1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/tools/quic/quic_server.h"
#include <errno.h>
#include <features.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include "net/base/ip_endpoint.h"
#include "net/quic/crypto/crypto_handshake.h"
#include "net/quic/crypto/quic_random.h"
#include "net/quic/quic_clock.h"
#include "net/quic/quic_crypto_stream.h"
#include "net/quic/quic_data_reader.h"
#include "net/quic/quic_protocol.h"
#include "net/tools/quic/quic_in_memory_cache.h"
#include "net/tools/quic/quic_socket_utils.h"
#define MMSG_MORE 0
#ifndef SO_RXQ_OVFL
#define SO_RXQ_OVFL 40
#endif
const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
static const char kSourceAddressTokenSecret[] = "secret";
namespace net {
namespace tools {
QuicServer::QuicServer()
: port_(0),
fd_(-1),
packets_dropped_(0),
overflow_supported_(false),
use_recvmmsg_(false),
crypto_config_(kSourceAddressTokenSecret, QuicRandom::GetInstance()) {
// Use hardcoded crypto parameters for now.
config_.SetDefaults();
Initialize();
}
QuicServer::QuicServer(const QuicConfig& config)
: port_(0),
fd_(-1),
packets_dropped_(0),
overflow_supported_(false),
use_recvmmsg_(false),
config_(config),
crypto_config_(kSourceAddressTokenSecret, QuicRandom::GetInstance()) {
Initialize();
}
void QuicServer::Initialize() {
#if MMSG_MORE
use_recvmmsg_ = true;
#endif
epoll_server_.set_timeout_in_us(50 * 1000);
// Initialize the in memory cache now.
QuicInMemoryCache::GetInstance();
QuicEpollClock clock(&epoll_server_);
scoped_ptr<CryptoHandshakeMessage> scfg(
crypto_config_.AddDefaultConfig(
QuicRandom::GetInstance(), &clock,
QuicCryptoServerConfig::ConfigOptions()));
}
QuicServer::~QuicServer() {
}
bool QuicServer::Listen(const IPEndPoint& address) {
port_ = address.port();
int address_family = address.GetSockAddrFamily();
fd_ = socket(address_family, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
if (fd_ < 0) {
LOG(ERROR) << "CreateSocket() failed: " << strerror(errno);
return false;
}
int rc = QuicSocketUtils::SetGetAddressInfo(fd_, address_family);
if (rc < 0) {
LOG(ERROR) << "IP detection not supported" << strerror(errno);
return false;
}
int get_overflow = 1;
rc = setsockopt(
fd_, SOL_SOCKET, SO_RXQ_OVFL, &get_overflow, sizeof(get_overflow));
if (rc < 0) {
DLOG(WARNING) << "Socket overflow detection not supported";
} else {
overflow_supported_ = true;
}
// Enable the socket option that allows the local address to be
// returned if the socket is bound to more than on address.
int get_local_ip = 1;
rc = setsockopt(fd_, IPPROTO_IP, IP_PKTINFO,
&get_local_ip, sizeof(get_local_ip));
if (rc == 0 && address_family == AF_INET6) {
rc = setsockopt(fd_, IPPROTO_IPV6, IPV6_RECVPKTINFO,
&get_local_ip, sizeof(get_local_ip));
}
if (rc != 0) {
LOG(ERROR) << "Failed to set required socket options";
return false;
}
sockaddr_storage raw_addr;
socklen_t raw_addr_len = sizeof(raw_addr);
CHECK(address.ToSockAddr(reinterpret_cast<sockaddr*>(&raw_addr),
&raw_addr_len));
rc = bind(fd_,
reinterpret_cast<const sockaddr*>(&raw_addr),
sizeof(raw_addr));
if (rc < 0) {
LOG(ERROR) << "Bind failed: " << strerror(errno);
return false;
}
LOG(INFO) << "Listening on " << address.ToString();
if (port_ == 0) {
SockaddrStorage storage;
IPEndPoint server_address;
if (getsockname(fd_, storage.addr, &storage.addr_len) != 0 ||
!server_address.FromSockAddr(storage.addr, storage.addr_len)) {
LOG(ERROR) << "Unable to get self address. Error: " << strerror(errno);
return false;
}
port_ = server_address.port();
LOG(INFO) << "Kernel assigned port is " << port_;
}
epoll_server_.RegisterFD(fd_, this, kEpollFlags);
dispatcher_.reset(new QuicDispatcher(config_, crypto_config_, fd_,
&epoll_server_));
return true;
}
void QuicServer::WaitForEvents() {
epoll_server_.WaitForEventsAndExecuteCallbacks();
}
void QuicServer::Shutdown() {
// Before we shut down the epoll server, give all active sessions a chance to
// notify clients that they're closing.
dispatcher_->Shutdown();
close(fd_);
fd_ = -1;
}
void QuicServer::OnEvent(int fd, EpollEvent* event) {
DCHECK_EQ(fd, fd_);
event->out_ready_mask = 0;
if (event->in_events & EPOLLIN) {
LOG(ERROR) << "EPOLLIN";
bool read = true;
while (read) {
read = ReadAndDispatchSinglePacket(
fd_, port_, dispatcher_.get(),
overflow_supported_ ? &packets_dropped_ : NULL);
}
}
if (event->in_events & EPOLLOUT) {
bool can_write_more = dispatcher_->OnCanWrite();
if (can_write_more) {
event->out_ready_mask |= EPOLLOUT;
}
}
if (event->in_events & EPOLLERR) {
}
}
/* static */
void QuicServer::MaybeDispatchPacket(QuicDispatcher* dispatcher,
const QuicEncryptedPacket& packet,
const IPEndPoint& server_address,
const IPEndPoint& client_address) {
QuicGuid guid;
if (!QuicFramer::ReadGuidFromPacket(packet, &guid)) {
return;
}
dispatcher->ProcessPacket(server_address, client_address, guid, packet);
}
bool QuicServer::ReadAndDispatchSinglePacket(int fd,
int port,
QuicDispatcher* dispatcher,
int* packets_dropped) {
// Allocate some extra space so we can send an error if the client goes over
// the limit.
char buf[2 * kMaxPacketSize];
IPEndPoint client_address;
IPAddressNumber server_ip;
int bytes_read =
QuicSocketUtils::ReadPacket(fd, buf, arraysize(buf),
packets_dropped,
&server_ip, &client_address);
if (bytes_read < 0) {
return false; // We failed to read.
}
QuicEncryptedPacket packet(buf, bytes_read, false);
IPEndPoint server_address(server_ip, port);
MaybeDispatchPacket(dispatcher, packet, server_address, client_address);
return true;
}
} // namespace tools
} // namespace net
|
