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hash_ip.coffee
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hash_ip.coffee
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#!/usr/bin/env coffee
# Faked test stubs to simulate PAC running env
isInNet = (ipaddr, pattern, maskstr) ->
host = convert_addr(ipaddr)
pat = convert_addr(pattern)
mask = convert_addr(maskstr)
(host & mask) is (pat & mask)
myIpAddress = ->
"192.168.0.2"
HASH_BASE = 3
MASK_STEP = 2
min_prefixlen = 10
max_prefixlen = 24
### LOCAL_IP_BALANCE_BEGIN ###
local_ip_balance = (proxies) ->
myseg = parseInt(myIpAddress().split(".")[3])
l = proxies.length
k = myseg % l
s = ''
s += proxies[(k+i) % l] for i in [0...l]
s
### LOCAL_IP_BALANCE_END ###
### TARGET_HOST_BALANCE_BEGIN ###
target_host_balance = (proxies, host) ->
hash_string = (s) ->
hash = 0
for c in s
hash = (hash << 5) - hash + c.charCodeAt(0)
hash = hash & hash & 0xFFFF
hash &= 0xFFFF
hash
l = proxies.length
console.log hash_string(host)
k = hash_string(host) % l
s = ''
s += proxies[(k+i) % l] for i in [0...l]
s
### TARGET_HOST_BALANCE_END ###
### FLORA_BEGIN ###
convert_addr = (ipchars) ->
bytes = ipchars.split(".")
result = ((bytes[0] & 0xff) << 24) | ((bytes[1] & 0xff) << 16) \
| ((bytes[2] & 0xff) << 8) | (bytes[3] & 0xff)
result
dot2num = (dot) ->
d = dot.split(".")
# ((((((+d[0]) << 8) | (+d[1])) << 8) | (+d[2])) << 8) | (+d[3])
((((((+d[0])*256)+(+d[1]))*256)+(+d[2]))*256)+(+d[3])
num2dot = (ip) ->
[ip >>> 24, ip >>> 16 & 0xFF, ip >>> 8 & 0xFF, ip & 0xFF].join "."
hash_masked_ip = (ip, mask_len, mod_base) ->
offset = 32 - mask_len
net = ip >>> offset
net *= 2 for i in [0...offset]
# console.log net
# console.log mod_base
return net % mod_base
prefixlen2mask = (prefixlen) ->
imask = 0xFFFFFFFF << (32 - prefixlen)
(imask >> 24 & 0xFF) + '.' + (imask >> 16 & 0xFF) + '.' + \
(imask >> 8 & 0xFF) + '.' + (imask & 0xFF)
rebuild_net = (pair) ->
result = ['', '']
result[0] = num2dot pair[0] << (32 - pair[1])
result[1] = prefixlen2mask(pair[1])
return result
lookup_ip = (ip) ->
len = min_prefixlen
n_ip = dot2num(ip)
# console.log n_ip
while len <= max_prefixlen
# console.log len
k = hash_masked_ip(n_ip, len, HASH_BASE)
# console.log k
for i in hashed_nets[k]
n = rebuild_net i
return true if isInNet ip, n[0], n[1]
# console.log n
len += MASK_STEP
false
### FLORA_END ###
hashed_nets = [
[
[13248647, 24],
[828605, 20],
[13305856, 24],
],
[
[3313729, 22],
],
[
[173367, 20],
],
]
console.log dot2num("192.168.1.23")
console.log hash_masked_ip(dot2num("192.168.1.23"), 24, 1009)
console.log hash_masked_ip(dot2num("192.168.1.3"), 24, 1009)
for a in hashed_nets
console.log a
for i in a
console.log i
console.log rebuild_net(i)
console.log lookup_ip "202.65.4.0"
console.log lookup_ip "203.208.37.20"
console.log local_ip_balance ['S0', 'S1', 'S2']
console.log target_host_balance ['S0', 'S1', 'S2'], "google.com"