transmission/libtransmission/peer-io.h

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/*
* This file Copyright (C) 2007-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
/**
***
**/
#include <assert.h>
#include "transmission.h"
#include "bandwidth.h"
#include "crypto.h"
#include "net.h" /* tr_address */
#include "peer-socket.h"
#include "utils.h" /* tr_time() */
struct evbuffer;
struct tr_bandwidth;
struct tr_datatype;
struct tr_peerIo;
/**
* @addtogroup networked_io Networked IO
* @{
*/
enum ReadState
{
READ_NOW,
READ_LATER,
READ_ERR
};
enum tr_encryption_type
{
/* these match the values in MSE's crypto_select */
PEER_ENCRYPTION_NONE = (1 << 0),
PEER_ENCRYPTION_RC4 = (1 << 1)
};
using tr_can_read_cb = ReadState (*)(struct tr_peerIo* io, void* user_data, size_t* setme_piece_byte_count);
using tr_did_write_cb = void (*)(struct tr_peerIo* io, size_t bytesWritten, bool wasPieceData, void* userData);
using tr_net_error_cb = void (*)(struct tr_peerIo* io, short what, void* userData);
struct tr_peerIo
{
bool isEncrypted;
bool isIncoming;
bool peerIdIsSet;
bool extendedProtocolSupported;
bool fastExtensionSupported;
bool dhtSupported;
bool utpSupported;
tr_priority_t priority;
short int pendingEvents;
int magicNumber;
tr_encryption_type encryption_type;
bool isSeed;
tr_port port;
struct tr_peer_socket socket;
int refCount;
uint8_t peerId[SHA_DIGEST_LENGTH];
time_t timeCreated;
tr_session* session;
tr_address addr;
tr_can_read_cb canRead;
tr_did_write_cb didWrite;
tr_net_error_cb gotError;
void* userData;
struct tr_bandwidth bandwidth;
tr_crypto crypto;
struct evbuffer* inbuf;
struct evbuffer* outbuf;
struct tr_datatype* outbuf_datatypes;
struct event* event_read;
struct event* event_write;
};
/**
***
**/
tr_peerIo* tr_peerIoNewOutgoing(
tr_session* session,
struct tr_bandwidth* parent,
struct tr_address const* addr,
tr_port port,
uint8_t const* torrentHash,
bool isSeed,
bool utp);
tr_peerIo* tr_peerIoNewIncoming(
tr_session* session,
struct tr_bandwidth* parent,
struct tr_address const* addr,
tr_port port,
struct tr_peer_socket const socket);
void tr_peerIoRefImpl(char const* file, int line, tr_peerIo* io);
#define tr_peerIoRef(io) tr_peerIoRefImpl(__FILE__, __LINE__, (io))
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void tr_peerIoUnrefImpl(char const* file, int line, tr_peerIo* io);
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#define tr_peerIoUnref(io) tr_peerIoUnrefImpl(__FILE__, __LINE__, (io))
#define PEER_IO_MAGIC_NUMBER 206745
constexpr bool tr_isPeerIo(tr_peerIo const* io)
{
return io != nullptr && io->magicNumber == PEER_IO_MAGIC_NUMBER && io->refCount >= 0 && tr_isBandwidth(&io->bandwidth) &&
tr_address_is_valid(&io->addr);
}
/**
***
**/
constexpr void tr_peerIoEnableFEXT(tr_peerIo* io, bool flag)
{
io->fastExtensionSupported = flag;
}
constexpr bool tr_peerIoSupportsFEXT(tr_peerIo const* io)
{
return io->fastExtensionSupported;
}
constexpr void tr_peerIoEnableLTEP(tr_peerIo* io, bool flag)
{
io->extendedProtocolSupported = flag;
}
constexpr bool tr_peerIoSupportsLTEP(tr_peerIo const* io)
{
return io->extendedProtocolSupported;
}
constexpr void tr_peerIoEnableDHT(tr_peerIo* io, bool flag)
{
io->dhtSupported = flag;
}
constexpr bool tr_peerIoSupportsDHT(tr_peerIo const* io)
{
return io->dhtSupported;
}
constexpr bool tr_peerIoSupportsUTP(tr_peerIo const* io)
{
return io->utpSupported;
}
/**
***
**/
constexpr tr_session* tr_peerIoGetSession(tr_peerIo* io)
{
TR_ASSERT(tr_isPeerIo(io));
TR_ASSERT(io->session != nullptr);
return io->session;
}
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char const* tr_peerIoGetAddrStr(tr_peerIo const* io, char* buf, size_t buflen);
