Merge pull request #415 from slvr/pr

Beginning to centralise packet handling

13 files changed, 78 insertions, 102 deletions

diff --git a/core/DHT.c b/core/DHT.c
index 7e3af9d2..d359076d 100644
--- a/core/DHT.c
+++ b/core/DHT.c
@@ -554,7 +554,7 @@ static int sendnodes(IP_Port ip_port, uint8_t * public_key, uint8_t * client_id,
     return sendpacket(ip_port, data, 1 + CLIENT_ID_SIZE + crypto_box_NONCEBYTES + len);
 }
 
-static int handle_getnodes(uint8_t * packet, uint32_t length, IP_Port source)
+static int handle_getnodes(IP_Port source, uint8_t * packet, uint32_t length)
 {
     uint64_t ping_id;
 
@@ -586,7 +586,7 @@ static int handle_getnodes(uint8_t * packet, uint32_t length, IP_Port source)
     return 0;
 }
 
-static int handle_sendnodes(uint8_t * packet, uint32_t length, IP_Port source)
+static int handle_sendnodes(IP_Port source, uint8_t * packet, uint32_t length)
 {
     uint64_t ping_id;
     uint32_t cid_size = 1 + CLIENT_ID_SIZE;
@@ -930,7 +930,7 @@ static int send_NATping(uint8_t * public_key, uint64_t ping_id, uint8_t type)
 }
 
 /* Handle a received ping request for */
-static int handle_NATping(uint8_t * packet, uint32_t length, IP_Port source)
+static int handle_NATping(IP_Port source, uint8_t * packet, uint32_t length) 
 {
     if (length < crypto_box_PUBLICKEYBYTES * 2 + crypto_box_NONCEBYTES + ENCRYPTION_PADDING 
             || length > MAX_DATA_SIZE + ENCRYPTION_PADDING)
@@ -1074,30 +1074,13 @@ static void doNAT(void)
 /*----------------------------------------------------------------------------------*/
 /*-----------------------END OF NAT PUNCHING FUNCTIONS------------------------------*/
 
-int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
+void DHT_init(void)
 {
-    switch (packet[0]) {
-    case 0:
-        return handle_ping_request(packet, length, source);
-
-    case 1:
-        return handle_ping_response(packet, length, source);
-
-    case 2:
-        return handle_getnodes(packet, length, source);
-
-    case 3:
-        return handle_sendnodes(packet, length, source);
-
-    case 254:
-        return handle_NATping(packet, length, source);
-
-    default:
-        return 1;
-
-    }
-
-    return 0;
+    networking_registerhandler(0, &handle_ping_request);
+    networking_registerhandler(1, &handle_ping_response);
+    networking_registerhandler(2, &handle_getnodes);
+    networking_registerhandler(3, &handle_sendnodes);
+    networking_registerhandler(254, &handle_NATping);
 }
 
 void doDHT(void)
diff --git a/core/DHT.h b/core/DHT.h
index cb5697ea..0e05f132 100644
--- a/core/DHT.h
+++ b/core/DHT.h
@@ -58,11 +58,6 @@ IP_Port DHT_getfriendip(uint8_t *client_id);
 /* Run this function at least a couple times per second (It's the main loop) */
 void doDHT(void);
 
-/* if we receive a DHT packet we call this function so it can be handled.
-    return 0 if packet is handled correctly.
-    return 1 if it didn't handle the packet or if the packet was shit. */
-int DHT_handlepacket(uint8_t *packet, uint32_t length, IP_Port source);
-
 /* Use this function to bootstrap the client
     Sends a get nodes request to the given node with ip port and public_key */
 void DHT_bootstrap(IP_Port ip_port, uint8_t *public_key);
@@ -93,6 +88,9 @@ uint32_t DHT_size(void);
 /* save the DHT in data where data is an array of size DHT_size() */
 void DHT_save(uint8_t *data);
 
+/* init DHT */
+void DHT_init(void);
+
 /* load the DHT from data of size size;
     return -1 if failure
     return 0 if success */
diff --git a/core/LAN_discovery.c b/core/LAN_discovery.c
index 26b3930c..67dc656b 100644
--- a/core/LAN_discovery.c
+++ b/core/LAN_discovery.c
@@ -111,7 +111,7 @@ static int LAN_ip(IP ip)
     return -1;
 }
 
