mirror of
https://github.com/transmission/transmission
synced 2024-12-29 02:56:11 +00:00
c472cbd88d
* refactor: [[maybe_unused]] iff arg _might_ be used If the arg is never used, comment out its name. If the arg is _sometimes_ used e.g. with ifdefs, use [[maybe_unused]].
1408 lines
35 KiB
C++
1408 lines
35 KiB
C++
/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <algorithm>
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#include <cerrno>
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#include <cstdint>
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#include <cstring>
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#include <event2/event.h>
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#include <event2/buffer.h>
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#include <event2/bufferevent.h>
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#include <libutp/utp.h>
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#include "transmission.h"
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#include "session.h"
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#include "bandwidth.h"
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#include "log.h"
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#include "net.h"
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#include "peer-common.h" /* MAX_BLOCK_SIZE */
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#include "peer-io.h"
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#include "tr-assert.h"
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#include "tr-utp.h"
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#include "trevent.h" /* tr_runInEventThread() */
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#include "utils.h"
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#ifdef _WIN32
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#undef EAGAIN
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#define EAGAIN WSAEWOULDBLOCK
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#undef EINTR
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#define EINTR WSAEINTR
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#undef EINPROGRESS
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#define EINPROGRESS WSAEINPROGRESS
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#undef EPIPE
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#define EPIPE WSAECONNRESET
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#endif
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/* The amount of read bufferring that we allow for uTP sockets. */
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#define UTP_READ_BUFFER_SIZE (256 * 1024)
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static size_t guessPacketOverhead(size_t d)
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{
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/**
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* http://sd.wareonearth.com/~phil/net/overhead/
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*
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* TCP over Ethernet:
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* Assuming no header compression (e.g. not PPP)
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* Add 20 IPv4 header or 40 IPv6 header (no options)
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* Add 20 TCP header
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* Add 12 bytes optional TCP timestamps
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* Max TCP Payload data rates over ethernet are thus:
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* (1500-40)/ (38+1500) = 94.9285 % IPv4, minimal headers
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* (1500-52)/ (38+1500) = 94.1482 % IPv4, TCP timestamps
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* (1500-52)/ (42+1500) = 93.9040 % 802.1q, IPv4, TCP timestamps
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* (1500-60)/ (38+1500) = 93.6281 % IPv6, minimal headers
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* (1500-72)/ (38+1500) = 92.8479 % IPv6, TCP timestamps
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* (1500-72)/ (42+1500) = 92.6070 % 802.1q, IPv6, ICP timestamps
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*/
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double const assumed_payload_data_rate = 94.0;
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return (unsigned int)(d * (100.0 / assumed_payload_data_rate) - d);
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}
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/**
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***
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**/
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#define dbgmsg(io, ...) \
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do \
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{ \
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if (tr_logGetDeepEnabled()) \
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{ \
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char addrstr[TR_ADDRSTRLEN]; \
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tr_peerIoGetAddrStr(io, addrstr, sizeof(addrstr)); \
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tr_logAddDeep(__FILE__, __LINE__, addrstr, __VA_ARGS__); \
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} \
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} while (0)
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/**
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***
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**/
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struct tr_datatype
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{
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struct tr_datatype* next;
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size_t length;
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bool isPieceData;
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};
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static struct tr_datatype* datatype_pool = nullptr;
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static struct tr_datatype* datatype_new(void)
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{
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tr_datatype* ret = nullptr;
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if (datatype_pool == nullptr)
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{
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ret = tr_new(struct tr_datatype, 1);
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}
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else
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{
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ret = datatype_pool;
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datatype_pool = datatype_pool->next;
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}
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*ret = {};
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return ret;
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}
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static void datatype_free(struct tr_datatype* datatype)
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{
