/*
* Slightly better groupchats implementation.
*/
/*
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2014 Tox project.
*
* This file is part of Tox, the free peer to peer instant messenger.
*
* 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 .
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "group.h"
#include
#include
#include
#include "mono_time.h"
#include "state.h"
#include "util.h"
/**
* Packet type IDs as per the protocol specification.
*/
typedef enum Group_Message_Id {
GROUP_MESSAGE_PING_ID = 0,
GROUP_MESSAGE_NEW_PEER_ID = 16,
GROUP_MESSAGE_KILL_PEER_ID = 17,
GROUP_MESSAGE_FREEZE_PEER_ID = 18,
GROUP_MESSAGE_NAME_ID = 48,
GROUP_MESSAGE_TITLE_ID = 49,
} Group_Message_Id;
#define GROUP_MESSAGE_NEW_PEER_LENGTH (sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE * 2)
#define GROUP_MESSAGE_KILL_PEER_LENGTH (sizeof(uint16_t))
#define MAX_GROUP_MESSAGE_DATA_LEN (MAX_CRYPTO_DATA_SIZE - (1 + MIN_MESSAGE_PACKET_LEN))
typedef enum Invite_Id {
INVITE_ID = 0,
INVITE_RESPONSE_ID = 1,
} Invite_Id;
#define INVITE_PACKET_SIZE (1 + sizeof(uint16_t) + 1 + GROUP_ID_LENGTH)
#define INVITE_RESPONSE_PACKET_SIZE (1 + sizeof(uint16_t) * 2 + 1 + GROUP_ID_LENGTH)
#define ONLINE_PACKET_DATA_SIZE (sizeof(uint16_t) + 1 + GROUP_ID_LENGTH)
typedef enum Peer_Id {
PEER_INTRODUCED_ID = 1,
PEER_QUERY_ID = 8,
PEER_RESPONSE_ID = 9,
PEER_TITLE_ID = 10,
} Peer_Id;
#define MIN_MESSAGE_PACKET_LEN (sizeof(uint16_t) * 2 + sizeof(uint32_t) + 1)
/* return false if the groupnumber is not valid.
* return true if the groupnumber is valid.
*/
static bool is_groupnumber_valid(const Group_Chats *g_c, uint32_t groupnumber)
{
if (groupnumber >= g_c->num_chats) {
return false;
}
if (g_c->chats == nullptr) {
return false;
}
if (g_c->chats[groupnumber].status == GROUPCHAT_STATUS_NONE) {
return false;
}
return true;
}
/* Set the size of the groupchat list to num.
*
* return false if realloc fails.
* return true if it succeeds.
*/
static bool realloc_conferences(Group_Chats *g_c, uint16_t num)
{
if (num == 0) {
free(g_c->chats);
g_c->chats = nullptr;
return true;
}
Group_c *newgroup_chats = (Group_c *)realloc(g_c->chats, num * sizeof(Group_c));
if (newgroup_chats == nullptr) {
return false;
}
g_c->chats = newgroup_chats;
return true;
}
static void setup_conference(Group_c *g)
{
memset(g, 0, sizeof(Group_c));
g->maxfrozen = MAX_FROZEN_DEFAULT;
}
/* Create a new empty groupchat connection.
*
* return -1 on failure.
* return groupnumber on success.
*/
static int32_t create_group_chat(Group_Chats *g_c)
{
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
if (g_c->chats[i].status == GROUPCHAT_STATUS_NONE) {
return i;
}
}
int32_t id = -1;
if (realloc_conferences(g_c, g_c->num_chats + 1)) {
id = g_c->num_chats;
++g_c->num_chats;
setup_conference(&g_c->chats[id]);
}
return id;
}
/* Wipe a groupchat.
*
* return -1 on failure.
* return 0 on success.
*/
static int wipe_group_chat(Group_Chats *g_c, uint32_t groupnumber)
{
if (!is_groupnumber_valid(g_c, groupnumber)) {
return -1;
}
uint16_t i;
crypto_memzero(&g_c->chats[groupnumber], sizeof(Group_c));
for (i = g_c->num_chats; i != 0; --i) {
if (g_c->chats[i - 1].status != GROUPCHAT_STATUS_NONE) {
break;
}
}
if (g_c->num_chats != i) {
g_c->num_chats = i;
realloc_conferences(g_c, g_c->num_chats);
}
return 0;
}
static Group_c *get_group_c(const Group_Chats *g_c, uint32_t groupnumber)
{
if (!is_groupnumber_valid(g_c, groupnumber)) {
return nullptr;
}
return &g_c->chats[groupnumber];
}
/*
* check if peer with real_pk is in peer array.
*
* return peer index if peer is in chat.
* return -1 if peer is not in chat.
*
* TODO(irungentoo): make this more efficient.
*/
static int peer_in_chat(const Group_c *chat, const uint8_t *real_pk)
{
for (uint32_t i = 0; i < chat->numpeers; ++i) {
if (id_equal(chat->group[i].real_pk, real_pk)) {
return i;
}
}
return -1;
}
static int frozen_in_chat(const Group_c *chat, const uint8_t *real_pk)
{
for (uint32_t i = 0; i < chat->numfrozen; ++i) {
if (id_equal(chat->frozen[i].real_pk, real_pk)) {
return i;
}
}
return -1;
}
/*
* check if group with the given type and id is in group array.
*
* return group number if peer is in list.
* return -1 if group is not in list.
*
* TODO(irungentoo): make this more efficient and maybe use constant time comparisons?
*/
static int32_t get_group_num(const Group_Chats *g_c, const uint8_t type, const uint8_t *id)
{
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
if (g_c->chats[i].type == type && crypto_memcmp(g_c->chats[i].id, id, GROUP_ID_LENGTH) == 0) {
return i;
}
}
return -1;
}
int32_t conference_by_id(const Group_Chats *g_c, const uint8_t *id)
{
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
if (crypto_memcmp(g_c->chats[i].id, id, GROUP_ID_LENGTH) == 0) {
return i;
}
}
return -1;
}
/*
* check if peer with peer_number is in peer array.
*
* return peer index if peer is in chat.
* return -1 if peer is not in chat.
*
* TODO(irungentoo): make this more efficient.
*/
static int get_peer_index(const Group_c *g, uint16_t peer_number)
{
for (uint32_t i = 0; i < g->numpeers; ++i) {
if (g->group[i].peer_number == peer_number) {
return i;
}
}
return -1;
}
static uint64_t calculate_comp_value(const uint8_t *pk1, const uint8_t *pk2)
{
uint64_t cmp1 = 0, cmp2 = 0;
for (size_t i = 0; i < sizeof(uint64_t); ++i) {
cmp1 = (cmp1 << 8) + (uint64_t)pk1[i];
cmp2 = (cmp2 << 8) + (uint64_t)pk2[i];
}
return cmp1 - cmp2;
}
typedef enum Groupchat_Closest {
GROUPCHAT_CLOSEST_NONE,
GROUPCHAT_CLOSEST_ADDED,
GROUPCHAT_CLOSEST_REMOVED
} Groupchat_Closest;
static int add_to_closest(Group_Chats *g_c, uint32_t 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 (public_key_cmp(g->real_pk, real_pk) == 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 && public_key_cmp(real_pk, g->closest_peers[i].real_pk) == 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) {
uint64_t comp_val = calculate_comp_value(g->real_pk, real_pk);
uint64_t comp_d = 0;
for (i = 0; i < (DESIRED_CLOSE_CONNECTIONS / 2); ++i) {
uint64_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) {
uint64_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_PUBLIC_KEY_SIZE];
uint8_t old_temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
uint8_t old = 0;
if (g->closest_peers[index].entry) {
memcpy(old_real_pk, g->closest_peers[index].real_pk, CRYPTO_PUBLIC_KEY_SIZE);
memcpy(old_temp_pk, g->closest_peers[index].temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
old = 1;
}
g->closest_peers[index].entry = 1;
memcpy(g->closest_peers[index].real_pk, real_pk, CRYPTO_PUBLIC_KEY_SIZE);
memcpy(g->closest_peers[index].temp_pk, temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
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 unsigned int pk_in_closest_peers(const Group_c *g, uint8_t *real_pk)
{
unsigned int i;
for (i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
if (!g->closest_peers[i].entry) {
continue;
}
if (public_key_cmp(g->closest_peers[i].real_pk, real_pk) == 0) {
return 1;
}
}
return 0;
}
static int add_conn_to_groupchat(Group_Chats *g_c, int friendcon_id, uint32_t groupnumber, uint8_t reason,
uint8_t lock);
static void remove_conn_reason(Group_Chats *g_c, uint32_t groupnumber, uint16_t i, uint8_t reason);
static int send_packet_online(Friend_Connections *fr_c, int friendcon_id, uint16_t group_num, uint8_t type,
const uint8_t *id);
static int connect_to_closest(Group_Chats *g_c, uint32_t groupnumber, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (!g->changed) {
return 0;
}
if (g->changed == GROUPCHAT_CLOSEST_REMOVED) {
for (uint32_t i = 0; i < g->numpeers; ++i) {
add_to_closest(g_c, groupnumber, g->group[i].real_pk, g->group[i].temp_pk);
}
}
for (uint32_t i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE) {
continue;
}
if (!(g->close[i].reasons & GROUPCHAT_CLOSE_REASON_CLOSEST)) {
continue;
}
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE];
uint8_t dht_temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
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)) {
remove_conn_reason(g_c, groupnumber, i, GROUPCHAT_CLOSE_REASON_CLOSEST);
}
}
for (uint32_t 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);
uint8_t lock = 1;
if (friendcon_id == -1) {
friendcon_id = new_friend_connection(g_c->fr_c, g->closest_peers[i].real_pk);
lock = 0;
if (friendcon_id == -1) {
continue;
}
set_dht_temp_pk(g_c->fr_c, friendcon_id, g->closest_peers[i].temp_pk, userdata);
}
add_conn_to_groupchat(g_c, friendcon_id, groupnumber, GROUPCHAT_CLOSE_REASON_CLOSEST, lock);
if (friend_con_connected(g_c->fr_c, friendcon_id) == FRIENDCONN_STATUS_CONNECTED) {
send_packet_online(g_c->fr_c, friendcon_id, groupnumber, g->type, g->id);
}
}
g->changed = GROUPCHAT_CLOSEST_NONE;
return 0;
}
static int get_frozen_index(const Group_c *g, uint16_t peer_number)
{
for (uint32_t i = 0; i < g->numfrozen; ++i) {
if (g->frozen[i].peer_number == peer_number) {
return i;
}
}
return -1;
}
static bool delete_frozen(Group_c *g, uint32_t frozen_index)
{
if (frozen_index >= g->numfrozen) {
return false;
}
--g->numfrozen;
if (g->numfrozen == 0) {
free(g->frozen);
g->frozen = nullptr;
} else {
if (g->numfrozen != frozen_index) {
g->frozen[frozen_index] = g->frozen[g->numfrozen];
}
Group_Peer *const frozen_temp = (Group_Peer *)realloc(g->frozen, sizeof(Group_Peer) * (g->numfrozen));
if (frozen_temp == nullptr) {
return false;
}
g->frozen = frozen_temp;
}
return true;
}
/* Update last_active timestamp on peer, and thaw the peer if it is frozen.
