Main: Eliminate TOX_ENABLE_IPV6 (then always on), CLIENT_ONETOONE_IP (then always off).

Additionally (besides cleanups):

network.h/tox.h:
- WIN32: fix a strange sa_family_t definition
- WIN32: define EWOULDBLOCK to WSAEWOULDBLOCK
- WIN32: kill macro for an existing function (IN6_ADDR_EQUAL)

network.c:
- use EWOULDBLOCK instead of EAGAIN (same value, but EWOULDBLOCK is more "popular")
- new_networking(): only try to enable IPv4-in-IPv6 if it's not already enabled per default
- inet_ntop()/inet_pton(): WIN32: remove partial initializers in favor of a simple memset()
- ip_equal(): WIN32: use an existing function
- logging: networking_wait_execute(): only dump result if not timeout
- logging: loglogdata(): kill an unused variable

LAN_discovery.c:
- send_broadcasts(): re-enabled, can only support IPv4 by principle, split into fetch_broadcast_info() (to fetch the addresses once) and send_broadcasts() (actual sending)

DHT.c:
- DHT_load_state_callback(): enclosed a fprintf(stderr, ...) into #ifdef DEBUG

Lossless_UDP.c:
- change_handshake(): harden against strange sa_family_t definitions

Messenger.c:
- logging: fix ID to string conversion

util.c:
- logging: eliminate a signed-warning

10 files changed, 273 insertions, 644 deletions

diff --git a/toxcore/DHT.c b/toxcore/DHT.c
index 470826f0..ee51f16c 100644
--- a/toxcore/DHT.c
+++ b/toxcore/DHT.c
@@ -131,12 +131,9 @@ static int client_in_list(Client_data *list, uint32_t length, uint8_t *client_id
     uint64_t temp_time = unix_time();
 
     for (i = 0; i < length; i++)
-#ifdef CLIENT_ONETOONE_IP /* Dead nodes are considered dead (not in the list)*/
-        if (!is_timeout(temp_time, list[i].assoc.timestamp, KILL_NODE_TIMEOUT))
-#else
+        /* Dead nodes are considered dead (not in the list)*/
         if (!is_timeout(temp_time, list[i].assoc4.timestamp, KILL_NODE_TIMEOUT) ||
                 !is_timeout(temp_time, list[i].assoc6.timestamp, KILL_NODE_TIMEOUT))
-#endif
             if (id_equal(list[i].client_id, client_id))
                 return 1;
 
@@ -155,41 +152,12 @@ static int client_or_ip_port_in_list(Client_data *list, uint32_t length, uint8_t
     uint32_t i;
     uint64_t temp_time = unix_time();
 
-#ifdef CLIENT_ONETOONE_IP
-    uint8_t candropipv4 = 1;
-
-    if (ip_port.ip.family == AF_INET6) {
-        uint8_t ipv6cnt = 0;
-
-        /* ipv6: count how many spots are used */
-        for (i = 0; i < length; i++)
-            if (list[i].assoc.ip_port.ip.family == AF_INET6)
-                ipv6cnt++;
-
-        /* more than half the list filled with ipv6: block ipv4->ipv6 overwrite */
-        if (ipv6cnt > length / 2)
-            candropipv4 = 0;
-    }
-
-#endif
-
     /* if client_id is in list, find it and maybe overwrite ip_port */
     for (i = 0; i < length; ++i)
         if (id_equal(list[i].client_id, client_id)) {
             /* Refresh the client timestamp. */
-#ifdef CLIENT_ONETOONE_IP
-            /* if we got "too many" ipv6 addresses already, keep the ipv4 address */
-            if (!candropipv4 && (list[i].assoc.ip_port.ip.family == AF_INET))
-                return 1;
-
-            if (LAN_ip(list[i].assoc.ip_port.ip) != 0 && LAN_ip(ip_port.ip) == 0)
-                return 1;
-
-            list[i].assoc.ip_port = ip_port;
-            list[i].assoc.timestamp = temp_time;
-#else
-
             if (ip_port.ip.family == AF_INET) {
+
 #ifdef LOGGING
 
                 if (!ipport_equal(&list[i].assoc4.ip_port, &ip_port)) {
@@ -209,6 +177,7 @@ static int client_or_ip_port_in_list(Client_data *list, uint32_t length, uint8_t
                 list[i].assoc4.ip_port = ip_port;
                 list[i].assoc4.timestamp = temp_time;
             } else if (ip_port.ip.family == AF_INET6) {
+
 #ifdef LOGGING
 
                 if (!ipport_equal(&list[i].assoc6.ip_port, &ip_port)) {
@@ -229,7 +198,6 @@ static int client_or_ip_port_in_list(Client_data *list, uint32_t length, uint8_t
                 list[i].assoc6.timestamp = temp_time;
             }
 
-#endif
             return 1;
         }
 
@@ -238,21 +206,6 @@ static int client_or_ip_port_in_list(Client_data *list, uint32_t length, uint8_t
      * TODO: maybe we SHOULDN'T do that if that client_id is in a friend_list
      * and the one who is the actual friend's client_id/address set? */
     for (i = 0; i < length; ++i) {
-#ifdef CLIENT_ONETOONE_IP
-
-        if (ipport_equal(&list[i].assoc.ip_port, &ip_port)) {
-            /* Initialize client timestamp. */
-            list[i].assoc.timestamp = temp_time;
-            memcpy(list[i].client_id, client_id, CLIENT_ID_SIZE);
-#ifdef LOGGING
-            sprintf(logbuffer, "coipil[%u]: switching client_id\n", i);
-            loglog(logbuffer);
-#endif
-            return 1;
-        }
-
-#else
-
         /* MAYBE: check the other address, if valid, don't nuke? */
         if ((ip_port.ip.family == AF_INET) && ipport_equal(&list[i].assoc4.ip_port, &ip_port)) {
             /* Initialize client timestamp. */
@@ -277,8 +230,6 @@ static int client_or_ip_port_in_list(Client_data *list, uint32_t length, uint8_t
             memset(&list[i].assoc4, 0, sizeof(list[i].assoc4));
             return 1;
         }
-
-#endif
     }
 
     return 0;
@@ -338,22 +289,15 @@ static void get_close_nodes_inner(DHT *dht, uint8_t *client_id, Node_format *nod
             continue;
 
         IPPTsPng *ipptp = NULL;
-#ifdef CLIENT_ONETOONE_IP
-        ipptp = &client->assoc;
-#else
-
         if (sa_family == AF_INET)
             ipptp = &client->assoc4;
         else
             ipptp = &client->assoc6;
 
-#endif
-
         /* node not in a good condition? */
         if (is_timeout(timestamp, ipptp->timestamp, BAD_NODE_TIMEOUT))
             continue;
 
-#ifdef TOX_ENABLE_IPV6
         IP *client_ip = &ipptp->ip_port.ip;
 
         /*
@@ -373,9 +317,6 @@ static void get_close_nodes_inner(DHT *dht, uint8_t *client_id, Node_format *nod
         }
 
         ipv46x = !(sa_family == ip_treat_as_family);
-#else
-        ipv46x = !(sa_family == AF_INET);
-#endif
 
         /* node address of the wrong family? */
         if (ipv46x)
@@ -454,43 +395,17 @@ static int replace_bad(    Client_data    *list,
     uint32_t i;
     uint64_t temp_time = unix_time();
 
-#ifdef CLIENT_ONETOONE_IP
-    uint8_t candropipv4 = 1;
-
-    if (ip_port.ip.family == AF_INET6) {
-        uint32_t ipv6cnt = 0;
-
-        /* ipv6: count how many spots are used */
-        for (i = 0; i < length; i++)
-            if (list[i].assoc.ip_port.ip.family == AF_INET6)
-                ipv6cnt++;
-
-        /* more than half the list filled with ipv6: block ipv4->ipv6 overwrite */
-        if (ipv6cnt > length / 2)
-            candropipv4 = 0;
-    }
-
-#endif
-
     for (i = 0; i < length; ++i) {
         /* If node is bad */
         Client_data *client = &list[i];
         IPPTsPng *ipptp = NULL;
 
-#ifdef CLIENT_ONETOONE_IP
-        ipptp = &client->assoc;
-
-        if ((candropipv4 || (ipptp->ip_port.ip.family == AF_INET6)) &&
-                is_timeout(temp_time, ipptp->timestamp, BAD_NODE_TIMEOUT)) {
-#else
-
         if (ip_port.ip.family == AF_INET)
             ipptp = &client->assoc4;
         else
             ipptp = &client->assoc6;
 
         if (is_timeout(temp_time, ipptp->timestamp, BAD_NODE_TIMEOUT)) {
-#endif
             memcpy(client->client_id, client_id, CLIENT_ID_SIZE);
             ipptp->ip_port = ip_port;
             ipptp->timestamp = temp_time;
@@ -542,60 +457,17 @@ static int replace_good(   Client_data    *list,
 
     int8_t replace = -1;
 
