+
+ /*
+ * This case is the be all and end all patch to catch and nuke 4in6
+ * instead of special-casing shit all over the place and wreaking merry
+ * havoc with crap, instead, we just recreate sockaddr and strip ::ffff: prefix
+ * if it's a 4in6 IP.
+ *
+ * This is, of course, much improved over the older way of handling this
+ * (pretend it doesn't exist + hack around it -- yes, both were done!)
+ *
+ * Big, big thanks to danieldg for his work on this.
+ * -- w00t
+ */
+ static const unsigned char prefix4in6[12] = { 0,0,0,0, 0,0,0,0, 0,0,0xFF,0xFF };
+ if (!memcmp(prefix4in6, &((const sockaddr_in6*)client)->sin6_addr, 12))
+ {
+ // strip leading ::ffff: from the IPs
+ memmove(buf, buf+7, sizeof(buf)-7);
+ memmove(target, target+7, sizeof(target)-7);
+
+ // recreate as a sockaddr_in using the IPv4 IP
+ uint16_t sport = ((const sockaddr_in6*)client)->sin6_port;
+ struct sockaddr_in* clientv4 = (struct sockaddr_in*)client;
+ clientv4->sin_family = AF_INET;
+ clientv4->sin_port = sport;
+ inet_pton(AF_INET, buf, &clientv4->sin_addr);
+ }