summaryrefslogtreecommitdiff
path: root/librpc/rpc/binding.c
blob: 7489073677fd1831d86c3350e83e46106bf10e36 (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
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
/* 
   Unix SMB/CIFS implementation.

   dcerpc utility functions

   Copyright (C) Andrew Tridgell 2003
   Copyright (C) Jelmer Vernooij 2004
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   Copyright (C) Rafal Szczesniak 2006

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "../../lib/util/util_net.h"
#include "librpc/gen_ndr/ndr_epmapper.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/rpc/dcerpc.h"
#undef strcasecmp
#undef strncasecmp

#define MAX_PROTSEQ		10

static const struct {
	const char *name;
	enum dcerpc_transport_t transport;
	int num_protocols;
	enum epm_protocol protseq[MAX_PROTSEQ];
} transports[] = {
	{ "ncacn_np",     NCACN_NP, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }},
	{ "ncacn_ip_tcp", NCACN_IP_TCP, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } }, 
	{ "ncacn_http", NCACN_HTTP, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } }, 
	{ "ncadg_ip_udp", NCACN_IP_UDP, 3, 
		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } },
	{ "ncalrpc", NCALRPC, 2, 
		{ EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_NAMED_PIPE } },
	{ "ncacn_unix_stream", NCACN_UNIX_STREAM, 2, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } },
	{ "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2, 
		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } },
	{ "ncacn_at_dsp", NCACN_AT_DSP, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } },
	{ "ncadg_at_ddp", NCADG_AT_DDP, 3, 
		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } },
	{ "ncacn_vns_ssp", NCACN_VNS_SPP, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } },
	{ "ncacn_vns_ipc", NCACN_VNS_IPC, 3, 
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, },
	{ "ncadg_ipx", NCADG_IPX, 2,
		{ EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX },
	},
	{ "ncacn_spx", NCACN_SPX, 3,
		/* I guess some MS programmer confused the identifier for 
		 * EPM_PROTOCOL_UUID (0x0D or 13) with the one for 
		 * EPM_PROTOCOL_SPX (0x13) here. -- jelmer*/
		{ EPM_PROTOCOL_NCACN, EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_UUID },
	},
};

static const struct {
	const char *name;
	uint32_t flag;
} ncacn_options[] = {
	{"sign", DCERPC_SIGN},
	{"seal", DCERPC_SEAL},
	{"connect", DCERPC_CONNECT},
	{"spnego", DCERPC_AUTH_SPNEGO},
	{"ntlm", DCERPC_AUTH_NTLM},
	{"krb5", DCERPC_AUTH_KRB5},
	{"validate", DCERPC_DEBUG_VALIDATE_BOTH},
	{"print", DCERPC_DEBUG_PRINT_BOTH},
	{"padcheck", DCERPC_DEBUG_PAD_CHECK},
	{"bigendian", DCERPC_PUSH_BIGENDIAN},
	{"smb2", DCERPC_SMB2},
	{"hdrsign", DCERPC_HEADER_SIGNING},
	{"ndr64", DCERPC_NDR64},
	{"localaddress", DCERPC_LOCALADDRESS}
};

const char *epm_floor_string(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
{
	struct ndr_syntax_id syntax;
	NTSTATUS status;

	switch(epm_floor->lhs.protocol) {
		case EPM_PROTOCOL_UUID:
			status = dcerpc_floor_get_lhs_data(epm_floor, &syntax);
			if (NT_STATUS_IS_OK(status)) {
				/* lhs is used: UUID */
				char *uuidstr;

				if (GUID_equal(&syntax.uuid, &ndr_transfer_syntax.uuid)) {
					return "NDR";
				} 

				if (GUID_equal(&syntax.uuid, &ndr64_transfer_syntax.uuid)) {
					return "NDR64";
				} 

				uuidstr = GUID_string(mem_ctx, &syntax.uuid);