-#ifdef CLIENT_ONETOONE_IP
-    uint8_t candropipv4 = 1;
-
-    if (ip_port.ip.family == AF_INET6) {
-        uint32_t i, ipv6cnt = 0;
-
-        /* ipv6: count how many spots are used */
-        for (i = 0; i < length; i++)
-            if (list[i].assoc.ip_port.ip.family == AF_INET6)
-                ipv6cnt++;
-
-        /* more than half the list filled with ipv6: block ipv4->ipv6 overwrite */
-        if (ipv6cnt > length / 2)
-            candropipv4 = 0;
-    }
-
-    uint32_t i;
-
-    if (candropipv4) {
-        /* either we got an ipv4 address, or we're "allowed" to push out an ipv4
-         * address in favor of an ipv6 one
-         *
-         * because the list is sorted, we can simply check the client_id at the
-         * border, either it is closer, then every other one is as well, or it is
-         * further, then it gets pushed out in favor of the new address, which
-         * will with the next sort() move to its "rightful" position
-         *
-         * CAVEAT: weirdly enough, the list is sorted DESCENDING in distance
-         * so the furthest element is the first, NOT the last (at least that's
-         * what the comment above sort_list() claims)
-         */
-#endif
-        if (id_closest(comp_client_id, list[0].client_id, client_id) == 2)
-            replace = 0;
-
-#ifdef CLIENT_ONETOONE_IP
-    } else {
-        /* ipv6 case without a right to push out an ipv4: only look for ipv6
-         * addresses, the first one we find is either closer (then we can skip
-         * out like above) or further (then we can replace it, like above)
-         */
-        for (i = 0; i < length; i++) {
-            Client_data *client = &list[i];
-
-            if (client->assoc.ip_port.ip.family == AF_INET6) {
-                if (id_closest(comp_client_id, list[i].client_id, client_id) == 2)
-                    replace = i;
-
-                break;
-            }
-        }
-    }
-
-#endif
+    /* Because the list is sorted, we can simply check the client_id at the
+     * border, either it is closer, then every other one is as well, or it is
+     * further, then it gets pushed out in favor of the new address, which
+     * will with the next sort() move to its "rightful" position
+     *
+     * CAVEAT: weirdly enough, the list is sorted DESCENDING in distance
+     * so the furthest element is the first, NOT the last (at least that's
+     * what the comment above sort_list() claims)
+     */
+    if (id_closest(comp_client_id, list[0].client_id, client_id) == 2)
+        replace = 0;
 
     if (replace != -1) {
 #ifdef DEBUG
@@ -603,16 +475,12 @@ static int replace_good(   Client_data    *list,
 #endif
         Client_data *client = &list[replace];
         IPPTsPng *ipptp = NULL;
-#ifdef CLIENT_ONETOONE_IP
-        ipptp = &client->assoc;
-#else
 
         if (ip_port.ip.family == AF_INET)
             ipptp = &client->assoc4;
         else
             ipptp = &client->assoc6;
 
-#endif
         memcpy(client->client_id, client_id, CLIENT_ID_SIZE);
         ipptp->ip_port = ip_port;
         ipptp->timestamp = unix_time();
@@ -681,11 +549,6 @@ static void returnedip_ports(DHT *dht, IP_Port ip_port, uint8_t *client_id, uint
     if (id_equal(client_id, dht->c->self_public_key)) {
         for (i = 0; i < LCLIENT_LIST; ++i) {
             if (id_equal(nodeclient_id, dht->close_clientlist[i].client_id)) {
-#ifdef CLIENT_ONETOONE_IP
-                dht->close_clientlist[i].assoc.ret_ip_port = ip_port;
-                dht->close_clientlist[i].assoc.ret_timestamp = temp_time;
-#else
-
                 if (ip_port.ip.family == AF_INET) {
                     dht->close_clientlist[i].assoc4.ret_ip_port = ip_port;
                     dht->close_clientlist[i].assoc4.ret_timestamp = temp_time;
@@ -694,7 +557,6 @@ static void returnedip_ports(DHT *dht, IP_Port ip_port, uint8_t *client_id, uint
                     dht->close_clientlist[i].assoc6.ret_timestamp = temp_time;
                 }
 
-#endif
                 return;
             }
         }
@@ -704,11 +566,6 @@ static void returnedip_ports(DHT *dht, IP_Port ip_port, uint8_t *client_id, uint
             if (id_equal(client_id, dht->friends_list[i].client_id)) {
                 for (j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
                     if (id_equal(nodeclient_id, dht->friends_list[i].client_list[j].client_id)) {
-#ifdef CLIENT_ONETOONE_IP
-                        dht->friends_list[i].client_list[j].assoc.ret_ip_port = ip_port;
-                        dht->friends_list[i].client_list[j].assoc.ret_timestamp = temp_time;
-#else
-
                         if (ip_port.ip.family == AF_INET) {
                             dht->friends_list[i].client_list[j].assoc4.ret_ip_port = ip_port;
                             dht->friends_list[i].client_list[j].assoc4.ret_timestamp = temp_time;
@@ -717,7 +574,6 @@ static void returnedip_ports(DHT *dht, IP_Port ip_port, uint8_t *client_id, uint
                             dht->friends_list[i].client_list[j].assoc6.ret_timestamp = temp_time;
                         }
 
-#endif
                         return;
                     }
                 }
@@ -836,7 +692,7 @@ static int sendnodes(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *cl
     new_nonce(nonce);
 
     memcpy(plain, &ping_id, sizeof(ping_id));
-#ifdef TOX_ENABLE_IPV6
+
     Node4_format *nodes4_list = (Node4_format *)(plain + sizeof(ping_id));
     int i, num_nodes_ok = 0;
 
@@ -862,10 +718,6 @@ static int sendnodes(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *cl
         num_nodes = num_nodes_ok;
     }
 
-#else
-    memcpy(plain + sizeof(ping_id), nodes_list, num_nodes * Node4_format_size);
-#endif
-
     int len = encrypt_data( public_key,
                             dht->c->self_secret_key,
                             nonce,
@@ -887,7 +739,6 @@ static int sendnodes(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *cl
     return sendpacket(dht->c->lossless_udp->net, ip_port, data, 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + len);
 }
 
-#ifdef TOX_ENABLE_IPV6
 /* Send a send nodes response: message for IPv6 nodes */
 static int sendnodes_ipv6(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *client_id, uint64_t ping_id)
 {
@@ -933,7 +784,6 @@ static int sendnodes_ipv6(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_
 
     return sendpacket(dht->c->lossless_udp->net, ip_port, data, 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + len);
 }
-#endif
 
 static int handle_getnodes(void *object, IP_Port source, uint8_t *packet, uint32_t length)
 {
@@ -962,10 +812,8 @@ static int handle_getnodes(void *object, IP_Port source, uint8_t *packet, uint32
 
     memcpy(&ping_id, plain, sizeof(ping_id));
     sendnodes(dht, source, packet + 1, plain + sizeof(ping_id), ping_id);
-#ifdef TOX_ENABLE_IPV6
     sendnodes_ipv6(dht, source, packet + 1, plain + sizeof(ping_id),
                    ping_id); /* TODO: prevent possible amplification attacks */
-#endif
 
     add_toping(dht->ping, packet + 1, source);
     //send_ping_request(dht, source, packet + 1); /* TODO: make this smarter? */
@@ -1005,14 +853,11 @@ static int handle_sendnodes(void *object, IP_Port source, uint8_t *packet, uint3
     if (!is_gettingnodes(dht, source, ping_id))
         return 1;
 
-    uint32_t i;
-    Node_format nodes_list[MAX_SENT_NODES];
-
-#ifdef TOX_ENABLE_IPV6
     Node4_format *nodes4_list = (Node4_format *)(plain + sizeof(ping_id));
+    Node_format nodes_list[MAX_SENT_NODES];
+    uint32_t i, num_nodes_ok = 0;
 
-    uint32_t num_nodes_ok = 0;
-
+    /* blow up from Node4 (IPv4) wire format to Node (IPv4/IPv6) structure */
     for (i = 0; i < num_nodes; i++)
         if ((nodes4_list[i].ip_port.ip.uint32 != 0) && (nodes4_list[i].ip_port.ip.uint32 != (uint32_t)~0)) {
             memcpy(nodes_list[num_nodes_ok].client_id, nodes4_list[i].client_id, CLIENT_ID_SIZE);
@@ -1028,10 +873,6 @@ static int handle_sendnodes(void *object, IP_Port source, uint8_t *packet, uint3
         num_nodes = num_nodes_ok;
     }
 
-#else
-    memcpy(nodes_list, plain + sizeof(ping_id), num_nodes * sizeof(Node_format));
-#endif
-
     addto_lists(dht, source, packet + 1);
 
     for (i = 0; i < num_nodes; ++i)  {
@@ -1042,7 +883,6 @@ static int handle_sendnodes(void *object, IP_Port source, uint8_t *packet, uint3
     return 0;
 }
 
-#ifdef TOX_ENABLE_IPV6
 static int handle_sendnodes_ipv6(void *object, IP_Port source, uint8_t *packet, uint32_t length)
 {
     DHT *dht = object;
@@ -1088,7 +928,6 @@ static int handle_sendnodes_ipv6(void *object, IP_Port source, uint8_t *packet,
 
     return 0;
 }
-#endif
 
 /*----------------------------------------------------------------------------------*/
 /*------------------------END of packet handling functions--------------------------*/
@@ -1103,21 +942,17 @@ static void get_bunchnodes(DHT *dht, Client_data *list, uint16_t length, uint16_
 
     for (i = 0; i < length; ++i) {
         IPPTsPng *assoc;
-#ifdef CLIENT_ONETOONE_IP
-        assoc = &list[i].assoc;
-#else
         uint32_t a;
 
         for (a = 0, assoc = &list[i].assoc6; a < 2; a++, assoc = &list[i].assoc4)
-#endif
-        if (ipport_isset(&(assoc->ip_port)) &&
-                !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
-            getnodes(dht, assoc->ip_port, list[i].client_id, client_id);
-            ++num;
+            if (ipport_isset(&(assoc->ip_port)) &&
+                    !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
+                getnodes(dht, assoc->ip_port, list[i].client_id, client_id);
+                ++num;
 
-            if (num >= max_num)
-                return;
-        }
+                if (num >= max_num)
+                    return;
+            }
     }
 }
 
