deps: c-ares float, win ipv6 bad fec0 prefix

Was 72c5458: PR-URL: nodejs/node#5090 Reviewed-By: Fedor Indutny <[email protected]> Reimplemented for c-ares 1.13.0 PR-URL: nodejs/node#15378 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
addaleax · Oct 4, 2017 · 26a109a · 26a109a
1 parent fb8bcc3
commit 26a109a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/deps/cares/src/ares_init.c b/deps/cares/src/ares_init.c
@@ -1196,6 +1196,11 @@ static int get_DNS_AdaptersAddresses(char **outptr)
       }
       else if (namesrvr.sa->sa_family == AF_INET6)
       {
+        /* Windows apparently always reports some IPv6 DNS servers that
+         * prefixed with fec0:0:0:ffff. These ususally do not point to
+         * working DNS servers, so we ignore them. */
+        if (strncmp(addresses[addressesIndex].text, "fec0:0:0:ffff:", 14) == 0)
+          continue;
         if (memcmp(&namesrvr.sa6->sin6_addr, &ares_in6addr_any,
                    sizeof(namesrvr.sa6->sin6_addr)) == 0)
           continue;