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datatype->next = datatype_pool;
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datatype_pool = datatype;
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}
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static void peer_io_pull_datatype(tr_peerIo* io)
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{
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auto* const tmp = io->outbuf_datatypes;
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if (tmp != nullptr)
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{
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io->outbuf_datatypes = tmp->next;
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datatype_free(tmp);
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}
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}
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static void peer_io_push_datatype(tr_peerIo* io, struct tr_datatype* datatype)
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{
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tr_datatype* tmp = io->outbuf_datatypes;
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if (tmp != nullptr)
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{
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while (tmp->next != nullptr)
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{
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tmp = tmp->next;
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}
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tmp->next = datatype;
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}
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else
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{
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io->outbuf_datatypes = datatype;
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}
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}
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/***
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****
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***/
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static void didWriteWrapper(tr_peerIo* io, unsigned int bytes_transferred)
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{
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while (bytes_transferred != 0 && tr_isPeerIo(io) && io->outbuf_datatypes != nullptr)
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{
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struct tr_datatype* next = io->outbuf_datatypes;
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unsigned int const payload = std::min(uint64_t{ next->length }, uint64_t{ bytes_transferred });
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/* For uTP sockets, the overhead is computed in utp_on_overhead. */
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unsigned int const overhead = io->socket.type == TR_PEER_SOCKET_TYPE_TCP ? guessPacketOverhead(payload) : 0;
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uint64_t const now = tr_time_msec();
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io->bandwidth->notifyBandwidthConsumed(TR_UP, payload, next->isPieceData, now);
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if (overhead > 0)
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{
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io->bandwidth->notifyBandwidthConsumed(TR_UP, overhead, false, now);
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}
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if (io->didWrite != nullptr)
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{
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io->didWrite(io, payload, next->isPieceData, io->userData);
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}
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if (tr_isPeerIo(io))
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{
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bytes_transferred -= payload;
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next->length -= payload;
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if (next->length == 0)
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{
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peer_io_pull_datatype(io);
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}
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}
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}
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}
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static void canReadWrapper(tr_peerIo* io)
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{
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dbgmsg(io, "canRead");
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tr_peerIoRef(io);
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tr_session* const session = io->session;
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/* try to consume the input buffer */
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if (io->canRead != nullptr)
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{
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tr_sessionLock(session);
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auto const now = tr_time_msec();
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auto done = bool{ false };
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auto err = bool{ false };
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while (!done && !err)
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{
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size_t piece = 0;
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size_t const oldLen = evbuffer_get_length(io->inbuf);
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int const ret = io->canRead(io, io->userData, &piece);
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size_t const used = oldLen - evbuffer_get_length(io->inbuf);
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unsigned int const overhead = guessPacketOverhead(used);
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if (piece != 0 || piece != used)
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{
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if (piece != 0)
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{
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io->bandwidth->notifyBandwidthConsumed(TR_DOWN, piece, true, now);
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}
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if (used != piece)
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{
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io->bandwidth->notifyBandwidthConsumed(TR_DOWN, used - piece, false, now);
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}
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}
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if (overhead > 0)
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{
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io->bandwidth->notifyBandwidthConsumed(TR_UP, overhead, false, now);
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}
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switch (ret)
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{
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case READ_NOW:
