mirror of
https://github.com/irungentoo/toxcore.git
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664 lines
20 KiB
C
664 lines
20 KiB
C
/* Messenger.c
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*
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* An implementation of a simple text chat only messenger on the tox network core.
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*
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* Copyright (C) 2013 Tox project All Rights Reserved.
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*
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* This file is part of Tox.
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*
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* Tox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Tox is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "Messenger.h"
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#define MIN(a,b) (((a)<(b))?(a):(b))
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typedef struct
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{
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uint8_t client_id[CLIENT_ID_SIZE];
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int crypt_connection_id;
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int friend_request_id; /* id of the friend request corresponding to the current friend request to the current friend. */
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uint8_t status; /* 0 if no friend, 1 if added, 2 if friend request sent, 3 if confirmed friend, 4 if online. */
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uint8_t info[MAX_DATA_SIZE]; /* the data that is sent during the friend requests we do */
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uint8_t name[MAX_NAME_LENGTH];
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uint8_t name_sent; /* 0 if we didn't send our name to this friend 1 if we have. */
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uint8_t *userstatus;
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uint16_t userstatus_length;
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uint8_t userstatus_sent;
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uint16_t info_size; /* length of the info */
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}Friend;
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uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
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static uint8_t self_name[MAX_NAME_LENGTH];
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static uint8_t *self_userstatus;
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static uint16_t self_userstatus_len;
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#define MAX_NUM_FRIENDS 256
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static Friend friendlist[MAX_NUM_FRIENDS];
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static uint32_t numfriends;
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/* 1 if we are online
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0 if we are offline
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static uint8_t online; */
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/* return the friend id associated to that public key.
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return -1 if no such friend */
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int getfriend_id(uint8_t * client_id)
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{
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uint32_t i;
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for(i = 0; i < numfriends; ++i)
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{
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if(friendlist[i].status > 0)
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{
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if(memcmp(client_id, friendlist[i].client_id, crypto_box_PUBLICKEYBYTES) == 0)
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{
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return i;
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}
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}
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}
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return -1;
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}
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/* copies the public key associated to that friend id into client_id buffer.
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make sure that client_id is of size CLIENT_ID_SIZE.
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return 0 if success
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return -1 if failure. */
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int getclient_id(int friend_id, uint8_t * client_id)
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{
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if(friend_id >= numfriends || friend_id < 0)
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{
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return -1;
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}
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if(friendlist[friend_id].status > 0)
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{
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memcpy(client_id, friendlist[friend_id].client_id, CLIENT_ID_SIZE);
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return 0;
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}
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return -1;
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}
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/* add a friend
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set the data that will be sent along with friend request
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client_id is the client id of the friend
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data is the data and length is the length
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returns the friend number if success
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return -1 if failure. */
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int m_addfriend(uint8_t * client_id, uint8_t * data, uint16_t length)
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{
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if(length == 0 || length >=
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(MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES - crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES + crypto_box_ZEROBYTES))
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{
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return -1;
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}
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if(memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
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{
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return -1;
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}
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if(getfriend_id(client_id) != -1)
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{
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return -1;
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}
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uint32_t i;
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for(i = 0; i <= numfriends; ++i)
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{
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if(friendlist[i].status == 0)
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{
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DHT_addfriend(client_id);
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friendlist[i].status = 1;
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friendlist[i].crypt_connection_id = -1;
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friendlist[i].friend_request_id = -1;
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memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
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friendlist[i].userstatus = calloc(1, 1);
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friendlist[i].userstatus_length = 1;
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memcpy(friendlist[i].info, data, length);
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friendlist[i].info_size = length;
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++numfriends;
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return i;
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}
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}
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return -1;
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}
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int m_addfriend_norequest(uint8_t * client_id)
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{
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if(getfriend_id(client_id) != -1)
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{
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return -1;
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}
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uint32_t i;
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for(i = 0; i <= numfriends; ++i)
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{
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if(friendlist[i].status == 0)
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{
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DHT_addfriend(client_id);
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friendlist[i].status = 2;
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friendlist[i].crypt_connection_id = -1;
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friendlist[i].friend_request_id = -1;
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memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
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friendlist[i].userstatus = calloc(1, 1);
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friendlist[i].userstatus_length = 1;
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numfriends++;
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return i;
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}
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}
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return -1;
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}
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/* remove a friend
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return 0 if success
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return -1 if failure */
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int m_delfriend(int friendnumber)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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DHT_delfriend(friendlist[friendnumber].client_id);
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crypto_kill(friendlist[friendnumber].crypt_connection_id);
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free(friendlist[friendnumber].userstatus);
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memset(&friendlist[friendnumber], 0, sizeof(Friend));
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uint32_t i;
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for(i = numfriends; i != 0; --i)
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{
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if(friendlist[i].status != 0)
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{
