summaryrefslogtreecommitdiff
path: root/netsvcs/lib/Client_Logging_Handler.cpp
blob: 9ed9f983aa61a12fd912350bd180c0c75d5ca004 (plain)
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
// $Id$

// Client_Logging_Handler.cpp

#define ACE_BUILD_SVC_DLL
#include "ace/Get_Opt.h"
#include "ace/Acceptor.h"
#include "ace/SOCK_Connector.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/SPIPE_Acceptor.h"
#include "Client_Logging_Handler.h"

ACE_Client_Logging_Handler::ACE_Client_Logging_Handler (ACE_HANDLE output_handle)
  : logging_output_ (output_handle)
{
  // Register ourselves to receive SIGPIPE so we can attempt
  // reconnections.
#if !defined (ACE_LACKS_UNIX_SIGNALS)
  if (ACE_Reactor::instance ()->register_handler (SIGPIPE, this) == -1)
    ACE_ERROR ((LM_ERROR, "%n: %p\n",
		"register_handler (SIGPIPE)"));
#endif /* !ACE_LACKS_UNIX_SIGNALS */
}

// This is called when a <send> to the logging server fails...

int
ACE_Client_Logging_Handler::handle_signal (int, siginfo_t *, ucontext_t *)
{
  ACE_TRACE ("ACE_Client_Logging_Acceptor::handle_signal");
  return -1;
}

// This function is called every time a client connects to us.

int
ACE_Client_Logging_Handler::open (void *)
{
  LOGGING_ADDR server_addr;

  // Register ourselves to receive <handle_input> callbacks when
  // clients send us logging records.  Note that since we're really a
  // Singleton, this->peer() will change after each connect, so we
  // need to grab the value now.
  if (ACE_Reactor::instance ()->register_handler 
      (this->peer ().get_handle (), 
       this,
       ACE_Event_Handler::READ_MASK
       | ACE_Event_Handler::EXCEPT_MASK) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%n: %p\n",
		       "register_handler)"), -1);
  
  // Figure out what remote port we're really bound to.
  if (this->peer ().get_remote_addr (server_addr) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "get_remote_addr"), -1);

  ACE_DEBUG ((LM_DEBUG,
	      "connected to client on handle %u\n",
	      this->peer ().get_handle ()));
  return 0;
}

/* VIRTUAL */ ACE_HANDLE
ACE_Client_Logging_Handler::get_handle (void) const
{
  ACE_TRACE ("ACE_Client_Logging_Handler::get_handle");
  ACE_ERROR ((LM_ERROR,
	      "get_handle() shouldn't be called\n"));
  return ACE_INVALID_HANDLE;
}

// Receive a logging record from an application.

int
ACE_Client_Logging_Handler::handle_input (ACE_HANDLE handle)
{
  ACE_DEBUG ((LM_DEBUG, "in handle_input, handle = %u\n", handle));

  if (handle == this->logging_output_)
    // We're getting a message from the logging server!
    ACE_ERROR_RETURN ((LM_ERROR, "received data from server!\n"), -1);

  ACE_Log_Record log_record;
#if defined (ACE_HAS_STREAM_PIPES)
  // We're getting a logging message from a local application.

  ACE_Str_Buf msg ((void *) &log_record,
		   0,
		   sizeof log_record);

  ACE_SPIPE_Stream spipe;
  spipe.set_handle (handle);
  int flags = 0;

  int result = spipe.recv ((ACE_Str_Buf *) 0, &msg, &flags);

  // We've got a framed IPC mechanism, so we can just to a recv().
  if (result < 0 || msg.len == 0)
    {
      if (ACE_Reactor::instance ()->remove_handler
	  (handle,
	   ACE_Event_Handler::READ_MASK
	   | ACE_Event_Handler::EXCEPT_MASK
	   | ACE_Event_Handler::DONT_CALL) == -1)
	ACE_ERROR_RETURN ((LM_ERROR, "%n: %p\n",
			   "remove_handler"), -1);
      spipe.close ();
      ACE_DEBUG ((LM_DEBUG, "client closing down\n"));
      return 0;
    }
#else
  ACE_INT32 length;

  // We need to use the ol' two-read trick here since TCP sockets
  // don't support framing natively.  Note that the first call is just
  // a "peek" -- we don't actually remove the data until the second
  // call.  Note that this code is portable as long as ACE_UNIT32 is
  // always 32 bits on both the sender and receiver side.

