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librpc/ndr: make ndr_push_relative_ptr2() static
[Samba/cd1.git] / librpc / ndr / ndr.c
blob90ecdb158405a7c05d6c4e6cc7ba1adca2ba1d85
1 /*
2 Unix SMB/CIFS implementation.
3
4 libndr interface
5
6 Copyright (C) Andrew Tridgell 2003
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 /*
23 this provides the core routines for NDR parsing functions
24
25 see http://www.opengroup.org/onlinepubs/9629399/chap14.htm for details
26 of NDR encoding rules
27 */
28
29 #include "includes.h"
30 #include "librpc/ndr/libndr.h"
31 #include "../lib/util/dlinklist.h"
32 #if _SAMBA_BUILD_ == 4
33 #include "param/param.h"
34 #endif
35
36 #define NDR_BASE_MARSHALL_SIZE 1024
37
38 /* this guid indicates NDR encoding in a protocol tower */
39 const struct ndr_syntax_id ndr_transfer_syntax = {
40 { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} },
41 2
42 };
43
44 const struct ndr_syntax_id ndr64_transfer_syntax = {
45 { 0x71710533, 0xbeba, 0x4937, {0x83, 0x19}, {0xb5,0xdb,0xef,0x9c,0xcc,0x36} },
46 1
47 };
48
49 /*
50 work out the number of bytes needed to align on a n byte boundary
51 */
52 _PUBLIC_ size_t ndr_align_size(uint32_t offset, size_t n)
53 {
54 if ((offset & (n-1)) == 0) return 0;
55 return n - (offset & (n-1));
56 }
57
58 /*
59 initialise a ndr parse structure from a data blob
60 */
61 _PUBLIC_ struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
62 {
63 struct ndr_pull *ndr;
64
65 ndr = talloc_zero(mem_ctx, struct ndr_pull);
66 if (!ndr) return NULL;
67 ndr->current_mem_ctx = mem_ctx;
68
69 ndr->data = blob->data;
70 ndr->data_size = blob->length;
71 ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
72
73 return ndr;
74 }
75
76 /*
77 advance by 'size' bytes
78 */
79 _PUBLIC_ enum ndr_err_code ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
80 {
81 ndr->offset += size;
82 if (ndr->offset > ndr->data_size) {
83 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
84 "ndr_pull_advance by %u failed",
85 size);
86 }
87 return NDR_ERR_SUCCESS;
88 }
89
90 /*
91 set the parse offset to 'ofs'
92 */
93 static enum ndr_err_code ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
94 {
95 ndr->offset = ofs;
96 if (ndr->offset > ndr->data_size) {
97 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
98 "ndr_pull_set_offset %u failed",
99 ofs);
100 }
101 return NDR_ERR_SUCCESS;
102 }
103
104 /* create a ndr_push structure, ready for some marshalling */
105 _PUBLIC_ struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
106 {
107 struct ndr_push *ndr;
108
109 ndr = talloc_zero(mem_ctx, struct ndr_push);
110 if (!ndr) {
111 return NULL;
112 }
113
114 ndr->flags = 0;
115 ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
116 ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
117 if (!ndr->data) {
118 return NULL;
119 }
120 ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
121
122 return ndr;
123 }
124
125 /* return a DATA_BLOB structure for the current ndr_push marshalled data */
126 _PUBLIC_ DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
127 {
128 DATA_BLOB blob;
129 blob = data_blob_const(ndr->data, ndr->offset);
130 if (ndr->alloc_size > ndr->offset) {
131 ndr->data[ndr->offset] = 0;
132 }
133 return blob;
134 }
135
136
137 /*
138 expand the available space in the buffer to ndr->offset + extra_size
139 */
140 _PUBLIC_ enum ndr_err_code ndr_push_expand(struct ndr_push *ndr, uint32_t extra_size)
141 {
142 uint32_t size = extra_size + ndr->offset;
143
144 if (size < ndr->offset) {
145 /* extra_size overflowed the offset */
146 return ndr_push_error(ndr, NDR_ERR_BUFSIZE, "Overflow in push_expand to %u",
147 size);
148 }
149
150 if (ndr->alloc_size > size) {
151 return NDR_ERR_SUCCESS;
152 }
153
154 ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
155 if (size+1 > ndr->alloc_size) {
156 ndr->alloc_size = size+1;
157 }
158 ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
159 if (!ndr->data) {
160 return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
161 ndr->alloc_size);
162 }
163
164 return NDR_ERR_SUCCESS;
165 }
166
167 _PUBLIC_ void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...)
