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librpc/ndr: make ndr_push_relative_ptr2() static
[Samba.git] / librpc / ndr / ndr.c
blob17eb5e5a0586217ffde4cb00d7419e37805a9a01
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 fn(ndr, name, flags, ptr);
259 talloc_free(ndr);
260 }
261
262 /*
263 a useful helper function for printing idl structures to a string
264 */
265 _PUBLIC_ char *ndr_print_struct_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, void *ptr)
266 {
267 struct ndr_print *ndr;
268 char *ret = NULL;
269
270 ndr = talloc_zero(mem_ctx, struct ndr_print);
271 if (!ndr) return NULL;
272 ndr->private_data = talloc_strdup(ndr, "");
273 if (!ndr->private_data) {
274 goto failed;
275 }
276 ndr->print = ndr_print_string_helper;
277 ndr->depth = 1;
278 ndr->flags = 0;
279 fn(ndr, name, ptr);
280 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
281 failed:
282 talloc_free(ndr);
283 return ret;
284 }
285
286 /*
287 a useful helper function for printing idl unions to a string
288 */
289 _PUBLIC_ char *ndr_print_union_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
290 {
291 struct ndr_print *ndr;
292 char *ret = NULL;
293
294 ndr = talloc_zero(mem_ctx, struct ndr_print);
295 if (!ndr) return NULL;
296 ndr->private_data = talloc_strdup(ndr, "");
297 if (!ndr->private_data) {
298 goto failed;
299 }
300 ndr->print = ndr_print_string_helper;
301 ndr->depth = 1;
302 ndr->flags = 0;
303 ndr_print_set_switch_value(ndr, ptr, level);
304 fn(ndr, name, ptr);
305 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
306 failed:
307 talloc_free(ndr);
308 return ret;
309 }
310
311 /*
312 a useful helper function for printing idl function calls to a string
313 */
314 _PUBLIC_ char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
315 ndr_print_function_t fn, const char *name,
316 int flags, void *ptr)
317 {
318 struct ndr_print *ndr;
319 char *ret = NULL;
320
321 ndr = talloc_zero(mem_ctx, struct ndr_print);
322 if (!ndr) return NULL;
323 ndr->private_data = talloc_strdup(ndr, "");
324 if (!ndr->private_data) {
325 goto failed;
326 }
327 ndr->print = ndr_print_string_helper;
328 ndr->depth = 1;
329 ndr->flags = 0;
330 fn(ndr, name, flags, ptr);
331 ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
332 failed:
333 talloc_free(ndr);
334 return ret;
335 }
336
337 _PUBLIC_ void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
338 {
339 /* the big/little endian flags are inter-dependent */
340 if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
341 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
342 }
343 if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
344 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
345 }
346 if (new_flags & LIBNDR_FLAG_REMAINING) {
347 (*pflags) &= ~LIBNDR_ALIGN_FLAGS;
348 }
349 if (new_flags & LIBNDR_ALIGN_FLAGS) {
350 (*pflags) &= ~LIBNDR_FLAG_REMAINING;
351 }
352 (*pflags) |= new_flags;
353 }
354
355 /*
356 return and possibly log an NDR error
357 */
358 _PUBLIC_ enum ndr_err_code ndr_pull_error(struct ndr_pull *ndr,
359 enum ndr_err_code ndr_err,
360 const char *format, ...)
361 {
362 char *s=NULL;
363 va_list ap;
364 int ret;
365
366 va_start(ap, format);
367 ret = vasprintf(&s, format, ap);
368 va_end(ap);
369
370 if (ret == -1) {
371 return NDR_ERR_ALLOC;
372 }
373
374 DEBUG(1,("ndr_pull_error(%u): %s\n", ndr_err, s));
375
376 free(s);
377
378 return ndr_err;
379 }
380
381 /*
382 return and possibly log an NDR error
383 */
384 _PUBLIC_ enum ndr_err_code ndr_push_error(struct ndr_push *ndr,
385 enum ndr_err_code ndr_err,
386 const char *format, ...)
