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