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: src/sys/netgraph/ng_parse.c,v 1.3.2.8 2002/07/02 23:44:02 archie Exp $ 41 * $DragonFly: src/sys/netgraph/netgraph/ng_parse.c,v 1.5 2003/11/15 21:05:43 dillon Exp $ 42 */ 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/systm.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 /* Compute alignment for primitive integral types */ 58 struct int16_temp { 59 char x; 60 int16_t y; 61 }; 62 63 struct int32_temp { 64 char x; 65 int32_t y; 66 }; 67 68 struct int64_temp { 69 char x; 70 int64_t y; 71 }; 72 73 #define INT8_ALIGNMENT 1 74 #define INT16_ALIGNMENT ((int)&((struct int16_temp *)0)->y) 75 #define INT32_ALIGNMENT ((int)&((struct int32_temp *)0)->y) 76 #define INT64_ALIGNMENT ((int)&((struct int64_temp *)0)->y) 77 78 /* Output format for integral types */ 79 #define INT_UNSIGNED 0 80 #define INT_SIGNED 1 81 #define INT_HEX 2 82 83 /* Type of composite object: struct, array, or fixedarray */ 84 enum comptype { 85 CT_STRUCT, 86 CT_ARRAY, 87 CT_FIXEDARRAY, 88 }; 89 90 /* Composite types helper functions */ 91 static int ng_parse_composite(const struct ng_parse_type *type, 92 const char *s, int *off, const u_char *start, 93 u_char *const buf, int *buflen, enum comptype ctype); 94 static int ng_unparse_composite(const struct ng_parse_type *type, 95 const u_char *data, int *off, char *cbuf, int cbuflen, 96 enum comptype ctype); 97 static int ng_get_composite_elem_default(const struct ng_parse_type *type, 98 int index, const u_char *start, u_char *buf, 99 int *buflen, enum comptype ctype); 100 static int ng_get_composite_len(const struct ng_parse_type *type, 101 const u_char *start, const u_char *buf, 102 enum comptype ctype); 103 static const struct ng_parse_type *ng_get_composite_etype(const struct 104 ng_parse_type *type, int index, enum comptype ctype); 105 static int ng_parse_get_elem_pad(const struct ng_parse_type *type, 106 int index, enum comptype ctype, int posn); 107 108 /* Parsing helper functions */ 109 static int ng_parse_skip_value(const char *s, int off, int *lenp); 110 111 /* Poor man's virtual method calls */ 112 #define METHOD(t,m) (ng_get_ ## m ## _method(t)) 113 #define INVOKE(t,m) (*METHOD(t,m)) 114 115 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t); 116 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t); 117 static ng_getDefault_t *ng_get_getDefault_method(const 118 struct ng_parse_type *t); 119 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t); 120 121 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \ 122 0 : INVOKE(t, getAlign)(t)) 123 124 /* For converting binary to string */ 125 #define NG_PARSE_APPEND(fmt, args...) \ 126 do { \ 127 int len; \ 128 \ 129 len = snprintf((cbuf), (cbuflen), \ 130 fmt , ## args); \ 131 if (len >= (cbuflen)) \ 132 return (ERANGE); \ 133 (cbuf) += len; \ 134 (cbuflen) -= len; \ 135 } while (0) 136 137 /************************************************************************ 138 PUBLIC FUNCTIONS 139 ************************************************************************/ 140 141 /* 142 * Convert an ASCII string to binary according to the supplied type descriptor 143 */ 144 int 145 ng_parse(const struct ng_parse_type *type, 146 const char *string, int *off, u_char *buf, int *buflen) 147 { 148 return INVOKE(type, parse)(type, string, off, buf, buf, buflen); 149 } 150 151 /* 152 * Convert binary to an ASCII string according to the supplied type descriptor 153 */ 154 int 155 ng_unparse(const struct ng_parse_type *type, 156 const u_char *data, char *cbuf, int cbuflen) 157 { 158 int off = 0; 159 160 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen); 161 } 162 163 /* 164 * Fill in the default value according to the supplied type descriptor 165 */ 166 int 167 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen) 168 { 169 ng_getDefault_t *const func = METHOD(type, getDefault); 170 171 if (func == NULL) 172 return (EOPNOTSUPP); 173 return (*func)(type, buf, buf, buflen); 174 } 175 176 177 /************************************************************************ 178 STRUCTURE TYPE 179 ************************************************************************/ 180 181 static int 182 ng_struct_parse(const struct ng_parse_type *type, 183 const char *s, int *off, const u_char *const start, 184 u_char *const buf, int *buflen) 185 { 186 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT); 187 } 188 189 static int 190 ng_struct_unparse(const struct ng_parse_type *type, 191 const u_char *data, int *off, char *cbuf, int cbuflen) 192 { 193 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT); 194 } 195 196 static int 197 ng_struct_getDefault(const struct ng_parse_type *type, 198 const u_char *const start, u_char *buf, int *buflen) 199 { 