Green Sky
0ce5c0a0ad
e740b4e3b2e feat: Implement Tox network profiler git-subtree-dir: external/toxcore/c-toxcore git-subtree-split: e740b4e3b2e3aa594ab259e2a80153f5eed8fd16
129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2019-2022 The TokTok team.
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*/
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#ifndef C_TOXCORE_TOXCORE_FORWARDING_H
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#define C_TOXCORE_TOXCORE_FORWARDING_H
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#include "DHT.h"
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#include "attributes.h"
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#include "crypto_core.h"
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#include "logger.h"
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#include "mono_time.h"
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#include "network.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SENDBACK_IPPORT 0
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#define SENDBACK_FORWARD 1
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#define SENDBACK_TCP 2
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#define MAX_SENDBACK_SIZE (0xff - 1)
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#define MAX_FORWARD_DATA_SIZE (MAX_UDP_PACKET_SIZE - (1 + 1 + MAX_SENDBACK_SIZE))
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#define MAX_FORWARD_CHAIN_LENGTH 4
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#define MAX_PACKED_IPPORT_SIZE (1 + SIZE_IP6 + sizeof(uint16_t))
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typedef struct Forwarding Forwarding;
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non_null()
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DHT *forwarding_get_dht(const Forwarding *forwarding);
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/**
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* @brief Send data to forwarder for forwarding via chain of dht nodes.
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* Destination is last key in the chain.
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*
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* @param data Must be of length at most MAX_FORWARD_DATA_SIZE.
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* @param chain_length Number of intermediate nodes in chain.
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* Must be at least 1 and at most MAX_FORWARD_CHAIN_LENGTH.
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* @param chain_keys Public keys of chain nodes. Must be of length
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* `chain_length * CRYPTO_PUBLIC_KEY_SIZE`.
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*
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* @return true on success, false otherwise.
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*/
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non_null()
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bool send_forward_request(Networking_Core *net, const IP_Port *forwarder,
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const uint8_t *chain_keys, uint16_t chain_length,
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const uint8_t *data, uint16_t data_length);
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/** Returns size of packet written by create_forward_chain_packet. */
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uint16_t forward_chain_packet_size(uint16_t chain_length, uint16_t data_length);
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/**
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* @brief Create forward request packet for forwarding data via chain of dht nodes.
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* Destination is last key in the chain.
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*
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* @param data Must be of length at most MAX_FORWARD_DATA_SIZE.
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* @param chain_length Number of intermediate nodes in chain.
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* Must be at least 1 and at most MAX_FORWARD_CHAIN_LENGTH.
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* @param chain_keys Public keys of chain nodes. Must be of length
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* `chain_length * CRYPTO_PUBLIC_KEY_SIZE`.
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* @param packet Must be of size at least
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* `forward_chain_packet_size(chain_length, data_length)` bytes.
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*
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* @return true on success, false otherwise.
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*/
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non_null()
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bool create_forward_chain_packet(const uint8_t *chain_keys, uint16_t chain_length,
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const uint8_t *data, uint16_t data_length,
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uint8_t *packet);
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/**
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* @brief Send reply to forwarded packet via forwarder.
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* @param sendback Must be of size at most MAX_SENDBACK_SIZE.
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* @param data Must be of size at most MAX_FORWARD_DATA_SIZE.
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*
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* @return true on success, false otherwise.
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*/
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non_null()
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bool forward_reply(Networking_Core *net, const IP_Port *forwarder,
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const uint8_t *sendback, uint16_t sendback_length,
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const uint8_t *data, uint16_t length);
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/**
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* @brief Set callback to handle a forwarded request.
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* To reply to the packet, callback should use `forward_reply()` to send a reply
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* forwarded via forwarder, passing the provided sendback.
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*/
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typedef void forwarded_request_cb(void *object, const IP_Port *forwarder, const uint8_t *sendback,
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uint16_t sendback_length, const uint8_t *data,
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uint16_t length, void *userdata);
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non_null(1) nullable(2, 3)
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void set_callback_forwarded_request(Forwarding *forwarding, forwarded_request_cb *function, void *object);
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/** @brief Set callback to handle a forwarded response. */
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typedef void forwarded_response_cb(void *object, const uint8_t *data, uint16_t length, void *userdata);
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non_null(1) nullable(2, 3)
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void set_callback_forwarded_response(Forwarding *forwarding, forwarded_response_cb *function, void *object);
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/** @brief Send forwarding packet to dest with given sendback data and data. */
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non_null(1, 2, 5) nullable(3)
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bool send_forwarding(const Forwarding *forwarding, const IP_Port *dest,
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const uint8_t *sendback_data, uint16_t sendback_data_len,
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const uint8_t *data, uint16_t length);
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typedef bool forward_reply_cb(void *object, const uint8_t *sendback_data, uint16_t sendback_data_len,
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const uint8_t *data, uint16_t length);
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/**
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* @brief Set callback to handle a forward reply with an otherwise unhandled
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* sendback.
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*/
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non_null(1) nullable(2, 3)
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void set_callback_forward_reply(Forwarding *forwarding, forward_reply_cb *function, void *object);
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non_null()
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Forwarding *new_forwarding(const Logger *log, const Random *rng, const Mono_Time *mono_time, DHT *dht);
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nullable(1)
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void kill_forwarding(Forwarding *forwarding);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* C_TOXCORE_TOXCORE_FORWARDING_H */
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