1341 lines
34 KiB
C
1341 lines
34 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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* $Id$
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*/
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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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 "trevent.h" /* tr_runInEventThread () */
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#include "tr-utp.h"
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#include "utils.h"
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#ifdef _WIN32
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#define EAGAIN WSAEWOULDBLOCK
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#define EINTR WSAEINTR
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#define EINPROGRESS WSAEINPROGRESS
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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
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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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const double 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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tr_logAddDeep (__FILE__, __LINE__, tr_peerIoGetAddrStr (io), __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 = NULL;
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static const struct tr_datatype TR_DATATYPE_INIT = { NULL, 0, false };
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static struct tr_datatype *
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datatype_new (void)
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{
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struct tr_datatype * ret;
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if (datatype_pool == NULL)
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ret = tr_new (struct tr_datatype, 1);
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else {
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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 = TR_DATATYPE_INIT;
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return ret;
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}
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static void
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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
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peer_io_pull_datatype (tr_peerIo * io)
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{
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struct tr_datatype * tmp;
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if ((tmp = io->outbuf_datatypes))
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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
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peer_io_push_datatype (tr_peerIo * io, struct tr_datatype * datatype)
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{
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struct tr_datatype * tmp;
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if ((tmp = io->outbuf_datatypes)) {
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while (tmp->next != NULL)
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tmp = tmp->next;
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tmp->next = datatype;
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} else {
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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
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didWriteWrapper (tr_peerIo * io, unsigned int bytes_transferred)
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{
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while (bytes_transferred && tr_isPeerIo (io))
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{
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struct tr_datatype * next = io->outbuf_datatypes;
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const unsigned int payload = MIN (next->length, bytes_transferred);
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/* For uTP sockets, the overhead is computed in utp_on_overhead. */
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const unsigned int overhead =
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io->socket ? guessPacketOverhead (payload) : 0;
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const uint64_t now = tr_time_msec ();
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tr_bandwidthUsed (&io->bandwidth, TR_UP, payload, next->isPieceData, now);
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if (overhead > 0)
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tr_bandwidthUsed (&io->bandwidth, TR_UP, overhead, false, now);
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if (io->didWrite)
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io->didWrite (io, payload, next->isPieceData, io->userData);
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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)
