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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
#include "apps.h"
#if defined(BOTAN_HAS_TLS)
#include <botan/tls_server.h>
#include <botan/hex.h>
#include <botan/rsa.h>
#include <botan/dsa.h>
#include <botan/x509self.h>
#include <botan/secqueue.h>
#include "credentials.h"
using namespace Botan;
using namespace std::placeholders;
#include <list>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
namespace {
int make_server_socket(const std::string& transport, u16bit port)
{
int type = (transport == "tcp") ? SOCK_STREAM : SOCK_DGRAM;
int fd = ::socket(PF_INET, type, 0);
if(fd == -1)
throw std::runtime_error("Unable to acquire socket");
sockaddr_in socket_info;
::memset(&socket_info, 0, sizeof(socket_info));
socket_info.sin_family = AF_INET;
socket_info.sin_port = htons(port);
// FIXME: support limiting listeners
socket_info.sin_addr.s_addr = INADDR_ANY;
if(::bind(fd, (sockaddr*)&socket_info, sizeof(struct sockaddr)) != 0)
{
::close(fd);
throw std::runtime_error("server bind failed");
}
if(transport != "udp")
{
if(::listen(fd, 100) != 0)
{
::close(fd);
throw std::runtime_error("listen failed");
}
}
return fd;
}
bool handshake_complete(const TLS::Session& session)
{
std::cout << "Handshake complete, " << session.version().to_string()
<< " using " << session.ciphersuite().to_string() << "\n";
if(!session.session_id().empty())
std::cout << "Session ID " << hex_encode(session.session_id()) << "\n";
if(!session.session_ticket().empty())
std::cout << "Session ticket " << hex_encode(session.session_ticket()) << "\n";
return true;
}
void dgram_socket_write(int sockfd, const byte buf[], size_t length)
{
ssize_t sent = ::send(sockfd, buf, length, MSG_NOSIGNAL);
if(sent == -1)
std::cout << "Error writing to socket - " << strerror(errno) << "\n";
else if(sent != static_cast<ssize_t>(length))
std::cout << "Packet of length " << length << " truncated to " << sent << "\n";
}
void stream_socket_write(int sockfd, const byte buf[], size_t length)
{
size_t offset = 0;
while(length)
{
ssize_t sent = ::send(sockfd, (const char*)buf + offset,
length, MSG_NOSIGNAL);
if(sent == -1)
{
if(errno == EINTR)
sent = 0;
else
throw std::runtime_error("Socket::write: Socket write failed");
}
offset += sent;
length -= sent;
}
}
void alert_received(TLS::Alert alert, const byte[], size_t)
{
std::cout << "Alert: " << alert.type_string() << "\n";
}
int tls_server(int argc, char* argv[])
{
int port = 4433;
std::string transport = "tcp";
if(argc >= 2)
port = to_u32bit(argv[1]);
if(argc >= 3)
transport = argv[2];
try
{
AutoSeeded_RNG rng;
TLS::Policy policy;
TLS::Session_Manager_In_Memory session_manager(rng);
Credentials_Manager_Simple creds(rng);
/*
* These are the protocols we advertise to the client, but the
* client will send back whatever it actually plans on talking,
* which may or may not take into account what we advertise.
*/
const std::vector<std::string> protocols = { "echo/1.0", "echo/1.1" };
std::cout << "Listening for new connections on " << transport << " port " << port << "\n";
int server_fd = make_server_socket(transport, port);
while(true)
{
try
{
int fd;
if(transport == "tcp")
fd = ::accept(server_fd, nullptr, nullptr);
else
{
struct sockaddr_in from;
socklen_t from_len = sizeof(sockaddr_in);
if(::recvfrom(server_fd, nullptr, 0, MSG_PEEK,
(struct sockaddr*)&from, &from_len) != 0)
throw std::runtime_error("Could not peek next packet");
if(::connect(server_fd, (struct sockaddr*)&from, from_len) != 0)
throw std::runtime_error("Could not connect UDP socket");
fd = server_fd;
}
std::cout << "New connection received\n";
auto socket_write =
(transport == "tcp") ?
std::bind(stream_socket_write, fd, _1, _2) :
std::bind(dgram_socket_write, fd, _1, _2);
std::string s;
std::list<std::string> pending_output;
pending_output.push_back("Welcome to the best echo server evar\n");
auto proc_fn = [&](const byte input[], size_t input_len)
{
for(size_t i = 0; i != input_len; ++i)
{
const char c = static_cast<char>(input[i]);
s += c;
if(c == '\n')
{
pending_output.push_back(s);
s.clear();
}
}
};
TLS::Server server(socket_write,
proc_fn,
alert_received,
handshake_complete,
session_manager,
creds,
policy,
rng,
protocols,
(transport != "tcp"));
while(!server.is_closed())
{
byte buf[4*1024] = { 0 };
ssize_t got = ::read(fd, buf, sizeof(buf));
if(got == -1)
{
std::cout << "Error in socket read - " << strerror(errno) << "\n";
break;
}
if(got == 0)
{
std::cout << "EOF on socket\n";
break;
}
server.received_data(buf, got);
while(server.is_active() && !pending_output.empty())
{
std::string s = pending_output.front();
pending_output.pop_front();
server.send(s);
if(s == "quit\n")
server.close();
}
}
if(transport == "tcp")
::close(fd);
}
catch(std::exception& e)
{
std::cout << "Connection problem: " << e.what() << "\n";
return 1;
}
}
}
catch(std::exception& e)
{
std::cout << e.what() << "\n";
return 1;
}
return 0;
}
REGISTER_APP(tls_server);
}
#endif
|
