scapy使用入门

启动

直接执行scapy启动交互式CLI界面。
在脚本中：from scapy.all import *

常用命令

• ls()
  常用的有ARP、Ether、ICMP、IP、UDP、TCP，也支持SNMP、DHCP、STP等。
• ls(IP)
  查看IP包结构
• lsc()
  查看支持的命令

构造报文

//类型+字段，缺省的不用设置
a=IP(dst="172.16.1.40")

查看报文内容

// 查看特定字段
>>> a.dst
'172.16.1.40'
 
//查看IP全部字段
>>> a.show()
###[ IP ]###
  version=4
  ihl= None
  tos=0x0
  len= None
  id=1
  flags=
  frag=0
  ttl=64
  proto= ip
  chksum= None
  src=10.1.159.51
  dst=172.16.1.40
  \options\
 
// 多层报文
>>> a= Ether(dst='001122334455')/IP(dst='2.2.2.2')/TCP(dport=23) 
>>> a.show()
###[ Ethernet ]###
  dst=001122334455
  src=00:1c:c4:aa:c9:36
  type=0x800
###[ IP ]###
     version=4
     ihl= None
     tos=0x0
     len= None
     id=1
     flags=
     frag=0
     ttl=64
     proto= tcp
     chksum= None
     src=10.1.159.51
     dst=2.2.2.2
     \options\
###[ TCP ]###
        sport= ftp_data
        dport= telnet
        seq=0
        ack=0
        dataofs= None
        reserved=0
        flags= S
        window=8192
        chksum= None
        urgptr=0
        options= {}

发送报文

>>> send(a,iface="eth1")
.
Sent 1 packets.

接收报文

>>> a=sniff(filter="icmp and host 10.1.159.71", count=2) 
>>> a.show()
0000 Ether / IP / ICMP 10.1.159.71 > 10.1.159.51 echo-request 0 / Raw
0001 Ether / IP / ICMP 10.1.159.51 > 10.1.159.71 echo-reply 0 / Raw
>>> a[1]
<Ether  dst=00:1f:29:63:41:62 src=00:1c:c4:aa:c9:36 type=0x800 |<IP  version=4L ihl=5L tos=0x0 len=84 id=523 flags= frag=0L ttl=64 proto=icmp chksum=0x2622 src=10.1.159.51 dst=10.1.159.71 options=[] |<ICMP  type=echo-reply code=0 chksum=0xf549 id=0x597b seq=0x1 |<Raw  load='\xdc\x1b\x82Q\x00\x00\x00\x00\x86\xf9\r\x00\x00\x00\x00\x00\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./01234567' |>>>>

发送和接收报文

// 发送ICMP请求，接收应答
>>> a = sr(IP(dst="10.1.159.71")/ICMP())
Begin emission:
....Finished to send 1 packets.
*
Received 5 packets, got 1 answers, remaining 0 packets
>>> a[0]
<Results: TCP:0 UDP:0 ICMP:1 Other:0>
>>> a[1]
<Unanswered: TCP:0 UDP:0 ICMP:0 Other:0>
>>> a[0].show()
0000 IP / ICMP 10.1.159.51 > 10.1.159.71 echo-request 0 ==> IP / ICMP 10.1.159.71 > 10.1.159.51 echo-reply 0 / Padding

读取cap内容

>>> d = rdpcap("./test.cap")                
>>> d
<test.cap: TCP:2 UDP:0 ICMP:0 Other:1>
>>> d.show()
0000 Ether / IP / TCP 10.1.159.51:ssh > 10.7.244.6:65464 PA / Raw
0001 Ether / IP / TCP 10.7.244.6:65464 > 10.1.159.51:ssh A / Padding
0002 802.3 00:25:83:b8:8f:83 > 01:00:0c:cc:cc:cd / LLC / SNAP / STP / Raw