ng_parse.c revision 131108
1 2/* 3 * ng_parse.c 4 * 5 * Copyright (c) 1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Archie Cobbs <archie@freebsd.org> 38 * 39 * $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $ 40 * $FreeBSD: head/sys/netgraph/ng_parse.c 131108 2004-06-25 19:22:05Z julian $ 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/malloc.h> 49#include <sys/mbuf.h> 50#include <sys/ctype.h> 51 52#include <net/ethernet.h> 53 54#include <netinet/in.h> 55 56#include <netgraph/ng_message.h> 57#include <netgraph/netgraph.h> 58#include <netgraph/ng_parse.h> 59 60#ifdef NG_SEPARATE_MALLOC 61MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info"); 62#else 63#define M_NETGRAPH_PARSE M_NETGRAPH 64#endif 65 66/* Compute alignment for primitive integral types */ 67struct int16_temp { 68 char x; 69 int16_t y; 70}; 71 72struct int32_temp { 73 char x; 74 int32_t y; 75}; 76 77struct int64_temp { 78 char x; 79 int64_t y; 80}; 81 82#define INT8_ALIGNMENT 1 83#define INT16_ALIGNMENT ((int)&((struct int16_temp *)0)->y) 84#define INT32_ALIGNMENT ((int)&((struct int32_temp *)0)->y) 85#define INT64_ALIGNMENT ((int)&((struct int64_temp *)0)->y) 86 87/* Output format for integral types */ 88#define INT_UNSIGNED 0 89#define INT_SIGNED 1 90#define INT_HEX 2 91 92/* Type of composite object: struct, array, or fixedarray */ 93enum comptype { 94 CT_STRUCT, 95 CT_ARRAY, 96 CT_FIXEDARRAY, 97}; 98 99/* Composite types helper functions */ 100static int ng_parse_composite(const struct ng_parse_type *type, 101 const char *s, int *off, const u_char *start, 102 u_char *const buf, int *buflen, enum comptype ctype); 103static int ng_unparse_composite(const struct ng_parse_type *type, 104 const u_char *data, int *off, char *cbuf, int cbuflen, 105 enum comptype ctype); 106static int ng_get_composite_elem_default(const struct ng_parse_type *type, 107 int index, const u_char *start, u_char *buf, 108 int *buflen, enum comptype ctype); 109static int ng_get_composite_len(const struct ng_parse_type *type, 110 const u_char *start, const u_char *buf, 111 enum comptype ctype); 112static const struct ng_parse_type *ng_get_composite_etype(const struct 113 ng_parse_type *type, int index, enum comptype ctype); 114static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 115 int index, enum comptype ctype, int posn); 116 117/* Parsing helper functions */ 118static int ng_parse_skip_value(const char *s, int off, int *lenp); 119 120/* Poor man's virtual method calls */ 121#define METHOD(t,m) (ng_get_ ## m ## _method(t)) 122#define INVOKE(t,m) (*METHOD(t,m)) 123 124static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 125static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 126static ng_getDefault_t *ng_get_getDefault_method(const 127 struct ng_parse_type *t); 128static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 129 130#define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 131 0 : INVOKE(t, getAlign)(t)) 132 133/* For converting binary to string */ 134#define NG_PARSE_APPEND(fmt, args...) \ 135 do { \ 136 int len; \ 137 \ 138 len = snprintf((cbuf), (cbuflen), \ 139 fmt , ## args); \ 140 if (len >= (cbuflen)) \ 141 return (ERANGE); \ 142 (cbuf) += len; \ 143 (cbuflen) -= len; \ 144 } while (0) 145 146/************************************************************************ 147 PUBLIC FUNCTIONS 148 ************************************************************************/ 149 150/* 151 * Convert an ASCII string to binary according to the supplied type descriptor 152 */ 153int 154ng_parse(const struct ng_parse_type *type, 155 const char *string, int *off, u_char *buf, int *buflen) 156{ 157 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 158} 159 160/* 161 * Convert binary to an ASCII string according to the supplied type descriptor 162 */ 163int 164ng_unparse(const struct ng_parse_type *type, 165 const u_char *data, char *cbuf, int cbuflen) 166{ 167 int off = 0; 168 169 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 170} 171 172/* 173 * Fill in the default value according to the supplied type descriptor 174 */ 175int 176ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 177{ 178 ng_getDefault_t *const func = METHOD(type, getDefault); 179 180 if (func == NULL) 181 return (EOPNOTSUPP); 182 return (*func)(type, buf, buf, buflen); 183} 184 185 186/************************************************************************ 187 STRUCTURE TYPE 188 ************************************************************************/ 189 190static int 191ng_struct_parse(const struct ng_parse_type *type, 192 const char *s, int *off, const u_char *const start, 193 u_char *const buf, int *buflen) 194{ 195 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT); 196} 197 198static int 199ng_struct_unparse(const struct ng_parse_type *type, 200 const u_char *data, int *off, char *cbuf, int cbuflen) 201{ 202 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT); 203} 204 205static int 206ng_struct_getDefault(const struct ng_parse_type *type, 207 const u_char *const start, u_char *buf, int *buflen) 208{ 209 int off = 0; 210 211 return ng_parse_composite(type, 212 "{}", &off, start, buf, buflen, CT_STRUCT); 213} 214 215static int 216ng_struct_getAlign(const struct ng_parse_type *type) 217{ 218 const struct ng_parse_struct_field *field; 219 int align = 0; 220 221 for (field = type->info; field->name != NULL; field++) { 222 int falign = ALIGNMENT(field->type); 223 224 if (falign > align) 225 align = falign; 226 } 227 return align; 228} 229 230const struct ng_parse_type ng_parse_struct_type = { 231 NULL, 232 NULL, 233 NULL, 234 ng_struct_parse, 235 