168 {
169 va_list ap;
170 char *s = NULL;
171 int i, ret;
172
173 va_start(ap, format);
174 ret = vasprintf(&s, format, ap);
175 va_end(ap);
176
177 if (ret == -1) {
178 return;
179 }
180
181 for (i=0;i<ndr->depth;i++) {
182 DEBUGADD(1,(" "));
183 }
184
185 DEBUGADD(1,("%s\n", s));
186 free(s);
187 }
188
189 _PUBLIC_ void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...)
190 {
191 va_list ap;
192 int i;
193
194 for (i=0;i<ndr->depth;i++) {
195 ndr->private_data = talloc_asprintf_append_buffer(
196 (char *)ndr->private_data, " ");
197 }
198
199 va_start(ap, format);
200 ndr->private_data = talloc_vasprintf_append_buffer((char *)ndr->private_data,
201 format, ap);
202 va_end(ap);
203 ndr->private_data = talloc_asprintf_append_buffer((char *)ndr->private_data,
204 "\n");
205 }
206
207 /*
208 a useful helper function for printing idl structures via DEBUG()
209 */
210 _PUBLIC_ void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
211 {
212 struct ndr_print *ndr;
213
214 DEBUG(1,(" "));
215
216 ndr = talloc_zero(NULL, struct ndr_print);
217 if (!ndr) return;
218 ndr->print = ndr_print_debug_helper;
219 ndr->depth = 1;
220 ndr->flags = 0;
221 fn(ndr, name, ptr);
222 talloc_free(ndr);
223 }
224
225 /*
226 a useful helper function for printing idl unions via DEBUG()
227 */
228 _PUBLIC_ void ndr_print_union_debug(ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
229 {
230 struct ndr_print *ndr;
231
232 DEBUG(1,(" "));
233
234 ndr = talloc_zero(NULL, struct ndr_print);
235 if (!ndr) return;
236 ndr->print = ndr_print_debug_helper;
237 ndr->depth = 1;
238 ndr->flags = 0;
239 ndr_print_set_switch_value(ndr, ptr, level);
240 fn(ndr, name, ptr);
241 talloc_free(ndr);
242 }
243
244 /*
245 a useful helper function for printing idl function calls via DEBUG()
246 */
247 _PUBLIC_ void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
248 {
249 struct ndr_print *ndr;
250
251 DEBUG(1,(" "));
252
253 ndr = talloc_zero(NULL, struct ndr_print);
254 if (!ndr) return;
255 ndr->print = ndr_print_debug_helper;
256 ndr->depth = 1;
257 ndr->flags = 0;
258
259 /* this is a s4 hack until we build up the courage to pass
260 * this all the way down
261 */
262 #if _SAMBA_BUILD_ == 4
263 ndr->iconv_convenience = smb_iconv_convenience_init(talloc_autofree_context(), "ASCII", "UTF-8", true);
264 #endif
265
266 fn(ndr, name, flags, ptr);
267 talloc_free(ndr);
268 }
269
270 /*
271 a useful helper function for printing idl structures to a string
272 */
273 _PUBLIC_ char *ndr_print_struct_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, void *ptr)
274 {
275 struct ndr_print *ndr;
276 char *ret = NULL;
277
278 ndr = talloc_zero(mem_ctx, struct ndr_print);
279 if (!ndr) return NULL;
280 ndr->private_data = talloc_strdup(ndr, "");
281 if (!ndr->private_data) {
282 goto failed;
283 }
284 ndr->print = ndr_print_string_helper;
285 ndr->depth = 1;
286 ndr->flags = 0;
287
288 /* this is a s4 hack until we build up the courage to pass
289 * this all the way down
290 */
291 #if _SAMBA_BUILD_ == 4
292 ndr->iconv_convenience = smb_iconv_convenience_init(talloc_autofree_context(), "ASCII", "UTF-8", true);
293 #endif
294
295 fn(ndr, name, ptr);
296 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
297 failed:
298 talloc_free(ndr);
299 return ret;
300 }
301
302 /*
303 a useful helper function for printing idl unions to a string
304 */
305 _PUBLIC_ char *ndr_print_union_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
306 {
307 struct ndr_print *ndr;
308 char *ret = NULL;
309
310 ndr = talloc_zero(mem_ctx, struct ndr_print);
311 if (!ndr) return NULL;
312 ndr->private_data = talloc_strdup(ndr, "");
313 if (!ndr->private_data) {
314 goto failed;
315 }
316 ndr->print = ndr_print_string_helper;
317 ndr->depth = 1;
318 ndr->flags = 0;
319 ndr_print_set_switch_value(ndr, ptr, level);
320 fn(ndr, name, ptr);
321 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
322 failed:
323 talloc_free(ndr);
324 return ret;
325 }
326
327 /*
328 a useful helper function for printing idl function calls to a string
329 */
330 _PUBLIC_ char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
331 ndr_print_function_t fn, const char *name,
332 int flags, void *ptr)
333 {
334 struct ndr_print *ndr;
335 char *ret = NULL;
336
337 ndr = talloc_zero(mem_ctx, struct ndr_print);
338 if (!ndr) return NULL;
339 ndr->private_data = talloc_strdup(ndr, "");
340 if (!ndr->private_data) {
341 goto failed;
342 }
