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nbnet.h
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/*
Copyright (C) 2023 BIAGINI Nathan
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#ifndef NBNET_H
#define NBNET_H
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <limits.h>
#include <math.h>
#include <assert.h>
#ifndef NBN_Allocator
#define NBN_Allocator malloc
#endif
#ifndef NBN_Reallocator
#define NBN_Reallocator realloc
#endif
#ifndef NBN_Deallocator
#define NBN_Deallocator free
#endif
#pragma region Declarations
#ifndef NBN_Abort
#define NBN_Abort abort
#endif /* NBN_Abort */
#define NBN_ERROR -1
typedef struct NBN_Endpoint NBN_Endpoint;
typedef struct NBN_Connection NBN_Connection;
typedef struct NBN_Channel NBN_Channel;
typedef struct NBN_Driver NBN_Driver;
#pragma region NBN_ConnectionVector
typedef struct NBN_ConnectionVector
{
NBN_Connection **connections;
unsigned int count;
unsigned int capacity;
} NBN_ConnectionVector;
#pragma endregion // NBN_ConnectionVector
#pragma region Memory management
enum
{
NBN_MEM_MESSAGE_CHUNK,
NBN_MEM_BYTE_ARRAY_MESSAGE,
NBN_MEM_CONNECTION,
#if defined(NBN_DEBUG) && defined(NBN_USE_PACKET_SIMULATOR)
NBN_MEM_PACKET_SIMULATOR_ENTRY
#endif
};
typedef struct NBN_MemPoolFreeBlock
{
struct NBN_MemPoolFreeBlock *next;
} NBN_MemPoolFreeBlock;
typedef struct NBN_MemPool
{
uint8_t **blocks;
size_t block_size;
unsigned int block_count;
unsigned int block_idx;
NBN_MemPoolFreeBlock *free;
} NBN_MemPool;
typedef struct NBN_MemoryManager
{
#ifdef NBN_DISABLE_MEMORY_POOLING
size_t mem_sizes[16];
#else
NBN_MemPool mem_pools[16];
#endif /* NBN_DISABLE_MEMORY_POOLING */
} NBN_MemoryManager;
extern NBN_MemoryManager nbn_mem_manager;
#pragma endregion /* Memory management */
#pragma region Serialization
typedef uint32_t Word;
#define WORD_BYTES (sizeof(Word))
#define WORD_BITS (WORD_BYTES * 8)
#define BITS_REQUIRED(min, max) (min == max) ? 0 : GetRequiredNumberOfBitsFor(max - min)
#define B_MASK(n) (1u << (n))
#define B_SET(mask, n) (mask |= B_MASK(n))
#define B_UNSET(mask, n) (mask &= ~B_MASK(n))
#define B_IS_SET(mask, n) ((B_MASK(n) & mask) == B_MASK(n))
#define B_IS_UNSET(mask, n) ((B_MASK(n) & mask) == 0)
#define ASSERT_VALUE_IN_RANGE(v, min, max) assert(v >= min && v <= max)
#define ASSERTED_SERIALIZE(stream, v, min, max, func) \
{ \
if (stream->type == NBN_STREAM_WRITE) \
ASSERT_VALUE_IN_RANGE(v, min, max); \
if ((func) < 0) \
NBN_Abort(); \
if (stream->type == NBN_STREAM_READ) \
ASSERT_VALUE_IN_RANGE(v, min, max); \
}
#define NBN_SerializeUInt(stream, v, min, max) \
ASSERTED_SERIALIZE(stream, v, min, max, stream->serialize_uint_func(stream, (unsigned int *)&(v), min, max))
#define NBN_SerializeUInt64(stream, v) stream->serialize_uint64_func(stream, (uint64_t *)&(v))
#define NBN_SerializeInt(stream, v, min, max) \
ASSERTED_SERIALIZE(stream, v, min, max, stream->serialize_int_func(stream, &(v), min, max))
#define NBN_SerializeFloat(stream, v, min, max, precision) \
ASSERTED_SERIALIZE(stream, v, min, max, stream->serialize_float_func(stream, &(v), min, max, precision))
#define NBN_SerializeBool(stream, v) ASSERTED_SERIALIZE(stream, v, 0, 1, stream->serialize_bool_func(stream, &(v)))
#define NBN_SerializeString(stream, v, length) NBN_SerializeBytes(stream, v, length)
#define NBN_SerializeBytes(stream, v, length) stream->serialize_bytes_func(stream, (uint8_t *)v, length)
#define NBN_SerializePadding(stream) stream->serialize_padding_func(stream)
