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;
}
/* Join a group (you need to have been invited first.)
*
* returns group number on success
* returns -1 on failure.
*/
int join_groupchat(Group_Chats *g_c, int32_t friendnumber, const uint8_t *data, uint16_t length)
{
if (length != sizeof(uint16_t) + GROUP_IDENTIFIER_LENGTH)
return -1;
int friendcon_id = getfriendcon_id(g_c->m, friendnumber);
if (friendcon_id == -1)
return -1;
int groupnumber = create_group_chat(g_c);
if (groupnumber == -1)
return -1;
Group_c *g = &g_c->chats[groupnumber];
uint16_t group_num = htons(groupnumber);
g->status = GROUPCHAT_STATUS_VALID;
g->number_joined = -1;
memcpy(g->real_pk, g_c->m->net_crypto->self_public_key, crypto_box_PUBLICKEYBYTES);
uint8_t response[INVITE_RESPONSE_PACKET_SIZE];
response[0] = INVITE_RESPONSE_ID;
memcpy(response + 1, &group_num, sizeof(uint16_t));
memcpy(response + 1 + sizeof(uint16_t), data, sizeof(uint16_t) + GROUP_IDENTIFIER_LENGTH);
if (send_group_invite_packet(g_c->m, friendnumber, response, sizeof(response))) {
uint16_t other_groupnum;
memcpy(&other_groupnum, data, sizeof(other_groupnum));
other_groupnum = ntohs(other_groupnum);
memcpy(g->identifier, data + sizeof(uint16_t), GROUP_IDENTIFIER_LENGTH);
int close_index = add_conn_to_groupchat(g_c, friendcon_id, groupnumber, 0, 1);
if (close_index != -1) {
g->close[close_index].group_number = other_groupnum;
g->close[close_index].type = GROUPCHAT_CLOSE_ONLINE;
g->number_joined = friendcon_id;
}
send_peer_query(g_c, friendcon_id, other_groupnum);
return groupnumber;
} else {
g->status = GROUPCHAT_STATUS_NONE;
return -1;
}
}
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;
}
}