-static int handle_LANdiscovery(uint8_t *packet, uint32_t length, IP_Port source)
+static int handle_LANdiscovery(IP_Port source, uint8_t *packet, uint32_t length)
 {
     if (LAN_ip(source.ip) == -1)
         return 1;
@@ -125,16 +125,14 @@ static int handle_LANdiscovery(uint8_t *packet, uint32_t length, IP_Port source)
 int send_LANdiscovery(uint16_t port)
 {
     uint8_t data[crypto_box_PUBLICKEYBYTES + 1];
-    data[0] = 32;
+    data[0] = 33;
     memcpy(data + 1, self_public_key, crypto_box_PUBLICKEYBYTES);
     IP_Port ip_port = {broadcast_ip(), port};
     return sendpacket(ip_port, data, 1 + crypto_box_PUBLICKEYBYTES);
 }
 
 
-int LANdiscovery_handlepacket(uint8_t *packet, uint32_t length, IP_Port source)
+void LANdiscovery_init(void)
 {
-    if (packet[0] == 32)
-        return handle_LANdiscovery(packet, length, source);
-    return 1;
+    networking_registerhandler(33, &handle_LANdiscovery);
 }
diff --git a/core/LAN_discovery.h b/core/LAN_discovery.h
index 96a6e6ad..6b5b8c75 100644
--- a/core/LAN_discovery.h
+++ b/core/LAN_discovery.h
@@ -43,10 +43,8 @@ extern "C" {
 int send_LANdiscovery(uint16_t port);
 
 
-/* if we receive a packet we call this function so it can be handled.
-    return 0 if packet is handled correctly.
-    return 1 if it didn't handle the packet or if the packet was shit. */
-int LANdiscovery_handlepacket(uint8_t *packet, uint32_t length, IP_Port source);
+/* sets up packet handlers */
+void LANdiscovery_init(void);
 
 
 
diff --git a/core/Lossless_UDP.c b/core/Lossless_UDP.c
index 3a289735..002e2cf8 100644
--- a/core/Lossless_UDP.c
+++ b/core/Lossless_UDP.c
@@ -555,7 +555,7 @@ static int send_DATA(uint32_t connection_id)
 
 
 /* Return 0 if handled correctly, 1 if packet is bad. */
-static int handle_handshake(uint8_t * packet, uint32_t length, IP_Port source)
+static int handle_handshake(IP_Port source, uint8_t * packet, uint32_t length)
 {
     if (length != (1 + 4 + 4))
         return 1;
@@ -669,7 +669,7 @@ static int handle_SYNC3(int connection_id, uint8_t counter, uint32_t recv_packet
     return 1;
 }
 
-static int handle_SYNC(uint8_t *packet, uint32_t length, IP_Port source)
+static int handle_SYNC(IP_Port source, uint8_t *packet, uint32_t length)
 {
 
     if (!SYNC_valid(length))
@@ -742,7 +742,7 @@ static int add_recv(int connection_id, uint32_t data_num, uint8_t *data, uint16_
     return 0;
 }
 
-static int handle_data(uint8_t *packet, uint32_t length, IP_Port source)
+static int handle_data(IP_Port source, uint8_t *packet, uint32_t length)
 {
     int connection = getconnection_id(source);
 
@@ -770,23 +770,11 @@ static int handle_data(uint8_t *packet, uint32_t length, IP_Port source)
  * END of packet handling functions 
  */
 
-int LosslessUDP_handlepacket(uint8_t *packet, uint32_t length, IP_Port source)
+void LosslessUDP_init(void)
 {
-    switch (packet[0]) {
-    case 16:
-        return handle_handshake(packet, length, source);
-
-    case 17:
-        return handle_SYNC(packet, length, source);
-
-    case 18:
-        return handle_data(packet, length, source);
-
-    default:
-        return 1;
-    }
-
-    return 0;
+    networking_registerhandler(16, &handle_handshake);
+    networking_registerhandler(17, &handle_SYNC);
+    networking_registerhandler(18, &handle_data);
 }
 
 /*
diff --git a/core/Lossless_UDP.h b/core/Lossless_UDP.h
index b4cb186a..53afe606 100644
--- a/core/Lossless_UDP.h
+++ b/core/Lossless_UDP.h
@@ -113,11 +113,9 @@ int is_connected(int connection_id);
 void doLossless_UDP(void);
 
