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toxcore/core/Messenger.c
slvr a56d87cd3f remember to call timer_poll
2013-08-12 14:54:40 +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"
#include "timer.h"
#define MIN(a,b) (((a)<(b))?(a):(b))
typedef struct {
uint8_t client_id[CLIENT_ID_SIZE];
int crypt_connection_id;
uint64_t 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 *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? */
} 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_statusmessage[MAX_STATUSMESSAGE_LENGTH];
static uint16_t self_statusmessage_length;
static USERSTATUS self_userstatus;
static Friend *friendlist;
static uint32_t numfriends;
static void set_friend_status(int friendnumber, uint8_t status);
static int write_cryptpacket_id(int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length);
/* 1 if we are online
0 if we are offline
static uint8_t online; */
/* set the size of the friend list to numfriends
return -1 if realloc fails */
int realloc_friendlist(uint32_t num) {
Friend *newfriendlist = realloc(friendlist, num*sizeof(Friend));
if (newfriendlist == NULL)
return -1;
memset(&newfriendlist[num-1], 0, sizeof(Friend));
friendlist = newfriendlist;
return 0;
}
/* 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.
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 FA_TOOLONG if message length is too long
* return FAERR_NOMESSAGE if no message (message length must be >= 1 byte)
* return FAERR_OWNKEY if user's own key
* return FAERR_ALREADYSENT if friend request already sent or already a friend
* return FAERR_UNKNOWN for unknown error
*/
int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
{
if (length >= (MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES
- crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES
+ crypto_box_ZEROBYTES))
return FAERR_TOOLONG;
if (length < 1)
return FAERR_NOMESSAGE;
if (memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
return FAERR_OWNKEY;
if (getfriend_id(client_id) != -1)
return FAERR_ALREADYSENT;
/* resize the friend list if necessary */
realloc_friendlist(numfriends + 1);
uint32_t i;
for (i = 0; i <= numfriends; ++i) {
if (friendlist[i].status == NOFRIEND) {
DHT_addfriend(client_id);
friendlist[i].status = FRIEND_ADDED;
friendlist[i].crypt_connection_id = -1;
friendlist[i].friend_request_id = -1;
memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
friendlist[i].statusmessage = calloc(1, 1);
friendlist[i].statusmessage_length = 1;
friendlist[i].userstatus = USERSTATUS_NONE;
memcpy(friendlist[i].info, data, length);
friendlist[i].info_size = length;
friendlist[i].message_id = 0;
friendlist[i].receives_read_receipts = 1; /* default: YES */
++numfriends;
return i;
}
}
return FAERR_UNKNOWN;
}
int m_addfriend_norequest(uint8_t * client_id)
{
if (getfriend_id(client_id) != -1)
return -1;
/* resize the friend list if necessary */
realloc_friendlist(numfriends + 1);
uint32_t i;
for (i = 0; i <= numfriends; ++i) {
if(friendlist[i].status == NOFRIEND) {
DHT_addfriend(client_id);
friendlist[i].status = FRIEND_REQUESTED;
friendlist[i].crypt_connection_id = -1;
friendlist[i].friend_request_id = -1;
memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
friendlist[i].statusmessage = calloc(1, 1);
friendlist[i].statusmessage_length = 1;
friendlist[i].userstatus = USERSTATUS_NONE;
friendlist[i].message_id = 0;
friendlist[i].receives_read_receipts = 1; /* default: YES */