struct tr_address const* tr_peerIoGetAddress(tr_peerIo const* io, tr_port* port);
uint8_t const* tr_peerIoGetTorrentHash(tr_peerIo* io);
bool tr_peerIoHasTorrentHash(tr_peerIo const* io);
void tr_peerIoSetTorrentHash(tr_peerIo* io, uint8_t const* hash);
int tr_peerIoReconnect(tr_peerIo* io);
constexpr bool tr_peerIoIsIncoming(tr_peerIo const* io)
{
return io->isIncoming;
}
static inline int tr_peerIoGetAge(tr_peerIo const* io)
{
return tr_time() - io->timeCreated;
}
/**
***
**/
void tr_peerIoSetPeersId(tr_peerIo* io, uint8_t const* peer_id);
constexpr uint8_t const* tr_peerIoGetPeersId(tr_peerIo const* io)
{
TR_ASSERT(tr_isPeerIo(io));
TR_ASSERT(io->peerIdIsSet);
return io->peerId;
}
/**
***
**/
void tr_peerIoSetIOFuncs(tr_peerIo* io, tr_can_read_cb readcb, tr_did_write_cb writecb, tr_net_error_cb errcb, void* user_data);
void tr_peerIoClear(tr_peerIo* io);
/**
***
**/
void tr_peerIoWriteBytes(tr_peerIo* io, void const* writeme, size_t writemeLen, bool isPieceData);
void tr_peerIoWriteBuf(tr_peerIo* io, struct evbuffer* buf, bool isPieceData);
/**
***
**/
constexpr tr_crypto* tr_peerIoGetCrypto(tr_peerIo* io)
{
return &io->crypto;
}
void tr_peerIoSetEncryption(tr_peerIo* io, tr_encryption_type encryption_type);
constexpr bool tr_peerIoIsEncrypted(tr_peerIo const* io)
{
return io != nullptr && io->encryption_type == PEER_ENCRYPTION_RC4;
}
void evbuffer_add_uint8(struct evbuffer* outbuf, uint8_t byte);
void evbuffer_add_uint16(struct evbuffer* outbuf, uint16_t hs);
void evbuffer_add_uint32(struct evbuffer* outbuf, uint32_t hl);
void evbuffer_add_uint64(struct evbuffer* outbuf, uint64_t hll);
static inline void evbuffer_add_hton_16(struct evbuffer* buf, uint16_t val)
{
evbuffer_add_uint16(buf, val);
}
static inline void evbuffer_add_hton_32(struct evbuffer* buf, uint32_t val)
{
evbuffer_add_uint32(buf, val);
}
static inline void evbuffer_add_hton_64(struct evbuffer* buf, uint64_t val)
{
evbuffer_add_uint64(buf, val);
}
void tr_peerIoReadBytesToBuf(tr_peerIo* io, struct evbuffer* inbuf, struct evbuffer* outbuf, size_t byteCount);
void tr_peerIoReadBytes(tr_peerIo* io, struct evbuffer* inbuf, void* bytes, size_t byteCount);
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static inline void tr_peerIoReadUint8(tr_peerIo* io, struct evbuffer* inbuf, uint8_t* setme)
{
tr_peerIoReadBytes(io, inbuf, setme, sizeof(uint8_t));
}
void tr_peerIoReadUint16(tr_peerIo* io, struct evbuffer* inbuf, uint16_t* setme);
void tr_peerIoReadUint32(tr_peerIo* io, struct evbuffer* inbuf, uint32_t* setme);
void tr_peerIoDrain(tr_peerIo* io, struct evbuffer* inbuf, size_t byteCount);
/**
***
**/
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size_t tr_peerIoGetWriteBufferSpace(tr_peerIo const* io, uint64_t now);
static inline void tr_peerIoSetParent(tr_peerIo* io, struct tr_bandwidth* parent)
{
TR_ASSERT(tr_isPeerIo(io));
tr_bandwidthSetParent(&io->bandwidth, parent);
}
void tr_peerIoBandwidthUsed(tr_peerIo* io, tr_direction direction, size_t byteCount, int isPieceData);
static inline bool tr_peerIoHasBandwidthLeft(tr_peerIo const* io, tr_direction dir)
{
return tr_bandwidthClamp(&io->bandwidth, dir, 1024) > 0;
}
static inline unsigned int tr_peerIoGetPieceSpeed_Bps(tr_peerIo const* io, uint64_t now, tr_direction dir)
{
return tr_bandwidthGetPieceSpeed_Bps(&io->bandwidth, now, dir);
}
/**
***
**/
void tr_peerIoSetEnabled(tr_peerIo* io, tr_direction dir, bool isEnabled);
int tr_peerIoFlush(tr_peerIo* io, tr_direction dir, size_t byteLimit);
int tr_peerIoFlushOutgoingProtocolMsgs(tr_peerIo* io);
/**
***
**/
constexpr struct evbuffer* tr_peerIoGetReadBuffer(tr_peerIo* io)
{
return io->inbuf;
}
/* @} */