#pragma region NBN_BitReader
typedef struct NBN_BitReader
{
unsigned int size;
uint8_t *buffer;
uint64_t scratch;
unsigned int scratch_bits_count;
unsigned int byte_cursor;
} NBN_BitReader;
void NBN_BitReader_Init(NBN_BitReader *, uint8_t *, unsigned int);
int NBN_BitReader_Read(NBN_BitReader *, Word *, unsigned int);
#pragma endregion /* NBN_BitReader */
#pragma region NBN_BitWriter
typedef struct NBN_BitWriter
{
unsigned int size;
uint8_t *buffer;
uint64_t scratch;
unsigned int scratch_bits_count;
unsigned int byte_cursor;
} NBN_BitWriter;
void NBN_BitWriter_Init(NBN_BitWriter*, uint8_t *, unsigned int);
int NBN_BitWriter_Write(NBN_BitWriter *, Word, unsigned int);
int NBN_BitWriter_Flush(NBN_BitWriter *);
#pragma endregion /* NBN_BitWriter */
#pragma region NBN_Stream
typedef struct NBN_Stream NBN_Stream;
typedef int (*NBN_Stream_SerializeUInt)(NBN_Stream *, unsigned int *, unsigned int, unsigned int);
typedef int (*NBN_Stream_SerializeUInt64)(NBN_Stream *, uint64_t *);
typedef int (*NBN_Stream_SerializeInt)(NBN_Stream *, int *, int, int);
typedef int (*NBN_Stream_SerializeFloat)(NBN_Stream *, float *, float, float, int);
typedef int (*NBN_Stream_SerializeBool)(NBN_Stream *, bool *);
typedef int (*NBN_Stream_SerializePadding)(NBN_Stream *);
typedef int (*NBN_Stream_SerializeBytes)(NBN_Stream *, uint8_t *, unsigned int);
typedef enum NBN_StreamType
{
NBN_STREAM_WRITE,
NBN_STREAM_READ,
NBN_STREAM_MEASURE
} NBN_StreamType;
struct NBN_Stream
{
NBN_StreamType type;
NBN_Stream_SerializeUInt serialize_uint_func;
NBN_Stream_SerializeUInt64 serialize_uint64_func;
NBN_Stream_SerializeInt serialize_int_func;
NBN_Stream_SerializeFloat serialize_float_func;
NBN_Stream_SerializeBool serialize_bool_func;
NBN_Stream_SerializePadding serialize_padding_func;
NBN_Stream_SerializeBytes serialize_bytes_func;
};
#pragma endregion /* NBN_Stream */
#pragma region NBN_ReadStream
typedef struct NBN_ReadStream
{
NBN_Stream base;
NBN_BitReader bit_reader;
} NBN_ReadStream;
void NBN_ReadStream_Init(NBN_ReadStream *, uint8_t *, unsigned int);
int NBN_ReadStream_SerializeUint(NBN_ReadStream *, unsigned int *, unsigned int, unsigned int);
int NBN_ReadStream_SerializeUint64(NBN_ReadStream *read_stream, uint64_t *value);
int NBN_ReadStream_SerializeInt(NBN_ReadStream *, int *, int, int);
int NBN_ReadStream_SerializeFloat(NBN_ReadStream *, float *, float, float, int);
int NBN_ReadStream_SerializeBool(NBN_ReadStream *, bool *);
int NBN_ReadStream_SerializePadding(NBN_ReadStream *);
int NBN_ReadStream_SerializeBytes(NBN_ReadStream *, uint8_t *, unsigned int);
#pragma endregion /* NBN_ReadStream */
#pragma region NBN_WriteStream
typedef struct NBN_WriteStream
{
NBN_Stream base;
NBN_BitWriter bit_writer;
} NBN_WriteStream;
void NBN_WriteStream_Init(NBN_WriteStream *, uint8_t *, unsigned int);
int NBN_WriteStream_SerializeUint(NBN_WriteStream *, unsigned int *, unsigned int, unsigned int);
int NBN_WriteStream_SerializeUint64(NBN_WriteStream *write_stream, uint64_t *value);
int NBN_WriteStream_SerializeInt(NBN_WriteStream *, int *, int, int);
int NBN_WriteStream_SerializeFloat(NBN_WriteStream *, float *, float, float, int);
int NBN_WriteStream_SerializeBool(NBN_WriteStream *, bool *);
int NBN_WriteStream_SerializePadding(NBN_WriteStream *);
int NBN_WriteStream_SerializeBytes(NBN_WriteStream *, uint8_t *, unsigned int);
int NBN_WriteStream_Flush(NBN_WriteStream *);
#pragma endregion /* NBN_WriteStream */
