/
netsock.cpp
executable file
·243 lines (211 loc) · 5.51 KB
/
netsock.cpp
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
#include "net/netsock.h"
#include "net/netpacket.h"
#include "net/netaddr.h"
#include "settings.h"
#include "crypto.h"
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <unistd.h>
#include <cstring>
#include <system_error>
#include <iostream>
using namespace std;
NetSock::NetSock()
: sockfd{0}, connected{false}
{
sockfd = socket(AF_INET, SOCK_STREAM, 0);
}
NetSock::NetSock(const NetAddr& addr)
: NetSock()
{
connect(addr);
}
NetSock::NetSock(int sockfd, bool connected)
: sockfd{sockfd}, connected{connected}
{
}
NetSock::NetSock(NetSock&& other)
{
sockfd = other.sockfd;
connected = other.connected;
other.connected = false;
other.sockfd = -1;
}
NetSock::~NetSock()
{
//cout << "Socket "<<sockfd <<" closed"<<endl;
close(sockfd);
}
bool NetSock::connect(const NetAddr& addr)
{
int result = ::connect(sockfd, addr.sockaddr->ai_addr, addr.sockaddr->ai_addrlen);
connected = (result >= 0);
return connected;
}
bool NetSock::connect(const std::string& uri)
{
try {
return connect(NetAddr{uri});
} catch (...) {
return false;
}
}
bool NetSock::isConnected()
{
return connected;
}
void NetSock::send(const NetPacket& packet) const
{
std::vector<char> data = packet.serialize();
if (!connected)
throw std::runtime_error("NetSock::send: Not connected");
int r = ::write(sockfd, &data[0], data.size());
if (r<0)
{
perror("NetSock::send");
throw runtime_error("NetSock::send: Write failed");
}
else if ((unsigned)r!=data.size())
{
perror("NetSock::send");
throw runtime_error("NetSock::send: Failed to send all data");
}
}
void NetSock::sendEncrypted(NetPacket &packet, const Server &s, const PublicKey &pk) const
{
Crypto::encryptPacket(packet, s, pk);
send(packet);
}
void NetSock::sendEncrypted(NetPacket &&packet, const Server &s, const PublicKey &pk) const
{
sendEncrypted(packet, s, pk);
}
NetPacket NetSock::secureRequest(NetPacket &packet, const Server &s, const PublicKey &pk) const
{
sendEncrypted(packet, s, pk);
return recvEncryptedPacket(s, pk);
}
NetPacket NetSock::secureRequest(NetPacket&& packet, const Server& s, const PublicKey& pk) const
{
return secureRequest(packet, s, pk);
}
bool NetSock::listen()
{
sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(PORT_NUMBER);
if (::bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr))<0)
return false;
::listen(sockfd,5);
return true;
}
NetSock NetSock::accept()
{
sockaddr_in cli_addr;
socklen_t clilen = sizeof(cli_addr);
int newsockfd = ::accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
return NetSock(newsockfd, true);
}
std::vector<char> NetSock::recv(int count) const
{
std::vector<char> data;
if (!count)
return data;
const size_t bufsize = 4096;
char* buf = new char[bufsize];
unsigned totalReceived = 0;
int result;
do {
unsigned toReceive;
if (count == -1)
toReceive = bufsize;
else
toReceive = min((size_t)(count-totalReceived), bufsize);
result = ::read(sockfd, buf, toReceive);
if (result <= 0)
{
perror("NetSock::recv");
break;
}
totalReceived += result;
data.insert(end(data), buf, buf+result);
} while (totalReceived < (unsigned)count);
delete[] buf;
return data;
}
uint8_t NetSock::recvByte() const
{
uint8_t byte;
int result = ::read(sockfd, &byte, 1);
if (result == 0)
throw std::runtime_error("NetSock::recvByte: Remote host closed connection");
else if (result < 0)
throw std::runtime_error("NetSock::recvByte: Error reading from socket");
else
return byte;
}
NetPacket NetSock::recvPacket() const
{
return NetPacket::deserialize(*this);
}
NetPacket NetSock::recvEncryptedPacket(const Server& s, const PublicKey& pk) const
{
NetPacket p = NetPacket::deserialize(*this);
Crypto::decryptPacket(p, s, pk);
return p;
}
bool NetSock::isShutdown()
{
pollfd fds;
fds.fd = sockfd;
fds.events = POLLRDHUP | POLLHUP | POLLIN;
poll(&fds, 1, 1000);
return (fds.revents & POLLRDHUP) | (fds.revents & POLLHUP);
}
bool NetSock::isPacketAvailable() const
{
try {
/// Read vuint packet size from socket
unsigned char num3;
size_t size = 0;
int num2 = 0;
unsigned i=0;
do
{
if (bytesAvailable() < i+1)
return false;
num3 = peekByte(); i++;
size |= (num3 & 0x7f) << num2;
num2 += 7;
} while ((num3 & 0x80) != 0);
if (bytesAvailable() < i+size)
return false;
else
return true;
} catch(...) {
return false;
}
}
size_t NetSock::bytesAvailable() const
{
size_t size;
if (ioctl(sockfd, FIONREAD, &size) < 0)
throw runtime_error("NetSock::bytesAvailable: ioctl FIONREAD failure");
return size;
}
uint8_t NetSock::peekByte() const
{
uint8_t byte;
int result = ::recv(sockfd, &byte, 1, MSG_PEEK | MSG_DONTWAIT);
if (result == 0)
throw std::runtime_error("NetSock::peekByte: Remote host closed connection");
else if (result < 0)
throw std::runtime_error("NetSock::peekByte: Error reading from socket");
else
return byte;
}