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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2020 The TokTok team.
* Copyright © 2015 Tox project.
*/
#include "group_onion_announce.h"
#include <assert.h>
#include <string.h>
#include "DHT.h"
#include "attributes.h"
#include "ccompat.h"
#include "crypto_core.h"
#include "group_announce.h"
#include "logger.h"
#include "mono_time.h"
#include "network.h"
#include "onion_announce.h"
#include "timed_auth.h"
static_assert(GCA_ANNOUNCE_MAX_SIZE <= ONION_MAX_EXTRA_DATA_SIZE,
"GC_Announce does not fit into the onion packet extra data");
static pack_extra_data_cb pack_group_announces;
non_null()
static int pack_group_announces(void *object, const Logger *logger, const Mono_Time *mono_time,
uint8_t num_nodes, uint8_t *plain, uint16_t plain_size,
uint8_t *response, uint16_t response_size, uint16_t offset)
{
GC_Announces_List *gc_announces_list = (GC_Announces_List *)object;
GC_Public_Announce public_announce;
if (gca_unpack_public_announce(logger, plain, plain_size,
&public_announce) == -1) {
LOGGER_WARNING(logger, "Failed to unpack public group announce");
return -1;
}
const GC_Peer_Announce *new_announce = gca_add_announce(mono_time, gc_announces_list, &public_announce);
if (new_announce == nullptr) {
LOGGER_ERROR(logger, "Failed to add group announce");
return -1;
}
GC_Announce gc_announces[GCA_MAX_SENT_ANNOUNCES];
const int num_ann = gca_get_announces(gc_announces_list,
gc_announces,
GCA_MAX_SENT_ANNOUNCES,
public_announce.chat_public_key,
new_announce->base_announce.peer_public_key);
if (num_ann < 0) {
LOGGER_ERROR(logger, "failed to get group announce");
return -1;
}
assert(num_ann <= UINT8_MAX);
size_t announces_length = 0;
if (gca_pack_announces_list(logger, response + offset, response_size - offset, gc_announces, (uint8_t)num_ann,
&announces_length) != num_ann) {
LOGGER_WARNING(logger, "Failed to pack group announces list");
return -1;
}
return announces_length;
}
void gca_onion_init(GC_Announces_List *group_announce, Onion_Announce *onion_a)
{
onion_announce_extra_data_callback(onion_a, GCA_MAX_SENT_ANNOUNCES * sizeof(GC_Announce), pack_group_announces,
group_announce);
}
int create_gca_announce_request(
const Random *rng, uint8_t *packet, uint16_t max_packet_length, const uint8_t *dest_client_id,
const uint8_t *public_key, const uint8_t *secret_key, const uint8_t *ping_id,
const uint8_t *client_id, const uint8_t *data_public_key, uint64_t sendback_data,
const uint8_t *gc_data, uint16_t gc_data_length)
{
if (max_packet_length < ONION_ANNOUNCE_REQUEST_MAX_SIZE || gc_data_length == 0) {
return -1;
}
uint8_t plain[ONION_PING_ID_SIZE + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_PUBLIC_KEY_SIZE +
ONION_ANNOUNCE_SENDBACK_DATA_LENGTH + GCA_ANNOUNCE_MAX_SIZE];
uint8_t *position_in_plain = plain;
const size_t encrypted_size = sizeof(plain) - GCA_ANNOUNCE_MAX_SIZE + gc_data_length;
memcpy(plain, ping_id, ONION_PING_ID_SIZE);
position_in_plain += ONION_PING_ID_SIZE;
memcpy(position_in_plain, client_id, CRYPTO_PUBLIC_KEY_SIZE);
position_in_plain += CRYPTO_PUBLIC_KEY_SIZE;
memcpy(position_in_plain, data_public_key, CRYPTO_PUBLIC_KEY_SIZE);
position_in_plain += CRYPTO_PUBLIC_KEY_SIZE;
memcpy(position_in_plain, &sendback_data, sizeof(sendback_data));
position_in_plain += sizeof(sendback_data);
memcpy(position_in_plain, gc_data, gc_data_length);
packet[0] = NET_PACKET_ANNOUNCE_REQUEST;
random_nonce(rng, packet + 1);
memcpy(packet + 1 + CRYPTO_NONCE_SIZE, public_key, CRYPTO_PUBLIC_KEY_SIZE);
const int len = encrypt_data(dest_client_id, secret_key, packet + 1, plain,
encrypted_size, packet + 1 + CRYPTO_NONCE_SIZE + CRYPTO_PUBLIC_KEY_SIZE);
const uint32_t full_length = (uint32_t)len + 1 + CRYPTO_NONCE_SIZE + CRYPTO_PUBLIC_KEY_SIZE;
if (full_length != ONION_ANNOUNCE_REQUEST_MIN_SIZE + gc_data_length) {
return -1;
}
return full_length;
}
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