 /* 
- * If we receive a Lossless_UDP packet, call this function so it can be handled.
- * Return 0 if packet is handled correctly.
- * Return 1 if it didn't handle the packet or if the packet was shit.
+ * This function sets up LosslessUDP packet handling.
  */
-int LosslessUDP_handlepacket(uint8_t *packet, uint32_t length, IP_Port source);
+void LosslessUDP_init(void);
 
 #ifdef __cplusplus
 }
diff --git a/core/Messenger.c b/core/Messenger.c
index dd651107..37ab5e2d 100644
--- a/core/Messenger.c
+++ b/core/Messenger.c
@@ -518,6 +518,11 @@ int initMessenger(void)
     if(init_networking(ip,PORT) == -1)
         return -1;
 
+    DHT_init();
+    LosslessUDP_init();
+    friendreq_init();
+    LANdiscovery_init();
+
     return 0;
 }
 
@@ -684,29 +689,8 @@ static void LANdiscovery(void)
 /* the main loop that needs to be run at least 200 times per second. */
 void doMessenger(void)
 {
-    IP_Port ip_port;
-    uint8_t data[MAX_UDP_PACKET_SIZE];
-    uint32_t length;
-    while (receivepacket(&ip_port, data, &length) != -1) {
-#ifdef DEBUG
-        /* if(rand() % 3 != 1) //simulate packet loss */
-        /* { */
-        if (DHT_handlepacket(data, length, ip_port) && LosslessUDP_handlepacket(data, length, ip_port) &&
-            friendreq_handlepacket(data, length, ip_port) && LANdiscovery_handlepacket(data, length, ip_port))
-            /* if packet is discarded */
-            printf("Received unhandled packet with length: %u\n", length);
-        else
-            printf("Received handled packet with length: %u\n", length);
-        /* } */
-        printf("Status: %u %u %u\n",friendlist[0].status ,is_cryptoconnected(friendlist[0].crypt_connection_id),  friendlist[0].crypt_connection_id);
-#else
-        DHT_handlepacket(data, length, ip_port);
-        LosslessUDP_handlepacket(data, length, ip_port);
-        friendreq_handlepacket(data, length, ip_port);
-        LANdiscovery_handlepacket(data, length, ip_port);
-#endif
-
-    }
+    networking_poll();
+        
     doDHT();
     doLossless_UDP();
     doNetCrypto();
diff --git a/core/friend_requests.c b/core/friend_requests.c
index b8dab87e..422cc028 100644
--- a/core/friend_requests.c
+++ b/core/friend_requests.c
@@ -101,7 +101,7 @@ static int request_received(uint8_t * client_id)
 }
 
 
-int friendreq_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
+static int friendreq_handlepacket(IP_Port source, uint8_t * packet, uint32_t length)
 {
     if (packet[0] == 32) {
         if (length <= crypto_box_PUBLICKEYBYTES * 2 + crypto_box_NONCEBYTES + 1 + ENCRYPTION_PADDING ||
@@ -129,3 +129,8 @@ int friendreq_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
     }
     return 1;
 }
+
+void friendreq_init(void)
+{
+    networking_registerhandler(32, &friendreq_handlepacket);
+}
diff --git a/core/friend_requests.h b/core/friend_requests.h
index 4dfc5130..708d8f66 100644
--- a/core/friend_requests.h
+++ b/core/friend_requests.h
@@ -39,10 +39,8 @@ int send_friendrequest(uint8_t *public_key, uint8_t *data, uint32_t length);
     function format is function(uint8_t * public_key, uint8_t * data, uint16_t length) */
 void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));
 
-/* if we receive a packet we call this function so it can be handled.
-    return 0 if packet is handled correctly.
-    return 1 if it didn't handle the packet or if the packet was shit. */
-int friendreq_handlepacket(uint8_t *packet, uint32_t length, IP_Port source);
+/* sets up friendreq packet handlers */
+void friendreq_init(void);
 
 #ifdef __cplusplus
 }
diff --git a/core/network.c b/core/network.c
index 8c6fa7b6..7e3b344a 100644
--- a/core/network.c
+++ b/core/network.c
@@ -71,7 +71,7 @@ int sendpacket(IP_Port ip_port, uint8_t * data, uint32_t length)
    the packet data into data
    the packet length into length.
    dump all empty packets. */
-int receivepacket(IP_Port * ip_port, uint8_t * data, uint32_t * length)
+static int receivepacket(IP_Port * ip_port, uint8_t * data, uint32_t * length)
 {
     ADDR addr;
 #ifdef WIN32
@@ -88,6 +88,27 @@ int receivepacket(IP_Port * ip_port, uint8_t * data, uint32_t * length)
     return 0;
 }
 