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break;
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}
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}
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numfriends = i;
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return 0;
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}
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/* return 4 if friend is online
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return 3 if friend is confirmed
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return 2 if the friend request was sent
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return 1 if the friend was added
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return 0 if there is no friend with that number */
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int m_friendstatus(int friendnumber)
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{
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if(friendnumber < 0 || friendnumber >= MAX_NUM_FRIENDS)
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{
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return 0;
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}
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return friendlist[friendnumber].status;
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}
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/* send a text chat message to an online friend
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return 1 if packet was successfully put into the send queue
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return 0 if it was not */
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int m_sendmessage(int friendnumber, uint8_t * message, uint32_t length)
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{
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if(friendnumber < 0 || friendnumber >= MAX_NUM_FRIENDS)
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{
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return 0;
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}
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if(length >= MAX_DATA_SIZE || friendlist[friendnumber].status != 4)
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/* this does not mean the maximum message length is MAX_DATA_SIZE - 1, it is actually 17 bytes less. */
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{
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return 0;
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}
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uint8_t temp[MAX_DATA_SIZE];
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temp[0] = PACKET_ID_MESSAGE;
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memcpy(temp + 1, message, length);
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return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, length + 1);
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}
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/* send a name packet to friendnumber */
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static int m_sendname(int friendnumber, uint8_t * name)
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{
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uint8_t temp[MAX_NAME_LENGTH + 1];
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memcpy(temp + 1, name, MAX_NAME_LENGTH);
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temp[0] = PACKET_ID_NICKNAME;
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return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, temp, MAX_NAME_LENGTH + 1);
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}
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/* set the name of a friend
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return 0 if success
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return -1 if failure */
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static int setfriendname(int friendnumber, uint8_t * name)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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memcpy(friendlist[friendnumber].name, name, MAX_NAME_LENGTH);
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return 0;
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}
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/* Set our nickname
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name must be a string of maximum MAX_NAME_LENGTH length.
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return 0 if success
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return -1 if failure */
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int setname(uint8_t * name, uint16_t length)
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{
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if(length > MAX_NAME_LENGTH)
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{
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return -1;
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}
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memcpy(self_name, name, length);
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uint32_t i;
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for(i = 0; i < numfriends; ++i)
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{
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friendlist[i].name_sent = 0;
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}
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return 0;
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}
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/* get name of friendnumber
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put it in name
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name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH bytes.
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return 0 if success
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return -1 if failure */
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int getname(int friendnumber, uint8_t * name)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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memcpy(name, friendlist[friendnumber].name, MAX_NAME_LENGTH);
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return 0;
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}
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int m_set_userstatus(uint8_t *status, uint16_t length)
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{
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if(length > MAX_USERSTATUS_LENGTH)
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{
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return -1;
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}
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uint8_t *newstatus = calloc(length, 1);
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memcpy(newstatus, status, length);
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free(self_userstatus);
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self_userstatus = newstatus;
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self_userstatus_len = length;
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uint32_t i;
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for(i = 0; i < numfriends; ++i)
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{
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friendlist[i].userstatus_sent = 0;
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}
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return 0;
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}
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/* return the size of friendnumber's user status
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guaranteed to be at most MAX_USERSTATUS_LENGTH */
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int m_get_userstatus_size(int friendnumber)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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return friendlist[friendnumber].userstatus_length;
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}
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/* copy the user status of friendnumber into buf, truncating if needed to maxlen
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bytes, use m_get_userstatus_size to find out how much you need to allocate */
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int m_copy_userstatus(int friendnumber, uint8_t * buf, uint32_t maxlen)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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memset(buf, 0, maxlen);
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memcpy(buf, friendlist[friendnumber].userstatus, MIN(maxlen, MAX_USERSTATUS_LENGTH) - 1);
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return 0;
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}
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static int send_userstatus(int friendnumber, uint8_t * status, uint16_t length)
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{
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uint8_t *thepacket = malloc(length + 1);
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memcpy(thepacket + 1, status, length);
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thepacket[0] = PACKET_ID_USERSTATUS;
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int written = write_cryptpacket(friendlist[friendnumber].crypt_connection_id, thepacket, length + 1);
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free(thepacket);
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return written;
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}
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static int set_friend_userstatus(int friendnumber, uint8_t * status, uint16_t length)
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{
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if(friendnumber >= numfriends || friendnumber < 0)
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{
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return -1;
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}
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uint8_t *newstatus = calloc(length, 1);
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memcpy(newstatus, status, length);
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free(friendlist[friendnumber].userstatus);
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friendlist[friendnumber].userstatus = newstatus;
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friendlist[friendnumber].userstatus_length = length;
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return 0;
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}
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/*
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static void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
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static uint8_t friend_request_isset = 0;
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*/
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/* set the function that will be executed when a friend request is received. */
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void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
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{
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callback_friendrequest(function);
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}
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static void (*friend_message)(int, uint8_t *, uint16_t);