@@ -1194,17 +1029,13 @@ int DHT_getfriendip(DHT *dht, uint8_t *client_id, IP_Port *ip_port)
 
                 if (id_equal(client->client_id, client_id)) {
                     IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-                    assoc = &client->assoc;
-#else
                     uint32_t a;
 
                     for (a = 0, assoc = &client->assoc6; a < 2; a++, assoc = &client->assoc4)
-#endif
-                    if (!is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT)) {
-                        *ip_port = assoc->ip_port;
-                        return 1;
-                    }
+                        if (!is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT)) {
+                            *ip_port = assoc->ip_port;
+                            return 1;
+                        }
                 }
             }
 
@@ -1229,27 +1060,22 @@ static void do_ping_and_sendnode_requests(DHT *dht, uint64_t *lastgetnode, uint8
         /* If node is not dead. */
         Client_data *client = &list[i];
         IPPTsPng *assoc;
-#ifdef CLIENT_ONETOONE_IP
-        assoc = &client->assoc;
-#else
         uint32_t a;
 
         for (a = 0, assoc = &client->assoc6; a < 2; a++, assoc = &client->assoc4)
-#endif
-
-        if (!is_timeout(temp_time, assoc->timestamp, KILL_NODE_TIMEOUT)) {
-            if (is_timeout(temp_time, assoc->last_pinged, PING_INTERVAL)) {
-                send_ping_request(dht->ping, assoc->ip_port, client->client_id );
-                assoc->last_pinged = temp_time;
-            }
+            if (!is_timeout(temp_time, assoc->timestamp, KILL_NODE_TIMEOUT)) {
+                if (is_timeout(temp_time, assoc->last_pinged, PING_INTERVAL)) {
+                    send_ping_request(dht->ping, assoc->ip_port, client->client_id );
+                    assoc->last_pinged = temp_time;
+                }
 
-            /* If node is good. */
-            if (!is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT)) {
-                client_list[num_nodes] = client;
-                assoc_list[num_nodes] = assoc;
-                ++num_nodes;
+                /* If node is good. */
+                if (!is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT)) {
+                    client_list[num_nodes] = client;
+                    assoc_list[num_nodes] = assoc;
+                    ++num_nodes;
+                }
             }
-        }
     }
 
     if ((num_nodes != 0) &&
@@ -1291,31 +1117,25 @@ int DHT_bootstrap_from_address(DHT *dht, const char *address, uint8_t ipv6enable
 {
     IP_Port ip_port_v64;
     IP *ip_extra = NULL;
-#ifdef TOX_ENABLE_IPV6
     IP_Port ip_port_v4;
     ip_init(&ip_port_v64.ip, ipv6enabled);
 
     if (ipv6enabled) {
+        /* setup for getting BOTH: an IPv6 AND an IPv4 address */
         ip_port_v64.ip.family = AF_UNSPEC;
         ip_reset(&ip_port_v4.ip);
         ip_extra = &ip_port_v4.ip;
     }
 
-#else
-    ip_init(&ip_port_v64.ip, 0);
-#endif
-
     if (addr_resolve_or_parse_ip(address, &ip_port_v64.ip, ip_extra)) {
         ip_port_v64.port = port;
         DHT_bootstrap(dht, ip_port_v64, public_key);
-#ifdef TOX_ENABLE_IPV6
 
         if ((ip_extra != NULL) && ip_isset(ip_extra)) {
             ip_port_v4.port = port;
             DHT_bootstrap(dht, ip_port_v4, public_key);
         }
 
-#endif
         return 1;
     } else
         return 0;
@@ -1332,12 +1152,6 @@ int route_packet(DHT *dht, uint8_t *client_id, uint8_t *packet, uint32_t length)
     for (i = 0; i < LCLIENT_LIST; ++i) {
         if (id_equal(client_id, dht->close_clientlist[i].client_id)) {
             Client_data *client = &dht->close_clientlist[i];
-#ifdef CLIENT_ONETOONE_IP
-
-            if (ip_isset(&client->assoc.ip_port.ip))
-                return sendpacket(dht->c->lossless_udp->net, dht->close_clientlist[i].assoc.ip_port, packet, length);
-
-#else
 
             if (ip_isset(&client->assoc6.ip_port.ip))
                 return sendpacket(dht->c->lossless_udp->net, client->assoc6.ip_port, packet, length);
@@ -1345,8 +1159,6 @@ int route_packet(DHT *dht, uint8_t *client_id, uint8_t *packet, uint32_t length)
                 return sendpacket(dht->c->lossless_udp->net, client->assoc4.ip_port, packet, length);
             else
                 break;
-
-#endif
         }
     }
 
@@ -1355,7 +1167,6 @@ int route_packet(DHT *dht, uint8_t *client_id, uint8_t *packet, uint32_t length)
 
 /* Puts all the different ips returned by the nodes for a friend_num into array ip_portlist.
  * ip_portlist must be at least MAX_FRIEND_CLIENTS big.
- * unless CLIENT_ONETOONE_IP is defined, returns an array with ips of the same family.
  *
  *  return the number of ips returned.
  *  return 0 if we are connected to friend or if no ips were found.
@@ -1375,55 +1186,56 @@ static int friend_iplist(DHT *dht, IP_Port *ip_portlist, uint16_t friend_num)
     int num_ipv4s = 0;
     IP_Port ipv6s[MAX_FRIEND_CLIENTS];
     int num_ipv6s = 0;
+    uint8_t connected;
 
     for (i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
         client = &(friend->client_list[i]);
-
-        IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-        assoc = &client->assoc;
-#else
-        assoc = &client->assoc4;
-#endif
-
-        if (id_equal(client->client_id, friend->client_id) &&
-                !is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT))
-            return 0;
+        connected = 0;
 
         /* If ip is not zero and node is good. */
-        if (ip_isset(&assoc->ret_ip_port.ip) && !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
-            ipv4s[num_ipv4s] = assoc->ret_ip_port;
+        if (ip_isset(&client->assoc4.ret_ip_port.ip) && !is_timeout(temp_time, client->assoc4.ret_timestamp, BAD_NODE_TIMEOUT)) {
+            ipv4s[num_ipv4s] = client->assoc4.ret_ip_port;
             ++num_ipv4s;
+
+            connected = 1;
         }
-    }
 
-#ifndef CLIENT_ONETOONE_IP
+        if (ip_isset(&client->assoc6.ret_ip_port.ip) && !is_timeout(temp_time, client->assoc6.ret_timestamp, BAD_NODE_TIMEOUT)) {
+            ipv6s[num_ipv6s] = client->assoc6.ret_ip_port;
+            ++num_ipv6s;
 
-    for (i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
-        client = &(friend->client_list[i]);
+            connected = 1;
+        }
 
-        IPPTsPng *assoc = NULL;
-        assoc = &client->assoc6;
+        if (connected && id_equal(client->client_id, friend->client_id))
+            return 0; /* direct connectivity */
+    }
 
-        if (id_equal(client->client_id, friend->client_id) &&
-                !is_timeout(temp_time, assoc->timestamp, BAD_NODE_TIMEOUT))
-            return 0;
+#ifdef FRIEND_IPLIST_PAD
+    memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
+    if (num_ipv6s == MAX_FRIEND_CLIENTS)
+        return MAX_FRIEND_CLIENTS;
 
-        /* If ip is not zero and node is good. */
-        if (ip_isset(&assoc->ret_ip_port.ip) && !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
-            ipv6s[num_ipv6s] = assoc->ret_ip_port;
-            ++num_ipv6s;
-        }
-    }
+    int num_ipv4s_used = MAX_FRIEND_CLIENTS - num_ipv6s;
+    if (num_ipv4s_used > num_ipv4s)
+        num_ipv4s_used = num_ipv4s;
+    memcpy(&ip_portlist[num_ipv6s], ipv4s, num_ipv4s_used * sizeof(IP_Port));
+    return num_ipv6s + num_ipv4s_used;
+
+#else /* !FRIEND_IPLIST_PAD */
 
+    /* there must be some secret reason why we can't pad the longer list
+     * with the shorter one...
+     */
     if (num_ipv6s >= num_ipv4s) {
         memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
         return num_ipv6s;
     }
 
-#endif
     memcpy(ip_portlist, ipv4s, num_ipv4s * sizeof(IP_Port));
     return num_ipv4s;
+
+#endif /* !FRIEND_IPLIST_PAD */
 }
 
 
@@ -1452,30 +1264,23 @@ int route_tofriend(DHT *dht, uint8_t *friend_id, uint8_t *packet, uint32_t lengt
     DHT_Friend *friend = &dht->friends_list[num];
     Client_data *client;
 
-#ifndef CLIENT_ONETOONE_IP
     /* extra legwork, because having the outside allocating the space for us
      * is *usually* good(tm) (bites us in the behind in this case though) */
     uint32_t a;
 
     for (a = 0; a < 2; a++)
-#endif
         for (i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
             if (friend_sent[i])/* Send one packet per client.*/
                 continue;
 
             client = &friend->client_list[i];
             IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-            assoc = &client->assoc;
-#else
 
             if (!a)
                 assoc = &client->assoc4;
             else
                 assoc = &client->assoc6;
 
-#endif
-
             /* If ip is not zero and node is good. */
             if (ip_isset(&assoc->ret_ip_port.ip) &&
                     !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
@@ -1510,27 +1315,20 @@ static int routeone_tofriend(DHT *dht, uint8_t *friend_id, uint8_t *packet, uint
     uint32_t i;
     uint64_t temp_time = unix_time();
 
-#ifndef CLIENT_ONETOONE_IP
     /* extra legwork, because having the outside allocating the space for us
      * is *usually* good(tm) (bites us in the behind in this case though) */
     uint32_t a;
 
     for (a = 0; a < 2; a++)
-#endif
         for (i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
             client = &friend->client_list[i];
             IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-            assoc = &client->assoc;
-#else
 
             if (!a)
                 assoc = &client->assoc4;
             else
                 assoc = &client->assoc6;
 