343 ndr->print = ndr_print_string_helper;
344 ndr->depth = 1;
345 ndr->flags = 0;
346 fn(ndr, name, flags, ptr);
347 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
348 failed:
349 talloc_free(ndr);
350 return ret;
351 }
352
353 _PUBLIC_ void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
354 {
355 /* the big/little endian flags are inter-dependent */
356 if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
357 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
358 (*pflags) &= ~LIBNDR_FLAG_NDR64;
359 }
360 if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
361 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
362 (*pflags) &= ~LIBNDR_FLAG_NDR64;
363 }
364 if (new_flags & LIBNDR_FLAG_REMAINING) {
365 (*pflags) &= ~LIBNDR_ALIGN_FLAGS;
366 }
367 if (new_flags & LIBNDR_ALIGN_FLAGS) {
368 (*pflags) &= ~LIBNDR_FLAG_REMAINING;
369 }
370 (*pflags) |= new_flags;
371 }
372
373 /*
374 return and possibly log an NDR error
375 */
376 _PUBLIC_ enum ndr_err_code ndr_pull_error(struct ndr_pull *ndr,
377 enum ndr_err_code ndr_err,
378 const char *format, ...)
379 {
380 char *s=NULL;
381 va_list ap;
382 int ret;
383
384 va_start(ap, format);
385 ret = vasprintf(&s, format, ap);
386 va_end(ap);
387
388 if (ret == -1) {
389 return NDR_ERR_ALLOC;
390 }
391
392 DEBUG(1,("ndr_pull_error(%u): %s\n", ndr_err, s));
393
394 free(s);
395
396 return ndr_err;
397 }
398
399 /*
400 return and possibly log an NDR error
401 */
402 _PUBLIC_ enum ndr_err_code ndr_push_error(struct ndr_push *ndr,
403 enum ndr_err_code ndr_err,
404 const char *format, ...)
405 {
406 char *s=NULL;
407 va_list ap;
408 int ret;
409
410 va_start(ap, format);
411 ret = vasprintf(&s, format, ap);
412 va_end(ap);
413
414 if (ret == -1) {
415 return NDR_ERR_ALLOC;
416 }
417
418 DEBUG(1,("ndr_push_error(%u): %s\n", ndr_err, s));
419
420 free(s);
421
422 return ndr_err;
423 }
424
425 /*
426 handle subcontext buffers, which in midl land are user-marshalled, but
427 we use magic in pidl to make them easier to cope with
428 */
429 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_start(struct ndr_pull *ndr,
430 struct ndr_pull **_subndr,
431 size_t header_size,
432 ssize_t size_is)
433 {
434 struct ndr_pull *subndr;
435 uint32_t r_content_size;
436 bool force_le = false;
437 bool force_be = false;
438
439 switch (header_size) {
440 case 0: {
441 uint32_t content_size = ndr->data_size - ndr->offset;
442 if (size_is >= 0) {
443 content_size = size_is;
444 }
445 r_content_size = content_size;
446 break;
447 }
448
449 case 2: {
450 uint16_t content_size;
451 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
452 if (size_is >= 0 && size_is != content_size) {
453 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
454 (int)size_is, (int)content_size);
455 }
456 r_content_size = content_size;
457 break;
458 }
459
460 case 4: {
461 uint32_t content_size;
462 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &content_size));
463 if (size_is >= 0 && size_is != content_size) {
464 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
465 (int)size_is, (int)content_size);
466 }
467 r_content_size = content_size;
468 break;
469 }
470 case 0xFFFFFC01: {
471 /*
472 * Common Type Header for the Serialization Stream
473 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
474 */
475 uint8_t version;
476 uint8_t drep;
477 uint16_t hdrlen;
478 uint32_t filler;
479 uint32_t content_size;
480 uint32_t reserved;
481
482 /* version */
483 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &version));
484
485 if (version != 1) {
486 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
487 "Bad subcontext (PULL) Common Type Header version %d != 1",
488 (int)version);
489 }
490
491 /*
492 * 0x10 little endian
493 * 0x00 big endian
494 */
495 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &drep));
496 if (drep == 0x10) {
497 force_le = true;
498 } else if (drep == 0x00) {
499 force_be = true;
500 } else {
501 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
502 "Bad subcontext (PULL) Common Type Header invalid drep 0x%02X",
503 (unsigned int)drep);
504 }
505
506 /* length of the "Private Header for Constructed Type" */
507 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &hdrlen));
508 if (hdrlen != 8) {
509 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
510 "Bad subcontext (PULL) Common Type Header length %d != 8",
511 (int)hdrlen);
512 }
513
514 /* filler should be ignored */