				return talloc_asprintf(mem_ctx, " uuid %s/0x%02x", uuidstr, syntax.if_version);
			} else { /* IPX */
				return talloc_asprintf(mem_ctx, "IPX:%s", 
						data_blob_hex_string_upper(mem_ctx, &epm_floor->rhs.uuid.unknown));
			}

		case EPM_PROTOCOL_NCACN:
			return "RPC-C";

		case EPM_PROTOCOL_NCADG:
			return "RPC";

		case EPM_PROTOCOL_NCALRPC:
			return "NCALRPC";

		case EPM_PROTOCOL_DNET_NSP:
			return "DNET/NSP";

		case EPM_PROTOCOL_IP:
			return talloc_asprintf(mem_ctx, "IP:%s", epm_floor->rhs.ip.ipaddr);

		case EPM_PROTOCOL_NAMED_PIPE:
			return talloc_asprintf(mem_ctx, "NAMED-PIPE:%s", epm_floor->rhs.named_pipe.path);

		case EPM_PROTOCOL_SMB:
			return talloc_asprintf(mem_ctx, "SMB:%s", epm_floor->rhs.smb.unc);

		case EPM_PROTOCOL_UNIX_DS:
			return talloc_asprintf(mem_ctx, "Unix:%s", epm_floor->rhs.unix_ds.path);

		case EPM_PROTOCOL_NETBIOS:
			return talloc_asprintf(mem_ctx, "NetBIOS:%s", epm_floor->rhs.netbios.name);

		case EPM_PROTOCOL_NETBEUI:
			return "NETBeui";

		case EPM_PROTOCOL_SPX:
			return "SPX";

		case EPM_PROTOCOL_NB_IPX:
			return "NB_IPX";

		case EPM_PROTOCOL_HTTP:
			return talloc_asprintf(mem_ctx, "HTTP:%d", epm_floor->rhs.http.port);

		case EPM_PROTOCOL_TCP:
			return talloc_asprintf(mem_ctx, "TCP:%d", epm_floor->rhs.tcp.port);

		case EPM_PROTOCOL_UDP:
			return talloc_asprintf(mem_ctx, "UDP:%d", epm_floor->rhs.udp.port);

		default:
			return talloc_asprintf(mem_ctx, "UNK(%02x):", epm_floor->lhs.protocol);
	}
}


/*
  form a binding string from a binding structure
*/
_PUBLIC_ char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b)
{
	char *s = talloc_strdup(mem_ctx, "");
	int i;
	const char *t_name = NULL;

	if (b->transport != NCA_UNKNOWN) {
		t_name = derpc_transport_string_by_transport(b->transport);
		if (!t_name) {
			return NULL;
		}
	}

	if (!GUID_all_zero(&b->object.uuid)) { 
		s = talloc_asprintf(s, "%s@",
				    GUID_string(mem_ctx, &b->object.uuid));
	}

	if (t_name != NULL) {
		s = talloc_asprintf_append_buffer(s, "%s:", t_name);
		if (s == NULL) {
			return NULL;
		}
	}

	if (b->host) {
		s = talloc_asprintf_append_buffer(s, "%s", b->host);
	}

	if (!b->endpoint && !b->options && !b->flags) {
		return s;
	}

	s = talloc_asprintf_append_buffer(s, "[");

	if (b->endpoint) {
		s = talloc_asprintf_append_buffer(s, "%s", b->endpoint);
	}

	/* this is a *really* inefficent way of dealing with strings,
	   but this is rarely called and the strings are always short,
	   so I don't care */
	for (i=0;b->options && b->options[i];i++) {
		s = talloc_asprintf_append_buffer(s, ",%s", b->options[i]);
		if (!s) return NULL;
	}

	for (i=0;i<ARRAY_SIZE(ncacn_options);i++) {
		if (b->flags & ncacn_options[i].flag) {
			if (ncacn_options[i].flag == DCERPC_LOCALADDRESS && b->localaddress) {
				s = talloc_asprintf_append_buffer(s, ",%s=%s", ncacn_options[i].name,
								  b->localaddress);
			} else {
				s = talloc_asprintf_append_buffer(s, ",%s", ncacn_options[i].name);
			}
			if (!s) return NULL;
		}
	}

