「Python」IPデータベースを読む

2014年7月12日

Pythonコード：

#!/usr/bin/python

from struct import *
import string

def ip2string( ip ):
a = (ip & 0xff000000) >> 24
b = (ip & 0x00ff0000) >> 16
c = (ip & 0x0000ff00) >> 8
d = ip & 0x000000ff
return “%d.%d.%d.%d" % (a,b,c,d)

def string2ip( str ):
ss = string.split(str, '.’);
ip = 0L
for s in ss: ip = (ip << 8) + string.atoi(s)
return ip;

class IpLocater :
def __init__( self, ipdb_file ):
self.ipdb = open( ipdb_file, “rb" )
# get index address
str = self.ipdb.read( 8 )
(self.first_index,self.last_index) = unpack('II’,str)
self.index_count = (self.last_index – self.first_index) / 7 + 1

def getString(self,offset = 0):
if offset :
self.ipdb.seek( offset )
str = “"
ch = self.ipdb.read( 1 )
(byte,) = unpack('B’,ch)
while byte != 0:
str = str + ch
ch = self.ipdb.read( 1 )
(byte,) = unpack('B’,ch)
return str

def getLong3(self,offset = 0):
if offset :
self.ipdb.seek( offset )
str = self.ipdb.read(3)
(a,b) = unpack('HB’,str)
return (b << 16) + a

def getAreaAddr(self,offset=0):
if offset :
self.ipdb.seek( offset )
str = self.ipdb.read( 1 )
(byte,) = unpack('B’,str)
if byte == 0x01 or byte == 0x02:
p = self.getLong3()
if p:
return self.getString( p )
else:
return “"
else:
return self.getString( offset )

def getAddr(self,offset ,ip = 0):
self.ipdb.seek( offset + 4)

countryAddr = “"
areaAddr = “"
str = self.ipdb.read( 1 )
(byte,) = unpack('B’,str)
if byte == 0x01:
countryOffset = self.getLong3()
self.ipdb.seek(countryOffset )
str = self.ipdb.read( 1 )
(b,) = unpack('B’,str)
if b == 0x02:
countryAddr = self.getString( self.getLong3() )
self.ipdb.seek( countryOffset + 4 )
else:
countryAddr = self.getString( countryOffset )
areaAddr = self.getAreaAddr()
elif byte == 0x02:
countryAddr = self.getString( self.getLong3() )
areaAddr = self.getAreaAddr( offset + 8 )
else:
countryAddr = self.getString( offset + 4 )
areaAddr = self.getAreaAddr( )

return countryAddr + “/" + areaAddr

def output(self, first ,last ):
if last > self.index_count :
last = self.index_count
for index in range(first,last):
offset = self.first_index + index * 7
self.ipdb.seek( offset )
buf = self.ipdb.read( 7 )
(ip,of1,of2) = unpack(“IHB",buf)
print “%s – %s" % (ip, self.getAddr( of1 + (of2 << 16) ) )

def find(self,ip,left,right):
if right-left == 1:
return left
else:
middle = ( left + right ) / 2
offset = self.first_index + middle * 7
self.ipdb.seek( offset )
buf = self.ipdb.read( 4 )
(new_ip,) = unpack(“I",buf)
if ip <= new_ip :
return self.find( ip, left, middle )
else:
return self.find( ip, middle, right )

def getIpAddr(self,ip):
index = self.find( ip,0,self.index_count – 1 )
ioffset = self.first_index + index * 7
aoffset = self.getLong3( ioffset + 4)
address = self.getAddr( aoffset )
return address

if __name__ == “__main__" :
ip_locater = IpLocater( “XXXX" )
ip_locater.output( 100, 120 )
ip = '59.64.XXX.XXX’
ip = '58.38.XX1.XX2’
address = ip_locater.getIpAddr( string2ip( ip ) )
print “the ip %s come from %s" % (ip,address)