*
* return peer index if peer is in the conference.
* return -1 otherwise, and on error.
*/
static int note_peer_active(Group_Chats *g_c, uint32_t groupnumber, uint16_t peer_number, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const int peer_index = get_peer_index(g, peer_number);
if (peer_index != -1) {
g->group[peer_index].last_active = mono_time_get(g_c->mono_time);
return peer_index;
}
const int frozen_index = get_frozen_index(g, peer_number);
if (frozen_index == -1) {
return -1;
}
/* Now thaw the peer */
Group_Peer *temp = (Group_Peer *)realloc(g->group, sizeof(Group_Peer) * (g->numpeers + 1));
if (temp == nullptr) {
return -1;
}
g->group = temp;
g->group[g->numpeers] = g->frozen[frozen_index];
g->group[g->numpeers].temp_pk_updated = false;
g->group[g->numpeers].last_active = mono_time_get(g_c->mono_time);
add_to_closest(g_c, groupnumber, g->group[g->numpeers].real_pk, g->group[g->numpeers].temp_pk);
++g->numpeers;
delete_frozen(g, frozen_index);
if (g_c->peer_list_changed_callback) {
g_c->peer_list_changed_callback(g_c->m, groupnumber, userdata);
}
if (g->peer_on_join) {
g->peer_on_join(g->object, groupnumber, g->numpeers - 1);
}
g->need_send_name = true;
return g->numpeers - 1;
}
static int delpeer(Group_Chats *g_c, uint32_t groupnumber, int peer_index, void *userdata, bool keep_connection);
static void delete_any_peer_with_pk(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *real_pk, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return;
}
const int prev_peer_index = peer_in_chat(g, real_pk);
if (prev_peer_index >= 0) {
delpeer(g_c, groupnumber, prev_peer_index, userdata, false);
}
const int prev_frozen_index = frozen_in_chat(g, real_pk);
if (prev_frozen_index >= 0) {
delete_frozen(g, prev_frozen_index);
}
}
/* Add a peer to the group chat, or update an existing peer.
*
* fresh indicates whether we should consider this information on the peer to
* be current, and so should update temp_pk and consider the peer active.
*
* do_gc_callback indicates whether we want to trigger callbacks set by the client
* via the public API. This should be set to false if this function is called
* from outside of the tox_iterate() loop.
*
* return peer_index if success or peer already in chat.
* return -1 if error.
*/
static int addpeer(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *real_pk, const uint8_t *temp_pk,
uint16_t peer_number, void *userdata, bool fresh, bool do_gc_callback)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const int peer_index = fresh ?
note_peer_active(g_c, groupnumber, peer_number, userdata) :
get_peer_index(g, peer_number);
if (peer_index != -1) {
if (!id_equal(g->group[peer_index].real_pk, real_pk)) {
return -1;
}
if (fresh || !g->group[peer_index].temp_pk_updated) {
id_copy(g->group[peer_index].temp_pk, temp_pk);
g->group[peer_index].temp_pk_updated = true;
}
return peer_index;
}
if (!fresh) {
const int frozen_index = get_frozen_index(g, peer_number);
if (frozen_index != -1) {
if (!id_equal(g->frozen[frozen_index].real_pk, real_pk)) {
return -1;
}
id_copy(g->frozen[frozen_index].temp_pk, temp_pk);
return -1;
}
}
delete_any_peer_with_pk(g_c, groupnumber, real_pk, userdata);
Group_Peer *temp = (Group_Peer *)realloc(g->group, sizeof(Group_Peer) * (g->numpeers + 1));
if (temp == nullptr) {
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].temp_pk_updated = true;
g->group[g->numpeers].peer_number = peer_number;
g->group[g->numpeers].last_active = mono_time_get(g_c->mono_time);
g->group[g->numpeers].is_friend = (getfriend_id(g_c->m, real_pk) != -1);
++g->numpeers;
add_to_closest(g_c, groupnumber, real_pk, temp_pk);
if (do_gc_callback && g_c->peer_list_changed_callback) {
g_c->peer_list_changed_callback(g_c->m, groupnumber, userdata);
}
if (g->peer_on_join) {
g->peer_on_join(g->object, groupnumber, g->numpeers - 1);
}
return g->numpeers - 1;
}
static int remove_close_conn(Group_Chats *g_c, uint32_t 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 == (unsigned int)friendcon_id) {
g->close[i].type = GROUPCHAT_CLOSE_NONE;
kill_friend_connection(g_c->fr_c, friendcon_id);
return 0;
}
}
return -1;
}
static void remove_from_closest(Group_c *g, int peer_index)
{
for (uint32_t i = 0; i < DESIRED_CLOSE_CONNECTIONS; ++i) {
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;
}
}
}
/*
* Delete a peer from the group chat.
*
* return 0 if success
* return -1 if error.
*/
static int delpeer(Group_Chats *g_c, uint32_t groupnumber, int peer_index, void *userdata, bool keep_connection)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
remove_from_closest(g, peer_index);
const int friendcon_id = getfriend_conn_id_pk(g_c->fr_c, g->group[peer_index].real_pk);
if (friendcon_id != -1 && !keep_connection) {
remove_close_conn(g_c, groupnumber, friendcon_id);
}
--g->numpeers;
void *peer_object = g->group[peer_index].object;
if (g->numpeers == 0) {
free(g->group);
g->group = nullptr;
} else {
if (g->numpeers != (uint32_t)peer_index) {
g->group[peer_index] = g->group[g->numpeers];
}
Group_Peer *temp = (Group_Peer *)realloc(g->group, sizeof(Group_Peer) * (g->numpeers));
if (temp == nullptr) {
return -1;
}
g->group = temp;
}
if (g_c->peer_list_changed_callback) {
g_c->peer_list_changed_callback(g_c->m, groupnumber, userdata);
}
if (g->peer_on_leave) {
g->peer_on_leave(g->object, groupnumber, peer_object);
}
return 0;
}
static int cmp_u64(uint64_t a, uint64_t b)
{
return (a > b) - (a < b);
}
/* Order peers with friends first and with more recently active earlier */
static int cmp_frozen(const void *a, const void *b)
{
const Group_Peer *pa = (const Group_Peer *) a;
const Group_Peer *pb = (const Group_Peer *) b;
if (pa->is_friend ^ pb->is_friend) {
return pa->is_friend ? -1 : 1;
}
return cmp_u64(pb->last_active, pa->last_active);
}
/* Delete frozen peers as necessary to ensure at most g->maxfrozen remain.
*
* return true if any frozen peers are removed.
*/
static bool delete_old_frozen(Group_c *g)
{
if (g->numfrozen <= g->maxfrozen) {
return false;
}
if (g->maxfrozen == 0) {
free(g->frozen);
g->frozen = nullptr;
g->numfrozen = 0;
return true;
}
qsort(g->frozen, g->numfrozen, sizeof(Group_Peer), cmp_frozen);
Group_Peer *temp = (Group_Peer *)realloc(g->frozen, sizeof(Group_Peer) * g->maxfrozen);
if (temp == nullptr) {
return false;
}
g->frozen = temp;
g->numfrozen = g->maxfrozen;
return true;
}
static bool try_send_rejoin(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *real_pk);
static int freeze_peer(Group_Chats *g_c, uint32_t groupnumber, int peer_index, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
Group_Peer *temp = (Group_Peer *)realloc(g->frozen, sizeof(Group_Peer) * (g->numfrozen + 1));
if (temp == nullptr) {
return -1;
}
g->frozen = temp;
g->frozen[g->numfrozen] = g->group[peer_index];
g->frozen[g->numfrozen].object = nullptr;
if (delpeer(g_c, groupnumber, peer_index, userdata, true) != 0) {
return -1;
}
try_send_rejoin(g_c, groupnumber, g->frozen[g->numfrozen].real_pk);
++g->numfrozen;
delete_old_frozen(g);
return 0;
}
/* Set the nick for a peer.
*
* do_gc_callback indicates whether we want to trigger callbacks set by the client
* via the public API. This should be set to false if this function is called
* from outside of the tox_iterate() loop.
*
* return 0 on success.
* return -1 if error.
