From a6edd9dad6e299f7f5680ff6e846ec6c2213a3db Mon Sep 17 00:00:00 2001
From: irungentoo <irungentoo@gmail.com>
Date: Sat, 26 Oct 2013 17:35:55 -0400
Subject: [PATCH] Base of hardening stuff.

---
 toxcore/DHT.c        | 12 ++++++++++++
 toxcore/DHT.h        | 22 +++++++++++++++++-----
 toxcore/net_crypto.h |  1 +
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/toxcore/DHT.c b/toxcore/DHT.c
index 7c3894b3..661ac98a 100644
--- a/toxcore/DHT.c
+++ b/toxcore/DHT.c
@@ -1552,6 +1552,16 @@ static void do_NAT(DHT *dht)
 /*----------------------------------------------------------------------------------*/
 /*-----------------------END OF NAT PUNCHING FUNCTIONS------------------------------*/
 
+
+/* Handle a received ping request for. */
+static int handle_hardening(void *object, IP_Port source, uint8_t *source_pubkey, uint8_t *packet, uint32_t length)
+{
+    DHT *dht = object;
+    return 0;/* success*/
+}
+
+/*----------------------------------------------------------------------------------*/
+
 DHT *new_DHT(Net_Crypto *c)
 {
     if (c == NULL)
@@ -1575,6 +1585,8 @@ DHT *new_DHT(Net_Crypto *c)
     networking_registerhandler(c->lossless_udp->net, NET_PACKET_SEND_NODES_IPV6, &handle_sendnodes_ipv6, dht);
     init_cryptopackets(dht);
     cryptopacket_registerhandler(c, CRYPTO_PACKET_NAT_PING, &handle_NATping, dht);
+    cryptopacket_registerhandler(c, CRYPTO_PACKET_HARDENING, &handle_hardening, dht);
+
     new_symmetric_key(dht->secret_symmetric_key);
     return dht;
 }
diff --git a/toxcore/DHT.h b/toxcore/DHT.h
index b60f744b..b3ab5f89 100644
--- a/toxcore/DHT.h
+++ b/toxcore/DHT.h
@@ -35,11 +35,6 @@
 /* A list of the clients mathematically closest to ours. */
 #define LCLIENT_LIST 32
 
-/* The list of ip ports along with the ping_id of what we sent them and a timestamp. */
-#define LPING_ARRAY 256 // NOTE: Deprecated (doesn't do anything).
-
-#define LSEND_NODES_ARRAY LPING_ARRAY/2
-
 /* Maximum newly announced nodes to ping per TIME_TOPING seconds. */
 #define MAX_TOPING 16
 
@@ -76,6 +71,21 @@ typedef struct {
     uint64_t    NATping_timestamp;
 } NAT;
 
+typedef struct {
+    /* Node routes request correctly (true (1) or false/didn't check (0)) */
+    uint8_t     routes_requests_ok;
+    /* Time which we last checked this.*/
+    uint64_t    routes_requests_timestamp;
+    /* Node sends correct send_node (true (1) or false/didn't check (0)) */
+    uint8_t     send_nodes_ok;
+    /* Time which we last checked this.*/
+    uint64_t    send_nodes_timestamp;
+    /* Node can be used to test other nodes (true (1) or false/didn't check (0)) */
+    uint8_t     testing_requests;
+    /* Time which we last checked this.*/
+    uint64_t    testing_timestamp;
+} Hardening;
+
 typedef struct {
     uint8_t     client_id[CLIENT_ID_SIZE];
     Client_data_old client_list[MAX_FRIEND_CLIENTS];
@@ -83,6 +93,7 @@ typedef struct {
     /* Time at which the last get_nodes request was sent. */
     uint64_t    lastgetnode;
 
+    Hardening hardening;
     /* Symetric NAT hole punching stuff. */
     NAT         nat;
 } DHT_Friend_old;  /* required to load old state files */
@@ -94,6 +105,7 @@ typedef struct {
     /* Time at which the last get_nodes request was sent. */
     uint64_t    lastgetnode;
 
+    Hardening hardening;
     /* Symetric NAT hole punching stuff. */
     NAT         nat;
 } DHT_Friend;
diff --git a/toxcore/net_crypto.h b/toxcore/net_crypto.h
index f44bae6c..38400ebc 100644
--- a/toxcore/net_crypto.h
+++ b/toxcore/net_crypto.h
@@ -27,6 +27,7 @@
 #include "Lossless_UDP.h"
 
 #define CRYPTO_PACKET_FRIEND_REQ    32  /* Friend request crypto packet ID. */
+#define CRYPTO_PACKET_HARDENING     48  /* Hardening crypto packet ID. */
 #define CRYPTO_PACKET_NAT_PING      254 /* NAT ping crypto packet ID. */
 #define CRYPTO_HANDSHAKE_TIMEOUT (CONNECTION_TIMEOUT * 2)