c-libp2p/include/libp2p/conn/session.h

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#pragma once
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#include <pthread.h>
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#include "libp2p/crypto/key.h"
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#include "libp2p/db/datastore.h"
#include "libp2p/db/filestore.h"
/***
* Holds the details of communication between two hosts
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*
* NOTE: This needs a deep cleaning. The links between c-ipfs and c-libp2p should
* be clearly defined. This seems to tie the two together inappropriately.
*/
enum IPTrafficType { TCP, UDP };
struct SessionContext {
// to get the connection started
char* host;
int port;
enum IPTrafficType traffic_type;
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pthread_mutex_t stream_mutex;
// once the connection is established
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/**
* Note: default_stream should be used in most cases. Often, insecure_stream and secure_stream will be
* the same. This should be re-thought, probably better named, and simplified. Perhaps 1 stream and
* indicators regarding which protocols have been negotiated (i.e. multistream over secio)?
*/
struct Stream* insecure_stream;
struct Stream* secure_stream;
struct Stream* default_stream;
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struct Datastore* datastore;
struct Filestore* filestore;
// filled in during negotiations
char* chosen_curve;
char* chosen_cipher;
char* chosen_hash;
unsigned char* shared_key; // a shared key based off of the ephemeral private key
size_t shared_key_size;
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//unsigned char* mac;
//size_t mac_size;
// the following items carry state for the sha256 stream cipher, and should probably not be touched.
size_t aes_encode_nonce_offset;
unsigned char aes_encode_stream_block[16];
size_t aes_decode_nonce_offset;
unsigned char aes_decode_stream_block[16];
/**
* The mac function to use
* @param 1 the incoming data bytes
* @param 2 the size of the incoming array
* @param 3 the results. Must be allocated to correct size (or larger)
* @returns true(1) on success, false(0) otherwise
*/
int (*mac_function)(const unsigned char*, size_t, unsigned char*);
// local only stuff
unsigned char local_nonce[16];
struct EphemeralPrivateKey* ephemeral_private_key;
struct StretchedKey* local_stretched_key;
// remote stuff
unsigned char remote_nonce[16];
struct PublicKey remote_key;
char* remote_peer_id;
struct StretchedKey* remote_stretched_key;
unsigned char* remote_ephemeral_public_key;
size_t remote_ephemeral_public_key_size;
};
/***
* Allocate resources for a new SessionContext struct
* @returns the newly allocated SessionContext, or NULL
*/
struct SessionContext* libp2p_session_context_new();
/**
* Free resources of a SessionContext struct
* @param context the SessionContext
* @returns true(1)
*/
int libp2p_session_context_free(struct SessionContext* session);
/***
* Compare 2 SessionContext structs for equality
* @param a side A
* @param b side B
* @returns 0 if equal, <0 if A wins, >0 if B wins
*/
int libp2p_session_context_compare(const struct SessionContext* a, const struct SessionContext* b);
struct SessionContext* libp2p_session_context_copy(const struct SessionContext* original);