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