	s = talloc_asprintf_append_buffer(s, "]");

	return s;
}

/*
  parse a binding string into a dcerpc_binding structure
*/
_PUBLIC_ NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *s, struct dcerpc_binding **b_out)
{
	struct dcerpc_binding *b;
	char *options;
	char *p;
	int i, j, comma_count;

	b = talloc_zero(mem_ctx, struct dcerpc_binding);
	if (!b) {
		return NT_STATUS_NO_MEMORY;
	}

	p = strchr(s, '@');

	if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */
		NTSTATUS status;
		DATA_BLOB blob = data_blob(s, 36);
		status = GUID_from_data_blob(&blob, &b->object.uuid);

		if (NT_STATUS_IS_ERR(status)) {
			DEBUG(0, ("Failed parsing UUID\n"));
			return status;
		}

		s = p + 1;
	} else {
		ZERO_STRUCT(b->object);
	}

	b->object.if_version = 0;

	p = strchr(s, ':');

	if (p == NULL) {
		b->transport = NCA_UNKNOWN;
	} else {
		char *type = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
		if (!type) {
			return NT_STATUS_NO_MEMORY;
		}

		for (i=0;i<ARRAY_SIZE(transports);i++) {
			if (strcasecmp(type, transports[i].name) == 0) {
				b->transport = transports[i].transport;
				break;
			}
		}

		if (i==ARRAY_SIZE(transports)) {
			DEBUG(0,("Unknown dcerpc transport '%s'\n", type));
			return NT_STATUS_INVALID_PARAMETER;
		}

		talloc_free(type);

		s = p+1;
	}

	p = strchr(s, '[');
	if (p) {
		b->host = talloc_strndup(b, s, PTR_DIFF(p, s));
		options = talloc_strdup(mem_ctx, p+1);
		if (options[strlen(options)-1] != ']') {
			return NT_STATUS_INVALID_PARAMETER;
		}
		options[strlen(options)-1] = 0;
	} else {
		b->host = talloc_strdup(b, s);
		options = NULL;
	}
	if (!b->host) {
		return NT_STATUS_NO_MEMORY;
	}

	b->target_hostname = b->host;

	b->options = NULL;
	b->flags = 0;
	b->assoc_group_id = 0;
	b->endpoint = NULL;
	b->localaddress = NULL;

	if (!options) {
		*b_out = b;
		return NT_STATUS_OK;
	}

	comma_count = count_chars(options, ',');

	b->options = talloc_array(b, const char *, comma_count+2);
	if (!b->options) {
		return NT_STATUS_NO_MEMORY;
	}

	for (i=0; (p = strchr(options, ',')); i++) {
		b->options[i] = talloc_strndup(b, options, PTR_DIFF(p, options));
		if (!b->options[i]) {
			return NT_STATUS_NO_MEMORY;
		}
		options = p+1;
	}
	b->options[i] = options;
	b->options[i+1] = NULL;

	/* some options are pre-parsed for convenience */
	for (i=0;b->options[i];i++) {
		for (j=0;j<ARRAY_SIZE(ncacn_options);j++) {
			size_t opt_len = strlen(ncacn_options[j].name);
			if (strncasecmp(ncacn_options[j].name, b->options[i], opt_len) == 0) {
				int k;
				char c = b->options[i][opt_len];

				if (ncacn_options[j].flag == DCERPC_LOCALADDRESS && c == '=') {
					b->localaddress = talloc_strdup(b, &b->options[i][opt_len+1]);
				} else if (c != 0) {
					continue;
				}

				b->flags |= ncacn_options[j].flag;
				for (k=i;b->options[k];k++) {
					b->options[k] = b->options[k+1];
				}
				i--;
				break;
			}
		}
	}

	if (b->options[0]) {
		/* Endpoint is first option */
		b->endpoint = b->options[0];
		if (strlen(b->endpoint) == 0) b->endpoint = NULL;

		for (i=0;b->options[i];i++) {
			b->options[i] = b->options[i+1];
		}
	}

	if (b->options[0] == NULL)
		b->options = NULL;

