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toxcore/core/Messenger.c
Astonex e920be4c01 Fixed the friends listing
2013-07-30 09:21:22 +01:00

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/* Messenger.c
*
* An implementation of a simple text chat only messenger on the tox network core.
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "Messenger.h"
#define MIN(a,b) (((a)<(b))?(a):(b))
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 sent, 3 if confirmed friend, 4 if online. */
uint8_t info[MAX_DATA_SIZE]; /* the data that is sent during the friend requests we do */
uint8_t name[MAX_NAME_LENGTH];
uint8_t name_sent; /* 0 if we didn't send our name to this friend 1 if we have. */
uint8_t *userstatus;
uint16_t userstatus_length;
uint8_t userstatus_sent;
uint16_t info_size; /* length of the info */
} Friend;
uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
static uint8_t self_name[MAX_NAME_LENGTH];
static uint16_t self_name_length;
static uint8_t *self_userstatus;
static uint16_t self_userstatus_len;
#define MAX_NUM_FRIENDS 256
static Friend friendlist[MAX_NUM_FRIENDS];
static uint32_t numfriends;
/* 1 if we are online
0 if we are offline
static uint8_t online; */
/* return the friend id associated to that public key.
return -1 if no such friend */
int getfriend_id(uint8_t *client_id)
{
uint32_t i;
for (i = 0; i < numfriends; ++i) {
if (friendlist[i].status > 0)
if (memcmp(client_id, friendlist[i].client_id, crypto_box_PUBLICKEYBYTES) == 0)
return i;
}
return -1;
}
/* Returns number of friends */
int getnumfriends()
{
return numfriends;
}
/* copies the public key associated to that friend id into client_id buffer.
make sure that client_id is of size CLIENT_ID_SIZE.
return 0 if success
return -1 if failure. */
int getclient_id(int friend_id, uint8_t *client_id)
{
if (friend_id >= numfriends || friend_id < 0)
return -1;
if (friendlist[friend_id].status > 0) {
memcpy(client_id, friendlist[friend_id].client_id, CLIENT_ID_SIZE);
return 0;
}
return -1;
}
/* add a friend
set the data that will be sent along with friend request
client_id is the client id of the friend
data is the data and length is the length
returns the friend number if success
return -1 if failure. */
int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
{
if (length == 0 || length >=
(MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES - crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES + crypto_box_ZEROBYTES))
return -1;
if (memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
return -1;
if (getfriend_id(client_id) != -1)
return -1;
uint32_t i;
for (i = 0; i <= numfriends; ++i) {
if(friendlist[i].status == 0) {
DHT_addfriend(client_id);
friendlist[i].status = 1;
friendlist[i].crypt_connection_id = -1;
friendlist[i].friend_request_id = -1;
memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
friendlist[i].userstatus = calloc(1, 1);
friendlist[i].userstatus_length = 1;
memcpy(friendlist[i].info, data, length);
friendlist[i].info_size = length;
++numfriends;
return i;
}
}
return -1;
}
int m_addfriend_norequest(uint8_t * client_id)
{
if (getfriend_id(client_id) != -1)
return -1;
uint32_t i;
for (i = 0; i <= numfriends; ++i) {
if(friendlist[i].status == 0) {
DHT_addfriend(client_id);
friendlist[i].status = 2;
friendlist[i].crypt_connection_id = -1;
friendlist[i].friend_request_id = -1;
memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
friendlist[i].userstatus = calloc(1, 1);
friendlist[i].userstatus_length = 1;
numfriends++;
return i;
}
}
return -1;
}
/* remove a friend
return 0 if success
return -1 if failure */
int m_delfriend(int friendnumber)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
DHT_delfriend(friendlist[friendnumber].client_id);
crypto_kill(friendlist[friendnumber].crypt_connection_id);
free(friendlist[friendnumber].userstatus);
memset(&friendlist[friendnumber], 0, sizeof(Friend));
uint32_t i;
for (i = numfriends; i != 0; --i) {
if (friendlist[i].status != 0)
break;
}
numfriends = i;
return 0;
}
/* return 4 if friend is online
return 3 if friend is confirmed
return 2 if the friend request was sent
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 an online friend
return 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)
{
if (friendnumber < 0 || friendnumber >= MAX_NUM_FRIENDS)
return 0;
if (length >= MAX_DATA_SIZE || friendlist[friendnumber].status != 4)
/* 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] = PACKET_ID_MESSAGE;
memcpy(temp + 1, message, length);
return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, length + 1);
}
/* send a name packet to friendnumber
length is the length with the NULL terminator*/
static int m_sendname(int friendnumber, uint8_t * name, uint16_t length)
{
if(length > MAX_NAME_LENGTH || length == 0)
return 0;
uint8_t temp[MAX_NAME_LENGTH + 1];
memcpy(temp + 1, name, length);
temp[0] = PACKET_ID_NICKNAME;
return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, length + 1);
}
/* set the name of a friend
return 0 if success
return -1 if failure */
static int setfriendname(int friendnumber, uint8_t * name)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
memcpy(friendlist[friendnumber].name, name, MAX_NAME_LENGTH);
return 0;
}
/* Set our nickname
name must be a string of maximum MAX_NAME_LENGTH length.
