/* Send data of len with message_id to groupnumber.
*
* return number of peers it was sent to on success.
* return 0 on failure.
*/
static unsigned int send_message_group(const Group_Chats *g_c, int groupnumber, uint8_t message_id, const uint8_t *data,
uint16_t len)
{
if (len > MAX_GROUP_MESSAGE_DATA_LEN)
return 0;
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return 0;
if (g->status != GROUPCHAT_STATUS_CONNECTED)
return 0;
uint8_t packet[sizeof(uint16_t) + sizeof(uint32_t) + 1 + len];
uint16_t peer_num = htons(g->peer_number);
memcpy(packet, &peer_num, sizeof(peer_num));
++g->message_number;
if (!g->message_number)
++g->message_number;
uint32_t message_num = htonl(g->message_number);
memcpy(packet + sizeof(uint16_t), &message_num, sizeof(message_num));
packet[sizeof(uint16_t) + sizeof(uint32_t)] = message_id;
if (len)
memcpy(packet + sizeof(uint16_t) + sizeof(uint32_t) + 1, data, len);
return send_message_all_close(g_c, groupnumber, packet, sizeof(packet), -1);
}
static void handle_direct_packet(Group_Chats *g_c, int groupnumber, const uint8_t *data, uint16_t length,
int close_index)
{
if (length == 0)
return;
switch (data[0]) {
case PEER_QUERY_ID: {
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return;
send_peers(g_c, groupnumber, g->close[close_index].number, g->close[close_index].group_number);
}
break;
case PEER_RESPONSE_ID: {
handle_send_peers(g_c, groupnumber, data + 1, length - 1);
}
break;
}
}
/* Add friend to group chat.
*
* return close index on success
* return -1 on failure.
*/
static int add_conn_to_groupchat(Group_Chats *g_c, int friendcon_id, int groupnumber, uint8_t closest)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint16_t i, ind = MAX_GROUP_CONNECTIONS;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE) {
ind = i;
continue;
}
if (g->close[i].number == (uint32_t)friendcon_id) {
return i; /* Already in list. */
}
break;
}
if (ind == MAX_GROUP_CONNECTIONS)
return -1;
friend_connection_lock(g_c->fr_c, friendcon_id);
g->close[ind].type = GROUPCHAT_CLOSE_CONNECTION;
g->close[ind].number = friendcon_id;
g->close[ind].closest = closest;
//TODO
friend_connection_callbacks(g_c->m->fr_c, friendcon_id, GROUPCHAT_CALLBACK_INDEX, &handle_status, &handle_packet, 0,
g_c, friendcon_id);
return ind;
}
static int handle_send_peers(Group_Chats *g_c, int groupnumber, const uint8_t *data, uint16_t length)
{
if (length == 0)
return -1;
if (length % (sizeof(uint16_t) + crypto_box_PUBLICKEYBYTES * 2) != 0)
return -1;
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
unsigned int i;
const uint8_t *d = data;
while ((length - (d - data)) >= sizeof(uint16_t) + crypto_box_PUBLICKEYBYTES * 2) {
uint16_t peer_num;
memcpy(&peer_num, d, sizeof(peer_num));
peer_num = ntohs(peer_num);
d += sizeof(uint16_t);
addpeer(g_c, groupnumber, d, d + crypto_box_PUBLICKEYBYTES, peer_num);
if (g->status == GROUPCHAT_STATUS_VALID
&& memcmp(d, g_c->m->net_crypto->self_public_key, crypto_box_PUBLICKEYBYTES) == 0) {
g->peer_number = peer_num;
g->status = GROUPCHAT_STATUS_CONNECTED;
}
d += crypto_box_PUBLICKEYBYTES * 2;
}
return 0;
}
/* Return the number of peers in the group chat on success.