ng_struct_unparse, 236 ng_struct_getDefault, 237 ng_struct_getAlign 238}; 239 240/************************************************************************ 241 FIXED LENGTH ARRAY TYPE 242 ************************************************************************/ 243 244static int 245ng_fixedarray_parse(const struct ng_parse_type *type, 246 const char *s, int *off, const u_char *const start, 247 u_char *const buf, int *buflen) 248{ 249 return ng_parse_composite(type, 250 s, off, start, buf, buflen, CT_FIXEDARRAY); 251} 252 253static int 254ng_fixedarray_unparse(const struct ng_parse_type *type, 255 const u_char *data, int *off, char *cbuf, int cbuflen) 256{ 257 return ng_unparse_composite(type, 258 data, off, cbuf, cbuflen, CT_FIXEDARRAY); 259} 260 261static int 262ng_fixedarray_getDefault(const struct ng_parse_type *type, 263 const u_char *const start, u_char *buf, int *buflen) 264{ 265 int off = 0; 266 267 return ng_parse_composite(type, 268 "[]", &off, start, buf, buflen, CT_FIXEDARRAY); 269} 270 271static int 272ng_fixedarray_getAlign(const struct ng_parse_type *type) 273{ 274 const struct ng_parse_fixedarray_info *fi = type->info; 275 276 return ALIGNMENT(fi->elementType); 277} 278 279const struct ng_parse_type ng_parse_fixedarray_type = { 280 NULL, 281 NULL, 282 NULL, 283 ng_fixedarray_parse, 284 ng_fixedarray_unparse, 285 ng_fixedarray_getDefault, 286 ng_fixedarray_getAlign 287}; 288 289/************************************************************************ 290 VARIABLE LENGTH ARRAY TYPE 291 ************************************************************************/ 292 293static int 294ng_array_parse(const struct ng_parse_type *type, 295 const char *s, int *off, const u_char *const start, 296 u_char *const buf, int *buflen) 297{ 298 return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY); 299} 300 301static int 302ng_array_unparse(const struct ng_parse_type *type, 303 const u_char *data, int *off, char *cbuf, int cbuflen) 304{ 305 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY); 306} 307 308static int 309ng_array_getDefault(const struct ng_parse_type *type, 310 const u_char *const start, u_char *buf, int *buflen) 311{ 312 int off = 0; 313 314 return ng_parse_composite(type, 315 "[]", &off, start, buf, buflen, CT_ARRAY); 316} 317 318static int 319ng_array_getAlign(const struct ng_parse_type *type) 320{ 321 const struct ng_parse_array_info *ai = type->info; 322 323 return ALIGNMENT(ai->elementType); 324} 325 326const struct ng_parse_type ng_parse_array_type = { 327 NULL, 328 NULL, 329 NULL, 330 ng_array_parse, 331 ng_array_unparse, 332 ng_array_getDefault, 333 ng_array_getAlign 334}; 335 336/************************************************************************ 337 INT8 TYPE 338 ************************************************************************/ 339 340static int 341ng_int8_parse(const struct ng_parse_type *type, 342 const char *s, int *off, const u_char *const start, 343 u_char *const buf, int *buflen) 344{ 345 long val; 346 int8_t val8; 347 char *eptr; 348 349 val = strtol(s + *off, &eptr, 0); 350 if (val < (int8_t)0x80 || val > (u_int8_t)0xff || eptr == s + *off) 351 return (EINVAL); 352 *off = eptr - s; 353 val8 = (int8_t)val; 354 bcopy(&val8, buf, sizeof(int8_t)); 355 *buflen = sizeof(int8_t); 356 return (0); 357} 358 359static int 360ng_int8_unparse(const struct ng_parse_type *type, 361 const u_char *data, int *off, char *cbuf, int cbuflen) 362{ 363 const char *fmt; 364 int fval; 365 int8_t val; 366 367 bcopy(data + *off, &val, sizeof(int8_t)); 368 switch ((intptr_t)type->info) { 369 case INT_SIGNED: 370 fmt = "%d"; 371 fval = val; 372 break; 373 case INT_UNSIGNED: 374 fmt = "%u"; 375 fval = (u_int8_t)val; 376 break; 377 case INT_HEX: 378 fmt = "0x%x"; 379 fval = (u_int8_t)val; 380 break; 381 default: 382 panic("%s: unknown type", __func__); 383#ifdef RESTARTABLE_PANICS 384 return(0); 385#endif 386 } 387 NG_PARSE_APPEND(fmt, fval); 388 *off += sizeof(int8_t); 389 return (0); 390} 391 392static int 393ng_int8_getDefault(const struct ng_parse_type *type, 394 const u_char *const start, u_char *buf, int *buflen) 395{ 396 int8_t val; 397 398 if (*buflen < sizeof(int8_t)) 399 return (ERANGE); 400 val = 0; 401 bcopy(&val, buf, sizeof(int8_t)); 402 *buflen = sizeof(int8_t); 403 return (0); 404} 405 406static int 407ng_int8_getAlign(const struct ng_parse_type *type) 408{ 409 return INT8_ALIGNMENT; 410} 411 412const struct ng_parse_type ng_parse_int8_type = { 413 NULL, 414 (void *)INT_SIGNED, 415 NULL, 416 ng_int8_parse, 417 ng_int8_unparse, 418 ng_int8_getDefault, 419 ng_int8_getAlign 420}; 421 422const struct ng_parse_type ng_parse_uint8_type = { 423 &ng_parse_int8_type, 424 (void *)INT_UNSIGNED 425}; 426 427const struct ng_parse_type ng_parse_hint8_type = { 428 &ng_parse_int8_type, 429 (void *)INT_HEX 430}; 431 432/************************************************************************ 433 INT16 TYPE 434 ************************************************************************/ 435 436static int 437ng_int16_parse(const struct ng_parse_type *type, 438 const char *s, int *off, const u_char *const start, 439 u_char *const buf, int *buflen) 440{ 441 long val; 442 int16_t val16; 443 char *eptr; 444 445 val = strtol(s + *off, &eptr, 0); 446 if (val < (int16_t)0x8000 447 || val > (u_int16_t)0xffff || eptr == s + *off) 448 return (EINVAL); 449 *off = eptr - s; 450 val16 = (int16_t)val; 451 bcopy(&val16, buf, sizeof(int16_t)); 452 *buflen = sizeof(int16_t); 453 return (0); 454} 455 456static int 457ng_int16_unparse(const struct ng_parse_type *type, 458 const u_char *data, int *off, char *cbuf, int cbuflen) 459{ 