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: src/sys/netgraph/ng_parse.c,v 1.30 2007/06/23 00:02:20 mjacob Exp $ 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 #include <sys/stdarg.h> 54 55 #include <net/ethernet.h> 56 57 #include <netinet/in.h> 58 59 #include <netgraph7/ng_message.h> 60 #include <netgraph7/netgraph.h> 61 #include <netgraph7/ng_parse.h> 62 63 #ifdef NG_SEPARATE_MALLOC 64 MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info"); 65 #else 66 #define M_NETGRAPH_PARSE M_NETGRAPH 67 #endif 68 69 /* Compute alignment for primitive integral types */ 70 struct int16_temp { 71 char x; 72 int16_t y; 73 }; 74 75 struct int32_temp { 76 char x; 77 int32_t y; 78 }; 79 80 struct int64_temp { 81 char x; 82 int64_t y; 83 }; 84 85 #define INT8_ALIGNMENT 1 86 #define INT16_ALIGNMENT __offsetof(struct int16_temp, y) 87 #define INT32_ALIGNMENT __offsetof(struct int32_temp, y) 88 #define INT64_ALIGNMENT __offsetof(struct int64_temp, y) 89 90 /* Output format for integral types */ 91 #define INT_UNSIGNED 0 92 #define INT_SIGNED 1 93 #define INT_HEX 2 94 95 /* Type of composite object: struct, array, or fixedarray */ 96 enum comptype { 97 CT_STRUCT, 98 CT_ARRAY, 99 CT_FIXEDARRAY, 100 }; 101 102 /* Composite types helper functions */ 103 static int ng_parse_composite(const struct ng_parse_type *type, 104 const char *s, int *off, const u_char *start, 105 u_char *const buf, int *buflen, enum comptype ctype); 106 static int ng_unparse_composite(const struct ng_parse_type *type, 107 const u_char *data, int *off, char *cbuf, int cbuflen, 108 enum comptype ctype); 109 static int ng_get_composite_elem_default(const struct ng_parse_type *type, 110 int index, const u_char *start, u_char *buf, 111 int *buflen, enum comptype ctype); 112 static int ng_get_composite_len(const struct ng_parse_type *type, 113 const u_char *start, const u_char *buf, 114 enum comptype ctype); 115 static const struct ng_parse_type *ng_get_composite_etype(const struct 116 ng_parse_type *type, int index, enum comptype ctype); 117 static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 118 int index, enum comptype ctype, int posn); 119 120 /* Parsing helper functions */ 121 static int ng_parse_skip_value(const char *s, int off, int *lenp); 122 static int ng_parse_append(char **cbufp, int *cbuflenp, 123 const char *fmt, ...) __printflike(3, 4); 124 125 /* Poor man's virtual method calls */ 126 #define METHOD(t,m) (ng_get_ ## m ## _method(t)) 127 #define INVOKE(t,m) (*METHOD(t,m)) 128 129 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 130 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 131 static ng_getDefault_t *ng_get_getDefault_method(const 132 struct ng_parse_type *t); 133 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 134 135 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 136 0 : INVOKE(t, getAlign)(t)) 137 138 /************************************************************************ 139 PUBLIC FUNCTIONS 140 ************************************************************************/ 141 142 /* 143 * Convert an ASCII string to binary according to the supplied type descriptor 144 */ 145 int 146 ng_parse(const struct ng_parse_type *type, 147 const char *string, int *off, u_char *buf, int *buflen) 148 { 149 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 150 } 151 152 /* 153 * Convert binary to an ASCII string according to the supplied type descriptor 154 */ 155 int 156 ng_unparse(const struct ng_parse_type *type, 157 const u_char *data, char *cbuf, int cbuflen) 158 { 159 int off = 0; 160 161 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 162 } 163 164 /* 165 * Fill in the default value according to the supplied type descriptor 166 */ 167 int 168 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 169 { 170 ng_getDefault_t *const func = METHOD(type, getDefault); 171 172 if (func == NULL) 173 return (EOPNOTSUPP); 174 return (*func)(type, buf, buf, buflen); 175 } 176 177 178 /************************************************************************ 179 STRUCTURE TYPE 180 ************************************************************************/ 181 182 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 #ifdef RESTARTABLE_PANICS 377 return(0); 378 #endif 379 } 380 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 381 return (error); 382 *off += sizeof(int8_t); 383 return (0); 384 } 385 386 static int 387 ng_int8_getDefault(const struct ng_parse_type *type, 388 const u_char *const start, u_char *buf, int *buflen) 389 { 390 int8_t val; 391 392 if (*buflen < sizeof(int8_t)) 393 return (ERANGE); 394 val = 0; 395 bcopy(&val, buf, sizeof(int8_t)); 396 *buflen = sizeof(int8_t); 397 return (0); 398 } 399 400 static int 401 ng_int8_getAlign(const struct ng_parse_type *type) 402 { 403 return INT8_ALIGNMENT; 404 } 405 406 const struct ng_parse_type ng_parse_int8_type = { 407 NULL, 408 (void *)INT_SIGNED, 409 NULL, 410 ng_int8_parse, 411 ng_int8_unparse, 412 ng_int8_getDefault, 413 ng_int8_getAlign 414 }; 415 416 const struct ng_parse_type ng_parse_uint8_type = { 417 &ng_parse_int8_type, 418 (void *)INT_UNSIGNED 419 }; 420 421 const struct ng_parse_type ng_parse_hint8_type = { 422 &ng_parse_int8_type, 423 (void *)INT_HEX 424 }; 425 426 /************************************************************************ 427 INT16 TYPE 428 ************************************************************************/ 429 430 