length must be at least 1 byte
length is the length of name with the NULL terminator
return 0 if success
return -1 if failure */
int setname(uint8_t * name, uint16_t length)
{
if (length > MAX_NAME_LENGTH || length == 0)
return -1;
memcpy(self_name, name, length);
self_name_length = length;
uint32_t i;
for (i = 0; i < numfriends; ++i)
friendlist[i].name_sent = 0;
return 0;
}
/* get name of friendnumber
put it in name
name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH bytes.
return 0 if success
return -1 if failure */
int getname(int friendnumber, uint8_t * name)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
memcpy(name, friendlist[friendnumber].name, MAX_NAME_LENGTH);
return 0;
}
int m_set_userstatus(uint8_t *status, uint16_t length)
{
if (length > MAX_USERSTATUS_LENGTH)
return -1;
uint8_t *newstatus = calloc(length, 1);
memcpy(newstatus, status, length);
free(self_userstatus);
self_userstatus = newstatus;
self_userstatus_len = length;
uint32_t i;
for (i = 0; i < numfriends; ++i)
friendlist[i].userstatus_sent = 0;
return 0;
}
/* return the size of friendnumber's user status
guaranteed to be at most MAX_USERSTATUS_LENGTH */
int m_get_userstatus_size(int friendnumber)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
return friendlist[friendnumber].userstatus_length;
}
/* copy the user status of friendnumber into buf, truncating if needed to maxlen
bytes, use m_get_userstatus_size to find out how much you need to allocate */
int m_copy_userstatus(int friendnumber, uint8_t * buf, uint32_t maxlen)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
memset(buf, 0, maxlen);
memcpy(buf, friendlist[friendnumber].userstatus, MIN(maxlen, MAX_USERSTATUS_LENGTH) - 1);
return 0;
}
static int send_userstatus(int friendnumber, uint8_t * status, uint16_t length)
{
uint8_t *thepacket = malloc(length + 1);
memcpy(thepacket + 1, status, length);
thepacket[0] = PACKET_ID_USERSTATUS;
int written = write_cryptpacket(friendlist[friendnumber].crypt_connection_id, thepacket, length + 1);
free(thepacket);
return written;
}
static int set_friend_userstatus(int friendnumber, uint8_t * status, uint16_t length)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
uint8_t *newstatus = calloc(length, 1);
memcpy(newstatus, status, length);
free(friendlist[friendnumber].userstatus);
friendlist[friendnumber].userstatus = newstatus;
friendlist[friendnumber].userstatus_length = length;
return 0;
}
/* static void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
static uint8_t friend_request_isset = 0; */
/* set the function that will be executed when a friend request is received. */
void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
{
callback_friendrequest(function);
}
static void (*friend_message)(int, uint8_t *, uint16_t);
static uint8_t friend_message_isset = 0;
/* set the function that will be executed when a message from a friend is received. */
void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t))
{
friend_message = function;
friend_message_isset = 1;
}
static void (*friend_namechange)(int, uint8_t *, uint16_t);
static uint8_t friend_namechange_isset = 0;
void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t))
{
friend_namechange = function;
friend_namechange_isset = 1;
}
static void (*friend_statuschange)(int, uint8_t *, uint16_t);
static uint8_t friend_statuschange_isset = 0;
void m_callback_userstatus(void (*function)(int, uint8_t *, uint16_t))
{
friend_statuschange = function;
friend_statuschange_isset = 1;
}
#define PORT 33445
/* run this at startup */
int initMessenger()
{
new_keys();
m_set_userstatus((uint8_t*)"Online", sizeof("Online"));
initNetCrypto();
IP ip;
ip.i = 0;
if(init_networking(ip,PORT) == -1)
return -1;
return 0;
}
//TODO: make this function not suck.
