1 /* 2 * ng_parse.c 3 */ 4 5 /*- 6 * Copyright (c) 1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $ 41 * $FreeBSD$ 42 */ 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/errno.h> 49 #include <sys/limits.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/ctype.h> 53 54 #include <machine/stdarg.h> 55 56 #include <net/ethernet.h> 57 58 #include <netinet/in.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include <netgraph/ng_parse.h> 63 64 #ifdef NG_SEPARATE_MALLOC 65 static MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info"); 66 #else 67 #define M_NETGRAPH_PARSE M_NETGRAPH 68 #endif 69 70 /* Compute alignment for primitive integral types */ 71 struct int16_temp { 72 char x; 73 int16_t y; 74 }; 75 76 struct int32_temp { 77 char x; 78 int32_t y; 79 }; 80 81 struct int64_temp { 82 char x; 83 int64_t y; 84 }; 85 86 #define INT8_ALIGNMENT 1 87 #define INT16_ALIGNMENT ((size_t)&((struct int16_temp *)0)->y) 88 #define INT32_ALIGNMENT ((size_t)&((struct int32_temp *)0)->y) 89 #define INT64_ALIGNMENT ((size_t)&((struct int64_temp *)0)->y) 90 91 /* Output format for integral types */ 92 #define INT_UNSIGNED 0 93 #define INT_SIGNED 1 94 #define INT_HEX 2 95 96 /* Type of composite object: struct, array, or fixedarray */ 97 enum comptype { 98 CT_STRUCT, 99 CT_ARRAY, 100 CT_FIXEDARRAY, 101 }; 102 103 /* Composite types helper functions */ 104 static int ng_parse_composite(const struct ng_parse_type *type, 105 const char *s, int *off, const u_char *start, 106 u_char *const buf, int *buflen, enum comptype ctype); 107 static int ng_unparse_composite(const struct ng_parse_type *type, 108 const u_char *data, int *off, char *cbuf, int cbuflen, 109 enum comptype ctype); 110 static int ng_get_composite_elem_default(const struct ng_parse_type *type, 111 int index, const u_char *start, u_char *buf, 112 int *buflen, enum comptype ctype); 113 static int ng_get_composite_len(const struct ng_parse_type *type, 114 const u_char *start, const u_char *buf, 115 enum comptype ctype); 116 static const struct ng_parse_type *ng_get_composite_etype(const struct 117 ng_parse_type *type, int index, enum comptype ctype); 118 static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 119 int index, enum comptype ctype, int posn); 120 121 /* Parsing helper functions */ 122 static int ng_parse_skip_value(const char *s, int off, int *lenp); 123 static int ng_parse_append(char **cbufp, int *cbuflenp, 124 const char *fmt, ...); 125 126 /* Poor man's virtual method calls */ 127 #define METHOD(t,m) (ng_get_ ## m ## _method(t)) 128 #define INVOKE(t,m) (*METHOD(t,m)) 129 130 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 131 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 132 static ng_getDefault_t *ng_get_getDefault_method(const 133 struct ng_parse_type *t); 134 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 135 136 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 137 0 : INVOKE(t, getAlign)(t)) 138 139 /************************************************************************ 140 PUBLIC FUNCTIONS 141 ************************************************************************/ 142 143 /* 144 * Convert an ASCII string to binary according to the supplied type descriptor 145 */ 146 int 147 ng_parse(const struct ng_parse_type *type, 148 const char *string, int *off, u_char *buf, int *buflen) 149 { 150 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 151 } 152 153 /* 154 * Convert binary to an ASCII string according to the supplied type descriptor 155 */ 156 int 157 ng_unparse(const struct ng_parse_type *type, 158 const u_char *data, char *cbuf, int cbuflen) 159 { 160 int off = 0; 161 162 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 163 } 164 165 /* 166 * Fill in the default value