460 const char *fmt; 461 int fval; 462 int16_t val; 463 464 bcopy(data + *off, &val, sizeof(int16_t)); 465 switch ((intptr_t)type->info) { 466 case INT_SIGNED: 467 fmt = "%d"; 468 fval = val; 469 break; 470 case INT_UNSIGNED: 471 fmt = "%u"; 472 fval = (u_int16_t)val; 473 break; 474 case INT_HEX: 475 fmt = "0x%x"; 476 fval = (u_int16_t)val; 477 break; 478 default: 479 panic("%s: unknown type", __func__); 480#ifdef RESTARTABLE_PANICS 481 return(0); 482#endif 483 } 484 NG_PARSE_APPEND(fmt, fval); 485 *off += sizeof(int16_t); 486 return (0); 487} 488 489static int 490ng_int16_getDefault(const struct ng_parse_type *type, 491 const u_char *const start, u_char *buf, int *buflen) 492{ 493 int16_t val; 494 495 if (*buflen < sizeof(int16_t)) 496 return (ERANGE); 497 val = 0; 498 bcopy(&val, buf, sizeof(int16_t)); 499 *buflen = sizeof(int16_t); 500 return (0); 501} 502 503static int 504ng_int16_getAlign(const struct ng_parse_type *type) 505{ 506 return INT16_ALIGNMENT; 507} 508 509const struct ng_parse_type ng_parse_int16_type = { 510 NULL, 511 (void *)INT_SIGNED, 512 NULL, 513 ng_int16_parse, 514 ng_int16_unparse, 515 ng_int16_getDefault, 516 ng_int16_getAlign 517}; 518 519const struct ng_parse_type ng_parse_uint16_type = { 520 &ng_parse_int16_type, 521 (void *)INT_UNSIGNED 522}; 523 524const struct ng_parse_type ng_parse_hint16_type = { 525 &ng_parse_int16_type, 526 (void *)INT_HEX 527}; 528 529/************************************************************************ 530 INT32 TYPE 531 ************************************************************************/ 532 533static int 534ng_int32_parse(const struct ng_parse_type *type, 535 const char *s, int *off, const u_char *const start, 536 u_char *const buf, int *buflen) 537{ 538 long val; /* assumes long is at least 32 bits */ 539 int32_t val32; 540 char *eptr; 541 542 val = strtol(s + *off, &eptr, 0); 543 if (val < (int32_t)0x80000000 544 || val > (u_int32_t)0xffffffff || eptr == s + *off) 545 return (EINVAL); 546 *off = eptr - s; 547 val32 = (int32_t)val; 548 bcopy(&val32, buf, sizeof(int32_t)); 549 *buflen = sizeof(int32_t); 550 return (0); 551} 552 553static int 554ng_int32_unparse(const struct ng_parse_type *type, 555 const u_char *data, int *off, char *cbuf, int cbuflen) 556{ 557 const char *fmt; 558 long fval; 559 int32_t val; 560 561 bcopy(data + *off, &val, sizeof(int32_t)); 562 switch ((intptr_t)type->info) { 563 case INT_SIGNED: 564 fmt = "%ld"; 565 fval = val; 566 break; 567 case INT_UNSIGNED: 568 fmt = "%lu"; 569 fval = (u_int32_t)val; 570 break; 571 case INT_HEX: 572 fmt = "0x%lx"; 573 fval = (u_int32_t)val; 574 break; 575 default: 576 panic("%s: unknown type", __func__); 577#ifdef RESTARTABLE_PANICS 578 return(0); 579#endif 580 } 581 NG_PARSE_APPEND(fmt, fval); 582 *off += sizeof(int32_t); 583 return (0); 584} 585 586static int 587ng_int32_getDefault(const struct ng_parse_type *type, 588 const u_char *const start, u_char *buf, int *buflen) 589{ 590 int32_t val; 591 592 if (*buflen < sizeof(int32_t)) 593 return (ERANGE); 594 val = 0; 595 bcopy(&val, buf, sizeof(int32_t)); 596 *buflen = sizeof(int32_t); 597 return (0); 598} 599 600static int 601ng_int32_getAlign(const struct ng_parse_type *type) 602{ 603 return INT32_ALIGNMENT; 604} 605 606const struct ng_parse_type ng_parse_int32_type = { 607 NULL, 608 (void *)INT_SIGNED, 609 NULL, 610 ng_int32_parse, 611 ng_int32_unparse, 612 ng_int32_getDefault, 613 ng_int32_getAlign 614}; 615 616const struct ng_parse_type ng_parse_uint32_type = { 617 &ng_parse_int32_type, 618 (void *)INT_UNSIGNED 619}; 620 621const struct ng_parse_type ng_parse_hint32_type = { 622 &ng_parse_int32_type, 623 (void *)INT_HEX 624}; 625 626/************************************************************************ 627 INT64 TYPE 628 ************************************************************************/ 629 630static int 631ng_int64_parse(const struct ng_parse_type *type, 632 const char *s, int *off, const u_char *const start, 633 u_char *const buf, int *buflen) 634{ 635 quad_t val; 636 int64_t val64; 637 char *eptr; 638 639 val = strtoq(s + *off, &eptr, 0); 640 if (eptr == s + *off) 641 return (EINVAL); 642 *off = eptr - s; 643 val64 = (int64_t)val; 644 bcopy(&val64, buf, sizeof(int64_t)); 645 *buflen = sizeof(int64_t); 646 return (0); 647} 648 649static int 650ng_int64_unparse(const struct ng_parse_type *type, 651 const u_char *data, int *off, char *cbuf, int cbuflen) 652{ 653 const char *fmt; 654 long long fval; 655 int64_t val; 656 657 bcopy(data + *off, &val, sizeof(int64_t)); 658 switch ((intptr_t)type->info) { 659 case INT_SIGNED: 660 fmt = "%lld"; 661 fval = val; 662 break; 663 case INT_UNSIGNED: 664 fmt = "%llu"; 665 fval = (u_int64_t)val; 666 break; 667 case INT_HEX: 668 fmt = "0x%llx"; 669 fval = (u_int64_t)val; 670 break; 671 default: 672 panic("%s: unknown type", __func__); 673#ifdef RESTARTABLE_PANICS 674 return(0); 675#endif 676 } 677 NG_PARSE_APPEND(fmt, fval); 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)); 750 751 if (s == NULL) 752 return (ENOMEM); 753 NG_PARSE_APPEND("%s", s); 754 *off += strlen(raw) + 1; 755 FREE(s, M_NETGRAPH_PARSE); 756 return (0); 757} 758 759static int 760ng_string_getDefault(const struct ng_parse_type *type, 761 const u_char *const start, u_char *buf, int *buflen) 762{ 763 764 if (*buflen < 1) 765 return (ERANGE); 766 buf[0] = (u_char)'\0'; 767 *buflen = 1; 768 return (0); 769} 770 771const struct ng_parse_type ng_parse_string_type = { 772 NULL, 773 NULL, 774 NULL, 775 ng_string_parse, 776 ng_string_unparse, 777 ng_string_getDefault, 778 NULL 779}; 780 781/************************************************************************ 