ng_parse.c revision 142902
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: head/sys/netgraph/ng_parse.c 142902 2005-03-01 11:31:06Z glebius $ 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/malloc.h> 50#include <sys/mbuf.h> 51#include <sys/ctype.h> 52 53#include <machine/stdarg.h> 54 55#include <net/ethernet.h> 56 57#include <netinet/in.h> 58 59#include <netgraph/ng_message.h> 60#include <netgraph/netgraph.h> 61#include <netgraph/ng_parse.h> 62 63#ifdef NG_SEPARATE_MALLOC 64MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info"); 65#else 66#define M_NETGRAPH_PARSE M_NETGRAPH 67#endif 68 69/* Compute alignment for primitive integral types */ 70struct int16_temp { 71 char x; 72 int16_t y; 73}; 74 75struct int32_temp { 76 char x; 77 int32_t y; 78}; 79 80struct int64_temp { 81 char x; 82 int64_t y; 83}; 84 85#define INT8_ALIGNMENT 1 86#define INT16_ALIGNMENT ((int)&((struct int16_temp *)0)->y) 87#define INT32_ALIGNMENT ((int)&((struct int32_temp *)0)->y) 88#define INT64_ALIGNMENT ((int)&((struct int64_temp *)0)->y) 89 90/* Output format for integral types */ 91#define INT_UNSIGNED 0 92#define INT_SIGNED 1 93#define INT_HEX 2 94 95/* Type of composite object: struct, array, or fixedarray */ 96enum comptype { 97 CT_STRUCT, 98 CT_ARRAY, 99 CT_FIXEDARRAY, 100}; 101 102/* Composite types helper functions */ 103static int ng_parse_composite(const struct ng_parse_type *type, 104 const char *s, int *off, const u_char *start, 105 u_char *const buf, int *buflen, enum comptype ctype); 106static int ng_unparse_composite(const struct ng_parse_type *type, 107 const u_char *data, int *off, char *cbuf, int cbuflen, 108 enum comptype ctype); 109static int ng_get_composite_elem_default(const struct ng_parse_type *type, 110 int index, const u_char *start, u_char *buf, 111 int *buflen, enum comptype ctype); 112static int ng_get_composite_len(const struct ng_parse_type *type, 113 const u_char *start, const u_char *buf, 114 enum comptype ctype); 115static const struct ng_parse_type *ng_get_composite_etype(const struct 116 ng_parse_type *type, int index, enum comptype ctype); 117static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 118 int index, enum comptype ctype, int posn); 119 120/* Parsing helper functions */ 121static int ng_parse_skip_value(const char *s, int off, int *lenp); 122static int ng_parse_append(char **cbufp, int *cbuflenp, 123 const char *fmt, ...); 124 125/* Poor man's virtual method calls */ 126#define METHOD(t,m) (ng_get_ ## m ## _method(t)) 127#define INVOKE(t,m) (*METHOD(t,m)) 128 129static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 130static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 131static ng_getDefault_t *ng_get_getDefault_method(const 132 struct ng_parse_type *t); 133static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 134 135#define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 136 0 : INVOKE(t, getAlign)(t)) 137 138/************************************************************************ 139 PUBLIC FUNCTIONS 140 ************************************************************************/ 141 142/* 143 * Convert an ASCII string to binary according to the supplied type descriptor 144 */ 145int 146ng_parse(const struct ng_parse_type *type, 147 const char *string, int *off, u_char *buf, int *buflen) 148{ 149 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 150} 151 152/* 153 * Convert binary to an ASCII string according to the supplied type descriptor 154 */ 155int 156ng_unparse(const struct ng_parse_type *type, 157 const u_char *data, char *cbuf, int cbuflen) 158{ 159 int off = 0; 160 161 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 162} 163 164/* 165 * Fill in the default value according to the supplied type descriptor 166 */ 167int 168ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 169{ 170 ng_getDefault_t *const func = METHOD(type, getDefault); 171 172 if (func == NULL) 173 return (EOPNOTSUPP); 174 return (*func)(type, buf, buf, buflen); 175} 176 177 178/************************************************************************ 179 STRUCTURE TYPE 180 ************************************************************************/ 181 182static int 183ng_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 190static int 191ng_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 197static int 198ng_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 207static int 208ng_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 222const 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 236static int 237ng_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 245static int 246ng_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 253static int 254ng_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 263static int 264ng_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 271const 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 285static int 286ng_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 293static int 294ng_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 300static int 301ng_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 310static int 311ng_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 318const 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 332static int 333ng_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 351static int 352ng_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#ifdef RESTARTABLE_PANICS 377 return(0); 378#endif 379 } 380 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 