#pragma region NBN_MeasureStream
typedef struct NBN_MeasureStream
{
NBN_Stream base;
unsigned int number_of_bits;
} NBN_MeasureStream;
void NBN_MeasureStream_Init(NBN_MeasureStream *);
int NBN_MeasureStream_SerializeUint(NBN_MeasureStream *, unsigned int *, unsigned int, unsigned int);
int NBN_MeasureStream_SerializeUint64(NBN_MeasureStream *measure_stream, unsigned int *value);
int NBN_MeasureStream_SerializeInt(NBN_MeasureStream *, int *, int, int);
int NBN_MeasureStream_SerializeFloat(NBN_MeasureStream *, float *, float, float, int);
int NBN_MeasureStream_SerializeBool(NBN_MeasureStream *, bool *);
int NBN_MeasureStream_SerializePadding(NBN_MeasureStream *);
int NBN_MeasureStream_SerializeBytes(NBN_MeasureStream *, uint8_t *, unsigned int);
void NBN_MeasureStream_Reset(NBN_MeasureStream *);
#pragma endregion /* NBN_MeasureStream */
#pragma endregion /* Serialization */
#pragma region NBN_Message
#define NBN_MAX_CHANNELS 8
#define NBN_MAX_MESSAGE_TYPES 255 /* Maximum value of uint8_t, see message header */
#define NBN_MESSAGE_RESEND_DELAY 0.1 /* Number of seconds before a message is resent (reliable messages redundancy) */
typedef int (*NBN_MessageSerializer)(void *, NBN_Stream *);
typedef void *(*NBN_MessageBuilder)(void);
typedef void (*NBN_MessageDestructor)(void *);
typedef struct NBN_MessageHeader
{
uint16_t id;
uint8_t type;
uint8_t channel_id;
} NBN_MessageHeader;
/*
* Holds the user message's data as well as a reference count for message recycling
*/
typedef struct NBN_OutgoingMessage
{
uint8_t type;
unsigned int ref_count;
void *data;
} NBN_OutgoingMessage;
typedef struct NBN_Message
{
NBN_MessageHeader header;
NBN_Connection *sender;
NBN_OutgoingMessage *outgoing_msg; /* NULL for incoming messages */
void *data;
} NBN_Message;
/**
* Information about a received message.
*/
typedef struct NBN_MessageInfo
{
/** User defined message's type */
uint8_t type;
/** Channel the message was received on */
uint8_t channel_id;
/** Message's data */
void *data;
/**
* Message's sender.
*
* On the client side, it will always be NULL (all received messages come from the game server).
*/
NBN_Connection *sender;
} NBN_MessageInfo;
int NBN_Message_SerializeHeader(NBN_MessageHeader *, NBN_Stream *);
int NBN_Message_Measure(NBN_Message *, NBN_MeasureStream *, NBN_MessageSerializer);
int NBN_Message_SerializeData(NBN_Message *, NBN_Stream *, NBN_MessageSerializer);
#pragma endregion /* NBN_Message */
#pragma region Encryption
/*
* All "low-level" cryptography definitions used for nbnet packet encryption and authentication.
*
* I did not write any of the code in this section, I only regrouped it in there to keep nbnet contained
* into a single header. I used a total of three different open source libraries:
*
* ECDH: https://github.com/kokke/tiny-ECDH-c
* AES: https://github.com/kokke/tiny-AES-c
* Poly1305: https://github.com/floodyberry/poly1305-donna
*/
#pragma region ECDH
#define NIST_B163 1
#define NIST_K163 2
#define NIST_B233 3
#define NIST_K233 4
#define NIST_B283 5
#define NIST_K283 6
#define NIST_B409 7
#define NIST_K409 8
#define NIST_B571 9
#define NIST_K571 10
#define ECC_CURVE NIST_B233
#if defined(ECC_CURVE) && (ECC_CURVE != 0)
#if (ECC_CURVE == NIST_K163) || (ECC_CURVE == NIST_B163)
#define CURVE_DEGREE 163
#define ECC_PRV_KEY_SIZE 24
#elif (ECC_CURVE == NIST_K233) || (ECC_CURVE == NIST_B233)
#define CURVE_DEGREE 233
#define ECC_PRV_KEY_SIZE 32
#elif (ECC_CURVE == NIST_K283) || (ECC_CURVE == NIST_B283)