782 FIXED BUFFER STRING TYPE 783 ************************************************************************/ 784 785static int 786ng_fixedstring_parse(const struct ng_parse_type *type, 787 const char *s, int *off, const u_char *const start, 788 u_char *const buf, int *buflen) 789{ 790 const struct ng_parse_fixedstring_info *const fi = type->info; 791 char *sval; 792 int len; 793 int slen; 794 795 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 796 return (EINVAL); 797 if (slen + 1 > fi->bufSize) 798 return (E2BIG); 799 *off += len; 800 bcopy(sval, buf, slen); 801 FREE(sval, M_NETGRAPH_PARSE); 802 bzero(buf + slen, fi->bufSize - slen); 803 *buflen = fi->bufSize; 804 return (0); 805} 806 807static int 808ng_fixedstring_unparse(const struct ng_parse_type *type, 809 const u_char *data, int *off, char *cbuf, int cbuflen) 810{ 811 const struct ng_parse_fixedstring_info *const fi = type->info; 812 int error, temp = *off; 813 814 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 815 return (error); 816 *off += fi->bufSize; 817 return (0); 818} 819 820static int 821ng_fixedstring_getDefault(const struct ng_parse_type *type, 822 const u_char *const start, u_char *buf, int *buflen) 823{ 824 const struct ng_parse_fixedstring_info *const fi = type->info; 825 826 if (*buflen < fi->bufSize) 827 return (ERANGE); 828 bzero(buf, fi->bufSize); 829 *buflen = fi->bufSize; 830 return (0); 831} 832 833const struct ng_parse_type ng_parse_fixedstring_type = { 834 NULL, 835 NULL, 836 NULL, 837 ng_fixedstring_parse, 838 ng_fixedstring_unparse, 839 ng_fixedstring_getDefault, 840 NULL 841}; 842 843const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 844 NG_NODESIZ 845}; 846const struct ng_parse_type ng_parse_nodebuf_type = { 847 &ng_parse_fixedstring_type, 848 &ng_parse_nodebuf_info 849}; 850 851const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 852 NG_HOOKSIZ 853}; 854const struct ng_parse_type ng_parse_hookbuf_type = { 855 &ng_parse_fixedstring_type, 856 &ng_parse_hookbuf_info 857}; 858 859const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 860 NG_PATHSIZ 861}; 862const struct ng_parse_type ng_parse_pathbuf_type = { 863 &ng_parse_fixedstring_type, 864 &ng_parse_pathbuf_info 865}; 866 867const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 868 NG_TYPESIZ 869}; 870const struct ng_parse_type ng_parse_typebuf_type = { 871 &ng_parse_fixedstring_type, 872 &ng_parse_typebuf_info 873}; 874 875const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 876 NG_CMDSTRSIZ 877}; 878const struct ng_parse_type ng_parse_cmdbuf_type = { 879 &ng_parse_fixedstring_type, 880 &ng_parse_cmdbuf_info 881}; 882 883/************************************************************************ 884 EXPLICITLY SIZED STRING TYPE 885 ************************************************************************/ 886 887static int 888ng_sizedstring_parse(const struct ng_parse_type *type, 889 const char *s, int *off, const u_char *const start, 890 u_char *const buf, int *buflen) 891{ 892 char *sval; 893 int len; 894 int slen; 895 896 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 897 return (EINVAL); 898 if (slen > 0xffff) 899 return (EINVAL); 900 *off += len; 901 *((u_int16_t *)buf) = (u_int16_t)slen; 902 bcopy(sval, buf + 2, slen); 903 FREE(sval, M_NETGRAPH_PARSE); 904 *buflen = 2 + slen; 905 return (0); 906} 907 908static int 909ng_sizedstring_unparse(const struct ng_parse_type *type, 910 const u_char *data, int *off, char *cbuf, int cbuflen) 911{ 912 const char *const raw = (const char *)data + *off + 2; 913 const int slen = *((const u_int16_t *)(data + *off)); 914 char *const s = ng_encode_string(raw, slen); 915 916 if (s == NULL) 917 return (ENOMEM); 918 NG_PARSE_APPEND("%s", s); 919 FREE(s, M_NETGRAPH_PARSE); 920 *off += slen + 2; 921 return (0); 922} 923 924static int 925ng_sizedstring_getDefault(const struct ng_parse_type *type, 926 const u_char *const start, u_char *buf, int *buflen) 927{ 928 if (*buflen < 2) 929 return (ERANGE); 930 bzero(buf, 2); 931 *buflen = 2; 932 return (0); 933} 934 935const struct ng_parse_type ng_parse_sizedstring_type = { 936 NULL, 937 NULL, 938 NULL, 939 ng_sizedstring_parse, 940 ng_sizedstring_unparse, 941 ng_sizedstring_getDefault, 942 NULL 943}; 944 945/************************************************************************ 946 IP ADDRESS TYPE 947 ************************************************************************/ 948 949static int 950ng_ipaddr_parse(const struct ng_parse_type *type, 951 const char *s, int *off, const u_char *const start, 952 u_char *const buf, int *buflen) 953{ 954 int i, error; 955 956 for (i = 0; i < 4; i++) { 957 if ((error = ng_int8_parse(&ng_parse_int8_type, 958 s, off, start, buf + i, buflen)) != 0) 959 return (error); 960 if (i < 3 && s[*off] != '.') 961 return (EINVAL); 962 (*off)++; 963 } 964 *buflen = 4; 965 return (0); 966} 967 968static int 969ng_ipaddr_unparse(const struct ng_parse_type *type, 970 const u_char *data, int *off, char *cbuf, int cbuflen) 971{ 972 struct in_addr ip; 973 974 bcopy(data + *off, &ip, sizeof(ip)); 975 NG_PARSE_APPEND("%d.%d.%d.