Not able to send packets in scapy on python3/Mac OS - python-3.x

Question

I am new to scapy and was trying to send an icmp packet using my wireless interface. I keep getting following error. I am using the latest scapy version on python3. When i try to send packet using python3 shell i keep getting segmentation fault 11 error. Both sr and send is failing.
bash-3.2$ ifconfig en1
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether 24:a0:74:ef:c2:0a
inet6 fe80::1421:2877:9b9f:8b7e%en1 prefixlen 64 secured scopeid 0x5
inet 192.168.0.56 netmask 0xffffff00 broadcast 192.168.0.255
nd6 options=201<PERFORMNUD,DAD>
media: autoselect
status: active
bash-3.2$ ping -S 192.168.0.56 www.google.com
PING www.google.com (172.217.166.68) from 192.168.0.56: 56 data bytes
64 bytes from 172.217.166.68: icmp_seq=0 ttl=55 time=26.458 ms
64 bytes from 172.217.166.68: icmp_seq=1 ttl=55 time=21.927 ms
bASH-3.2$ scapy
WARNING: Cannot read wireshark manuf database
WARNING: Crypto-related methods disabled for IPsec, Dot11 and TLS
layers (needs python-cryptography v1.7+).
WARNING: No route found for IPv6 destination :: (no default route?)
INFO: Can't import python-cryptography v1.7+. Disabled WEP
decryption/encryption.
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 2.4.0rc4
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 | To craft a packet, you have to be a
scccccp///pSP///p p//Y | packet, and learn how to swim in
sY/////////y caa S//P | the wires and in the waves.
cayCyayP//Ya pY/Ya | -- Jean-Claude Van Damme
sY/PsY////YCc aC//Yp |
sc sccaCY//PCypaapyCP//YSs
spCPY//////YPSps
ccaacs
>>> sr(IP(dst='www.google.com')/ICMP())
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Library/Python/2.7/site-packages/scapy-2.4.0rc4-
py2.7.egg/scapy/sendrecv.py", line 364, in sr
s = conf.L3socket(promisc=promisc, filter=filter, iface=iface,
nofilter=nofilter)
File "/Library/Python/2.7/site-packages/scapy-2.4.0rc4-
py2.7.egg/scapy/arch/bpf/supersocket.py", line 57, in __init__
(self.ins, self.dev_bpf) = get_dev_bpf()
File "/Library/Python/2.7/site-packages/scapy-2.4.0rc4-
py2.7.egg/scapy/arch/bpf/core.py", line 98, in get_dev_bpf
raise Scapy_Exception("No /dev/bpf handle is available !")
Scapy_Exception: No /dev/bpf handle is available

Answer 1

Try it with sudo scapy, it worked for me.
Here where I found the solution:
https://github.com/secdev/scapy/issues/1343
guedou commented on 8 Sep Scapy needs to be run as root to send
packets.

Answer 2

I ran into this same issue, but also for just sniffing packets (i.e., not to send, which I know needs root). So just starting scapy and running >>> sniff() would return Scapy_Exception: No /dev/bpf handle is available.
It turns out that by default the /dev/bpf* devices are owned by wheel, which my regular user is not part of. This is why sudo scapy works. The issue is that running under sudo is not always convenient.
I don't know if the /dev/bpf* devices be owned by any other group, but a quick workaround indicates that they can ...
Just install Wireshark! Once wireshark is installed, the /dev/bpf* devices are owned by access_bpf, a group that the non-root user is added into.

Answer 3

I got the same issue running with scapy as user with admin rights on Mac.
The solution is to run as super user - sudo
I tried it on both python 2.7.17 and 3.7.6.
Make sure you have the updated scapy package, see installation instruction on https://scapy.readthedocs.io/en/latest/installation.html
The root admin rights for scapy are listed in the following github issue doc https://github.com/secdev/scapy/issues/1851