according to the supplied type descriptor 167 */ 168 int 169 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 170 { 171 ng_getDefault_t *const func = METHOD(type, getDefault); 172 173 if (func == NULL) 174 return (EOPNOTSUPP); 175 return (*func)(type, buf, buf, buflen); 176 } 177 178 179 /************************************************************************ 180 STRUCTURE TYPE 181 ************************************************************************/ 182 183 static int 184 ng_struct_parse(const struct ng_parse_type *type, 185 const char *s, int *off, const u_char *const start, 186 u_char *const buf, int *buflen) 187 { 188 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT); 189 } 190 191 static int 192 ng_struct_unparse(const struct ng_parse_type *type, 193 const u_char *data, int *off, char *cbuf, int cbuflen) 194 { 195 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT); 196 } 197 198 static int 199 ng_struct_getDefault(const struct ng_parse_type *type, 200 const u_char *const start, u_char *buf, int *buflen) 201 { 202 int off = 0; 203 204 return ng_parse_composite(type, 205 "{}", &off, start, buf, buflen, CT_STRUCT); 206 } 207 208 static int 209 ng_struct_getAlign(const struct ng_parse_type *type) 210 { 211 const struct ng_parse_struct_field *field; 212 int align = 0; 213 214 for (field = type->info; field->name != NULL; field++) { 215 int falign = ALIGNMENT(field->type); 216 217 if (falign > align) 218 align = falign; 219 } 220 return align; 221 } 222 223 const struct ng_parse_type ng_parse_struct_type = { 224 NULL, 225 NULL, 226 NULL, 227 ng_struct_parse, 228 ng_struct_unparse, 229 ng_struct_getDefault, 230 ng_struct_getAlign 231 }; 232 233 /************************************************************************ 234 FIXED LENGTH ARRAY TYPE 235 ************************************************************************/ 236 237 static int 238 ng_fixedarray_parse(const struct ng_parse_type *type, 239 const char *s, int *off, const u_char *const start, 240 u_char *const buf, int *buflen) 241 { 242 return ng_parse_composite(type, 243 s, off, start, buf, buflen, CT_FIXEDARRAY); 244 } 245 246 static int 247 ng_fixedarray_unparse(const struct ng_parse_type *type, 248 const u_char *data, int *off, char *cbuf, int cbuflen) 249 { 250 return ng_unparse_composite(type, 251 data, off, cbuf, cbuflen, CT_FIXEDARRAY); 252 } 253 254 static int 255 ng_fixedarray_getDefault(const struct ng_parse_type *type, 256 const u_char *const start, u_char *buf, int *buflen) 257 { 258 int off = 0; 259 260 return ng_parse_composite(type, 261 "[]", &off, start, buf, buflen, CT_FIXEDARRAY); 262 } 263 264 static int 265 ng_fixedarray_getAlign(const struct ng_parse_type *type) 266 { 267 const struct ng_parse_fixedarray_info *fi = type->info; 268 269 return ALIGNMENT(fi->elementType); 270 } 271 272 const struct ng_parse_type ng_parse_fixedarray_type = { 273 NULL, 274 NULL, 275 NULL, 276 ng_fixedarray_parse, 277 ng_fixedarray_unparse, 278 ng_fixedarray_getDefault, 279 ng_fixedarray_getAlign 280 }; 281 282 /************************************************************************ 283 VARIABLE LENGTH ARRAY TYPE 284 ************************************************************************/ 285 286 static int 287 ng_array_parse(const struct ng_parse_type *type, 288 const char *s, int *off, const u_char *const start, 289 u_char *const buf, int *buflen) 290 { 291 return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY); 292 } 293 294 static int 295 ng_array_unparse(const struct ng_parse_type *type, 296 const u_char *data, int *off, char *cbuf, int cbuflen) 297 { 298 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY); 299 } 300 301 static int 302 ng_array_getDefault(const struct ng_parse_type *type, 303 