515 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &filler));
516
517 /*
518 * Private Header for Constructed Type
519 */
520 /* length - will be updated latter */
521 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
522 if (size_is >= 0 && size_is != content_size) {
523 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
524 (int)size_is, (int)content_size);
525 }
526 /* the content size must be a multiple of 8 */
527 if ((content_size % 8) != 0) {
528 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
529 "Bad subcontext (PULL) size_is(%d) not padded to 8 content_size %d",
530 (int)size_is, (int)content_size);
531 }
532 r_content_size = content_size;
533
534 /* reserved */
535 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &reserved));
536 break;
537 }
538 default:
539 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
540 (int)header_size);
541 }
542
543 NDR_PULL_NEED_BYTES(ndr, r_content_size);
544
545 subndr = talloc_zero(ndr, struct ndr_pull);
546 NDR_ERR_HAVE_NO_MEMORY(subndr);
547 subndr->flags = ndr->flags & ~LIBNDR_FLAG_NDR64;
548 subndr->current_mem_ctx = ndr->current_mem_ctx;
549
550 subndr->data = ndr->data + ndr->offset;
551 subndr->offset = 0;
552 subndr->data_size = r_content_size;
553 subndr->iconv_convenience = talloc_reference(subndr, ndr->iconv_convenience);
554
555 if (force_le) {
556 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_LITTLE_ENDIAN);
557 } else if (force_be) {
558 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_BIGENDIAN);
559 }
560
561 *_subndr = subndr;
562 return NDR_ERR_SUCCESS;
563 }
564
565 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_end(struct ndr_pull *ndr,
566 struct ndr_pull *subndr,
567 size_t header_size,
568 ssize_t size_is)
569 {
570 uint32_t advance;
571 if (size_is >= 0) {
572 advance = size_is;
573 } else if (header_size > 0) {
574 advance = subndr->data_size;
575 } else {
576 advance = subndr->offset;
577 }
578 NDR_CHECK(ndr_pull_advance(ndr, advance));
579 return NDR_ERR_SUCCESS;
580 }
581
582 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_start(struct ndr_push *ndr,
583 struct ndr_push **_subndr,
584 size_t header_size,
585 ssize_t size_is)
586 {
587 struct ndr_push *subndr;
588
589 subndr = ndr_push_init_ctx(ndr, ndr->iconv_convenience);
590 NDR_ERR_HAVE_NO_MEMORY(subndr);
591 subndr->flags = ndr->flags & ~LIBNDR_FLAG_NDR64;
592
593 *_subndr = subndr;
594 return NDR_ERR_SUCCESS;
595 }
596
597 /*
598 push a subcontext header
599 */
600 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_end(struct ndr_push *ndr,
601 struct ndr_push *subndr,
602 size_t header_size,
603 ssize_t size_is)
604 {
605 ssize_t padding_len;
606
607 if (size_is >= 0) {
608 padding_len = size_is - subndr->offset;
609 if (padding_len > 0) {
610 NDR_CHECK(ndr_push_zero(subndr, padding_len));
611 } else if (padding_len < 0) {
612 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
613 (int)subndr->offset, (int)size_is);
614 }
615 }
616
617 switch (header_size) {
618 case 0:
619 break;
620
621 case 2:
622 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
623 break;
624
625 case 4:
626 NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, subndr->offset));
627 break;
628
629 case 0xFFFFFC01:
630 /*
631 * Common Type Header for the Serialization Stream
632 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
633 */
634 padding_len = NDR_ROUND(subndr->offset, 8) - subndr->offset;
635 if (padding_len > 0) {
636 NDR_CHECK(ndr_push_zero(subndr, padding_len));
637 }
638
639 /* version */
640 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 1));
641
642 /*
643 * 0x10 little endian
644 * 0x00 big endian
645 */
646 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, NDR_BE(ndr)?0x00:0x10));
647
648 /* length of the "Private Header for Constructed Type" */
649 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 8));
650
651 /* filler */
652 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0xCCCCCCCC));
653
654 /*
655 * Private Header for Constructed Type
656 */
657 /* length - will be updated latter */
658 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
659
660 /* reserved */
661 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
662 break;
663
664 default:
665 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
666 (int)header_size);
667 }
668
669 NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
670 return NDR_ERR_SUCCESS;
671 }
672
673 /*
674 store a token in the ndr context, for later retrieval
