1174 lines
30 KiB
C++
1174 lines
30 KiB
C++
// This file Copyright © 2007-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <algorithm>
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#include <array>
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#include <cerrno>
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#include <cstdint>
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#include <cstring>
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#include <string>
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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 <fmt/format.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-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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static auto constexpr UtpReadBufferSize = 256 * 1024;
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#define tr_logAddErrorIo(io, msg) tr_logAddError(msg, (io)->addrStr())
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#define tr_logAddWarnIo(io, msg) tr_logAddWarn(msg, (io)->addrStr())
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#define tr_logAddDebugIo(io, msg) tr_logAddDebug(msg, (io)->addrStr())
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#define tr_logAddTraceIo(io, msg) tr_logAddTrace(msg, (io)->addrStr())
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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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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) && !std::empty(io->outbuf_info))
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{
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auto& [n_bytes_left, is_piece_data] = io->outbuf_info.front();
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unsigned int const payload = std::min(uint64_t{ n_bytes_left }, 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, is_piece_data, 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, is_piece_data, io->userData);
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}
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if (!tr_isPeerIo(io))
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{
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break;
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}
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bytes_transferred -= payload;
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n_bytes_left -= payload;
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if (n_bytes_left == 0)
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{
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io->outbuf_info.pop_front();
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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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tr_logAddTraceIo(io, "canRead");
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tr_peerIoRef(io);
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tr_session const* 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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auto const lock = session->unique_lock();
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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.get());
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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.get());
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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.get()) != 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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}
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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.get());
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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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tr_logAddTraceIo(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.get(), 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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tr_logAddDebugIo(
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io,
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fmt::format("event_read_cb err: res:{}, what:{}, errno:{} ({})", res, what, e, tr_net_strerror(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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EVUTIL_SET_SOCKET_ERROR(0);
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int const n = evbuffer_write_atmost(io->outbuf.get(), fd, howmuch);
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int const e = EVUTIL_SOCKET_ERROR();
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tr_logAddTraceIo(io, fmt::format("wrote {} to peer ({})", n, (n == -1 ? tr_net_strerror(e).c_str() : "")));
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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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tr_logAddTraceIo(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.get()));
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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.get()) != 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.get()) != 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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auto const errmsg = tr_net_strerror(e);
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tr_logAddDebugIo(io, fmt::format("event_write_cb got an err. res:{}, what:{}, errno:{} ({})", res, what, e, errmsg));
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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, std::string const& algorithm)
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{
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if (!std::empty(algorithm))
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{
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tr_netSetCongestionControl(socket, algorithm.c_str());
