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/* Messenger.h
*
* An implementation of a simple text chat only messenger on the tox network core.
*
* NOTE: All the text in the messages must be encoded using UTF-8
*
* 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/>.
*
*/
#ifndef MESSENGER_H
#define MESSENGER_H
#include "net_crypto.h"
#include "DHT.h"
#include "friend_requests.h"
#include "LAN_discovery.h"
#include "group_chats.h"
#define MAX_NAME_LENGTH 128
#define MAX_STATUSMESSAGE_LENGTH 1007
#define FRIEND_ADDRESS_SIZE (crypto_box_PUBLICKEYBYTES + sizeof(uint32_t) + sizeof(uint16_t))
#define PACKET_ID_PING 0
#define PACKET_ID_NICKNAME 48
#define PACKET_ID_STATUSMESSAGE 49
#define PACKET_ID_USERSTATUS 50
#define PACKET_ID_RECEIPT 65
#define PACKET_ID_MESSAGE 64
#define PACKET_ID_ACTION 63
/* Status definitions. */
enum {
NOFRIEND,
FRIEND_ADDED,
FRIEND_REQUESTED,
FRIEND_CONFIRMED,
FRIEND_ONLINE,
};
/* Errors for m_addfriend
* FAERR - Friend Add Error
*/
enum {
FAERR_TOOLONG = -1,
FAERR_NOMESSAGE = -2,
FAERR_OWNKEY = -3,
FAERR_ALREADYSENT = -4,
FAERR_UNKNOWN = -5,
FAERR_BADCHECKSUM = -6,
FAERR_SETNEWNOSPAM = -7,
FAERR_NOMEM = -8
};
/* Don't assume MAX_STATUSMESSAGE_LENGTH will stay at 128, it may be increased
* to an absurdly large number later.
*/
/* Default start timeout in seconds between friend requests. */
#define FRIENDREQUEST_TIMEOUT 5;
/* Interval between the sending of ping packets. */
#define FRIEND_PING_INTERVAL 5
/* If no packets are recieved from friend in this time interval, kill the connection. */
#define FRIEND_CONNECTION_TIMEOUT (FRIEND_PING_INTERVAL * 2)
/* USERSTATUS -
* Represents userstatuses someone can have.
*/
typedef enum {
USERSTATUS_NONE,
USERSTATUS_AWAY,
USERSTATUS_BUSY,
USERSTATUS_INVALID
}
USERSTATUS;
typedef struct {
uint8_t client_id[CLIENT_ID_SIZE];
int crypt_connection_id;
uint64_t friendrequest_lastsent; // Time at which the last friend request was sent.
uint32_t friendrequest_timeout; // The timeout between successful friendrequest sending attempts.
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];
uint16_t name_length;
uint8_t name_sent; // 0 if we didn't send our name to this friend 1 if we have.
uint8_t *statusmessage;
uint16_t statusmessage_length;
uint8_t statusmessage_sent;
USERSTATUS userstatus;
uint8_t userstatus_sent;
uint16_t info_size; // Length of the info.
uint32_t message_id; // a semi-unique id used in read receipts.
uint8_t receives_read_receipts; // shall we send read receipts to this person?
uint32_t friendrequest_nospam; // The nospam number used in the friend request.
uint64_t ping_lastrecv;
uint64_t ping_lastsent;
} Friend;
typedef struct Messenger {
Networking_Core *net;
Net_Crypto *net_crypto;
DHT *dht;
Friend_Requests fr;
uint8_t name[MAX_NAME_LENGTH];
uint16_t name_length;
uint8_t statusmessage[MAX_STATUSMESSAGE_LENGTH];
uint16_t statusmessage_length;
USERSTATUS userstatus;
Friend *friendlist;
uint32_t numfriends;
Group_Chat *chats;
uint32_t numchats;
uint64_t last_LANdiscovery;
void (*friend_message)(struct Messenger *m, int, uint8_t *, uint16_t, void *);
void *friend_message_userdata;
void (*friend_action)(struct Messenger *m, int, uint8_t *, uint16_t, void *);
void *friend_action_userdata;
void (*friend_namechange)(struct Messenger *m, int, uint8_t *, uint16_t, void *);
void *friend_namechange_userdata;
void (*friend_statusmessagechange)(struct Messenger *m, int, uint8_t *, uint16_t, void *);
void *friend_statusmessagechange_userdata;
void (*friend_userstatuschange)(struct Messenger *m, int, USERSTATUS, void *);
void *friend_userstatuschange_userdata;
void (*read_receipt)(struct Messenger *m, int, uint32_t, void *);
void *read_receipt_userdata;
void (*friend_statuschange)(struct Messenger *m, int, uint8_t, void *);
void *friend_statuschange_userdata;
void (*friend_connectionstatuschange)(struct Messenger *m, int, uint8_t, void *);
void *friend_connectionstatuschange_userdata;
} Messenger;
/* Format: [client_id (32 bytes)][nospam number (4 bytes)][checksum (2 bytes)]
*
* return FRIEND_ADDRESS_SIZE byte address to give to others.
