Re: pkg/55446 (scapy function send() does not work)

[tmp%bh0.amt.ru@localhost]

The following reply was made to PR pkg/55446; it has been noted by GNATS.

From: tmp%bh0.amt.ru@localhost
To: gnats-bugs%netbsd.org@localhost, gutteridge%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        pkgsrc-bugs%netbsd.org@localhost, tmp%bh0.amt.ru@localhost
Cc: 
Subject: Re: pkg/55446 (scapy function send() does not work)
Date: Fri, 10 Jul 2020 23:43:56 +0300

 On 07/10/20 23:35, tmp%bh0.amt.ru@localhost wrote:
 > The following reply was made to PR pkg/55446; it has been noted by GNATS.
 >
 > From: tmp%bh0.amt.ru@localhost
 > To: gnats-bugs%netbsd.org@localhost, gutteridge%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
 >         pkgsrc-bugs%netbsd.org@localhost, tmp%bh0.amt.ru@localhost
 > Cc: 
 > Subject: Re: pkg/55446 (scapy function send() does not work)
 > Date: Fri, 10 Jul 2020 23:34:11 +0300
 >
 >  On 07/06/20 01:25, David H. Gutteridge wrote:
 >  > The following reply was made to PR pkg/55446; it has been noted by GNATS.
 >  >
 >  > From: "David H. Gutteridge" <david%gutteridge.ca@localhost>
 >  > To: gnats-bugs%netbsd.org@localhost
 >  > Cc: 
 >  > Subject: Re: pkg/55446 (scapy function send() does not work)
 >  > Date: Sun, 05 Jul 2020 18:24:07 -0400
 >  >
 >  >  I hadn't had occasion to try interacting with a loopback device with
 >  >  Scapy before, but I borrowed that example from the Scapy test suite
 >  >  (where it recorded a pass for me on NetBSD 8.1 when I ran it while
 >  >  doing the last package update), but, the difference is, their test
 >  >  example targets the IP address "8.8.8.8".
 >  
 >  I tried "8.8.8.8", the result was:
 >  
 >  # scapy 
 >  INFO: Can't import matplotlib. Won't be able to plot.
 >  INFO: Can't import PyX. Won't be able to use psdump() or pdfdump().
 >  INFO: No IPv6 support in kernel
 >  WARNING: No route found for IPv6 destination :: (no default route?)
 >  INFO: Can't import python-cryptography v1.7+. Disabled WEP decryption/encryption. (Dot11)
 >  INFO: Can't import python-cryptography v1.7+. Disabled IPsec encryption/authentication.
 >  WARNING: IPython not available. Using standard Python shell instead.
 >  AutoCompletion, History are disabled.
 >                                        
 >                       aSPY//YASa       
 >               apyyyyCY//////////YCa       |
 >              sY//////YSpcs  scpCY//Pp     | Welcome to Scapy
 >   ayp ayyyyyyySCP//Pp           syY//C    | Version git-archive.dev304758016
 >   AYAsAYYYYYYYY///Ps              cY//S   |
 >           pCCCCY//p          cSSps y//Y   | https://github.com/secdev/scapy
 >           SPPPP///a          pP///AC//Y   |
 >                A//A            cyP////C   | Have fun!
 >                p///Ac            sC///a   |
 >                P////YCpc           A//A   | Craft me if you can.
 >         scccccp///pSP///p          p//Y   |                   -- IPv6 layer
 >        sY/////////y  caa           S//P   |
 >         cayCyayP//Ya              pY/Ya
 >          sY/PsY////YCc          aC//Yp 
 >           sc  sccaCY//PCypaapyCP//YSs  
 >                    spCPY//////YPSps    
 >                         ccaacs         
 >                                        
 >  >>> sendp(IP(dst="8.8.8.8")/ICMP()/"test"
 >  ... help
 >    File "<console>", line 2
 >      help
 >         ^
 >  SyntaxError: invalid syntax
 >  >>> 
 
 I'm sorry for the mistake, the right output is:
 
 >>> send(IP(dst="8.8.8.8")/ICMP()/"test"
 ... help
   File "<console>", line 2
     help
        ^
 SyntaxError: invalid syntax
 >>> 
 
