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

[tmp%bh0.amt.ru@localhost]

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