From 86ba73519848011bacd3cdd690eeaf402af21989 Mon Sep 17 00:00:00 2001
From: irungentoo <irungentoo@gmail.com>
Date: Sat, 25 Jan 2014 21:09:26 -0500
Subject: Improved hole punching a bit.

---
 toxcore/DHT.c  | 23 +++++++++++++++++++++--
 toxcore/DHT.h  |  3 +++
 toxcore/ping.c |  2 +-
 3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/toxcore/DHT.c b/toxcore/DHT.c
index d5808313..65fe6ae0 100644
--- a/toxcore/DHT.c
+++ b/toxcore/DHT.c
@@ -46,11 +46,13 @@
 /* Ping interval in seconds for each random sending of a get nodes request. */
 #define GET_NODE_INTERVAL 5
 
-#define MAX_PUNCHING_PORTS 32
+#define MAX_PUNCHING_PORTS 48
 
 /* Interval in seconds between punching attempts*/
 #define PUNCH_INTERVAL 3
 
+#define MAX_NORMAL_PUNCHING_TRIES 5
+
 #define NAT_PING_REQUEST    0
 #define NAT_PING_RESPONSE   1
 
@@ -1792,8 +1794,23 @@ static void punch_holes(DHT *dht, IP ip, uint16_t *port_list, uint16_t numports,
         ip_copy(&pinging.ip, &ip);
         pinging.port = htons(firstport);
         send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].client_id);
+
+        if (dht->friends_list[friend_num].nat.tries > MAX_NORMAL_PUNCHING_TRIES) {
+            top = dht->friends_list[friend_num].nat.punching_index2 + MAX_PUNCHING_PORTS / 2;
+            uint16_t port1 = 1024;
+            uint16_t port2 = ~0;
+
+            for (i = dht->friends_list[friend_num].nat.punching_index2; i != top; ++i) {
+                pinging.port = htons(port1 + i);
+                send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].client_id);
+                pinging.port = htons(port2 - i);
+                send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].client_id);
+            }
+
+            dht->friends_list[friend_num].nat.punching_index2 = i;
+        }
     } else {
-        for (i = dht->friends_list[friend_num].nat.punching_index; i != top; i++) {
+        for (i = dht->friends_list[friend_num].nat.punching_index; i != top; ++i) {
             /* TODO: Improve port guessing algorithm. */
             uint16_t port = port_list[(i / 2) % numports] + (i / (2 * numports)) * ((i % 2) ? -1 : 1);
             IP_Port pinging;
@@ -1804,6 +1821,8 @@ static void punch_holes(DHT *dht, IP ip, uint16_t *port_list, uint16_t numports,
 
         dht->friends_list[friend_num].nat.punching_index = i;
     }
+
+    ++dht->friends_list[friend_num].nat.tries;
 }
 
 static void do_NAT(DHT *dht)
diff --git a/toxcore/DHT.h b/toxcore/DHT.h
index eb889d5d..b649338a 100644
--- a/toxcore/DHT.h
+++ b/toxcore/DHT.h
@@ -109,6 +109,9 @@ typedef struct {
     /* 1 if currently hole punching, otherwise 0 */
     uint8_t     hole_punching;
     uint32_t    punching_index;
+    uint32_t    tries;
+    uint32_t    punching_index2;
+
     uint64_t    punching_timestamp;
     uint64_t    recvNATping_timestamp;
     uint64_t    NATping_id;
diff --git a/toxcore/ping.c b/toxcore/ping.c
index a37b531d..6b1b906a 100644
--- a/toxcore/ping.c
+++ b/toxcore/ping.c
@@ -35,7 +35,7 @@
 #include "network.h"
 #include "util.h"
 
-#define PING_NUM_MAX 384
+#define PING_NUM_MAX 512
 
 /* Ping newly announced nodes to ping per TIME_TOPING seconds*/
 #define TIME_TOPING 5
-- 
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