1 /* 2 * ng_parse.c 3 */ 4 5 /*- 6 * Copyright (c) 1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $ 41 * $FreeBSD$ 42 */ 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/errno.h> 49 #include <sys/limits.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/ctype.h> 53 54 #include <machine/stdarg.h> 55 56 #include <net/ethernet.h> 57 58 #include <netinet/in.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include <netgraph/ng_parse.h> 63 64 #ifdef NG_SEPARATE_MALLOC 65 static MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info"); 66 #else 67 #define M_NETGRAPH_PARSE M_NETGRAPH 68 #endif 69 70 /* Compute alignment for primitive integral types */ 71 struct int16_temp { 72 char x; 73 int16_t y; 74 }; 75 76 struct int32_temp { 77 char x; 78 int32_t y; 79 }; 80 81 struct int64_temp { 82 char x; 83 int64_t y; 84 }; 85 86 #define INT8_ALIGNMENT 1 87 #define INT16_ALIGNMENT ((size_t)&((struct int16_temp *)0)->y) 88 #define INT32_ALIGNMENT ((size_t)&((struct int32_temp *)0)->y) 89 #define INT64_ALIGNMENT ((size_t)&((struct int64_temp *)0)->y) 90 91 /* Output format for integral types */ 92 #define INT_UNSIGNED 0 93 #define INT_SIGNED 1 94 #define INT_HEX 2 95 96 /* Type of composite object: struct, array, or fixedarray */ 97 enum comptype { 98 CT_STRUCT, 99 CT_ARRAY, 100 CT_FIXEDARRAY, 101 }; 102 103 /* Composite types helper functions */ 104 static int ng_parse_composite(const struct ng_parse_type *type, 105 const char *s, int *off, const u_char *start, 106 u_char *const buf, int *buflen, enum comptype ctype); 107 static int ng_unparse_composite(const struct ng_parse_type *type, 108 const u_char *data, int *off, char *cbuf, int cbuflen, 109 enum comptype ctype); 110 static int ng_get_composite_elem_default(const struct ng_parse_type *type, 111 int index, const u_char *start, u_char *buf, 112 int *buflen, enum comptype ctype); 113 static int ng_get_composite_len(const struct ng_parse_type *type, 114 const u_char *start, const u_char *buf, 115 enum comptype ctype); 116 static const struct ng_parse_type *ng_get_composite_etype(const struct 117 ng_parse_type *type, int index, enum comptype ctype); 118 static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 119 int index, enum comptype ctype, int posn); 120 121 /* Parsing helper functions */ 122 static int ng_parse_skip_value(const char *s, int off, int *lenp); 123 static int ng_parse_append(char **cbufp, int *cbuflenp, 124 const char *fmt, ...); 125 126 /* Poor man's virtual method calls */ 127 #define METHOD(t,m) (ng_get_ ## m ## _method(t)) 128 #define INVOKE(t,m) (*METHOD(t,m)) 129 130 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 131 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 132 static ng_getDefault_t *ng_get_getDefault_method(const 133 struct ng_parse_type *t); 134 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 135 136 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 137 0 : INVOKE(t, getAlign)(t)) 138 139 /************************************************************************ 140 PUBLIC FUNCTIONS 141 ************************************************************************/ 142 143 /* 144 * Convert an ASCII string to binary according to the supplied type descriptor 145 */ 146 int 147 ng_parse(const struct ng_parse_type *type, 148 const char *string, int *off, u_char *buf, int *buflen) 149 { 150 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 151 } 152 153 /* 154 * Convert binary to an ASCII string according to the supplied type descriptor 155 */ 156 int 157 ng_unparse(const struct ng_parse_type *type, 158 const u_char *data, char *cbuf, int cbuflen) 159 { 160 int off = 0; 161 162 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 163 } 164 165 /* 166 * Fill in the default value according to the supplied type descriptor 167 */ 168 int 169 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 170 { 171 ng_getDefault_t *const func = METHOD(type, getDefault); 172 173 if (func == NULL) 174 return (EOPNOTSUPP); 175 return (*func)(type, buf, buf, buflen); 176 } 177 178 /************************************************************************ 179 STRUCTURE TYPE 180 ************************************************************************/ 181 182 static int 183 ng_struct_parse(const struct ng_parse_type *type, 184 const char *s, int *off, const u_char *const start, 185 u_char *const buf, int *buflen) 186 { 187 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT); 188 } 189 190 static int 191 ng_struct_unparse(const struct ng_parse_type *type, 192 const u_char *data, int *off, char *cbuf, int cbuflen) 193 { 194 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT); 195 } 196 197 static int 198 ng_struct_getDefault(const struct ng_parse_type *type, 199 const u_char *const start, u_char *buf, int *buflen) 200 { 201 int off = 0; 202 203 return ng_parse_composite(type, 204 "{}", &off, start, buf, buflen, CT_STRUCT); 205 } 206 207 static int 208 ng_struct_getAlign(const struct ng_parse_type *type) 209 { 210 const struct ng_parse_struct_field *field; 211 int align = 0; 212 213 for (field = type->info; field->name != NULL; field++) { 214 int falign = ALIGNMENT(field->type); 215 216 if (falign > align) 217 align = falign; 218 } 219 return align; 220 } 221 222 const struct ng_parse_type ng_parse_struct_type = { 223 NULL, 224 NULL, 225 NULL, 226 ng_struct_parse, 227 ng_struct_unparse, 228 ng_struct_getDefault, 229 ng_struct_getAlign 230 }; 231 232 /************************************************************************ 233 FIXED LENGTH ARRAY TYPE 234 ************************************************************************/ 235 236 static int 237 ng_fixedarray_parse(const struct ng_parse_type *type, 238 const char *s, int *off, const u_char *const start, 239 u_char *const buf, int *buflen) 240 { 241 return ng_parse_composite(type, 242 s, off, start, buf, buflen, CT_FIXEDARRAY); 243 } 244 245 static int 246 ng_fixedarray_unparse(const struct ng_parse_type *type, 247 const u_char *data, int *off, char *cbuf, int