Some work done on the messenger part.

core/DHT.c

@@ -756,7 +756,7 @@ int DHT_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
 static uint32_t friend_lastgetnode[MAX_FRIENDS];
 
 
-void doFriends()
+void doDHTFriends()
 {
     uint32_t i, j;
     uint32_t temp_time = unix_time();
@@ -836,7 +836,7 @@ void doClose()//tested
 void doDHT()
 {
     doClose();
-    doFriends();
+    doDHTFriends();
 }
 
 

core/Messenger.c

@@ -10,71 +10,203 @@
 typedef struct
 {
     uint8_t client_id[CLIENT_ID_SIZE];
-    
+    int crypt_connection_id;
+    int friend_request_id; //id of the friend request corresponding to the current friend request to the current friend.
+    uint8_t status;//0 if no friend, 1 if added, 2 if friend request successfully sent, 3 if confirmed friend, 4 if online.
     
 }Friend;
  
+
+uint8_t info[MAX_DATA_SIZE]; //the data that is sent during the friend requests we do
+
+uint16_t info_size; //length of the info
+
 #define MAX_NUM_FRIENDS 256
 
 Friend friendlist[MAX_NUM_FRIENDS];
+
+#define MAX_MESSAGE_LENGTH 256
+
+uint32_t numfriends;
  
 //add a friend
+//client_id is the client i of the friend
 //returns the friend number if success
 //return -1 if failure.
 int m_addfriend(uint8_t * client_id)
 {
     
-    //add friend to the DHT
-    addfriend(uint8_t * client_id);
-    
-    send_friendrequest(uint8_t * public_key, IP_Port ip_port, uint8_t * data, uint32_t length);
+    DHT_addfriend(client_id);
+    friendlist[numfriends].status = 1;
+    friendlist[numfriends].friend_request_id = -1;
+    memcpy(friendlist[numfriends].client_id, client_id, CLIENT_ID_SIZE);
+    numfriends++;
     
+    return numfriends - 1;
 }
 
 //remove a friend
 int m_delfriend(int friendnumber)
-{
-    //delete friend from DHT
-    delfriend(uint8_t * client_id);
-    
+{/*
+    TODO
+    DHT_delfriend(friendlist[friendnumber].client_id);
+*/
 }
 
 
-//return 1 if friend is online
-//return 0 if he is not
-int m_friendonline(int friendnumber)
+//return 4 if friend is online
+//return 3 if friend is confirmed
+//return 2 if the friend request was sent successfully
+//return 1 if the friend was added
+//return 0 if there is no friend with that number.
+int m_friendstatus(int friendnumber)
 {
-    
-    
+    if(friendnumber < 0 || friendnumber >= MAX_NUM_FRIENDS)
+    {
+        return 0;
+    }
+    return friendlist[friendnumber].status;
 }
 
 
-//send a text chat message to a friend.
-int m_sendmessage(int friendnumber)
+//send a text chat message to an online friend.
+//returns 1 if packet was successfully put into the send queue
+//return 0 if it was not.
+int m_sendmessage(int friendnumber, uint8_t * message, uint32_t length)
 {
-    write_cryptpacket(int crypt_connection_id, uint8_t * data, uint32_t length);
+    if(length >= MAX_DATA_SIZE)
+    //this does not mean the maximum message length is MAX_DATA_SIZE - 1, it is actually 17 bytes less.
+    {
+        return 0;   
+    }
+    uint8_t temp[MAX_DATA_SIZE];
+    temp[0] = 64;
+    memcpy(temp + 1, message, length);
+    return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, length + 1);
     
 }
 
+//set the data that will be sent along with friend requests
+//return -1 if failure
+//return 0 if success
+int m_setinfo(uint8_t * data, uint16_t length)
+{
+    if(length == 0 || length > MAX_DATA_SIZE - 1 - crypto_box_PUBLICKEYBYTES - crypto_box_NONCEBYTES)
+    {
+        return -1;
+    }
+    memcpy(info, data, length);
+    info_size = length;
+    return 0;
+}
+
+void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
+
+//set the function that will be executed when a friend request is received.
+int m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
+{
+    friend_request = function;
+}
+
+
+void (*friend_message)(int, uint8_t *, uint16_t);
+
+//set the function that will be executed when a message from a friend is received.
+int m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t))
+{
+    friend_message = function;
+}
+
 
 #define PORT 33445
 //run this at startup
-void initMessenger();
+void initMessenger()
 {
     new_keys();
+    initNetCrypto();
     IP ip;
     ip.i = 0;
     init_networking(ip, PORT);
+    memcpy(self_client_id, self_public_key, crypto_box_PUBLICKEYBYTES);
     