381 return (error); 382 *off += sizeof(int8_t); 383 return (0); 384} 385 386static int 387ng_int8_getDefault(const struct ng_parse_type *type, 388 const u_char *const start, u_char *buf, int *buflen) 389{ 390 int8_t val; 391 392 if (*buflen < sizeof(int8_t)) 393 return (ERANGE); 394 val = 0; 395 bcopy(&val, buf, sizeof(int8_t)); 396 *buflen = sizeof(int8_t); 397 return (0); 398} 399 400static int 401ng_int8_getAlign(const struct ng_parse_type *type) 402{ 403 return INT8_ALIGNMENT; 404} 405 406const struct ng_parse_type ng_parse_int8_type = { 407 NULL, 408 (void *)INT_SIGNED, 409 NULL, 410 ng_int8_parse, 411 ng_int8_unparse, 412 ng_int8_getDefault, 413 ng_int8_getAlign 414}; 415 416const struct ng_parse_type ng_parse_uint8_type = { 417 &ng_parse_int8_type, 418 (void *)INT_UNSIGNED 419}; 420 421const struct ng_parse_type ng_parse_hint8_type = { 422 &ng_parse_int8_type, 423 (void *)INT_HEX 424}; 425 426/************************************************************************ 427 INT16 TYPE 428 ************************************************************************/ 429 430static int 431ng_int16_parse(const struct ng_parse_type *type, 432 const char *s, int *off, const u_char *const start, 433 u_char *const buf, int *buflen) 434{ 435 long val; 436 int16_t val16; 437 char *eptr; 438 439 val = strtol(s + *off, &eptr, 0); 440 if (val < (int16_t)0x8000 441 || val > (u_int16_t)0xffff || eptr == s + *off) 442 return (EINVAL); 443 *off = eptr - s; 444 val16 = (int16_t)val; 445 bcopy(&val16, buf, sizeof(int16_t)); 446 *buflen = sizeof(int16_t); 447 return (0); 448} 449 450static int 451ng_int16_unparse(const struct ng_parse_type *type, 452 const u_char *data, int *off, char *cbuf, int cbuflen) 453{ 454 const char *fmt; 455 int fval; 456 int error; 457 int16_t val; 458 459 bcopy(data + *off, &val, sizeof(int16_t)); 460 switch ((intptr_t)type->info) { 461 case INT_SIGNED: 462 fmt = "%d"; 463 fval = val; 464 break; 465 case INT_UNSIGNED: 466 fmt = "%u"; 467 fval = (u_int16_t)val; 468 break; 469 case INT_HEX: 470 fmt = "0x%x"; 471 fval = (u_int16_t)val; 472 break; 473 default: 474 panic("%s: unknown type", __func__); 475#ifdef RESTARTABLE_PANICS 476 return(0); 477#endif 478 } 479 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 480 return (error); 481 *off += sizeof(int16_t); 482 return (0); 483} 484 485static int 486ng_int16_getDefault(const struct ng_parse_type *type, 487 const u_char *const start, u_char *buf, int *buflen) 488{ 489 int16_t val; 490 491 if (*buflen < sizeof(int16_t)) 492 return (ERANGE); 493 val = 0; 494 bcopy(&val, buf, sizeof(int16_t)); 495 *buflen = sizeof(int16_t); 496 return (0); 497} 498 499static int 500ng_int16_getAlign(const struct ng_parse_type *type) 501{ 502 return INT16_ALIGNMENT; 503} 504 505const struct ng_parse_type ng_parse_int16_type = { 506 NULL, 507 (void *)INT_SIGNED, 508 NULL, 509 ng_int16_parse, 510 ng_int16_unparse, 511 ng_int16_getDefault, 512 ng_int16_getAlign 513}; 514 515const struct ng_parse_type ng_parse_uint16_type = { 516 &ng_parse_int16_type, 517 (void *)INT_UNSIGNED 518}; 519 520const struct ng_parse_type ng_parse_hint16_type = { 521 &ng_parse_int16_type, 522 (void *)INT_HEX 523}; 524 525/************************************************************************ 526 INT32 TYPE 527 ************************************************************************/ 528 529static int 530ng_int32_parse(const struct ng_parse_type *type, 531 const char *s, int *off, const u_char *const start, 532 u_char *const buf, int *buflen) 533{ 534 long val; /* assumes long is at least 32 bits */ 535 int32_t val32; 536 char *eptr; 537 538 val = strtol(s + *off, &eptr, 0); 539 if (val < (int32_t)0x80000000 540 || val > (u_int32_t)0xffffffff || eptr == s + *off) 541 return (EINVAL); 542 *off = eptr - s; 543 val32 = (int32_t)val; 544 bcopy(&val32, buf, sizeof(int32_t)); 545 *buflen = sizeof(int32_t); 546 return (0); 547} 548 549static int 550ng_int32_unparse(const struct ng_parse_type *type, 551 const u_char *data, int *off, char *cbuf, int cbuflen) 552{ 553 const char *fmt; 554 long fval; 555 int error; 556 int32_t val; 557 558 bcopy(data + *off, &val, sizeof(int32_t)); 559 switch ((intptr_t)type->info) { 560 case INT_SIGNED: 561 fmt = "%ld"; 562 fval = val; 563 break; 564 case INT_UNSIGNED: 565 fmt = "%lu"; 566 fval = (u_int32_t)val; 567 break; 568 case INT_HEX: 569 fmt = "0x%lx"; 570 fval = (u_int32_t)val; 571 break; 572 default: 573 panic("%s: unknown type", __func__); 574#ifdef RESTARTABLE_PANICS 575 return(0); 576#endif 577 } 578 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 579 return (error); 580 *off += sizeof(int32_t); 581 return (0); 582} 583 584static int 585ng_int32_getDefault(const struct ng_parse_type *type, 586 const u_char *const start, u_char *buf, int *buflen) 587{ 588 int32_t val; 589 590 if (*buflen < sizeof(int32_t)) 591 return (ERANGE); 592 val = 0; 593 bcopy(&val, buf, sizeof(int32_t)); 594 *buflen = sizeof(int32_t); 595 return (0); 596} 597 598static int 599ng_int32_getAlign(const struct ng_parse_type *type) 600{ 601 return INT32_ALIGNMENT; 602} 603 604const struct ng_parse_type ng_parse_int32_type = { 605 NULL, 606 (void *)INT_SIGNED, 607 NULL, 608 ng_int32_parse, 609 ng_int32_unparse, 610 ng_int32_getDefault, 611 ng_int32_getAlign 612}; 613 614const struct ng_parse_type ng_parse_uint32_type = { 615 &ng_parse_int32_type, 616 (void *)INT_UNSIGNED 617}; 618 619const struct ng_parse_type ng_parse_hint32_type = { 620 &ng_parse_int32_type, 621 (void *)INT_HEX 622}; 