static int 431 ng_int16_parse(const struct ng_parse_type *type, 432 const char *s, int *off, const u_char *const start, 433 u_char *const buf, int *buflen) 434 { 435 long val; 436 int16_t val16; 437 char *eptr; 438 439 val = strtol(s + *off, &eptr, 0); 440 if (val < (int16_t)0x8000 441 || val > (u_int16_t)0xffff || eptr == s + *off) 442 return (EINVAL); 443 *off = eptr - s; 444 val16 = (int16_t)val; 445 bcopy(&val16, buf, sizeof(int16_t)); 446 *buflen = sizeof(int16_t); 447 return (0); 448 } 449 450 static int 451 ng_int16_unparse(const struct ng_parse_type *type, 452 const u_char *data, int *off, char *cbuf, int cbuflen) 453 { 454 const char *fmt; 455 int fval; 456 int error; 457 int16_t val; 458 459 bcopy(data + *off, &val, sizeof(int16_t)); 460 switch ((intptr_t)type->info) { 461 case INT_SIGNED: 462 fmt = "%d"; 463 fval = val; 464 break; 465 case INT_UNSIGNED: 466 fmt = "%u"; 467 fval = (u_int16_t)val; 468 break; 469 case INT_HEX: 470 fmt = "0x%x"; 471 fval = (u_int16_t)val; 472 break; 473 default: 474 panic("%s: unknown type", __func__); 475 #ifdef RESTARTABLE_PANICS 476 return(0); 477 #endif 478 } 479 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 480 return (error); 481 *off += sizeof(int16_t); 482 return (0); 483 } 484 485 static int 486 ng_int16_getDefault(const struct ng_parse_type *type, 487 const u_char *const start, u_char *buf, int *buflen) 488 { 489 int16_t val; 490 491 if (*buflen < sizeof(int16_t)) 492 return (ERANGE); 493 val = 0; 494 bcopy(&val, buf, sizeof(int16_t)); 495 *buflen = sizeof(int16_t); 496 return (0); 497 } 498 499 static int 500 ng_int16_getAlign(const struct ng_parse_type *type) 501 { 502 return INT16_ALIGNMENT; 503 } 504 505 const struct ng_parse_type ng_parse_int16_type = { 506 NULL, 507 (void *)INT_SIGNED, 508 NULL, 509 ng_int16_parse, 510 ng_int16_unparse, 511 ng_int16_getDefault, 512 ng_int16_getAlign 513 }; 514 515 const struct ng_parse_type ng_parse_uint16_type = { 516 &ng_parse_int16_type, 517 (void *)INT_UNSIGNED 518 }; 519 520 const struct ng_parse_type ng_parse_hint16_type = { 521 &ng_parse_int16_type, 522 (void *)INT_HEX 523 }; 524 525 /************************************************************************ 526 INT32 TYPE 527 ************************************************************************/ 528 529 static int 530 ng_int32_parse(const struct ng_parse_type *type, 531 const char *s, int *off, const u_char *const start, 532 u_char *const buf, int *buflen) 533 { 534 long val; /* assumes long is at least 32 bits */ 535 int32_t val32; 536 char *eptr; 537 538 if ((intptr_t)type->info == INT_SIGNED) 539 val = strtol(s + *off, &eptr, 0); 540 else 541 val = strtoul(s + *off, &eptr, 0); 542 if (val < (int32_t)0x80000000 543 || val > (u_int32_t)0xffffffff || eptr == s + *off) 544 return (EINVAL); 545 *off = eptr - s; 546 val32 = (int32_t)val; 547 bcopy(&val32, buf, sizeof(int32_t)); 548 *buflen = sizeof(int32_t); 549 return (0); 550 } 551 552 static int 553 ng_int32_unparse(const struct ng_parse_type *type, 554 const u_char *data, int *off, char *cbuf, int cbuflen) 555 { 556 const char *fmt; 557 long fval; 558 int error; 559 int32_t val; 560 561 bcopy(data + *off, &val, sizeof(int32_t)); 562 switch ((intptr_t)type->info) { 563 case INT_SIGNED: 564 fmt = "%ld"; 565 fval = val; 566 break; 567 case INT_UNSIGNED: 568 fmt = "%lu"; 569 fval = (u_int32_t)val; 570 break; 571 case INT_HEX: 572 fmt = "0x%lx"; 573 fval = (u_int32_t)val; 574 break; 575 default: 576 panic("%s: unknown type", __func__); 577 #ifdef RESTARTABLE_PANICS 578 return(0); 579 #endif 580 } 581 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 582 return (error); 583 *off += sizeof(int32_t); 584 return (0); 585 } 586 587 static int 588 ng_int32_getDefault(const struct ng_parse_type *type, 589 const u_char *const start, u_char *buf, int *buflen) 590 { 591 int32_t val; 592 593 if (*buflen < sizeof(int32_t)) 594 return (ERANGE); 595 val = 0; 596 bcopy(&val, buf, sizeof(int32_t)); 597 *buflen = sizeof(int32_t); 598 return (0); 599 } 600 601 static int 602 ng_int32_getAlign(const struct ng_parse_type *type) 603 { 604 return INT32_ALIGNMENT; 605 } 606 607 const struct ng_parse_type ng_parse_int32_type = { 608 NULL, 609 (void *)INT_SIGNED, 610 NULL, 611 ng_int32_parse, 612 ng_int32_unparse, 613 ng_int32_getDefault, 614 ng_int32_getAlign 615 }; 616 617 const struct ng_parse_type ng_parse_uint32_type = { 618 &ng_parse_int32_type, 619 (void *)INT_UNSIGNED 620 }; 621 622 const struct ng_parse_type ng_parse_hint32_type = { 623 &ng_parse_int32_type, 624 (void *)INT_HEX 625 }; 626 627 /************************************************************************ 628 INT64 TYPE 629 ************************************************************************/ 630 631 static int 632 ng_int64_parse(const struct ng_parse_type *type, 633 const char *s, int *off, const u_char *const start, 634 u_char *const buf, int *buflen) 635 { 636 quad_t val; 637 int64_t val64; 638 char *eptr; 639 640 val = strtoq(s + *off, &eptr, 0); 641 if (eptr == s + *off) 642 return (EINVAL); 643 *off = eptr - s; 644 val64 = (int64_t)val; 645 bcopy(&val64, buf, sizeof(int64_t)); 646 *buflen = sizeof(int64_t); 647 return (0); 648 } 649 650 static int 651 ng_int64_unparse(const struct ng_parse_type *type, 652 const u_char *data, int *off, char *cbuf, int cbuflen) 653 { 654 const char *fmt; 655 long long fval; 656 int64_t val; 657 int error; 658 659 bcopy(data + *off, &val, sizeof(int64_t)); 660 switch ((intptr_t)type->info) { 661 case INT_SIGNED: 662 fmt = "%lld"; 663 fval = val; 664 break; 665 case INT_UNSIGNED: 666 fmt = "%llu"; 667 fval = (u_int64_t)val; 668 break; 669 case INT_HEX: 670 fmt = "0x%llx"; 671 fval = (u_int64_t)val; 672 break; 673 default: 674 panic("%s: unknown type", __func__); 675 #ifdef RESTARTABLE_PANICS 676 return(0); 677 #endif 678 } 679 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0) 680 return (error); 681 *off += sizeof(int64_t); 682 return (0); 683 } 684 685 static int 686 ng_int64_getDefault(const struct ng_parse_type *type, 687 const u_char *const start, u_char *buf, int *buflen) 688 { 689 int64_t val; 690 691 if (*buflen < sizeof(int64_t)) 692 return (ERANGE); 693 val = 0; 694 bcopy(&val, buf, sizeof(int64_t)); 695 *buflen = sizeof(int64_t); 696 return (0); 697 } 698 699 static int 700 ng_int64_getAlign(const struct ng_parse_type *type) 701 { 702 return INT64_ALIGNMENT; 703 } 704 705 const struct ng_parse_type ng_parse_int64_type = { 706 NULL, 707 (void *)INT_SIGNED, 708 NULL, 709 ng_int64_parse, 710 ng_int64_unparse, 711 ng_int64_getDefault, 712 ng_int64_getAlign 713 }; 714 715 const struct ng_parse_type ng_parse_uint64_type = { 716 &ng_parse_int64_type, 717 (void *)INT_UNSIGNED 718 }; 719 720 const struct ng_parse_type ng_parse_hint64_type = { 721 &ng_parse_int64_type, 722 (void *)INT_HEX 723 }; 724 725 /************************************************************************ 726 STRING TYPE 727 ************************************************************************/ 728 729 static int 730 ng_string_parse(const struct ng_parse_type *type, 731 const char *s, int *off, const u_char *const start, 732 u_char *const buf, int *buflen) 733 { 734 char *sval; 735 int len; 736 int slen; 737 738 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 739 return (EINVAL); 740 *off += len; 741 bcopy(sval, buf, slen + 1); 742 kfree(sval, M_NETGRAPH_PARSE); 743 *buflen = slen + 1; 744 return (0); 745 } 746 747 static int 748 ng_string_unparse(const struct ng_parse_type *type, 749 const u_char *data, int *off, char *cbuf, int cbuflen) 750 { 751 const char *const raw = (const char *)data + *off; 752 char *const s = ng_encode_string(raw, strlen(raw)); 753 int error; 754 755 if (s == NULL) 756 return (ENOMEM); 757 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 758 kfree(s, M_NETGRAPH_PARSE); 759 return (error); 760 } 761 *off += strlen(raw) + 1; 762 kfree(s, M_NETGRAPH_PARSE); 763 return (0); 764 } 765 766 static int 767 ng_string_getDefault(const struct ng_parse_type *type, 768 const u_char *const start, u_char *buf, int *buflen) 769 { 770 771 if (*buflen < 1) 772 return (ERANGE); 773 buf[0] = (u_char)'\0'; 774 *buflen = 1; 775 return (0); 776 } 777 778 const struct ng_parse_type ng_parse_string_type = { 779 NULL, 780 NULL, 781 NULL, 782 ng_string_parse, 783 ng_string_unparse, 784 ng_string_getDefault, 785 NULL 786 }; 787 788 /************************************************************************ 789 FIXED BUFFER STRING TYPE 790 ************************************************************************/ 791 792 static int 793 ng_fixedstring_parse(const struct ng_parse_type *type, 794 const char *s, int *off, const u_char *const start, 795 u_char *const buf, int *buflen) 796 { 797 const struct ng_parse_fixedstring_info *const fi = type->info; 798 char *sval; 799 int len; 800 int slen; 801 802 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 803 return (EINVAL); 804 if (slen + 1 > fi->bufSize) { 805 kfree(sval, M_NETGRAPH_PARSE); 806 return (E2BIG); 807 } 808 *off += len; 809 bcopy(sval, buf, slen); 810 kfree(sval, M_NETGRAPH_PARSE); 811 bzero(buf + slen, fi->bufSize - slen); 812 *buflen = fi->bufSize; 813 return (0); 814 } 815 816 static int 817 ng_fixedstring_unparse(const struct ng_parse_type *type, 818 const u_char *data, int *off, char *cbuf, int cbuflen) 819 { 820 const struct ng_parse_fixedstring_info *const fi = type->info; 821 int error, temp = *off; 822 823 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 824 return (error); 825 *off += fi->bufSize; 826 return (0); 827 } 828 829 static int 830 ng_fixedstring_getDefault(const struct ng_parse_type *type, 831 const u_char *const start, u_char *buf, int *buflen) 832 { 833 const struct ng_parse_fixedstring_info *const fi = type->info; 834 835 if (*buflen < fi->bufSize) 836 return (ERANGE); 837 bzero(buf, fi->bufSize); 838 *buflen = fi->bufSize; 839 return (0); 840 } 841 842 const struct ng_parse_type ng_parse_fixedstring_type = { 843 NULL, 844 NULL, 845 NULL, 846 ng_fixedstring_parse, 847 ng_fixedstring_unparse, 848 ng_fixedstring_getDefault, 849 NULL 850 }; 851 852 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 853 NG_NODESIZ 854 }; 855 const struct ng_parse_type ng_parse_nodebuf_type = { 856 &ng_parse_fixedstring_type, 857 &ng_parse_nodebuf_info 858 }; 859 860 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 861 NG_HOOKSIZ 862 }; 863 const struct ng_parse_type ng_parse_hookbuf_type = { 864 &ng_parse_fixedstring_type, 865 &ng_parse_hookbuf_info 866 }; 867 868 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 869 NG_PATHSIZ 870 }; 871 const struct ng_parse_type ng_parse_pathbuf_type = { 872 &ng_parse_fixedstring_type, 873 &ng_parse_pathbuf_info 874 }; 875 876 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 877 NG_TYPESIZ 878 }; 879 const struct ng_parse_type