387 {
388 char *s=NULL;
389 va_list ap;
390 int ret;
391
392 va_start(ap, format);
393 ret = vasprintf(&s, format, ap);
394 va_end(ap);
395
396 if (ret == -1) {
397 return NDR_ERR_ALLOC;
398 }
399
400 DEBUG(1,("ndr_push_error(%u): %s\n", ndr_err, s));
401
402 free(s);
403
404 return ndr_err;
405 }
406
407 /*
408 handle subcontext buffers, which in midl land are user-marshalled, but
409 we use magic in pidl to make them easier to cope with
410 */
411 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_start(struct ndr_pull *ndr,
412 struct ndr_pull **_subndr,
413 size_t header_size,
414 ssize_t size_is)
415 {
416 struct ndr_pull *subndr;
417 uint32_t r_content_size;
418 bool force_le = false;
419 bool force_be = false;
420
421 switch (header_size) {
422 case 0: {
423 uint32_t content_size = ndr->data_size - ndr->offset;
424 if (size_is >= 0) {
425 content_size = size_is;
426 }
427 r_content_size = content_size;
428 break;
429 }
430
431 case 2: {
432 uint16_t content_size;
433 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
434 if (size_is >= 0 && size_is != content_size) {
435 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
436 (int)size_is, (int)content_size);
437 }
438 r_content_size = content_size;
439 break;
440 }
441
442 case 4: {
443 uint32_t content_size;
444 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
445 if (size_is >= 0 && size_is != content_size) {
446 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
447 (int)size_is, (int)content_size);
448 }
449 r_content_size = content_size;
450 break;
451 }
452 case 0xFFFFFC01: {
453 /*
454 * Common Type Header for the Serialization Stream
455 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
456 */
457 uint8_t version;
458 uint8_t drep;
459 uint16_t hdrlen;
460 uint32_t filler;
461 uint32_t content_size;
462 uint32_t reserved;
463
464 /* version */
465 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &version));
466
467 if (version != 1) {
468 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
469 "Bad subcontext (PULL) Common Type Header version %d != 1",
470 (int)version);
471 }
472
473 /*
474 * 0x10 little endian
475 * 0x00 big endian
476 */
477 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &drep));
478 if (drep == 0x10) {
479 force_le = true;
480 } else if (drep == 0x00) {
481 force_be = true;
482 } else {
483 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
484 "Bad subcontext (PULL) Common Type Header invalid drep 0x%02X",
485 (unsigned int)drep);
486 }
487
488 /* length of the "Private Header for Constructed Type" */
489 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &hdrlen));
490 if (hdrlen != 8) {
491 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
492 "Bad subcontext (PULL) Common Type Header length %d != 8",
493 (int)hdrlen);
494 }
495
496 /* filler should be ignored */
497 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &filler));
498
499 /*
500 * Private Header for Constructed Type
501 */
502 /* length - will be updated latter */
503 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
504 if (size_is >= 0 && size_is != content_size) {
505 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
506 (int)size_is, (int)content_size);
507 }
508 /* the content size must be a multiple of 8 */
509 if ((content_size % 8) != 0) {
510 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
511 "Bad subcontext (PULL) size_is(%d) not padded to 8 content_size %d",
512 (int)size_is, (int)content_size);
513 }
514 r_content_size = content_size;
515
516 /* reserved */
517 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &reserved));
518 break;
519 }
520 default:
521 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
522 (int)header_size);
523 }
524
525 NDR_PULL_NEED_BYTES(ndr, r_content_size);
526
527 subndr = talloc_zero(ndr, struct ndr_pull);
528 NDR_ERR_HAVE_NO_MEMORY(subndr);
529 subndr->flags = ndr->flags;
530 subndr->current_mem_ctx = ndr->current_mem_ctx;
531
532 subndr->data = ndr->data + ndr->offset;
533 subndr->offset = 0;
534 subndr->data_size = r_content_size;
535 subndr->iconv_convenience = talloc_reference(subndr, ndr->iconv_convenience);
536
537 if (force_le) {
538 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_LITTLE_ENDIAN);
539 } else if (force_be) {
540 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_BIGENDIAN);
541 }
542
543 *_subndr = subndr;
544 return NDR_ERR_SUCCESS;
545 }
546
547 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_end(struct ndr_pull *ndr,
548 struct ndr_pull *subndr,
549 size_t header_size,