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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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void tr_peerIo::readBufferAdd(void const* data, size_t n_bytes)
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{
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if (auto const rc = evbuffer_add(inbuf.get(), data, n_bytes); rc < 0)
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{
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tr_logAddWarn(_("Couldn't write to peer"));
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return;
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}
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tr_peerIoSetEnabled(this, TR_DOWN, true);
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canReadWrapper(this);
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}
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static size_t utp_get_rb_size(tr_peerIo* const io)
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{
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size_t const bytes = io->bandwidth().clamp(TR_DOWN, UtpReadBufferSize);
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tr_logAddTraceIo(io, fmt::format("utp_get_rb_size is saying it's ready to read {} bytes", bytes));
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return UtpReadBufferSize - 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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tr_logAddTraceIo(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.get()) != 0);
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}
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static void utp_on_state_change(tr_peerIo* const io, int const state)
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{
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if (state == UTP_STATE_CONNECT)
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{
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tr_logAddTraceIo(io, "utp_on_state_change -- changed to connected");
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io->utp_supported_ = true;
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}
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else if (state == UTP_STATE_WRITABLE)
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{
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tr_logAddTraceIo(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_logAddErrorIo(io, "Impossible state UTP_STATE_DESTROYING");
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}
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else
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{
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tr_logAddErrorIo(io, fmt::format(_("Unknown state: {state}"), fmt::arg("state", state)));
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}
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}
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static void utp_on_error(tr_peerIo* const io, int const errcode)
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{
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tr_logAddDebugIo(io, fmt::format("utp_on_error -- errcode is {}", 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(tr_peerIo* const io, bool const send, size_t const count, int /*type*/)
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{
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tr_logAddTraceIo(io, fmt::format("utp_on_overhead -- count is {}", count));
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io->bandwidth().notifyBandwidthConsumed(send ? TR_UP : TR_DOWN, count, false, tr_time_msec());
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}
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static uint64 utp_callback(utp_callback_arguments* args)
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{
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auto* const io = static_cast<tr_peerIo*>(utp_get_userdata(args->socket));
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if (io == nullptr)
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{
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#ifdef TR_UTP_TRACE
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if (args->callback_type != UTP_ON_STATE_CHANGE || args->u1.state != UTP_STATE_DESTROYING)
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{
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fmt::print(
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stderr,
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FMT_STRING("[utp] [{}:{}] [{}] io is null! buf={}, len={}, flags={}, send/error_code/state={}, type={}\n"),
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fmt::ptr(args->context),
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fmt::ptr(args->socket),
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utp_callback_names[args->callback_type],
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fmt::ptr(args->buf),
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args->len,
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args->flags,
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args->u1.send,
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args->u2.type);
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}
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#endif
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return 0;
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}
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TR_ASSERT(tr_isPeerIo(io));
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TR_ASSERT(io->socket.handle.utp == args->socket);
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switch (args->callback_type)
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{
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case UTP_ON_READ:
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io->readBufferAdd(args->buf, args->len);
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break;