const u_char *const start, u_char *buf, int *buflen) 304 { 305 int off = 0; 306 307 return ng_parse_composite(type, 308 "[]", &off, start, buf, buflen, CT_ARRAY); 309 } 310 311 static int 312 ng_array_getAlign(const struct ng_parse_type *type) 313 { 314 const struct ng_parse_array_info *ai = type->info; 315 316 return ALIGNMENT(ai->elementType); 317 } 318 319 const struct ng_parse_type ng_parse_array_type = { 320 NULL, 321 NULL, 322 NULL, 323 ng_array_parse, 324 ng_array_unparse, 325 ng_array_getDefault, 326 ng_array_getAlign 327 }; 328 329 /************************************************************************ 330 INT8 TYPE 331 ************************************************************************/ 332 333 static int 334 ng_int8_parse(const struct ng_parse_type *type, 335 const char *s, int *off, const u_char *const start, 336 u_char *const buf, int *buflen) 337 { 338 long val; 339 int8_t val8; 340 char *eptr; 341 342 val = strtol(s + *off, &eptr, 0); 343 if (val < (int8_t)0x80 || val > (u_int8_t)0xff || eptr == s + *off) 344 return (EINVAL); 345 *off = eptr - s; 346 val8 = (int8_t)val; 347 bcopy(&val8, buf, sizeof(int8_t)); 348 *buflen = sizeof(int8_t); 349 return (0); 350 } 351 352 static int 353 ng_int8_unparse(const struct ng_parse_type *type, 354 const u_char *data, int *off, char *cbuf, int cbuflen) 355 { 356 const char *fmt; 357 int fval; 358 int error; 359 int8_t val; 360 361 bcopy(data + *off, &val, sizeof(int8_t)); 362 switch ((intptr_t)type->info) { 363 case INT_SIGNED: 364 fmt = "%d"; 365 fval = val; 366 break; 367 case INT_UNSIGNED: 368 fmt = "%u"; 369 fval = (u_int8_t)val; 370 break; 371 case INT_HEX: 372 fmt = "0x%x"; 373 fval = (u_int8_t)val; 374 break; 375 default: 376 panic("%s: unknown type", __func__); 377 } 378 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 379 return (error); 380 *off += sizeof(int8_t); 381 return (0); 382 } 383 384 static int 385 ng_int8_getDefault(const struct ng_parse_type *type, 386 const u_char *const start, u_char *buf, int *buflen) 387 { 388 int8_t val; 389 390 if (*buflen < sizeof(int8_t)) 391 return (ERANGE); 392 val = 0; 393 bcopy(&val, buf, sizeof(int8_t)); 394 *buflen = sizeof(int8_t); 395 return (0); 396 } 397 398 static int 399 ng_int8_getAlign(const struct ng_parse_type *type) 400 { 401 return INT8_ALIGNMENT; 402 } 403 404 const struct ng_parse_type ng_parse_int8_type = { 405 NULL, 406 (void *)INT_SIGNED, 407 NULL, 408 ng_int8_parse, 409 ng_int8_unparse, 410 ng_int8_getDefault, 411 ng_int8_getAlign 412 }; 413 414 const struct ng_parse_type ng_parse_uint8_type = { 415 &ng_parse_int8_type, 416 (void *)INT_UNSIGNED 417 }; 418 419 const struct ng_parse_type ng_parse_hint8_type = { 420 &ng_parse_int8_type, 421 (void *)INT_HEX 422 }; 423 424 /************************************************************************ 425 INT16 TYPE 426 ************************************************************************/ 427 428 static int 429 ng_int16_parse(const struct ng_parse_type *type, 430 const char *s, int *off, const u_char *const start, 431 u_char *const buf, int *buflen) 432 { 433 long val; 434 int16_t val16; 435 char *eptr; 436 437 val = strtol(s + *off, &eptr, 0); 438 if (val < (int16_t)0x8000 439 || val > (u_int16_t)0xffff || eptr == s + *off) 440 return (EINVAL); 441 *off = eptr - s; 442 val16 = (int16_t)val; 443 bcopy(&val16, buf, sizeof(int16_t)); 444 *buflen = sizeof(int16_t); 445 return (0); 446 } 447 448 static int 449 ng_int16_unparse(const struct ng_parse_type *type, 450 const u_char *data, int *off, char *cbuf, int cbuflen) 451 { 452 const char *fmt; 453 int fval; 454 int error; 455 int16_t val; 456 457 bcopy(data + *off, &val, sizeof(int16_t)); 458 switch ((intptr_t)type->info) { 459 case INT_SIGNED: 460 fmt = "%d"; 461 