#define CURVE_DEGREE 283
#define ECC_PRV_KEY_SIZE 36
#elif (ECC_CURVE == NIST_K409) || (ECC_CURVE == NIST_B409)
#define CURVE_DEGREE 409
#define ECC_PRV_KEY_SIZE 52
#elif (ECC_CURVE == NIST_K571) || (ECC_CURVE == NIST_B571)
#define CURVE_DEGREE 571
#define ECC_PRV_KEY_SIZE 72
#endif
#else
#error Must define a curve to use
#endif
#define ECC_PUB_KEY_SIZE (2 * ECC_PRV_KEY_SIZE)
#pragma endregion /* ECDH */
#pragma region AES
#define AES128 1
//#define AES192 1
//#define AES256 1
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
#if defined(AES256) && (AES256 == 1)
#define AES_KEYLEN 32
#define AES_keyExpSize 240
#elif defined(AES192) && (AES192 == 1)
#define AES_KEYLEN 24
#define AES_keyExpSize 208
#else
#define AES_KEYLEN 16 // Key length in bytes
#define AES_keyExpSize 176
#endif
struct AES_ctx
{
uint8_t RoundKey[AES_keyExpSize];
uint8_t Iv[AES_BLOCKLEN];
};
#pragma endregion /* AES */
#pragma region Poly1305
#define POLY1305_KEYLEN 32
#define POLY1305_TAGLEN 16
#pragma endregion /* Poly1305 */
#pragma region Pseudo random generator
typedef void* CSPRNG;
#ifdef _WIN32
#include <windows.h>
#include <wincrypt.h>
#ifdef _MSC_VER
#pragma comment(lib, "advapi32.lib")
#endif
typedef union CSPRNG_TYPE
{
CSPRNG object;
HCRYPTPROV hCryptProv;
}
CSPRNG_TYPE;
#else
#include <stdio.h>
typedef union CSPRNG_TYPE
{
CSPRNG object;
FILE* urandom;
}
CSPRNG_TYPE;
#endif /* _WIN32 */
#pragma endregion /* Pseudo random generator */
#pragma endregion /* Encryption */
#pragma region RPC
#define NBN_RPC_MAX_PARAM_COUNT 16 /* Maximum number of parameters a RPC signature can accept */
#define NBN_RPC_MAX 32 /* Maximum number of registered RPCs */
#define NBN_RPC_STRING_MAX_LENGTH 256 /* Maximum length of a RPC string parameter */
/* Helper macros */
#define NBN_RPC_BuildSignature(pc, ...) ((NBN_RPC_Signature){.param_count = pc, .params = {__VA_ARGS__}})
#define NBN_RPC_Int(v) ((NBN_RPC_Param){.type = NBN_RPC_PARAM_INT, .value = {.i = v}})
#define NBN_RPC_Float(v) ((NBN_RPC_Param){.type = NBN_RPC_PARAM_FLOAT, .value = {.f = v}})
#define NBN_RPC_GetInt(params, idx) (params[idx].value.i)
#define NBN_RPC_GetFloat(params, idx) (params[idx].value.f)
#define NBN_RPC_GetBool(params, idx) (params[idx].value.b)
#define NBN_RPC_GetString(params, idx) (params[idx].value.s)
typedef enum NBN_RPC_ParamType
{
NBN_RPC_PARAM_INT,
NBN_RPC_PARAM_FLOAT,
NBN_RPC_PARAM_BOOL,
NBN_RPC_PARAM_STRING
} NBN_RPC_ParamType;
typedef struct NBN_RPC_String
{
char string[NBN_RPC_STRING_MAX_LENGTH];
unsigned int length;
} NBN_RPC_String;
typedef union NBN_RPC_ParamValue
{
int i;
float f;
bool b;
char s[NBN_RPC_STRING_MAX_LENGTH];
} NBN_RPC_ParamValue;
typedef struct NBN_RPC_Param
{
NBN_RPC_ParamType type;
NBN_RPC_ParamValue value;
} NBN_RPC_Param;
typedef struct NBN_RPC_Signature
{
unsigned int param_count;
NBN_RPC_ParamType params[NBN_RPC_MAX_PARAM_COUNT];
} NBN_RPC_Signature;
typedef void (*NBN_RPC_Func)(unsigned int, NBN_RPC_Param[NBN_RPC_MAX_PARAM_COUNT], NBN_Connection *sender);
typedef struct NBN_RPC
{
unsigned int id;
NBN_RPC_Signature signature;
NBN_RPC_Func func;
} NBN_RPC;
#pragma endregion /* RPC */
#pragma region NBN_Packet
/*
* Maximum allowed packet size (including header) in bytes.
* The 1400 value has been chosen based on this statement:
*
* With the IPv4 header being 20 bytes and the UDP header being 8 bytes, the payload
* of a UDP packet should be no larger than 1500 - 20 - 8 = 1472 bytes to avoid fragmentation.