-#endif
-
             /* If ip is not zero and node is good. */
             if (ip_isset(&assoc->ret_ip_port.ip) && !is_timeout(temp_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
                 ip_list[n] = assoc->ip_port;
@@ -1776,9 +1574,7 @@ DHT *new_DHT(Net_Crypto *c)
     dht->c = c;
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_GET_NODES, &handle_getnodes, dht);
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES, &handle_sendnodes, dht);
-#ifdef TOX_ENABLE_IPV6
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES_IPV6, &handle_sendnodes_ipv6, dht);
-#endif
 
     init_cryptopackets(dht);
     cryptopacket_registerhandler(c, CRYPTO_PACKET_NAT_PING, &handle_NATping, dht);
@@ -1885,12 +1681,8 @@ uint32_t DHT_size(DHT *dht)
     uint32_t num = 0, i;
 
     for (i = 0; i < LCLIENT_LIST; ++i)
-#ifdef CLIENT_ONETOONE_IP
-        if (dht->close_clientlist[i].assoc.timestamp != 0)
-#else
         if ((dht->close_clientlist[i].assoc4.timestamp != 0) ||
                 (dht->close_clientlist[i].assoc6.timestamp != 0))
-#endif
             num++;
 
     uint32_t size32 = sizeof(uint32_t), sizesubhead = size32 * 2;
@@ -1917,11 +1709,7 @@ void DHT_save(DHT *dht, uint8_t *data)
     data += sizeof(uint32_t);
 
     len = sizeof(DHT_Friend) * dht->num_friends;
-#ifdef CLIENT_ONETOONE_IP
-    type = DHT_STATE_TYPE_FRIENDS;
-#else
     type = DHT_STATE_TYPE_FRIENDS_ASSOC46;
-#endif
     data = z_state_save_subheader(data, len, type);
     memcpy(data, dht->friends_list, len);
     data += len;
@@ -1929,32 +1717,20 @@ void DHT_save(DHT *dht, uint8_t *data)
     uint32_t num = 0, i;
 
     for (i = 0; i < LCLIENT_LIST; ++i)
-#ifdef CLIENT_ONETOONE_IP
-        if (dht->close_clientlist[i].assoc.timestamp != 0)
-#else
         if ((dht->close_clientlist[i].assoc4.timestamp != 0) ||
                 (dht->close_clientlist[i].assoc6.timestamp != 0))
-#endif
             num++;
 
     len = num * sizeof(Client_data);
-#ifdef CLIENT_ONETOONE_IP
-    type = DHT_STATE_TYPE_CLIENTS;
-#else
     type = DHT_STATE_TYPE_CLIENTS_ASSOC46;
-#endif
     data = z_state_save_subheader(data, len, type);
 
     if (num) {
         Client_data *clients = (Client_data *)data;
 
         for (num = 0, i = 0; i < LCLIENT_LIST; ++i)
-#ifdef CLIENT_ONETOONE_IP
-            if (dht->close_clientlist[i].assoc.timestamp != 0)
-#else
             if ((dht->close_clientlist[i].assoc4.timestamp != 0) ||
                     (dht->close_clientlist[i].assoc6.timestamp != 0))
-#endif
                 memcpy(&clients[num++], &dht->close_clientlist[i], sizeof(Client_data));
     }
 
@@ -2005,18 +1781,18 @@ static int dht_load_state_callback(void *outer, uint8_t *data, uint32_t length,
             break;
 
         case DHT_STATE_TYPE_FRIENDS_ASSOC46:
-            if (length % sizeof(DHT_Friend_new) != 0)
+            if (length % sizeof(DHT_Friend) != 0)
                 break;
 
             { /* localize declarations */
-                DHT_Friend_new *friend_list = (DHT_Friend_new *)data;
-                num = length / sizeof(DHT_Friend_new);
+                DHT_Friend *friend_list = (DHT_Friend *)data;
+                num = length / sizeof(DHT_Friend);
 
                 for (i = 0; i < num; ++i) {
                     DHT_addfriend(dht, friend_list[i].client_id);
 
                     for (j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
-                        Client_data_new *client = &friend_list[i].client_list[j];
+                        Client_data *client = &friend_list[i].client_list[j];
 
                         if (client->assoc4.timestamp != 0)
                             getnodes(dht, client->assoc4.ip_port, client->client_id, friend_list[i].client_id);
@@ -2030,12 +1806,12 @@ static int dht_load_state_callback(void *outer, uint8_t *data, uint32_t length,
             break;
 
         case DHT_STATE_TYPE_CLIENTS_ASSOC46:
-            if ((length % sizeof(Client_data_new)) != 0)
+            if ((length % sizeof(Client_data)) != 0)
                 break;
 
             { /* localize declarations */
-                num = length / sizeof(Client_data_new);
-                Client_data_new *client_list = (Client_data_new *)data;
+                num = length / sizeof(Client_data);
+                Client_data *client_list = (Client_data *)data;
 
                 for (i = 0; i < num; ++i) {
                     if (client_list[i].assoc4.timestamp != 0)
@@ -2048,9 +1824,12 @@ static int dht_load_state_callback(void *outer, uint8_t *data, uint32_t length,
 
             break;
 
+#ifdef DEBUG
         default:
             fprintf(stderr, "Load state (DHT): contains unrecognized part (len %u, type %u)\n",
                     length, type);
+            break;
+#endif
     }
 
     return 0;
@@ -2085,13 +1864,9 @@ int DHT_isconnected(DHT *dht)
 
     for (i = 0; i < LCLIENT_LIST; ++i) {
         Client_data *client = &dht->close_clientlist[i];
-#ifdef CLIENT_ONETOONE_IP
 
-        if (!is_timeout(temp_time, client->assoc.timestamp, BAD_NODE_TIMEOUT))
-#else
         if (!is_timeout(temp_time, client->assoc4.timestamp, BAD_NODE_TIMEOUT) ||
                 !is_timeout(temp_time, client->assoc6.timestamp, BAD_NODE_TIMEOUT))
-#endif
             return 1;
     }
 
diff --git a/toxcore/DHT.h b/toxcore/DHT.h
index 46193b56..360773ff 100644
--- a/toxcore/DHT.h
+++ b/toxcore/DHT.h
@@ -56,13 +56,13 @@ typedef struct {
 typedef struct {
     uint8_t     client_id[CLIENT_ID_SIZE];
     IPPTsPng    assoc;
-} Client_data_old;
+} Client_data_old; /* required to load old state files */
 
 typedef struct {
     uint8_t     client_id[CLIENT_ID_SIZE];
     IPPTsPng    assoc4;
     IPPTsPng    assoc6;
-} Client_data_new;
+} Client_data;
 
 /*----------------------------------------------------------------------------------*/
 
@@ -85,27 +85,18 @@ typedef struct {
 
     /* Symetric NAT hole punching stuff. */
     NAT         nat;
-} DHT_Friend_old;
+} DHT_Friend_old;  /* required to load old state files */
 
 typedef struct {
     uint8_t     client_id[CLIENT_ID_SIZE];
-    Client_data_new client_list[MAX_FRIEND_CLIENTS];
+    Client_data client_list[MAX_FRIEND_CLIENTS];
 
     /* Time at which the last get_nodes request was sent. */
     uint64_t    lastgetnode;
 
     /* Symetric NAT hole punching stuff. */
     NAT         nat;
-} DHT_Friend_new;
-
-/* #define CLIENT_ONETOONE_IP */
-#ifdef CLIENT_ONETOONE_IP
-typedef Client_data_old Client_data;
-typedef DHT_Friend_old DHT_Friend;
-#else
-typedef Client_data_new Client_data;
-typedef DHT_Friend_new DHT_Friend;
-#endif
+} DHT_Friend;
 
 /* this must be kept even if IP_Port is expanded: wire compatibility */
 typedef struct {
@@ -116,13 +107,7 @@ typedef struct {
 typedef struct {
     uint8_t     client_id[CLIENT_ID_SIZE];
     IP_Port     ip_port;
-} Node46_format;
-
-#ifdef TOX_ENABLE_IPV6
-typedef Node46_format Node_format;
-#else
-typedef Node4_format Node_format;
-#endif
+} Node_format;
 
 /*----------------------------------------------------------------------------------*/
 
diff --git a/toxcore/LAN_discovery.c b/toxcore/LAN_discovery.c
index 1e4fa125..26366d0f 100644
--- a/toxcore/LAN_discovery.c
+++ b/toxcore/LAN_discovery.c
@@ -30,60 +30,83 @@
 #define MAX_INTERFACES 16
 
 #ifdef __linux
-#ifndef TOX_ENABLE_IPV6
-/* Send packet to all broadcast addresses
- *
- *  return higher than 0 on success.
- *  return 0 on error.
- *
- * TODO: Make this work with IPv6 and remove the #ifndef TOX_ENABLE_IPV6.
- */
-static uint32_t send_broadcasts(Networking_Core *net, uint16_t port, uint8_t *data, uint16_t length)
+
+static int     broadcast_count = -1;
+static IP_Port broadcast_ip_port[MAX_INTERFACES];
+
+static void fetch_broadcast_info(uint16_t port)
 {
     /* Not sure how many platforms this will run on,
      * so it's wrapped in __linux for now.
+     * Definitely won't work like this on Windows...
      */
-    struct sockaddr_in *sock_holder = NULL;
-    struct ifreq i_faces[MAX_INTERFACES];
-    struct ifconf ifconf;
-    int count = 0;
-    int sock = 0;
-    int i = 0;
+    broadcast_count = 0;
+    sock_t sock = 0;
+    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+        return;
 
     /* Configure ifconf for the ioctl call. */
-    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
-        return 1;
-    }
-
+    struct ifreq i_faces[MAX_INTERFACES];
     memset(i_faces, 0, sizeof(struct ifreq) * MAX_INTERFACES);
 