static 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) {
int fr = send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
if (fr == 0) /* TODO: This needs to be fixed so that it sends the friend requests a couple of times in case of packet loss */
friendlist[i].status = 2;
else if (fr > 0)
friendlist[i].status = 2;
}
if (friendlist[i].status == 2 || friendlist[i].status == 3) { /* friend is not online */
if (friendlist[i].status == 2) {
if (friendlist[i].friend_request_id + 10 < unix_time()) { /*I know this is hackish but it should work.*/
send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
friendlist[i].friend_request_id = unix_time();
}
}
IP_Port friendip = DHT_getfriendip(friendlist[i].client_id);
switch (is_cryptoconnected(friendlist[i].crypt_connection_id)) {
case 0:
if (friendip.ip.i > 1)
friendlist[i].crypt_connection_id = crypto_connect(friendlist[i].client_id, friendip);
break;
case 3: /* Connection is established */
friendlist[i].status = 4;
break;
case 4:
crypto_kill(friendlist[i].crypt_connection_id);
friendlist[i].crypt_connection_id = -1;
break;
default:
break;
}
}
while (friendlist[i].status == 4) { /* friend is online */
if (friendlist[i].name_sent == 0) {
if (m_sendname(i, self_name, self_name_length))
friendlist[i].name_sent = 1;
}
if (friendlist[i].userstatus_sent == 0) {
if (send_userstatus(i, self_userstatus, self_userstatus_len))
friendlist[i].userstatus_sent = 1;
}
len = read_cryptpacket(friendlist[i].crypt_connection_id, temp);
if (len > 0) {
switch (temp[0]) {
case PACKET_ID_NICKNAME: {
if (len >= MAX_NAME_LENGTH + 1 || len == 1)
break;
if(friend_namechange_isset)
friend_namechange(i, temp + 1, len - 1);
memcpy(friendlist[i].name, temp + 1, len - 1);
friendlist[i].name[len - 2] = 0; /* make sure the NULL terminator is present. */
break;
}
case PACKET_ID_USERSTATUS: {
uint8_t *status = calloc(MIN(len - 1, MAX_USERSTATUS_LENGTH), 1);
memcpy(status, temp + 1, MIN(len - 1, MAX_USERSTATUS_LENGTH));
if (friend_statuschange_isset)
friend_statuschange(i, status, MIN(len - 1, MAX_USERSTATUS_LENGTH));
set_friend_userstatus(i, status, MIN(len - 1, MAX_USERSTATUS_LENGTH));
free(status);
break;
}
case PACKET_ID_MESSAGE: {
if (friend_message_isset)
(*friend_message)(i, temp + 1, len - 1);
break;
}
}
} 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].crypt_connection_id = -1;
friendlist[i].status = 3;
}
break;
}
}
}
}
static void doInbound()
{
uint8_t secret_nonce[crypto_box_NONCEBYTES];
uint8_t public_key[crypto_box_PUBLICKEYBYTES];
uint8_t session_key[crypto_box_PUBLICKEYBYTES];
int inconnection = crypto_inbound(public_key, secret_nonce, session_key);
if (inconnection != -1) {
int friend_id = getfriend_id(public_key);
if (friend_id != -1) {
crypto_kill(friendlist[friend_id].crypt_connection_id);
friendlist[friend_id].crypt_connection_id =
accept_crypto_inbound(inconnection, public_key, secret_nonce, session_key);
friendlist[friend_id].status = 3;
}
}
}
/*Interval in seconds between LAN discovery packet sending*/
#define LAN_DISCOVERY_INTERVAL 60
static uint32_t last_LANdiscovery;
/*Send a LAN discovery packet every LAN_DISCOVERY_INTERVAL seconds*/
static void LANdiscovery()
{
if (last_LANdiscovery + LAN_DISCOVERY_INTERVAL < unix_time()) {
send_LANdiscovery(htons(PORT));
last_LANdiscovery = unix_time();
}
}
/* the main loop that needs to be run at least 200 times per second. */
void doMessenger()
{
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
}
doDHT();
doLossless_UDP();
doNetCrypto();
doInbound();
doFriends();
LANdiscovery();
}
/* returns the size of the messenger data (for saving) */
uint32_t Messenger_size()
{
return crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES
+ sizeof(uint32_t) + DHT_size() + sizeof(uint32_t) + sizeof(Friend) * numfriends;
}
/* save the messenger in data of size Messenger_size() */
void Messenger_save(uint8_t *data)
{
save_keys(data);
data += crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
uint32_t size = DHT_size();
memcpy(data, &size, sizeof(size));
data += sizeof(size);
DHT_save(data);
data += size;
size = sizeof(Friend) * numfriends;
memcpy(data, &size, sizeof(size));
data += sizeof(size);
memcpy(data, friendlist, sizeof(Friend) * numfriends);
}
/* load the messenger from data of size length. */
int Messenger_load(uint8_t * data, uint32_t length)
{
if (length == ~0)
return -1;
if (length < crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES + sizeof(uint32_t) * 2)
return -1;
length -= crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES + sizeof(uint32_t) * 2;
load_keys(data);
data += crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
uint32_t size;
memcpy(&size, data, sizeof(size));
data += sizeof(size);
if (length < size)
return -1;
length -= size;
if (DHT_load(data, size) == -1)
return -1;
data += size;
memcpy(&size, data, sizeof(size));
data += sizeof(size);
if (length != size || length % sizeof(Friend) != 0)
return -1;
Friend * temp = malloc(size);
memcpy(temp, data, size);
uint16_t num = size / sizeof(Friend);
uint32_t i;
for (i = 0; i < num; ++i) {
if(temp[i].status != 0) {
int fnum = m_addfriend_norequest(temp[i].client_id);
setfriendname(fnum, temp[i].name);
/* set_friend_userstatus(fnum, temp[i].userstatus, temp[i].userstatus_length); */
}
}
free(temp);
return 0;
}
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