ng_parse_typebuf_type = { 880 &ng_parse_fixedstring_type, 881 &ng_parse_typebuf_info 882 }; 883 884 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 885 NG_CMDSTRSIZ 886 }; 887 const struct ng_parse_type ng_parse_cmdbuf_type = { 888 &ng_parse_fixedstring_type, 889 &ng_parse_cmdbuf_info 890 }; 891 892 /************************************************************************ 893 EXPLICITLY SIZED STRING TYPE 894 ************************************************************************/ 895 896 static int 897 ng_sizedstring_parse(const struct ng_parse_type *type, 898 const char *s, int *off, const u_char *const start, 899 u_char *const buf, int *buflen) 900 { 901 char *sval; 902 int len; 903 int slen; 904 905 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL) 906 return (EINVAL); 907 if (slen > USHRT_MAX) { 908 kfree(sval, M_NETGRAPH_PARSE); 909 return (EINVAL); 910 } 911 *off += len; 912 *((u_int16_t *)buf) = (u_int16_t)slen; 913 bcopy(sval, buf + 2, slen); 914 kfree(sval, M_NETGRAPH_PARSE); 915 *buflen = 2 + slen; 916 return (0); 917 } 918 919 static int 920 ng_sizedstring_unparse(const struct ng_parse_type *type, 921 const u_char *data, int *off, char *cbuf, int cbuflen) 922 { 923 const char *const raw = (const char *)data + *off + 2; 924 const int slen = *((const u_int16_t *)(data + *off)); 925 char *const s = ng_encode_string(raw, slen); 926 int error; 927 928 if (s == NULL) 929 return (ENOMEM); 930 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) { 931 kfree(s, M_NETGRAPH_PARSE); 932 return (error); 933 } 934 kfree(s, M_NETGRAPH_PARSE); 935 *off += slen + 2; 936 return (0); 937 } 938 939 static int 940 ng_sizedstring_getDefault(const struct ng_parse_type *type, 941 const u_char *const start, u_char *buf, int *buflen) 942 { 943 if (*buflen < 2) 944 return (ERANGE); 945 bzero(buf, 2); 946 *buflen = 2; 947 return (0); 948 } 949 950 const struct ng_parse_type ng_parse_sizedstring_type = { 951 NULL, 952 NULL, 953 NULL, 954 ng_sizedstring_parse, 955 ng_sizedstring_unparse, 956 ng_sizedstring_getDefault, 957 NULL 958 }; 959 960 /************************************************************************ 961 IP ADDRESS TYPE 962 ************************************************************************/ 963 964 static int 965 ng_ipaddr_parse(const struct ng_parse_type *type, 966 const char *s, int *off, const u_char *const start, 967 u_char *const buf, int *buflen) 968 { 969 int i, error; 970 971 for (i = 0; i < 4; i++) { 972 if ((error = ng_int8_parse(&ng_parse_int8_type, 973 s, off, start, buf + i, buflen)) != 0) 974 return (error); 975 if (i < 3 && s[*off] != '.') 976 return (EINVAL); 977 (*off)++; 978 } 979 *buflen = 4; 980 return (0); 981 } 982 983 static int 984 ng_ipaddr_unparse(const struct ng_parse_type *type, 985 const u_char *data, int *off, char *cbuf, int cbuflen) 986 { 987 struct in_addr ip; 988 int error; 989 990 bcopy(data + *off, &ip, sizeof(ip)); 991 if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d", 992 ((u_char *)&ip)[0], ((u_char *)&ip)[1], 993 ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0) 994 return (error); 995 *off += sizeof(ip); 996 return (0); 997 } 998 999 static int 1000 ng_ipaddr_getDefault(const struct ng_parse_type *type, 1001 const u_char *const start, u_char *buf, int *buflen) 1002 { 1003 struct in_addr ip = { 0 }; 1004 1005 if (*buflen < sizeof(ip)) 1006 return (ERANGE); 1007 bcopy(&ip, buf, sizeof(ip)); 1008 *buflen = sizeof(ip); 1009 return (0); 1010 } 1011 1012 const struct ng_parse_type ng_parse_ipaddr_type = { 1013 NULL, 1014 NULL, 1015 NULL, 1016 ng_ipaddr_parse, 1017 ng_ipaddr_unparse, 1018 ng_ipaddr_getDefault, 1019 ng_int32_getAlign 1020 }; 1021 1022 /************************************************************************ 1023 ETHERNET ADDRESS TYPE 1024 ************************************************************************/ 1025 1026 static int 1027 ng_enaddr_parse(const struct ng_parse_type *type, 1028 const char *s, int *const off, const u_char *const start, 1029 u_char *const buf, int *const buflen) 1030 { 1031 char *eptr; 1032 u_long val; 1033 int i; 1034 1035 if (*buflen < ETHER_ADDR_LEN) 1036 return (ERANGE); 1037 for (i = 0; i < ETHER_ADDR_LEN; i++) { 1038 val = strtoul(s + *off, &eptr, 16); 1039 if (val > 0xff || eptr == s + *off) 1040 return (EINVAL); 1041 buf[i] = (u_char)val; 1042 *off = (eptr - s); 1043 if (i < ETHER_ADDR_LEN - 1) { 1044 if (*eptr != ':') 1045 return (EINVAL); 1046 (*off)++; 1047 } 1048 } 1049 *buflen = ETHER_ADDR_LEN; 1050 return (0); 1051 } 1052 1053 static int 1054 ng_enaddr_unparse(const struct ng_parse_type *type, 1055 const u_char *data, int *off, char *cbuf, int cbuflen) 1056 { 1057 int len; 1058 1059 len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x", 1060 data[*off], data[*off + 1], data[*off + 2], 1061 data[*off + 3], data[*off + 4], data[*off + 5]); 1062 if (len >= cbuflen) 1063 return (ERANGE); 1064 *off += ETHER_ADDR_LEN; 1065 return (0); 1066 } 1067 1068 const struct ng_parse_type ng_parse_enaddr_type = { 1069 NULL, 1070 NULL, 1071 NULL, 1072 ng_enaddr_parse, 1073 ng_enaddr_unparse, 1074 NULL, 1075 0 1076 }; 1077 1078 /************************************************************************ 1079 BYTE ARRAY TYPE 1080 ************************************************************************/ 1081 1082 /* Get the length of a byte array */ 1083 static int 1084 ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type, 