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if (evbuffer_get_length(io->inbuf) != 0)
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{
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continue;
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}
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done = true;
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break;
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case READ_LATER:
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done = true;
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break;
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case READ_ERR:
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err = true;
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break;
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}
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TR_ASSERT(tr_isPeerIo(io));
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}
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tr_sessionUnlock(session);
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}
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tr_peerIoUnref(io);
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}
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static void event_read_cb(evutil_socket_t fd, short /*event*/, void* vio)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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TR_ASSERT(io->socket.type == TR_PEER_SOCKET_TYPE_TCP);
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/* Limit the input buffer to 256K, so it doesn't grow too large */
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tr_direction const dir = TR_DOWN;
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unsigned int const max = 256 * 1024;
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io->pendingEvents &= ~EV_READ;
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unsigned int const curlen = evbuffer_get_length(io->inbuf);
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unsigned int howmuch = curlen >= max ? 0 : max - curlen;
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howmuch = io->bandwidth->clamp(TR_DOWN, howmuch);
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dbgmsg(io, "libevent says this peer is ready to read");
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/* if we don't have any bandwidth left, stop reading */
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if (howmuch < 1)
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{
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tr_peerIoSetEnabled(io, dir, false);
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return;
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}
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EVUTIL_SET_SOCKET_ERROR(0);
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auto const res = evbuffer_read(io->inbuf, fd, (int)howmuch);
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int const e = EVUTIL_SOCKET_ERROR();
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if (res > 0)
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{
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tr_peerIoSetEnabled(io, dir, true);
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/* Invoke the user callback - must always be called last */
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canReadWrapper(io);
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}
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else
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{
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short what = BEV_EVENT_READING;
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if (res == 0) /* EOF */
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{
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what |= BEV_EVENT_EOF;
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}
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else if (res == -1)
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{
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if (e == EAGAIN || e == EINTR)
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{
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tr_peerIoSetEnabled(io, dir, true);
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return;
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}
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what |= BEV_EVENT_ERROR;
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}
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char errstr[512];
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dbgmsg(
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io,
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"event_read_cb got an error. res is %d, what is %hd, errno is %d (%s)",
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res,
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what,
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e,
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tr_net_strerror(errstr, sizeof(errstr), e));
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if (io->gotError != nullptr)
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{
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io->gotError(io, what, io->userData);
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}
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}
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}
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static int tr_evbuffer_write(tr_peerIo* io, int fd, size_t howmuch)
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{
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char errstr[256];
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EVUTIL_SET_SOCKET_ERROR(0);
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int const n = evbuffer_write_atmost(io->outbuf, fd, howmuch);
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int const e = EVUTIL_SOCKET_ERROR();
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dbgmsg(io, "wrote %d to peer (%s)", n, (n == -1 ? tr_net_strerror(errstr, sizeof(errstr), e) : ""));
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return n;
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}
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static void event_write_cb(evutil_socket_t fd, short /*event*/, void* vio)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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TR_ASSERT(io->socket.type == TR_PEER_SOCKET_TYPE_TCP);
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auto const dir = TR_UP;
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auto res = int{ 0 };
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auto what = short{ BEV_EVENT_WRITING };
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io->pendingEvents &= ~EV_WRITE;
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dbgmsg(io, "libevent says this peer is ready to write");
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/* Write as much as possible, since the socket is non-blocking, write() will
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* return if it can't write any more data without blocking */
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size_t const howmuch = io->bandwidth->clamp(dir, evbuffer_get_length(io->outbuf));