550 ssize_t size_is)
551 {
552 uint32_t advance;
553 if (size_is >= 0) {
554 advance = size_is;
555 } else if (header_size > 0) {
556 advance = subndr->data_size;
557 } else {
558 advance = subndr->offset;
559 }
560 NDR_CHECK(ndr_pull_advance(ndr, advance));
561 return NDR_ERR_SUCCESS;
562 }
563
564 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_start(struct ndr_push *ndr,
565 struct ndr_push **_subndr,
566 size_t header_size,
567 ssize_t size_is)
568 {
569 struct ndr_push *subndr;
570
571 subndr = ndr_push_init_ctx(ndr, ndr->iconv_convenience);
572 NDR_ERR_HAVE_NO_MEMORY(subndr);
573 subndr->flags = ndr->flags;
574
575 *_subndr = subndr;
576 return NDR_ERR_SUCCESS;
577 }
578
579 /*
580 push a subcontext header
581 */
582 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_end(struct ndr_push *ndr,
583 struct ndr_push *subndr,
584 size_t header_size,
585 ssize_t size_is)
586 {
587 ssize_t padding_len;
588
589 if (size_is >= 0) {
590 padding_len = size_is - subndr->offset;
591 if (padding_len > 0) {
592 NDR_CHECK(ndr_push_zero(subndr, padding_len));
593 } else if (padding_len < 0) {
594 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
595 (int)subndr->offset, (int)size_is);
596 }
597 }
598
599 switch (header_size) {
600 case 0:
601 break;
602
603 case 2:
604 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
605 break;
606
607 case 4:
608 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
609 break;
610
611 case 0xFFFFFC01:
612 /*
613 * Common Type Header for the Serialization Stream
614 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
615 */
616 padding_len = NDR_ROUND(subndr->offset, 8) - subndr->offset;
617 if (padding_len > 0) {
618 NDR_CHECK(ndr_push_zero(subndr, padding_len));
619 }
620
621 /* version */
622 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 1));
623
624 /*
625 * 0x10 little endian
626 * 0x00 big endian
627 */
628 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, NDR_BE(ndr)?0x00:0x10));
629
630 /* length of the "Private Header for Constructed Type" */
631 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 8));
632
633 /* filler */
634 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0xCCCCCCCC));
635
636 /*
637 * Private Header for Constructed Type
638 */
639 /* length - will be updated latter */
640 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
641
642 /* reserved */
643 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
644 break;
645
646 default:
647 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
648 (int)header_size);
649 }
650
651 NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
652 return NDR_ERR_SUCCESS;
653 }
654
655 /*
656 store a token in the ndr context, for later retrieval
657 */
658 _PUBLIC_ enum ndr_err_code ndr_token_store(TALLOC_CTX *mem_ctx,
659 struct ndr_token_list **list,
660 const void *key,
661 uint32_t value)
662 {
663 struct ndr_token_list *tok;
664 tok = talloc(mem_ctx, struct ndr_token_list);
665 NDR_ERR_HAVE_NO_MEMORY(tok);
666 tok->key = key;
667 tok->value = value;
668 DLIST_ADD((*list), tok);
669 return NDR_ERR_SUCCESS;
670 }
671
672 /*
673 retrieve a token from a ndr context, using cmp_fn to match the tokens
674 */
675 _PUBLIC_ enum ndr_err_code ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
676 comparison_fn_t _cmp_fn, bool _remove_tok)
677 {
678 struct ndr_token_list *tok;
679 for (tok=*list;tok;tok=tok->next) {
680 if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
681 else if (!_cmp_fn && tok->key == key) goto found;
682 }
683 return NDR_ERR_TOKEN;
684 found:
685 *v = tok->value;
686 if (_remove_tok) {
687 DLIST_REMOVE((*list), tok);
688 talloc_free(tok);
689 }
690 return NDR_ERR_SUCCESS;
691 }
692
693 /*
694 retrieve a token from a ndr context
695 */
696 _PUBLIC_ enum ndr_err_code ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
697 {
698 return ndr_token_retrieve_cmp_fn(list, key, v, NULL, true);
699 }
700
701 /*
702 peek at but don't removed a token from a ndr context
703 */
704 _PUBLIC_ uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
705 {
706 enum ndr_err_code status;
707 uint32_t v;
708
709 status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, false);
710 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
711 return 0;
712 }
713
714 return v;
715 }
716
717 /*
718 pull an array size field and add it to the array_size_list token list
719 */
720 _PUBLIC_ enum ndr_err_code ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
721 {
722 uint32_t size;
723 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &size));
724 return ndr_token_store(ndr, &ndr->array_size_list, p, size);
725 }
726
727 /*
728 get the stored array size field
729 */
730 _PUBLIC_ uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
731 {
732 return ndr_token_peek(&ndr->array_size_list, p);
733 }
734
735 /*
736 check the stored array size field
737 */
738 _PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
739 {
740 uint32_t stored;
741 stored = ndr_token_peek(&ndr->array_size_list, p);
742 if (stored != size) {
743 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
744 "Bad array size - got %u expected %u\n",
745 stored, size);
746 }
747 return NDR_ERR_SUCCESS;
748 }
749
750 /*
751 pull an array length field and add it to the array_length_list token list
752 */
753 _PUBLIC_ enum ndr_err_code ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
754 {
755 uint32_t length, offset;
756 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &offset));
757 if (offset != 0) {
758 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
759 "non-zero array offset %u\n", offset);
760 }
761 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &length));
762 return ndr_token_store(ndr, &ndr->array_length_list, p, length);
763 }
764
765 /*
766 get the stored array length field
767 */
768 _PUBLIC_ uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
769 {
770 return ndr_token_peek(&ndr->array_length_list, p);
771 }
772
773 /*
774 check the stored array length field
775 */
776 _PUBLIC_ enum ndr_err_code ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
777 {
778 uint32_t stored;
779 stored = ndr_token_peek(&ndr->array_length_list, p);
780 if (stored != length) {
781 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
782 "Bad array length - got %u expected %u\n",
783 stored, length);
784 }
785 return NDR_ERR_SUCCESS;
786 }
787
788 /*
789 store a switch value
790 */
791 _PUBLIC_ enum ndr_err_code ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
792 {
793 return ndr_token_store(ndr, &ndr->switch_list, p, val);
794 }
795
796 _PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
797 {
798 return ndr_token_store(ndr, &ndr->switch_list, p, val);
799 }
800
801 _PUBLIC_ enum ndr_err_code ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
802 {
803 return ndr_token_store(ndr, &ndr->switch_list, p, val);
804 }
805
806 /*
807 retrieve a switch value
808 */
809 _PUBLIC_ uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
810 {
811 return ndr_token_peek(&ndr->switch_list, p);
812 }
813
814 _PUBLIC_ uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
815 {
816 return ndr_token_peek(&ndr->switch_list, p);
817 }
818
819 _PUBLIC_ uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
820 {
821 return ndr_token_peek(&ndr->switch_list, p);
822 }
823
824 /*
825 pull a struct from a blob using NDR
826 */
827 _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,
828 ndr_pull_flags_fn_t fn)
829 {
830 struct ndr_pull *ndr;
831 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
832 NDR_ERR_HAVE_NO_MEMORY(ndr);
833 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
834 return NDR_ERR_SUCCESS;
835 }
836
837 /*
838 pull a struct from a blob using NDR - failing if all bytes are not consumed
839 */
840 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
841 struct smb_iconv_convenience *iconv_convenience,
842 void *p, ndr_pull_flags_fn_t fn)
843 {
844 struct ndr_pull *ndr;
845 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
846 NDR_ERR_HAVE_NO_MEMORY(ndr);
847 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
848 if (ndr->offset < ndr->data_size) {
849 return ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
850 "not all bytes consumed ofs[%u] size[%u]",
851 ndr->offset, ndr->data_size);
852 }
853 return NDR_ERR_SUCCESS;
854 }
855
856 /*
857 pull a union from a blob using NDR, given the union discriminator
858 */
859 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
860 struct smb_iconv_convenience *iconv_convenience, void *p,
861 uint32_t level, ndr_pull_flags_fn_t fn)
862 {
863 struct ndr_pull *ndr;
864 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
865 NDR_ERR_HAVE_NO_MEMORY(ndr);
866 NDR_CHECK(ndr_pull_set_switch_value(ndr, p, level));
867 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
868 return NDR_ERR_SUCCESS;
869 }
870
871 /*
872 pull a union from a blob using NDR, given the union discriminator,
873 failing if all bytes are not consumed
874 */
875 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
876 struct smb_iconv_convenience *iconv_convenience, void *p,
877 uint32_t level, ndr_pull_flags_fn_t fn)
878 {
879 struct ndr_pull *ndr;
880 ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
881 NDR_ERR_HAVE_NO_MEMORY(ndr);
882 NDR_CHECK(ndr_pull_set_switch_value(ndr, p, level));
883 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
884 if (ndr->offset < ndr->data_size) {
885 return ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
886 "not all bytes consumed ofs[%u] size[%u]",
887 ndr->offset, ndr->data_size);
888 }
889 return NDR_ERR_SUCCESS;
890 }
891
892 /*
893 push a struct to a blob using NDR
894 */
895 _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)
896 {
897 struct ndr_push *ndr;
898 ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
899 NDR_ERR_HAVE_NO_MEMORY(ndr);
900
901 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
902
903 *blob = ndr_push_blob(ndr);
904 talloc_steal(mem_ctx, blob->data);
905 talloc_free(ndr);
906
907 return NDR_ERR_SUCCESS;
908 }
909
910 /*
911 push a union to a blob using NDR
912 */
913 _PUBLIC_ enum ndr_err_code ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
914 uint32_t level, ndr_push_flags_fn_t fn)
915 {
916 struct ndr_push *ndr;
917 ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
918 NDR_ERR_HAVE_NO_MEMORY(ndr);
919
920 NDR_CHECK(ndr_push_set_switch_value(ndr, p, level));
921 NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
922
923 *blob = ndr_push_blob(ndr);
924 talloc_steal(mem_ctx, blob->data);
925 talloc_free(ndr);
926
927 return NDR_ERR_SUCCESS;
928 }
929
930 /*
931 generic ndr_size_*() handler for structures
932 */
933 _PUBLIC_ size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push, struct smb_iconv_convenience *iconv_convenience)
934 {
935 struct ndr_push *ndr;
936 enum ndr_err_code status;
937 size_t ret;
938
939 /* avoid recursion */
940 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
941
942 ndr = ndr_push_init_ctx(NULL, iconv_convenience);
943 if (!ndr) return 0;
944 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
945 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
946 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
947 talloc_free(ndr);
948 return 0;
949 }
950 ret = ndr->offset;
951 talloc_free(ndr);
952 return ret;
953 }
954
955 /*
956 generic ndr_size_*() handler for unions
957 */
958 _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)
959 {
960 struct ndr_push *ndr;
961 enum ndr_err_code status;
962 size_t ret;
963
964 /* avoid recursion */
965 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
966
967 ndr = ndr_push_init_ctx(NULL, iconv_convenience);
968 if (!ndr) return 0;
969 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
970
971 status = ndr_push_set_switch_value(ndr, p, level);
972 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
973 talloc_free(ndr);
974 return 0;
975 }
976 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
977 if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
978 talloc_free(ndr);
979 return 0;
980 }
981 ret = ndr->offset;
982 talloc_free(ndr);
983 return ret;
984 }
985
986 /*
987 get the current base for relative pointers for the push
988 */
989 _PUBLIC_ uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
990 {
991 return ndr->relative_base_offset;
992 }
993
994 /*
995 restore the old base for relative pointers for the push
996 */
997 _PUBLIC_ void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
998 {
999 ndr->relative_base_offset = offset;
1000 }
1001
1002 /*
1003 setup the current base for relative pointers for the push
1004 called in the NDR_SCALAR stage
1005 */
1006 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
1007 {
1008 ndr->relative_base_offset = offset;
1009 return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1010 }
1011
1012 /*
1013 setup the current base for relative pointers for the push
1014 called in the NDR_BUFFERS stage
1015 */
1016 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
1017 {
1018 return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1019 }
1020
1021 /*
1022 push a relative object - stage1
1023 this is called during SCALARS processing
1024 */
1025 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
1026 {
1027 if (p == NULL) {
1028 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
1029 return NDR_ERR_SUCCESS;
1030 }
1031 NDR_CHECK(ndr_push_align(ndr, 4));
1032 NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1033 return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
1034 }
1035
1036 /*
1037 push a relative object - stage2
1038 this is called during buffers processing
1039 */
1040 static enum ndr_err_code ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
1041 {
1042 uint32_t save_offset;
1043 uint32_t ptr_offset = 0xFFFFFFFF;
1044 if (p == NULL) {
1045 return NDR_ERR_SUCCESS;
1046 }
1047 save_offset = ndr->offset;
1048 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1049 if (ptr_offset > ndr->offset) {
1050 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1051 "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1052 ptr_offset, ndr->offset);
1053 }
1054 ndr->offset = ptr_offset;
1055 if (save_offset < ndr->relative_base_offset) {
1056 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1057 "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1058 save_offset, ndr->relative_base_offset);
1059 }
1060 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1061 ndr->offset = save_offset;
1062 return NDR_ERR_SUCCESS;
1063 }
1064
1065 /*
1066 push a relative object - stage2 start
1067 this is called during buffers processing
1068 */
1069 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_start(struct ndr_push *ndr, const void *p)
1070 {
1071 if (p == NULL) {
1072 return NDR_ERR_SUCCESS;
1073 }
1074 return ndr_push_relative_ptr2(ndr, p);
1075 }
1076
1077 /*
1078 push a relative object - stage2 end
1079 this is called during buffers processing
1080 */
1081 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_end(struct ndr_push *ndr, const void *p)
1082 {
1083 if (p == NULL) {
1084 return NDR_ERR_SUCCESS;
1085 }
1086 return NDR_ERR_SUCCESS;
1087 }
1088
1089 /*
1090 get the current base for relative pointers for the pull
1091 */
1092 _PUBLIC_ uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
1093 {
1094 return ndr->relative_base_offset;
1095 }
1096
1097 /*
1098 restore the old base for relative pointers for the pull
1099 */
1100 _PUBLIC_ void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
1101 {
1102 ndr->relative_base_offset = offset;
1103 }
1104
1105 /*
1106 setup the current base for relative pointers for the pull
1107 called in the NDR_SCALAR stage
1108 */
1109 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
1110 {
1111 ndr->relative_base_offset = offset;
1112 return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1113 }
1114
1115 /*
1116 setup the current base for relative pointers for the pull
1117 called in the NDR_BUFFERS stage
1118 */
1119 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
1120 {
1121 return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1122 }
1123
1124 /*
1125 pull a relative object - stage1
1126 called during SCALARS processing
1127 */
1128 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
1129 {
1130 rel_offset += ndr->relative_base_offset;
1131 if (rel_offset > ndr->data_size) {
1132 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
1133 "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
1134 rel_offset, ndr->data_size);
1135 }
1136 return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
1137 }
1138
1139 /*
1140 pull a relative object - stage2
1141 called during BUFFERS processing
1142 */
1143 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
1144 {
1145 uint32_t rel_offset;
1146 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
1147 return ndr_pull_set_offset(ndr, rel_offset);
1148 }
1149
1150 const static struct {
1151 enum ndr_err_code err;
1152 const char *string;
1153 } ndr_err_code_strings[] = {
1154 { NDR_ERR_SUCCESS, "Success" },
1155 { NDR_ERR_ARRAY_SIZE, "Bad Array Size" },
1156 { NDR_ERR_BAD_SWITCH, "Bad Switch" },
1157 { NDR_ERR_OFFSET, "Offset Error" },
1158 { NDR_ERR_RELATIVE, "Relative Pointer Error" },
1159 { NDR_ERR_CHARCNV, "Character Conversion Error" },
1160 { NDR_ERR_LENGTH, "Length Error" },
1161 { NDR_ERR_SUBCONTEXT, "Subcontext Error" },
1162 { NDR_ERR_COMPRESSION, "Compression Error" },
1163 { NDR_ERR_STRING, "String Error" },
1164 { NDR_ERR_VALIDATE, "Validate Error" },
1165 { NDR_ERR_BUFSIZE, "Buffer Size Error" },
1166 { NDR_ERR_ALLOC, "Allocation Error" },
1167 { NDR_ERR_RANGE, "Range Error" },
1168 { NDR_ERR_TOKEN, "Token Error" },
1169 { NDR_ERR_IPV4ADDRESS, "IPv4 Address Error" },
1170 { NDR_ERR_INVALID_POINTER, "Invalid Pointer" },
1171 { NDR_ERR_UNREAD_BYTES, "Unread Bytes" },
1172 { 0, NULL }
1173 };
1174
1175 _PUBLIC_ const char *ndr_map_error2string(enum ndr_err_code ndr_err)
1176 {
1177 int i;
1178 for (i = 0; ndr_err_code_strings[i].string != NULL; i++) {
1179 if (ndr_err_code_strings[i].err == ndr_err)
1180 return ndr_err_code_strings[i].string;
1181 }
1182 return "Unknown error";
1183 }
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