*/
static int setnick(Group_Chats *g_c, uint32_t groupnumber, int peer_index, const uint8_t *nick, uint16_t nick_len,
void *userdata, bool do_gc_callback)
{
if (nick_len > MAX_NAME_LENGTH) {
return -1;
}
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->group[peer_index].nick_updated = true;
/* same name as already stored? */
if (g->group[peer_index].nick_len == nick_len) {
if (nick_len == 0 || !memcmp(g->group[peer_index].nick, nick, nick_len)) {
return 0;
}
}
if (nick_len) {
memcpy(g->group[peer_index].nick, nick, nick_len);
}
g->group[peer_index].nick_len = nick_len;
if (do_gc_callback && g_c->peer_name_callback) {
g_c->peer_name_callback(g_c->m, groupnumber, peer_index, nick, nick_len, userdata);
}
return 0;
}
static int settitle(Group_Chats *g_c, uint32_t groupnumber, int peer_index, const uint8_t *title, uint8_t title_len,
void *userdata)
{
if (title_len > MAX_NAME_LENGTH || title_len == 0) {
return -1;
}
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
/* same as already set? */
if (g->title_len == title_len && !memcmp(g->title, title, title_len)) {
return 0;
}
memcpy(g->title, title, title_len);
g->title_len = title_len;
g->title_fresh = true;
if (g_c->title_callback) {
g_c->title_callback(g_c->m, groupnumber, peer_index, title, title_len, userdata);
}
return 0;
}
/* Check if the group has no online connection, and freeze all peers if so */
static void check_disconnected(Group_Chats *g_c, uint32_t groupnumber, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return;
}
for (uint32_t i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_ONLINE) {
return;
}
}
for (uint32_t i = 0; i < g->numpeers; ++i) {
while (i < g->numpeers && !id_equal(g->group[i].real_pk, g->real_pk)) {
freeze_peer(g_c, groupnumber, i, userdata);
}
}
}
static void set_conns_type_close(Group_Chats *g_c, uint32_t groupnumber, int friendcon_id, uint8_t type, void *userdata)
{
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 != (unsigned int)friendcon_id) {
continue;
}
if (type == GROUPCHAT_CLOSE_ONLINE) {
send_packet_online(g_c->fr_c, friendcon_id, groupnumber, g->type, g->id);
} else {
g->close[i].type = type;
check_disconnected(g_c, groupnumber, userdata);
}
}
}
/* Set the type for all close connections with friendcon_id */
static void set_conns_status_groups(Group_Chats *g_c, int friendcon_id, uint8_t type, void *userdata)
{
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
set_conns_type_close(g_c, i, friendcon_id, type, userdata);
}
}
static void rejoin_frozen_friend(Group_Chats *g_c, int friendcon_id)
{
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE];
get_friendcon_public_keys(real_pk, nullptr, g_c->fr_c, friendcon_id);
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
Group_c *g = get_group_c(g_c, i);
if (!g) {
continue;
}
for (uint32_t j = 0; j < g->numfrozen; ++j) {
if (id_equal(g->frozen[j].real_pk, real_pk)) {
try_send_rejoin(g_c, i, real_pk);
break;
}
}
}
}
static int g_handle_any_status(void *object, int friendcon_id, uint8_t status, void *userdata)
{
Group_Chats *g_c = (Group_Chats *)object;
if (status) {
rejoin_frozen_friend(g_c, friendcon_id);
}
return 0;
}
static int g_handle_status(void *object, int friendcon_id, uint8_t status, void *userdata)
{
Group_Chats *g_c = (Group_Chats *)object;
if (status) { /* Went online */
set_conns_status_groups(g_c, friendcon_id, GROUPCHAT_CLOSE_ONLINE, userdata);
} else { /* Went offline */
set_conns_status_groups(g_c, friendcon_id, GROUPCHAT_CLOSE_CONNECTION, userdata);
// TODO(irungentoo): remove timedout connections?
}
return 0;
}
static int g_handle_packet(void *object, int friendcon_id, const uint8_t *data, uint16_t length, void *userdata);
static int handle_lossy(void *object, int friendcon_id, const uint8_t *data, uint16_t length, void *userdata);
/* 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, uint32_t groupnumber, uint8_t reason,
uint8_t lock)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
uint16_t empty = MAX_GROUP_CONNECTIONS;
uint16_t ind = MAX_GROUP_CONNECTIONS;
for (uint16_t i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE) {
empty = i;
continue;
}
if (g->close[i].number == (uint32_t)friendcon_id) {
ind = i; /* Already in list. */
break;
}
}
if (ind == MAX_GROUP_CONNECTIONS && empty != MAX_GROUP_CONNECTIONS) {
if (lock) {
friend_connection_lock(g_c->fr_c, friendcon_id);
}
g->close[empty].type = GROUPCHAT_CLOSE_CONNECTION;
g->close[empty].number = friendcon_id;
g->close[empty].reasons = 0;
// TODO(irungentoo):
friend_connection_callbacks(g_c->m->fr_c, friendcon_id, GROUPCHAT_CALLBACK_INDEX, &g_handle_status, &g_handle_packet,
&handle_lossy, g_c, friendcon_id);
ind = empty;
}
if (ind == MAX_GROUP_CONNECTIONS) {
return -1;
}
if (!(g->close[ind].reasons & reason)) {
g->close[ind].reasons |= reason;
if (reason == GROUPCHAT_CLOSE_REASON_INTRODUCER) {
++g->num_introducer_connections;
}
}
return ind;
}
static unsigned int send_peer_introduced(Group_Chats *g_c, int friendcon_id, uint16_t group_num);
/* Removes reason for keeping connection.
*
* Kills connection if this was the last reason.
*/
static void remove_conn_reason(Group_Chats *g_c, uint32_t groupnumber, uint16_t i, uint8_t reason)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return;
}
if (!(g->close[i].reasons & reason)) {
return;
}
g->close[i].reasons &= ~reason;
if (reason == GROUPCHAT_CLOSE_REASON_INTRODUCER) {
--g->num_introducer_connections;
if (g->close[i].type == GROUPCHAT_CLOSE_ONLINE) {
send_peer_introduced(g_c, g->close[i].number, g->close[i].group_number);
}
}
if (g->close[i].reasons == 0) {
kill_friend_connection(g_c->fr_c, g->close[i].number);
g->close[i].type = GROUPCHAT_CLOSE_NONE;
}
}
/* Creates a new groupchat and puts it in the chats array.
*
* type is one of GROUPCHAT_TYPE_*
*
* return group number on success.
* return -1 on failure.
*/
int add_groupchat(Group_Chats *g_c, uint8_t type)
{
const int32_t groupnumber = create_group_chat(g_c);
if (groupnumber == -1) {
return -1;
}
Group_c *g = &g_c->chats[groupnumber];
g->status = GROUPCHAT_STATUS_CONNECTED;
g->type = type;
new_symmetric_key(g->id);
g->peer_number = 0; /* Founder is peer 0. */
memcpy(g->real_pk, nc_get_self_public_key(g_c->m->net_crypto), CRYPTO_PUBLIC_KEY_SIZE);
const int peer_index = addpeer(g_c, groupnumber, g->real_pk, dht_get_self_public_key(g_c->m->dht), 0, nullptr, true,
false);
if (peer_index == -1) {
return -1;
}
setnick(g_c, groupnumber, peer_index, g_c->m->name, g_c->m->name_length, nullptr, false);
return groupnumber;
}
static bool group_leave(const Group_Chats *g_c, uint32_t groupnumber, bool permanent);
/* Delete a groupchat from the chats array, informing the group first as
* appropriate.
*
* return 0 on success.
* return -1 if groupnumber is invalid.
*/
int del_groupchat(Group_Chats *g_c, uint32_t groupnumber, bool leave_permanently)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
group_leave(g_c, groupnumber, leave_permanently);
for (uint32_t 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);
}
for (uint32_t i = 0; i < g->numpeers; ++i) {
if (g->peer_on_leave) {
g->peer_on_leave(g->object, groupnumber, g->group[i].object);
}
}
free(g->group);
free(g->frozen);
if (g->group_on_delete) {
g->group_on_delete(g->object, groupnumber);
}
return wipe_group_chat(g_c, groupnumber);
}
/* Copy the public key of (frozen, if frozen is true) peernumber who is in
* groupnumber to pk. pk must be CRYPTO_PUBLIC_KEY_SIZE long.
*
* return 0 on success
* return -1 if groupnumber is invalid.
* return -2 if peernumber is invalid.
*/
int group_peer_pubkey(const Group_Chats *g_c, uint32_t groupnumber, int peernumber, uint8_t *pk, bool frozen)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const Group_Peer *list = frozen ? g->frozen : g->group;
const uint32_t num = frozen ? g->numfrozen : g->numpeers;
if ((uint32_t)peernumber >= num) {
return -2;
}
memcpy(pk, list[peernumber].real_pk, CRYPTO_PUBLIC_KEY_SIZE);
return 0;
}
/*
* Return the size of (frozen, if frozen is true) peernumber's name.
*
* return -1 if groupnumber is invalid.
* return -2 if peernumber is invalid.
*/
int group_peername_size(const Group_Chats *g_c, uint32_t groupnumber, int peernumber, bool frozen)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const Group_Peer *list = frozen ? g->frozen : g->group;
const uint32_t num = frozen ? g->numfrozen : g->numpeers;
if ((uint32_t)peernumber >= num) {
return -2;
}
if (list[peernumber].nick_len == 0) {
return 0;
}
return list[peernumber].nick_len;
}
/* Copy the name of (frozen, if frozen is true) 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 groupnumber is invalid.
* return -2 if peernumber is invalid.
*/
int group_peername(const Group_Chats *g_c, uint32_t groupnumber, int peernumber, uint8_t *name, bool frozen)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const Group_Peer *list = frozen ? g->frozen : g->group;
const uint32_t num = frozen ? g->numfrozen : g->numpeers;
if ((uint32_t)peernumber >= num) {
return -2;
}
if (list[peernumber].nick_len == 0) {
return 0;
}
memcpy(name, list[peernumber].nick, list[peernumber].nick_len);
return list[peernumber].nick_len;
}
/* Copy last active timestamp of frozennumber who is in groupnumber to
* last_active.
*
* return 0 on success.
* return -1 if groupnumber is invalid.
* return -2 if frozennumber is invalid.
*/
int group_frozen_last_active(const Group_Chats *g_c, uint32_t groupnumber, int peernumber,
uint64_t *last_active)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if ((uint32_t)peernumber >= g->numfrozen) {
return -2;
}
*last_active = g->frozen[peernumber].last_active;
return 0;
}
/* Set maximum number of frozen peers.
*
* return 0 on success.
* return -1 if groupnumber is invalid.
*/
int group_set_max_frozen(const Group_Chats *g_c, uint32_t groupnumber, uint32_t maxfrozen)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->maxfrozen = maxfrozen;
delete_old_frozen(g);
return 0;
}
/* List all the (frozen, if frozen is true) 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, uint32_t groupnumber, uint8_t names[][MAX_NAME_LENGTH], uint16_t lengths[],
uint16_t length, bool frozen)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const uint32_t num = frozen ? g->numfrozen : g->numpeers;
unsigned int i;
for (i = 0; i < num && i < length; ++i) {
lengths[i] = group_peername(g_c, groupnumber, i, names[i], frozen);
}
return i;
}
/* Return the number of (frozen, if frozen is true) peers in the group chat on
* success.
* return -1 if groupnumber is invalid.
*/
int group_number_peers(const Group_Chats *g_c, uint32_t groupnumber, bool frozen)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
return frozen ? g->numfrozen : g->numpeers;
}
/* return 1 if the peernumber corresponds to ours.
* return 0 if the peernumber is not ours.
* return -1 if groupnumber is invalid.
* return -2 if peernumber is invalid.
* return -3 if we are not connected to the group chat.
*/
int group_peernumber_is_ours(const Group_Chats *g_c, uint32_t groupnumber, int peernumber)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if ((uint32_t)peernumber >= g->numpeers) {
return -2;
}
if (g->status != GROUPCHAT_STATUS_CONNECTED) {
return -3;
}
return g->peer_number == g->group[peernumber].peer_number;
}
/* return the type of groupchat (GROUPCHAT_TYPE_) that groupnumber is.