+    struct ifconf ifconf;
     ifconf.ifc_buf = (char *)i_faces;
     ifconf.ifc_len = sizeof(i_faces);
-    count = ifconf.ifc_len / sizeof(struct ifreq);
 
     if (ioctl(sock, SIOCGIFCONF, &ifconf) < 0) {
-        return 1;
+        close(sock);
+        return;
     }
 
+    /* ifconf.ifc_len is set by the ioctl() to the actual length used;
+     * on usage of the complete array the call should be repeated with
+     * a larger array, not done (640kB and 16 interfaces shall be
+     * enough, for everybody!)
+     */
+    int i, count = ifconf.ifc_len / sizeof(struct ifreq);
     for (i = 0; i < count; i++) {
-        if (ioctl(sock, SIOCGIFBRDADDR, &i_faces[i]) < 0) {
-            return 1;
-        }
-
-        /* Just to clarify where we're getting the values from. */
-        sock_holder = (struct sockaddr_in *)&i_faces[i].ifr_broadaddr;
-
-        if (sock_holder != NULL) {
-            IP_Port ip_port = {{{{sock_holder->sin_addr.s_addr}}, port, 0}};
-            sendpacket(net, ip_port, data, 1 + crypto_box_PUBLICKEYBYTES);
-        }
+        /* there are interfaces with are incapable of broadcast */
+        if (ioctl(sock, SIOCGIFBRDADDR, &i_faces[i]) < 0)
+            continue;
+
+        /* moot check: only AF_INET returned (backwards compat.) */
+        if (i_faces[i].ifr_broadaddr.sa_family != AF_INET)
+            continue;
+
+        struct sockaddr_in *sock4 = (struct sockaddr_in *)&i_faces[i].ifr_broadaddr;
+        IP_Port *ip_port = &broadcast_ip_port[broadcast_count];
+        ip_port->ip.family = AF_INET;
+        ip_port->ip.ip4.in_addr = sock4->sin_addr;
+        ip_port->port = port;
+        broadcast_count++;
     }
 
     close(sock);
-    return 0;
 }
-#endif
-#endif
+
+/* Send packet to all IPv4 broadcast addresses
+ *
+ *  return 1 if sent to at least one broadcast target.
+ *  return 0 on failure to find any valid broadcast target.
+ */
+static uint32_t send_broadcasts(Networking_Core *net, uint16_t port, uint8_t *data, uint16_t length)
+{
+    /* fetch only once? on every packet? every X seconds?
+     * old: every packet, new: once */
+    if (broadcast_count < 0)
+        fetch_broadcast_info(port);
+
+    if (!broadcast_count)
+        return 0;
+
+    int i;
+
+    for(i = 0; i < broadcast_count; i++)
+        sendpacket(net, broadcast_ip_port[i], data, 1 + crypto_box_PUBLICKEYBYTES);
+
+    return 1;
+}
+#endif /* __linux */
 
 /* Return the broadcast ip. */
 static IP broadcast_ip(sa_family_t family_socket, sa_family_t family_broadcast)
@@ -91,8 +114,6 @@ static IP broadcast_ip(sa_family_t family_socket, sa_family_t family_broadcast)
     IP ip;
     ip_reset(&ip);
 
-#ifdef TOX_ENABLE_IPV6
-
     if (family_socket == AF_INET6) {
         if (family_broadcast == AF_INET6) {
             ip.family = AF_INET6;
@@ -116,14 +137,6 @@ static IP broadcast_ip(sa_family_t family_socket, sa_family_t family_broadcast)
         }
     }
 
-#else
-
-    if (family_socket == AF_INET)
-        if (family_broadcast == AF_INET)
-            ip.uint32 = INADDR_BROADCAST;
-
-#endif
-
     return ip;
 }
 
@@ -132,13 +145,8 @@ static IP broadcast_ip(sa_family_t family_socket, sa_family_t family_broadcast)
  */
 int LAN_ip(IP ip)
 {
-#ifdef TOX_ENABLE_IPV6
-
     if (ip.family == AF_INET) {
         IP4 ip4 = ip.ip4;
-#else
-    IP4 ip4 = ip;
-#endif
 
         /* Loopback. */
         if (ip4.uint8[0] == 127)
@@ -161,9 +169,8 @@ int LAN_ip(IP ip)
                 && ip4.uint8[2] != 255)
             return 0;
 
-#ifdef TOX_ENABLE_IPV6
-    } else if (ip.family == AF_INET6)
-    {
+    } else if (ip.family == AF_INET6) {
+
         /* autogenerated for each interface: FE80::* (up to FEBF::*)
            FF02::1 is - according to RFC 4291 - multicast all-nodes link-local */
         if (((ip.ip6.uint8[0] == 0xFF) && (ip.ip6.uint8[1] < 3) && (ip.ip6.uint8[15] == 1)) ||
@@ -179,8 +186,6 @@ int LAN_ip(IP ip)
         }
     }
 
-#endif
-
     return -1;
 }
 
@@ -206,16 +211,12 @@ int send_LANdiscovery(uint16_t port, Net_Crypto *c)
     memcpy(data + 1, c->self_public_key, crypto_box_PUBLICKEYBYTES);
 
 #ifdef __linux
-#ifndef TOX_ENABLE_IPV6
     send_broadcasts(c->lossless_udp->net, port, data, 1 + crypto_box_PUBLICKEYBYTES);
 #endif
-#endif
     int res = -1;
     IP_Port ip_port;
     ip_port.port = port;
 
-#ifdef TOX_ENABLE_IPV6
-
     /* IPv6 multicast */
     if (c->lossless_udp->net->family == AF_INET6) {
         ip_port.ip = broadcast_ip(AF_INET6, AF_INET6);
@@ -227,9 +228,6 @@ int send_LANdiscovery(uint16_t port, Net_Crypto *c)
 
     /* IPv4 broadcast (has to be IPv4-in-IPv6 mapping if socket is AF_INET6 */
     ip_port.ip = broadcast_ip(c->lossless_udp->net->family, AF_INET);
-#else
-    ip_port.ip = broadcast_ip(AF_INET, AF_INET);
-#endif
 
     if (ip_isset(&ip_port.ip))
         if (sendpacket(c->lossless_udp->net, ip_port, data, 1 + crypto_box_PUBLICKEYBYTES))
diff --git a/toxcore/Lossless_UDP.c b/toxcore/Lossless_UDP.c
index 02fc7251..6d82b768 100644
--- a/toxcore/Lossless_UDP.c
+++ b/toxcore/Lossless_UDP.c
@@ -119,24 +119,15 @@ static uint32_t handshake_id(Lossless_UDP *ludp, IP_Port source)
     id ^= randtable_initget(ludp, i, *uint8);
     i++;
 
-#ifdef TOX_ENABLE_IPV6
-
     if (source.ip.family == AF_INET) {
-        IP4 ip4 = source.ip.ip4;
-#else
-    IP4 ip4 = source.ip;
-#endif
         int k;
 
         for (k = 0; k < 4; k++) {
-            id ^= randtable_initget(ludp, i++, ip4.uint8[k]);
+            id ^= randtable_initget(ludp, i++, source.ip.ip4.uint8[k]);
         }
-
-#ifdef TOX_ENABLE_IPV6
     }
 
-    if (source.ip.family == AF_INET6)
-    {
+    if (source.ip.family == AF_INET6) {
         int k;
 
         for (k = 0; k < 16; k++) {
@@ -144,8 +135,6 @@ static uint32_t handshake_id(Lossless_UDP *ludp, IP_Port source)
         }
     }
 
-#endif
-
     /* id can't be zero. */
     if (id == 0)
         id = 1;
@@ -160,21 +149,18 @@ static uint32_t handshake_id(Lossless_UDP *ludp, IP_Port source)
  */
 static void change_handshake(Lossless_UDP *ludp, IP_Port source)
 {
-#ifdef TOX_ENABLE_IPV6
     uint8_t rand;
 
     if (source.ip.family == AF_INET) {
-        rand = 2 + random_int() % 4;
+        rand = random_int() % 4;
     } else if (source.ip.family == AF_INET6) {
-        rand = 2 + random_int() % 16;
+        rand = random_int() % 16;
     } else {
         return;
     }
 
-#else
-    uint8_t rand = 2 + random_int() % 4;
-#endif
-    ludp->randtable[rand][((uint8_t *)&source.ip)[rand]] = random_int();
+    /* Forced to be more robust against strange definitions of sa_family_t */
+    ludp->randtable[2 + rand][((uint8_t *)&source.ip.ip6)[rand]] = random_int();
 }
 
 /*
@@ -467,8 +453,8 @@ uint32_t sendqueue(Lossless_UDP *ludp, int connection_id)
 /*  return number of packets in all queues waiting to be successfully sent. */
 uint32_t sendqueue_total(Lossless_UDP *ludp)
 {
-    uint32_t total = 0;
-    int i;
+    uint32_t i, total = 0;
+
     for(i = 0; i < ludp->connections.len; i++) {
         Connection *connection = &tox_array_get(&ludp->connections, i, Connection);
         if (connection->status != 0)
diff --git a/toxcore/Lossless_UDP.h b/toxcore/Lossless_UDP.h
index 794381de..d2f1986f 100644
--- a/toxcore/Lossless_UDP.h
+++ b/toxcore/Lossless_UDP.h
@@ -134,14 +134,8 @@ typedef struct {
     tox_array connections;
 
     /* Table of random numbers used in handshake_id. */
-#ifdef TOX_ENABLE_IPV6
     /* IPv6 (16) + port (2)*/
     uint32_t randtable[18][256];
-#else
-    /* IPv4 (4) + port (2) */
-    uint32_t randtable[6][256];
-#endif
-
 } Lossless_UDP;
 