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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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static void
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canReadWrapper (tr_peerIo * io)
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{
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bool err = false;
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bool done = false;
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tr_session * session;
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dbgmsg (io, "canRead");
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tr_peerIoRef (io);
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session = io->session;
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/* try to consume the input buffer */
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if (io->canRead)
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{
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const uint64_t now = tr_time_msec ();
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tr_sessionLock (session);
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while (!done && !err)
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{
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size_t piece = 0;
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const size_t oldLen = evbuffer_get_length (io->inbuf);
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const int ret = io->canRead (io, io->userData, &piece);
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const size_t used = oldLen - evbuffer_get_length (io->inbuf);
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const unsigned int overhead = guessPacketOverhead (used);
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if (piece || (piece!=used))
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{
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if (piece)
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tr_bandwidthUsed (&io->bandwidth, TR_DOWN, piece, true, now);
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if (used != piece)
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tr_bandwidthUsed (&io->bandwidth, TR_DOWN, used - piece, false, now);
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}
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if (overhead > 0)
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tr_bandwidthUsed (&io->bandwidth, TR_UP, overhead, false, now);
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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))
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continue;
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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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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
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event_read_cb (evutil_socket_t fd, short event UNUSED, void * vio)
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{
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int res;
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int e;
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tr_peerIo * io = vio;
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/* Limit the input buffer to 256K, so it doesn't grow too large */
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unsigned int howmuch;
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unsigned int curlen;
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const tr_direction dir = TR_DOWN;
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const unsigned int max = 256 * 1024;
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assert (tr_isPeerIo (io));
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assert (io->socket >= 0);
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io->pendingEvents &= ~EV_READ;
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curlen = evbuffer_get_length (io->inbuf);
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howmuch = curlen >= max ? 0 : max - curlen;
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howmuch = tr_bandwidthClamp (&io->bandwidth, 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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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 = evbuffer_read (io->inbuf, fd, (int)howmuch);
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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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char errstr[512];
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short what = BEV_EVENT_READING;
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if (res == 0) /* EOF */
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what |= BEV_EVENT_EOF;
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else if (res == -1) {
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if (e == EAGAIN || e == EINTR) {