*
* return -1 on failure.
* return type on success.
*/
int group_get_type(const Group_Chats *g_c, uint32_t groupnumber)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
return g->type;
}
/* Copies the unique id of group_chat[groupnumber] into id.
*
* return false on failure.
* return true on success.
*/
bool conference_get_id(const Group_Chats *g_c, uint32_t groupnumber, uint8_t *id)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return false;
}
if (id != nullptr) {
memcpy(id, g->id, sizeof(g->id));
}
return true;
}
/* Send a group packet to friendcon_id.
*
* return 1 on success
* return 0 on failure
*/
static unsigned int send_packet_group_peer(Friend_Connections *fr_c, int friendcon_id, uint8_t packet_id,
uint16_t group_num, const uint8_t *data, uint16_t length)
{
if (1 + sizeof(uint16_t) + length > MAX_CRYPTO_DATA_SIZE) {
return 0;
}
group_num = net_htons(group_num);
VLA(uint8_t, packet, 1 + sizeof(uint16_t) + length);
packet[0] = packet_id;
memcpy(packet + 1, &group_num, sizeof(uint16_t));
memcpy(packet + 1 + sizeof(uint16_t), data, length);
return write_cryptpacket(friendconn_net_crypto(fr_c), friend_connection_crypt_connection_id(fr_c, friendcon_id), packet,
SIZEOF_VLA(packet), 0) != -1;
}
/* Send a group lossy packet to friendcon_id.
*
* return 1 on success
* return 0 on failure
*/
static unsigned int send_lossy_group_peer(Friend_Connections *fr_c, int friendcon_id, uint8_t packet_id,
uint16_t group_num, const uint8_t *data, uint16_t length)
{
if (1 + sizeof(uint16_t) + length > MAX_CRYPTO_DATA_SIZE) {
return 0;
}
group_num = net_htons(group_num);
VLA(uint8_t, packet, 1 + sizeof(uint16_t) + length);
packet[0] = packet_id;
memcpy(packet + 1, &group_num, sizeof(uint16_t));
memcpy(packet + 1 + sizeof(uint16_t), data, length);
return send_lossy_cryptpacket(friendconn_net_crypto(fr_c), friend_connection_crypt_connection_id(fr_c, friendcon_id),
packet, SIZEOF_VLA(packet)) != -1;
}
/* invite friendnumber to groupnumber.
*
* return 0 on success.
* return -1 if groupnumber is invalid.
* return -2 if invite packet failed to send.
* return -3 if we are not connected to the group chat.
*/
int invite_friend(Group_Chats *g_c, uint32_t friendnumber, uint32_t groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (g->status != GROUPCHAT_STATUS_CONNECTED) {
return -3;
}
uint8_t invite[INVITE_PACKET_SIZE];
invite[0] = INVITE_ID;
const uint16_t groupchat_num = net_htons((uint16_t)groupnumber);
memcpy(invite + 1, &groupchat_num, sizeof(groupchat_num));
invite[1 + sizeof(groupchat_num)] = g->type;
memcpy(invite + 1 + sizeof(groupchat_num) + 1, g->id, GROUP_ID_LENGTH);
if (send_conference_invite_packet(g_c->m, friendnumber, invite, sizeof(invite))) {
return 0;
}
return -2;
}
/* Send a rejoin packet to a peer if we have a friend connection to the peer.
* return true if a packet was sent.
* return false otherwise.
*/
static bool try_send_rejoin(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *real_pk)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return false;
}
const int friendcon_id = getfriend_conn_id_pk(g_c->fr_c, real_pk);
if (friendcon_id == -1) {
return false;
}
uint8_t packet[1 + 1 + GROUP_ID_LENGTH];
packet[0] = PACKET_ID_REJOIN_CONFERENCE;
packet[1] = g->type;
memcpy(packet + 2, g->id, GROUP_ID_LENGTH);
if (write_cryptpacket(friendconn_net_crypto(g_c->fr_c), friend_connection_crypt_connection_id(g_c->fr_c, friendcon_id),
packet, sizeof(packet), 0) == -1) {
return false;
}
add_conn_to_groupchat(g_c, friendcon_id, groupnumber, GROUPCHAT_CLOSE_REASON_INTRODUCER, 1);
return true;
}
static unsigned int send_peer_query(Group_Chats *g_c, int friendcon_id, uint16_t group_num);
/* Join a group (you need to have been invited first.)
*
* expected_type is the groupchat type we expect the chat we are joining is.
*
* return group number on success.
* return -1 if data length is invalid.
* return -2 if group is not the expected type.
* return -3 if friendnumber is invalid.
* return -4 if client is already in this group.
* return -5 if group instance failed to initialize.
* return -6 if join packet fails to send.
*/
int join_groupchat(Group_Chats *g_c, uint32_t friendnumber, uint8_t expected_type, const uint8_t *data, uint16_t length)
{
if (length != sizeof(uint16_t) + 1 + GROUP_ID_LENGTH) {
return -1;
}
if (data[sizeof(uint16_t)] != expected_type) {
return -2;
}
const int friendcon_id = getfriendcon_id(g_c->m, friendnumber);
if (friendcon_id == -1) {
return -3;
}
if (get_group_num(g_c, data[sizeof(uint16_t)], data + sizeof(uint16_t) + 1) != -1) {
return -4;
}
const int groupnumber = create_group_chat(g_c);
if (groupnumber == -1) {
return -5;
}
Group_c *g = &g_c->chats[groupnumber];
const uint16_t group_num = net_htons(groupnumber);
g->status = GROUPCHAT_STATUS_VALID;
memcpy(g->real_pk, nc_get_self_public_key(g_c->m->net_crypto), CRYPTO_PUBLIC_KEY_SIZE);
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) + 1 + GROUP_ID_LENGTH);
if (send_conference_invite_packet(g_c->m, friendnumber, response, sizeof(response))) {
uint16_t other_groupnum;
memcpy(&other_groupnum, data, sizeof(other_groupnum));
other_groupnum = net_ntohs(other_groupnum);
g->type = data[sizeof(uint16_t)];
memcpy(g->id, data + sizeof(uint16_t) + 1, GROUP_ID_LENGTH);
const int close_index = add_conn_to_groupchat(g_c, friendcon_id, groupnumber, GROUPCHAT_CLOSE_REASON_INTRODUCER, 1);
if (close_index != -1) {
g->close[close_index].group_number = other_groupnum;
g->close[close_index].type = GROUPCHAT_CLOSE_ONLINE;
}
send_peer_query(g_c, friendcon_id, other_groupnum);
return groupnumber;
}
g->status = GROUPCHAT_STATUS_NONE;
return -6;
}
/* Set handlers for custom lossy packets. */
void group_lossy_packet_registerhandler(Group_Chats *g_c, uint8_t byte, lossy_packet_cb *function)
{
g_c->lossy_packethandlers[byte].function = function;
}
/* Set the callback for group invites. */
void g_callback_group_invite(Group_Chats *g_c, g_conference_invite_cb *function)
{
g_c->invite_callback = function;
}
/* Set the callback for group connection. */
void g_callback_group_connected(Group_Chats *g_c, g_conference_connected_cb *function)
{
g_c->connected_callback = function;
}
/* Set the callback for group messages. */
void g_callback_group_message(Group_Chats *g_c, g_conference_message_cb *function)
{
g_c->message_callback = function;
}
/* Set callback function for peer nickname changes.
*
* It gets called every time a peer changes their nickname.
*/
void g_callback_peer_name(Group_Chats *g_c, peer_name_cb *function)
{
g_c->peer_name_callback = function;
}
/* Set callback function for peer list changes.
*
* It gets called every time the name list changes(new peer, deleted peer)
*/
void g_callback_peer_list_changed(Group_Chats *g_c, peer_list_changed_cb *function)
{
g_c->peer_list_changed_callback = function;
}
/* Set callback function for title changes. */
void g_callback_group_title(Group_Chats *g_c, title_cb *function)
{
g_c->title_callback = function;
}
/* Set a function to be called when a new peer joins a group chat.
*
* return 0 on success.
* return -1 on failure.
*/
int callback_groupchat_peer_new(const Group_Chats *g_c, uint32_t groupnumber, peer_on_join_cb *function)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->peer_on_join = function;
return 0;
}
/* Set a function to be called when a peer leaves a group chat.
*
* return 0 on success.
* return -1 on failure.
*/
int callback_groupchat_peer_delete(Group_Chats *g_c, uint32_t groupnumber, peer_on_leave_cb *function)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->peer_on_leave = function;
return 0;
}
/* Set a function to be called when the group chat is deleted.
*
* return 0 on success.
* return -1 on failure.
*/
int callback_groupchat_delete(Group_Chats *g_c, uint32_t groupnumber, group_on_delete_cb *function)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->group_on_delete = function;
return 0;
}
static int send_message_group(const Group_Chats *g_c, uint32_t groupnumber, uint8_t message_id, const uint8_t *data,
uint16_t len);
static int group_ping_send(const Group_Chats *g_c, uint32_t groupnumber)
{
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_PING_ID, nullptr, 0) > 0) {
return 0;
}
return -1;
}
/* send a new_peer message
* return 0 on success
* return -1 on failure
*/
static int group_new_peer_send(const Group_Chats *g_c, uint32_t groupnumber, uint16_t peer_num, const uint8_t *real_pk,
uint8_t *temp_pk)
{
uint8_t packet[GROUP_MESSAGE_NEW_PEER_LENGTH];
peer_num = net_htons(peer_num);
memcpy(packet, &peer_num, sizeof(uint16_t));
memcpy(packet + sizeof(uint16_t), real_pk, CRYPTO_PUBLIC_KEY_SIZE);
memcpy(packet + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE, temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_NEW_PEER_ID, packet, sizeof(packet)) > 0) {
return 0;
}
return -1;
}
/* send a kill_peer message
* return true on success
*/
static bool group_kill_peer_send(const Group_Chats *g_c, uint32_t groupnumber, uint16_t peer_num)
{
uint8_t packet[GROUP_MESSAGE_KILL_PEER_LENGTH];
peer_num = net_htons(peer_num);
memcpy(packet, &peer_num, sizeof(uint16_t));
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_KILL_PEER_ID, packet, sizeof(packet)) > 0) {
return true;
}
return false;
}
/* send a freeze_peer message
* return true on success
*/
static bool group_freeze_peer_send(const Group_Chats *g_c, uint32_t groupnumber, uint16_t peer_num)
{
uint8_t packet[GROUP_MESSAGE_KILL_PEER_LENGTH];
peer_num = net_htons(peer_num);
memcpy(packet, &peer_num, sizeof(uint16_t));
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_FREEZE_PEER_ID, packet, sizeof(packet)) > 0) {
return true;
}
return false;
}
/* send a name message
* return 0 on success
* return -1 on failure
*/
static int group_name_send(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *nick, uint16_t nick_len)
{
if (nick_len > MAX_NAME_LENGTH) {
return -1;
}
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_NAME_ID, nick, nick_len) > 0) {
return 0;
}
return -1;
}
/* send message to announce leaving group
* return true on success
*/
static bool group_leave(const Group_Chats *g_c, uint32_t groupnumber, bool permanent)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return false;
}
if (permanent) {
return group_kill_peer_send(g_c, groupnumber, g->peer_number);
} else {
return group_freeze_peer_send(g_c, groupnumber, g->peer_number);
}
}
/* set the group's title, limited to MAX_NAME_LENGTH
* return 0 on success
* return -1 if groupnumber is invalid.
