summaryrefslogtreecommitdiff
path: root/src/transport/plugin_transport_http_common.c
blob: de4cb9a26e97c29022fedf001da1739746e29fe0 (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
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
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
/*
     This file is part of GNUnet
     (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)

     GNUnet 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 3, or (at your
     option) any later version.

     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file transport/plugin_transport_http_common.c
 * @brief functionality shared by http client and server transport service plugin
 * @author Matthias Wachs
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_transport_plugin.h"
#include "plugin_transport_http_common.h"

struct SplittedHTTPAddress
{
	char *protocol;
	char *host;
	char *path;
	int port;
};


static void
http_clean_splitted (struct SplittedHTTPAddress *spa)
{
  if (NULL != spa)
  {
    GNUNET_free_non_null (spa->protocol);
    GNUNET_free_non_null (spa->host);
    GNUNET_free_non_null (spa->path);
    GNUNET_free_non_null (spa);
  }
}

struct SplittedHTTPAddress *
http_split_address (const char * addr)
{
	struct SplittedHTTPAddress  *sp;
	char *src = GNUNET_strdup (addr);
	char *protocol_start = NULL;
	char *host_start = NULL;
	char *v6_end = NULL;
	char *port_start = NULL;
	char *path_start = NULL;
	protocol_start = src;
	sp = GNUNET_malloc (sizeof (struct SplittedHTTPAddress));

	/* Address string consists of protocol://host[:port]path*/

	host_start = strstr (src, "://");
	if (NULL == host_start)
	{
			GNUNET_free (src);
			GNUNET_free (sp);
			return NULL;
	}

	host_start[0] = '\0';
	sp->protocol = GNUNET_strdup (protocol_start);

	host_start += strlen ("://");
	if (strlen (host_start) == 0)
	{
			GNUNET_free (src);
			GNUNET_free (sp->protocol);
			GNUNET_free (sp);
			return NULL;
	}

	/* Find path start */
	path_start = strchr (host_start, '/');
	if (NULL != path_start)
	{
			sp->path = GNUNET_strdup (path_start);
			path_start[0] = '\0';
	}
	else
		sp->path = GNUNET_strdup ("");

	if (strlen(host_start) < 1)
	{
			GNUNET_free (src);
			GNUNET_free (sp->protocol);
			GNUNET_free (sp->path);
			GNUNET_free (sp);
			return NULL;
	}

	if (NULL != (port_start = strrchr (host_start, ':')))
	{
			/* *We COULD have a port, but also an IPv6 address! */
			if (NULL != (v6_end = strchr(host_start, ']')))
			{
					if  (v6_end < port_start)
					{
							/* IPv6 address + port */
							port_start[0] = '\0';
							port_start ++;
							sp->port = atoi (port_start);
							if ((0 == sp->port) || (65535 < sp->port))
							{
								GNUNET_free (src);
								GNUNET_free (sp->protocol);
								GNUNET_free (sp->path);
								GNUNET_free (sp);
								return NULL;
							}
					}
					else
					{
							/* IPv6 address + no port */
							if (0 == strcmp(sp->protocol, "https"))
								sp->port = HTTPS_DEFAULT_PORT;
							else if (0 == strcmp(sp->protocol, "http"))
								sp->port = HTTP_DEFAULT_PORT;
					}
			}
			else
			{
					/* No IPv6 address */
					port_start[0] = '\0';
					port_start ++;
					sp->port = atoi (port_start);
					if ((0 == sp->port) || (65535 < sp->port))
					{
						GNUNET_free (src);
						GNUNET_free (sp->protocol);
						GNUNET_free (sp->path);
						GNUNET_free (sp);
						return NULL;
					}
			}
	}
	else
	{
		/* No ':' as port separator, default port for protocol */
		if (0 == strcmp(sp->protocol, "https"))
			sp->port = HTTPS_DEFAULT_PORT;
		else if (0 == strcmp(sp->protocol, "http"))
			sp->port = HTTP_DEFAULT_PORT;
		else
		{
				GNUNET_break (0);
				GNUNET_free (src);
				GNUNET_free (sp->protocol);
				GNUNET_free (sp->path);
				GNUNET_free (sp);
				return NULL;
		}
	}
	if (strlen (host_start) > 0)
			sp->host = GNUNET_strdup (host_start);
	else
	{
			GNUNET_break (0);
			GNUNET_free (src);
			GNUNET_free (sp->protocol);
			GNUNET_free (sp->path);
			GNUNET_free (sp);
			return NULL;
	}
	GNUNET_free (src);
	return sp;
}