* return -1 on failure
*/
int group_number_peers(const Group_Chats *g_c, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
return g->numpeers;
}
static int connect_to_closest(Group_Chats *g_c, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
if (!g->changed)
return 0;
unsigned int i;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE)
continue;
if (!g->close[i].closest)
continue;
uint8_t real_pk[crypto_box_PUBLICKEYBYTES];
uint8_t dht_temp_pk[crypto_box_PUBLICKEYBYTES];
get_friendcon_public_keys(real_pk, dht_temp_pk, g_c->fr_c, g->close[i].number);
if (!pk_in_closest_peers(g, real_pk)) {
g->close[i].type = GROUPCHAT_CLOSE_NONE;
kill_friend_connection(g_c->fr_c, g->close[i].number);
}
}
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
if (!g->closest_peers[i].entry)
continue;
int friendcon_id = getfriend_conn_id_pk(g_c->fr_c, g->closest_peers[i].real_pk);
if (friendcon_id == -1) {
friendcon_id = new_friend_connection(g_c->fr_c, g->closest_peers[i].real_pk);
if (friendcon_id == -1) {
continue;
}
set_dht_temp_pk(g_c->fr_c, friendcon_id, g->closest_peers[i].temp_pk);
}
add_conn_to_groupchat(g_c, friendcon_id, groupnumber, 1);
if (friend_con_connected(g_c->fr_c, friendcon_id) == FRIENDCONN_STATUS_CONNECTED) {
send_packet_online(g_c->fr_c, friendcon_id, groupnumber, g->identifier);
}
}
g->changed = 0;
return 0;
}
static void handle_direct_packet(Group_Chats *g_c, int groupnumber, const uint8_t *data, uint16_t length,
int close_index)
{
if (length == 0)
return;
switch (data[0]) {
case PEER_KILL_ID: {
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return;
if (!g->close[close_index].closest) {
g->close[close_index].type = GROUPCHAT_CLOSE_NONE;
kill_friend_connection(g_c->fr_c, g->close[close_index].number);
}
}
case PEER_QUERY_ID: {
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return;
send_peers(g_c, groupnumber, g->close[close_index].number, g->close[close_index].group_number);
}
break;
case PEER_RESPONSE_ID: {
handle_send_peers(g_c, groupnumber, data + 1, length - 1);
}
break;
}
}
static int ping_groupchat(Group_Chats *g_c, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
if (is_timeout(g->last_sent_ping, GROUP_PING_INTERVAL)) {
if (group_ping_send(g_c, groupnumber) != -1) /* Ping */
g->last_sent_ping = unix_time();
}
return 0;
}
/*
* Add a peer to the group chat.
*
* return peer_index if success or peer already in chat.
* return -1 if error.
*/
static int addpeer(Group_Chats *g_c, int groupnumber, const uint8_t *real_pk, const uint8_t *temp_pk,
uint16_t peer_number)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
//TODO
int peer_index = peer_in_chat(g, real_pk);
if (peer_index != -1) {
id_copy(g->group[peer_index].temp_pk, temp_pk);
if (g->group[peer_index].peer_number != peer_number)
return -1;
return peer_index;
}
peer_index = get_peer_index(g, peer_number);
if (peer_index != -1)
return -1;
Group_Peer *temp;
temp = realloc(g->group, sizeof(Group_Peer) * (g->numpeers + 1));
if (temp == NULL)
return -1;
memset(&(temp[g->numpeers]), 0, sizeof(Group_Peer));
g->group = temp;
id_copy(g->group[g->numpeers].real_pk, real_pk);
id_copy(g->group[g->numpeers].temp_pk, temp_pk);
g->group[g->numpeers].peer_number = peer_number;
g->group[g->numpeers].last_recv = unix_time();
++g->numpeers;
add_to_closest(g_c, groupnumber, real_pk, temp_pk);
if (g_c->peer_namelistchange)
g_c->peer_namelistchange(g_c->m, groupnumber, g->numpeers - 1, CHAT_CHANGE_PEER_ADD,
g_c->group_namelistchange_userdata);
return (g->numpeers - 1);
}
/* Send current name (set in messenger) to all online groups.
*/
void send_name_all_groups(Group_Chats *g_c)
{
unsigned int i;
for (i = 0; i < g_c->num_chats; ++i) {
Group_c *g = get_group_c(g_c, i);
if (!g)
continue;
if (g->status == GROUPCHAT_STATUS_CONNECTED) {
group_name_send(g_c, i, g_c->m->name, g_c->m->name_length);
}
}
}
/* List all the peers in the group chat.
*
* Copies the names of the peers to the name[length][MAX_NAME_LENGTH] array.
*
* Copies the lengths of the names to lengths[length]
*
* returns the number of peers on success.
*
* return -1 on failure.