 }
 
+void doFriends()
+{//TODO: add incoming connections and some other stuff.
+    uint32_t i;
+    int len;
+    uint8_t temp[MAX_DATA_SIZE];
+    for(i = 0; i < numfriends; i++)
+    {
+        if(friendlist[i].status == 1)
+        {
+             IP_Port friendip = DHT_getfriendip(friendlist[i].client_id);
+             int request = check_friendrequest(friendlist[i].friend_request_id);
+             //printf("\n%u %u %u\n", friendip.ip.i, request, friendlist[i].friend_request_id);
+             if(friendip.ip.i > 1 && request == -1)
+             {
+                  friendlist[i].friend_request_id = send_friendrequest(friendlist[i].client_id, friendip, info, info_size);
+             }
+             if(request == 1)
+             {
+                  friendlist[i].status = 2;
+             }
+        }
+        if(friendlist[i].status == 2 || friendlist[i].status == 3)
+        {
+            IP_Port friendip = DHT_getfriendip(friendlist[i].client_id);
+            if(is_cryptoconnected(friendlist[i].crypt_connection_id) == 0 && friendip.ip.i > 1)
+            {
+                 friendlist[i].crypt_connection_id = crypto_connect(friendlist[i].client_id, friendip);
+            }
+            if(is_cryptoconnected(friendlist[i].crypt_connection_id) == 3)//if connection is established.
+            {
+                 friendlist[i].status = 4;
+            }
+        }
+        while(friendlist[i].status == 4)
+        {
+            len = read_cryptpacket(friendlist[i].crypt_connection_id, temp);
+            if(len > 0)
+            {
+                 if(temp[0] == 64)
+                 {
+                     (*friend_message)(i, temp, len);
+                 }
+            }
+            else
+            {
+                 if(is_cryptoconnected(friendlist[i].crypt_connection_id) == 4)//if the connection timed out, kill it
+                 {
+                         crypto_kill(friendlist[i].crypt_connection_id);
+                         friendlist[i].status = 3;
+                 }
+                 break;
+            }
+        }
+    }
+}
+
+void doFriendRequest()
+{
+    uint8_t public_key[crypto_box_PUBLICKEYBYTES];
+    uint8_t temp[MAX_DATA_SIZE];
+    
+    int len = handle_friendrequest(public_key, temp);
+    if(len >= 0)
+    {
+        (*friend_request)(public_key, temp, len);
+
+    }
+
+}
 //the main loop that needs to be run at least 200 times per second.
-void doMessenger();
+void doMessenger()
 {
     IP_Port ip_port;
     uint8_t data[MAX_UDP_PACKET_SIZE];
     uint32_t length;
-    while(recievepacket(&ip_port, data, &length) != -1)
+    while(receivepacket(&ip_port, data, &length) != -1)
     {
         //if(rand() % 3 != 1)//simulate packet loss
         //{
@@ -92,4 +224,6 @@ void doMessenger();
     doDHT();
     doLossless_UDP();
     doNetCrypto();
-}
+    doFriendRequest();
+    doFriends();
+}

core/Messenger.h

@@ -23,19 +23,25 @@ int m_delfriend(int friendnumber);
 
 //return 1 if friend is online
 //return 0 if he is not
-int m_friendonline(int friendnumber);
+int m_friendstatus(int friendnumber);
 
 
 //send a text chat message to a friend.
-int m_sendmessage(int friendnumber);
+int m_sendmessage(int friendnumber, uint8_t * message, uint32_t length);
+
+//set the data that will be sent along with friend requests
+//return -1 if failure
+//return 0 if success
+int m_setinfo(uint8_t * data, uint16_t length);
+
+//set the function that will be executed when a friend request is received.
+//function format is function(uint8_t * public_key, uint8_t * data, uint16_t length)
+int m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));
 
 
-//set the function that will be executed when a friend request is recieved.
-int m_callback_friendrequest();
-
-
-//set the function that will be executed when a message from a friend is recieved.
-int m_callback_friendmessage();
+//set the function that will be executed when a message from a friend is received.
+//function format is: function(int friendnumber, uint8_t * message, uint32_t length)
+int m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t));
 
 
 //run this at startup

testing/Messenger_test.c

@@ -0,0 +1,92 @@
+ 
+
+#include "../core/Messenger.h"
+
+#ifdef WIN32
+
+#define c_sleep(x) Sleep(1*x)
+
+#else
+#include <unistd.h>
+#include <arpa/inet.h>
+#define c_sleep(x) usleep(1000*x)
+
+#endif
+
+//horrible function from one of my first C programs.
+//only here because I was too lazy to write a proper one.
+unsigned char * hex_string_to_bin(char hex_string[])
+{
+    unsigned char * val = malloc(strlen(hex_string));
+    char * pos = hex_string;
+    int i=0;
+    while(i < strlen(hex_string))
+    {
+        sscanf(pos,"%2hhx",&val[i]);
+        pos+=2;
+        i++;
+    }
+    return val;
+}
+
+void print_request(uint8_t * public_key, uint8_t * data, uint16_t length)
+{
+    printf("Friend request recieved from: \n");
+    printf("ClientID: ");
+    uint32_t j;
+    for(j = 0; j < 32; j++)
+    {
+        if(public_key[j] < 16)
+            printf("0");
+        printf("%hhX", public_key[j]);
+    }
+    printf("\nOf length: %u with data: %s \n", length, data);
+    
+}
+
+void print_message(int friendnumber, uint8_t * string, uint16_t length)
+{
+    printf("Message with length %u recieved from %u: %s \n", length, friendnumber, string);
+    
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc < 3) {
+        printf("usage %s ip port (of the DHT bootstrap node)\n", argv[0]);
+        exit(0);
+    }
+    initMessenger();
+    m_callback_friendrequest(print_request);
+    m_callback_friendmessage(print_message);
+    
+    m_setinfo("Install Gentoo", sizeof("Install Gentoo"));//The message we send is a message of peace
+    
+    printf("OUR ID: ");
+    uint32_t i;
+    for(i = 0; i < 32; i++)
+    {
+        if(self_public_key[i] < 16)
+            printf("0");
+        printf("%hhX",self_public_key[i]);
+    }
+    
+    char temp_id[128];
+    printf("\nEnter the client_id of the friend you wish to add (32 bytes HEX format):\n");
+    scanf("%s", temp_id);
+    int num = m_addfriend(hex_string_to_bin(temp_id));
+    
+    perror("Initialization");
+    IP_Port bootstrap_ip_port;
+    bootstrap_ip_port.port = htons(atoi(argv[2]));
+    bootstrap_ip_port.ip.i = inet_addr(argv[1]);
+    DHT_bootstrap(bootstrap_ip_port);
+    
+    while(1)
+    {
+        m_sendmessage(num, "Test", 5);
+        doMessenger();
+        c_sleep(1);
+    }
+    
+}