*/
#define NBN_PACKET_MAX_SIZE 1400
#define NBN_MAX_MESSAGES_PER_PACKET 255 /* Maximum value of uint8_t, see packet header */
#define NBN_PACKET_HEADER_SIZE sizeof(NBN_PacketHeader)
/* Maximum size of packet's data (NBN_PACKET_MAX_DATA_SIZE + NBN_PACKET_HEADER_SIZE = NBN_PACKET_MAX_SIZE) */
#define NBN_PACKET_MAX_DATA_SIZE (NBN_PACKET_MAX_SIZE - NBN_PACKET_HEADER_SIZE)
/*
* Maximum size of user's data. This is the NBN_PACKET_MAX_DATA_SIZE minus the size of an AES block so we don't
* exceed the maximum packet size after AES encryption
*/
#define NBN_PACKET_MAX_USER_DATA_SIZE (NBN_PACKET_MAX_DATA_SIZE - AES_BLOCKLEN)
enum
{
NBN_PACKET_WRITE_ERROR = -1,
NBN_PACKET_WRITE_OK,
NBN_PACKET_WRITE_NO_SPACE,
};
typedef enum NBN_PacketMode
{
NBN_PACKET_MODE_WRITE = 1,
NBN_PACKET_MODE_READ
} NBN_PacketMode;
typedef struct NBN_PacketHeader
{
uint32_t protocol_id;
uint16_t seq_number;
uint16_t ack;
uint32_t ack_bits;
uint8_t messages_count;
/*
* Encryption part
*
* 17 bytes overhead (not used when encryption is disabled)
*/
uint8_t is_encrypted;
uint8_t auth_tag[POLY1305_TAGLEN]; /* Poly1305 auth tag */
} NBN_PacketHeader;
typedef struct NBN_Packet
{
NBN_PacketHeader header;
NBN_PacketMode mode;
struct NBN_Connection *sender; /* not serialized, fill by the network driver upon reception */
uint8_t buffer[NBN_PACKET_MAX_SIZE];
unsigned int size; /* in bytes */
bool sealed;
// streams
NBN_WriteStream w_stream;
NBN_ReadStream r_stream;
NBN_MeasureStream m_stream;
/* AES IV, different for each packet (computed from packet's sequence number) */
uint8_t aes_iv[AES_BLOCKLEN];
} NBN_Packet;
void NBN_Packet_InitWrite(NBN_Packet *, uint32_t, uint16_t, uint16_t, uint32_t);
int NBN_Packet_InitRead(NBN_Packet *, NBN_Connection *, uint8_t[NBN_PACKET_MAX_SIZE], unsigned int);
uint32_t NBN_Packet_ReadProtocolId(uint8_t[NBN_PACKET_MAX_SIZE], unsigned int);
int NBN_Packet_WriteMessage(NBN_Packet *, NBN_Message *, NBN_MessageSerializer);
int NBN_Packet_Seal(NBN_Packet *, NBN_Connection *);
/* Encryption related functions */
void NBN_Packet_Encrypt(NBN_Packet *, NBN_Connection *);
void NBN_Packet_Decrypt(NBN_Packet *, NBN_Connection *);
void NBN_Packet_ComputeIV(NBN_Packet *, NBN_Connection *);
void NBN_Packet_Authenticate(NBN_Packet *, NBN_Connection *);
bool NBN_Packet_CheckAuthentication(NBN_Packet *, NBN_Connection *);
void NBN_Packet_ComputePoly1305Key(NBN_Packet *, NBN_Connection *, uint8_t *);
#pragma endregion /* NBN_Packet */
#pragma region NBN_MessageChunk
/* Chunk max size is the number of bytes of data a packet can hold minus the size of a message header minus 2 bytes
* to hold the chunk id and total number of chunks.
*/
#define NBN_MESSAGE_CHUNK_SIZE (NBN_PACKET_MAX_USER_DATA_SIZE - sizeof(NBN_MessageHeader) - 2)
#define NBN_MESSAGE_CHUNK_TYPE (NBN_MAX_MESSAGE_TYPES - 1) /* Reserved message type for chunks */
typedef struct NBN_MessageChunk
{
uint8_t id;
uint8_t total;
uint8_t data[NBN_MESSAGE_CHUNK_SIZE];
NBN_OutgoingMessage *outgoing_msg;
} NBN_MessageChunk;
NBN_MessageChunk *NBN_MessageChunk_Create(void);
void NBN_MessageChunk_Destroy(NBN_MessageChunk *);
int NBN_MessageChunk_Serialize(NBN_MessageChunk *, NBN_Stream *);
#pragma endregion /* NBN_MessageChunk */
#pragma region NBN_ClientClosedMessage
#define NBN_CLIENT_CLOSED_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 2) /* Reserved message type */
typedef struct NBN_ClientClosedMessage
{
int code;
} NBN_ClientClosedMessage;
NBN_ClientClosedMessage *NBN_ClientClosedMessage_Create(void);