++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].statusmessage);
memset(&friendlist[friendnumber], 0, sizeof(Friend));
uint32_t i;
for (i = numfriends; i != 0; --i) {
if (friendlist[i-1].status != NOFRIEND)
break;
}
numfriends = i;
realloc_friendlist(numfriends + 1);
return 0;
}
/* return FRIEND_ONLINE if friend is online
return FRIEND_CONFIRMED if friend is confirmed
return FRIEND_REQUESTED if the friend request was sent
return FRIEND_ADDED if the friend was added
return NOFRIEND if there is no friend with that number */
int m_friendstatus(int friendnumber)
{
if (friendnumber < 0 || friendnumber >= numfriends)
return NOFRIEND;
return friendlist[friendnumber].status;
}
/* 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 */
uint32_t m_sendmessage(int friendnumber, uint8_t *message, uint32_t length)
{
if (friendnumber < 0 || friendnumber >= numfriends)
return 0;
uint32_t msgid = ++friendlist[friendnumber].message_id;
if (msgid == 0)
msgid = 1; /* otherwise, false error */
if(m_sendmessage_withid(friendnumber, msgid, message, length)) {
return msgid;
}
return 0;
}
uint32_t m_sendmessage_withid(int friendnumber, uint32_t theid, uint8_t *message, uint32_t length)
{
if (length >= (MAX_DATA_SIZE - sizeof(theid)))
return 0;
uint8_t temp[MAX_DATA_SIZE];
theid = htonl(theid);
memcpy(temp, &theid, sizeof(theid));
memcpy(temp + sizeof(theid), message, length);
return write_cryptpacket_id(friendnumber, PACKET_ID_MESSAGE, temp, length + sizeof(theid));
}
/* 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(int friendnumber, uint8_t *action, uint32_t length)
{
return write_cryptpacket_id(friendnumber, PACKET_ID_ACTION, action, length);
}
/* 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;
return write_cryptpacket_id(friendnumber, PACKET_ID_NICKNAME, name, length);
}
/* 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 our nickname
put it in name
name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH bytes.
return the length of the name */
uint16_t getself_name(uint8_t *name)
{
memcpy(name, self_name, self_name_length);
return self_name_length;
}
/* 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_statusmessage(uint8_t *status, uint16_t length)
{
if (length > MAX_STATUSMESSAGE_LENGTH)
return -1;
memcpy(self_statusmessage, status, length);
self_statusmessage_length = length;
uint32_t i;
for (i = 0; i < numfriends; ++i)
friendlist[i].statusmessage_sent = 0;
return 0;
}
int m_set_userstatus(USERSTATUS status)
{
if (status >= USERSTATUS_INVALID) {
return -1;
}
self_userstatus = status;
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_STATUSMESSAGE_LENGTH */
int m_get_statusmessage_size(int friendnumber)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
return friendlist[friendnumber].statusmessage_length;
}
/* copy the user status of friendnumber into buf, truncating if needed to maxlen
bytes, use m_get_statusmessage_size to find out how much you need to allocate */
int m_copy_statusmessage(int friendnumber, uint8_t * buf, uint32_t maxlen)
{
if (friendnumber >= numfriends || friendnumber < 0)
return -1;
memset(buf, 0, maxlen);
memcpy(buf, friendlist[friendnumber].statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
return 0;
}
int m_copy_self_statusmessage(uint8_t * buf, uint32_t maxlen)
{
memset(buf, 0, maxlen);
memcpy(buf, self_statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
return 0;
}
USERSTATUS m_get_userstatus(int friendnumber)
{
if (friendnumber >= numfriends || friendnumber < 0)