/**
 * Convert the transports address to a nice, human-readable
 * format.
 *
 * @param cls closure
 * @param type name of the transport that generated the address
 * @param addr one of the addresses of the host, NULL for the last address
 *        the specific address format depends on the transport
 * @param addrlen length of the address
 * @param numeric should (IP) addresses be displayed in numeric form?
 * @param timeout after how long should we give up?
 * @param asc function to call on each string
 * @param asc_cls closure for asc
 */
void
http_common_plugin_address_pretty_printer (void *cls, const char *type,
                                        const void *addr, size_t addrlen,
                                        int numeric,
                                        struct GNUNET_TIME_Relative timeout,
                                        GNUNET_TRANSPORT_AddressStringCallback
                                        asc, void *asc_cls)
{
	const struct HttpAddress *address = addr;

  if (NULL == http_common_plugin_address_to_string (NULL, (char *) type, address, addrlen))
  {
      asc (asc_cls, NULL);
      return;
  }
  asc (asc_cls, http_common_plugin_address_to_string (NULL, (char *) type, address, addrlen));
  asc (asc_cls, NULL);
}

const char *
http_common_plugin_address_to_url (void *cls, const void *addr, size_t addrlen)
{
  static char rbuf[1024];
	const struct HttpAddress *address = addr;
  const char * addr_str;



  if (NULL == addr)
  {
  	GNUNET_break (0);
    return NULL;
  }
  if (0 >= addrlen)
  {
  	GNUNET_break (0);
    return NULL;
  }
  if (addrlen != http_common_address_get_size (address))
  {
  	GNUNET_break (0);
    return NULL;
  }
  addr_str = (char *) &address[1];

  if (addr_str[ntohl(address->urlen) -1] != '\0')
    return NULL;

  memcpy (rbuf, &address[1], ntohl(address->urlen));
  return rbuf;
}

/**
 * Function called for a quick conversion of the binary address to
 * a numeric address.  Note that the caller must not free the
 * address and that the next call to this function is allowed
 * to override the address again.
 *
 * @param cls closure
 * @param plugin the plugin
 * @param addr binary address
 * @param addrlen length of the address
 * @return string representing the same address
 */
const char *
http_common_plugin_address_to_string (void *cls, char *plugin, const void *addr, size_t addrlen)
{
  static char rbuf[1024];
	const struct HttpAddress *address = addr;
  const char * addr_str;
  char *res;

  GNUNET_assert (NULL != plugin);

  if (NULL == addr)
      return NULL;
  if (0 == addrlen)
    return TRANSPORT_SESSION_INBOUND_STRING;
  if (addrlen != http_common_address_get_size (address))
  	return NULL;
  addr_str = (char *) &address[1];

  if (addr_str[ntohl(address->urlen) -1] != '\0')
    return NULL;
  GNUNET_asprintf (&res, "%s.%u.%s", plugin, ntohl(address->options), &address[1]);
  if (strlen(res) + 1 < 500)
  {
  	memcpy (rbuf, res, strlen(res) + 1);
  	GNUNET_free (res);
  	return rbuf;
  }
  GNUNET_break (0);
	GNUNET_free (res);
	return NULL;
}

/**
 * Function called to convert a string address to
 * a binary address.
 *
 * @param cls closure ('struct Plugin*')
 * @param addr string address
 * @param addrlen length of the address
 * @param buf location to store the buffer
 *        If the function returns GNUNET_SYSERR, its contents are undefined.
 * @param added length of created address
 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
 */
int
http_common_plugin_string_to_address (void *cls,
                        const char *addr,
                        uint16_t addrlen,
                        void **buf,
                        size_t *added)
{
	struct HttpAddress *a;
  char *address;
  char *plugin;
  char *optionstr;
  size_t urlen;
  uint32_t options;

  /* Format protocol.options.address:port */
  address = NULL;
  plugin = NULL;
  optionstr = NULL;
  if ((NULL == addr) || (addrlen == 0))
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if ('\0' != addr[addrlen - 1])
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  if (strlen (addr) != addrlen - 1)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  plugin = GNUNET_strdup (addr);
  optionstr = strchr (plugin, '.');
  if (NULL == optionstr)
  {
    GNUNET_break (0);
    GNUNET_free (plugin);
    return GNUNET_SYSERR;
  }
  optionstr[0] = '\0';
  optionstr ++;
  options = atol (optionstr); /* 0 on conversion error, that's ok */
  address = strchr (optionstr, '.');
  if (NULL == address)
  {
    GNUNET_break (0);
    GNUNET_free (plugin);
    return GNUNET_SYSERR;
  }
  address[0] = '\0';
  address ++;
  urlen = strlen (address) + 1;

  a = GNUNET_malloc (sizeof (struct HttpAddress) + urlen);
  a->options = htonl(options);
  a->urlen = htonl(urlen);
  memcpy (&a[1], address, urlen);

  (*buf) = a;
  (*added) = sizeof (struct HttpAddress) + urlen;
  GNUNET_free (plugin);
  return GNUNET_OK;
}