fval = val; 462 break; 463 case INT_UNSIGNED: 464 fmt = "%u"; 465 fval = (u_int16_t)val; 466 break; 467 case INT_HEX: 468 fmt = "0x%x"; 469 fval = (u_int16_t)val; 470 break; 471 default: 472 panic("%s: unknown type", __func__); 473 } 474 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 475 return (error); 476 *off += sizeof(int16_t); 477 return (0); 478 } 479 480 static int 481 ng_int16_getDefault(const struct ng_parse_type *type, 482 const u_char *const start, u_char *buf, int *buflen) 483 { 484 int16_t val; 485 486 if (*buflen < sizeof(int16_t)) 487 return (ERANGE); 488 val = 0; 489 bcopy(&val, buf, sizeof(int16_t)); 490 *buflen = sizeof(int16_t); 491 return (0); 492 } 493 494 static int 495 ng_int16_getAlign(const struct ng_parse_type *type) 496 { 497 return INT16_ALIGNMENT; 498 } 499 500 const struct ng_parse_type ng_parse_int16_type = { 501 NULL, 502 (void *)INT_SIGNED, 503 NULL, 504 ng_int16_parse, 505 ng_int16_unparse, 506 ng_int16_getDefault, 507 ng_int16_getAlign 508 }; 509 510 const struct ng_parse_type ng_parse_uint16_type = { 511 &ng_parse_int16_type, 512 (void *)INT_UNSIGNED 513 }; 514 515 const struct ng_parse_type ng_parse_hint16_type = { 516 &ng_parse_int16_type, 517 (void *)INT_HEX 518 }; 519 520 /************************************************************************ 521 INT32 TYPE 522 ************************************************************************/ 523 524 static int 525 ng_int32_parse(const struct ng_parse_type *type, 526 const char *s, int *off, const u_char *const start, 527 u_char *const buf, int *buflen) 528 { 529 long val; /* assumes long is at least 32 bits */ 530 int32_t val32; 531 char *eptr; 532 533 if ((intptr_t)type->info == INT_SIGNED) 534 val = strtol(s + *off, &eptr, 0); 535 else 536 val = strtoul(s + *off, &eptr, 0); 537 if (val < (int32_t)0x80000000 538 || val > (u_int32_t)0xffffffff || eptr == s + *off) 539 return (EINVAL); 540 *off = eptr - s; 541 val32 = (int32_t)val; 542 bcopy(&val32, buf, sizeof(int32_t)); 543 *buflen = sizeof(int32_t); 544 return (0); 545 } 546 547 static int 548 ng_int32_unparse(const struct ng_parse_type *type, 549 const u_char *data, int *off, char *cbuf, int cbuflen) 550 { 551 const char *fmt; 552 long fval; 553 int error; 554 int32_t val; 555 556 bcopy(data + *off, &val, sizeof(int32_t)); 557 switch ((intptr_t)type->info) { 558 case INT_SIGNED: 559 fmt = "%ld"; 560 fval = val; 561 break; 562 case INT_UNSIGNED: 563 fmt = "%lu"; 564 fval = (u_int32_t)val; 565 break; 566 case INT_HEX: 567 fmt = "0x%lx"; 568 fval = (u_int32_t)val; 569 break; 570 default: 571 panic("%s: unknown type", __func__); 572 } 573 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 574 return (error); 575 *off += sizeof(int32_t); 576 return (0); 577 } 578 579 static int 580 ng_int32_getDefault(const struct ng_parse_type *type, 581 const u_char *const start, u_char *buf, int *buflen) 582 { 583 int32_t val; 584 585 if (*buflen < sizeof(int32_t)) 586 return (ERANGE); 587 val = 0; 588 bcopy(&val, buf, sizeof(int32_t)); 589 *buflen = sizeof(int32_t); 590 return (0); 591 } 592 593 static int 594 ng_int32_getAlign(const struct ng_parse_type *type) 595 { 596 return INT32_ALIGNMENT; 597 } 598 599 const struct ng_parse_type ng_parse_int32_type = { 600 NULL, 601 (void *)INT_SIGNED, 602 NULL, 603 ng_int32_parse, 604 ng_int32_unparse, 605 ng_int32_getDefault, 606 ng_int32_getAlign 607 }; 608 609 const struct ng_parse_type ng_parse_uint32_type = { 610 &ng_parse_int32_type, 611 (void *)INT_UNSIGNED 612 }; 613 614 const struct ng_parse_type ng_parse_hint32_type = { 615 &ng_parse_int32_type, 616 (void *)INT_HEX 617 }; 618 619 /************************************************************************ 620 INT64 TYPE 621 ************************************************************************/ 