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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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dbgmsg (io, "event_read_cb got an error. res is %d, what is %hd, errno is %d (%s)",
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res, what, e, tr_net_strerror (errstr, sizeof (errstr), e));
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if (io->gotError != NULL)
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io->gotError (io, what, io->userData);
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}
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}
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static int
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tr_evbuffer_write (tr_peerIo * io, int fd, size_t howmuch)
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{
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int e;
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int n;
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char errstr[256];
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EVUTIL_SET_SOCKET_ERROR (0);
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n = evbuffer_write_atmost (io->outbuf, fd, howmuch);
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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
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event_write_cb (evutil_socket_t fd, short event UNUSED, void * vio)
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{
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int res = 0;
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int e;
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short what = BEV_EVENT_WRITING;
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tr_peerIo * io = vio;
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size_t howmuch;
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const tr_direction dir = TR_UP;
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char errstr[1024];
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assert (tr_isPeerIo (io));
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assert (io->socket >= 0);
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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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howmuch = tr_bandwidthClamp (&io->bandwidth, 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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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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e = EVUTIL_SOCKET_ERROR ();
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if (res == -1) {
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if (!e || e == EAGAIN || e == EINTR || e == EINPROGRESS)
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goto reschedule;
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/* error case */
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what |= BEV_EVENT_ERROR;
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} else if (res == 0) {
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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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goto error;
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if (evbuffer_get_length (io->outbuf))
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tr_peerIoSetEnabled (io, dir, true);
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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))
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tr_peerIoSetEnabled (io, dir, true);
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return;
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error:
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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 != NULL)
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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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static void
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maybeSetCongestionAlgorithm (int socket, const char * algorithm)
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{
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if (algorithm && *algorithm)
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{
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const int rc = tr_netSetCongestionControl (socket, algorithm);
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if (rc < 0)
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tr_logAddNamedInfo ("Net", "Can't set congestion control algorithm '%s': %s",
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algorithm, tr_strerror (errno));
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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
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utp_on_read (void *closure, const unsigned char *buf, size_t buflen)
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{
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int rc;