*/
int group_names(const Group_Chats *g_c, int groupnumber, uint8_t names[][MAX_NAME_LENGTH], uint16_t lengths[],
uint16_t length)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
int i;
for (i = 0; i < g->numpeers && i < length; ++i) {
lengths[i] = group_peername(g_c, groupnumber, i, names[i]);
}
return i;
}
/* main groupchats loop. */
void do_groupchats(Group_Chats *g_c)
{
unsigned int i;
for (i = 0; i < g_c->num_chats; ++i) {
Group_c *g = get_group_c(g_c, i);
if (!g)
continue;
if (g->status == GROUPCHAT_STATUS_CONNECTED)
connect_to_closest(g_c, i);
}
//TODO
}
/* return number of peers sent on success.
* return 0 on failure.
*/
static unsigned int send_peers(Group_Chats *g_c, int groupnumber, int friendcon_id, uint16_t group_num)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint8_t packet[MAX_CRYPTO_DATA_SIZE - (1 + sizeof(uint16_t))];
packet[0] = PEER_RESPONSE_ID;
uint8_t *p = packet + 1;
uint16_t sent = 0;
unsigned int i;
for (i = 0; i < g->numpeers; ++i) {
if ((p - packet) + sizeof(uint16_t) + crypto_box_PUBLICKEYBYTES * 2 + 1 + g->group[i].nick_len > sizeof(packet)) {
if (send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_GROUPCHAT, group_num, packet, (p - packet))) {
sent = i;
} else {
return sent;
}
p = packet + 1;
}
uint16_t peer_num = htons(g->group[i].peer_number);
memcpy(p, &peer_num, sizeof(peer_num));
p += sizeof(peer_num);
memcpy(p, g->group[i].real_pk, crypto_box_PUBLICKEYBYTES);
p += crypto_box_PUBLICKEYBYTES;
memcpy(p, g->group[i].temp_pk, crypto_box_PUBLICKEYBYTES);
p += crypto_box_PUBLICKEYBYTES;
*p = g->group[i].nick_len;
p += 1;
memcpy(p, g->group[i].nick, g->group[i].nick_len);
p += g->group[i].nick_len;
}
if (sent != i) {
if (send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_GROUPCHAT, group_num, packet, (p - packet))) {
sent = i;
}
}
return sent;
}
static int handle_packet_online(Group_Chats *g_c, int friendcon_id, uint8_t *data, uint16_t length)
{
if (length != ONLINE_PACKET_DATA_SIZE)
return -1;
int groupnumber = get_group_num(g_c, data + sizeof(uint16_t));
uint16_t other_groupnum;
memcpy(&other_groupnum, data, sizeof(uint16_t));
other_groupnum = ntohs(other_groupnum);
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
int index = friend_in_close(g, friendcon_id);
if (index == -1)
return -1;
g->close[index].group_number = other_groupnum;
g->close[index].type = GROUPCHAT_CLOSE_ONLINE;
if (g->number_joined != -1 && g->number_joined != friendcon_id) {
int fr_close_index = friend_in_close(g, g->number_joined);
uint8_t real_pk[crypto_box_PUBLICKEYBYTES];
uint8_t dht_temp_pk[crypto_box_PUBLICKEYBYTES];
get_friendcon_public_keys(real_pk, dht_temp_pk, g_c->fr_c, g->number_joined);
g->number_joined = -1;
if (fr_close_index == -1)
return -1;
if (!g->close[fr_close_index].closest && pk_in_closest_peers(g, real_pk)) {
g->close[fr_close_index].closest = 1;
}
if (!g->close[fr_close_index].closest) {
g->close[fr_close_index].type = GROUPCHAT_CLOSE_NONE;
send_peer_kill(g_c, g->close[fr_close_index].number, g->close[fr_close_index].group_number);
kill_friend_connection(g_c->fr_c, g->close[fr_close_index].number);
}
}
return 0;
}
static int handle_packet(void *object, int friendcon_id, uint8_t *data, uint16_t length)
{
Group_Chats *g_c = object;
if (length < 1 + sizeof(uint16_t) + 1)
return -1;
if (data[0] == PACKET_ID_ONLINE_PACKET) {
return handle_packet_online(g_c, friendcon_id, data + 1, length - 1);
}
if (data[0] != PACKET_ID_DIRECT_GROUPCHAT && data[0] != PACKET_ID_MESSAGE_GROUPCHAT)
return -1;
uint16_t groupnumber;
memcpy(&groupnumber, data + 1, sizeof(uint16_t));
groupnumber = ntohs(groupnumber);
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
int index = friend_in_close(g, friendcon_id);
if (index == -1)
return -1;
switch (data[0]) {
case PACKET_ID_DIRECT_GROUPCHAT: {
handle_direct_packet(g_c, groupnumber, data + 1 + sizeof(uint16_t), length - (1 + sizeof(uint16_t)), index);
break;
}
case PACKET_ID_MESSAGE_GROUPCHAT: {
handle_message_packet_group(g_c, groupnumber, data + 1 + sizeof(uint16_t), length - (1 + sizeof(uint16_t)), index);
break;
}
default: {
return 0;
}
}
return 0;
}
/* Copy the name of peernumber who is in groupnumber to name.