cbuflen) 248 { 249 return ng_unparse_composite(type, 250 data, off, cbuf, cbuflen, CT_FIXEDARRAY); 251 } 252 253 static int 254 ng_fixedarray_getDefault(const struct ng_parse_type *type, 255 const u_char *const start, u_char *buf, int *buflen) 256 { 257 int off = 0; 258 259 return ng_parse_composite(type, 260 "[]", &off, start, buf, buflen, CT_FIXEDARRAY); 261 } 262 263 static int 264 ng_fixedarray_getAlign(const struct ng_parse_type *type) 265 { 266 const struct ng_parse_fixedarray_info *fi = type->info; 267 268 return ALIGNMENT(fi->elementType); 269 } 270 271 const struct ng_parse_type ng_parse_fixedarray_type = { 272 NULL, 273 NULL, 274 NULL, 275 ng_fixedarray_parse, 276 ng_fixedarray_unparse, 277 ng_fixedarray_getDefault, 278 ng_fixedarray_getAlign 279 }; 280 281 /************************************************************************ 282 VARIABLE LENGTH ARRAY TYPE 283 ************************************************************************/ 284 285 static int 286 ng_array_parse(const struct ng_parse_type *type, 287 const char *s, int *off, const u_char *const start, 288 u_char *const buf, int *buflen) 289 { 290 return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY); 291 } 292 293 static int 294 ng_array_unparse(const struct ng_parse_type *type, 295 const u_char *data, int *off, char *cbuf, int cbuflen) 296 { 297 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY); 298 } 299 300 static int 301 ng_array_getDefault(const struct ng_parse_type *type, 302 const u_char *const start, u_char *buf, int *buflen) 303 { 304 int off = 0; 305 306 return ng_parse_composite(type, 307 "[]", &off, start, buf, buflen, CT_ARRAY); 308 } 309 310 static int 311 ng_array_getAlign(const struct ng_parse_type *type) 312 { 313 const struct ng_parse_array_info *ai = type->info; 314 315 return ALIGNMENT(ai->elementType); 316 } 317 318 const struct ng_parse_type ng_parse_array_type = { 319 NULL, 320 NULL, 321 NULL, 322 ng_array_parse, 323 ng_array_unparse, 324 ng_array_getDefault, 325 ng_array_getAlign 326 }; 327 328 /************************************************************************ 329 INT8 TYPE 330 ************************************************************************/ 331 332 static int 333 ng_int8_parse(const struct ng_parse_type *type, 334 const char *s, int *off, const u_char *const start, 335 u_char *const buf, int *buflen) 336 { 337 long val; 338 int8_t val8; 339 char *eptr; 340 341 val = strtol(s + *off, &eptr, 0); 342 if (val < (int8_t)0x80 || val > (u_int8_t)0xff || eptr == s + *off) 343 return (EINVAL); 344 *off = eptr - s; 345 val8 = (int8_t)val; 346 bcopy(&val8, buf, sizeof(int8_t)); 347 *buflen = sizeof(int8_t); 348 return (0); 349 } 350 351 static int 352 ng_int8_unparse(const struct ng_parse_type *type, 353 const u_char *data, int *off, char *cbuf, int cbuflen) 354 { 355 const char *fmt; 356 int fval; 357 int error; 358 int8_t val; 359 360 bcopy(data + *off, &val, sizeof(int8_t)); 361 switch ((intptr_t)type->info) { 362 case INT_SIGNED: 363 fmt = "%d"; 364 fval = val; 365 break; 366 case INT_UNSIGNED: 367 fmt = "%u"; 368 fval = (u_int8_t)val; 369 break; 370 case INT_HEX: 371 fmt = "0x%x"; 372 fval = (u_int8_t)val; 373 break; 374 default: 375 panic("%s: unknown type", __func__); 376 } 377 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 378 return (error); 379 *off += sizeof(int8_t); 380 return (0); 381 } 382 383 static int 384 ng_int8_getDefault(const struct ng_parse_type *type, 385 const u_char *const start, u_char *buf, int *buflen) 386 { 387 int8_t val; 388 389 if (*buflen < sizeof(int8_t)) 390 return (ERANGE); 391 val = 0; 392 bcopy(&val, buf, sizeof(int8_t)); 393 *buflen = sizeof(int8_t); 394 return (0); 395 } 396 397 static int 398 ng_int8_getAlign(const struct ng_parse_type *type) 399 { 400 return INT8_ALIGNMENT; 401 } 402 403 const struct ng_parse_type ng_parse_int8_type = { 404 NULL, 405 (void *)INT_SIGNED, 406 NULL, 407 ng_int8_parse, 408 ng_int8_unparse, 409 ng_int8_getDefault, 410 ng_int8_getAlign 411 }; 412 413 const struct ng_parse_type ng_parse_uint8_type = { 414 &ng_parse_int8_type, 415 (void *)INT_UNSIGNED 416 }; 417 418 const struct ng_parse_type ng_parse_hint8_type = { 419 &ng_parse_int8_type, 420 (void *)INT_HEX 421 }; 422 423 /************************************************************************ 424 INT16 TYPE 425 ************************************************************************/ 426 427 static int 428 ng_int16_parse(const struct ng_parse_type *type, 429 const char *s, int *off, const u_char *const start, 430 u_char *const buf, int *buflen) 431 { 432 long val; 433 int16_t val16; 434 char *eptr; 435 436 val = strtol(s + *off, &eptr, 0); 437 if (val < (int16_t)0x8000 438 || val > (u_int16_t)0xffff || eptr == s + *off) 439 return (EINVAL); 440 *off = eptr - s; 441 val16 = (int16_t)val; 442 bcopy(&val16, buf, sizeof(int16_t)); 443 *buflen = sizeof(int16_t); 444 return (0); 445 } 446 447 static int 448 ng_int16_unparse(const struct ng_parse_type *type, 449 const u_char *data, int *off, char *cbuf, int cbuflen) 450 { 451 const char *fmt; 452 int fval; 453 int error; 454 int16_t val; 455 456 bcopy(data + *off, &val, sizeof(int16_t)); 457 switch ((intptr_t)type->info) { 458 case INT_SIGNED: 459 fmt = "%d"; 460 fval = val; 461 break; 462 case INT_UNSIGNED: 463 fmt = "%u"; 464 fval = (u_int16_t)val; 465 break; 466 case INT_HEX: 467 fmt = "0x%x"; 468 fval = (u_int16_t)val; 469 break; 470 default: 471 panic("%s: unknown type", __func__); 472 } 473 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 474 return (error); 475 *off += sizeof(int16_t); 476 return (0); 477 } 478 479 static int 480 ng_int16_getDefault(const struct ng_parse_type *type, 481 const u_char *const start, u_char *buf, int *buflen) 482 { 483 int16_t val; 484 485 if (*buflen < sizeof(int16_t)) 486 return (ERANGE); 487 val = 0; 488 bcopy(&val, buf, sizeof(int16_t)); 489 *buflen = sizeof(int16_t); 490 return (0); 491 } 492 493 static int 494 ng_int16_getAlign(const struct ng_parse_type *type) 495 { 496 return INT16_ALIGNMENT; 497 } 498 499 const struct ng_parse_type ng_parse_int16_type = { 500 NULL, 501 (void *)INT_SIGNED, 502 NULL, 503 ng_int16_parse, 504 ng_int16_unparse, 505 ng_int16_getDefault, 506 ng_int16_getAlign 507 }; 508 509 const struct ng_parse_type ng_parse_uint16_type = { 510 &ng_parse_int16_type, 511 (void *)INT_UNSIGNED 512 }; 513 514 const struct ng_parse_type ng_parse_hint16_type = { 515 &ng_parse_int16_type, 516 (void *)INT_HEX 517 }; 518 519 /************************************************************************ 520 INT32 TYPE 521 ************************************************************************/ 522 523 static int 524 ng_int32_parse(const struct ng_parse_type *type, 525 const char *s, int *off, const u_char *const start, 526 u_char *const buf, int *buflen) 527 { 528 long val; /* assumes long is at least 32 bits */ 529 int32_t val32; 530 char *eptr; 531 532 if ((intptr_t)type->info == INT_SIGNED) 533 val = strtol(s + *off, &eptr, 0); 534 else 535 val = strtoul(s + *off, &eptr, 0); 536 if (val < (int32_t)0x80000000 537 || val > (u_int32_t)0xffffffff || eptr == s + *off) 538 return (EINVAL); 539 *off = eptr - s; 540 val32 = (int32_t)val; 541 bcopy(&val32, buf, sizeof(int32_t)); 542 *buflen = sizeof(int32_t); 543 return (0); 544 } 545 546 static int 547 ng_int32_unparse(const struct ng_parse_type *type, 548 const u_char *data, int *off, char *cbuf, int cbuflen) 549 { 550 const char *fmt; 551 long fval; 552 int error; 553 int32_t val; 554 555 bcopy(data + *off, &val, sizeof(int32_t)); 556 switch ((intptr_t)type->info) { 557 case INT_SIGNED: 558 fmt = "%ld"; 559 fval = val; 560 break; 561 case INT_UNSIGNED: 562 fmt = "%lu"; 563 fval = (u_int32_t)val; 564 break; 565 case INT_HEX: 566 fmt = "0x%lx"; 567 fval = (u_int32_t)val; 568 break; 569 default: 570 panic("%s: unknown type", __func__); 571 } 572 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 573 return (error); 574 *off += sizeof(int32_t); 575 return (0); 576 } 577 578 static int 579 ng_int32_getDefault(const struct ng_parse_type *type, 580 const u_char *const start, u_char *buf, int *buflen) 581 { 582 int32_t val; 583 584 if (*buflen < sizeof(int32_t)) 585 return (ERANGE); 586 val = 0; 587 bcopy(&val, buf, sizeof(int32_t)); 588 *buflen = sizeof(int32_t); 589 return (0); 590 } 591 592 static int 593 ng_int32_getAlign(const struct ng_parse_type *type) 594 { 595 return INT32_ALIGNMENT; 596 } 597 598 const struct ng_parse_type ng_parse_int32_type = { 599 NULL, 600 (void *)INT_SIGNED, 601 NULL, 602 ng_int32_parse, 603 ng_int32_unparse, 604 ng_int32_getDefault, 605 ng_int32_getAlign 606 }; 607 608 const struct ng_parse_type ng_parse_uint32_type = { 609 &ng_parse_int32_type, 610 (void *)INT_UNSIGNED 611 }; 612 613 const struct ng_parse_type ng_parse_hint32_type = { 614 &ng_parse_int32_type, 615 (void *)INT_HEX 616 }; 617 618 /************************************************************************ 619 INT64 TYPE 620 ************************************************************************/ 621 622 static int 623 ng_int64_parse(const struct ng_parse_type *type, 624 const char *s, int *off, const u_char *const start, 625 u_char *const buf, int *buflen) 626 { 627 quad_t val; 628 int64_t val64; 629 char *eptr; 630 631 val = strtoq(s + *off, &eptr, 0); 632 if (eptr == s + *off) 633 return (EINVAL); 634 *off = eptr - s; 635 val64 = (int64_t)val; 636 bcopy(&val64, buf, sizeof(int64_t)); 637 *buflen = sizeof(int64_t); 638 return (0); 639 } 640 641 static int 642 ng_int64_unparse(const struct ng_parse_type *type, 643 const u_char *data, int *off, char *cbuf, int cbuflen) 644 { 645 const char *fmt; 646 long long fval; 647 int64_t val; 648 int error; 649 650 bcopy(data + *off, &val, sizeof(int64_t)); 651 switch ((intptr_t)type->info) { 652 case INT_SIGNED: 653 fmt = "%lld"; 654 fval = val; 655 break; 656 case INT_UNSIGNED: 657 fmt = "%llu"; 658 fval = (u_int64_t)val; 659 break; 660 case INT_HEX: 661 fmt = "0x%llx"; 662 fval = (u_int64_t)val; 663 break; 664 default: 665 panic("%s: unknown type", __func__); 666 } 667 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 668 return (error); 669 *off += sizeof(int64_t); 670 return (0); 671 } 672 673 static int 674 ng_int64_getDefault(const struct ng_parse_type *type, 675 const u_char *const start, u_char *buf, int *buflen) 676 { 677 int64_t val; 678 679 if (*buflen < sizeof(int64_t)) 680 return (ERANGE); 681 val = 0; 682 bcopy(&val, buf, sizeof(int64_t)); 683 *buflen = sizeof(int64_t); 684 return (0); 685 } 686 687 static int 688 ng_int64_getAlign(const struct ng_parse_type *type) 689 { 690 return INT64_ALIGNMENT; 691 } 692 693 const struct ng_parse_type ng_parse_int64_type = { 694 NULL, 695 (void *)INT_SIGNED, 696 NULL, 697 ng_int64_parse, 698 ng_int64_unparse, 699 ng_int64_getDefault, 700 ng_int64_getAlign 701 }; 702 703 const struct ng_parse_type ng_parse_uint64_type = { 704 &ng_parse_int64_type, 705 (void *)INT_UNSIGNED 706 }; 707 708 const struct ng_parse_type ng_parse_hint64_type = { 709 &ng_parse_int64_type, 710 (void *)INT_HEX 711 }; 712 713 /************************************************************************ 714 STRING TYPE 715 ************************************************************************/ 716 717 static int 718 ng_string_parse(const struct ng_parse_type *type, 719 const char *s, int *off, const u_char *const start, 720 u_char *const buf, int *buflen) 721 { 722 char *sval; 723 int len; 724 int slen; 725 726 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 727 return (EINVAL); 728 *off += len; 729 bcopy(sval, buf, slen + 1); 730 free(sval, M_NETGRAPH_PARSE); 731 *buflen = slen + 1; 732 return (0); 733 } 734 735 static int 736 ng_string_unparse(const struct ng_parse_type *type, 737 const u_char *data, int *off, char *cbuf, int cbuflen) 738 { 739 const char *const raw = (const char *)data + *off; 740 char *const s = ng_encode_string(raw, strlen(raw)); 741 int error; 742 743 if (s == NULL) 744 return (ENOMEM); 745 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 