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case UTP_GET_READ_BUFFER_SIZE:
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return utp_get_rb_size(io);
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case UTP_ON_STATE_CHANGE:
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utp_on_state_change(io, args->u1.state);
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break;
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case UTP_ON_ERROR:
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utp_on_error(io, args->u1.error_code);
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break;
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case UTP_ON_OVERHEAD_STATISTICS:
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utp_on_overhead(io, args->u1.send != 0, args->len, args->u2.type);
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break;
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}
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return 0;
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}
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|
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#endif /* #ifdef WITH_UTP */
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|
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tr_peerIo* tr_peerIoNew(
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tr_session* session,
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tr_bandwidth* parent,
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tr_address const* addr,
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tr_port port,
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time_t current_time,
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tr_sha1_digest_t const* torrent_hash,
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bool is_incoming,
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bool is_seed,
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struct tr_peer_socket const socket)
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{
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TR_ASSERT(session != nullptr);
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TR_ASSERT(session->events != nullptr);
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auto lock = session->unique_lock();
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|
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#ifdef WITH_UTP
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TR_ASSERT(socket.type == TR_PEER_SOCKET_TYPE_TCP || socket.type == TR_PEER_SOCKET_TYPE_UTP);
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#else
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TR_ASSERT(socket.type == TR_PEER_SOCKET_TYPE_TCP);
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#endif
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TR_ASSERT(session->allowsTCP() || socket.type != TR_PEER_SOCKET_TYPE_TCP);
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if (socket.type == TR_PEER_SOCKET_TYPE_TCP)
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{
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session->setSocketTOS(socket.handle.tcp, addr->type);
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maybeSetCongestionAlgorithm(socket.handle.tcp, session->peerCongestionAlgorithm());
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}
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auto* io = new tr_peerIo{ session, torrent_hash, is_incoming, *addr, port, is_seed, current_time, parent };
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io->socket = socket;
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io->bandwidth().setPeer(io);
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tr_logAddTraceIo(io, fmt::format("bandwidth is {}; its parent is {}", fmt::ptr(&io->bandwidth()), fmt::ptr(parent)));
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|
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switch (socket.type)
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|
{
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
tr_logAddTraceIo(io, fmt::format("socket (tcp) is {}", socket.handle.tcp));
|
|
io->event_read = event_new(session->eventBase(), socket.handle.tcp, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new(session->eventBase(), socket.handle.tcp, EV_WRITE, event_write_cb, io);
|
|
break;
|
|
|
|
#ifdef WITH_UTP
|
|
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
tr_logAddTraceIo(io, fmt::format("socket (utp) is {}", fmt::ptr(socket.handle.utp)));
|
|
utp_set_userdata(socket.handle.utp, io);
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
TR_ASSERT_MSG(false, fmt::format("unsupported peer socket type {:d}", socket.type));
|
|
}
|
|
|
|
return io;
|
|
}
|
|
|
|
void tr_peerIoUtpInit([[maybe_unused]] struct_utp_context* ctx)
|
|
{
|
|
#ifdef WITH_UTP
|
|
|
|
utp_set_callback(ctx, UTP_ON_READ, &utp_callback);
|
|
utp_set_callback(ctx, UTP_GET_READ_BUFFER_SIZE, &utp_callback);
|
|
utp_set_callback(ctx, UTP_ON_STATE_CHANGE, &utp_callback);
|
|
utp_set_callback(ctx, UTP_ON_ERROR, &utp_callback);
|
|
utp_set_callback(ctx, UTP_ON_OVERHEAD_STATISTICS, &utp_callback);
|
|
|
|
utp_context_set_option(ctx, UTP_RCVBUF, UtpReadBufferSize);
|
|
|
|
#endif
|
|
}
|
|
|
|
tr_peerIo* tr_peerIoNewIncoming(
|
|
tr_session* session,
|
|
tr_bandwidth* parent,
|
|
tr_address const* addr,
|
|
tr_port port,
|
|
time_t current_time,
|
|
struct tr_peer_socket const socket)
|
|
{
|
|
TR_ASSERT(session != nullptr);
|
|
TR_ASSERT(tr_address_is_valid(addr));
|
|
|
|
return tr_peerIoNew(session, parent, addr, port, current_time, nullptr, true, false, socket);
|
|
}
|
|
|
|
tr_peerIo* tr_peerIoNewOutgoing(
|
|
tr_session* session,
|
|
tr_bandwidth* parent,
|
|
tr_address const* addr,
|
|
tr_port port,
|
|
time_t current_time,
|
|
tr_sha1_digest_t const& torrent_hash,
|
|
bool is_seed,
|
|
bool utp)
|
|
{
|
|
TR_ASSERT(session != nullptr);
|
|
TR_ASSERT(tr_address_is_valid(addr));
|
|