 /*
diff --git a/toxcore/Messenger.c b/toxcore/Messenger.c
index 44570742..6764dfe3 100644
--- a/toxcore/Messenger.c
+++ b/toxcore/Messenger.c
@@ -1700,7 +1700,7 @@ static char *ID2String(uint8_t *client_id)
     uint32_t i;
 
     for (i = 0; i < CLIENT_ID_SIZE; i++)
-        sprintf(&IDString[i], "%02X", client_id[i]);
+        sprintf(&IDString[i * 2], "%02X", client_id[i]);
 
     IDString[CLIENT_ID_SIZE * 2] = 0;
     return IDString;
@@ -1730,24 +1730,20 @@ void doMessenger(Messenger *m)
         for (client = 0; client < LCLIENT_LIST; client++) {
             Client_data *cptr = &m->dht->close_clientlist[client];
             IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-            assoc = &cptr->assoc;
-#else
             uint32_t a;
 
             for (a = 0, assoc = &cptr->assoc4; a < 2; a++, assoc = &cptr->assoc6)
-#endif
-            if (ip_isset(&assoc->ip_port.ip)) {
-                last_pinged = lastdump - assoc->last_pinged;
+                if (ip_isset(&assoc->ip_port.ip)) {
+                    last_pinged = lastdump - assoc->last_pinged;
 
-                if (last_pinged > 999)
-                    last_pinged = 999;
+                    if (last_pinged > 999)
+                        last_pinged = 999;
 
-                snprintf(logbuffer, sizeof(logbuffer), "C[%2u] %s:%u [%3u] %s\n",
-                         client, ip_ntoa(&assoc->ip_port.ip), ntohs(assoc->ip_port.port),
-                         last_pinged, ID2String(cptr->client_id));
-                loglog(logbuffer);
-            }
+                    snprintf(logbuffer, sizeof(logbuffer), "C[%2u] %s:%u [%3u] %s\n",
+                             client, ip_ntoa(&assoc->ip_port.ip), ntohs(assoc->ip_port.port),
+                             last_pinged, ID2String(cptr->client_id));
+                    loglog(logbuffer);
+                }
         }
 
         loglog(" = = = = = = = = \n");
@@ -1791,25 +1787,21 @@ void doMessenger(Messenger *m)
             for (client = 0; client < MAX_FRIEND_CLIENTS; client++) {
                 Client_data *cptr = &dhtfptr->client_list[client];
                 IPPTsPng *assoc = NULL;
-#ifdef CLIENT_ONETOONE_IP
-                assoc = &cptr->assoc;
-#else
                 uint32_t a;
 
                 for (a = 0, assoc = &cptr->assoc4; a < 2; a++, assoc = &cptr->assoc6)
-#endif
-                if (ip_isset(&assoc->ip_port.ip)) {
-                    last_pinged = lastdump - assoc->last_pinged;
+                    if (ip_isset(&assoc->ip_port.ip)) {
+                        last_pinged = lastdump - assoc->last_pinged;
 
-                    if (last_pinged > 999)
-                        last_pinged = 999;
+                        if (last_pinged > 999)
+                            last_pinged = 999;
 
-                    snprintf(logbuffer, sizeof(logbuffer), "F[%2u] => C[%2u] %s:%u [%3u] %s\n",
-                             friend, client, ip_ntoa(&assoc->ip_port.ip),
-                             ntohs(assoc->ip_port.port), last_pinged,
-                             ID2String(cptr->client_id));
-                    loglog(logbuffer);
-                }
+                        snprintf(logbuffer, sizeof(logbuffer), "F[%2u] => C[%2u] %s:%u [%3u] %s\n",
+                                 friend, client, ip_ntoa(&assoc->ip_port.ip),
+                                 ntohs(assoc->ip_port.port), last_pinged,
+                                 ID2String(cptr->client_id));
+                        loglog(logbuffer);
+                    }
             }
         }
 
diff --git a/toxcore/network.c b/toxcore/network.c
index 3abd71e0..ee950d97 100644
--- a/toxcore/network.c
+++ b/toxcore/network.c
@@ -41,7 +41,9 @@
 static const char *inet_ntop(sa_family_t family, void *addr, char *buf, size_t bufsize)
 {
     if (family == AF_INET) {
-        struct sockaddr_in saddr = { 0 };
+        struct sockaddr_in saddr;
+        memset(&saddr, 0, sizeof(saddr));
+
         saddr.sin_family = AF_INET;
         saddr.sin_addr = *(struct in_addr *)addr;
 
@@ -52,7 +54,9 @@ static const char *inet_ntop(sa_family_t family, void *addr, char *buf, size_t b
 
         return buf;
     } else if (family == AF_INET6) {
-        struct sockaddr_in6 saddr = { 0 };
+        struct sockaddr_in6 saddr;
+        memset(&saddr, 0, sizeof(saddr));
+
         saddr.sin6_family = AF_INET6;
         saddr.sin6_addr = *(struct in6_addr *)addr;
 
@@ -70,7 +74,8 @@ static const char *inet_ntop(sa_family_t family, void *addr, char *buf, size_t b
 static int inet_pton(sa_family_t family, const char *addrString, void *addrbuf)
 {
     if (family == AF_INET) {
-        struct sockaddr_in saddr = { 0 };
+        struct sockaddr_in saddr;
+        memset(&saddr, 0, sizeof(saddr));
 
         INT len = sizeof(saddr);
 
@@ -81,7 +86,8 @@ static int inet_pton(sa_family_t family, const char *addrString, void *addrbuf)
 
         return 1;
     } else if (family == AF_INET6) {
-        struct sockaddr_in6 saddr = { 0 };
+        struct sockaddr_in6 saddr;
+        memset(&saddr, 0, sizeof(saddr));
 
         INT len = sizeof(saddr);
 
@@ -142,24 +148,19 @@ static void loglogdata(char *message, uint8_t *buffer, size_t buflen, IP_Port *i
  */
 int sendpacket(Networking_Core *net, IP_Port ip_port, uint8_t *data, uint32_t length)
 {
-#ifdef TOX_ENABLE_IPV6
-
     /* socket AF_INET, but target IP NOT: can't send */
     if ((net->family == AF_INET) && (ip_port.ip.family != AF_INET))
         return -1;
 
-#endif
-
     struct sockaddr_storage addr;
     size_t addrsize = 0;
 
-#ifdef TOX_ENABLE_IPV6
-
     if (ip_port.ip.family == AF_INET) {
         if (net->family == AF_INET6) {
             /* must convert to IPV4-in-IPV6 address */
-            addrsize = sizeof(struct sockaddr_in6);
             struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
+
+            addrsize = sizeof(struct sockaddr_in6);
             addr6->sin6_family = AF_INET6;
             addr6->sin6_port = ip_port.port;
 
@@ -176,48 +177,36 @@ int sendpacket(Networking_Core *net, IP_Port ip_port, uint8_t *data, uint32_t le
             addr6->sin6_flowinfo = 0;
             addr6->sin6_scope_id = 0;
         } else {
-            IP4 ip4 = ip_port.ip.ip4;
-#else
-    IP4 ip4 = ip_port.ip;
-#endif
-            addrsize = sizeof(struct sockaddr_in);
             struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
+
+            addrsize = sizeof(struct sockaddr_in);
             addr4->sin_family = AF_INET;
-            addr4->sin_addr = ip4.in_addr;
+            addr4->sin_addr = ip_port.ip.ip4.in_addr;
             addr4->sin_port = ip_port.port;
-#ifdef TOX_ENABLE_IPV6
         }
-    } else if (ip_port.ip.family == AF_INET6)
-    {
-        addrsize = sizeof(struct sockaddr_in6);
+    } else if (ip_port.ip.family == AF_INET6) {
         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
+
+        addrsize = sizeof(struct sockaddr_in6);
         addr6->sin6_family = AF_INET6;
         addr6->sin6_port = ip_port.port;
         addr6->sin6_addr = ip_port.ip.ip6.in6_addr;
 
         addr6->sin6_flowinfo = 0;
         addr6->sin6_scope_id = 0;
-    } else
-    {
+    } else {
         /* unknown address type*/
         return -1;
     }
 
-#endif
-
     int res = sendto(net->sock, (char *) data, length, 0, (struct sockaddr *)&addr, addrsize);
 #ifdef LOGGING
     loglogdata("O=>", data, length, &ip_port, res);
 #endif
 
-    if (res == length)
+    if ((res >= 0) && ((uint32_t)res == length))
         net->send_fail_eagain = 0;
-
-#ifdef WIN32
-    else if ((res < 0) && (errno == WSAEWOULDBLOCK))
-#else
-    else if ((res < 0) && (errno == EAGAIN))
-#endif
+    else if ((res < 0) && (errno == EWOULDBLOCK))
         net->send_fail_eagain = current_time();
 
     return res;
@@ -254,32 +243,21 @@ static int receivepacket(sock_t sock, IP_Port *ip_port, uint8_t *data, uint32_t
 
     *length = (uint32_t)fail_or_len;
 
-#ifdef TOX_ENABLE_IPV6
-
     if (addr.ss_family == AF_INET) {
         struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
+
         ip_port->ip.family = addr_in->sin_family;
         ip_port->ip.ip4.in_addr = addr_in->sin_addr;
         ip_port->port = addr_in->sin_port;
     } else if (addr.ss_family == AF_INET6) {
         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)&addr;
+
         ip_port->ip.family = addr_in6->sin6_family;
         ip_port->ip.ip6.in6_addr = addr_in6->sin6_addr;
         ip_port->port = addr_in6->sin6_port;
     } else
         return -1;
 
