transmission/libtransmission/peer-socket.cc

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// This file Copyright © 2017-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <fmt/format.h>
#include <libutp/utp.h>
#include "transmission.h"
#include "peer-socket.h"
#include "net.h"
#include "session.h"
#define tr_logAddErrorIo(io, msg) tr_logAddError(msg, (io)->display_name())
#define tr_logAddWarnIo(io, msg) tr_logAddWarn(msg, (io)->display_name())
#define tr_logAddDebugIo(io, msg) tr_logAddDebug(msg, (io)->display_name())
#define tr_logAddTraceIo(io, msg) tr_logAddTrace(msg, (io)->display_name())
tr_peer_socket::tr_peer_socket(tr_session* session, tr_address const& address, tr_port port, tr_socket_t sock)
: handle{ sock }
, address_{ address }
, port_{ port }
, type_{ Type::TCP }
{
TR_ASSERT(sock != TR_BAD_SOCKET);
session->setSocketTOS(sock, address_.type);
if (auto const& algo = session->peerCongestionAlgorithm(); !std::empty(algo))
{
tr_netSetCongestionControl(sock, algo.c_str());
}
tr_logAddTraceIo(this, fmt::format("socket (tcp) is {}", handle.tcp));
}
tr_peer_socket::tr_peer_socket(tr_address const& address, tr_port port, struct UTPSocket* const sock)
: address_{ address }
, port_{ port }
, type_{ Type::UTP }
{
TR_ASSERT(sock != nullptr);
handle.utp = sock;
tr_logAddTraceIo(this, fmt::format("socket (µTP) is {}", fmt::ptr(handle.utp)));
}
void tr_peer_socket::close(tr_session* session)
{
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if (is_tcp() && (handle.tcp != TR_BAD_SOCKET))
{
tr_netClose(session, handle.tcp);
}
#ifdef WITH_UTP
else if (is_utp())
{
utp_set_userdata(handle.utp, nullptr);
utp_close(handle.utp);
}
#endif
type_ = Type::None;
handle = {};
}
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size_t tr_peer_socket::try_write(Buffer& buf, size_t max, tr_error** error) const
{
if (max == size_t{})
{
return {};
}
if (is_tcp())
{
return buf.toSocket(handle.tcp, max, error);
}
#ifdef WITH_UTP
if (is_utp())
{
auto iov = buf.vecs(max);
errno = 0;
auto const n = utp_writev(handle.utp, reinterpret_cast<struct utp_iovec*>(std::data(iov)), std::size(iov));
auto const error_code = errno;
if (n > 0)
{
buf.drain(n);
return static_cast<size_t>(n);
}
if (n < 0 && error_code != 0)
{
tr_error_set(error, error_code, tr_strerror(error_code));
}
}
#endif
return {};
}
size_t tr_peer_socket::try_read(Buffer& buf, size_t max, tr_error** error) const
{
if (max == size_t{})
{
return {};
}
if (is_tcp())
{
return buf.addSocket(handle.tcp, max, error);
}
#ifdef WITH_UTP
if (is_utp())
{
// utp_read_drained() notifies libutp that this read buffer is
// empty. It opens up the congestion window by sending an ACK
// (soonish) if one was not going to be sent.
if (std::empty(buf))
{
utp_read_drained(handle.utp);
}
}
#endif
return {};
}
tr_peer_socket tr_netOpenPeerUTPSocket(
tr_session* session,
tr_address const& addr,
tr_port port,
bool /*client_is_seed*/,
void* userdata)
{
auto ret = tr_peer_socket{};
if (session->utp_context != nullptr && addr.is_valid_for_peers(port))
{
auto const [ss, sslen] = addr.to_sockaddr(port);
if (auto* const sock = utp_create_socket(session->utp_context); sock != nullptr)
{
utp_set_userdata(sock, userdata);
if (utp_connect(sock, reinterpret_cast<sockaddr const*>(&ss), sslen) != -1)
{
ret = tr_peer_socket{ addr, port, sock };
}
else
{
utp_close(sock);
}
}
}
return ret;
}