	*b_out = b;
	return NT_STATUS_OK;
}

_PUBLIC_ NTSTATUS dcerpc_floor_get_lhs_data(const struct epm_floor *epm_floor,
					    struct ndr_syntax_id *syntax)
{
	TALLOC_CTX *mem_ctx = talloc_init("floor_get_lhs_data");
	struct ndr_pull *ndr;
	enum ndr_err_code ndr_err;
	uint16_t if_version=0;

	ndr = ndr_pull_init_blob(&epm_floor->lhs.lhs_data, mem_ctx);
	if (ndr == NULL) {
		talloc_free(mem_ctx);
		return NT_STATUS_NO_MEMORY;
	}
	ndr->flags |= LIBNDR_FLAG_NOALIGN;

	ndr_err = ndr_pull_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		talloc_free(mem_ctx);
		return ndr_map_error2ntstatus(ndr_err);
	}

	ndr_err = ndr_pull_uint16(ndr, NDR_SCALARS, &if_version);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		talloc_free(mem_ctx);
		return ndr_map_error2ntstatus(ndr_err);
	}

	syntax->if_version = if_version;

	talloc_free(mem_ctx);

	return NT_STATUS_OK;
}

static DATA_BLOB dcerpc_floor_pack_lhs_data(TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax)
{
	DATA_BLOB blob;
	struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx);

	ndr->flags |= LIBNDR_FLAG_NOALIGN;

	ndr_push_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid);
	ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version);

	blob = ndr_push_blob(ndr);
	talloc_steal(mem_ctx, blob.data);
	talloc_free(ndr);
	return blob;
}

static DATA_BLOB dcerpc_floor_pack_rhs_if_version_data(TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax)
{
	DATA_BLOB blob;
	struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx);

	ndr->flags |= LIBNDR_FLAG_NOALIGN;

	ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version >> 16);

	blob = ndr_push_blob(ndr);
	talloc_steal(mem_ctx, blob.data);
	talloc_free(ndr);
	return blob;
}

const char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
{
	switch (epm_floor->lhs.protocol) {
	case EPM_PROTOCOL_TCP:
		if (epm_floor->rhs.tcp.port == 0) return NULL;
		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.tcp.port);

	case EPM_PROTOCOL_UDP:
		if (epm_floor->rhs.udp.port == 0) return NULL;
		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.udp.port);

	case EPM_PROTOCOL_HTTP:
		if (epm_floor->rhs.http.port == 0) return NULL;
		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.http.port);

	case EPM_PROTOCOL_IP:
		return talloc_strdup(mem_ctx, epm_floor->rhs.ip.ipaddr);

	case EPM_PROTOCOL_NCACN:
		return NULL;

	case EPM_PROTOCOL_NCADG:
		return NULL;

	case EPM_PROTOCOL_SMB:
		if (strlen(epm_floor->rhs.smb.unc) == 0) return NULL;
		return talloc_strdup(mem_ctx, epm_floor->rhs.smb.unc);

	case EPM_PROTOCOL_NAMED_PIPE:
		if (strlen(epm_floor->rhs.named_pipe.path) == 0) return NULL;
		return talloc_strdup(mem_ctx, epm_floor->rhs.named_pipe.path);

	case EPM_PROTOCOL_NETBIOS:
		if (strlen(epm_floor->rhs.netbios.name) == 0) return NULL;
		return talloc_strdup(mem_ctx, epm_floor->rhs.netbios.name);

	case EPM_PROTOCOL_NCALRPC:
		return NULL;