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/* if we don't have any bandwidth left, stop writing */
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if (howmuch < 1)
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{
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tr_peerIoSetEnabled(io, dir, false);
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return;
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}
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EVUTIL_SET_SOCKET_ERROR(0);
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res = tr_evbuffer_write(io, fd, howmuch);
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int const e = EVUTIL_SOCKET_ERROR();
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if (res == -1)
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{
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if (e == 0 || e == EAGAIN || e == EINTR || e == EINPROGRESS)
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{
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goto RESCHEDULE;
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}
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/* error case */
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what |= BEV_EVENT_ERROR;
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}
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else if (res == 0)
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{
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/* eof case */
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what |= BEV_EVENT_EOF;
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}
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if (res <= 0)
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{
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goto FAIL;
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}
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if (evbuffer_get_length(io->outbuf) != 0)
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{
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tr_peerIoSetEnabled(io, dir, true);
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}
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didWriteWrapper(io, res);
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return;
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RESCHEDULE:
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if (evbuffer_get_length(io->outbuf) != 0)
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{
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tr_peerIoSetEnabled(io, dir, true);
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}
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return;
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FAIL:
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char errstr[1024];
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tr_net_strerror(errstr, sizeof(errstr), e);
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dbgmsg(io, "event_write_cb got an error. res is %d, what is %hd, errno is %d (%s)", res, what, e, errstr);
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if (io->gotError != nullptr)
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{
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io->gotError(io, what, io->userData);
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}
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}
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/**
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***
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**/
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static void maybeSetCongestionAlgorithm(tr_socket_t socket, char const* algorithm)
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{
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if (!tr_str_is_empty(algorithm))
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{
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tr_netSetCongestionControl(socket, algorithm);
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}
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}
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#ifdef WITH_UTP
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/* UTP callbacks */
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static void utp_on_read(void* vio, unsigned char const* buf, size_t buflen)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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int rc = evbuffer_add(io->inbuf, buf, buflen);
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dbgmsg(io, "utp_on_read got %zu bytes", buflen);
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if (rc < 0)
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{
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tr_logAddNamedError("UTP", "On read evbuffer_add");
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return;
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}
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tr_peerIoSetEnabled(io, TR_DOWN, true);
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canReadWrapper(io);
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}
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static void utp_on_write(void* vio, unsigned char* buf, size_t buflen)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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int rc = evbuffer_remove(io->outbuf, buf, buflen);
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dbgmsg(io, "utp_on_write sending %zu bytes... evbuffer_remove returned %d", buflen, rc);
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TR_ASSERT(rc == (int)buflen); /* if this fails, we've corrupted our bookkeeping somewhere */
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if (rc < (long)buflen)
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{
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tr_logAddNamedError("UTP", "Short write: %d < %ld", rc, (long)buflen);
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}
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didWriteWrapper(io, buflen);
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}
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static size_t utp_get_rb_size(void* vio)
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{
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auto const* const io = static_cast<tr_peerIo const*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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size_t bytes = io->bandwidth->clamp(TR_DOWN, UTP_READ_BUFFER_SIZE);
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dbgmsg(io, "utp_get_rb_size is saying it's ready to read %zu bytes", bytes);
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return UTP_READ_BUFFER_SIZE - bytes;
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}
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static int tr_peerIoTryWrite(tr_peerIo* io, size_t howmuch);
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static void utp_on_writable(tr_peerIo* io)
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{
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dbgmsg(io, "libutp says this peer is ready to write");
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int const n = tr_peerIoTryWrite(io, SIZE_MAX);