void NBN_ClientClosedMessage_Destroy(NBN_ClientClosedMessage *);
int NBN_ClientClosedMessage_Serialize(NBN_ClientClosedMessage *, NBN_Stream *);
#pragma endregion /* NBN_ClientClosedMessage */
#pragma region NBN_ClientAcceptedMessage
#define NBN_CLIENT_ACCEPTED_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 3) /* Reserved message type */
#define NBN_ACCEPT_DATA_MAX_SIZE 4096
#define NBN_CONNECTION_DATA_MAX_SIZE 512
typedef struct NBN_ClientAcceptedMessage
{
uint8_t data[NBN_ACCEPT_DATA_MAX_SIZE];
} NBN_ClientAcceptedMessage;
NBN_ClientAcceptedMessage *NBN_ClientAcceptedMessage_Create(void);
void NBN_ClientAcceptedMessage_Destroy(NBN_ClientAcceptedMessage *);
int NBN_ClientAcceptedMessage_Serialize(NBN_ClientAcceptedMessage *, NBN_Stream *);
#pragma endregion /* NBN_ClientAcceptedMessage */
#pragma region NBN_ByteArrayMessage
#define NBN_BYTE_ARRAY_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 4) /* Reserved message type */
#define NBN_BYTE_ARRAY_MAX_SIZE 4096
typedef struct NBN_ByteArrayMessage
{
uint8_t bytes[NBN_BYTE_ARRAY_MAX_SIZE];
unsigned int length;
} NBN_ByteArrayMessage;
NBN_ByteArrayMessage *NBN_ByteArrayMessage_Create(void);
void NBN_ByteArrayMessage_Destroy(NBN_ByteArrayMessage *);
int NBN_ByteArrayMessage_Serialize(NBN_ByteArrayMessage *, NBN_Stream *);
#pragma endregion /* NBN_ByteArrayMessage */
#pragma region NBN_PublicCryptoInfoMessage
#define NBN_PUBLIC_CRYPTO_INFO_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 5) /* Reserved message type */
typedef struct NBN_PublicCryptoInfoMessage
{
uint8_t pub_key1[ECC_PUB_KEY_SIZE];
uint8_t pub_key2[ECC_PUB_KEY_SIZE];
uint8_t pub_key3[ECC_PUB_KEY_SIZE];
uint8_t aes_iv[AES_BLOCKLEN];
} NBN_PublicCryptoInfoMessage;
NBN_PublicCryptoInfoMessage *NBN_PublicCryptoInfoMessage_Create(void);
void NBN_PublicCryptoInfoMessage_Destroy(NBN_PublicCryptoInfoMessage *);
int NBN_PublicCryptoInfoMessage_Serialize(NBN_PublicCryptoInfoMessage *, NBN_Stream *);
#pragma endregion /* NBN_PublicCryptoInfoMessage */
#pragma region NBN_StartEncryptMessage
#define NBN_START_ENCRYPT_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 6) /* Reserved message type */
void *NBN_StartEncryptMessage_Create(void);
void NBN_StartEncryptMessage_Destroy(void *);
int NBN_StartEncryptMessage_Serialize(void *, NBN_Stream *);
#pragma endregion /* NBN_StartEncryptMessage */
#pragma region NBN_DisconnectionMessage
#define NBN_DISCONNECTION_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 7) /* Reserved message type */
void *NBN_DisconnectionMessage_Create(void);
void NBN_DisconnectionMessage_Destroy(void *);
int NBN_DisconnectionMessage_Serialize(void *, NBN_Stream *);
#pragma endregion /* NBN_DisconnectionMessage */
#pragma region NBN_ConnectionRequestMessage
#define NBN_CONNECTION_REQUEST_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 8) /* Reserved message type */
typedef struct NBN_ConnectionRequestMessage
{
uint8_t data[NBN_CONNECTION_DATA_MAX_SIZE];
} NBN_ConnectionRequestMessage;
NBN_ConnectionRequestMessage *NBN_ConnectionRequestMessage_Create(void);
void NBN_ConnectionRequestMessage_Destroy(NBN_ConnectionRequestMessage *);
int NBN_ConnectionRequestMessage_Serialize(NBN_ConnectionRequestMessage *, NBN_Stream *);
#pragma endregion /* NBN_ConnectionRequestMessage */
#pragma region NBN_RPC_Message
#define NBN_RPC_MESSAGE_TYPE (NBN_MAX_MESSAGE_TYPES - 9) /* Reserved message type */
typedef struct NBN_RPC_Message
{
unsigned int id;
