summaryrefslogtreecommitdiff
path: root/src/PracticalSocket.cpp
blob: 2b08e09b305b1b083caa8e36291d7d74e5d3e719 (plain) (blame)
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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 *  anytun
 *
 *  The secure anycast tunneling protocol (satp) defines a protocol used
 *  for communication between any combination of unicast and anycast
 *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
 *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
 *  ethernet, ip, arp ...). satp directly includes cryptography and
 *  message authentication based on the methodes used by SRTP.  It is
 *  intended to deliver a generic, scaleable and secure solution for
 *  tunneling and relaying of packets of any protocol.
 *
 *
 *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl, 
 *                          Christian Pointner <satp@wirdorange.org>
 *
 *  This file is part of Anytun.
 *
 *  Anytun is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3 as
 *  published by the Free Software Foundation.
 *
 *  Anytun is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "datatypes.h"

// this is from: http://cs.ecs.baylor.edu/~donahoo/practical/CSockets/practical/
// and this is their header:
/*
 *   C++ sockets on Unix and Windows
 *   Copyright (C) 2002
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "PracticalSocket.h"

#ifdef WIN32
  #include <winsock.h>         // For socket(), connect(), send(), and recv()
  typedef int socklen_t;
  typedef char raw_type;       // Type used for raw data on this platform
#else
  #include <sys/types.h>       // For data types
  #include <sys/socket.h>      // For socket(), connect(), send(), and recv()
  #include <netdb.h>           // For gethostbyname()
  #include <arpa/inet.h>       // For inet_addr()
  #include <unistd.h>          // For close()
  #include <netinet/in.h>      // For sockaddr_in
  #include <poll.h>
  typedef void raw_type;       // Type used for raw data on this platform
#endif

#include <errno.h>             // For errno

using namespace std;

#ifdef WIN32
static bool initialized = false;
#endif

// SocketException Code

SocketException::SocketException(const string &message, bool inclSysMsg)
  throw() : userMessage(message) {
  if (inclSysMsg) {
    userMessage.append(": ");
    char buf[STERROR_TEXT_MAX];
    buf[0] = 0;
    strerror_r(errno, buf, STERROR_TEXT_MAX);
    userMessage.append(buf);
  }
}

SocketException::~SocketException() throw() {
}

const char *SocketException::what() const throw() {
  return userMessage.c_str();
}

// Function to fill in address structure given an address and port
static void fillAddr(const string &address, unsigned short port, 
                     sockaddr_in &addr) {
  memset(&addr, 0, sizeof(addr));  // Zero out address structure
  addr.sin_family = AF_INET;       // Internet address

  hostent *host;  // Resolve name
  if ((host = gethostbyname(address.c_str())) == NULL) {
    // strerror() will not work for gethostbyname() and hstrerror() 
    // is supposedly obsolete
    throw SocketException("Failed to resolve name (gethostbyname())");
  }
  addr.sin_addr.s_addr = *((unsigned long *) host->h_addr_list[0]);

  addr.sin_port = htons(port);     // Assign port in network byte order
}

// Socket Code

Socket::Socket(int type, int protocol) throw(SocketException) {
  #ifdef WIN32
    if (!initialized) {
      WORD wVersionRequested;
      WSADATA wsaData;

      wVersionRequested = MAKEWORD(2, 0);              // Request WinSock v2.0
      if (WSAStartup(wVersionRequested, &wsaData) != 0) {  // Load WinSock DLL
        throw SocketException("Unable to load WinSock DLL");
      }
      initialized = true;
    }
  #endif

  // Make a new socket
  if ((sockDesc = socket(PF_INET, type, protocol)) < 0) {
    throw SocketException("Socket creation failed (socket())", true);
  }
}

