From 8ac673d36efa8a2b9882e8d23c620c8dbf440456 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Mon, 19 Dec 2016 03:17:26 -0800
Subject: [PATCH] ip: less strict parsing.

---
 lib/utils/ip.js | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/lib/utils/ip.js b/lib/utils/ip.js
index a4007c44..d53a879f 100644
--- a/lib/utils/ip.js
+++ b/lib/utils/ip.js
@@ -224,36 +224,24 @@ IP.parseV6 = function parseV6(str, buf, offset) {
   var parts = str.split(':');
   var missing = 8 - parts.length;
   var start = offset;
-  var len = parts.length;
-  var i = 0;
-  var word;
+  var colon = false;
+  var i, word;
 
   assert(missing >= 0, 'IPv6 address is too long.');
   assert(parts.length >= 2, 'Not an IPv6 address.');
 
-  if (parts[0].length === 0) {
-    assert(parts[1].length === 0,
-      'Empty leading colon in IPv6 address.');
-    missing += 1;
-    i++;
-  } else if (parts[len - 1].length === 0) {
-    assert(parts[len - 2].length === 0,
-      'Empty trailing colon in IPv6 address.');
-    missing += 1;
-    len--;
-  }
-
-  for (; i < len; i++) {
+  for (i = 0; i < parts.length; i++) {
     word = parts[i];
 
     if (word.length === 0) {
-      assert(missing > 0, 'Overuse of double colon in IPv6 address.');
+      assert(!colon, 'Overuse of double colon in IPv6 address.');
 
+      colon = true;
       missing += 1;
 
       // Eat extra colons.
       // e.g. :::0
-      while (i + 1 < len) {
+      while (i + 1 < parts.length) {
         word = parts[i + 1];
         if (word.length !== 0)
           break;