746 free(s, M_NETGRAPH_PARSE); 747 return (error); 748 } 749 *off += strlen(raw) + 1; 750 free(s, M_NETGRAPH_PARSE); 751 return (0); 752 } 753 754 static int 755 ng_string_getDefault(const struct ng_parse_type *type, 756 const u_char *const start, u_char *buf, int *buflen) 757 { 758 759 if (*buflen < 1) 760 return (ERANGE); 761 buf[0] = (u_char)'\0'; 762 *buflen = 1; 763 return (0); 764 } 765 766 const struct ng_parse_type ng_parse_string_type = { 767 NULL, 768 NULL, 769 NULL, 770 ng_string_parse, 771 ng_string_unparse, 772 ng_string_getDefault, 773 NULL 774 }; 775 776 /************************************************************************ 777 FIXED BUFFER STRING TYPE 778 ************************************************************************/ 779 780 static int 781 ng_fixedstring_parse(const struct ng_parse_type *type, 782 const char *s, int *off, const u_char *const start, 783 u_char *const buf, int *buflen) 784 { 785 const struct ng_parse_fixedstring_info *const fi = type->info; 786 char *sval; 787 int len; 788 int slen; 789 790 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 791 return (EINVAL); 792 if (slen + 1 > fi->bufSize) { 793 free(sval, M_NETGRAPH_PARSE); 794 return (E2BIG); 795 } 796 *off += len; 797 bcopy(sval, buf, slen); 798 free(sval, M_NETGRAPH_PARSE); 799 bzero(buf + slen, fi->bufSize - slen); 800 *buflen = fi->bufSize; 801 return (0); 802 } 803 804 static int 805 ng_fixedstring_unparse(const struct ng_parse_type *type, 806 const u_char *data, int *off, char *cbuf, int cbuflen) 807 { 808 const struct ng_parse_fixedstring_info *const fi = type->info; 809 int error, temp = *off; 810 811 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 812 return (error); 813 *off += fi->bufSize; 814 return (0); 815 } 816 817 static int 818 ng_fixedstring_getDefault(const struct ng_parse_type *type, 819 const u_char *const start, u_char *buf, int *buflen) 820 { 821 const struct ng_parse_fixedstring_info *const fi = type->info; 822 823 if (*buflen < fi->bufSize) 824 return (ERANGE); 825 bzero(buf, fi->bufSize); 826 *buflen = fi->bufSize; 827 return (0); 828 } 829 830 const struct ng_parse_type ng_parse_fixedstring_type = { 831 NULL, 832 NULL, 833 NULL, 834 ng_fixedstring_parse, 835 ng_fixedstring_unparse, 836 ng_fixedstring_getDefault, 837 NULL 838 }; 839 840 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 841 NG_NODESIZ 842 }; 843 const struct ng_parse_type ng_parse_nodebuf_type = { 844 &ng_parse_fixedstring_type, 845 &ng_parse_nodebuf_info 846 }; 847 848 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 849 NG_HOOKSIZ 850 }; 851 const struct ng_parse_type ng_parse_hookbuf_type = { 852 &ng_parse_fixedstring_type, 853 &ng_parse_hookbuf_info 854 }; 855 856 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 857 NG_PATHSIZ 858 }; 859 const struct ng_parse_type ng_parse_pathbuf_type = { 860 &ng_parse_fixedstring_type, 861 &ng_parse_pathbuf_info 862 }; 863 864 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 865 NG_TYPESIZ 866 }; 867 const struct ng_parse_type ng_parse_typebuf_type = { 868 &ng_parse_fixedstring_type, 869 &ng_parse_typebuf_info 870 }; 871 872 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 873 NG_CMDSTRSIZ 874 }; 875 const struct ng_parse_type ng_parse_cmdbuf_type = { 876 &ng_parse_fixedstring_type, 877 &ng_parse_cmdbuf_info 878 }; 879 880 /************************************************************************ 881 EXPLICITLY SIZED STRING TYPE 882 ************************************************************************/ 883 884 static int 885 ng_sizedstring_parse(const struct ng_parse_type *type, 886 const char *s, int *off, const u_char *const start, 887 u_char *const buf, int *buflen) 888 { 889 char *sval; 890 int len; 891 int slen; 892 893 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 894 return (EINVAL); 895 if (slen > USHRT_MAX) { 896 free(sval, M_NETGRAPH_PARSE); 897 return (EINVAL); 898 } 899 *off += len; 900 *((u_int16_t *)buf) = (u_int16_t)slen; 901 bcopy(sval, buf + 2, slen); 902 free(sval, M_NETGRAPH_PARSE); 903 *buflen = 2 + slen; 904 return (0); 905 } 906 907 static int 908 ng_sizedstring_unparse(const struct ng_parse_type *type, 909 const u_char *data, int *off, char *cbuf, int cbuflen) 910 { 911 const char *const raw = (const char *)data + *off + 2; 912 const int slen = *((const u_int16_t *)(data + *off)); 913 char *const s = ng_encode_string(raw, slen); 914 int error; 915 916 if (s == NULL) 917 return (ENOMEM); 918 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 919 free(s, M_NETGRAPH_PARSE); 920 return (error); 921 } 922 free(s, M_NETGRAPH_PARSE); 923 *off += slen + 2; 924 return (0); 925 } 926 927 static int 928 ng_sizedstring_getDefault(const struct ng_parse_type *type, 929 const u_char *const start, u_char *buf, int *buflen) 930 { 931 if (*buflen < 2) 932 return (ERANGE); 933 bzero(buf, 2); 934 *buflen = 2; 935 return (0); 936 } 937 938 const struct ng_parse_type ng_parse_sizedstring_type = { 939 NULL, 940 NULL, 941 NULL, 942 ng_sizedstring_parse, 943 ng_sizedstring_unparse, 944 ng_sizedstring_getDefault, 945 NULL 946 }; 947 948 /************************************************************************ 949 IP ADDRESS TYPE 950 ************************************************************************/ 951 952 static int 953 ng_ipaddr_parse(const struct ng_parse_type *type, 954 const char *s, int *off, const u_char *const start, 955 u_char *const buf, int *buflen) 956 { 957 int i, error; 958 959 for (i = 0; i < 4; i++) { 960 if ((error = ng_int8_parse(&ng_parse_int8_type, 961 s, off, start, buf + i, buflen)) != 0) 962 return (error); 963 if (i < 3) { 964 if (s[*off] != '.') 