Socket::Socket(int sockDesc) {
  this->sockDesc = sockDesc;
}

Socket::~Socket() {
  #ifdef WIN32
    ::closesocket(sockDesc);
  #else
    ::close(sockDesc);
  #endif
  sockDesc = -1;
}

string Socket::getLocalAddress() throw(SocketException) {
  sockaddr_in addr;
  unsigned int addr_len = sizeof(addr);

  if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
    throw SocketException("Fetch of local address failed (getsockname())", true);
  }
  return inet_ntoa(addr.sin_addr);
}

unsigned short Socket::getLocalPort() throw(SocketException) {
  sockaddr_in addr;
  unsigned int addr_len = sizeof(addr);

  if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
    throw SocketException("Fetch of local port failed (getsockname())", true);
  }
  return ntohs(addr.sin_port);
}

void Socket::setLocalPort(unsigned short localPort) throw(SocketException) {
  // Bind the socket to its port
  sockaddr_in localAddr;
  memset(&localAddr, 0, sizeof(localAddr));
  localAddr.sin_family = AF_INET;
  localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  localAddr.sin_port = htons(localPort);

  if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0) {
    throw SocketException("Set of local port failed (bind())", true);
  }
}

void Socket::setLocalAddressAndPort(const string &localAddress,
    unsigned short localPort) throw(SocketException) {
  // Get the address of the requested host
  sockaddr_in localAddr;
  fillAddr(localAddress, localPort, localAddr);

  if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0) {
    throw SocketException("Set of local address and port failed (bind())", true);
  }
}

void Socket::setSocketOpt(int optionName, const void* optionValue, socklen_t optionLen)
  throw(SocketException) 
{
  if (::setsockopt(sockDesc, SOL_SOCKET, optionName, optionValue, optionLen) < 0) {
    throw SocketException("setSockopt failed", true);
  }
}

void Socket::cleanUp() throw(SocketException) {
  #ifdef WIN32
    if (WSACleanup() != 0) {
      throw SocketException("WSACleanup() failed");
    }
  #endif
}

unsigned short Socket::resolveService(const string &service,
                                      const string &protocol) {
  struct servent *serv;        /* Structure containing service information */

  if ((serv = getservbyname(service.c_str(), protocol.c_str())) == NULL)
    return atoi(service.c_str());  /* Service is port number */
  else 
    return ntohs(serv->s_port);    /* Found port (network byte order) by name */
}

// CommunicatingSocket Code

CommunicatingSocket::CommunicatingSocket(int type, int protocol)  
    throw(SocketException) : Socket(type, protocol) {
}

CommunicatingSocket::CommunicatingSocket(int newConnSD) : Socket(newConnSD) {
}

void CommunicatingSocket::connect(const string &foreignAddress,
    unsigned short foreignPort) throw(SocketException) {
  // Get the address of the requested host
  sockaddr_in destAddr;
  fillAddr(foreignAddress, foreignPort, destAddr);

  // Try to connect to the given port
  if (::connect(sockDesc, (sockaddr *) &destAddr, sizeof(destAddr)) < 0) {
    throw SocketException("Connect failed (connect())", true);
  }
}

void CommunicatingSocket::send(const void *buffer, int bufferLen) 
    throw(SocketException) {
  if (::send(sockDesc, (raw_type *) buffer, bufferLen, 0) < 0) {
    throw SocketException("Send failed (send())", true);
  }
}

int CommunicatingSocket::recv(void *buffer, int bufferLen) 
    throw(SocketException) {
  int rtn;
  if ((rtn = ::recv(sockDesc, (raw_type *) buffer, bufferLen, 0)) < 0) {
    throw SocketException("Received failed (recv())", true);
  }

  return rtn;
}

int CommunicatingSocket::recvNonBlocking(void *buffer, int bufferLen, int timeOut)
    throw(SocketException) 
{
  struct pollfd pfd[1];
  pfd[0].fd = sockDesc;
  pfd[0].events = POLLIN;  
  int rtn = poll(pfd,1,timeOut);
  if(rtn > 0) {
    if ((rtn = ::recv(sockDesc, (raw_type *) buffer, bufferLen, 0)) < 0) {
      throw SocketException("non blocking receive failed", true);
    }
    if(!rtn) {
      throw SocketException("connection closed by peer", false);
    }
  }  
  return rtn;
}