675 */
676 _PUBLIC_ enum ndr_err_code ndr_token_store(TALLOC_CTX *mem_ctx,
677 struct ndr_token_list **list,
678 const void *key,
679 uint32_t value)
680 {
681 struct ndr_token_list *tok;
682 tok = talloc(mem_ctx, struct ndr_token_list);
683 NDR_ERR_HAVE_NO_MEMORY(tok);
684 tok->key = key;
685 tok->value = value;
686 DLIST_ADD((*list), tok);
687 return NDR_ERR_SUCCESS;
688 }
689
690 /*
691 retrieve a token from a ndr context, using cmp_fn to match the tokens
692 */
693 _PUBLIC_ enum ndr_err_code ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
694 comparison_fn_t _cmp_fn, bool _remove_tok)
695 {
696 struct ndr_token_list *tok;
697 for (tok=*list;tok;tok=tok->next) {
698 if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
699 else if (!_cmp_fn && tok->key == key) goto found;
700 }
701 return NDR_ERR_TOKEN;
702 found:
703 *v = tok->value;
704 if (_remove_tok) {
705 DLIST_REMOVE((*list), tok);
706 talloc_free(tok);
707 }
708 return NDR_ERR_SUCCESS;
709 }
710
711 /*
712 retrieve a token from a ndr context
713 */
714 _PUBLIC_ enum ndr_err_code ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
715 {
716 return ndr_token_retrieve_cmp_fn(list, key, v, NULL, true);
717 }
718
719 /*
720 peek at but don't removed a token from a ndr context
721 */
722 _PUBLIC_ uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
723 {
724 enum ndr_err_code status;
725 uint32_t v;
726
727 status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, false);
728 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
729 return 0;
730 }
731
732 return v;
733 }
734
735 /*
736 pull an array size field and add it to the array_size_list token list
737 */
738 _PUBLIC_ enum ndr_err_code ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
739 {
740 uint32_t size;
741 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &size));
742 return ndr_token_store(ndr, &ndr->array_size_list, p, size);
743 }
744
745 /*
746 get the stored array size field
747 */
748 _PUBLIC_ uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
749 {
750 return ndr_token_peek(&ndr->array_size_list, p);
751 }
752
753 /*
754 check the stored array size field
755 */
756 _PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
757 {
758 uint32_t stored;
759 stored = ndr_token_peek(&ndr->array_size_list, p);
760 if (stored != size) {
761 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
762 "Bad array size - got %u expected %u\n",
763 stored, size);
764 }
765 return NDR_ERR_SUCCESS;
766 }
767
768 /*
769 pull an array length field and add it to the array_length_list token list
770 */
771 _PUBLIC_ enum ndr_err_code ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
772 {
773 uint32_t length, offset;
774 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &offset));
775 if (offset != 0) {
776 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
777 "non-zero array offset %u\n", offset);
778 }
779 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &length));
780 return ndr_token_store(ndr, &ndr->array_length_list, p, length);
781 }
782
783 /*
784 get the stored array length field
785 */
786 _PUBLIC_ uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
787 {
788 return ndr_token_peek(&ndr->array_length_list, p);
789 }
790
791 /*
792 check the stored array length field
793 */
794 _PUBLIC_ enum ndr_err_code ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
795 {
796 uint32_t stored;
797 stored = ndr_token_peek(&ndr->array_length_list, p);
798 if (stored != length) {
799 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
800 "Bad array length - got %u expected %u\n",
801 stored, length);
802 }
803 return NDR_ERR_SUCCESS;
804 }
805
806 /*
807 store a switch value
808 */
809 _PUBLIC_ enum ndr_err_code ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
810 {
811 return ndr_token_store(ndr, &ndr->switch_list, p, val);
812 }
813
814 _PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
815 {
816 return ndr_token_store(ndr, &ndr->switch_list, p, val);
817 }
818
819 _PUBLIC_ enum ndr_err_code ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
820 {
821 return ndr_token_store(ndr, &ndr->switch_list, p, val);
822 }
823
824 /*
825 retrieve a switch value
826 */
827 _PUBLIC_ uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
828 {
829 return ndr_token_peek(&ndr->switch_list, p);
830 }
831
832 _PUBLIC_ uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
833 {
834 return ndr_token_peek(&ndr->switch_list, p);
