tox.h, DHT.h:

- tox_bootstrap_ex(), DHT_bootstrap_ex() renamed to tox_bootstrap_from_address(), DHT_bootstrap_from_address()
- (handle_)sendnodes_ex() renamed to (handle_)sendnodes_ipv6()
- only sending sendnodes_ipv6() if we're actually IPv6 enabled
- changed comments to conform better

nTox.c, Messenger_text.c, DHT_test.c, DHT_bootstrap.c:
- fallout from *_ex() to *_from_address()

DHT_bootstrap.c:
- corrected a potentially wrong info message

util.c:
- fixed logfile name: now (funcptr) => now() (number)

network.c:
- addead comment about the necessity of bind() to succeed

auto_test/messenger_test.c:
- defaulting ipv6enabled to TOX_ENABLE_IPV6_DEFAULT

LAN_discovery.c:
- slight cleanup and comments for clarity

auto_tests/messenger_test.c

@@ -278,8 +278,8 @@ int main(int argc, char *argv[])
     good_id_b = hex_string_to_bin(good_id_b_str);
     bad_id    = hex_string_to_bin(bad_id_str);
 
-    /* no IPv6 enabled yet */
-    m = initMessenger(0);
+    /* IPv6 status from global define */
+    m = initMessenger(TOX_ENABLE_IPV6_DEFAULT);
 
     /* setup a default friend and friendnum */
     if (m_addfriend_norequest(m, (uint8_t *)friend_id) < 0)

other/DHT_bootstrap.c

@@ -122,13 +122,14 @@ int main(int argc, char *argv[])
     fclose(file);
 
     printf("\n");
-    printf("Port: %u\n", PORT);
+    printf("Port: %u\n", ntohs(dht->c->lossless_udp->net->port));
 
     if (argc > argvoffset + 3) {
         printf("Trying to bootstrap into the network...\n");
         uint16_t port = htons(atoi(argv[argvoffset + 2]));
         uint8_t *bootstrap_key = hex_string_to_bin(argv[argvoffset + 3]);
-        int res = DHT_bootstrap_ex(dht, argv[argvoffset + 1], ipv6enabled, port, bootstrap_key);
+        int res = DHT_bootstrap_from_address(dht, argv[argvoffset + 1],
+                                            ipv6enabled, port, bootstrap_key);
         free(bootstrap_key);
 
         if (!res) {

testing/DHT_test.c

@@ -175,7 +175,7 @@ int main(int argc, char *argv[])
 
     uint16_t port = htons(atoi(argv[argvoffset + 2]));
     unsigned char *binary_string = hex_string_to_bin(argv[argvoffset + 3]);
-    int res = DHT_bootstrap_ex(dht, argv[argvoffset + 1], ipv6enabled, port, binary_string);
+    int res = DHT_bootstrap_from_address(dht, argv[argvoffset + 1], ipv6enabled, port, binary_string);
     free(binary_string);
     if (!res) {
         printf("Failed to convert \"%s\" into an IP address. Exiting...\n", argv[argvoffset + 1]);

testing/Messenger_test.c

@@ -119,7 +119,8 @@ int main(int argc, char *argv[])
     if (argc == argvoffset + 4) {
         uint16_t port = htons(atoi(argv[argvoffset + 2]));
         uint8_t *bootstrap_key = hex_string_to_bin(argv[argvoffset + 3]);
-        int res = DHT_bootstrap_ex(m->dht, argv[argvoffset + 1], ipv6enabled, port, bootstrap_key);
+        int res = DHT_bootstrap_from_address(m->dht, argv[argvoffset + 1],
+                                              ipv6enabled, port, bootstrap_key);
         free(bootstrap_key);
         if (!res) {
             printf("Failed to convert \"%s\" into an IP address. Exiting...\n", argv[argvoffset + 1]);

testing/nTox.c

@@ -592,7 +592,7 @@ int main(int argc, char *argv[])
 
     uint16_t port = htons(atoi(argv[argvoffset + 2]));
     unsigned char *binary_string = hex_string_to_bin(argv[argvoffset + 3]);
-    int res = tox_bootstrap_ex(m, argv[argvoffset + 1], ipv6enabled, port, binary_string);
+    int res = tox_bootstrap_from_address(m, argv[argvoffset + 1], ipv6enabled, port, binary_string);
     free(binary_string);
 
     if (!res) {

toxcore/DHT.c

@@ -617,7 +617,7 @@ static int sendnodes(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *cl
 