623 624/************************************************************************ 625 INT64 TYPE 626 ************************************************************************/ 627 628static int 629ng_int64_parse(const struct ng_parse_type *type, 630 const char *s, int *off, const u_char *const start, 631 u_char *const buf, int *buflen) 632{ 633 quad_t val; 634 int64_t val64; 635 char *eptr; 636 637 val = strtoq(s + *off, &eptr, 0); 638 if (eptr == s + *off) 639 return (EINVAL); 640 *off = eptr - s; 641 val64 = (int64_t)val; 642 bcopy(&val64, buf, sizeof(int64_t)); 643 *buflen = sizeof(int64_t); 644 return (0); 645} 646 647static int 648ng_int64_unparse(const struct ng_parse_type *type, 649 const u_char *data, int *off, char *cbuf, int cbuflen) 650{ 651 const char *fmt; 652 long long fval; 653 int64_t val; 654 int error; 655 656 bcopy(data + *off, &val, sizeof(int64_t)); 657 switch ((intptr_t)type->info) { 658 case INT_SIGNED: 659 fmt = "%lld"; 660 fval = val; 661 break; 662 case INT_UNSIGNED: 663 fmt = "%llu"; 664 fval = (u_int64_t)val; 665 break; 666 case INT_HEX: 667 fmt = "0x%llx"; 668 fval = (u_int64_t)val; 669 break; 670 default: 671 panic("%s: unknown type", __func__); 672#ifdef RESTARTABLE_PANICS 673 return(0); 674#endif 675 } 676 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 677 return (error); 678 *off += sizeof(int64_t); 679 return (0); 680} 681 682static int 683ng_int64_getDefault(const struct ng_parse_type *type, 684 const u_char *const start, u_char *buf, int *buflen) 685{ 686 int64_t val; 687 688 if (*buflen < sizeof(int64_t)) 689 return (ERANGE); 690 val = 0; 691 bcopy(&val, buf, sizeof(int64_t)); 692 *buflen = sizeof(int64_t); 693 return (0); 694} 695 696static int 697ng_int64_getAlign(const struct ng_parse_type *type) 698{ 699 return INT64_ALIGNMENT; 700} 701 702const struct ng_parse_type ng_parse_int64_type = { 703 NULL, 704 (void *)INT_SIGNED, 705 NULL, 706 ng_int64_parse, 707 ng_int64_unparse, 708 ng_int64_getDefault, 709 ng_int64_getAlign 710}; 711 712const struct ng_parse_type ng_parse_uint64_type = { 713 &ng_parse_int64_type, 714 (void *)INT_UNSIGNED 715}; 716 717const struct ng_parse_type ng_parse_hint64_type = { 718 &ng_parse_int64_type, 719 (void *)INT_HEX 720}; 721 722/************************************************************************ 723 STRING TYPE 724 ************************************************************************/ 725 726static int 727ng_string_parse(const struct ng_parse_type *type, 728 const char *s, int *off, const u_char *const start, 729 u_char *const buf, int *buflen) 730{ 731 char *sval; 732 int len; 733 int slen; 734 735 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 736 return (EINVAL); 737 *off += len; 738 bcopy(sval, buf, slen + 1); 739 FREE(sval, M_NETGRAPH_PARSE); 740 *buflen = slen + 1; 741 return (0); 742} 743 744static int 745ng_string_unparse(const struct ng_parse_type *type, 746 const u_char *data, int *off, char *cbuf, int cbuflen) 747{ 748 const char *const raw = (const char *)data + *off; 749 char *const s = ng_encode_string(raw, strlen(raw)); 750 int error; 751 752 if (s == NULL) 753 return (ENOMEM); 754 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 755 FREE(s, M_NETGRAPH_PARSE); 756 return (error); 757 } 758 *off += strlen(raw) + 1; 759 FREE(s, M_NETGRAPH_PARSE); 760 return (0); 761} 762 763static int 764ng_string_getDefault(const struct ng_parse_type *type, 765 const u_char *const start, u_char *buf, int *buflen) 766{ 767 768 if (*buflen < 1) 769 return (ERANGE); 770 buf[0] = (u_char)'\0'; 771 *buflen = 1; 772 return (0); 773} 774 775const struct ng_parse_type ng_parse_string_type = { 776 NULL, 777 NULL, 778 NULL, 779 ng_string_parse, 780 ng_string_unparse, 781 ng_string_getDefault, 782 NULL 783}; 784 785/************************************************************************ 786 FIXED BUFFER STRING TYPE 787 ************************************************************************/ 788 789static int 790ng_fixedstring_parse(const struct ng_parse_type *type, 791 const char *s, int *off, const u_char *const start, 792 u_char *const buf, int *buflen) 793{ 794 const struct ng_parse_fixedstring_info *const fi = type->info; 795 char *sval; 796 int len; 797 int slen; 798 799 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 800 return (EINVAL); 801 if (slen + 1 > fi->bufSize) 802 return (E2BIG); 803 *off += len; 804 bcopy(sval, buf, slen); 805 FREE(sval, M_NETGRAPH_PARSE); 806 bzero(buf + slen, fi->bufSize - slen); 807 *buflen = fi->bufSize; 808 return (0); 809} 810 811static int 812ng_fixedstring_unparse(const struct ng_parse_type *type, 813 const u_char *data, int *off, char *cbuf, int cbuflen) 814{ 815 const struct ng_parse_fixedstring_info *const fi = type->info; 816 int error, temp = *off; 817 818 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 819 return (error); 820 *off += fi->bufSize; 821 return (0); 822} 823 824static int 825ng_fixedstring_getDefault(const struct ng_parse_type *type, 826 const u_char *const start, u_char *buf, int *buflen) 827{ 828 const struct ng_parse_fixedstring_info *const fi = type->info; 829 830 if (*buflen < fi->bufSize) 831 return (ERANGE); 832 bzero(buf, fi->bufSize); 833 *buflen = fi->bufSize; 834 return (0); 835} 836 837const struct ng_parse_type ng_parse_fixedstring_type = { 838 NULL, 839 NULL, 840 NULL, 841 ng_fixedstring_parse, 842 ng_fixedstring_unparse, 843 ng_fixedstring_getDefault, 844 NULL 845}; 846 847const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 848 NG_NODESIZ 