835 }
836
837 _PUBLIC_ uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
838 {
839 return ndr_token_peek(&ndr->switch_list, p);
840 }
841
842 /*
843 pull a struct from a blob using NDR
844 */
845 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
846 ndr_pull_flags_fn_t fn)
847 {
848 struct ndr_pull *ndr;
849 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
850 NDR_ERR_HAVE_NO_MEMORY(ndr);
851 NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
852 talloc_free(ndr);
853 return NDR_ERR_SUCCESS;
854 }
855
856 /*
857 pull a struct from a blob using NDR - failing if all bytes are not consumed
858 */
859 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
860 struct smb_iconv_convenience *iconv_convenience,
861 void *p, ndr_pull_flags_fn_t fn)
862 {
863 struct ndr_pull *ndr;
864 uint32_t highest_ofs;
865 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
866 NDR_ERR_HAVE_NO_MEMORY(ndr);
867 NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
868 if (ndr->offset > ndr->relative_highest_offset) {
869 highest_ofs = ndr->offset;
870 } else {
871 highest_ofs = ndr->relative_highest_offset;
872 }
873 if (highest_ofs < ndr->data_size) {
874 enum ndr_err_code ret;
875 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
876 "not all bytes consumed ofs[%u] size[%u]",
877 highest_ofs, ndr->data_size);
878 talloc_free(ndr);
879 return ret;
880 }
881 talloc_free(ndr);
882 return NDR_ERR_SUCCESS;
883 }
884
885 /*
886 pull a union from a blob using NDR, given the union discriminator
887 */
888 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
889 struct smb_iconv_convenience *iconv_convenience, void *p,
890 uint32_t level, ndr_pull_flags_fn_t fn)
891 {
892 struct ndr_pull *ndr;
893 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
894 NDR_ERR_HAVE_NO_MEMORY(ndr);
895 NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
896 NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
897 talloc_free(ndr);
898 return NDR_ERR_SUCCESS;
899 }
900
901 /*
902 pull a union from a blob using NDR, given the union discriminator,
903 failing if all bytes are not consumed
904 */
905 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
906 struct smb_iconv_convenience *iconv_convenience, void *p,
907 uint32_t level, ndr_pull_flags_fn_t fn)
908 {
909 struct ndr_pull *ndr;
910 uint32_t highest_ofs;
911 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
912 NDR_ERR_HAVE_NO_MEMORY(ndr);
913 NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
914 NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
915 if (ndr->offset > ndr->relative_highest_offset) {
916 highest_ofs = ndr->offset;
917 } else {
918 highest_ofs = ndr->relative_highest_offset;
919 }
920 if (highest_ofs < ndr->data_size) {
921 enum ndr_err_code ret;
922 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
923 "not all bytes consumed ofs[%u] size[%u]",
924 highest_ofs, ndr->data_size);
925 talloc_free(ndr);
926 return ret;
927 }
928 talloc_free(ndr);
929 return NDR_ERR_SUCCESS;
930 }
931
932 /*
933 push a struct to a blob using NDR
934 */
935 _PUBLIC_ enum ndr_err_code ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, const void *p, ndr_push_flags_fn_t fn)
936 {
937 struct ndr_push *ndr;
938 ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
939 NDR_ERR_HAVE_NO_MEMORY(ndr);
940
941 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
942
943 *blob = ndr_push_blob(ndr);
944 talloc_steal(mem_ctx, blob->data);
945 talloc_free(ndr);
946
947 return NDR_ERR_SUCCESS;
948 }
949
950 /*
951 push a union to a blob using NDR
952 */
953 _PUBLIC_ enum ndr_err_code ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
954 uint32_t level, ndr_push_flags_fn_t fn)
955 {
956 struct ndr_push *ndr;
957 ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
958 NDR_ERR_HAVE_NO_MEMORY(ndr);
959
960 NDR_CHECK(ndr_push_set_switch_value(ndr, p, level));
961 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
962
963 *blob = ndr_push_blob(ndr);
964 talloc_steal(mem_ctx, blob->data);
965 talloc_free(ndr);
966
967 return NDR_ERR_SUCCESS;
968 }
969
970 /*
971 generic ndr_size_*() handler for structures
972 */
973 _PUBLIC_ size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push, struct smb_iconv_convenience *iconv_convenience)
974 {
975 struct ndr_push *ndr;
976 enum ndr_err_code status;
977 size_t ret;
978
979 /* avoid recursion */
980 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
981