unsigned int param_count;
NBN_RPC_Param params[NBN_RPC_MAX_PARAM_COUNT];
} NBN_RPC_Message;
void *NBN_RPC_Message_Create(void);
void NBN_RPC_Message_Destroy(NBN_RPC_Message *);
int NBN_RPC_Message_Serialize(NBN_RPC_Message *, NBN_Stream *);
#pragma endregion /* NBN_RPC_Message */
#pragma region NBN_Channel
#define NBN_CHANNEL_BUFFER_SIZE 1024
#define NBN_CHANNEL_CHUNKS_BUFFER_SIZE 255
#define NBN_CHANNEL_RW_CHUNK_BUFFER_INITIAL_SIZE 2048
#define NBN_CHANNEL_OUTGOING_MESSAGE_POOL_SIZE 512
/* Library reserved unreliable ordered channel */
#define NBN_CHANNEL_RESERVED_UNRELIABLE (NBN_MAX_CHANNELS - 1)
/* Library reserved reliable ordered channel */
#define NBN_CHANNEL_RESERVED_RELIABLE (NBN_MAX_CHANNELS - 2)
/* Library reserved messages channel */
#define NBN_CHANNEL_RESERVED_LIBRARY_MESSAGES (NBN_MAX_CHANNELS - 3)
typedef NBN_Channel *(*NBN_ChannelBuilder)(void);
typedef void (*NBN_ChannelDestructor)(NBN_Channel *);
typedef struct NBN_MessageSlot
{
NBN_Message message;
double last_send_time;
bool free;
} NBN_MessageSlot;
struct NBN_Channel
{
uint8_t id;
uint8_t *write_chunk_buffer;
uint16_t next_outgoing_message_id;
uint16_t next_recv_message_id;
unsigned int next_outgoing_message_pool_slot;
unsigned int outgoing_message_count;
unsigned int chunk_count;
unsigned int write_chunk_buffer_size;
unsigned int read_chunk_buffer_size;
unsigned int next_outgoing_chunked_message;
int last_received_chunk_id;
double time;
uint8_t *read_chunk_buffer;
NBN_ChannelDestructor destructor;
NBN_Connection *connection;
NBN_MessageSlot outgoing_message_slot_buffer[NBN_CHANNEL_BUFFER_SIZE];
NBN_MessageSlot recved_message_slot_buffer[NBN_CHANNEL_BUFFER_SIZE];
NBN_MessageChunk *recv_chunk_buffer[NBN_CHANNEL_CHUNKS_BUFFER_SIZE];
NBN_OutgoingMessage outgoing_message_pool[NBN_CHANNEL_OUTGOING_MESSAGE_POOL_SIZE];
bool (*AddReceivedMessage)(NBN_Channel *, NBN_Message *);
bool (*AddOutgoingMessage)(NBN_Channel *, NBN_Message *);
NBN_Message *(*GetNextRecvedMessage)(NBN_Channel *);
NBN_Message *(*GetNextOutgoingMessage)(NBN_Channel *);
int (*OnOutgoingMessageAcked)(NBN_Channel *, uint16_t);
int (*OnOutgoingMessageSent)(NBN_Channel *, NBN_Connection *, NBN_Message *);
};
void NBN_Channel_Destroy(NBN_Channel *);
void NBN_Channel_AddTime(NBN_Channel *, double);
bool NBN_Channel_AddChunk(NBN_Channel *, NBN_Message *);
int NBN_Channel_ReconstructMessageFromChunks(NBN_Channel *, NBN_Connection *, NBN_Message *);
void NBN_Channel_ResizeWriteChunkBuffer(NBN_Channel *, unsigned int);
void NBN_Channel_ResizeReadChunkBuffer(NBN_Channel *, unsigned int);
void NBN_Channel_UpdateMessageLastSendTime(NBN_Channel *, NBN_Message *, double);
/*
Unreliable ordered
Guarantee that messages will be received in order, does not however guarantee that all message will be received when
packets get lost. This is meant to be used for time critical messages when it does not matter that much if they
end up getting lost. A good example would be game snaphosts when any newly received snapshot is more up to date
than the previous one.
*/
typedef struct NBN_UnreliableOrderedChannel
{
NBN_Channel base;
uint16_t last_received_message_id;
unsigned int next_outgoing_message_slot;
} NBN_UnreliableOrderedChannel;
NBN_UnreliableOrderedChannel *NBN_UnreliableOrderedChannel_Create(void);
/*
Reliable ordered
Will guarantee that all messages will be received in order. Use this when you want to make sure a message
will be received, for example for chat messages or initial game world state.