1085 const u_char *start, const u_char *buf) 1086 { 1087 ng_parse_array_getLength_t *const getLength = type->private; 1088 1089 return (*getLength)(type, start, buf); 1090 } 1091 1092 /* Byte array element type is hex int8 */ 1093 static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = { 1094 &ng_parse_hint8_type, 1095 &ng_parse_bytearray_subtype_getLength, 1096 NULL 1097 }; 1098 static const struct ng_parse_type ng_parse_bytearray_subtype = { 1099 &ng_parse_array_type, 1100 &ng_parse_bytearray_subtype_info 1101 }; 1102 1103 static int 1104 ng_bytearray_parse(const struct ng_parse_type *type, 1105 const char *s, int *off, const u_char *const start, 1106 u_char *const buf, int *buflen) 1107 { 1108 char *str; 1109 int toklen; 1110 int slen; 1111 1112 /* We accept either an array of bytes or a string constant */ 1113 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) { 1114 ng_parse_array_getLength_t *const getLength = type->info; 1115 int arraylen; 1116 1117 arraylen = (*getLength)(type, start, buf); 1118 if (arraylen > *buflen) { 1119 kfree(str, M_NETGRAPH_PARSE); 1120 return (ERANGE); 1121 } 1122 if (slen > arraylen) { 1123 kfree(str, M_NETGRAPH_PARSE); 1124 return (E2BIG); 1125 } 1126 bcopy(str, buf, slen); 1127 bzero(buf + slen, arraylen - slen); 1128 kfree(str, M_NETGRAPH_PARSE); 1129 *off += toklen; 1130 *buflen = arraylen; 1131 return (0); 1132 } else { 1133 struct ng_parse_type subtype; 1134 1135 subtype = ng_parse_bytearray_subtype; 1136 *(const void **)(void *)&subtype.private = type->info; 1137 return ng_array_parse(&subtype, s, off, start, buf, buflen); 1138 } 1139 } 1140 1141 static int 1142 ng_bytearray_unparse(const struct ng_parse_type *type, 1143 const u_char *data, int *off, char *cbuf, int cbuflen) 1144 { 1145 struct ng_parse_type subtype; 1146 1147 subtype = ng_parse_bytearray_subtype; 1148 *(const void **)(void *)&subtype.private = type->info; 1149 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen); 1150 } 1151 1152 static int 1153 ng_bytearray_getDefault(const struct ng_parse_type *type, 1154 const u_char *const start, u_char *buf, int *buflen) 1155 { 1156 struct ng_parse_type subtype; 1157 1158 subtype = ng_parse_bytearray_subtype; 1159 *(const void **)(void *)&subtype.private = type->info; 1160 return ng_array_getDefault(&subtype, start, buf, buflen); 1161 } 1162 1163 const struct ng_parse_type ng_parse_bytearray_type = { 1164 NULL, 1165 NULL, 1166 NULL, 1167 ng_bytearray_parse, 1168 ng_bytearray_unparse, 1169 ng_bytearray_getDefault, 1170 NULL 1171 }; 1172 1173 /************************************************************************ 1174 STRUCT NG_MESG TYPE 1175 ************************************************************************/ 1176 1177 /* Get msg->header.arglen when "buf" is pointing to msg->data */ 1178 static int 1179 ng_parse_ng_mesg_getLength(const struct ng_parse_type *type, 1180 const u_char *start, const u_char *buf) 1181 { 1182 const struct ng_mesg *msg; 1183 1184 msg = (const struct ng_mesg *)(buf - sizeof(*msg)); 1185 return msg->header.arglen; 1186 } 1187 1188 /* Type for the variable length data portion of a struct ng_mesg */ 1189 static const struct ng_parse_type ng_msg_data_type = { 1190 &ng_parse_bytearray_type, 1191 &ng_parse_ng_mesg_getLength 1192 }; 1193 1194 /* Type for the entire struct ng_mesg header with data section */ 1195 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1196 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1197 const struct ng_parse_type ng_parse_ng_mesg_type = { 1198 &ng_parse_struct_type, 1199 &ng_parse_ng_mesg_type_fields, 1200 }; 1201 1202 /************************************************************************ 1203 COMPOSITE HELPER ROUTINES 1204 ************************************************************************/ 1205 1206 /* 1207 * Convert a structure or array from ASCII to binary 1208 */ 1209 static int 1210 ng_parse_composite(const struct ng_parse_type *type, const char *s, 1211 int *off, const u_char *const start, u_char *const buf, int *buflen, 1212 const enum comptype ctype) 1213 { 1214 const int num = ng_get_composite_len(type, start, buf, ctype); 1215 int nextIndex = 0; /* next implicit array index */ 1216 u_int index; /* field or element index */ 1217 int *foff; /* field value offsets in string */ 1218 int align, len, blen, error = 0; 1219 1220 /* Initialize */ 1221 foff = kmalloc(num * sizeof(*foff), M_NETGRAPH_PARSE, 1222 M_WAITOK | M_NULLOK | M_ZERO); 1223 if (foff == NULL) { 1224 error = ENOMEM; 1225 goto done; 1226 } 1227 1228 /* Get opening brace/bracket */ 1229 if (ng_parse_get_token(s, off, &len) 1230 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) { 1231 error = EINVAL; 1232 goto done; 1233 } 1234 *off += len; 1235 1236 /* Get individual element value positions in the string */ 1237 for (;;) { 1238 enum ng_parse_token tok; 1239 1240 /* Check for closing brace/bracket */ 1241 tok = ng_parse_get_token(s, off, &len); 1242 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) { 1243 *off += len; 1244 break; 1245 } 1246 1247 /* For arrays, the 'name' (ie, index) is optional, so 1248 distinguish name from values by seeing if the next 1249 token is an equals sign */ 1250 if (ctype != CT_STRUCT) { 1251 int len2, off2; 1252 char *eptr; 1253 1254 /* If an opening brace/bracket, index is implied */ 1255 if (tok == T_LBRACE || tok == T_LBRACKET) { 1256 index = nextIndex++; 1257 goto gotIndex; 