 #ifdef TOX_ENABLE_IPV6
 /* Send a send nodes response: message for IPv6 nodes */
-static int sendnodes_ex(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *client_id, uint64_t ping_id)
+static int sendnodes_ipv6(DHT *dht, IP_Port ip_port, uint8_t *public_key, uint8_t *client_id, uint64_t ping_id)
 {
     /* Check if packet is going to be sent to ourself. */
     if (id_equal(public_key, dht->c->self_public_key))
@@ -691,7 +691,9 @@ 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_ex(dht, source, packet + 1, plain + sizeof(ping_id), ping_id);
+    /* only try to send IPv6 nodes if the ipv6enabled flag was given */
+    if (dht->c->lossless_udp->net->family == AF_INET6)
+        sendnodes_ipv6(dht, source, packet + 1, plain + sizeof(ping_id), ping_id);
 #endif
 
     //send_ping_request(dht, source, packet + 1); /* TODO: make this smarter? */
@@ -766,7 +768,7 @@ static int handle_sendnodes(void *object, IP_Port source, uint8_t *packet, uint3
 }
 
 #ifdef TOX_ENABLE_IPV6
-static int handle_sendnodes_ex(void *object, IP_Port source, uint8_t *packet, uint32_t length)
+static int handle_sendnodes_ipv6(void *object, IP_Port source, uint8_t *packet, uint32_t length)
 {
     DHT *dht = object;
     uint64_t ping_id;
@@ -979,7 +981,8 @@ void DHT_bootstrap(DHT *dht, IP_Port ip_port, uint8_t *public_key)
     getnodes(dht, ip_port, public_key, dht->c->self_public_key);
     send_ping_request(dht->ping, dht->c, ip_port, public_key);
 }
-int DHT_bootstrap_ex(DHT *dht, const char *address, uint8_t ipv6enabled, uint16_t port, uint8_t *public_key)
+int DHT_bootstrap_from_address(DHT *dht, const char *address, uint8_t ipv6enabled,
+                                            uint16_t port, uint8_t *public_key)
 {
     IP_Port ip_port;
     ip_init(&ip_port.ip, ipv6enabled);
@@ -1400,7 +1403,7 @@ DHT *new_DHT(Net_Crypto *c)
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_GET_NODES, &handle_getnodes, temp);
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES, &handle_sendnodes, temp);
 #ifdef TOX_ENABLE_IPV6
-    networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES_EX, &handle_sendnodes_ex, temp);
+    networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES_EX, &handle_sendnodes_ipv6, temp);
 #endif
     init_cryptopackets(temp);
     cryptopacket_registerhandler(c, CRYPTO_PACKET_NAT_PING, &handle_NATping, temp);

toxcore/DHT.h

@@ -136,7 +136,7 @@ int DHT_delfriend(DHT *dht, uint8_t *client_id);
  *  ip must be 4 bytes long.
  *  port must be 2 bytes long.
  *
- * !!! Signature changed!!!
+ * !!! Signature changed !!!
  *
  * OLD: IP_Port DHT_getfriendip(DHT *dht, uint8_t *client_id);
  *
@@ -155,12 +155,26 @@ int DHT_getfriendip(DHT *dht, uint8_t *client_id, IP_Port *ip_port);
 /* Run this function at least a couple times per second (It's the main loop). */
 void do_DHT(DHT *dht);
 