-#else
-
-    if (addr.ss_family == AF_INET) {
-        struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
-        ip_port->ip.in_addr = addr_in->sin_addr;
-        ip_port->port = addr_in->sin_port;
-    } else
-        return -1;
-
-#endif
-
 #ifdef LOGGING
     loglogdata("=>O", data, MAX_UDP_PACKET_SIZE, ip_port, *length);
 #endif
@@ -389,10 +367,13 @@ int networking_wait_execute(uint8_t *data, uint16_t len, uint16_t milliseconds)
     /* returns -1 on error, 0 on timeout, the socket on activity */
     int res = select(nfds, &readfds, &writefds, &exceptfds, &timeout);
 #ifdef LOGGING
-    sprintf(logbuffer, "select(%d): %d (%d, %s) - %d %d %d\n", milliseconds, res, errno,
-            strerror(errno), FD_ISSET(s->sock, &readfds), FD_ISSET(s->sock, &writefds),
-            FD_ISSET(s->sock, &exceptfds));
-    loglog(logbuffer);
+    /* only dump if not timeout */
+    if (res) {
+        sprintf(logbuffer, "select(%d): %d (%d, %s) - %d %d %d\n", milliseconds, res, errno,
+                           strerror(errno), FD_ISSET(s->sock, &readfds), FD_ISSET(s->sock, &writefds),
+                           FD_ISSET(s->sock, &exceptfds));
+        loglog(logbuffer);
+    }
 #endif
 
     if (FD_ISSET(s->sock, &writefds))
@@ -448,8 +429,6 @@ static void at_shutdown(void)
  */
 Networking_Core *new_networking(IP ip, uint16_t port)
 {
-#ifdef TOX_ENABLE_IPV6
-
     /* maybe check for invalid IPs like 224+.x.y.z? if there is any IP set ever */
     if (ip.family != AF_INET && ip.family != AF_INET6) {
 #ifdef DEBUG
@@ -458,8 +437,6 @@ Networking_Core *new_networking(IP ip, uint16_t port)
         return NULL;
     }
 
-#endif
-
     if (at_startup() != 0)
         return NULL;
 
@@ -468,11 +445,7 @@ Networking_Core *new_networking(IP ip, uint16_t port)
     if (temp == NULL)
         return NULL;
 
-#ifdef TOX_ENABLE_IPV6
     temp->family = ip.family;
-#else
-    temp->family = AF_INET;
-#endif
     temp->port = 0;
 
     /* Initialize our socket. */
@@ -487,7 +460,7 @@ Networking_Core *new_networking(IP ip, uint16_t port)
         return NULL;
     }
 
-#else
+#else /* !WIN32 */
 
     if (temp->sock < 0) {
 #ifdef DEBUG
@@ -497,7 +470,7 @@ Networking_Core *new_networking(IP ip, uint16_t port)
         return NULL;
     }
 
-#endif
+#endif /* !WIN32 */
 
     /* Functions to increase the size of the send and receive UDP buffers.
      */
@@ -515,33 +488,28 @@ Networking_Core *new_networking(IP ip, uint16_t port)
     u_long mode = 1;
     /* ioctl(sock, FIONBIO, &mode); */
     ioctlsocket(temp->sock, FIONBIO, &mode);
-#else
+#else /* !WIN32 */
     fcntl(temp->sock, F_SETFL, O_NONBLOCK, 1);
-#endif
+#endif /* !WIN32 */
 
     /* Bind our socket to port PORT and the given IP address (usually 0.0.0.0 or ::) */
     uint16_t *portptr = NULL;
     struct sockaddr_storage addr;
     size_t addrsize;
-#ifdef TOX_ENABLE_IPV6
 
     if (temp->family == AF_INET) {
-        IP4 ip4 = ip.ip4;
-#else
-    IP4 ip4 = ip;
-#endif
-        addrsize = sizeof(struct sockaddr_in);
         struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
+
+        addrsize = sizeof(struct sockaddr_in);
         addr4->sin_family = AF_INET;
         addr4->sin_port = 0;
-        addr4->sin_addr = ip4.in_addr;
+        addr4->sin_addr = ip.ip4.in_addr;
 
         portptr = &addr4->sin_port;
-#ifdef TOX_ENABLE_IPV6
-    } else if (temp->family == AF_INET6)
-    {
-        addrsize = sizeof(struct sockaddr_in6);
+    } else if (temp->family == AF_INET6) {
         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
+
+        addrsize = sizeof(struct sockaddr_in6);
         addr6->sin6_family = AF_INET6;
         addr6->sin6_port = 0;
         addr6->sin6_addr = ip.ip6.in6_addr;
@@ -556,22 +524,38 @@ Networking_Core *new_networking(IP ip, uint16_t port)
     if (ip.family == AF_INET6)
     {
         char ipv6only = 0;
+        socklen_t optsize = sizeof(ipv6only);
 #ifdef LOGGING
         errno = 0;
-        int res =
 #endif
-            setsockopt(temp->sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&ipv6only, sizeof(ipv6only));
+        int res = getsockopt(temp->sock, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6only, &optsize);
+        if ((res == 0) && (ipv6only == 0)) {
 #ifdef LOGGING
+            loglog("Dual-stack socket: enabled per default.\n");
+#endif
+        } else {
+            ipv6only = 0;
+#ifdef LOGGING
+            if (res < 0) {
+                sprintf(logbuffer, "Dual-stack socket: Failed to query default. (%d, %s)\n",
+                        errno, strerror(errno));
+                loglog(logbuffer);
+            }
 
-        if (res < 0) {
-            sprintf(logbuffer,
-                    "Failed to enable dual-stack on IPv6 socket, won't be able to receive from/send to IPv4 addresses. (%u, %s)\n",
-                    errno, strerror(errno));
-            loglog(logbuffer);
-        } else
-            loglog("Embedded IPv4 addresses enabled successfully.\n");
-
+            errno = 0;
+            res =
+#endif
+                  setsockopt(temp->sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&ipv6only, sizeof(ipv6only));
+#ifdef LOGGING
+            if (res < 0) {
+                sprintf(logbuffer,
+                        "Dual-stack socket: Failed to enable, won't be able to receive from/send to IPv4 addresses. (%u, %s)\n",
+                        errno, strerror(errno));
+                loglog(logbuffer);
+            } else
+                loglog("Dual-stack socket: Enabled successfully.\n");
 #endif
+        }
 
         /* multicast local nodes */
         struct ipv6_mreq mreq;
@@ -597,8 +581,6 @@ Networking_Core *new_networking(IP ip, uint16_t port)
 #endif
     }
 
-#endif
-
     /* a hanging program or a different user might block the standard port;
      * as long as it isn't a parameter coming from the commandline,
      * try a few ports after it, to see if we can find a "free" one
@@ -681,14 +663,16 @@ int ip_equal(IP *a, IP *b)
     if (!a || !b)
         return 0;
 
-#ifdef TOX_ENABLE_IPV6
-
     /* same family */
     if (a->family == b->family) {
         if (a->family == AF_INET)
             return (a->ip4.in_addr.s_addr == b->ip4.in_addr.s_addr);
         else if (a->family == AF_INET6)
+#ifdef WIN32
+            return IN6_ADDR_EQUAL(&a->ip6.in6_addr, &b->ip6.in6_addr);
+#else
             return IN6_ARE_ADDR_EQUAL(&a->ip6.in6_addr, &b->ip6.in6_addr);
+#endif
         else
             return 0;
     }
@@ -703,9 +687,6 @@ int ip_equal(IP *a, IP *b)
     }
 
     return 0;
-#else
-    return (a->uint32 == b->uint32);
-#endif
 };
 
 /* ipport_equal
@@ -731,11 +712,7 @@ void ip_reset(IP *ip)
     if (!ip)
         return;
 
-#ifdef TOX_ENABLE_IPV6
     memset(ip, 0, sizeof(IP));
-#else
-    ip->uint32 = 0;
-#endif
 };
 
 /* nulls out ip, sets family according to flag */
@@ -744,12 +721,8 @@ void ip_init(IP *ip, uint8_t ipv6enabled)
     if (!ip)
         return;
 
-#ifdef TOX_ENABLE_IPV6
     memset(ip, 0, sizeof(IP));
     ip->family = ipv6enabled ? AF_INET6 : AF_INET;
-#else
-    ip->uint32 = 0;
-#endif
 };
 
 /* checks if ip is valid */
@@ -758,11 +731,7 @@ int ip_isset(IP *ip)
     if (!ip)
         return 0;
 
-#ifdef TOX_ENABLE_IPV6
     return (ip->family != 0);
-#else
-    return (ip->uint32 != 0);
-#endif
 };
 
 /* checks if ip is valid */
@@ -804,27 +773,23 @@ static char addresstext[96];
 const char *ip_ntoa(IP *ip)
 {
     if (ip) {
-#ifdef TOX_ENABLE_IPV6
-
         if (ip->family == AF_INET) {
-            addresstext[0] = 0;
+            /* returns standard quad-dotted notation */
             struct in_addr *addr = (struct in_addr *)&ip->ip4;
+
+            addresstext[0] = 0;
             inet_ntop(ip->family, addr, addresstext, sizeof(addresstext));
         } else if (ip->family == AF_INET6) {
-            addresstext[0] = '[';
+            /* returns hex-groups enclosed into square brackets */
             struct in6_addr *addr = (struct in6_addr *)&ip->ip6;
+
+            addresstext[0] = '[';
             inet_ntop(ip->family, addr, &addresstext[1], sizeof(addresstext) - 3);
             size_t len = strlen(addresstext);
             addresstext[len] = ']';
             addresstext[len + 1] = 0;
         } else
             snprintf(addresstext, sizeof(addresstext), "(IP invalid, family %u)", ip->family);
-
-#else
-        addresstext[0] = 0;
-        struct in_addr *addr = (struct in_addr *)&ip;
-        inet_ntop(AF_INET, addr, addresstext, sizeof(addresstext));
-#endif
     } else
         snprintf(addresstext, sizeof(addresstext), "(IP invalid: NULL)");
 