TR_ASSERT(utp || session->allowsTCP());
|
|
|
|
auto socket = tr_peer_socket{};
|
|
|
|
if (utp)
|
|
{
|
|
socket = tr_netOpenPeerUTPSocket(session, addr, port, is_seed);
|
|
}
|
|
|
|
if (socket.type == TR_PEER_SOCKET_TYPE_NONE)
|
|
{
|
|
socket = tr_netOpenPeerSocket(session, addr, port, is_seed);
|
|
tr_logAddDebug(fmt::format(
|
|
"tr_netOpenPeerSocket returned {}",
|
|
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, current_time, &torrent_hash, false, is_seed, 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)
|
|
{
|
|
tr_logAddTraceIo(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)
|
|
{
|
|
tr_logAddTraceIo(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)
|
|
{
|
|
tr_logAddTraceIo(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)
|
|
{
|
|
tr_logAddTraceIo(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_set_userdata(io->socket.handle.utp, nullptr);
|
|
utp_close(io->socket.handle.utp);
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
tr_logAddDebugIo(io, fmt::format("unsupported peer socket type {}", 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(tr_peerIo* const io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(tr_amInEventThread(io->session));
|
|
TR_ASSERT(io->session->events != nullptr);
|
|
|
|
tr_logAddTraceIo(io, "in tr_peerIo destructor");
|
|
event_disable(io, EV_READ | EV_WRITE);
|
|
io_close_socket(io);
|
|
|
|
io->magic_number = ~0;
|
|
delete io;
|
|
}
|
|
|
|
static void tr_peerIoFree(tr_peerIo* io)
|
|
{
|
|
if (io != nullptr)
|
|
{
|
|
tr_logAddTraceIo(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));
|
|
|
|
tr_logAddTraceIo(
|
|
io,
|
|
fmt::format("{}:{} incrementing the IO's refcount from {} to {}", 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));
|
|
|
|
tr_logAddTraceIo(
|
|
io,
|
|
fmt::format("{}:{} decrementing the IO's refcount from {} to {}", file, line, io->refCount, io->refCount - 1));
|
|
|
|
if (--io->refCount == 0)
|
|
{
|
|
tr_peerIoFree(io);
|
|
}
|
|
}
|
|
|
|
std::string tr_peerIo::addrStr() const
|
|
{
|
|
return tr_isPeerIo(this) ? this->addr_.readable(this->port_) : "error";
|
|
}
|
|
|
|
void tr_peerIoSetIOFuncs(tr_peerIo* io, tr_can_read_cb readcb, tr_did_write_cb writecb, tr_net_error_cb errcb, void* user_data)
|
|
{
|
|
io->canRead = readcb;
|
|
io->didWrite = writecb;
|
|
io->gotError = errcb;
|
|
io->userData = user_data;
|
|
}
|
|
|
|
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);
|
|
io_close_socket(io);
|
|
}
|
|
|
|
int tr_peerIoReconnect(tr_peerIo* io)
|
|
{
|
|
TR_ASSERT(tr_isPeerIo(io));
|
|
TR_ASSERT(!io->isIncoming());
|
|
TR_ASSERT(io->session->allowsTCP());
|
|
|
|
tr_session* session = tr_peerIoGetSession(io);
|
|
|
|
short int const pendingEvents = io->pendingEvents;
|
|
event_disable(io, EV_READ | EV_WRITE);
|
|
|
|
io_close_socket(io);
|
|
|
|
auto const [addr, port] = io->socketAddress();
|
|
io->socket = tr_netOpenPeerSocket(session, &addr, port, io->isSeed());
|
|
|
|
if (io->socket.type != TR_PEER_SOCKET_TYPE_TCP)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
io->event_read = event_new(session->eventBase(), io->socket.handle.tcp, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new(session->eventBase(), io->socket.handle.tcp, EV_WRITE, event_write_cb, io);
|
|
|
|
event_enable(io, pendingEvents);
|
|
io->session->setSocketTOS(io->socket.handle.tcp, addr.type);
|
|
maybeSetCongestionAlgorithm(io->socket.handle.tcp, session->peerCongestionAlgorithm());
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
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)(tr_block_info::BlockSize * 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.get());
|
|
size_t freeSpace = 0;
|
|
|
|
if (desiredLen > currentLen)
|
|
{
|
|
freeSpace = desiredLen - currentLen;
|
|
}
|
|
|
|
return freeSpace;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static inline void processBuffer(tr_peerIo& io, evbuffer* buffer, size_t offset, size_t size)
|
|
{
|
|
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;
|
|
}
|
|
|
|
io.encrypt(iovec.iov_len, 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);
|
|
}
|
|
|
|
void tr_peerIoWriteBuf(tr_peerIo* io, struct evbuffer* buf, bool isPieceData)
|
|
{
|
|
size_t const byteCount = evbuffer_get_length(buf);
|
|
|
|
if (io->isEncrypted())
|
|
{
|
|
processBuffer(*io, buf, 0, byteCount);
|
|
}
|
|
|
|
evbuffer_add_buffer(io->outbuf.get(), buf);
|
|
io->outbuf_info.emplace_back(byteCount, isPieceData);
|
|
}
|
|
|
|
void tr_peerIoWriteBytes(tr_peerIo* io, void const* writeme, size_t writeme_len, bool is_piece_data)
|
|
{
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_reserve_space(io->outbuf.get(), writeme_len, &iovec, 1);
|
|
|
|
iovec.iov_len = writeme_len;
|
|
|
|
memcpy(iovec.iov_base, writeme, iovec.iov_len);
|
|
|
|
if (io->isEncrypted())
|
|
{
|
|
io->encrypt(iovec.iov_len, iovec.iov_base);
|
|
}
|
|
|
|
evbuffer_commit_space(io->outbuf.get(), &iovec, 1);
|
|
|
|
io->outbuf_info.emplace_back(writeme_len, is_piece_data);
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
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));
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
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);
|
|
|
|
evbuffer_remove(inbuf, bytes, byteCount);
|
|
|
|
if (io->isEncrypted())
|
|
{
|
|
io->decrypt(byteCount, bytes);
|
|
}
|
|
}
|
|
|
|
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 byte_count)
|
|
{
|
|
auto buf = std::array<char, 4096>{};
|
|
|
|
while (byte_count > 0)
|
|
{
|
|
size_t const this_pass = std::min(byte_count, std::size(buf));
|
|
tr_peerIoReadBytes(io, inbuf, std::data(buf), this_pass);
|
|
byte_count -= this_pass;
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int tr_peerIoTryRead(tr_peerIo* io, size_t howmuch)
|
|
{
|
|
howmuch = io->bandwidth().clamp(TR_DOWN, howmuch);
|
|
if (howmuch == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
auto res = int{};
|
|
switch (io->socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
/* UTP_RBDrained notifies libutp that your read buffer is empty.
