Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

toxcore/group_onion_announce.c

@@ -0,0 +1,115 @@
+/* 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 "ccompat.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);
+}
+
+#ifndef VANILLA_NACL
+
+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;
+}
+#endif  // VANILLA_NACL