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static uint8_t friend_message_isset = 0;
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/* set the function that will be executed when a message from a friend is received. */
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void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t))
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{
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friend_message = function;
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friend_message_isset = 1;
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}
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static void (*friend_namechange)(int, uint8_t *, uint16_t);
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static uint8_t friend_namechange_isset = 0;
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void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t))
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{
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friend_namechange = function;
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friend_namechange_isset = 1;
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}
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static void (*friend_statuschange)(int, uint8_t *, uint16_t);
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static uint8_t friend_statuschange_isset = 0;
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void m_callback_userstatus(void (*function)(int, uint8_t *, uint16_t))
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{
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friend_statuschange = function;
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friend_statuschange_isset = 1;
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}
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#define PORT 33445
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/* run this at startup */
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int initMessenger()
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{
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new_keys();
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m_set_userstatus((uint8_t*)"Online", sizeof("Online"));
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initNetCrypto();
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IP ip;
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ip.i = 0;
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if(init_networking(ip,PORT) == -1)
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return -1;
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return 0;
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}
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static void doFriends()
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{/* TODO: add incoming connections and some other stuff. */
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uint32_t i;
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int len;
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uint8_t temp[MAX_DATA_SIZE];
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for(i = 0; i < numfriends; ++i)
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{
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if(friendlist[i].status == 1)
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{
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int fr = send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
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if(fr == 0)/*TODO: This needs to be fixed so that it sends the friend requests a couple of times in case
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of packet loss*/
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{
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friendlist[i].status = 2;
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}
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else
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if(fr > 0)
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{
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friendlist[i].status = 2;
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}
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}
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if(friendlist[i].status == 2 || friendlist[i].status == 3) /* friend is not online */
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{
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if(friendlist[i].status == 2)
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{
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if(friendlist[i].friend_request_id + 10 < unix_time()) /*I know this is hackish but it should work.*/
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{
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send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
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friendlist[i].friend_request_id = unix_time();
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}
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}
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IP_Port friendip = DHT_getfriendip(friendlist[i].client_id);
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switch(is_cryptoconnected(friendlist[i].crypt_connection_id))
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{
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case 0:
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if (friendip.ip.i > 1)
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friendlist[i].crypt_connection_id = crypto_connect(friendlist[i].client_id, friendip);
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break;
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case 3: /* Connection is established */
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friendlist[i].status = 4;
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break;
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case 4:
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crypto_kill(friendlist[i].crypt_connection_id);
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friendlist[i].crypt_connection_id = -1;
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break;
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default:
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break;
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}
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}
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while(friendlist[i].status == 4) /* friend is online */
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{
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if(friendlist[i].name_sent == 0)
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{
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if(m_sendname(i, self_name))
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{
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friendlist[i].name_sent = 1;
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}
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}
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if(friendlist[i].userstatus_sent == 0)
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{
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if(send_userstatus(i, self_userstatus, self_userstatus_len))
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{
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friendlist[i].userstatus_sent = 1;
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}
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}
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len = read_cryptpacket(friendlist[i].crypt_connection_id, temp);
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if(len > 0)
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{
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switch(temp[0]) {
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case PACKET_ID_NICKNAME: {
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if (len != MAX_NAME_LENGTH + 1) break;
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if(friend_namechange_isset)
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{
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friend_namechange(i, temp + 1, MAX_NAME_LENGTH); /* TODO: use the actual length */
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}
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memcpy(friendlist[i].name, temp + 1, MAX_NAME_LENGTH);
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friendlist[i].name[MAX_NAME_LENGTH - 1] = 0; /* make sure the NULL terminator is present. */
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break;
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}
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case PACKET_ID_USERSTATUS: {
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uint8_t *status = calloc(MIN(len - 1, MAX_USERSTATUS_LENGTH), 1);
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memcpy(status, temp + 1, MIN(len - 1, MAX_USERSTATUS_LENGTH));
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if(friend_statuschange_isset)
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{
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friend_statuschange(i, status, MIN(len - 1, MAX_USERSTATUS_LENGTH));
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}
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set_friend_userstatus(i, status, MIN(len - 1, MAX_USERSTATUS_LENGTH));
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free(status);
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break;
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}
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case PACKET_ID_MESSAGE: {
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if(friend_message_isset)
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{
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(*friend_message)(i, temp + 1, len - 1);
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}
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break;
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}
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}
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}
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else
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{
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if(is_cryptoconnected(friendlist[i].crypt_connection_id) == 4) /* if the connection timed out, kill it */
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{
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crypto_kill(friendlist[i].crypt_connection_id);
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friendlist[i].crypt_connection_id = -1;
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friendlist[i].status = 3;
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}
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break;
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}
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}
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}
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}
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static void doInbound()
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{
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uint8_t secret_nonce[crypto_box_NONCEBYTES];
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uint8_t public_key[crypto_box_PUBLICKEYBYTES];
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uint8_t session_key[crypto_box_PUBLICKEYBYTES];
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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;
|
|
}
|