* return -2 if title is too long or empty.
* return -3 if packet fails to send.
*/
int group_title_send(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *title, uint8_t title_len)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (title_len > MAX_NAME_LENGTH || title_len == 0) {
return -2;
}
/* same as already set? */
if (g->title_len == title_len && !memcmp(g->title, title, title_len)) {
return 0;
}
memcpy(g->title, title, title_len);
g->title_len = title_len;
if (g->numpeers == 1) {
return 0;
}
if (send_message_group(g_c, groupnumber, GROUP_MESSAGE_TITLE_ID, title, title_len) > 0) {
return 0;
}
return -3;
}
/* return the group's title size.
* return -1 of groupnumber is invalid.
* return -2 if title is too long or empty.
*/
int group_title_get_size(const Group_Chats *g_c, uint32_t groupnumber)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (g->title_len == 0 || g->title_len > MAX_NAME_LENGTH) {
return -2;
}
return g->title_len;
}
/* Get group title from groupnumber and put it in title.
* Title needs to be a valid memory location with a size of at least MAX_NAME_LENGTH (128) bytes.
*
* return length of copied title if success.
* return -1 if groupnumber is invalid.
* return -2 if title is too long or empty.
*/
int group_title_get(const Group_Chats *g_c, uint32_t groupnumber, uint8_t *title)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (g->title_len == 0 || g->title_len > MAX_NAME_LENGTH) {
return -2;
}
memcpy(title, g->title, g->title_len);
return g->title_len;
}
static bool get_peer_number(const Group_c *g, const uint8_t *real_pk, uint16_t *peer_number)
{
const int peer_index = peer_in_chat(g, real_pk);
if (peer_index >= 0) {
*peer_number = g->group[peer_index].peer_number;
return true;
}
const int frozen_index = frozen_in_chat(g, real_pk);
if (frozen_index >= 0) {
*peer_number = g->frozen[frozen_index].peer_number;
return true;
}
return false;
}
static void handle_friend_invite_packet(Messenger *m, uint32_t friendnumber, const uint8_t *data, uint16_t length,
void *userdata)
{
Group_Chats *g_c = m->conferences_object;
if (length <= 1) {
return;
}
const uint8_t *invite_data = data + 1;
const uint16_t invite_length = length - 1;
switch (data[0]) {
case INVITE_ID: {
if (length != INVITE_PACKET_SIZE) {
return;
}
const int groupnumber = get_group_num(g_c, data[1 + sizeof(uint16_t)], data + 1 + sizeof(uint16_t) + 1);
if (groupnumber == -1) {
if (g_c->invite_callback) {
g_c->invite_callback(m, friendnumber, invite_data[sizeof(uint16_t)], invite_data, invite_length, 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 = net_ntohs(groupnum);
Group_c *g = get_group_c(g_c, groupnum);
if (!g) {
return;
}
if (data[1 + sizeof(uint16_t) * 2] != g->type) {
return;
}
if (crypto_memcmp(data + 1 + sizeof(uint16_t) * 2 + 1, g->id, GROUP_ID_LENGTH) != 0) {
return;
}
/* TODO(irungentoo): what if two people enter the group at the same time and
are given the same peer_number by different nodes? */
uint16_t peer_number = random_u16();
unsigned int tries = 0;
while (get_peer_index(g, peer_number) != -1 || get_frozen_index(g, peer_number) != -1) {
peer_number = random_u16();
++tries;
if (tries > 32) {
return;
}
}
memcpy(&other_groupnum, data + 1, sizeof(uint16_t));
other_groupnum = net_ntohs(other_groupnum);
const int friendcon_id = getfriendcon_id(m, friendnumber);
if (friendcon_id == -1) {
// TODO(iphydf): Log something?
return;
}
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE], temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
get_friendcon_public_keys(real_pk, temp_pk, g_c->fr_c, friendcon_id);
addpeer(g_c, groupnum, real_pk, temp_pk, peer_number, userdata, true, true);
const int close_index = add_conn_to_groupchat(g_c, friendcon_id, groupnum, GROUPCHAT_CLOSE_REASON_INTRODUCING, 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;
}
}
/* Find index of friend in the close list;
*
* returns index on success
* returns -1 on failure.
*/
static int friend_in_close(const Group_c *g, int friendcon_id)
{
unsigned int i;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE) {
continue;
}
if (g->close[i].number != (uint32_t)friendcon_id) {
continue;
}
return i;
}
return -1;
}
/* return number of connected close connections.
*/
static unsigned int count_close_connected(const Group_c *g)
{
unsigned int i, count = 0;
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_ONLINE) {
++count;
}
}
return count;
}
static int send_packet_online(Friend_Connections *fr_c, int friendcon_id, uint16_t group_num, uint8_t type,
const uint8_t *id)
{
uint8_t packet[1 + ONLINE_PACKET_DATA_SIZE];
group_num = net_htons(group_num);
packet[0] = PACKET_ID_ONLINE_PACKET;
memcpy(packet + 1, &group_num, sizeof(uint16_t));
packet[1 + sizeof(uint16_t)] = type;
memcpy(packet + 1 + sizeof(uint16_t) + 1, id, GROUP_ID_LENGTH);
return write_cryptpacket(friendconn_net_crypto(fr_c), friend_connection_crypt_connection_id(fr_c, friendcon_id), packet,
sizeof(packet), 0) != -1;
}
static int ping_groupchat(Group_Chats *g_c, uint32_t groupnumber);
static int handle_packet_online(Group_Chats *g_c, int friendcon_id, const uint8_t *data, uint16_t length)
{
if (length != ONLINE_PACKET_DATA_SIZE) {
return -1;
}
const int groupnumber = get_group_num(g_c, data[sizeof(uint16_t)], data + sizeof(uint16_t) + 1);
if (groupnumber == -1) {
return -1;
}
uint16_t other_groupnum;
memcpy(&other_groupnum, data, sizeof(uint16_t));
other_groupnum = net_ntohs(other_groupnum);
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const int index = friend_in_close(g, friendcon_id);
if (index == -1) {
return -1;
}
if (g->close[index].type == GROUPCHAT_CLOSE_ONLINE) {
return -1;
}
if (count_close_connected(g) == 0 || (g->close[index].reasons & GROUPCHAT_CLOSE_REASON_INTRODUCER)) {
send_peer_query(g_c, friendcon_id, other_groupnum);
}
g->close[index].group_number = other_groupnum;
g->close[index].type = GROUPCHAT_CLOSE_ONLINE;
send_packet_online(g_c->fr_c, friendcon_id, groupnumber, g->type, g->id);
if (g->close[index].reasons & GROUPCHAT_CLOSE_REASON_INTRODUCING) {
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE], temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
get_friendcon_public_keys(real_pk, temp_pk, g_c->fr_c, friendcon_id);
const int peer_index = peer_in_chat(g, real_pk);
if (peer_index != -1) {
group_new_peer_send(g_c, groupnumber, g->group[peer_index].peer_number, real_pk, temp_pk);
}
g->need_send_name = true;
}
ping_groupchat(g_c, groupnumber);
return 0;
}
static int handle_packet_rejoin(Group_Chats *g_c, int friendcon_id, const uint8_t *data, uint16_t length,
void *userdata)
{
if (length < 1 + GROUP_ID_LENGTH) {
return -1;
}
const int32_t groupnum = get_group_num(g_c, *data, data + 1);
const Group_c *g = get_group_c(g_c, groupnum);
if (!g) {
return -1;
}
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE], temp_pk[CRYPTO_PUBLIC_KEY_SIZE];
get_friendcon_public_keys(real_pk, temp_pk, g_c->fr_c, friendcon_id);
uint16_t peer_number;
if (!get_peer_number(g, real_pk, &peer_number)) {
return -1;
}
addpeer(g_c, groupnum, real_pk, temp_pk, peer_number, userdata, true, true);
const int close_index = add_conn_to_groupchat(g_c, friendcon_id, groupnum, GROUPCHAT_CLOSE_REASON_INTRODUCING, 1);
if (close_index != -1) {
send_packet_online(g_c->fr_c, friendcon_id, groupnum, g->type, g->id);
}
return 0;
}
// we could send title with invite, but then if it changes between sending and accepting inv, joinee won't see it
/* return 1 on success.
* return 0 on failure
*/
static unsigned int send_peer_introduced(Group_Chats *g_c, int friendcon_id, uint16_t group_num)
{
uint8_t packet[1];
packet[0] = PEER_INTRODUCED_ID;
return send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_CONFERENCE, group_num, packet, sizeof(packet));
}
/* return 1 on success.
* return 0 on failure
*/
static unsigned int send_peer_query(Group_Chats *g_c, int friendcon_id, uint16_t group_num)
{
uint8_t packet[1];
packet[0] = PEER_QUERY_ID;
return send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_CONFERENCE, group_num, packet, sizeof(packet));
}
/* return number of peers sent on success.
* return 0 on failure.