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tr_peerIo *io = closure;
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assert (tr_isPeerIo (io));
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rc = evbuffer_add (io->inbuf, buf, buflen);
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dbgmsg (io, "utp_on_read got %"TR_PRIuSIZE" bytes", buflen);
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if (rc < 0) {
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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
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utp_on_write (void *closure, unsigned char *buf, size_t buflen)
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{
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int rc;
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tr_peerIo *io = closure;
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assert (tr_isPeerIo (io));
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rc = evbuffer_remove (io->outbuf, buf, buflen);
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dbgmsg (io, "utp_on_write sending %"TR_PRIuSIZE" bytes... evbuffer_remove returned %d", buflen, rc);
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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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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
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utp_get_rb_size (void *closure)
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{
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size_t bytes;
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tr_peerIo *io = closure;
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assert (tr_isPeerIo (io));
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bytes = tr_bandwidthClamp (&io->bandwidth, TR_DOWN, UTP_READ_BUFFER_SIZE);
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dbgmsg (io, "utp_get_rb_size is saying it's ready to read %"TR_PRIuSIZE" 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
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utp_on_writable (tr_peerIo *io)
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{
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int n;
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dbgmsg (io, "libutp says this peer is ready to write");
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n = tr_peerIoTryWrite (io, SIZE_MAX);
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tr_peerIoSetEnabled (io, TR_UP, n && evbuffer_get_length (io->outbuf));
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}
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static void
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utp_on_state_change (void *closure, int state)
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{
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tr_peerIo *io = closure;
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assert (tr_isPeerIo (io));
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|
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if (state == UTP_STATE_CONNECT) {
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dbgmsg (io, "utp_on_state_change -- changed to connected");
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io->utpSupported = true;
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} else if (state == UTP_STATE_WRITABLE) {
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dbgmsg (io, "utp_on_state_change -- changed to writable");
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if (io->pendingEvents & EV_WRITE)
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utp_on_writable (io);
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} else if (state == UTP_STATE_EOF) {
|
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if (io->gotError)
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io->gotError (io, BEV_EVENT_EOF, io->userData);
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} else if (state == UTP_STATE_DESTROYING) {
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tr_logAddNamedError ("UTP", "Impossible state UTP_STATE_DESTROYING");
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return;
|
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} else {
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tr_logAddNamedError ("UTP", "Unknown state %d", state);
|
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}
|
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}
|
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|
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static void
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utp_on_error (void *closure, int errcode)
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{
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tr_peerIo *io = closure;
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assert (tr_isPeerIo (io));
|
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|