string CommunicatingSocket::getForeignAddress() 
    throw(SocketException) {
  sockaddr_in addr;
  unsigned int addr_len = sizeof(addr);

  if (getpeername(sockDesc, (sockaddr *) &addr,(socklen_t *) &addr_len) < 0) {
    throw SocketException("Fetch of foreign address failed (getpeername())", true);
  }
  return inet_ntoa(addr.sin_addr);
}

unsigned short CommunicatingSocket::getForeignPort() throw(SocketException) {
  sockaddr_in addr;
  unsigned int addr_len = sizeof(addr);

  if (getpeername(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
    throw SocketException("Fetch of foreign port failed (getpeername())", true);
  }
  return ntohs(addr.sin_port);
}

// TCPSocket Code

TCPSocket::TCPSocket() 
    throw(SocketException) : CommunicatingSocket(SOCK_STREAM, 
    IPPROTO_TCP) {
}

TCPSocket::TCPSocket(const string &foreignAddress, unsigned short foreignPort)
    throw(SocketException) : CommunicatingSocket(SOCK_STREAM, IPPROTO_TCP) {
  connect(foreignAddress, foreignPort);
}

TCPSocket::TCPSocket(int newConnSD) : CommunicatingSocket(newConnSD) {
}

// TCPServerSocket Code

TCPServerSocket::TCPServerSocket(unsigned short localPort, int queueLen) 
    throw(SocketException) : Socket(SOCK_STREAM, IPPROTO_TCP) {
  const int opt = 1;
  setSocketOpt(SO_REUSEADDR, &opt, sizeof(opt)); 
  setLocalPort(localPort);
  setListen(queueLen);
}

TCPServerSocket::TCPServerSocket(const string &localAddress, 
    unsigned short localPort, int queueLen) 
    throw(SocketException) : Socket(SOCK_STREAM, IPPROTO_TCP) {
  const int opt = 1;
  setSocketOpt(SO_REUSEADDR, &opt, sizeof(opt)); 
  setLocalAddressAndPort(localAddress, localPort);
  setListen(queueLen);
}

TCPSocket *TCPServerSocket::accept() throw(SocketException) {
  int newConnSD;
  if ((newConnSD = ::accept(sockDesc, NULL, 0)) < 0) {
    throw SocketException("Accept failed (accept())", true);
  }

  return new TCPSocket(newConnSD);
}

void TCPServerSocket::setListen(int queueLen) throw(SocketException) {
  if (listen(sockDesc, queueLen) < 0) {
    throw SocketException("Set listening socket failed (listen())", true);
  }
}

// UDPSocket Code

UDPSocket::UDPSocket() throw(SocketException) : CommunicatingSocket(SOCK_DGRAM,
    IPPROTO_UDP) {
  
  const int opt = 1;
  setSocketOpt(SO_REUSEADDR, &opt, sizeof(opt)); 
  setBroadcast();
}

UDPSocket::UDPSocket(unsigned short localPort)  throw(SocketException) : 
    CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) {
  const int opt = 1;
  setSocketOpt(SO_REUSEADDR, &opt, sizeof(opt)); 
  setLocalPort(localPort);
  setBroadcast();
}

UDPSocket::UDPSocket(const string &localAddress, unsigned short localPort) 
     throw(SocketException) : CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) {
  const int opt = 1;
  setSocketOpt(SO_REUSEADDR, &opt, sizeof(opt)); 
  setLocalAddressAndPort(localAddress, localPort);
  setBroadcast();
}

void UDPSocket::setBroadcast() {
  // If this fails, we'll hear about it when we try to send.  This will allow 
  // system that cannot broadcast to continue if they don't plan to broadcast
  int broadcastPermission = 1;
  setsockopt(sockDesc, SOL_SOCKET, SO_BROADCAST, 
             (raw_type *) &broadcastPermission, sizeof(broadcastPermission));
}

void UDPSocket::disconnect() throw(SocketException) {
  sockaddr_in nullAddr;
  memset(&nullAddr, 0, sizeof(nullAddr));
  nullAddr.sin_family = AF_UNSPEC;