982 ndr = ndr_push_init_ctx(NULL, iconv_convenience);
983 if (!ndr) return 0;
984 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
985 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
986 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
987 talloc_free(ndr);
988 return 0;
989 }
990 ret = ndr->offset;
991 talloc_free(ndr);
992 return ret;
993 }
994
995 /*
996 generic ndr_size_*() handler for unions
997 */
998 _PUBLIC_ size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push, struct smb_iconv_convenience *iconv_convenience)
999 {
1000 struct ndr_push *ndr;
1001 enum ndr_err_code status;
1002 size_t ret;
1003
1004 /* avoid recursion */
1005 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
1006
1007 ndr = ndr_push_init_ctx(NULL, iconv_convenience);
1008 if (!ndr) return 0;
1009 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
1010
1011 status = ndr_push_set_switch_value(ndr, p, level);
1012 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1013 talloc_free(ndr);
1014 return 0;
1015 }
1016 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
1017 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1018 talloc_free(ndr);
1019 return 0;
1020 }
1021 ret = ndr->offset;
1022 talloc_free(ndr);
1023 return ret;
1024 }
1025
1026 /*
1027 get the current base for relative pointers for the push
1028 */
1029 _PUBLIC_ uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
1030 {
1031 return ndr->relative_base_offset;
1032 }
1033
1034 /*
1035 restore the old base for relative pointers for the push
1036 */
1037 _PUBLIC_ void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
1038 {
1039 ndr->relative_base_offset = offset;
1040 }
1041
1042 /*
1043 setup the current base for relative pointers for the push
1044 called in the NDR_SCALAR stage
1045 */
1046 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
1047 {
1048 ndr->relative_base_offset = offset;
1049 return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1050 }
1051
1052 /*
1053 setup the current base for relative pointers for the push
1054 called in the NDR_BUFFERS stage
1055 */
1056 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
1057 {
1058 return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1059 }
1060
1061 /*
1062 push a relative object - stage1
1063 this is called during SCALARS processing
1064 */
1065 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
1066 {
1067 if (p == NULL) {
1068 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
1069 return NDR_ERR_SUCCESS;
1070 }
1071 NDR_CHECK(ndr_push_align(ndr, 4));
1072 NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1073 return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
1074 }
1075
1076 /*
1077 push a short relative object - stage1
1078 this is called during SCALARS processing
1079 */
1080 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr1(struct ndr_push *ndr, const void *p)
1081 {
1082 if (p == NULL) {
1083 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 0));
1084 return NDR_ERR_SUCCESS;
1085 }
1086 NDR_CHECK(ndr_push_align(ndr, 2));
1087 NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1088 return ndr_push_uint16(ndr, NDR_SCALARS, 0xFFFF);
1089 }
1090 /*
1091 push a relative object - stage2
1092 this is called during buffers processing
1093 */
1094 static enum ndr_err_code ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
1095 {
1096 uint32_t save_offset;
1097 uint32_t ptr_offset = 0xFFFFFFFF;
1098 if (p == NULL) {
1099 return NDR_ERR_SUCCESS;
1100 }
1101 save_offset = ndr->offset;
1102 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1103 if (ptr_offset > ndr->offset) {
1104 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1105 "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1106 ptr_offset, ndr->offset);
1107 }
1108 ndr->offset = ptr_offset;
1109 if (save_offset < ndr->relative_base_offset) {
1110 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1111 "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1112 save_offset, ndr->relative_base_offset);
1113 }
1114 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1115 ndr->offset = save_offset;
1116 return NDR_ERR_SUCCESS;
1117 }
1118 /*
1119 push a short relative object - stage2
1120 this is called during buffers processing
1121 */
1122 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr2(struct ndr_push *ndr, const void *p)
1123 {
1124 uint32_t save_offset;
1125 uint32_t ptr_offset = 0xFFFF;
1126 if (p == NULL) {
1127 return NDR_ERR_SUCCESS;
