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