1258 } 1259 1260 /* Might be an index, might be a value, either way... */ 1261 if (tok != T_WORD) { 1262 error = EINVAL; 1263 goto done; 1264 } 1265 1266 /* If no equals sign follows, index is implied */ 1267 off2 = *off + len; 1268 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) { 1269 index = nextIndex++; 1270 goto gotIndex; 1271 } 1272 1273 /* Index was specified explicitly; parse it */ 1274 index = (u_int)strtoul(s + *off, &eptr, 0); 1275 if (index < 0 || eptr - (s + *off) != len) { 1276 error = EINVAL; 1277 goto done; 1278 } 1279 nextIndex = index + 1; 1280 *off += len + len2; 1281 } else { /* a structure field */ 1282 const struct ng_parse_struct_field *const 1283 fields = type->info; 1284 1285 /* Find the field by name (required) in field list */ 1286 if (tok != T_WORD) { 1287 error = EINVAL; 1288 goto done; 1289 } 1290 for (index = 0; index < num; index++) { 1291 const struct ng_parse_struct_field *const 1292 field = &fields[index]; 1293 1294 if (strncmp(&s[*off], field->name, len) == 0 1295 && field->name[len] == '\0') 1296 break; 1297 } 1298 if (index == num) { 1299 error = ENOENT; 1300 goto done; 1301 } 1302 *off += len; 1303 1304 /* Get equals sign */ 1305 if (ng_parse_get_token(s, off, &len) != T_EQUALS) { 1306 error = EINVAL; 1307 goto done; 1308 } 1309 *off += len; 1310 } 1311 gotIndex: 1312 1313 /* Check array index */ 1314 if (index >= num) { 1315 error = E2BIG; 1316 goto done; 1317 } 1318 1319 /* Save value's position and skip over it for now */ 1320 if (foff[index] != 0) { 1321 error = EALREADY; /* duplicate */ 1322 goto done; 1323 } 1324 while (isspace(s[*off])) 1325 (*off)++; 1326 foff[index] = *off; 1327 if ((error = ng_parse_skip_value(s, *off, &len)) != 0) 1328 goto done; 1329 *off += len; 1330 } 1331 1332 /* Now build binary structure from supplied values and defaults */ 1333 for (blen = index = 0; index < num; index++) { 1334 const struct ng_parse_type *const 1335 etype = ng_get_composite_etype(type, index, ctype); 1336 int k, pad, vlen; 1337 1338 /* Zero-pad any alignment bytes */ 1339 pad = ng_parse_get_elem_pad(type, index, ctype, blen); 1340 for (k = 0; k < pad; k++) { 1341 if (blen >= *buflen) { 1342 error = ERANGE; 1343 goto done; 1344 } 1345 buf[blen++] = 0; 1346 } 1347 1348 /* Get value */ 1349 vlen = *buflen - blen; 1350 if (foff[index] == 0) { /* use default value */ 1351 error = ng_get_composite_elem_default(type, index, 1352 start, buf + blen, &vlen, ctype); 1353 } else { /* parse given value */ 1354 *off = foff[index]; 1355 error = INVOKE(etype, parse)(etype, 1356 s, off, start, buf + blen, &vlen); 1357 } 1358 if (error != 0) 1359 goto done; 1360 blen += vlen; 1361 } 1362 1363 /* Make total composite structure size a multiple of its alignment */ 1364 if ((align = ALIGNMENT(type)) != 0) { 1365 while (blen % align != 0) { 1366 if (blen >= *buflen) { 1367 error = ERANGE; 1368 goto done; 1369 } 1370 buf[blen++] = 0; 1371 } 1372 } 1373 1374 /* Done */ 1375 *buflen = blen; 1376 done: 1377 if (foff != NULL) 1378 kfree(foff, M_NETGRAPH_PARSE); 1379 return (error); 1380 } 1381 1382 /* 1383 * Convert an array or structure from binary to ASCII 1384 */ 1385 static int 1386 ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, 1387 int *off, char *cbuf, int cbuflen, const enum comptype ctype) 1388 { 1389 const struct ng_mesg *const hdr 1390 = (const struct ng_mesg *)(data - sizeof(*hdr)); 1391 const int num = ng_get_composite_len(type, data, data + *off, ctype); 1392 const int workSize = 20 * 1024; /* XXX hard coded constant */ 1393 int nextIndex = 0, didOne = 0; 1394 int error, index; 1395 u_char *workBuf; 1396 1397 /* Get workspace for checking default values */ 1398 workBuf = kmalloc(workSize, M_NETGRAPH_PARSE, M_WAITOK | M_NULLOK); 1399 if (workBuf == NULL) 1400 return (ENOMEM); 1401 1402 /* Opening brace/bracket */ 1403 if ((error = ng_parse_append(&cbuf, &cbuflen, "%c", 1404 (ctype == CT_STRUCT) ? '{' : '[')) != 0) 1405 goto fail; 1406 1407 /* Do each item */ 1408 for (index = 0; index < num; index++) { 1409 const struct ng_parse_type *const 1410 etype = ng_get_composite_etype(type, index, ctype); 1411 1412 /* Skip any alignment pad bytes */ 1413 *off += ng_parse_get_elem_pad(type, index, ctype, *off); 1414 1415 /* 1416 * See if element is equal to its default value; skip if so. 1417 * Copy struct ng_mesg header for types that peek into it. 1418 */ 1419 if (sizeof(*hdr) + *off < workSize) { 1420 int tempsize = workSize - sizeof(*hdr) - *off; 1421 1422 bcopy(hdr, workBuf, sizeof(*hdr) + *off); 1423 if (ng_get_composite_elem_default(type, index, workBuf 1424 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off, 1425 &tempsize, ctype) == 0 1426 && bcmp(workBuf + sizeof(*hdr) + *off, 1427 data + *off, tempsize) == 0) { 1428 *off += tempsize; 1429 continue; 1430 } 1431 } 1432 1433 /* Print name= */ 1434 if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0) 1435 goto fail; 1436 if (ctype != CT_STRUCT) { 1437 if (index != nextIndex) { 1438 nextIndex = index; 1439 if ((error = ng_parse_append(&cbuf, 1440 &cbuflen, "%d=", index)) != 0) 1441 goto fail; 1442 } 1443 nextIndex++; 1444 } else { 1445 const struct ng_parse_struct_field *const 1446 fields = type->info; 1447 1448 if ((error = ng_parse_append(&cbuf, 1449 &cbuflen, "%s=", fields[index].name)) != 0) 1450 goto fail; 1451 } 1452 1453 /* Print value */ 1454 if ((error = INVOKE(etype, unparse) 1455 (etype, data, off, cbuf, cbuflen)) != 0) { 1456 kfree(workBuf, M_NETGRAPH_PARSE); 1457 return (error); 1458 } 1459 cbuflen -= strlen(cbuf); 1460 cbuf += strlen(cbuf); 1461 didOne = 1; 1462 } 1463 1464 /* Closing brace/bracket */ 1465 error = ng_parse_append(&cbuf, &cbuflen, "%s%c", 1466 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']'); 1467 1468 fail: 1469 /* Clean up after failure */ 1470 kfree(workBuf, M_NETGRAPH_PARSE); 1471 return (error); 1472 } 1473 1474 /* 1475 * Generate the default value for an element of an array or structure 1476 * Returns EOPNOTSUPP if default value is unspecified. 