Arch: move constant values to a new submodule

This avoids a circular import problem affecting Windows platforms.

scapy/arch/__init__.py

@@ -7,9 +7,10 @@
 Operating system specific functionality.
 """
 
+import socket
 
-import sys,os,socket
-
+from scapy.arch.consts import LINUX, OPENBSD, FREEBSD, NETBSD, DARWIN, \
+    SOLARIS, WINDOWS, BSD, X86_64, ARM_64
 from scapy.error import *
 import scapy.config
 from scapy.pton_ntop import inet_pton
@@ -54,19 +55,6 @@ def get_if_hwaddr(iff):
         raise Scapy_Exception("Unsupported address family (%i) for interface [%s]" % (addrfamily,iff))
 
 
-LINUX = sys.platform.startswith("linux")
-OPENBSD = sys.platform.startswith("openbsd")
-FREEBSD = "freebsd" in sys.platform
-NETBSD = sys.platform.startswith("netbsd")
-DARWIN = sys.platform.startswith("darwin")
-SOLARIS = sys.platform.startswith("sunos")
-WINDOWS = sys.platform.startswith("win32")
-BSD = DARWIN or FREEBSD or OPENBSD or NETBSD
-
-X86_64 = not WINDOWS and (os.uname()[4] == 'x86_64')
-ARM_64 = not WINDOWS and (os.uname()[4] == 'aarch64')
-
-
 # Next step is to import following architecture specific functions:
 # def get_if_raw_hwaddr(iff)
 # def get_if_raw_addr(iff):

scapy/arch/consts.py

+## 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
+
+import os
+from sys import platform
+
+LINUX = platform.startswith("linux")
+OPENBSD = platform.startswith("openbsd")
+FREEBSD = "freebsd" in platform
+NETBSD = platform.startswith("netbsd")
+DARWIN = platform.startswith("darwin")
+SOLARIS = platform.startswith("sunos")
+WINDOWS = platform.startswith("win32")
+BSD = DARWIN or FREEBSD or OPENBSD or NETBSD
+
+if WINDOWS:
+    X86_64 = False
+    ARM_64 = False
+else:
+    uname = os.uname()
+    X86_64 = uname[4] == 'x86_64'
+    ARM_64 = uname[4] == 'aarch64'

scapy/sendrecv.py

@@ -11,8 +11,8 @@ import errno
 import cPickle,os,sys,time,subprocess
 import itertools
 from select import select
+from scapy.arch.consts import DARWIN, FREEBSD
 from scapy.data import *
-from scapy import arch
 from scapy.config import conf
 from scapy.packet import Gen
 from scapy.utils import warning,get_temp_file,PcapReader,wrpcap
@@ -127,7 +127,7 @@ def sndrcv(pks, pkt, timeout = None, inter = 0, verbose=None, chainCC=0, retry=0
                                 if remaintime <= 0:
                                     break
                             r = None
-                            if not isinstance(pks, StreamSocket) and (arch.FREEBSD or arch.DARWIN):
+                            if not isinstance(pks, StreamSocket) and (FREEBSD or DARWIN):
                                 inp, out, err = select(inmask,[],[], 0.05)
                                 if len(inp) == 0 or pks in inp:
                                     r = pks.nonblock_recv()