  // Try to disconnect
  if (::connect(sockDesc, (sockaddr *) &nullAddr, sizeof(nullAddr)) < 0) {
   #ifdef WIN32
    if (errno != WSAEAFNOSUPPORT) {
   #else
    if (errno != EAFNOSUPPORT) {
   #endif
      throw SocketException("Disconnect failed (connect())", true);
    }
  }
}

void UDPSocket::sendTo(const void *buffer, int bufferLen, 
    const string &foreignAddress, unsigned short foreignPort) 
    throw(SocketException) {
  sockaddr_in destAddr;
  fillAddr(foreignAddress, foreignPort, destAddr);

  // Write out the whole buffer as a single message.
  if (sendto(sockDesc, (raw_type *) buffer, bufferLen, 0,
             (sockaddr *) &destAddr, sizeof(destAddr)) != bufferLen) {
    throw SocketException("Send failed (sendto())", true);
  }
}

int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress,
    unsigned short &sourcePort) throw(SocketException) {
  sockaddr_in clntAddr;
  socklen_t addrLen = sizeof(clntAddr);
  int rtn;
  if ((rtn = recvfrom(sockDesc, (raw_type *) buffer, bufferLen, 0, 
                      (sockaddr *) &clntAddr, (socklen_t *) &addrLen)) < 0) {
    throw SocketException("Receive failed (recvfrom())", true);
  }
  sourceAddress = inet_ntoa(clntAddr.sin_addr);
  sourcePort = ntohs(clntAddr.sin_port);

  return rtn;
}

int UDPSocket::recvFromNonBlocking(void *buffer, int bufferLen, string &sourceAddress,
    unsigned short &sourcePort, int timeOut) throw(SocketException) {
  sockaddr_in clntAddr;
  socklen_t addrLen = sizeof(clntAddr);
  struct pollfd pfd[1];
  pfd[0].fd = sockDesc;
  pfd[0].events = POLLIN;  
  int rtn = poll(pfd,1,timeOut);
  if(rtn > 0) {
    if ((rtn = recvfrom(sockDesc, (raw_type *) buffer, bufferLen, 0, 
                        (sockaddr *) &clntAddr, (socklen_t *) &addrLen)) < 0) {
      throw SocketException("Receive failed (recvfrom())", true);
    }
    if(!rtn) {
      throw SocketException("connection closed by peer", false);
    }
  }  
  sourceAddress = inet_ntoa(clntAddr.sin_addr);
  sourcePort = ntohs(clntAddr.sin_port);

  return rtn;
}

void UDPSocket::setMulticastTTL(unsigned char multicastTTL) throw(SocketException) {
  if (setsockopt(sockDesc, IPPROTO_IP, IP_MULTICAST_TTL, 
                 (raw_type *) &multicastTTL, sizeof(multicastTTL)) < 0) {
    throw SocketException("Multicast TTL set failed (setsockopt())", true);
  }
}

void UDPSocket::joinGroup(const string &multicastGroup) throw(SocketException) {
  struct ip_mreq multicastRequest;

  multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
  multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
  if (setsockopt(sockDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP, 
                 (raw_type *) &multicastRequest, 
                 sizeof(multicastRequest)) < 0) {
    throw SocketException("Multicast group join failed (setsockopt())", true);
  }
}

void UDPSocket::leaveGroup(const string &multicastGroup) throw(SocketException) {
  struct ip_mreq multicastRequest;

  multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
  multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
  if (setsockopt(sockDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP, 
                 (raw_type *) &multicastRequest, 
                 sizeof(multicastRequest)) < 0) {
    throw SocketException("Multicast group leave failed (setsockopt())", true);
  }
}