 
 >  I realized that something went wrong.
 >  
 >  > Anyway, you'll want to have a
 >  >  look at the following link in the Scapy documentation:
 >  >  
 >  >  https://scapy.readthedocs.io/en/latest/troubleshooting.html#i-can-t-ping-127-0-0-1-scapy-does-not-work-with-127-0-0-1-or-on-the-loopback-interface
 >  
 >  I tried the above, the result was:
 >  
 >  # scapy
 >  INFO: Can't import matplotlib. Won't be able to plot.
 >  INFO: Can't import PyX. Won't be able to use psdump() or pdfdump().
 >  INFO: No IPv6 support in kernel
 >  WARNING: No route found for IPv6 destination :: (no default route?)
 >  INFO: Can't import python-cryptography v1.7+. Disabled WEP decryption/encryption. (Dot11)
 >  INFO: Can't import python-cryptography v1.7+. Disabled IPsec encryption/authentication.
 >  WARNING: IPython not available. Using standard Python shell instead.
 >  AutoCompletion, History are disabled.
 >                                        
 >                       aSPY//YASa       
 >               apyyyyCY//////////YCa       |
 >              sY//////YSpcs  scpCY//Pp     | Welcome to Scapy
 >   ayp ayyyyyyySCP//Pp           syY//C    | Version git-archive.dev304758016
 >   AYAsAYYYYYYYY///Ps              cY//S   |
 >           pCCCCY//p          cSSps y//Y   | https://github.com/secdev/scapy
 >           SPPPP///a          pP///AC//Y   |
 >                A//A            cyP////C   | Have fun!
 >                p///Ac            sC///a   |
 >                P////YCpc           A//A   | Wanna support scapy? Rate it on
 >         scccccp///pSP///p          p//Y   | sectools!
 >        sY/////////y  caa           S//P   | http://sectools.org/tool/scapy/
 >         cayCyayP//Ya              pY/Ya   |             -- Satoshi Nakamoto
 >          sY/PsY////YCc          aC//Yp    |
 >           sc  sccaCY//PCypaapyCP//YSs  
 >                    spCPY//////YPSps    
 >                         ccaacs         
 >                                        
 >  >>> conf.L3socket
 >  <L3bpfSocket: read/write packets using BPF>
 >  >>> conf.L3socket=L3RawSocket
 >  >>> conf.L3socket
 >  <L3RawSocket: Layer 3 using Raw sockets (PF_INET/SOCK_RAW)>
 >  >>> p=IP(dst="127.0.0.1")/ICMP()/"test"
 >  >>> p.show2()
 >  ###[ IP ]### 
 >    version= 4
 >    ihl= 5
 >    tos= 0x0
 >    len= 32
 >    id= 1
 >    flags= 
 >    frag= 0
 >    ttl= 64
 >    proto= icmp
 >    chksum= 0x7cda
 >    src= 127.0.0.1
 >    dst= 127.0.0.1
 >    \options\
 >  ###[ ICMP ]### 
 >       type= echo-request
 >       code= 0
 >       chksum= 0x1026
 >       id= 0x0
 >       seq= 0x0
 >  ###[ Raw ]### 
 >          load= 'test'
 >  
 >  >>> send(p)
 >  Traceback (most recent call last):
 >    File "<console>", line 1, in <module>
 >    File "/usr/pkg/lib/python3.7/site-packages/scapy/sendrecv.py", line 316, in send
 >      socket = socket or conf.L3socket(*args, **kargs)
 >    File "/usr/pkg/lib/python3.7/site-packages/scapy/supersocket.py", line 150, in __init__
 >      self.ins = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(type))  # noqa: E501
 >  AttributeError: module 'socket' has no attribute 'AF_PACKET'
 >  
 >  >  Separately...
 >  >  
 >  >  >I'd like to clarify the environment of the bug:
 >  >  >(1) I have no active Ethernet or SLIP interfaces;
 >  >  >(2) I have active Wi-Fi and tun interfaces.
 >  >  >
 >  >  >According to the "man 4 bpf": "A packet can be sent out on the network
 >  >  >by writing to a bpf file descriptor. The writes are unbuffered, meaning
 >  >  >only one packet can be processed per write. Currently, only writes to
 >  >  >Ethernets and SLIP links are supported."
 >  >  
 >  >  I think there may be a documentation issue or two there. That last
 >  >  statement is perhaps outdated (I haven't checked in detail), and refers
 >  >  to writes to a link layer which Wi-Fi devices also use. (Note your
 >  >  tcpdump output states your iwi0 device's "link-type" is "Ethernet".)
 >  >  
 >  >  From looking at Scapy commits, it seems NetBSD 8 was the release they
 >  >  developed against. So generally we should expect at minimum it's more
 >  >  likely to work on 8.x than newer releases.
 >  >  
 >  >  I don't use Scapy much; I was using bits of it before for specific
 >  >  purposes, but not most of its functionality, so issues with it haven't
 >  >  been a priority for me to chase. I think in this case some of this
 >  >  issue is better directed to the Scapy project. (I will look into the
 >  >  bpf documentation aspect.)
 >  >  
 >  >  Dave
 >  
 >  OK. I'll write to the Scapy project.
 >  
 >  
 >  --
 >  Alexei