Dump

.gitignore

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+# Output
+out.pac
+
+# Python
+__pycache__/
+
+# Other
+tmp*

build.sh

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+#!/bin/sh
+
+SOURCE="http://www.ipdeny.com/ipblocks/data/aggregated/cn-aggregated.zone"
+
+wget -O ip_ranges.txt "$SOURCE"
+cat >> ip_ranges.txt <<EOF
+10.0.0.0/8
+127.0.0.0/16
+129.254.0.0/16
+172.16.0.0/12
+192.168.0.0/16
+EOF
+python3 ranges_to_js.py > tmp.js
+cat code.js tmp.js > out.pac
+rm tmp.js

code.js

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+// Author: iBug
+
+function belongsToSubnet(host, list) {
+  var ip = host.split(".");
+  ip = 0x1000000 * Number(ip[0]) + 0x10000 * Number(ip[1]) +
+    0x100 * Number(ip[2]) + Number(ip[3]);
+
+  if (ip < list[0][0])
+    return false;
+
+  // Binary search
+  var x = 0, y = list.length, middle;
+  while (y - x > 1) {
+    middle = Math.floor((x + y) / 2);
+    if (list[middle][0] < ip)
+      x = middle;
+    else
+      y = middle;
+  }
+
+  // Match
+  var masked = ip & list[x][1];
+  return (masked >>> 0) == (list[x][0] >>> 0);
+}
+
+var proxy = "__PROXY__";
+var direct = "DIRECT";
+
+function FindProxyForURL(url, host) {
+  var remote = dnsResolve(host);
+  if (belongsToSubnet(remote, WHITELIST)) {
+      return direct;
+  }
+  return proxy;
+}
+
+// Format: [Hex IP, mask]
+// e.g. 1.0.1.0/24 = [0x80008000, 0xFFFFFF00]
+// Source: http://www.ipdeny.com/ipblocks/data/aggregated/cn-aggregated.zone
+

ranges_to_js.py

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+#!/usr/bin/python3
+
+def ip_to_num(s):
+    return sum([int(n) * (256 ** int(e)) for e, n in enumerate(s.split(".")[::-1])])
+
+def n_to_mask(n):
+    return (2**32 - 1) >> (32 - n) << (32 - n)
+
+def to_upper_hex(n):
+    return "{:#010X}".format(n).replace("X", "x")
+
+with open("ip_ranges.txt", "r") as f:
+    text = f.read()
+
+lines = [line for line in text.split("\n") if line]
+pairs = [p.split("/") for p in lines]
+data = [(ip_to_num(s), n_to_mask(int(n))) for s, n in pairs]
+data = sorted(data, key=lambda x: x[0])
+
+out = ",\n".join(["  [{}, {}]".format(to_upper_hex(a), to_upper_hex(b)) for a, b in data])
+out = "var WHITELIST = [\n" + out + "\n];"
+
+print(out)