200 int off = 0; 201 202 return ng_parse_composite(type, 203 "{}", &off, start, buf, buflen, CT_STRUCT); 204 } 205 206 static int 207 ng_struct_getAlign(const struct ng_parse_type *type) 208 { 209 const struct ng_parse_struct_field *field; 210 int align = 0; 211 212 for (field = type->info; 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 < (int8_t)0x80 || val > (u_int8_t)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 < (int16_t)0x8000 435 || val > (u_int16_t)0xffff || eptr == s + *off) 436 return (EINVAL); 437 *off = eptr - s; 438 val16 = (int16_t)val; 439 bcopy(&val16, buf, sizeof(int16_t)); 440 *buflen = sizeof(int16_t); 441 return (0); 442 } 443 444 static int 445 ng_int16_unparse(const struct ng_parse_type *type, 446 const u_char *data, int *off, char *cbuf, int cbuflen) 447 { 448 const char *fmt; 449 int fval; 450 int16_t val; 451 452 bcopy(data + *off, &val, sizeof(int16_t)); 453 switch ((int)type->info) { 454 case INT_SIGNED: 455 fmt = "%d"; 456 fval = val; 457 break; 458 case INT_UNSIGNED: 459 fmt = "%u"; 460 fval = (u_int16_t)val; 461 break; 462 case INT_HEX: 463 fmt = "0x%x"; 464 fval = (u_int16_t)val; 465 break; 466 default: 467 panic("%s: unknown type", __FUNCTION__); 468 } 469 NG_PARSE_APPEND(fmt, fval); 470 *off += sizeof(int16_t); 471 return (0); 472 } 473 474 static int 475 ng_int16_getDefault(const struct ng_parse_type *type, 476 const u_char *const start, u_char *buf, int *buflen) 477 { 478 int16_t val; 479 480 if (*buflen < sizeof(int16_t)) 481 return (ERANGE); 482 val = 0; 483 bcopy(&val, buf, sizeof(int16_t)); 484 *buflen = sizeof(int16_t); 485 return (0); 486 } 487 488 static int 489 ng_int16_getAlign(const struct ng_parse_type *type) 490 { 491 return INT16_ALIGNMENT; 492 } 493 494 const struct ng_parse_type ng_parse_int16_type = { 495 NULL, 496 (void *)INT_SIGNED, 497 NULL, 498 ng_int16_parse, 499 ng_int16_unparse, 500 ng_int16_getDefault, 501 ng_int16_getAlign 502 }; 503 504 const struct ng_parse_type ng_parse_uint16_type = { 505 &ng_parse_int16_type, 506 (void *)INT_UNSIGNED 507 }; 508 509 const struct ng_parse_type ng_parse_hint16_type = { 510 &ng_parse_int16_type, 511 (void *)INT_HEX 512 }; 513 514 /************************************************************************ 515 INT32 TYPE 516 ************************************************************************/ 517 518 static int 519 ng_int32_parse(const struct ng_parse_type *type, 520 const char *s, int *off, const u_char *const start, 521 u_char *const buf, int *buflen) 522 { 523 long val; /* assumes long is at least 32 bits */ 524 int32_t val32; 525 char *eptr; 526 527 val = strtol(s + *off, &eptr, 0); 528 if (val < (int32_t)0x80000000 529 || val > (u_int32_t)0xffffffff || eptr == s + *off) 530 return (EINVAL); 531 *off = eptr - s; 532 val32 = (int32_t)val; 533 bcopy(&val32, buf, sizeof(int32_t)); 534 *buflen = sizeof(int32_t); 535 return (0); 536 } 537 538 static int 539 ng_int32_unparse(const struct ng_parse_type *type, 540 const u_char *data, int *off, char *cbuf, int cbuflen) 541 { 542 const char *fmt; 543 long fval; 544 int32_t val; 545 546 bcopy(data + *off, &val, sizeof(int32_t)); 547 switch ((int)type->info) { 548 case INT_SIGNED: 549 fmt = "%ld"; 550 fval = val; 551 break; 552 case INT_UNSIGNED: 553 fmt = "%lu"; 554 fval = (u_int32_t)val; 555 break; 556 case INT_HEX: 557 fmt = "0x%lx"; 558 fval = (u_int32_t)val; 559 break; 560 default: 561 panic("%s: unknown type", __FUNCTION__); 562 } 563 NG_PARSE_APPEND(fmt, fval); 564 *off += sizeof(int32_t); 565 return (0); 566 } 567 568 static int 569 ng_int32_getDefault(const struct ng_parse_type *type, 570 const u_char *const start, u_char *buf, int *buflen) 571 { 572 int32_t val; 573 574 if (*buflen < sizeof(int32_t)) 575 return (ERANGE); 576 val = 0; 577 bcopy(&val, buf, sizeof(int32_t)); 578 *buflen = sizeof(int32_t); 579 return (0); 580 } 581 582 static int 583 ng_int32_getAlign(const struct ng_parse_type *type) 584 { 585 return INT32_ALIGNMENT; 586 } 587 588 const struct ng_parse_type ng_parse_int32_type = { 589 NULL, 590 (void *)INT_SIGNED, 591 NULL, 592 ng_int32_parse, 593 ng_int32_unparse, 594 ng_int32_getDefault, 595 ng_int32_getAlign 596 }; 597 598 const struct ng_parse_type ng_parse_uint32_type = { 599 &ng_parse_int32_type, 600 (void *)INT_UNSIGNED 601 }; 602 603 const struct ng_parse_type ng_parse_hint32_type = { 604 &ng_parse_int32_type, 605 (void *)INT_HEX 606 }; 607 608 /************************************************************************ 609 INT64 TYPE 610 ************************************************************************/ 611 612 static int 613 ng_int64_parse(const struct ng_parse_type *type, 614 const char *s, int *off, const u_char *const start, 615 u_char *const buf, int *buflen) 616 { 