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tr_peerIoSetEnabled(io, TR_UP, n != 0 && evbuffer_get_length(io->outbuf) != 0);
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}
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static void utp_on_state_change(void* vio, int state)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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if (state == UTP_STATE_CONNECT)
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{
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dbgmsg(io, "utp_on_state_change -- changed to connected");
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io->utpSupported = true;
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}
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else if (state == UTP_STATE_WRITABLE)
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{
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dbgmsg(io, "utp_on_state_change -- changed to writable");
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if ((io->pendingEvents & EV_WRITE) != 0)
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{
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utp_on_writable(io);
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}
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}
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else if (state == UTP_STATE_EOF)
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{
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if (io->gotError != nullptr)
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{
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io->gotError(io, BEV_EVENT_EOF, io->userData);
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}
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}
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else if (state == UTP_STATE_DESTROYING)
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{
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tr_logAddNamedError("UTP", "Impossible state UTP_STATE_DESTROYING");
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return;
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}
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else
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{
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tr_logAddNamedError("UTP", "Unknown state %d", state);
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}
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}
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static void utp_on_error(void* vio, int errcode)
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{
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auto* io = static_cast<tr_peerIo*>(vio);
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TR_ASSERT(tr_isPeerIo(io));
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dbgmsg(io, "utp_on_error -- errcode is %d", errcode);
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if (io->gotError != nullptr)
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{
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errno = errcode;
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io->gotError(io, BEV_EVENT_ERROR, io->userData);
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}
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}
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static void utp_on_overhead(void* vio, bool send, size_t count, int /*type*/)
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{
|
|
auto* io = static_cast<tr_peerIo*>(vio);
|
|
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
dbgmsg(io, "utp_on_overhead -- count is %zu", count);
|
|
|
|
io->bandwidth->notifyBandwidthConsumed(send ? TR_UP : TR_DOWN, count, false, tr_time_msec());
|
|
}
|
|
|
|
static auto utp_function_table = UTPFunctionTable{
|
|
utp_on_read, utp_on_write, utp_get_rb_size, utp_on_state_change, utp_on_error, utp_on_overhead,
|
|
};
|
|
|
|
/* Dummy UTP callbacks. */
|
|
/* We switch a UTP socket to use these after the associated peerIo has been
|
|
destroyed -- see io_dtor. */
|
|
|
|
static void dummy_read(void* /*closure*/, unsigned char const* /*buf*/, size_t /*buflen*/)
|
|
{
|
|
/* This cannot happen, as far as I'm aware. */
|
|
tr_logAddNamedError("UTP", "On_read called on closed socket");
|
|
}
|
|
|
|
static void dummy_write(void* /*closure*/, unsigned char* buf, size_t buflen)
|
|
{
|
|
/* This can very well happen if we've shut down a peer connection that
|
|
had unflushed buffers. Complain and send zeroes. */
|
|
tr_logAddNamedDbg("UTP", "On_write called on closed socket");
|
|
memset(buf, 0, buflen);
|
|
}
|
|
|
|
static size_t dummy_get_rb_size(void* /*closure*/)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void dummy_on_state_change(void* /*closure*/, int /*state*/)
|
|
{
|
|
}
|
|
|
|
static void dummy_on_error(void* /*closure*/, int /*errcode*/)
|
|
{
|
|
}
|
|
|
|
static void dummy_on_overhead(void* /*closure*/, bool /*send*/, size_t /*count*/, int /*type*/)
|
|
{
|
|
}
|
|
|
|
static auto dummy_utp_function_table = UTPFunctionTable{
|
|
dummy_read, dummy_write, dummy_get_rb_size, dummy_on_state_change, dummy_on_error, dummy_on_overhead,
|
|
};
|
|
|
|
#endif /* #ifdef WITH_UTP */
|
|
|
|
static tr_peerIo* tr_peerIoNew(
|
|
tr_session* session,
|
|
Bandwidth* parent,
|
|
tr_address const* addr,
|
|
tr_port port,
|
|
uint8_t const* torrentHash,
|
|
bool isIncoming,
|
|
bool isSeed,
|
|
struct tr_peer_socket const socket)
|
|
{
|
|
TR_ASSERT(session != nullptr);
|
|
TR_ASSERT(session->events != nullptr);
|
|
TR_ASSERT(tr_amInEventThread(session));
|
|
|
|
#ifdef WITH_UTP
|
|
TR_ASSERT(socket.type == TR_PEER_SOCKET_TYPE_TCP || socket.type == TR_PEER_SOCKET_TYPE_UTP);
|
|
#else
|
|
TR_ASSERT(socket.type == TR_PEER_SOCKET_TYPE_TCP);
|
|
#endif
|
|
|
|
if (socket.type == TR_PEER_SOCKET_TYPE_TCP)
|
|
{
|
|
tr_netSetTOS(socket.handle.tcp, session->peerSocketTOS, addr->type);
|
|
maybeSetCongestionAlgorithm(socket.handle.tcp, session->peer_congestion_algorithm);
|
|
}
|
|
|
|
auto* io = new tr_peerIo{ session, *addr, port, isSeed };
|
|
tr_cryptoConstruct(&io->crypto, torrentHash, isIncoming);
|
|
io->socket = socket;
|
|
io->bandwidth = new Bandwidth(parent);
|
|
io->bandwidth->setPeer(io);
|
|
dbgmsg(io, "bandwidth is %p; its parent is %p", (void*)&io->bandwidth, (void*)parent);
|
|
|
|
switch (socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
dbgmsg(io, "socket (tcp) is %" PRIdMAX, (intmax_t)socket.handle.tcp);
|
|
io->event_read = event_new(session->event_base, socket.handle.tcp, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new(session->event_base, socket.handle.tcp, EV_WRITE, event_write_cb, io);
|
|
break;
|
|
|
|
#ifdef WITH_UTP
|
|
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
dbgmsg(io, "socket (utp) is %p", (void*)socket.handle.utp);
|
|
UTP_SetSockopt(socket.handle.utp, SO_RCVBUF, UTP_READ_BUFFER_SIZE);
|
|
dbgmsg(io, "%s", "calling UTP_SetCallbacks &utp_function_table");
|
|
UTP_SetCallbacks(socket.handle.utp, &utp_function_table, io);
|
|
|
|
if (!isIncoming)
|
|
{
|
|
dbgmsg(io, "%s", "calling UTP_Connect");
|
|
UTP_Connect(socket.handle.utp);
|
|
}
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, "unsupported peer socket type %d", socket.type);
|
|
}
|
|
|
|
return io;
|
|
}
|
|
|
|
tr_peerIo* tr_peerIoNewIncoming(
|
|
tr_session* session,
|
|