  switch (ACE_OS::recv (handle,
			(char *) &length,
			sizeof length,
			MSG_PEEK))
    {
      // Handle shutdown and error cases.
    default:
    case -1:
    case 0:
      if (ACE_Reactor::instance ()->remove_handler
	  (handle,
	   ACE_Event_Handler::READ_MASK
	   | ACE_Event_Handler::EXCEPT_MASK
	   | ACE_Event_Handler::DONT_CALL) == -1)
	ACE_ERROR_RETURN ((LM_ERROR, "%n: %p\n",
			   "remove_handler"), 0);
      ACE_OS::closesocket (handle);
      ACE_DEBUG ((LM_DEBUG, "client closing down\n"));
      return 0;
      /* NOTREACHED */

    case sizeof length:
      // Process normal data reception.
      if (ACE_OS::recv (handle,
			(char *) &log_record,
			(int) length) != length)
	ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "recv"), 0);
    }
#endif /* ACE_HAS_STREAM_PIPES */

  // Forward the logging record to the server.
  if (this->send (log_record) == -1)
    ACE_ERROR ((LM_ERROR,
		"%p\n",
		"send"));
  return 0;
}

// Receive a logging record from an application send via a non-0
// MSG_BAND...  This just calls handle_input().

int
ACE_Client_Logging_Handler::handle_exception (ACE_HANDLE handle)
{
  return this->handle_input (handle);
}

// Called when object is removed from the ACE_Reactor

int
ACE_Client_Logging_Handler::close (u_long)
{
  ACE_DEBUG ((LM_DEBUG, "shutting down!!!\n"));

  if (this->logging_output_ != ACE_STDOUT)
    ACE_OS::closesocket (this->logging_output_);

  this->destroy ();
  return 0;
}

int
ACE_Client_Logging_Handler::handle_output (ACE_HANDLE)
{
  return 0;
}

// Encodes the contents of log_record object using network byte-order
// and sends it to the logging server.

int
ACE_Client_Logging_Handler::send (ACE_Log_Record &log_record)
{
  if (this->logging_output_ == ACE_STDOUT)
    log_record.print ("<localhost>", 0, stderr);
  else
    {
      long len = log_record.length ();
      log_record.encode ();

      if (ACE::send (this->logging_output_,
		     (char *) &log_record,
		     len) == -1)
	// Switch over to logging to stdout for now.  Eventually,
	// we'll try to queue up the message, try to reestablish a
	// connection, and then send the queued data once we've
	// reconnect to the logging server.
	this->logging_output_ = ACE_STDOUT;
    }

  return 0;
}

class ACE_Client_Logging_Acceptor : public ACE_Acceptor<ACE_Client_Logging_Handler, LOGGING_ACCEPTOR>
  // = TITLE
  //     This factory creates connections with the
  //     <Server_Logging_Acceptor>. 
  //
  // = DESCRIPTION
  //     This class contains the service-specific methods that can't
  //     easily be factored into the <ACE_Acceptor>.
{
public:
  // = Initialization method.
  ACE_Client_Logging_Acceptor (void);
  // Default constructor.

protected:
  // = Dynamic linking hooks.
  virtual int init (int argc, char *argv[]);
  // Called when service is linked.

  virtual int fini (void);
  // Called when service is unlinked.

  virtual int info (char **strp, size_t length) const;
  // Called to determine info about the service.

  virtual int make_svc_handler (ACE_Client_Logging_Handler *&sh);
  // Factory that always returns the <handler_>.

  // = Scheduling hooks.
  virtual int suspend (void);
  virtual int resume (void);

private:
  int parse_args (int argc, char *argv[]);
  // Parse svc.conf arguments.

  const char *server_host_;
  // Host where the logging server is located.

  u_short server_port_;
  // Port number where the logging server is listening for
  // connections.

  ACE_INET_Addr server_addr_;
  // Address of the logging server.

  const char *logger_key_;
  // Communication endpoint where the client logging daemon will
  // listen for connections from clients.

