source: trunk/libtransmission/tr-utp.c @ 11905

Last change on this file since 11905 was 11905, checked in by jch, 11 years ago

Check for UTP timeouts every 50ms or so.

Greg says that works for them.

File size: 3.4 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 "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    UTP_GetPeerName(s, from, &fromlen);
54    if(from->sa_family == AF_INET) {
55        struct sockaddr_in *sin = (struct sockaddr_in*)from;
56        addr.type = TR_AF_INET;
57        addr.addr.addr4.s_addr = sin->sin_addr.s_addr;
58        port = sin->sin_port;
59    } else if(from->sa_family == AF_INET6) {
60        struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)from;
61        addr.type = TR_AF_INET6;
62        addr.addr.addr6 = sin6->sin6_addr;
63        port = sin6->sin6_port;
64    } else {
65        tr_nerr("UTP", "Unknown socket family");
66        UTP_Close(s);
67        return;
68    }
69
70    tr_peerMgrAddIncoming(ss->peerMgr, &addr, port, -1, s);
71}
72
73static void
74send_to(void *closure, const unsigned char *buf, size_t buflen,
75        const struct sockaddr *to, socklen_t tolen)
76{
77    tr_session *ss = (tr_session*)closure;
78
79    if(to->sa_family == AF_INET && ss->udp_socket)
80        sendto(ss->udp_socket, buf, buflen, 0, to, tolen);
81    else if(to->sa_family == AF_INET6 && ss->udp_socket)
82        sendto(ss->udp6_socket, buf, buflen, 0, to, tolen);
83}
84
85static void
86timer_callback(int s UNUSED, short type UNUSED, void *closure UNUSED)
87{
88    UTP_CheckTimeouts();
89    tr_timerAdd(utp_timer, 0,
90                UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US));
91}
92
93int
94tr_utpPacket(const unsigned char *buf, size_t buflen,
95             const struct sockaddr *from, socklen_t fromlen,
96             tr_session *ss)
97{
98    if(utp_timer == NULL) {
99        utp_timer = tr_new0(struct event, 1);
100        if(utp_timer == NULL)
101            return -1;
102        evtimer_set(utp_timer, timer_callback, NULL);
103        tr_timerAdd(utp_timer, 0,
104                    UTP_INTERVAL_US / 2 + tr_cryptoWeakRandInt(UTP_INTERVAL_US));
105    }
106
107    return UTP_IsIncomingUTP(incoming, send_to, ss,
108                             buf, buflen, from, fromlen);
109}
110
111   
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