I was going through a python scrip woof (
http://www.home.unix-ag.org/simon/woof ) and there was a portion of the code
dedicated to get IP address
def find_ip ():
if sys.platform == "cygwin":
ipcfg = os.popen("ipconfig").readlines()
for l in ipcfg:
try:
candidat = l.split(":")[1].strip()
if candidat[0].isdigit():
break
except:
pass
return candidat
os.environ["PATH"] = "/sbin:/usr/sbin:/usr/local/sbin:" + os.environ["PATH"]
platform = os.uname()[0];
if platform == "Linux":
netstat = commands.getoutput ("LC_MESSAGES=C netstat -rn")
defiface = [i.split ()[-1] for i in netstat.split ('\n')
if i.split ()[0] == "0.0.0.0"]
elif platform in ("Darwin", "FreeBSD", "NetBSD"):
netstat = commands.getoutput ("LC_MESSAGES=C netstat -rn")
defiface = [i.split ()[-1] for i in netstat.split ('\n')
if len(i) > 2 and i.split ()[0] ==
"default"]
elif platform == "SunOS":
netstat = commands.getoutput ("LC_MESSAGES=C netstat -arn")
defiface = [i.split ()[-1] for i in netstat.split ('\n')
if len(i) > 2 and i.split ()[0] ==
"0.0.0.0"]
else:
print >>sys.stderr, "Unsupported platform; please add support
for your platform in find_ip().";
return None
if not defiface:
return None
if platform == "Linux":
ifcfg = commands.getoutput ("LC_MESSAGES=C ifconfig "
+ defiface[0]).split ("inet addr:")
elif platform in ("Darwin", "FreeBSD", "SunOS", "NetBSD"):
ifcfg = commands.getoutput ("LC_MESSAGES=C ifconfig "
+ defiface[0]).split ("inet ")
if len (ifcfg) != 2:
return None
ip_addr = ifcfg[1].split ()[0]
# sanity check
try:
ints = [ i for i in ip_addr.split (".") if 0 <= int(i) <= 255]
if len (ints) != 4:
return None
except ValueError:
return None
return ip_addr
It gets OS name, run netstat -rn, gets the interface name via it ('en'
in my case i.e. Darwin, and then run ifconfig and split it via 'inet '
and gets the IP and do a check. Nice !!
However if I want to get my IP I can get it via:
>>>socket.gethostbyname(socket.gethostname())
I want to know why the above approach is followed, is it so because of
a check via network ?
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