1477 */ 1478 static int 1479 ng_get_composite_elem_default(const struct ng_parse_type *type, 1480 int index, const u_char *const start, u_char *buf, int *buflen, 1481 const enum comptype ctype) 1482 { 1483 const struct ng_parse_type *etype; 1484 ng_getDefault_t *func; 1485 1486 switch (ctype) { 1487 case CT_STRUCT: 1488 break; 1489 case CT_ARRAY: 1490 { 1491 const struct ng_parse_array_info *const ai = type->info; 1492 1493 if (ai->getDefault != NULL) { 1494 return (*ai->getDefault)(type, 1495 index, start, buf, buflen); 1496 } 1497 break; 1498 } 1499 case CT_FIXEDARRAY: 1500 { 1501 const struct ng_parse_fixedarray_info *const fi = type->info; 1502 1503 if (*fi->getDefault != NULL) { 1504 return (*fi->getDefault)(type, 1505 index, start, buf, buflen); 1506 } 1507 break; 1508 } 1509 default: 1510 panic("%s", __func__); 1511 } 1512 1513 /* Default to element type default */ 1514 etype = ng_get_composite_etype(type, index, ctype); 1515 func = METHOD(etype, getDefault); 1516 if (func == NULL) 1517 return (EOPNOTSUPP); 1518 return (*func)(etype, start, buf, buflen); 1519 } 1520 1521 /* 1522 * Get the number of elements in a struct, variable or fixed array. 1523 */ 1524 static int 1525 ng_get_composite_len(const struct ng_parse_type *type, 1526 const u_char *const start, const u_char *buf, 1527 const enum comptype ctype) 1528 { 1529 switch (ctype) { 1530 case CT_STRUCT: 1531 { 1532 const struct ng_parse_struct_field *const fields = type->info; 1533 int numFields = 0; 1534 1535 for (numFields = 0; ; numFields++) { 1536 const struct ng_parse_struct_field *const 1537 fi = &fields[numFields]; 1538 1539 if (fi->name == NULL) 1540 break; 1541 } 1542 return (numFields); 1543 } 1544 case CT_ARRAY: 1545 { 1546 const struct ng_parse_array_info *const ai = type->info; 1547 1548 return (*ai->getLength)(type, start, buf); 1549 } 1550 case CT_FIXEDARRAY: 1551 { 1552 const struct ng_parse_fixedarray_info *const fi = type->info; 1553 1554 return fi->length; 1555 } 1556 default: 1557 panic("%s", __func__); 1558 } 1559 return (0); 1560 } 1561 1562 /* 1563 * Return the type of the index'th element of a composite structure 1564 */ 1565 static const struct ng_parse_type * 1566 ng_get_composite_etype(const struct ng_parse_type *type, 1567 int index, const enum comptype ctype) 1568 { 1569 const struct ng_parse_type *etype = NULL; 1570 1571 switch (ctype) { 1572 case CT_STRUCT: 1573 { 1574 const struct ng_parse_struct_field *const fields = type->info; 1575 1576 etype = fields[index].type; 1577 break; 1578 } 1579 case CT_ARRAY: 1580 { 1581 const struct ng_parse_array_info *const ai = type->info; 1582 1583 etype = ai->elementType; 1584 break; 1585 } 1586 case CT_FIXEDARRAY: 1587 { 1588 const struct ng_parse_fixedarray_info *const fi = type->info; 1589 1590 etype = fi->elementType; 1591 break; 1592 } 1593 default: 1594 panic("%s", __func__); 1595 } 1596 return (etype); 1597 } 1598 1599 /* 1600 * Get the number of bytes to skip to align for the next 1601 * element in a composite structure. 1602 */ 1603 static int 1604 ng_parse_get_elem_pad(const struct ng_parse_type *type, 1605 int index, enum comptype ctype, int posn) 1606 { 1607 const struct ng_parse_type *const 1608 etype = ng_get_composite_etype(type, index, ctype); 1609 int align; 1610 1611 /* Get element's alignment, and possibly override */ 1612 align = ALIGNMENT(etype); 1613 if (ctype == CT_STRUCT) { 1614 const struct ng_parse_struct_field *const fields = type->info; 1615 1616 if (fields[index].alignment != 0) 1617 align = fields[index].alignment; 1618 } 1619 1620 /* Return number of bytes to skip to align */ 1621 return (align ? (align - (posn % align)) % align : 0); 1622 } 1623 1624 /************************************************************************ 1625 PARSING HELPER ROUTINES 1626 ************************************************************************/ 1627 1628 /* 1629 * Append to a fixed length string buffer. 1630 */ 1631 static int 1632 ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...) 1633 { 1634 va_list args; 1635 int len; 1636 1637 va_start(args, fmt); 1638 len = kvsnprintf(*cbufp, *cbuflenp, fmt, args); 1639 va_end(args); 1640 if (len >= *cbuflenp) 1641 return ERANGE; 1642 *cbufp += len; 1643 *cbuflenp -= len; 1644 1645 return (0); 1646 } 1647 1648 /* 1649 * Skip over a value 1650 */ 1651 static int 1652 ng_parse_skip_value(const char *s, int off0, int *lenp) 1653 { 1654 int len, nbracket, nbrace; 1655 int off = off0; 1656 1657 len = nbracket = nbrace = 0; 1658 do { 1659 switch (ng_parse_get_token(s, &off, &len)) { 1660 case T_LBRACKET: 1661 nbracket++; 1662 break; 1663 case T_LBRACE: 1664 nbrace++; 1665 break; 1666 case T_RBRACKET: 1667 if (nbracket-- == 0) 1668 return (EINVAL); 1669 break; 1670 case T_RBRACE: 1671 if (nbrace-- == 0) 1672 return (EINVAL); 1673 break; 1674 case T_EOF: 1675 return (EINVAL); 1676 default: 1677 break; 1678 } 1679 off += len; 1680 } while (nbracket > 0 || nbrace > 0); 1681 *lenp = off - off0; 1682 return (0); 1683 } 1684 1685 /* 1686 * Find the next token in the string, starting at offset *startp. 