@@ -852,7 +817,6 @@ int addr_parse_ip(const char *address, IP *to)
     if (!address || !to)
         return 0;
 
-#ifdef TOX_ENABLE_IPV6
     struct in_addr addr4;
 
     if (1 == inet_pton(AF_INET, address, &addr4)) {
@@ -869,16 +833,6 @@ int addr_parse_ip(const char *address, IP *to)
         return 1;
     };
 
-#else
-    struct in_addr addr4;
-
-    if (1 == inet_pton(AF_INET, address, &addr4)) {
-        to->in_addr = addr4;
-        return 1;
-    };
-
-#endif
-
     return 0;
 };
 
@@ -905,12 +859,7 @@ int addr_resolve(const char *address, IP *to, IP *extra)
     if (!address || !to)
         return 0;
 
-    sa_family_t family;
-#ifdef TOX_ENABLE_IPV6
-    family = to->family;
-#else
-    family = AF_INET;
-#endif
+    sa_family_t family = to->family;
 
     struct addrinfo *server = NULL;
     struct addrinfo *walker = NULL;
@@ -931,36 +880,25 @@ int addr_resolve(const char *address, IP *to, IP *extra)
         return 0;
     }
 
-#ifdef TOX_ENABLE_IPV6
     IP4 ip4;
     memset(&ip4, 0, sizeof(ip4));
     IP6 ip6;
     memset(&ip6, 0, sizeof(ip6));
-#endif
 
     for (walker = server; (walker != NULL) && (rc != 3); walker = walker->ai_next) {
         switch (walker->ai_family) {
             case AF_INET:
                 if (walker->ai_family == family) { /* AF_INET requested, done */
                     struct sockaddr_in *addr = (struct sockaddr_in *)walker->ai_addr;
-#ifdef TOX_ENABLE_IPV6
                     to->ip4.in_addr = addr->sin_addr;
-#else
-                    to->in_addr = addr->sin_addr;
-#endif
                     rc = 3;
-                }
-
-#ifdef TOX_ENABLE_IPV6
-                else if (!(rc & 1)) { /* AF_UNSPEC requested, store away */
+                } else if (!(rc & 1)) { /* AF_UNSPEC requested, store away */
                     struct sockaddr_in *addr = (struct sockaddr_in *)walker->ai_addr;
                     ip4.in_addr = addr->sin_addr;
                     rc |= 1;
                 }
 
-#endif
                 break; /* switch */
-#ifdef TOX_ENABLE_IPV6
 
             case AF_INET6:
                 if (walker->ai_family == family) { /* AF_INET6 requested, done */
@@ -978,12 +916,9 @@ int addr_resolve(const char *address, IP *to, IP *extra)
                 }
 
                 break; /* switch */
-#endif
         }
     }
 
-#ifdef TOX_ENABLE_IPV6
-
     if (to->family == AF_UNSPEC) {
         if (rc & 2) {
             to->family = AF_INET6;
@@ -1000,9 +935,6 @@ int addr_resolve(const char *address, IP *to, IP *extra)
             rc = 0;
     }
 
-#endif
-
-
     freeaddrinfo(server);
     return rc;
 }
@@ -1040,10 +972,11 @@ static void loglogdata(char *message, uint8_t *buffer, size_t buflen, IP_Port *i
     data[0] = buflen > 4 ? ntohl(*(uint32_t *)&buffer[1]) : 0;
     data[1] = buflen > 7 ? ntohl(*(uint32_t *)&buffer[5]) : 0;
 
+    /* Windows doesn't necessarily know %zu */
     if (res < 0) {
-        int written = snprintf(logbuffer, sizeof(logbuffer), "[%2u] %s %3hu%c %s:%hu (%u: %s) | %04x%04x\n",
-                               buffer[0], message, (buflen < 999 ? (uint16_t)buflen : 999), 'E',
-                               ip_ntoa(&ip_port->ip), port, errno, strerror(errno), data[0], data[1]);
+        snprintf(logbuffer, sizeof(logbuffer), "[%2u] %s %3hu%c %s:%hu (%u: %s) | %04x%04x\n",
+                 buffer[0], message, (buflen < 999 ? (uint16_t)buflen : 999), 'E',
+                 ip_ntoa(&ip_port->ip), port, errno, strerror(errno), data[0], data[1]);
     } else if ((res > 0) && ((size_t)res <= buflen))
         snprintf(logbuffer, sizeof(logbuffer), "[%2u] %s %3zu%c %s:%hu (%u: %s) | %04x%04x\n",
                  buffer[0], message, (res < 999 ? (size_t)res : 999), ((size_t)res < buflen ? '<' : '='),
diff --git a/toxcore/network.h b/toxcore/network.h
index 8a0e20dc..1253c07e 100644
--- a/toxcore/network.h
+++ b/toxcore/network.h
@@ -40,14 +40,11 @@
 #include <ws2tcpip.h>
 
 typedef unsigned int sock_t;
-typedef INT sa_family_t;
-
-#ifndef IN6_ARE_ADDR_EQUAL
-#define IN6_ARE_ADDR_EQUAL(a,b) \
-    ((((__const uint32_t *) (a))[0] == ((__const uint32_t *) (b))[0]) \
-  && (((__const uint32_t *) (a))[1] == ((__const uint32_t *) (b))[1]) \
-  && (((__const uint32_t *) (a))[2] == ((__const uint32_t *) (b))[2]) \
-  && (((__const uint32_t *) (a))[3] == ((__const uint32_t *) (b))[3]))
+/* sa_family_t is the sockaddr_in / sockaddr_in6 family field */
+typedef short sa_family_t;
+
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
 #endif
 
 #else // Linux includes
@@ -103,7 +100,6 @@ typedef int sock_t;
 /* Current time, unix format */
 #define unix_time() ((uint64_t)time(NULL))
 
-
 typedef union {
     uint8_t uint8[4];
     uint16_t uint16[2];
@@ -124,7 +120,7 @@ typedef struct {
         IP4 ip4;
         IP6 ip6;
     };
-} IPAny;
+} IP;
 
 typedef union {
     struct {
@@ -136,24 +132,12 @@ typedef union {
     uint8_t uint8[8];
 } IP4_Port;
 
-/* will replace IP_Port as soon as the complete infrastructure is in place
- * removed the unused union and padding also */
 typedef struct {
-    IPAny ip;
+    IP ip;
     uint16_t port;
-} IPAny_Port;
+} IP_Port;
 
-/* #undef TOX_ENABLE_IPV6 */
-#define TOX_ENABLE_IPV6
-#ifdef TOX_ENABLE_IPV6
 #define TOX_ENABLE_IPV6_DEFAULT 1
-typedef IPAny IP;
-typedef IPAny_Port IP_Port;
-#else
-#define TOX_ENABLE_IPV6_DEFAULT 0
-typedef IP4 IP;
-typedef IP4_Port IP_Port;
-#endif
 
 /* ip_ntoa
  *   converts ip into a string
diff --git a/toxcore/tox.h b/toxcore/tox.h
index 39832073..bcc89ce1 100644
--- a/toxcore/tox.h
+++ b/toxcore/tox.h
@@ -36,7 +36,9 @@
 #include <windows.h>
 #include <ws2tcpip.h>
 
-typedef INT sa_family_t;
+/* sa_family_t is the sockaddr_in / sockaddr_in6 family field */
+typedef short sa_family_t;
+
 #ifndef true
 #define true 1
 #endif
@@ -69,7 +71,6 @@ typedef union {
     uint32_t i;
 } tox_IP4;
 
-
 typedef union {
     uint8_t uint8[16];
     uint16_t uint16[8];
@@ -83,36 +84,16 @@ typedef struct {
         tox_IP4 ip4;
         tox_IP6 ip6;
     };
-} tox_IPAny;
-
-typedef union {
-    struct {
-        tox_IP4  ip;
-        uint16_t port;
-        /* Not used for anything right now. */
-        uint16_t padding;
-    };
-    uint8_t uint8[8];
-} tox_IP4_Port;
+} tox_IP;
 
 /* will replace IP_Port as soon as the complete infrastructure is in place
  * removed the unused union and padding also */
 typedef struct {
-    tox_IPAny ip;
+    tox_IP    ip;
     uint16_t  port;
-} tox_IPAny_Port;
+} tox_IP_Port;
 
-/* #undef TOX_ENABLE_IPV6 */
-#define TOX_ENABLE_IPV6
-#ifdef TOX_ENABLE_IPV6
 #define TOX_ENABLE_IPV6_DEFAULT 1
-typedef tox_IPAny tox_IP;
-typedef tox_IPAny_Port tox_IP_Port;
-#else
-#define TOX_ENABLE_IPV6_DEFAULT 0
-typedef tox_IP4 tox_IP;
-typedef tox_IP4_Port tox_IP_Port;
-#endif
 
 
 /* Errors for m_addfriend
diff --git a/toxcore/util.c b/toxcore/util.c
index 8fc6806e..a1de6392 100644
--- a/toxcore/util.c
+++ b/toxcore/util.c
@@ -109,6 +109,7 @@ void loginit(uint16_t port)
 
     struct tm *tm = localtime(&starttime);
 
+    /* "%F %T" might not be Windows compatible */
     if (strftime(logbuffer + 32, sizeof(logbuffer) - 32, "%F %T", tm))
         sprintf(logbuffer, "%u-%s.log", ntohs(port), logbuffer + 32);
     else
@@ -149,7 +150,7 @@ void loglog(char *text)
     if (!logbufferpredata)
         return;
 
-    if (len + logbufferprehead - logbufferpredata + 16U < logbufferprelen) {
+    if (len + (logbufferprehead - logbufferpredata) + 16U < logbufferprelen) {
         size_t logpos = logbufferprehead - logbufferpredata;
         size_t lennew = logbufferprelen * 1.4;
         logbufferpredata = realloc(logbufferpredata, lennew);