965 return (EINVAL); 966 (*off)++; 967 } 968 } 969 *buflen = 4; 970 return (0); 971 } 972 973 static int 974 ng_ipaddr_unparse(const struct ng_parse_type *type, 975 const u_char *data, int *off, char *cbuf, int cbuflen) 976 { 977 struct in_addr ip; 978 int error; 979 980 bcopy(data + *off, &ip, sizeof(ip)); 981 if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d", 982 ((u_char *)&ip)[0], ((u_char *)&ip)[1], 983 ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0) 984 return (error); 985 *off += sizeof(ip); 986 return (0); 987 } 988 989 static int 990 ng_ipaddr_getDefault(const struct ng_parse_type *type, 991 const u_char *const start, u_char *buf, int *buflen) 992 { 993 struct in_addr ip = { 0 }; 994 995 if (*buflen < sizeof(ip)) 996 return (ERANGE); 997 bcopy(&ip, buf, sizeof(ip)); 998 *buflen = sizeof(ip); 999 return (0); 1000 } 1001 1002 const struct ng_parse_type ng_parse_ipaddr_type = { 1003 NULL, 1004 NULL, 1005 NULL, 1006 ng_ipaddr_parse, 1007 ng_ipaddr_unparse, 1008 ng_ipaddr_getDefault, 1009 ng_int32_getAlign 1010 }; 1011 1012 /************************************************************************ 1013 ETHERNET ADDRESS TYPE 1014 ************************************************************************/ 1015 1016 static int 1017 ng_enaddr_parse(const struct ng_parse_type *type, 1018 const char *s, int *const off, const u_char *const start, 1019 u_char *const buf, int *const buflen) 1020 { 1021 char *eptr; 1022 u_long val; 1023 int i; 1024 1025 if (*buflen < ETHER_ADDR_LEN) 1026 return (ERANGE); 1027 for (i = 0; i < ETHER_ADDR_LEN; i++) { 1028 val = strtoul(s + *off, &eptr, 16); 1029 if (val > 0xff || eptr == s + *off) 1030 return (EINVAL); 1031 buf[i] = (u_char)val; 1032 *off = (eptr - s); 1033 if (i < ETHER_ADDR_LEN - 1) { 1034 if (*eptr != ':') 1035 return (EINVAL); 1036 (*off)++; 1037 } 1038 } 1039 *buflen = ETHER_ADDR_LEN; 1040 return (0); 1041 } 1042 1043 static int 1044 ng_enaddr_unparse(const struct ng_parse_type *type, 1045 const u_char *data, int *off, char *cbuf, int cbuflen) 1046 { 1047 int len; 1048 1049 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 1050 data[*off], data[*off + 1], data[*off + 2], 1051 data[*off + 3], data[*off + 4], data[*off + 5]); 1052 if (len >= cbuflen) 1053 return (ERANGE); 1054 *off += ETHER_ADDR_LEN; 1055 return (0); 1056 } 1057 1058 const struct ng_parse_type ng_parse_enaddr_type = { 1059 NULL, 1060 NULL, 1061 NULL, 1062 ng_enaddr_parse, 1063 ng_enaddr_unparse, 1064 NULL, 1065 0 1066 }; 1067 1068 /************************************************************************ 1069 BYTE ARRAY TYPE 1070 ************************************************************************/ 1071 1072 /* Get the length of a byte array */ 1073 static int 1074 ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type, 1075 const u_char *start, const u_char *buf) 1076 { 1077 ng_parse_array_getLength_t *const getLength = type->private; 1078 1079 return (*getLength)(type, start, buf); 1080 } 1081 1082 /* Byte array element type is hex int8 */ 1083 static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = { 1084 &ng_parse_hint8_type, 1085 &ng_parse_bytearray_subtype_getLength, 1086 NULL 1087 }; 1088 static const struct ng_parse_type ng_parse_bytearray_subtype = { 1089 &ng_parse_array_type, 1090 &ng_parse_bytearray_subtype_info 1091 }; 1092 1093 static int 1094 ng_bytearray_parse(const struct ng_parse_type *type, 1095 const char *s, int *off, const u_char *const start, 1096 u_char *const buf, int *buflen) 1097 { 1098 char *str; 1099 int toklen; 1100 int slen; 1101 1102 /* We accept either an array of bytes or a string constant */ 1103 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) { 1104 ng_parse_array_getLength_t *const getLength = type->info; 1105 int arraylen; 1106 1107 arraylen = (*getLength)(type, start, buf); 1108 if (arraylen > *buflen) { 1109 free(str, M_NETGRAPH_PARSE); 1110 return (ERANGE); 1111 } 1112 if (slen > arraylen) { 1113 free(str, M_NETGRAPH_PARSE); 1114 return (E2BIG); 1115 } 1116 bcopy(str, buf, slen); 1117 bzero(buf + slen, arraylen - slen); 1118 free(str, M_NETGRAPH_PARSE); 1119 *off += toklen; 1120 *buflen = arraylen; 1121 return (0); 1122 } else { 1123 struct ng_parse_type subtype; 1124 1125 subtype = ng_parse_bytearray_subtype; 1126 subtype.private = __DECONST(void *, type->info); 1127 return ng_array_parse(&subtype, s, off, start, buf, buflen); 1128 } 1129 } 1130 1131 static int 1132 ng_bytearray_unparse(const struct ng_parse_type *type, 1133 const u_char *data, int *off, char *cbuf, int cbuflen) 1134 { 1135 struct ng_parse_type subtype; 1136 1137 subtype = ng_parse_bytearray_subtype; 1138 subtype.private = __DECONST(void *, type->info); 1139 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen); 1140 } 1141 1142 static int 1143 ng_bytearray_getDefault(const struct ng_parse_type *type, 1144 const u_char *const start, u_char *buf, int *buflen) 1145 { 1146 struct ng_parse_type subtype; 1147 1148 subtype = ng_parse_bytearray_subtype; 1149 subtype.private = __DECONST(void *, type->info); 1150 return ng_array_getDefault(&subtype, start, buf, buflen); 1151 } 1152 1153 const struct ng_parse_type ng_parse_bytearray_type = { 1154 NULL, 1155 NULL, 1156 NULL, 1157 ng_bytearray_parse, 1158 ng_bytearray_unparse, 1159 ng_bytearray_getDefault, 1160 NULL 1161 }; 1162 1163 /************************************************************************ 1164 STRUCT NG_MESG TYPE 1165 ************************************************************************/ 1166 1167 /* Get msg->header.arglen when "buf" is pointing to msg->data */ 1168 static int 1169 ng_parse_ng_mesg_getLength(const struct ng_parse_type *type, 1170 const u_char *start, const u_char *buf) 1171 { 1172 const struct ng_mesg *msg; 1173 1174 msg = (const struct ng_mesg *)(buf - sizeof(*msg)); 1175 return msg->header.arglen; 1176 } 1177 1178 /* Type for the variable length data portion of a struct ng_mesg */ 1179 static const struct ng_parse_type ng_msg_data_type = { 1180 &ng_parse_bytearray_type, 1181 &ng_parse_ng_mesg_getLength 1182 }; 1183 1184 /* Type for the entire struct ng_mesg header with data section */ 1185 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1186 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1187 const struct ng_parse_type ng_parse_ng_mesg_type = { 1188 &ng_parse_struct_type, 1189 &ng_parse_ng_mesg_type_fields, 