622 623 static int 624 ng_int64_parse(const struct ng_parse_type *type, 625 const char *s, int *off, const u_char *const start, 626 u_char *const buf, int *buflen) 627 { 628 quad_t val; 629 int64_t val64; 630 char *eptr; 631 632 val = strtoq(s + *off, &eptr, 0); 633 if (eptr == s + *off) 634 return (EINVAL); 635 *off = eptr - s; 636 val64 = (int64_t)val; 637 bcopy(&val64, buf, sizeof(int64_t)); 638 *buflen = sizeof(int64_t); 639 return (0); 640 } 641 642 static int 643 ng_int64_unparse(const struct ng_parse_type *type, 644 const u_char *data, int *off, char *cbuf, int cbuflen) 645 { 646 const char *fmt; 647 long long fval; 648 int64_t val; 649 int error; 650 651 bcopy(data + *off, &val, sizeof(int64_t)); 652 switch ((intptr_t)type->info) { 653 case INT_SIGNED: 654 fmt = "%lld"; 655 fval = val; 656 break; 657 case INT_UNSIGNED: 658 fmt = "%llu"; 659 fval = (u_int64_t)val; 660 break; 661 case INT_HEX: 662 fmt = "0x%llx"; 663 fval = (u_int64_t)val; 664 break; 665 default: 666 panic("%s: unknown type", __func__); 667 } 668 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 669 return (error); 670 *off += sizeof(int64_t); 671 return (0); 672 } 673 674 static int 675 ng_int64_getDefault(const struct ng_parse_type *type, 676 const u_char *const start, u_char *buf, int *buflen) 677 { 678 int64_t val; 679 680 if (*buflen < sizeof(int64_t)) 681 return (ERANGE); 682 val = 0; 683 bcopy(&val, buf, sizeof(int64_t)); 684 *buflen = sizeof(int64_t); 685 return (0); 686 } 687 688 static int 689 ng_int64_getAlign(const struct ng_parse_type *type) 690 { 691 return INT64_ALIGNMENT; 692 } 693 694 const struct ng_parse_type ng_parse_int64_type = { 695 NULL, 696 (void *)INT_SIGNED, 697 NULL, 698 ng_int64_parse, 699 ng_int64_unparse, 700 ng_int64_getDefault, 701 ng_int64_getAlign 702 }; 703 704 const struct ng_parse_type ng_parse_uint64_type = { 705 &ng_parse_int64_type, 706 (void *)INT_UNSIGNED 707 }; 708 709 const struct ng_parse_type ng_parse_hint64_type = { 710 &ng_parse_int64_type, 711 (void *)INT_HEX 712 }; 713 714 /************************************************************************ 715 STRING TYPE 716 ************************************************************************/ 717 718 static int 719 ng_string_parse(const struct ng_parse_type *type, 720 const char *s, int *off, const u_char *const start, 721 u_char *const buf, int *buflen) 722 { 723 char *sval; 724 int len; 725 int slen; 726 727 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 728 return (EINVAL); 729 *off += len; 730 bcopy(sval, buf, slen + 1); 731 free(sval, M_NETGRAPH_PARSE); 732 *buflen = slen + 1; 733 return (0); 734 } 735 736 static int 737 ng_string_unparse(const struct ng_parse_type *type, 738 const u_char *data, int *off, char *cbuf, int cbuflen) 739 { 740 const char *const raw = (const char *)data + *off; 741 char *const s = ng_encode_string(raw, strlen(raw)); 742 int error; 743 744 if (s == NULL) 745 return (ENOMEM); 746 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 747 free(s, M_NETGRAPH_PARSE); 748 return (error); 749 } 750 *off += strlen(raw) + 1; 751 free(s, M_NETGRAPH_PARSE); 752 return (0); 753 } 754 755 static int 756 ng_string_getDefault(const struct ng_parse_type *type, 757 const u_char *const start, u_char *buf, int *buflen) 758 { 759 760 if (*buflen < 1) 761 return (ERANGE); 762 buf[0] = (u_char)'\0'; 763 *buflen = 1; 764 return (0); 765 } 766 767 const struct ng_parse_type ng_parse_string_type = { 768 NULL, 769 NULL, 770 NULL, 771 ng_string_parse, 772 ng_string_unparse, 773 ng_string_getDefault, 774 NULL 775 }; 776 777 /************************************************************************ 778 FIXED BUFFER STRING TYPE 779 ************************************************************************/ 