-/* Use this function to bootstrap the client.
- *  Sends a get nodes request to the given node with ip port and public_key.
- * DHT_bootstrap_ex() returns 1 if the address could be converted, 0 otherwise
+/*
+ *  Use these two functions to bootstrap the client.
+ */
+/* Sends a "get nodes" request to the given node with ip, port and public_key
+ *   to setup connections
  */
 void DHT_bootstrap(DHT *dht, IP_Port ip_port, uint8_t *public_key);
-int DHT_bootstrap_ex(DHT *dht, const char *address, uint8_t ipv6enabled, uint16_t port, uint8_t *public_key);
+/* Resolves address into an IP address. If successful, sends a "get nodes"
+ *   request to the given node with ip, port and public_key to setup connections
+ *
+ * address can be a hostname or an IP address (IPv4 or IPv6).
+ * if ipv6enabled is 0 (zero), the resolving sticks STRICTLY to IPv4 addresses
+ * if ipv6enabled is not 0 (zero), the resolving looks for IPv6 addresses first,
+ *   then IPv4 addresses.
+ * 
+ *  returns 1 if the address could be converted into an IP address
+ *  returns 0 otherwise
+ */
+int DHT_bootstrap_from_address(DHT *dht, const char *address, uint8_t ipv6enabled,
+                                            uint16_t port, uint8_t *public_key);
 
 /* Add nodes to the toping list.
  * All nodes in this list are pinged every TIME_TOPING seconds

toxcore/LAN_discovery.c

@@ -112,7 +112,9 @@ static IP broadcast_ip(sa_family_t family_socket, sa_family_t family_broadcast)
         }
     }
 #else
-    ip.uint32 = INADDR_BROADCAST;
+    if (family_socket == AF_INET)
+        if (family_broadcast == AF_INET)
+            ip.uint32 = INADDR_BROADCAST;
 #endif
 
     return ip;
@@ -193,23 +195,22 @@ int send_LANdiscovery(uint16_t port, Net_Crypto *c)
     ip_port.port = port;
 
 #ifdef TOX_ENABLE_IPV6
+    /* IPv6 multicast */
     if (c->lossless_udp->net->family == AF_INET6) {
-        ip_port.ip = broadcast_ip(c->lossless_udp->net->family, AF_INET6);
+        ip_port.ip = broadcast_ip(AF_INET6, AF_INET6);
         if (ip_isset(&ip_port.ip))
             if (sendpacket(c->lossless_udp->net, ip_port, data, 1 + crypto_box_PUBLICKEYBYTES) > 0)
                 res = 1;
     }
 
+    /* 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);
-    if (ip_isset(&ip_port.ip))
-        if (sendpacket(c->lossless_udp->net, ip_port, data, 1 + crypto_box_PUBLICKEYBYTES))
-            res = 1;
 #else
-    ip_port.ip = broadcast_ip(c->lossless_udp->net->family, AF_INET);
+    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))
             res = 1;
-#endif
 
     return res;
 }

toxcore/network.c

@@ -312,7 +312,7 @@ Networking_Core *new_networking(IP ip, uint16_t port)
         return -1;
     */
 
-    /* Enable broadcast on socket? */
+    /* Enable broadcast on socket */
     int broadcast = 1;
     setsockopt(temp->sock, SOL_SOCKET, SO_BROADCAST, (char *)&broadcast, sizeof(broadcast));
 
@@ -402,6 +402,18 @@ Networking_Core *new_networking(IP ip, uint16_t port)
     /* 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
+     *
+     * if we go on without binding, the first sendto() automatically binds to
+     * a free port chosen by the system (i.e. anything from 1024 to 65535)
+     *
+     * returning NULL after bind fails has both advantages and disadvantages:
+     * advantage:
+     *   we can rely on getting the port in the range 33445..33450, which
+     *   enables us to tell joe user to open their firewall to a small range
+     *
+     * disadvantage:
+     *   some clients might not test return of tox_new(), blindly assuming that
+     *   it worked ok (which it did previously without a successful bind)
      */
     int tries, res;
     for(tries = 0; tries < 9; tries++)

