mirror of
https://github.com/transmission/transmission
synced 2024-12-23 00:04:06 +00:00
181 lines
4.5 KiB
C++
181 lines
4.5 KiB
C++
// This file Copyright © 2010 Juliusz Chroboczek.
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// It may be used under the MIT (SPDX: MIT) license.
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// License text can be found in the licenses/ folder.
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#include <event2/event.h>
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#include <cstdint>
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#include <libutp/utp.h>
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#include "transmission.h"
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#include "log.h"
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#include "net.h"
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#include "session.h"
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#include "crypto-utils.h" /* tr_rand_int_weak() */
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#include "peer-mgr.h"
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#include "peer-socket.h"
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#include "tr-utp.h"
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#include "utils.h"
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#ifndef WITH_UTP
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static char constexpr MyName[] = "UTP";
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#define dbgmsg(...) tr_logAddDeepNamed(MyName, __VA_ARGS__)
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void UTP_Close(struct UTPSocket* socket)
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{
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tr_logAddNamedError(MyName, "UTP_Close(%p) was called.", socket);
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dbgmsg("UTP_Close(%p) was called.", socket);
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}
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void UTP_RBDrained(struct UTPSocket* socket)
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{
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tr_logAddNamedError(MyName, "UTP_RBDrained(%p) was called.", socket);
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dbgmsg("UTP_RBDrained(%p) was called.", socket);
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}
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bool UTP_Write(struct UTPSocket* socket, size_t count)
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{
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tr_logAddNamedError(MyName, "UTP_RBDrained(%p, %zu) was called.", socket, count);
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dbgmsg("UTP_RBDrained(%p, %zu) was called.", socket, count);
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return false;
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}
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int tr_utpPacket(
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unsigned char const* /*buf*/,
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size_t /*buflen*/,
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sockaddr const* /*from*/,
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socklen_t /*fromlen*/,
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tr_session* /*ss*/)
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{
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return -1;
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}
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struct UTPSocket* UTP_Create(
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SendToProc* /*send_to_proc*/,
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void* /*send_to_userdata*/,
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sockaddr const* /*addr*/,
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socklen_t /*addrlen*/)
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{
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errno = ENOSYS;
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return nullptr;
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}
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void tr_utpClose(tr_session* /*ss*/)
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{
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}
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void tr_utpSendTo(
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void* /*closure*/,
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unsigned char const* /*buf*/,
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size_t /*buflen*/,
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struct sockaddr const* /*to*/,
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socklen_t /*tolen*/)
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{
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}
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#else
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/* Greg says 50ms works for them. */
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static auto constexpr UtpIntervalUs = int{ 50000 };
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static void incoming(void* vsession, struct UTPSocket* s)
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{
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auto* session = static_cast<tr_session*>(vsession);
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struct sockaddr_storage from_storage;
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auto* const from = (struct sockaddr*)&from_storage;
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socklen_t fromlen = sizeof(from_storage);
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tr_address addr;
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tr_port port = 0;
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if (!tr_sessionIsUTPEnabled(session))
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{
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UTP_Close(s);
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return;
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}
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UTP_GetPeerName(s, from, &fromlen);
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if (!tr_address_from_sockaddr_storage(&addr, &port, &from_storage))
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{
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tr_logAddNamedError("UTP", "Unknown socket family");
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UTP_Close(s);
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return;
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}
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tr_peerMgrAddIncoming(session->peerMgr, &addr, port, tr_peer_socket_utp_create(s));
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}
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void tr_utpSendTo(void* closure, unsigned char const* buf, size_t buflen, struct sockaddr const* to, socklen_t tolen)
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{
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auto const* const ss = static_cast<tr_session const*>(closure);
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if (to->sa_family == AF_INET && ss->udp_socket != TR_BAD_SOCKET)
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{
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(void)sendto(ss->udp_socket, reinterpret_cast<char const*>(buf), buflen, 0, to, tolen);
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}
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else if (to->sa_family == AF_INET6 && ss->udp6_socket != TR_BAD_SOCKET)
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{
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(void)sendto(ss->udp6_socket, reinterpret_cast<char const*>(buf), buflen, 0, to, tolen);
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}
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}
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static void reset_timer(tr_session* ss)
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{
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int sec = 0;
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int usec = 0;
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if (tr_sessionIsUTPEnabled(ss))
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{
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sec = 0;
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usec = UtpIntervalUs / 2 + tr_rand_int_weak(UtpIntervalUs);
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}
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else
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{
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/* If somebody has disabled uTP, then we still want to run
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UTP_CheckTimeouts, in order to let closed sockets finish
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gracefully and so on. However, since we're not particularly
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interested in that happening in a timely manner, we might as
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well use a large timeout. */
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sec = 2;
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usec = tr_rand_int_weak(1000000);
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}
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tr_timerAdd(ss->utp_timer, sec, usec);
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}
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static void timer_callback(evutil_socket_t /*s*/, short /*type*/, void* vsession)
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{
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auto* session = static_cast<tr_session*>(vsession);
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UTP_CheckTimeouts();
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reset_timer(session);
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}
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int tr_utpPacket(unsigned char const* buf, size_t buflen, struct sockaddr const* from, socklen_t fromlen, tr_session* ss)
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{
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if (!ss->isClosed && ss->utp_timer == nullptr)
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{
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ss->utp_timer = evtimer_new(ss->event_base, timer_callback, ss);
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if (ss->utp_timer == nullptr)
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{
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return -1;
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}
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reset_timer(ss);
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}
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return UTP_IsIncomingUTP(incoming, tr_utpSendTo, ss, buf, buflen, from, fromlen);
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}
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void tr_utpClose(tr_session* session)
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{
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if (session->utp_timer != nullptr)
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{
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evtimer_del(session->utp_timer);
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session->utp_timer = nullptr;
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}
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}
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#endif /* #ifndef WITH_UTP ... else */
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