1190 }; 1191 1192 /************************************************************************ 1193 COMPOSITE HELPER ROUTINES 1194 ************************************************************************/ 1195 1196 /* 1197 * Convert a structure or array from ASCII to binary 1198 */ 1199 static int 1200 ng_parse_composite(const struct ng_parse_type *type, const char *s, 1201 int *off, const u_char *const start, u_char *const buf, int *buflen, 1202 const enum comptype ctype) 1203 { 1204 const int num = ng_get_composite_len(type, start, buf, ctype); 1205 int nextIndex = 0; /* next implicit array index */ 1206 u_int index; /* field or element index */ 1207 int *foff; /* field value offsets in string */ 1208 int align, len, blen, error = 0; 1209 1210 /* Initialize */ 1211 foff = malloc(num * sizeof(*foff), M_NETGRAPH_PARSE, M_NOWAIT | M_ZERO); 1212 if (foff == NULL) { 1213 error = ENOMEM; 1214 goto done; 1215 } 1216 1217 /* Get opening brace/bracket */ 1218 if (ng_parse_get_token(s, off, &len) 1219 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) { 1220 error = EINVAL; 1221 goto done; 1222 } 1223 *off += len; 1224 1225 /* Get individual element value positions in the string */ 1226 for (;;) { 1227 enum ng_parse_token tok; 1228 1229 /* Check for closing brace/bracket */ 1230 tok = ng_parse_get_token(s, off, &len); 1231 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) { 1232 *off += len; 1233 break; 1234 } 1235 1236 /* For arrays, the 'name' (ie, index) is optional, so 1237 distinguish name from values by seeing if the next 1238 token is an equals sign */ 1239 if (ctype != CT_STRUCT) { 1240 u_long ul; 1241 int len2, off2; 1242 char *eptr; 1243 1244 /* If an opening brace/bracket, index is implied */ 1245 if (tok == T_LBRACE || tok == T_LBRACKET) { 1246 index = nextIndex++; 1247 goto gotIndex; 1248 } 1249 1250 /* Might be an index, might be a value, either way... */ 1251 if (tok != T_WORD) { 1252 error = EINVAL; 1253 goto done; 1254 } 1255 1256 /* If no equals sign follows, index is implied */ 1257 off2 = *off + len; 1258 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) { 1259 index = nextIndex++; 1260 goto gotIndex; 1261 } 1262 1263 /* Index was specified explicitly; parse it */ 1264 ul = strtoul(s + *off, &eptr, 0); 1265 if (ul == ULONG_MAX || eptr - (s + *off) != len) { 1266 error = EINVAL; 1267 goto done; 1268 } 1269 index = (u_int)ul; 1270 nextIndex = index + 1; 1271 *off += len + len2; 1272 } else { /* a structure field */ 1273 const struct ng_parse_struct_field *const 1274 fields = type->info; 1275 1276 /* Find the field by name (required) in field list */ 1277 if (tok != T_WORD) { 1278 error = EINVAL; 1279 goto done; 1280 } 1281 for (index = 0; index < num; index++) { 1282 const struct ng_parse_struct_field *const 1283 field = &fields[index]; 1284 1285 if (strncmp(&s[*off], field->name, len) == 0 1286 && field->name[len] == '\0') 1287 break; 1288 } 1289 if (index == num) { 1290 error = ENOENT; 1291 goto done; 1292 } 1293 *off += len; 1294 1295 /* Get equals sign */ 1296 if (ng_parse_get_token(s, off, &len) != T_EQUALS) { 1297 error = EINVAL; 1298 goto done; 1299 } 1300 *off += len; 1301 } 1302 gotIndex: 1303 1304 /* Check array index */ 1305 if (index >= num) { 1306 error = E2BIG; 1307 goto done; 1308 } 1309 1310 /* Save value's position and skip over it for now */ 1311 if (foff[index] != 0) { 1312 error = EALREADY; /* duplicate */ 1313 goto done; 1314 } 1315 while (isspace(s[*off])) 1316 (*off)++; 1317 foff[index] = *off; 1318 if ((error = ng_parse_skip_value(s, *off, &len)) != 0) 1319 goto done; 1320 *off += len; 1321 } 1322 1323 /* Now build binary structure from supplied values and defaults */ 1324 for (blen = index = 0; index < num; index++) { 1325 const struct ng_parse_type *const 1326 etype = ng_get_composite_etype(type, index, ctype); 1327 int k, pad, vlen; 1328 1329 /* Zero-pad any alignment bytes */ 1330 pad = ng_parse_get_elem_pad(type, index, ctype, blen); 1331 for (k = 0; k < pad; k++) { 1332 if (blen >= *buflen) { 1333 error = ERANGE; 1334 goto done; 1335 } 1336 buf[blen++] = 0; 1337 } 1338 1339 /* Get value */ 1340 vlen = *buflen - blen; 1341 if (foff[index] == 0) { /* use default value */ 1342 error = ng_get_composite_elem_default(type, index, 1343 start, buf + blen, &vlen, ctype); 1344 } else { /* parse given value */ 1345 *off = foff[index]; 1346 error = INVOKE(etype, parse)(etype, 1347 s, off, start, buf + blen, &vlen); 1348 } 1349 if (error != 0) 1350 goto done; 1351 blen += vlen; 1352 } 1353 1354 /* Make total composite structure size a multiple of its alignment */ 1355 if ((align = ALIGNMENT(type)) != 0) { 1356 while (blen % align != 0) { 1357 if (blen >= *buflen) { 1358 error = ERANGE; 1359 goto done; 1360 } 1361 buf[blen++] = 0; 1362 } 1363 } 1364 1365 /* Done */ 1366 *buflen = blen; 1367 done: 1368 if (foff != NULL) 1369 free(foff, M_NETGRAPH_PARSE); 1370 return (error); 1371 } 1372 1373 /* 1374 * Convert an array or structure from binary to ASCII 1375 */ 1376 static int 1377 ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, 1378 int *off, char *cbuf, int cbuflen, const enum comptype ctype) 1379 { 1380 const struct ng_mesg *const hdr 1381 = (const struct ng_mesg *)(data - sizeof(*hdr)); 1382 const int num = ng_get_composite_len(type, data, data + *off, ctype); 1383 const int workSize = 20 * 1024; /* XXX hard coded constant */ 1384 int nextIndex = 0, didOne = 0; 1385 int error, index; 1386 u_char *workBuf; 1387 1388 /* Get workspace for checking default values */ 1389 workBuf = malloc(workSize, M_NETGRAPH_PARSE, M_NOWAIT); 1390 if (workBuf == NULL) 1391 return (ENOMEM); 1392 1393 /* Opening brace/bracket */ 1394 if ((error = ng_parse_append(&cbuf, &cbuflen, "%c", 1395 (ctype == CT_STRUCT) ? '{' : '[')) != 0) 1396 goto fail; 1397 1398 /* Do each item */ 1399 for (index = 0; index < num; index++) { 1400 const struct ng_parse_type *const 1401 etype = ng_get_composite_etype(type, index, ctype); 1402 1403 /* Skip any alignment pad bytes */ 1404 *off += ng_parse_get_elem_pad(type, index, ctype, *off); 1405 1406 /* 1407 * See if element is equal to its default value; skip if so. 1408 * Copy struct ng_mesg header for types that peek into it. 1409 */ 1410 if (sizeof(*hdr) + *off < workSize) { 1411 int tempsize = workSize - sizeof(*hdr) - *off; 1412 1413 bcopy(hdr, workBuf, sizeof(*hdr) + *off); 1414 if (ng_get_composite_elem_default(type, index, workBuf 1415 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off, 1416 &tempsize, ctype) == 0 1417 && bcmp(workBuf + sizeof(*hdr) + *off, 1418 data + *off, tempsize) == 0) { 1419 *off += tempsize; 1420 continue; 1421 } 1422 } 1423 1424 /* Print name= */ 1425 if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0) 1426 goto fail; 1427 if (ctype != CT_STRUCT) { 1428 if (index != nextIndex) { 1429 nextIndex = index; 1430 if ((error = ng_parse_append(&cbuf, 1431 &cbuflen, "%d=", index)) != 0) 1432 goto fail; 1433 } 1434 nextIndex++; 1435 } else { 1436 const struct ng_parse_struct_field *const 1437 fields = type->info; 1438 1439 if ((error = ng_parse_append(&cbuf, 1440 &cbuflen, "%s=", fields[index].name)) != 0) 1441 goto fail; 1442 } 1443 1444 /* Print value */ 1445 if ((error = INVOKE(etype, unparse) 1446 (etype, data, off, cbuf, cbuflen)) != 0) { 1447 free(workBuf, M_NETGRAPH_PARSE); 1448 return (error); 1449 } 1450 cbuflen -= strlen(cbuf); 1451 cbuf += strlen(cbuf); 1452 didOne = 1; 1453 } 1454 1455 /* Closing brace/bracket */ 1456 error = ng_parse_append(&cbuf, &cbuflen, "%s%c", 1457 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']'); 1458 1459 fail: 1460 /* Clean up after failure */ 1461 free(workBuf, M_NETGRAPH_PARSE); 1462 return (error); 1463 } 1464 1465 /* 1466 * Generate the default value for an element of an array or structure 1467 * Returns EOPNOTSUPP if default value is unspecified. 1468 */ 1469 static int 1470 ng_get_composite_elem_default(const struct ng_parse_type *type, 1471 int index, const u_char *const start, u_char *buf, int *buflen, 1472 const enum comptype ctype) 1473 { 1474 const struct ng_parse_type *etype; 1475 ng_getDefault_t *func; 1476 1477 switch (ctype) { 1478 case CT_STRUCT: 1479 break; 1480 case CT_ARRAY: 1481 { 1482 const struct ng_parse_array_info *const ai = type->info; 1483 1484 if (ai->getDefault != NULL) { 1485 return (*ai->getDefault)(type, 1486 index, start, buf, buflen); 1487 } 1488 break; 1489 } 1490 case CT_FIXEDARRAY: 1491 { 1492 const struct ng_parse_fixedarray_info *const fi = type->info; 1493 1494 if (*fi->getDefault != NULL) { 1495 return (*fi->getDefault)(type, 1496 index, start, buf, buflen); 1497 } 1498 break; 1499 } 1500 default: 1501 panic("%s", __func__); 1502 } 1503 1504 /* Default to element type default */ 1505 etype = ng_get_composite_etype(type, index, ctype); 1506 func = METHOD(etype, getDefault); 1507 if (func == NULL) 1508 return (EOPNOTSUPP); 1509 return (*func)(etype, start, buf, buflen); 1510 } 1511 1512 /* 1513 * Get the number of elements in a struct, variable or fixed array. 1514 */ 1515 static int 1516 ng_get_composite_len(const struct ng_parse_type *type, 1517 const u_char *const start, const u_char *buf, 1518 const enum comptype ctype) 1519 { 1520 switch (ctype) { 1521 case CT_STRUCT: 1522 { 1523 const struct ng_parse_struct_field *const fields = type->info; 1524 int numFields = 0; 1525 1526 for (numFields = 0; ; numFields++) { 1527 const struct ng_parse_struct_field *const 1528 fi = &fields[numFields]; 1529 1530 if (fi->name == NULL) 1531 break; 1532 } 1533 return (numFields); 1534 } 1535 case CT_ARRAY: 1536 { 1537 const struct ng_parse_array_info *const ai = type->info; 1538 1539 return (*ai->getLength)(type, start, buf); 1540 } 1541 case CT_FIXEDARRAY: 1542 { 1543 const struct ng_parse_fixedarray_info *const fi = type->info; 1544 1545 return fi->length; 1546 } 1547 default: 1548 panic("%s", __func__); 1549 } 1550 return (0); 1551 } 1552 1553 /* 1554 * Return the type of the index'th element of a composite structure 1555 */ 1556 static const struct ng_parse_type * 1557 ng_get_composite_etype(const struct ng_parse_type *type, 1558 int index, const enum comptype ctype) 1559 { 1560 const struct ng_parse_type *etype = NULL; 1561 1562 switch (ctype) { 1563 case CT_STRUCT: 1564 { 1565 const struct ng_parse_struct_field *const fields = type->info; 1566 1567 etype = fields[index].type; 1568 break; 1569 } 1570 case CT_ARRAY: 1571 { 1572 const struct ng_parse_array_info *const ai = type->info; 1573 1574 etype = ai->elementType; 1575 break; 1576 } 1577 case CT_FIXEDARRAY: 1578 { 1579 const struct ng_parse_fixedarray_info *const fi = type->info; 1580 1581 etype = fi->elementType; 1582 break; 1583 } 1584 default: 1585 panic("%s", __func__); 1586 } 1587 return (etype); 1588 } 1589 1590 /* 1591 * Get the number of bytes to skip to align for the next 1592 * element in a composite structure. 1593 */ 1594 static int 1595 ng_parse_get_elem_pad(const struct ng_parse_type *type, 1596 int index, enum comptype ctype, int posn) 1597 { 1598 const struct ng_parse_type *const 1599 etype = ng_get_composite_etype(type, index, ctype); 1600 int align; 1601 1602 /* Get element's alignment, and possibly override */ 1603 align = ALIGNMENT(etype); 1604 if (ctype == CT_STRUCT) { 1605 const struct ng_parse_struct_field *const fields = type->info; 1606 1607 if (fields[index].alignment != 0) 1608 align = fields[index].alignment; 1609 } 1610 1611 /* Return number of bytes to skip to align */ 1612 return (align ? (align - (posn % align)) % align : 0); 1613 } 1614 1615 /************************************************************************ 1616 PARSING HELPER ROUTINES 1617 ************************************************************************/ 1618 1619 /* 1620 * Append to a fixed length string buffer. 1621 */ 1622 static int 1623 ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...) 