*/
void getaddress(Messenger *m, uint8_t *address);
/* Add a friend.
* Set the data that will be sent along with friend request.
* address is the address of the friend (returned by getaddress of the friend you wish to add) it must be FRIEND_ADDRESS_SIZE bytes. TODO: add checksum.
* data is the data and length is the length.
*
* return the friend number if success.
* return -1 if message length is too long.
* return -2 if no message (message length must be >= 1 byte).
* return -3 if user's own key.
* return -4 if friend request already sent or already a friend.
* return -5 for unknown error.
* return -6 if bad checksum in address.
* return -7 if the friend was already there but the nospam was different.
* (the nospam for that friend was set to the new one).
* return -8 if increasing the friend list size fails.
*/
int m_addfriend(Messenger *m, uint8_t *address, uint8_t *data, uint16_t length);
/* Add a friend without sending a friendrequest.
* return the friend number if success.
* return -1 if failure.
*/
int m_addfriend_norequest(Messenger *m, uint8_t *client_id);
/* return the friend id associated to that client id.
* return -1 if no such friend.
*/
int getfriend_id(Messenger *m, uint8_t *client_id);
/* 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(Messenger *m, int friend_id, uint8_t *client_id);
/* Remove a friend. */
int m_delfriend(Messenger *m, int friendnumber);
/* Checks friend's connecting status.
*
* return 1 if friend is connected to us (Online).
* return 0 if friend is not connected to us (Offline).
* return -1 on failure.
*/
int m_get_friend_connectionstatus(Messenger *m, int friendnumber);
/* Checks if there exists a friend with given friendnumber.
*
* return 1 if friend exists.
* return 0 if friend doesn't exist.
*/
int m_friend_exists(Messenger *m, int friendnumber);
/* Send a text chat message to an online friend.
*
* return the message id if packet was successfully put into the send queue.
* return 0 if it was not.
*
* You will want to retain the return value, it will be passed to your read receipt callback
* if one is received.
* m_sendmessage_withid will send a message with the id of your choosing,
* however we can generate an id for you by calling plain m_sendmessage.
*/
uint32_t m_sendmessage(Messenger *m, int friendnumber, uint8_t *message, uint32_t length);
uint32_t m_sendmessage_withid(Messenger *m, int friendnumber, uint32_t theid, uint8_t *message, uint32_t length);
/* Send an action to an online friend.
*
* return 1 if packet was successfully put into the send queue.
* return 0 if it was not.
*/
int m_sendaction(Messenger *m, int friendnumber, uint8_t *action, uint32_t length);
/* 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(Messenger *m, uint8_t *name, uint16_t length);
/*
* Get your nickname.
* m - The messanger context to use.
* name - Pointer to a string for the name.
* nlen - The length of the string buffer.
*
* return length of the name.
* return 0 on error.
*/
uint16_t getself_name(Messenger *m, uint8_t *name, uint16_t nlen);
/* Get name of friendnumber and put it in name.
* name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH (128) bytes.
*
* return length of name if success.
* return -1 if failure.
*/
int getname(Messenger *m, int friendnumber, uint8_t *name);
/* Set our user status.
* You are responsible for freeing status after.
*
* returns 0 on success.
* returns -1 on failure.
*/
int m_set_statusmessage(Messenger *m, uint8_t *status, uint16_t length);
int m_set_userstatus(Messenger *m, USERSTATUS status);
/* return the length of friendnumber's status message, including null.