*/
static unsigned int send_peers(Group_Chats *g_c, uint32_t groupnumber, int friendcon_id, uint16_t group_num)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return 0;
}
uint8_t response_packet[MAX_CRYPTO_DATA_SIZE - (1 + sizeof(uint16_t))];
response_packet[0] = PEER_RESPONSE_ID;
uint8_t *p = response_packet + 1;
uint16_t sent = 0;
uint32_t i;
for (i = 0; i < g->numpeers; ++i) {
if ((p - response_packet) + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE * 2 + 1 + g->group[i].nick_len > sizeof(
response_packet)) {
if (send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_CONFERENCE, group_num, response_packet,
(p - response_packet))) {
sent = i;
} else {
return sent;
}
p = response_packet + 1;
}
const uint16_t peer_num = net_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_PUBLIC_KEY_SIZE);
p += CRYPTO_PUBLIC_KEY_SIZE;
memcpy(p, g->group[i].temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
p += CRYPTO_PUBLIC_KEY_SIZE;
*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_CONFERENCE, group_num, response_packet,
(p - response_packet))) {
sent = i;
}
}
if (g->title_len) {
VLA(uint8_t, title_packet, 1 + g->title_len);
title_packet[0] = PEER_TITLE_ID;
memcpy(title_packet + 1, g->title, g->title_len);
send_packet_group_peer(g_c->fr_c, friendcon_id, PACKET_ID_DIRECT_CONFERENCE, group_num, title_packet,
SIZEOF_VLA(title_packet));
}
return sent;
}
static int handle_send_peers(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *data, uint16_t length,
void *userdata)
{
if (length == 0) {
return -1;
}
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const uint8_t *d = data;
while ((unsigned int)(length - (d - data)) >= sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE * 2 + 1) {
uint16_t peer_num;
memcpy(&peer_num, d, sizeof(peer_num));
peer_num = net_ntohs(peer_num);
d += sizeof(uint16_t);
if (g->status == GROUPCHAT_STATUS_VALID
&& public_key_cmp(d, nc_get_self_public_key(g_c->m->net_crypto)) == 0) {
g->peer_number = peer_num;
g->status = GROUPCHAT_STATUS_CONNECTED;
if (g_c->connected_callback) {
g_c->connected_callback(g_c->m, groupnumber, userdata);
}
g->need_send_name = true;
}
const int peer_index = addpeer(g_c, groupnumber, d, d + CRYPTO_PUBLIC_KEY_SIZE, peer_num, userdata, false, true);
if (peer_index == -1) {
return -1;
}
d += CRYPTO_PUBLIC_KEY_SIZE * 2;
const uint8_t name_length = *d;
d += 1;
if (name_length > (length - (d - data)) || name_length > MAX_NAME_LENGTH) {
return -1;
}
if (!g->group[peer_index].nick_updated) {
setnick(g_c, groupnumber, peer_index, d, name_length, userdata, true);
}
d += name_length;
}
return 0;
}
static void handle_direct_packet(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *data, uint16_t length,
int close_index, void *userdata)
{
if (length == 0) {
return;
}
switch (data[0]) {
case PEER_INTRODUCED_ID: {
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return;
}
remove_conn_reason(g_c, groupnumber, close_index, GROUPCHAT_CLOSE_REASON_INTRODUCING);
}
break;
case PEER_QUERY_ID: {
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return;
}
if (g->close[close_index].type != GROUPCHAT_CLOSE_ONLINE) {
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, userdata);
}
break;
case PEER_TITLE_ID: {
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
break;
}
if (!g->title_fresh) {
settitle(g_c, groupnumber, -1, data + 1, length - 1, userdata);
}
}
break;
}
}
/* 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, uint32_t groupnumber, const uint8_t *data,
uint16_t length, int receiver)
{
const 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_CONFERENCE, g->close[i].group_number, data,
length)) {
++sent;
}
}
return sent;
}
/* Send lossy 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_lossy_all_close(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *data,
uint16_t length,
int receiver)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return 0;
}
unsigned int i, sent = 0, num_connected_closest = 0, connected_closest[DESIRED_CLOSE_CONNECTIONS];
for (i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type != GROUPCHAT_CLOSE_ONLINE) {
continue;
}
if ((int)i == receiver) {
continue;
}
if (g->close[i].reasons & GROUPCHAT_CLOSE_REASON_CLOSEST) {
connected_closest[num_connected_closest] = i;
++num_connected_closest;
continue;
}
if (send_lossy_group_peer(g_c->fr_c, g->close[i].number, PACKET_ID_LOSSY_CONFERENCE, g->close[i].group_number, data,
length)) {
++sent;
}
}
if (!num_connected_closest) {
return sent;
}
unsigned int to_send = 0;
uint64_t comp_val_old = ~0;
for (i = 0; i < num_connected_closest; ++i) {
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE] = {0};
uint8_t dht_temp_pk[CRYPTO_PUBLIC_KEY_SIZE] = {0};
get_friendcon_public_keys(real_pk, dht_temp_pk, g_c->fr_c, g->close[connected_closest[i]].number);
const uint64_t comp_val = calculate_comp_value(g->real_pk, real_pk);
if (comp_val < comp_val_old) {
to_send = connected_closest[i];
comp_val_old = comp_val;
}
}
if (send_lossy_group_peer(g_c->fr_c, g->close[to_send].number, PACKET_ID_LOSSY_CONFERENCE,
g->close[to_send].group_number, data, length)) {
++sent;
}
unsigned int to_send_other = 0;
comp_val_old = ~0;
for (i = 0; i < num_connected_closest; ++i) {
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE] = {0};
uint8_t dht_temp_pk[CRYPTO_PUBLIC_KEY_SIZE] = {0};
get_friendcon_public_keys(real_pk, dht_temp_pk, g_c->fr_c, g->close[connected_closest[i]].number);
const uint64_t comp_val = calculate_comp_value(real_pk, g->real_pk);
if (comp_val < comp_val_old) {
to_send_other = connected_closest[i];
comp_val_old = comp_val;
}
}
if (to_send_other == to_send) {
return sent;
}
if (send_lossy_group_peer(g_c->fr_c, g->close[to_send_other].number, PACKET_ID_LOSSY_CONFERENCE,
g->close[to_send_other].group_number, data, length)) {
++sent;
}
return sent;
}
/* Send data of len with message_id to groupnumber.
*
* return number of peers it was sent to on success.
* return -1 if groupnumber is invalid.
* return -2 if message is too long.
* return -3 if we are not connected to the group.
* return -4 if message failed to send.
*/
static int send_message_group(const Group_Chats *g_c, uint32_t groupnumber, uint8_t message_id, const uint8_t *data,
uint16_t len)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (len > MAX_GROUP_MESSAGE_DATA_LEN) {
return -2;
}
if (g->status != GROUPCHAT_STATUS_CONNECTED || count_close_connected(g) == 0) {
return -3;
}
VLA(uint8_t, packet, sizeof(uint16_t) + sizeof(uint32_t) + 1 + len);
const uint16_t peer_num = net_htons(g->peer_number);
memcpy(packet, &peer_num, sizeof(peer_num));
++g->message_number;
if (!g->message_number) {
++g->message_number;
}
const uint32_t message_num = net_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);
}
unsigned int ret = send_message_all_close(g_c, groupnumber, packet, SIZEOF_VLA(packet), -1);
return (ret == 0) ? -4 : ret;
}
/* send a group message
* return 0 on success
* see: send_message_group() for error codes.
*/
int group_message_send(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *message, uint16_t length)
{
const int ret = send_message_group(g_c, groupnumber, PACKET_ID_MESSAGE, message, length);
if (ret > 0) {
return 0;
}
return ret;
}
/* send a group action
* return 0 on success
* see: send_message_group() for error codes.
*/
int group_action_send(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *action, uint16_t length)
{
const int ret = send_message_group(g_c, groupnumber, PACKET_ID_ACTION, action, length);
if (ret > 0) {
return 0;
}
return ret;
}
/* High level function to send custom lossy packets.
*
* return -1 on failure.
* return 0 on success.
*/
int send_group_lossy_packet(const Group_Chats *g_c, uint32_t groupnumber, const uint8_t *data, uint16_t length)
{
// TODO(irungentoo): length check here?
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
VLA(uint8_t, packet, sizeof(uint16_t) * 2 + length);
const uint16_t peer_number = net_htons(g->peer_number);
memcpy(packet, &peer_number, sizeof(uint16_t));
const uint16_t message_num = net_htons(g->lossy_message_number);
memcpy(packet + sizeof(uint16_t), &message_num, sizeof(uint16_t));
memcpy(packet + sizeof(uint16_t) * 2, data, length);
if (send_lossy_all_close(g_c, groupnumber, packet, SIZEOF_VLA(packet), -1) == 0) {
return -1;
}
++g->lossy_message_number;
return 0;
}
static Message_Info *find_message_slot_or_reject(uint32_t message_number, uint8_t message_id, Group_Peer *peer)
{
const bool ignore_older = (message_id == GROUP_MESSAGE_NAME_ID || message_id == GROUP_MESSAGE_TITLE_ID);
Message_Info *i;
for (i = peer->last_message_infos; i < peer->last_message_infos + peer->num_last_message_infos; ++i) {
if (message_number > i->message_number) {
break;
}
if (message_number == i->message_number) {
return nullptr;
}
if (ignore_older && message_id == i->message_id) {
return nullptr;
}
}
return i;
}
/* Stores message info in peer->last_message_infos.
*
* return true if message should be processed;
* return false otherwise.
*/
static bool check_message_info(uint32_t message_number, uint8_t message_id, Group_Peer *peer)
{
Message_Info *const i = find_message_slot_or_reject(message_number, message_id, peer);
if (i == nullptr) {
return false;
}
if (i == peer->last_message_infos + MAX_LAST_MESSAGE_INFOS) {
return false;
}
if (peer->num_last_message_infos < MAX_LAST_MESSAGE_INFOS) {
++peer->num_last_message_infos;
}
memmove(i + 1, i, ((peer->last_message_infos + peer->num_last_message_infos - 1) - i) * sizeof(Message_Info));
i->message_number = message_number;
i->message_id = message_id;
return true;
}
static void handle_message_packet_group(Group_Chats *g_c, uint32_t groupnumber, const uint8_t *data, uint16_t length,
int close_index, void *userdata)
{
if (length < sizeof(uint16_t) + sizeof(uint32_t) + 1) {
return;
}
const 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 = net_ntohs(peer_number);
uint32_t message_number;
memcpy(&message_number, data + sizeof(uint16_t), sizeof(message_number));
message_number = net_ntohl(message_number);
const uint8_t message_id = data[sizeof(uint16_t) + sizeof(message_number)];
const uint8_t *msg_data = data + sizeof(uint16_t) + sizeof(message_number) + 1;
const uint16_t msg_data_len = length - (sizeof(uint16_t) + sizeof(message_number) + 1);
const bool ignore_frozen = message_id == GROUP_MESSAGE_FREEZE_PEER_ID;
const int index = ignore_frozen ? get_peer_index(g, peer_number)
: note_peer_active(g_c, groupnumber, peer_number, userdata);
if (index == -1) {
if (ignore_frozen) {
return;
}
if (g->close[close_index].type != GROUPCHAT_CLOSE_ONLINE) {
return;
}
/* If we don't know the peer this packet came from, then we query the
* list of peers from the relaying peer.
