def getTCPPacket(self):
"""
构造TCP数据包
:return:
"""
try:
ip_packet = IP()
ip_packet.version = int(self.entries[8].get())
ip_packet.ihl = int(self.entries[9].get())
ip_packet.tos = int(self.entries[10].get())
ip_packet.id = int(self.entries[11].get())
# ip_packet.flags = int(self.entries[12].get())
ip_packet.frag = int(self.entries[13].get())
ip_packet.ttl = int(self.entries[14].get())
# ip_packet.chksum = self.entries[15].get()
ip_packet.src = self.entries[16].get()
ip_packet.dst = self.entries[17].get()
tcp_packet = TCP()
tcp_packet.sport = int(self.entries[0].get())
tcp_packet.dport = int(self.entries[1].get())
tcp_packet.seq = int(self.entries[2].get())
tcp_packet.ack = int(self.entries[3].get())
tcp_packet.dataofs = int(self.entries[4].get())
tcp_packet.flags = int(self.entries[5].get())
tcp_packet.window = int(self.entries[6].get())
# tcp_packet.chksum = self.entries[7].get()
# scapy自动计算IP、TCP校验和
# 获得数据包的二进制值
pkg_raw = raw(ip_packet / tcp_packet)
tcp_packet_raw = pkg_raw[20:]
# 构造数据包，自动计算校验和
scapy_chksum_IP = IP(pkg_raw).chksum
scapy_chksum_tcp = TCP(tcp_packet_raw).chksum
print("scapy自动计算的TCP校验和为：%04x" % scapy_chksum_tcp)
# 手动计算TCP校验和
tcp_packet.chksum = 0
packet = ip_packet / tcp_packet
tcp_raw = raw(packet)[20:]
self_chksum = in4_chksum(socket.IPPROTO_TCP, packet[IP], tcp_raw)
print("手动计算的TCP校验和为：%04x" % self_chksum)
if self_chksum == scapy_chksum_tcp:
print("TCP验证和正确")
else:
print("TCP验证和不正确")
tcp_packet.chksum = scapy_chksum_tcp
self.entries[7].delete(0, END)
self.entries[7].insert(0, hex(scapy_chksum_tcp))
self.entries[15].delete(0, END)
self.entries[15].insert(0, hex(scapy_chksum_IP))
tcp_packet.show()
self.resultText.insert('end', tcp_packet.summary() + '\n')
self.resultText.insert('end', str(tcp_packet) + '\n')
return Ether() / ip_packet / tcp_packet
except Exception as e:
print(e.with_traceback())
finally:
pass
def getUDPPacket(self):
"""
构造UDP数据包
:param self:
:return:
"""
try:
ip_packet = IP()
ip_packet.version = int(self.entries[3].get())
ip_packet.ihl = int(self.entries[4].get())
ip_packet.tos = int(self.entries[5].get())
ip_packet.id = int(self.entries[6].get())
# ip_packet.flags = int(self.entries[7].get())
ip_packet.frag = int(self.entries[8].get())
ip_packet.ttl = int(self.entries[9].get())
# ip_packet.chksum = self.entries[10].get()
ip_packet.src = self.entries[11].get()
ip_packet.dst = self.entries[12].get()
udp_packet = UDP()
udp_packet.sport = int(self.entries[0].get())
udp_packet.dport = int(self.entries[1].get())
# udp_packet.chksum = int(self.entries[2].get())
# scapy自动计算IP、UDP校验和
# 获得数据包的二进制值
pkg_raw = raw(ip_packet / udp_packet)
udp_packet_raw = pkg_raw[20:]
# 构造数据包，自动计算校验和
scapy_chksum_IP = IP(pkg_raw).chksum
scapy_chksum_udp = UDP(udp_packet_raw).chksum
print("scapy自动计算的UDP校验和为：%04x" % scapy_chksum_udp)
# 手动计算UDP校验和
udp_packet.chksum = 0
packet = ip_packet / udp_packet
udp_raw = raw(packet)[20:]
self_chksum = in4_chksum(socket.IPPROTO_UDP, packet[IP], udp_raw)
print("手动计算的UDP校验和为：%04x" % self_chksum)
if self_chksum == scapy_chksum_udp:
print("UDP验证和正确")
else:
print("UDP验证和不正确")
udp_packet.chksum = scapy_chksum_udp
self.entries[2].delete(0, END)
self.entries[2].insert(0, hex(scapy_chksum_udp))
self.entries[10].delete(0, END)
self.entries[10].insert(0, hex(scapy_chksum_IP))
udp_packet.show()
self.resultText.insert('end', udp_packet.summary() + '\n')
self.resultText.insert('end', str(udp_packet) + '\n')
return Ether() / ip_packet / udp_packet
except Exception as e:
print(e.with_traceback())
finally:
pass
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
