deps: reapply c-ares floating patch

bnoordhuis · rvagg · commit a54a446c31cb · 2016-02-09T15:47:08.000+11:00
PR-URL: #5090 Reviewed-By: Fedor Indutny <fedor@indutny.com>
diff --git a/deps/cares/src/ares_init.c b/deps/cares/src/ares_init.c
@@ -1025,6 +1025,11 @@ 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(txtaddr, "fec0:0:0:ffff:", 14) == 0)
+          continue;
         if (memcmp(&namesrvr.sa6->sin6_addr, &ares_in6addr_any,
                    sizeof(namesrvr.sa6->sin6_addr)) == 0)
           continue;

Original file line number	Diff line number	Diff line change
`@@ -1025,6 +1025,11 @@ static int get_DNS_AdaptersAddresses(char **outptr)`
`1025`	`1025`	`}`
`1026`	`1026`	`else if (namesrvr.sa->sa_family == AF_INET6)`
`1027`	`1027`	`{`
	`1028`	`+ /* Windows apparently always reports some IPv6 DNS servers that`
	`1029`	`+ * prefixed with fec0:0:0:ffff. These ususally do not point to`
	`1030`	`+ * working DNS servers, so we ignore them. */`
	`1031`	`+ if (strncmp(txtaddr, "fec0:0:0:ffff:", 14) == 0)`
	`1032`	`+ continue;`
`1028`	`1033`	`if (memcmp(&namesrvr.sa6->sin6_addr, &ares_in6addr_any,`
`1029`	`1034`	`sizeof(namesrvr.sa6->sin6_addr)) == 0)`
`1030`	`1035`	`continue;`