* Pass it into malloc.
*/
int m_get_statusmessage_size(Messenger *m, int friendnumber);
/* Copy friendnumber's status message into buf, truncating if size is over maxlen.
* Get the size you need to allocate from m_get_statusmessage_size.
* The self variant will copy our own status message.
*
* returns the length of the copied data on success
* retruns -1 on failure.
*/
int m_copy_statusmessage(Messenger *m, int friendnumber, uint8_t *buf, uint32_t maxlen);
int m_copy_self_statusmessage(Messenger *m, uint8_t *buf, uint32_t maxlen);
/* return one of USERSTATUS values.
* Values unknown to your application should be represented as USERSTATUS_NONE.
* As above, the self variant will return our own USERSTATUS.
* If friendnumber is invalid, this shall return USERSTATUS_INVALID.
*/
USERSTATUS m_get_userstatus(Messenger *m, int friendnumber);
USERSTATUS m_get_self_userstatus(Messenger *m);
/* Sets whether we send read receipts for friendnumber.
* This function is not lazy, and it will fail if yesno is not (0 or 1).
*/
void m_set_sends_receipts(Messenger *m, int friendnumber, int yesno);
/* 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)
*/
void m_callback_friendrequest(Messenger *m, void (*function)(uint8_t *, uint8_t *, uint16_t, void *), void *userdata);
/* 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)
*/
void m_callback_friendmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void *),
void *userdata);
/* Set the function that will be executed when an action from a friend is received.
* Function format is: function(int friendnumber, uint8_t * action, uint32_t length)
*/
void m_callback_action(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void *), void *userdata);
/* Set the callback for name changes.
* Function(int friendnumber, uint8_t *newname, uint16_t length)
* You are not responsible for freeing newname.
*/
void m_callback_namechange(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void *),
void *userdata);
/* Set the callback for status message changes.
* Function(int friendnumber, uint8_t *newstatus, uint16_t length)
*
* You are not responsible for freeing newstatus
*/
void m_callback_statusmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void *),
void *userdata);
/* Set the callback for status type changes.
* Function(int friendnumber, USERSTATUS kind)
*/
void m_callback_userstatus(Messenger *m, void (*function)(Messenger *m, int, USERSTATUS, void *), void *userdata);
/* Set the callback for read receipts.
* Function(int friendnumber, uint32_t receipt)
*
* If you are keeping a record of returns from m_sendmessage,
* receipt might be one of those values, meaning the message
* has been received on the other side.
* Since core doesn't track ids for you, receipt may not correspond to any message.
* In that case, you should discard it.
*/
void m_callback_read_receipt(Messenger *m, void (*function)(Messenger *m, int, uint32_t, void *), void *userdata);
/* Set the callback for connection status changes.
* function(int friendnumber, uint8_t status)
*
* Status:
* 0 -- friend went offline after being previously online.
* 1 -- friend went online.
*
* Note that this callback is not called when adding friends, thus the "after
* being previously online" part.
* It's assumed that when adding friends, their connection status is offline.
*/
void m_callback_connectionstatus(Messenger *m, void (*function)(Messenger *m, int, uint8_t, void *), void *userdata);
/* Run this at startup.
* return allocated instance of Messenger on success.
* return 0 if there are problems.
*/
Messenger *initMessenger(uint8_t ipv6enabled);
/* Run this before closing shop
* Free all datastructures.
*/
void cleanupMessenger(Messenger *M);
/* The main loop that needs to be run at least 20 times per second. */
void doMessenger(Messenger *m);
/* SAVING AND LOADING FUNCTIONS: */
/* return size of the messenger data (for saving). */
uint32_t Messenger_size(Messenger *m);
/* Save the messenger in data (must be allocated memory of size Messenger_size()) */
void Messenger_save(Messenger *m, uint8_t *data);
/* Load the messenger from data of size length. */
int Messenger_load(Messenger *m, uint8_t *data, uint32_t length);
/* Allocate and return a list of valid friend id's. List must be freed by the
* caller.
*
* retun 0 if success.
* return -1 if failure.
*/
int get_friendlist(Messenger *m, int **out_list, uint32_t *out_list_length);
#endif
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