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dbgmsg (io, "utp_on_error -- errcode is %d", errcode);
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|
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if (io->gotError) {
|
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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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|
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static void
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utp_on_overhead (void *closure, uint8_t send, size_t count, int type UNUSED)
|
|
{
|
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tr_peerIo *io = closure;
|
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assert (tr_isPeerIo (io));
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|
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dbgmsg (io, "utp_on_overhead -- count is %"TR_PRIuSIZE, count);
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|
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tr_bandwidthUsed (&io->bandwidth, send ? TR_UP : TR_DOWN,
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count, false, tr_time_msec ());
|
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}
|
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|
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static struct UTPFunctionTable utp_function_table = {
|
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.on_read = utp_on_read,
|
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.on_write = utp_on_write,
|
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.get_rb_size = utp_get_rb_size,
|
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.on_state = utp_on_state_change,
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.on_error = utp_on_error,
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.on_overhead = utp_on_overhead
|
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};
|
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|
|
|
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/* Dummy UTP callbacks. */
|
|
/* We switch a UTP socket to use these after the associated peerIo has been
|
|
destroyed -- see io_dtor. */
|
|
|
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static void
|
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dummy_read (void * closure UNUSED, const unsigned char *buf UNUSED, size_t buflen UNUSED)
|
|
{
|
|
/* This cannot happen, as far as I'm aware. */
|
|
tr_logAddNamedError ("UTP", "On_read called on closed socket");
|
|
|
|
}
|
|
|
|
static void
|
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dummy_write (void * closure UNUSED, 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 UNUSED)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
dummy_on_state_change (void * closure UNUSED, int state UNUSED)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
dummy_on_error (void * closure UNUSED, int errcode UNUSED)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
dummy_on_overhead (void *closure UNUSED, uint8_t send UNUSED, size_t count UNUSED, int type UNUSED)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static struct UTPFunctionTable dummy_utp_function_table = {
|
|
.on_read = dummy_read,
|
|
.on_write = dummy_write,
|
|
.get_rb_size = dummy_get_rb_size,
|
|
.on_state = dummy_on_state_change,
|
|
.on_error = dummy_on_error,
|
|
.on_overhead = dummy_on_overhead
|
|
};
|
|
|
|
#endif /* #ifdef WITH_UTP */
|
|
|
|
static tr_peerIo*
|
|
tr_peerIoNew (tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
const uint8_t * torrentHash,
|
|
bool isIncoming,
|
|
bool isSeed,
|
|
int socket,
|
|
struct UTPSocket * utp_socket)
|
|
{
|
|
tr_peerIo * io;
|
|
|
|
assert (session != NULL);
|
|
assert (session->events != NULL);
|
|
assert (tr_isBool (isIncoming));
|
|
assert (tr_isBool (isSeed));
|
|
assert (tr_amInEventThread (session));
|
|
assert ((socket < 0) == (utp_socket != NULL));
|
|
#ifndef WITH_UTP
|
|
assert (socket >= 0);
|
|
#endif
|
|
|
|
if (socket >= 0) {
|
|
tr_netSetTOS (socket, session->peerSocketTOS);
|
|
maybeSetCongestionAlgorithm (socket, session->peer_congestion_algorithm);
|
|
}
|
|
|
|
io = tr_new0 (tr_peerIo, 1);
|
|
io->magicNumber = PEER_IO_MAGIC_NUMBER;
|
|
io->refCount = 1;
|
|
tr_cryptoConstruct (&io->crypto, torrentHash, isIncoming);
|
|
io->session = session;
|
|
io->addr = *addr;
|
|
io->isSeed = isSeed;
|
|
io->port = port;
|
|
io->socket = socket;
|
|
io->utp_socket = utp_socket;
|
|
io->isIncoming = isIncoming;
|
|
io->timeCreated = tr_time ();
|
|
io->inbuf = evbuffer_new ();
|
|
io->outbuf = evbuffer_new ();
|
|
tr_bandwidthConstruct (&io->bandwidth, session, parent);
|
|
tr_bandwidthSetPeer (&io->bandwidth, io);
|
|
dbgmsg (io, "bandwidth is %p; its parent is %p", (void*)&io->bandwidth, (void*)parent);
|
|
dbgmsg (io, "socket is %d, utp_socket is %p", socket, (void*)utp_socket);
|
|
|
|
if (io->socket >= 0) {
|
|
io->event_read = event_new (session->event_base,
|
|
io->socket, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new (session->event_base,
|
|
io->socket, EV_WRITE, event_write_cb, io);