* name must be at least MAX_NAME_LENGTH long.
*
* return length of name if success
* return -1 if failure
*/
int group_peername(const Group_Chats *g_c, int groupnumber, int peernumber, uint8_t *name)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
if ((uint32_t)peernumber >= g->numpeers)
return -1;
if (g->group[peernumber].nick_len == 0) {
memcpy(name, "Tox User", 8);
return 8;
}
memcpy(name, g->group[peernumber].nick, g->group[peernumber].nick_len);
return g->group[peernumber].nick_len;
}
static int handle_send_peers(Group_Chats *g_c, int groupnumber, const uint8_t *data, uint16_t length)
{
if (length == 0)
return -1;
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
unsigned int i;
const uint8_t *d = data;
while ((length - (d - data)) >= sizeof(uint16_t) + crypto_box_PUBLICKEYBYTES * 2 + 1) {
uint16_t peer_num;
memcpy(&peer_num, d, sizeof(peer_num));
peer_num = ntohs(peer_num);
d += sizeof(uint16_t);
int peer_index = addpeer(g_c, groupnumber, d, d + crypto_box_PUBLICKEYBYTES, peer_num);
if (peer_index == -1)
return -1;
if (g->status == GROUPCHAT_STATUS_VALID
&& memcmp(d, g_c->m->net_crypto->self_public_key, crypto_box_PUBLICKEYBYTES) == 0) {
g->peer_number = peer_num;
g->status = GROUPCHAT_STATUS_CONNECTED;
group_name_send(g_c, groupnumber, g_c->m->name, g_c->m->name_length);
}
d += crypto_box_PUBLICKEYBYTES * 2;
uint8_t name_length = *d;
d += 1;
if (name_length > (length - (d - data)) || name_length > MAX_NAME_LENGTH)
return -1;
setnick(g_c, groupnumber, peer_index, d, name_length);
d += name_length;
}
return 0;
}
static int add_to_closest(Group_Chats *g_c, int groupnumber, const uint8_t *real_pk, const uint8_t *temp_pk)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
unsigned int i;
unsigned int index = DESIRED_CLOSE_CONNECTIONS;
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
if (g->closest_peers[i].entry == 0) {
index = i;
break;
}
}
if (index == DESIRED_CLOSE_CONNECTIONS) {
uint16_t comp_val = calculate_comp_value(g->real_pk, real_pk);
uint16_t comp_d = 0;
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
uint16_t comp = calculate_comp_value(g->real_pk, g->closest_peers[i].real_pk);
if (comp > comp_val && comp > comp_d) {
index = i;
comp_d = comp;
}
}
}
if (index == DESIRED_CLOSE_CONNECTIONS) {
return -1;
}
g->closest_peers[index].entry = 1;
memcpy(g->closest_peers[index].real_pk, real_pk, crypto_box_PUBLICKEYBYTES);
memcpy(g->closest_peers[index].temp_pk, temp_pk, crypto_box_PUBLICKEYBYTES);
g->changed = 1;
return 0;
}
/* invite friendnumber to groupnumber
* return 0 on success
* return -1 on failure
*/
int invite_friend(Group_Chats *g_c, int32_t friendnumber, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint8_t invite[INVITE_PACKET_SIZE];
invite[0] = INVITE_ID;
uint16_t groupchat_num = htons((uint16_t)groupnumber);
memcpy(invite + 1, &groupchat_num, sizeof(groupchat_num));
memcpy(invite + 1 + sizeof(groupchat_num), g->identifier, GROUP_IDENTIFIER_LENGTH);
if (send_group_invite_packet(g_c->m, friendnumber, invite, sizeof(invite))) {
return 0;
} else {
wipe_group_chat(g_c, groupnumber);
return -1;
}
}
/* Delete a groupchat from the chats array.
