source: trunk/libtransmission/tr-utp.c @ 11949

Last change on this file since 11949 was 11949, checked in by jch, 11 years ago

When uTP is disabled, don't call UTP_CheckTimeouts too often.

File size: 4.1 KB
Line 
1/*
2Copyright (c) 2010 by Juliusz Chroboczek
3
4Permission is hereby granted, free of charge, to any person obtaining a copy
5of this software and associated documentation files (the "Software"), to deal
6in the Software without restriction, including without limitation the rights
7to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8copies of the Software, and to permit persons to whom the Software is
9furnished to do so, subject to the following conditions:
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20THE SOFTWARE.
21
22*/
23
24#include <unistd.h>
25
26#include <event.h>
27#include <libutp/utp.h>
28
29#include "transmission.h"
30#include "net.h"
31#include "session.h"
32#include "crypto.h"
33#include "peer-io.h"
34#include "peer-mgr.h"
35#include "tr-utp.h"
36
37/* Greg says 50ms works for them. */
38
39#define UTP_INTERVAL_US 50000
40
41static struct event *utp_timer = NULL;
42
43static void
44incoming(void *closure, struct UTPSocket *s)
45{
46    tr_session *ss = (tr_session*)closure;
47    struct sockaddr_storage from_storage;
48    struct sockaddr *from = (struct sockaddr*)&from_storage;
49    socklen_t fromlen = sizeof(from_storage);
50    tr_address addr;
51    tr_port port;
52
53    if( !tr_sessionIsUTPEnabled(ss) ) {
54        UTP_Close(s);
55        return;
56    }
57   
58    UTP_GetPeerName(s, from, &fromlen);
59    if(from->sa_family == AF_INET) {
60        struct sockaddr_in *sin = (struct sockaddr_in*)from;
61        addr.type = TR_AF_INET;
62        addr.addr.addr4.s_addr = sin->sin_addr.s_addr;
63        port = sin->sin_port;
64    } else if(from->sa_family == AF_INET6) {
65        struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)from;
66        addr.type = TR_AF_INET6;
67        addr.addr.addr6 = sin6->sin6_addr;
68        port = sin6->sin6_port;
69    } else {
70        tr_nerr("UTP", "Unknown socket family");
71        UTP_Close(s);
72        return;
73    }
74
75    tr_peerMgrAddIncoming(ss->peerMgr, &addr, port, -1, s);
76}
77
78void
79tr_utpSendTo(void *closure, const unsigned char *buf, size_t buflen,
80             const struct sockaddr *to, socklen_t tolen)
81{
82    tr_session *ss = (tr_session*)closure;
83
84    if(to->sa_family == AF_INET && ss->udp_socket)
85        sendto(ss->udp_socket, buf, buflen, 0, to, tolen);
86    else if(to->sa_family == AF_INET6 && ss->udp_socket)
87        sendto(ss->udp6_socket, buf, buflen, 0, to, tolen);
88}
89
90static void
91reset_timer(tr_session *ss)
92{
93    int sec;
94    int usec;
95    if( tr_sessionIsUTPEnabled( ss ) ) {
96        sec = 0;
97        usec = UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US);
98    } else {
99        /* If somebody has disabled uTP, then we still want to run
100           UTP_CheckTimeouts, in order to let closed sockets finish
101           gracefully and so on.  However, since we're not particularly
102           interested in that happening in a timely manner, we might as
103           well use a large timeout. */
104        sec = 2;
105        usec = tr_cryptoWeakRandInt( 1000000 );
106    }
107    tr_timerAdd( utp_timer, sec, usec );
108}
109
110static void
111timer_callback(int s UNUSED, short type UNUSED, void *closure)
112{
113    tr_session *ss = closure;
114    UTP_CheckTimeouts();
115    reset_timer( ss );
116}
117
118int
119tr_utpPacket(const unsigned char *buf, size_t buflen,
120             const struct sockaddr *from, socklen_t fromlen,
121             tr_session *ss)
122{
123    if(utp_timer == NULL)
124    {
125        utp_timer = evtimer_new( ss->event_base, timer_callback, ss );
126        if(utp_timer == NULL)
127            return -1;
128        reset_timer( ss );
129    }
130
131    return UTP_IsIncomingUTP(incoming, tr_utpSendTo, ss,
132                             buf, buflen, from, fromlen);
133}
134
135void
136tr_utpClose( tr_session * session UNUSED )
137{
138    if( utp_timer )
139    {
140        evtimer_del( utp_timer );
141        utp_timer = NULL;
142    }
143}
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