Bandwidth* parent,
|
|
tr_address const* addr,
|
|
tr_port port,
|
|
struct tr_peer_socket const socket)
|
|
{
|
|
TR_ASSERT(session != nullptr);
|
|
TR_ASSERT(tr_address_is_valid(addr));
|
|
|
|
return tr_peerIoNew(session, parent, addr, port, nullptr, true, false, socket);
|
|
}
|
|
|
|
tr_peerIo* tr_peerIoNewOutgoing(
|
|
tr_session* session,
|
|
Bandwidth* parent,
|
|
tr_address const* addr,
|
|
tr_port port,
|
|
uint8_t const* torrentHash,
|
|
bool isSeed,
|
|
bool utp)
|
|
{
|
|
TR_ASSERT(session != nullptr);
|
|
TR_ASSERT(tr_address_is_valid(addr));
|
|
TR_ASSERT(torrentHash != nullptr);
|
|
|
|
auto socket = tr_peer_socket{};
|
|
|
|
if (utp)
|
|
{
|
|
socket = tr_netOpenPeerUTPSocket(session, addr, port, isSeed);
|
|
}
|
|
|
|
if (socket.type == TR_PEER_SOCKET_TYPE_NONE)
|
|
{
|
|
socket = tr_netOpenPeerSocket(session, addr, port, isSeed);
|
|
dbgmsg(
|
|
nullptr,
|
|
"tr_netOpenPeerSocket returned fd %" PRIdMAX,
|
|
(intmax_t)(socket.type != TR_PEER_SOCKET_TYPE_NONE ? socket.handle.tcp : TR_BAD_SOCKET));
|
|
}
|
|
|
|
if (socket.type == TR_PEER_SOCKET_TYPE_NONE)
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
return tr_peerIoNew(session, parent, addr, port, torrentHash, false, isSeed, socket);
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static void event_enable(tr_peerIo* io, short event)
|
|
{
|
|
TR_ASSERT(tr_amInEventThread(io->session));
|
|
TR_ASSERT(io->session != nullptr);
|
|
TR_ASSERT(io->session->events != nullptr);
|
|
|
|
bool const need_events = io->socket.type == TR_PEER_SOCKET_TYPE_TCP;
|
|
|
|
if (need_events)
|
|
{
|
|
TR_ASSERT(event_initialized(io->event_read));
|
|
TR_ASSERT(event_initialized(io->event_write));
|
|
}
|
|
|
|
if ((event & EV_READ) != 0 && (io->pendingEvents & EV_READ) == 0)
|
|
{
|
|
dbgmsg(io, "enabling ready-to-read polling");
|
|
|
|
if (need_events)
|
|
{
|
|
event_add(io->event_read, nullptr);
|
|
}
|
|
|
|
io->pendingEvents |= EV_READ;
|
|
}
|
|
|
|
if ((event & EV_WRITE) != 0 && (io->pendingEvents & EV_WRITE) == 0)
|
|
{
|
|
dbgmsg(io, "enabling ready-to-write polling");
|
|
|
|
if (need_events)
|
|
{
|
|
event_add(io->event_write, nullptr);
|
|
}
|
|
|
|
io->pendingEvents |= EV_WRITE;
|
|
}
|
|
}
|
|
|
|
static void event_disable(tr_peerIo* io, short event)
|
|
{
|
|
TR_ASSERT(tr_amInEventThread(io->session));
|
|
TR_ASSERT(io->session != nullptr);
|
|
TR_ASSERT(io->session->events != nullptr);
|
|
|
|
bool const need_events = io->socket.type == TR_PEER_SOCKET_TYPE_TCP;
|
|
|
|
if (need_events)
|
|
{
|
|
TR_ASSERT(event_initialized(io->event_read));
|
|
TR_ASSERT(event_initialized(io->event_write));
|
|
}
|
|
|
|
if ((event & EV_READ) != 0 && (io->pendingEvents & EV_READ) != 0)
|
|
{
|
|
dbgmsg(io, "disabling ready-to-read polling");
|
|
|
|
if (need_events)
|
|
{
|
|
event_del(io->event_read);
|
|
}
|
|
|
|
io->pendingEvents &= ~EV_READ;
|
|
}
|
|
|
|
if ((event & EV_WRITE) != 0 && (io->pendingEvents & EV_WRITE) != 0)
|
|
{
|
|
dbgmsg(io, "disabling ready-to-write polling");
|
|
|
|
if (need_events)
|
|
{
|
|
event_del(io->event_write);
|
|
}
|
|
|
|
io->pendingEvents &= ~EV_WRITE;
|
|
}
|
|
}
|
|
|
|
void tr_peerIoSetEnabled(tr_peerIo* io, tr_direction dir, bool isEnabled)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(tr_isDirection(dir));
|
|
TR_ASSERT(tr_amInEventThread(io->session));
|
|
TR_ASSERT(io->session->events != nullptr);
|
|
|
|
short const event = dir == TR_UP ? EV_WRITE : EV_READ;
|
|
|
|
if (isEnabled)
|
|
{
|
|
event_enable(io, event);
|
|
}
|
|
else
|
|
{
|
|
event_disable(io, event);
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static void io_close_socket(tr_peerIo* io)
|
|
{
|
|
switch (io->socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_NONE:
|
|
break;
|
|
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
tr_netClose(io->session, io->socket.handle.tcp);
|
|
break;
|
|
|
|
#ifdef WITH_UTP
|
|
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
UTP_SetCallbacks(io->socket.handle.utp, &dummy_utp_function_table, nullptr);
|
|
UTP_Close(io->socket.handle.utp);
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, "unsupported peer socket type %d", io->socket.type);
|
|
}
|
|
|
|
io->socket = {};
|
|
|
|
if (io->event_read != nullptr)
|
|
{
|
|
event_free(io->event_read);
|
|
io->event_read = nullptr;
|
|
}
|
|
|
|
if (io->event_write != nullptr)
|
|
{
|
|
event_free(io->event_write);
|
|
io->event_write = nullptr;
|
|
}
|
|
}
|
|
|
|
static void io_dtor(void* vio)
|
|
{
|
|
auto* io = static_cast<tr_peerIo*>(vio);
|
|
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(tr_amInEventThread(io->session));
|
|
TR_ASSERT(io->session->events != nullptr);
|
|
|
|
dbgmsg(io, "in tr_peerIo destructor");
|
|
event_disable(io, EV_READ | EV_WRITE);
|
|
delete io->bandwidth;
|
|
io_close_socket(io);
|
|
tr_cryptoDestruct(&io->crypto);
|
|
|
|
while (io->outbuf_datatypes != nullptr)
|
|
{
|
|
peer_io_pull_datatype(io);
|
|
}
|
|
|
|
io->magic_number = ~0;
|
|
delete io;
|
|
}
|
|
|
|
static void tr_peerIoFree(tr_peerIo* io)
|
|
{
|
|
if (io != nullptr)
|
|
{
|
|
dbgmsg(io, "in tr_peerIoFree");
|
|
io->canRead = nullptr;
|
|
io->didWrite = nullptr;
|
|
io->gotError = nullptr;
|
|
tr_runInEventThread(io->session, io_dtor, io);
|
|
}
|
|
}
|
|
|
|
void tr_peerIoRefImpl(char const* file, int line, tr_peerIo* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
dbgmsg(io, "%s:%d is incrementing the IO's refcount from %d to %d", file, line, io->refCount, io->refCount + 1);
|
|
|
|
++io->refCount;
|
|
}
|
|
|
|
void tr_peerIoUnrefImpl(char const* file, int line, tr_peerIo* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
dbgmsg(io, "%s:%d is decrementing the IO's refcount from %d to %d", file, line, io->refCount, io->refCount - 1);
|
|
|
|
if (--io->refCount == 0)
|
|
{
|
|
tr_peerIoFree(io);
|
|
}
|
|
}
|
|
|
|
tr_address const* tr_peerIoGetAddress(tr_peerIo const* io, tr_port* port)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
if (port != nullptr)
|
|
{
|
|
*port = io->port;
|
|
}
|
|
|
|
return &io->addr;
|
|
}
|
|
|
|
char const* tr_peerIoGetAddrStr(tr_peerIo const* io, char* buf, size_t buflen)
|
|
{
|
|
if (tr_isPeerIo(io))
|
|
{
|
|
tr_address_and_port_to_string(buf, buflen, &io->addr, io->port);
|
|
}
|
|
else
|
|
{
|
|
tr_strlcpy(buf, "error", buflen);
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
void tr_peerIoSetIOFuncs(tr_peerIo* io, tr_can_read_cb readcb, tr_did_write_cb writecb, tr_net_error_cb errcb, void* userData)
|
|
{
|
|
io->canRead = readcb;
|
|
io->didWrite = writecb;
|
|
io->gotError = errcb;
|
|
io->userData = userData;
|
|
}
|
|
|
|
void tr_peerIoClear(tr_peerIo* io)
|
|
{
|
|
tr_peerIoSetIOFuncs(io, nullptr, nullptr, nullptr, nullptr);
|
|
tr_peerIoSetEnabled(io, TR_UP, false);
|
|
tr_peerIoSetEnabled(io, TR_DOWN, false);
|
|
}
|
|
|
|
int tr_peerIoReconnect(tr_peerIo* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(!tr_peerIoIsIncoming(io));
|
|
|
|
tr_session* session = tr_peerIoGetSession(io);
|
|
|
|
short int pendingEvents = io->pendingEvents;
|
|
event_disable(io, EV_READ | EV_WRITE);
|
|
|
|
io_close_socket(io);
|
|
|
|
io->socket = tr_netOpenPeerSocket(session, &io->addr, io->port, io->isSeed);
|
|
|
|
if (io->socket.type != TR_PEER_SOCKET_TYPE_TCP)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
io->event_read = event_new(session->event_base, io->socket.handle.tcp, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new(session->event_base, io->socket.handle.tcp, EV_WRITE, event_write_cb, io);