%d", ((u_char *)&ip)[0], 976 ((u_char *)&ip)[1], ((u_char *)&ip)[2], ((u_char *)&ip)[3]); 977 *off += sizeof(ip); 978 return (0); 979} 980 981static int 982ng_ipaddr_getDefault(const struct ng_parse_type *type, 983 const u_char *const start, u_char *buf, int *buflen) 984{ 985 struct in_addr ip = { 0 }; 986 987 if (*buflen < sizeof(ip)) 988 return (ERANGE); 989 bcopy(&ip, buf, sizeof(ip)); 990 *buflen = sizeof(ip); 991 return (0); 992} 993 994const struct ng_parse_type ng_parse_ipaddr_type = { 995 NULL, 996 NULL, 997 NULL, 998 ng_ipaddr_parse, 999 ng_ipaddr_unparse, 1000 ng_ipaddr_getDefault, 1001 ng_int32_getAlign 1002}; 1003 1004/************************************************************************ 1005 ETHERNET ADDRESS TYPE 1006 ************************************************************************/ 1007 1008static int 1009ng_enaddr_parse(const struct ng_parse_type *type, 1010 const char *s, int *const off, const u_char *const start, 1011 u_char *const buf, int *const buflen) 1012{ 1013 char *eptr; 1014 u_long val; 1015 int i; 1016 1017 if (*buflen < ETHER_ADDR_LEN) 1018 return (ERANGE); 1019 for (i = 0; i < ETHER_ADDR_LEN; i++) { 1020 val = strtoul(s + *off, &eptr, 16); 1021 if (val > 0xff || eptr == s + *off) 1022 return (EINVAL); 1023 buf[i] = (u_char)val; 1024 *off = (eptr - s); 1025 if (i < ETHER_ADDR_LEN - 1) { 1026 if (*eptr != ':') 1027 return (EINVAL); 1028 (*off)++; 1029 } 1030 } 1031 *buflen = ETHER_ADDR_LEN; 1032 return (0); 1033} 1034 1035static int 1036ng_enaddr_unparse(const struct ng_parse_type *type, 1037 const u_char *data, int *off, char *cbuf, int cbuflen) 1038{ 1039 int len; 1040 1041 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 1042 data[*off], data[*off + 1], data[*off + 2], 1043 data[*off + 3], data[*off + 4], data[*off + 5]); 1044 if (len >= cbuflen) 1045 return (ERANGE); 1046 *off += ETHER_ADDR_LEN; 1047 return (0); 1048} 1049 1050const struct ng_parse_type ng_parse_enaddr_type = { 1051 NULL, 1052 NULL, 1053 NULL, 1054 ng_enaddr_parse, 1055 ng_enaddr_unparse, 1056 NULL, 1057 0 1058}; 1059 1060/************************************************************************ 1061 BYTE ARRAY TYPE 1062 ************************************************************************/ 1063 1064/* Get the length of a byte array */ 1065static int 1066ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type, 1067 const u_char *start, const u_char *buf) 1068{ 1069 ng_parse_array_getLength_t *const getLength = type->private; 1070 1071 return (*getLength)(type, start, buf); 1072} 1073 1074/* Byte array element type is hex int8 */ 1075static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = { 1076 &ng_parse_hint8_type, 1077 &ng_parse_bytearray_subtype_getLength, 1078 NULL 1079}; 1080static const struct ng_parse_type ng_parse_bytearray_subtype = { 1081 &ng_parse_array_type, 1082 &ng_parse_bytearray_subtype_info 1083}; 1084 1085static int 1086ng_bytearray_parse(const struct ng_parse_type *type, 1087 const char *s, int *off, const u_char *const start, 1088 u_char *const buf, int *buflen) 1089{ 1090 char *str; 1091 int toklen; 1092 int slen; 1093 1094 /* We accept either an array of bytes or a string constant */ 1095 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) { 1096 ng_parse_array_getLength_t *const getLength = type->info; 1097 int arraylen; 1098 1099 arraylen = (*getLength)(type, start, buf); 1100 if (arraylen > *buflen) { 1101 FREE(str, M_NETGRAPH_PARSE); 1102 return (ERANGE); 1103 } 1104 if (slen > arraylen) { 1105 FREE(str, M_NETGRAPH_PARSE); 1106 return (E2BIG); 1107 } 1108 bcopy(str, buf, slen); 1109 bzero(buf + slen, arraylen - slen); 1110 FREE(str, M_NETGRAPH_PARSE); 1111 *off += toklen; 1112 *buflen = arraylen; 1113 return (0); 1114 } else { 1115 struct ng_parse_type subtype; 1116 1117 subtype = ng_parse_bytearray_subtype; 1118 (const void *)subtype.private = type->info; 1119 return ng_array_parse(&subtype, s, off, start, buf, buflen); 1120 } 1121} 1122 1123static int 1124ng_bytearray_unparse(const struct ng_parse_type *type, 1125 const u_char *data, int *off, char *cbuf, int cbuflen) 1126{ 1127 struct ng_parse_type subtype; 1128 1129 subtype = ng_parse_bytearray_subtype; 1130 (const void *)subtype.private = type->info; 1131 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen); 1132} 1133 1134static int 1135ng_bytearray_getDefault(const struct ng_parse_type *type, 1136 const u_char *const start, u_char *buf, int *buflen) 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_getDefault(&subtype, start, buf, buflen); 1143} 1144 1145const struct ng_parse_type ng_parse_bytearray_type = { 1146 NULL, 1147 NULL, 1148 NULL, 1149 ng_bytearray_parse, 1150 ng_bytearray_unparse, 1151 ng_bytearray_getDefault, 1152 NULL 1153}; 1154 1155/************************************************************************ 1156 STRUCT NG_MESG TYPE 1157 ************************************************************************/ 1158 1159/* Get msg->header.arglen when "buf" is pointing to msg->data */ 1160static int 1161ng_parse_ng_mesg_getLength(const struct ng_parse_type *type, 1162 const u_char *start, const u_char *buf) 1163{ 1164 const struct ng_mesg *msg; 1165 1166 msg = (const struct ng_mesg *)(buf - sizeof(*msg)); 1167 return msg->header.arglen; 1168} 1169 1170/* Type for the variable length data portion of a struct ng_mesg */ 1171static const struct ng_parse_type ng_msg_data_type = { 1172 &ng_parse_bytearray_type, 1173 &ng_parse_ng_mesg_getLength 1174}; 1175 1176/* Type for the entire struct ng_mesg header with data section */ 1177static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1178 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1179const struct ng_parse_type ng_parse_ng_mesg_type = { 1180 &ng_parse_struct_type, 1181 &ng_parse_ng_mesg_type_fields, 1182}; 1183 1184/************************************************************************ 1185 COMPOSITE HELPER ROUTINES 1186 ************************************************************************/ 1187 1188/* 1189 * Convert a structure or array from ASCII to binary 1190 */ 1191static int 1192ng_parse_composite(const struct ng_parse_type *type, const char *s, 