|
|
* 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.get()) == 0)
|
|
{
|
|
utp_read_drained(io->socket.handle.utp);
|
|
}
|
|
|
|
break;
|
|
|
|
case TR_PEER_SOCKET_TYPE_TCP:
|
|
{
|
|
EVUTIL_SET_SOCKET_ERROR(0);
|
|
res = evbuffer_read(io->inbuf.get(), io->socket.handle.tcp, (int)howmuch);
|
|
int const e = EVUTIL_SOCKET_ERROR();
|
|
|
|
tr_logAddTraceIo(io, fmt::format("read {} from peer ({})", res, res == -1 ? tr_net_strerror(e).c_str() : ""));
|
|
|
|
if (evbuffer_get_length(io->inbuf.get()) != 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;
|
|
}
|
|
|
|
tr_logAddTraceIo(
|
|
io,
|
|
fmt::format("tr_peerIoTryRead err: res:{} what:{}, errno:{} ({})", res, what, e, tr_net_strerror(e)));
|
|
|
|
io->gotError(io, what, io->userData);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
tr_logAddDebugIo(io, fmt::format("unsupported peer socket type {}", 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.get()) };
|
|
|
|
tr_logAddTraceIo(io, fmt::format("in tr_peerIoTryWrite {}", howmuch));
|
|
howmuch = std::min(howmuch, old_len);
|
|
howmuch = io->bandwidth().clamp(TR_UP, howmuch);
|
|
if (howmuch == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
auto n = int{};
|
|
switch (io->socket.type)
|
|
{
|
|
case TR_PEER_SOCKET_TYPE_UTP:
|
|
n = utp_write(io->socket.handle.utp, evbuffer_pullup(io->outbuf.get(), howmuch), howmuch);
|
|
|
|
if (n > 0)
|
|
{
|
|
evbuffer_drain(io->outbuf.get(), n);
|
|
didWriteWrapper(io, n);
|
|
}
|
|
|
|
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)
|
|
{
|
|
short const what = BEV_EVENT_WRITING | BEV_EVENT_ERROR;
|
|
|
|
tr_logAddTraceIo(
|
|
io,
|
|
fmt::format("tr_peerIoTryWrite err: res:{}, what:{}, errno:{} ({})", n, what, e, tr_net_strerror(e)));
|
|
io->gotError(io, what, io->userData);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
tr_logAddDebugIo(io, fmt::format("unsupported peer socket type {}", 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 const bytes_used = dir == TR_DOWN ? tr_peerIoTryRead(io, limit) : tr_peerIoTryWrite(io, limit);
|
|
tr_logAddTraceIo(io, fmt::format("flushing peer-io, direction:{}, limit:{}, byte_used:{}", dir, limit, bytes_used));
|
|
return bytes_used;
|
|
}
|
|
|
|
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 (auto const& [n_bytes, is_piece_data] : io->outbuf_info)
|
|
{
|
|
if (is_piece_data)
|
|
{
|
|
break;
|
|
}
|
|
|
|
byteCount += n_bytes;
|
|
}
|
|
|
|
return tr_peerIoFlush(io, TR_UP, byteCount);
|
|
}
|