*
* return 0 on success.
* return -1 if failure.
*/
int del_groupchat(Group_Chats *g_c, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
unsigned int i;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE)
continue;
g->close[i].type = GROUPCHAT_CLOSE_NONE;
kill_friend_connection(g_c->fr_c, g->close[i].number);
}
free(g->group);
return wipe_group_chat(g_c, groupnumber);
}
static int groupchat_clear_timedout(Group_Chats *g_c, int groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint32_t i;
for (i = 0; i < g->numpeers; ++i) {
if (g->peer_number != g->group[i].peer_number && is_timeout(g->group[i].last_recv, GROUP_PING_INTERVAL * 2)) {
delpeer(g_c, groupnumber, i);
}
if (g->group == NULL || i >= g->numpeers)
break;
}
return 0;
}
/*
* Delete a peer from the group chat.
*
* return 0 if success
* return -1 if error.
*/
static int delpeer(Group_Chats *g_c, int groupnumber, int peer_index)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint32_t i;
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) { /* If peer is in closest_peers list, remove it. */
if (g->closest_peers[i].entry && id_equal(g->closest_peers[i].real_pk, g->group[peer_index].real_pk)) {
g->closest_peers[i].entry = 0;
g->changed = GROUPCHAT_CLOSEST_REMOVED;
break;
}
}
Group_Peer *temp;
--g->numpeers;
if (g->numpeers == 0) {
free(g->group);
g->group = NULL;
return 0;
}
if (g->numpeers != (uint32_t)peer_index)
memcpy(&g->group[peer_index], &g->group[g->numpeers], sizeof(Group_Peer));
temp = realloc(g->group, sizeof(Group_Peer) * (g->numpeers));
if (temp == NULL)
return -1;
g->group = temp;
if (g_c->peer_namelistchange)
g_c->peer_namelistchange(g_c->m, groupnumber, peer_index, CHAT_CHANGE_PEER_DEL, g_c->group_namelistchange_userdata);
return 0;
}
static int remove_close_conn(Group_Chats *g_c, int groupnumber, int friendcon_id)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
uint32_t i;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE)
continue;
if (g->close[i].number == friendcon_id) {
g->close[i].type = GROUPCHAT_CLOSE_NONE;
kill_friend_connection(g_c->fr_c, friendcon_id);
return 0;
}
}
return -1;
}
static void set_conns_type_close(Group_Chats *g_c, int groupnumber, int friendcon_id, uint8_t type)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return;
uint32_t i;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE)
continue;
if (g->close[i].number != friendcon_id)
continue;
if (type == GROUPCHAT_CLOSE_ONLINE) {
send_packet_online(g_c->fr_c, friendcon_id, groupnumber, g->identifier);
} else {
g->close[i].type = type;
}
}
}
static int setnick(Group_Chats *g_c, int groupnumber, int peer_index, const uint8_t *nick, uint16_t nick_len)
{
if (nick_len > MAX_NAME_LENGTH || nick_len == 0)
return -1;
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
/* same name as already stored? */
if (g->group[peer_index].nick_len == nick_len)
if (!memcmp(g->group[peer_index].nick, nick, nick_len))
return 0;
memcpy(g->group[peer_index].nick, nick, nick_len);
g->group[peer_index].nick_len = nick_len;
if (g_c->peer_namelistchange)
g_c->peer_namelistchange(g_c->m, groupnumber, peer_index, CHAT_CHANGE_PEER_NAME, g_c->group_namelistchange_userdata);
return 0;
}
static int handle_packet_online(Group_Chats *g_c, int friendcon_id, uint8_t *data, uint16_t length)
{
if (length != ONLINE_PACKET_DATA_SIZE)
return -1;
int groupnumber = get_group_num(g_c, data + sizeof(uint16_t));
uint16_t other_groupnum;
memcpy(&other_groupnum, data, sizeof(uint16_t));
other_groupnum = ntohs(other_groupnum);
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
int index = friend_in_close(g, friendcon_id);
if (index == -1)
return -1;
g->close[index].group_number = other_groupnum;
g->close[index].type = GROUPCHAT_CLOSE_ONLINE;
return 0;
}
/* Send message to all close except receiver (if receiver isn't -1)
* NOTE: this function appends the group chat number to the data passed to it.