	case EPM_PROTOCOL_VINES_SPP:
		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_spp.port);

	case EPM_PROTOCOL_VINES_IPC:
		return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_ipc.port);

	case EPM_PROTOCOL_STREETTALK:
		return talloc_strdup(mem_ctx, epm_floor->rhs.streettalk.streettalk);

	case EPM_PROTOCOL_UNIX_DS:
		if (strlen(epm_floor->rhs.unix_ds.path) == 0) return NULL;
		return talloc_strdup(mem_ctx, epm_floor->rhs.unix_ds.path);

	case EPM_PROTOCOL_NULL:
		return NULL;

	default:
		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
		break;
	}

	return NULL;
}

static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, 
					  struct epm_floor *epm_floor,  
					  const char *data)
{
	switch (epm_floor->lhs.protocol) {
	case EPM_PROTOCOL_TCP:
		epm_floor->rhs.tcp.port = atoi(data);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_UDP:
		epm_floor->rhs.udp.port = atoi(data);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_HTTP:
		epm_floor->rhs.http.port = atoi(data);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_IP:
		epm_floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.ip.ipaddr);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NCACN:
		epm_floor->rhs.ncacn.minor_version = 0;
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NCADG:
		epm_floor->rhs.ncadg.minor_version = 0;
		return NT_STATUS_OK;

	case EPM_PROTOCOL_SMB:
		epm_floor->rhs.smb.unc = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.smb.unc);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NAMED_PIPE:
		epm_floor->rhs.named_pipe.path = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.named_pipe.path);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NETBIOS:
		epm_floor->rhs.netbios.name = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.netbios.name);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NCALRPC:
		return NT_STATUS_OK;

	case EPM_PROTOCOL_VINES_SPP:
		epm_floor->rhs.vines_spp.port = atoi(data);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_VINES_IPC:
		epm_floor->rhs.vines_ipc.port = atoi(data);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_STREETTALK:
		epm_floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.streettalk.streettalk);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_UNIX_DS:
		epm_floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data);
		NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.unix_ds.path);
		return NT_STATUS_OK;

	case EPM_PROTOCOL_NULL:
		return NT_STATUS_OK;

	default:
		DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
		break;
	}

	return NT_STATUS_NOT_SUPPORTED;
}

enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot)
{
	int i;

	/* Find a transport that has 'prot' as 4th protocol */
	for (i=0;i<ARRAY_SIZE(transports);i++) {
		if (transports[i].num_protocols >= 2 && 
			transports[i].protseq[1] == prot) {
			return transports[i].transport;
		}
	}

	/* Unknown transport */
	return (unsigned int)-1;
}

_PUBLIC_ enum dcerpc_transport_t dcerpc_transport_by_tower(const struct epm_tower *tower)
{
	int i;

	/* Find a transport that matches this tower */
	for (i=0;i<ARRAY_SIZE(transports);i++) {
		int j;
		if (transports[i].num_protocols != tower->num_floors - 2) {
			continue; 
		}

		for (j = 0; j < transports[i].num_protocols; j++) {
			if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) {
				break;
			}
		}

		if (j == transports[i].num_protocols) {
			return transports[i].transport;
		}
	}

	/* Unknown transport */
	return (unsigned int)-1;
}

_PUBLIC_ const char *derpc_transport_string_by_transport(enum dcerpc_transport_t t)
{
	int i;

	for (i=0; i<ARRAY_SIZE(transports); i++) {
		if (t == transports[i].transport) {
			return transports[i].name;
		}
	}
	return NULL;
}

_PUBLIC_ NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, 
				   struct epm_tower *tower, 
				   struct dcerpc_binding **b_out)
{
	NTSTATUS status;
	struct dcerpc_binding *binding;

	binding = talloc_zero(mem_ctx, struct dcerpc_binding);
	NT_STATUS_HAVE_NO_MEMORY(binding);