849}; 850const struct ng_parse_type ng_parse_nodebuf_type = { 851 &ng_parse_fixedstring_type, 852 &ng_parse_nodebuf_info 853}; 854 855const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 856 NG_HOOKSIZ 857}; 858const struct ng_parse_type ng_parse_hookbuf_type = { 859 &ng_parse_fixedstring_type, 860 &ng_parse_hookbuf_info 861}; 862 863const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 864 NG_PATHSIZ 865}; 866const struct ng_parse_type ng_parse_pathbuf_type = { 867 &ng_parse_fixedstring_type, 868 &ng_parse_pathbuf_info 869}; 870 871const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 872 NG_TYPESIZ 873}; 874const struct ng_parse_type ng_parse_typebuf_type = { 875 &ng_parse_fixedstring_type, 876 &ng_parse_typebuf_info 877}; 878 879const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 880 NG_CMDSTRSIZ 881}; 882const struct ng_parse_type ng_parse_cmdbuf_type = { 883 &ng_parse_fixedstring_type, 884 &ng_parse_cmdbuf_info 885}; 886 887/************************************************************************ 888 EXPLICITLY SIZED STRING TYPE 889 ************************************************************************/ 890 891static int 892ng_sizedstring_parse(const struct ng_parse_type *type, 893 const char *s, int *off, const u_char *const start, 894 u_char *const buf, int *buflen) 895{ 896 char *sval; 897 int len; 898 int slen; 899 900 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 901 return (EINVAL); 902 if (slen > 0xffff) 903 return (EINVAL); 904 *off += len; 905 *((u_int16_t *)buf) = (u_int16_t)slen; 906 bcopy(sval, buf + 2, slen); 907 FREE(sval, M_NETGRAPH_PARSE); 908 *buflen = 2 + slen; 909 return (0); 910} 911 912static int 913ng_sizedstring_unparse(const struct ng_parse_type *type, 914 const u_char *data, int *off, char *cbuf, int cbuflen) 915{ 916 const char *const raw = (const char *)data + *off + 2; 917 const int slen = *((const u_int16_t *)(data + *off)); 918 char *const s = ng_encode_string(raw, slen); 919 int error; 920 921 if (s == NULL) 922 return (ENOMEM); 923 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 924 FREE(s, M_NETGRAPH_PARSE); 925 return (error); 926 } 927 FREE(s, M_NETGRAPH_PARSE); 928 *off += slen + 2; 929 return (0); 930} 931 932static int 933ng_sizedstring_getDefault(const struct ng_parse_type *type, 934 const u_char *const start, u_char *buf, int *buflen) 935{ 936 if (*buflen < 2) 937 return (ERANGE); 938 bzero(buf, 2); 939 *buflen = 2; 940 return (0); 941} 942 943const struct ng_parse_type ng_parse_sizedstring_type = { 944 NULL, 945 NULL, 946 NULL, 947 ng_sizedstring_parse, 948 ng_sizedstring_unparse, 949 ng_sizedstring_getDefault, 950 NULL 951}; 952 953/************************************************************************ 954 IP ADDRESS TYPE 955 ************************************************************************/ 956 957static int 958ng_ipaddr_parse(const struct ng_parse_type *type, 959 const char *s, int *off, const u_char *const start, 960 u_char *const buf, int *buflen) 961{ 962 int i, error; 963 964 for (i = 0; i < 4; i++) { 965 if ((error = ng_int8_parse(&ng_parse_int8_type, 966 s, off, start, buf + i, buflen)) != 0) 967 return (error); 968 if (i < 3 && s[*off] != '.') 969 return (EINVAL); 970 (*off)++; 971 } 972 *buflen = 4; 973 return (0); 974} 975 976static int 977ng_ipaddr_unparse(const struct ng_parse_type *type, 978 const u_char *data, int *off, char *cbuf, int cbuflen) 979{ 980 struct in_addr ip; 981 int error; 982 983 bcopy(data + *off, &ip, sizeof(ip)); 984 if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d", 985 ((u_char *)&ip)[0], ((u_char *)&ip)[1], 986 ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0) 987 return (error); 988 *off += sizeof(ip); 989 return (0); 990} 991 992static int 993ng_ipaddr_getDefault(const struct ng_parse_type *type, 994 const u_char *const start, u_char *buf, int *buflen) 995{ 996 struct in_addr ip = { 0 }; 997 998 if (*buflen < sizeof(ip)) 999 return (ERANGE); 1000 bcopy(&ip, buf, sizeof(ip)); 1001 *buflen = sizeof(ip); 1002 return (0); 1003} 1004 1005const struct ng_parse_type ng_parse_ipaddr_type = { 1006 NULL, 1007 NULL, 1008 NULL, 1009 ng_ipaddr_parse, 1010 ng_ipaddr_unparse, 1011 ng_ipaddr_getDefault, 1012 ng_int32_getAlign 1013}; 1014 1015/************************************************************************ 1016 ETHERNET ADDRESS TYPE 1017 ************************************************************************/ 1018 1019static int 1020ng_enaddr_parse(const struct ng_parse_type *type, 1021 const char *s, int *const off, const u_char *const start, 1022 u_char *const buf, int *const buflen) 1023{ 1024 char *eptr; 1025 u_long val; 1026 int i; 1027 1028 if (*buflen < ETHER_ADDR_LEN) 1029 return (ERANGE); 1030 for (i = 0; i < ETHER_ADDR_LEN; i++) { 1031 val = strtoul(s + *off, &eptr, 16); 1032 if (val > 0xff || eptr == s + *off) 1033 return (EINVAL); 1034 buf[i] = (u_char)val; 1035 *off = (eptr - s); 1036 if (i < ETHER_ADDR_LEN - 1) { 1037 if (*eptr != ':') 1038 return (EINVAL); 1039 (*off)++; 1040 } 1041 } 1042 *buflen = ETHER_ADDR_LEN; 1043 return (0); 1044} 1045 1046static int 1047ng_enaddr_unparse(const struct ng_parse_type *type, 1048 const u_char *data, int *off, char *cbuf, int cbuflen) 1049{ 1050 int len; 1051 1052 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 1053 data[*off], data[*off + 1], data[*off + 2], 1054 data[*off + 3], data[*off + 4], data[*off + 5]); 1055 if (len >= cbuflen) 1056 return (ERANGE); 1057 *off += ETHER_ADDR_LEN; 1058 return (0); 1059} 1060 