1624 { 1625 va_list args; 1626 int len; 1627 1628 va_start(args, fmt); 1629 len = vsnprintf(*cbufp, *cbuflenp, fmt, args); 1630 va_end(args); 1631 if (len >= *cbuflenp) 1632 return ERANGE; 1633 *cbufp += len; 1634 *cbuflenp -= len; 1635 1636 return (0); 1637 } 1638 1639 /* 1640 * Skip over a value 1641 */ 1642 static int 1643 ng_parse_skip_value(const char *s, int off0, int *lenp) 1644 { 1645 int len, nbracket, nbrace; 1646 int off = off0; 1647 1648 len = nbracket = nbrace = 0; 1649 do { 1650 switch (ng_parse_get_token(s, &off, &len)) { 1651 case T_LBRACKET: 1652 nbracket++; 1653 break; 1654 case T_LBRACE: 1655 nbrace++; 1656 break; 1657 case T_RBRACKET: 1658 if (nbracket-- == 0) 1659 return (EINVAL); 1660 break; 1661 case T_RBRACE: 1662 if (nbrace-- == 0) 1663 return (EINVAL); 1664 break; 1665 case T_EOF: 1666 return (EINVAL); 1667 default: 1668 break; 1669 } 1670 off += len; 1671 } while (nbracket > 0 || nbrace > 0); 1672 *lenp = off - off0; 1673 return (0); 1674 } 1675 1676 /* 1677 * Find the next token in the string, starting at offset *startp. 1678 * Returns the token type, with *startp pointing to the first char 1679 * and *lenp the length. 1680 */ 1681 enum ng_parse_token 1682 ng_parse_get_token(const char *s, int *startp, int *lenp) 1683 { 1684 char *t; 1685 int i; 1686 1687 while (isspace(s[*startp])) 1688 (*startp)++; 1689 switch (s[*startp]) { 1690 case '\0': 1691 *lenp = 0; 1692 return T_EOF; 1693 case '{': 1694 *lenp = 1; 1695 return T_LBRACE; 1696 case '}': 1697 *lenp = 1; 1698 return T_RBRACE; 1699 case '[': 1700 *lenp = 1; 1701 return T_LBRACKET; 1702 case ']': 1703 *lenp = 1; 1704 return T_RBRACKET; 1705 case '=': 1706 *lenp = 1; 1707 return T_EQUALS; 1708 case '"': 1709 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL) 1710 return T_ERROR; 1711 free(t, M_NETGRAPH_PARSE); 1712 return T_STRING; 1713 default: 1714 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i]) 1715 && s[i] != '{' && s[i] != '}' && s[i] != '[' 1716 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++) 1717 ; 1718 *lenp = i - *startp; 1719 return T_WORD; 1720 } 1721 } 1722 1723 /* 1724 * Get a string token, which must be enclosed in double quotes. 1725 * The normal C backslash escapes are recognized. 1726 */ 1727 char * 1728 ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp) 1729 { 1730 char *cbuf, *p; 1731 int start, off; 1732 int slen; 1733 1734 while (isspace(s[*startp])) 1735 (*startp)++; 1736 start = *startp; 1737 if (s[*startp] != '"') 1738 return (NULL); 1739 cbuf = malloc(strlen(s + start), M_NETGRAPH_PARSE, M_NOWAIT); 1740 if (cbuf == NULL) 1741 return (NULL); 1742 strcpy(cbuf, s + start + 1); 1743 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) { 1744 if (*p == '"') { 1745 *p = '\0'; 1746 *lenp = off + 1; 1747 if (slenp != NULL) 1748 *slenp = slen; 1749 return (cbuf); 1750 } else if (p[0] == '\\' && p[1] != '\0') { 1751 int x, k; 1752 char *v; 1753 1754 strcpy(p, p + 1); 1755 v = p; 1756 switch (*p) { 1757 case 't': 1758 *v = '\t'; 1759 off++; 1760 continue; 1761 case 'n': 1762 *v = '\n'; 1763 off++; 1764 continue; 1765 case 'r': 1766 *v = '\r'; 1767 off++; 1768 continue; 1769 case 'v': 1770 *v = '\v'; 1771 off++; 1772 continue; 1773 case 'f': 1774 *v = '\f'; 1775 off++; 1776 continue; 1777 case '"': 1778 *v = '"'; 1779 off++; 1780 continue; 1781 case '0': case '1': case '2': case '3': 1782 case '4': case '5': case '6': case '7': 1783 for (x = k = 0; 1784 k < 3 && *v >= '0' && *v <= '7'; v++) { 1785 x = (x << 3) + (*v - '0'); 1786 off++; 1787 } 1788 *--v = (char)x; 1789 break; 1790 case 'x': 1791 for (v++, x = k = 0; 1792 k < 2 && isxdigit(*v); v++) { 1793 x = (x << 4) + (isdigit(*v) ? 1794 (*v - '0') : 1795 (tolower(*v) - 'a' + 10)); 1796 off++; 1797 } 1798 *--v = (char)x; 1799 break; 1800 default: 1801 continue; 1802 } 1803 strcpy(p, v); 1804 } 1805 } 1806 free(cbuf, M_NETGRAPH_PARSE); 1807 return (NULL); /* no closing quote */ 1808 } 1809 1810 /* 1811 * Encode a string so it can be safely put in double quotes. 1812 * Caller must free the result. Exactly "slen" characters 1813 * are encoded. 1814 */ 1815 char * 1816 ng_encode_string(const char *raw, int slen) 1817 { 1818 char *cbuf; 1819 int off = 0; 1820 int i; 1821 1822 cbuf = malloc(strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, M_NOWAIT); 1823 if (cbuf == NULL) 1824 return (NULL); 1825 cbuf[off++] = '"'; 1826 for (i = 0; i < slen; i++, raw++) { 1827 switch (*raw) { 1828 case '\t': 1829 cbuf[off++] = '\\'; 1830 cbuf[off++] = 't'; 1831 break; 1832 case '\f': 1833 cbuf[off++] = '\\'; 1834 cbuf[off++] = 'f'; 1835 break; 1836 case '\n': 1837 cbuf[off++] = '\\'; 1838 cbuf[off++] = 'n'; 1839 break; 1840 case '\r': 1841 cbuf[off++] = '\\'; 1842 cbuf[off++] = 'r'; 1843 break; 1844 case '\v': 1845 cbuf[off++] = '\\'; 1846 cbuf[off++] = 'v'; 1847 break; 1848 case '"': 1849 case '\\': 1850 cbuf[off++] = '\\'; 1851 cbuf[off++] = *raw; 1852 break; 1853 default: 1854 if (*raw < 0x20 || *raw > 0x7e) { 1855 off += sprintf(cbuf + off, 1856 "\\x%02x", (u_char)*raw); 1857 break; 1858 } 1859 cbuf[off++] = *raw; 1860 break; 1861 } 1862 } 1863 cbuf[off++] = '"'; 1864 cbuf[off] = '\0'; 1865 return (cbuf); 1866 } 1867 1868 /************************************************************************ 1869 VIRTUAL METHOD LOOKUP 1870 ************************************************************************/ 1871 1872 static ng_parse_t * 1873 ng_get_parse_method(const struct ng_parse_type *t) 1874 { 1875 while (t != NULL && t->parse == NULL) 1876 t = t->supertype; 1877 return (t ? t->parse : NULL); 1878 } 1879 1880 static ng_unparse_t * 1881 ng_get_unparse_method(const struct ng_parse_type *t) 1882 { 1883 while (t != NULL && t->unparse == NULL) 1884 t = t->supertype; 1885 return (t ? t->unparse : NULL); 1886 } 1887 1888 static ng_getDefault_t * 1889 ng_get_getDefault_method(const struct ng_parse_type *t) 1890 { 1891 while (t != NULL && t->getDefault == NULL) 1892 t = t->supertype; 1893 return (t ? t->getDefault : NULL); 1894 } 1895 1896 static ng_getAlign_t * 1897 ng_get_getAlign_method(const struct ng_parse_type *t) 1898 { 1899 while (t != NULL && t->getAlign == NULL) 1900 t = t->supertype; 1901 return (t ? t->getAlign : NULL); 1902 } 1903