toxcore/tox.c

@@ -374,11 +374,11 @@ void tox_bootstrap(void *tox, IP_Port ip_port, uint8_t *public_key)
     Messenger *m = tox;
     DHT_bootstrap(m->dht, ip_port, public_key);
 }
-int tox_bootstrap_ex(void *tox, const char *address, uint8_t ipv6enabled,
-                      uint16_t port, uint8_t *public_key)
+int tox_bootstrap_from_address(void *tox, const char *address,
+                        uint8_t ipv6enabled, uint16_t port, uint8_t *public_key)
 {
     Messenger *m = tox;
-    return DHT_bootstrap_ex(m->dht, address, ipv6enabled, port, public_key);
+    return DHT_bootstrap_from_address(m->dht, address, ipv6enabled, port, public_key);
 };
 
 /*  return 0 if we are not connected to the DHT.

toxcore/tox.h

@@ -338,12 +338,25 @@ void tox_callback_read_receipt(Tox *tox, void (*function)(Tox *tox, int, uint32_
  */
 void tox_callback_connectionstatus(Tox *tox, void (*function)(Tox *tox, int, uint8_t, void *), void *userdata);
 
-/* Use this function to bootstrap the client.
- * Sends a get nodes request to the given node with ip port and public_key.
- * tox_bootstrap_ex() returns 1 if the address could be converted, 0 otherwise
+/*
+ * Use these two functions to bootstrap the client.
+ */
+/* Sends a "get nodes" request to the given node with ip, port and public_key
+ *   to setup connections
  */
 void tox_bootstrap(Tox *tox, tox_IP_Port ip_port, uint8_t *public_key);
-int tox_bootstrap_ex(Tox *tox, const char *address, uint8_t ipv6enabled,
+/* Resolves address into an IP address. If successful, sends a "get nodes"
+ *   request to the given node with ip, port and public_key to setup connections
+ *
+ * address can be a hostname or an IP address (IPv4 or IPv6).
+ * if ipv6enabled is 0 (zero), the resolving sticks STRICTLY to IPv4 addresses
+ * if ipv6enabled is not 0 (zero), the resolving looks for IPv6 addresses first,
+ *   then IPv4 addresses.
+ * 
+ *  returns 1 if the address could be converted into an IP address
+ *  returns 0 otherwise
+ */
+int tox_bootstrap_from_address(Tox *tox, const char *address, uint8_t ipv6enabled,
                       uint16_t port, uint8_t *public_key);
 
 /*  return 0 if we are not connected to the DHT.
@@ -351,12 +364,27 @@ int tox_bootstrap_ex(Tox *tox, const char *address, uint8_t ipv6enabled,
  */
 int tox_isconnected(Tox *tox);
 
-/* Run this at startup.
+/*
+ *  Run one of the following two functions at startup.
+ */
+/* Initializes a tox structure
+ *  Defaults to using ipv4 connections only.
  *
  *  return allocated instance of tox on success.
  *  return 0 if there are problems.
  */
 Tox *tox_new(void);
+
+/* Initializes a tox structure
+ *  The type of communication socket depends on ipv6enabled:
+ *  If set to 0 (zero), creates an IPv4 socket which subsequently only allows
+ *    IPv4 communication
+ *  If set to anything else, creates an IPv6 socket which allows both IPv4 AND
+ *    IPv6 communication
+ *
+ *  return allocated instance of tox on success.
+ *  return 0 if there are problems.
+ */
 Tox *tox_new_ex(uint8_t ipv6enabled);
 
 /* Run this before closing shop.

toxcore/util.c

@@ -51,7 +51,7 @@ void loginit(uint16_t port)
     if (logfile)
         fclose(logfile);
 
-    sprintf(logbuffer, "%u-%u.log", ntohs(port), now);
+    sprintf(logbuffer, "%u-%u.log", ntohs(port), now());
     logfile = fopen(logbuffer, "w");
 };
 void loglog(char *text)