source: trunk/libtransmission/tr-utp.c @ 11944

Last change on this file since 11944 was 11944, checked in by jordan, 11 years ago

silence compiler warning

File size: 3.6 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/* 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( void )
92{
93    int sec = 0;
94    int usec = UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US);
95    tr_timerAdd( utp_timer, sec, usec );
96}
97
98static void
99timer_callback(int s UNUSED, short type UNUSED, void *closure UNUSED)
100{
101    UTP_CheckTimeouts();
102    reset_timer();
103}
104
105int
106tr_utpPacket(const unsigned char *buf, size_t buflen,
107             const struct sockaddr *from, socklen_t fromlen,
108             tr_session *ss)
109{
110    if(utp_timer == NULL)
111    {
112        utp_timer = evtimer_new( ss->event_base, timer_callback, NULL );
113        if(utp_timer == NULL)
114            return -1;
115        reset_timer();
116    }
117
118    return UTP_IsIncomingUTP(incoming, tr_utpSendTo, ss,
119                             buf, buflen, from, fromlen);
120}
121
122void
123tr_utpClose( tr_session * session UNUSED )
124{
125    if( utp_timer )
126    {
127        evtimer_del( utp_timer );
128        utp_timer = NULL;
129    }
130}
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