* (They would not have relayed it if they didn't know the peer.) */
send_peer_query(g_c, g->close[close_index].number, g->close[close_index].group_number);
return;
}
if (g->num_introducer_connections > 0 && count_close_connected(g) > DESIRED_CLOSE_CONNECTIONS) {
for (uint32_t i = 0; i < MAX_GROUP_CONNECTIONS; ++i) {
if (g->close[i].type == GROUPCHAT_CLOSE_NONE
|| !(g->close[i].reasons & GROUPCHAT_CLOSE_REASON_INTRODUCER)
|| i == close_index) {
continue;
}
uint8_t real_pk[CRYPTO_PUBLIC_KEY_SIZE];
get_friendcon_public_keys(real_pk, nullptr, g_c->fr_c, g->close[i].number);
if (id_equal(g->group[index].real_pk, real_pk)) {
/* Received message from peer relayed via another peer, so
* the introduction was successful */
remove_conn_reason(g_c, groupnumber, i, GROUPCHAT_CLOSE_REASON_INTRODUCER);
}
}
}
if (!check_message_info(message_number, message_id, &g->group[index])) {
return;
}
switch (message_id) {
case GROUP_MESSAGE_PING_ID:
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 = net_ntohs(new_peer_number);
addpeer(g_c, groupnumber, msg_data + sizeof(uint16_t), msg_data + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE,
new_peer_number, userdata, true, true);
}
break;
case GROUP_MESSAGE_KILL_PEER_ID:
case GROUP_MESSAGE_FREEZE_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 = net_ntohs(kill_peer_number);
if (peer_number == kill_peer_number) {
if (message_id == GROUP_MESSAGE_KILL_PEER_ID) {
delpeer(g_c, groupnumber, index, userdata, false);
} else {
freeze_peer(g_c, groupnumber, index, userdata);
}
} else {
return;
// TODO(irungentoo):
}
}
break;
case GROUP_MESSAGE_NAME_ID: {
if (setnick(g_c, groupnumber, index, msg_data, msg_data_len, userdata, true) == -1) {
return;
}
}
break;
case GROUP_MESSAGE_TITLE_ID: {
if (settitle(g_c, groupnumber, index, msg_data, msg_data_len, userdata) == -1) {
return;
}
}
break;
case PACKET_ID_MESSAGE: {
if (msg_data_len == 0) {
return;
}
VLA(uint8_t, newmsg, msg_data_len + 1);
memcpy(newmsg, msg_data, msg_data_len);
newmsg[msg_data_len] = 0;
// TODO(irungentoo):
if (g_c->message_callback) {
g_c->message_callback(g_c->m, groupnumber, index, 0, newmsg, msg_data_len, userdata);
}
break;
}
case PACKET_ID_ACTION: {
if (msg_data_len == 0) {
return;
}
VLA(uint8_t, newmsg, msg_data_len + 1);
memcpy(newmsg, msg_data, msg_data_len);
newmsg[msg_data_len] = 0;
// TODO(irungentoo):
if (g_c->message_callback) {
g_c->message_callback(g_c->m, groupnumber, index, 1, newmsg, msg_data_len, userdata);
}
break;
}
default:
return;
}
send_message_all_close(g_c, groupnumber, data, length, -1/* TODO(irungentoo) close_index */);
}
static int g_handle_packet(void *object, int friendcon_id, const uint8_t *data, uint16_t length, void *userdata)
{
Group_Chats *g_c = (Group_Chats *)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_REJOIN_CONFERENCE) {
return handle_packet_rejoin(g_c, friendcon_id, data + 1, length - 1, userdata);
}
if (data[0] != PACKET_ID_DIRECT_CONFERENCE && data[0] != PACKET_ID_MESSAGE_CONFERENCE) {
return -1;
}
uint16_t groupnumber;
memcpy(&groupnumber, data + 1, sizeof(uint16_t));
groupnumber = net_ntohs(groupnumber);
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
const int index = friend_in_close(g, friendcon_id);
if (index == -1) {
return -1;
}
switch (data[0]) {
case PACKET_ID_DIRECT_CONFERENCE: {
handle_direct_packet(g_c, groupnumber, data + 1 + sizeof(uint16_t), length - (1 + sizeof(uint16_t)), index, userdata);
break;
}
case PACKET_ID_MESSAGE_CONFERENCE: {
handle_message_packet_group(g_c, groupnumber, data + 1 + sizeof(uint16_t), length - (1 + sizeof(uint16_t)), index,
userdata);
break;
}
default: {
return 0;
}
}
return 0;
}
/* Did we already receive the lossy packet or not.
*
* return -1 on failure.
* return 0 if packet was not received.
* return 1 if packet was received.
*
* TODO(irungentoo): test this
*/
static unsigned int lossy_packet_not_received(const Group_c *g, int peer_index, uint16_t message_number)
{
if (peer_index == -1) {
// TODO(sudden6): invalid return value
return -1;
}
if (g->group[peer_index].bottom_lossy_number == g->group[peer_index].top_lossy_number) {
g->group[peer_index].top_lossy_number = message_number;
g->group[peer_index].bottom_lossy_number = (message_number - MAX_LOSSY_COUNT) + 1;
g->group[peer_index].recv_lossy[message_number % MAX_LOSSY_COUNT] = 1;
return 0;
}
if ((uint16_t)(message_number - g->group[peer_index].bottom_lossy_number) < MAX_LOSSY_COUNT) {
if (g->group[peer_index].recv_lossy[message_number % MAX_LOSSY_COUNT]) {
return 1;
}
g->group[peer_index].recv_lossy[message_number % MAX_LOSSY_COUNT] = 1;
return 0;
}
if ((uint16_t)(message_number - g->group[peer_index].bottom_lossy_number) > (1 << 15)) {
// TODO(sudden6): invalid return value
return -1;
}
const uint16_t top_distance = message_number - g->group[peer_index].top_lossy_number;
if (top_distance >= MAX_LOSSY_COUNT) {
crypto_memzero(g->group[peer_index].recv_lossy, sizeof(g->group[peer_index].recv_lossy));
g->group[peer_index].top_lossy_number = message_number;
g->group[peer_index].bottom_lossy_number = (message_number - MAX_LOSSY_COUNT) + 1;
g->group[peer_index].recv_lossy[message_number % MAX_LOSSY_COUNT] = 1;
} else { // top_distance < MAX_LOSSY_COUNT
for (unsigned int i = g->group[peer_index].bottom_lossy_number;
i != g->group[peer_index].bottom_lossy_number + top_distance;
++i) {
g->group[peer_index].recv_lossy[i % MAX_LOSSY_COUNT] = 0;
}
g->group[peer_index].top_lossy_number = message_number;
g->group[peer_index].bottom_lossy_number = (message_number - MAX_LOSSY_COUNT) + 1;
g->group[peer_index].recv_lossy[message_number % MAX_LOSSY_COUNT] = 1;
}
return 0;
}
/* Does this group type make use of lossy packets? */
static bool type_uses_lossy(uint8_t type)
{
return (type == GROUPCHAT_TYPE_AV);
}
static int handle_lossy(void *object, int friendcon_id, const uint8_t *data, uint16_t length, void *userdata)
{
Group_Chats *g_c = (Group_Chats *)object;
if (length < 1 + sizeof(uint16_t) * 3 + 1) {
return -1;
}
if (data[0] != PACKET_ID_LOSSY_CONFERENCE) {
return -1;
}
uint16_t groupnumber, peer_number, message_number;
memcpy(&groupnumber, data + 1, sizeof(uint16_t));
memcpy(&peer_number, data + 1 + sizeof(uint16_t), sizeof(uint16_t));
memcpy(&message_number, data + 1 + sizeof(uint16_t) * 2, sizeof(uint16_t));
groupnumber = net_ntohs(groupnumber);
peer_number = net_ntohs(peer_number);
message_number = net_ntohs(message_number);
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (!type_uses_lossy(g->type)) {
return -1;
}
const int index = friend_in_close(g, friendcon_id);
if (index == -1) {
return -1;
}
if (peer_number == g->peer_number) {
return -1;
}
const int peer_index = get_peer_index(g, peer_number);
if (peer_index == -1) {
return -1;
}
if (lossy_packet_not_received(g, peer_index, message_number)) {
return -1;
}
const uint8_t *lossy_data = data + 1 + sizeof(uint16_t) * 3;
uint16_t lossy_length = length - (1 + sizeof(uint16_t) * 3);
const uint8_t message_id = lossy_data[0];
++lossy_data;
--lossy_length;
send_lossy_all_close(g_c, groupnumber, data + 1 + sizeof(uint16_t), length - (1 + sizeof(uint16_t)), index);
if (g_c->lossy_packethandlers[message_id].function) {
if (g_c->lossy_packethandlers[message_id].function(g->object, groupnumber, peer_index, g->group[peer_index].object,
lossy_data, lossy_length) == -1) {
return -1;
}
} else {
return -1;
}
return 0;
}
/* Set the object that is tied to the group chat.
*
* return 0 on success.
* return -1 on failure
*/
int group_set_object(const Group_Chats *g_c, uint32_t groupnumber, void *object)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
g->object = object;
return 0;
}
/* Set the object that is tied to the group peer.
*
* return 0 on success.
* return -1 on failure
*/
int group_peer_set_object(const Group_Chats *g_c, uint32_t groupnumber, int peernumber, void *object)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if ((uint32_t)peernumber >= g->numpeers) {
return -1;
}
g->group[peernumber].object = object;
return 0;
}
/* Return the object tied to the group chat previously set by group_set_object.
*
* return NULL on failure.
* return object on success.
*/
void *group_get_object(const Group_Chats *g_c, uint32_t groupnumber)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return nullptr;
}
return g->object;
}
/* Return the object tied to the group chat peer previously set by group_peer_set_object.
*
* return NULL on failure.
* return object on success.
