1 /* <!-- copyright */
2 /*
3 * aria2 - The high speed download utility
4 *
5 * Copyright (C) 2010 Tatsuhiro Tsujikawa
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * In addition, as a special exception, the copyright holders give
22 * permission to link the code of portions of this program with the
23 * OpenSSL library under certain conditions as described in each
24 * individual source file, and distribute linked combinations
25 * including the two.
26 * You must obey the GNU General Public License in all respects
27 * for all of the code used other than OpenSSL. If you modify
28 * file(s) with this exception, you may extend this exception to your
29 * version of the file(s), but you are not obligated to do so. If you
30 * do not wish to do so, delete this exception statement from your
31 * version. If you delete this exception statement from all source
32 * files in the program, then also delete it here.
33 */
34 /* copyright --> */
35
36 #include "LpdMessageDispatcher.h"
37 #include "SocketCore.h"
38 #include "A2STR.h"
39 #include "util.h"
40 #include "Logger.h"
41 #include "LogFactory.h"
42 #include "BtConstants.h"
43 #include "RecoverableException.h"
44 #include "wallclock.h"
45 #include "fmt.h"
46
47 namespace aria2 {
48
LpdMessageDispatcher(const std::string & infoHash,uint16_t port,const std::string & multicastAddress,uint16_t multicastPort,std::chrono::seconds interval)49 LpdMessageDispatcher::LpdMessageDispatcher(const std::string& infoHash,
50 uint16_t port,
51 const std::string& multicastAddress,
52 uint16_t multicastPort,
53 std::chrono::seconds interval)
54 : infoHash_(infoHash),
55 port_(port),
56 multicastAddress_(multicastAddress),
57 multicastPort_(multicastPort),
58 timer_(Timer::zero()),
59 interval_(std::move(interval)),
60 request_(bittorrent::createLpdRequest(multicastAddress_, multicastPort_,
61 infoHash_, port_))
62 {
63 }
64
65 LpdMessageDispatcher::~LpdMessageDispatcher() = default;
66
init(const std::string & localAddr,unsigned char ttl,unsigned char loop)67 bool LpdMessageDispatcher::init(const std::string& localAddr, unsigned char ttl,
68 unsigned char loop)
69 {
70 try {
71 socket_ = std::make_shared<SocketCore>(SOCK_DGRAM);
72 socket_->create(AF_INET);
73 A2_LOG_DEBUG(
74 fmt("Setting multicast outgoing interface=%s", localAddr.c_str()));
75 socket_->setMulticastInterface(localAddr);
76 A2_LOG_DEBUG(
77 fmt("Setting multicast ttl=%u", static_cast<unsigned int>(ttl)));
78 socket_->setMulticastTtl(ttl);
79 A2_LOG_DEBUG(
80 fmt("Setting multicast loop=%u", static_cast<unsigned int>(loop)));
81 socket_->setMulticastLoop(loop);
82 return true;
83 }
84 catch (RecoverableException& e) {
85 A2_LOG_ERROR_EX("Failed to initialize LpdMessageDispatcher.", e);
86 }
87 return false;
88 }
89
sendMessage()90 bool LpdMessageDispatcher::sendMessage()
91 {
92 return socket_->writeData(request_.c_str(), request_.size(),
93 multicastAddress_,
94 multicastPort_) == (ssize_t)request_.size();
95 }
96
isAnnounceReady() const97 bool LpdMessageDispatcher::isAnnounceReady() const
98 {
99 return timer_.difference(global::wallclock()) >= interval_;
100 }
101
resetAnnounceTimer()102 void LpdMessageDispatcher::resetAnnounceTimer()
103 {
104 timer_ = global::wallclock();
105 }
106
107 namespace bittorrent {
108
createLpdRequest(const std::string & multicastAddress,uint16_t multicastPort,const std::string & infoHash,uint16_t port)109 std::string createLpdRequest(const std::string& multicastAddress,
110 uint16_t multicastPort,
111 const std::string& infoHash, uint16_t port)
112 {
113 return fmt("BT-SEARCH * HTTP/1.1\r\n"
114 "Host: %s:%u\r\n"
115 "Port: %u\r\n"
116 "Infohash: %s\r\n"
117 "\r\n\r\n",
118 multicastAddress.c_str(), multicastPort, port,
119 util::toHex(infoHash).c_str());
120 }
121
122 } // namespace bittorrent
123
124 } // namespace aria2
125