|
|
|
|
event_enable(io, pendingEvents);
|
|
tr_netSetTOS(io->socket.handle.tcp, session->peerSocketTOS, io->addr.type);
|
|
maybeSetCongestionAlgorithm(io->socket.handle.tcp, session->peer_congestion_algorithm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void tr_peerIoSetTorrentHash(tr_peerIo* io, uint8_t const* hash)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
tr_cryptoSetTorrentHash(&io->crypto, hash);
|
|
}
|
|
|
|
uint8_t const* tr_peerIoGetTorrentHash(tr_peerIo* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
return tr_cryptoGetTorrentHash(&io->crypto);
|
|
}
|
|
|
|
bool tr_peerIoHasTorrentHash(tr_peerIo const* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
|
|
return tr_cryptoHasTorrentHash(&io->crypto);
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static unsigned int getDesiredOutputBufferSize(tr_peerIo const* io, uint64_t now)
|
|
{
|
|
/* this is all kind of arbitrary, but what seems to work well is
|
|
* being large enough to hold the next 20 seconds' worth of input,
|
|
* or a few blocks, whichever is bigger.
|
|
* It's okay to tweak this as needed */
|
|
unsigned int const currentSpeed_Bps = io->bandwidth->getPieceSpeedBytesPerSecond(now, TR_UP);
|
|
unsigned int const period = 15U; /* arbitrary */
|
|
/* the 3 is arbitrary; the .5 is to leave room for messages */
|
|
static auto const ceiling = (unsigned int)(MAX_BLOCK_SIZE * 3.5);
|
|
return std::max(ceiling, currentSpeed_Bps * period);
|
|
}
|
|
|
|
size_t tr_peerIoGetWriteBufferSpace(tr_peerIo const* io, uint64_t now)
|
|
{
|
|
size_t const desiredLen = getDesiredOutputBufferSize(io, now);
|
|
size_t const currentLen = evbuffer_get_length(io->outbuf);
|
|
size_t freeSpace = 0;
|
|
|
|
if (desiredLen > currentLen)
|
|
{
|
|
freeSpace = desiredLen - currentLen;
|
|
}
|
|
|
|
return freeSpace;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void tr_peerIoSetEncryption(tr_peerIo* io, tr_encryption_type encryption_type)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(encryption_type == PEER_ENCRYPTION_NONE || encryption_type == PEER_ENCRYPTION_RC4);
|
|
|
|
io->encryption_type = encryption_type;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static inline void processBuffer(
|
|
tr_crypto* crypto,
|
|
struct evbuffer* buffer,
|
|
size_t offset,
|
|
size_t size,
|
|
void (*callback)(tr_crypto*, size_t, void const*, void*))
|
|
{
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_iovec iovec;
|
|
|
|
evbuffer_ptr_set(buffer, &pos, offset, EVBUFFER_PTR_SET);
|
|
|
|
do
|
|
{
|
|
if (evbuffer_peek(buffer, size, &pos, &iovec, 1) <= 0)
|
|
{
|
|
break;
|
|
}
|
|
|
|
callback(crypto, iovec.iov_len, iovec.iov_base, iovec.iov_base);
|
|
|
|
TR_ASSERT(size >= iovec.iov_len);
|
|
size -= iovec.iov_len;
|
|
} while (evbuffer_ptr_set(buffer, &pos, iovec.iov_len, EVBUFFER_PTR_ADD) == 0);
|
|
|
|
TR_ASSERT(size == 0);
|
|
}
|
|
|
|
static void addDatatype(tr_peerIo* io, size_t byteCount, bool isPieceData)
|
|
{
|
|
auto* const d = datatype_new();
|
|
d->isPieceData = isPieceData;
|
|
d->length = byteCount;
|
|
peer_io_push_datatype(io, d);
|
|
}
|
|
|
|
static inline void maybeEncryptBuffer(tr_peerIo* io, struct evbuffer* buf, size_t offset, size_t size)
|
|
{
|
|
if (io->encryption_type == PEER_ENCRYPTION_RC4)
|
|
{
|
|
processBuffer(&io->crypto, buf, offset, size, &tr_cryptoEncrypt);
|
|
}
|
|
}
|
|
|
|
void tr_peerIoWriteBuf(tr_peerIo* io, struct evbuffer* buf, bool isPieceData)
|
|
{
|
|
size_t const byteCount = evbuffer_get_length(buf);
|
|
maybeEncryptBuffer(io, buf, 0, byteCount);
|
|
evbuffer_add_buffer(io->outbuf, buf);
|
|
addDatatype(io, byteCount, isPieceData);
|
|
}
|
|
|
|
void tr_peerIoWriteBytes(tr_peerIo* io, void const* bytes, size_t byteCount, bool isPieceData)
|
|
{
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_reserve_space(io->outbuf, byteCount, &iovec, 1);
|
|
|
|
iovec.iov_len = byteCount;
|
|
|
|
if (io->encryption_type == PEER_ENCRYPTION_RC4)
|
|
{
|
|
tr_cryptoEncrypt(&io->crypto, iovec.iov_len, bytes, iovec.iov_base);
|
|
}
|
|
else
|
|
{
|
|
memcpy(iovec.iov_base, bytes, iovec.iov_len);
|
|
}
|
|
|
|
evbuffer_commit_space(io->outbuf, &iovec, 1);
|
|
|
|
addDatatype(io, byteCount, isPieceData);
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void evbuffer_add_uint8(struct evbuffer* outbuf, uint8_t addme)
|
|
{
|
|
evbuffer_add(outbuf, &addme, 1);
|
|
}
|
|
|
|
void evbuffer_add_uint16(struct evbuffer* outbuf, uint16_t addme_hs)
|
|
{
|
|
uint16_t const ns = htons(addme_hs);
|
|
evbuffer_add(outbuf, &ns, sizeof(ns));
|
|
}
|
|
|
|
void evbuffer_add_uint32(struct evbuffer* outbuf, uint32_t addme_hl)
|
|
{
|
|
uint32_t const nl = htonl(addme_hl);
|
|
evbuffer_add(outbuf, &nl, sizeof(nl));
|
|
}
|
|
|
|
void evbuffer_add_uint64(struct evbuffer* outbuf, uint64_t addme_hll)
|
|
{
|
|
uint64_t const nll = tr_htonll(addme_hll);
|
|
evbuffer_add(outbuf, &nll, sizeof(nll));
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static inline void maybeDecryptBuffer(tr_peerIo* io, struct evbuffer* buf, size_t offset, size_t size)
|
|
{
|
|
if (io->encryption_type == PEER_ENCRYPTION_RC4)
|
|
{
|
|
processBuffer(&io->crypto, buf, offset, size, &tr_cryptoDecrypt);
|
|
}
|
|
}
|
|
|
|
void tr_peerIoReadBytesToBuf(tr_peerIo* io, struct evbuffer* inbuf, struct evbuffer* outbuf, size_t byteCount)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(evbuffer_get_length(inbuf) >= byteCount);
|
|
|
|
size_t const old_length = evbuffer_get_length(outbuf);
|
|
|
|
/* append it to outbuf */
|
|
struct evbuffer* tmp = evbuffer_new();
|
|
evbuffer_remove_buffer(inbuf, tmp, byteCount);
|
|
evbuffer_add_buffer(outbuf, tmp);
|
|
evbuffer_free(tmp);
|
|
|
|
maybeDecryptBuffer(io, outbuf, old_length, byteCount);
|
|
}
|
|
|
|
void tr_peerIoReadBytes(tr_peerIo* io, struct evbuffer* inbuf, void* bytes, size_t byteCount)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(evbuffer_get_length(inbuf) >= byteCount);
|
|
|
|
switch (io->encryption_type)
|
|
{
|
|
case PEER_ENCRYPTION_NONE:
|
|
evbuffer_remove(inbuf, bytes, byteCount);
|
|
break;
|
|
|
|
case PEER_ENCRYPTION_RC4:
|
|
evbuffer_remove(inbuf, bytes, byteCount);
|
|
tr_cryptoDecrypt(&io->crypto, byteCount, bytes, bytes);
|
|
break;
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, "unhandled encryption type %d", (int)io->encryption_type);
|
|
}
|
|
}
|
|
|
|
void tr_peerIoReadUint16(tr_peerIo* io, struct evbuffer* inbuf, uint16_t* setme)
|
|
{
|
|
auto tmp = uint16_t{};
|
|
tr_peerIoReadBytes(io, inbuf, &tmp, sizeof(uint16_t));
|
|
*setme = ntohs(tmp);
|
|
}
|
|
|
|
void tr_peerIoReadUint32(tr_peerIo* io, struct evbuffer* inbuf, uint32_t* setme)
|
|
{
|
|
auto tmp = uint32_t{};
|
|
tr_peerIoReadBytes(io, inbuf, &tmp, sizeof(uint32_t));
|
|
*setme = ntohl(tmp);
|
|
}
|
|
|
|
void tr_peerIoDrain(tr_peerIo* io, struct evbuffer* inbuf, size_t byteCount)
|
|
{
|
|
char buf[4096];
|
|
size_t const buflen = sizeof(buf);
|
|
|
|
while (byteCount > 0)
|
|
{
|
|
size_t const thisPass = std::min(byteCount, buflen);
|
|
tr_peerIoReadBytes(io, inbuf, buf, thisPass);
|
|
byteCount -= thisPass;
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int tr_peerIoTryRead(tr_peerIo* io, size_t howmuch)
|
|
{
|
|
auto res = int{};
|
|
|
|
if ((howmuch = io->bandwidth->clamp(TR_DOWN, howmuch)) != 0)
|
|
{
|
|
switch (io->socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
/* UTP_RBDrained notifies libutp that your read buffer is emtpy.
