out
pkt = ip / udp / payload # For other fragments, we should use ip/payload
send(pkt, verbose=0)
pkt.show()
#----------------------second fragment---------------------
print(
"----------------------------------second fragment---------------------------------"
)
ip.proto = 17
payload2 = "B" * 80 # 80 / 8
ip.frag = 10
pkt2 = ip / payload2
send(pkt2, verbose=0)
pkt2.show()
def getIPPacket(self):
"""
构造IP数据包
:return:
"""
# chksum = self.entries[9].get()
try:
eth = Ether()
eth.src = self.entries[0].get()
eth.dst = self.entries[1].get()
eth.type = int(self.entries[2].get())
ip_packet = IP()
ip_packet.versionion = int(self.entries[3].get())
ip_packet.ihl = int(self.entries[4].get())
ip_packet.tos = int(self.entries[5].get())
ip_packet.len = int(self.entries[6].get())
ip_packet.id = int(self.entries[7].get())
ip_packet.flags = int(self.entries[8].get())
ip_packet.frag = int(self.entries[9].get())
ip_packet.ttl = int(self.entries[10].get())
ip_packet.proto = int(self.entries[11].get())
payload = self.entries[16].get()
ip_packet.src = self.entries[13].get()
ip_packet.dst = self.entries[14].get()
# 不含payload计算首部校验和
if payload == '':
print("无payload的IP报文")
ip_packet.show()
checksum_scapy = IP(raw(ip_packet)).chksum
# 自主计算验证IP首部检验和并进行填充
print("scapy自动计算的IP首部检验和是：%04x (%s)" %
(checksum_scapy, str(checksum_scapy)))
# 1.将IP首部和自动设置为0
ip_packet.chksum = 0
# 2.生成ip首部的数据字符串
x = raw(ip_packet)
ipString = "".join("%02x" % orb(x) for x in x)
# 3.将ip首部的数据字符串转换成字节数组
ipbytes = bytearray.fromhex(ipString)
# 4.调用校验和计算函数计算校验和
checksum_self = self.IP_headchecksum(ipbytes)
# 5.进行校验和验证
print("验证计算IP首部的检验和是：%04x (%s)" %
(checksum_self, str(checksum_self)))
# 含payload计算首部校验和
else:
print("含有payload的IP报文")
ip_packet = ip_packet / payload
ip_packet.show()
ip_packet.len = 20 + len(payload)
checksum_scapy = IP(raw(ip_packet)).chksum
print("scapy自动计算的IP首部检验和是：%04x (%s)" %
(checksum_scapy, str(checksum_scapy)))
ip_packet.chksum = 0
ip_packet.ihl = 5
print('\n 报文长度是：%s' % str(ip_packet.len))
x = raw(ip_packet)
ipString = "".join("%02x" % orb(x) for x in x)
ipbytes = bytearray.fromhex(ipString)
checksum_self = self.IP_headchecksum(ipbytes[0:ip_packet.ihl *
4])
print("验证计算IP首部的检验和是：%04x (%s)" %
(checksum_self, str(checksum_self)))
if checksum_self == checksum_scapy:
print("检验和正确")
else:
print("检验和不正确")
ip_packet.chksum = checksum_self
self.entries[12].delete(0, END)
self.entries[12].insert(0, hex(ip_packet.chksum))
ip_packet.show()
self.resultText.insert('end', ip_packet.summary() + '\n')
self.resultText.insert('end', str(ip_packet) + '\n')
return eth / ip_packet
except Exception as e:
print(e.with_traceback())
finally:
pass
