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