617 quad_t val; 618 int64_t val64; 619 char *eptr; 620 621 val = strtoq(s + *off, &eptr, 0); 622 if (eptr == s + *off) 623 return (EINVAL); 624 *off = eptr - s; 625 val64 = (int64_t)val; 626 bcopy(&val64, buf, sizeof(int64_t)); 627 *buflen = sizeof(int64_t); 628 return (0); 629 } 630 631 static int 632 ng_int64_unparse(const struct ng_parse_type *type, 633 const u_char *data, int *off, char *cbuf, int cbuflen) 634 { 635 const char *fmt; 636 long long fval; 637 int64_t val; 638 639 bcopy(data + *off, &val, sizeof(int64_t)); 640 switch ((int)type->info) { 641 case INT_SIGNED: 642 fmt = "%lld"; 643 fval = val; 644 break; 645 case INT_UNSIGNED: 646 fmt = "%llu"; 647 fval = (u_int64_t)val; 648 break; 649 case INT_HEX: 650 fmt = "0x%llx"; 651 fval = (u_int64_t)val; 652 break; 653 default: 654 panic("%s: unknown type", __FUNCTION__); 655 } 656 NG_PARSE_APPEND(fmt, fval); 657 *off += sizeof(int64_t); 658 return (0); 659 } 660 661 static int 662 ng_int64_getDefault(const struct ng_parse_type *type, 663 const u_char *const start, u_char *buf, int *buflen) 664 { 665 int64_t val; 666 667 if (*buflen < sizeof(int64_t)) 668 return (ERANGE); 669 val = 0; 670 bcopy(&val, buf, sizeof(int64_t)); 671 *buflen = sizeof(int64_t); 672 return (0); 673 } 674 675 static int 676 ng_int64_getAlign(const struct ng_parse_type *type) 677 { 678 return INT64_ALIGNMENT; 679 } 680 681 const struct ng_parse_type ng_parse_int64_type = { 682 NULL, 683 (void *)INT_SIGNED, 684 NULL, 685 ng_int64_parse, 686 ng_int64_unparse, 687 ng_int64_getDefault, 688 ng_int64_getAlign 689 }; 690 691 const struct ng_parse_type ng_parse_uint64_type = { 692 &ng_parse_int64_type, 693 (void *)INT_UNSIGNED 694 }; 695 696 const struct ng_parse_type ng_parse_hint64_type = { 697 &ng_parse_int64_type, 698 (void *)INT_HEX 699 }; 700 701 /************************************************************************ 702 STRING TYPE 703 ************************************************************************/ 704 705 static int 706 ng_string_parse(const struct ng_parse_type *type, 707 const char *s, int *off, const u_char *const start, 708 u_char *const buf, int *buflen) 709 { 710 char *sval; 711 int len; 712 713 if ((sval = ng_get_string_token(s, off, &len)) == NULL) 714 return (EINVAL); 715 *off += len; 716 len = strlen(sval) + 1; 717 bcopy(sval, buf, len); 718 FREE(sval, M_NETGRAPH); 719 *buflen = len; 720 return (0); 721 } 722 723 static int 724 ng_string_unparse(const struct ng_parse_type *type, 725 const u_char *data, int *off, char *cbuf, int cbuflen) 726 { 727 const char *const raw = (const char *)data + *off; 728 char *const s = ng_encode_string(raw); 729 730 if (s == NULL) 731 return (ENOMEM); 732 NG_PARSE_APPEND("%s", s); 733 *off += strlen(raw) + 1; 734 FREE(s, M_NETGRAPH); 735 return (0); 736 } 737 738 static int 739 ng_string_getDefault(const struct ng_parse_type *type, 740 const u_char *const start, u_char *buf, int *buflen) 741 { 742 743 if (*buflen < 1) 744 return (ERANGE); 745 buf[0] = (u_char)'\0'; 746 *buflen = 1; 747 return (0); 748 } 749 750 const struct ng_parse_type ng_parse_string_type = { 751 NULL, 752 NULL, 753 NULL, 754 ng_string_parse, 755 ng_string_unparse, 756 ng_string_getDefault, 757 NULL 758 }; 759 760 /************************************************************************ 761 FIXED BUFFER STRING TYPE 762 ************************************************************************/ 763 764 static int 765 ng_fixedstring_parse(const struct ng_parse_type *type, 766 const char *s, int *off, const u_char *const start, 767 u_char *const buf, int *buflen) 768 { 769 const struct ng_parse_fixedstring_info *const fi = type->info; 770 char *sval; 771 int len; 772 773 if ((sval = ng_get_string_token(s, off, &len)) == NULL) 774 return (EINVAL); 775 if (strlen(sval) + 1 > fi->bufSize) 776 return (E2BIG); 777 *off += len; 778 len = strlen(sval) + 1; 779 bcopy(sval, buf, len); 780 FREE(sval, M_NETGRAPH); 781 bzero(buf + len, fi->bufSize - len); 782 *buflen = fi->bufSize; 783 return (0); 784 } 785 786 static int 787 ng_fixedstring_unparse(const struct ng_parse_type *type, 788 const u_char *data, int *off, char *cbuf, int cbuflen) 789 { 790 const struct ng_parse_fixedstring_info *const fi = type->info; 791 int error, temp = *off; 792 793 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0) 794 return (error); 795 *off += fi->bufSize; 796 return (0); 797 } 798 799 static int 800 ng_fixedstring_getDefault(const struct ng_parse_type *type, 801 const u_char *const start, u_char *buf, int *buflen) 802 { 803 const struct ng_parse_fixedstring_info *const fi = type->info; 804 805 if (*buflen < fi->bufSize) 806 return (ERANGE); 807 bzero(buf, fi->bufSize); 808 *buflen = fi->bufSize; 809 return (0); 810 } 811 812 const struct