1061const struct ng_parse_type ng_parse_enaddr_type = { 1062 NULL, 1063 NULL, 1064 NULL, 1065 ng_enaddr_parse, 1066 ng_enaddr_unparse, 1067 NULL, 1068 0 1069}; 1070 1071/************************************************************************ 1072 BYTE ARRAY TYPE 1073 ************************************************************************/ 1074 1075/* Get the length of a byte array */ 1076static int 1077ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type, 1078 const u_char *start, const u_char *buf) 1079{ 1080 ng_parse_array_getLength_t *const getLength = type->private; 1081 1082 return (*getLength)(type, start, buf); 1083} 1084 1085/* Byte array element type is hex int8 */ 1086static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = { 1087 &ng_parse_hint8_type, 1088 &ng_parse_bytearray_subtype_getLength, 1089 NULL 1090}; 1091static const struct ng_parse_type ng_parse_bytearray_subtype = { 1092 &ng_parse_array_type, 1093 &ng_parse_bytearray_subtype_info 1094}; 1095 1096static int 1097ng_bytearray_parse(const struct ng_parse_type *type, 1098 const char *s, int *off, const u_char *const start, 1099 u_char *const buf, int *buflen) 1100{ 1101 char *str; 1102 int toklen; 1103 int slen; 1104 1105 /* We accept either an array of bytes or a string constant */ 1106 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) { 1107 ng_parse_array_getLength_t *const getLength = type->info; 1108 int arraylen; 1109 1110 arraylen = (*getLength)(type, start, buf); 1111 if (arraylen > *buflen) { 1112 FREE(str, M_NETGRAPH_PARSE); 1113 return (ERANGE); 1114 } 1115 if (slen > arraylen) { 1116 FREE(str, M_NETGRAPH_PARSE); 1117 return (E2BIG); 1118 } 1119 bcopy(str, buf, slen); 1120 bzero(buf + slen, arraylen - slen); 1121 FREE(str, M_NETGRAPH_PARSE); 1122 *off += toklen; 1123 *buflen = arraylen; 1124 return (0); 1125 } else { 1126 struct ng_parse_type subtype; 1127 1128 subtype = ng_parse_bytearray_subtype; 1129 *(const void **)&subtype.private = type->info; 1130 return ng_array_parse(&subtype, s, off, start, buf, buflen); 1131 } 1132} 1133 1134static int 1135ng_bytearray_unparse(const struct ng_parse_type *type, 1136 const u_char *data, int *off, char *cbuf, int cbuflen) 1137{ 1138 struct ng_parse_type subtype; 1139 1140 subtype = ng_parse_bytearray_subtype; 1141 *(const void **)&subtype.private = type->info; 1142 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen); 1143} 1144 1145static int 1146ng_bytearray_getDefault(const struct ng_parse_type *type, 1147 const u_char *const start, u_char *buf, int *buflen) 1148{ 1149 struct ng_parse_type subtype; 1150 1151 subtype = ng_parse_bytearray_subtype; 1152 *(const void **)&subtype.private = type->info; 1153 return ng_array_getDefault(&subtype, start, buf, buflen); 1154} 1155 1156const struct ng_parse_type ng_parse_bytearray_type = { 1157 NULL, 1158 NULL, 1159 NULL, 1160 ng_bytearray_parse, 1161 ng_bytearray_unparse, 1162 ng_bytearray_getDefault, 1163 NULL 1164}; 1165 1166/************************************************************************ 1167 STRUCT NG_MESG TYPE 1168 ************************************************************************/ 1169 1170/* Get msg->header.arglen when "buf" is pointing to msg->data */ 1171static int 1172ng_parse_ng_mesg_getLength(const struct ng_parse_type *type, 1173 const u_char *start, const u_char *buf) 1174{ 1175 const struct ng_mesg *msg; 1176 1177 msg = (const struct ng_mesg *)(buf - sizeof(*msg)); 1178 return msg->header.arglen; 1179} 1180 1181/* Type for the variable length data portion of a struct ng_mesg */ 1182static const struct ng_parse_type ng_msg_data_type = { 1183 &ng_parse_bytearray_type, 1184 &ng_parse_ng_mesg_getLength 1185}; 1186 1187/* Type for the entire struct ng_mesg header with data section */ 1188static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1189 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1190const struct ng_parse_type ng_parse_ng_mesg_type = { 1191 &ng_parse_struct_type, 1192 &ng_parse_ng_mesg_type_fields, 1193}; 1194 1195/************************************************************************ 1196 COMPOSITE HELPER ROUTINES 1197 ************************************************************************/ 1198 1199/* 1200 * Convert a structure or array from ASCII to binary 1201 */ 1202static int 1203ng_parse_composite(const struct ng_parse_type *type, const char *s, 1204 int *off, const u_char *const start, u_char *const buf, int *buflen, 1205 const enum comptype ctype) 1206{ 1207 const int num = ng_get_composite_len(type, start, buf, ctype); 1208 int nextIndex = 0; /* next implicit array index */ 1209 u_int index; /* field or element index */ 1210 int *foff; /* field value offsets in string */ 1211 int align, len, blen, error = 0; 1212 1213 /* Initialize */ 1214 MALLOC(foff, int *, num * sizeof(*foff), M_NETGRAPH_PARSE, M_NOWAIT | M_ZERO); 1215 if (foff == NULL) { 1216 error = ENOMEM; 1217 goto done; 1218 } 1219 1220 /* Get opening brace/bracket */ 1221 if (ng_parse_get_token(s, off, &len) 1222 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) { 1223 error = EINVAL; 1224 goto done; 1225 } 1226 *off += len; 1227 1228 /* Get individual element value positions in the string */ 1229 for (;;) { 1230 enum ng_parse_token tok; 1231 1232 /* Check for closing brace/bracket */ 1233 tok = ng_parse_get_token(s, off, &len); 1234 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) { 1235 *off += len; 1236 break; 1237 } 1238 1239 /* For arrays, the 'name' (ie, index) is optional, so 1240 distinguish