  ACE_Client_Logging_Handler *handler_;
  // Pointer to the handler that does the work.
};

int
ACE_Client_Logging_Acceptor::fini (void)
{
  this->close ();

  if (this->handler_ != 0)
    this->handler_->close (0);
  return 0;
}

int 
ACE_Client_Logging_Acceptor::make_svc_handler (ACE_Client_Logging_Handler *&sh)
{
  // Always return a pointer to the Singleton handler.
  sh = this->handler_;
  return 0;
}

int
ACE_Client_Logging_Acceptor::info (char **strp, size_t length) const
{
  char buf[BUFSIZ];

  ACE_OS::sprintf (buf, "%d/%s %s",
		   this->server_addr_.get_port_number (), "tcp",
		   "# client logging daemon\n");

  if (*strp == 0 && (*strp = ACE_OS::strdup (buf)) == 0)
    return -1;
  else
    ACE_OS::strncpy (*strp, buf, length);
  return ACE_OS::strlen (buf);
}

ACE_Client_Logging_Acceptor::ACE_Client_Logging_Acceptor (void)
  : server_host_ (ACE_DEFAULT_SERVER_HOST),
    server_port_ (ACE_DEFAULT_LOGGING_SERVER_PORT),
    logger_key_ (DEFAULT_LOGGER_KEY),
    handler_ (0)
{
}

int
ACE_Client_Logging_Acceptor::init (int argc, char *argv[])
{
  // We'll log *our* error and debug messages to stderr!
  ACE_LOG_MSG->open ("Client Logging Service");

  // Use the options hook to parse the command line arguments and set
  // options.
  this->parse_args (argc, argv);

  // Initialize the acceptor endpoint.
  if (this->open (LOGGING_ADDR (this->logger_key_)) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", this->logger_key_), -1);

  // Establish connection with the server.
  ACE_SOCK_Connector con;
  ACE_SOCK_Stream stream;

  if (con.connect (stream, this->server_addr_) == -1)
    {
      ACE_ERROR ((LM_ERROR, "%p, using stdout\n",
		  "can't connect to logging server"));
      // If we can't connect to the server then we'll send the logging
      // messages to stdout.
      stream.set_handle (ACE_STDOUT);
    }
  else
    {
      ACE_INET_Addr server_addr;

      // Figure out what remote port we're really bound to.
      if (stream.get_remote_addr (server_addr) == -1)
	ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "get_remote_addr"), -1);

      ACE_DEBUG ((LM_DEBUG,
		  "starting up Client Logging Daemon, "
		  "connected to port %d on handle %u\n",
		  server_addr.get_port_number (),
		  stream.get_handle ()));
    }

  // Create the Singleton <Client_Logging_Handler>.
  ACE_NEW_RETURN (this->handler_,
		  ACE_Client_Logging_Handler (stream.get_handle ()),
		  -1);
  return 0;
}

int
ACE_Client_Logging_Acceptor::parse_args (int argc, char *argv[])
{
  ACE_Get_Opt get_opt (argc, argv, "h:k:p:", 0);

  for (int c; (c = get_opt ()) != -1; )
    {
      switch (c)
	{
	case 'h':
	  this->server_host_ = get_opt.optarg;
	  break;
	case 'k':
	  this->logger_key_ = get_opt.optarg;
	  break;
	case 'p':
	  this->server_port_ = ACE_OS::atoi (get_opt.optarg);
	  break;
	default:
	  ACE_ERROR_RETURN ((LM_ERROR,
			    "%n:\n[-p server-port]\n%a", 1),
			   -1);
	}
    }

  if (this->server_addr_.set (this->server_port_, 
			      this->server_host_) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "set"), -1);

  return 0;
}

int
ACE_Client_Logging_Acceptor::suspend (void)
{
  // To be done...
  return 0;
}

int
ACE_Client_Logging_Acceptor::resume (void)
{
  // To be done...
  return 0;
}

// The following is a "Factory" used by the ACE_Service_Config and
// svc.conf file to dynamically initialize the state of the
// single-threaded logging server.

ACE_SVC_FACTORY_DEFINE (ACE_Client_Logging_Acceptor)

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Acceptor<ACE_Client_Logging_Handler, LOGGING_ACCEPTOR>;
template class ACE_Svc_Handler<LOGGING_STREAM, ACE_NULL_SYNCH>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Acceptor<ACE_Client_Logging_Handler, LOGGING_ACCEPTOR>
#pragma instantiate ACE_Svc_Handler<LOGGING_STREAM, ACE_NULL_SYNCH>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */