Created
August 18, 2017 10:53
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Convert IP string to integer. Extract host_min, host_max from CIDR
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| import mysql.connector | |
| import sys, struct, socket | |
| def extract(cidr): | |
| (ip, cidr) = cidr.split('/') | |
| cidr = int(cidr) | |
| host_bits = 32 - cidr | |
| i = struct.unpack('>I', socket.inet_aton(ip))[0] | |
| host_min = (i >> host_bits) << host_bits | |
| host_max = i | ((1 << host_bits) - 1) | |
| return (format_ip(host_min), format_ip(host_max)) | |
| def format_ip_string(i): | |
| return socket.inet_ntoa(struct.pack('>I',i)) | |
| def string2int(s): | |
| return reduce(lambda a,b: a<<8 | b, map(int, s.split("."))) |
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