ng_parse_type ng_parse_fixedstring_type = { 813 NULL, 814 NULL, 815 NULL, 816 ng_fixedstring_parse, 817 ng_fixedstring_unparse, 818 ng_fixedstring_getDefault, 819 NULL 820 }; 821 822 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = { 823 NG_NODELEN + 1 824 }; 825 const struct ng_parse_type ng_parse_nodebuf_type = { 826 &ng_parse_fixedstring_type, 827 &ng_parse_nodebuf_info 828 }; 829 830 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = { 831 NG_HOOKLEN + 1 832 }; 833 const struct ng_parse_type ng_parse_hookbuf_type = { 834 &ng_parse_fixedstring_type, 835 &ng_parse_hookbuf_info 836 }; 837 838 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = { 839 NG_PATHLEN + 1 840 }; 841 const struct ng_parse_type ng_parse_pathbuf_type = { 842 &ng_parse_fixedstring_type, 843 &ng_parse_pathbuf_info 844 }; 845 846 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = { 847 NG_TYPELEN + 1 848 }; 849 const struct ng_parse_type ng_parse_typebuf_type = { 850 &ng_parse_fixedstring_type, 851 &ng_parse_typebuf_info 852 }; 853 854 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = { 855 NG_CMDSTRLEN + 1 856 }; 857 const struct ng_parse_type ng_parse_cmdbuf_type = { 858 &ng_parse_fixedstring_type, 859 &ng_parse_cmdbuf_info 860 }; 861 862 /************************************************************************ 863 IP ADDRESS TYPE 864 ************************************************************************/ 865 866 static int 867 ng_ipaddr_parse(const struct ng_parse_type *type, 868 const char *s, int *off, const u_char *const start, 869 u_char *const buf, int *buflen) 870 { 871 int i, error; 872 873 for (i = 0; i < 4; i++) { 874 if ((error = ng_int8_parse(&ng_parse_int8_type, 875 s, off, start, buf + i, buflen)) != 0) 876 return (error); 877 if (i < 3 && s[*off] != '.') 878 return (EINVAL); 879 (*off)++; 880 } 881 *buflen = 4; 882 return (0); 883 } 884 885 static int 886 ng_ipaddr_unparse(const struct ng_parse_type *type, 887 const u_char *data, int *off, char *cbuf, int cbuflen) 888 { 889 struct in_addr ip; 890 891 bcopy(data + *off, &ip, sizeof(ip)); 892 NG_PARSE_APPEND("%d.%d.%d.%d", ((u_char *)&ip)[0], 893 ((u_char *)&ip)[1], ((u_char *)&ip)[2], ((u_char *)&ip)[3]); 894 *off += sizeof(ip); 895 return (0); 896 } 897 898 static int 899 ng_ipaddr_getDefault(const struct ng_parse_type *type, 900 const u_char *const start, u_char *buf, int *buflen) 901 { 902 struct in_addr ip = { 0 }; 903 904 if (*buflen < sizeof(ip)) 905 return (ERANGE); 906 bcopy(&ip, buf, sizeof(ip)); 907 *buflen = sizeof(ip); 908 return (0); 909 } 910 911 const struct ng_parse_type ng_parse_ipaddr_type = { 912 NULL, 913 NULL, 914 NULL, 915 ng_ipaddr_parse, 916 ng_ipaddr_unparse, 917 ng_ipaddr_getDefault, 918 ng_int32_getAlign 919 }; 920 921 /************************************************************************ 922 BYTE ARRAY TYPE 923 ************************************************************************/ 924 925 /* Get the length of a byte array */ 926 static int 927 ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type, 928 const u_char *start, const u_char *buf) 929 { 930 ng_parse_array_getLength_t *const getLength = type->private; 931 932 return (*getLength)(type, start, buf); 933 } 934 935 /* Byte array element type is hex int8 */ 936 static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = { 937 &ng_parse_hint8_type, 938 &ng_parse_bytearray_subtype_getLength, 939 NULL 940 }; 941 static const struct ng_parse_type ng_parse_bytearray_subtype = { 942 &ng_parse_array_type, 943 &ng_parse_bytearray_subtype_info 944 }; 945 946 static int 947 ng_bytearray_parse(const struct ng_parse_type *type, 948 const char *s, int *off, const u_char *const start, 949 u_char *const buf, int *buflen) 950 { 951 char *str; 952 int toklen; 953 954 /* We accept either an array of bytes or a string constant */ 955 if ((str = ng_get_string_token(s, off, &toklen)) != NULL) { 956 ng_parse_array_getLength_t *const getLength = type->info; 957 int arraylen, slen; 958 959 arraylen = (*getLength)(type, start, buf); 960 if (arraylen > *buflen) { 961 FREE(str, M_NETGRAPH); 962 return (ERANGE); 963 } 964 slen = strlen(str) + 1; 965 if (slen > arraylen) { 966 FREE(str, M_NETGRAPH); 967 return (E2BIG); 968 } 969 bcopy(str, buf, slen); 970 bzero(buf + slen, arraylen - slen); 971 FREE(str, M_NETGRAPH); 972 *off += toklen; 973 *buflen = arraylen; 974 return (0); 975 } else { 976 struct ng_parse_type subtype; 977 978 subtype = ng_parse_bytearray_subtype; 979 (const void *)subtype.private = type->info; 980 return ng_array_parse(&subtype, s, off, start, buf, buflen); 981 } 982 } 983 984 static int 985 ng_bytearray_unparse(const struct ng_parse_type *type, 986 const u_char *data, int *off, char *cbuf, int cbuflen) 987 { 988 