*/
void *group_peer_get_object(const Group_Chats *g_c, uint32_t groupnumber, int peernumber)
{
const Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return nullptr;
}
if ((uint32_t)peernumber >= g->numpeers) {
return nullptr;
}
return g->group[peernumber].object;
}
/* Interval in seconds to send ping messages */
#define GROUP_PING_INTERVAL 20
static int ping_groupchat(Group_Chats *g_c, uint32_t groupnumber)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
if (mono_time_is_timeout(g_c->mono_time, g->last_sent_ping, GROUP_PING_INTERVAL)) {
if (group_ping_send(g_c, groupnumber) != -1) { /* Ping */
g->last_sent_ping = mono_time_get(g_c->mono_time);
}
}
return 0;
}
static int groupchat_freeze_timedout(Group_Chats *g_c, uint32_t groupnumber, void *userdata)
{
Group_c *g = get_group_c(g_c, groupnumber);
if (!g) {
return -1;
}
for (uint32_t i = 0; i < g->numpeers; ++i) {
if (g->group[i].peer_number == g->peer_number) {
continue;
}
if (mono_time_is_timeout(g_c->mono_time, g->group[i].last_active, GROUP_PING_INTERVAL * 3)) {
freeze_peer(g_c, groupnumber, i, userdata);
}
}
if (g->numpeers <= 1) {
g->title_fresh = false;
}
return 0;
}
/* Send current name (set in messenger) to all online groups.
*/
void send_name_all_groups(Group_Chats *g_c)
{
for (uint16_t 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);
g->need_send_name = false;
}
}
}
#define SAVED_PEER_SIZE_CONSTANT (2 * CRYPTO_PUBLIC_KEY_SIZE + sizeof(uint16_t) + sizeof(uint64_t) + 1)
static uint32_t saved_peer_size(const Group_Peer *peer)
{
return SAVED_PEER_SIZE_CONSTANT + peer->nick_len;
}
static uint8_t *save_peer(const Group_Peer *peer, uint8_t *data)
{
memcpy(data, peer->real_pk, CRYPTO_PUBLIC_KEY_SIZE);
data += CRYPTO_PUBLIC_KEY_SIZE;
memcpy(data, peer->temp_pk, CRYPTO_PUBLIC_KEY_SIZE);
data += CRYPTO_PUBLIC_KEY_SIZE;
host_to_lendian_bytes16(data, peer->peer_number);
data += sizeof(uint16_t);
host_to_lendian_bytes64(data, peer->last_active);
data += sizeof(uint64_t);
*data = peer->nick_len;
++data;
memcpy(data, peer->nick, peer->nick_len);
data += peer->nick_len;
return data;
}
#define SAVED_CONF_SIZE_CONSTANT (1 + GROUP_ID_LENGTH + sizeof(uint32_t) \
+ sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t) + 1)
static uint32_t saved_conf_size(const Group_c *g)
{
uint32_t len = SAVED_CONF_SIZE_CONSTANT + g->title_len;
for (uint32_t j = 0; j < g->numpeers + g->numfrozen; ++j) {
const Group_Peer *peer = (j < g->numpeers) ? &g->group[j] : &g->frozen[j - g->numpeers];
if (id_equal(peer->real_pk, g->real_pk)) {
continue;
}
len += saved_peer_size(peer);
}
return len;
}
static uint8_t *save_conf(const Group_c *g, uint8_t *data)
{
*data = g->type;
++data;
memcpy(data, g->id, GROUP_ID_LENGTH);
data += GROUP_ID_LENGTH;
host_to_lendian_bytes32(data, g->message_number);
data += sizeof(uint32_t);
host_to_lendian_bytes16(data, g->lossy_message_number);
data += sizeof(uint16_t);
host_to_lendian_bytes16(data, g->peer_number);
data += sizeof(uint16_t);
uint8_t *const numsaved_location = data;
data += sizeof(uint32_t);
*data = g->title_len;
++data;
memcpy(data, g->title, g->title_len);
data += g->title_len;
uint32_t numsaved = 0;
for (uint32_t j = 0; j < g->numpeers + g->numfrozen; ++j) {
const Group_Peer *peer = (j < g->numpeers) ? &g->group[j] : &g->frozen[j - g->numpeers];
if (id_equal(peer->real_pk, g->real_pk)) {
continue;
}
data = save_peer(peer, data);
++numsaved;
}
host_to_lendian_bytes32(numsaved_location, numsaved);
return data;
}
static uint32_t conferences_section_size(const Group_Chats *g_c)
{
uint32_t len = 0;
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
const Group_c *g = get_group_c(g_c, i);
if (!g || g->status != GROUPCHAT_STATUS_CONNECTED) {
continue;
}
len += saved_conf_size(g);
}
return len;
}
uint32_t conferences_size(const Group_Chats *g_c)
{
return 2 * sizeof(uint32_t) + conferences_section_size(g_c);
}
uint8_t *conferences_save(const Group_Chats *g_c, uint8_t *data)
{
const uint32_t len = conferences_section_size(g_c);
data = state_write_section_header(data, STATE_COOKIE_TYPE, len, STATE_TYPE_CONFERENCES);
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
const Group_c *g = get_group_c(g_c, i);
if (!g || g->status != GROUPCHAT_STATUS_CONNECTED) {
continue;
}
data = save_conf(g, data);
}
return data;
}
static State_Load_Status load_conferences(Group_Chats *g_c, const uint8_t *data, uint32_t length)
{
const uint8_t *init_data = data;
while (length >= (uint32_t)(data - init_data) + SAVED_CONF_SIZE_CONSTANT) {
const int groupnumber = create_group_chat(g_c);
if (groupnumber == -1) {
return STATE_LOAD_STATUS_ERROR;
}
Group_c *g = &g_c->chats[groupnumber];
g->type = *data;
++data;
memcpy(g->id, data, GROUP_ID_LENGTH);
data += GROUP_ID_LENGTH;
lendian_bytes_to_host32(&g->message_number, data);
data += sizeof(uint32_t);
lendian_bytes_to_host16(&g->lossy_message_number, data);
data += sizeof(uint16_t);
lendian_bytes_to_host16(&g->peer_number, data);
data += sizeof(uint16_t);
lendian_bytes_to_host32(&g->numfrozen, data);
data += sizeof(uint32_t);
if (g->numfrozen > 0) {
g->frozen = (Group_Peer *)malloc(sizeof(Group_Peer) * g->numfrozen);
if (g->frozen == nullptr) {
return STATE_LOAD_STATUS_ERROR;
}
}
g->title_len = *data;
++data;
if (length < (uint32_t)(data - init_data) + g->title_len) {
return STATE_LOAD_STATUS_ERROR;
}
memcpy(g->title, data, g->title_len);
data += g->title_len;
for (uint32_t j = 0; j < g->numfrozen; ++j) {
if (length < (uint32_t)(data - init_data) + SAVED_PEER_SIZE_CONSTANT) {
return STATE_LOAD_STATUS_ERROR;
}
Group_Peer *peer = &g->frozen[j];
memset(peer, 0, sizeof(Group_Peer));
id_copy(peer->real_pk, data);
data += CRYPTO_PUBLIC_KEY_SIZE;
id_copy(peer->temp_pk, data);
data += CRYPTO_PUBLIC_KEY_SIZE;
lendian_bytes_to_host16(&peer->peer_number, data);
data += sizeof(uint16_t);
lendian_bytes_to_host64(&peer->last_active, data);
data += sizeof(uint64_t);
peer->nick_len = *data;
++data;
if (length < (uint32_t)(data - init_data) + peer->nick_len) {
return STATE_LOAD_STATUS_ERROR;
}
memcpy(peer->nick, data, peer->nick_len);
data += peer->nick_len;
// NOTE: this relies on friends being loaded before conferences.
peer->is_friend = (getfriend_id(g_c->m, peer->real_pk) != -1);
}
if (g->numfrozen > g->maxfrozen) {
g->maxfrozen = g->numfrozen;
}
g->status = GROUPCHAT_STATUS_CONNECTED;
memcpy(g->real_pk, nc_get_self_public_key(g_c->m->net_crypto), CRYPTO_PUBLIC_KEY_SIZE);
const int peer_index = addpeer(g_c, groupnumber, g->real_pk, dht_get_self_public_key(g_c->m->dht), g->peer_number,
nullptr, true, false);
if (peer_index == -1) {
return STATE_LOAD_STATUS_ERROR;
}
setnick(g_c, groupnumber, peer_index, g_c->m->name, g_c->m->name_length, nullptr, false);
}
return STATE_LOAD_STATUS_CONTINUE;
}
bool conferences_load_state_section(Group_Chats *g_c, const uint8_t *data, uint32_t length, uint16_t type,
State_Load_Status *status)
{
if (type != STATE_TYPE_CONFERENCES) {
return false;
}
*status = load_conferences(g_c, data, length);
return true;
}
/* Create new groupchat instance. */
Group_Chats *new_groupchats(Mono_Time *mono_time, Messenger *m)
{
if (!m) {
return nullptr;
}
Group_Chats *temp = (Group_Chats *)calloc(1, sizeof(Group_Chats));
if (temp == nullptr) {
return nullptr;
}
temp->mono_time = mono_time;
temp->m = m;
temp->fr_c = m->fr_c;
m->conferences_object = temp;
m_callback_conference_invite(m, &handle_friend_invite_packet);
set_global_status_callback(m->fr_c, &g_handle_any_status, temp);
return temp;
}
/* main groupchats loop. */
void do_groupchats(Group_Chats *g_c, void *userdata)
{
for (uint16_t 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, userdata);
ping_groupchat(g_c, i);
groupchat_freeze_timedout(g_c, i, userdata);
if (g->need_send_name) {
group_name_send(g_c, i, g_c->m->name, g_c->m->name_length);
g->need_send_name = false;
}
}
}
// TODO(irungentoo):
}
/* Free everything related with group chats. */
void kill_groupchats(Group_Chats *g_c)
{
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
del_groupchat(g_c, i, false);
}
m_callback_conference_invite(g_c->m, nullptr);
g_c->m->conferences_object = nullptr;
free(g_c);
}
/* Return the number of chats in the instance m.
* You should use this to determine how much memory to allocate
* for copy_chatlist.
*/
uint32_t count_chatlist(const Group_Chats *g_c)
{
uint32_t ret = 0;
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
if (g_c->chats[i].status != GROUPCHAT_STATUS_NONE) {
++ret;
}
}
return ret;
}
/* Copy a list of valid chat IDs into the array out_list.
* If out_list is NULL, returns 0.
* Otherwise, returns the number of elements copied.
* If the array was too small, the contents
* of out_list will be truncated to list_size. */
uint32_t copy_chatlist(const Group_Chats *g_c, uint32_t *out_list, uint32_t list_size)
{
if (!out_list) {
return 0;
}
if (g_c->num_chats == 0) {
return 0;
}
uint32_t ret = 0;
for (uint16_t i = 0; i < g_c->num_chats; ++i) {
if (ret >= list_size) {
break; /* Abandon ship */
}
if (g_c->chats[i].status > GROUPCHAT_STATUS_NONE) {
out_list[ret] = i;
++ret;
}
}
return ret;
}