name from values by seeing if the next 1241 token is an equals sign */ 1242 if (ctype != CT_STRUCT) { 1243 int len2, off2; 1244 char *eptr; 1245 1246 /* If an opening brace/bracket, index is implied */ 1247 if (tok == T_LBRACE || tok == T_LBRACKET) { 1248 index = nextIndex++; 1249 goto gotIndex; 1250 } 1251 1252 /* Might be an index, might be a value, either way... */ 1253 if (tok != T_WORD) { 1254 error = EINVAL; 1255 goto done; 1256 } 1257 1258 /* If no equals sign follows, index is implied */ 1259 off2 = *off + len; 1260 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) { 1261 index = nextIndex++; 1262 goto gotIndex; 1263 } 1264 1265 /* Index was specified explicitly; parse it */ 1266 index = (u_int)strtoul(s + *off, &eptr, 0); 1267 if (index < 0 || eptr - (s + *off) != len) { 1268 error = EINVAL; 1269 goto done; 1270 } 1271 nextIndex = index + 1; 1272 *off += len + len2; 1273 } else { /* a structure field */ 1274 const struct ng_parse_struct_field *const 1275 fields = type->info; 1276 1277 /* Find the field by name (required) in field list */ 1278 if (tok != T_WORD) { 1279 error = EINVAL; 1280 goto done; 1281 } 1282 for (index = 0; index < num; index++) { 1283 const struct ng_parse_struct_field *const 1284 field = &fields[index]; 1285 1286 if (strncmp(&s[*off], field->name, len) == 0 1287 && field->name[len] == '\0') 1288 break; 1289 } 1290 if (index == num) { 1291 error = ENOENT; 1292 goto done; 1293 } 1294 *off += len; 1295 1296 /* Get equals sign */ 1297 if (ng_parse_get_token(s, off, &len) != T_EQUALS) { 1298 error = EINVAL; 1299 goto done; 1300 } 1301 *off += len; 1302 } 1303gotIndex: 1304 1305 /* Check array index */ 1306 if (index >= num) { 1307 error = E2BIG; 1308 goto done; 1309 } 1310 1311 /* Save value's position and skip over it for now */ 1312 if (foff[index] != 0) { 1313 error = EALREADY; /* duplicate */ 1314 goto done; 1315 } 1316 while (isspace(s[*off])) 1317 (*off)++; 1318 foff[index] = *off; 1319 if ((error = ng_parse_skip_value(s, *off, &len)) != 0) 1320 goto done; 1321 *off += len; 1322 } 1323 1324 /* Now build binary structure from supplied values and defaults */ 1325 for (blen = index = 0; index < num; index++) { 1326 const struct ng_parse_type *const 1327 etype = ng_get_composite_etype(type, index, ctype); 1328 int k, pad, vlen; 1329 1330 /* Zero-pad any alignment bytes */ 1331 pad = ng_parse_get_elem_pad(type, index, ctype, blen); 1332 for (k = 0; k < pad; k++) { 1333 if (blen >= *buflen) { 1334 error = ERANGE; 1335 goto done; 1336 } 1337 buf[blen++] = 0; 1338 } 1339 1340 /* Get value */ 1341 vlen = *buflen - blen; 1342 if (foff[index] == 0) { /* use default value */ 1343 error = ng_get_composite_elem_default(type, index, 1344 start, buf + blen, &vlen, ctype); 1345 } else { /* parse given value */ 1346 *off = foff[index]; 1347 error = INVOKE(etype, parse)(etype, 1348 s, off, start, buf + blen, &vlen); 1349 } 1350 if (error != 0) 1351 goto done; 1352 blen += vlen; 1353 } 1354 1355 /* Make total composite structure size a multiple of its alignment */ 1356 if ((align = ALIGNMENT(type)) != 0) { 1357 while (blen % align != 0) { 1358 if (blen >= *buflen) { 1359 error = ERANGE; 1360 goto done; 1361 } 1362 buf[blen++] = 0; 1363 } 1364 } 1365 1366 /* Done */ 1367 *buflen = blen; 1368done: 1369 if (foff != NULL) 1370 FREE(foff, M_NETGRAPH_PARSE); 1371 return (error); 1372} 1373 1374/* 1375 * Convert an array or structure from binary to ASCII 1376 */ 1377static int 1378ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, 1379 int *off, char *cbuf, int cbuflen, const enum comptype ctype) 1380{ 1381 const struct ng_mesg *const hdr 1382 = (const struct ng_mesg *)(data - sizeof(*hdr)); 1383 const int num = ng_get_composite_len(type, data, data + *off, ctype); 1384 const int workSize = 20 * 1024; /* XXX hard coded constant */ 1385 int nextIndex = 0, didOne = 0; 1386 int error, index; 1387 u_char *workBuf; 1388 1389 /* Get workspace for checking default values */ 1390 MALLOC(workBuf, u_char *, workSize, M_NETGRAPH_PARSE, M_NOWAIT); 1391 if (workBuf == NULL) 1392 return (ENOMEM); 1393 1394 /* Opening brace/bracket */ 1395 if ((error = ng_parse_append(&cbuf, &cbuflen, "%c", 1396 (ctype == CT_STRUCT) ? '{' : '[')) != 0) 1397 goto fail; 1398 1399 /* Do each item */ 1400 for (index = 0; index < num; index++) { 1401 const struct ng_parse_type *const 1402 etype = ng_get_composite_etype(type, index, ctype); 1403 1404 /* Skip any alignment pad bytes */ 1405 *off += ng_parse_get_elem_pad(type, index, ctype, *off); 1406 1407 /* 1408 * See if element is equal to its default value; skip if so. 1409 * Copy struct ng_mesg header for types that peek into it. 1410 */ 1411 if (sizeof(*hdr) + *off < workSize) { 1412 int tempsize = workSize - sizeof(*hdr) - *off; 1413 1414 bcopy(hdr, workBuf, sizeof(*hdr) + *off); 1415 if (ng_get_composite_elem_default(type, index, workBuf 1416 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off, 1417 &tempsize, ctype) == 0 1418 && bcmp(workBuf + sizeof(*hdr) + *off, 1419 data + *off, tempsize) == 0) { 1420 *off += tempsize; 1421 continue; 1422 } 1423 } 1424 1425 /* Print name= */ 1426 if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0) 1427 goto fail; 1428 if (ctype != CT_STRUCT) { 1429 if (index != nextIndex) { 1430 nextIndex = index; 1431 if ((error = ng_parse_append(&cbuf, 1432 &cbuflen, "%d=", index)) != 0) 1433 goto fail; 1434 } 1435 nextIndex++; 1436 } else { 1437 const struct ng_parse_struct_field *const 1438 fields = type->info; 1439 1440 if ((error = ng_parse_append(&cbuf, 1441 &cbuflen, "%s=", fields[index].name)) != 0) 1442 goto fail; 1443 } 1444 1445 /* Print value */ 1446 if ((error = INVOKE(etype, unparse) 1447 (etype, data, off, cbuf, cbuflen)) != 0) { 1448 FREE(workBuf, M_NETGRAPH_PARSE); 1449 return (error); 1450 } 1451 cbuflen -= strlen(cbuf); 1452 cbuf += strlen(cbuf); 1453 didOne = 1; 1454 } 1455 FREE(workBuf, M_NETGRAPH_PARSE); 1456 1457 /* Closing brace/bracket */ 1458 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s%c", 1459 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']')) != 0) 1460 goto fail; 1461 return (0); 1462 1463fail: 1464 /* Clean up after failure */ 1465 FREE(workBuf, M_NETGRAPH_PARSE); 1466 return (error); 1467} 1468 1469/* 1470 * Generate the default value for an element of an array or structure 1471 * Returns EOPNOTSUPP if default value is unspecified. 1472 */ 1473static int 1474ng_get_composite_elem_default(const struct ng_parse_type *type, 1475 int index, const u_char *const start, u_char *buf, int *buflen, 1476 const enum comptype ctype) 1477{ 1478 const struct ng_parse_type *etype; 1479 ng_getDefault_t *func; 1480 1481 switch (ctype) { 1482 case CT_STRUCT: 1483 break; 1484 case CT_ARRAY: 1485 { 1486 const struct ng_parse_array_info *const ai = type->info; 1487 1488 if (ai->getDefault != NULL) { 1489 return (*ai->getDefault)(type, 1490 index, start, buf, buflen); 1491 } 1492 break; 1493 } 1494 case CT_FIXEDARRAY: 1495 { 1496 const struct ng_parse_fixedarray_info *const fi = type->info; 1497 1498 if (*fi->getDefault != NULL) { 1499 return (*fi->getDefault)(type, 1500 index, start, buf, buflen); 1501 } 1502 break; 1503 } 1504 default: 1505 panic("%s", __func__); 1506 } 1507 1508 /* Default to element type default */ 1509 etype = ng_get_composite_etype(type, index, ctype); 1510 func = METHOD(etype, getDefault); 1511 if (func == NULL) 1512 return (EOPNOTSUPP); 1513 return (*func)(etype, start, buf, buflen); 1514} 1515 1516/* 1517 * Get the number of elements in a struct, variable or fixed array. 1518 */ 1519static int 1520ng_get_composite_len(const struct ng_parse_type *type, 1521 const u_char *const start, const u_char *buf, 1522 const enum comptype ctype) 1523{ 1524 switch (ctype) { 1525 case CT_STRUCT: 1526 { 1527 const struct ng_parse_struct_field *const fields = type->info; 1528 int numFields = 0; 1529 1530 for (numFields = 0; ; numFields++) { 1531 const struct ng_parse_struct_field *const 1532 fi = &fields[numFields]; 1533 1534 if (fi->name == NULL) 1535 break; 1536 } 1537 return (numFields); 1538 } 1539 case CT_ARRAY: 1540 { 1541 const struct ng_parse_array_info *const ai = type->info; 1542 1543 return (*ai->getLength)(type, start, buf); 1544 } 1545 case CT_FIXEDARRAY: 1546 { 1547 const struct ng_parse_fixedarray_info *const fi = type->info; 1548 1549 return fi->length; 1550 } 1551 default: 1552 panic("%s", __func__); 1553 } 1554 return (0); 1555} 1556 1557/* 1558 * Return the type of the index'th element of a composite structure 1559 */ 1560static const struct ng_parse_type * 1561ng_get_composite_etype(const struct ng_parse_type *type, 1562 int index, const enum comptype ctype) 1563{ 1564 const struct ng_parse_type *etype = NULL; 1565 1566 switch (ctype) { 1567 case CT_STRUCT: 1568 { 1569 const struct ng_parse_struct_field *const fields = type->info; 1570 1571 etype = fields[index].type; 1572 break; 1573 } 1574 case CT_ARRAY: 1575 { 1576 const struct ng_parse_array_info *const ai = type->info; 1577 1578 etype = ai->elementType; 1579 break; 1580 } 1581 case CT_FIXEDARRAY: 1582 { 1583 const struct ng_parse_fixedarray_info *const fi = type->info; 1584 1585 etype = fi->elementType; 1586 break; 1587 } 1588 default: 1589 panic("%s", __func__); 1590 } 1591 return (etype); 1592} 1593 1594/* 1595 * Get the number of bytes to skip to align for the next 1596 * element in a composite structure. 1597 */ 1598static int 1599ng_parse_get_elem_pad(const struct ng_parse_type *type, 1600 int index, enum comptype ctype, int posn) 1601{ 1602 const struct ng_parse_type *const 1603 etype = ng_get_composite_etype(type, index, ctype); 1604 int align; 1605 1606 /* Get element's alignment, and possibly override */ 1607 align = ALIGNMENT(etype); 1608 if (ctype == CT_STRUCT) { 1609 const struct ng_parse_struct_field *const fields = type->info; 1610 1611 if (fields[index].alignment != 0) 1612 align = fields[index].alignment; 1613 } 1614 1615 /* Return number of bytes to skip to align */ 1616 return (align ? (align - (posn % align)) % align : 0); 1617} 1618 1619/************************************************************************ 1620 PARSING HELPER ROUTINES 1621 ************************************************************************/ 1622 1623/* 1624 * Append to a fixed length string buffer. 1625 */ 1626static int 1627ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...) 1628{ 1629 va_list args; 1630 int len; 1631 1632 va_start(args, fmt); 1633 len = vsnprintf(*cbufp, *cbuflenp, fmt, args); 1634 va_end(args); 1635 if (len >= *cbuflenp) 1636 return ERANGE; 1637 *cbufp += len; 1638 *cbuflenp -= len; 1639 1640 return (0); 1641} 1642 1643/* 1644 * Skip over a value 1645 */ 1646static int 1647ng_parse_skip_value(const char *s, int off0, int *lenp) 1648{ 1649 int len, nbracket, nbrace; 1650 int off = off0; 1651 1652 len = nbracket = nbrace = 0; 1653 do { 1654 switch (ng_parse_get_token(s, &off, &len)) { 1655 case T_LBRACKET: 1656 nbracket++; 1657 break; 1658 case T_LBRACE: 1659 nbrace++; 1660 break; 1661 case T_RBRACKET: 1662 if (nbracket-- == 0) 1663 return (EINVAL); 1664 break; 1665 case T_RBRACE: 1666 if (nbrace-- == 0) 1667 return (EINVAL); 1668 break; 1669 case T_EOF: 1670 return (EINVAL); 1671 default: 1672 break; 1673 } 1674 off += len; 1675 } while (nbracket > 0 || nbrace > 0); 1676 *lenp = off - off0; 1677 return (0); 1678} 1679 1680/* 1681 * Find the next token in the string, starting at offset *startp. 