780 781 static int 782 ng_fixedstring_parse(const struct ng_parse_type *type, 783 const char *s, int *off, const u_char *const start, 784 u_char *const buf, int *buflen) 785 { 786 const struct ng_parse_fixedstring_info *const fi = type->info; 787 char *sval; 788 int len; 789 int slen; 790 791 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 792 return (EINVAL); 793 if (slen + 1 > fi->bufSize) { 794 free(sval, M_NETGRAPH_PARSE); 795 return (E2BIG); 796 } 797 *off += len; 798 bcopy(sval, buf, slen); 799 free(sval, M_NETGRAPH_PARSE); 800 bzero(buf + slen, fi->bufSize - slen); 801 *buflen = fi->bufSize; 802 return (0); 803 } 804 805 static int 806 ng_fixedstring_unparse(const struct ng_parse_type *type, 807 const u_char *data, int *off, char *cbuf, int cbuflen) 808 { 809 const struct ng_parse_fixedstring_info *const fi = type->info; 810 int error, temp = *off; 811 812 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 813 return (error); 814 *off += fi->bufSize; 815 return (0); 816 } 817 818 static int 819 ng_fixedstring_getDefault(const struct ng_parse_type *type, 820 const u_char *const start, u_char *buf, int *buflen) 821 { 822 const struct ng_parse_fixedstring_info *const fi = type->info; 823 824 if (*buflen < fi->bufSize) 825 return (ERANGE); 826 bzero(buf, fi->bufSize); 827 *buflen = fi->bufSize; 828 return (0); 829 } 830 831 const struct ng_parse_type ng_parse_fixedstring_type = { 832 NULL, 833 NULL, 834 NULL, 835 ng_fixedstring_parse, 836 ng_fixedstring_unparse, 837 ng_fixedstring_getDefault, 838 NULL 839 }; 840 841 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 842 NG_NODESIZ 843 }; 844 const struct ng_parse_type ng_parse_nodebuf_type = { 845 &ng_parse_fixedstring_type, 846 &ng_parse_nodebuf_info 847 }; 848 849 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 850 NG_HOOKSIZ 851 }; 852 const struct ng_parse_type ng_parse_hookbuf_type = { 853 &ng_parse_fixedstring_type, 854 &ng_parse_hookbuf_info 855 }; 856 857 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 858 NG_PATHSIZ 859 }; 860 const struct ng_parse_type ng_parse_pathbuf_type = { 861 &ng_parse_fixedstring_type, 862 &ng_parse_pathbuf_info 863 }; 864 865 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 866 NG_TYPESIZ 867 }; 868 const struct ng_parse_type ng_parse_typebuf_type = { 869 &ng_parse_fixedstring_type, 870 &ng_parse_typebuf_info 871 }; 872 873 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 874 NG_CMDSTRSIZ 875 }; 876 const struct ng_parse_type ng_parse_cmdbuf_type = { 877 &ng_parse_fixedstring_type, 878 &ng_parse_cmdbuf_info 879 }; 880 881 /************************************************************************ 882 EXPLICITLY SIZED STRING TYPE 883 ************************************************************************/ 884 885 static int 886 ng_sizedstring_parse(const struct ng_parse_type *type, 887 const char *s, int *off, const u_char *const start, 888 u_char *const buf, int *buflen) 889 { 890 char *sval; 891 int len; 892 int slen; 893 894 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 895 return (EINVAL); 896 if (slen > USHRT_MAX) { 897 free(sval, M_NETGRAPH_PARSE); 898 return (EINVAL); 899 } 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 } 907 908 static int 909 ng_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 int error; 916 917 if (s == NULL) 918 return (ENOMEM); 919 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 920 free(s, M_NETGRAPH_PARSE); 921 return (error); 922 } 923 free(s, M_NETGRAPH_PARSE); 924 *off += slen + 2; 925 return (0); 926 } 927 928 static int 929 ng_sizedstring_getDefault(const struct ng_parse_type *type, 930 const u_char *const start, u_char *buf, int *buflen) 931 { 932 if (*buflen < 2) 933 return (ERANGE); 934 bzero(buf, 2); 935 *buflen = 2; 936 return (0); 937 } 938 939 const struct ng_parse_type ng_parse_sizedstring_type = { 940 NULL, 941 NULL, 942 NULL, 943 ng_sizedstring_parse, 944 ng_sizedstring_unparse, 945 ng_sizedstring_getDefault, 946 NULL 947 }; 948 949 /************************************************************************ 950 IP ADDRESS TYPE 951 ************************************************************************/ 952 953 static int 954 ng_ipaddr_parse(const struct ng_parse_type *type, 955 const char *s, int *off, const u_char *const start, 956 u_char *const buf, int *buflen) 957 { 958 int i, error; 959 960 for (i = 0; i < 4; i++) { 961 if ((error = ng_int8_parse(&ng_parse_int8_type, 962 s, off, start, buf + i, buflen)) != 0) 963 return (error); 964 if (i < 3 && s[*off] != '.') 965 return (EINVAL); 966 (*off)++; 967 } 968 *buflen = 4; 969 return (0); 970 } 971 972 static int 973 ng_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 } 987 988 static int 989 ng_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 1001 const 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 1015 static int 1016 ng_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 1042 static int 1043 ng_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 1057 const 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 */ 1072 static int 1073 ng_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 */ 1082 static 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 }; 1087 static const struct ng_parse_type ng_parse_bytearray_subtype = { 1088 &ng_parse_array_type, 1089 &ng_parse_bytearray_subtype_info 1090 }; 1091 1092 static int 1093 ng_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 1130 static int 1131 ng_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 1141 static int 1142 ng_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 1152 const 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 */ 1167 static int 1168 ng_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 */ 1178 static 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 */ 1184 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1185 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1186 const 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 */ 1198 static int 1199 ng_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 } 1301 gotIndex: 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; 1366 done: 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 */ 1375 static int 1376 ng_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 1458 fail: 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 */ 1468 static int 1469 ng_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 */ 1514 static int 1515 ng_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 */ 1555 static const struct ng_parse_type * 1556 ng_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 */ 1593 static int 1594 ng_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 */ 1621 static int 1622 ng_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 */ 1641 static int 1642 ng_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 */ 1680 enum ng_parse_token 1681 ng_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 */ 1726 char * 1727 ng_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 */ 1814 char * 1815 ng_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 1871 static ng_parse_t * 1872 ng_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 1879 static ng_unparse_t * 1880 ng_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 1887 static ng_getDefault_t * 1888 ng_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 1895 static ng_getAlign_t * 1896 ng_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 1903