return USERSTATUS_INVALID;
USERSTATUS status = friendlist[friendnumber].userstatus;
if (status >= USERSTATUS_INVALID) {
status = USERSTATUS_NONE;
}
return status;
}
USERSTATUS m_get_self_userstatus(void)
{
return self_userstatus;
}
static int send_statusmessage(int friendnumber, uint8_t * status, uint16_t length)
{
return write_cryptpacket_id(friendnumber, PACKET_ID_STATUSMESSAGE, status, length);
}
static int send_userstatus(int friendnumber, USERSTATUS status)
{
uint8_t stat = status;
return write_cryptpacket_id(friendnumber, PACKET_ID_USERSTATUS, &stat, sizeof(stat));
}
static int set_friend_statusmessage(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].statusmessage);
friendlist[friendnumber].statusmessage = newstatus;
friendlist[friendnumber].statusmessage_length = length;
return 0;
}
static void set_friend_userstatus(int friendnumber, USERSTATUS status)
{
friendlist[friendnumber].userstatus = status;
}
/* Sets whether we send read receipts for friendnumber. */
void m_set_sends_receipts(int friendnumber, int yesno)
{
if (yesno != 0 || yesno != 1)
return;
if (friendnumber >= numfriends || friendnumber < 0)
return;
friendlist[friendnumber].receives_read_receipts = yesno;
}
/* 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_action)(int, uint8_t *, uint16_t);
static uint8_t friend_action_isset = 0;
void m_callback_action(void (*function)(int, uint8_t *, uint16_t))
{
friend_action = function;
friend_action_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_statusmessagechange)(int, uint8_t *, uint16_t);
static uint8_t friend_statusmessagechange_isset = 0;
void m_callback_statusmessage(void (*function)(int, uint8_t *, uint16_t))
{
friend_statusmessagechange = function;
friend_statusmessagechange_isset = 1;
}
static void (*friend_userstatuschange)(int, USERSTATUS);
static uint8_t friend_userstatuschange_isset = 0;
void m_callback_userstatus(void (*function)(int, USERSTATUS))
{
friend_userstatuschange = function;
friend_userstatuschange_isset = 1;
}
static void (*read_receipt)(int, uint32_t);
static uint8_t read_receipt_isset = 0;
void m_callback_read_receipt(void (*function)(int, uint32_t))
{
read_receipt = function;
read_receipt_isset = 1;
}
static void (*friend_connectionstatuschange)(int, uint8_t);
static uint8_t friend_connectionstatuschange_isset = 0;
void m_callback_connectionstatus(void (*function)(int, uint8_t))
{
friend_connectionstatuschange = function;
friend_connectionstatuschange_isset = 1;
}
static void check_friend_connectionstatus(int friendnumber, uint8_t status)
{
if (!friend_connectionstatuschange_isset)
return;
if (status == NOFRIEND)
return;
const uint8_t was_connected = friendlist[friendnumber].status == FRIEND_ONLINE;
const uint8_t is_connected = status == FRIEND_ONLINE;
if (is_connected != was_connected)
friend_connectionstatuschange(friendnumber, is_connected);
}
static void set_friend_status(int friendnumber, uint8_t status)
{
check_friend_connectionstatus(friendnumber, status);
friendlist[friendnumber].status = status;
}
static int write_cryptpacket_id(int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length)
{
if (friendnumber < 0 || friendnumber >= numfriends)
return 0;
if (length >= MAX_DATA_SIZE || friendlist[friendnumber].status != FRIEND_ONLINE)
return 0;
uint8_t packet[length + 1];
packet[0] = packet_id;
memcpy(packet + 1, data, length);
return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, packet, length + 1);
}
//TODO: make this function not suck.