|
|
* It opens up the congestion window by sending an ACK (soonish)
|
|
* if one was not going to be sent. */
|
|
if (evbuffer_get_length(io->inbuf) == 0)
|
|
{
|
|
UTP_RBDrained(io->socket.handle.utp);
|
|
}
|
|
|
|
break;
|
|
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
{
|
|
char err_buf[512];
|
|
|
|
EVUTIL_SET_SOCKET_ERROR(0);
|
|
res = evbuffer_read(io->inbuf, io->socket.handle.tcp, (int)howmuch);
|
|
int const e = EVUTIL_SOCKET_ERROR();
|
|
|
|
dbgmsg(io, "read %d from peer (%s)", res, res == -1 ? tr_net_strerror(err_buf, sizeof(err_buf), e) : "");
|
|
|
|
if (evbuffer_get_length(io->inbuf) != 0)
|
|
{
|
|
canReadWrapper(io);
|
|
}
|
|
|
|
if (res <= 0 && io->gotError != nullptr && e != EAGAIN && e != EINTR && e != EINPROGRESS)
|
|
{
|
|
short what = BEV_EVENT_READING | BEV_EVENT_ERROR;
|
|
|
|
if (res == 0)
|
|
{
|
|
what |= BEV_EVENT_EOF;
|
|
}
|
|
|
|
dbgmsg(
|
|
io,
|
|
"tr_peerIoTryRead got an error. res is %d, what is %hd, errno is %d (%s)",
|
|
res,
|
|
what,
|
|
e,
|
|
tr_net_strerror(err_buf, sizeof(err_buf), e));
|
|
|
|
io->gotError(io, what, io->userData);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, "unsupported peer socket type %d", io->socket.type);
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int tr_peerIoTryWrite(tr_peerIo* io, size_t howmuch)
|
|
{
|
|
auto const old_len = size_t{ evbuffer_get_length(io->outbuf) };
|
|
auto n = int{};
|
|
|
|
dbgmsg(io, "in tr_peerIoTryWrite %zu", howmuch);
|
|
|
|
if (howmuch > old_len)
|
|
{
|
|
howmuch = old_len;
|
|
}
|
|
|
|
if ((howmuch = io->bandwidth->clamp(TR_UP, howmuch)) != 0)
|
|
{
|
|
switch (io->socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
UTP_Write(io->socket.handle.utp, howmuch);
|
|
n = old_len - evbuffer_get_length(io->outbuf);
|
|
break;
|
|
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
{
|
|
EVUTIL_SET_SOCKET_ERROR(0);
|
|
n = tr_evbuffer_write(io, io->socket.handle.tcp, howmuch);
|
|
int const e = EVUTIL_SOCKET_ERROR();
|
|
|
|
if (n > 0)
|
|
{
|
|
didWriteWrapper(io, n);
|
|
}
|
|
|
|
if (n < 0 && io->gotError != nullptr && e != 0 && e != EPIPE && e != EAGAIN && e != EINTR && e != EINPROGRESS)
|
|
{
|
|
char errstr[512];
|
|
short const what = BEV_EVENT_WRITING | BEV_EVENT_ERROR;
|
|
|
|
dbgmsg(
|
|
io,
|
|
"tr_peerIoTryWrite got an error. res is %d, what is %hd, errno is %d (%s)",
|
|
n,
|
|
what,
|
|
e,
|
|
tr_net_strerror(errstr, sizeof(errstr), e));
|
|
|
|
io->gotError(io, what, io->userData);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, "unsupported peer socket type %d", io->socket.type);
|
|
}
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
int tr_peerIoFlush(tr_peerIo* io, tr_direction dir, size_t limit)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(tr_isDirection(dir));
|
|
|
|
int bytesUsed = 0;
|
|
|
|
if (dir == TR_DOWN)
|
|
{
|
|
bytesUsed = tr_peerIoTryRead(io, limit);
|
|
}
|
|
else
|
|
{
|
|
bytesUsed = tr_peerIoTryWrite(io, limit);
|
|
}
|
|
|
|
dbgmsg(io, "flushing peer-io, direction %d, limit %zu, notifyBandwidthConsumedBytes %d", (int)dir, limit, bytesUsed);
|
|
return bytesUsed;
|
|
}
|
|
|
|
int tr_peerIoFlushOutgoingProtocolMsgs(tr_peerIo* io)
|
|
{
|
|
size_t byteCount = 0;
|
|
|
|
/* count up how many bytes are used by non-piece-data messages
|
|
at the front of our outbound queue */
|
|
for (struct tr_datatype const* it = io->outbuf_datatypes; it != nullptr; it = it->next)
|
|
{
|
|
if (it->isPieceData)
|
|
{
|
|
break;
|
|
}
|
|
|
|
byteCount += it->length;
|
|
}
|
|
|
|
return tr_peerIoFlush(io, TR_UP, byteCount);
|
|
}
|