|
|
}
|
|
#ifdef WITH_UTP
|
|
else {
|
|
UTP_SetSockopt (utp_socket, SO_RCVBUF, UTP_READ_BUFFER_SIZE);
|
|
dbgmsg (io, "%s", "calling UTP_SetCallbacks &utp_function_table");
|
|
UTP_SetCallbacks (utp_socket,
|
|
&utp_function_table,
|
|
io);
|
|
if (!isIncoming) {
|
|
dbgmsg (io, "%s", "calling UTP_Connect");
|
|
UTP_Connect (utp_socket);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return io;
|
|
}
|
|
|
|
tr_peerIo*
|
|
tr_peerIoNewIncoming (tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
int fd,
|
|
struct UTPSocket * utp_socket)
|
|
{
|
|
assert (session);
|
|
assert (tr_address_is_valid (addr));
|
|
|
|
return tr_peerIoNew (session, parent, addr, port, NULL, true, false,
|
|
fd, utp_socket);
|
|
}
|
|
|
|
tr_peerIo*
|
|
tr_peerIoNewOutgoing (tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
const uint8_t * torrentHash,
|
|
bool isSeed,
|
|
bool utp)
|
|
{
|
|
int fd = -1;
|
|
struct UTPSocket * utp_socket = NULL;
|
|
|
|
assert (session);
|
|
assert (tr_address_is_valid (addr));
|
|
assert (torrentHash);
|
|
|
|
if (utp)
|
|
utp_socket = tr_netOpenPeerUTPSocket (session, addr, port, isSeed);
|
|
|
|
if (!utp_socket) {
|
|
fd = tr_netOpenPeerSocket (session, addr, port, isSeed);
|
|
dbgmsg (NULL, "tr_netOpenPeerSocket returned fd %d", fd);
|
|
}
|
|
|
|
if (fd < 0 && utp_socket == NULL)
|
|
return NULL;
|
|
|
|
return tr_peerIoNew (session, parent, addr, port,
|
|
torrentHash, false, isSeed, fd, utp_socket);
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static void
|
|
event_enable (tr_peerIo * io, short event)
|
|
{
|
|
assert (tr_amInEventThread (io->session));
|
|
assert (io->session != NULL);
|
|
assert (io->session->events != NULL);
|
|
|
|
if (io->socket >= 0)
|
|
{
|
|
assert (event_initialized (io->event_read));
|
|
assert (event_initialized (io->event_write));
|
|
}
|
|
|
|
if ((event & EV_READ) && ! (io->pendingEvents & EV_READ))
|
|
{
|
|
dbgmsg (io, "enabling ready-to-read polling");
|
|
if (io->socket >= 0)
|
|
event_add (io->event_read, NULL);
|
|
io->pendingEvents |= EV_READ;
|
|
}
|
|
|
|
if ((event & EV_WRITE) && ! (io->pendingEvents & EV_WRITE))
|
|
{
|
|
dbgmsg (io, "enabling ready-to-write polling");
|
|
if (io->socket >= 0)
|
|
event_add (io->event_write, NULL);
|
|
io->pendingEvents |= EV_WRITE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
event_disable (struct tr_peerIo * io, short event)
|
|
{
|
|
assert (tr_amInEventThread (io->session));
|
|
assert (io->session != NULL);
|
|
assert (io->session->events != NULL);
|
|
|
|
if (io->socket >= 0)
|
|
{
|
|
assert (event_initialized (io->event_read));
|
|
assert (event_initialized (io->event_write));
|
|
}
|
|
|
|
if ((event & EV_READ) && (io->pendingEvents & EV_READ))
|
|
{
|
|
dbgmsg (io, "disabling ready-to-read polling");
|
|
if (io->socket >= 0)
|
|
event_del (io->event_read);
|
|
io->pendingEvents &= ~EV_READ;
|
|
}
|
|
|
|
if ((event & EV_WRITE) && (io->pendingEvents & EV_WRITE))
|
|
{
|
|
dbgmsg (io, "disabling ready-to-write polling");
|
|
if (io->socket >= 0)
|
|
event_del (io->event_write);
|
|
io->pendingEvents &= ~EV_WRITE;
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetEnabled (tr_peerIo * io,
|
|
tr_direction dir,
|
|
bool isEnabled)
|
|
{
|
|
const short event = dir == TR_UP ? EV_WRITE : EV_READ;
|
|
|
|
assert (tr_isPeerIo (io));
|
|
assert (tr_isDirection (dir));
|
|
assert (tr_amInEventThread (io->session));
|
|
assert (io->session->events != NULL);
|
|
|
|
if (isEnabled)
|
|
event_enable (io, event);
|
|
else
|
|
event_disable (io, event);
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
static void
|
|
io_close_socket (tr_peerIo * io)
|
|
{
|
|
if (io->socket >= 0) {
|
|
tr_netClose (io->session, io->socket);
|
|
io->socket = -1;
|
|
}
|
|
|
|
if (io->event_read != NULL) {
|
|
event_free (io->event_read);
|
|
io->event_read = NULL;
|
|
}
|
|
|
|
if (io->event_write != NULL) {
|
|
event_free (io->event_write);
|
|
io->event_write = NULL;
|
|
}
|
|
|
|
#ifdef WITH_UTP
|
|
if (io->utp_socket) {
|
|
UTP_SetCallbacks (io->utp_socket,
|
|
&dummy_utp_function_table,
|
|
NULL);
|
|
UTP_Close (io->utp_socket);
|
|
|
|
io->utp_socket = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
io_dtor (void * vio)
|
|
{
|
|
tr_peerIo * io = vio;
|
|
|
|
assert (tr_isPeerIo (io));
|
|
assert (tr_amInEventThread (io->session));
|
|
assert (io->session->events != NULL);
|
|
|
|
dbgmsg (io, "in tr_peerIo destructor");
|
|
event_disable (io, EV_READ | EV_WRITE);
|
|
tr_bandwidthDestruct (&io->bandwidth);
|
|
evbuffer_free (io->outbuf);
|
|
evbuffer_free (io->inbuf);
|
|
io_close_socket (io);
|
|
tr_cryptoDestruct (&io->crypto);
|
|
|
|
while (io->outbuf_datatypes != NULL)
|
|
peer_io_pull_datatype (io);
|
|
|
|
memset (io, ~0, sizeof (tr_peerIo));
|
|
tr_free (io);
|
|
}
|
|
|
|
static void
|
|
tr_peerIoFree (tr_peerIo * io)
|
|
{
|
|
if (io)
|
|
{
|
|
dbgmsg (io, "in tr_peerIoFree");
|
|
io->canRead = NULL;
|
|
io->didWrite = NULL;
|
|
io->gotError = NULL;
|
|
tr_runInEventThread (io->session, io_dtor, io);
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoRefImpl (const char * file, int line, tr_peerIo * io)