	ZERO_STRUCT(binding->object);
	binding->options = NULL;
	binding->host = NULL;
	binding->target_hostname = NULL;
	binding->flags = 0;
	binding->assoc_group_id = 0;

	binding->transport = dcerpc_transport_by_tower(tower);

	if (binding->transport == (unsigned int)-1) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	if (tower->num_floors < 1) {
		return NT_STATUS_OK;
	}

	/* Set object uuid */
	status = dcerpc_floor_get_lhs_data(&tower->floors[0], &binding->object);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Error pulling object uuid and version: %s", nt_errstr(status)));	
		return status;
	}

	/* Ignore floor 1, it contains the NDR version info */

	binding->options = NULL;

	/* Set endpoint */
	if (tower->num_floors >= 4) {
		binding->endpoint = dcerpc_floor_get_rhs_data(binding, &tower->floors[3]);
	} else {
		binding->endpoint = NULL;
	}

	/* Set network address */
	if (tower->num_floors >= 5) {
		binding->host = dcerpc_floor_get_rhs_data(binding, &tower->floors[4]);
		NT_STATUS_HAVE_NO_MEMORY(binding->host);
		binding->target_hostname = binding->host;
	}
	*b_out = binding;
	return NT_STATUS_OK;
}

_PUBLIC_ NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx,
					     const struct dcerpc_binding *binding,
					     struct epm_tower *tower)
{
	const enum epm_protocol *protseq = NULL;
	int num_protocols = -1, i;
	NTSTATUS status;

	/* Find transport */
	for (i=0;i<ARRAY_SIZE(transports);i++) {
		if (transports[i].transport == binding->transport) {
			protseq = transports[i].protseq;
			num_protocols = transports[i].num_protocols;
			break;
		}
	}

	if (num_protocols == -1) {
		DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport));
		return NT_STATUS_UNSUCCESSFUL;
	}

	tower->num_floors = 2 + num_protocols;
	tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors);

	/* Floor 0 */
	tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;

	tower->floors[0].lhs.lhs_data = dcerpc_floor_pack_lhs_data(tower->floors, &binding->object);

	tower->floors[0].rhs.uuid.unknown = dcerpc_floor_pack_rhs_if_version_data(tower->floors, &binding->object);

	/* Floor 1 */
	tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;

	tower->floors[1].lhs.lhs_data = dcerpc_floor_pack_lhs_data(tower->floors, 
								&ndr_transfer_syntax);

	tower->floors[1].rhs.uuid.unknown = data_blob_talloc_zero(tower->floors, 2);

	/* Floor 2 to num_protocols */
	for (i = 0; i < num_protocols; i++) {
		tower->floors[2 + i].lhs.protocol = protseq[i];
		tower->floors[2 + i].lhs.lhs_data = data_blob_talloc(tower->floors, NULL, 0);
		ZERO_STRUCT(tower->floors[2 + i].rhs);
		dcerpc_floor_set_rhs_data(tower->floors, &tower->floors[2 + i], "");
	}

	/* The 4th floor contains the endpoint */
	if (num_protocols >= 2 && binding->endpoint) {
		status = dcerpc_floor_set_rhs_data(tower->floors, &tower->floors[3], binding->endpoint);
		if (NT_STATUS_IS_ERR(status)) {
			return status;
		}
	}

	/* The 5th contains the network address */
	if (num_protocols >= 3 && binding->host) {
		if (is_ipaddress(binding->host)) {
			status = dcerpc_floor_set_rhs_data(tower->floors, &tower->floors[4], 
							   binding->host);
		} else {
			/* note that we don't attempt to resolve the
			   name here - when we get a hostname here we
			   are in the client code, and want to put in
			   a wildcard all-zeros IP for the server to
			   fill in */
			status = dcerpc_floor_set_rhs_data(tower->floors, &tower->floors[4], 
							   "0.0.0.0");
		}
		if (NT_STATUS_IS_ERR(status)) {
			return status;
		}
	}

	return NT_STATUS_OK;
}