hello all ...
im trying to write a port scanner using scapy module
my code :

from scapy.all import * target = "192.168.1.81" print("Scanning .... " + target + " For Open Ports!\n") for x in range(20 , 100): packet = IP(dst=target)/TCP(dport=x,flags='S') res = sr1(packet ,timeout=0.5) if res.haslayer(TCP) and res.getlayer(TCP).flags==0x12: print("port" + str(x) + "is open!") sr(IP(dst=target)/TCP(dport=res.sport,flags='R'),timeout=0.5) print("scan is complete")

Output:
Scanning .... 192.168.1.81 For Open Ports! Begin emission: Finished sending 1 packets. ..... Received 5 packets, got 0 answers, remaining 1 packets Traceback (most recent call last): File "/home/evilcode1/Downloads/Course/ping.py", line 11, in <module> if res.haslayer(TCP) and res.getlayer(TCP).flags==0x12: AttributeError: 'NoneType' object has no attribute 'haslayer'

any help please

res doesn't have a .haslayer method, because res is None. So check to make sure it has a value before trying to use it:

 res = sr1(packet ,timeout=0.5) if res and res.haslayer(TCP) and res.getlayer(TCP).flags==0x12:

(Jan-27-2021, 05:19 PM)nilamo Wrote: res doesn't have a .haslayer method, because res is None. So check to make sure it has a value before trying to use it:

 res = sr1(packet ,timeout=0.5) if res and res.haslayer(TCP) and res.getlayer(TCP).flags==0x12:

thank u its work bro :D
but how i can hide this lines from scapy outputs ?

Output:
Received 1 packets, got 1 answers, remaining 0 packets Port : 21 is open! Begin emission: Finished sending 1 packets. ...... Received 6 packets, got 0 answers, remaining 1 packets Begin emission: Finished sending 1 packets. * Received 1 packets, got 1 answers, remaining 0 packets Port : 22 is open! Begin emission: Finished sending 1 packets.

i need it just to show :

Output:
Port : 22 is open! Port : 21 is open!

https://scapy.readthedocs.io/en/latest/a...ndrecv.sr1

Use the verbose option.

res = sr1(packet ,timeout=0.5, verbose=False)

our generic except masks any errors that your code might encounter. Change pass to raise and remove any specific errors. E.g. the first I encountered with your code was:

socket.error: [Errno 1] Operation not permitted

and after running as root I got:

A

ttributeError: 'list' object has no attribute 'haslayer'

and that made me change the code to something that worked (running as root):

from scapy.all import * while 1: pktl = sniff ( iface="eth0" , count = 1 ) pktl.summary() for pkt in pktl: try: if pkt.haslayer(IP): ipsrc =pkt.getlayer(IP).src print ipsrc except: raise

So you probably better of removing the try - except altogether

(Jan-27-2021, 05:54 PM)nilamo Wrote: https://scapy.readthedocs.io/en/latest/a...ndrecv.sr1

Use the verbose option.

res = sr1(packet ,timeout=0.5, verbose=False)

thank u solved my problem <3