/**
 * Create a HTTP address from a socketaddr
 *
 * @param protocol protocol
 * @param addr sockaddr * address
 * @param addrlen length of the address
 * @return the HttpAddress
 */
struct HttpAddress *
http_common_address_from_socket (const char *protocol, const struct sockaddr *addr, socklen_t addrlen)
{
  struct HttpAddress *address = NULL;
  char *res;
  size_t len;

  GNUNET_asprintf(&res, "%s://%s", protocol, GNUNET_a2s (addr, addrlen));
  len = strlen (res)+1;

  address = GNUNET_malloc (sizeof (struct HttpAddress) + len);
  address->options = htonl (HTTP_OPTIONS_NONE);
  address->urlen = htonl (len);
  memcpy (&address[1], res, len);
  GNUNET_free (res);

  return address;
}

/**
 * Create a socketaddr from a HTTP address
 *
 * @param addr sockaddr * address
 * @param addrlen length of the address
 * @param res the result:
 * GNUNET_SYSERR, invalid input,
 * GNUNET_YES: could convert to ip,
 * GNUNET_NO: valid input but could not convert to ip (hostname?)
 * @return the string
 */
struct sockaddr *
http_common_socket_from_address (const void *addr, size_t addrlen, int *res)
{
	const struct HttpAddress *ha;
	struct SplittedHTTPAddress * spa;
  struct sockaddr_storage *s;
  (*res) = GNUNET_SYSERR;
  char * to_conv;
  size_t urlen;

  ha = (const struct HttpAddress *) addr;
  if (NULL == addr)
  {
    GNUNET_break(0);
    return NULL ;
  }
  if (0 >= addrlen)
  {
    GNUNET_break(0);
    return NULL ;
  }
  if (addrlen < sizeof(struct HttpAddress))
  {
    GNUNET_break(0);
    return NULL ;
  }
  urlen = ntohl (ha->urlen);
  if (sizeof(struct HttpAddress) + urlen != addrlen)
  {
    /* This is a legacy addresses */
    return NULL ;
  }
  if (addrlen < sizeof(struct HttpAddress) + urlen)
  {
    /* This is a legacy addresses */
    return NULL ;
  }
  if (((char *) addr)[addrlen - 1] != '\0')
  {
    GNUNET_break(0);
    return NULL ;
  }
  spa = http_split_address ((const char *) &ha[1]);
  if (NULL == spa)
  {
      (*res) = GNUNET_SYSERR;
      return NULL;
  }

  s = GNUNET_malloc (sizeof (struct sockaddr_storage));
  GNUNET_asprintf (&to_conv, "%s:%u", spa->host, spa->port);
  if (GNUNET_SYSERR == GNUNET_STRINGS_to_address_ip (to_conv, strlen(to_conv), s))
  {
    /* could be a hostname */
  	GNUNET_free (s);
    (*res) = GNUNET_NO;
    s = NULL;
  }
  else if ((AF_INET != s->ss_family) && (AF_INET6 != s->ss_family))
  {

		GNUNET_free (s);
		(*res) = GNUNET_SYSERR;
		s = NULL;
  }
  else
  {
  		(*res) = GNUNET_YES;
  }
	http_clean_splitted (spa);
  GNUNET_free (to_conv);
  return (struct sockaddr *) s;
}

/**
 * Get the length of an address
 *
 * @param addr address
 * @return the size
 */
size_t
http_common_address_get_size (const struct HttpAddress * addr)
{
 return sizeof (struct HttpAddress) + ntohl(addr->urlen);
}

/**
 * Compare addr1 to addr2
 *
 * @param addr1 address1
 * @param addrlen1 address 1 length
 * @param addr2 address2
 * @param addrlen2 address 2 length
 * @return GNUNET_YES if equal, GNUNET_NO if not, GNUNET_SYSERR on error
 */
size_t
http_common_cmp_addresses (const void *addr1, size_t addrlen1, const void *addr2, size_t addrlen2)
{
	const struct HttpAddress *ha1;
	const struct HttpAddress *ha2;
  const char *a1 = (const char *) addr1;
  const char *a2 = (const char *) addr2;
  ha1 = (const struct HttpAddress *) a1;
  ha2 = (const struct HttpAddress *) a2;

  if (NULL == a1)
      return GNUNET_SYSERR;
  if (0 >= addrlen1)
    return GNUNET_SYSERR;
  if (a1[addrlen1-1] != '\0')
    return GNUNET_SYSERR;

  if (NULL == a2)
      return GNUNET_SYSERR;
  if (0 >= addrlen2)
    return GNUNET_SYSERR;
  if (a2[addrlen2-1] != '\0')
    return GNUNET_SYSERR;

  if (addrlen1 != addrlen2)
    return GNUNET_NO;
  if (ha1->urlen != ha2->urlen)
    return GNUNET_NO;

  if (0 == strcmp ((const char *) &ha1[1],(const char *) &ha2[1]))
    return GNUNET_YES;
  return GNUNET_NO;
}



/* end of plugin_transport_http_common.c */