1193 int *off, const u_char *const start, u_char *const buf, int *buflen, 1194 const enum comptype ctype) 1195{ 1196 const int num = ng_get_composite_len(type, start, buf, ctype); 1197 int nextIndex = 0; /* next implicit array index */ 1198 u_int index; /* field or element index */ 1199 int *foff; /* field value offsets in string */ 1200 int align, len, blen, error = 0; 1201 1202 /* Initialize */ 1203 MALLOC(foff, int *, num * sizeof(*foff), M_NETGRAPH_PARSE, M_NOWAIT | M_ZERO); 1204 if (foff == NULL) { 1205 error = ENOMEM; 1206 goto done; 1207 } 1208 1209 /* Get opening brace/bracket */ 1210 if (ng_parse_get_token(s, off, &len) 1211 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) { 1212 error = EINVAL; 1213 goto done; 1214 } 1215 *off += len; 1216 1217 /* Get individual element value positions in the string */ 1218 for (;;) { 1219 enum ng_parse_token tok; 1220 1221 /* Check for closing brace/bracket */ 1222 tok = ng_parse_get_token(s, off, &len); 1223 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) { 1224 *off += len; 1225 break; 1226 } 1227 1228 /* For arrays, the 'name' (ie, index) is optional, so 1229 distinguish name from values by seeing if the next 1230 token is an equals sign */ 1231 if (ctype != CT_STRUCT) { 1232 int len2, off2; 1233 char *eptr; 1234 1235 /* If an opening brace/bracket, index is implied */ 1236 if (tok == T_LBRACE || tok == T_LBRACKET) { 1237 index = nextIndex++; 1238 goto gotIndex; 1239 } 1240 1241 /* Might be an index, might be a value, either way... */ 1242 if (tok != T_WORD) { 1243 error = EINVAL; 1244 goto done; 1245 } 1246 1247 /* If no equals sign follows, index is implied */ 1248 off2 = *off + len; 1249 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) { 1250 index = nextIndex++; 1251 goto gotIndex; 1252 } 1253 1254 /* Index was specified explicitly; parse it */ 1255 index = (u_int)strtoul(s + *off, &eptr, 0); 1256 if (index < 0 || eptr - (s + *off) != len) { 1257 error = EINVAL; 1258 goto done; 1259 } 1260 nextIndex = index + 1; 1261 *off += len + len2; 1262 } else { /* a structure field */ 1263 const struct ng_parse_struct_field *const 1264 fields = type->info; 1265 1266 /* Find the field by name (required) in field list */ 1267 if (tok != T_WORD) { 1268 error = EINVAL; 1269 goto done; 1270 } 1271 for (index = 0; index < num; index++) { 1272 const struct ng_parse_struct_field *const 1273 field = &fields[index]; 1274 1275 if (strncmp(&s[*off], field->name, len) == 0 1276 && field->name[len] == '\0') 1277 break; 1278 } 1279 if (index == num) { 1280 error = ENOENT; 1281 goto done; 1282 } 1283 *off += len; 1284 1285 /* Get equals sign */ 1286 if (ng_parse_get_token(s, off, &len) != T_EQUALS) { 1287 error = EINVAL; 1288 goto done; 1289 } 1290 *off += len; 1291 } 1292gotIndex: 1293 1294 /* Check array index */ 1295 if (index >= num) { 1296 error = E2BIG; 1297 goto done; 1298 } 1299 1300 /* Save value's position and skip over it for now */ 1301 if (foff[index] != 0) { 1302 error = EALREADY; /* duplicate */ 1303 goto done; 1304 } 1305 while (isspace(s[*off])) 1306 (*off)++; 1307 foff[index] = *off; 1308 if ((error = ng_parse_skip_value(s, *off, &len)) != 0) 1309 goto done; 1310 *off += len; 1311 } 1312 1313 /* Now build binary structure from supplied values and defaults */ 1314 for (blen = index = 0; index < num; index++) { 1315 const struct ng_parse_type *const 1316 etype = ng_get_composite_etype(type, index, ctype); 1317 int k, pad, vlen; 1318 1319 /* Zero-pad any alignment bytes */ 1320 pad = ng_parse_get_elem_pad(type, index, ctype, blen); 1321 for (k = 0; k < pad; k++) { 1322 if (blen >= *buflen) { 1323 error = ERANGE; 1324 goto done; 1325 } 1326 buf[blen++] = 0; 1327 } 1328 1329 /* Get value */ 1330 vlen = *buflen - blen; 1331 if (foff[index] == 0) { /* use default value */ 1332 error = ng_get_composite_elem_default(type, index, 1333 start, buf + blen, &vlen, ctype); 1334 } else { /* parse given value */ 1335 *off = foff[index]; 1336 error = INVOKE(etype, parse)(etype, 1337 s, off, start, buf + blen, &vlen); 1338 } 1339 if (error != 0) 1340 goto done; 1341 blen += vlen; 1342 } 1343 1344 /* Make total composite structure size a multiple of its alignment */ 1345 if ((align = ALIGNMENT(type)) != 0) { 1346 while (blen % align != 0) { 1347 if (blen >= *buflen) { 1348 error = ERANGE; 1349 goto done; 1350 } 1351 buf[blen++] = 0; 1352 } 1353 } 1354 1355 /* Done */ 1356 *buflen = blen; 1357done: 1358 if (foff != NULL) 1359 FREE(foff, M_NETGRAPH_PARSE); 1360 return (error); 1361} 1362 1363/* 1364 * Convert an array or structure from binary to ASCII 1365 */ 1366static int 1367ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, 1368 int *off, char *cbuf, int cbuflen, const enum comptype ctype) 1369{ 1370 const struct ng_mesg *const hdr 1371 = (const struct ng_mesg *)(data - sizeof(*hdr)); 1372 const int num = ng_get_composite_len(type, data, data + *off, ctype); 1373 const int workSize = 20 * 1024; /* XXX hard coded constant */ 1374 int nextIndex = 0, didOne = 0; 1375 int error, index; 1376 u_char *workBuf; 1377 1378 /* Get workspace for checking default values */ 1379 MALLOC(workBuf, u_char *, workSize, M_NETGRAPH_PARSE, M_NOWAIT); 1380 if (workBuf == NULL) 1381 return (ENOMEM); 1382 1383 /* Opening brace/bracket */ 1384 NG_PARSE_APPEND("%c", (ctype == CT_STRUCT) ? '{' : '['); 1385 1386 /* Do each item */ 1387 for (index = 0; index < num; index++) { 1388 const struct ng_parse_type *const 1389 etype = ng_get_composite_etype(type, index, ctype); 1390 1391 /* Skip any alignment pad bytes */ 1392 *off += ng_parse_get_elem_pad(type, index, ctype, *off); 1393 1394 /* 1395 * See if element