struct ng_parse_type subtype; 989 990 subtype = ng_parse_bytearray_subtype; 991 (const void *)subtype.private = type->info; 992 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen); 993 } 994 995 static int 996 ng_bytearray_getDefault(const struct ng_parse_type *type, 997 const u_char *const start, u_char *buf, int *buflen) 998 { 999 struct ng_parse_type subtype; 1000 1001 subtype = ng_parse_bytearray_subtype; 1002 (const void *)subtype.private = type->info; 1003 return ng_array_getDefault(&subtype, start, buf, buflen); 1004 } 1005 1006 const struct ng_parse_type ng_parse_bytearray_type = { 1007 NULL, 1008 NULL, 1009 NULL, 1010 ng_bytearray_parse, 1011 ng_bytearray_unparse, 1012 ng_bytearray_getDefault, 1013 NULL 1014 }; 1015 1016 /************************************************************************ 1017 STRUCT NG_MESG TYPE 1018 ************************************************************************/ 1019 1020 /* Get msg->header.arglen when "buf" is pointing to msg->data */ 1021 static int 1022 ng_parse_ng_mesg_getLength(const struct ng_parse_type *type, 1023 const u_char *start, const u_char *buf) 1024 { 1025 const struct ng_mesg *msg; 1026 1027 msg = (const struct ng_mesg *)(buf - sizeof(*msg)); 1028 return msg->header.arglen; 1029 } 1030 1031 /* Type for the variable length data portion of a struct ng_mesg */ 1032 static const struct ng_parse_type ng_msg_data_type = { 1033 &ng_parse_bytearray_type, 1034 &ng_parse_ng_mesg_getLength 1035 }; 1036 1037 /* Type for the entire struct ng_mesg header with data section */ 1038 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[] 1039 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type); 1040 const struct ng_parse_type ng_parse_ng_mesg_type = { 1041 &ng_parse_struct_type, 1042 &ng_parse_ng_mesg_type_fields, 1043 }; 1044 1045 /************************************************************************ 1046 COMPOSITE HELPER ROUTINES 1047 ************************************************************************/ 1048 1049 /* 1050 * Convert a structure or array from ASCII to binary 1051 */ 1052 static int 1053 ng_parse_composite(const struct ng_parse_type *type, const char *s, 1054 int *off, const u_char *const start, u_char *const buf, int *buflen, 1055 const enum comptype ctype) 1056 { 1057 const int num = ng_get_composite_len(type, start, buf, ctype); 1058 int nextIndex = 0; /* next implicit array index */ 1059 u_int index; /* field or element index */ 1060 int *foff; /* field value offsets in string */ 1061 int align, len, blen, error = 0; 1062 1063 /* Initialize */ 1064 MALLOC(foff, int *, num * sizeof(*foff), M_NETGRAPH, M_NOWAIT); 1065 if (foff == NULL) { 1066 error = ENOMEM; 1067 goto done; 1068 } 1069 bzero(foff, num * sizeof(*foff)); 1070 1071 /* Get opening brace/bracket */ 1072 if (ng_parse_get_token(s, off, &len) 1073 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) { 1074 error = EINVAL; 1075 goto done; 1076 } 1077 *off += len; 1078 1079 /* Get individual element value positions in the string */ 1080 for (;;) { 1081 enum ng_parse_token tok; 1082 1083 /* Check for closing brace/bracket */ 1084 tok = ng_parse_get_token(s, off, &len); 1085 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) { 1086 *off += len; 1087 break; 1088 } 1089 1090 /* For arrays, the 'name' (ie, index) is optional, so 1091 distinguish name from values by seeing if the next 1092 token is an equals sign */ 1093 if (ctype != CT_STRUCT) { 1094 int len2, off2; 1095 char *eptr; 1096 1097 /* If an opening brace/bracket, index is implied */ 1098 if (tok == T_LBRACE || tok == T_LBRACKET) { 1099 index = nextIndex++; 1100 goto gotIndex; 1101 } 1102 1103 /* Might be an index, might be a value, either way... */ 1104 if (tok != T_WORD) { 1105 error = EINVAL; 1106 goto done; 1107 } 1108 1109 /* If no equals sign follows, index is implied */ 1110 off2 = *off + len; 1111 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) { 1112 index = nextIndex++; 1113 goto gotIndex; 1114 } 1115 1116 /* Index was specified explicitly; parse it */ 1117 index = (u_int)strtoul(s + *off, &eptr, 0); 1118 if (index < 0 || eptr - (s + *off) != len) { 1119 error = EINVAL; 1120 goto done; 1121 } 1122 nextIndex = index + 1; 1123 *off += len + len2; 1124 gotIndex: 1125 ; /* avoid gcc3.x warning */ 1126 } else { /* a structure field */ 1127 const struct ng_parse_struct_field *const 1128 fields = type->info; 1129 1130 /* Find the field by name (required) in field list */ 1131 if (tok != T_WORD) { 1132 error = EINVAL; 1133 goto done; 1134 } 1135 for (index = 0; index < num; index++) { 1136 const struct ng_parse_struct_field *const 1137 field = &fields[index]; 1138 1139 if (strncmp(&s[*off], field->name, len) == 0 1140 && field->name[len] == '\0') 1141 break; 