*
* return number of messages sent.
*/
static unsigned int send_message_all_close(const Group_Chats *g_c, int groupnumber, const uint8_t *data,
uint16_t length, int receiver)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return 0;
uint16_t i, sent = 0;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type != GROUPCHAT_CLOSE_ONLINE)
continue;
if ((int)i == receiver)
continue;
if (send_packet_group_peer(g_c->fr_c, g->close[i].number, PACKET_ID_MESSAGE_GROUPCHAT, g->close[i].group_number, data,
length))
++sent;
}
return sent;
}
static void handle_friend_invite_packet(Messenger *m, int32_t friendnumber, const uint8_t *data, uint16_t length)
{
Group_Chats *g_c = m->group_chat_object;
if (length <= 1)
return;
const uint8_t *invite_data = data + 1;
uint16_t invite_length = length - 1;
switch (data[0]) {
case INVITE_ID: {
if (length != INVITE_PACKET_SIZE)
return;
int groupnumber = get_group_num(g_c, data + 1 + sizeof(uint16_t));
if (groupnumber == -1) {
if (g_c->invite_callback)
g_c->invite_callback(m, friendnumber, invite_data, invite_length, g_c->invite_callback_userdata);
return;
}
break;
}
case INVITE_RESPONSE_ID: {
if (length != INVITE_RESPONSE_PACKET_SIZE)
return;
uint16_t other_groupnum, groupnum;
memcpy(&groupnum, data + 1 + sizeof(uint16_t), sizeof(uint16_t));
groupnum = ntohs(groupnum);
Group_c *g = get_group_c(g_c, groupnum);
if (!g)
return;
if (memcmp(data + 1 + sizeof(uint16_t) * 2, g->identifier, GROUP_IDENTIFIER_LENGTH) != 0)
return;
uint16_t peer_number = rand(); /* TODO: what if two people enter the group at the same time and
are given the same peer_number by different nodes? */
unsigned int tries = 0;
while (get_peer_index(g, peer_number) != -1) {
peer_number = rand();
++tries;
if (tries > 32)
return;
}
memcpy(&other_groupnum, data + 1, sizeof(uint16_t));
other_groupnum = ntohs(other_groupnum);
int friendcon_id = getfriendcon_id(m, friendnumber);
uint8_t real_pk[crypto_box_PUBLICKEYBYTES], temp_pk[crypto_box_PUBLICKEYBYTES];
get_friendcon_public_keys(real_pk, temp_pk, g_c->fr_c, friendcon_id);
addpeer(g_c, groupnum, real_pk, temp_pk, peer_number);
int close_index = add_conn_to_groupchat(g_c, friendcon_id, groupnum, 0, 1);
if (close_index != -1) {
g->close[close_index].group_number = other_groupnum;
g->close[close_index].type = GROUPCHAT_CLOSE_ONLINE;
}
group_new_peer_send(g_c, groupnum, peer_number, real_pk, temp_pk);
break;
}
default:
return;
}
}
static int add_to_closest(Group_Chats *g_c, int groupnumber, const uint8_t *real_pk, const uint8_t *temp_pk)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return -1;
if (memcmp(g->real_pk, real_pk, crypto_box_PUBLICKEYBYTES) == 0)
return -1;
unsigned int i;
unsigned int index = DESIRED_CLOSE_CONNECTIONS;
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
if (g->closest_peers[i].entry && memcmp(real_pk, g->closest_peers[i].real_pk, crypto_box_PUBLICKEYBYTES) == 0) {
return 0;
}
}
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
if (g->closest_peers[i].entry == 0) {
index = i;
break;
}
}
if (index == DESIRED_CLOSE_CONNECTIONS) {
uint16_t comp_val = calculate_comp_value(g->real_pk, real_pk);
uint16_t comp_d = 0;
for (i = 0; i < (DESIRED_CLOSE_CONNECTIONS / 2); ++i) {
uint16_t comp;
comp = calculate_comp_value(g->real_pk, g->closest_peers[i].real_pk);
if (comp > comp_val && comp > comp_d) {
index = i;
comp_d = comp;
}
}
comp_val = calculate_comp_value(real_pk, g->real_pk);