|
|
{
|
|
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 (const char * file, int line, tr_peerIo * io)
|
|
{
|
|
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)
|
|
tr_peerIoFree (io);
|
|
}
|
|
|
|
const tr_address*
|
|
tr_peerIoGetAddress (const tr_peerIo * io, tr_port * port)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
|
|
if (port)
|
|
*port = io->port;
|
|
|
|
return &io->addr;
|
|
}
|
|
|
|
const char*
|
|
tr_peerIoAddrStr (const tr_address * addr, tr_port port)
|
|
{
|
|
static char buf[512];
|
|
tr_snprintf (buf, sizeof (buf), "[%s]:%u", tr_address_to_string (addr), ntohs (port));
|
|
return buf;
|
|
}
|
|
|
|
const char* tr_peerIoGetAddrStr (const tr_peerIo * io)
|
|
{
|
|
return tr_isPeerIo (io) ? tr_peerIoAddrStr (&io->addr, io->port) : "error";
|
|
}
|
|
|
|
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, NULL, NULL, NULL, NULL);
|
|
tr_peerIoSetEnabled (io, TR_UP, false);
|
|
tr_peerIoSetEnabled (io, TR_DOWN, false);
|
|
}
|
|
|
|
int
|
|
tr_peerIoReconnect (tr_peerIo * io)
|
|
{
|
|
short int pendingEvents;
|
|
tr_session * session;
|
|
|
|
assert (tr_isPeerIo (io));
|
|
assert (!tr_peerIoIsIncoming (io));
|
|
|
|
session = tr_peerIoGetSession (io);
|
|
|
|
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);
|
|
io->event_read = event_new (session->event_base, io->socket, EV_READ, event_read_cb, io);
|
|
io->event_write = event_new (session->event_base, io->socket, EV_WRITE, event_write_cb, io);
|
|
|
|
if (io->socket >= 0)
|
|
{
|
|
event_enable (io, pendingEvents);
|
|
tr_netSetTOS (io->socket, session->peerSocketTOS);
|
|
maybeSetCongestionAlgorithm (io->socket, session->peer_congestion_algorithm);
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetTorrentHash (tr_peerIo * io,
|
|
const uint8_t * hash)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
|
|
tr_cryptoSetTorrentHash (&io->crypto, hash);
|
|
}
|
|
|
|
const uint8_t*
|
|
tr_peerIoGetTorrentHash (tr_peerIo * io)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
|
|
return tr_cryptoGetTorrentHash (&io->crypto);
|
|
}
|
|
|
|
bool
|
|
tr_peerIoHasTorrentHash (const tr_peerIo * io)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
|
|
return tr_cryptoHasTorrentHash (&io->crypto);
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetPeersId (tr_peerIo * io, const uint8_t * peer_id)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
|
|
if ((io->peerIdIsSet = peer_id != NULL))
|
|
memcpy (io->peerId, peer_id, 20);
|
|
else
|
|
memset (io->peerId, 0, 20);
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static unsigned int
|
|
getDesiredOutputBufferSize (const tr_peerIo * 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 */
|
|
const unsigned int currentSpeed_Bps = tr_bandwidthGetPieceSpeed_Bps (&io->bandwidth, now, TR_UP);
|
|
const unsigned int period = 15u; /* arbitrary */
|
|
/* the 3 is arbitrary; the .5 is to leave room for messages */
|
|
static const unsigned int ceiling = (unsigned int)(MAX_BLOCK_SIZE * 3.5);
|
|
return MAX (ceiling, currentSpeed_Bps*period);
|
|
}
|
|
|
|
size_t
|
|
tr_peerIoGetWriteBufferSpace (const tr_peerIo * io, uint64_t now)
|
|
{
|
|
const size_t desiredLen = getDesiredOutputBufferSize (io, now);
|
|
const size_t 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)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
assert (encryption_type == PEER_ENCRYPTION_NONE
|
|
|| encryption_type == PEER_ENCRYPTION_RC4);
|
|
|
|
io->encryption_type = encryption_type;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static void
|
|
addDatatype (tr_peerIo * io, size_t byteCount, bool isPieceData)
|
|
{
|
|
struct tr_datatype * d;
|
|
d = datatype_new ();
|
|
d->isPieceData = isPieceData;
|
|
d->length = byteCount;
|
|
peer_io_push_datatype (io, d);
|
|
}
|
|
|
|
static void
|
|
maybeEncryptBuffer (tr_peerIo * io, struct evbuffer * buf)
|
|
{
|
|
if (io->encryption_type == PEER_ENCRYPTION_RC4)
|
|
{
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_ptr_set (buf, &pos, 0, EVBUFFER_PTR_SET);
|
|
do {
|
|
evbuffer_peek (buf, -1, &pos, &iovec, 1);
|
|
tr_cryptoEncrypt (&io->crypto, iovec.iov_len, iovec.iov_base, iovec.iov_base);
|
|
} while (!evbuffer_ptr_set (buf, &pos, iovec.iov_len, EVBUFFER_PTR_ADD));
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBuf (tr_peerIo * io, struct evbuffer * buf, bool isPieceData)
|
|
{
|
|
const size_t byteCount = evbuffer_get_length (buf);
|
|
maybeEncryptBuffer (io, buf);
|
|
evbuffer_add_buffer (io->outbuf, buf);
|
|
addDatatype (io, byteCount, isPieceData);
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBytes (tr_peerIo * io, const void * 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 byte)
|
|
{
|
|
evbuffer_add (outbuf, &byte, 1);
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint16 (struct evbuffer * outbuf, uint16_t addme_hs)
|
|
{
|
|
const uint16_t ns = htons (addme_hs);
|
|
evbuffer_add (outbuf, &ns, sizeof (ns));
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint32 (struct evbuffer * outbuf, uint32_t addme_hl)
|
|
{
|
|
const uint32_t nl = htonl (addme_hl);