1142 } 1143 if (index == num) { 1144 error = ENOENT; 1145 goto done; 1146 } 1147 *off += len; 1148 1149 /* Get equals sign */ 1150 if (ng_parse_get_token(s, off, &len) != T_EQUALS) { 1151 error = EINVAL; 1152 goto done; 1153 } 1154 *off += len; 1155 } 1156 1157 /* Check array index */ 1158 if (index >= num) { 1159 error = E2BIG; 1160 goto done; 1161 } 1162 1163 /* Save value's position and skip over it for now */ 1164 if (foff[index] != 0) { 1165 error = EALREADY; /* duplicate */ 1166 goto done; 1167 } 1168 while (isspace(s[*off])) 1169 (*off)++; 1170 foff[index] = *off; 1171 if ((error = ng_parse_skip_value(s, *off, &len)) != 0) 1172 goto done; 1173 *off += len; 1174 } 1175 1176 /* Now build binary structure from supplied values and defaults */ 1177 for (blen = index = 0; index < num; index++) { 1178 const struct ng_parse_type *const 1179 etype = ng_get_composite_etype(type, index, ctype); 1180 int k, pad, vlen; 1181 1182 /* Zero-pad any alignment bytes */ 1183 pad = ng_parse_get_elem_pad(type, index, ctype, blen); 1184 for (k = 0; k < pad; k++) { 1185 if (blen >= *buflen) { 1186 error = ERANGE; 1187 goto done; 1188 } 1189 buf[blen++] = 0; 1190 } 1191 1192 /* Get value */ 1193 vlen = *buflen - blen; 1194 if (foff[index] == 0) { /* use default value */ 1195 error = ng_get_composite_elem_default(type, index, 1196 start, buf + blen, &vlen, ctype); 1197 } else { /* parse given value */ 1198 *off = foff[index]; 1199 error = INVOKE(etype, parse)(etype, 1200 s, off, start, buf + blen, &vlen); 1201 } 1202 if (error != 0) 1203 goto done; 1204 blen += vlen; 1205 } 1206 1207 /* Make total composite structure size a multiple of its alignment */ 1208 if ((align = ALIGNMENT(type)) != 0) { 1209 while (blen % align != 0) { 1210 if (blen >= *buflen) { 1211 error = ERANGE; 1212 goto done; 1213 } 1214 buf[blen++] = 0; 1215 } 1216 } 1217 1218 /* Done */ 1219 *buflen = blen; 1220 done: 1221 if (foff != NULL) 1222 FREE(foff, M_NETGRAPH); 1223 return (error); 1224 } 1225 1226 /* 1227 * Convert an array or structure from binary to ASCII 1228 */ 1229 static int 1230 ng_unparse_composite(const struct ng_parse_type *type, const u_char *data, 1231 int *off, char *cbuf, int cbuflen, const enum comptype ctype) 1232 { 1233 const struct ng_mesg *const hdr 1234 = (const struct ng_mesg *)(data - sizeof(*hdr)); 1235 const int num = ng_get_composite_len(type, data, data + *off, ctype); 1236 const int workSize = 20 * 1024; /* XXX hard coded constant */ 1237 int nextIndex = 0, didOne = 0; 1238 int error, index; 1239 u_char *workBuf; 1240 1241 /* Get workspace for checking default values */ 1242 MALLOC(workBuf, u_char *, workSize, M_NETGRAPH, M_NOWAIT); 1243 if (workBuf == NULL) 1244 return (ENOMEM); 1245 1246 /* Opening brace/bracket */ 1247 NG_PARSE_APPEND("%c", (ctype == CT_STRUCT) ? '{' : '['); 1248 1249 /* Do each item */ 1250 for (index = 0; index < num; index++) { 1251 const struct ng_parse_type *const 1252 etype = ng_get_composite_etype(type, index, ctype); 1253 1254 /* Skip any alignment pad bytes */ 1255 *off += ng_parse_get_elem_pad(type, index, ctype, *off); 1256 1257 /* 1258 * See if element is equal to its default value; skip if so. 1259 * Copy struct ng_mesg header for types that peek into it. 1260 */ 1261 if (sizeof(*hdr) + *off < workSize) { 1262 int tempsize = workSize - sizeof(*hdr) - *off; 1263 1264 bcopy(hdr, workBuf, sizeof(*hdr) + *off); 1265 if (ng_get_composite_elem_default(type, index, workBuf 1266 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off, 1267 &tempsize, ctype) == 0 1268 && bcmp(workBuf + sizeof(*hdr) + *off, 1269 data + *off, tempsize) == 0) { 1270 *off += tempsize; 1271 continue; 1272 } 1273 } 1274 1275 /* Print name= */ 1276 NG_PARSE_APPEND(" "); 1277 if (ctype != CT_STRUCT) { 1278 if (index != nextIndex) { 1279 nextIndex = index; 1280 NG_PARSE_APPEND("%d=", index); 1281 } 1282 nextIndex++; 1283 } else { 1284 const struct ng_parse_struct_field *const 1285 fields = type->info; 1286 1287 NG_PARSE_APPEND("%s=", fields[index].name); 1288 } 1289 1290 /* Print value */ 1291 if ((error = INVOKE(etype, unparse) 1292 (etype, data, off, cbuf, cbuflen)) != 0) { 1293 FREE(workBuf, M_NETGRAPH); 1294 return (error); 1295 } 1296 cbuflen -= strlen(cbuf); 1297 cbuf += strlen(cbuf); 1298 didOne = 1; 1299 } 1300 FREE(workBuf, M_NETGRAPH); 1301 1302 /* Closing brace/bracket */ 1303 NG_PARSE_APPEND("%s%c", 1304 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']'); 1305 return (0); 1306 } 1307 1308 /* 1309 * Generate the default value for an element of an array or structure 1310 * Returns EOPNOTSUPP if default value is unspecified. 