1682 * Returns the token type, with *startp pointing to the first char 1683 * and *lenp the length. 1684 */ 1685enum ng_parse_token 1686ng_parse_get_token(const char *s, int *startp, int *lenp) 1687{ 1688 char *t; 1689 int i; 1690 1691 while (isspace(s[*startp])) 1692 (*startp)++; 1693 switch (s[*startp]) { 1694 case '\0': 1695 *lenp = 0; 1696 return T_EOF; 1697 case '{': 1698 *lenp = 1; 1699 return T_LBRACE; 1700 case '}': 1701 *lenp = 1; 1702 return T_RBRACE; 1703 case '[': 1704 *lenp = 1; 1705 return T_LBRACKET; 1706 case ']': 1707 *lenp = 1; 1708 return T_RBRACKET; 1709 case '=': 1710 *lenp = 1; 1711 return T_EQUALS; 1712 case '"': 1713 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL) 1714 return T_ERROR; 1715 FREE(t, M_NETGRAPH_PARSE); 1716 return T_STRING; 1717 default: 1718 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i]) 1719 && s[i] != '{' && s[i] != '}' && s[i] != '[' 1720 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++) 1721 ; 1722 *lenp = i - *startp; 1723 return T_WORD; 1724 } 1725} 1726 1727/* 1728 * Get a string token, which must be enclosed in double quotes. 1729 * The normal C backslash escapes are recognized. 1730 */ 1731char * 1732ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp) 1733{ 1734 char *cbuf, *p; 1735 int start, off; 1736 int slen; 1737 1738 while (isspace(s[*startp])) 1739 (*startp)++; 1740 start = *startp; 1741 if (s[*startp] != '"') 1742 return (NULL); 1743 MALLOC(cbuf, char *, strlen(s + start), M_NETGRAPH_PARSE, M_NOWAIT); 1744 if (cbuf == NULL) 1745 return (NULL); 1746 strcpy(cbuf, s + start + 1); 1747 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) { 1748 if (*p == '"') { 1749 *p = '\0'; 1750 *lenp = off + 1; 1751 if (slenp != NULL) 1752 *slenp = slen; 1753 return (cbuf); 1754 } else if (p[0] == '\\' && p[1] != '\0') { 1755 int x, k; 1756 char *v; 1757 1758 strcpy(p, p + 1); 1759 v = p; 1760 switch (*p) { 1761 case 't': 1762 *v = '\t'; 1763 off++; 1764 continue; 1765 case 'n': 1766 *v = '\n'; 1767 off++; 1768 continue; 1769 case 'r': 1770 *v = '\r'; 1771 off++; 1772 continue; 1773 case 'v': 1774 *v = '\v'; 1775 off++; 1776 continue; 1777 case 'f': 1778 *v = '\f'; 1779 off++; 1780 continue; 1781 case '"': 1782 *v = '"'; 1783 off++; 1784 continue; 1785 case '0': case '1': case '2': case '3': 1786 case '4': case '5': case '6': case '7': 1787 for (x = k = 0; 1788 k < 3 && *v >= '0' && *v <= '7'; v++) { 1789 x = (x << 3) + (*v - '0'); 1790 off++; 1791 } 1792 *--v = (char)x; 1793 break; 1794 case 'x': 1795 for (v++, x = k = 0; 1796 k < 2 && isxdigit(*v); v++) { 1797 x = (x << 4) + (isdigit(*v) ? 1798 (*v - '0') : 1799 (tolower(*v) - 'a' + 10)); 1800 off++; 1801 } 1802 *--v = (char)x; 1803 break; 1804 default: 1805 continue; 1806 } 1807 strcpy(p, v); 1808 } 1809 } 1810 FREE(cbuf, M_NETGRAPH_PARSE); 1811 return (NULL); /* no closing quote */ 1812} 1813 1814/* 1815 * Encode a string so it can be safely put in double quotes. 1816 * Caller must free the result. Exactly "slen" characters 1817 * are encoded. 1818 */ 1819char * 1820ng_encode_string(const char *raw, int slen) 1821{ 1822 char *cbuf; 1823 int off = 0; 1824 int i; 1825 1826 MALLOC(cbuf, char *, strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, M_NOWAIT); 1827 if (cbuf == NULL) 1828 return (NULL); 1829 cbuf[off++] = '"'; 1830 for (i = 0; i < slen; i++, raw++) { 1831 switch (*raw) { 1832 case '\t': 1833 cbuf[off++] = '\\'; 1834 cbuf[off++] = 't'; 1835 break; 1836 case '\f': 1837 cbuf[off++] = '\\'; 1838 cbuf[off++] = 'f'; 1839 break; 1840 case '\n': 1841 cbuf[off++] = '\\'; 1842 cbuf[off++] = 'n'; 1843 break; 1844 case '\r': 1845 cbuf[off++] = '\\'; 1846 cbuf[off++] = 'r'; 1847 break; 1848 case '\v': 1849 cbuf[off++] = '\\'; 1850 cbuf[off++] = 'v'; 1851 break; 1852 case '"': 1853 case '\\': 1854 cbuf[off++] = '\\'; 1855 cbuf[off++] = *raw; 1856 break; 1857 default: 1858 if (*raw < 0x20 || *raw > 0x7e) { 1859 off += sprintf(cbuf + off, 1860 "\\x%02x", (u_char)*raw); 1861 break; 1862 } 1863 cbuf[off++] = *raw; 1864 break; 1865 } 1866 } 1867 cbuf[off++] = '"'; 1868 cbuf[off] = '\0'; 1869 return (cbuf); 1870} 1871 1872/************************************************************************ 1873 VIRTUAL METHOD LOOKUP 1874 ************************************************************************/ 1875 1876static ng_parse_t * 1877ng_get_parse_method(const struct ng_parse_type *t) 1878{ 1879 while (t != NULL && t->parse == NULL) 1880 t = t->supertype; 1881 return (t ? t->parse : NULL); 1882} 1883 1884static ng_unparse_t * 1885ng_get_unparse_method(const struct ng_parse_type *t) 1886{ 1887 while (t != NULL && t->unparse == NULL) 1888 t = t->supertype; 1889 return (t ? t->unparse : NULL); 1890} 1891 1892static ng_getDefault_t * 1893ng_get_getDefault_method(const struct ng_parse_type *t) 1894{ 1895 while (t != NULL && t->getDefault == NULL) 1896 t = t->supertype; 1897 return (t ? t->getDefault : NULL); 1898} 1899 1900static ng_getAlign_t * 1901ng_get_getAlign_method(const struct ng_parse_type *t) 1902{ 1903 while (t != NULL && t->getAlign == NULL) 1904 t = t->supertype; 1905 return (t ? t->getAlign : NULL); 1906} 1907 1908