source: trunk/libtransmission/tr-utp.c @ 11960

Last change on this file since 11960 was 11960, checked in by jordan, 11 years ago

add configure script switch to enable/disable utp

File size: 4.6 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#ifndef WITH_UTP
38
39int tr_utpPacket(const unsigned char *buf UNUSED, size_t buflen UNUSED,
40                 const struct sockaddr *from UNUSED, socklen_t fromlen UNUSED,
41                 tr_session *ss UNUSED) { return -1; }
42
43void tr_utpClose( tr_session * ss UNUSED ) { }
44
45void tr_utpSendTo(void *closure UNUSED,
46                  const unsigned char *buf UNUSED, size_t buflen UNUSED,
47                  const struct sockaddr *to UNUSED, socklen_t tolen UNUSED) { }
48
49#else
50
51/* Greg says 50ms works for them. */
52
53#define UTP_INTERVAL_US 50000
54
55static struct event *utp_timer = NULL;
56
57static void
58incoming(void *closure, struct UTPSocket *s)
59{
60    tr_session *ss = (tr_session*)closure;
61    struct sockaddr_storage from_storage;
62    struct sockaddr *from = (struct sockaddr*)&from_storage;
63    socklen_t fromlen = sizeof(from_storage);
64    tr_address addr;
65    tr_port port;
66
67    if( !tr_sessionIsUTPEnabled(ss) ) {
68        UTP_Close(s);
69        return;
70    }
71   
72    UTP_GetPeerName(s, from, &fromlen);
73    if(from->sa_family == AF_INET) {
74        struct sockaddr_in *sin = (struct sockaddr_in*)from;
75        addr.type = TR_AF_INET;
76        addr.addr.addr4.s_addr = sin->sin_addr.s_addr;
77        port = sin->sin_port;
78    } else if(from->sa_family == AF_INET6) {
79        struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)from;
80        addr.type = TR_AF_INET6;
81        addr.addr.addr6 = sin6->sin6_addr;
82        port = sin6->sin6_port;
83    } else {
84        tr_nerr("UTP", "Unknown socket family");
85        UTP_Close(s);
86        return;
87    }
88
89    tr_peerMgrAddIncoming(ss->peerMgr, &addr, port, -1, s);
90}
91
92void
93tr_utpSendTo(void *closure, const unsigned char *buf, size_t buflen,
94             const struct sockaddr *to, socklen_t tolen)
95{
96    tr_session *ss = (tr_session*)closure;
97
98    if(to->sa_family == AF_INET && ss->udp_socket)
99        sendto(ss->udp_socket, buf, buflen, 0, to, tolen);
100    else if(to->sa_family == AF_INET6 && ss->udp_socket)
101        sendto(ss->udp6_socket, buf, buflen, 0, to, tolen);
102}
103
104static void
105reset_timer(tr_session *ss)
106{
107    int sec;
108    int usec;
109    if( tr_sessionIsUTPEnabled( ss ) ) {
110        sec = 0;
111        usec = UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US);
112    } else {
113        /* If somebody has disabled uTP, then we still want to run
114           UTP_CheckTimeouts, in order to let closed sockets finish
115           gracefully and so on.  However, since we're not particularly
116           interested in that happening in a timely manner, we might as
117           well use a large timeout. */
118        sec = 2;
119        usec = tr_cryptoWeakRandInt( 1000000 );
120    }
121    tr_timerAdd( utp_timer, sec, usec );
122}
123
124static void
125timer_callback(int s UNUSED, short type UNUSED, void *closure)
126{
127    tr_session *ss = closure;
128    UTP_CheckTimeouts();
129    reset_timer( ss );
130}
131
132int
133tr_utpPacket(const unsigned char *buf, size_t buflen,
134             const struct sockaddr *from, socklen_t fromlen,
135             tr_session *ss)
136{
137    if(utp_timer == NULL)
138    {
139        utp_timer = evtimer_new( ss->event_base, timer_callback, ss );
140        if(utp_timer == NULL)
141            return -1;
142        reset_timer( ss );
143    }
144
145    return UTP_IsIncomingUTP(incoming, tr_utpSendTo, ss,
146                             buf, buflen, from, fromlen);
147}
148
149void
150tr_utpClose( tr_session * session UNUSED )
151{
152    if( utp_timer )
153    {
154        evtimer_del( utp_timer );
155        utp_timer = NULL;
156    }
157}
158
159#endif /* #ifndef WITH_UTP ... else */
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