1311 */ 1312 static int 1313 ng_get_composite_elem_default(const struct ng_parse_type *type, 1314 int index, const u_char *const start, u_char *buf, int *buflen, 1315 const enum comptype ctype) 1316 { 1317 const struct ng_parse_type *etype; 1318 ng_getDefault_t *func; 1319 1320 switch (ctype) { 1321 case CT_STRUCT: 1322 break; 1323 case CT_ARRAY: 1324 { 1325 const struct ng_parse_array_info *const ai = type->info; 1326 1327 if (ai->getDefault != NULL) { 1328 return (*ai->getDefault)(type, 1329 index, start, buf, buflen); 1330 } 1331 break; 1332 } 1333 case CT_FIXEDARRAY: 1334 { 1335 const struct ng_parse_fixedarray_info *const fi = type->info; 1336 1337 if (*fi->getDefault != NULL) { 1338 return (*fi->getDefault)(type, 1339 index, start, buf, buflen); 1340 } 1341 break; 1342 } 1343 default: 1344 panic("%s", __FUNCTION__); 1345 } 1346 1347 /* Default to element type default */ 1348 etype = ng_get_composite_etype(type, index, ctype); 1349 func = METHOD(etype, getDefault); 1350 if (func == NULL) 1351 return (EOPNOTSUPP); 1352 return (*func)(etype, start, buf, buflen); 1353 } 1354 1355 /* 1356 * Get the number of elements in a struct, variable or fixed array. 1357 */ 1358 static int 1359 ng_get_composite_len(const struct ng_parse_type *type, 1360 const u_char *const start, const u_char *buf, 1361 const enum comptype ctype) 1362 { 1363 switch (ctype) { 1364 case CT_STRUCT: 1365 { 1366 const struct ng_parse_struct_field *const fields = type->info; 1367 int numFields = 0; 1368 1369 for (numFields = 0; ; numFields++) { 1370 const struct ng_parse_struct_field *const 1371 fi = &fields[numFields]; 1372 1373 if (fi->name == NULL) 1374 break; 1375 } 1376 return (numFields); 1377 } 1378 case CT_ARRAY: 1379 { 1380 const struct ng_parse_array_info *const ai = type->info; 1381 1382 return (*ai->getLength)(type, start, buf); 1383 } 1384 case CT_FIXEDARRAY: 1385 { 1386 const struct ng_parse_fixedarray_info *const fi = type->info; 1387 1388 return fi->length; 1389 } 1390 default: 1391 panic("%s", __FUNCTION__); 1392 } 1393 return (0); 1394 } 1395 1396 /* 1397 * Return the type of the index'th element of a composite structure 1398 */ 1399 static const struct ng_parse_type * 1400 ng_get_composite_etype(const struct ng_parse_type *type, 1401 int index, const enum comptype ctype) 1402 { 1403 const struct ng_parse_type *etype = NULL; 1404 1405 switch (ctype) { 1406 case CT_STRUCT: 1407 { 1408 const struct ng_parse_struct_field *const fields = type->info; 1409 1410 etype = fields[index].type; 1411 break; 1412 } 1413 case CT_ARRAY: 1414 { 1415 const struct ng_parse_array_info *const ai = type->info; 1416 1417 etype = ai->elementType; 1418 break; 1419 } 1420 case CT_FIXEDARRAY: 1421 { 1422 const struct ng_parse_fixedarray_info *const fi = type->info; 1423 1424 etype = fi->elementType; 1425 break; 1426 } 1427 default: 1428 panic("%s", __FUNCTION__); 1429 } 1430 return (etype); 1431 } 1432 1433 /* 1434 * Get the number of bytes to skip to align for the next 1435 * element in a composite structure. 1436 */ 1437 static int 1438 ng_parse_get_elem_pad(const struct ng_parse_type *type, 1439 int index, enum comptype ctype, int posn) 1440 { 1441 const struct ng_parse_type *const 1442 etype = ng_get_composite_etype(type, index, ctype); 1443 int align; 1444 1445 /* Get element's alignment, and possibly override */ 1446 align = ALIGNMENT(etype); 1447 if (ctype == CT_STRUCT) { 1448 const struct ng_parse_struct_field *const fields = type->info; 1449 1450 if (fields[index].alignment != 0) 1451 align = fields[index].alignment; 1452 } 1453 1454 /* Return number of bytes to skip to align */ 1455 return (align ? (align - (posn % align)) % align : 0); 1456 } 1457 1458 /************************************************************************ 1459 PARSING HELPER ROUTINES 1460 ************************************************************************/ 1461 1462 /* 1463 * Skip over a value 1464 */ 1465 static int 1466 ng_parse_skip_value(const char *s, int off0, int *lenp) 1467 { 1468 int len, nbracket, nbrace; 1469 int off = off0; 1470 1471 len = nbracket = nbrace = 0; 1472 do { 1473 switch (ng_parse_get_token(s, &off, &len)) { 1474 case T_LBRACKET: 1475 nbracket++; 1476 break; 1477 case T_LBRACE: 1478 nbrace++; 1479 break; 1480 case T_RBRACKET: 1481 if (nbracket-- == 0) 1482 return (EINVAL); 1483 break; 1484 case T_RBRACE: 1485 if (nbrace-- == 0) 1486 return (EINVAL); 1487 break; 1488 case T_EOF: 1489 return (EINVAL); 1490 default: 1491 break; 1492 } 1493 off += len; 1494 } while (nbracket > 0 || nbrace > 0); 1495 *lenp = off - off0; 1496 return (0); 1497 } 1498 1499 /* 1500 * Find the next token in the string, starting at offset *startp. 1501 * Returns the token type, with *startp pointing to the first char 1502 * and *lenp the length. 