mirror of
https://github.com/irungentoo/toxcore.git
synced 2024-03-22 13:30:51 +08:00
640 lines
18 KiB
C
640 lines
18 KiB
C
/* 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 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;
|
|
}
|
|
|
|
|
|
//copies the public key associated to that friend id into client_id buffer.
|
|
//make sure that client_id is of size CLIENT_ID_SIZE.
|
|
//returns 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
|
|
//returns 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.
|
|
//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)
|
|
{
|
|
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
|
|
static int m_sendname(int friendnumber, uint8_t * name)
|
|
{
|
|
uint8_t temp[MAX_NAME_LENGTH + 1];
|
|
memcpy(temp + 1, name, MAX_NAME_LENGTH);
|
|
temp[0] = PACKET_ID_NICKNAME;
|
|
return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, MAX_NAME_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.
|
|
//return 0 if success
|
|
//return -1 if failure
|
|
int setname(uint8_t * name, uint16_t length)
|
|
{
|
|
if(length > MAX_NAME_LENGTH)
|
|
{
|
|
return -1;
|
|
}
|
|
memcpy(self_name, name, 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);
|
|
|
|
//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))
|
|
{
|
|
friend_request = function;
|
|
}
|
|
|
|
|
|
static void (*friend_message)(int, uint8_t *, uint16_t);
|
|
|
|
//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;
|
|
}
|
|
|
|
|
|
static void (*friend_namechange)(int, uint8_t *, uint16_t);
|
|
void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t))
|
|
{
|
|
friend_namechange = function;
|
|
}
|
|
|
|
static void (*friend_statuschange)(int, uint8_t *, uint16_t);
|
|
void m_callback_userstatus(void (*function)(int, uint8_t *, uint16_t))
|
|
{
|
|
friend_statuschange = function;
|
|
}
|
|
|
|
#define PORT 33445
|
|
//run this at startup
|
|
void initMessenger()
|
|
{
|
|
new_keys();
|
|
m_set_userstatus((uint8_t*)"Online", sizeof("Online"));
|
|
initNetCrypto();
|
|
IP ip;
|
|
ip.i = 0;
|
|
init_networking(ip, PORT);
|
|
}
|
|
|
|
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)
|
|
{
|
|
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, friendlist[i].info, friendlist[i].info_size);
|
|
friendlist[i].status = 2;
|
|
}
|
|
}
|
|
if(friendlist[i].status == 2 || friendlist[i].status == 3) //friend is not online
|
|
{
|
|
check_friendrequest(friendlist[i].friend_request_id);//for now this is used to kill the friend request
|
|
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))
|
|
{
|
|
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) break;
|
|
friend_namechange(i, temp + 1, MAX_NAME_LENGTH); // todo: use the actual length
|
|
memcpy(friendlist[i].name, temp + 1, MAX_NAME_LENGTH);
|
|
friendlist[i].name[MAX_NAME_LENGTH - 1] = 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));
|
|
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: {
|
|
(*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 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);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
//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))
|
|
{
|
|
//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);
|
|
#endif
|
|
|
|
}
|
|
doDHT();
|
|
doLossless_UDP();
|
|
doNetCrypto();
|
|
doInbound();
|
|
doFriendRequest();
|
|
doFriends();
|
|
}
|
|
|
|
//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;
|
|
}
|