1128 }
1129 save_offset = ndr->offset;
1130 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1131 if (ptr_offset > ndr->offset) {
1132 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1133 "ndr_push_short_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1134 ptr_offset, ndr->offset);
1135 }
1136 ndr->offset = ptr_offset;
1137 if (save_offset < ndr->relative_base_offset) {
1138 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1139 "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1140 save_offset, ndr->relative_base_offset);
1141 }
1142 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1143 ndr->offset = save_offset;
1144 return NDR_ERR_SUCCESS;
1145 }
1146
1147 /*
1148 push a relative object - stage2 start
1149 this is called during buffers processing
1150 */
1151 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_start(struct ndr_push *ndr, const void *p)
1152 {
1153 if (p == NULL) {
1154 return NDR_ERR_SUCCESS;
1155 }
1156 return ndr_push_relative_ptr2(ndr, p);
1157 }
1158
1159 /*
1160 push a relative object - stage2 end
1161 this is called during buffers processing
1162 */
1163 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_end(struct ndr_push *ndr, const void *p)
1164 {
1165 if (p == NULL) {
1166 return NDR_ERR_SUCCESS;
1167 }
1168 return NDR_ERR_SUCCESS;
1169 }
1170
1171 /*
1172 get the current base for relative pointers for the pull
1173 */
1174 _PUBLIC_ uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
1175 {
1176 return ndr->relative_base_offset;
1177 }
1178
1179 /*
1180 restore the old base for relative pointers for the pull
1181 */
1182 _PUBLIC_ void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
1183 {
1184 ndr->relative_base_offset = offset;
1185 }
1186
1187 /*
1188 setup the current base for relative pointers for the pull
1189 called in the NDR_SCALAR stage
1190 */
1191 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
1192 {
1193 ndr->relative_base_offset = offset;
1194 return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1195 }
1196
1197 /*
1198 setup the current base for relative pointers for the pull
1199 called in the NDR_BUFFERS stage
1200 */
1201 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
1202 {
1203 return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1204 }
1205
1206 /*
1207 pull a relative object - stage1
1208 called during SCALARS processing
1209 */
1210 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
1211 {
1212 rel_offset += ndr->relative_base_offset;
1213 if (rel_offset > ndr->data_size) {
1214 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
1215 "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
1216 rel_offset, ndr->data_size);
1217 }
1218 return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
1219 }
1220
1221 /*
1222 pull a relative object - stage2
1223 called during BUFFERS processing
1224 */
1225 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
1226 {
1227 uint32_t rel_offset;
1228 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
1229 return ndr_pull_set_offset(ndr, rel_offset);
1230 }
1231
1232 const static struct {
1233 enum ndr_err_code err;
1234 const char *string;
1235 } ndr_err_code_strings[] = {
1236 { NDR_ERR_SUCCESS, "Success" },
1237 { NDR_ERR_ARRAY_SIZE, "Bad Array Size" },
1238 { NDR_ERR_BAD_SWITCH, "Bad Switch" },
1239 { NDR_ERR_OFFSET, "Offset Error" },
1240 { NDR_ERR_RELATIVE, "Relative Pointer Error" },
1241 { NDR_ERR_CHARCNV, "Character Conversion Error" },
1242 { NDR_ERR_LENGTH, "Length Error" },
1243 { NDR_ERR_SUBCONTEXT, "Subcontext Error" },
1244 { NDR_ERR_COMPRESSION, "Compression Error" },
1245 { NDR_ERR_STRING, "String Error" },
1246 { NDR_ERR_VALIDATE, "Validate Error" },
1247 { NDR_ERR_BUFSIZE, "Buffer Size Error" },
1248 { NDR_ERR_ALLOC, "Allocation Error" },
1249 { NDR_ERR_RANGE, "Range Error" },
1250 { NDR_ERR_TOKEN, "Token Error" },
1251 { NDR_ERR_IPV4ADDRESS, "IPv4 Address Error" },
1252 { NDR_ERR_INVALID_POINTER, "Invalid Pointer" },
1253 { NDR_ERR_UNREAD_BYTES, "Unread Bytes" },
1254 { NDR_ERR_NDR64, "NDR64 assertion error" },
1255 { 0, NULL }
1256 };
1257
1258 _PUBLIC_ const char *ndr_map_error2string(enum ndr_err_code ndr_err)
1259 {
1260 int i;
1261 for (i = 0; ndr_err_code_strings[i].string != NULL; i++) {
1262 if (ndr_err_code_strings[i].err == ndr_err)
1263 return ndr_err_code_strings[i].string;
1264 }
1265 return "Unknown error";
1266 }
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