1503 */ 1504 enum ng_parse_token 1505 ng_parse_get_token(const char *s, int *startp, int *lenp) 1506 { 1507 char *t; 1508 int i; 1509 1510 while (isspace(s[*startp])) 1511 (*startp)++; 1512 switch (s[*startp]) { 1513 case '\0': 1514 *lenp = 0; 1515 return T_EOF; 1516 case '{': 1517 *lenp = 1; 1518 return T_LBRACE; 1519 case '}': 1520 *lenp = 1; 1521 return T_RBRACE; 1522 case '[': 1523 *lenp = 1; 1524 return T_LBRACKET; 1525 case ']': 1526 *lenp = 1; 1527 return T_RBRACKET; 1528 case '=': 1529 *lenp = 1; 1530 return T_EQUALS; 1531 case '"': 1532 if ((t = ng_get_string_token(s, startp, lenp)) == NULL) 1533 return T_ERROR; 1534 FREE(t, M_NETGRAPH); 1535 return T_STRING; 1536 default: 1537 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i]) 1538 && s[i] != '{' && s[i] != '}' && s[i] != '[' 1539 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++) 1540 ; 1541 *lenp = i - *startp; 1542 return T_WORD; 1543 } 1544 } 1545 1546 /* 1547 * Get a string token, which must be enclosed in double quotes. 1548 * The normal C backslash escapes are recognized. 1549 */ 1550 char * 1551 ng_get_string_token(const char *s, int *startp, int *lenp) 1552 { 1553 char *cbuf, *p; 1554 int start, off; 1555 1556 while (isspace(s[*startp])) 1557 (*startp)++; 1558 start = *startp; 1559 if (s[*startp] != '"') 1560 return (NULL); 1561 MALLOC(cbuf, char *, strlen(s + start), M_NETGRAPH, M_NOWAIT); 1562 if (cbuf == NULL) 1563 return (NULL); 1564 strcpy(cbuf, s + start + 1); 1565 for (off = 1, p = cbuf; *p != '\0'; off++, p++) { 1566 if (*p == '"') { 1567 *p = '\0'; 1568 *lenp = off + 1; 1569 return (cbuf); 1570 } else if (p[0] == '\\' && p[1] != '\0') { 1571 int x, k; 1572 char *v; 1573 1574 strcpy(p, p + 1); 1575 v = p; 1576 switch (*p) { 1577 case 't': 1578 *v = '\t'; 1579 off++; 1580 continue; 1581 case 'n': 1582 *v = '\n'; 1583 off++; 1584 continue; 1585 case 'r': 1586 *v = '\r'; 1587 off++; 1588 continue; 1589 case 'v': 1590 *v = '\v'; 1591 off++; 1592 continue; 1593 case 'f': 1594 *v = '\f'; 1595 off++; 1596 continue; 1597 case '"': 1598 *v = '"'; 1599 off++; 1600 continue; 1601 case '0': case '1': case '2': case '3': 1602 case '4': case '5': case '6': case '7': 1603 for (x = k = 0; 1604 k < 3 && *v >= '0' && *v <= '7'; v++) { 1605 x = (x << 3) + (*v - '0'); 1606 off++; 1607 } 1608 *--v = (char)x; 1609 break; 1610 case 'x': 1611 for (v++, x = k = 0; 1612 k < 2 && isxdigit(*v); v++) { 1613 x = (x << 4) + (isdigit(*v) ? 1614 (*v - '0') : 1615 (tolower(*v) - 'a' + 10)); 1616 off++; 1617 } 1618 *--v = (char)x; 1619 break; 1620 default: 1621 continue; 1622 } 1623 strcpy(p, v); 1624 } 1625 } 1626 return (NULL); /* no closing quote */ 1627 } 1628 1629 /* 1630 * Encode a string so it can be safely put in double quotes. 1631 * Caller must free the result. 1632 */ 1633 char * 1634 ng_encode_string(const char *raw) 1635 { 1636 char *cbuf; 1637 int off = 0; 1638 1639 MALLOC(cbuf, char *, strlen(raw) * 4 + 3, M_NETGRAPH, M_NOWAIT); 1640 if (cbuf == NULL) 1641 return (NULL); 1642 cbuf[off++] = '"'; 1643 for ( ; *raw != '\0'; raw++) { 1644 switch (*raw) { 1645 case '\t': 1646 cbuf[off++] = '\\'; 1647 cbuf[off++] = 't'; 1648 break; 1649 case '\f': 1650 cbuf[off++] = '\\'; 1651 cbuf[off++] = 'f'; 1652 break; 1653 case '\n': 1654 cbuf[off++] = '\\'; 1655 cbuf[off++] = 'n'; 1656 break; 1657 case '\r': 1658 cbuf[off++] = '\\'; 1659 cbuf[off++] = 'r'; 1660 break; 1661 case '\v': 1662 cbuf[off++] = '\\'; 1663 cbuf[off++] = 'v'; 1664 break; 1665 case '"': 1666 case '\\': 1667 cbuf[off++] = '\\'; 1668 cbuf[off++] = *raw; 1669 break; 1670 default: 1671 if (*raw < 0x20 || *raw > 0x7e) { 1672 off += sprintf(cbuf + off, 1673 "\\x%02x", (u_char)*raw); 1674 break; 1675 } 1676 cbuf[off++] = *raw; 1677 break; 1678 } 1679 } 1680 cbuf[off++] = '"'; 1681 cbuf[off] = '\0'; 1682 return (cbuf); 1683 } 1684 1685 /************************************************************************ 1686 VIRTUAL METHOD LOOKUP 1687 ************************************************************************/ 1688 1689 static ng_parse_t * 1690 ng_get_parse_method(const struct ng_parse_type *t) 1691 { 1692 while (t != NULL && t->parse == NULL) 1693 t = t->supertype; 1694 return (t ? t->parse : NULL); 1695 } 1696 1697 static ng_unparse_t * 1698 ng_get_unparse_method(const struct ng_parse_type *t) 1699 { 1700 while (t != NULL && t->unparse == NULL) 1701 t = t->supertype; 1702 return (t ? t->unparse : NULL); 1703 } 1704 1705 static ng_getDefault_t * 1706 ng_get_getDefault_method(const struct ng_parse_type *t) 1707 { 1708 while (t != NULL && t->getDefault == NULL) 1709 t = t->supertype; 1710 return (t ? t->getDefault : NULL); 1711 } 1712 1713 static ng_getAlign_t * 1714 ng_get_getAlign_method(const struct ng_parse_type *t) 1715 { 1716 while (t != NULL && t->getAlign == NULL) 1717 t = t->supertype; 1718 return (t ? t->getAlign : NULL); 1719 } 1720 1721