for (i = (DESIRED_CLOSE_CONNECTIONS / 2); i < DESIRED_CLOSE_CONNECTIONS; ++i) {
uint16_t comp = calculate_comp_value(g->closest_peers[i].real_pk, g->real_pk);
if (comp > comp_val && comp > comp_d) {
index = i;
comp_d = comp;
}
}
}
if (index == DESIRED_CLOSE_CONNECTIONS) {
return -1;
}
uint8_t old_real_pk[crypto_box_PUBLICKEYBYTES];
uint8_t old_temp_pk[crypto_box_PUBLICKEYBYTES];
uint8_t old = 0;
if (g->closest_peers[index].entry) {
memcpy(old_real_pk, g->closest_peers[index].real_pk, crypto_box_PUBLICKEYBYTES);
memcpy(old_temp_pk, g->closest_peers[index].temp_pk, crypto_box_PUBLICKEYBYTES);
old = 1;
}
g->closest_peers[index].entry = 1;
memcpy(g->closest_peers[index].real_pk, real_pk, crypto_box_PUBLICKEYBYTES);
memcpy(g->closest_peers[index].temp_pk, temp_pk, crypto_box_PUBLICKEYBYTES);
if (old) {
add_to_closest(g_c, groupnumber, old_real_pk, old_temp_pk);
}
if (!g->changed)
g->changed = GROUPCHAT_CLOSEST_ADDED;
return 0;
}
static void handle_message_packet_group(Group_Chats *g_c, int groupnumber, const uint8_t *data, uint16_t length,
int close_index)
{
if (length < sizeof(uint16_t) + sizeof(uint32_t) + 1)
return;
Group_c *g = get_group_c(g_c, groupnumber);
if (!g)
return;
uint16_t peer_number;
memcpy(&peer_number, data, sizeof(uint16_t));
peer_number = ntohs(peer_number);
int index = get_peer_index(g, peer_number);
if (index == -1)
return;
uint32_t message_number;
memcpy(&message_number, data + sizeof(uint16_t), sizeof(message_number));
message_number = ntohl(message_number);
if (g->group[index].last_message_number == 0) {
g->group[index].last_message_number = message_number;
} else if (message_number - g->group[index].last_message_number > 64 ||
message_number == g->group[index].last_message_number) {
return;
}
g->group[index].last_message_number = message_number;
uint8_t message_id = data[sizeof(uint16_t) + sizeof(message_number)];
const uint8_t *msg_data = data + sizeof(uint16_t) + sizeof(message_number) + 1;
uint16_t msg_data_len = length - (sizeof(uint16_t) + sizeof(message_number) + 1);
switch (message_id) {
case GROUP_MESSAGE_PING_ID: {
if (msg_data_len != 0)
return;
g->group[index].last_recv = unix_time();
}
break;
case GROUP_MESSAGE_NEW_PEER_ID: {
if (msg_data_len != GROUP_MESSAGE_NEW_PEER_LENGTH)
return;
uint16_t new_peer_number;
memcpy(&new_peer_number, msg_data, sizeof(uint16_t));
new_peer_number = ntohs(new_peer_number);
addpeer(g_c, groupnumber, msg_data + sizeof(uint16_t), msg_data + sizeof(uint16_t) + crypto_box_PUBLICKEYBYTES,
new_peer_number);
}
break;
case GROUP_MESSAGE_KILL_PEER_ID: {
if (msg_data_len != GROUP_MESSAGE_KILL_PEER_LENGTH)
return;
uint16_t kill_peer_number;
memcpy(&kill_peer_number, msg_data, sizeof(uint16_t));
kill_peer_number = ntohs(kill_peer_number);
if (peer_number == kill_peer_number) {
delpeer(g_c, groupnumber, index);
} else {
//TODO
}
}
break;
case GROUP_MESSAGE_NAME_ID: {
if (setnick(g_c, groupnumber, index, msg_data, msg_data_len) == -1)
return;
}
break;
case PACKET_ID_MESSAGE: {
if (msg_data_len == 0)
return;
uint8_t newmsg[msg_data_len + 1];
memcpy(newmsg, msg_data, msg_data_len);
newmsg[msg_data_len] = 0;
//TODO
if (g_c->message_callback)
g_c->message_callback(g_c->m, groupnumber, index, newmsg, msg_data_len, g_c->message_callback_userdata);
break;
}
default:
return;
}
send_message_all_close(g_c, groupnumber, data, length, -1/*TODO close_index*/);
}
