Arch: factor LOOPBACK_NAME const

This avoids a circular import problem affecting Windows platforms.

scapy/arch/__init__.py

@@ -10,7 +10,7 @@ Operating system specific functionality.
 import socket
 
 from scapy.arch.consts import LINUX, OPENBSD, FREEBSD, NETBSD, DARWIN, \
-    SOLARIS, WINDOWS, BSD, X86_64, ARM_64
+    SOLARIS, WINDOWS, BSD, X86_64, ARM_64, LOOPBACK_NAME
 from scapy.error import *
 import scapy.config
 from scapy.pton_ntop import inet_pton
@@ -73,7 +73,6 @@ if LINUX:
     if scapy.config.conf.use_pcap or scapy.config.conf.use_dnet:
         from scapy.arch.pcapdnet import *
 elif BSD:
-    from scapy.arch.bsd import LOOPBACK_NAME
     from scapy.arch.unix import read_routes, read_routes6, in6_getifaddr
     scapy.config.conf.use_pcap = True
     scapy.config.conf.use_dnet = True

scapy/arch/bsd.py

@@ -1,10 +0,0 @@
-## This file is part of Scapy
-## See http://www.secdev.org/projects/scapy for more informations
-## Copyright (C) Philippe Biondi <phil@secdev.org>
-## This program is published under a GPLv2 license
-
-"""
-Support for BSD-like operating systems such as FreeBSD, OpenBSD and Mac OS X.
-"""
-
-LOOPBACK_NAME = "lo0"

scapy/arch/consts.py

@@ -22,3 +22,5 @@ else:
     uname = os.uname()
     X86_64 = uname[4] == 'x86_64'
     ARM_64 = uname[4] == 'aarch64'
+
+LOOPBACK_NAME = "lo" if LINUX else "lo0"

scapy/arch/linux.py

@@ -12,6 +12,7 @@ import sys,os,struct,socket,time
 from select import select
 from fcntl import ioctl
 
+from scapy.arch.consts import LOOPBACK_NAME
 import scapy.utils
 import scapy.utils6
 from scapy.packet import Packet, Padding
@@ -81,8 +82,6 @@ PACKET_FASTROUTE = 6  # Fastrouted frame
 # Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space
 
 
-LOOPBACK_NAME="lo"
-
 with os.popen("%s -V 2> /dev/null" % conf.prog.tcpdump) as _f:
     if _f.close() >> 8 == 0x7f:
         log_loading.warning("Failed to execute tcpdump. Check it is installed and in the PATH")

scapy/arch/solaris.py

@@ -11,6 +11,4 @@ Customization for the Solaris operation system.
 import socket
 socket.IPPROTO_GRE = 47
 
-LOOPBACK_NAME="lo0"
-
 from scapy.arch.unix import *

scapy/arch/windows/__init__.py

@@ -13,6 +13,7 @@ import subprocess as sp
 from glob import glob
 import tempfile
 
+from scapy.arch.consts import LOOPBACK_NAME
 from scapy.config import conf,ConfClass
 from scapy.error import Scapy_Exception,log_loading,log_runtime
 from scapy.utils import atol, itom, inet_aton, inet_ntoa, PcapReader
@@ -38,7 +39,6 @@ if not hasattr(socket, 'IPPROTO_ESP'):
 from scapy.arch import pcapdnet
 from scapy.arch.pcapdnet import *
 
-LOOPBACK_NAME="lo0"
 WINDOWS = True
 
 def _exec_query_ps(cmd, fields):

scapy/route.py

@@ -8,7 +8,7 @@ Routing and handling of network interfaces.
 """
 
 import socket
-from scapy.arch import read_routes,get_if_addr,LOOPBACK_NAME
+from scapy.arch.consts import LOOPBACK_NAME
 from scapy.utils import atol,ltoa,itom
 from scapy.config import conf
 from scapy.error import Scapy_Exception,warning
@@ -26,6 +26,7 @@ class Route:
         self.cache = {}
 
     def resync(self):
+        from scapy.arch import read_routes
         self.invalidate_cache()
         self.routes = read_routes()
 
@@ -40,6 +41,7 @@ class Route:
         return rt
 
     def make_route(self, host=None, net=None, gw=None, dev=None):
+        from scapy.arch import get_if_addr
         if host is not None:
             thenet,msk = host,32
         elif net is not None: