1 /*
2 * ng_parse.c
3 */
4
5 /*-
6 * Copyright (c) 1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Archie Cobbs <archie@freebsd.org>
39 *
40 * $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $
41 * $FreeBSD$
42 */
43
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/errno.h>
49 #include <sys/limits.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/ctype.h>
53
54 #include <machine/stdarg.h>
55
56 #include <net/ethernet.h>
57
58 #include <netinet/in.h>
59
60 #include <netgraph/ng_message.h>
61 #include <netgraph/netgraph.h>
62 #include <netgraph/ng_parse.h>
63
64 #ifdef NG_SEPARATE_MALLOC
65 static MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info");
66 #else
67 #define M_NETGRAPH_PARSE M_NETGRAPH
68 #endif
69
70 /* Compute alignment for primitive integral types */
71 struct int16_temp {
72 char x;
73 int16_t y;
74 };
75
76 struct int32_temp {
77 char x;
78 int32_t y;
79 };
80
81 struct int64_temp {
82 char x;
83 int64_t y;
84 };
85
86 #define INT8_ALIGNMENT 1
87 #define INT16_ALIGNMENT ((size_t)&((struct int16_temp *)0)->y)
88 #define INT32_ALIGNMENT ((size_t)&((struct int32_temp *)0)->y)
89 #define INT64_ALIGNMENT ((size_t)&((struct int64_temp *)0)->y)
90
91 /* Output format for integral types */
92 #define INT_UNSIGNED 0
93 #define INT_SIGNED 1
94 #define INT_HEX 2
95
96 /* Type of composite object: struct, array, or fixedarray */
97 enum comptype {
98 CT_STRUCT,
99 CT_ARRAY,
100 CT_FIXEDARRAY,
101 };
102
103 /* Composite types helper functions */
104 static int ng_parse_composite(const struct ng_parse_type *type,
105 const char *s, int *off, const u_char *start,
106 u_char *const buf, int *buflen, enum comptype ctype);
107 static int ng_unparse_composite(const struct ng_parse_type *type,
108 const u_char *data, int *off, char *cbuf, int cbuflen,
109 enum comptype ctype);
110 static int ng_get_composite_elem_default(const struct ng_parse_type *type,
111 int index, const u_char *start, u_char *buf,
112 int *buflen, enum comptype ctype);
113 static int ng_get_composite_len(const struct ng_parse_type *type,
114 const u_char *start, const u_char *buf,
115 enum comptype ctype);
116 static const struct ng_parse_type *ng_get_composite_etype(const struct
117 ng_parse_type *type, int index, enum comptype ctype);
118 static int ng_parse_get_elem_pad(const struct ng_parse_type *type,
119 int index, enum comptype ctype, int posn);
120
121 /* Parsing helper functions */
122 static int ng_parse_skip_value(const char *s, int off, int *lenp);
123 static int ng_parse_append(char **cbufp, int *cbuflenp,
124 const char *fmt, ...);
125
126 /* Poor man's virtual method calls */
127 #define METHOD(t,m) (ng_get_ ## m ## _method(t))
128 #define INVOKE(t,m) (*METHOD(t,m))
129
130 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t);
131 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t);
132 static ng_getDefault_t *ng_get_getDefault_method(const
133 struct ng_parse_type *t);
134 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t);
135
136 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \
137 0 : INVOKE(t, getAlign)(t))
138
139 /************************************************************************
140 PUBLIC FUNCTIONS
141 ************************************************************************/
142
143 /*
144 * Convert an ASCII string to binary according to the supplied type descriptor
145 */
146 int
147 ng_parse(const struct ng_parse_type *type,
148 const char *string, int *off, u_char *buf, int *buflen)
149 {
150 return INVOKE(type, parse)(type, string, off, buf, buf, buflen);
151 }
152
153 /*
154 * Convert binary to an ASCII string according to the supplied type descriptor
155 */
156 int
157 ng_unparse(const struct ng_parse_type *type,
158 const u_char *data, char *cbuf, int cbuflen)
159 {
160 int off = 0;
161
162 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen);
163 }
164
165 /*
166 * Fill in the default value according to the supplied type descriptor
167 */
168 int
169 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen)
170 {
171 ng_getDefault_t *const func = METHOD(type, getDefault);
172
173 if (func == NULL)
174 return (EOPNOTSUPP);
175 return (*func)(type, buf, buf, buflen);
176 }
177
178 /************************************************************************
179 STRUCTURE TYPE
180 ************************************************************************/
181
182 static int
183 ng_struct_parse(const struct ng_parse_type *type,
184 const char *s, int *off, const u_char *const start,
185 u_char *const buf, int *buflen)
186 {
187 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT);
188 }
189
190 static int
191 ng_struct_unparse(const struct ng_parse_type *type,
192 const u_char *data, int *off, char *cbuf, int cbuflen)
193 {
194 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT);
195 }
196
197 static int
198 ng_struct_getDefault(const struct ng_parse_type *type,
199 const u_char *const start, u_char *buf, int *buflen)
200 {
201 int off = 0;
202
203 return ng_parse_composite(type,
204 "{}", &off, start, buf, buflen, CT_STRUCT);
205 }
206
207 static int
208 ng_struct_getAlign(const struct ng_parse_type *type)
209 {
210 const struct ng_parse_struct_field *field;
211 int align = 0;
212
213 for (field = type->info; field->name != NULL; field++) {
214 int falign = ALIGNMENT(field->type);
215
216 if (falign > align)
217 align = falign;
218 }
219 return align;
220 }
221
222 const struct ng_parse_type ng_parse_struct_type = {
223 NULL,
224 NULL,
225 NULL,
226 ng_struct_parse,
227 ng_struct_unparse,
228 ng_struct_getDefault,
229 ng_struct_getAlign
230 };
231
232 /************************************************************************
233 FIXED LENGTH ARRAY TYPE
234 ************************************************************************/
235
236 static int
237 ng_fixedarray_parse(const struct ng_parse_type *type,
238 const char *s, int *off, const u_char *const start,
239 u_char *const buf, int *buflen)
240 {
241 return ng_parse_composite(type,
242 s, off, start, buf, buflen, CT_FIXEDARRAY);
243 }
244
245 static int
246 ng_fixedarray_unparse(const struct ng_parse_type *type,
247 const u_char *data, int *off, char *cbuf, int cbuflen)
248 {
249 return ng_unparse_composite(type,
250 data, off, cbuf, cbuflen, CT_FIXEDARRAY);
251 }
252
253 static int
254 ng_fixedarray_getDefault(const struct ng_parse_type *type,
255 const u_char *const start, u_char *buf, int *buflen)
256 {
257 int off = 0;
258
259 return ng_parse_composite(type,
260 "[]", &off, start, buf, buflen, CT_FIXEDARRAY);
261 }
262
263 static int
264 ng_fixedarray_getAlign(const struct ng_parse_type *type)
265 {
266 const struct ng_parse_fixedarray_info *fi = type->info;
267
268 return ALIGNMENT(fi->elementType);
269 }
270
271 const struct ng_parse_type ng_parse_fixedarray_type = {
272 NULL,
273 NULL,
274 NULL,
275 ng_fixedarray_parse,
276 ng_fixedarray_unparse,
277 ng_fixedarray_getDefault,
278 ng_fixedarray_getAlign
279 };
280
281 /************************************************************************
282 VARIABLE LENGTH ARRAY TYPE
283 ************************************************************************/
284
285 static int
286 ng_array_parse(const struct ng_parse_type *type,
287 const char *s, int *off, const u_char *const start,
288 u_char *const buf, int *buflen)
289 {
290 return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY);
291 }
292
293 static int
294 ng_array_unparse(const struct ng_parse_type *type,
295 const u_char *data, int *off, char *cbuf, int cbuflen)
296 {
297 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY);
298 }
299
300 static int
301 ng_array_getDefault(const struct ng_parse_type *type,
302 const u_char *const start, u_char *buf, int *buflen)
303 {
304 int off = 0;
305
306 return ng_parse_composite(type,
307 "[]", &off, start, buf, buflen, CT_ARRAY);
308 }
309
310 static int
311 ng_array_getAlign(const struct ng_parse_type *type)
312 {
313 const struct ng_parse_array_info *ai = type->info;
314
315 return ALIGNMENT(ai->elementType);
316 }
317
318 const struct ng_parse_type ng_parse_array_type = {
319 NULL,
320 NULL,
321 NULL,
322 ng_array_parse,
323 ng_array_unparse,
324 ng_array_getDefault,
325 ng_array_getAlign
326 };
327
328 /************************************************************************
329 INT8 TYPE
330 ************************************************************************/
331
332 static int
333 ng_int8_parse(const struct ng_parse_type *type,
334 const char *s, int *off, const u_char *const start,
335 u_char *const buf, int *buflen)
336 {
337 long val;
338 int8_t val8;
339 char *eptr;
340
341 val = strtol(s + *off, &eptr, 0);
342 if (val < (int8_t)0x80 || val > (u_int8_t)0xff || eptr == s + *off)
343 return (EINVAL);
344 *off = eptr - s;
345 val8 = (int8_t)val;
346 bcopy(&val8, buf, sizeof(int8_t));
347 *buflen = sizeof(int8_t);
348 return (0);
349 }
350
351 static int
352 ng_int8_unparse(const struct ng_parse_type *type,
353 const u_char *data, int *off, char *cbuf, int cbuflen)
354 {
355 const char *fmt;
356 int fval;
357 int error;
358 int8_t val;
359
360 bcopy(data + *off, &val, sizeof(int8_t));
361 switch ((intptr_t)type->info) {
362 case INT_SIGNED:
363 fmt = "%d";
364 fval = val;
365 break;
366 case INT_UNSIGNED:
367 fmt = "%u";
368 fval = (u_int8_t)val;
369 break;
370 case INT_HEX:
371 fmt = "0x%x";
372 fval = (u_int8_t)val;
373 break;
374 default:
375 panic("%s: unknown type", __func__);
376 }
377 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
378 return (error);
379 *off += sizeof(int8_t);
380 return (0);
381 }
382
383 static int
384 ng_int8_getDefault(const struct ng_parse_type *type,
385 const u_char *const start, u_char *buf, int *buflen)
386 {
387 int8_t val;
388
389 if (*buflen < sizeof(int8_t))
390 return (ERANGE);
391 val = 0;
392 bcopy(&val, buf, sizeof(int8_t));
393 *buflen = sizeof(int8_t);
394 return (0);
395 }
396
397 static int
398 ng_int8_getAlign(const struct ng_parse_type *type)
399 {
400 return INT8_ALIGNMENT;
401 }
402
403 const struct ng_parse_type ng_parse_int8_type = {
404 NULL,
405 (void *)INT_SIGNED,
406 NULL,
407 ng_int8_parse,
408 ng_int8_unparse,
409 ng_int8_getDefault,
410 ng_int8_getAlign
411 };
412
413 const struct ng_parse_type ng_parse_uint8_type = {
414 &ng_parse_int8_type,
415 (void *)INT_UNSIGNED
416 };
417
418 const struct ng_parse_type ng_parse_hint8_type = {
419 &ng_parse_int8_type,
420 (void *)INT_HEX
421 };
422
423 /************************************************************************
424 INT16 TYPE
425 ************************************************************************/
426
427 static int
428 ng_int16_parse(const struct ng_parse_type *type,
429 const char *s, int *off, const u_char *const start,
430 u_char *const buf, int *buflen)
431 {
432 long val;
433 int16_t val16;
434 char *eptr;
435
436 val = strtol(s + *off, &eptr, 0);
437 if (val < (int16_t)0x8000
438 || val > (u_int16_t)0xffff || eptr == s + *off)
439 return (EINVAL);
440 *off = eptr - s;
441 val16 = (int16_t)val;
442 bcopy(&val16, buf, sizeof(int16_t));
443 *buflen = sizeof(int16_t);
444 return (0);
445 }
446
447 static int
448 ng_int16_unparse(const struct ng_parse_type *type,
449 const u_char *data, int *off, char *cbuf, int cbuflen)
450 {
451 const char *fmt;
452 int fval;
453 int error;
454 int16_t val;
455
456 bcopy(data + *off, &val, sizeof(int16_t));
457 switch ((intptr_t)type->info) {
458 case INT_SIGNED:
459 fmt = "%d";
460 fval = val;
461 break;
462 case INT_UNSIGNED:
463 fmt = "%u";
464 fval = (u_int16_t)val;
465 break;
466 case INT_HEX:
467 fmt = "0x%x";
468 fval = (u_int16_t)val;
469 break;
470 default:
471 panic("%s: unknown type", __func__);
472 }
473 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
474 return (error);
475 *off += sizeof(int16_t);
476 return (0);
477 }
478
479 static int
480 ng_int16_getDefault(const struct ng_parse_type *type,
481 const u_char *const start, u_char *buf, int *buflen)
482 {
483 int16_t val;
484
485 if (*buflen < sizeof(int16_t))
486 return (ERANGE);
487 val = 0;
488 bcopy(&val, buf, sizeof(int16_t));
489 *buflen = sizeof(int16_t);
490 return (0);
491 }
492
493 static int
494 ng_int16_getAlign(const struct ng_parse_type *type)
495 {
496 return INT16_ALIGNMENT;
497 }
498
499 const struct ng_parse_type ng_parse_int16_type = {
500 NULL,
501 (void *)INT_SIGNED,
502 NULL,
503 ng_int16_parse,
504 ng_int16_unparse,
505 ng_int16_getDefault,
506 ng_int16_getAlign
507 };
508
509 const struct ng_parse_type ng_parse_uint16_type = {
510 &ng_parse_int16_type,
511 (void *)INT_UNSIGNED
512 };
513
514 const struct ng_parse_type ng_parse_hint16_type = {
515 &ng_parse_int16_type,
516 (void *)INT_HEX
517 };
518
519 /************************************************************************
520 INT32 TYPE
521 ************************************************************************/
522
523 static int
524 ng_int32_parse(const struct ng_parse_type *type,
525 const char *s, int *off, const u_char *const start,
526 u_char *const buf, int *buflen)
527 {
528 long val; /* assumes long is at least 32 bits */
529 int32_t val32;
530 char *eptr;
531
532 if ((intptr_t)type->info == INT_SIGNED)
533 val = strtol(s + *off, &eptr, 0);
534 else
535 val = strtoul(s + *off, &eptr, 0);
536 if (val < (int32_t)0x80000000
537 || val > (u_int32_t)0xffffffff || eptr == s + *off)
538 return (EINVAL);
539 *off = eptr - s;
540 val32 = (int32_t)val;
541 bcopy(&val32, buf, sizeof(int32_t));
542 *buflen = sizeof(int32_t);
543 return (0);
544 }
545
546 static int
547 ng_int32_unparse(const struct ng_parse_type *type,
548 const u_char *data, int *off, char *cbuf, int cbuflen)
549 {
550 const char *fmt;
551 long fval;
552 int error;
553 int32_t val;
554
555 bcopy(data + *off, &val, sizeof(int32_t));
556 switch ((intptr_t)type->info) {
557 case INT_SIGNED:
558 fmt = "%ld";
559 fval = val;
560 break;
561 case INT_UNSIGNED:
562 fmt = "%lu";
563 fval = (u_int32_t)val;
564 break;
565 case INT_HEX:
566 fmt = "0x%lx";
567 fval = (u_int32_t)val;
568 break;
569 default:
570 panic("%s: unknown type", __func__);
571 }
572 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
573 return (error);
574 *off += sizeof(int32_t);
575 return (0);
576 }
577
578 static int
579 ng_int32_getDefault(const struct ng_parse_type *type,
580 const u_char *const start, u_char *buf, int *buflen)
581 {
582 int32_t val;
583
584 if (*buflen < sizeof(int32_t))
585 return (ERANGE);
586 val = 0;
587 bcopy(&val, buf, sizeof(int32_t));
588 *buflen = sizeof(int32_t);
589 return (0);
590 }
591
592 static int
593 ng_int32_getAlign(const struct ng_parse_type *type)
594 {
595 return INT32_ALIGNMENT;
596 }
597
598 const struct ng_parse_type ng_parse_int32_type = {
599 NULL,
600 (void *)INT_SIGNED,
601 NULL,
602 ng_int32_parse,
603 ng_int32_unparse,
604 ng_int32_getDefault,
605 ng_int32_getAlign
606 };
607
608 const struct ng_parse_type ng_parse_uint32_type = {
609 &ng_parse_int32_type,
610 (void *)INT_UNSIGNED
611 };
612
613 const struct ng_parse_type ng_parse_hint32_type = {
614 &ng_parse_int32_type,
615 (void *)INT_HEX
616 };
617
618 /************************************************************************
619 INT64 TYPE
620 ************************************************************************/
621
622 static int
623 ng_int64_parse(const struct ng_parse_type *type,
624 const char *s, int *off, const u_char *const start,
625 u_char *const buf, int *buflen)
626 {
627 quad_t val;
628 int64_t val64;
629 char *eptr;
630
631 val = strtoq(s + *off, &eptr, 0);
632 if (eptr == s + *off)
633 return (EINVAL);
634 *off = eptr - s;
635 val64 = (int64_t)val;
636 bcopy(&val64, buf, sizeof(int64_t));
637 *buflen = sizeof(int64_t);
638 return (0);
639 }
640
641 static int
642 ng_int64_unparse(const struct ng_parse_type *type,
643 const u_char *data, int *off, char *cbuf, int cbuflen)
644 {
645 const char *fmt;
646 long long fval;
647 int64_t val;
648 int error;
649
650 bcopy(data + *off, &val, sizeof(int64_t));
651 switch ((intptr_t)type->info) {
652 case INT_SIGNED:
653 fmt = "%lld";
654 fval = val;
655 break;
656 case INT_UNSIGNED:
657 fmt = "%llu";
658 fval = (u_int64_t)val;
659 break;
660 case INT_HEX:
661 fmt = "0x%llx";
662 fval = (u_int64_t)val;
663 break;
664 default:
665 panic("%s: unknown type", __func__);
666 }
667 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
668 return (error);
669 *off += sizeof(int64_t);
670 return (0);
671 }
672
673 static int
674 ng_int64_getDefault(const struct ng_parse_type *type,
675 const u_char *const start, u_char *buf, int *buflen)
676 {
677 int64_t val;
678
679 if (*buflen < sizeof(int64_t))
680 return (ERANGE);
681 val = 0;
682 bcopy(&val, buf, sizeof(int64_t));
683 *buflen = sizeof(int64_t);
684 return (0);
685 }
686
687 static int
688 ng_int64_getAlign(const struct ng_parse_type *type)
689 {
690 return INT64_ALIGNMENT;
691 }
692
693 const struct ng_parse_type ng_parse_int64_type = {
694 NULL,
695 (void *)INT_SIGNED,
696 NULL,
697 ng_int64_parse,
698 ng_int64_unparse,
699 ng_int64_getDefault,
700 ng_int64_getAlign
701 };
702
703 const struct ng_parse_type ng_parse_uint64_type = {
704 &ng_parse_int64_type,
705 (void *)INT_UNSIGNED
706 };
707
708 const struct ng_parse_type ng_parse_hint64_type = {
709 &ng_parse_int64_type,
710 (void *)INT_HEX
711 };
712
713 /************************************************************************
714 STRING TYPE
715 ************************************************************************/
716
717 static int
718 ng_string_parse(const struct ng_parse_type *type,
719 const char *s, int *off, const u_char *const start,
720 u_char *const buf, int *buflen)
721 {
722 char *sval;
723 int len;
724 int slen;
725
726 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
727 return (EINVAL);
728 *off += len;
729 bcopy(sval, buf, slen + 1);
730 free(sval, M_NETGRAPH_PARSE);
731 *buflen = slen + 1;
732 return (0);
733 }
734
735 static int
736 ng_string_unparse(const struct ng_parse_type *type,
737 const u_char *data, int *off, char *cbuf, int cbuflen)
738 {
739 const char *const raw = (const char *)data + *off;
740 char *const s = ng_encode_string(raw, strlen(raw));
741 int error;
742
743 if (s == NULL)
744 return (ENOMEM);
745 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) {
746 free(s, M_NETGRAPH_PARSE);
747 return (error);
748 }
749 *off += strlen(raw) + 1;
750 free(s, M_NETGRAPH_PARSE);
751 return (0);
752 }
753
754 static int
755 ng_string_getDefault(const struct ng_parse_type *type,
756 const u_char *const start, u_char *buf, int *buflen)
757 {
758
759 if (*buflen < 1)
760 return (ERANGE);
761 buf[0] = (u_char)'\0';
762 *buflen = 1;
763 return (0);
764 }
765
766 const struct ng_parse_type ng_parse_string_type = {
767 NULL,
768 NULL,
769 NULL,
770 ng_string_parse,
771 ng_string_unparse,
772 ng_string_getDefault,
773 NULL
774 };
775
776 /************************************************************************
777 FIXED BUFFER STRING TYPE
778 ************************************************************************/
779
780 static int
781 ng_fixedstring_parse(const struct ng_parse_type *type,
782 const char *s, int *off, const u_char *const start,
783 u_char *const buf, int *buflen)
784 {
785 const struct ng_parse_fixedstring_info *const fi = type->info;
786 char *sval;
787 int len;
788 int slen;
789
790 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
791 return (EINVAL);
792 if (slen + 1 > fi->bufSize) {
793 free(sval, M_NETGRAPH_PARSE);
794 return (E2BIG);
795 }
796 *off += len;
797 bcopy(sval, buf, slen);
798 free(sval, M_NETGRAPH_PARSE);
799 bzero(buf + slen, fi->bufSize - slen);
800 *buflen = fi->bufSize;
801 return (0);
802 }
803
804 static int
805 ng_fixedstring_unparse(const struct ng_parse_type *type,
806 const u_char *data, int *off, char *cbuf, int cbuflen)
807 {
808 const struct ng_parse_fixedstring_info *const fi = type->info;
809 int error, temp = *off;
810
811 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0)
812 return (error);
813 *off += fi->bufSize;
814 return (0);
815 }
816
817 static int
818 ng_fixedstring_getDefault(const struct ng_parse_type *type,
819 const u_char *const start, u_char *buf, int *buflen)
820 {
821 const struct ng_parse_fixedstring_info *const fi = type->info;
822
823 if (*buflen < fi->bufSize)
824 return (ERANGE);
825 bzero(buf, fi->bufSize);
826 *buflen = fi->bufSize;
827 return (0);
828 }
829
830 const struct ng_parse_type ng_parse_fixedstring_type = {
831 NULL,
832 NULL,
833 NULL,
834 ng_fixedstring_parse,
835 ng_fixedstring_unparse,
836 ng_fixedstring_getDefault,
837 NULL
838 };
839
840 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = {
841 NG_NODESIZ
842 };
843 const struct ng_parse_type ng_parse_nodebuf_type = {
844 &ng_parse_fixedstring_type,
845 &ng_parse_nodebuf_info
846 };
847
848 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = {
849 NG_HOOKSIZ
850 };
851 const struct ng_parse_type ng_parse_hookbuf_type = {
852 &ng_parse_fixedstring_type,
853 &ng_parse_hookbuf_info
854 };
855
856 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = {
857 NG_PATHSIZ
858 };
859 const struct ng_parse_type ng_parse_pathbuf_type = {
860 &ng_parse_fixedstring_type,
861 &ng_parse_pathbuf_info
862 };
863
864 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = {
865 NG_TYPESIZ
866 };
867 const struct ng_parse_type ng_parse_typebuf_type = {
868 &ng_parse_fixedstring_type,
869 &ng_parse_typebuf_info
870 };
871
872 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = {
873 NG_CMDSTRSIZ
874 };
875 const struct ng_parse_type ng_parse_cmdbuf_type = {
876 &ng_parse_fixedstring_type,
877 &ng_parse_cmdbuf_info
878 };
879
880 /************************************************************************
881 EXPLICITLY SIZED STRING TYPE
882 ************************************************************************/
883
884 static int
885 ng_sizedstring_parse(const struct ng_parse_type *type,
886 const char *s, int *off, const u_char *const start,
887 u_char *const buf, int *buflen)
888 {
889 char *sval;
890 int len;
891 int slen;
892
893 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
894 return (EINVAL);
895 if (slen > USHRT_MAX) {
896 free(sval, M_NETGRAPH_PARSE);
897 return (EINVAL);
898 }
899 *off += len;
900 *((u_int16_t *)buf) = (u_int16_t)slen;
901 bcopy(sval, buf + 2, slen);
902 free(sval, M_NETGRAPH_PARSE);
903 *buflen = 2 + slen;
904 return (0);
905 }
906
907 static int
908 ng_sizedstring_unparse(const struct ng_parse_type *type,
909 const u_char *data, int *off, char *cbuf, int cbuflen)
910 {
911 const char *const raw = (const char *)data + *off + 2;
912 const int slen = *((const u_int16_t *)(data + *off));
913 char *const s = ng_encode_string(raw, slen);
914 int error;
915
916 if (s == NULL)
917 return (ENOMEM);
918 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) {
919 free(s, M_NETGRAPH_PARSE);
920 return (error);
921 }
922 free(s, M_NETGRAPH_PARSE);
923 *off += slen + 2;
924 return (0);
925 }
926
927 static int
928 ng_sizedstring_getDefault(const struct ng_parse_type *type,
929 const u_char *const start, u_char *buf, int *buflen)
930 {
931 if (*buflen < 2)
932 return (ERANGE);
933 bzero(buf, 2);
934 *buflen = 2;
935 return (0);
936 }
937
938 const struct ng_parse_type ng_parse_sizedstring_type = {
939 NULL,
940 NULL,
941 NULL,
942 ng_sizedstring_parse,
943 ng_sizedstring_unparse,
944 ng_sizedstring_getDefault,
945 NULL
946 };
947
948 /************************************************************************
949 IP ADDRESS TYPE
950 ************************************************************************/
951
952 static int
953 ng_ipaddr_parse(const struct ng_parse_type *type,
954 const char *s, int *off, const u_char *const start,
955 u_char *const buf, int *buflen)
956 {
957 int i, error;
958
959 for (i = 0; i < 4; i++) {
960 if ((error = ng_int8_parse(&ng_parse_int8_type,
961 s, off, start, buf + i, buflen)) != 0)
962 return (error);
963 if (i < 3) {
964 if (s[*off] != '.')
965 return (EINVAL);
966 (*off)++;
967 }
968 }
969 *buflen = 4;
970 return (0);
971 }
972
973 static int
974 ng_ipaddr_unparse(const struct ng_parse_type *type,
975 const u_char *data, int *off, char *cbuf, int cbuflen)
976 {
977 struct in_addr ip;
978 int error;
979
980 bcopy(data + *off, &ip, sizeof(ip));
981 if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d",
982 ((u_char *)&ip)[0], ((u_char *)&ip)[1],
983 ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0)
984 return (error);
985 *off += sizeof(ip);
986 return (0);
987 }
988
989 static int
990 ng_ipaddr_getDefault(const struct ng_parse_type *type,
991 const u_char *const start, u_char *buf, int *buflen)
992 {
993 struct in_addr ip = { 0 };
994
995 if (*buflen < sizeof(ip))
996 return (ERANGE);
997 bcopy(&ip, buf, sizeof(ip));
998 *buflen = sizeof(ip);
999 return (0);
1000 }
1001
1002 const struct ng_parse_type ng_parse_ipaddr_type = {
1003 NULL,
1004 NULL,
1005 NULL,
1006 ng_ipaddr_parse,
1007 ng_ipaddr_unparse,
1008 ng_ipaddr_getDefault,
1009 ng_int32_getAlign
1010 };
1011
1012 /************************************************************************
1013 ETHERNET ADDRESS TYPE
1014 ************************************************************************/
1015
1016 static int
1017 ng_enaddr_parse(const struct ng_parse_type *type,
1018 const char *s, int *const off, const u_char *const start,
1019 u_char *const buf, int *const buflen)
1020 {
1021 char *eptr;
1022 u_long val;
1023 int i;
1024
1025 if (*buflen < ETHER_ADDR_LEN)
1026 return (ERANGE);
1027 for (i = 0; i < ETHER_ADDR_LEN; i++) {
1028 val = strtoul(s + *off, &eptr, 16);
1029 if (val > 0xff || eptr == s + *off)
1030 return (EINVAL);
1031 buf[i] = (u_char)val;
1032 *off = (eptr - s);
1033 if (i < ETHER_ADDR_LEN - 1) {
1034 if (*eptr != ':')
1035 return (EINVAL);
1036 (*off)++;
1037 }
1038 }
1039 *buflen = ETHER_ADDR_LEN;
1040 return (0);
1041 }
1042
1043 static int
1044 ng_enaddr_unparse(const struct ng_parse_type *type,
1045 const u_char *data, int *off, char *cbuf, int cbuflen)
1046 {
1047 int len;
1048
1049 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
1050 data[*off], data[*off + 1], data[*off + 2],
1051 data[*off + 3], data[*off + 4], data[*off + 5]);
1052 if (len >= cbuflen)
1053 return (ERANGE);
1054 *off += ETHER_ADDR_LEN;
1055 return (0);
1056 }
1057
1058 const struct ng_parse_type ng_parse_enaddr_type = {
1059 NULL,
1060 NULL,
1061 NULL,
1062 ng_enaddr_parse,
1063 ng_enaddr_unparse,
1064 NULL,
1065 0
1066 };
1067
1068 /************************************************************************
1069 BYTE ARRAY TYPE
1070 ************************************************************************/
1071
1072 /* Get the length of a byte array */
1073 static int
1074 ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type,
1075 const u_char *start, const u_char *buf)
1076 {
1077 ng_parse_array_getLength_t *const getLength = type->private;
1078
1079 return (*getLength)(type, start, buf);
1080 }
1081
1082 /* Byte array element type is hex int8 */
1083 static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = {
1084 &ng_parse_hint8_type,
1085 &ng_parse_bytearray_subtype_getLength,
1086 NULL
1087 };
1088 static const struct ng_parse_type ng_parse_bytearray_subtype = {
1089 &ng_parse_array_type,
1090 &ng_parse_bytearray_subtype_info
1091 };
1092
1093 static int
1094 ng_bytearray_parse(const struct ng_parse_type *type,
1095 const char *s, int *off, const u_char *const start,
1096 u_char *const buf, int *buflen)
1097 {
1098 char *str;
1099 int toklen;
1100 int slen;
1101
1102 /* We accept either an array of bytes or a string constant */
1103 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) {
1104 ng_parse_array_getLength_t *const getLength = type->info;
1105 int arraylen;
1106
1107 arraylen = (*getLength)(type, start, buf);
1108 if (arraylen > *buflen) {
1109 free(str, M_NETGRAPH_PARSE);
1110 return (ERANGE);
1111 }
1112 if (slen > arraylen) {
1113 free(str, M_NETGRAPH_PARSE);
1114 return (E2BIG);
1115 }
1116 bcopy(str, buf, slen);
1117 bzero(buf + slen, arraylen - slen);
1118 free(str, M_NETGRAPH_PARSE);
1119 *off += toklen;
1120 *buflen = arraylen;
1121 return (0);
1122 } else {
1123 struct ng_parse_type subtype;
1124
1125 subtype = ng_parse_bytearray_subtype;
1126 subtype.private = __DECONST(void *, type->info);
1127 return ng_array_parse(&subtype, s, off, start, buf, buflen);
1128 }
1129 }
1130
1131 static int
1132 ng_bytearray_unparse(const struct ng_parse_type *type,
1133 const u_char *data, int *off, char *cbuf, int cbuflen)
1134 {
1135 struct ng_parse_type subtype;
1136
1137 subtype = ng_parse_bytearray_subtype;
1138 subtype.private = __DECONST(void *, type->info);
1139 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen);
1140 }
1141
1142 static int
1143 ng_bytearray_getDefault(const struct ng_parse_type *type,
1144 const u_char *const start, u_char *buf, int *buflen)
1145 {
1146 struct ng_parse_type subtype;
1147
1148 subtype = ng_parse_bytearray_subtype;
1149 subtype.private = __DECONST(void *, type->info);
1150 return ng_array_getDefault(&subtype, start, buf, buflen);
1151 }
1152
1153 const struct ng_parse_type ng_parse_bytearray_type = {
1154 NULL,
1155 NULL,
1156 NULL,
1157 ng_bytearray_parse,
1158 ng_bytearray_unparse,
1159 ng_bytearray_getDefault,
1160 NULL
1161 };
1162
1163 /************************************************************************
1164 STRUCT NG_MESG TYPE
1165 ************************************************************************/
1166
1167 /* Get msg->header.arglen when "buf" is pointing to msg->data */
1168 static int
1169 ng_parse_ng_mesg_getLength(const struct ng_parse_type *type,
1170 const u_char *start, const u_char *buf)
1171 {
1172 const struct ng_mesg *msg;
1173
1174 msg = (const struct ng_mesg *)(buf - sizeof(*msg));
1175 return msg->header.arglen;
1176 }
1177
1178 /* Type for the variable length data portion of a struct ng_mesg */
1179 static const struct ng_parse_type ng_msg_data_type = {
1180 &ng_parse_bytearray_type,
1181 &ng_parse_ng_mesg_getLength
1182 };
1183
1184 /* Type for the entire struct ng_mesg header with data section */
1185 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[]
1186 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type);
1187 const struct ng_parse_type ng_parse_ng_mesg_type = {
1188 &ng_parse_struct_type,
1189 &ng_parse_ng_mesg_type_fields,
1190 };
1191
1192 /************************************************************************
1193 COMPOSITE HELPER ROUTINES
1194 ************************************************************************/
1195
1196 /*
1197 * Convert a structure or array from ASCII to binary
1198 */
1199 static int
1200 ng_parse_composite(const struct ng_parse_type *type, const char *s,
1201 int *off, const u_char *const start, u_char *const buf, int *buflen,
1202 const enum comptype ctype)
1203 {
1204 const int num = ng_get_composite_len(type, start, buf, ctype);
1205 int nextIndex = 0; /* next implicit array index */
1206 u_int index; /* field or element index */
1207 int *foff; /* field value offsets in string */
1208 int align, len, blen, error = 0;
1209
1210 /* Initialize */
1211 foff = malloc(num * sizeof(*foff), M_NETGRAPH_PARSE, M_NOWAIT | M_ZERO);
1212 if (foff == NULL) {
1213 error = ENOMEM;
1214 goto done;
1215 }
1216
1217 /* Get opening brace/bracket */
1218 if (ng_parse_get_token(s, off, &len)
1219 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) {
1220 error = EINVAL;
1221 goto done;
1222 }
1223 *off += len;
1224
1225 /* Get individual element value positions in the string */
1226 for (;;) {
1227 enum ng_parse_token tok;
1228
1229 /* Check for closing brace/bracket */
1230 tok = ng_parse_get_token(s, off, &len);
1231 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) {
1232 *off += len;
1233 break;
1234 }
1235
1236 /* For arrays, the 'name' (ie, index) is optional, so
1237 distinguish name from values by seeing if the next
1238 token is an equals sign */
1239 if (ctype != CT_STRUCT) {
1240 u_long ul;
1241 int len2, off2;
1242 char *eptr;
1243
1244 /* If an opening brace/bracket, index is implied */
1245 if (tok == T_LBRACE || tok == T_LBRACKET) {
1246 index = nextIndex++;
1247 goto gotIndex;
1248 }
1249
1250 /* Might be an index, might be a value, either way... */
1251 if (tok != T_WORD) {
1252 error = EINVAL;
1253 goto done;
1254 }
1255
1256 /* If no equals sign follows, index is implied */
1257 off2 = *off + len;
1258 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) {
1259 index = nextIndex++;
1260 goto gotIndex;
1261 }
1262
1263 /* Index was specified explicitly; parse it */
1264 ul = strtoul(s + *off, &eptr, 0);
1265 if (ul == ULONG_MAX || eptr - (s + *off) != len) {
1266 error = EINVAL;
1267 goto done;
1268 }
1269 index = (u_int)ul;
1270 nextIndex = index + 1;
1271 *off += len + len2;
1272 } else { /* a structure field */
1273 const struct ng_parse_struct_field *const
1274 fields = type->info;
1275
1276 /* Find the field by name (required) in field list */
1277 if (tok != T_WORD) {
1278 error = EINVAL;
1279 goto done;
1280 }
1281 for (index = 0; index < num; index++) {
1282 const struct ng_parse_struct_field *const
1283 field = &fields[index];
1284
1285 if (strncmp(&s[*off], field->name, len) == 0
1286 && field->name[len] == '\0')
1287 break;
1288 }
1289 if (index == num) {
1290 error = ENOENT;
1291 goto done;
1292 }
1293 *off += len;
1294
1295 /* Get equals sign */
1296 if (ng_parse_get_token(s, off, &len) != T_EQUALS) {
1297 error = EINVAL;
1298 goto done;
1299 }
1300 *off += len;
1301 }
1302 gotIndex:
1303
1304 /* Check array index */
1305 if (index >= num) {
1306 error = E2BIG;
1307 goto done;
1308 }
1309
1310 /* Save value's position and skip over it for now */
1311 if (foff[index] != 0) {
1312 error = EALREADY; /* duplicate */
1313 goto done;
1314 }
1315 while (isspace(s[*off]))
1316 (*off)++;
1317 foff[index] = *off;
1318 if ((error = ng_parse_skip_value(s, *off, &len)) != 0)
1319 goto done;
1320 *off += len;
1321 }
1322
1323 /* Now build binary structure from supplied values and defaults */
1324 for (blen = index = 0; index < num; index++) {
1325 const struct ng_parse_type *const
1326 etype = ng_get_composite_etype(type, index, ctype);
1327 int k, pad, vlen;
1328
1329 /* Zero-pad any alignment bytes */
1330 pad = ng_parse_get_elem_pad(type, index, ctype, blen);
1331 for (k = 0; k < pad; k++) {
1332 if (blen >= *buflen) {
1333 error = ERANGE;
1334 goto done;
1335 }
1336 buf[blen++] = 0;
1337 }
1338
1339 /* Get value */
1340 vlen = *buflen - blen;
1341 if (foff[index] == 0) { /* use default value */
1342 error = ng_get_composite_elem_default(type, index,
1343 start, buf + blen, &vlen, ctype);
1344 } else { /* parse given value */
1345 *off = foff[index];
1346 error = INVOKE(etype, parse)(etype,
1347 s, off, start, buf + blen, &vlen);
1348 }
1349 if (error != 0)
1350 goto done;
1351 blen += vlen;
1352 }
1353
1354 /* Make total composite structure size a multiple of its alignment */
1355 if ((align = ALIGNMENT(type)) != 0) {
1356 while (blen % align != 0) {
1357 if (blen >= *buflen) {
1358 error = ERANGE;
1359 goto done;
1360 }
1361 buf[blen++] = 0;
1362 }
1363 }
1364
1365 /* Done */
1366 *buflen = blen;
1367 done:
1368 if (foff != NULL)
1369 free(foff, M_NETGRAPH_PARSE);
1370 return (error);
1371 }
1372
1373 /*
1374 * Convert an array or structure from binary to ASCII
1375 */
1376 static int
1377 ng_unparse_composite(const struct ng_parse_type *type, const u_char *data,
1378 int *off, char *cbuf, int cbuflen, const enum comptype ctype)
1379 {
1380 const struct ng_mesg *const hdr
1381 = (const struct ng_mesg *)(data - sizeof(*hdr));
1382 const int num = ng_get_composite_len(type, data, data + *off, ctype);
1383 const int workSize = 20 * 1024; /* XXX hard coded constant */
1384 int nextIndex = 0, didOne = 0;
1385 int error, index;
1386 u_char *workBuf;
1387
1388 /* Get workspace for checking default values */
1389 workBuf = malloc(workSize, M_NETGRAPH_PARSE, M_NOWAIT);
1390 if (workBuf == NULL)
1391 return (ENOMEM);
1392
1393 /* Opening brace/bracket */
1394 if ((error = ng_parse_append(&cbuf, &cbuflen, "%c",
1395 (ctype == CT_STRUCT) ? '{' : '[')) != 0)
1396 goto fail;
1397
1398 /* Do each item */
1399 for (index = 0; index < num; index++) {
1400 const struct ng_parse_type *const
1401 etype = ng_get_composite_etype(type, index, ctype);
1402
1403 /* Skip any alignment pad bytes */
1404 *off += ng_parse_get_elem_pad(type, index, ctype, *off);
1405
1406 /*
1407 * See if element is equal to its default value; skip if so.
1408 * Copy struct ng_mesg header for types that peek into it.
1409 */
1410 if (sizeof(*hdr) + *off < workSize) {
1411 int tempsize = workSize - sizeof(*hdr) - *off;
1412
1413 bcopy(hdr, workBuf, sizeof(*hdr) + *off);
1414 if (ng_get_composite_elem_default(type, index, workBuf
1415 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off,
1416 &tempsize, ctype) == 0
1417 && bcmp(workBuf + sizeof(*hdr) + *off,
1418 data + *off, tempsize) == 0) {
1419 *off += tempsize;
1420 continue;
1421 }
1422 }
1423
1424 /* Print name= */
1425 if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0)
1426 goto fail;
1427 if (ctype != CT_STRUCT) {
1428 if (index != nextIndex) {
1429 nextIndex = index;
1430 if ((error = ng_parse_append(&cbuf,
1431 &cbuflen, "%d=", index)) != 0)
1432 goto fail;
1433 }
1434 nextIndex++;
1435 } else {
1436 const struct ng_parse_struct_field *const
1437 fields = type->info;
1438
1439 if ((error = ng_parse_append(&cbuf,
1440 &cbuflen, "%s=", fields[index].name)) != 0)
1441 goto fail;
1442 }
1443
1444 /* Print value */
1445 if ((error = INVOKE(etype, unparse)
1446 (etype, data, off, cbuf, cbuflen)) != 0) {
1447 free(workBuf, M_NETGRAPH_PARSE);
1448 return (error);
1449 }
1450 cbuflen -= strlen(cbuf);
1451 cbuf += strlen(cbuf);
1452 didOne = 1;
1453 }
1454
1455 /* Closing brace/bracket */
1456 error = ng_parse_append(&cbuf, &cbuflen, "%s%c",
1457 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']');
1458
1459 fail:
1460 /* Clean up after failure */
1461 free(workBuf, M_NETGRAPH_PARSE);
1462 return (error);
1463 }
1464
1465 /*
1466 * Generate the default value for an element of an array or structure
1467 * Returns EOPNOTSUPP if default value is unspecified.
1468 */
1469 static int
1470 ng_get_composite_elem_default(const struct ng_parse_type *type,
1471 int index, const u_char *const start, u_char *buf, int *buflen,
1472 const enum comptype ctype)
1473 {
1474 const struct ng_parse_type *etype;
1475 ng_getDefault_t *func;
1476
1477 switch (ctype) {
1478 case CT_STRUCT:
1479 break;
1480 case CT_ARRAY:
1481 {
1482 const struct ng_parse_array_info *const ai = type->info;
1483
1484 if (ai->getDefault != NULL) {
1485 return (*ai->getDefault)(type,
1486 index, start, buf, buflen);
1487 }
1488 break;
1489 }
1490 case CT_FIXEDARRAY:
1491 {
1492 const struct ng_parse_fixedarray_info *const fi = type->info;
1493
1494 if (*fi->getDefault != NULL) {
1495 return (*fi->getDefault)(type,
1496 index, start, buf, buflen);
1497 }
1498 break;
1499 }
1500 default:
1501 panic("%s", __func__);
1502 }
1503
1504 /* Default to element type default */
1505 etype = ng_get_composite_etype(type, index, ctype);
1506 func = METHOD(etype, getDefault);
1507 if (func == NULL)
1508 return (EOPNOTSUPP);
1509 return (*func)(etype, start, buf, buflen);
1510 }
1511
1512 /*
1513 * Get the number of elements in a struct, variable or fixed array.
1514 */
1515 static int
1516 ng_get_composite_len(const struct ng_parse_type *type,
1517 const u_char *const start, const u_char *buf,
1518 const enum comptype ctype)
1519 {
1520 switch (ctype) {
1521 case CT_STRUCT:
1522 {
1523 const struct ng_parse_struct_field *const fields = type->info;
1524 int numFields = 0;
1525
1526 for (numFields = 0; ; numFields++) {
1527 const struct ng_parse_struct_field *const
1528 fi = &fields[numFields];
1529
1530 if (fi->name == NULL)
1531 break;
1532 }
1533 return (numFields);
1534 }
1535 case CT_ARRAY:
1536 {
1537 const struct ng_parse_array_info *const ai = type->info;
1538
1539 return (*ai->getLength)(type, start, buf);
1540 }
1541 case CT_FIXEDARRAY:
1542 {
1543 const struct ng_parse_fixedarray_info *const fi = type->info;
1544
1545 return fi->length;
1546 }
1547 default:
1548 panic("%s", __func__);
1549 }
1550 return (0);
1551 }
1552
1553 /*
1554 * Return the type of the index'th element of a composite structure
1555 */
1556 static const struct ng_parse_type *
1557 ng_get_composite_etype(const struct ng_parse_type *type,
1558 int index, const enum comptype ctype)
1559 {
1560 const struct ng_parse_type *etype = NULL;
1561
1562 switch (ctype) {
1563 case CT_STRUCT:
1564 {
1565 const struct ng_parse_struct_field *const fields = type->info;
1566
1567 etype = fields[index].type;
1568 break;
1569 }
1570 case CT_ARRAY:
1571 {
1572 const struct ng_parse_array_info *const ai = type->info;
1573
1574 etype = ai->elementType;
1575 break;
1576 }
1577 case CT_FIXEDARRAY:
1578 {
1579 const struct ng_parse_fixedarray_info *const fi = type->info;
1580
1581 etype = fi->elementType;
1582 break;
1583 }
1584 default:
1585 panic("%s", __func__);
1586 }
1587 return (etype);
1588 }
1589
1590 /*
1591 * Get the number of bytes to skip to align for the next
1592 * element in a composite structure.
1593 */
1594 static int
1595 ng_parse_get_elem_pad(const struct ng_parse_type *type,
1596 int index, enum comptype ctype, int posn)
1597 {
1598 const struct ng_parse_type *const
1599 etype = ng_get_composite_etype(type, index, ctype);
1600 int align;
1601
1602 /* Get element's alignment, and possibly override */
1603 align = ALIGNMENT(etype);
1604 if (ctype == CT_STRUCT) {
1605 const struct ng_parse_struct_field *const fields = type->info;
1606
1607 if (fields[index].alignment != 0)
1608 align = fields[index].alignment;
1609 }
1610
1611 /* Return number of bytes to skip to align */
1612 return (align ? (align - (posn % align)) % align : 0);
1613 }
1614
1615 /************************************************************************
1616 PARSING HELPER ROUTINES
1617 ************************************************************************/
1618
1619 /*
1620 * Append to a fixed length string buffer.
1621 */
1622 static int
1623 ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...)
1624 {
1625 va_list args;
1626 int len;
1627
1628 va_start(args, fmt);
1629 len = vsnprintf(*cbufp, *cbuflenp, fmt, args);
1630 va_end(args);
1631 if (len >= *cbuflenp)
1632 return ERANGE;
1633 *cbufp += len;
1634 *cbuflenp -= len;
1635
1636 return (0);
1637 }
1638
1639 /*
1640 * Skip over a value
1641 */
1642 static int
1643 ng_parse_skip_value(const char *s, int off0, int *lenp)
1644 {
1645 int len, nbracket, nbrace;
1646 int off = off0;
1647
1648 len = nbracket = nbrace = 0;
1649 do {
1650 switch (ng_parse_get_token(s, &off, &len)) {
1651 case T_LBRACKET:
1652 nbracket++;
1653 break;
1654 case T_LBRACE:
1655 nbrace++;
1656 break;
1657 case T_RBRACKET:
1658 if (nbracket-- == 0)
1659 return (EINVAL);
1660 break;
1661 case T_RBRACE:
1662 if (nbrace-- == 0)
1663 return (EINVAL);
1664 break;
1665 case T_EOF:
1666 return (EINVAL);
1667 default:
1668 break;
1669 }
1670 off += len;
1671 } while (nbracket > 0 || nbrace > 0);
1672 *lenp = off - off0;
1673 return (0);
1674 }
1675
1676 /*
1677 * Find the next token in the string, starting at offset *startp.
1678 * Returns the token type, with *startp pointing to the first char
1679 * and *lenp the length.
1680 */
1681 enum ng_parse_token
1682 ng_parse_get_token(const char *s, int *startp, int *lenp)
1683 {
1684 char *t;
1685 int i;
1686
1687 while (isspace(s[*startp]))
1688 (*startp)++;
1689 switch (s[*startp]) {
1690 case '\0':
1691 *lenp = 0;
1692 return T_EOF;
1693 case '{':
1694 *lenp = 1;
1695 return T_LBRACE;
1696 case '}':
1697 *lenp = 1;
1698 return T_RBRACE;
1699 case '[':
1700 *lenp = 1;
1701 return T_LBRACKET;
1702 case ']':
1703 *lenp = 1;
1704 return T_RBRACKET;
1705 case '=':
1706 *lenp = 1;
1707 return T_EQUALS;
1708 case '"':
1709 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL)
1710 return T_ERROR;
1711 free(t, M_NETGRAPH_PARSE);
1712 return T_STRING;
1713 default:
1714 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i])
1715 && s[i] != '{' && s[i] != '}' && s[i] != '['
1716 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++)
1717 ;
1718 *lenp = i - *startp;
1719 return T_WORD;
1720 }
1721 }
1722
1723 /*
1724 * Get a string token, which must be enclosed in double quotes.
1725 * The normal C backslash escapes are recognized.
1726 */
1727 char *
1728 ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp)
1729 {
1730 char *cbuf, *p;
1731 int start, off;
1732 int slen;
1733
1734 while (isspace(s[*startp]))
1735 (*startp)++;
1736 start = *startp;
1737 if (s[*startp] != '"')
1738 return (NULL);
1739 cbuf = malloc(strlen(s + start), M_NETGRAPH_PARSE, M_NOWAIT);
1740 if (cbuf == NULL)
1741 return (NULL);
1742 strcpy(cbuf, s + start + 1);
1743 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) {
1744 if (*p == '"') {
1745 *p = '\0';
1746 *lenp = off + 1;
1747 if (slenp != NULL)
1748 *slenp = slen;
1749 return (cbuf);
1750 } else if (p[0] == '\\' && p[1] != '\0') {
1751 int x, k;
1752 char *v;
1753
1754 strcpy(p, p + 1);
1755 v = p;
1756 switch (*p) {
1757 case 't':
1758 *v = '\t';
1759 off++;
1760 continue;
1761 case 'n':
1762 *v = '\n';
1763 off++;
1764 continue;
1765 case 'r':
1766 *v = '\r';
1767 off++;
1768 continue;
1769 case 'v':
1770 *v = '\v';
1771 off++;
1772 continue;
1773 case 'f':
1774 *v = '\f';
1775 off++;
1776 continue;
1777 case '"':
1778 *v = '"';
1779 off++;
1780 continue;
1781 case '': case '1': case '2': case '3':
1782 case '4': case '5': case '6': case '7':
1783 for (x = k = 0;
1784 k < 3 && *v >= '' && *v <= '7'; v++) {
1785 x = (x << 3) + (*v - '');
1786 off++;
1787 }
1788 *--v = (char)x;
1789 break;
1790 case 'x':
1791 for (v++, x = k = 0;
1792 k < 2 && isxdigit(*v); v++) {
1793 x = (x << 4) + (isdigit(*v) ?
1794 (*v - '') :
1795 (tolower(*v) - 'a' + 10));
1796 off++;
1797 }
1798 *--v = (char)x;
1799 break;
1800 default:
1801 continue;
1802 }
1803 strcpy(p, v);
1804 }
1805 }
1806 free(cbuf, M_NETGRAPH_PARSE);
1807 return (NULL); /* no closing quote */
1808 }
1809
1810 /*
1811 * Encode a string so it can be safely put in double quotes.
1812 * Caller must free the result. Exactly "slen" characters
1813 * are encoded.
1814 */
1815 char *
1816 ng_encode_string(const char *raw, int slen)
1817 {
1818 char *cbuf;
1819 int off = 0;
1820 int i;
1821
1822 cbuf = malloc(strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, M_NOWAIT);
1823 if (cbuf == NULL)
1824 return (NULL);
1825 cbuf[off++] = '"';
1826 for (i = 0; i < slen; i++, raw++) {
1827 switch (*raw) {
1828 case '\t':
1829 cbuf[off++] = '\\';
1830 cbuf[off++] = 't';
1831 break;
1832 case '\f':
1833 cbuf[off++] = '\\';
1834 cbuf[off++] = 'f';
1835 break;
1836 case '\n':
1837 cbuf[off++] = '\\';
1838 cbuf[off++] = 'n';
1839 break;
1840 case '\r':
1841 cbuf[off++] = '\\';
1842 cbuf[off++] = 'r';
1843 break;
1844 case '\v':
1845 cbuf[off++] = '\\';
1846 cbuf[off++] = 'v';
1847 break;
1848 case '"':
1849 case '\\':
1850 cbuf[off++] = '\\';
1851 cbuf[off++] = *raw;
1852 break;
1853 default:
1854 if (*raw < 0x20 || *raw > 0x7e) {
1855 off += sprintf(cbuf + off,
1856 "\\x%02x", (u_char)*raw);
1857 break;
1858 }
1859 cbuf[off++] = *raw;
1860 break;
1861 }
1862 }
1863 cbuf[off++] = '"';
1864 cbuf[off] = '\0';
1865 return (cbuf);
1866 }
1867
1868 /************************************************************************
1869 VIRTUAL METHOD LOOKUP
1870 ************************************************************************/
1871
1872 static ng_parse_t *
1873 ng_get_parse_method(const struct ng_parse_type *t)
1874 {
1875 while (t != NULL && t->parse == NULL)
1876 t = t->supertype;
1877 return (t ? t->parse : NULL);
1878 }
1879
1880 static ng_unparse_t *
1881 ng_get_unparse_method(const struct ng_parse_type *t)
1882 {
1883 while (t != NULL && t->unparse == NULL)
1884 t = t->supertype;
1885 return (t ? t->unparse : NULL);
1886 }
1887
1888 static ng_getDefault_t *
1889 ng_get_getDefault_method(const struct ng_parse_type *t)
1890 {
1891 while (t != NULL && t->getDefault == NULL)
1892 t = t->supertype;
1893 return (t ? t->getDefault : NULL);
1894 }
1895
1896 static ng_getAlign_t *
1897 ng_get_getAlign_method(const struct ng_parse_type *t)
1898 {
1899 while (t != NULL && t->getAlign == NULL)
1900 t = t->supertype;
1901 return (t ? t->getAlign : NULL);
1902 }
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