mirror of
https://github.com/transmission/transmission
synced 2024-12-27 18:18:10 +00:00
51bc8d8b80
There's no need to test for DHT/uTP being enabled in tr-udp. The DHT will silently discard any packets directed at the wrong session (see the beginning of dhtCallback). As to uTP, we need to grok uTP packets to close any remaining connections after we disabled uTP, so it's better to participate in uTP, just reject any incoming connections.
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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Copyright (c) 2010 by Juliusz Chroboczek
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <unistd.h>
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#include <event.h>
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#include <libutp/utp.h>
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#include "transmission.h"
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#include "net.h"
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#include "session.h"
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#include "crypto.h"
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#include "peer-io.h"
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#include "peer-mgr.h"
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#include "tr-utp.h"
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/* Greg says 50ms works for them. */
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#define UTP_INTERVAL_US 50000
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static struct event *utp_timer = NULL;
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static void
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incoming(void *closure, struct UTPSocket *s)
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{
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tr_session *ss = (tr_session*)closure;
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struct sockaddr_storage from_storage;
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struct sockaddr *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;
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if( !tr_sessionIsUTPEnabled(ss) ) {
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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(from->sa_family == AF_INET) {
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struct sockaddr_in *sin = (struct sockaddr_in*)from;
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addr.type = TR_AF_INET;
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addr.addr.addr4.s_addr = sin->sin_addr.s_addr;
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port = sin->sin_port;
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} else if(from->sa_family == AF_INET6) {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)from;
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addr.type = TR_AF_INET6;
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addr.addr.addr6 = sin6->sin6_addr;
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port = sin6->sin6_port;
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} else {
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tr_nerr("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(ss->peerMgr, &addr, port, -1, s);
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}
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static void
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send_to(void *closure, const unsigned char *buf, size_t buflen,
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const struct sockaddr *to, socklen_t tolen)
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{
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tr_session *ss = (tr_session*)closure;
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if(to->sa_family == AF_INET && ss->udp_socket)
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sendto(ss->udp_socket, buf, buflen, 0, to, tolen);
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else if(to->sa_family == AF_INET6 && ss->udp_socket)
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sendto(ss->udp6_socket, buf, buflen, 0, to, tolen);
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}
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static void
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reset_timer( void )
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{
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int sec = 0;
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int usec = UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US);
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tr_timerAdd( utp_timer, sec, usec );
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}
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static void
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timer_callback(int s UNUSED, short type UNUSED, void *closure UNUSED)
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{
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UTP_CheckTimeouts();
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reset_timer();
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}
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int
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tr_utpPacket(const unsigned char *buf, size_t buflen,
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const struct sockaddr *from, socklen_t fromlen,
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tr_session *ss)
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{
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if(utp_timer == NULL)
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{
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utp_timer = evtimer_new( ss->event_base, timer_callback, NULL );
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if(utp_timer == NULL)
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return -1;
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reset_timer();
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}
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return UTP_IsIncomingUTP(incoming, send_to, ss,
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buf, buflen, from, fromlen);
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}
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void
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tr_utpClose( tr_session * session )
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{
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if( utp_timer )
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{
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evtimer_del( utp_timer );
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utp_timer = NULL;
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}
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}
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