+static packet_handler_callback packethandlers[256] = {0};
+
+void networking_registerhandler(uint8_t byte, packet_handler_callback cb)
+{
+    packethandlers[byte] = cb;
+}
+
+void networking_poll()
+{
+    IP_Port ip_port;
+    uint8_t data[MAX_UDP_PACKET_SIZE];
+    uint32_t length;
+    
+    while (receivepacket(&ip_port, data, &length) != -1)
+    {
+        if (length < 1) continue;
+        if (!packethandlers[data[0]]) continue;
+        packethandlers[data[0]](ip_port, data, length);
+    }
+}
+
 /* initialize networking
    bind to ip and port
    ip must be in network order EX: 127.0.0.1 = (7F000001)
@@ -149,7 +170,6 @@ int init_networking(IP ip, uint16_t port)
     bind(sock, (struct sockaddr*)&addr, sizeof(addr));
 
     return 0;
-
 }
 
 /* function to cleanup networking stuff */
diff --git a/core/network.h b/core/network.h
index d3c39333..7c95d84d 100644
--- a/core/network.h
+++ b/core/network.h
@@ -94,6 +94,11 @@ typedef struct {
 #endif
 } ADDR;
 
+/* Function to receive data, ip and port of sender is put into ip_port
+    the packet data into data
+    the packet length into length. */
+typedef int (*packet_handler_callback)(IP_Port ip_port, uint8_t *data, uint32_t len);
+
 /* returns current time in milleseconds since the epoch. */
 uint64_t current_time(void);
 
@@ -106,10 +111,11 @@ uint32_t random_int(void);
 /* Function to send packet(data) of length length to ip_port */
 int sendpacket(IP_Port ip_port, uint8_t *data, uint32_t length);
 
-/* Function to receive data, ip and port of sender is put into ip_port
-    the packet data into data
-    the packet length into length. */
-int receivepacket(IP_Port *ip_port, uint8_t *data, uint32_t *length);
+/* Function to call when packet beginning with byte is received */
+void networking_registerhandler(uint8_t byte, packet_handler_callback cb);
+
+/* call this several times a second */
+void networking_poll();
 
 /* initialize networking
     bind to ip and port
diff --git a/core/ping.c b/core/ping.c
index 6a1fbb7e..24ece06a 100644
--- a/core/ping.c
+++ b/core/ping.c
@@ -163,7 +163,7 @@ int send_ping_response(IP_Port ipp, clientid_t* client_id, uint64_t ping_id)
     return sendpacket(ipp, (uint8_t*) &pk, sizeof(pk));
 }
 
-int handle_ping_request(uint8_t* packet, uint32_t length, IP_Port source)
+int handle_ping_request(IP_Port source, uint8_t* packet, uint32_t length)
 {
     pingreq_t* p = (pingreq_t*) packet;
     int        rc;
@@ -190,7 +190,7 @@ int handle_ping_request(uint8_t* packet, uint32_t length, IP_Port source)
     return 0;
 }
 
-int handle_ping_response(uint8_t* packet, uint32_t length, IP_Port source)
+int handle_ping_response(IP_Port source, uint8_t* packet, uint32_t length)
 {
     pingres_t* p = (pingres_t*) packet;
     int       rc;
diff --git a/core/ping.h b/core/ping.h
index 2cab7d59..1ccfabac 100644
--- a/core/ping.h
+++ b/core/ping.h
@@ -12,5 +12,5 @@ uint64_t add_ping(IP_Port ipp);
 bool is_pinging(IP_Port ipp, uint64_t ping_id);
 int send_ping_request(IP_Port ipp, clientid_t* client_id);
 int send_ping_response(IP_Port ipp, clientid_t* client_id, uint64_t ping_id);
-int handle_ping_request(uint8_t* packet, uint32_t length, IP_Port source);
-int handle_ping_response(uint8_t* packet, uint32_t length, IP_Port source);
+int handle_ping_request(IP_Port source, uint8_t* packet, uint32_t length);
+int handle_ping_response(IP_Port source, uint8_t* packet, uint32_t length);