|
|
evbuffer_add (outbuf, &nl, sizeof (nl));
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint64 (struct evbuffer * outbuf, uint64_t addme_hll)
|
|
{
|
|
const uint64_t nll = tr_htonll (addme_hll);
|
|
evbuffer_add (outbuf, &nll, sizeof (nll));
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
tr_peerIoReadBytesToBuf (tr_peerIo * io, struct evbuffer * inbuf, struct evbuffer * outbuf, size_t byteCount)
|
|
{
|
|
struct evbuffer * tmp;
|
|
const size_t old_length = evbuffer_get_length (outbuf);
|
|
|
|
assert (tr_isPeerIo (io));
|
|
assert (evbuffer_get_length (inbuf) >= byteCount);
|
|
|
|
/* append it to outbuf */
|
|
tmp = evbuffer_new ();
|
|
evbuffer_remove_buffer (inbuf, tmp, byteCount);
|
|
evbuffer_add_buffer (outbuf, tmp);
|
|
evbuffer_free (tmp);
|
|
|
|
/* decrypt if needed */
|
|
if (io->encryption_type == PEER_ENCRYPTION_RC4) {
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_ptr_set (outbuf, &pos, old_length, EVBUFFER_PTR_SET);
|
|
do {
|
|
evbuffer_peek (outbuf, byteCount, &pos, &iovec, 1);
|
|
tr_cryptoDecrypt (&io->crypto, iovec.iov_len, iovec.iov_base, iovec.iov_base);
|
|
byteCount -= iovec.iov_len;
|
|
} while (!evbuffer_ptr_set (outbuf, &pos, iovec.iov_len, EVBUFFER_PTR_ADD));
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoReadBytes (tr_peerIo * io, struct evbuffer * inbuf, void * bytes, size_t byteCount)
|
|
{
|
|
assert (tr_isPeerIo (io));
|
|
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:
|
|
assert (0);
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoReadUint16 (tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
uint16_t * setme)
|
|
{
|
|
uint16_t tmp;
|
|
tr_peerIoReadBytes (io, inbuf, &tmp, sizeof (uint16_t));
|
|
*setme = ntohs (tmp);
|
|
}
|
|
|
|
void tr_peerIoReadUint32 (tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
uint32_t * setme)
|
|
{
|
|
uint32_t tmp;
|
|
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];
|
|
const size_t buflen = sizeof (buf);
|
|
|
|
while (byteCount > 0)
|
|
{
|
|
const size_t thisPass = MIN (byteCount, buflen);
|
|
tr_peerIoReadBytes (io, inbuf, buf, thisPass);
|
|
byteCount -= thisPass;
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int
|
|
tr_peerIoTryRead (tr_peerIo * io, size_t howmuch)
|
|
{
|
|
int res = 0;
|
|
|
|
if ((howmuch = tr_bandwidthClamp (&io->bandwidth, TR_DOWN, howmuch)))
|
|
{
|
|
if (io->utp_socket != NULL) /* utp peer connection */
|
|
{
|
|
/* 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->utp_socket);
|
|
}
|
|
else /* tcp peer connection */
|
|
{
|
|
int e;
|
|
|
|
EVUTIL_SET_SOCKET_ERROR (0);
|
|
res = evbuffer_read (io->inbuf, io->socket, (int)howmuch);
|
|
e = EVUTIL_SOCKET_ERROR ();
|
|
|
|
dbgmsg (io, "read %d from peer (%s)", res, (res==-1?tr_strerror (e):""));
|
|
|
|
if (evbuffer_get_length (io->inbuf))
|
|
canReadWrapper (io);
|
|
|
|
if ((res <= 0) && (io->gotError) && (e != EAGAIN) && (e != EINTR) && (e != EINPROGRESS))
|
|
{
|
|
char errstr[512];
|
|
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 (errstr, sizeof (errstr), e));
|
|
io->gotError (io, what, io->userData);
|
|
}
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
tr_peerIoTryWrite (tr_peerIo * io, size_t howmuch)
|
|
{
|
|
int n = 0;
|
|
const size_t old_len = evbuffer_get_length (io->outbuf);
|
|
dbgmsg (io, "in tr_peerIoTryWrite %"TR_PRIuSIZE, howmuch);
|
|
|
|
if (howmuch > old_len)
|
|
howmuch = old_len;
|
|
|
|
if ((howmuch = tr_bandwidthClamp (&io->bandwidth, TR_UP, howmuch)))
|
|
{
|
|
if (io->utp_socket != NULL) /* utp peer connection */
|
|
{
|
|
UTP_Write (io->utp_socket, howmuch);
|
|
n = old_len - evbuffer_get_length (io->outbuf);
|
|
}
|
|
else
|
|
{
|
|
int e;
|
|
|
|
EVUTIL_SET_SOCKET_ERROR (0);
|
|
n = tr_evbuffer_write (io, io->socket, howmuch);
|
|
e = EVUTIL_SOCKET_ERROR ();
|
|
|
|
if (n > 0)
|
|
didWriteWrapper (io, n);
|
|
|
|
if ((n < 0) && (io->gotError) && e && (e != EPIPE) && (e != EAGAIN) && (e != EINTR) && (e != EINPROGRESS))
|
|
{
|
|
char errstr[512];
|
|
const short 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));
|
|
|
|
if (io->gotError != NULL)
|
|
io->gotError (io, what, io->userData);
|
|
}
|
|
}
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
int
|
|
tr_peerIoFlush (tr_peerIo * io, tr_direction dir, size_t limit)
|
|
{
|
|
int bytesUsed = 0;
|
|
|
|
assert (tr_isPeerIo (io));
|
|
assert (tr_isDirection (dir));
|
|
|
|
if (dir == TR_DOWN)
|
|
bytesUsed = tr_peerIoTryRead (io, limit);
|
|
else
|
|
bytesUsed = tr_peerIoTryWrite (io, limit);
|
|
|
|
dbgmsg (io, "flushing peer-io, direction %d, limit %"TR_PRIuSIZE", bytesUsed %d", (int)dir, limit, bytesUsed);
|
|
return bytesUsed;
|
|
}
|
|
|
|
int
|
|
tr_peerIoFlushOutgoingProtocolMsgs (tr_peerIo * io)
|
|
{
|
|
size_t byteCount = 0;
|
|
const struct tr_datatype * it;
|
|
|
|
/* count up how many bytes are used by non-piece-data messages
|
|
at the front of our outbound queue */
|
|
for (it=io->outbuf_datatypes; it!=NULL; it=it->next)
|
|
if (it->isPieceData)
|
|
break;
|
|
else
|
|
byteCount += it->length;
|
|
|
|
return tr_peerIoFlush (io, TR_UP, byteCount);
|
|
}
|