*/
typedef struct NBN_ReliableOrderedChannel
{
NBN_Channel base;
uint16_t oldest_unacked_message_id;
uint16_t most_recent_message_id;
bool ack_buffer[NBN_CHANNEL_BUFFER_SIZE];
} NBN_ReliableOrderedChannel;
NBN_ReliableOrderedChannel *NBN_ReliableOrderedChannel_Create(void);
#pragma endregion /* NBN_Channel */
#pragma region NBN_Config
typedef struct NBN_Config
{
const char *protocol_name;
const char *ip_address;
uint16_t port;
bool is_encryption_enabled;
} NBN_Config;
#pragma endregion
#pragma region NBN_Connection
#define NBN_MAX_PACKET_ENTRIES 1024
/* Maximum number of packets that can be sent in a single flush
*
* IMPORTANT: do not increase this, it will break packet acks
*/
#define NBN_CONNECTION_MAX_SENT_PACKET_COUNT 16
/* Number of seconds before the connection is considered stale and get closed */
#define NBN_CONNECTION_STALE_TIME_THRESHOLD 3
typedef struct NBN_MessageEntry
{
uint16_t id;
uint8_t channel_id;
} NBN_MessageEntry;
typedef struct NBN_PacketEntry
{
bool acked;
bool flagged_as_lost;
unsigned int messages_count;
double send_time;
NBN_MessageEntry messages[NBN_MAX_MESSAGES_PER_PACKET];
} NBN_PacketEntry;
typedef struct NBN_ConnectionStats
{
double ping;
unsigned int total_lost_packets;
float packet_loss;
float upload_bandwidth;
float download_bandwidth;
} NBN_ConnectionStats;
#ifdef NBN_DEBUG
typedef enum NBN_ConnectionDebugCallback
{
NBN_DEBUG_CB_MSG_ADDED_TO_RECV_QUEUE
} NBN_ConnectionDebugCallback;
#endif /* NBN_DEBUG */
typedef struct NBN_ConnectionKeySet
{
uint8_t pub_key[ECC_PUB_KEY_SIZE]; /* Public key */
uint8_t prv_key[ECC_PRV_KEY_SIZE]; /* Private key */
uint8_t shared_key[ECC_PUB_KEY_SIZE]; /* Shared key */
} NBN_ConnectionKeySet;
struct NBN_Connection
{
uint32_t id;
uint32_t protocol_id;
double last_recv_packet_time; /* Used to detect stale connections */
double last_flush_time; /* Last time the send queue was flushed */
double last_read_packets_time; /* Last time packets were read from the network driver */
double time; /* Current time */
unsigned int downloaded_bytes; /* Keep track of bytes read from the socket (used for download bandwith calculation) */
uint8_t is_accepted : 1;
uint8_t is_stale : 1;
uint8_t is_closed : 1;
struct NBN_Endpoint *endpoint;
NBN_Driver *driver; /* Network driver used for that connection */
NBN_Channel *channels[NBN_MAX_CHANNELS]; /* Messages channeling (sending & receiving) */
NBN_ConnectionStats stats;
void *driver_data; /* Data attached to the connection by the underlying driver */
void *user_data; /* Used to attach data from the user code */
uint8_t connection_data[NBN_CONNECTION_DATA_MAX_SIZE]; /* Connection data, sent by the client upon connection */
uint8_t accept_data[NBN_ACCEPT_DATA_MAX_SIZE]; /* Accept data */
NBN_WriteStream accept_data_w_stream; /* Used by the game server to write accept data */
NBN_ReadStream accept_data_r_stream; /* Used by the client to read accept data */
#ifdef NBN_DEBUG
/* Debug callbacks */
void (*OnMessageAddedToRecvQueue)(struct NBN_Connection *, NBN_Message *);
#endif /* NBN_DEBUG */
/*
* Packet sequencing & acking
*/
uint16_t next_packet_seq_number;
uint16_t last_received_packet_seq_number;
uint32_t packet_send_seq_buffer[NBN_MAX_PACKET_ENTRIES];
NBN_PacketEntry packet_send_buffer[NBN_MAX_PACKET_ENTRIES];
uint32_t packet_recv_seq_buffer[NBN_MAX_PACKET_ENTRIES];
/*
* Encryption related fields
*/
NBN_ConnectionKeySet keys1; /* Used for message encryption */
NBN_ConnectionKeySet keys2; /* Used for packets IV */
NBN_ConnectionKeySet keys3; /* Used for poly1305 keys generation */
uint8_t aes_iv[AES_BLOCKLEN]; /* AES IV */
uint8_t can_decrypt : 1;
uint8_t can_encrypt : 1;
};
NBN_Connection *NBN_Connection_Create(uint32_t, uint32_t, NBN_Endpoint *, NBN_Driver *, void *driver_data);
void NBN_Connection_Destroy(NBN_Connection *);
int NBN_Connection_ProcessReceivedPacket(NBN_Connection *, NBN_Packet *);
int NBN_Connection_EnqueueOutgoingMessage(NBN_Connection *, NBN_Channel *, NBN_Message *);
int NBN_Connection_FlushSendQueue(NBN_Connection *);
int NBN_Connection_InitChannel(NBN_Connection *, NBN_Channel *);
bool NBN_Connection_CheckIfStale(NBN_Connection *);
void NBN_Connection_AddTime(NBN_Connection *, double);
#pragma endregion /* NBN_Connection */
#pragma region NBN_EventQueue
#define NBN_NO_EVENT 0 /* No event left in the events queue */
#define NBN_SKIP_EVENT 1 /* Indicates that the event should be skipped */
#define NBN_EVENT_QUEUE_CAPACITY 1024
typedef struct NBN_EventData
{
NBN_MessageInfo message_info;
NBN_Connection *connection;
} NBN_EventData;
typedef struct NBN_Event
{
int type;
NBN_EventData data;
} NBN_Event;
typedef struct NBN_EventQueue
{
NBN_Event events[NBN_EVENT_QUEUE_CAPACITY];
unsigned int head;
unsigned int tail;