static void doFriends(void)
{
/* 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 == FRIEND_ADDED) {
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 */
set_friend_status(i, FRIEND_REQUESTED);
else if (fr > 0)
set_friend_status(i, FRIEND_REQUESTED);
}
if (friendlist[i].status == FRIEND_REQUESTED || friendlist[i].status == FRIEND_CONFIRMED) { /* friend is not online */
if (friendlist[i].status == FRIEND_REQUESTED) {
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 */
set_friend_status(i, FRIEND_ONLINE);
friendlist[i].name_sent = 0;
friendlist[i].userstatus_sent = 0;
friendlist[i].statusmessage_sent = 0;
break;
case 4:
crypto_kill(friendlist[i].crypt_connection_id);
friendlist[i].crypt_connection_id = -1;
break;
default:
break;
}
}
while (friendlist[i].status == FRIEND_ONLINE) { /* 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].statusmessage_sent == 0) {
if (send_statusmessage(i, self_statusmessage, self_statusmessage_length))
friendlist[i].statusmessage_sent = 1;
}
if (friendlist[i].userstatus_sent == 0) {
if (send_userstatus(i, self_userstatus))
friendlist[i].userstatus_sent = 1;
}
len = read_cryptpacket(friendlist[i].crypt_connection_id, temp);
uint8_t packet_id = temp[0];
uint8_t* data = temp + 1;
int data_length = len - 1;
if (len > 0) {
switch (packet_id) {
case PACKET_ID_NICKNAME: {
if (data_length >= MAX_NAME_LENGTH || data_length == 0)
break;
if(friend_namechange_isset)
friend_namechange(i, data, data_length);
memcpy(friendlist[i].name, data, data_length);
friendlist[i].name[data_length - 1] = 0; /* make sure the NULL terminator is present. */
break;
}
case PACKET_ID_STATUSMESSAGE: {
if (data_length == 0)
break;
uint8_t *status = calloc(MIN(data_length, MAX_STATUSMESSAGE_LENGTH), 1);
memcpy(status, data, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
if (friend_statusmessagechange_isset)
friend_statusmessagechange(i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
set_friend_statusmessage(i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
free(status);
break;
}
case PACKET_ID_USERSTATUS: {
if (data_length != 1)
break;
USERSTATUS status = data[0];
if (friend_userstatuschange_isset)
friend_userstatuschange(i, status);
set_friend_userstatus(i, status);
break;
}
case PACKET_ID_MESSAGE: {
uint8_t *message_id = data;
uint8_t message_id_length = 4;
uint8_t *message = data + message_id_length;
uint16_t message_length = data_length - message_id_length;
if (friendlist[i].receives_read_receipts) {
write_cryptpacket_id(i, PACKET_ID_RECEIPT, message_id, message_id_length);
}
if (friend_message_isset)
(*friend_message)(i, message, message_length);
break;
}
case PACKET_ID_ACTION: {
if (friend_action_isset)
(*friend_action)(i, data, data_length);
break;
}
case PACKET_ID_RECEIPT: {
uint32_t msgid;
if (data_length < sizeof(msgid))
break;
memcpy(&msgid, data, sizeof(msgid));
msgid = ntohl(msgid);
if (read_receipt_isset)
(*read_receipt)(i, msgid);
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;
set_friend_status(i, FRIEND_CONFIRMED);
}
break;
}
}
}
}
static void doInbound(void)
{
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);
set_friend_status(friend_id, FRIEND_CONFIRMED);
}
}
}
#define PORT 33445
/*Interval in seconds between LAN discovery packet sending*/
#define LAN_DISCOVERY_INTERVAL 60
/*Send a LAN discovery packet every LAN_DISCOVERY_INTERVAL seconds*/
static int LANdiscovery_timercallback(timer* t, void* ignore)
{
send_LANdiscovery(htons(PORT));
timer_start(t, LAN_DISCOVERY_INTERVAL);
return 0;
}
/* run this at startup */
int initMessenger(void)
{
timer_init();
new_keys();
m_set_statusmessage((uint8_t*)"Online", sizeof("Online"));
initNetCrypto();
IP ip;
ip.i = 0;
if(init_networking(ip,PORT) == -1)
return -1;
DHT_init();
LosslessUDP_init();
friendreq_init();
LANdiscovery_init();
timer_single(&LANdiscovery_timercallback, 0, LAN_DISCOVERY_INTERVAL);
return 0;
}
/* the main loop that needs to be run at least 200 times per second. */
void doMessenger(void)
{
networking_poll();
timer_poll();
doDHT();
doLossless_UDP();
doNetCrypto();
doInbound();
doFriends();
}
/* returns the size of the messenger data (for saving) */
uint32_t Messenger_size(void)
{
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_statusmessage(fnum, temp[i].statusmessage, temp[i].statusmessage_length); */
}
}
free(temp);
return 0;
}
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