is equal to its default value; skip if so. 1396 * Copy struct ng_mesg header for types that peek into it. 1397 */ 1398 if (sizeof(*hdr) + *off < workSize) { 1399 int tempsize = workSize - sizeof(*hdr) - *off; 1400 1401 bcopy(hdr, workBuf, sizeof(*hdr) + *off); 1402 if (ng_get_composite_elem_default(type, index, workBuf 1403 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off, 1404 &tempsize, ctype) == 0 1405 && bcmp(workBuf + sizeof(*hdr) + *off, 1406 data + *off, tempsize) == 0) { 1407 *off += tempsize; 1408 continue; 1409 } 1410 } 1411 1412 /* Print name= */ 1413 NG_PARSE_APPEND(" "); 1414 if (ctype != CT_STRUCT) { 1415 if (index != nextIndex) { 1416 nextIndex = index; 1417 NG_PARSE_APPEND("%d=", index); 1418 } 1419 nextIndex++; 1420 } else { 1421 const struct ng_parse_struct_field *const 1422 fields = type->info; 1423 1424 NG_PARSE_APPEND("%s=", fields[index].name); 1425 } 1426 1427 /* Print value */ 1428 if ((error = INVOKE(etype, unparse) 1429 (etype, data, off, cbuf, cbuflen)) != 0) { 1430 FREE(workBuf, M_NETGRAPH_PARSE); 1431 return (error); 1432 } 1433 cbuflen -= strlen(cbuf); 1434 cbuf += strlen(cbuf); 1435 didOne = 1; 1436 } 1437 FREE(workBuf, M_NETGRAPH_PARSE); 1438 1439 /* Closing brace/bracket */ 1440 NG_PARSE_APPEND("%s%c", 1441 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']'); 1442 return (0); 1443} 1444 1445/* 1446 * Generate the default value for an element of an array or structure 1447 * Returns EOPNOTSUPP if default value is unspecified. 1448 */ 1449static int 1450ng_get_composite_elem_default(const struct ng_parse_type *type, 1451 int index, const u_char *const start, u_char *buf, int *buflen, 1452 const enum comptype ctype) 1453{ 1454 const struct ng_parse_type *etype; 1455 ng_getDefault_t *func; 1456 1457 switch (ctype) { 1458 case CT_STRUCT: 1459 break; 1460 case CT_ARRAY: 1461 { 1462 const struct ng_parse_array_info *const ai = type->info; 1463 1464 if (ai->getDefault != NULL) { 1465 return (*ai->getDefault)(type, 1466 index, start, buf, buflen); 1467 } 1468 break; 1469 } 1470 case CT_FIXEDARRAY: 1471 { 1472 const struct ng_parse_fixedarray_info *const fi = type->info; 1473 1474 if (*fi->getDefault != NULL) { 1475 return (*fi->getDefault)(type, 1476 index, start, buf, buflen); 1477 } 1478 break; 1479 } 1480 default: 1481 panic("%s", __func__); 1482 } 1483 1484 /* Default to element type default */ 1485 etype = ng_get_composite_etype(type, index, ctype); 1486 func = METHOD(etype, getDefault); 1487 if (func == NULL) 1488 return (EOPNOTSUPP); 1489 return (*func)(etype, start, buf, buflen); 1490} 1491 1492/* 1493 * Get the number of elements in a struct, variable or fixed array. 1494 */ 1495static int 1496ng_get_composite_len(const struct ng_parse_type *type, 1497 const u_char *const start, const u_char *buf, 1498 const enum comptype ctype) 1499{ 1500 switch (ctype) { 1501 case CT_STRUCT: 1502 { 1503 const struct ng_parse_struct_field *const fields = type->info; 1504 int numFields = 0; 1505 1506 for (numFields = 0; ; numFields++) { 1507 const struct ng_parse_struct_field *const 1508 fi = &fields[numFields]; 1509 1510 if (fi->name == NULL) 1511 break; 1512 } 1513 return (numFields); 1514 } 1515 case CT_ARRAY: 1516 { 1517 const struct ng_parse_array_info *const ai = type->info; 1518 1519 return (*ai->getLength)(type, start, buf); 1520 } 1521 case CT_FIXEDARRAY: 1522 { 1523 const struct ng_parse_fixedarray_info *const fi = type->info; 1524 1525 return fi->length; 1526 } 1527 default: 1528 panic("%s", __func__); 1529 } 1530 return (0); 1531} 1532 1533/* 1534 * Return the type of the index'th element of a composite structure 1535 */ 1536static const struct ng_parse_type * 1537ng_get_composite_etype(const struct ng_parse_type *type, 1538 int index, const enum comptype ctype) 1539{ 1540 const struct ng_parse_type *etype = NULL; 1541 1542 switch (ctype) { 1543 case CT_STRUCT: 1544 { 1545 const struct ng_parse_struct_field *const fields = type->info; 1546 1547 etype = fields[index].type; 1548 break; 1549 } 1550 case CT_ARRAY: 1551 { 1552 const struct ng_parse_array_info *const ai = type->info; 1553 1554 etype = ai->elementType; 1555 break; 1556 } 1557 case CT_FIXEDARRAY: 1558 { 1559 const struct ng_parse_fixedarray_info *const fi = type->info; 1560 1561 etype = fi->elementType; 1562 break; 1563 } 1564 default: 1565 panic("%s", __func__); 1566 } 1567 return (etype); 1568} 1569 1570/* 1571 * Get the number of bytes to skip to align for the next 1572 * element in a composite structure. 1573 */ 1574static int 1575ng_parse_get_elem_pad(const struct ng_parse_type *type, 1576 int index, enum comptype ctype, int posn) 1577{ 1578 const struct ng_parse_type *const 1579 etype = ng_get_composite_etype(type, index, ctype); 1580 int align; 1581 1582 /* Get element's alignment, and possibly override */ 1583 align = ALIGNMENT(etype); 1584 if (ctype == CT_STRUCT) { 1585 const struct ng_parse_struct_field *const fields = type->info; 1586 1587 if (fields[index].alignment != 0) 1588 align = fields[index].alignment; 1589 } 1590 1591 /* Return number of bytes to skip to align */ 1592 return (align ? (align - (posn % align)) % align : 0); 1593} 1594 1595/************************************************************************ 1596 PARSING HELPER ROUTINES 1597 ************************************************************************/ 1598 1599/* 1600 * Skip over a value 1601 */ 1602static int 1603ng_parse_skip_value(const char *s, int off0, int *lenp) 1604{ 1605 int len, nbracket, nbrace; 1606 int off = off0; 1607 1608 len = nbracket = nbrace = 0; 1609 do { 1610 switch (ng_parse_get_token(s, &off, &len)) { 1611 case T_LBRACKET: 1612 nbracket++; 1613 break; 1614 case T_LBRACE: 1615 nbrace++; 1616 break; 1617 case T_RBRACKET: 1618 if (nbracket-- == 0) 1619 return (EINVAL); 1620 break; 1621 case T_RBRACE: 1622 if (nbrace-- == 0) 1623 return (EINVAL); 1624 break; 1625 case T_EOF: 1626 return (EINVAL); 1627 default: 1628 break; 1629 } 1630 off += len; 1631 } while (nbracket > 0 || nbrace > 0); 1632 *lenp = off - off0; 1633 return (0); 1634} 1635 1636/* 1637 * Find the next token in the string, starting at offset *startp. 