1687 * Returns the token type, with *startp pointing to the first char 1688 * and *lenp the length. 1689 */ 1690 enum ng_parse_token 1691 ng_parse_get_token(const char *s, int *startp, int *lenp) 1692 { 1693 char *t; 1694 int i; 1695 1696 while (isspace(s[*startp])) 1697 (*startp)++; 1698 switch (s[*startp]) { 1699 case '\0': 1700 *lenp = 0; 1701 return T_EOF; 1702 case '{': 1703 *lenp = 1; 1704 return T_LBRACE; 1705 case '}': 1706 *lenp = 1; 1707 return T_RBRACE; 1708 case '[': 1709 *lenp = 1; 1710 return T_LBRACKET; 1711 case ']': 1712 *lenp = 1; 1713 return T_RBRACKET; 1714 case '=': 1715 *lenp = 1; 1716 return T_EQUALS; 1717 case '"': 1718 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL) 1719 return T_ERROR; 1720 kfree(t, M_NETGRAPH_PARSE); 1721 return T_STRING; 1722 default: 1723 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i]) 1724 && s[i] != '{' && s[i] != '}' && s[i] != '[' 1725 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++) 1726 ; 1727 *lenp = i - *startp; 1728 return T_WORD; 1729 } 1730 } 1731 1732 /* 1733 * Get a string token, which must be enclosed in double quotes. 1734 * The normal C backslash escapes are recognized. 1735 */ 1736 char * 1737 ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp) 1738 { 1739 char *cbuf, *p; 1740 int start, off; 1741 int slen; 1742 1743 while (isspace(s[*startp])) 1744 (*startp)++; 1745 start = *startp; 1746 if (s[*startp] != '"') 1747 return (NULL); 1748 cbuf = kmalloc(strlen(s + start), M_NETGRAPH_PARSE, 1749 M_WAITOK | M_NULLOK); 1750 if (cbuf == NULL) 1751 return (NULL); 1752 strcpy(cbuf, s + start + 1); 1753 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) { 1754 if (*p == '"') { 1755 *p = '\0'; 1756 *lenp = off + 1; 1757 if (slenp != NULL) 1758 *slenp = slen; 1759 return (cbuf); 1760 } else if (p[0] == '\\' && p[1] != '\0') { 1761 int x, k; 1762 char *v; 1763 1764 strcpy(p, p + 1); 1765 v = p; 1766 switch (*p) { 1767 case 't': 1768 *v = '\t'; 1769 off++; 1770 continue; 1771 case 'n': 1772 *v = '\n'; 1773 off++; 1774 continue; 1775 case 'r': 1776 *v = '\r'; 1777 off++; 1778 continue; 1779 case 'v': 1780 *v = '\v'; 1781 off++; 1782 continue; 1783 case 'f': 1784 *v = '\f'; 1785 off++; 1786 continue; 1787 case '"': 1788 *v = '"'; 1789 off++; 1790 continue; 1791 case '0': case '1': case '2': case '3': 1792 case '4': case '5': case '6': case '7': 1793 for (x = k = 0; 1794 k < 3 && *v >= '0' && *v <= '7'; v++) { 1795 x = (x << 3) + (*v - '0'); 1796 off++; 1797 } 1798 *--v = (char)x; 1799 break; 1800 case 'x': 1801 for (v++, x = k = 0; 1802 k < 2 && isxdigit(*v); v++) { 1803 x = (x << 4) + (isdigit(*v) ? 1804 (*v - '0') : 1805 (tolower(*v) - 'a' + 10)); 1806 off++; 1807 } 1808 *--v = (char)x; 1809 break; 1810 default: 1811 continue; 1812 } 1813 strcpy(p, v); 1814 } 1815 } 1816 kfree(cbuf, M_NETGRAPH_PARSE); 1817 return (NULL); /* no closing quote */ 1818 } 1819 1820 /* 1821 * Encode a string so it can be safely put in double quotes. 1822 * Caller must free the result. Exactly "slen" characters 1823 * are encoded. 1824 */ 1825 char * 1826 ng_encode_string(const char *raw, int slen) 1827 { 1828 char *cbuf; 1829 int off = 0; 1830 int i; 1831 1832 cbuf = kmalloc(strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, 1833 M_WAITOK | M_NULLOK); 1834 if (cbuf == NULL) 1835 return (NULL); 1836 cbuf[off++] = '"'; 1837 for (i = 0; i < slen; i++, raw++) { 1838 switch (*raw) { 1839 case '\t': 1840 cbuf[off++] = '\\'; 1841 cbuf[off++] = 't'; 1842 break; 1843 case '\f': 1844 cbuf[off++] = '\\'; 1845 cbuf[off++] = 'f'; 1846 break; 1847 case '\n': 1848 cbuf[off++] = '\\'; 1849 cbuf[off++] = 'n'; 1850 break; 1851 case '\r': 1852 cbuf[off++] = '\\'; 1853 cbuf[off++] = 'r'; 1854 break; 1855 case '\v': 1856 cbuf[off++] = '\\'; 1857 cbuf[off++] = 'v'; 1858 break; 1859 case '"': 1860 case '\\': 1861 cbuf[off++] = '\\'; 1862 cbuf[off++] = *raw; 1863 break; 1864 default: 1865 if (*raw < 0x20 || *raw > 0x7e) { 1866 off += ksprintf(cbuf + off, 1867 "\\x%02x", (u_char)*raw); 1868 break; 1869 } 1870 cbuf[off++] = *raw; 1871 break; 1872 } 1873 } 1874 cbuf[off++] = '"'; 1875 cbuf[off] = '\0'; 1876 return (cbuf); 1877 } 1878 1879 /************************************************************************ 1880 VIRTUAL METHOD LOOKUP 1881 ************************************************************************/ 1882 1883 static ng_parse_t * 1884 ng_get_parse_method(const struct ng_parse_type *t) 1885 { 1886 while (t != NULL && t->parse == NULL) 1887 t = t->supertype; 1888 return (t ? t->parse : NULL); 1889 } 1890 1891 static ng_unparse_t * 1892 ng_get_unparse_method(const struct ng_parse_type *t) 1893 { 1894 while (t != NULL && t->unparse == NULL) 1895 t = t->supertype; 1896 return (t ? t->unparse : NULL); 1897 } 1898 1899 static ng_getDefault_t * 1900 ng_get_getDefault_method(const struct ng_parse_type *t) 1901 { 1902 while (t != NULL && t->getDefault == NULL) 1903 t = t->supertype; 1904 return (t ? t->getDefault : NULL); 1905 } 1906 1907 static ng_getAlign_t * 1908 ng_get_getAlign_method(const struct ng_parse_type *t) 1909 { 1910 while (t != NULL && t->getAlign == NULL) 1911 t = t->supertype; 1912 return (t ? t->getAlign : NULL); 1913 } 1914 1915