1638 * Returns the token type, with *startp pointing to the first char 1639 * and *lenp the length. 1640 */ 1641enum ng_parse_token 1642ng_parse_get_token(const char *s, int *startp, int *lenp) 1643{ 1644 char *t; 1645 int i; 1646 1647 while (isspace(s[*startp])) 1648 (*startp)++; 1649 switch (s[*startp]) { 1650 case '\0': 1651 *lenp = 0; 1652 return T_EOF; 1653 case '{': 1654 *lenp = 1; 1655 return T_LBRACE; 1656 case '}': 1657 *lenp = 1; 1658 return T_RBRACE; 1659 case '[': 1660 *lenp = 1; 1661 return T_LBRACKET; 1662 case ']': 1663 *lenp = 1; 1664 return T_RBRACKET; 1665 case '=': 1666 *lenp = 1; 1667 return T_EQUALS; 1668 case '"': 1669 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL) 1670 return T_ERROR; 1671 FREE(t, M_NETGRAPH_PARSE); 1672 return T_STRING; 1673 default: 1674 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i]) 1675 && s[i] != '{' && s[i] != '}' && s[i] != '[' 1676 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++) 1677 ; 1678 *lenp = i - *startp; 1679 return T_WORD; 1680 } 1681} 1682 1683/* 1684 * Get a string token, which must be enclosed in double quotes. 1685 * The normal C backslash escapes are recognized. 1686 */ 1687char * 1688ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp) 1689{ 1690 char *cbuf, *p; 1691 int start, off; 1692 int slen; 1693 1694 while (isspace(s[*startp])) 1695 (*startp)++; 1696 start = *startp; 1697 if (s[*startp] != '"') 1698 return (NULL); 1699 MALLOC(cbuf, char *, strlen(s + start), M_NETGRAPH_PARSE, M_NOWAIT); 1700 if (cbuf == NULL) 1701 return (NULL); 1702 strcpy(cbuf, s + start + 1); 1703 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) { 1704 if (*p == '"') { 1705 *p = '\0'; 1706 *lenp = off + 1; 1707 if (slenp != NULL) 1708 *slenp = slen; 1709 return (cbuf); 1710 } else if (p[0] == '\\' && p[1] != '\0') { 1711 int x, k; 1712 char *v; 1713 1714 strcpy(p, p + 1); 1715 v = p; 1716 switch (*p) { 1717 case 't': 1718 *v = '\t'; 1719 off++; 1720 continue; 1721 case 'n': 1722 *v = '\n'; 1723 off++; 1724 continue; 1725 case 'r': 1726 *v = '\r'; 1727 off++; 1728 continue; 1729 case 'v': 1730 *v = '\v'; 1731 off++; 1732 continue; 1733 case 'f': 1734 *v = '\f'; 1735 off++; 1736 continue; 1737 case '"': 1738 *v = '"'; 1739 off++; 1740 continue; 1741 case '0': case '1': case '2': case '3': 1742 case '4': case '5': case '6': case '7': 1743 for (x = k = 0; 1744 k < 3 && *v >= '0' && *v <= '7'; v++) { 1745 x = (x << 3) + (*v - '0'); 1746 off++; 1747 } 1748 *--v = (char)x; 1749 break; 1750 case 'x': 1751 for (v++, x = k = 0; 1752 k < 2 && isxdigit(*v); v++) { 1753 x = (x << 4) + (isdigit(*v) ? 1754 (*v - '0') : 1755 (tolower(*v) - 'a' + 10)); 1756 off++; 1757 } 1758 *--v = (char)x; 1759 break; 1760 default: 1761 continue; 1762 } 1763 strcpy(p, v); 1764 } 1765 } 1766 FREE(cbuf, M_NETGRAPH_PARSE); 1767 return (NULL); /* no closing quote */ 1768} 1769 1770/* 1771 * Encode a string so it can be safely put in double quotes. 1772 * Caller must free the result. Exactly "slen" characters 1773 * are encoded. 1774 */ 1775char * 1776ng_encode_string(const char *raw, int slen) 1777{ 1778 char *cbuf; 1779 int off = 0; 1780 int i; 1781 1782 MALLOC(cbuf, char *, strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, M_NOWAIT); 1783 if (cbuf == NULL) 1784 return (NULL); 1785 cbuf[off++] = '"'; 1786 for (i = 0; i < slen; i++, raw++) { 1787 switch (*raw) { 1788 case '\t': 1789 cbuf[off++] = '\\'; 1790 cbuf[off++] = 't'; 1791 break; 1792 case '\f': 1793 cbuf[off++] = '\\'; 1794 cbuf[off++] = 'f'; 1795 break; 1796 case '\n': 1797 cbuf[off++] = '\\'; 1798 cbuf[off++] = 'n'; 1799 break; 1800 case '\r': 1801 cbuf[off++] = '\\'; 1802 cbuf[off++] = 'r'; 1803 break; 1804 case '\v': 1805 cbuf[off++] = '\\'; 1806 cbuf[off++] = 'v'; 1807 break; 1808 case '"': 1809 case '\\': 1810 cbuf[off++] = '\\'; 1811 cbuf[off++] = *raw; 1812 break; 1813 default: 1814 if (*raw < 0x20 || *raw > 0x7e) { 1815 off += sprintf(cbuf + off, 1816 "\\x%02x", (u_char)*raw); 1817 break; 1818 } 1819 cbuf[off++] = *raw; 1820 break; 1821 } 1822 } 1823 cbuf[off++] = '"'; 1824 cbuf[off] = '\0'; 1825 return (cbuf); 1826} 1827 1828/************************************************************************ 1829 VIRTUAL METHOD LOOKUP 1830 ************************************************************************/ 1831 1832static ng_parse_t * 1833ng_get_parse_method(const struct ng_parse_type *t) 1834{ 1835 while (t != NULL && t->parse == NULL) 1836 t = t->supertype; 1837 return (t ? t->parse : NULL); 1838} 1839 1840static ng_unparse_t * 1841ng_get_unparse_method(const struct ng_parse_type *t) 1842{ 1843 while (t != NULL && t->unparse == NULL) 1844 t = t->supertype; 1845 return (t ? t->unparse : NULL); 1846} 1847 1848static ng_getDefault_t * 1849ng_get_getDefault_method(const struct ng_parse_type *t) 1850{ 1851 while (t != NULL && t->getDefault == NULL) 1852 t = t->supertype; 1853 return (t ? t->getDefault : NULL); 1854} 1855 1856static ng_getAlign_t * 1857ng_get_getAlign_method(const struct ng_parse_type *t) 1858{ 1859 while (t != NULL && t->getAlign == NULL) 1860 t = t->supertype; 1861 return (t ? t->getAlign : NULL); 1862} 1863 1864